/* ==========================================================================
   华悦棋牌 · 共享站点样式  /assets/site.css
   设计语言：热带夜航 · 框景牌桌 · 展览标签
   ========================================================================== */

/* --------------------------------------------------------------------------
   0. 设计变量
   -------------------------------------------------------------------------- */
:root {
  /* 品牌色板 */
  --deep-sea: #0B1E2D;
  --night-blue: #122E45;
  --board-teal: #1C3B4A;
  --palm-green: #2F7D5B;
  --palm-light: #6FC79A;
  --felt-red: #8E2B3A;
  --coin-gold: #C9A227;
  --sand-white: #F2EFE6;
  --mist-blue: #7C93A3;

  /* 语义别名 */
  --bg-base: var(--deep-sea);
  --bg-raised: var(--night-blue);
  --bg-sunken: #081724;
  --ink: var(--sand-white);
  --ink-dim: #A9BCC9;
  --ink-mute: var(--mist-blue);
  --accent: var(--palm-green);
  --accent-soft: var(--palm-light);
  --alert: var(--felt-red);
  --gold: var(--coin-gold);

  /* 线条 */
  --line: rgba(124, 147, 163, 0.26);
  --line-soft: rgba(124, 147, 163, 0.14);
  --line-accent: rgba(111, 199, 154, 0.42);

  /* 排版 */
  --font-display: "华悦棱面黑", "思源黑体 Heavy", "HarmonyOS Sans SC Heavy", "PingFang SC", system-ui, sans-serif;
  --font-body: "Inter", "Noto Sans SC", "苹方", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "Roboto Mono", "等距更纱黑体", ui-monospace, Consolas, monospace;

  /* 尺寸与节奏 */
  --header-h: 78px;
  --shell-max: 1320px;
  --gutter: clamp(18px, 4vw, 44px);
  --gap: clamp(16px, 2.4vw, 28px);
  --radius: 2px;

  /* 动效 */
  --ease: cubic-bezier(0.22, 0.7, 0.28, 1);
  --dur: 0.24s;

  /* 阴影 */
  --shadow-card: 0 18px 40px -24px rgba(0, 0, 0, 0.85);
  --shadow-panel: -24px 0 60px -30px #000;
}

/* --------------------------------------------------------------------------
   1. Reset
   -------------------------------------------------------------------------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 18px);
}

body {
  margin: 0;
  min-height: 100%;
  background-color: var(--bg-base);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  font-weight: 400;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 棋盘格精密网格，铺满视口 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(28, 59, 74, 0.45) 1px, transparent 1px),
    linear-gradient(90deg, rgba(28, 59, 74, 0.45) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: 0.55;
}

main,
#main-content {
  position: relative;
  z-index: 1;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 0.6em;
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -0.02em;
  color: var(--ink);
}

h1 { font-size: clamp(2.4rem, 6vw, 5rem); }
h2 { font-size: clamp(1.5rem, 3.2vw, 2.4rem); }
h3 { font-size: clamp(1.15rem, 2vw, 1.5rem); }

p { margin: 0 0 1.2em; }
p:last-child { margin-bottom: 0; }

a { color: inherit; }

img, svg, video {
  display: block;
  max-width: 100%;
  height: auto;
}

ul, ol { margin: 0 0 1.2em; padding-left: 1.3em; }

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}

hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 0;
}

:focus-visible {
  outline: 2px solid var(--palm-light);
  outline-offset: 3px;
}

/* --------------------------------------------------------------------------
   2. 通用工具类
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.container--narrow { max-width: 900px; }
.container--wide { max-width: 1560px; }

.mono {
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
}

.text-accent { color: var(--accent-soft); }
.text-gold { color: var(--coin-gold); }
.text-dim { color: var(--ink-dim); }

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gap);
}

.span-3 { grid-column: span 3; }
.span-4 { grid-column: span 4; }
.span-6 { grid-column: span 6; }
.span-8 { grid-column: span 8; }
.span-12 { grid-column: span 12; }

/* 带刻度的分隔线 */
.ruler {
  height: 12px;
  border-top: 1px solid var(--line);
  background-image: repeating-linear-gradient(
    90deg,
    var(--line) 0 1px,
    transparent 1px 14px
  );
  background-size: 14px 12px;
  background-repeat: repeat-x;
}

/* 展区标签 */
.zone-label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 5px 13px;
  border: 1px solid var(--line);
  background: rgba(28, 59, 74, 0.5);
  color: var(--palm-light);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
  line-height: 1.6;
  text-transform: uppercase;
  transition: border-color 0.4s var(--ease), color 0.4s var(--ease);
}

