/* /assets/site.css — 亿博CN 中国站 共享外壳与基础组件 */

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body { margin: 0; }
h1, h2, h3, h4, p, ul, ol, figure, blockquote { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg { max-width: 100%; display: block; }
button { font: inherit; color: inherit; }
a { color: inherit; }

/* ---------- tokens ---------- */
:root {
  --ink: #0A1A2A;
  --indigo: #12283E;
  --card: #173450;
  --line: #24425C;
  --line-soft: rgba(36, 66, 92, .62);
  --mist: #E8F0F6;
  --muted: #9BB2C6;
  --cyan: #35D0C4;
  --amber: #F2A63B;
  --wine: #7C2F45;
  --violet: #4A3F86;
  --pine: #1F5F5A;
  --ochre: #8A5A2B;
  --ivory: #F2EEE4;

  --shell: 1240px;
  --gap: 24px;
  --ease: cubic-bezier(.2, .7, .3, 1);

  --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", Georgia, "Times New Roman", serif;
  --sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  --geo: "Inter Tight", "Inter", "Helvetica Neue", "PingFang SC", Arial, sans-serif;
  --mono: "JetBrains Mono", "IBM Plex Mono", "SFMono-Regular", Consolas, "Courier New", monospace;
}

/* ---------- base ---------- */
body {
  background-color: var(--ink);
  background-image:
    radial-gradient(1100px 560px at 84% -10%, rgba(53, 208, 196, .075), transparent 62%),
    radial-gradient(900px 520px at 4% 14%, rgba(74, 63, 134, .16), transparent 66%);
  background-repeat: no-repeat;
  color: var(--mist);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: .01em;
}

p { margin: 0 0 1.2em; }
p:last-child { margin-bottom: 0; }
a { text-decoration: none; }
strong { color: #fff; font-weight: 600; }

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

.skip-link {
  position: absolute;
  left: 12px;
  top: -60px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--cyan);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 13px;
  transition: top .16s var(--ease);
}
.skip-link:focus { top: 12px; }

/* ---------- layout ---------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: 20px;
}
@media (min-width: 768px) {
  .shell { padding-inline: 32px; }
}

.section {
  padding: 72px 0;
  border-top: 1px solid var(--line-soft);
}
.section--tight { padding: 48px 0; }
.section--band {
  background: var(--indigo);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.section--ivory {
  background: var(--ivory);
  color: #17242f;
  border-color: rgba(23, 36, 47, .18);
}
.section--ivory .section-title,
.section--ivory .display { color: #101c26; }

.prose { max-width: 68ch; }
.prose--wide { max-width: 78ch; }
.prose > * + * { margin-top: 1.2em; }

.grid { display: grid; gap: var(--gap); }
.grid-2 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
@media (min-width: 640px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 1024px) {
  .grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

.bento {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gap);
}
.bento__item { grid-column: span 12; }
@media (min-width: 768px) {
  .bento__item { grid-column: span var(--col, 6); grid-row: span var(--row, 1); }
}

/* ---------- typography ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0 0 14px;
}
.eyebrow::before {
  content: "";
  width: 18px;
  height: 1px;
  background: var(--cyan);
}

.display {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(32px, 4.6vw, 56px);
  line-height: 1.15;
  letter-spacing: -.012em;
  margin: 0 0 .5em;
}
.section-title {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(26px, 3.1vw, 40px);
  line-height: 1.18;
  margin: 0 0 .5em;
}
.subhead {
  font-family: var(--geo);
  font-weight: 700;
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.35;
  letter-spacing: -.005em;
  margin: 0 0 .6em;
}
.lede {
  font-size: clamp(17px, 1.6vw, 20px);
  line-height: 1.7;
  color: var(--muted);
  max-width: 62ch;
}
.mono {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: .02em;
}
.num {
  font-family: var(--mono);
  color: var(--amber);
  font-weight: 600;
  letter-spacing: .01em;
}
.section--ivory .mono,
.section--ivory .lede { color: #4a5a68; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 20px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--mist);
  font-family: var(--geo);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .01em;
  cursor: pointer;
  transition: border-color .16s var(--ease), color .16s var(--ease), background-color .16s var(--ease);
}
.btn:hover { border-color: var(--cyan); color: var(--cyan); }
.btn--amber {
  background: var(--amber);
  border-color: var(--amber);
  color: #241704;
}
.btn--amber:hover { background: #f7b455; border-color: #f7b455; color: #241704; }
.btn--ghost { border-color: var(--line-soft); color: var(--muted); }
.btn--sm { padding: 7px 14px; font-size: 13.5px; }

