/* ============================================================
   卡卡湾电投 · 全站共享样式 /assets/site.css
   蓝图网格 · 悬浮胶囊导航 · 深电蓝页脚 · 近单色层次
   ============================================================ */

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

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

body, h1, h2, h3, h4, h5, p, ul, ol, li, figure, blockquote, dl, dd, address {
  margin: 0;
  padding: 0;
}

ul, ol { list-style: none; }

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

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

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

main { display: block; }

/* ---------- 变量 ---------- */
:root {
  --c-bg: #F2F6FA;
  --c-surface: #FFFFFF;
  --c-deep: #061A2E;
  --c-deep-soft: #0A2440;
  --c-hi: #0B3B6F;
  --c-sel: #1473D4;
  --c-mist: #6FA8DC;
  --c-amber: #F59E0B;
  --c-cyan: #22D3EE;
  --c-line: #C4CFDB;
  --c-ink: #0B1118;
  --c-body: #4A5A6B;
  --c-body-strong: #38495B;
  --c-on-deep: #D6E2EE;
  --c-on-deep-soft: #9FB6CC;

  --font-display: "Barlow Condensed", "Oswald", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", "SFMono-Regular", "Consolas", "Liberation Mono", "Courier New", monospace;
  --font-body: "Noto Sans SC", "Inter", -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;

  --r-pill: 999px;
  --r-lg: 22px;
  --r-md: 14px;
  --r-sm: 10px;

  --shell-max: 1320px;
  --shell-pad: clamp(16px, 4vw, 40px);
  --header-h: 84px;
}

/* ---------- 基础排版 ---------- */
body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--c-ink);
  background-color: var(--c-bg);
  background-image:
    linear-gradient(rgba(111, 168, 220, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(111, 168, 220, 0.07) 1px, transparent 1px);
  background-size: 96px 96px;
  background-position: -1px -1px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  line-height: 1.2;
  text-wrap: balance;
}

p { text-wrap: pretty; }

::selection {
  background: rgba(34, 211, 238, 0.32);
  color: var(--c-deep);
}

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

main [id] { scroll-margin-top: 128px; }

/* ---------- 跳过链接 ---------- */
.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 200;
  padding: 12px 22px;
  border-radius: var(--r-pill);
  background: var(--c-hi);
  color: #FFFFFF;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.04em;
  box-shadow: 0 18px 40px -22px rgba(6, 26, 46, 0.9);
  transform: translateY(-180%);
  transition: transform 0.22s ease;
}

.skip-link:focus {
  transform: translateY(0);
}

/* ---------- 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  padding: 12px var(--shell-pad) 0;
  background: linear-gradient(180deg, rgba(242, 246, 250, 0.96) 0%, rgba(242, 246, 250, 0.82) 100%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  backdrop-filter: blur(16px) saturate(140%);
  border-bottom: 1px solid transparent;
  transition: box-shadow 0.28s ease, border-color 0.28s ease;
}

.site-header[data-stuck="true"] {
  border-bottom-color: rgba(196, 207, 219, 0.75);
  box-shadow: 0 20px 44px -40px rgba(6, 26, 46, 0.85);
}

.header-rail {
  position: relative;
  max-width: var(--shell-max);
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding-bottom: 12px;
}

/* 品牌浮岛 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 8px 22px 8px 9px;
  border-radius: var(--r-pill);
  background: var(--c-surface);
  border: 1px solid rgba(196, 207, 219, 0.9);
  box-shadow: 0 14px 34px -26px rgba(6, 26, 46, 0.85);
  transition: border-color 0.22s ease, box-shadow 0.22s ease;
}

.brand:hover {
  border-color: var(--c-mist);
  box-shadow: 0 18px 40px -26px rgba(11, 59, 111, 0.7);
}

.brand-mark {
  position: relative;
  flex: 0 0 36px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background:
    radial-gradient(circle at 32% 30%, #1B5FA8 0%, var(--c-deep) 72%);
  overflow: hidden;
}

.brand-mark::before {
  content: "";
  position: absolute;
  inset: 0;
  margin: auto;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--c-cyan);
  box-shadow: 0 0 0 4px rgba(34, 211, 238, 0.16), 0 0 14px rgba(34, 211, 238, 0.75);
}

.brand-mark::after {
  content: "";
  position: absolute;
  inset: 5px;
  border-radius: 50%;
  border: 1px solid rgba(34, 211, 238, 0.38);
  border-top-color: rgba(34, 211, 238, 0.95);
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 1px;
  line-height: 1.15;
}

