/* ============================================================
   优发国际址 — 共享样式 /assets/site.css
   深靛蓝纸面 · 网格索引卡 · 双层栏目轨道 · 常驻收藏条
   ============================================================ */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

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

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

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

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

a { color: inherit; }

/* ---------- 2. 设计变量 ---------- */
:root {
  --ink-900: #0B1230;
  --ink-800: #141C41;
  --ink-700: #1D2755;
  --line-600: #2C3873;
  --mist-050: #EDF1FA;
  --slate-300: #9AA5C8;
  --teal-400: #2ED6B4;
  --orange-500: #FF8A3D;
  --paper-050: #F5F1E8;
  --grayblue-200: #C4CDE4;
  --ink-950: #070C22;

  --shadow-hard: 6px 6px 0 rgba(7, 12, 34, .78);
  --shadow-soft: 3px 3px 0 rgba(7, 12, 34, .55);
  --max-width: 1180px;
  --gutter: clamp(16px, 4vw, 40px);
  --radius: 2px;
  --ease: cubic-bezier(.2, .7, .3, 1);
  --dur: 180ms;

  --font-sans: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", "JetBrains Mono", "Cascadia Mono",
    Consolas, "Courier New", monospace;
}

/* ---------- 3. 页面基座 ---------- */
body {
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: 15.5px;
  font-weight: 400;
  line-height: 1.7;
  letter-spacing: .01em;
  color: var(--mist-050);
  background-color: var(--ink-900);
  background-image:
    repeating-linear-gradient(115deg, rgba(237, 241, 250, .014) 0 2px, transparent 2px 6px),
    linear-gradient(to right, rgba(237, 241, 250, .04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(237, 241, 250, .04) 1px, transparent 1px),
    radial-gradient(1100px 560px at 10% -8%, rgba(46, 214, 180, .09), transparent 62%),
    radial-gradient(900px 520px at 102% 2%, rgba(255, 138, 61, .08), transparent 58%);
  background-size: 100% 100%, 34px 34px, 34px 34px, 100% 100%, 100% 100%;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 { font-weight: 700; line-height: 1.25; letter-spacing: -.01em; color: var(--mist-050); }

h1 {
  font-size: clamp(38px, 6.4vw, 84px);
  font-weight: 300;
  line-height: 1.05;
  letter-spacing: -.02em;
}

h2 { font-size: clamp(24px, 3.2vw, 34px); }

h3 { font-size: 20px; font-weight: 500; line-height: 1.4; }

p { color: var(--slate-300); }

strong { color: var(--mist-050); font-weight: 700; }

.mono {
  font-family: var(--font-mono);
  font-size: .92em;
  letter-spacing: .06em;
  font-weight: 400;
}

/* ---------- 4. 布局工具 ---------- */
.wrap {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.wrap--narrow { max-width: 820px; }

.section { padding-block: clamp(40px, 6vw, 88px); }

.section--tight { padding-block: clamp(24px, 4vw, 48px); }

.section__head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding-bottom: 12px;
  margin-bottom: 24px;
  border-bottom: 2px solid var(--line-600);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: .12em;
  color: var(--slate-300);
}

.rule { height: 2px; border: 0; background: var(--line-600); margin-block: 24px; }

.stack > * + * { margin-top: 12px; }

.prose { max-width: 68ch; }

.prose > * + * { margin-top: 14px; }

.prose p { color: var(--slate-300); }

.prose ul { display: flex; flex-direction: column; gap: 8px; }

.prose li {
  position: relative;
  padding-left: 20px;
  color: var(--slate-300);
}

.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 10px;
  height: 2px;
  background: var(--orange-500);
}

.grid { display: grid; gap: 12px; }

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

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

.grid--sidebar {
  grid-template-columns: minmax(200px, 280px) minmax(0, 1fr);
  gap: 32px;
  align-items: start;
}

/* ---------- 5. 按钮 · 芯片 · 焦点 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 14px;
  border: 2px solid var(--line-600);
  border-radius: var(--radius);
  background: transparent;
  color: var(--mist-050);
  font-size: 13.5px;
  font-weight: 500;
  letter-spacing: .04em;
  text-decoration: none;
  cursor: pointer;
  transition: transform var(--dur) var(--ease), background-color var(--dur) var(--ease),
    color var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.btn:hover { transform: translate(-1px, -1px); box-shadow: var(--shadow-soft); }

.btn:active { transform: translate(0, 0); box-shadow: none; }

.btn--primary {
  background: var(--orange-500);
  border-color: var(--ink-950);
  color: var(--ink-950);
  font-weight: 700;
  box-shadow: 4px 4px 0 var(--line-600);
}

.btn--ghost { border-color: var(--teal-400); color: var(--teal-400); }

.btn--ghost[aria-pressed="true"] {
  background: var(--teal-400);
  border-color: var(--mist-050);
  color: #07152A;
  font-weight: 700;
}

