/* ==========================================================================
   63棋牌中国站 · 共享基础样式 /assets/site.css
   ========================================================================== */

:root {
  /* 色板：老牌棋牌室桌面、筹码与说明书纸面 */
  --ink-deep: #0D2A22;
  --ink-mid: #1B4A3A;
  --gold: #C9A24A;
  --gold-soft: #E8D8A8;
  --cinnabar: #B83A2E;
  --slate: #6E7F8D;
  --paper: #F7F1E3;
  --paper-bright: #FFFDF6;
  --ink: #15130F;
  --bronze: #8A6A3B;

  --line: rgba(27, 74, 58, 0.16);
  --line-gold: rgba(201, 162, 74, 0.42);
  --on-deep: rgba(255, 253, 246, 0.82);
  --on-deep-soft: rgba(232, 216, 168, 0.62);

  /* 字体：导航牌（黑体）+ 说明书（宋体）+ 版本号（等宽） */
  --font-display: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Noto Serif SC", "Songti SC", "SimSun", "FangSong", serif;
  --font-mono: "IBM Plex Mono", "Roboto Mono", ui-monospace, SFMono-Regular, Consolas, monospace;

  --h1: clamp(2.35rem, 6.6vw, 5.2rem);
  --h2: clamp(1.7rem, 3.4vw, 3rem);
  --h3: clamp(1.15rem, 1.5vw, 1.55rem);

  --shell: min(1240px, 92vw);
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 10px;
  --ease: cubic-bezier(0.22, 0.7, 0.28, 1);
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: clamp(84px, 12vh, 112px);
}

body {
  margin: 0;
  background-color: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: clamp(1rem, 0.94rem + 0.3vw, 1.125rem);
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.01em;
  margin: 0;
  color: var(--ink-deep);
}

h1 { font-size: var(--h1); font-weight: 900; line-height: 1.06; }
h2 { font-size: var(--h2); }
h3 { font-size: var(--h3); }

p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }
ul, ol { margin: 0; padding: 0; }
img, svg, video { display: block; max-width: 100%; }
figure { margin: 0; }
button { font: inherit; color: inherit; background: none; border: 0; }
a { color: var(--ink-mid); text-underline-offset: 0.22em; }

::selection { background: var(--gold); color: var(--ink-deep); }

:focus-visible {
  outline: 3px solid var(--gold);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 0.5rem;
  left: 0.5rem;
  z-index: 300;
  padding: 0.7rem 1.15rem;
  border-radius: 999px;
  background: var(--gold);
  color: var(--ink-deep);
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
  transform: translateY(-180%);
  transition: transform 0.2s var(--ease);
}
.skip-link:focus { transform: translateY(0); }

/* ---------- 布局工具 ---------- */
.shell {
  width: var(--shell);
  margin-inline: auto;
}
.shell--narrow {
  width: min(760px, 92vw);
  margin-inline: auto;
}
.section {
  padding-block: clamp(2.5rem, 6vw, 5rem);
}
.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 1.4rem;
  margin-bottom: clamp(1.2rem, 2.6vw, 2rem);
}
.rule {
  height: 1px;
  border: 0;
  margin: clamp(1.6rem, 3vw, 2.6rem) 0;
  background: linear-gradient(90deg, var(--line-gold), rgba(201, 162, 74, 0));
}

/* ---------- 文本层级 ---------- */
.eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--bronze);
}
.eyebrow--gold { color: var(--gold); }
.eyebrow--cinnabar { color: var(--cinnabar); }

.lede {
  max-width: 34em;
  font-size: clamp(1.02rem, 0.86rem + 0.6vw, 1.2rem);
  line-height: 1.9;
  color: rgba(21, 19, 15, 0.82);
}

.note-mark {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 0.76rem;
  line-height: 1.7;
  letter-spacing: 0.05em;
  color: var(--bronze);
}
.note-mark--vertical {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  letter-spacing: 0.34em;
}

/* ---------- 棋盘底纹 ---------- */
.board-grid {
  background-color: var(--paper);
  background-image:
    linear-gradient(to right, rgba(27, 74, 58, 0.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(27, 74, 58, 0.07) 1px, transparent 1px);
  background-size: 68px 68px;
}
.board-grid--deep {
  background-color: var(--ink-deep);
  background-image:
    linear-gradient(to right, rgba(232, 216, 168, 0.09) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(232, 216, 168, 0.09) 1px, transparent 1px);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.7rem 1.25rem;
  border: 1px solid transparent;
  border-radius: 999px;
  font-family: var(--font-display);
  font-size: 0.92rem;
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition:
    background-color 0.2s var(--ease),
    color 0.2s var(--ease),
    border-color 0.2s var(--ease),
    transform 0.2s var(--ease);
}
.btn:active { transform: translateY(1px); }