.brand-text__name {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--c-hi);
  white-space: nowrap;
}

.brand-text__tag {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.04em;
  color: var(--c-body);
  white-space: nowrap;
}

/* 导航浮岛 */
.nav-capsule {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 6px;
  border-radius: var(--r-pill);
  background: rgba(255, 255, 255, 0.94);
  border: 1px solid rgba(196, 207, 219, 0.9);
  box-shadow: 0 16px 40px -30px rgba(6, 26, 46, 0.9);
}

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

.nav-list a {
  display: block;
  padding: 9px 15px;
  border-radius: var(--r-pill);
  font-size: 14.5px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: #2A3B4C;
  transition: color 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease;
}

.nav-list a:hover {
  color: var(--c-hi);
  background: rgba(20, 115, 212, 0.08);
}

.nav-list a[aria-current="page"] {
  color: #FFFFFF;
  background: var(--c-hi);
  box-shadow: inset 0 0 0 1px rgba(34, 211, 238, 0.4);
}

.nav-aside {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: 6px;
  padding-left: 10px;
  border-left: 1px solid rgba(196, 207, 219, 0.9);
}

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--c-surface);
  border: 1px solid rgba(196, 207, 219, 0.9);
  box-shadow: 0 14px 34px -26px rgba(6, 26, 46, 0.85);
  transition: border-color 0.2s ease;
}

.nav-toggle:hover { border-color: var(--c-mist); }

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: var(--c-hi);
  transition: background-color 0.22s ease;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: var(--c-hi);
  transition: transform 0.25s 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); }

/* 阅读进度 */
.read-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: rgba(196, 207, 219, 0.5);
  overflow: hidden;
}

.read-progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--c-sel) 0%, var(--c-cyan) 100%);
  box-shadow: 0 0 10px rgba(34, 211, 238, 0.7);
  transition: width 0.12s linear;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--r-pill);
  border: 1px solid transparent;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.03em;
  white-space: nowrap;
  cursor: pointer;
  transition: transform 0.18s ease, background-color 0.2s ease, color 0.2s ease,
              border-color 0.2s ease, box-shadow 0.2s ease;
}

.btn:active { transform: translateY(1px); }

.btn--primary {
  background: var(--c-amber);
  color: #241300;
  box-shadow: 0 14px 28px -18px rgba(245, 158, 11, 0.95);
}

.btn--primary:hover {
  background: #FFB020;
  box-shadow: 0 18px 34px -18px rgba(245, 158, 11, 1);
}

.btn--ghost {
  background: rgba(20, 115, 212, 0.08);
  color: var(--c-hi);
  border-color: rgba(20, 115, 212, 0.24);
}

.btn--ghost:hover {
  background: rgba(20, 115, 212, 0.14);
  border-color: var(--c-sel);
}

.btn--line {
  background: transparent;
  color: var(--c-deep);
  border-color: rgba(196, 207, 219, 0.95);
}

.btn--line:hover {
  border-color: var(--c-hi);
  color: var(--c-hi);
}

/* ---------- 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(56px, 8vw, 120px);
  background: var(--c-deep);
  color: var(--c-on-deep);
  overflow: hidden;
  border-top-left-radius: 38px;
  border-top-right-radius: 38px;
  box-shadow: 0 -30px 70px -60px rgba(6, 26, 46, 0.9);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 6%;
  right: 6%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(34, 211, 238, 0.55), transparent);
}

.footer-grid {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(111, 168, 220, 0.13) 1px, transparent 1px),
    linear-gradient(90deg, rgba(111, 168, 220, 0.13) 1px, transparent 1px);
  background-size: 76px 76px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.95), rgba(0, 0, 0, 0.12));
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.95), rgba(0, 0, 0, 0.12));
}

.footer-shell {
  position: relative;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: clamp(42px, 6vw, 76px) var(--shell-pad) 26px;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.35fr 0.85fr 0.85fr 1.5fr;
  gap: clamp(26px, 4vw, 56px);
}

.footer-brand__name {
  font-family: var(--font-display);
  font-size: clamp(24px, 2.8vw, 32px);
  font-weight: 700;
  letter-spacing: 0.12em;
  color: #FFFFFF;
}

.footer-brand__line {
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-on-deep-soft);
  letter-spacing: 0.02em;
}

.footer-brand__meta {
  margin-top: 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-cyan);
}

.footer-nav__title {
  padding-bottom: 12px;
  margin-bottom: 16px;
  border-bottom: 1px solid rgba(111, 168, 220, 0.26);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--c-mist);
}