.btn--quiet { border-color: transparent; color: var(--slate-300); }

.btn--quiet:hover { border-color: var(--line-600); color: var(--mist-050); }

.chip {
  padding: 6px 12px;
  border: 2px solid var(--line-600);
  border-radius: var(--radius);
  background: transparent;
  color: var(--slate-300);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  cursor: pointer;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.chip:hover { border-color: var(--teal-400); color: var(--mist-050); }

.chip[aria-pressed="true"] {
  background: var(--teal-400);
  border-color: var(--teal-400);
  color: #07152A;
  font-weight: 700;
}

:focus-visible {
  outline: 2px solid var(--teal-400);
  outline-offset: 2px;
  border-radius: var(--radius);
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  padding: 10px 16px;
  background: var(--teal-400);
  border: 2px solid var(--ink-950);
  color: #07152A;
  font-weight: 700;
  letter-spacing: .04em;
  text-decoration: none;
  transform: translateY(-220%);
  transition: transform var(--dur) var(--ease);
}

.skip-link:focus { transform: none; }

/* ---------- 6. 页头：双层栏目轨道 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: linear-gradient(180deg, rgba(11, 18, 48, .99), rgba(20, 28, 65, .97));
  border-bottom: 2px solid var(--line-600);
  box-shadow: 0 10px 26px rgba(7, 12, 34, .5);
}

.site-header__sheet {
  max-width: var(--max-width);
  margin-inline: auto;
  padding: 12px var(--gutter) 12px;
}

.site-header__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  background: var(--teal-400);
  color: #07152A;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: .06em;
  border: 2px solid var(--mist-050);
  box-shadow: 4px 4px 0 var(--orange-500);
}

.brand__text { display: block; }

.brand__name {
  display: block;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--mist-050);
}

.brand__tagline {
  display: block;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--slate-300);
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-left: auto;
}

.header-meta {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 6px 10px;
  border: 1px dashed var(--line-600);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--slate-300);
}

.header-meta__label { color: var(--slate-300); }

.header-meta__value { color: var(--mist-050); font-weight: 500; }

.nav-toggle {
  position: relative;
  padding: 9px 14px 9px 34px;
  border: 2px solid var(--line-600);
  border-radius: var(--radius);
  background: var(--ink-700);
  color: var(--mist-050);
  font-size: 13.5px;
  font-weight: 500;
  letter-spacing: .04em;
  cursor: pointer;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.nav-toggle::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 50%;
  width: 12px;
  height: 2px;
  background: var(--teal-400);
  box-shadow: 0 -4px 0 var(--teal-400), 0 4px 0 var(--teal-400);
  transform: translateY(-50%);
  transition: transform var(--dur) var(--ease);
}

.nav-toggle[aria-expanded="false"]::before {
  background: var(--orange-500);
  box-shadow: 0 -4px 0 var(--orange-500), 0 4px 0 var(--orange-500);
}

.nav-toggle:hover { border-color: var(--teal-400); }

/* 导出面板 */
.export-panel {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 12px;
  padding: 12px 14px;
  background: var(--ink-800);
  border: 2px dashed var(--line-600);
}

.export-panel[hidden] { display: none; }

.export-panel__title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--slate-300);
}

.export-panel__formats { display: flex; gap: 8px; flex-wrap: wrap; }

.export-panel__note {
  margin: 0;
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--teal-400);
}

/* 栏目轨道 */
.site-header__track {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--line-600);
}

[data-nav-shell][data-open="false"] .nav-track { display: none; }

.nav-track__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
}

.nav-track__item { display: block; }

.nav-link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border: 2px solid transparent;
  border-radius: var(--radius);
  color: var(--slate-300);
  font-size: 14.5px;
  font-weight: 500;
  letter-spacing: .02em;
  text-decoration: none;
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease),
    border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.nav-link:hover {
  color: var(--mist-050);
  background: var(--ink-700);
  border-color: var(--line-600);
}

.nav-link[aria-current="page"] {
  color: #07152A;
  background: var(--teal-400);
  border-color: var(--mist-050);
  font-weight: 700;
  box-shadow: var(--shadow-soft);
}

.nav-link__index {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  opacity: .78;
}

/* ---------- 7. 内容组件 ---------- */
.card {
  position: relative;
  padding: 20px;
  background: var(--ink-700);
  border: 2px solid var(--line-600);
  box-shadow: var(--shadow-hard);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.card:hover {
  transform: translate(-2px, -2px);
  border-color: var(--teal-400);
  box-shadow: 8px 8px 0 rgba(7, 12, 34, .8);
}

.card h3 { color: var(--mist-050); }

.card p { color: var(--slate-300); }

.card > * + * { margin-top: 10px; }

.card__meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--slate-300);
}

.card--paper {
  background: var(--paper-050);
  border-color: var(--ink-950);
  color: var(--ink-900);
}

.card--paper h3,
.card--paper strong { color: var(--ink-900); }

.card--paper p,
.card--paper .card__meta { color: #3D466F; }

.num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.6vw, 42px);
  font-weight: 400;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--orange-500);
}

.status {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
}

.status::before {
  content: "";
  width: 8px;
  height: 8px;
  background: currentColor;
}

.status--ok { color: var(--teal-400); }

.status--todo { color: var(--orange-500); }

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  padding-block: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--slate-300);
}

