/* ==========================================================================
   金宝博品牌 · 城市坐标站点
   共享样式表 /assets/site.css
   01 变量  02 重置  03 中文排版  04 布局容器  05 基础组件
   06 头部与导航  07 页脚  08 媒体容器  09 响应式  10 动效偏好
   ========================================================================== */

/* 01 变量 ---------------------------------------------------------------- */
:root {
  --c-deep: #061A2E;
  --c-night: #0C2C4A;
  --c-cyan: #35F2E0;
  --c-amber: #FFC24B;
  --c-orange: #FF7A3D;
  --c-mist: #A8BFD4;
  --c-paper: #F4F8FC;
  --c-grid: #1B3B5C;
  --c-glitch: #8A5BFF;
  --c-amber-deep: #8A5A00;

  --bg: var(--c-deep);
  --bg-panel: var(--c-night);
  --ink: var(--c-paper);
  --ink-2: var(--c-mist);
  --ink-3: rgba(168, 191, 212, 0.7);
  --line: rgba(53, 242, 224, 0.22);
  --line-2: rgba(27, 59, 92, 0.95);
  --line-3: rgba(168, 191, 212, 0.16);

  --font-display: "HarmonyOS Sans SC", "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-body: system-ui, -apple-system, "Segoe UI", "HarmonyOS Sans SC", "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "JetBrains Mono", "Cascadia Mono", Consolas, "Source Han Sans SC", monospace;

  --shell: 1280px;
  --gutter: clamp(18px, 4vw, 48px);
  --header-h: 74px;
  --radius: 3px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --t-fast: 180ms;
  --t-mid: 260ms;
  --t-slow: 320ms;
  --shadow-panel: 0 20px 48px -30px rgba(0, 0, 0, 0.9);
}

/* 02 重置 ---------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
html.nav-open { overflow: hidden; }
body, h1, h2, h3, h4, h5, p, ul, ol, li, figure, blockquote, dl, dd, figure { margin: 0; }
ul, ol { padding: 0; list-style: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
img, svg, video { display: block; max-width: 100%; }
table { border-collapse: collapse; width: 100%; }
:focus-visible { outline: 2px solid var(--c-cyan); outline-offset: 2px; border-radius: 2px; }

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--c-deep);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.8;
  letter-spacing: 0.01em;
  overflow-x: hidden;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(27, 59, 92, 0.55) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(27, 59, 92, 0.55) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: 0.55;
}
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(900px 520px at 6% -8%, rgba(53, 242, 224, 0.11), transparent 64%),
    radial-gradient(760px 460px at 94% 2%, rgba(138, 91, 255, 0.13), transparent 66%),
    radial-gradient(1200px 760px at 50% 118%, rgba(255, 122, 61, 0.08), transparent 70%);
}
main, .site-header, .site-footer { position: relative; z-index: 1; }
main { display: block; }
#main-content { scroll-margin-top: calc(var(--header-h) + 14px); }

/* 03 中文排版 ------------------------------------------------------------ */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: 0.04em;
  line-height: 1.18;
  color: var(--ink);
}
h1 { font-size: clamp(2rem, 4.6vw, 3.4rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.3rem); }
h3 { font-size: clamp(1.15rem, 2vw, 1.45rem); }
h4 { font-size: 1.05rem; }
p { overflow-wrap: break-word; }
strong { color: var(--ink); font-weight: 700; }
code, kbd, samp, .mono { font-family: var(--font-mono); font-size: 0.92em; letter-spacing: 0.06em; }

/* 04 布局容器 ------------------------------------------------------------ */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.section { position: relative; padding-block: clamp(52px, 7vw, 104px); }
.section--tight { padding-block: clamp(32px, 4vw, 58px); }
.section--deep {
  background: linear-gradient(180deg, rgba(12, 44, 74, 0.62), rgba(6, 26, 46, 0));
  border-block: 1px solid var(--line-3);
}
.section__label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--c-cyan);
}
.section__label::before {
  content: "";
  width: 24px;
  height: 1px;
  background: linear-gradient(90deg, var(--c-cyan), transparent);
}
.section__title { letter-spacing: 0.03em; }
.section__lead { margin-top: 14px; max-width: 64ch; color: var(--ink-2); font-size: 16.5px; }
.lede { max-width: 70ch; font-size: clamp(1rem, 1.4vw, 1.14rem); line-height: 1.85; color: var(--ink-2); }