/* ---------- tags & chips ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(53, 208, 196, .06);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .04em;
  white-space: nowrap;
}
.tag--wine { border-color: var(--wine); background: rgba(124, 47, 69, .2); color: #e6b9c6; }
.tag--violet { border-color: var(--violet); background: rgba(74, 63, 134, .2); color: #c3bce8; }
.tag--pine { border-color: var(--pine); background: rgba(31, 95, 90, .2); color: #a9dcd6; }
.tag--ochre { border-color: var(--ochre); background: rgba(138, 90, 43, .2); color: #e6c69c; }
.tag--amber { border-color: var(--amber); background: rgba(242, 166, 59, .16); color: var(--amber); }

.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  padding: 6px 15px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  font-size: 14px;
  cursor: pointer;
  transition: border-color .16s var(--ease), color .16s var(--ease), background-color .16s var(--ease);
}
.chip:hover { border-color: var(--cyan); color: var(--cyan); }
.chip[aria-pressed="true"] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
}

/* ---------- cards & panels ---------- */
.card {
  position: relative;
  padding: 24px;
  background: var(--card);
  border: 1px solid var(--line);
  box-shadow: inset 0 1px 0 rgba(232, 240, 246, .045);
  transition: border-color .16s var(--ease), transform .16s var(--ease), box-shadow .16s var(--ease);
}
.card:hover {
  border-color: var(--cyan);
  transform: translateY(-1px);
  box-shadow: 0 14px 30px -22px rgba(0, 0, 0, .95), inset 0 1px 0 rgba(232, 240, 246, .06);
}
.panel {
  padding: 22px 24px;
  background: var(--indigo);
  border: 1px solid var(--line);
}
.panel--ivory {
  background: var(--ivory);
  color: #1d2c38;
  border-color: rgba(29, 44, 56, .16);
}

/* ---------- breadcrumb ---------- */
.crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--muted);
}
.crumb a {
  color: var(--muted);
  border-bottom: 1px solid transparent;
  transition: color .16s var(--ease), border-color .16s var(--ease);
}
.crumb a:hover { color: var(--cyan); border-color: var(--cyan); }
.crumb__sep { color: var(--line); }

/* ---------- axis (batch timeline) ---------- */
.axis { position: relative; padding-top: 34px; }
.axis__track {
  position: absolute;
  top: 10px;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--line);
}
.axis__node {
  position: relative;
  padding-top: 16px;
  border-top: 1px solid transparent;
  transition: transform .14s var(--ease);
}
.axis__node::before {
  content: "";
  position: absolute;
  top: -6px;
  left: 0;
  width: 9px;
  height: 9px;
  background: var(--ink);
  border: 1px solid var(--cyan);
  transform: rotate(45deg);
}
.axis__node:hover { transform: scale(1.1); transform-origin: left top; }

/* ---------- drawer ---------- */
.drawer {
  border: 1px solid var(--line);
  background: var(--indigo);
}
.drawer + .drawer { margin-top: 10px; }
.drawer__head {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 15px 18px;
  background: none;
  border: 0;
  color: var(--mist);
  text-align: left;
  cursor: pointer;
  transition: color .16s var(--ease);
}
.drawer__head:hover { color: var(--cyan); }
.drawer__title { font-family: var(--geo); font-weight: 700; font-size: 16px; }
.drawer__sign {
  font-family: var(--mono);
  font-size: 15px;
  color: var(--cyan);
  transition: transform .18s var(--ease);
}
.drawer[data-open] .drawer__sign { transform: rotate(45deg); }
.drawer__body {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows .18s var(--ease);
}
.drawer[data-open] .drawer__body { grid-template-rows: 1fr; }
.drawer__body > div { overflow: hidden; }
.drawer__inner {
  padding: 0 18px 18px;
  color: var(--muted);
  font-size: 15.5px;
}

