/* =========================================================
   亚虎 · 共享样式表  /assets/site.css
   虎纹琥珀橙 × 深炭黑 · 昼夜双色域 · 纸张叠层印刷感
   ========================================================= */

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

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

body { margin: 0; }

h1, h2, h3, h4, h5, h6,
p, figure, blockquote, dl, dd, pre { margin: 0; }

ul, ol { padding: 0; list-style: none; }

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

a { color: inherit; text-decoration: none; }

table { width: 100%; border-collapse: collapse; }

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

::selection { background: var(--amber); color: #17110A; }

/* ---------- 2. 设计变量 ---------- */
:root {
  /* 昼夜双色域 */
  --ink: #12100C;
  --ink-2: #1E1A14;
  --paper: #F6F1E7;
  --sand: #E7DFD1;
  --amber: #E1781F;
  --amber-deep: #B4500F;
  --amber-gold: #F2B45A;
  --night: #16264A;
  --night-soft: #3D5A96;
  --safe: #2F7D5E;
  --mute: #8C8375;

  /* 线与边界 */
  --line: rgba(18, 16, 12, .14);
  --line-strong: rgba(18, 16, 12, .3);
  --line-paper: rgba(246, 241, 231, .14);

  /* 骨架尺寸 */
  --rail-w: 88px;
  --topbar-h: 88px;
  --maxw: 1380px;
  --gutter: clamp(18px, 3.2vw, 56px);

  /* 字体 */
  --sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei",
          system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --fs-display: clamp(2.75rem, 8.5vw, 7rem);
  --fs-h2: clamp(1.45rem, 2.8vw, 2.1rem);
  --fs-h3: clamp(1.125rem, 1.6vw, 1.4rem);
  --fs-body: 16.5px;
  --lh-body: 1.8;

  /* 运动 */
  --ease: cubic-bezier(.22, .61, .36, 1);
  --shadow-paper: 0 1px 0 rgba(18, 16, 12, .05), 0 14px 34px -26px rgba(18, 16, 12, .6);
}

@media (max-width: 1023px) {
  :root {
    --topbar-h: 62px;
    --fs-body: 16px;
  }
}

/* ---------- 3. 基础排版 ---------- */
body {
  font-family: var(--sans);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  font-weight: 400;
  color: var(--ink);
  background: var(--paper);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: .005em;
}

h1 { font-size: clamp(1.7rem, 3.4vw, 2.6rem); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); }

p { text-wrap: pretty; }

.display {
  font-weight: 200;
  font-size: var(--fs-display);
  line-height: .95;
  letter-spacing: .01em;
  text-wrap: balance;
}

.mono {
  font-family: var(--mono);
  font-weight: 600;
  letter-spacing: .01em;
}

.muted { color: var(--mute); }

.section--ink .muted,
.section--night .muted,
.site-footer .muted { color: rgba(246, 241, 231, .55); }

/* 主内容让位给固定壳体 */
main {
  display: block;
  padding-top: var(--topbar-h);
}

#main-content {
  scroll-margin-top: calc(var(--topbar-h) + 12px);
}

@media (min-width: 1024px) {
  body { padding-left: var(--rail-w); }
}

/* ---------- 4. 布局容器 ---------- */
.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.wrap--narrow { max-width: 920px; }

.section { padding-block: clamp(46px, 7vw, 108px); }
.section--tight { padding-block: clamp(28px, 4vw, 56px); }
.section--sand { background: var(--sand); }
.section--ink { background: var(--ink); color: var(--paper); }
.section--night {
  background: linear-gradient(155deg, var(--ink) 0%, var(--night) 62%, #0F1B36 100%);
  color: var(--paper);
}

.section--ink a,
.section--night a { color: var(--amber-gold); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: clamp(20px, 3vw, 40px);
}

/* ---------- 5. 栅格 ---------- */
.grid {
  display: grid;
  gap: clamp(16px, 2.2vw, 32px);
}

.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: span 8; }
.col-9 { grid-column: span 9; }
.col-12 { grid-column: span 12; }

@media (max-width: 1000px) {
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 900px) {
  .grid--12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .col-3, .col-4, .col-5 { grid-column: span 6; }
  .col-6, .col-7, .col-8, .col-9, .col-12 { grid-column: span 6; }
}