.coord-rule {
  display: block;
  height: 26px;
  margin-block: clamp(28px, 4vw, 52px);
  border-bottom: 1px solid var(--line-2);
  background-image: repeating-linear-gradient(90deg, rgba(168, 191, 212, 0.3) 0 1px, transparent 1px 40px);
  background-repeat: repeat-x;
  background-position: 0 100%;
  background-size: 40px 9px;
}

.grid { display: grid; gap: clamp(18px, 2.4vw, 32px); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--aside { grid-template-columns: minmax(0, 1fr) 288px; align-items: start; }

/* 05 基础组件 ------------------------------------------------------------ */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 22px;
  border: 1px solid var(--line-2);
  border-radius: var(--radius);
  background: rgba(12, 44, 74, 0.62);
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.1em;
  line-height: 1.2;
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease),
              border-color var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
}
.btn::before {
  content: "";
  width: 6px;
  height: 6px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.75;
  transition: transform var(--t-fast) var(--ease), opacity var(--t-fast) var(--ease);
}
.btn:hover { border-color: var(--c-cyan); color: var(--c-cyan); transform: translateY(-2px); }
.btn:hover::before { opacity: 1; transform: scale(1.25); }
.btn:active { transform: translateY(0); }
.btn:active::before { animation: node-ping 420ms var(--ease); }
.btn--primary { background: var(--c-orange); border-color: var(--c-orange); color: #200A00; }
.btn--primary:hover { background: var(--c-amber); border-color: var(--c-amber); color: #200A00; }
.btn--ghost { background: transparent; }
.btn--ghost:hover { background: rgba(53, 242, 224, 0.08); }

@keyframes node-ping {
  0% { box-shadow: 0 0 0 0 rgba(53, 242, 224, 0.55); }
  100% { box-shadow: 0 0 0 12px rgba(53, 242, 224, 0); }
}

.link-route {
  position: relative;
  display: inline-block;
  padding-bottom: 3px;
  color: var(--ink);
  transition: color var(--t-fast) var(--ease);
}
.link-route::before {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, var(--c-mist), rgba(27, 59, 92, 0.4));
  transition: background var(--t-fast) var(--ease);
}
.link-route::after {
  content: "";
  position: absolute;
  right: -3px;
  bottom: -2px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--c-cyan);
  opacity: 0;
  transform: scale(0.4);
  transition: opacity var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
}
.link-route:hover, .link-route:focus-visible { color: var(--c-cyan); }
.link-route:hover::before, .link-route:focus-visible::before {
  background: linear-gradient(90deg, var(--c-cyan), transparent);
}
.link-route:hover::after, .link-route:focus-visible::after { opacity: 1; transform: scale(1); }

.panel {
  position: relative;
  padding: clamp(20px, 2.6vw, 32px);
  border: 1px solid var(--line-2);
  border-radius: var(--radius);
  background: linear-gradient(155deg, rgba(12, 44, 74, 0.92), rgba(8, 31, 54, 0.86));
  box-shadow: var(--shadow-panel);
}
.panel::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  background-image: repeating-linear-gradient(0deg, rgba(53, 242, 224, 0.06) 0 1px, transparent 1px 4px);
}
.panel > * { position: relative; z-index: 1; }
.panel--paper {
  background: linear-gradient(160deg, #F4F8FC, #DAE7F2);
  border-color: rgba(255, 194, 75, 0.55);
  color: #082033;
}
.panel--paper::before { background-image: repeating-linear-gradient(0deg, rgba(6, 26, 46, 0.05) 0 1px, transparent 1px 5px); }
.panel--paper h2, .panel--paper h3, .panel--paper h4, .panel--paper strong { color: #061A2E; }
.panel__label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-amber);
}
.panel--paper .panel__label { color: var(--c-amber-deep); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 11px;
  border: 1px solid var(--line-2);
  border-radius: 999px;
  background: rgba(12, 44, 74, 0.65);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--c-mist);
}
.tag--cyan { color: var(--c-cyan); border-color: rgba(53, 242, 224, 0.45); }
.tag--amber { color: var(--c-amber); border-color: rgba(255, 194, 75, 0.45); }
.tag--warm { color: var(--c-orange); border-color: rgba(255, 122, 61, 0.5); }
.tag--paper { color: var(--c-amber-deep); border-color: rgba(138, 90, 0, 0.35); background: rgba(255, 255, 255, 0.62); }

