/* ==========================================================================
   亚洲城登录 · 结构导航站
   /assets/site.css — 全站共享外壳样式
   框架式页头（横贯条 + 侧边导览轨道）与页脚速查
   ========================================================================== */

/* ---------- 0. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

body,
h1, h2, h3, h4, h5, h6,
p, ul, ol, li, figure, blockquote, dl, dd { margin: 0; }

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

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

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

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

/* ---------- 1. 设计变量 ---------- */
:root {
  /* 矿物色体系 */
  --ink: #0B1F33;
  --ink-2: #123A5C;
  --stone: #C6C1B4;
  --linen: #EFEBE1;
  --paper: #FBFAF7;
  --copper: #C08A3E;
  --copper-lift: #D3A05A;
  --neon: #35E0C8;
  --moss: #5F7A5A;
  --clay: #B5643C;
  --graphite: #1C1F24;
  --muted: #6B675E;

  --line: rgba(198, 193, 180, 0.62);
  --line-soft: rgba(198, 193, 180, 0.34);
  --hair-dark: rgba(198, 193, 180, 0.16);
  --hair-light: rgba(28, 31, 36, 0.12);
  --shadow-soft: 0 1px 2px rgba(0, 0, 0, 0.08);

  /* 字体 */
  --font-title: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, "Courier New", monospace;

  /* 框架尺度 */
  --frame-h: 64px;
  --rail-w: 96px;
  --row: 120ms;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* 栏目色相标签（轨道节点、标签组件共用） */
[data-tone="entry"] { --tone: var(--copper); }
[data-tone="brand"] { --tone: var(--moss); }
[data-tone="notice"] { --tone: var(--clay); }
[data-tone="help"] { --tone: var(--neon); }
[data-tone="plain"] { --tone: var(--stone); }

/* ---------- 2. 中文排版与页面基座 ---------- */
body {
  margin: 0;
  padding-top: var(--frame-h);
  padding-left: var(--rail-w);
  background: var(--linen);
  color: var(--graphite);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
}

h1, h2, h3, h4 {
  font-family: var(--font-title);
  font-weight: 900;
  line-height: 1.24;
  font-stretch: 88%;
  letter-spacing: 0.01em;
  color: var(--graphite);
}

h1 { font-size: clamp(30px, 4.6vw, 46px); }
h2 { font-size: 26px; }
h3 { font-size: 20px; }
h4 { font-size: 16px; }

p { text-wrap: pretty; }

::selection {
  background: rgba(192, 138, 62, 0.28);
  color: var(--ink);
}

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

/* ---------- 3. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 300;
  padding: 10px 18px;
  background: var(--ink);
  color: var(--paper);
  border: 1px solid var(--neon);
  font-size: 14px;
  letter-spacing: 0.08em;
  transform: translateY(-260%);
  transition: transform var(--row) var(--ease);
}

.skip-link:focus { transform: translateY(0); }

/* ---------- 4. 页头 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
}

/* 4.1 横贯框架条 */
.frame-bar {
  position: relative;
  display: flex;
  align-items: center;
  gap: 20px;
  height: var(--frame-h);
  padding: 0 22px;
  background: var(--ink);
  color: var(--linen);
  border-bottom: 1px solid var(--hair-dark);
}

.frame-bar::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 3px;
  background: linear-gradient(
    90deg,
    var(--copper) 0 16.66%,
    var(--moss) 16.66% 33.33%,
    var(--copper) 33.33% 50%,
    var(--clay) 50% 66.66%,
    var(--neon) 66.66% 83.33%,
    var(--stone) 83.33% 100%
  );
  opacity: 0.85;
}

/* 品牌署名 */
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  min-width: 0;
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  flex: 0 0 auto;
  border: 1px solid var(--copper);
  color: var(--copper);
  font-family: var(--font-title);
  font-size: 14px;
  font-weight: 900;
  line-height: 1;
  box-shadow: var(--shadow-soft);
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand__name {
  font-family: var(--font-title);
  font-size: 15px;
  font-weight: 900;
  letter-spacing: 0.08em;
  color: var(--paper);
}

.brand__sub {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: rgba(239, 235, 225, 0.52);
}

/* 公告条 */
.announce {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 1 auto;
  min-width: 0;
  padding: 5px 12px;
  border: 1px solid rgba(192, 138, 62, 0.45);
  background: rgba(192, 138, 62, 0.08);
  color: rgba(239, 235, 225, 0.86);
  font-size: 13px;
  line-height: 1.5;
  transition: border-color var(--row) var(--ease), background var(--row) var(--ease), color var(--row) var(--ease);
}

.announce:hover,
.announce:focus-visible {
  border-color: var(--copper);
  background: rgba(192, 138, 62, 0.18);
  color: var(--paper);
}

.announce__tag {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--copper);
}

.announce__text {
  min-width: 0;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.announce__arrow {
  flex: none;
  color: var(--copper);
  font-size: 13px;
}

/* 4.2 通用按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 16px;
  border: 1px solid transparent;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: color var(--row) var(--ease), border-color var(--row) var(--ease), background var(--row) var(--ease);
}

