/* ===== FONT DISPLAY SWAP — override FA default (block) ===== */
@font-face { font-family: "Font Awesome 6 Free"; font-style: normal; font-weight: 400; font-display: swap; src: local("Font Awesome 6 Free Regular"); }
@font-face { font-family: "Font Awesome 6 Free"; font-style: normal; font-weight: 900; font-display: swap; src: local("Font Awesome 6 Free Solid"); }
@font-face { font-family: "Font Awesome 6 Brands"; font-style: normal; font-weight: 400; font-display: swap; src: local("Font Awesome 6 Brands Regular"); }

/* ===== RESET ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* ===== LIGHT PAGE THEME ===== */
:root {
  --bg:          #f7f8fa;
  --bg2:         #ffffff;
  --bg3:         #e8edf4;
  --card:        #ffffff;
  --card-hover:  #f5f8ff;
  --accent:      #4f46e5;
  --accent2:     #6366f1;
  --text:        #111827;
  --text-muted:  #374151;
  --border:      #dde3ec;
  --radius:      10px;
  --ease:        0.16s ease;
}

html { scroll-behavior: smooth; font-size: 17px; }
body { font-family: 'Noto Sans', 'Segoe UI', system-ui, sans-serif; background: var(--bg); color: var(--text); min-height: 100vh; overflow-x: hidden; display: flex; flex-direction: column; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button { cursor: pointer; border: none; background: none; font: inherit; color: inherit; }
/* Global paragraph size — excludes interactive tool/calc widgets */
p { font-size: 1.05rem; line-height: 1.78; }
.calc-col p,
.frac-page p, .pct-page p, .uc-page p, .geo-page p,
.graph-page p, .prime-page p, .glcm-page p, .ratio-page p,
.stats-page p, .exp-page p, .roman-page p, .tt-page p,
.eq-page p, .tri-page p, .base-page p { font-size: inherit; line-height: inherit; }
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(79,70,229,0.25); border-radius: 4px; }

/* ===== CONTAINER ===== */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 40px;
}

/* ===== HEADER ===== */
header {
  position: sticky; top: 0; z-index: 200;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  height: 52px;
  width: 100%;
}
.header-inner {
  width: 100%; max-width: 1200px;
  margin: 0 auto;
  padding: 0 40px; height: 100%;
  display: flex; align-items: center; gap: 20px;
}
.logo {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 1.5rem; font-weight: 700;
  color: var(--text); letter-spacing: 0.4px; white-space: nowrap;
}
.logo-solve { color: var(--text); }
.logo-calc  { color: #F29C1E; }
.logo-img { width: 28px; height: 28px; object-fit: contain; display: block; }
.site-tagline { display: none; }
.header-nav { margin-left: auto; display: flex; gap: 2px; }
.header-nav a {
  padding: 6px 14px; border-radius: 8px;
  font-size: 0.75rem; font-weight: 700;
  color: var(--text-muted); transition: color var(--ease), background var(--ease);
  text-transform: uppercase; letter-spacing: 0.6px;
}
.header-nav a:hover { color: var(--accent); }
.header-nav a.active { color: var(--accent); background: none; font-weight: 800; }
.mob-menu-btn { display: none; align-items: center; justify-content: center; width: 36px; height: 36px; color: var(--text-muted); margin-left: auto; }

.mob-nav {
  display: none; flex-direction: column; gap: 2px;
  position: fixed; top: 52px; left: 0; right: 0;
  background: #fff; border-bottom: 1px solid var(--border);
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
  padding: 12px; z-index: 195;
}
.mob-nav.open { display: flex; }
.mob-nav a { padding: 11px 16px; border-radius: var(--radius); font-weight: 700; color: var(--text-muted); transition: color var(--ease), background var(--ease); }
.mob-nav a:hover { background: rgba(79,70,229,0.07); color: var(--accent); }
.mob-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.2); z-index: 194; }
.mob-overlay.active { display: block; }

/* ===== PAGE WRAP ===== */
.page-wrap { max-width: 1200px; width: 100%; margin: 0 auto; padding: 40px 40px 40px; flex: 1; }

/* ===== HOME HERO ===== */
.home-hero { text-align: center; padding: 0 0 40px; max-width: 860px; margin: 0 auto; }
.home-hero-title { font-size: 1.75rem; font-weight: 800; color: var(--text); line-height: 1.25; letter-spacing: -0.4px; margin-bottom: 14px; }
.home-hero-desc { font-size: 1.05rem; color: var(--text-muted); line-height: 1.75; font-weight: 400; max-width: 100%; margin: 0 auto; }

/* ===== HOME LAYOUT — centered ===== */
.home-layout { display: flex; flex-direction: column; align-items: center; gap: 64px; }
.calc-col { width: 100%; max-width: 420px; }
.content-col { width: 100%; max-width: 740px; }

/* ===== DEVICE FRAME — calculator body style ===== */
.device-frame {
  position: relative;
  background: #1a1a1a;
  border-radius: 20px;
  padding: 12px;
  box-shadow:
    0 0 0 1px rgba(255,255,255,0.06),
    0 18px 48px rgba(0,0,0,0.5),
    inset 0 1px 0 rgba(255,255,255,0.05);
}
/* No phone side buttons */
.device-frame::before,
.device-frame::after { display: none; }

/* ===== iOS CALCULATOR ===== */
.calc-widget {
  background: #000;
  border-radius: 12px;
  overflow: hidden;
  padding: 0 14px 16px;
}

/* Header */
.calc-header {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding: 14px 4px 8px;
  min-height: 46px;
  background: transparent;
  box-sizing: border-box;
}
.calc-title {
  font-size: 0.75rem; font-weight: 700;
  color: rgba(255,255,255,0.45);
  letter-spacing: 0.6px; text-transform: uppercase;
}

/* Display — huge thin number */
.calc-display-wrap {
  padding: 8px 14px 22px;
  min-height: 130px;
  display: flex; flex-direction: column; justify-content: flex-end; align-items: flex-end;
}
.calc-expr {
  font-size: 0.82rem;
  color: rgba(255,255,255,0.3);
  min-height: 18px; word-break: break-all; text-align: right;
  padding-right: 2px;
  font-family: -apple-system, system-ui, sans-serif;
}
.calc-display {
  font-family: -apple-system, 'SF Pro Display', 'Noto Sans', system-ui, sans-serif;
  font-size: 5rem; font-weight: 200;
  color: #fff; text-align: right;
  line-height: 1; letter-spacing: -4px;
  word-break: break-all;
}
.calc-display.shake { animation: shake 0.4s ease; }
@keyframes shake {
  0%,100% { transform: translateX(0); }
  25%     { transform: translateX(-6px); }
  75%     { transform: translateX(6px); }
}

/* Button grid */
.calc-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
}

/* Base button — dark gray circles */
.cbtn {
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  font-size: 1.15rem; font-weight: 400;
  color: #fff;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  transition: filter 0.12s ease, transform 0.07s ease;
  background: #3a3a3c;
}
.cbtn:hover { filter: brightness(1.22); }
.cbtn:active { transform: scale(0.91); filter: brightness(0.78); }

/* Scientific fn keys — slightly darker, smaller text */
.cbtn-fn {
  background: #2c2c2e;
  font-size: 0.7rem; font-weight: 600;
  color: rgba(255,255,255,0.82);
  letter-spacing: 0.2px;
}

/* AC / ⌫ / paren / % — medium gray */
.cbtn-cl {
  background: #8e8e93;
  color: #000;
  font-size: 1rem; font-weight: 600;
}

/* Operators — iOS orange */
.cbtn-op {
  background: #ff9500;
  color: #fff;
  font-size: 1.35rem; font-weight: 300;
}

/* Numbers */
.cbtn-num {
  background: #3a3a3c;
  color: #fff;
  font-size: 1.3rem; font-weight: 400;
}

/* Equals */
.cbtn-eq {
  background: #ff9500;
  color: #fff;
  font-size: 1.5rem; font-weight: 300;
}

/* 0 key — wide pill, centered text */
.cbtn-wide2 {
  aspect-ratio: unset;
  border-radius: 999px;
  grid-column: span 2;
  padding: 0;
  justify-content: center;
  background: #3a3a3c;
}

/* = spans full row */
.cbtn-wide5 {
  aspect-ratio: unset;
  border-radius: 999px;
  grid-column: span 5;
  height: 54px;
}

/* ===== CODE MODE TOGGLE (in calc header) ===== */
.code-toggle-wrap {
  display: inline-flex; align-items: center; gap: 6px;
  cursor: pointer; user-select: none;
}
.code-toggle-input { position: absolute; opacity: 0; width: 0; height: 0; }
.code-toggle-track {
  display: inline-block; width: 30px; height: 17px;
  background: #3a3a3c; border-radius: 999px; position: relative;
  transition: background 0.2s;
  flex-shrink: 0;
}
.code-toggle-thumb {
  position: absolute; top: 2px; left: 2px;
  width: 13px; height: 13px;
  background: #8e8e93; border-radius: 50%;
  transition: transform 0.2s, background 0.2s;
  box-shadow: 0 1px 3px rgba(0,0,0,0.4);
}
.code-toggle-input:checked + .code-toggle-track { background: #636366; }
.code-toggle-input:checked + .code-toggle-track .code-toggle-thumb {
  transform: translateX(13px); background: #fff;
}
.code-toggle-label {
  font-size: 0.65rem; font-weight: 600; color: rgba(255,255,255,0.4);
  text-transform: uppercase; letter-spacing: 0.7px;
}
.code-toggle-input:checked ~ .code-toggle-label { color: rgba(255,255,255,0.75); }

/* ===== RELATED ARTICLES ===== */
.about-topics-block {
  background: #fff;
  width: 100vw;
  position: relative;
  left: 50%;
  transform: translateX(-50%);
  padding: 1.8rem 2rem 1.6rem;
  margin-bottom: 0;
  border: none;
  border-radius: 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.about-topics-block-inner {
  max-width: 740px;
  margin: 0 auto;
}
.about-topics-block .intro { text-align: left; margin-bottom: 0; }
.tools-full-row {
  background: #fff;
  width: 100vw;
  position: relative;
  left: 50%;
  transform: translateX(-50%);
  padding: 48px 2rem;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  margin-bottom: 0;
}
.tools-full-row .home-section {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0;
}
/* 50/50 split: mascot (sticky) + tools grid */
.tools-split-layout {
  display: flex;
  gap: 2.5rem;
  align-items: flex-start;
}
.tools-mascot-col {
  flex: 0 0 46%;
  position: sticky;
  top: 72px;
  display: flex;
  align-items: flex-end;
  justify-content: center;
}
.tools-mascot-img {
  width: 100%;
  max-width: 100%;
  height: auto;
  display: block;
  object-fit: contain;
  object-position: bottom center;
}
.tools-grid-col {
  flex: 1 1 0;
  min-width: 0;
}
.tools-grid-col .home-tools-grid {
  grid-template-columns: repeat(2, 1fr);
}
/* Desktop shows desktop image, hides mobile image */
.tools-mascot-mobile { display: none; }
.tools-mascot-desktop { display: block; }

@media (max-width: 768px) {
  .tools-split-layout { flex-direction: column; }
  .tools-mascot-col { flex: none; position: static; width: 100%; max-width: 280px; margin: 0 auto; }
  .tools-grid-col .home-tools-grid { grid-template-columns: repeat(2, 1fr); }
  /* Swap images on mobile */
  .tools-mascot-desktop { display: none; }
  .tools-mascot-mobile { display: block; }
}
.about-topics-block h1 { text-align: left; margin-bottom: .5rem; }
.related-articles { margin-top: 36px; }
.ra-title { font-size: 0.78rem; font-weight: 800; text-transform: uppercase; letter-spacing: 1px; color: var(--text-muted); margin-bottom: 10px; }
.ra-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.ra-card {
  display: flex; align-items: center; justify-content: center;
  padding: 12px 10px; border-radius: var(--radius);
  font-size: 0.82rem; font-weight: 800; color: #fff;
  text-align: center; line-height: 1.3;
  min-height: 52px;
  transition: opacity var(--ease), transform var(--ease);
  box-shadow: 0 2px 6px rgba(0,0,0,0.10);
}
.ra-card:hover { opacity: 0.88; transform: translateY(-1px); }
.ra-card:nth-child(1) { background: #f97316; }
.ra-card:nth-child(2) { background: #10b981; }
.ra-card:nth-child(3) { background: #eab308; color: #1a202c; }
.ra-card:nth-child(4) { background: #ef4444; }
.ra-card:nth-child(5) { background: #6366f1; }
.ra-card:nth-child(6) { background: #14b8a6; }
.ra-card { gap: 7px; }
.ra-card-icon { font-size: 0.85em; opacity: 0.88; flex-shrink: 0; }