@media (max-width: 620px) {
  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: minmax(0, 1fr); }
  .col-3, .col-4, .col-5, .col-6,
  .col-7, .col-8, .col-9, .col-12 { grid-column: 1 / -1; }
}

/* ---------- 6. 索引标签 / 按钮 / 标签戳 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--amber-deep);
}

.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: currentColor;
  opacity: .75;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .06em;
  line-height: 1.2;
  border: 1px solid transparent;
  transition: background-color .25s var(--ease), color .25s var(--ease),
              border-color .25s var(--ease), transform .25s var(--ease);
}

.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn--primary { background: var(--amber); color: #17110A; }
.btn--primary:hover { background: var(--amber-deep); color: var(--paper); }

.btn--ghost {
  border-color: rgba(246, 241, 231, .32);
  color: var(--paper);
}
.btn--ghost:hover {
  border-color: var(--amber-gold);
  color: var(--amber-gold);
  background: rgba(242, 180, 90, .08);
}

.btn--outline {
  border-color: var(--line-strong);
  color: var(--ink);
}
.btn--outline:hover {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

.btn--sm {
  padding: 8px 14px;
  font-size: 13px;
  font-weight: 400;
  letter-spacing: .08em;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  border: 1px solid var(--line-strong);
  color: var(--ink);
}

.tag--amber {
  color: var(--amber-deep);
  border-color: var(--amber);
  background: rgba(225, 120, 31, .08);
}

.tag--safe {
  color: var(--safe);
  border-color: rgba(47, 125, 94, .5);
  background: rgba(47, 125, 94, .08);
}

.tag--night {
  color: #A9BCE4;
  border-color: rgba(61, 90, 150, .6);
  background: rgba(22, 38, 74, .5);
}

/* ---------- 7. 纸张叠层卡片 ---------- */
.paper {
  position: relative;
  background: var(--paper);
  border: 1px solid var(--line);
  padding: clamp(18px, 2.2vw, 30px);
  box-shadow: var(--shadow-paper);
  transition: transform .25s var(--ease), border-color .25s var(--ease);
}

.paper:hover {
  transform: translateY(-2px);
  border-color: var(--line-strong);
}

.paper--stack { box-shadow: 7px 7px 0 0 var(--sand), var(--shadow-paper); }

.paper--ink {
  background: var(--ink-2);
  border-color: rgba(246, 241, 231, .12);
  color: var(--paper);
  box-shadow: none;
}

.paper--double { border: 3px double var(--line-strong); }

/* ---------- 8. 数据条 ---------- */
.data-list { display: flex; flex-direction: column; }

.data-row {
  display: grid;
  grid-template-columns: minmax(78px, auto) minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  padding: 11px 0;
  border-bottom: 1px dashed var(--line);
}

.data-row:last-child { border-bottom: 0; }

.data-key {
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--mute);
}

.data-val {
  font-family: var(--mono);
  font-weight: 600;
  font-size: 15px;
}

.data-bar {
  position: relative;
  height: 6px;
  background: var(--sand);
  overflow: hidden;
}

.data-fill {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--v, 0%);
  background: linear-gradient(90deg, var(--amber), var(--amber-gold));
}

/* ---------- 9. 时段刻度 / 夜间纹理 ---------- */
.scale-strip {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 3px;
}

@media (max-width: 720px) {
  .scale-strip { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

.tiger-arcs {
  position: relative;
  overflow: hidden;
}

.tiger-arcs::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-radial-gradient(circle at 88% 118%,
    rgba(225, 120, 31, .16) 0 1px, transparent 1px 22px);
}

/* ---------- 10. 图片容器基础规则 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  background: linear-gradient(140deg, var(--sand), #DCD2C0);
  border: 1px solid var(--line);
}

.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame--wide { aspect-ratio: 16 / 9; }
.media-frame--banner { aspect-ratio: 21 / 9; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--portrait { aspect-ratio: 4 / 5; }
.media-frame--tall { aspect-ratio: 3 / 4; }

.media-frame--night {
  background: linear-gradient(150deg, var(--ink), var(--night));
  border-color: rgba(61, 90, 150, .5);
}

.media-frame--pattern::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(118deg,
    rgba(18, 16, 12, .07) 0 1px, transparent 1px 18px);
}

.media-frame__label {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 6px 12px;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .14em;
}