.breadcrumb { margin-bottom: clamp(14px, 2vw, 22px); }
.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.breadcrumb__item { display: inline-flex; align-items: center; gap: 8px; }
.breadcrumb__link { color: var(--c-mist); transition: color var(--t-fast) var(--ease); }
.breadcrumb__link:hover { color: var(--c-cyan); }
.breadcrumb__sep { color: var(--c-grid); }
.breadcrumb__item[aria-current="page"] { color: var(--c-cyan); }

.prose { max-width: 72ch; color: var(--ink-2); font-size: 17px; line-height: 1.85; }
.prose h2, .prose h3 { color: var(--ink); margin: 1.8em 0 0.6em; }
.prose h2:first-child, .prose h3:first-child { margin-top: 0; }
.prose p { margin-bottom: 1.1em; }
.prose ul, .prose ol { margin-bottom: 1.2em; }
.prose li { position: relative; margin-bottom: 0.55em; padding-left: 18px; }
.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-cyan);
  box-shadow: 0 0 10px rgba(53, 242, 224, 0.65);
}
.prose a { color: var(--c-cyan); border-bottom: 1px solid rgba(53, 242, 224, 0.4); }
.prose a:hover { border-bottom-color: var(--c-cyan); }
.prose blockquote {
  margin: 1.4em 0;
  padding: 14px 0 14px 20px;
  border-left: 2px solid var(--c-amber);
  color: var(--ink);
}

html.js-ready [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity var(--t-slow) var(--ease), transform var(--t-slow) var(--ease);
}
html.js-ready [data-reveal].is-visible { opacity: 1; transform: none; }

/* 06 头部与导航 ---------------------------------------------------------- */
.skip-link {
  position: absolute;
  left: var(--gutter);
  top: -70px;
  z-index: 90;
  padding: 10px 16px;
  border-radius: var(--radius);
  background: var(--c-cyan);
  color: #04202A;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.12em;
  transition: top var(--t-mid) var(--ease);
}
.skip-link:focus { top: 10px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(6, 26, 46, 0.9);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line-2);
  transition: background var(--t-mid) var(--ease), border-color var(--t-mid) var(--ease);
}
.site-header[data-condensed="true"] { background: rgba(6, 26, 46, 0.97); border-bottom-color: var(--line); }
.site-header__inner {
  position: relative;
  width: 100%;
  max-width: var(--shell);
  min-height: var(--header-h);
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(14px, 3vw, 40px);
}
.site-header__aside { display: flex; align-items: center; gap: 14px; min-width: 0; }

.brand-mark { display: inline-flex; align-items: center; gap: 12px; flex: 0 0 auto; color: var(--ink); }
.brand-mark__glyph {
  width: 16px;
  height: 16px;
  flex: 0 0 auto;
  border-radius: 2px;
  background: linear-gradient(135deg, var(--c-cyan), var(--c-amber));
  transform: rotate(45deg);
  box-shadow: 0 0 0 1px rgba(53, 242, 224, 0.35), 0 0 18px -4px rgba(53, 242, 224, 0.75);
  transition: transform var(--t-mid) var(--ease), box-shadow var(--t-mid) var(--ease);
}
.brand-mark:hover .brand-mark__glyph,
.brand-mark:focus-visible .brand-mark__glyph {
  transform: rotate(135deg) scale(1.08);
  box-shadow: 0 0 0 1px rgba(255, 194, 75, 0.5), 0 0 22px -4px rgba(255, 194, 75, 0.85);
}
.brand-mark__text { display: flex; flex-direction: column; min-width: 0; line-height: 1.15; }
.brand-mark__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: 0.08em;
  white-space: nowrap;
}
.brand-mark__coord {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--c-cyan);
}

