:root {
  --ink: #17332c;
  --ink-2: #24473e;
  --green: #164b3d;
  --green-deep: #0c3028;
  --green-soft: #dce8df;
  --red: #c64935;
  --red-deep: #a93627;
  --ivory: #f7f1e5;
  --paper: #fffdf7;
  --sand: #e9dcc5;
  --gold: #b69358;
  --muted: #6c7973;
  --line: rgba(23, 51, 44, .14);
  --shadow: 0 24px 70px rgba(12, 48, 40, .13);
  --shadow-soft: 0 12px 36px rgba(12, 48, 40, .09);
  --radius: 26px;
  --radius-sm: 16px;
  --container: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: .26;
  background-image: radial-gradient(rgba(22, 75, 61, .16) .55px, transparent .55px);
  background-size: 8px 8px;
  mask-image: linear-gradient(to bottom, #000, transparent 60%);
  z-index: -1;
}

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input { font: inherit; }
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { line-height: 1.2; letter-spacing: -.035em; }
h1, h2 { font-family: "Songti SC", "STSong", "SimSun", serif; font-weight: 800; }
p { color: var(--muted); }

.container { width: min(calc(100% - 40px), var(--container)); margin-inline: auto; }
.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 1000;
  padding: 10px 16px;
  color: #fff;
  background: var(--red);
  border-radius: 8px;
  transform: translateY(-150%);
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 253, 247, .9);
  border-bottom: 1px solid transparent;
  backdrop-filter: blur(18px);
  transition: border-color .25s, box-shadow .25s;
}
.site-header.is-scrolled { border-bottom-color: var(--line); box-shadow: 0 5px 25px rgba(12, 48, 40, .05); }
.nav-shell { min-height: 78px; display: flex; align-items: center; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 12px; font-weight: 800; font-size: 20px; white-space: nowrap; }
.brand-mark {
  width: 43px;
  height: 43px;
  display: grid;
  place-items: center;
  color: var(--green-deep);
  background: var(--ivory);
  border: 1px solid rgba(182, 147, 88, .7);
  border-radius: 12px;
  font-family: "Songti SC", "STSong", serif;
  font-size: 24px;
  box-shadow: inset 0 -4px 0 rgba(182, 147, 88, .14);
}
.site-nav { margin-left: auto; display: flex; align-items: center; gap: 6px; }
.site-nav a { position: relative; padding: 9px 13px; color: #50625c; font-size: 14px; font-weight: 650; border-radius: 10px; }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--green-deep); background: rgba(22, 75, 61, .07); }
.nav-download { padding: 11px 18px; color: #fff; background: var(--green); border-radius: 12px; font-size: 14px; font-weight: 750; box-shadow: 0 8px 20px rgba(22, 75, 61, .18); }
.nav-download:hover { background: var(--green-deep); transform: translateY(-1px); }
.menu-toggle { display: none; width: 44px; height: 44px; border: 0; background: transparent; color: var(--ink); border-radius: 10px; cursor: pointer; }
.menu-toggle::before, .menu-toggle::after, .menu-toggle span { content: ""; display: block; width: 22px; height: 2px; margin: 5px auto; background: currentColor; transition: .25s; }
.menu-toggle[aria-expanded="true"] span { opacity: 0; }
.menu-toggle[aria-expanded="true"]::before { transform: translateY(7px) rotate(45deg); }
.menu-toggle[aria-expanded="true"]::after { transform: translateY(-7px) rotate(-45deg); }