.media-frame__note {
  padding: 10px 2px 0;
  font-size: 13px;
  color: var(--mute);
}

/* ---------- 11. 面包屑 ---------- */
.breadcrumbs {
  font-size: 13px;
  color: var(--mute);
  margin-bottom: clamp(18px, 2.5vw, 34px);
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 8px;
}

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

.breadcrumbs li + li::before {
  content: "／";
  color: rgba(18, 16, 12, .28);
}

.breadcrumbs a {
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.breadcrumbs a:hover {
  color: var(--amber-deep);
  border-bottom-color: var(--amber);
}

.breadcrumbs [aria-current="page"] {
  color: var(--ink);
  font-weight: 700;
}

/* ---------- 12. 正文容器 ---------- */
.prose { max-width: 68ch; }
.prose > * + * { margin-top: 1.05em; }
.prose h2 { font-size: var(--fs-h2); margin-top: 1.8em; }
.prose h3 { font-size: var(--fs-h3); margin-top: 1.5em; }
.prose ul,
.prose ol { padding-left: 1.25em; }
.prose ul { list-style: square; }
.prose ol { list-style: decimal; }
.prose li + li { margin-top: .45em; }
.prose a {
  color: var(--amber-deep);
  border-bottom: 1px solid rgba(180, 80, 15, .35);
}
.prose a:hover { border-bottom-color: var(--amber-deep); }
.prose strong { font-weight: 700; }
.prose code {
  font-family: var(--mono);
  font-size: .92em;
  background: var(--sand);
  padding: .1em .4em;
}

/* =========================================================
   13. 页头
   ========================================================= */
.site-header {
  position: relative;
  z-index: 40;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 200;
  transform: translateY(-220%);
  padding: 10px 16px;
  background: var(--ink);
  color: var(--paper);
  font-size: 14px;
  letter-spacing: .06em;
  transition: transform .25s var(--ease);
}

.skip-link:focus { transform: none; }

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  width: 0;
  z-index: 50;
  pointer-events: none;
  background: linear-gradient(90deg, var(--amber), var(--amber-gold));
  transition: width .12s linear;
}

/* 左侧竖向轨道 · 品牌方块 */
.rail-brand {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 43;
  width: var(--rail-w);
  height: var(--topbar-h);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 7px;
  background: var(--ink);
  color: var(--paper);
  border-right: 1px solid rgba(246, 241, 231, .08);
  border-bottom: 1px solid rgba(246, 241, 231, .08);
}

.rail-mark {
  font-size: 28px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--amber-gold);
  transition: color .25s var(--ease);
}

.rail-brand:hover .rail-mark { color: #FFD79A; }

.rail-bar {
  display: block;
  width: 22px;
  height: 3px;
  background: var(--amber);
}

/* 顶部细条 */
.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 44;
  height: var(--topbar-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding-inline: var(--gutter);
  background: rgba(246, 241, 231, .9);
  border-bottom: 1px solid var(--line);
  backdrop-filter: saturate(140%) blur(10px);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
}

.topbar-brand {
  display: flex;
  align-items: baseline;
  gap: 14px;
  min-width: 0;
}

.brand-line {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .04em;
  white-space: nowrap;
}

.brand-line::before {
  content: "";
  display: inline-block;
  width: 14px;
  height: 3px;
  margin-right: 8px;
  vertical-align: middle;
  background: var(--amber);
}

.brand-tagline {
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--mute);
  white-space: nowrap;
}

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

.quick-link {
  display: inline-flex;
  align-items: center;
  padding: 9px 14px;
  font-size: 13px;
  letter-spacing: .06em;
  border: 1px solid var(--line-strong);
  color: var(--ink);
  transition: background-color .25s var(--ease), color .25s var(--ease),
              border-color .25s var(--ease), transform .25s var(--ease);
}

.quick-link:hover {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
  transform: translateY(-2px);
}

.quick-link--amber {
  background: var(--amber);
  border-color: var(--amber);
  color: #17110A;
  font-weight: 700;
}

.quick-link--amber:hover {
  background: var(--amber-deep);
  border-color: var(--amber-deep);
  color: var(--paper);
}

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 12px;
  border: 1px solid var(--line-strong);
  font-size: 13px;
  letter-spacing: .08em;
}

