/* ==========================================================================
   云开看台 · /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 头部 / 页脚 / 按钮 / 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;
}

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

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

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

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

button {
  background: none;
  border: 0;
  cursor: pointer;
}

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

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

/* ---------- 2. 变量 ---------- */
:root {
  --ink: #0B1B33;
  --ink-2: #12294A;
  --ink-3: #08152A;
  --night: #050B14;
  --cloud: #C9D3DF;
  --mist: #EEF2F6;
  --paper: #F5F8FC;
  --orange: #FF6A2A;
  --teal: #35D6C8;
  --amber: #FFB547;
  --line: #1F4068;
  --line-soft: rgba(31, 64, 104, 0.55);
  --grass: #7FA6A0;

  --rail: 220px;

  --font-display: "Barlow Condensed", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --dur: 280ms;
  --shadow-hard: 8px 8px 0 0 rgba(5, 11, 20, 0.85);
  --shadow-soft: 5px 5px 0 0 rgba(5, 11, 20, 0.85);
}

/* ---------- 3. 基础与中文排版 ---------- */
body {
  min-height: 100vh;
  background-color: var(--ink);
  color: var(--text, #F5F8FC);
  color: #F5F8FC;
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.7;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(58% 46% at 88% 6%, rgba(53, 214, 200, 0.10), transparent 70%),
    radial-gradient(52% 42% at 6% 92%, rgba(255, 106, 42, 0.09), transparent 72%),
    radial-gradient(70% 60% at 50% 40%, rgba(18, 41, 74, 0.55), transparent 78%);
}

body.is-nav-open {
  overflow: hidden;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.08;
  letter-spacing: -0.015em;
  color: #F5F8FC;
}

h1 { font-size: clamp(44px, 6.4vw, 96px); font-weight: 300; }
h2 { font-size: clamp(30px, 3.6vw, 48px); font-weight: 300; }
h3 { font-size: clamp(21px, 2vw, 28px); font-weight: 400; }
h4 { font-size: clamp(17px, 1.5vw, 20px); font-weight: 500; letter-spacing: 0.02em; }

p {
  text-wrap: pretty;
}

strong {
  font-weight: 600;
  color: #F5F8FC;
}

small {
  font-size: 12px;
  line-height: 1.6;
}

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

::selection {
  background: var(--orange);
  color: var(--ink);
}

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

a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 3px;
}

#main-content {
  scroll-margin-top: 84px;
}

/* ---------- 4. 布局辅助 ---------- */
.container {
  width: 100%;
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: clamp(18px, 4vw, 56px);
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(14px, 1.8vw, 26px);
}

.section-head {
  display: grid;
  gap: 10px;
  max-width: 62ch;
}

.eyebrow {
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--teal);
}

.rule {
  height: 2px;
  border: 0;
  background: var(--line);
  margin-block: clamp(24px, 3vw, 40px);
}

.surface-light {
  background: var(--mist);
  color: var(--ink);
  border: 2px solid var(--ink);
  box-shadow: var(--shadow-hard);
}

.surface-light h2,
.surface-light h3,
.surface-light h4,
.surface-light strong {
  color: var(--ink);
}

/* ---------- 5. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 11px 18px;
  border: 2px solid var(--line);
  background: transparent;
  color: #F5F8FC;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.1em;
  line-height: 1.2;
  text-align: center;
  cursor: pointer;
  transition:
    transform var(--dur) var(--ease),
    background-color var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    color var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}

.btn:hover {
  transform: translate(-2px, -2px);
}

.btn:active {
  transform: translate(0, 0);
}

.btn--primary {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--ink);
  box-shadow: var(--shadow-soft);
}

.btn--primary:hover {
  background: var(--amber);
  border-color: var(--amber);
  box-shadow: 7px 7px 0 0 rgba(5, 11, 20, 0.9);
}

.btn--ghost {
  background: transparent;
  border-color: var(--line);
  color: #F5F8FC;
}

.btn--ghost:hover {
  border-color: var(--teal);
  color: var(--teal);
}

.btn--quiet {
  border-color: transparent;
  color: var(--cloud);
  padding-inline: 4px;
  letter-spacing: 0.08em;
}

.btn--quiet:hover {
  color: var(--orange);
  transform: none;
}

/* ---------- 6. 品牌标识 ---------- */
.brandmark {
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  width: 42px;
  height: 42px;
  background: var(--orange);
  color: var(--ink);
  border: 2px solid var(--night);
  box-shadow: 4px 4px 0 0 var(--night);
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  line-height: 1;
}

.brandmark--sm {
  width: 34px;
  height: 34px;
  font-size: 16px;
  box-shadow: 3px 3px 0 0 var(--night);
}

