/* ==========================================================================
   /assets/site.css — 皇冠登录 WELCOME 中国站 共享样式
   ========================================================================== */

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

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

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

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

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

button { font: inherit; color: inherit; background: none; border: 0; }

a { color: inherit; }

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

/* ---------- tokens ---------- */
:root {
  --ink: #0B0C0E;
  --ink-2: #14161A;
  --ink-3: #1C2026;
  --gold: #C9A24B;
  --gold-hi: #E8C876;
  --crimson: #6E1F26;
  --silver: #B9BEC6;
  --sand: #F2EDE4;
  --paper: #D9D4CB;
  --slate: #2A3138;
  --seal: #3F6B5A;

  --line: rgba(185, 190, 198, .16);
  --line-gold: rgba(201, 162, 75, .28);
  --muted: rgba(185, 190, 198, .66);

  --font-serif: "Source Han Serif SC", "Noto Serif SC", "Songti SC", "SimSun", serif;
  --font-sans: "HarmonyOS Sans SC", "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "Sarasa Mono SC", "Cascadia Mono", ui-monospace, Menlo, Consolas, monospace;

  --shell: 1240px;
  --cut: 18px;
  --dur: .2s;
}

/* ---------- base ---------- */
body {
  min-height: 100vh;
  background: var(--ink);
  color: var(--silver);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.85;
  letter-spacing: .01em;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

#main-content { display: block; }

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 800;
  color: var(--sand);
  line-height: 1.3;
  letter-spacing: .02em;
}
h1 { font-size: clamp(34px, 5.2vw, 64px); }
h2 { font-size: clamp(26px, 3.2vw, 40px); }
h3 { font-size: clamp(20px, 2.1vw, 26px); }
h4 { font-size: 18px; }

p { color: var(--silver); }

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

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

/* ---------- 等宽索引元素 ---------- */
.mono,
.part-no,
.stamp,
.breadcrumb,
.plate-tag,
.footer-title {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .08em;
}

.part-no {
  display: block;
  color: var(--gold);
  font-size: 13px;
  letter-spacing: .18em;
  margin-bottom: 10px;
}

.stamp {
  display: inline-block;
  color: var(--muted);
  font-size: 12.5px;
  letter-spacing: .12em;
}

/* ---------- skip link ---------- */
.skip-link {
  position: fixed;
  top: -72px;
  left: 20px;
  z-index: 90;
  padding: 10px 20px;
  background: var(--gold);
  color: var(--ink);
  font-weight: 700;
  font-size: 14px;
  text-decoration: none;
  border-radius: 0 0 10px 10px;
  transition: top var(--dur) ease;
}
.skip-link:focus { top: 0; }

/* ==========================================================================
   header
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  padding: 14px 20px 0;
  transition: padding var(--dur) ease;
}
.site-header.is-condensed { padding-top: 8px; }

.header-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  z-index: 70;
  background: linear-gradient(90deg, var(--gold), var(--gold-hi) 60%, var(--crimson));
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
}

.header-shell {
  position: relative;
  display: flex;
  align-items: center;
  gap: 18px;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 9px 12px 9px 18px;
  background: rgba(20, 22, 26, .86);
  border: 1px solid var(--line-gold);
  border-radius: 999px;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  transition: padding var(--dur) ease, background-color var(--dur) ease, border-color var(--dur) ease;
}
.site-header.is-condensed .header-shell {
  padding: 5px 10px 5px 16px;
  background: rgba(11, 12, 14, .95);
  border-color: rgba(201, 162, 75, .38);
}

/* brand */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  text-decoration: none;
  flex: 0 0 auto;
}
.brand-sigil,
.footer-sigil {
  width: 26px;
  height: 26px;
  flex: 0 0 26px;
  background: linear-gradient(155deg, var(--gold-hi), var(--gold) 52%, #8B6F27);
  clip-path: polygon(0 24%, 17% 48%, 32% 0, 50% 36%, 68% 0, 83% 48%, 100% 24%, 88% 100%, 12% 100%);
}
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-name {
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: 19px;
  color: var(--sand);
  letter-spacing: .06em;
}
.brand-sub {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .22em;
  color: var(--gold);
}

.brand-tag {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--muted);
  padding-left: 18px;
  border-left: 1px solid var(--line);
  white-space: nowrap;
  flex: 0 1 auto;
}

/* nav capsule */
.nav-capsule { margin-left: auto; }
.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 4px;
  background: rgba(42, 49, 56, .55);
  border: 1px solid rgba(185, 190, 198, .12);
  border-radius: 999px;
}
.nav-link {
  display: block;
  padding: 8px 14px;
  font-size: 14.5px;
  color: var(--silver);
  text-decoration: none;
  border-radius: 999px;
  white-space: nowrap;
  transition: color var(--dur) ease, background-color var(--dur) ease, box-shadow var(--dur) ease;
}
.nav-link:hover {
  color: var(--gold-hi);
  background: rgba(201, 162, 75, .12);
}
.nav-link[aria-current="page"] {
  color: var(--gold-hi);
  background: linear-gradient(180deg, rgba(201, 162, 75, .24), rgba(201, 162, 75, .08));
  box-shadow: inset 0 0 0 1px rgba(201, 162, 75, .5);
}

