/* =========================================================
   排列3登录 · 共享样式表  /assets/site.css
   蓝图网格 · 版本档案馆
   ========================================================= */

/* ---------- 01. reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 100px;
}

body, h1, h2, h3, h4, h5, p, figure, blockquote, dl, dd, ul, ol, hr { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
table { width: 100%; border-collapse: collapse; }
[hidden] { display: none !important; }

/* ---------- 02. tokens ---------- */
:root {
  --ink: #0A1A28;
  --ink-2: #10293D;
  --ink-3: #14344C;
  --rule: #1C4A66;
  --cyan: #21E6C1;
  --cyan-2: #3BF0D0;
  --cyan-3: #0FA8C9;
  --amber: #FF8A3D;
  --cinnabar: #C8402F;
  --cream: #F2ECE1;
  --slate: #8FA8BC;
  --slate-2: #6E8CA5;
  --deepest: #05101A;

  --bg: var(--ink);
  --bg-deep: var(--deepest);
  --bg-panel: var(--ink-2);
  --text: var(--cream);
  --text-dim: var(--slate);
  --text-strong: #FFFFFF;
  --line: rgba(28, 74, 102, 0.9);
  --line-soft: rgba(28, 74, 102, 0.52);

  --font-display: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-serif: "Noto Serif SC", "Songti SC", "Source Han Serif SC", Georgia, "Times New Roman", serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --maxw: 1280px;
  --gutter: clamp(18px, 4vw, 40px);
  --r-lg: 26px;
  --r-md: 18px;
  --r-sm: 12px;
  --r-pill: 999px;

  --shadow-panel: 0 18px 44px rgba(2, 10, 16, 0.5);
  --ease-out: cubic-bezier(0.22, 0.8, 0.28, 1);
}

/* ---------- 03. 基础排版 ---------- */
body {
  min-height: 100%;
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.8;
  color: var(--text);
  background-color: var(--ink);
  background-image:
    linear-gradient(to right, rgba(28, 74, 102, 0.22) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(28, 74, 102, 0.14) 1px, transparent 1px);
  background-size: 96px 96px, 96px 96px;
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--text-strong);
  line-height: 1.22;
}

h1 {
  font-size: clamp(2rem, 4vw, 3.4rem);
  letter-spacing: 0.12em;
  line-height: 1.1;
}
h2 { font-size: clamp(1.45rem, 2.4vw, 2rem); letter-spacing: 0.06em; }
h3 { font-size: 1.15rem; letter-spacing: 0.04em; }
h4 { font-size: 1rem; letter-spacing: 0.04em; }

p { color: rgba(242, 236, 225, 0.88); }

a { transition: color 0.2s ease; }

::selection { background: rgba(33, 230, 193, 0.28); color: var(--cream); }

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

html.nav-open { overflow: hidden; }

/* ---------- 04. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 999;
  padding: 10px 20px;
  border-radius: var(--r-pill);
  background: var(--cyan);
  color: var(--deepest);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
  transform: translateY(-200%);
  transition: transform 0.22s var(--ease-out);
}
.skip-link:focus,
.skip-link:focus-visible {
  transform: translateY(0);
  outline: 2px solid var(--cream);
  outline-offset: 3px;
}

/* ---------- 05. 容器与网格 ---------- */
.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.wrap--narrow { max-width: 860px; }

.page-top { padding-top: 140px; }

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(16px, 2vw, 28px);
}
.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-6 { grid-column: span 6; }
.col-8 { grid-column: span 8; }
.col-12 { grid-column: span 12; }

.stack { display: grid; gap: 16px; }
.stack-lg { display: grid; gap: 32px; }
.row { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; }

.hr { height: 1px; border: 0; background: var(--line-soft); }

/* ---------- 06. 工具类 ---------- */
.mono {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  font-variant-numeric: tabular-nums;
}
.mono-sm {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
}
.editorial,
.serif {
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.35;
  letter-spacing: 0.01em;
}
.text-dim { color: var(--slate); }
.text-cyan { color: var(--cyan); }
.text-amber { color: var(--amber); }