.hero { position: relative; padding: 76px 0 58px; overflow: hidden; }
.hero::after {
  content: "";
  position: absolute;
  width: 520px;
  height: 520px;
  right: -190px;
  top: -130px;
  border: 1px solid rgba(182, 147, 88, .22);
  border-radius: 50%;
  box-shadow: 0 0 0 80px rgba(182, 147, 88, .04), 0 0 0 160px rgba(182, 147, 88, .03);
  z-index: -1;
}
.hero-grid { display: grid; grid-template-columns: 1.02fr .98fr; gap: 68px; align-items: center; }
.hero-kicker, .eyebrow { margin: 0 0 14px; color: var(--red); font-size: 12px; font-weight: 850; letter-spacing: .18em; text-transform: uppercase; }
.hero h1 { margin-bottom: 22px; font-size: clamp(52px, 6.3vw, 88px); color: var(--green-deep); }
.hero h1 .red { color: var(--red); }
.hero-lead { max-width: 620px; margin-bottom: 32px; font-size: 18px; line-height: 1.85; }
.hero-actions, .button-row { display: flex; flex-wrap: wrap; gap: 13px; align-items: center; }
.button {
  min-height: 52px;
  display: inline-flex;
  justify-content: center;
  align-items: center;
  gap: 9px;
  padding: 13px 24px;
  border: 1px solid transparent;
  border-radius: 13px;
  font-weight: 780;
  line-height: 1.2;
  cursor: pointer;
  transition: transform .2s, background .2s, box-shadow .2s, border-color .2s;
}
.button:hover { transform: translateY(-2px); }
.button-primary { color: #fff; background: var(--red); box-shadow: 0 12px 25px rgba(198, 73, 53, .2); }
.button-primary:hover { background: var(--red-deep); box-shadow: 0 16px 30px rgba(198, 73, 53, .26); }
.button-green { color: #fff; background: var(--green); box-shadow: 0 12px 25px rgba(22, 75, 61, .2); }
.button-green:hover { background: var(--green-deep); }
.button-secondary, .button-outline { color: var(--ink); background: rgba(255,255,255,.5); border-color: var(--line); }
.button-secondary:hover, .button-outline:hover { background: #fff; border-color: rgba(22, 75, 61, .32); }
.button-light { color: var(--green-deep); background: var(--ivory); }
.hero-notes { margin-top: 26px; display: flex; flex-wrap: wrap; gap: 10px 20px; color: #61706b; font-size: 13px; }
.hero-notes span { display: inline-flex; align-items: center; gap: 7px; }
.hero-notes span::before { content: ""; width: 6px; height: 6px; background: var(--gold); border-radius: 50%; }