/* ---------- figure ---------- */
.frame {
  position: relative;
  overflow: hidden;
  background: var(--indigo);
  border: 1px solid var(--line);
}
.frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.frame--16x9 { aspect-ratio: 16 / 9; }
.frame--4x3 { aspect-ratio: 4 / 3; }
.frame--1x1 { aspect-ratio: 1 / 1; }
.frame--tall { aspect-ratio: 3 / 4; }
.frame__cap {
  display: block;
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
  background: var(--indigo);
}

/* ---------- reveal ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity .2s var(--ease), transform .2s var(--ease);
}
.js [data-reveal].is-in { opacity: 1; transform: none; }

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: rgba(10, 26, 42, .95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.header-rail {
  background: var(--indigo);
  border-bottom: 1px solid var(--line-soft);
  max-height: 60px;
  overflow: hidden;
  transition: max-height .2s var(--ease), opacity .2s var(--ease), border-color .2s var(--ease);
}
.site-header.is-shrunk .header-rail {
  max-height: 0;
  opacity: 0;
  border-color: transparent;
}
.header-rail__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 54px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--mist);
}
.brand__mark {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  flex: none;
  border: 1px solid var(--line);
  background: rgba(53, 208, 196, .08);
  color: var(--cyan);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .04em;
}
.brand__text { display: flex; flex-direction: column; line-height: 1.15; }
.brand__name {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: .01em;
}
.brand__sub {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .08em;
  color: var(--muted);
}
.brand--footer .brand__name { font-size: 19px; }

.rail-meta {
  display: none;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font-size: 12.5px;
}
.rail-meta .mono { color: var(--cyan); }
.rail-meta__dot {
  width: 4px;
  height: 4px;
  background: var(--amber);
  transform: rotate(45deg);
}
@media (min-width: 901px) {
  .rail-meta { display: flex; }
}

.terminal {
  display: inline-flex;
  flex: none;
  border: 1px solid var(--line);
  background: rgba(10, 26, 42, .6);
}
.terminal__btn {
  padding: 6px 12px;
  border: 0;
  background: transparent;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: .04em;
  cursor: pointer;
  transition: background-color .15s var(--ease), color .15s var(--ease);
}
.terminal__btn + .terminal__btn { border-left: 1px solid var(--line); }
.terminal__btn:hover { color: var(--mist); }
.terminal__btn.is-active {
  background: var(--cyan);
  color: var(--ink);
}

.command-bar { position: relative; }
.command-bar__inner {
  display: flex;
  align-items: center;
  gap: 16px;
  min-height: 54px;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--mist);
  cursor: pointer;
  transition: border-color .16s var(--ease), color .16s var(--ease);
}
.nav-toggle:hover { border-color: var(--cyan); color: var(--cyan); }
.nav-toggle__bars { display: grid; gap: 3px; width: 16px; }
.nav-toggle__bars i {
  display: block;
  height: 1px;
  background: currentColor;
}
.nav-toggle__label {
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: .06em;
}

.primary-nav { flex: 1 1 auto; min-width: 0; }
.nav-list {
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
}
.nav-list a {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 8px 12px;
  border: 1px solid transparent;
  color: var(--muted);
  font-size: 15px;
  letter-spacing: .02em;
  transition: color .16s var(--ease), border-color .16s var(--ease), background-color .16s var(--ease);
}
.nav-list a:hover { color: var(--mist); border-color: var(--line); }
.nav-idx {
  font-size: 11px;
  color: var(--line);
  transition: color .16s var(--ease);
}
.nav-list a:hover .nav-idx { color: var(--cyan); }
.nav-list a[aria-current="page"] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
  box-shadow: inset 0 -2px 0 var(--amber);
}
.nav-list a[aria-current="page"] .nav-idx { color: rgba(10, 26, 42, .6); }