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

/* ---------- 07. 按钮 / 胶囊 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border: 1px solid transparent;
  border-radius: var(--r-pill);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.08em;
  line-height: 1.4;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color 0.22s ease, border-color 0.22s ease, color 0.22s ease, transform 0.22s ease;
}
.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--deepest);
}
.btn-primary:hover { background: var(--cyan-2); border-color: var(--cyan-2); }

.btn-ghost {
  background: rgba(5, 16, 26, 0.35);
  border-color: var(--line);
  color: var(--cream);
}
.btn-ghost:hover { border-color: var(--cyan); color: var(--cyan); }

.btn-amber {
  background: transparent;
  border-color: rgba(255, 138, 61, 0.55);
  color: var(--amber);
}
.btn-amber:hover { background: rgba(255, 138, 61, 0.12); border-color: var(--amber); }

/* ---------- 08. 徽标 / 标签 / 状态点 ---------- */
.brand-mark {
  display: grid;
  place-items: center;
  flex: none;
  width: 42px;
  height: 42px;
  border-radius: 13px;
  border: 1px solid rgba(33, 230, 193, 0.45);
  background:
    radial-gradient(120% 120% at 20% 0%, rgba(59, 240, 208, 0.28), transparent 62%),
    linear-gradient(160deg, rgba(16, 41, 61, 0.95), rgba(5, 16, 26, 0.95));
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  line-height: 1;
}
.brand-mark--lg {
  width: 54px;
  height: 54px;
  border-radius: 16px;
  font-size: 17px;
}

.tagbar {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--slate);
}

.dot {
  flex: none;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(33, 230, 193, 0.12);
}
.dot--amber { background: var(--amber); box-shadow: 0 0 0 4px rgba(255, 138, 61, 0.12); }
.dot--red { background: var(--cinnabar); box-shadow: 0 0 0 4px rgba(200, 64, 47, 0.16); }

.chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 16px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  background: rgba(16, 41, 61, 0.5);
  color: var(--slate);
  font-size: 13px;
  letter-spacing: 0.05em;
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}
.chip:hover { color: var(--cream); border-color: rgba(33, 230, 193, 0.5); }
.chip[aria-pressed="true"],
.chip.is-active {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--deepest);
  font-weight: 600;
}
.chip--amber[aria-pressed="true"],
.chip--amber.is-active {
  background: var(--amber);
  border-color: var(--amber);
  color: var(--deepest);
}

.batch {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 13px;
  border: 1px dashed rgba(33, 230, 193, 0.45);
  border-radius: var(--r-sm);
  background: rgba(33, 230, 193, 0.07);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
}
.batch--amber {
  border-color: rgba(255, 138, 61, 0.45);
  background: rgba(255, 138, 61, 0.08);
  color: var(--amber);
}

/* ---------- 09. 面板 / 说明牌 / 章节头 ---------- */
.panel {
  padding: clamp(20px, 3vw, 32px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: linear-gradient(180deg, rgba(16, 41, 61, 0.92), rgba(10, 26, 40, 0.86));
  box-shadow: var(--shadow-panel);
}

.plate {
  position: relative;
  padding: 18px 20px 18px 24px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(16, 41, 61, 0.55);
}
.plate::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  bottom: 16px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--cyan-2), var(--cyan-3));
}

.sec-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 12px;
  margin-bottom: 28px;
  border-bottom: 1px solid var(--line-soft);
}
.sec-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}
.sec-title {
  font-family: var(--font-display);
  font-size: clamp(1.28rem, 2vw, 1.7rem);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--text-strong);
}
.sec-note {
  margin-left: auto;
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--slate);
}

/* ---------- 10. 抽屉 / 表格 / 面包屑 / 正文 ---------- */
.drawer {
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(16, 41, 61, 0.45);
  overflow: hidden;
}
.drawer + .drawer { margin-top: 10px; }

.drawer__head {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: 17px 20px;
  text-align: left;
  font-size: 15.5px;
  font-weight: 600;
  color: var(--cream);
  letter-spacing: 0.02em;
  transition: background-color 0.2s ease;
}
.drawer__head:hover { background: rgba(33, 230, 193, 0.06); }