.route-nav { min-width: 0; }
.route-nav__list { position: relative; display: flex; align-items: center; gap: clamp(12px, 1.8vw, 26px); }
.route-nav__list::before {
  content: "";
  position: absolute;
  left: 4px;
  right: 4px;
  top: 50%;
  height: 1px;
  transform: translateY(-50%);
  background: linear-gradient(90deg, transparent, rgba(53, 242, 224, 0.3) 12%, rgba(27, 59, 92, 0.95) 50%, rgba(53, 242, 224, 0.3) 88%, transparent);
}
.route-nav__item { position: relative; z-index: 1; min-width: 0; }
.route-nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 2px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 13.5px;
  letter-spacing: 0.1em;
  color: var(--c-mist);
  transition: color var(--t-fast) var(--ease);
}
.route-nav__label { position: relative; white-space: nowrap; }
.route-nav__node {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--c-grid);
  box-shadow: inset 0 0 0 1px rgba(168, 191, 212, 0.4);
  transition: background var(--t-fast) var(--ease), box-shadow var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
}
.route-nav__link:hover { color: var(--ink); }
.route-nav__link:hover .route-nav__node {
  background: var(--c-cyan);
  transform: scale(1.15);
  box-shadow: 0 0 0 3px rgba(53, 242, 224, 0.16), 0 0 14px rgba(53, 242, 224, 0.85);
}
.route-nav__link[aria-current="page"] { color: var(--c-cyan); }
.route-nav__link[aria-current="page"] .route-nav__node {
  background: var(--c-cyan);
  box-shadow: 0 0 0 3px rgba(53, 242, 224, 0.18), 0 0 16px rgba(53, 242, 224, 0.9);
}
.route-nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--c-cyan), transparent);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 14px;
  border: 1px solid var(--line-2);
  border-radius: var(--radius);
  background: rgba(12, 44, 74, 0.72);
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.14em;
  transition: border-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}
.nav-toggle:hover { border-color: var(--c-cyan); color: var(--c-cyan); }
.nav-toggle__bars { position: relative; width: 18px; height: 12px; flex: 0 0 auto; }
.nav-toggle__bars span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 1.5px;
  background: currentColor;
  transition: transform var(--t-mid) var(--ease), opacity var(--t-fast) linear;
}
.nav-toggle__bars span:nth-child(1) { top: 0; }
.nav-toggle__bars span:nth-child(2) { bottom: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1) { transform: translateY(5.25px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2) { transform: translateY(-5.25px) rotate(-45deg); }
.nav-toggle__label { white-space: nowrap; }

.scroll-route {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  overflow: hidden;
  pointer-events: none;
}
.scroll-route__bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--c-cyan), var(--c-amber) 68%, var(--c-orange));
}

/* 07 页脚 ---------------------------------------------------------------- */
.site-footer {
  margin-top: clamp(60px, 9vw, 120px);
  background: linear-gradient(180deg, rgba(12, 44, 74, 0.6), rgba(6, 26, 46, 0.98) 62%);
  border-top: 1px solid var(--line-2);
}
.site-footer::before {
  content: "";
  display: block;
  height: 6px;
  background-image: repeating-linear-gradient(90deg, var(--c-grid) 0 1px, transparent 1px 24px);
}
.site-footer__inner {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding: clamp(42px, 6vw, 74px) var(--gutter) clamp(26px, 4vw, 40px);
}
.footer-brand {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 18px;
  margin-bottom: clamp(24px, 3vw, 40px);
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line-2);
}
.footer-brand__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  letter-spacing: 0.1em;
  color: var(--ink);
}
.footer-brand__note {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--ink-3);
}
.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(22px, 3vw, 42px);
}
.footer-col { min-width: 0; }
.footer-heading {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.2em;
  color: var(--c-amber);
}
.footer-heading::before { content: ""; width: 12px; height: 1px; background: var(--c-amber); }
.footer-list { display: grid; gap: 10px; }
.footer-list__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--c-mist);
  transition: color var(--t-fast) var(--ease);
}
.footer-list__link::before {
  content: "";
  width: 5px;
  height: 5px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--c-grid);
  transition: background var(--t-fast) var(--ease), box-shadow var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
}
.footer-list__link:hover, .footer-list__link:focus-visible { color: var(--c-cyan); }
.footer-list__link:hover::before, .footer-list__link:focus-visible::before {
  background: var(--c-cyan);
  transform: scale(1.2);
  box-shadow: 0 0 12px rgba(53, 242, 224, 0.85);
}
.footer-list__text { font-size: 14.5px; line-height: 1.6; color: var(--ink-3); }
.footer-contact { display: grid; gap: 12px; }
.footer-contact__row { display: grid; gap: 2px; }
.footer-contact__key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--c-cyan);
}
.footer-contact__value { font-size: 14.5px; line-height: 1.55; color: var(--ink); overflow-wrap: anywhere; }
.footer-note {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--line-2);
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-3);
}
.footer-legal__icp {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-mist);
}
.site-footer__base {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding: 18px var(--gutter) 30px;
  border-top: 1px solid var(--line-2);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 24px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--ink-3);
}
.site-footer__base-note { margin: 0; }