/* ---------- 7. 头部（移动端优先：sticky 顶栏 + 抽屉） ---------- */
.skip-link {
  position: fixed;
  top: -110px;
  left: 12px;
  z-index: 300;
  display: inline-block;
  padding: 10px 16px;
  background: var(--amber);
  color: var(--ink);
  border: 2px solid var(--night);
  font-family: var(--font-display);
  font-size: 14px;
  letter-spacing: 0.1em;
  transition: top 200ms var(--ease);
}

.skip-link:focus {
  top: 12px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: var(--ink);
  border-bottom: 2px solid var(--line);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px clamp(14px, 4vw, 24px);
}

.topbar__brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.topbar__text {
  display: flex;
  flex-direction: column;
  gap: 1px;
  min-width: 0;
}

.topbar__name {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: #F5F8FC;
  line-height: 1.2;
}

.topbar__sub {
  font-size: 9px;
  letter-spacing: 0.14em;
  color: var(--cloud);
  line-height: 1.3;
  white-space: nowrap;
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-height: 44px;
  padding: 8px 12px;
  border: 2px solid var(--line);
  color: #F5F8FC;
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.16em;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

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

.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 18px;
  height: 14px;
}

.nav-toggle__bars span {
  display: block;
  height: 2px;
  background: var(--orange);
  transition: transform 300ms var(--ease), opacity 200ms var(--ease);
}

.site-header[data-open] .nav-toggle__bars span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.site-header[data-open] .nav-toggle__bars span:nth-child(2) {
  opacity: 0;
}

.site-header[data-open] .nav-toggle__bars span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: 92;
  background: rgba(5, 11, 20, 0.72);
  opacity: 0;
  pointer-events: none;
  transition: opacity 300ms var(--ease);
}

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

.rail {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  z-index: 95;
  display: flex;
  flex-direction: column;
  gap: 16px;
  width: min(88vw, 348px);
  padding: 20px 18px 28px;
  overflow-y: auto;
  background: linear-gradient(180deg, #0B1B33 0%, #071528 56%, #050B14 100%);
  border-left: 2px solid var(--line);
  transform: translateX(103%);
  transition: transform 420ms var(--ease);
  -webkit-overflow-scrolling: touch;
}

.rail::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.028) 0 1px,
    transparent 1px 76px
  );
}

.site-header[data-open] .rail {
  transform: translateX(0);
}

.rail__brand {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--line);
}

.rail__brandtext {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.rail__brandline {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: #F5F8FC;
  line-height: 1.2;
}

.rail__brandsub {
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--cloud);
  line-height: 1.4;
}

.rail__nav {
  position: relative;
}

.rail__list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.rail__item {
  position: relative;
}

.rail__link {
  position: relative;
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 9px 8px 9px 14px;
  border: 1px solid transparent;
  color: var(--cloud);
  transition:
    color var(--dur) var(--ease),
    background-color var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}

.rail__link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  bottom: 7px;
  width: 3px;
  background: var(--orange);
  transform: scaleY(0);
  transform-origin: top center;
  transition: transform 240ms var(--ease);
}

.rail__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--grass);
  font-variant-numeric: tabular-nums;
  transition: color var(--dur) var(--ease);
}

.rail__label {
  font-size: 14px;
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.rail__link:hover {
  color: #F5F8FC;
  background: rgba(53, 214, 200, 0.08);
  border-color: var(--line);
  transform: translateX(2px);
}

.rail__link:hover .rail__num {
  color: var(--teal);
}

.rail__link[aria-current="page"] {
  color: #F5F8FC;
  border-color: rgba(255, 106, 42, 0.55);
  background: linear-gradient(90deg, rgba(255, 106, 42, 0.18), rgba(255, 106, 42, 0) 72%);
}

.rail__link[aria-current="page"]::before {
  transform: scaleY(1);
}

.rail__link[aria-current="page"] .rail__num {
  color: var(--orange);
}

.rail__tail {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: auto;
  padding-top: 16px;
  border-top: 2px solid var(--line);
}

.rail__strip {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 2px;
}

.rail__strip li {
  padding: 3px 7px;
  border: 1px solid var(--line);
  font-size: 10px;
  line-height: 1.5;
  letter-spacing: 0.1em;
  color: var(--grass);
}

.rail .btn {
  width: 100%;
}

.rail__progress {
  display: none;
}

.rail__progress span {
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(180deg, var(--orange), var(--teal));
  transform: scaleY(0);
  transform-origin: top center;
  transition: transform 120ms linear;
}

/* ---------- 8. 头部桌面端：左侧固定看台轨道 ---------- */
@media (min-width: 900px) {
  body {
    padding-left: var(--rail);
  }

