/* ============================================================
   竞博服务中心 · 共享样式 /assets/site.css
   档案库视觉体系：深海墨蓝底 · 品牌金封条 · 电光青检索高亮
   ============================================================ */

:root {
  /* 色板 */
  --ink-900: #071A2B;
  --ink-850: #0A2136;
  --ink-800: #0D2A44;
  --ink-700: #173F5F;
  --gold: #D8A84E;
  --gold-deep: #B98A31;
  --gold-soft: #F0D9A8;
  --cyan: #35E0D0;
  --amber: #E39A3B;
  --steel: #9BB3C8;
  --fog: #EAF1F5;
  --jade: #2FAF9A;

  /* 线性与阴影 */
  --line: rgba(155, 179, 200, 0.22);
  --line-soft: rgba(155, 179, 200, 0.12);
  --line-gold: rgba(216, 168, 78, 0.42);
  --line-cyan: rgba(53, 224, 208, 0.45);
  --shadow: 0 24px 50px -32px rgba(2, 10, 18, 0.95);

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

  /* 尺寸 */
  --shell: 1200px;
  --gutter: clamp(18px, 4vw, 48px);
  --radius-sm: 10px;
  --radius: 16px;
  --radius-lg: 22px;
  --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;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(1100px 620px at 84% -10%, rgba(53, 224, 208, 0.09), transparent 62%),
    radial-gradient(880px 520px at 4% 2%, rgba(216, 168, 78, 0.08), transparent 60%),
    var(--ink-900);
  color: var(--fog);
  font-family: var(--font-body);
  font-size: clamp(16px, 1.05vw, 17px);
  line-height: 1.7;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img { max-width: 100%; height: auto; }
ul, ol, dl, dd, figure { margin: 0; }
button { font: inherit; color: inherit; }

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 0.55em;
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--fog);
}
h1 { font-size: clamp(2.1rem, 5.2vw, 4rem); }
h2 { font-size: clamp(1.7rem, 3.4vw, 2.45rem); }
h3 { font-size: clamp(1.14rem, 2vw, 1.5rem); font-weight: 800; }
h4 { font-size: 1.05rem; font-weight: 800; }

p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

a {
  color: var(--gold-soft);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}
a:hover { color: var(--cyan); }

strong, b { font-weight: 700; color: var(--fog); }

code, kbd, samp {
  font-family: var(--font-mono);
  font-size: 0.92em;
  color: var(--gold-soft);
}

hr {
  border: 0;
  height: 1px;
  background: var(--line);
  margin: 2.4rem 0;
}

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 6px;
}

[data-section],
#main-content { scroll-margin-top: clamp(84px, 12vw, 140px); }

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

.prose { max-width: 72ch; }
.prose p { margin: 0 0 1.1em; }

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

/* ---------- 跳转链接 ---------- */
.skip-link {
  position: fixed;
  left: 16px;
  top: -80px;
  z-index: 300;
  padding: 12px 22px;
  background: var(--cyan);
  color: #04212A;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 14px;
  letter-spacing: 0.06em;
  border-radius: 0 0 12px 12px;
  transition: top 0.22s var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible {
  top: 0;
  color: #04212A;
  outline-offset: -4px;
}

/* ============================================================
   页头 · 刊头结构
   ============================================================ */
.site-header {
  position: relative;
  z-index: 80;
  background: linear-gradient(180deg, #0C2740 0%, #081D2F 58%, #071A2B 100%);
  border-bottom: 1px solid var(--line);
  box-shadow: 0 28px 60px -48px #000;
}

/* 顶部刊号条 */
.header-strip {
  background: rgba(5, 17, 28, 0.55);
  border-bottom: 1px solid var(--line-soft);
}
.header-strip__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  min-height: 38px;
  padding-block: 6px;
}
.header-strip__eyebrow {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 12.5px;
  letter-spacing: 0.26em;
  color: var(--steel);
}
.header-strip__quick {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 22px);
}
.quick-link {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold-soft);
  white-space: nowrap;
}
.quick-link::before {
  content: "◈";
  margin-right: 6px;
  font-size: 10px;
  color: var(--cyan);
}
.quick-link:hover { color: var(--cyan); }

