/* Mahjong Academy — site styles
   Theme: warm paper + jade green + mahjong red. Light theme fixed (hygiene contrast). */
:root {
  --accent: #1E6B4E;
  --accent-dark: #155239;
  --accent-soft: #E7F1EC;
  --red: #B3382F;
  --bg: #FAF6EE;
  --card: #FFFFFF;
  --border: #E4DCCB;
  --text: #24312B;
  --muted: #5C6B63;
  --felt: #0F3D2E;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 16px/1.65 "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
:focus-visible { outline: 3px solid #7FB5A0; outline-offset: 2px; border-radius: 4px; }

/* nav */
.nav { position: sticky; top: 0; z-index: 50; background: #FFFFFFF2; border-bottom: 1px solid var(--border); backdrop-filter: blur(6px); }
.nav-in { max-width: 960px; margin: 0 auto; display: flex; align-items: center; gap: 18px; padding: 10px 20px; overflow-x: auto; white-space: nowrap; }
.brand { display: flex; align-items: center; gap: 9px; font-weight: 700; font-size: 17px; color: var(--text); }
.brand:hover { text-decoration: none; }
.brand svg { display: block; }
.nav-links { display: flex; gap: 4px; margin-left: auto; }
@media (max-width: 760px) {
  .nav-in { flex-wrap: wrap; white-space: normal; }
  .nav-links { margin-left: 0; flex-wrap: wrap; width: 100%; }
}
.nav-links a { padding: 7px 11px; border-radius: 8px; color: var(--muted); font-size: 14.5px; font-weight: 600; }
.nav-links a:hover { background: var(--accent-soft); color: var(--accent-dark); text-decoration: none; }
.nav-links a.on { color: var(--accent-dark); background: var(--accent-soft); }

.wrap { max-width: 840px; margin: 0 auto; padding: 0 20px; }
.wrap-wide { max-width: 1000px; margin: 0 auto; padding: 0 20px; }

/* hero */
.hero { padding: 52px 0 34px; }
.hero h1 { font-size: clamp(2rem, 4.6vw, 2.75rem); line-height: 1.15; margin: 0 0 14px; letter-spacing: -0.5px; }
.hero .sub { font-size: 18px; color: var(--muted); max-width: 640px; margin: 0 0 22px; }
.hero.slim { padding: 34px 0 10px; }
.hero-art { margin-top: 20px; }
.hero-art svg.fan { height: 175px; width: auto; display: block; filter: drop-shadow(0 4px 10px rgba(36,49,43,.22)); }
@media (max-width: 760px) {
  .hero-art svg.fan { height: 190px; }
  .hero .sub { display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
  .hero-img { min-height: 300px; object-fit: cover; }
}
.hero-img { width: 100%; height: auto; display: block; border-radius: 18px; }
.trustrow { display: flex; flex-wrap: wrap; gap: 8px 18px; margin: 0 0 8px; padding: 0; list-style: none; }
.trustrow li { font-size: 14px; font-weight: 600; color: var(--accent-dark); }
.trustrow li::before { content: "✓ "; color: var(--accent); }

.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin: 20px 0 6px; }
.btn {
  display: inline-block; padding: 13px 24px; border-radius: 12px; font-weight: 700; font-size: 16px;
  border: 1px solid transparent; cursor: pointer; transition: transform .15s ease, box-shadow .15s ease, background .15s ease;
}
.btn:active { transform: scale(.97); }
.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 2px 8px rgba(30,107,78,.25); }
.btn-primary:hover { background: var(--accent-dark); text-decoration: none; }
.btn-ghost { background: #fff; border-color: var(--border); color: var(--accent-dark); }
.btn-ghost:hover { border-color: var(--accent); text-decoration: none; }

/* cards & sections */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 14px; margin: 22px 0; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 18px; display: block; color: var(--text); transition: border-color .15s, transform .15s; }
.card:hover { border-color: var(--accent); text-decoration: none; transform: translateY(-2px); }
.card b { display: block; margin-bottom: 6px; font-size: 16.5px; color: var(--accent-dark); }
.card span { font-size: 14px; color: var(--muted); }
.card .kw { display: inline-block; margin-top: 10px; font-size: 12.5px; color: var(--accent); font-weight: 700; }

section.band { margin: 34px 0; }
h2 { font-size: 1.55rem; line-height: 1.25; margin: 38px 0 12px; letter-spacing: -0.3px; }
h3 { font-size: 1.15rem; margin: 24px 0 8px; }
.prose p { margin: 0 0 14px; }
.prose ul, .prose ol { margin: 0 0 14px; padding-left: 24px; }
.prose li { margin-bottom: 6px; }
.lead { font-size: 17.5px; color: #3D4B44; }

