/* ============================================================
   安信10指南 · 共享站点样式 /assets/site.css
   档案轨道 + 命令栏 + 版式底座
   ============================================================ */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 6.5rem;
}

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%; }

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

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

/* ---------- tokens ---------- */
:root {
  --ink: #162321;
  --slate: #233B38;
  --paper: #F4EFE5;
  --card: #FBF8F0;
  --orange: #E8642C;
  --green: #2FBF7A;
  --amber: #B5762B;
  --line: #D8D0C2;
  --mute: #5E7772;
  --rust: #8C3F1E;

  --rail-w: 220px;
  --bar-pad: clamp(16px, 3vw, 40px);
  --shell-max: 1180px;
  --radius: 2px;

  --font-display: "Noto Serif SC", "Source Han Serif SC", "Songti SC", Georgia, serif;
  --font-body: "Inter", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "IBM Plex Mono", "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --fs-xs: 11.5px;
  --fs-sm: 13px;
  --fs-base: clamp(16px, 0.35vw + 15px, 17.5px);
  --fs-lg: clamp(18px, 0.9vw + 16px, 21px);
  --fs-xl: clamp(22px, 1.5vw + 18px, 28px);
  --fs-2xl: clamp(28px, 3vw + 18px, 42px);
  --fs-3xl: clamp(34px, 4.6vw + 16px, 66px);

  --shadow-soft: 0 16px 30px -28px rgba(22, 35, 33, 0.65);
  --ease: cubic-bezier(0.3, 0.7, 0.4, 1);
}

/* ---------- base ---------- */
body {
  min-height: 100vh;
  background-color: var(--paper);
  background-image:
    repeating-linear-gradient(180deg, rgba(22, 35, 33, 0.022) 0 1px, transparent 1px 6px);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--fs-base);
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: 0.005em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--ink);
  text-wrap: balance;
}

h1 { font-size: var(--fs-3xl); }
h2 { font-size: var(--fs-2xl); }
h3 { font-size: var(--fs-xl); }
h4 { font-size: var(--fs-lg); }

p { text-wrap: pretty; }

strong, b { font-weight: 700; }

small { font-size: var(--fs-xs); }

::selection { background: rgba(232, 100, 44, 0.24); color: var(--ink); }

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

.text-mute { color: var(--mute); }

:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 3px;
  border-radius: 1px;
}

/* ---------- skip link ---------- */
.skip-link {
  position: fixed;
  top: -72px;
  left: 16px;
  z-index: 300;
  padding: 10px 18px;
  background: var(--ink);
  color: var(--paper);
  font-size: var(--fs-sm);
  letter-spacing: 0.04em;
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  transition: top 0.18s var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible {
  top: 12px;
  outline: 2px solid var(--orange);
  outline-offset: 3px;
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  padding: 12px 20px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  background: var(--card);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.03em;
  line-height: 1.2;
  cursor: pointer;
  transition: background-color 0.18s var(--ease), border-color 0.18s var(--ease),
    color 0.18s var(--ease), transform 0.18s var(--ease), box-shadow 0.18s var(--ease);
}

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

.btn--primary {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--ink);
  box-shadow: 0 10px 18px -16px rgba(140, 63, 30, 0.9);
}

.btn--primary:hover {
  background: var(--rust);
  border-color: var(--rust);
  color: var(--card);
}

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

.btn--ghost:hover {
  background: var(--card);
  border-color: var(--ink);
}

.btn--sm {
  padding: 8px 14px;
  font-size: var(--fs-sm);
}

/* ---------- header : brand rail ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
}

.brand-rail {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px var(--bar-pad);
  background: var(--slate);
  color: var(--paper);
  border-bottom: 1px solid rgba(244, 239, 229, 0.12);
}

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

.brand-mark {
  display: inline-grid;
  place-items: center;
  flex: 0 0 auto;
  width: 38px;
  height: 38px;
  background: var(--orange);
  color: #162321;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  border-radius: var(--radius);
  box-shadow: inset 0 0 0 1px rgba(22, 35, 33, 0.28);
}