/* 居中报头 */
.masthead {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 16px;
  padding-block: clamp(16px, 2.2vw, 24px) clamp(12px, 1.8vw, 18px);
}
.masthead__mark {
  justify-self: start;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.34em;
  color: var(--steel);
  white-space: nowrap;
}
.masthead__brand {
  grid-column: 2;
  justify-self: center;
  display: grid;
  justify-items: center;
  gap: 9px;
  color: var(--fog);
  text-align: center;
}
.masthead__brand:hover { color: var(--fog); }
.masthead__name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.35rem, 3.2vw, 2.1rem);
  letter-spacing: 0.18em;
  line-height: 1;
  text-indent: 0.18em;
}
.masthead__rule {
  display: block;
  width: clamp(120px, 22vw, 268px);
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--gold) 16%, var(--gold-soft) 50%, var(--gold) 84%, transparent);
}

/* 移动导航按钮 */
.nav-toggle {
  justify-self: end;
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 15px;
  background: rgba(13, 42, 68, 0.75);
  color: var(--gold-soft);
  border: 1px solid var(--line-gold);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  cursor: pointer;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}
.nav-toggle:hover { color: var(--cyan); border-color: var(--line-cyan); }
.nav-toggle__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  transition: background 0.2s var(--ease);
}
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: currentColor;
  transition: transform 0.24s var(--ease);
}
.nav-toggle__bars::before { top: -6px; }
.nav-toggle__bars::after { top: 6px; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { transform: translateY(-6px) rotate(-45deg); }
.nav-toggle__text { line-height: 1; }

/* 主导航 */
.main-nav {
  display: block;
  border-top: 1px solid var(--line-soft);
}
.main-nav__list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: clamp(4px, 2.4vw, 36px);
  margin: 0;
  padding: 0;
  list-style: none;
}
.main-nav__link {
  position: relative;
  display: block;
  padding: 14px 2px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--fog);
  white-space: nowrap;
}
.main-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.24s var(--ease), background 0.24s var(--ease);
}
.main-nav__link:hover { color: var(--gold-soft); }
.main-nav__link:hover::after { transform: scaleX(1); }
.main-nav__link[aria-current="page"] {
  color: var(--cyan);
  font-weight: 800;
}
.main-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
  background: linear-gradient(90deg, var(--cyan), var(--gold));
}

/* 右侧竖排索引签 */
.index-dock {
  position: fixed;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 70;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}
.index-dock__chip {
  writing-mode: vertical-rl;
  padding: 16px 8px;
  border-radius: 999px;
  border: 1px solid var(--line-gold);
  background: rgba(7, 26, 43, 0.88);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  color: var(--gold-soft);
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.3em;
  transition: color 0.22s var(--ease), background 0.22s var(--ease), border-color 0.22s var(--ease);
}
.index-dock__chip:hover,
.index-dock__chip.is-current {
  color: #04212A;
  background: var(--cyan);
  border-color: var(--cyan);
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  position: relative;
  margin-top: clamp(64px, 10vw, 132px);
  background:
    linear-gradient(180deg, rgba(7, 26, 43, 0) 0%, rgba(3, 12, 21, 0.7) 100%),
    linear-gradient(180deg, #0A2136 0%, #061522 100%);
  border-top: 1px solid var(--line-gold);
}
.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--gold) 18%, var(--cyan) 50%, var(--gold) 82%, transparent);
  opacity: 0.85;
}

.footer-lead {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 24px;
  padding-block: clamp(30px, 4.4vw, 48px) 0;
}
.footer-lead__mark {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.34em;
  color: var(--steel);
}
.footer-lead__brand {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(15px, 1.8vw, 18px);
  letter-spacing: 0.06em;
  color: var(--gold-soft);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1.5fr;
  gap: clamp(26px, 4vw, 56px);
  padding-block: clamp(28px, 4.5vw, 52px) clamp(12px, 2vw, 20px);
}

.footer-col { min-width: 0; }
.footer-col__title {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 16px;
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--line);
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.16em;
  color: var(--fog);
}
.footer-col__no {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--gold);
}
.footer-col__list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.footer-link {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-size: 15px;
  color: var(--steel);
}
.footer-link::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  border: 1px solid var(--steel);
  background: transparent;
  transition: background 0.2s var(--ease), border-color 0.2s var(--ease);
}
.footer-link:hover { color: var(--cyan); }
.footer-link:hover::before { background: var(--cyan); border-color: var(--cyan); }