  .site-header {
    position: fixed;
    inset: 0 auto 0 0;
    width: var(--rail);
    border-bottom: 0;
    border-right: 2px solid var(--line);
    background: linear-gradient(180deg, #0B1B33 0%, #071528 58%, #050B14 100%);
  }

  .topbar {
    display: none;
  }

  .nav-scrim {
    display: none;
  }

  .rail {
    position: relative;
    inset: auto;
    width: auto;
    height: 100%;
    z-index: auto;
    border-left: 0;
    transform: none;
    transition: none;
    padding: 24px 16px 22px;
  }

  .rail__progress {
    display: block;
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    width: 3px;
    background: rgba(31, 64, 104, 0.45);
  }
}

@media (max-width: 400px) {
  .topbar__sub {
    display: none;
  }
}

/* ---------- 9. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 7vw, 96px);
  background: linear-gradient(180deg, #071528 0%, #050B14 100%);
  border-top: 2px solid var(--line);
  color: var(--cloud);
}

.footer__stairs {
  display: flex;
  align-items: flex-end;
  gap: 2px;
  height: 56px;
  padding-inline: clamp(16px, 4vw, 56px);
  border-bottom: 2px solid var(--line-soft);
  background: linear-gradient(180deg, rgba(11, 27, 51, 0), rgba(11, 27, 51, 0.85));
}

.footer__stairs span {
  flex: 1 1 0;
  height: 14px;
  background: linear-gradient(180deg, rgba(255, 106, 42, 0.55), rgba(255, 106, 42, 0));
}

.footer__stairs span:nth-child(2) {
  height: 20px;
  background: linear-gradient(180deg, rgba(53, 214, 200, 0.5), rgba(53, 214, 200, 0));
}

.footer__stairs span:nth-child(3) {
  height: 26px;
}

.footer__stairs span:nth-child(4) {
  height: 32px;
  background: linear-gradient(180deg, rgba(53, 214, 200, 0.55), rgba(53, 214, 200, 0));
}

.footer__stairs span:nth-child(5) {
  height: 40px;
}

.footer__stairs span:nth-child(6) {
  height: 48px;
  background: linear-gradient(180deg, rgba(53, 214, 200, 0.62), rgba(53, 214, 200, 0));
}

.footer__inner {
  max-width: 1200px;
  margin-inline: auto;
  padding: clamp(34px, 4.5vw, 64px) clamp(16px, 4vw, 56px) clamp(26px, 3vw, 40px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 3.4vw, 52px);
}

.footer__brandlink {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.footer__brandname {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: #F5F8FC;
}

.footer__summary {
  max-width: 44ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--cloud);
}

.footer__update {
  margin-top: 12px;
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.03em;
  color: var(--grass);
}

.footer__cols {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px 18px;
}

.footer__coltitle {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--grass);
}

.footer__coltitle::after {
  content: "";
  flex: 1 1 auto;
  height: 1px;
  background: var(--line-soft);
}

.footer__list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.footer__list a {
  display: inline-block;
  padding: 5px 0;
  font-size: 14px;
  color: var(--cloud);
  border-bottom: 1px solid transparent;
  transition:
    color var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}

.footer__list a:hover {
  color: var(--orange);
  border-color: var(--orange);
  transform: translateX(3px);
}

.footer__facts {
  display: grid;
  gap: 14px;
}

.footer__fact dt {
  margin-bottom: 3px;
  font-family: var(--font-display);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--grass);
}

.footer__fact dd {
  font-size: 13.5px;
  line-height: 1.65;
  color: #F5F8FC;
}

.footer__mono {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.01em;
  word-break: break-all;
  font-variant-numeric: tabular-nums;
}

.footer__note {
  margin-top: 14px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--grass);
}

.footer__cta {
  margin-top: 16px;
}

.footer__legal {
  border-top: 2px solid var(--line);
}

.footer__legalinner {
  max-width: 1200px;
  margin-inline: auto;
  padding: 16px clamp(16px, 4vw, 56px) 26px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  font-size: 12px;
  color: var(--grass);
}

.footer__copy {
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
  font-variant-numeric: tabular-nums;
}

.footer__legallist {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 18px;
}

.footer__legallist a {
  transition: color var(--dur) var(--ease);
}

.footer__legallist a:hover {
  color: var(--teal);
}

.footer__icp {
  padding: 2px 8px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--cloud);
  letter-spacing: 0.02em;
}

@media (min-width: 720px) {
  .footer__inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer__brand {
    grid-column: 1 / -1;
  }
}

@media (min-width: 1024px) {
  .footer__inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1.5fr) minmax(0, 0.95fr);
  }