/* tables */
.tbl-wrap { overflow-x: auto; margin: 18px 0; border: 1px solid var(--border); border-radius: 12px; background: #fff; }
table.dtable { border-collapse: collapse; width: 100%; min-width: 560px; font-size: 14.5px; }
.dtable th { background: var(--accent-soft); color: var(--accent-dark); text-align: left; padding: 10px 12px; white-space: nowrap; font-size: 13.5px; }
.dtable td { padding: 9px 12px; border-top: 1px solid var(--border); vertical-align: top; }
.dtable td.num { white-space: nowrap; font-variant-numeric: tabular-nums; }

/* steps */
.steps { counter-reset: st; margin: 18px 0; padding: 0; list-style: none; }
.steps li { position: relative; padding: 0 0 16px 52px; margin: 0; }
.steps li::before {
  counter-increment: st; content: counter(st);
  position: absolute; left: 0; top: 0; width: 34px; height: 34px; border-radius: 10px;
  background: var(--accent); color: #fff; font-weight: 700; display: flex; align-items: center; justify-content: center; font-size: 16px;
}
.steps b { display: block; margin-bottom: 2px; }

/* figures (shared infographic language, adapted to warm theme) */
.ig { margin: 26px 0; background: #fff; border: 1px solid var(--border); border-radius: 16px; padding: 14px; max-width: 100%; }
.ig img { width: 100%; height: auto; display: block; }
.ig figcaption { text-align: center; font-size: 13px; color: var(--muted); margin-top: 8px; }

/* tile strip: inline original SVG tiles */
.tilestrip { display: flex; flex-wrap: wrap; gap: 7px; align-items: flex-end; margin: 16px 0; }
.tilestrip svg { display: block; filter: drop-shadow(0 1px 2px rgba(36,49,43,.18)); }

/* callouts */
.note { background: var(--accent-soft); border: 1px solid #CFE3DA; border-radius: 12px; padding: 13px 16px; margin: 16px 0; font-size: 15px; }
.warn { background: #FBEFEC; border: 1px solid #EBCFCA; border-radius: 12px; padding: 13px 16px; margin: 16px 0; font-size: 15px; }

/* FAQ */
.faq .qa { background: #fff; border: 1px solid var(--border); border-radius: 12px; padding: 14px 18px; margin-bottom: 10px; }
.faq h3 { margin: 0 0 6px; font-size: 15.5px; }
.faq p { margin: 0; font-size: 15px; color: #3D4B44; }

/* related */
.related { margin: 40px 0 10px; }
.rgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; }
.rcard { background: #fff; border: 1px solid var(--border); border-radius: 12px; padding: 14px 16px; display: flex; justify-content: space-between; align-items: center; gap: 8px; color: var(--text); font-size: 14.5px; transition: border-color .15s; }
.rcard:hover { border-color: var(--accent); text-decoration: none; }
.rcard span { color: var(--accent); font-weight: 700; white-space: nowrap; }

/* game */
.game-shell { background: var(--felt); border-radius: 18px; padding: 16px; margin: 20px 0; box-shadow: inset 0 0 0 1px rgba(255,255,255,.06), 0 6px 20px rgba(15,61,46,.35); }
#board { width: 100%; height: auto; display: block; border-radius: 10px; touch-action: manipulation; cursor: pointer; }
.game-bar { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-top: 12px; }
.gbtn { padding: 11px 16px; min-height: 44px; border-radius: 10px; border: 1px solid rgba(255,255,255,.25); background: #FFFFFF14; color: #F2EFE6; font-weight: 700; font-size: 14.5px; cursor: pointer; transition: background .15s, transform .15s; }
.gbtn:hover { background: #FFFFFF2E; }
.gbtn:active { transform: scale(.97); }
.gbtn:disabled { opacity: .45; cursor: default; }
.gstats { margin-left: auto; display: flex; gap: 16px; color: #D9E6DF; font-size: 14px; font-variant-numeric: tabular-nums; }
.gstats b { color: #fff; }
.gmsg { min-height: 24px; margin-top: 10px; color: #F2EFE6; font-size: 14.5px; font-weight: 600; }
.gmsg.err { color: #F4C7C3; }