.btn--ghost {
  border-color: rgba(198, 193, 180, 0.42);
  color: var(--linen);
  background: transparent;
}

.btn--ghost:hover,
.btn--ghost:focus-visible {
  border-color: var(--copper);
  color: var(--copper);
}

.btn--solid {
  border-color: var(--copper);
  background: var(--copper);
  color: #14100A;
}

.btn--solid:hover,
.btn--solid:focus-visible {
  background: var(--copper-lift);
  border-color: var(--copper-lift);
}

.frame-bar__cta {
  flex: none;
  margin-left: auto;
}

/* 4.3 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  flex: none;
  margin-left: auto;
  padding: 8px 12px;
  border: 1px solid rgba(198, 193, 180, 0.42);
  color: var(--linen);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  cursor: pointer;
  transition: border-color var(--row) var(--ease), color var(--row) var(--ease);
}

.nav-toggle:hover,
.nav-toggle:focus-visible { border-color: var(--copper); color: var(--copper); }

.nav-toggle[aria-expanded="true"] {
  border-color: var(--neon);
  color: var(--neon);
}

.nav-toggle__icon {
  position: relative;
  width: 14px;
  height: 10px;
  flex: none;
  border-top: 1px solid currentColor;
  border-bottom: 1px solid currentColor;
}

.nav-toggle__icon::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 4px;
  height: 1px;
  background: currentColor;
}

/* 4.4 侧边导览轨道 */
.rail {
  position: fixed;
  top: var(--frame-h);
  left: 0;
  bottom: 0;
  width: var(--rail-w);
  display: flex;
  flex-direction: column;
  padding: 14px 0 14px;
  background: var(--ink);
  border-right: 1px solid var(--hair-dark);
}

.rail__nav { flex: 1 1 auto; min-height: 0; }

.rail__list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.rail__item { display: block; }

.rail__node {
  position: relative;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 8px 10px 16px;
  color: rgba(239, 235, 225, 0.7);
  font-size: 12.5px;
  line-height: 1.3;
  letter-spacing: 0.02em;
  transition: color var(--row) var(--ease), background var(--row) var(--ease);
}

.rail__node::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 3px;
  background: var(--tone, var(--stone));
  opacity: 0.55;
  transition: width var(--row) var(--ease), opacity var(--row) var(--ease), background var(--row) var(--ease);
}

.rail__node:hover,
.rail__node:focus-visible {
  color: var(--paper);
  background: rgba(255, 255, 255, 0.05);
}

.rail__node:hover::before,
.rail__node:focus-visible::before { width: 5px; opacity: 1; }

.rail__node[aria-current="page"] {
  color: var(--copper);
  font-weight: 700;
  background: rgba(192, 138, 62, 0.1);
}

.rail__node[aria-current="page"]::before {
  width: 5px;
  opacity: 1;
  background: var(--copper);
}

.rail__mark {
  width: 5px;
  height: 5px;
  flex: none;
  background: var(--tone, var(--stone));
  opacity: 0.7;
}

.rail__label { min-width: 0; }

/* 悬停浮出的落点说明 */
.rail__node::after {
  content: attr(data-hint);
  position: absolute;
  left: calc(100% + 12px);
  top: 50%;
  transform: translate(-6px, -50%);
  z-index: 30;
  padding: 6px 10px;
  background: var(--ink-2);
  border: 1px solid rgba(53, 224, 200, 0.42);
  color: var(--linen);
  font-family: var(--font-body);
  font-size: 12px;
  line-height: 1.4;
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--row) var(--ease), transform var(--row) var(--ease), visibility var(--row) var(--ease);
}

@media (hover: hover) {
  .rail__node:hover::after {
    opacity: 1;
    visibility: visible;
    transform: translate(0, -50%);
  }
}

.rail__node:focus-visible::after {
  opacity: 1;
  visibility: visible;
  transform: translate(0, -50%);
}

.rail__meta {
  display: flex;
  align-items: center;
  gap: 7px;
  margin-top: auto;
  padding: 12px 12px 0;
  border-top: 1px solid var(--hair-dark);
}

.rail__pulse {
  width: 6px;
  height: 6px;
  flex: none;
  background: var(--neon);
  box-shadow: 0 0 0 3px rgba(53, 224, 200, 0.16);
}

.rail__meta-text {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  line-height: 1.5;
  color: rgba(239, 235, 225, 0.5);
}

.rail__progress {
  position: absolute;
  right: -1px;
  top: 0;
  width: 2px;
  height: 100%;
  background: var(--neon);
  transform: scaleY(0);
  transform-origin: top center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 200ms var(--ease);
}

/* ---------- 5. 页脚 ---------- */
.site-footer {
  background: var(--ink);
  color: var(--linen);
  border-top: 1px solid var(--hair-dark);
  padding: 52px 0 0;
}

.footer__inner {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
}

.footer__grid {
  display: grid;
  grid-template-columns: minmax(180px, 1fr) minmax(0, 1.75fr) minmax(220px, 1fr);
  gap: 36px 48px;
  padding-bottom: 38px;
}