/* header cta */
.header-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  background: var(--gold);
  border-radius: 999px;
  text-decoration: none;
  white-space: nowrap;
  flex: 0 0 auto;
  transition: background-color var(--dur) ease;
}
.header-cta:hover { background: var(--gold-hi); }
.header-cta .cta-arrow { transition: transform var(--dur) ease; }
.header-cta:hover .cta-arrow { transform: translateX(4px); }

/* mobile toggle */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 15px;
  color: var(--gold);
  border: 1px solid rgba(185, 190, 198, .28);
  border-radius: 999px;
  cursor: pointer;
  flex: 0 0 auto;
  transition: border-color var(--dur) ease, color var(--dur) ease;
}
.nav-toggle::before {
  content: "";
  width: 16px;
  height: 2px;
  background: currentColor;
  box-shadow: 0 -5px 0 currentColor, 0 5px 0 currentColor;
}
.nav-toggle:hover { border-color: var(--gold); color: var(--gold-hi); }
.nav-toggle-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
}

/* ==========================================================================
   footer
   ========================================================================== */
.site-footer {
  position: relative;
  margin-top: 96px;
  background: var(--ink-2);
  border-top: 1px solid var(--line-gold);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(201, 162, 75, .55), transparent);
}

.footer-shell {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 2fr);
  gap: 48px;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 56px 20px 40px;
}

.footer-brand { display: flex; flex-direction: column; gap: 6px; }
.footer-sigil { width: 30px; height: 30px; margin-bottom: 10px; }
.footer-name {
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: 22px;
  color: var(--sand);
  letter-spacing: .06em;
}
.footer-sub {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--gold);
  margin-bottom: 14px;
}
.footer-line {
  font-size: 13.5px;
  line-height: 1.9;
  color: var(--muted);
  word-break: break-all;
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px;
}
.footer-title {
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--gold);
  margin-bottom: 16px;
}
.footer-links li { margin-bottom: 4px; }
.footer-links a {
  display: inline-block;
  padding: 4px 0;
  font-size: 15px;
  color: var(--silver);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) ease, border-color var(--dur) ease;
}
.footer-links a:hover {
  color: var(--gold-hi);
  border-bottom-color: var(--gold);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 26px;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 20px 20px 42px;
  border-top: 1px solid var(--line);
}
.footer-legal-line {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: rgba(185, 190, 198, .58);
}

/* ==========================================================================
   layout scaffolding
   ========================================================================== */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 20px;
}
.shell--narrow { max-width: 900px; }

.page-shell {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 48px;
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 48px 20px 0;
}
.page-rail { position: relative; }
.page-canvas { min-width: 0; }

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 24px;
}

/* ---------- rail ---------- */
.rail { position: sticky; top: 110px; }
.rail-title {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .2em;
  color: var(--muted);
  margin-bottom: 20px;
}
.rail-list { border-left: 1px solid var(--line); }
.rail-node {
  position: relative;
  display: block;
  padding: 0 0 22px 18px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted);
  text-decoration: none;
  transition: color var(--dur) ease;
}
.rail-node::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 8px;
  width: 7px;
  height: 7px;
  background: var(--slate);
  transform: rotate(45deg);
  transition: background-color var(--dur) ease;
}
.rail-node:hover { color: var(--sand); }
.rail-node:hover::before { background: var(--gold); }
.rail-node[data-current="true"] { color: var(--gold-hi); }
.rail-node[data-current="true"]::before { background: var(--gold-hi); }

/* ==========================================================================
   components
   ========================================================================== */
.prose { max-width: 68ch; }
.prose h2 { margin-bottom: 18px; }
.prose h3 { margin: 36px 0 12px; }
.prose p { margin-bottom: 20px; }
.prose strong { color: var(--sand); }
.prose a {
  color: var(--gold-hi);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: 1px;
}
.prose a:hover { color: var(--gold); }
.prose ul { margin: 0 0 22px; }
.prose li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 8px;
}
.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .82em;
  width: 7px;
  height: 1px;
  background: var(--gold);
}

.band-sand {
  background: var(--sand);
  color: #232830;
  padding: 64px 0;
}
.band-sand h1, .band-sand h2, .band-sand h3 { color: var(--ink-2); }
.band-sand p, .band-sand li { color: #3B434D; }
.band-sand a { color: var(--crimson); }
.band-sand .part-no { color: var(--crimson); }
.band-sand .stamp { color: rgba(59, 67, 77, .7); }