.btn--gold {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--ink-deep);
}
.btn--gold:hover { background: var(--gold-soft); border-color: var(--gold-soft); }

.btn--ink {
  background: var(--ink-deep);
  border-color: var(--ink-deep);
  color: var(--paper-bright);
}
.btn--ink:hover { background: var(--ink-mid); border-color: var(--ink-mid); }

.btn--outline {
  background: transparent;
  border-color: rgba(27, 74, 58, 0.35);
  color: var(--ink-deep);
}
.btn--outline:hover {
  background: rgba(201, 162, 74, 0.12);
  border-color: var(--gold);
  color: var(--ink-mid);
}

.btn--ghost {
  background: transparent;
  border-color: rgba(201, 162, 74, 0.55);
  color: var(--gold-soft);
}
.btn--ghost:hover {
  background: rgba(201, 162, 74, 0.16);
  border-color: var(--gold);
  color: var(--paper-bright);
}

.btn--cinnabar {
  background: var(--cinnabar);
  border-color: var(--cinnabar);
  color: var(--paper-bright);
}
.btn--cinnabar:hover { background: #A02F24; border-color: #A02F24; }

/* ---------- 筹码标签 ---------- */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.3rem 0.8rem 0.3rem 0.5rem;
  border: 1px solid rgba(201, 162, 74, 0.4);
  border-radius: 999px;
  background: rgba(255, 253, 246, 0.72);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--bronze);
  white-space: nowrap;
}
.chip::before {
  content: "";
  flex: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: radial-gradient(circle at 34% 30%, var(--gold-soft), var(--gold) 60%, var(--bronze));
  box-shadow: inset 0 0 0 2px rgba(13, 42, 34, 0.35);
}
.chip--cinnabar {
  border-color: rgba(184, 58, 46, 0.42);
  color: var(--cinnabar);
}
.chip--cinnabar::before {
  background: radial-gradient(circle at 34% 30%, #E5A79E, var(--cinnabar) 62%, #7B2119);
}
.chip--slate {
  border-color: rgba(110, 127, 141, 0.42);
  color: #4A5A67;
}
.chip--slate::before {
  background: radial-gradient(circle at 34% 30%, #C2CDD6, var(--slate) 62%, #3E4C56);
}

/* ---------- 入口卡片 ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(215px, 1fr));
  gap: clamp(0.7rem, 1.5vw, 1.1rem);
}
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: clamp(1rem, 2vw, 1.4rem);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--paper-bright);
  color: inherit;
  text-decoration: none;
  transition:
    transform 0.22s var(--ease),
    border-color 0.22s var(--ease),
    box-shadow 0.22s var(--ease);
}
a.card:hover {
  transform: translateY(-3px);
  border-color: var(--line-gold);
  box-shadow: 0 14px 30px rgba(13, 42, 34, 0.12);
}
.card__index {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  color: var(--gold);
}
.card__title {
  font-family: var(--font-display);
  font-size: 1.06rem;
  font-weight: 800;
  color: var(--ink-deep);
}
.card__text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: rgba(21, 19, 15, 0.72);
}

/* ---------- 说明面板 ---------- */
.panel {
  padding: clamp(1.15rem, 2.4vw, 1.8rem);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--paper-bright);
}
.panel--deep {
  border-color: rgba(201, 162, 74, 0.28);
  background: var(--ink-deep);
  color: var(--on-deep);
}
.panel--deep h2,
.panel--deep h3 { color: var(--paper-bright); }
.panel--slate {
  border-color: rgba(110, 127, 141, 0.28);
  background: rgba(110, 127, 141, 0.1);
}

/* ---------- 图片容器（页面阶段放入 <img>） ---------- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 4 / 3;
  border-radius: var(--radius-md);
  background: linear-gradient(140deg, var(--ink-mid), var(--ink-deep));
  box-shadow: inset 0 0 0 1px rgba(201, 162, 74, 0.24);
}
.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(232, 216, 168, 0.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(232, 216, 168, 0.07) 1px, transparent 1px);
  background-size: 48px 48px;
}
.media-frame--wide { aspect-ratio: 16 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-caption {
  margin: 0.6rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--bronze);
}