/* 08 媒体容器（供页面阶段放置图片） -------------------------------------- */
.media-frame {
  position: relative;
  padding: 10px;
  border: 1px solid var(--line-2);
  border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(12, 44, 74, 0.9), rgba(8, 31, 54, 0.7));
  overflow: hidden;
}
.media-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(53, 242, 224, 0.12) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(53, 242, 224, 0.12) 1px, transparent 1px);
  background-size: 28px 28px;
  opacity: 0.5;
}
.media-frame__inner {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border-radius: 2px;
  background: radial-gradient(120% 120% at 20% 10%, rgba(53, 242, 224, 0.16), rgba(6, 26, 46, 0.95) 60%);
}
.media-frame__inner::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(0deg, rgba(6, 26, 46, 0.28) 0 1px, transparent 1px 4px);
  mix-blend-mode: multiply;
}
.media-frame__img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.06);
}
.media-frame__caption {
  position: relative;
  z-index: 1;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--c-mist);
}
.media-frame--wide .media-frame__inner { aspect-ratio: 21 / 9; }
.media-frame--tall .media-frame__inner { aspect-ratio: 3 / 4; }
.media-frame--square .media-frame__inner { aspect-ratio: 1 / 1; }

/* 09 响应式 -------------------------------------------------------------- */
@media (max-width: 1180px) {
  .route-nav__list { gap: 14px; }
  .route-nav__link { font-size: 13px; letter-spacing: 0.06em; }
}

@media (max-width: 980px) {
  :root { --header-h: 64px; }
  body { font-size: 16.5px; }
  .nav-toggle { display: inline-flex; }
  .route-nav {
    position: fixed;
    left: 0;
    right: 0;
    top: var(--header-h);
    bottom: 0;
    overflow-y: auto;
    padding: clamp(22px, 6vw, 44px) var(--gutter) 48px;
    border-top: 1px solid var(--line-2);
    background: linear-gradient(180deg, rgba(6, 26, 46, 0.985), rgba(6, 26, 46, 0.95));
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-10px);
    transition: opacity var(--t-mid) var(--ease), transform var(--t-mid) var(--ease), visibility var(--t-mid) linear;
  }
  .route-nav[data-open="true"] {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0);
  }
  .route-nav__list { flex-direction: column; align-items: stretch; gap: 0; }
  .route-nav__list::before { display: none; }
  .route-nav__item { border-bottom: 1px solid var(--line-2); }
  .route-nav__link {
    width: 100%;
    padding: 18px 4px;
    font-size: 16px;
    letter-spacing: 0.14em;
  }
  .route-nav__node { width: 9px; height: 9px; }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 981px) {
  .nav-toggle { display: none; }
  .site-header[data-condensed="true"] .nav-toggle { display: inline-flex; }
  .site-header[data-condensed="true"] .route-nav {
    position: fixed;
    left: 0;
    right: 0;
    top: var(--header-h);
    bottom: 0;
    padding: clamp(40px, 7vw, 88px) var(--gutter);
    border-top: 1px solid var(--line-2);
    background: linear-gradient(180deg, rgba(6, 26, 46, 0.975), rgba(6, 26, 46, 0.93));
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-10px);
    transition: opacity var(--t-mid) var(--ease), transform var(--t-mid) var(--ease), visibility var(--t-mid) linear;
  }
  .site-header[data-condensed="true"] .route-nav[data-open="true"] {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0);
  }
  .site-header[data-condensed="true"] .route-nav__list {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 clamp(20px, 3vw, 48px);
  }
  .site-header[data-condensed="true"] .route-nav__list::before { display: none; }
  .site-header[data-condensed="true"] .route-nav__item { border-bottom: 1px solid var(--line-2); }
  .site-header[data-condensed="true"] .route-nav__link {
    width: 100%;
    padding: 26px 4px;
    font-size: clamp(18px, 1.8vw, 24px);
    letter-spacing: 0.08em;
  }
  .site-header[data-condensed="true"] .route-nav__node { width: 10px; height: 10px; }
}

@media (max-width: 900px) {
  .grid--2, .grid--3, .grid--aside { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 620px) {
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .site-footer__base { flex-direction: column; }
  .brand-mark__name { font-size: 15.5px; }
  .brand-mark__coord { font-size: 10px; letter-spacing: 0.16em; }
}

/* 10 动效偏好 ------------------------------------------------------------ */
@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;
  }
  html.js-ready [data-reveal] { opacity: 1; transform: none; }
  .btn:hover { transform: none; }
}