.nav-toggle-bars {
  position: relative;
  display: block;
  width: 16px;
  height: 2px;
  background: var(--ink);
  transition: background-color .3s var(--ease);
}

.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  background: var(--ink);
  transition: transform .3s var(--ease), top .3s var(--ease);
}

.nav-toggle-bars::before { top: -5px; }
.nav-toggle-bars::after { top: 5px; }

.nav-toggle[aria-expanded="true"] .nav-toggle-bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before { top: 0; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after { top: 0; transform: rotate(-45deg); }

.nav-toggle-text { white-space: nowrap; }

/* 导航本体：桌面 = 左侧轨道，移动 = 抽屉 */
.site-nav {
  position: fixed;
  top: var(--topbar-h);
  left: 0;
  bottom: 0;
  z-index: 42;
  width: var(--rail-w);
  display: flex;
  flex-direction: column;
  background: var(--ink);
  color: var(--paper);
  border-right: 1px solid rgba(246, 241, 231, .08);
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: none;
  transition: transform .45s var(--ease);
}

.site-nav::-webkit-scrollbar { width: 0; height: 0; }

.nav-head { display: none; }

.nav-head-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: rgba(242, 180, 90, .9);
}

.nav-close {
  padding: 6px 12px;
  font-size: 12px;
  letter-spacing: .16em;
  border: 1px solid rgba(246, 241, 231, .24);
  color: rgba(246, 241, 231, .8);
  transition: border-color .25s var(--ease), color .25s var(--ease);
}

.nav-close:hover {
  border-color: var(--amber);
  color: var(--amber-gold);
}

.nav-list {
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 22px;
  padding: 28px 0;
}

.nav-link {
  position: relative;
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  font-size: 12.5px;
  letter-spacing: .18em;
  line-height: 1.2;
  color: rgba(246, 241, 231, .62);
  transition: color .25s var(--ease), background-color .25s var(--ease);
}

.nav-link:hover { color: var(--amber-gold); }

.nav-index {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: .08em;
  color: rgba(225, 120, 31, .9);
}

.nav-label { white-space: nowrap; }

.nav-link[aria-current="page"] { color: var(--paper); }
.nav-link[aria-current="page"] .nav-index { color: var(--amber-gold); }

.nav-link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 4px;
  right: 4px;
  bottom: -2px;
  height: 2px;
  background: var(--amber);
}

.nav-foot { display: none; }

.nav-foot-line {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: .04em;
}

.nav-foot-note {
  margin-top: 6px;
  font-size: 12px;
  line-height: 1.6;
}

.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: 65;
  background: rgba(12, 10, 7, .66);
  opacity: 0;
  pointer-events: none;
  transition: opacity .3s var(--ease);
}

.nav-scrim[data-open] {
  opacity: 1;
  pointer-events: auto;
}

body.nav-open { overflow: hidden; }

/* 桌面端：竖排轨道 */
@media (min-width: 1024px) {
  .topbar { left: var(--rail-w); }
  .scroll-progress { left: var(--rail-w); }
  .nav-toggle { display: none; }

  .nav-link {
    writing-mode: vertical-rl;
    text-orientation: upright;
    padding: 10px 4px;
    letter-spacing: .16em;
  }

  .nav-link[aria-current="page"]::after {
    left: 2px;
    right: 2px;
    bottom: -1px;
  }
}

/* 移动端：抽屉 */
@media (max-width: 1023px) {
  .rail-brand { display: none; }
  .nav-toggle { display: inline-flex; }

  .site-nav {
    top: 0;
    bottom: 0;
    z-index: 70;
    width: min(340px, 88vw);
    padding-bottom: 22px;
    transform: translateX(-102%);
    box-shadow: 34px 0 70px -40px rgba(0, 0, 0, .78);
    border-right: 1px solid rgba(246, 241, 231, .12);
  }

  .site-nav[data-open] { transform: none; }

  .nav-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 18px var(--gutter) 16px;
    border-bottom: 1px solid rgba(246, 241, 231, .1);
  }

  .nav-list {
    flex: 0 0 auto;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    padding: 6px 0 0;
  }

  .nav-link {
    padding: 15px var(--gutter);
    font-size: 15px;
    letter-spacing: .1em;
    gap: 12px;
    border-bottom: 1px solid rgba(246, 241, 231, .07);
  }