/* calculator */
.calc { background: #fff; border: 1px solid var(--border); border-radius: 16px; padding: 20px; margin: 20px 0; }
.calc-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 14px; }
.field label { display: block; font-size: 13px; font-weight: 700; color: var(--muted); margin-bottom: 6px; text-transform: uppercase; letter-spacing: .4px; }
.field input[type=number], .field select {
  width: 100%; padding: 11px 12px; border: 1.5px solid var(--border); border-radius: 10px; font-size: 16px; background: #FCFAF5; color: var(--text);
}
.field input:focus, .field select:focus { border-color: var(--accent); outline: none; }
.checks { display: flex; flex-wrap: wrap; gap: 10px 20px; margin: 14px 0 4px; }
.checks label { display: flex; align-items: center; gap: 8px; font-size: 15px; font-weight: 600; cursor: pointer; }
.checks input { width: 18px; height: 18px; accent-color: var(--accent); }
.calc-out { margin-top: 16px; border-top: 2px dashed var(--border); padding-top: 14px; }
.out-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 10px; }
.out-cell { background: var(--accent-soft); border-radius: 10px; padding: 10px 12px; }
.out-cell .lab { font-size: 12px; font-weight: 700; color: var(--accent-dark); text-transform: uppercase; letter-spacing: .4px; }
.out-cell .val { font-size: 20px; font-weight: 800; color: var(--text); font-variant-numeric: tabular-nums; min-height: 30px; }
.calc-err { color: var(--red); font-size: 14px; font-weight: 600; min-height: 20px; margin-top: 8px; }
.copywrap { margin-top: 12px; position: relative; display: inline-grid; }
.copywrap .btn { grid-area: 1 / 1; }
.copy-states { grid-area: 1 / 1; display: grid; justify-items: center; pointer-events: none; }
.copy-states span { grid-area: 1 / 1; display: flex; align-items: center; justify-content: center; padding: 13px 24px; border-radius: 12px; font-weight: 700; font-size: 16px; opacity: 0; transition: opacity .15s; pointer-events: none; }
.copywrap.copied .copy-states span { opacity: 1; }
.copywrap.copied .btn-primary { opacity: 0; }
.copy-states span { background: var(--accent-dark); color: #fff; }

/* glossary */
.gloss dt { font-weight: 700; color: var(--accent-dark); margin-top: 14px; }
.gloss dd { margin: 2px 0 0 0; font-size: 15px; color: #3D4B44; }

/* footer */
footer.site { margin-top: 60px; background: #103826; color: #C9D8CF; }
.foot-in { max-width: 960px; margin: 0 auto; padding: 36px 20px 28px; display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 28px; font-size: 14px; }
.foot-in h4 { color: #fff; margin: 0 0 10px; font-size: 14px; }
.foot-in a { color: #C9D8CF; display: block; padding: 3px 0; }
.foot-in a:hover { color: #fff; }
.foot-brand p { margin: 8px 0 0; line-height: 1.6; }
.foot-base { border-top: 1px solid #23543F; padding: 14px 20px; text-align: center; font-size: 13px; color: #9DB4A7; }

@media (max-width: 760px) {
  .foot-in { grid-template-columns: 1fr 1fr; }
  .foot-brand { grid-column: 1 / -1; }
  .hero { padding: 36px 0 24px; }
  .gstats { width: 100%; margin-left: 0; justify-content: space-between; }
}
@media (max-width: 480px) {
  .foot-in { grid-template-columns: 1fr; }
  .btn { width: 100%; text-align: center; }
  .copywrap { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
  .card:hover, .rcard:hover { transform: none; }
}

.ig{margin:26px 0;background:#fff;border:1px solid #E5E7EB;border-radius:16px;padding:14px;max-width:100%}.ig img{width:100%;height:auto;display:block}.ig figcaption{text-align:center;font-size:13px;color:#6B7280;margin-top:8px}@media (prefers-color-scheme:dark){.ig{background:#111827;border-color:#374151}.ig figcaption{color:#9CA3AF}}