/* ---------- 面包屑 ---------- */
.breadcrumbs { padding-block: 0.9rem 0; }
.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  list-style: none;
}
.breadcrumbs li {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--bronze);
}
.breadcrumbs li + li::before {
  content: "/";
  color: rgba(138, 106, 59, 0.5);
}
.breadcrumbs a {
  color: var(--ink-mid);
  text-decoration: none;
}
.breadcrumbs a:hover { color: var(--gold); }
.breadcrumbs [aria-current="page"] { color: rgba(21, 19, 15, 0.6); }

/* ==========================================================================
   头部：透明叠加 → 首屏后转深墨绿实色
   ========================================================================== */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 120;
  isolation: isolate;
}
.site-header::before,
.site-header::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  transition: opacity 0.24s linear;
}
.site-header::before {
  opacity: 1;
  background: linear-gradient(
    180deg,
    rgba(13, 42, 34, 0.9) 0%,
    rgba(13, 42, 34, 0.56) 58%,
    rgba(13, 42, 34, 0) 100%
  );
}
.site-header::after {
  opacity: 0;
  background: rgba(13, 42, 34, 0.97);
  box-shadow:
    0 1px 0 rgba(201, 162, 74, 0.34),
    0 16px 34px rgba(13, 42, 34, 0.22);
}
.site-header.is-solid::before { opacity: 0; }
.site-header.is-solid::after { opacity: 1; }

.header-shell {
  position: relative;
  display: flex;
  align-items: center;
  gap: clamp(0.8rem, 2.4vw, 2rem);
  width: var(--shell);
  margin-inline: auto;
  padding-block: clamp(0.7rem, 1.4vw, 1.05rem);
}

/* 品牌：筹码 + 大字 + 等宽小注 */
.brand {
  position: relative;
  z-index: 140;
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--paper-bright);
  text-decoration: none;
  flex: none;
}
.brand-chip {
  position: relative;
  flex: none;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: radial-gradient(circle at 33% 30%, var(--gold-soft), var(--gold) 58%, var(--bronze));
  box-shadow:
    inset 0 0 0 3px rgba(13, 42, 34, 0.5),
    0 3px 8px rgba(0, 0, 0, 0.35);
}
.brand-chip::after {
  content: "";
  position: absolute;
  inset: 9px;
  border-radius: 50%;
  border: 1px dashed rgba(13, 42, 34, 0.55);
}
.brand-text {
  display: flex;
  flex-direction: column;
  gap: 0.05rem;
  line-height: 1.15;
}
.brand-name {
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 1.4vw, 1.32rem);
  font-weight: 900;
  letter-spacing: 0.04em;
}
.brand-tag {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.16em;
  color: rgba(232, 216, 168, 0.78);
}

/* 移动菜单按钮 */
.nav-toggle {
  position: relative;
  z-index: 140;
  display: none;
  align-items: center;
  gap: 0.55rem;
  margin-left: auto;
  padding: 0.5rem 0.9rem;
  border: 1px solid rgba(201, 162, 74, 0.5);
  border-radius: 999px;
  background: rgba(232, 216, 168, 0.08);
  color: var(--gold-soft);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  cursor: pointer;
  transition:
    background-color 0.2s var(--ease),
    border-color 0.2s var(--ease),
    color 0.2s var(--ease);
}
.nav-toggle-bar {
  position: relative;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
}
.nav-toggle-bar::before,
.nav-toggle-bar::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform 0.24s var(--ease);
}
.nav-toggle-bar::before { top: -6px; }
.nav-toggle-bar::after { top: 6px; }
.nav-toggle[aria-expanded="true"] {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--ink-deep);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar::before {
  transform: translateY(6px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar::after {
  transform: translateY(-6px) rotate(-45deg);
}