.brand-mark--inv {
  background: transparent;
  color: var(--paper);
  border: 1px solid rgba(244, 239, 229, 0.42);
  box-shadow: none;
}

.brand-rail__name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
  letter-spacing: 0.02em;
  line-height: 1.1;
  color: var(--paper);
  white-space: nowrap;
}

.brand-rail__sub {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.2em;
  color: rgba(244, 239, 229, 0.62);
  white-space: nowrap;
}

.rail-scale { display: none; }

.rail-meta { display: none; }

.rail-note { display: none; }

/* ---------- header : command bar ---------- */
.command-bar {
  position: relative;
  background: rgba(244, 239, 229, 0.95);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
  color: var(--ink);
}

.command-bar__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px 14px;
  flex-wrap: wrap;
  padding: 7px var(--bar-pad);
  border-bottom: 1px solid rgba(216, 208, 194, 0.72);
}

.command-line {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--mute);
}

.command-line__key {
  font-weight: 600;
  color: var(--ink);
}

.command-line__val {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 700;
  color: var(--rust);
  letter-spacing: 0.06em;
}

.command-line__val::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 3px rgba(47, 191, 122, 0.18);
}

.command-line__sep { color: var(--line); }

.command-line__link {
  color: var(--mute);
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.command-line__link:hover {
  color: var(--ink);
  border-bottom-color: var(--orange);
}

.command-bar__actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ---------- header : nav ---------- */
.cmd-nav { display: block; }

.cmd-nav__list {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  padding: 0 var(--bar-pad);
}

.cmd-nav__item { flex: 0 0 auto; }

.cmd-nav__link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 7px;
  padding: 9px 0 10px;
  margin-right: 20px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--mute);
  transition: color 0.18s var(--ease);
}

.cmd-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 3px;
  height: 2px;
  background: var(--orange);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.22s var(--ease);
}

.cmd-nav__link:hover { color: var(--ink); }
.cmd-nav__link:hover::after { transform: scaleX(1); }

.cmd-nav__link[aria-current="page"] {
  color: var(--ink);
  font-weight: 600;
}

.cmd-nav__link[aria-current="page"]::after { transform: scaleX(1); }

.cmd-nav__idx {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  color: var(--line);
  transition: color 0.18s var(--ease);
}

.cmd-nav__link:hover .cmd-nav__idx,
.cmd-nav__link[aria-current="page"] .cmd-nav__idx { color: var(--orange); }

.cmd-nav__label { white-space: nowrap; }

/* ---------- header : toggle ---------- */
.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 11px;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: var(--fs-sm);
  letter-spacing: 0.08em;
  color: var(--ink);
  cursor: pointer;
  transition: border-color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.nav-toggle:hover {
  border-color: var(--ink);
  background: var(--card);
}

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 12px;
  border-top: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
}

.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 3px;
  height: 2px;
  background: currentColor;
  opacity: 1;
  transition: opacity 0.18s var(--ease);
}

.nav-toggle__text { line-height: 1; }

.site-header[data-open] .nav-toggle {
  border-color: var(--orange);
  color: var(--rust);
}

.site-header[data-open] .nav-toggle__bars::after { opacity: 0; }

/* ---------- header : scroll progress ---------- */
.command-bar__progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--orange), var(--amber));
  transform: scaleX(var(--scroll-progress, 0));
  transform-origin: 0 50%;
  transition: transform 0.12s linear;
  pointer-events: none;
}

/* ---------- footer ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 7vw, 96px);
  background: var(--ink);
  color: var(--paper);
  overflow: hidden;
}