.footer-nav__list {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.footer-nav__list a {
  display: inline-block;
  font-size: 14px;
  color: #C0D3E4;
  transition: color 0.2s ease, transform 0.2s ease;
}

.footer-nav__list a:hover {
  color: var(--c-cyan);
  transform: translateX(3px);
}

.footer-nav__list a[aria-current="page"] {
  color: var(--c-cyan);
}

.footer-contact { font-style: normal; }

.footer-contact__list {
  display: flex;
  flex-direction: column;
  gap: 13px;
}

.footer-contact__list li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  font-size: 14px;
  line-height: 1.65;
}

.footer-key {
  flex: 0 0 46px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--c-mist);
  padding-top: 2px;
}

.footer-val { color: var(--c-on-deep); }

.footer-note {
  margin-top: 24px;
  padding: 14px 16px;
  border-radius: var(--r-md);
  border: 1px dashed rgba(111, 168, 220, 0.36);
  background: rgba(111, 168, 220, 0.08);
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-on-deep-soft);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 28px;
  margin-top: clamp(30px, 4vw, 52px);
  padding-top: 22px;
  border-top: 1px solid rgba(111, 168, 220, 0.24);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: #7E96AD;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
}

.footer-legal a {
  color: #9FB6CC;
  transition: color 0.2s ease;
}

.footer-legal a:hover { color: var(--c-cyan); }

.footer-icp { color: #9FB6CC; }

.footer-data { color: #6E8499; }

/* ---------- 通用布局组件 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--shell-pad);
}

.section { padding-block: clamp(48px, 7vw, 96px); }
.section--tight { padding-block: clamp(28px, 4vw, 52px); }

.rule {
  height: 1px;
  border: 0;
  background: linear-gradient(90deg, rgba(196, 207, 219, 0.95), rgba(111, 168, 220, 0.24), transparent);
}

/* ---------- 文字组件 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.24em;
  color: var(--c-sel);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: currentColor;
  opacity: 0.75;
}

.coord {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--c-mist);
}

.index-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(46px, 8vw, 104px);
  font-weight: 600;
  line-height: 0.86;
  letter-spacing: -0.03em;
  color: rgba(11, 59, 111, 0.12);
}

@supports (-webkit-text-stroke: 1px #000) {
  .index-num {
    color: transparent;
    -webkit-text-stroke: 1.2px rgba(11, 59, 111, 0.34);
  }
}

.h-display {
  font-family: var(--font-display);
  font-size: clamp(34px, 5.4vw, 64px);
  font-weight: 700;
  letter-spacing: 0.07em;
  line-height: 1.08;
  color: var(--c-hi);
}

.h-section {
  font-family: var(--font-display);
  font-size: clamp(24px, 3.4vw, 38px);
  font-weight: 700;
  letter-spacing: 0.07em;
  line-height: 1.16;
  color: var(--c-hi);
}

.h-card {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--c-deep);
}

.p-lead {
  font-size: clamp(15px, 1.5vw, 18px);
  line-height: 1.78;
  color: var(--c-body-strong);
}

.p-body {
  font-size: 15px;
  line-height: 1.78;
  color: var(--c-body);
}

.mono {
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
  padding-block: 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-body);
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 10px;
}

.breadcrumb li + li::before {
  content: "/";
  color: var(--c-line);
}

.breadcrumb a { color: var(--c-sel); }
.breadcrumb a:hover { color: var(--c-hi); }
.breadcrumb [aria-current="page"] { color: var(--c-ink); }

/* ---------- 网格与卡片 ---------- */
.grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 28px);
}

.grid--2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(258px, 1fr)); }
.grid--4 { grid-template-columns: repeat(auto-fit, minmax(216px, 1fr)); }

.card {
  position: relative;
  padding: clamp(20px, 2.4vw, 28px);
  background: var(--c-surface);
  border: 1px solid rgba(196, 207, 219, 0.85);
  border-radius: var(--r-lg);
  transition: border-color 0.22s ease, transform 0.22s ease, box-shadow 0.22s ease;
}

.card:hover {
  border-color: var(--c-mist);
  transform: translateY(-2px);
  box-shadow: 0 26px 52px -38px rgba(6, 26, 46, 0.7);
}

/* ---------- 统计锚点 ---------- */
.stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 20px;
  background: var(--c-surface);
  border: 1px solid rgba(196, 207, 219, 0.85);
  border-radius: var(--r-md);
}