.drawer__index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.drawer__sign {
  position: relative;
  flex: none;
  width: 18px;
  height: 18px;
  margin-left: auto;
}
.drawer__sign::before,
.drawer__sign::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  border-radius: 2px;
}
.drawer__sign::before { left: 0; right: 0; top: 8px; height: 1.5px; }
.drawer__sign::after {
  top: 0;
  bottom: 0;
  left: 8px;
  width: 1.5px;
  transition: transform 0.24s var(--ease-out), opacity 0.24s ease;
}
.drawer[data-open="true"] .drawer__sign::after { transform: scaleY(0); opacity: 0; }

.drawer__body {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.24s var(--ease-out);
}
.drawer__body > * { overflow: hidden; }
.drawer[data-open="true"] .drawer__body { grid-template-rows: 1fr; }
.drawer__body > * > * { padding: 0 20px; }
.drawer__body > * > *:last-child { padding-bottom: 20px; }
.drawer__body p { font-size: 15.5px; color: var(--slate); }

.table { font-size: 15px; }
.table th,
.table td {
  padding: 13px 16px;
  text-align: left;
  border-bottom: 1px solid var(--line-soft);
  vertical-align: top;
}
.table thead th {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--slate);
  border-bottom-color: var(--line);
}
.table tbody tr:nth-child(odd) { background: rgba(16, 41, 61, 0.4); }
.table td.num {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  color: var(--cyan);
  white-space: nowrap;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--slate);
}
.breadcrumb li { display: flex; align-items: center; gap: 10px; }
.breadcrumb li + li::before { content: "/"; color: var(--rule); }
.breadcrumb a { color: var(--slate); }
.breadcrumb a:hover { color: var(--cyan); }
.breadcrumb [aria-current="page"] { color: var(--cream); }

.prose { max-width: 42em; }
.prose > * + * { margin-top: 1.05em; }
.prose h2 { margin-top: 2.4em; }
.prose h3 { margin-top: 1.8em; }
.prose p { font-size: 17px; }
.prose a {
  color: var(--cyan);
  border-bottom: 1px solid rgba(33, 230, 193, 0.35);
}
.prose a:hover { border-bottom-color: var(--cyan); }
.prose ul,
.prose ol { padding-left: 1.2em; }
.prose ul { list-style: none; padding-left: 0; }
.prose ul li { position: relative; padding-left: 20px; }
.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.82em;
  width: 9px;
  height: 1px;
  background: var(--cyan);
}
.prose ol { list-style: decimal; }
.prose li + li { margin-top: 0.4em; }
.prose blockquote {
  padding-left: 20px;
  border-left: 2px solid var(--cyan);
  font-family: var(--font-serif);
  font-size: 1.15rem;
  color: var(--cream);
}

/* ---------- 11. 图片容器基础规则 ---------- */
.frame {
  position: relative;
  display: block;
  overflow: hidden;
  isolation: isolate;
  aspect-ratio: 16 / 10;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background-color: var(--ink-2);
  background-image:
    radial-gradient(120% 100% at 15% 0%, rgba(59, 240, 208, 0.2), transparent 58%),
    radial-gradient(100% 100% at 100% 100%, rgba(255, 138, 61, 0.13), transparent 62%),
    linear-gradient(160deg, #14344C, #05101A);
}
.frame > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.frame::after {
  content: "";
  position: absolute;
  inset: 12px;
  border: 1px dashed rgba(33, 230, 193, 0.22);
  border-radius: calc(var(--r-lg) - 10px);
  pointer-events: none;
}
.frame--wide { aspect-ratio: 21 / 9; }
.frame--tall { aspect-ratio: 4 / 5; }
.frame--square { aspect-ratio: 1 / 1; }
.frame--plain { background-image: none; }
.frame--plain::after { display: none; }

.figure { margin: 0; }
.figure > .frame { margin-bottom: 12px; }
.figure figcaption {
  padding-left: 10px;
  border-left: 2px solid var(--rule);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--slate);
}

/* ---------- 12. 头部 ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 120;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}
.site-header[data-scrolled="true"] {
  background: rgba(10, 26, 40, 0.96);
  border-bottom-color: var(--line);
  box-shadow: 0 14px 36px rgba(3, 10, 16, 0.45);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: clamp(16px, 3vw, 40px);
  min-height: 78px;
  padding-block: 12px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: none;
}
.brand-copy {
  display: flex;
  flex-direction: column;
  gap: 2px;
  line-height: 1.15;
}
.brand-name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--cream);
}
.brand-sub {
  max-height: 20px;
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
  transition: max-height 0.3s ease, opacity 0.3s ease, transform 0.3s ease;
}
.site-header[data-scrolled="true"] .brand-sub {
  max-height: 0;
  opacity: 0;
  transform: translateY(-4px);
}