.breadcrumb a { color: var(--slate-300); text-decoration: none; }

.breadcrumb a:hover { color: var(--teal-400); }

.breadcrumb__sep { color: var(--line-600); }

/* 图片容器基础规则（页面阶段放置占位或图片） */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background-color: var(--ink-700);
  background-image:
    linear-gradient(to right, rgba(237, 241, 250, .06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(237, 241, 250, .06) 1px, transparent 1px);
  background-size: 28px 28px, 28px 28px;
  border: 2px solid var(--line-600);
  box-shadow: var(--shadow-hard);
}

.media-frame > img,
.media-frame > picture > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame--tall { aspect-ratio: 4 / 5; }

.media-frame--square { aspect-ratio: 1 / 1; }

.media-frame__caption {
  padding: 10px 12px;
  border-top: 2px solid var(--line-600);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--slate-300);
}

.media-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

/* ---------- 8. 页脚与常驻收藏条 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(56px, 8vw, 96px);
  padding-top: clamp(40px, 6vw, 64px);
  padding-bottom: clamp(150px, 16vw, 190px);
  background: linear-gradient(180deg, var(--ink-800), var(--ink-900) 70%);
  border-top: 2px solid var(--line-600);
}

.site-footer__inner {
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 2fr);
  gap: 40px;
  align-items: start;
}

.footer-brand__mark {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--mist-050);
}

.footer-brand__note {
  margin-top: 10px;
  max-width: 34ch;
  font-size: 13.5px;
  color: var(--slate-300);
}

.footer-brand__version {
  display: inline-block;
  margin-top: 14px;
  padding: 5px 10px;
  border: 2px solid var(--line-600);
  color: var(--teal-400);
  font-size: 12px;
}

.footer-columns {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.footer-col__title {
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--slate-300);
}

.footer-col__list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-col__link {
  display: inline-block;
  padding-bottom: 2px;
  border-bottom: 2px solid transparent;
  color: var(--mist-050);
  font-size: 14.5px;
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.footer-col__link:hover { color: var(--teal-400); border-bottom-color: var(--teal-400); }

.footer-col__line {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--slate-300);
}

.site-footer__legal {
  max-width: var(--max-width);
  margin: clamp(28px, 4vw, 44px) auto 0;
  padding: 16px var(--gutter) 0;
  border-top: 1px solid var(--line-600);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.legal-line {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--slate-300);
}

.collect-bar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 70;
  background: rgba(11, 18, 48, .98);
  border-top: 2px solid var(--teal-400);
  box-shadow: 0 -10px 26px rgba(7, 12, 34, .55);
}

.collect-bar__inner {
  max-width: var(--max-width);
  margin-inline: auto;
  padding: 10px var(--gutter) calc(10px + env(safe-area-inset-bottom, 0px));
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.collect-bar__stat {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  font-size: 13px;
  color: var(--slate-300);
}

.collect-bar__stat .mono { color: var(--teal-400); font-size: 14px; }

.collect-bar__dot { color: var(--line-600); }

.collect-bar__formats { display: flex; gap: 8px; flex-wrap: wrap; }

/* ---------- 9. 进场动效 ---------- */
.js-ready .reveal {
  opacity: 0;
  transform: translateY(12px);
}

.js-ready .reveal.is-visible {
  opacity: 1;
  transform: none;
  transition: opacity 220ms var(--ease), transform 220ms var(--ease);
}

/* ---------- 10. 响应式 ---------- */
@media (max-width: 1080px) {
  .site-footer__inner { grid-template-columns: 1fr; gap: 32px; }
}

@media (max-width: 960px) {
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--sidebar { grid-template-columns: 1fr; gap: 24px; }
}

@media (max-width: 900px) {
  .site-header__top { align-items: flex-start; }

  .header-tools { width: 100%; margin-left: 0; }

  .nav-toggle { order: -1; }

  .nav-track__list { flex-direction: column; align-items: stretch; }

  .nav-link { width: 100%; }

  .site-header__track { margin-top: 10px; }
}

@media (max-width: 720px) {
  body { font-size: 15px; }

  .grid--2, .grid--3 { grid-template-columns: 1fr; }

  .footer-columns { grid-template-columns: 1fr; gap: 20px; }

  .card { padding: 16px; box-shadow: 4px 4px 0 rgba(7, 12, 34, .78); }

  .collect-bar__inner { justify-content: flex-start; }

  .collect-bar__stat { width: 100%; padding-bottom: 4px; }

  .collect-bar__formats { order: 2; }

  .collect-bar__inner > .btn { order: 3; margin-left: auto; }

  .site-footer__legal { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 480px) {
  .brand__mark { width: 40px; height: 40px; font-size: 15px; }

  .btn { padding: 8px 12px; font-size: 13px; }

  .header-meta { padding: 4px 8px; }
}

/* ---------- 11. 降低动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
    scroll-behavior: auto !important;
  }

  .js-ready .reveal { opacity: 1; transform: none; }

  .card:hover,
  .btn:hover { transform: none; }
}