/* ==========================================================================
   大发黄金主页 · 共享样式表 /assets/site.css
   负责 reset、变量、中文排版、头部、页脚、通用按钮与基础组件
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 104px;
}

body,
h1,
h2,
h3,
h4,
p,
figure,
blockquote,
dl,
dd,
ul,
ol {
  margin: 0;
}

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

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

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

table {
  border-collapse: collapse;
  border-spacing: 0;
}

/* 2. 变量
   ========================================================================== */
:root {
  /* 品牌色彩体系 */
  --obsidian: #0A0A0B;
  --graphite: #1C1D20;
  --slate: #33363A;
  --gold: #C9A227;
  --champagne: #E7D3A1;
  --amber: #B07320;
  --clay: #A05A3C;
  --moss: #5F6B4F;
  --ivory: #F6F1E6;
  --paper: #EDE6D8;

  /* 结构色 */
  --line-gold: rgba(201, 162, 39, 0.28);
  --line-gold-strong: rgba(201, 162, 39, 0.62);
  --line-soft: rgba(246, 241, 230, 0.12);
  --line-strong: rgba(246, 241, 230, 0.24);

  /* 文字色 */
  --text: var(--ivory);
  --text-muted: rgba(246, 241, 230, 0.66);
  --text-faint: rgba(246, 241, 230, 0.44);
  --text-ink: #14140F;
  --text-ink-muted: rgba(20, 20, 15, 0.68);

  /* 字体栈 */
  --font-display: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", Georgia, serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  /* 版心 */
  --wrap: 1180px;
  --wrap-wide: 1320px;

  /* 圆角 */
  --radius-sm: 10px;
  --radius: 16px;
  --radius-lg: 26px;
  --radius-pill: 999px;

  /* 间距 */
  --space-1: 6px;
  --space-2: 10px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 36px;
  --space-6: 56px;

  /* 阴影与缓动 */
  --shadow-card: 0 24px 48px -38px rgba(0, 0, 0, 0.95);
  --shadow-lift: 0 26px 44px -32px rgba(0, 0, 0, 0.9);
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* 3. 中文排版与基础
   ========================================================================== */
body {
  background-color: var(--obsidian);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  font-weight: 300;
  line-height: 1.14;
  letter-spacing: 0.02em;
  color: var(--ivory);
}

h1 {
  font-size: clamp(2.6rem, 8vw, 6.4rem);
  line-height: 1.05;
}

h2 {
  font-size: clamp(1.6rem, 3.6vw, 2.6rem);
}

h3 {
  font-size: clamp(1.15rem, 2vw, 1.5rem);
}

p {
  margin-bottom: 1em;
}

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

strong {
  font-weight: 500;
  color: var(--champagne);
}

a {
  color: var(--champagne);
  text-decoration: none;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

a:hover {
  color: var(--gold);
}

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

::selection {
  background: rgba(201, 162, 39, 0.3);
  color: var(--ivory);
}

/* 4. 跳转链接
   ========================================================================== */
.skip-link {
  position: fixed;
  left: 14px;
  top: -80px;
  z-index: 200;
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  background: var(--champagne);
  color: var(--text-ink);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.04em;
  transition: top 0.24s var(--ease);
}

.skip-link:focus {
  top: 14px;
  color: var(--text-ink);
}

/* 5. 头部 · 悬浮胶囊导航
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  padding: 14px clamp(12px, 3vw, 30px) 0;
  background: linear-gradient(180deg, rgba(10, 10, 11, 0.98) 0%, rgba(10, 10, 11, 0.86) 100%);
  transition: padding 0.35s var(--ease);
}

.site-header[data-scrolled="true"] {
  padding-top: 8px;
}

.nav-shell {
  position: relative;
  display: flex;
  align-items: center;
  gap: 16px;
  max-width: 1240px;
  min-height: 66px;
  margin: 0 auto;
  padding: 10px 18px 10px 22px;
  border: 1px solid var(--line-gold);
  border-radius: var(--radius-pill);
  background: rgba(28, 29, 32, 0.74);
  backdrop-filter: blur(14px) saturate(1.2);
  -webkit-backdrop-filter: blur(14px) saturate(1.2);
  box-shadow: 0 22px 46px -34px rgba(0, 0, 0, 0.95), inset 0 1px 0 rgba(231, 211, 161, 0.08);
  transition: max-width 0.4s var(--ease), min-height 0.4s var(--ease),
    background-color 0.4s var(--ease), border-color 0.4s var(--ease);
}

.site-header[data-scrolled="true"] .nav-shell {
  max-width: 1060px;
  min-height: 56px;
  background: rgba(16, 16, 18, 0.9);
  border-color: var(--line-gold-strong);
}

/* 品牌浮岛 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  color: var(--ivory);
}