.footer-ridge {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: clamp(46px, 7vw, 92px);
  background: linear-gradient(180deg, rgba(47, 191, 122, 0.18), rgba(47, 191, 122, 0));
  clip-path: polygon(0 100%, 0 66%, 7% 44%, 14% 62%, 23% 26%, 32% 56%, 41% 36%,
    51% 70%, 60% 46%, 69% 74%, 78% 48%, 87% 66%, 94% 40%, 100% 58%, 100% 100%);
  pointer-events: none;
}

.footer-inner {
  position: relative;
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: clamp(44px, 6vw, 76px) var(--bar-pad) 26px;
}

.footer-grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  grid-template-columns: 1fr;
}

.footer-brand__mark { margin-bottom: 14px; }

.footer-brand__name {
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--paper);
  line-height: 1.2;
}

.footer-brand__line {
  margin-top: 8px;
  font-size: var(--fs-sm);
  letter-spacing: 0.06em;
  color: rgba(244, 239, 229, 0.6);
}

.footer-col__title {
  position: relative;
  padding-bottom: 10px;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: rgba(244, 239, 229, 0.55);
}

.footer-col__title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 22px;
  height: 2px;
  background: var(--orange);
}

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

.footer-col__link {
  display: inline-block;
  padding: 5px 0;
  font-size: 14.5px;
  color: rgba(244, 239, 229, 0.8);
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.footer-col__link:hover {
  color: var(--paper);
  border-bottom-color: var(--orange);
}

.footer-contact {
  display: grid;
  gap: 10px 32px;
  margin-top: clamp(28px, 4vw, 46px);
  padding-top: 22px;
  border-top: 1px solid rgba(244, 239, 229, 0.16);
}

.footer-contact__row {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-size: var(--fs-sm);
  min-width: 0;
}

.footer-contact__k {
  flex: 0 0 auto;
  min-width: 66px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  color: rgba(244, 239, 229, 0.45);
}

.footer-contact__v {
  color: rgba(244, 239, 229, 0.88);
  word-break: break-word;
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 20px;
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid rgba(244, 239, 229, 0.16);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: rgba(244, 239, 229, 0.55);
}

.footer-base__legal {
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
}

.footer-base__copy { margin-left: auto; }

/* ---------- shared layout ---------- */
.container {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--bar-pad);
}

.section { padding-block: clamp(34px, 5.5vw, 72px); }

.grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 28px);
  grid-template-columns: 1fr;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--mute);
}

.eyebrow::before {
  content: "";
  width: 18px;
  height: 1px;
  background: var(--orange);
}

/* ---------- breadcrumbs ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--mute);
}

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

.breadcrumbs a {
  color: var(--mute);
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.breadcrumbs a:hover {
  color: var(--ink);
  border-bottom-color: var(--orange);
}

.breadcrumbs__sep { color: var(--line); }

.breadcrumbs [aria-current="page"] { color: var(--ink); }

/* ---------- tags ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--card);
  color: var(--mute);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.06em;
  line-height: 1.5;
  white-space: nowrap;
}

.tag--green {
  color: #1B7A4C;
  border-color: rgba(47, 191, 122, 0.55);
  background: rgba(47, 191, 122, 0.12);
}

.tag--amber {
  color: var(--rust);
  border-color: rgba(181, 118, 43, 0.45);
  background: rgba(181, 118, 43, 0.12);
}

.tag--orange {
  color: var(--rust);
  border-color: rgba(232, 100, 44, 0.5);
  background: rgba(232, 100, 44, 0.12);
}

.tag__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

/* ---------- media frame ---------- */
.media-frame {
  position: relative;
  padding: 8px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
}

.media-frame__inner {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background:
    linear-gradient(135deg, rgba(216, 208, 194, 0.55), rgba(244, 239, 229, 0.9));
}

.media-frame__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame__cap {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.08em;
  color: var(--mute);
}

.media-frame--tall .media-frame__inner { aspect-ratio: 4 / 5; }
.media-frame--wide .media-frame__inner { aspect-ratio: 21 / 9; }