.site-nav {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: clamp(14px, 2vw, 32px);
  margin-left: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.6vw, 26px);
}
.nav-link {
  position: relative;
  display: inline-block;
  padding: 8px 2px;
  font-size: 14.5px;
  letter-spacing: 0.06em;
  white-space: nowrap;
  color: var(--slate);
  transition: color 0.2s ease;
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 2px;
  height: 1px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 0.24s var(--ease-out);
}
.nav-link:hover,
.nav-link:focus-visible { color: var(--cream); }
.nav-link:hover::after,
.nav-link:focus-visible::after { transform: scaleX(1); }
.nav-link[aria-current="page"] { color: var(--cyan); }
.nav-link[aria-current="page"]::after { transform: scaleX(1); }

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  padding: 9px 16px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  background: rgba(5, 16, 26, 0.6);
  color: var(--cream);
  font-size: 13px;
  letter-spacing: 0.14em;
}
.nav-toggle-box {
  display: grid;
  gap: 4px;
  width: 18px;
}
.nav-toggle-line {
  display: block;
  height: 1.5px;
  width: 100%;
  border-radius: 2px;
  background: var(--cyan);
  transition: transform 0.24s var(--ease-out), opacity 0.2s ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-line:first-child {
  transform: translateY(2.75px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-line:last-child {
  transform: translateY(-2.75px) rotate(-45deg);
}
.nav-toggle-text { line-height: 1; }

.nav-scrim {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 1;
  background: rgba(5, 16, 26, 0.74);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.28s ease;
}
.nav-scrim[data-open="true"] { opacity: 1; pointer-events: auto; }

.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  display: block;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--cyan-2), var(--cyan) 55%, var(--amber));
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}
.site-header[data-scrolled="true"] .scroll-progress { opacity: 0.9; }

/* ---------- 13. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(64px, 10vw, 140px);
  background: var(--bg-deep);
  border-top: 1px solid var(--line);
  color: var(--slate);
}
.footer-scale {
  height: 12px;
  border-bottom: 1px solid rgba(28, 74, 102, 0.35);
  background-image: repeating-linear-gradient(
    to right,
    rgba(28, 74, 102, 0.95) 0 1px,
    transparent 1px 22px
  );
  opacity: 0.85;
}

.footer-inner { padding-block: clamp(40px, 6vw, 68px) 28px; }

.footer-lead {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  gap: clamp(24px, 4vw, 56px);
  padding-bottom: clamp(28px, 4vw, 46px);
  border-bottom: 1px solid var(--line-soft);
}

.footer-brand-block { display: block; }
.footer-brand {
  display: flex;
  align-items: center;
  gap: 14px;
}
.footer-brand-text {
  display: flex;
  flex-direction: column;
  gap: 3px;
}
.footer-brand-name {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--cream);
}
.footer-brand-sub {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}
.footer-brand-desc {
  max-width: 34em;
  margin-top: 18px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--slate);
}

.footer-subscribe {
  position: relative;
  padding: clamp(20px, 2.6vw, 30px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background:
    radial-gradient(120% 130% at 100% 0%, rgba(59, 240, 208, 0.13), transparent 62%),
    linear-gradient(180deg, rgba(16, 41, 61, 0.72), rgba(10, 26, 40, 0.6));
}
.footer-kicker {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}
.footer-sub-text {
  margin-top: 12px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--slate);
}
.footer-mail {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 16px;
  padding: 10px 14px;
  border: 1px dashed rgba(33, 230, 193, 0.35);
  border-radius: var(--r-sm);
  background: rgba(33, 230, 193, 0.05);
}
.footer-mail-key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--slate);
}
.footer-mail-val {
  font-family: var(--font-mono);
  font-size: 13.5px;
  letter-spacing: 0.02em;
  color: var(--cyan);
  word-break: break-all;
}
.footer-subscribe .btn { margin-top: 18px; }