/* 主导航 */
.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(0.9rem, 2.4vw, 2.2rem);
  margin-left: auto;
  min-width: 0;
}
.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(0.4rem, 1.4vw, 1.35rem);
  list-style: none;
  counter-reset: nav;
}
.nav-list li { counter-increment: nav; }
.nav-list a {
  position: relative;
  display: block;
  padding: 0.95rem 0.2rem 0.5rem;
  color: rgba(255, 253, 246, 0.8);
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  text-decoration: none;
  transition: color 0.2s var(--ease);
}
.nav-list a::before {
  content: "0" counter(nav);
  position: absolute;
  top: 0.22rem;
  left: 0.2rem;
  font-family: var(--font-mono);
  font-size: 0.56rem;
  letter-spacing: 0.12em;
  color: var(--gold);
  opacity: 0.45;
  transition: opacity 0.2s var(--ease);
}
.nav-list a::after {
  content: "";
  position: absolute;
  left: 0.2rem;
  right: 0.2rem;
  bottom: 0.26rem;
  height: 2px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.22s var(--ease);
}
.nav-list a:hover,
.nav-list a:focus-visible { color: var(--paper-bright); }
.nav-list a:hover::before,
.nav-list a:focus-visible::before,
.nav-list a[aria-current="page"]::before { opacity: 1; }
.nav-list a:hover::after,
.nav-list a:focus-visible::after { transform: scaleX(1); }
.nav-list a[aria-current="page"] { color: var(--gold-soft); }
.nav-list a[aria-current="page"]::after {
  transform: scaleX(1);
  background: var(--cinnabar);
}

.nav-status {
  display: none;
  max-width: 13.5rem;
  margin: 0;
  padding-left: 0.9rem;
  border-left: 1px solid rgba(201, 162, 74, 0.4);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  line-height: 1.65;
  letter-spacing: 0.04em;
  color: rgba(232, 216, 168, 0.72);
}

/* ==========================================================================
   页脚：深墨绿桌面 + 棋盘纹理
   ========================================================================== */
.site-footer {
  position: relative;
  margin-top: clamp(4rem, 10vw, 9rem);
  overflow: hidden;
  background: linear-gradient(180deg, var(--ink-deep) 0%, #0A211A 100%);
  color: var(--on-deep);
}
.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(201, 162, 74, 0.1) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(201, 162, 74, 0.1) 1px, transparent 1px);
  background-size: 78px 78px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), rgba(0, 0, 0, 0.22));
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), rgba(0, 0, 0, 0.22));
}
.site-footer::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, rgba(201, 162, 74, 0), rgba(201, 162, 74, 0.7), rgba(201, 162, 74, 0));
}
.footer-shell {
  position: relative;
  z-index: 1;
  width: var(--shell);
  margin-inline: auto;
  padding-block: clamp(2.6rem, 6vw, 4.4rem) clamp(1.4rem, 3vw, 2.2rem);
}
.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.9fr) minmax(0, 1.15fr);
  gap: clamp(1.8rem, 4vw, 3.6rem);
  padding-bottom: clamp(2rem, 4vw, 3rem);
  border-bottom: 1px solid rgba(201, 162, 74, 0.22);
}

.footer-brandline {
  margin: 0 0 0.9rem;
  font-family: var(--font-display);
  font-size: clamp(1.08rem, 1.5vw, 1.32rem);
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--paper-bright);
}
.footer-brandline::before {
  content: "";
  display: block;
  width: 46px;
  height: 3px;
  margin-bottom: 0.9rem;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--gold), var(--cinnabar));
}
.footer-note {
  max-width: 30rem;
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.9;
  color: var(--on-deep-soft);
}

.footer-heading {
  margin: 0 0 1rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--gold);
}
.footer-nav ul {
  display: grid;
  gap: 0.6rem;
  list-style: none;
}
.footer-nav a {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--on-deep);
  font-family: var(--font-display);
  font-size: 0.94rem;
  text-decoration: none;
  transition: color 0.2s var(--ease), transform 0.2s var(--ease);
}
.footer-nav a::before {
  content: "";
  flex: none;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--bronze);
  transition: background-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}
.footer-nav a:hover {
  color: var(--paper-bright);
  transform: translateX(3px);
}
.footer-nav a:hover::before {
  background: var(--gold);
  box-shadow: 0 0 0 3px rgba(201, 162, 74, 0.22);
}