/* ===== ACCESSIBILITY WIDGET ===== */
.a11y-wrap { position: relative; }
.mob-a11y-row {
  display: flex; align-items: center; justify-content: space-between;
  padding: .75rem 1.2rem;
  border-top: 1px solid var(--border);
  margin-top: .25rem;
}
.mob-a11y-label {
  font-size: .85rem; font-weight: 700; color: var(--text-muted);
  display: flex; align-items: center; gap: .45rem;
}
.a11y-toggle-btn {
  display: flex; align-items: center; justify-content: center;
  width: 36px; height: 36px;
  border-radius: 50%;
  background: transparent;
  border: 1.5px solid var(--border);
  color: var(--text-muted);
  cursor: pointer;
  transition: background .15s, color .15s, border-color .15s;
}
.a11y-toggle-btn:hover { background: var(--card-hover); color: var(--text); border-color: var(--accent); }
.a11y-t-icon {
  font-family: 'Noto Sans', sans-serif;
  font-size: 1.1rem;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.5px;
}
.a11y-panel {
  display: none;
  position: absolute; top: calc(100% + 10px); right: 0;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem 1.1rem;
  min-width: 210px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.13);
  z-index: 999;
  flex-direction: column; gap: 14px;
}
.a11y-panel.a11y-panel-open { display: flex; }
.a11y-row { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.a11y-label { font-size: 0.8rem; font-weight: 700; color: var(--text-muted); white-space: nowrap; }
.a11y-size-btns { display: flex; gap: 5px; }
.a11y-sz-btn {
  width: 32px; height: 32px;
  border-radius: 8px;
  border: 1.5px solid var(--border);
  background: transparent; color: var(--text);
  font-size: 0.8rem; font-weight: 700;
  cursor: pointer; transition: background .15s, border-color .15s;
}
.a11y-sz-btn:hover { background: var(--card-hover); border-color: var(--accent); }
.a11y-sz-reset { font-size: 0.95rem; }
/* ===== HOME ARTICLE ===== */
.home-article h1 { font-size: 1.75rem; font-weight: 800; color: var(--text); line-height: 1.25; letter-spacing: -0.4px; margin-bottom: 12px; text-align: center; }
.home-article .intro { font-size: 1rem; color: var(--text-muted); line-height: 1.8; margin-bottom: 28px; text-align: center; }
.home-article h2 { font-size: 1.2rem; font-weight: 700; color: var(--text); margin: 40px 0 14px; }
.home-article p { font-size: 1rem; color: var(--text-muted); line-height: 1.85; margin-bottom: 16px; }
.home-article ul { padding-left: 20px; color: var(--text-muted); font-size: 1rem; line-height: 1.85; margin-bottom: 22px; }
.home-article li { margin-bottom: 8px; }
.home-article strong { color: var(--text); font-weight: 600; }
.home-article code { font-family: 'JetBrains Mono', monospace; background: #eef1f7; padding: 1px 7px; border-radius: 4px; font-size: 0.9em; color: var(--accent); }

.use-cases { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin: 20px 0 32px; }
.use-case {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 16px; box-shadow: 0 1px 4px rgba(0,0,0,0.04);
  transition: box-shadow var(--ease), transform var(--ease);
}
.use-case:hover { box-shadow: 0 4px 14px rgba(79,70,229,0.1); transform: translateY(-1px); }
.use-case strong { display: block; font-size: 0.95rem; font-weight: 800; color: var(--text); margin-bottom: 6px; }
.use-case p { font-size: 0.88rem; color: var(--text-muted); line-height: 1.7; margin: 0; }

/* ===== ARTICLE PAGES ===== */
.inner-page { max-width: 780px; margin: 0 auto; padding-top: 8px; width: 100%; box-sizing: border-box; overflow-wrap: break-word; }
.inner-page h1 { font-size: 2rem; font-weight: 700; color: var(--text); line-height: 1.2; letter-spacing: -0.4px; margin-bottom: 14px; }
.inner-page h2 { font-size: 1.25rem; font-weight: 700; color: var(--text); margin: 28px 0 10px; }
.inner-page p { font-size: 1rem; color: var(--text-muted); line-height: 1.85; margin-bottom: 16px; }
.inner-page ul { padding-left: 22px; margin-bottom: 16px; max-width: 100%; box-sizing: border-box; }
.inner-page li { font-size: 1rem; color: var(--text-muted); line-height: 1.85; margin-bottom: 6px; }
.article-page { max-width: 780px; margin: 0 auto; padding-top: 8px; }
/* Tool pages — wider than article but still centered */
.tool-page-layout { max-width: 900px; margin: 0 auto; }

/* ── Prev / Next tool navigation ── */
.tool-nav-row {
  display: flex;
  gap: .85rem;
  margin: 1.2rem 0;
}
.tool-nav-placeholder { flex: 1; }
.tool-nav-card {
  flex: 1;
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: .8rem 1rem;
  border-radius: 12px;
  border: 1.5px solid var(--border);
  background: var(--card);
  text-decoration: none;
  color: var(--text);
  transition: border-color .18s, box-shadow .18s, transform .18s;
  min-width: 0;
}
.tool-nav-card:hover {
  border-color: var(--tnc-color, var(--accent));
  box-shadow: 0 4px 14px rgba(0,0,0,.09);
  transform: translateY(-2px);
}
.tool-nav-card.tool-nav-next { flex-direction: row-reverse; text-align: right; }
.tool-nav-icon {
  width: 36px; height: 36px; flex-shrink: 0;
  border-radius: 9px;
  background: color-mix(in srgb, var(--tnc-color, var(--accent)) 14%, transparent);
  color: var(--tnc-color, var(--accent));
  display: flex; align-items: center; justify-content: center;
  font-size: .95rem;
}
.tool-nav-dir {
  font-size: .7rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: .06em;
  color: var(--text-muted); margin-bottom: 2px;
}
/* Arrow chevron button on right side of prev, left side of next */
.tool-nav-card .tool-nav-arrow {
  display: flex; align-items: center; justify-content: center;
  width: 28px; height: 28px; flex-shrink: 0;
  border-radius: 50%;
  border: 1.5px solid var(--border);
  color: var(--tnc-color, var(--accent));
  font-size: .7rem;
  margin-left: auto;
  transition: background .15s, border-color .15s;
}
.tool-nav-card.tool-nav-next .tool-nav-arrow { margin-left: 0; margin-right: auto; }
.tool-nav-card:hover .tool-nav-arrow {
  background: color-mix(in srgb, var(--tnc-color, var(--accent)) 12%, transparent);
  border-color: var(--tnc-color, var(--accent));
}
.tool-nav-name {
  font-size: .88rem; font-weight: 700;
  color: var(--text); line-height: 1.25;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  min-width: 0;
}
.tool-nav-text {
  min-width: 0; overflow: hidden; flex: 1;
}
@media (max-width: 640px) {
  .tool-nav-row { gap: .45rem; }
  .tool-nav-card { padding: .6rem .7rem; gap: .4rem; }
  .tool-nav-icon { width: 28px; height: 28px; font-size: .75rem; flex-shrink: 0; }
  .tool-nav-arrow { width: 22px; height: 22px; font-size: .6rem; flex-shrink: 0; }
  .tool-nav-dir { font-size: .6rem; }
  .tool-nav-name { font-size: .75rem; }
}
.article-breadcrumb { display: flex; gap: 6px; align-items: center; margin-bottom: 18px; font-size: 0.85rem; color: var(--text-muted); font-weight: 600; }
.article-breadcrumb a:hover { color: var(--accent); }
.article-breadcrumb span { opacity: 0.4; }
.article-cat-badge { display: inline-block; padding: 3px 11px; border-radius: 999px; background: rgba(79,70,229,0.08); border: 1px solid rgba(79,70,229,0.15); font-size: 0.72rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.7px; color: var(--accent); margin-bottom: 12px; }
.article-page h1 { font-size: 2rem; font-weight: 700; color: var(--text); line-height: 1.2; letter-spacing: -0.4px; margin-bottom: 14px; }
.article-meta { font-size: 0.84rem; color: var(--text-muted); font-weight: 500; margin-bottom: 24px; border-bottom: 1px solid var(--border); padding-bottom: 20px; }
.article-intro { font-size: 1.05rem; color: var(--text-muted); line-height: 1.85; margin-bottom: 30px; }
.article-body { font-size: 1rem; color: var(--text-muted); line-height: 1.9; }
.article-body h2 { font-size: 1.45rem; font-weight: 700; color: var(--text); margin: 34px 0 12px; letter-spacing: -0.3px; }
.article-body h3 { font-size: 1.1rem; font-weight: 600; color: var(--text); margin: 22px 0 8px; }
.article-body p { margin-bottom: 16px; }
.article-body ul, .article-body ol { padding-left: 22px; margin-bottom: 16px; }
.article-body li { margin-bottom: 6px; }
.article-body strong { color: var(--text); font-weight: 700; }
.article-body a { color: var(--accent); }
.article-body a:hover { text-decoration: underline; }
.article-body .math-box {
  background: #f8f9fc; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 16px 20px; margin: 20px 0;
  font-family: 'JetBrains Mono', monospace; font-size: 0.92rem;
  color: var(--text); overflow-x: auto; line-height: 1.8;
}
.article-body table { width: 100%; border-collapse: collapse; margin: 20px 0; font-size: 0.95rem; border-radius: var(--radius); overflow: hidden; }
.article-body th { background: #f1f4fa; padding: 10px 14px; text-align: left; font-weight: 800; color: var(--text); border-bottom: 2px solid var(--border); }
.article-body td { padding: 9px 14px; border-bottom: 1px solid var(--border); color: var(--text-muted); }
.article-body tr:last-child td { border-bottom: none; }
.article-body tr:hover td { background: #f8f9fc; }
.article-related { margin-top: 40px; padding-top: 28px; border-top: 1px solid var(--border); }
.article-related h3 { font-size: 1.05rem; font-weight: 900; color: var(--text); margin-bottom: 14px; }
.article-related-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 10px; }
.article-related-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 12px 14px; display: flex; align-items: center; gap: 10px;
  font-size: 0.88rem; font-weight: 700; color: var(--text-muted); transition: color var(--ease), background var(--ease), border-color var(--ease);
}
.article-related-card::before {
  font-family: 'Font Awesome 6 Free'; font-weight: 900;
  content: '\f002';
  font-size: .8rem; flex-shrink: 0; opacity: .65;
}
.article-related-card:hover { border-color: var(--accent); color: var(--accent); background: rgba(79,70,229,0.04); }
.article-related-card:hover::before { opacity: 1; }

/* ===== CATEGORY LANDING PAGES ===== */
.cat-landing { max-width: 780px; margin: 0 auto; }
.cat-hero {
  display: flex; align-items: flex-start; gap: 20px;
  background: linear-gradient(135deg, #4f46e5, #7c3aed);
  border-radius: 20px; padding: 32px 28px;
  margin-bottom: 32px; color: #fff;
}
.cat-hero-icon {
  font-size: 2.5rem; background: rgba(255,255,255,0.15);
  border-radius: 16px; width: 72px; height: 72px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; color: #fff;
}
.cat-hero h1 { font-size: 2rem; font-weight: 900; margin-bottom: 8px; color: #fff; }
.cat-hero p { font-size: 1rem; line-height: 1.75; color: rgba(255,255,255,0.82); }