.footer-cols {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(22px, 3vw, 40px);
  padding-block: clamp(30px, 4vw, 46px);
  border-bottom: 1px solid var(--line-soft);
}
.footer-col-title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}
.footer-links { display: grid; gap: 10px; }
.footer-links a {
  display: inline-block;
  font-size: 14.5px;
  color: var(--slate);
  transition: color 0.2s ease, transform 0.2s ease;
}
.footer-links a:hover { color: var(--cream); transform: translateX(3px); }

.contact-list { display: grid; gap: 12px; }
.contact-list li {
  display: grid;
  grid-template-columns: 50px minmax(0, 1fr);
  gap: 10px;
  font-size: 14px;
  line-height: 1.65;
}
.contact-key {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--slate);
  opacity: 0.72;
}
.contact-val {
  color: var(--slate);
  word-break: break-word;
}
.contact-val--mono {
  font-family: var(--font-mono);
  letter-spacing: 0.03em;
  color: var(--cream);
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 26px;
  padding-top: 22px;
  font-size: 13px;
  color: var(--slate);
}
.footer-copy { flex: 1 1 260px; margin: 0; }
.footer-icp {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--slate);
}
.icp-dot {
  flex: none;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cinnabar);
  box-shadow: 0 0 0 3px rgba(200, 64, 47, 0.2);
}
.footer-note {
  flex: 1 1 100%;
  font-size: 12.5px;
  color: var(--slate-2);
}

/* ---------- 14. 显现与光晕 ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.5s ease, transform 0.5s var(--ease-out);
}
.js [data-reveal][data-revealed="true"] {
  opacity: 1;
  transform: none;
}

@keyframes halo-drift {
  0%, 100% { transform: translate3d(0, 0, 0) scale(1); }
  50% { transform: translate3d(2.5%, -2%, 0) scale(1.06); }
}
.halo-drift { animation: halo-drift 20s ease-in-out infinite; }

/* ---------- 15. 响应式 ---------- */
@media (max-width: 1080px) {
  .nav-list { gap: 12px; }
  .nav-link { font-size: 13.5px; }
  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 940px) {
  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    z-index: 2;
    width: min(88vw, 360px);
    margin-left: 0;
    padding: 96px 26px 36px;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 26px;
    overflow-y: auto;
    background: var(--deepest);
    border-left: 1px solid var(--line);
    transform: translateX(102%);
    transition: transform 0.28s var(--ease-out);
  }
  .site-nav[data-open="true"] { transform: translateX(0); }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }
  .nav-list li { border-bottom: 1px solid var(--line-soft); }
  .nav-link {
    display: block;
    padding: 15px 4px;
    font-size: 16px;
    letter-spacing: 0.1em;
  }
  .nav-link::after { display: none; }
  .nav-link[aria-current="page"] { color: var(--cyan); }
  .nav-link[aria-current="page"]::before {
    content: "▍";
    margin-right: 8px;
    color: var(--cyan);
  }

  .nav-actions { flex-direction: column; align-items: stretch; }
  .nav-actions .btn { width: 100%; }

  .nav-scrim { display: block; }

  .footer-lead { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 900px) {
  .grid-12 > [class^="col-"] { grid-column: span 12; }
  .sec-note { margin-left: 0; flex-basis: 100%; }
}

@media (max-width: 720px) {
  body {
    font-size: 16px;
    background-size: 56px 56px, 56px 56px;
    background-attachment: scroll;
  }
  h1 { letter-spacing: 0.08em; }
  .page-top { padding-top: 118px; }
  .header-inner { min-height: 68px; }
  .brand-mark { width: 38px; height: 38px; border-radius: 12px; }
  .footer-scale { background-size: auto; }
}

@media (max-width: 560px) {
  .footer-cols { grid-template-columns: minmax(0, 1fr); }
  .footer-base { font-size: 12.5px; }
  .contact-list li { grid-template-columns: 44px minmax(0, 1fr); }
  .table th, .table td { padding: 11px 12px; }
}

/* ---------- 16. 减少动效 ---------- */
@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;
    transition-delay: 0ms !important;
  }
  .halo-drift { animation: none !important; }
  .js [data-reveal] { opacity: 1 !important; transform: none !important; }
  .site-header[data-scrolled="true"] .brand-sub { opacity: 1; transform: none; }
}