.zone-label::before {
  content: "";
  width: 6px;
  height: 6px;
  flex: 0 0 auto;
  background: var(--coin-gold);
  transform: rotate(45deg);
}

/* 说明牌卡片 */
.card {
  position: relative;
  display: block;
  padding: clamp(18px, 2.4vw, 28px);
  background: linear-gradient(160deg, rgba(18, 46, 69, 0.94), rgba(11, 30, 45, 0.94));
  border: 1px solid var(--line);
  box-shadow: var(--shadow-card);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.card:hover { border-color: var(--line-accent); }

.card-title {
  margin: 0 0 5px;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 900;
  letter-spacing: 0.01em;
  color: var(--ink);
}

.card-meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--mist-blue);
}

/* --------------------------------------------------------------------------
   3. 按钮
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.06em;
  line-height: 1.4;
  text-decoration: none;
  cursor: pointer;
  transition: background-color var(--dur) var(--ease),
              color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease);
}

.btn--primary {
  background: var(--palm-green);
  border-color: var(--palm-green);
  color: #05170F;
}
.btn--primary:hover {
  background: var(--palm-light);
  border-color: var(--palm-light);
  box-shadow: 0 12px 26px -14px rgba(111, 199, 154, 0.85);
}

.btn--ghost {
  background: rgba(28, 59, 74, 0.4);
  border-color: var(--line);
  color: var(--ink);
}
.btn--ghost:hover {
  border-color: var(--line-accent);
  background: rgba(28, 59, 74, 0.8);
}

.btn--gold {
  background: transparent;
  border-color: rgba(201, 162, 39, 0.5);
  color: var(--coin-gold);
}
.btn--gold:hover {
  background: rgba(201, 162, 39, 0.12);
  border-color: var(--coin-gold);
}

/* --------------------------------------------------------------------------
   4. 面包屑
   -------------------------------------------------------------------------- */
.breadcrumb { padding: 16px 0; }

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--mist-blue);
}

.breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb li + li::before {
  content: "›";
  color: var(--mist-blue);
  opacity: 0.7;
}

.breadcrumb a {
  color: var(--ink-dim);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.breadcrumb a:hover {
  color: var(--palm-light);
  border-bottom-color: var(--line-accent);
}

.breadcrumb [aria-current="page"] {
  color: var(--sand-white);
}

/* --------------------------------------------------------------------------
   5. 图片容器（页面阶段放置图片占位）
   -------------------------------------------------------------------------- */
.img-frame {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  background: linear-gradient(135deg, var(--board-teal) 0%, var(--deep-sea) 100%);
  border: 1px solid var(--line);
}

.img-frame > img,
.img-frame > picture > img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.img-frame--16x9 { aspect-ratio: 16 / 9; }
.img-frame--4x3  { aspect-ratio: 4 / 3; }
.img-frame--1x1  { aspect-ratio: 1 / 1; }
.img-frame--3x4  { aspect-ratio: 3 / 4; }
.img-frame--21x9 { aspect-ratio: 21 / 9; }
.img-frame--auto { aspect-ratio: auto; }

.img-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  box-shadow:
    inset 0 0 0 1px rgba(11, 30, 45, 0.55),
    inset 0 -70px 90px -70px rgba(11, 30, 45, 0.95);
}

.img-frame__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  padding: 14px 16px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--sand-white);
  background: linear-gradient(180deg, rgba(11, 30, 45, 0), rgba(11, 30, 45, 0.9) 72%);
}

/* --------------------------------------------------------------------------
   6. 跳至主要内容
   -------------------------------------------------------------------------- */
.skip-link {
  position: absolute;
  left: 12px;
  top: -80px;
  z-index: 300;
  padding: 10px 18px;
  background: var(--palm-green);
  color: #05170F;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-decoration: none;
  transition: top var(--dur) var(--ease);
}

.skip-link:focus {
  top: 12px;
}

/* --------------------------------------------------------------------------
   7. 站点头部（框架式导航：导航即边框上沿）
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 120;
  background: linear-gradient(180deg, rgba(11, 30, 45, 0.98) 0%, rgba(18, 46, 69, 0.95) 100%);
  border-bottom: 1px solid var(--line);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

/* 底部刻度带：边框向下延伸的细线网格 */
.header-frame {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 6px;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    90deg,
    rgba(124, 147, 163, 0.45) 0 1px,
    transparent 1px 18px
  );
  opacity: 0.75;
}