.brand:hover {
  color: var(--ivory);
}

.brand__dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: radial-gradient(circle at 32% 30%, var(--champagne), var(--gold) 58%, var(--amber));
  box-shadow: 0 0 0 1px rgba(231, 211, 161, 0.35), 0 0 14px rgba(201, 162, 39, 0.5);
  flex-shrink: 0;
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand__mark {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 15px;
  letter-spacing: 0.06em;
  color: var(--ivory);
  transition: color 0.25s var(--ease);
}

.brand:hover .brand__mark {
  color: var(--champagne);
}

.brand__sub {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--text-faint);
}

/* 移动端开关 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  margin-left: auto;
  padding: 8px 15px;
  font-family: var(--font-body);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--champagne);
  background: rgba(201, 162, 39, 0.08);
  border: 1px solid var(--line-gold);
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: background-color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.nav-toggle:hover {
  background: rgba(201, 162, 39, 0.16);
  border-color: var(--line-gold-strong);
}

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 11px;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 1.5px;
  background: currentColor;
  transition: transform 0.3s var(--ease);
}

.nav-toggle__bars::before {
  top: 0;
}

.nav-toggle__bars::after {
  bottom: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before {
  transform: translateY(4.75px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after {
  transform: translateY(-4.75px) rotate(-45deg);
}

/* 主导航 */
.primary-nav {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-left: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-item {
  display: block;
}

.nav-link {
  display: inline-block;
  padding: 8px 13px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-size: 14px;
  color: var(--text-muted);
  white-space: nowrap;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease),
    background-color 0.25s var(--ease);
}

.nav-link:hover {
  color: var(--champagne);
  border-color: var(--line-gold);
  background: rgba(201, 162, 39, 0.07);
}

.nav-link[aria-current="page"] {
  color: var(--champagne);
  border-color: var(--line-gold-strong);
  background: rgba(201, 162, 39, 0.1);
}

.nav-utility {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* 阅读进度线 */
.nav-progress {
  position: absolute;
  left: 18%;
  right: 18%;
  bottom: 3px;
  height: 2px;
  border-radius: var(--radius-pill);
  background: linear-gradient(90deg, var(--amber), var(--gold) 55%, var(--champagne));
  transform: scaleX(0);
  transform-origin: left center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s var(--ease);
}

.site-header[data-scrolled="true"] .nav-progress {
  opacity: 0.95;
}

/* 6. 页脚
   ========================================================================== */
.site-footer {
  position: relative;
  margin-top: clamp(60px, 9vw, 140px);
  padding-top: clamp(40px, 6vw, 72px);
  border-top: 1px solid var(--line-soft);
  background:
    radial-gradient(120% 80% at 10% -12%, rgba(201, 162, 39, 0.13), transparent 62%),
    linear-gradient(180deg, #141416 0%, var(--obsidian) 72%);
  color: var(--text-muted);
  font-size: 14px;
}

.site-footer::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: -1px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--champagne) 45%, transparent);
  opacity: 0.55;
}

.footer-inner {
  display: grid;
  grid-template-columns: 5fr 8fr;
  gap: clamp(24px, 5vw, 64px);
  align-items: start;
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 clamp(16px, 4vw, 32px) clamp(30px, 4vw, 46px);
}

.footer-brand__mark {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.1rem, 2vw, 1.4rem);
  letter-spacing: 0.04em;
  line-height: 1.3;
  color: var(--ivory);
  margin-bottom: 8px;
}

.footer-brand__sub {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 18px;
}

.footer-brand__region {
  font-size: 13px;
  color: var(--text-faint);
  margin-bottom: 22px;
}

.footer-brand__cta {
  align-self: flex-start;
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(18px, 3vw, 34px);
}

.footer-col__title {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 14px;
}

.footer-col__list {
  display: grid;
  gap: 10px;
}

.footer-col__list a {
  display: inline-block;
  color: var(--text-muted);
  font-size: 14px;
  border-bottom: 1px solid transparent;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.footer-col__list a:hover {
  color: var(--champagne);
  border-bottom-color: var(--line-gold-strong);
}

.footer-contact {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 20px clamp(16px, 4vw, 32px);
  border-top: 1px solid var(--line-soft);
}

.footer-contact__line {
  font-size: 13px;
  line-height: 1.9;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.footer-contact__note {
  font-size: 12px;
  color: var(--text-faint);
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  align-items: center;
  justify-content: space-between;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 16px clamp(16px, 4vw, 32px) 30px;
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--text-faint);
}

.footer-base__copy,
.footer-base__icp {
  margin: 0;
}

/* 7. 通用按钮
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.04em;
  line-height: 1.4;
  cursor: pointer;
  text-align: center;
  transition: color 0.25s var(--ease), background-color 0.25s var(--ease),
    border-color 0.25s var(--ease), box-shadow 0.25s var(--ease),
    transform 0.25s var(--ease);
}