.topic-grid { display: flex; flex-direction: column; gap: 10px; margin-bottom: 36px; }
.topic-card {
  display: flex; align-items: center; gap: 18px;
  background: var(--card); border: 1px solid var(--border); border-radius: 14px;
  padding: 18px 20px; color: var(--text);
  transition: border-color var(--ease), box-shadow var(--ease), transform var(--ease);
  box-shadow: 0 1px 4px rgba(0,0,0,0.04);
}
.topic-card:hover { border-color: var(--accent); box-shadow: 0 4px 16px rgba(79,70,229,0.1); transform: translateX(3px); }
.topic-icon {
  width: 48px; height: 48px; border-radius: 12px;
  background: rgba(79,70,229,0.1); display: flex; align-items: center; justify-content: center;
  font-size: 1.3rem; color: var(--accent); flex-shrink: 0;
}
.topic-body { flex: 1; min-width: 0; }
.topic-body strong { display: block; font-size: 1rem; font-weight: 800; color: var(--text); margin-bottom: 4px; }
.topic-body p { font-size: 0.88rem; color: var(--text-muted); line-height: 1.6; margin: 0; }
.topic-arrow { color: var(--text-muted); font-size: 0.9rem; flex-shrink: 0; transition: transform var(--ease); }
.topic-card:hover .topic-arrow { transform: translateX(4px); color: var(--accent); }

.cat-about h2 { font-size: 1.3rem; font-weight: 800; color: var(--text); margin: 28px 0 10px; }
.cat-about p { font-size: 1rem; color: var(--text-muted); line-height: 1.85; margin-bottom: 14px; }
.cat-about a { color: var(--accent); }
.cat-about a:hover { text-decoration: underline; }

/* ===== INNER PAGES ===== */
.inner-page { max-width: 780px; margin: 0 auto; padding-top: 8px; }
.inner-page h1 { font-size: 2rem; font-weight: 700; color: var(--text); margin-bottom: 14px; }
.inner-page p { font-size: 1rem; color: var(--text-muted); line-height: 1.85; margin-bottom: 14px; }
.inner-page h2 { font-size: 1.2rem; font-weight: 700; color: var(--text); margin: 28px 0 10px; }
.inner-page a { color: var(--accent); }
.inner-page a:hover { text-decoration: underline; }
.inner-page .article-breadcrumb { margin-bottom: 20px; }

/* ===== 404 ===== */
.not-found { text-align: center; padding: 60px 20px; max-width: 520px; margin: 0 auto; }
.not-found-code { font-size: 7rem; font-weight: 900; line-height: 1; color: var(--border); letter-spacing: -4px; margin-bottom: 8px; }
.not-found-title { font-size: 1.8rem; font-weight: 700; color: var(--text); margin-bottom: 14px; }
.not-found-desc { font-size: 1rem; color: var(--text-muted); line-height: 1.8; margin-bottom: 32px; }
.not-found-btn { display: inline-flex; }
.not-found-links { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin-top: 32px; }
.not-found-links a { padding: 8px 16px; border-radius: var(--radius); background: var(--card); border: 1px solid var(--border); font-size: 0.88rem; font-weight: 600; color: var(--text-muted); transition: border-color var(--ease), color var(--ease); }
.not-found-links a:hover { border-color: var(--accent); color: var(--accent); }

.contact-form { display: flex; flex-direction: column; gap: 18px; max-width: 520px; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group label { font-size: 0.9rem; font-weight: 800; color: var(--text); }
.form-group input, .form-group textarea {
  background: #fff; border: 1.5px solid var(--border); border-radius: var(--radius);
  padding: 10px 14px; color: var(--text); font-size: 1rem; font-family: inherit;
  outline: none; transition: border-color var(--ease);
}
.form-group input:focus, .form-group textarea:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(79,70,229,0.1); }
.form-group textarea { resize: vertical; min-height: 130px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 28px; border-radius: 999px;
  background: var(--accent); color: #fff; font-size: 0.95rem; font-weight: 800;
  cursor: pointer; border: none;
  box-shadow: 0 4px 0 #2d24a3;
  transition: transform 0.08s, box-shadow 0.08s, background 0.15s;
}
.btn:hover { background: #4338ca; }
.btn:active { transform: translateY(3px); box-shadow: 0 1px 0 #2d24a3; }

/* ===== FOOTER ===== */
footer {
  border-top: 1px solid var(--border);
  background: #fff;
  width: 100%;
  height: 54px;
  margin-top: 0;
}
.footer-inner {
  width: 100%; max-width: 1200px;
  margin: 0 auto;
  padding: 0 40px;
  height: 100%;
  display: flex; align-items: center; gap: 24px;
}
.footer-brand { font-size: 1.05rem; font-weight: 700; color: var(--text); }
.footer-nav { display: flex; gap: 2px; margin-left: auto; }
.footer-nav a { padding: 5px 10px; border-radius: 6px; font-size: 0.82rem; font-weight: 600; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.4px; transition: color var(--ease); }
.footer-nav a:hover { color: var(--accent); }
.footer-copy { font-size: 0.82rem; font-weight: 600; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.4px; white-space: nowrap; }

/* ===== POSTS LISTING ===== */
.posts-intro { font-size: 1rem; color: var(--text-muted); margin: 0 0 36px; max-width: 680px; line-height: 1.65; }

.posts-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
@media (max-width: 900px) { .posts-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .posts-grid { grid-template-columns: 1fr; } }

.post-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px 22px 18px;
  text-decoration: none;
  color: inherit;
  transition: box-shadow 0.18s ease, transform 0.18s ease, background 0.18s ease;
}
.post-card:hover {
  box-shadow: 0 6px 24px rgba(79,70,229,0.10);
  transform: translateY(-2px);
  background: var(--card-hover);
}

.post-card-cat {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--accent);
  background: rgba(79, 70, 229, 0.08);
  border-radius: 20px;
  padding: 3px 10px;
  width: fit-content;
}

.post-card-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  margin: 0;
  line-height: 1.3;
}

.post-card-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin: 0;
  line-height: 1.55;
  flex: 1;
}

.post-card-link {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  margin-top: 4px;
}

/* ===== VAULT OVERLAY ===== */
.vault-overlay {
  display: none; position: fixed; inset: 0;
  background:
    linear-gradient(rgba(8,5,2,0.82), rgba(8,5,2,0.82)),
    url('https://images.unsplash.com/photo-1538481199705-c710c4e965fc?w=1920&q=80') center/cover no-repeat fixed;
  z-index: 9000;
  flex-direction: column;
  animation: vault-in 0.18s ease;
}
.vault-overlay .vault-topbar       { background: rgba(10,6,2,0.45); border-bottom-color: rgba(255,255,255,0.06); }
.vault-overlay .vault-cat-sidebar  { background: rgba(10,6,2,0.45); border-right-color: rgba(255,255,255,0.06); }
.vault-overlay .vault-main-area    { background: transparent; }
.vault-overlay .vault-frame-header { background: rgba(10,6,2,0.45); border-bottom-color: rgba(255,255,255,0.06); }
.vault-overlay .vault-side-left    { background: rgba(10,6,2,0.35); border-right-color: rgba(255,255,255,0.06); }
.vault-overlay .vault-side-right   { background: rgba(10,6,2,0.35); border-left-color: rgba(255,255,255,0.06); }
.vault-overlay .vault-req-panel,
.vault-overlay .vault-codes-panel  { background: transparent; }
.vault-overlay.open { display: flex; }
@keyframes vault-in { from { opacity: 0; } to { opacity: 1; } }

/* Top bar */
.vault-topbar {
  display: flex; align-items: center; gap: 12px;
  padding: 0 16px; height: 46px; flex-shrink: 0;
  background: #130f09; border-bottom: 1px solid #2a1e10;
  position: relative;
}
.vault-esc-hint { display: none; }
.vault-esc-close {
  display: inline-flex; align-items: center; justify-content: center;
  width: 14px; height: 14px; margin-left: 5px;
  font-size: 0.6rem; color: #6b5a46; background: none; border: none;
  cursor: pointer; padding: 0; border-radius: 50%;
  transition: color 0.15s;
}
.vault-esc-close:hover { color: #a89880; }
.vault-esc-hint kbd {
  display: inline-flex; align-items: center; justify-content: center;
  font-family: inherit; font-size: 0.7rem; font-weight: 700; color: #a89880;
  background: #1e1509; border: 1px solid #3a2e1e;
  border-bottom: 2px solid #3a2e1e;
  border-radius: 4px; padding: 1px 6px; letter-spacing: 0.02em;
  box-shadow: 0 1px 0 #0a0703;
}
.vault-topbar-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 12px; border-radius: 999px;
  background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.1);
  color: #a89880; font-size: 0.85rem; font-weight: 600;
  cursor: pointer; transition: color 0.18s, background 0.18s, border-color 0.18s; white-space: nowrap; flex-shrink: 0;
}
.vault-topbar-btn:hover { color: #f1ece6; background: rgba(255,255,255,0.12); border-color: rgba(255,255,255,0.2); }
.vault-top-games { display: none; }
#vault-theme-btn { margin-left: auto; }
#vault-close-btn { background: #ef4444; color: #fff; border-color: #ef4444; display: flex; align-items: center; gap: 5px; }
#vault-close-btn:hover { background: #dc2626; color: #fff; border-color: #dc2626; }
.vault-close-label { font-size: 0.8rem; font-weight: 700; letter-spacing: 0.3px; }
@media (max-width: 600px) { .vault-close-label { display: none; } }
.vault-top-games .vtg-avatar {
  width: 36px; height: 36px; border-radius: 50%;
  border: 1px solid #2a1e10; flex-shrink: 0;
  background: #2a1e10; cursor: pointer;
  transition: transform 0.15s; position: relative;
}
.vtg-label { font-size: 0.85rem; font-weight: 600; color: #a89880; white-space: nowrap; margin-right: 12px; }
.vault-top-games .vtg-avatar + .vtg-avatar { margin-left: -10px; }
.vault-top-games .vtg-avatar:hover { transform: translateY(-3px) scale(1.12); z-index: 5; }
.vault-top-games .vtg-avatar img {
  width: 100%; height: 100%; object-fit: cover;
  border-radius: 50%; display: block;
  transform: scale(1.25);
}
.vault-top-games .vtg-avatar.vtg-first { z-index: 4; }
.vault-top-games .vtg-avatar.vtg-first::before,
.vault-top-games .vtg-avatar.vtg-first::after {
  content: '';
  position: absolute; inset: 0; border-radius: 50%;
  border: 1.5px solid rgba(194,65,12,0.85);
  animation: vtg-signal 2.2s ease-out infinite;
  pointer-events: none;
}
.vault-top-games .vtg-avatar.vtg-first::after { animation-delay: 0.8s; }
@keyframes vtg-signal {
  0%   { transform: scale(1);    opacity: 1; }
  100% { transform: scale(2.6);  opacity: 0; }
}
.vault-topbar-center {
  position: absolute; left: 50%; transform: translateX(-50%);
  display: flex; align-items: center; justify-content: center; gap: 0;
  width: 60%; max-width: 620px; min-width: 280px;
  pointer-events: none;
}
.vault-topbar-center > * { pointer-events: auto; }
.vault-logo-text { font-size: 1.1rem; font-weight: 800; color: #f1ece6; white-space: nowrap; letter-spacing: -0.3px; }
.vault-search-wrap { position: relative; width: 100%; max-width: 340px; min-width: 200px; flex: 1; }
.vault-search-icon { position: absolute; left: 13px; top: 50%; transform: translateY(-50%); color: #a89880; pointer-events: none; }
.vault-search {
  width: 100%; background: rgba(255,255,255,0.07); border: 1.5px solid rgba(255,255,255,0.12);
  border-radius: 999px; padding: 6px 32px 6px 36px; color: #f1ece6;
  font-size: 0.88rem; font-family: inherit; outline: none; transition: border-color 0.18s, background 0.18s;
}
.vault-search:focus { border-color: rgba(255,255,255,0.3); background: rgba(255,255,255,0.1); }
.vault-search::placeholder { color: #6b5a46; }
.vault-search-clear {
  position: absolute; right: 12px; top: 50%; transform: translateY(-50%);
  background: none; border: none; color: #a89880; font-size: 0.75rem;
  cursor: pointer; padding: 0; line-height: 1; width: 18px; height: 18px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%;
}
.vault-search-clear:hover { color: #f1ece6; background: rgba(255,255,255,0.08); }