.table-stage { position: relative; min-height: 540px; display: grid; place-items: center; }
.table-orbit { position: absolute; inset: 5% 0; border: 1px solid rgba(182, 147, 88, .28); border-radius: 50%; transform: rotate(-8deg); }
.table-orbit::before { content: ""; position: absolute; inset: 34px; border: 1px dashed rgba(182, 147, 88, .18); border-radius: inherit; }
.phone {
  position: relative;
  width: 292px;
  height: 548px;
  padding: 12px;
  background: #102822;
  border: 2px solid #355047;
  border-radius: 42px;
  box-shadow: 0 40px 80px rgba(12, 48, 40, .28), inset 0 0 0 1px rgba(255,255,255,.08);
  transform: rotate(4deg);
  z-index: 2;
}
.phone::before { content: ""; position: absolute; width: 80px; height: 21px; top: 13px; left: 50%; transform: translateX(-50%); background: #102822; border-radius: 0 0 13px 13px; z-index: 2; }
.phone-screen { height: 100%; overflow: hidden; color: #fff; background: linear-gradient(155deg, #276957, #0b332a 68%); border-radius: 31px; }
.phone-top { padding: 39px 20px 17px; display: flex; justify-content: space-between; align-items: center; font-size: 12px; color: rgba(255,255,255,.75); }
.phone-logo { font-family: "Songti SC", "STSong", serif; font-size: 22px; font-weight: 800; color: #fff6de; }
.phone-banner { margin: 0 15px; padding: 18px; color: var(--ink); background: var(--ivory); border-radius: 17px; box-shadow: 0 12px 22px rgba(0,0,0,.16); }
.phone-banner small { display: block; color: var(--red); font-size: 10px; font-weight: 850; letter-spacing: .12em; }
.phone-banner strong { display: block; margin: 5px 0 2px; font-family: "Songti SC", "STSong", serif; font-size: 23px; }
.phone-banner span { color: #68756e; font-size: 11px; }
.phone-section-title { padding: 19px 18px 10px; display: flex; justify-content: space-between; align-items: center; font-size: 13px; font-weight: 800; }
.phone-section-title span { color: rgba(255,255,255,.55); font-size: 10px; font-weight: 500; }
.phone-room-grid { padding: 0 14px; display: grid; grid-template-columns: 1fr 1fr; gap: 9px; }
.phone-room { min-height: 78px; padding: 11px; display: flex; flex-direction: column; justify-content: flex-end; background: rgba(255,255,255,.09); border: 1px solid rgba(255,255,255,.09); border-radius: 13px; }
.phone-room b { color: #fff9e9; font-size: 13px; }
.phone-room small { color: rgba(255,255,255,.56); font-size: 9px; }
.phone-tabs { position: absolute; left: 24px; right: 24px; bottom: 20px; padding: 10px 16px; display: flex; justify-content: space-between; color: rgba(255,255,255,.45); background: rgba(5, 26, 21, .8); border-radius: 16px; font-size: 9px; }
.phone-tabs .active { color: #ffdabc; }
.tile {
  position: absolute;
  width: 76px;
  height: 95px;
  display: grid;
  place-items: center;
  color: var(--green);
  background: linear-gradient(145deg, #fffdf6, #e9ddc8);
  border: 1px solid #d8c7aa;
  border-radius: 12px;
  box-shadow: 0 13px 22px rgba(12,48,40,.18), inset 0 -7px 0 #d3c19f;
  font-family: "Songti SC", "STSong", serif;
  font-size: 35px;
  font-weight: 800;
  z-index: 3;
}
.tile-red { color: var(--red); }
.tile-a { left: 18px; top: 84px; transform: rotate(-13deg); }
.tile-b { right: 1px; top: 120px; transform: rotate(15deg); }
.tile-c { left: 70px; bottom: 36px; transform: rotate(-9deg); }
.tile-d { right: 33px; bottom: 55px; transform: rotate(8deg); }

.trust-strip { position: relative; z-index: 5; }
.trust-grid { display: grid; grid-template-columns: repeat(4, 1fr); color: #e9f3ed; background: var(--green-deep); border-radius: 20px; box-shadow: var(--shadow); overflow: hidden; }
.trust-item { position: relative; padding: 23px 25px; }
.trust-item + .trust-item::before { content: ""; position: absolute; left: 0; top: 24%; bottom: 24%; width: 1px; background: rgba(255,255,255,.13); }
.trust-item strong { display: block; color: #fff; font-size: 16px; }
.trust-item span { color: rgba(255,255,255,.58); font-size: 12px; }

.section { padding: 100px 0; }
.section-compact { padding: 64px 0; }
.section-tint { background: var(--ivory); }
.section-green { color: #fff; background: var(--green-deep); }
.section-heading { max-width: 680px; margin-bottom: 44px; }
.section-heading.centered { margin-inline: auto; text-align: center; }
.section-heading h2 { margin-bottom: 15px; font-size: clamp(36px, 4.4vw, 56px); color: var(--green-deep); }
.section-heading p:last-child { margin-bottom: 0; font-size: 17px; }
.section-green .section-heading h2, .section-green h2, .section-green h3 { color: #fff; }
.section-green p { color: rgba(255,255,255,.65); }

.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.feature-card { position: relative; min-height: 245px; padding: 29px; background: rgba(255,255,255,.68); border: 1px solid rgba(22,75,61,.11); border-radius: var(--radius-sm); overflow: hidden; transition: transform .25s, box-shadow .25s, border-color .25s; }
.feature-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-soft); border-color: rgba(22,75,61,.25); }
.feature-card::after { content: attr(data-mark); position: absolute; right: -8px; bottom: -35px; color: rgba(22,75,61,.055); font-family: "Songti SC", serif; font-size: 120px; font-weight: 900; line-height: 1; }
.feature-index { display: inline-grid; place-items: center; width: 42px; height: 42px; margin-bottom: 27px; color: var(--red); background: rgba(198,73,53,.09); border-radius: 12px; font-weight: 850; font-size: 13px; }
.feature-card h3 { margin-bottom: 10px; font-size: 22px; }
.feature-card p { position: relative; z-index: 1; margin: 0; font-size: 14px; }