.footer-contact { min-width: 0; }
.footer-contact__list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
}
.footer-contact__row {
  display: grid;
  grid-template-columns: 78px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--line-soft);
}
.footer-contact__row dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--steel);
}
.footer-contact__row dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13.5px;
  color: var(--fog);
  overflow-wrap: anywhere;
}
.footer-contact__note {
  margin: 16px 0 0;
  max-width: 44ch;
  font-size: 12.5px;
  line-height: 1.72;
  color: var(--steel);
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 22px;
  margin-top: clamp(20px, 3vw, 34px);
  padding-block: 18px 28px;
  border-top: 1px solid var(--line-soft);
}
.footer-base__item {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--steel);
}
.footer-base__item--icp { color: var(--gold-soft); }
.footer-base__item--note {
  flex: 1 1 320px;
  font-family: var(--font-body);
  font-size: 12px;
  letter-spacing: 0.01em;
  color: rgba(155, 179, 200, 0.88);
}

/* ============================================================
   返回顶部 · 环形进度
   ============================================================ */
.to-top {
  position: fixed;
  right: 20px;
  bottom: 22px;
  z-index: 90;
  display: grid;
  place-items: center;
  width: 54px;
  height: 54px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: none;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition: opacity 0.26s var(--ease), transform 0.26s var(--ease);
}
.to-top.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: none;
}
.to-top__ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: conic-gradient(var(--cyan) calc(var(--progress, 0) * 1%), rgba(155, 179, 200, 0.22) 0);
  -webkit-mask: radial-gradient(circle, transparent 63%, #000 64%);
  mask: radial-gradient(circle, transparent 63%, #000 64%);
}
.to-top__arrow {
  position: relative;
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(13, 42, 68, 0.92);
  border: 1px solid var(--line-gold);
  color: var(--gold-soft);
  font-size: 15px;
  line-height: 1;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}
.to-top:hover .to-top__arrow {
  color: #04212A;
  background: var(--cyan);
  border-color: var(--cyan);
}

/* ============================================================
   通用组件
   ============================================================ */

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 26px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.2s var(--ease), color 0.2s var(--ease), background 0.2s var(--ease), border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}
.btn--gold {
  background: linear-gradient(135deg, var(--gold), var(--gold-deep));
  color: #08151F;
  box-shadow: 0 16px 34px -22px rgba(216, 168, 78, 0.9);
}
.btn--gold:hover {
  color: #08151F;
  transform: translateY(-2px);
  box-shadow: 0 22px 40px -22px rgba(216, 168, 78, 0.95);
}
.btn--cyan {
  background: var(--cyan);
  color: #04212A;
}
.btn--cyan:hover {
  color: #04212A;
  background: #5CEADD;
  transform: translateY(-2px);
}
.btn--ghost {
  background: transparent;
  border-color: var(--line-gold);
  color: var(--gold-soft);
}
.btn--ghost:hover {
  color: var(--cyan);
  border-color: var(--line-cyan);
  transform: translateY(-2px);
}

/* 面包屑 */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 9px;
  padding-block: 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--steel);
}
.crumbs a { color: var(--steel); }
.crumbs a:hover { color: var(--cyan); }
.crumbs__sep { color: rgba(155, 179, 200, 0.5); }
.crumbs [aria-current="page"] { color: var(--gold-soft); }

/* 章节 */
.section { padding-block: clamp(48px, 7vw, 104px); }
.sec-head {
  display: grid;
  gap: 12px;
  margin-bottom: clamp(24px, 3.2vw, 42px);
}
.sec-no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.32em;
  color: var(--gold);
  text-transform: uppercase;
}
.sec-title { margin: 0; }
.sec-sub {
  margin: 0;
  max-width: 64ch;
  color: var(--steel);
}

/* 主题带 */
.band {
  padding-block: clamp(30px, 4.4vw, 58px);
  border-block: 1px solid var(--line);
}
.band--amber {
  background: linear-gradient(90deg, rgba(227, 154, 59, 0.18), rgba(227, 154, 59, 0.05) 62%, transparent);
  border-block-color: rgba(227, 154, 59, 0.38);
}
.band--steel {
  background: linear-gradient(90deg, rgba(155, 179, 200, 0.16), rgba(155, 179, 200, 0.04) 62%, transparent);
  border-block-color: rgba(155, 179, 200, 0.3);
}
.band--gold {
  background: linear-gradient(90deg, rgba(216, 168, 78, 0.16), rgba(216, 168, 78, 0.04) 62%, transparent);
  border-block-color: rgba(216, 168, 78, 0.36);
}

/* 网格 */
.grid { display: grid; gap: clamp(16px, 2.4vw, 30px); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }

/* 档案卡 */
.archive-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(18px, 2.2vw, 28px);
  background: linear-gradient(160deg, rgba(23, 63, 95, 0.62), rgba(10, 33, 54, 0.92));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: border-color 0.24s var(--ease), transform 0.24s var(--ease);
}
.archive-card::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: linear-gradient(180deg, var(--gold), transparent 72%);
  opacity: 0.75;
}
.archive-card:hover {
  border-color: var(--line-gold);
  transform: translateY(-3px);
}
.archive-card__no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--steel);
}
.archive-card__tag { align-self: flex-start; }
.archive-card__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.14rem;
  font-weight: 800;
  color: var(--fog);
}
.archive-card__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.68;
  color: var(--steel);
}

/* 标签芯片 */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border: 1px solid var(--line-gold);
  border-radius: 999px;
  background: rgba(216, 168, 78, 0.1);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--gold-soft);
  white-space: nowrap;
}
.tag--cyan {
  border-color: var(--line-cyan);
  background: rgba(53, 224, 208, 0.1);
  color: var(--cyan);
}
.tag--steel {
  border-color: var(--line);
  background: rgba(155, 179, 200, 0.1);
  color: var(--steel);
}
.tag--jade {
  border-color: rgba(47, 175, 154, 0.48);
  background: rgba(47, 175, 154, 0.12);
  color: var(--jade);
}

/* 图片容器基座 */
.media {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(140deg, var(--ink-700) 0%, var(--ink-800) 56%, var(--ink-900) 100%);
  isolation: isolate;
}
.media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(90deg, rgba(234, 241, 245, 0.06) 0 1px, transparent 1px 14px);
  pointer-events: none;
}
.media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x3 { aspect-ratio: 4 / 3; }
.media--1x1 { aspect-ratio: 1 / 1; }
.media--3x4 { aspect-ratio: 3 / 4; }
.media--wide { aspect-ratio: 21 / 9; }
.media__label {
  position: absolute;
  left: 12px;
  bottom: 12px;
  z-index: 2;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(7, 26, 43, 0.82);
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--gold-soft);
}

/* 滚动显现 */
[data-reveal] {
  transition: opacity 0.55s var(--ease), transform 0.55s var(--ease);
}
@media (prefers-reduced-motion: no-preference) {
  .reveal-ready [data-reveal]:not(.is-in) {
    opacity: 0;
    transform: translateY(12px);
  }
}

/* ============================================================
   响应式
   ============================================================ */
@media (min-width: 901px) {
  .site-header { position: sticky; top: 0; }
}

@media (max-width: 1200px) {
  .index-dock { display: none; }
}

@media (max-width: 900px) {
  .nav-toggle { display: inline-flex; }

  .masthead {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 12px;
    padding-block: 16px 14px;
  }
  .masthead__mark { display: none; }
  .masthead__brand {
    grid-column: 1;
    justify-self: start;
    justify-items: start;
    text-align: left;
  }
  .masthead__name {
    font-size: clamp(1.2rem, 4.6vw, 1.6rem);
    letter-spacing: 0.1em;
    text-indent: 0.1em;
  }
  .masthead__rule {
    width: 100%;
    max-width: 190px;
  }

  .main-nav { display: none; }
  .main-nav[data-open] { display: block; }
  .main-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 6px 0 14px;
  }
  .main-nav__link {
    padding: 14px 4px 14px 14px;
    border-bottom: 1px solid var(--line-soft);
    font-size: 16px;
  }
  .main-nav__link::after { display: none; }
  .main-nav__link[aria-current="page"]::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 3px;
    height: 18px;
    transform: translateY(-50%);
    border-radius: 2px;
    background: var(--cyan);
  }

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

  .grid--12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
}

@media (max-width: 720px) {
  .grid--2,
  .grid--3 { grid-template-columns: minmax(0, 1fr); }
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .footer-contact { grid-column: auto; }
  .footer-lead { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 560px) {
  .header-strip__inner {
    flex-wrap: wrap;
    justify-content: flex-start;
    gap: 4px 16px;
    padding-block: 8px;
  }
  .header-strip__eyebrow {
    font-size: 10.5px;
    letter-spacing: 0.16em;
  }
  .quick-link { font-size: 11px; letter-spacing: 0.1em; }
  .footer-contact__row { grid-template-columns: 68px minmax(0, 1fr); }
  .footer-base { gap: 6px 14px; }
  .to-top { right: 14px; bottom: 14px; width: 48px; height: 48px; }
  .to-top__arrow { width: 36px; height: 36px; }
}

/* ---------- 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;
  }
  .archive-card:hover,
  .btn:hover,
  .footer-link:hover { transform: none; }
}