.contact-list {
  display: grid;
  gap: 1.05rem;
  list-style: none;
}
.contact-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 0.2rem 0.75rem;
}
.contact-label {
  grid-column: 1 / -1;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  color: rgba(174, 190, 202, 0.9);
}
.contact-value {
  font-family: var(--font-mono);
  font-size: 0.86rem;
  letter-spacing: 0.02em;
  color: var(--paper-bright);
}
.contact-value--wrap { word-break: break-all; }
.copy-btn {
  padding: 0.2rem 0.65rem;
  border: 1px solid rgba(201, 162, 74, 0.4);
  border-radius: 999px;
  background: transparent;
  color: var(--gold-soft);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  cursor: pointer;
  white-space: nowrap;
  transition:
    background-color 0.2s var(--ease),
    color 0.2s var(--ease),
    border-color 0.2s var(--ease);
}
.copy-btn:hover {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--ink-deep);
}
.copy-btn.is-done {
  background: rgba(201, 162, 74, 0.2);
  border-color: var(--gold-soft);
  color: var(--gold-soft);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
  padding-top: clamp(1.1rem, 2.4vw, 1.6rem);
}
.footer-icp,
.footer-copy {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: rgba(232, 216, 168, 0.55);
}

/* ---------- 返回顶部（由共享 JS 注入） ---------- */
.to-top {
  position: fixed;
  right: clamp(0.9rem, 3vw, 2rem);
  bottom: clamp(0.9rem, 3vw, 2rem);
  z-index: 150;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1.05rem;
  border: 1px solid rgba(201, 162, 74, 0.55);
  border-radius: 999px;
  background: rgba(13, 42, 34, 0.94);
  color: var(--gold-soft);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  cursor: pointer;
  box-shadow: 0 12px 26px rgba(13, 42, 34, 0.28);
  transition:
    background-color 0.2s var(--ease),
    color 0.2s var(--ease),
    border-color 0.2s var(--ease);
}
.to-top[hidden] { display: none; }
.to-top::before {
  content: "";
  width: 8px;
  height: 8px;
  border-left: 1.5px solid currentColor;
  border-top: 1.5px solid currentColor;
  transform: rotate(45deg) translate(1px, 1px);
}
.to-top:hover {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--ink-deep);
}

/* ---------- 滚动显现 ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(12px) scale(0.96);
  transition:
    opacity 0.62s var(--ease),
    transform 0.62s var(--ease);
}
.js [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

html.nav-open,
html.nav-open body { overflow: hidden; }

/* ==========================================================================
   响应式
   ========================================================================== */
@media (min-width: 1200px) {
  .nav-status { display: block; }
}

@media (max-width: 1024px) {
  .footer-top { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 1000px) {
  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    z-index: 130;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    width: min(340px, 86vw);
    margin: 0;
    padding: 5.5rem 1.6rem 2.5rem;
    overflow-y: auto;
    overscroll-behavior: contain;
    background: linear-gradient(165deg, #163A2D 0%, #0D2A22 56%, #0A211A 100%);
    box-shadow: -20px 0 48px rgba(6, 20, 16, 0.5);
    transform: translateX(102%);
    transition: transform 0.34s var(--ease);
  }
  .site-nav[data-open="true"] { transform: translateX(0); }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: 100%;
  }
  .nav-list a {
    padding: 0.9rem 0.5rem 0.9rem 2.4rem;
    font-size: 1.12rem;
    font-weight: 700;
    border-bottom: 1px solid rgba(201, 162, 74, 0.16);
  }
  .nav-list a::before {
    top: 50%;
    left: 0.35rem;
    transform: translateY(-50%);
    font-size: 0.68rem;
    opacity: 0.8;
  }
  .nav-list a::after { display: none; }
  .nav-list a[aria-current="page"] {
    background: rgba(201, 162, 74, 0.09);
    color: var(--gold-soft);
  }

  .nav-status {
    display: block;
    max-width: none;
    margin-top: 1.3rem;
    padding: 1.1rem 0 0;
    border-left: 0;
    border-top: 1px solid rgba(201, 162, 74, 0.2);
  }
  .site-nav > .btn {
    width: 100%;
    margin-top: 1.4rem;
  }
}

@media (max-width: 720px) {
  .footer-top { grid-template-columns: minmax(0, 1fr); }
  .footer-brand { grid-column: auto; }
  .contact-item { grid-template-columns: minmax(0, 1fr) auto; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .brand-chip { width: 28px; height: 28px; }
  .brand-chip::after { inset: 8px; }
}

@media (max-width: 420px) {
  .nav-toggle-label { display: none; }
  .nav-toggle { padding: 0.55rem 0.7rem; }
}

/* ---------- 动效降级 ---------- */
@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;
  }
  .js [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }
  .site-nav { transition: none; }
}