  .nav-index { font-size: 11px; }

  .nav-link[aria-current="page"] {
    background: rgba(225, 120, 31, .14);
    color: var(--amber-gold);
  }

  .nav-link[aria-current="page"]::after { display: none; }

  .nav-foot {
    display: block;
    margin-top: auto;
    padding: 18px var(--gutter) 0;
    border-top: 1px solid rgba(246, 241, 231, .1);
    font-size: 12px;
    letter-spacing: .04em;
    color: rgba(246, 241, 231, .5);
  }

  .nav-foot-line { color: rgba(246, 241, 231, .86); }
}

@media (max-width: 760px) {
  .brand-tagline { display: none; }
}

@media (max-width: 640px) {
  .quick-link:not(.quick-link--amber) { display: none; }
}

/* =========================================================
   14. 页脚
   ========================================================= */
.site-footer {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--paper);
  padding-top: clamp(44px, 6vw, 88px);
}

.site-footer::before {
  content: "";
  position: absolute;
  left: -10%;
  right: -10%;
  bottom: -42%;
  height: 84%;
  pointer-events: none;
  background: repeating-radial-gradient(circle at 50% 120%,
    rgba(225, 120, 31, .13) 0 1px, transparent 1px 24px);
}

.footer-stripe {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 5px;
  opacity: .85;
  background: repeating-linear-gradient(90deg,
    var(--amber) 0 30px, var(--ink) 30px 38px,
    var(--amber-gold) 38px 62px, var(--ink) 62px 70px,
    var(--night-soft) 70px 96px, var(--ink) 96px 104px);
}

.footer-inner,
.footer-contact,
.footer-base {
  position: relative;
  z-index: 1;
}

.footer-inner {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
  padding-bottom: clamp(30px, 4vw, 56px);
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 8fr);
  gap: clamp(28px, 4vw, 72px);
}

.footer-mark {
  font-size: clamp(2rem, 4.4vw, 3.1rem);
  font-weight: 200;
  line-height: 1;
  letter-spacing: .06em;
  color: var(--paper);
}

.footer-mark::after {
  content: "";
  display: block;
  width: 56px;
  height: 3px;
  margin-top: 14px;
  background: linear-gradient(90deg, var(--amber), var(--amber-gold));
}

.footer-tagline {
  margin-top: 16px;
  font-size: 15px;
  letter-spacing: .1em;
  color: rgba(246, 241, 231, .74);
}

.footer-note {
  margin-top: 10px;
  max-width: 34ch;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--mute);
}

.footer-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 40px);
}

.footer-col-title {
  margin-bottom: 16px;
  padding-bottom: 12px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: rgba(246, 241, 231, .5);
  border-bottom: 1px solid rgba(246, 241, 231, .12);
}

.footer-links li + li { margin-top: 10px; }

.footer-links a {
  display: inline-block;
  padding-bottom: 2px;
  font-size: 14px;
  color: rgba(246, 241, 231, .78);
  border-bottom: 1px solid transparent;
  transition: color .22s var(--ease), border-color .22s var(--ease);
}

.footer-links a:hover {
  color: var(--amber-gold);
  border-bottom-color: rgba(242, 180, 90, .6);
}

.footer-contact {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding: clamp(22px, 3vw, 34px) var(--gutter);
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(16px, 2.4vw, 32px);
  border-top: 1px solid rgba(246, 241, 231, .12);
  border-bottom: 1px solid rgba(246, 241, 231, .12);
}

.footer-contact-label {
  display: block;
  margin-bottom: 8px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: rgba(242, 180, 90, .85);
}

.footer-contact-value {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(246, 241, 231, .82);
}

.footer-base {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding: clamp(18px, 2.4vw, 28px) var(--gutter) clamp(28px, 3.5vw, 46px);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--mute);
}

.footer-legal {
  font-family: var(--mono);
  letter-spacing: .06em;
}

.footer-copy {
  font-size: 12.5px;
  letter-spacing: .04em;
}

@media (max-width: 900px) {
  .footer-inner { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 1000px) {
  .footer-contact { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 560px) {
  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-contact { grid-template-columns: minmax(0, 1fr); }
}

/* =========================================================
   15. 滚动显现
   ========================================================= */
.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .45s var(--ease), transform .45s var(--ease);
  transition-delay: calc(var(--i, 0) * 70ms);
}

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

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

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }

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