.header-inner {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  min-height: var(--header-h);
  padding: 0 var(--gutter);
  display: flex;
  align-items: center;
  gap: clamp(12px, 1.8vw, 28px);
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
  padding: 6px 12px 6px 6px;
  border: 1px solid transparent;
  text-decoration: none;
  color: var(--sand-white);
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.brand:hover {
  border-color: var(--line);
  background: rgba(28, 59, 74, 0.5);
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  flex: 0 0 auto;
  background: linear-gradient(150deg, var(--palm-green), #1D5B42);
  color: #04150E;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 900;
  line-height: 1;
  clip-path: polygon(0 0, 100% 0, 100% 72%, 72% 100%, 0 100%);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 900;
  letter-spacing: 0.02em;
  color: var(--sand-white);
}

.brand-tagline {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--mist-blue);
  white-space: nowrap;
}

/* 导航主体 */
.site-nav {
  flex: 1 1 auto;
  min-width: 0;
  display: flex;
  justify-content: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(2px, 0.8vw, 12px);
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-item { list-style: none; }

.nav-link {
  position: relative;
  display: inline-block;
  padding: 10px clamp(8px, 0.9vw, 14px);
  font-size: 14.5px;
  letter-spacing: 0.06em;
  color: var(--ink-dim);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur) var(--ease);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: clamp(8px, 0.9vw, 14px);
  right: clamp(8px, 0.9vw, 14px);
  bottom: 4px;
  height: 1px;
  background: var(--palm-light);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.nav-link:hover { color: var(--sand-white); }
.nav-link:hover::after { transform: scaleX(1); }

.nav-link[aria-current="page"] { color: var(--palm-light); }
.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
  background: var(--coin-gold);
}

/* 移动抽屉内的补充链接（桌面端隐藏） */
.nav-foot { display: none; }

.nav-foot-link {
  display: inline-flex;
  align-items: center;
  padding: 12px 16px;
  border: 1px solid var(--line);
  background: rgba(28, 59, 74, 0.45);
  color: var(--ink-dim);
  font-size: 14px;
  letter-spacing: 0.06em;
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.nav-foot-link:hover {
  color: var(--sand-white);
  border-color: var(--line-accent);
}

/* 右侧操作区 */
.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  margin-left: auto;
}

.room-entry {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 9px 16px;
  background: var(--palm-green);
  border: 1px solid rgba(111, 199, 154, 0.6);
  border-radius: var(--radius);
  color: #05170F;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.05em;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  transition: background-color var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}

.room-entry:hover {
  background: var(--palm-light);
  border-color: var(--palm-light);
  box-shadow: 0 12px 26px -16px rgba(111, 199, 154, 0.9);
}

.room-entry-dot {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  background: #05170F;
  transform: rotate(45deg);
}

.room-entry-label { line-height: 1.4; }

.version-switch {
  display: inline-flex;
  align-items: center;
  padding: 9px 14px;
  border: 1px solid var(--line);
  background: rgba(28, 59, 74, 0.38);
  color: var(--ink-dim);
  font-size: 13.5px;
  letter-spacing: 0.06em;
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              background-color var(--dur) var(--ease);
}

.version-switch:hover {
  color: var(--sand-white);
  border-color: var(--line-accent);
  background: rgba(28, 59, 74, 0.8);
}

/* 移动端菜单按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 14px;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--sand-white);
  font-size: 13.5px;
  letter-spacing: 0.08em;
  line-height: 1.4;
  cursor: pointer;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.nav-toggle:hover {
  border-color: var(--line-accent);
  background: rgba(28, 59, 74, 0.6);
}

.nav-toggle-bars {
  display: grid;
  gap: 4px;
  width: 16px;
  flex: 0 0 auto;
}

.nav-toggle-bars i {
  display: block;
  height: 1px;
  background: currentColor;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(1) {
  transform: translateY(5px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(3) {
  transform: translateY(-5px) rotate(-45deg);
}

/* 顶部阅读进度 */
.progress-track {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 3;
  display: block;
  height: 2px;
  background: rgba(124, 147, 163, 0.16);
  overflow: hidden;
}

.progress-bar {
  display: block;
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, var(--palm-green), var(--coin-gold));
}

/* --------------------------------------------------------------------------
   8. 站点页脚
   -------------------------------------------------------------------------- */
.site-footer {
  position: relative;
  z-index: 1;
  margin-top: clamp(60px, 10vw, 120px);
  background: linear-gradient(180deg, #0B1E2D 0%, #081724 100%);
  border-top: 1px solid var(--line);
}

.footer-rail {
  display: block;
  height: 12px;
  border-bottom: 1px solid var(--line-soft);
  background-image: repeating-linear-gradient(
    90deg,
    var(--line) 0 1px,
    transparent 1px 14px
  );
  background-size: 14px 12px;
  background-repeat: repeat-x;
}