  .footer__brand {
    grid-column: auto;
  }

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

/* ---------- 10. 标签 / 卡片 / 数据 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border: 1px solid var(--line);
  background: rgba(18, 41, 74, 0.65);
  font-family: var(--font-display);
  font-size: 11px;
  letter-spacing: 0.14em;
  line-height: 1.6;
  color: var(--cloud);
}

.tag--orange {
  border-color: rgba(255, 106, 42, 0.6);
  color: var(--amber);
}

.tag--teal {
  border-color: rgba(53, 214, 200, 0.5);
  color: var(--teal);
}

.card {
  position: relative;
  padding: clamp(18px, 2.4vw, 28px);
  border: 2px solid var(--line);
  background: linear-gradient(180deg, rgba(18, 41, 74, 0.92), rgba(8, 21, 42, 0.94));
  box-shadow: var(--shadow-hard);
}

.card--flat {
  box-shadow: none;
}

.card--light {
  background: var(--mist);
  border-color: var(--ink);
  color: var(--ink);
}

.card--light h2,
.card--light h3,
.card--light h4,
.card--light strong {
  color: var(--ink);
}

.metric {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.metric__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(40px, 7vw, 96px);
  font-weight: 400;
  line-height: 0.95;
  letter-spacing: -0.03em;
  color: var(--teal);
}

.metric__label {
  font-family: var(--font-display);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--grass);
}

.table {
  width: 100%;
  font-size: 14px;
}

.table caption {
  padding-bottom: 10px;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--grass);
  text-align: left;
}

.table th {
  padding: 10px 12px;
  border-bottom: 2px solid var(--line);
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--grass);
  text-align: left;
}

.table td {
  padding: 12px;
  border-bottom: 1px solid var(--line-soft);
  color: var(--cloud);
  vertical-align: top;
}

.table .num,
.table td.num,
.table th.num {
  text-align: right;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.table tbody tr:hover td {
  background: rgba(53, 214, 200, 0.06);
}

/* ---------- 11. 图片容器（页面阶段放置图片） ---------- */
.media {
  position: relative;
  overflow: hidden;
  border: 2px solid var(--line);
  box-shadow: var(--shadow-hard);
  background:
    radial-gradient(120% 90% at 18% 0%, rgba(53, 214, 200, 0.18), transparent 62%),
    radial-gradient(95% 80% at 92% 100%, rgba(255, 106, 42, 0.22), transparent 58%),
    repeating-linear-gradient(135deg, rgba(245, 248, 252, 0.045) 0 2px, transparent 2px 13px),
    linear-gradient(180deg, #12294A, #08152A);
}

.media img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media__caption {
  position: absolute;
  z-index: 2;
  left: 0;
  bottom: 0;
  right: 0;
  margin: 0;
  padding: 10px 12px;
  background: linear-gradient(180deg, rgba(5, 11, 20, 0), rgba(5, 11, 20, 0.92));
  font-family: var(--font-display);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cloud);
}

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

/* ---------- 12. 正文与面包屑 ---------- */
.prose {
  max-width: 68ch;
  font-size: 17px;
  line-height: 1.75;
  color: var(--cloud);
}

.prose > * + * {
  margin-top: 1em;
}

.prose h2,
.prose h3 {
  margin-top: 1.6em;
  color: #F5F8FC;
}

.prose a {
  color: var(--teal);
  border-bottom: 1px solid rgba(53, 214, 200, 0.5);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.prose a:hover {
  color: var(--amber);
  border-color: var(--amber);
}

.prose ul,
.prose ol {
  padding-left: 1.2em;
  list-style: disc;
}

.prose ol {
  list-style: decimal;
}

.prose blockquote {
  padding: 12px 0 12px 18px;
  border-left: 3px solid var(--orange);
  color: #F5F8FC;
}

.breadcrumb {
  font-family: var(--font-display);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--grass);
}

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

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

.breadcrumb li:not(:first-child)::before {
  content: "/";
  color: var(--line);
}

.breadcrumb a {
  transition: color var(--dur) var(--ease);
}

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

.breadcrumb [aria-current="page"] {
  color: #F5F8FC;
}

/* ---------- 13. 动效 ---------- */
[data-reveal] {
  transition:
    opacity 420ms var(--ease),
    transform 420ms var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
}

[data-reveal="pending"] {
  opacity: 0;
  transform: translateY(16px);
}

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

/* ---------- 14. 减少动态 ---------- */
@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;
    scroll-behavior: auto !important;
  }

  [data-reveal],
  [data-reveal="pending"] {
    opacity: 1 !important;
    transform: none !important;
  }

  .rail {
    transition: none;
  }
}