.btn--sm {
  padding: 7px 15px;
  font-size: 13px;
}

.btn--gold {
  background: linear-gradient(135deg, var(--champagne) 0%, var(--gold) 55%, var(--amber) 100%);
  color: var(--text-ink);
  border-color: rgba(231, 211, 161, 0.5);
}

.btn--gold:hover {
  color: var(--text-ink);
  box-shadow: 0 12px 28px -14px rgba(201, 162, 39, 0.85);
  transform: translateY(-1px);
}

.btn--ghost {
  background: transparent;
  color: var(--champagne);
  border-color: var(--line-gold);
}

.btn--ghost:hover {
  color: var(--champagne);
  border-color: var(--line-gold-strong);
  background: rgba(201, 162, 39, 0.1);
}

/* 8. 容器与排版组件
   ========================================================================== */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 32px);
}

.wrap--wide {
  max-width: var(--wrap-wide);
}

.section {
  padding-block: clamp(48px, 7vw, 96px);
}

.block-head {
  display: grid;
  gap: 10px;
  max-width: 64ch;
  margin-bottom: clamp(24px, 3.4vw, 42px);
}

.index-label {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--gold);
}

.block-title {
  margin: 0;
}

.block-lead {
  color: var(--text-muted);
  font-size: 16px;
}

.lead {
  font-size: clamp(1rem, 1.4vw, 1.125rem);
  line-height: 1.85;
  color: var(--text-muted);
}

.link-more {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--champagne);
  border-bottom: 1px solid var(--line-gold);
  padding-bottom: 2px;
}

.link-more::after {
  content: "→";
  font-family: var(--font-mono);
  font-size: 13px;
  transition: transform 0.25s var(--ease);
}

.link-more:hover::after {
  transform: translateX(3px);
}

.rule-gold {
  height: 1px;
  border: 0;
  margin: clamp(28px, 4vw, 52px) 0;
  background: linear-gradient(90deg, transparent, var(--line-gold-strong) 22%, var(--line-gold-strong) 78%, transparent);
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--text-faint);
  padding-block: 18px;
}

.breadcrumb a {
  color: var(--text-muted);
}

.breadcrumb a:hover {
  color: var(--gold);
}

.breadcrumb__sep {
  color: var(--slate);
}

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

/* 9. 网格
   ========================================================================== */
.grid {
  display: grid;
  gap: clamp(16px, 2.2vw, 26px);
}

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

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

.grid--split {
  grid-template-columns: 8fr 5fr;
  align-items: start;
}

.grid--asym {
  grid-template-columns: 5fr 8fr;
  align-items: start;
}

.stack {
  display: grid;
  gap: var(--space-4);
}

/* 10. 档案卡
   ========================================================================== */
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(20px, 2.4vw, 28px);
  border: 1px solid var(--line-gold);
  border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(28, 29, 32, 0.95) 0%, rgba(18, 18, 20, 0.96) 100%);
  box-shadow: var(--shadow-card);
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease),
    box-shadow 0.3s var(--ease);
}

.card:hover {
  transform: translateY(-3px);
  border-color: var(--line-gold-strong);
  box-shadow: var(--shadow-lift);
}

.card--paper {
  background: var(--paper);
  border-color: rgba(28, 29, 32, 0.16);
  color: var(--text-ink);
}

.card--paper .card__title,
.card--paper h3 {
  color: #1C1D20;
}

.card--paper .card__text {
  color: var(--text-ink-muted);
}

.card__meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold);
}

.card__title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.05rem, 1.6vw, 1.3rem);
  line-height: 1.35;
  letter-spacing: 0.02em;
  color: var(--ivory);
}

.card__text {
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-muted);
}

.card__foot {
  margin-top: auto;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--text-faint);
}

/* 11. 标签
   ========================================================================== */
.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border: 1px solid var(--line-gold);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--champagne);
  background: rgba(201, 162, 39, 0.08);
  white-space: nowrap;
}

.tag--gold {
  border-color: var(--line-gold-strong);
  color: var(--champagne);
  background: rgba(201, 162, 39, 0.14);
}

.tag--amber {
  border-color: rgba(176, 115, 32, 0.55);
  color: #E2B96B;
  background: rgba(176, 115, 32, 0.14);
}

.tag--clay {
  border-color: rgba(160, 90, 60, 0.6);
  color: #DBA184;
  background: rgba(160, 90, 60, 0.16);
}

.tag--moss {
  border-color: rgba(95, 107, 79, 0.7);
  color: #B7C4A2;
  background: rgba(95, 107, 79, 0.18);
}