/* Body layout: sidebar + main */
.vault-body { display: flex; flex: 1; overflow: hidden; }

/* Sidebar toggle button (desktop only) */
.vault-sidebar-toggle {
  display: inline-flex; align-items: center; justify-content: center;
  width: 28px; height: 28px; border-radius: 6px; flex-shrink: 0;
  background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.1);
  color: #a89880; font-size: 0.85rem; cursor: pointer;
  transition: color 0.18s, background 0.18s, border-color 0.18s;
}
.vault-sidebar-toggle:hover { color: #f1ece6; background: rgba(255,255,255,0.12); border-color: rgba(255,255,255,0.2); }

/* Category sidebar */
.vault-cat-sidebar {
  width: 160px; flex-shrink: 0;
  background: #130f09; border-right: 1px solid #2a1e10;
  overflow-y: auto; padding: 12px 0;
  display: flex; flex-direction: column;
  transition: width 0.22s ease, opacity 0.18s ease;
}
.vault-cat-sidebar.sidebar-collapsed {
  width: 0; overflow: hidden; opacity: 0; padding: 0; border-right: none;
}
.vault-cat-link {
  display: flex; align-items: center; gap: 9px;
  padding: 8px 14px;
  font-size: 0.85rem; font-weight: 600; color: #a89880;
  border-left: 2px solid transparent;
  border-bottom: none;
  cursor: pointer; transition: color 0.18s, background 0.18s, border-color 0.18s;
  white-space: nowrap;
}
.vault-cat-link i { width: 16px; text-align: center; flex-shrink: 0; font-size: 0.95rem; transition: opacity 0.18s; }
/* Colorful category icons */
.vault-cat-link[data-cat=""]         i { color: #a78bfa; }
.vault-cat-link[data-cat="action"]   i { color: #f59e0b; }
.vault-cat-link[data-cat="adventure"]i { color: #34d399; }
.vault-cat-link[data-cat="arcade"]   i { color: #f472b6; }
.vault-cat-link[data-cat="casual"]   i { color: #60a5fa; }
.vault-cat-link[data-cat="horror"]   i { color: #a3e635; }
.vault-cat-link[data-cat="idle"]     i { color: #94a3b8; }
.vault-cat-link[data-cat="io"]       i { color: #22d3ee; }
.vault-cat-link[data-cat="platformer"]i{ color: #fb923c; }
.vault-cat-link[data-cat="puzzle"]   i { color: #c084fc; }
.vault-cat-link[data-cat="racing"]   i { color: #f43f5e; }
.vault-cat-link[data-cat="shooter"]  i { color: #ef4444; }
.vault-cat-link[data-cat="sports"]   i { color: #4ade80; }
.vault-cat-link[data-cat="strategy"]   i { color: #e2c87a; }
.vault-cat-link[data-cat="open-world"] i { color: #38bdf8; }
.vault-cat-link[data-cat="multiplayer"]i { color: #f87171; }
.vault-cat-exit-btn i { color: #fff; }
.vault-cat-link + .vault-cat-link { border-top: 1px solid #2a1e10; }
.vault-cat-link:hover { color: #f1ece6; background: #1e1509; border-left-color: #c2410c; }
.v-cat-badge { margin-left: auto; font-size: 0.6rem; font-weight: 700; padding: 1px 5px; border-radius: 4px; letter-spacing: 0.03em; flex-shrink: 0; }
.v-cat-badge-hot { background: rgba(239,68,68,0.18); color: #f87171; }
.v-cat-badge-top { background: rgba(168,85,247,0.18); color: #c084fc; }
.v-cat-badge-new { background: rgba(34,197,94,0.18); color: #4ade80; }
.vault-cat-link.active { color: #f1ece6; font-weight: 700; background: linear-gradient(90deg, #1e1509, transparent); border-left-color: #ea580c; }

/* Main grid area */
.vault-main-area { flex: 1; overflow-y: auto; padding: 6px 12px 12px; }
.vault-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  grid-auto-rows: 118px;
  grid-auto-flow: dense;
  gap: 10px;
}
.vault-grid-sentinel { grid-column: 1 / -1; height: 1px; }

/* ── Vault ad cards ── */
.v-card-ad {
  background: #1a1108;
  border: 1px solid #2a1e10;
  border-radius: 8px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}
.v-card-ad::after {
  content: 'Ad';
  position: absolute;
  top: 4px;
  right: 6px;
  font-size: 9px;
  color: #5a4a35;
  letter-spacing: 0.5px;
  pointer-events: none;
  z-index: 1;
}
.v-card-ad-300x250 { grid-column: span 2; grid-row: span 2; }
.v-card-ad-160x300 { grid-column: span 1; grid-row: span 3; }
.v-card-ad-native  { grid-column: 1 / -1; min-height: 100px; overflow: visible; }

/* Card */
.v-card {
  background: #1c1208; border: 1px solid #2a1e10;
  border-radius: 8px; overflow: hidden; cursor: pointer;
  display: block; transition: border-color 0.18s, transform 0.15s;
  height: 100%;
}
.v-card-featured { grid-column: span 2; grid-row: span 2; }

/* Diagonal shine sweep on featured cards */
.v-shine {
  position: absolute; inset: 0; pointer-events: none; overflow: hidden;
  border-radius: 8px; z-index: 2;
}
.v-shine::after {
  content: '';
  position: absolute;
  top: -80%; left: 0;
  width: 40%; height: 260%;
  background: linear-gradient(
    105deg,
    transparent 30%,
    rgba(255,255,255,0.13) 48%,
    rgba(255,255,255,0.22) 52%,
    transparent 70%
  );
  animation: v-shine-sweep 5s ease-in-out infinite;
  animation-delay: var(--shine-delay, 0s);
}
@keyframes v-shine-sweep {
  0%   { transform: translateX(-150%) skewX(-15deg); opacity: 0; }
  8%   { transform: translateX(-150%) skewX(-15deg); opacity: 1; }
  40%  { transform: translateX(325%) skewX(-15deg); opacity: 1; }
  41%  { transform: translateX(325%) skewX(-15deg); opacity: 0; }
  100% { transform: translateX(325%) skewX(-15deg); opacity: 0; }
}
/* Stagger shine timing per card position */
.v-card-featured:nth-child(2)  .v-shine { --shine-delay: 0s; }
.v-card-featured:nth-child(11) .v-shine { --shine-delay: 0.7s; }
.v-card-featured:nth-child(20) .v-shine { --shine-delay: 1.4s; }
.v-card-featured:nth-child(29) .v-shine { --shine-delay: 2.1s; }
.v-card-featured:nth-child(38) .v-shine { --shine-delay: 2.8s; }
.v-card-featured:nth-child(n)  .v-shine { --shine-delay: 1s; }

.v-card:hover { border-color: transparent !important; transform: translateY(-2px); box-shadow: none; }
.v-thumb {
  position: relative; overflow: hidden;
  background: #1e1509;
  height: 100%;
}
/* Shimmer loading */
.v-thumb::before {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.04), transparent);
  background-size: 200% 100%; animation: vshimmer 1.4s infinite;
}
.v-thumb.loaded::before { display: none; }
@keyframes vshimmer { 0% { background-position: -200% 0; } 100% { background-position: 200% 0; } }
.v-thumb img {
  width: 100%; height: 100%; display: block;
  object-fit: cover; position: absolute; inset: 0;
  opacity: 0; transition: opacity 0.3s ease;
}
.v-thumb img.loaded { opacity: 1; }

/* ── Favourite heart button ── */
.v-fav-btn {
  position: absolute; top: 6px; right: 6px; z-index: 4;
  width: 28px; height: 28px; border-radius: 50%;
  background: rgba(0,0,0,0.45); backdrop-filter: blur(4px);
  border: none; cursor: pointer; padding: 0;
  display: flex; align-items: center; justify-content: center;
  color: rgba(255,255,255,0.7); font-size: .8rem;
  opacity: 0; transform: scale(0.8);
  transition: opacity .18s, transform .18s, color .15s, background .15s;
}
.v-card:hover .v-fav-btn { opacity: 1; transform: scale(1); }
.v-fav-btn.active { opacity: 1; transform: scale(1); color: #f43f5e; background: rgba(0,0,0,0.55); }
.v-fav-btn:hover { background: rgba(0,0,0,0.7); color: #f43f5e; }
.v-fav-btn.active:hover { color: #fb7185; }
@keyframes fav-pop { 0% { transform: scale(1); } 40% { transform: scale(1.45); } 70% { transform: scale(0.9); } 100% { transform: scale(1); } }
.v-fav-btn.pop { animation: fav-pop 0.35s ease; }

/* Topbar favourites button */
.vault-fav-topbar-btn { position: relative; color: #f43f5e; transition: box-shadow .18s; }
.vault-fav-topbar-btn i { font-size: .9rem; }
.vault-fav-topbar-btn.active { box-shadow: 0 0 0 3px rgba(244,63,94,0.25); border-radius: 6px; }
.vault-fav-count {
  position: absolute; top: -5px; right: -5px;
  min-width: 16px; height: 16px; padding: 0 3px;
  background: #f43f5e; color: #fff; font-size: .65rem; font-weight: 700;
  border-radius: 8px; display: inline-flex; align-items: center; justify-content: center;
  pointer-events: none;
}

/* Sidebar favourites link */
.vault-fav-link { position: relative; }
.vault-fav-count-side {
  margin-left: auto; min-width: 18px; height: 18px; padding: 0 4px;
  background: #f43f5e; color: #fff; font-size: .65rem; font-weight: 700;
  border-radius: 9px; display: inline-flex; align-items: center; justify-content: center;
}

/* Hover overlay */
.v-card-overlay {
  position: absolute; inset: 0;
  background: rgba(0,0,0,0.38);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; transition: opacity 0.2s ease;
}
.v-card:hover .v-card-overlay { opacity: 1; }
.v-play-btn {
  width: 48px; height: 48px; border-radius: 50%;
  background: #c2410c; color: #fff;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 0 0 6px rgba(194,65,12,0.25);
}
.v-play-btn svg { width: 18px; height: 18px; margin-left: 3px; }
/* Vignette title */
.v-card-info {
  position: absolute; bottom: 0; left: 0; right: 0;
  padding: 28px 9px 9px;
  background: linear-gradient(to top, rgba(0,0,0,0.85) 0%, rgba(0,0,0,0.4) 55%, transparent 100%);
  pointer-events: none;
}
.v-card-name {
  display: block; font-size: 0.78rem; font-weight: 700; color: #fff;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  text-shadow: 0 1px 4px rgba(0,0,0,0.7); margin: 0;
}
.v-card-empty { text-align: center; color: #6b5a46; font-size: 0.9rem; padding: 60px 20px; grid-column: 1/-1; }

/* ── Vault skeleton loading ── */
@keyframes vault-shimmer {
  0%   { background-position: -400px 0; }
  100% { background-position:  400px 0; }
}
.v-card-skeleton { pointer-events: none; cursor: default; }
.v-card-skeleton .v-thumb {
  background: linear-gradient(90deg, #281d0e 25%, #3a2a12 50%, #281d0e 75%);
  background-size: 800px 100%;
  animation: vault-shimmer 1.4s infinite linear;
  aspect-ratio: 1 / 1;
}
.vault-overlay.vault-light .v-card-skeleton .v-thumb {
  background: linear-gradient(90deg, #ebebeb 25%, #d8d8d8 50%, #ebebeb 75%);
  background-size: 800px 100%;
}