/* ---------- prose ---------- */
.prose {
  max-width: 72ch;
  line-height: 1.8;
}

.prose > * + * { margin-top: 1.1em; }

.prose a {
  color: var(--rust);
  border-bottom: 1px solid rgba(140, 63, 30, 0.35);
}

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

/* ============================================================
   responsive
   ============================================================ */
@media (min-width: 720px) {
  .footer-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .footer-brand { grid-column: 1 / -1; }
  .footer-contact { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 1079px) {
  .nav-toggle { display: inline-flex; }

  .cmd-nav {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    max-height: min(72vh, 480px);
    overflow-y: auto;
    padding: 6px 0 10px;
    background: var(--card);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 22px 34px -26px rgba(22, 35, 33, 0.6);
  }

  .cmd-nav[data-open] { display: block; }

  .cmd-nav__list {
    flex-direction: column;
    padding: 0 var(--bar-pad);
  }

  .cmd-nav__item + .cmd-nav__item { border-top: 1px solid rgba(216, 208, 194, 0.7); }

  .cmd-nav__link {
    width: 100%;
    padding: 13px 0;
    margin-right: 0;
    font-size: 14.5px;
  }

  .cmd-nav__link::after { display: none; }

  .cmd-nav__link[aria-current="page"] { color: var(--rust); }

  .cmd-nav__link[aria-current="page"] .cmd-nav__idx { color: var(--orange); }

  .cmd-nav__label { white-space: normal; }
}

@media (min-width: 1080px) {
  body { padding-left: var(--rail-w); }

  .skip-link { left: calc(var(--rail-w) + 18px); }

  .brand-rail {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    z-index: 90;
    width: var(--rail-w);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 30px 20px 26px;
    border-right: 1px solid rgba(244, 239, 229, 0.14);
    border-bottom: 0;
    background-color: var(--slate);
    background-image:
      linear-gradient(180deg, rgba(232, 100, 44, 0.2), rgba(232, 100, 44, 0) 34%),
      linear-gradient(0deg, rgba(47, 191, 122, 0.1), rgba(47, 191, 122, 0) 26%);
  }

  .brand-rail__home {
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
  }

  .brand-rail__name {
    writing-mode: vertical-rl;
    font-size: 20px;
    letter-spacing: 0.2em;
    line-height: 1;
    margin-top: 22px;
  }

  .brand-rail__sub {
    writing-mode: vertical-rl;
    margin-top: 12px;
    font-size: 11px;
    letter-spacing: 0.26em;
    line-height: 1;
  }

  .rail-scale {
    display: block;
    flex: 1 1 auto;
    width: 1px;
    min-height: 56px;
    margin: 26px 0 26px 17px;
    background-image: repeating-linear-gradient(
      180deg,
      rgba(244, 239, 229, 0.42) 0 1px,
      transparent 1px 12px
    );
  }

  .rail-meta {
    display: flex;
    flex-direction: column;
    gap: 5px;
    padding-top: 16px;
    border-top: 1px solid rgba(244, 239, 229, 0.16);
    width: 100%;
  }

  .rail-meta__k {
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.24em;
    color: rgba(244, 239, 229, 0.5);
  }

  .rail-meta__v {
    font-size: 15px;
    font-weight: 600;
    letter-spacing: 0.08em;
    color: var(--green);
  }

  .rail-note {
    display: block;
    margin-top: 14px;
    font-size: 11px;
    letter-spacing: 0.12em;
    line-height: 1.7;
    color: rgba(244, 239, 229, 0.55);
  }

  .nav-toggle { display: none; }

  .command-bar__top { padding-block: 8px; }

  .footer-grid { grid-template-columns: 1.5fr 1fr 1fr 1fr; }
  .footer-brand { grid-column: auto; }
  .footer-contact { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (min-width: 1320px) {
  .footer-contact { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

/* ---------- reduced motion ---------- */
@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;
  }

  .btn:hover { transform: none; }
}