.stat__value {
  font-family: var(--font-mono);
  font-size: clamp(22px, 2.6vw, 34px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--c-hi);
}

.stat__label {
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--c-body);
}

/* ---------- 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: var(--r-pill);
  border: 1px solid rgba(20, 115, 212, 0.2);
  background: rgba(20, 115, 212, 0.09);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--c-hi);
}

.tag--amber {
  background: rgba(245, 158, 11, 0.12);
  border-color: rgba(245, 158, 11, 0.36);
  color: #8A5600;
}

.tag--cyan {
  background: rgba(34, 211, 238, 0.12);
  border-color: rgba(34, 211, 238, 0.38);
  color: #0E6E80;
}

/* ---------- 图片容器基础规则 ---------- */
.media {
  position: relative;
  overflow: hidden;
  display: block;
  border-radius: var(--r-lg);
  border: 1px solid rgba(196, 207, 219, 0.85);
  background: linear-gradient(140deg, #0A2440 0%, #061A2E 100%);
}

.media > img,
.media > video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x3 { aspect-ratio: 4 / 3; }
.media--1x1 { aspect-ratio: 1 / 1; }
.media--tall { aspect-ratio: 3 / 4; }

.media--placeholder {
  display: grid;
  place-items: center;
  min-height: 180px;
  color: rgba(111, 168, 220, 0.7);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  text-align: center;
  padding: 24px;
}

.media--placeholder::after {
  content: "";
  position: absolute;
  inset: 14px;
  border: 1px dashed rgba(111, 168, 220, 0.36);
  border-radius: var(--r-md);
  pointer-events: none;
}

.media__tag {
  position: absolute;
  top: 14px;
  left: 14px;
  z-index: 2;
  padding: 6px 12px;
  border-radius: var(--r-pill);
  background: rgba(6, 26, 46, 0.76);
  border: 1px solid rgba(34, 211, 238, 0.42);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--c-cyan);
}

.media__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  padding: 38px 18px 16px;
  background: linear-gradient(180deg, rgba(6, 26, 46, 0) 0%, rgba(6, 26, 46, 0.88) 100%);
  font-size: 13.5px;
  line-height: 1.6;
  color: #E3EEF8;
}

/* ---------- 滚动显现 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.6s ease, transform 0.6s cubic-bezier(0.2, 0.7, 0.3, 1);
}

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

/* ---------- 页面内索引链接状态（配合 JS） ---------- */
[data-index-link] {
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

[data-index-link][data-current="true"] {
  color: var(--c-hi);
  border-color: var(--c-cyan);
}

/* ---------- 平滑滚动 ---------- */
@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

/* ---------- 响应式：平板与手机 ---------- */
@media (max-width: 1360px) {
  .brand-text__tag { display: none; }
}

@media (max-width: 1120px) {
  .nav-toggle { display: grid; }

  .nav-capsule {
    position: absolute;
    top: calc(100% + 12px);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    padding: 14px;
    border-radius: var(--r-lg);
    background: var(--c-surface);
    box-shadow: 0 34px 70px -40px rgba(6, 26, 46, 0.85);
    max-height: calc(100vh - 160px);
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity 0.22s ease, transform 0.22s ease, visibility 0.22s ease;
  }

  .nav-capsule[data-open="true"] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
  }

  .nav-list a {
    padding: 13px 16px;
    font-size: 15px;
    border-radius: var(--r-md);
  }

  .nav-aside {
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
    margin-left: 0;
    padding-left: 0;
    padding-top: 12px;
    border-left: 0;
    border-top: 1px solid rgba(196, 207, 219, 0.9);
  }

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

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

  .footer-brand,
  .footer-contact {
    grid-column: span 2;
  }
}

@media (max-width: 720px) {
  body { font-size: 15.5px; }

  .site-footer {
    border-top-left-radius: 26px;
    border-top-right-radius: 26px;
  }

  .footer-top {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
  }

  .footer-brand,
  .footer-contact {
    grid-column: span 1;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .footer-contact__list li {
    flex-direction: column;
    gap: 3px;
  }

  .footer-key { flex: none; }
}

@media (max-width: 480px) {
  .brand { padding: 7px 16px 7px 8px; gap: 10px; }
  .brand-mark { flex-basis: 30px; width: 30px; height: 30px; }
  .brand-text__name { font-size: 17px; letter-spacing: 0.1em; }
  .nav-toggle { width: 44px; height: 44px; }
}

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

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

  .read-progress__bar { transition: none; }
}