/* Play view */
.vault-play-view { flex: 1; overflow: hidden; display: flex; flex-direction: column; min-height: 0; }
.vault-split { display: flex; flex: 1; min-height: 0; }
.vault-side-left, .vault-side-right {
  width: 180px; flex-shrink: 0; background: #130f09;
  overflow-y: auto; padding: 10px 8px;
}
.vault-side-left { border-right: 1px solid #2a1e10; }
.vault-side-right { border-left: 1px solid #2a1e10; }
.vault-side-label { font-size: 0.68rem; font-weight: 700; text-transform: uppercase; letter-spacing: 1px; color: #6b5a46; padding: 4px 8px 10px; }
.vault-side-card { display: block; border-radius: 6px; overflow: hidden; background: #1c1208; margin-bottom: 8px; cursor: pointer; border: 1px solid #2a1e10; transition: border-color 0.15s; }
.vault-side-card:hover { border-color: #c2410c; }
.vault-side-thumb { width: 100%; aspect-ratio: 16/10; background-size: cover; background-position: center; background-color: #1e1509; }
.vault-side-info { padding: 5px 8px 6px; }
.vault-side-title { font-size: 0.68rem; font-weight: 600; color: #c9b99a; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; display: block; }
.vault-main-frame { flex: 1; display: flex; flex-direction: column; overflow: hidden; min-height: 0; }
.vault-frame-header { display: flex; align-items: center; justify-content: space-between; padding: 10px 16px; background: #130f09; border-bottom: 1px solid #2a1e10; flex-shrink: 0; position: relative; }
.vault-frame-left { display: flex; align-items: center; gap: 6px; }
.vault-frame-center { position: absolute; left: 50%; transform: translateX(-50%); display: flex; align-items: center; pointer-events: none; }
.vault-frame-center > * { pointer-events: auto; }
.vault-play-title { font-size: 1rem; font-weight: 700; color: #f1ece6; white-space: nowrap; }
.vault-fs-btn { display: inline-flex; align-items: center; justify-content: center; width: 32px; height: 32px; border-radius: 6px; background: #1e1509; border: 1px solid #2a1e10; color: #a89880; cursor: pointer; transition: color 0.15s, border-color 0.15s; }
.vault-fs-btn:hover { color: #f1ece6; border-color: #c2410c; }
.vault-frame-btns { display: flex; align-items: center; gap: 6px; flex-shrink: 0; }
#vault-loader-bar { position: absolute; bottom: -1px; left: 0; right: 0; height: 3px; background: transparent; pointer-events: none; transition: opacity 0.3s; }
#vault-loader-fill { height: 100%; width: 0%; background: linear-gradient(90deg, #ff6b35, #ff3f6c); border-radius: 0 2px 2px 0; }
.vault-overlay.vault-light #vault-loader-fill { background: linear-gradient(90deg, #4f8ef7, #7c3aed); }
.vault-play-fav-btn { display: inline-flex; align-items: center; justify-content: center; width: 32px; height: 32px; border-radius: 6px; background: #1e1509; border: 1px solid #2a1e10; color: #a89880; font-size: 0.95rem; cursor: pointer; transition: color 0.15s, border-color 0.15s, background 0.15s; -webkit-tap-highlight-color: transparent; }
.vault-play-fav-btn:hover { color: #f43f5e; border-color: #f43f5e; }
.vault-play-fav-btn.active { color: #f43f5e; border-color: #f43f5e; background: rgba(244,63,94,0.1); }
.vault-play-fav-btn.pop { animation: v-fav-pop 0.28s ease; }
@keyframes v-fav-pop { 0%{transform:scale(1)} 40%{transform:scale(1.35)} 100%{transform:scale(1)} }
.vault-overlay.vault-light .vault-play-fav-btn { background: #f0f0f0; border-color: #d0d0d0; color: #888; }
.vault-overlay.vault-light .vault-play-fav-btn:hover { color: #f43f5e; border-color: #f43f5e; }
.vault-overlay.vault-light .vault-play-fav-btn.active { color: #f43f5e; border-color: #f43f5e; background: rgba(244,63,94,0.08); }
#vault-iframe { width: 100%; height: 100%; border: none; flex: 1; }

/* ===== REQUEST GAME PANEL ===== */
.vault-codes-link i { color: #facc15 !important; }
.vault-codes-link { border-bottom: none; color: #ca8a04 !important; font-weight: 600; }
.vault-codes-link.active { color: #facc15 !important; border-left-color: #facc15; }
.vault-codes-panel { flex-direction: column; padding: 20px 16px; overflow-y: auto; height: 100%; box-sizing: border-box; }
.codes-header { margin-bottom: 16px; }
.codes-title { font-size: 1.1rem; font-weight: 800; color: #f1ece6; margin-bottom: 10px; }
.codes-search { width: 100%; box-sizing: border-box; padding: 7px 12px; border-radius: 999px; border: 1.5px solid rgba(255,255,255,0.12); background: rgba(255,255,255,0.07); color: #f1ece6; font-size: 0.85rem; font-family: inherit; outline: none; transition: border-color 0.18s, background 0.18s; }
.codes-search::placeholder { color: rgba(255,255,255,0.35); }
.codes-search:focus { border-color: rgba(255,255,255,0.3); background: rgba(255,255,255,0.1); }
.vault-overlay.vault-light .codes-search { background: #fff; border-color: #d4d4d4; color: #111; }
.vault-overlay.vault-light .codes-search::placeholder { color: #aaa; }
.vault-overlay.vault-light .codes-search:focus { border-color: #666; background: #fff; }
.codes-list { flex: 1; overflow-y: auto; display: flex; flex-direction: column; gap: 2px; padding: 0 10px; }
.codes-row { display: flex; align-items: center; justify-content: space-between; padding: 7px 10px; border-radius: 7px; cursor: pointer; transition: background 0.15s; }
.codes-row:hover { background: rgba(0,0,0,0.35); }
.codes-thumb { width: 28px; height: 28px; border-radius: 5px; object-fit: cover; flex-shrink: 0; margin-right: 8px; background: #1a130a; }
.codes-name { font-size: 0.82rem; color: #e8e0d8; flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; margin-right: 10px; }
.codes-code { font-family: 'JetBrains Mono', monospace; font-size: 0.85rem; font-weight: 700; color: #facc15; background: rgba(250,204,21,0.12); padding: 2px 8px; border-radius: 5px; flex-shrink: 0; letter-spacing: 2px; }
.vault-overlay.vault-light .codes-title { color: #111; }
.vault-overlay.vault-light .codes-name { color: #222; }
.vault-overlay.vault-light .codes-code { color: #dc2626; background: rgba(220,38,38,0.1); }
.vault-overlay.vault-light .codes-row:hover { background: rgba(0,0,0,0.08); }
.codes-empty { color: var(--text-muted); font-size: 0.85rem; padding: 16px 0; text-align: center; }
.vault-cat-exit-btn {
  display: flex; align-items: center; gap: 9px;
  margin-top: auto;
  padding: 11px 14px;
  font-size: 0.85rem; font-weight: 700;
  color: #fff;
  background: #ef4444;
  border: none;
  border-radius: 0;
  cursor: pointer; transition: background 0.18s;
  white-space: nowrap; text-align: left;
  width: 100%; flex-shrink: 0;
}
.vault-cat-exit-btn:hover { background: #dc2626; }
.vault-req-panel { padding: 24px 20px; overflow-y: auto; height: 100%; box-sizing: border-box; }
.req-header { margin-bottom: 22px; }
.req-title { font-size: 1.15rem; font-weight: 800; color: #f1ece6; margin-bottom: 4px; }
.req-sub { font-size: 0.82rem; color: #a89880; }
.req-loading { color: #6b5a46; font-size: 0.88rem; padding: 8px 0; }

/* ── Poll options grid (Instagram-style) ── */
.req-poll-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-bottom: 24px; }
.req-poll-option {
  position: relative; overflow: hidden;
  border: 1.5px solid #3a2510; border-radius: 10px;
  padding: 10px 12px; cursor: pointer;
  background: #1c1208;
  transition: border-color 0.2s, transform 0.12s;
  min-height: 52px; display: flex; flex-direction: column; justify-content: center;
  user-select: none;
}
.req-poll-option:hover:not(.req-revealed) { border-color: #c2410c; transform: translateY(-1px); }
.req-poll-fill {
  position: absolute; top: 0; left: 0; height: 100%; width: 0%;
  background: rgba(194,65,12,0.22); border-radius: 10px;
  transition: width 0.7s cubic-bezier(0.4,0,0.2,1);
  pointer-events: none;
}
.req-poll-option.req-my-vote .req-poll-fill { background: rgba(234,88,12,0.32); }
.req-poll-option.req-my-vote { border-color: #c2410c; }
.req-poll-label {
  position: relative; font-size: 0.82rem; font-weight: 700;
  color: #f1ece6; line-height: 1.3; margin-bottom: 3px;
}
.req-poll-bottom {
  position: relative; display: flex; align-items: center; justify-content: space-between;
}
.req-poll-pct {
  font-size: 0.75rem; font-weight: 700; color: #ea580c;
  opacity: 0; transition: opacity 0.4s;
}
.req-poll-check {
  font-size: 0.7rem; color: #ea580c; font-weight: 700;
  opacity: 0; transition: opacity 0.3s;
}
.req-poll-option.req-revealed .req-poll-pct { opacity: 1; }
.req-poll-option.req-revealed.req-my-vote .req-poll-check { opacity: 1; }
.req-poll-option.req-revealed { cursor: default; }

/* ── Poll skeleton ── */
.req-poll-option.req-skeleton { cursor: default; pointer-events: none; }
.req-skel-line {
  height: 11px; width: 70%; border-radius: 4px;
  background: linear-gradient(90deg, #2a1e10 25%, #3a2a15 50%, #2a1e10 75%);
  background-size: 200% 100%; animation: req-shimmer 1.4s infinite;
}
.req-skel-pct {
  display: inline-block; height: 9px; width: 28px; border-radius: 3px;
  background: linear-gradient(90deg, #2a1e10 25%, #3a2a15 50%, #2a1e10 75%);
  background-size: 200% 100%; animation: req-shimmer 1.4s infinite;
}
@keyframes req-shimmer { 0%{background-position:200% 0} 100%{background-position:-200% 0} }

/* ── Custom suggest section ── */
.req-divider { border: none; border-top: 1px solid #2a1e10; margin: 20px 0; }
.req-custom-label { font-size: 0.82rem; color: #a89880; margin-bottom: 10px; }
.req-custom-row { display: flex; gap: 8px; }
.req-custom-input {
  flex: 1; background: #1e1509; border: 1.5px solid #2a1e10; border-radius: 10px;
  padding: 10px 14px; color: #f1ece6; font-size: 0.88rem; outline: none; font-family: inherit;
}
.req-custom-input:focus { border-color: #c2410c; }
.req-submit-btn {
  background: #c2410c; color: #fff; border: none; border-radius: 10px;
  padding: 10px 18px; font-size: 0.85rem; font-weight: 700; cursor: pointer; white-space: nowrap;
  transition: background 0.15s;
}
.req-submit-btn:hover { background: #ea580c; }
.req-msg { font-size: 0.82rem; margin-top: 10px; min-height: 18px; }
.req-msg.ok  { color: #22c55e; }
.req-msg.err { color: #ef4444; }