.play-showcase { display: grid; grid-template-columns: 1fr 1.08fr; gap: 70px; align-items: center; }
.mahjong-board { position: relative; min-height: 460px; padding: 44px; display: flex; flex-direction: column; justify-content: space-between; color: #fff; background: radial-gradient(circle at 50% 42%, #236955, #0b332a 70%); border: 11px solid #183f35; border-radius: 44px; box-shadow: var(--shadow); overflow: hidden; }
.mahjong-board::before { content: ""; position: absolute; width: 250px; height: 250px; left: 50%; top: 50%; transform: translate(-50%,-50%); border: 1px solid rgba(255,255,255,.11); border-radius: 50%; box-shadow: 0 0 0 38px rgba(255,255,255,.025); }
.board-status { position: relative; z-index: 1; display: flex; justify-content: space-between; color: rgba(255,255,255,.65); font-size: 12px; }
.board-center { position: relative; z-index: 1; width: 102px; height: 102px; margin: auto; display: grid; place-items: center; background: rgba(5,27,22,.48); border: 1px solid rgba(255,255,255,.12); border-radius: 22px; transform: rotate(45deg); }
.board-center span { color: #ffe7b3; font-family: "Songti SC", serif; font-size: 29px; transform: rotate(-45deg); }
.hand { position: relative; z-index: 1; display: flex; justify-content: center; gap: 5px; }
.mini-tile { width: 39px; height: 55px; display: grid; place-items: center; color: var(--green); background: linear-gradient(#fffdf8,#e9ddca); border-radius: 5px; box-shadow: inset 0 -4px 0 #c9b691, 0 4px 8px rgba(0,0,0,.2); font-family: "Songti SC", serif; font-size: 17px; font-weight: 800; }
.mini-tile.red { color: var(--red); }
.content-list { margin: 31px 0 34px; padding: 0; list-style: none; }
.content-list li { display: grid; grid-template-columns: 44px 1fr; gap: 16px; padding: 18px 0; border-bottom: 1px solid var(--line); }
.content-list b { width: 37px; height: 37px; display: grid; place-items: center; color: #fff; background: var(--green); border-radius: 50%; font-size: 13px; }
.content-list strong { display: block; margin-bottom: 2px; }
.content-list span { color: var(--muted); font-size: 14px; }

.mode-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.mode-card { padding: 29px 24px; color: var(--ink); background: var(--paper); border-radius: var(--radius-sm); }
.mode-mark { width: 56px; height: 65px; margin-bottom: 22px; display: grid; place-items: center; color: var(--red); background: var(--ivory); border: 1px solid #d8c7aa; border-radius: 8px; box-shadow: inset 0 -5px 0 #d8c7aa; font-family: "Songti SC", serif; font-size: 26px; font-weight: 900; }
.mode-card h3 { margin-bottom: 8px; font-size: 20px; }
.mode-card p { margin-bottom: 0; font-size: 13px; }

.download-panel { padding: 48px 54px; display: flex; justify-content: space-between; gap: 36px; align-items: center; color: #fff; background: var(--green-deep); border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden; position: relative; }
.download-panel::after { content: "闲"; position: absolute; right: 180px; top: -62px; color: rgba(255,255,255,.04); font-family: "Songti SC", serif; font-size: 230px; font-weight: 900; }
.download-panel > * { position: relative; z-index: 1; }
.download-panel h2 { margin-bottom: 9px; color: #fff; font-size: clamp(31px,4vw,48px); }
.download-panel p { margin: 0; color: rgba(255,255,255,.62); }
.download-meta { margin-top: 18px; display: flex; flex-wrap: wrap; gap: 8px; }
.download-meta span { padding: 5px 10px; color: rgba(255,255,255,.72); background: rgba(255,255,255,.08); border-radius: 999px; font-size: 11px; }