.footer-inner {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: clamp(40px, 6vw, 72px) var(--gutter) clamp(28px, 4vw, 40px);
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) repeat(3, minmax(0, 1fr));
  gap: clamp(24px, 4vw, 56px);
}

.footer-brand-name {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 900;
  letter-spacing: 0.02em;
  line-height: 1.2;
  color: var(--sand-white);
}

.footer-brand-copy {
  margin: 0 0 16px;
  max-width: 34ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-dim);
}

.footer-transparency {
  margin: 0;
  padding: 12px 14px;
  border-left: 2px solid var(--coin-gold);
  background: rgba(201, 162, 39, 0.07);
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--ink-dim);
}

.footer-heading {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.2em;
  line-height: 1.5;
  color: var(--mist-blue);
  text-transform: uppercase;
}

.footer-links {
  display: grid;
  gap: 9px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-links a {
  display: inline-block;
  padding-bottom: 2px;
  font-size: 15px;
  color: var(--ink-dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.footer-links a:hover {
  color: var(--palm-light);
  border-bottom-color: var(--line-accent);
}

.footer-contact {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-contact li {
  display: grid;
  gap: 3px;
}

.footer-contact-label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--mist-blue);
}

.footer-contact-value {
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--sand-white);
  word-break: break-word;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 28px;
  margin-top: clamp(32px, 5vw, 56px);
  padding-top: 22px;
  border-top: 1px solid var(--line-soft);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--mist-blue);
}

.footer-bottom p { margin: 0; }

.footer-icp { font-family: var(--font-mono); }

/* --------------------------------------------------------------------------
   9. 滚动状态（由 site.js 写入）
   -------------------------------------------------------------------------- */
.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.55s var(--ease), transform 0.55s var(--ease);
}

.has-js [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

.has-js [data-section] {
  transition: border-color 0.4s var(--ease);
}

[data-section].is-active .zone-label,
[data-section].is-active > .zone-label {
  border-color: var(--line-accent);
  color: var(--sand-white);
  background: rgba(47, 125, 91, 0.18);
}

body[data-nav-locked] { overflow: hidden; }

/* --------------------------------------------------------------------------
   10. 响应式
   -------------------------------------------------------------------------- */
@media (max-width: 1240px) {
  .brand-tagline { display: none; }
}

@media (max-width: 1079px) {
  :root { --header-h: 66px; }

  .brand-mark { width: 34px; height: 34px; font-size: 17px; }
  .brand-name { font-size: 17px; }

  .version-switch { display: none; }
  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: fixed;
    top: var(--header-h);
    right: 0;
    bottom: 0;
    left: auto;
    width: min(360px, 88vw);
    display: block;
    padding: 26px var(--gutter) 40px;
    background: linear-gradient(180deg, #0E2434 0%, #0B1E2D 100%);
    border-left: 1px solid var(--line);
    box-shadow: var(--shadow-panel);
    overflow-y: auto;
    overscroll-behavior: contain;
    transform: translateX(102%);
    visibility: hidden;
    transition: transform 0.3s var(--ease), visibility 0.3s var(--ease);
  }

  .site-nav[data-open] {
    transform: translateX(0);
    visibility: visible;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .nav-item { border-bottom: 1px solid var(--line-soft); }

  .nav-link {
    display: block;
    padding: 16px 2px;
    font-size: 16px;
    letter-spacing: 0.09em;
    white-space: normal;
  }

  .nav-link::after {
    left: 2px;
    right: auto;
    width: 22px;
    bottom: 11px;
  }

  .nav-foot {
    display: block;
    margin-top: 28px;
  }

  .nav-foot-link { width: 100%; justify-content: center; }

  .footer-top { grid-template-columns: 1fr 1fr; gap: 34px; }
  .footer-brand { grid-column: 1 / -1; }

  .grid-12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .span-3,
  .span-4 { grid-column: span 3; }
  .span-6,
  .span-8 { grid-column: span 6; }
}

@media (max-width: 640px) {
  body { font-size: 16px; }

  .header-inner { gap: 10px; }

  .room-entry { padding: 8px 12px; font-size: 13px; }
  .nav-toggle { padding: 8px 11px; }
  .nav-toggle-label { display: none; }

  .footer-top { grid-template-columns: 1fr; gap: 28px; }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }

  .grid-12 { grid-template-columns: minmax(0, 1fr); }
  .span-3,
  .span-4,
  .span-6,
  .span-8,
  .span-12 { grid-column: span 1; }
}

@media print {
  body::before,
  .progress-track,
  .nav-toggle { display: none !important; }
  body { background: #fff; color: #000; }
}

/* --------------------------------------------------------------------------
   11. 动效偏好
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  .has-js [data-reveal] {
    opacity: 1;
    transform: none;
  }
}