/* ===== VAULT LIGHT THEME ===== */
.vault-overlay.vault-light { background: #f5f6f7; }
.vault-overlay.vault-light .vault-topbar { background: #f5f6f7; border-bottom-color: transparent; }
.vault-overlay.vault-light .vault-topbar-btn { background: #f0f0f0; border-color: #d0d0d0; color: #555; }
.vault-overlay.vault-light .vault-topbar-btn:hover { color: #111; border-color: #888; }
.vault-overlay.vault-light .vault-sidebar-toggle { background: #f0f0f0; border-color: #d0d0d0; color: #555; }
.vault-overlay.vault-light .vault-sidebar-toggle:hover { color: #111; border-color: #888; }
.vault-overlay.vault-light .vault-search { background: #fff; border-color: #d4d4d4; color: #111; }
.vault-overlay.vault-light .vault-search:focus { border-color: #666; background: #fff; }
.vault-overlay.vault-light .vault-search::placeholder { color: #aaa; }
.vault-overlay.vault-light .vault-search-icon { color: #aaa; }
.vault-overlay.vault-light .vault-search-clear { color: #aaa; }
.vault-overlay.vault-light .vault-search-clear:hover { color: #333; background: rgba(0,0,0,0.06); }
.vault-overlay.vault-light .vault-cat-sidebar { background: #f5f6f7; border-right-color: transparent; }
.vault-overlay.vault-light .vault-cat-link { color: #666; }
.vault-overlay.vault-light .vault-cat-link:hover { color: #111; background: #f0f0f0; border-left-color: #555; }
.vault-overlay.vault-light .vault-cat-link.active { color: #111; font-weight: 700; background: linear-gradient(90deg, #ebebeb, transparent); border-left-color: #444; }
.vault-overlay.vault-light .v-card { background: #fff; border-color: #e0e0e0; }
.vault-overlay.vault-light .v-card:hover { border-color: transparent; }
.vault-overlay.vault-light .v-thumb { background: #e8e8e8; }
.vault-overlay.vault-light .v-thumb::before { background: linear-gradient(90deg, transparent, rgba(255,255,255,0.5), transparent); background-size: 200% 100%; }
.vault-overlay.vault-light .v-card-empty { color: #aaa; }
.vault-overlay.vault-light .v-play-btn { background: #444; box-shadow: 0 0 0 6px rgba(68,68,68,0.2); }
.vault-overlay.vault-light .vault-side-left, .vault-overlay.vault-light .vault-side-right { background: #f5f6f7; }
.vault-overlay.vault-light .vault-side-left { border-right-color: transparent; }
.vault-overlay.vault-light .vault-side-right { border-left-color: transparent; }
.vault-overlay.vault-light .vault-side-label { color: #aaa; }
.vault-overlay.vault-light .vault-side-card { background: #fff; border-color: #e0e0e0; }
.vault-overlay.vault-light .vault-side-card:hover { border-color: #555; }
.vault-overlay.vault-light .vault-side-thumb { background-color: #e8e8e8; }
.vault-overlay.vault-light .vault-side-title { color: #555; }
.vault-overlay.vault-light .vault-frame-header { background: #f5f6f7; border-bottom-color: transparent; }
.vault-overlay.vault-light .vault-play-title { color: #111; }
.vault-overlay.vault-light .vault-fs-btn { background: #f0f0f0; border-color: #d0d0d0; color: #666; }
.vault-overlay.vault-light .vault-fs-btn:hover { color: #111; border-color: #555; }
.vault-overlay.vault-light .vault-cat-link + .vault-cat-link { border-top-color: #e0e0e0; }
.vault-overlay.vault-light .vault-cat-exit-btn { background: #ef4444; color: #fff; }
.vault-overlay.vault-light .vault-cat-exit-btn:hover { background: #dc2626; }
.vault-overlay.vault-light .req-title { color: #111; }
.vault-overlay.vault-light .req-sub { color: #666; }
.vault-overlay.vault-light .req-loading { color: #aaa; }
.vault-overlay.vault-light .req-poll-option { background: #fff; border-color: #ddd; }
.vault-overlay.vault-light .req-poll-option:hover:not(.req-revealed) { border-color: #555; }
.vault-overlay.vault-light .req-poll-fill { background: rgba(80,80,80,0.12); }
.vault-overlay.vault-light .req-poll-option.req-my-vote .req-poll-fill { background: rgba(80,80,80,0.22); }
.vault-overlay.vault-light .req-poll-option.req-my-vote { border-color: #555; }
.vault-overlay.vault-light .req-poll-label { color: #111; }
.vault-overlay.vault-light .req-poll-pct { color: #444; }
.vault-overlay.vault-light .req-poll-check { color: #444; }
.vault-overlay.vault-light .req-skel-line { background: linear-gradient(90deg, #e8e8e8 25%, #f4f4f4 50%, #e8e8e8 75%); background-size: 200% 100%; }
.vault-overlay.vault-light .req-skel-pct { background: linear-gradient(90deg, #e8e8e8 25%, #f4f4f4 50%, #e8e8e8 75%); background-size: 200% 100%; }
.vault-overlay.vault-light .req-divider { border-top-color: #e0e0e0; }
.vault-overlay.vault-light .req-custom-label { color: #666; }
.vault-overlay.vault-light .req-custom-input { background: #fff; border-color: #d4d4d4; color: #111; }
.vault-overlay.vault-light .req-custom-input:focus { border-color: #555; }
.vault-overlay.vault-light .req-submit-btn { background: #444; }
.vault-overlay.vault-light .req-submit-btn:hover { background: #222; }

/* ===== 1366×768 LAPTOP OPTIMISATION ===== */
@media (max-width: 1400px) and (min-width: 769px) {
  .page-wrap { padding: 28px 32px 32px; }
  .home-hero { padding: 0 0 22px; }
  .home-layout { gap: 36px; }
  .tools-full-row { padding: 40px 2rem; }
  .about-topics-block { padding: 1.4rem 2rem 1.2rem; }
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) { .vault-grid { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); } }
@media (max-width: 900px) { .vault-cat-sidebar { display: none; } .vault-side-right { display: none; } }

/* ===== TABLET (769px–1024px) ===== */
@media (min-width: 769px) and (max-width: 1024px) {
  /* Header — hide tagline, tighten spacing */
  .site-tagline { display: none; }
  .header-nav a { font-size: 0.82rem; padding: 6px 8px; }
  .a11y-wrap { display: none; }

  /* Page */
  .page-wrap { padding: 24px 24px 28px; }
  .home-layout { gap: 32px; }

  /* Tools split: stack earlier on tablet */
  .tools-split-layout { flex-direction: column; }
  .tools-mascot-col { flex: none; position: static; width: 100%; max-width: 280px; margin: 0 auto; }
  .tools-mascot-desktop { display: none; }
  .tools-mascot-mobile { display: block; }
  .tools-grid-col .home-tools-grid { grid-template-columns: repeat(3, 1fr); }

  /* Vault — hide side panels in grid/play view */
  .vault-side-left { display: none; }
  .vault-side-right { display: none; }
  .vault-sidebar-toggle { display: none; }

  /* Vault grid — tighter cards */
  .vault-grid { grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); grid-auto-rows: 106px; }

  /* Vault topbar — prevent overlap */
  .vault-topbar-center { position: static; transform: none; flex: 1; min-width: 0; }
  #vault-theme-btn { margin-left: 0; }
  .vault-top-games { display: none; }
  .vault-esc-hint { display: none; }

  /* Play view */
  .vault-in-play .vault-topbar-center { flex: 1; min-width: 0; }
  .vault-in-play .vault-search-wrap { min-width: 0; max-width: none; }
}

@media (max-width: 768px) {
  /* Header */
  .header-nav, .site-tagline { display: none; }
  .mob-menu-btn { display: flex; }
  .a11y-wrap { display: none; }
  header { height: 54px; }
  .header-inner { padding: 0 16px; }
  .logo { font-size: 1.15rem; }
  .logo-img { width: 22px; height: 22px; }

  /* Footer — stack vertically, centered */
  footer { height: auto; padding: 20px 16px; }
  .footer-inner { flex-direction: column; align-items: center; gap: 12px; text-align: center; }
  .footer-nav { margin-left: 0; flex-wrap: wrap; gap: 4px; justify-content: center; }
  .footer-nav a { font-size: 0.75rem; padding: 4px 8px; }
  .footer-copy { font-size: 0.75rem; }

  /* Layout */
  .page-wrap { padding: 24px 16px 24px; }
  .home-hero-title { font-size: 1.7rem; }
  .home-article h1 { font-size: 1.4rem; }
  .home-hero { padding: 0 0 28px; }
  .home-hero-desc { font-size: 0.92rem; max-width: 100%; }

  /* Vault topbar — revert search to normal flow on mobile */
  .vault-topbar { position: static; }
  .vault-topbar-center { position: static; transform: none; width: auto; flex: 1; min-width: 0; }
  #vault-theme-btn { margin-left: 0; }
  .vault-top-games { display: none; }
  .vault-esc-hint { display: none; }

  /* Vault play view on mobile — let search fill available space, cancel auto-margin */
  .vault-in-play .vault-topbar-center { flex: 1; min-width: 0; }
  .vault-in-play .vault-search-wrap { min-width: 0; max-width: none; }
  .vault-in-play #vault-theme-btn { margin-left: 0; }

  /* Hide frame back button on mobile — use topbar back button instead */
  #vault-frame-back-btn { display: none !important; }


  /* Vault — mobile: plain 3-col 1:1 grid, no featured cards */
  .vault-grid { grid-template-columns: repeat(3, 1fr); grid-auto-rows: auto; grid-auto-flow: row; }
  .v-card-featured { grid-column: span 1; grid-row: span 1; }
  .v-card { height: auto; }
  .v-thumb { height: auto; aspect-ratio: 1 / 1; }
  .vault-side-left { display: none; }
  .vault-cat-sidebar { display: none; }
  .vault-side-right { display: none; }
  .vault-sidebar-toggle { display: none; }

  /* Other */
  .article-related-grid { grid-template-columns: 1fr 1fr; }
  .use-cases { grid-template-columns: 1fr; }
  .cat-hero { flex-direction: column; gap: 14px; }
  .posts-grid { grid-template-columns: 1fr 1fr; }

  /* Article pages */
  .article-page h1 { font-size: 1.6rem; }
  .article-page { padding-top: 0; }

  /* Body text */
  .article-body, .inner-page p, .article-intro, .home-article p,
  .cat-about p, .article-body p { font-size: 0.92rem; }
}
@media (max-width: 480px) {
  .vault-grid { grid-template-columns: repeat(3, 1fr); grid-auto-rows: auto; }
  .article-related-grid { grid-template-columns: 1fr; }
  .ra-grid { grid-template-columns: 1fr; }
  .article-page h1, .cat-hero h1 { font-size: 1.4rem; }
  .calc-col { max-width: 100%; padding: 0 28px; }
  .home-hero-title { font-size: 1.35rem; }
  .posts-grid { grid-template-columns: 1fr; }
  .logo { font-size: 1.05rem; }
}

/* ===== CALCULATOR THEME SWITCHER ===== */
.calc-theme-row {
  display: flex; gap: 5px; justify-content: center; flex-wrap: nowrap;
  margin-bottom: 20px;
  width: max-content;
  position: relative;
  left: 50%;
  transform: translateX(-50%);
}
.calc-theme-btn {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 6px 12px; border-radius: 999px;
  border: 2px solid var(--border);
  background: var(--card);
  font-size: 0.75rem; font-weight: 500; letter-spacing: 0.3px;
  color: var(--text-muted); cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  outline: none;
  transition: border-color 0.18s ease, color 0.18s ease, background 0.18s ease;
  box-shadow: 0 1px 4px rgba(0,0,0,0.05);
}
.calc-theme-btn:focus { outline: none; }
.calc-clear-all-btn:focus { outline: none; }
.calc-theme-btn:hover { border-color: var(--accent); color: var(--text); }
.calc-theme-btn.active { border-color: var(--accent); color: var(--accent); background: rgba(79,70,229,0.06); }
.calc-theme-dot { width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; }
.calc-theme-btn[data-theme="ios"]     .calc-theme-dot { background: #ff9f0a; }
.calc-theme-btn[data-theme="classic"] .calc-theme-dot { background: #f5a623; }
.calc-theme-btn[data-theme="android"] .calc-theme-dot { background: #4ecdc4; }
.calc-theme-btn[data-theme="minimal"] .calc-theme-dot { background: #6366f1; }
.calc-theme-btn[data-theme="pastel"]  .calc-theme-dot { background: #f08080; }
.calc-theme-btn[data-theme="teal"]    .calc-theme-dot { background: #26d0b2; }
.calc-clear-all-btn {
  display: inline-flex; align-items: center;
  padding: 6px 12px; border-radius: 999px;
  border: 2px solid #e2a0a0;
  background: #fff5f5;
  font-size: 0.75rem; font-weight: 500; letter-spacing: 0.3px;
  color: #c0392b; cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  outline: none;
  transition: background 0.18s ease, border-color 0.18s ease;
  box-shadow: 0 1px 4px rgba(0,0,0,0.05);
}
.calc-clear-all-btn:hover { background: #ffe0e0; border-color: #c0392b; }