.content-hero { padding: 70px 0 62px; background: var(--ivory); border-bottom: 1px solid rgba(22,75,61,.08); }
.breadcrumbs { margin-bottom: 35px; display: flex; gap: 10px; color: #82908b; font-size: 12px; }
.breadcrumbs a:hover { color: var(--red); }
.content-hero-grid { display: grid; grid-template-columns: 1fr .6fr; gap: 50px; align-items: end; }
.content-hero h1 { max-width: 820px; margin-bottom: 17px; color: var(--green-deep); font-size: clamp(46px,6vw,74px); }
.content-hero p:last-child { max-width: 700px; margin: 0; font-size: 17px; }
.hero-stamp { justify-self: end; width: 150px; height: 150px; display: grid; place-items: center; color: var(--red); border: 2px solid rgba(198,73,53,.5); outline: 1px solid rgba(198,73,53,.25); outline-offset: -9px; border-radius: 50%; font-family: "Songti SC", serif; font-size: 54px; font-weight: 900; transform: rotate(7deg); }

.content-layout { display: grid; grid-template-columns: minmax(0, 1fr) 270px; gap: 70px; align-items: start; }
.article h2 { margin-top: 55px; margin-bottom: 17px; color: var(--green-deep); font-size: 34px; }
.article h2:first-child { margin-top: 0; }
.article h3 { margin-top: 28px; margin-bottom: 10px; font-size: 22px; }
.article p { margin-bottom: 18px; }
.article-lead { padding: 25px 28px; color: var(--ink-2) !important; background: var(--ivory); border-left: 4px solid var(--red); border-radius: 0 13px 13px 0; font-size: 17px; }
.aside-card { position: sticky; top: 104px; padding: 25px; background: var(--ivory); border: 1px solid var(--line); border-radius: var(--radius-sm); }
.aside-card h2 { margin-bottom: 16px; font-family: inherit; font-size: 15px; }
.aside-links { display: grid; gap: 4px; }
.aside-links a { padding: 9px 11px; color: var(--muted); border-radius: 8px; font-size: 13px; }
.aside-links a:hover, .aside-links a[aria-current="page"] { color: var(--green-deep); background: #fff; }
.aside-card .button { width: 100%; min-height: 46px; margin-top: 18px; padding: 10px 14px; font-size: 13px; }

.rule-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin: 28px 0; }
.rule-card { padding: 26px; background: var(--ivory); border: 1px solid var(--line); border-radius: 14px; }
.rule-card h3 { margin-top: 0; }
.rule-card p { margin: 0; font-size: 14px; }
.step-list { margin: 28px 0; padding: 0; list-style: none; counter-reset: steps; }
.step-list li { counter-increment: steps; position: relative; min-height: 82px; padding: 0 0 28px 68px; }
.step-list li::before { content: counter(steps); position: absolute; left: 0; top: 0; width: 44px; height: 44px; display: grid; place-items: center; color: #fff; background: var(--green); border-radius: 14px; font-weight: 850; }
.step-list li:not(:last-child)::after { content: ""; position: absolute; left: 21px; top: 49px; bottom: 5px; width: 1px; background: var(--line); }
.step-list strong { display: block; margin-bottom: 4px; font-size: 17px; }
.step-list span { color: var(--muted); font-size: 14px; }
.info-table { width: 100%; margin: 25px 0; border-collapse: collapse; border-radius: 14px; overflow: hidden; box-shadow: 0 0 0 1px var(--line); }
.info-table th, .info-table td { padding: 15px 18px; border-bottom: 1px solid var(--line); text-align: left; font-size: 14px; }
.info-table tr:last-child th, .info-table tr:last-child td { border-bottom: 0; }
.info-table th { width: 34%; color: var(--ink); background: var(--ivory); }
.info-table td { color: var(--muted); background: #fff; word-break: break-word; }