.bar-cta {
  margin-left: auto;
  flex: none;
  padding: 8px 16px;
  border: 1px solid var(--amber);
  background: var(--amber);
  color: #241704;
  font-family: var(--geo);
  font-size: 14px;
  font-weight: 700;
  transition: filter .16s var(--ease), background-color .16s var(--ease);
}
.bar-cta:hover { filter: brightness(1.08); }

.scroll-meter {
  height: 2px;
  background: rgba(36, 66, 92, .5);
}
.scroll-meter__fill {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--cyan), var(--amber));
}

/* ---------- footer ---------- */
.site-footer {
  background: var(--indigo);
  border-top: 1px solid var(--line);
}
.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
  padding: 56px 0 34px;
}
@media (min-width: 900px) {
  .footer-top { grid-template-columns: minmax(0, 1fr) minmax(0, 1.55fr); gap: 56px; }
}
.footer-brand { max-width: 40ch; }
.footer-line {
  margin: 18px 0 0;
  font-size: 15px;
  color: var(--muted);
  line-height: 1.7;
}
.footer-stamp { margin: 14px 0 0; }
.footer-stamp .mono { color: var(--line); letter-spacing: .06em; }

.footer-cols {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px 24px;
}
@media (min-width: 900px) {
  .footer-cols { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}
.footer-col__title {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-soft);
  font-family: var(--geo);
  font-size: 15px;
  font-weight: 700;
  color: var(--mist);
}
.footer-col__title .mono { font-size: 11px; color: var(--cyan); }
.footer-col ul { display: grid; gap: 9px; }
.footer-col a,
.copy-btn {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 0;
  border: 0;
  background: none;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.5;
  text-align: left;
  cursor: pointer;
  transition: color .16s var(--ease);
}
.footer-col a:hover,
.copy-btn:hover { color: var(--cyan); }
.copy-btn .mono { font-size: 11px; color: var(--line); }

[data-copy] { position: relative; }
[data-copy].is-copied { color: var(--cyan); }
[data-copy].is-copied::after {
  content: "已复制";
  position: absolute;
  left: 0;
  top: -2.1em;
  padding: 2px 8px;
  background: var(--cyan);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .04em;
  white-space: nowrap;
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 28px;
  padding: 20px 0 34px;
  border-top: 1px solid var(--line-soft);
  font-size: 13px;
  color: var(--muted);
}
.footer-base p { margin: 0; }
.footer-legal { font-family: var(--mono); font-size: 12.5px; }
.footer-addr { color: var(--line); }
.footer-note { color: var(--line); }

/* ---------- responsive header ---------- */
@media (max-width: 900px) {
  .nav-toggle { display: inline-flex; }
  .primary-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: calc(100% + 6px);
    display: none;
    padding: 8px;
    background: var(--indigo);
    border: 1px solid var(--line);
    box-shadow: 0 22px 44px -26px rgba(0, 0, 0, .95);
    z-index: 90;
  }
  .primary-nav[data-open] { display: block; }
  .nav-list { flex-direction: column; gap: 2px; }
  .nav-list a {
    justify-content: flex-start;
    padding: 11px 12px;
    border-left: 2px solid transparent;
    font-size: 15.5px;
  }
  .nav-list a[aria-current="page"] {
    box-shadow: none;
    border-left-color: var(--amber);
  }
  .command-bar__inner { min-height: 52px; gap: 10px; }
  .bar-cta { padding: 8px 12px; font-size: 13px; }
  .footer-addr, .footer-note { flex: 1 1 100%; }
}

@media (max-width: 420px) {
  .brand__sub { display: none; }
  .terminal__btn { padding: 6px 9px; font-size: 11.5px; }
}

/* ---------- motion preferences ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  .js [data-reveal] { opacity: 1 !important; transform: none !important; }
  .card:hover { transform: none; }
  .axis__node:hover { transform: none; }
}