@media (max-width: 480px) {
  .calc-theme-row { flex-wrap: wrap; width: 100%; left: 0; transform: none; justify-content: center; gap: 5px; }
  .calc-theme-btn { padding: 6px 12px; font-size: 0.72rem; gap: 4px; }
  .calc-theme-dot { width: 7px; height: 7px; }
  .calc-clear-all-btn { padding: 6px 12px; font-size: 0.72rem; }
}
@media (max-width: 420px) {
  .calc-theme-row { gap: 4px; }
  .calc-theme-btn { padding: 4px 8px; font-size: 0.62rem; gap: 3px; }
  .calc-theme-dot { width: 6px; height: 6px; }
  .calc-clear-all-btn { padding: 4px 8px; font-size: 0.62rem; }
}

/* ===== CLASSIC DARK THEME ===== */
.calc-col[data-calc-theme="classic"] .device-frame {
  background: #1a2038;
  box-shadow: 0 0 0 1px rgba(255,255,255,0.06), 0 18px 48px rgba(0,0,0,0.55), inset 0 1px 0 rgba(255,255,255,0.04);
}
.calc-col[data-calc-theme="classic"] .calc-widget {
  background: #1e2644;
  border-radius: 12px;
  padding: 16px 14px 14px;
}
.calc-col[data-calc-theme="classic"] .cbtn {
  border-radius: 14px;
  background: #2c3560;
  color: #c8d4f0;
  box-shadow: 0 4px 0 rgba(0,0,0,0.35), inset 0 1px 0 rgba(255,255,255,0.08);
}
.calc-col[data-calc-theme="classic"] .cbtn:hover { filter: brightness(1.12); }
.calc-col[data-calc-theme="classic"] .cbtn:active {
  transform: scale(0.95) translateY(2px);
  box-shadow: 0 1px 0 rgba(0,0,0,0.35);
}
.calc-col[data-calc-theme="classic"] .cbtn-fn {
  background: #232b4e;
  color: #8899cc;
  font-size: 0.7rem;
  box-shadow: 0 4px 0 rgba(0,0,0,0.3), inset 0 1px 0 rgba(255,255,255,0.05);
}
.calc-col[data-calc-theme="classic"] .cbtn-cl {
  background: #e84848;
  color: #fff;
  font-size: 1.1rem;
  box-shadow: 0 4px 0 rgba(140,30,30,0.45), inset 0 1px 0 rgba(255,255,255,0.12);
}
.calc-col[data-calc-theme="classic"] .cbtn-op {
  background: #f5a623;
  color: #fff;
  box-shadow: 0 4px 0 rgba(170,100,10,0.45), inset 0 1px 0 rgba(255,255,255,0.15);
}
.calc-col[data-calc-theme="classic"] .cbtn-num {
  background: #2c3560;
  color: #fff;
  font-size: 1.2rem;
  box-shadow: 0 4px 0 rgba(0,0,0,0.35), inset 0 1px 0 rgba(255,255,255,0.08);
}
.calc-col[data-calc-theme="classic"] .cbtn-eq {
  background: #f5a623;
  color: #fff;
  border-radius: 999px;
  box-shadow: 0 4px 0 rgba(170,100,10,0.45), inset 0 1px 0 rgba(255,255,255,0.15);
}
.calc-col[data-calc-theme="classic"] .cbtn-wide2 {
  border-radius: 999px;
  background: #2c3560;
  box-shadow: 0 4px 0 rgba(0,0,0,0.35), inset 0 1px 0 rgba(255,255,255,0.08);
}
.calc-col[data-calc-theme="classic"] .calc-display-wrap {
  background: rgba(0,0,0,0.3);
  border-radius: 10px;
  margin-bottom: 12px;
  padding: 8px 14px 20px;
  border: 1px solid rgba(255,255,255,0.06);
}
.calc-col[data-calc-theme="classic"] .calc-display {
  color: #fff;
  font-size: 3rem;
  letter-spacing: -2px;
}
.calc-col[data-calc-theme="classic"] .calc-expr { color: rgba(200,212,240,0.4); }
.calc-col[data-calc-theme="classic"] .code-toggle-label { color: rgba(200,212,240,0.45); }
.calc-col[data-calc-theme="classic"] .code-toggle-track { background: #2c3560; }

/* ===== ANDROID MINIMAL THEME ===== */
.calc-col[data-calc-theme="android"] .device-frame {
  background: #14141c;
  box-shadow: 0 0 0 1px rgba(255,255,255,0.04), 0 18px 48px rgba(0,0,0,0.6), inset 0 1px 0 rgba(255,255,255,0.03);
}
.calc-col[data-calc-theme="android"] .calc-widget {
  background: #14141c;
  border-radius: 12px;
  padding: 18px 14px 16px;
}
.calc-col[data-calc-theme="android"] .cbtn {
  border-radius: 16px;
  background: rgba(255,255,255,0.07);
  color: #dde0f0;
  border: 1px solid rgba(255,255,255,0.06);
}
.calc-col[data-calc-theme="android"] .cbtn:hover { filter: brightness(1.3); }
.calc-col[data-calc-theme="android"] .cbtn:active { transform: scale(0.93); filter: brightness(0.8); }
.calc-col[data-calc-theme="android"] .cbtn-fn {
  background: rgba(78,205,196,0.08);
  color: #4ecdc4;
  font-size: 0.68rem;
  border: 1px solid rgba(78,205,196,0.15);
}
.calc-col[data-calc-theme="android"] .cbtn-cl {
  background: rgba(78,205,196,0.08);
  color: #4ecdc4;
  font-size: 1rem;
  border: 1px solid rgba(78,205,196,0.15);
}
.calc-col[data-calc-theme="android"] .cbtn-op {
  background: rgba(255,82,82,0.1);
  color: #ff5252;
  font-size: 1.3rem;
  border: 1px solid rgba(255,82,82,0.18);
}
.calc-col[data-calc-theme="android"] .cbtn-num {
  background: rgba(255,255,255,0.07);
  color: #fff;
  font-size: 1.2rem;
}
.calc-col[data-calc-theme="android"] .cbtn-eq {
  background: #ff5252;
  color: #fff;
  border-radius: 999px;
  border: none;
  box-shadow: 0 4px 16px rgba(255,82,82,0.3);
}
.calc-col[data-calc-theme="android"] .cbtn-wide2 {
  border-radius: 999px;
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.06);
}
.calc-col[data-calc-theme="android"] .calc-display-wrap { padding: 8px 14px 20px; }
.calc-col[data-calc-theme="android"] .calc-display {
  color: #fff;
  font-size: 3rem;
  font-weight: 300;
  letter-spacing: -2px;
}
.calc-col[data-calc-theme="android"] .calc-expr { color: rgba(255,255,255,0.3); }
.calc-col[data-calc-theme="android"] .code-toggle-label { color: rgba(221,224,240,0.35); }
.calc-col[data-calc-theme="android"] .code-toggle-track { background: #2c2c38; }

/* ===== MINIMAL LIGHT THEME ===== */
.calc-col[data-calc-theme="minimal"] .device-frame {
  background: #d4dae6;
  box-shadow:
    6px 6px 20px rgba(0,0,0,0.12),
    -3px -3px 12px rgba(255,255,255,0.85),
    0 0 0 1px rgba(0,0,0,0.04);
}
.calc-col[data-calc-theme="minimal"] .calc-widget {
  background: #e4e9f2;
  border-radius: 12px;
  padding: 16px 14px 14px;
}
.calc-col[data-calc-theme="minimal"] .cbtn {
  border-radius: 14px;
  background: #dce2ec;
  color: #1a1a2e;
  box-shadow: 4px 4px 8px rgba(0,0,0,0.13), -3px -3px 7px rgba(255,255,255,0.78);
}
.calc-col[data-calc-theme="minimal"] .cbtn:hover { filter: brightness(1.04); }
.calc-col[data-calc-theme="minimal"] .cbtn:active {
  box-shadow: inset 3px 3px 6px rgba(0,0,0,0.1), inset -1px -1px 4px rgba(255,255,255,0.6);
  transform: scale(0.96);
  filter: none;
}
.calc-col[data-calc-theme="minimal"] .cbtn-fn {
  background: #dce2ec;
  color: #6366f1;
  font-size: 0.68rem;
  box-shadow: 4px 4px 8px rgba(0,0,0,0.1), -2px -2px 6px rgba(255,255,255,0.78);
}
.calc-col[data-calc-theme="minimal"] .cbtn-cl {
  background: #dce2ec;
  color: #f97316;
  font-size: 1rem;
  box-shadow: 4px 4px 8px rgba(0,0,0,0.1), -2px -2px 6px rgba(255,255,255,0.78);
}
.calc-col[data-calc-theme="minimal"] .cbtn-op {
  background: #6366f1;
  color: #fff;
  box-shadow: 4px 4px 10px rgba(79,70,229,0.32), -2px -2px 5px rgba(255,255,255,0.08);
}
.calc-col[data-calc-theme="minimal"] .cbtn-num {
  background: #dce2ec;
  color: #111827;
  font-size: 1.2rem;
  box-shadow: 4px 4px 8px rgba(0,0,0,0.1), -2px -2px 6px rgba(255,255,255,0.78);
}
.calc-col[data-calc-theme="minimal"] .cbtn-eq {
  background: #6366f1;
  color: #fff;
  border-radius: 999px;
  box-shadow: 4px 4px 12px rgba(79,70,229,0.35);
}
.calc-col[data-calc-theme="minimal"] .cbtn-wide2 {
  border-radius: 999px;
  background: #dce2ec;
  box-shadow: 4px 4px 8px rgba(0,0,0,0.1), -2px -2px 6px rgba(255,255,255,0.78);
}
.calc-col[data-calc-theme="minimal"] .calc-display-wrap {
  background: rgba(0,0,0,0.04);
  border-radius: 12px;
  margin-bottom: 12px;
  padding: 8px 14px 20px;
  border: 1px solid rgba(0,0,0,0.05);
  box-shadow: inset 2px 2px 8px rgba(0,0,0,0.07);
}
.calc-col[data-calc-theme="minimal"] .calc-display {
  color: #111827;
  font-size: 3rem;
  font-weight: 300;
  letter-spacing: -2px;
}
.calc-col[data-calc-theme="minimal"] .calc-expr { color: rgba(17,24,39,0.35); }
.calc-col[data-calc-theme="minimal"] .code-toggle-label { color: rgba(17,24,39,0.45); }
.calc-col[data-calc-theme="minimal"] .code-toggle-track { background: #c8d0de; }
.calc-col[data-calc-theme="minimal"] .code-toggle-thumb { background: #9aa5b8; }
.calc-col[data-calc-theme="minimal"] .code-toggle-input:checked + .code-toggle-track { background: #6366f1; }
.calc-col[data-calc-theme="minimal"] .code-toggle-input:checked + .code-toggle-track .code-toggle-thumb { background: #fff; }