.download-box { margin: 30px 0; padding: 35px; display: grid; grid-template-columns: 1fr auto; gap: 28px; align-items: center; color: #fff; background: var(--green-deep); border-radius: 19px; }
.download-box h2 { margin: 0 0 8px; color: #fff; font-size: 30px; }
.download-box p { margin: 0; color: rgba(255,255,255,.62); font-size: 14px; }
.download-box .button { min-width: 180px; }
.apk-path { margin-top: 18px; padding: 12px 14px; color: #d7e6df; background: rgba(0,0,0,.16); border-radius: 9px; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 11px; word-break: break-all; }

.faq-list { display: grid; gap: 12px; }
.faq-list details { background: #fff; border: 1px solid var(--line); border-radius: 14px; overflow: hidden; }
.faq-list summary { position: relative; padding: 20px 54px 20px 22px; color: var(--ink); font-weight: 750; cursor: pointer; list-style: none; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: "+"; position: absolute; right: 20px; top: 50%; transform: translateY(-50%); color: var(--red); font-size: 25px; font-weight: 400; }
.faq-list details[open] summary::after { content: "−"; }
.faq-answer { padding: 0 22px 21px; }
.faq-answer p { margin: 0; font-size: 14px; }

.seo-links { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 32px; }
.seo-links a { padding: 7px 12px; color: var(--green); background: var(--ivory); border-radius: 999px; font-size: 12px; }
.seo-links a:hover { color: #fff; background: var(--green); }

.site-footer { padding: 64px 0 95px; color: rgba(255,255,255,.66); background: #08241e; }
.footer-grid { display: grid; grid-template-columns: 1.4fr .7fr .7fr; gap: 60px; }
.site-footer .brand { color: #fff; }
.site-footer .brand-mark { color: #fff; background: rgba(255,255,255,.08); border-color: rgba(255,255,255,.18); box-shadow: none; }
.footer-intro { max-width: 430px; margin: 18px 0 0; color: rgba(255,255,255,.48); font-size: 13px; }
.footer-column h2 { margin-bottom: 17px; color: #fff; font-family: inherit; font-size: 14px; letter-spacing: 0; }
.footer-links { display: grid; gap: 9px; }
.footer-links a { color: rgba(255,255,255,.5); font-size: 13px; }
.footer-links a:hover { color: #fff; }
.footer-bottom { margin-top: 48px; padding-top: 23px; display: flex; justify-content: space-between; gap: 20px; border-top: 1px solid rgba(255,255,255,.09); color: rgba(255,255,255,.36); font-size: 11px; }
.mobile-download-bar { display: none; }
.back-to-top { position: fixed; right: 20px; bottom: 22px; z-index: 50; width: 42px; height: 42px; color: #fff; background: var(--green); border: 0; border-radius: 50%; box-shadow: var(--shadow-soft); cursor: pointer; opacity: 0; pointer-events: none; transform: translateY(8px); transition: .25s; }
.back-to-top.is-visible { opacity: 1; pointer-events: auto; transform: translateY(0); }

@media (max-width: 1050px) {
  .site-nav a { padding-inline: 8px; }
  .hero-grid { gap: 30px; }
  .table-stage { transform: scale(.9); margin-inline: -25px; }
  .play-showcase { gap: 45px; }
}