.band-ink {
  background: var(--ink-2);
  padding: 64px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.plate-tag {
  display: inline-flex;
  align-items: center;
  padding: 5px 16px 5px 12px;
  font-size: 11.5px;
  letter-spacing: .18em;
  color: var(--sand);
  background: var(--crimson);
  clip-path: polygon(0 0, 100% 0, calc(100% - 12px) 100%, 0 100%);
}

.panel-cut {
  position: relative;
  padding: 28px 32px;
  background: var(--ink-2);
  border: 1px solid var(--line-gold);
  clip-path: polygon(var(--cut) 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%, 0 var(--cut));
}
.band-sand .panel-cut {
  background: var(--paper);
  border-color: rgba(110, 31, 38, .22);
}

.divider-rule {
  height: 1px;
  border: 0;
  margin: 48px 0;
  background: linear-gradient(90deg, var(--line-gold), transparent 78%);
}

/* buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 26px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .03em;
  text-decoration: none;
  border-radius: 2px;
  transition: background-color var(--dur) ease, color var(--dur) ease, border-color var(--dur) ease;
}
.btn-gold { background: var(--gold); color: var(--ink); }
.btn-gold:hover { background: var(--gold-hi); }
.btn-ghost {
  color: var(--sand);
  border: 1px solid rgba(185, 190, 198, .34);
}
.btn-ghost:hover {
  color: var(--gold-hi);
  border-color: var(--gold);
  background: rgba(201, 162, 75, .08);
}
.btn-arrow { transition: transform var(--dur) ease; }
.btn:hover .btn-arrow { transform: translateX(4px); }

/* breadcrumb */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 12.5px;
  color: var(--muted);
  margin-bottom: 28px;
}
.breadcrumb a {
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) ease, border-color var(--dur) ease;
}
.breadcrumb a:hover { color: var(--gold-hi); border-bottom-color: var(--gold); }
.breadcrumb span[aria-hidden="true"] { color: rgba(185, 190, 198, .38); }

/* media frames */
.media-frame {
  position: relative;
  overflow: hidden;
  width: 100%;
  aspect-ratio: 16 / 10;
  background: var(--slate);
  border: 1px solid var(--line);
}
.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.86) contrast(1.04);
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--portrait { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--paper {
  background:
    repeating-linear-gradient(0deg, rgba(0, 0, 0, .04) 0 1px, transparent 1px 4px),
    radial-gradient(120% 100% at 30% 10%, #E4DFD5, var(--paper));
  border-color: rgba(110, 31, 38, .2);
}

/* ---------- reveal ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .5s ease, transform .5s cubic-bezier(.22, .7, .3, 1);
}
[data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ==========================================================================
   responsive
   ========================================================================== */
@media (max-width: 1180px) {
  .brand-tag { display: none; }
}

@media (max-width: 1024px) {
  .page-shell {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
    padding-top: 32px;
  }
  .page-rail { margin-bottom: 28px; }
  .rail { position: static; }
  .rail-list { display: flex; flex-wrap: wrap; border-left: 0; }
  .rail-node { padding: 6px 16px 6px 18px; }
}

@media (max-width: 920px) {
  .site-header { padding: 10px 12px 0; }
  .header-shell { padding: 8px 10px 8px 14px; gap: 10px; }
  .nav-toggle { display: inline-flex; }
  .header-cta { display: none; }

  .nav-capsule {
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    right: 0;
    margin: 0;
    padding: 12px;
    background: rgba(11, 12, 14, .98);
    border: 1px solid var(--line-gold);
    border-radius: 18px;
    max-height: calc(100vh - 130px);
    overflow-y: auto;
    display: none;
  }
  .nav-capsule[data-open] { display: block; }
  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 0;
    background: none;
    border: 0;
    border-radius: 0;
  }
  .nav-link {
    padding: 12px 14px;
    font-size: 16px;
    border-radius: 10px;
  }
  .nav-link[aria-current="page"] {
    background: rgba(201, 162, 75, .14);
    box-shadow: inset 2px 0 0 var(--gold);
  }

  .footer-shell {
    grid-template-columns: minmax(0, 1fr);
    gap: 36px;
    padding: 44px 20px 28px;
  }
}

@media (max-width: 680px) {
  body { font-size: 16px; }
  .brand-sub { letter-spacing: .16em; }
  .footer-cols { grid-template-columns: minmax(0, 1fr); gap: 24px; }
  .footer-legal { padding: 18px 20px 36px; }
  .panel-cut { padding: 22px 20px; }
  .band-sand, .band-ink { padding: 44px 0; }
  .site-footer { margin-top: 64px; }
}

/* ==========================================================================
   reduced motion
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    transition-duration: .001ms !important;
  }
  [data-reveal] {
    opacity: 1;
    transform: none;
  }
  .header-progress { transition: none; }
  .header-cta:hover .cta-arrow,
  .btn:hover .btn-arrow { transform: none; }
}