/* ===== PASTEL / CANDY THEME ===== */
.calc-col[data-calc-theme="pastel"] .device-frame {
  background: #3a2c24;
  box-shadow: 0 0 0 1px rgba(255,255,255,0.07), 0 18px 48px rgba(0,0,0,0.45), inset 0 1px 0 rgba(255,255,255,0.06);
}
.calc-col[data-calc-theme="pastel"] .calc-widget {
  background: #2e2420;
  border-radius: 12px;
  padding: 14px 12px 12px;
}
/* LCD display — warm amber-green like real calculators */
.calc-col[data-calc-theme="pastel"] .calc-display-wrap {
  background: #d4c9a0;
  border-radius: 8px;
  margin-bottom: 14px;
  padding: 14px 14px 12px;
  min-height: 80px;
  border: 2px solid #b8a870;
  box-shadow: inset 0 3px 10px rgba(0,0,0,0.18), 0 2px 4px rgba(0,0,0,0.2);
}
.calc-col[data-calc-theme="pastel"] .calc-display {
  font-family: 'Courier New', 'JetBrains Mono', monospace;
  color: #2c1e08;
  font-size: 2.4rem;
  font-weight: 700;
  letter-spacing: 3px;
}
.calc-col[data-calc-theme="pastel"] .calc-expr { color: rgba(44,30,8,0.55); font-size: 0.75rem; }
/* Base button */
.calc-col[data-calc-theme="pastel"] .cbtn {
  border-radius: 10px;
  background: #3d302a;
  color: #e8d8cc;
  box-shadow: 0 4px 0 rgba(0,0,0,0.4), inset 0 1px 0 rgba(255,255,255,0.08);
  border: none;
}
.calc-col[data-calc-theme="pastel"] .cbtn:hover { filter: brightness(1.18); }
.calc-col[data-calc-theme="pastel"] .cbtn:active {
  transform: scale(0.95) translateY(2px);
  box-shadow: 0 1px 0 rgba(0,0,0,0.4);
}
/* Function keys — terracotta accent */
.calc-col[data-calc-theme="pastel"] .cbtn-fn {
  background: #5c3d30;
  color: #f4b89a;
  font-size: 0.68rem;
  box-shadow: 0 4px 0 rgba(0,0,0,0.35), inset 0 1px 0 rgba(255,255,255,0.06);
}
/* Control keys — rose */
.calc-col[data-calc-theme="pastel"] .cbtn-cl {
  background: #c0474a;
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  box-shadow: 0 4px 0 rgba(130,30,32,0.5), inset 0 1px 0 rgba(255,255,255,0.12);
}
/* Operator keys — warm amber */
.calc-col[data-calc-theme="pastel"] .cbtn-op {
  background: #d4873a;
  color: #fff;
  font-size: 1.2rem;
  font-weight: 600;
  box-shadow: 0 4px 0 rgba(150,80,20,0.45), inset 0 1px 0 rgba(255,255,255,0.15);
}
/* Number keys — dark warm brown */
.calc-col[data-calc-theme="pastel"] .cbtn-num {
  background: #3d302a;
  color: #f0e0d4;
  font-size: 1.15rem;
  font-weight: 500;
}
/* Equals — deep coral */
.calc-col[data-calc-theme="pastel"] .cbtn-eq {
  background: #c0474a;
  color: #fff;
  border-radius: 999px;
  border: none;
  box-shadow: 0 4px 0 rgba(130,30,32,0.5), inset 0 1px 0 rgba(255,255,255,0.12);
}
.calc-col[data-calc-theme="pastel"] .cbtn-wide2 {
  border-radius: 999px;
  background: #3d302a;
  color: #f0e0d4;
}
.calc-col[data-calc-theme="pastel"] .code-toggle-label { color: rgba(240,224,212,0.45); }
.calc-col[data-calc-theme="pastel"] .code-toggle-track { background: #5c3d30; }
.calc-col[data-calc-theme="pastel"] .code-toggle-thumb { background: #d4873a; }
.calc-col[data-calc-theme="pastel"] .code-toggle-input:checked + .code-toggle-track { background: #c0474a; }
.calc-col[data-calc-theme="pastel"] .code-toggle-input:checked + .code-toggle-track .code-toggle-thumb { background: #fff; }

/* ===== TEAL FLAT THEME ===== */
.calc-col[data-calc-theme="teal"] .device-frame {
  background: #0a0a0a;
  box-shadow: 0 0 0 1px rgba(255,255,255,0.04), 0 18px 48px rgba(0,0,0,0.7), inset 0 1px 0 rgba(255,255,255,0.03);
}
.calc-col[data-calc-theme="teal"] .calc-widget {
  background: #0d0d0d;
  border-radius: 12px;
  padding: 0 2px 2px;
  overflow: hidden;
}
.calc-col[data-calc-theme="teal"] .calc-header {
  background: #0d0d0d;
  padding: 14px 20px 10px;
  min-height: 46px;
}
.calc-col[data-calc-theme="teal"] .calc-display-wrap {
  background: #0d0d0d;
  padding: 6px 20px 22px;
  min-height: 108px;
  border-bottom: 1px solid rgba(38,208,178,0.12);
}
.calc-col[data-calc-theme="teal"] .calc-display {
  color: #fff;
  font-size: 3.2rem;
  font-weight: 700;
  letter-spacing: -2px;
}
.calc-col[data-calc-theme="teal"] .calc-expr {
  color: #26d0b2;
  font-size: 0.88rem;
  font-family: inherit;
}
.calc-col[data-calc-theme="teal"] .calc-grid {
  gap: 1px;
  background: rgba(38,208,178,0.08);
  padding: 0;
}
.calc-col[data-calc-theme="teal"] .cbtn {
  border-radius: 0;
  aspect-ratio: unset;
  height: 58px;
  background: #111919;
  color: #d0eeea;
  font-size: 1.1rem;
  border: none;
}
.calc-col[data-calc-theme="teal"] .cbtn:hover { background: #162322; filter: none; }
.calc-col[data-calc-theme="teal"] .cbtn:active { background: #0d1717; transform: none; filter: none; }
.calc-col[data-calc-theme="teal"] .cbtn-fn {
  background: #0d1717;
  color: #26d0b2;
  font-size: 0.68rem;
}
.calc-col[data-calc-theme="teal"] .cbtn-cl {
  background: #0d1717;
  color: #26d0b2;
  font-size: 1rem;
}
.calc-col[data-calc-theme="teal"] .cbtn-op {
  background: #143330;
  color: #26d0b2;
  font-size: 1.25rem;
}
.calc-col[data-calc-theme="teal"] .cbtn-num {
  background: #111919;
  color: #e8f4f2;
  font-size: 1.2rem;
}
.calc-col[data-calc-theme="teal"] .cbtn-eq {
  background: #26d0b2;
  color: #fff;
  border-radius: 0 0 12px 12px;
  font-size: 1.5rem;
  font-weight: 400;
}
.calc-col[data-calc-theme="teal"] .cbtn-wide2 {
  border-radius: 0;
  aspect-ratio: unset;
  height: 58px;
  background: #111919;
  color: #e8f4f2;
  justify-content: center;
  padding: 0;
}
.calc-col[data-calc-theme="teal"] .cbtn-wide5 {
  border-radius: 0 0 12px 12px;
  height: 58px;
}
.calc-col[data-calc-theme="teal"] .code-toggle-label { color: rgba(208,238,234,0.35); }
.calc-col[data-calc-theme="teal"] .code-toggle-track { background: #143330; }
.calc-col[data-calc-theme="teal"] .code-toggle-thumb { background: #26d0b2; }
.calc-col[data-calc-theme="teal"] .code-toggle-input:checked + .code-toggle-track { background: #26d0b2; }
.calc-col[data-calc-theme="teal"] .code-toggle-input:checked + .code-toggle-track .code-toggle-thumb { background: #fff; }

/* ===== HOME SECTIONS (Tools grid + Topic cards) ===== */
.home-section {
  max-width: 1100px;
  margin: 0 auto;
  padding: 48px 1rem;
}
.home-section-title {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text);
  margin: 0 0 1.1rem;
  letter-spacing: -.01em;
}

/* ── Home Tools Mini-Grid ── */
.home-tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: .9rem;
}
.ht-card {
  display: flex;
  flex-direction: column;
  gap: .45rem;
  background: var(--hc, #6366f1);
  border-radius: 16px;
  padding: 1.15rem 1.1rem 1rem;
  text-decoration: none;
  color: #fff;
  transition: transform .18s, box-shadow .18s, filter .18s;
  position: relative;
  overflow: hidden;
}
.ht-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,.18) 0%, transparent 60%);
  pointer-events: none;
}
.ht-card:hover {
  transform: translateY(-4px);
  filter: brightness(1.08);
  box-shadow: 0 10px 28px rgba(0,0,0,.18);
}
.ht-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .95rem;
  background: #fff;
  flex-shrink: 0;
  color: var(--hc, #6366f1);
}
.ht-name {
  font-size: .88rem;
  font-weight: 800;
  color: #fff;
  line-height: 1.3;
}
.ht-desc {
  font-size: .76rem;
  color: rgba(255,255,255,.82);
  line-height: 1.45;
}

/* ── Home Topic Cards ── */
.home-topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.1rem;
}
.htopic-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  transition: box-shadow .18s, border-color .18s;
}
.htopic-card:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 16px rgba(79,70,229,.1);
}
.htopic-head {
  background: #1e2a4a;
  color: #fff;
  font-size: .9rem;
  font-weight: 800;
  padding: .75rem 1.1rem;
  letter-spacing: .02em;
}
.htopic-list {
  list-style: disc;
  margin: 0;
  padding: .5rem 1rem .7rem 2.2rem;
}
.htopic-list li {
  padding: .18rem 0;
  color: var(--text-muted);
}
.htopic-list li a {
  display: inline;
  font-size: 1.05rem;
  color: var(--text-muted);
  text-decoration: none;
  transition: color .15s;
}
.htopic-list li a:hover {
  color: var(--accent);
  text-decoration: underline;
}

@media (max-width: 600px) {
  .home-tools-grid { grid-template-columns: repeat(2, 1fr); gap: .75rem; }
  .home-topics-grid { grid-template-columns: 1fr; }
}

/* ── Story Section ── */
.home-story-section { }
.home-story-inner {
  max-width: 860px;
  margin: 0 auto;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 36px 40px;
}
.home-story-inner h2 { font-size: 1.35rem; font-weight: 700; color: var(--text); margin: 0 0 18px; }
.home-story-inner p { color: var(--text-muted); font-size: 0.97rem; line-height: 1.75; margin: 0 0 16px; }
.home-story-inner p:last-child { margin-bottom: 0; }
@media (max-width: 600px) {
  .home-story-inner { padding: 24px 20px; }
}

/* ── FAQ Section ── */
.home-faq-section { }
.home-faq-list { display: flex; flex-direction: column; gap: 10px; max-width: 860px; margin: 0 auto; }
.home-faq-item {
  border: 1px solid #b8c5d3;
  border-radius: 10px;
  overflow: hidden;
  background: var(--card-bg);
}
.home-faq-q {
  display: block;
  padding: 16px 20px;
  font-weight: 600;
  font-size: 0.97rem;
  cursor: pointer;
  list-style: none;
  color: var(--text);
  user-select: none;
}
.home-faq-q::-webkit-details-marker { display: none; }
.home-faq-q::after {
  content: '+';
  float: right;
  font-size: 1.2rem;
  color: var(--accent);
  font-weight: 400;
}
.home-faq-item[open] .home-faq-q::after { content: '−'; }
.home-faq-a {
  padding: 0 20px 16px;
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ===== PERFORMANCE: disable expensive backdrop-filter on mobile ===== */
@media (max-width: 768px) {
  header { backdrop-filter: none; background: rgba(255,255,255,0.98); }
}

/* ── Homepage AdsTerra ad placements ── */
.home-native-ad {
  width: 100%; overflow: hidden;
  margin: 0 0 20px;
  min-height: 60px;
}
.home-native-ad-below {
  width: 100%; overflow: hidden;
  margin: 20px 0 0;
  min-height: 60px;
}
.home-banner-300x250 {
  display: flex; align-items: center; justify-content: center;
  margin: 20px auto 0;
  min-height: 250px; width: 300px;
}
.home-banner-160x300 {
  display: flex; align-items: center; justify-content: center;
  margin: 24px auto;
  min-height: 300px; width: 160px;
}
@media (max-width: 600px) {
  .home-banner-300x250 { width: 100%; }
  .home-banner-160x300 { width: 100%; }
}