@media (max-width: 900px) {
  .site-header .nav-shell { min-height: 68px; }
  .menu-toggle { display: block; margin-left: auto; }
  .nav-download { display: none; }
  .site-nav { position: absolute; left: 20px; right: 20px; top: 64px; padding: 10px; display: grid; gap: 3px; background: var(--paper); border: 1px solid var(--line); border-radius: 14px; box-shadow: var(--shadow); opacity: 0; pointer-events: none; transform: translateY(-8px); transition: .2s; }
  .site-nav.is-open { opacity: 1; pointer-events: auto; transform: translateY(0); }
  .site-nav a { padding: 12px 13px; }
  .hero { padding-top: 50px; }
  .hero-grid, .play-showcase, .content-hero-grid { grid-template-columns: 1fr; }
  .hero-copy { text-align: center; }
  .hero-lead { margin-inline: auto; }
  .hero-actions, .hero-notes { justify-content: center; }
  .table-stage { min-height: 520px; transform: scale(.88); margin-top: -20px; }
  .trust-grid { grid-template-columns: 1fr 1fr; }
  .trust-item:nth-child(3)::before { display: none; }
  .feature-grid { grid-template-columns: 1fr 1fr; }
  .mode-grid { grid-template-columns: 1fr 1fr; }
  .play-showcase > div:last-child { order: -1; }
  .content-layout { grid-template-columns: 1fr; gap: 40px; }
  .aside-card { position: static; }
  .hero-stamp { display: none; }
  .footer-grid { grid-template-columns: 1.2fr .7fr .7fr; gap: 30px; }
}

@media (max-width: 640px) {
  body { padding-bottom: 76px; }
  .container { width: min(calc(100% - 28px), var(--container)); }
  .brand { font-size: 18px; }
  .brand-mark { width: 39px; height: 39px; font-size: 21px; }
  .hero { padding: 38px 0 35px; }
  .hero h1 { font-size: 49px; }
  .hero-lead { font-size: 15px; }
  .hero-actions .button { width: 100%; }
  .hero-notes { gap: 6px 12px; }
  .table-stage { min-height: 430px; transform: scale(.73); margin: -42px -70px -38px; }
  .trust-grid { grid-template-columns: 1fr; border-radius: 16px; }
  .trust-item { padding: 18px 21px; }
  .trust-item + .trust-item::before { left: 21px; right: 21px; top: 0; bottom: auto; width: auto; height: 1px; }
  .trust-item:nth-child(3)::before { display: block; }
  .section { padding: 72px 0; }
  .section-compact { padding: 45px 0; }
  .section-heading { margin-bottom: 31px; }
  .section-heading h2 { font-size: 38px; }
  .section-heading p:last-child { font-size: 15px; }
  .feature-grid, .mode-grid, .rule-grid { grid-template-columns: 1fr; }
  .feature-card { min-height: 220px; }
  .mahjong-board { min-height: 330px; padding: 28px 12px; border-width: 8px; border-radius: 30px; }
  .mini-tile { width: 29px; height: 43px; font-size: 13px; }
  .download-panel { padding: 34px 25px; display: block; }
  .download-panel h2 { font-size: 34px; }
  .download-panel .button { width: 100%; margin-top: 25px; }
  .content-hero { padding: 46px 0 42px; }
  .breadcrumbs { margin-bottom: 25px; }
  .content-hero h1 { font-size: 44px; }
  .content-hero p:last-child { font-size: 15px; }
  .article h2 { margin-top: 42px; font-size: 29px; }
  .article-lead { padding: 20px; font-size: 15px; }
  .info-table th, .info-table td { display: block; width: 100%; padding: 10px 14px; }
  .info-table th { padding-bottom: 2px; border-bottom: 0; }
  .info-table td { padding-top: 3px; }
  .download-box { padding: 27px 22px; grid-template-columns: 1fr; }
  .download-box .button { width: 100%; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
  .footer-bottom { display: block; }
  .footer-bottom span { display: block; margin-top: 5px; }
  .mobile-download-bar { position: fixed; left: 0; right: 0; bottom: 0; z-index: 90; min-height: 70px; padding: 9px 14px calc(9px + env(safe-area-inset-bottom)); display: flex; justify-content: space-between; align-items: center; gap: 10px; background: rgba(8,36,30,.96); box-shadow: 0 -10px 30px rgba(0,0,0,.16); backdrop-filter: blur(12px); }
  .mobile-download-bar strong, .mobile-download-bar span { display: block; }
  .mobile-download-bar strong { color: #fff; font-size: 13px; }
  .mobile-download-bar span { color: rgba(255,255,255,.5); font-size: 10px; }
  .mobile-download-bar .button { min-height: 43px; padding: 10px 16px; font-size: 12px; }
  .back-to-top { bottom: 91px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}