/* 12. 对照表
   ========================================================================== */
.ledger {
  width: 100%;
  font-size: 15px;
  color: var(--text-muted);
}

.ledger caption {
  caption-side: top;
  text-align: left;
  padding-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold);
}

.ledger th,
.ledger td {
  padding: 13px 14px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line-soft);
}

.ledger th {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold);
  white-space: nowrap;
}

.ledger tbody tr {
  transition: background-color 0.25s var(--ease);
}

.ledger tbody tr:hover {
  background: rgba(201, 162, 39, 0.06);
}

.ledger td:first-child {
  color: var(--ivory);
  font-weight: 500;
}

/* 13. 时间轴
   ========================================================================== */
.timeline {
  position: relative;
  padding-left: 4px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, transparent, var(--line-gold-strong) 12%, var(--line-gold-strong) 88%, transparent);
}

.timeline__item {
  position: relative;
  padding-left: 32px;
  padding-bottom: 30px;
}

.timeline__item:last-child {
  padding-bottom: 0;
}

.timeline__item::before {
  content: "";
  position: absolute;
  left: 1px;
  top: 9px;
  width: 11px;
  height: 11px;
  border: 1px solid var(--gold);
  border-radius: 50%;
  background: var(--obsidian);
  transition: background-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.timeline__item:hover::before {
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(201, 162, 39, 0.16);
}

.timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--gold);
  margin-bottom: 6px;
}

.timeline__title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.1rem;
  line-height: 1.4;
  color: var(--ivory);
  margin-bottom: 6px;
}

.timeline__text {
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-muted);
}

/* 14. 媒体容器（供页面阶段放置图片）
   ========================================================================== */
.media-grid {
  display: grid;
  gap: clamp(12px, 1.6vw, 20px);
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  border: 1px solid var(--line-gold);
  border-radius: var(--radius);
  background:
    linear-gradient(120deg, #141518 0%, #1C1D20 45%, #141518 100%);
  box-shadow: var(--shadow-card);
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    115deg,
    rgba(231, 211, 161, 0.07) 0 1px,
    transparent 1px 14px
  );
  pointer-events: none;
  transition: opacity 0.35s var(--ease);
}

.media-frame:hover {
  border-color: var(--line-gold-strong);
}

.media-frame:hover::after {
  opacity: 0.45;
}

.media-frame img,
.media-frame > picture > img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  position: relative;
  z-index: 1;
}

.media-frame--wide {
  aspect-ratio: 16 / 9;
}

.media-frame--tall {
  aspect-ratio: 3 / 4;
}

.media-frame--square {
  aspect-ratio: 1 / 1;
}

.media-frame__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  padding: 14px 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--champagne);
  background: linear-gradient(180deg, transparent, rgba(10, 10, 11, 0.9));
}

/* 15. 进入视口显现协议
   ========================================================================== */
.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.55s var(--ease), transform 0.55s var(--ease);
}

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

/* 16. 响应式 · 平板与移动
   ========================================================================== */
@media (max-width: 1080px) {
  .grid--split,
  .grid--asym {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 900px) {
  html {
    scroll-padding-top: 88px;
  }

  .site-header {
    padding: 10px 12px 0;
  }

  .nav-shell {
    min-height: 60px;
    padding: 8px 10px 8px 16px;
    border-radius: 22px;
  }

  .site-header[data-scrolled="true"] .nav-shell {
    max-width: 100%;
    min-height: 54px;
  }

  .brand__mark {
    font-size: 14px;
  }

  .brand__sub {
    font-size: 9px;
    letter-spacing: 0.16em;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .primary-nav {
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    right: 0;
    z-index: 5;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    margin-left: 0;
    padding: 14px;
    border: 1px solid var(--line-gold);
    border-radius: 20px;
    background: rgba(14, 14, 16, 0.98);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    box-shadow: 0 34px 60px -34px rgba(0, 0, 0, 0.95);
  }

  .primary-nav[data-open="true"] {
    display: flex;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .nav-link {
    display: block;
    padding: 12px 14px;
    border-radius: 12px;
    font-size: 15px;
  }

  .nav-utility {
    flex-direction: column;
    gap: 8px;
    margin-top: 4px;
    padding-top: 12px;
    border-top: 1px solid var(--line-soft);
  }

  .nav-utility .btn {
    width: 100%;
  }

  .nav-progress {
    left: 12%;
    right: 12%;
  }

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

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 34px;
  }

  .footer-cols {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .ledger {
    font-size: 14px;
  }
}

@media (max-width: 560px) {
  .footer-cols {
    grid-template-columns: minmax(0, 1fr);
    gap: 26px;
  }

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

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

  .timeline__item {
    padding-left: 26px;
  }
}

/* 17. 降低动效偏好
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

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

  .card:hover,
  .btn--gold:hover {
    transform: none;
  }
}