.footer__col { min-width: 0; }

.footer__brand {
  font-family: var(--font-title);
  font-size: 22px;
  font-weight: 900;
  letter-spacing: 0.08em;
  color: var(--paper);
}

.footer__tag {
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(239, 235, 225, 0.6);
}

.footer__nav { margin-top: 18px; }

.footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
}

.footer__links a {
  font-size: 13px;
  color: rgba(239, 235, 225, 0.78);
  padding-bottom: 2px;
  border-bottom: 1px solid rgba(198, 193, 180, 0.3);
  transition: color var(--row) var(--ease), border-color var(--row) var(--ease);
}

.footer__links a:hover,
.footer__links a:focus-visible {
  color: var(--copper);
  border-color: var(--copper);
}

.footer__title {
  font-family: var(--font-title);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--stone);
  margin-bottom: 14px;
}

/* 服务范围速查 */
.quicklist {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 4px 20px;
  max-height: 58px;
  overflow: hidden;
  transition: max-height 240ms var(--ease);
}

.quicklist[data-open] { max-height: 420px; }

.quicklist li {
  position: relative;
  padding-left: 14px;
  font-size: 13px;
  line-height: 1.9;
  color: rgba(239, 235, 225, 0.72);
}

.quicklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 6px;
  height: 1px;
  background: var(--stone);
  opacity: 0.7;
}

.quicklist__toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 14px;
  padding: 7px 12px;
  border: 1px solid rgba(198, 193, 180, 0.35);
  color: var(--linen);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  cursor: pointer;
  transition: border-color var(--row) var(--ease), color var(--row) var(--ease);
}

.quicklist__toggle:hover,
.quicklist__toggle:focus-visible {
  border-color: var(--copper);
  color: var(--copper);
}

.quicklist__toggle::after {
  content: "↓";
  font-size: 11px;
  line-height: 1;
}

.quicklist__toggle[aria-expanded="true"]::after { content: "↑"; }

/* 联系与备案 */
.contact-list {
  display: grid;
  gap: 8px;
}

.contact-list li {
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.7;
  color: rgba(239, 235, 225, 0.82);
  word-break: break-word;
}

.contact-list__key {
  display: inline-block;
  min-width: 40px;
  color: var(--stone);
  letter-spacing: 0.08em;
}

.footer__icp {
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--stone);
}

.footer__note {
  margin-top: 10px;
  max-width: 34ch;
  font-size: 11.5px;
  line-height: 1.75;
  color: rgba(239, 235, 225, 0.42);
}

.footer__base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 24px;
  padding: 16px 0 22px;
  border-top: 1px solid var(--hair-dark);
}

.footer__base p {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.03em;
  color: rgba(239, 235, 225, 0.5);
}

/* ---------- 6. 内容容器与基础组件 ---------- */
.container {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
}

.container--narrow { max-width: 760px; }

.prose {
  max-width: 660px;
  font-size: 16px;
  line-height: 1.75;
  color: var(--graphite);
}

.prose p + p { margin-top: 1em; }

.prose a {
  color: #8A5C1F;
  border-bottom: 1px solid rgba(138, 92, 31, 0.4);
}

.prose a:hover { border-color: #8A5C1F; }

.breadcrumb { margin: 26px 0 0; }

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 10px;
  font-size: 12.5px;
  color: var(--muted);
}

.breadcrumb__item { display: inline-flex; align-items: center; }

.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 10px;
  color: var(--stone);
}

.breadcrumb a {
  color: var(--muted);
  border-bottom: 1px solid var(--line);
}

.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  color: var(--copper);
  border-color: var(--copper);
}

.section {
  padding: 56px 0;
  border-top: 1px solid var(--line-soft);
}

.section--tight { padding: 32px 0; }

.section-title {
  font-size: 26px;
  margin-bottom: 18px;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--copper);
  margin-bottom: 12px;
}

.lede {
  max-width: 46ch;
  font-size: 18px;
  line-height: 1.7;
  color: #3B3A35;
}

.note {
  padding: 4px 0 4px 16px;
  border-left: 2px solid var(--copper);
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.divider {
  height: 1px;
  border: 0;
  margin: 0;
  background: var(--line);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border: 1px solid currentColor;
  color: var(--tone, var(--copper));
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  line-height: 1.6;
}

.grid {
  display: grid;
  gap: 24px;
}

.grid--index {
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.grid--index > * {
  background: var(--paper);
  padding: 18px 20px;
}

.grid--split {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 32px;
}

.grid--split > .grid__main { grid-column: 1 / span 7; }
.grid--split > .grid__aside { grid-column: 9 / span 4; }

/* 响应式图片容器（页面阶段在其中放置 <img>） */
.media {
  position: relative;
  overflow: hidden;
  background: var(--ink-2);
  border: 1px solid var(--line-soft);
  box-shadow: var(--shadow-soft);
}

.media__frame {
  position: relative;
  aspect-ratio: 16 / 9;
  background:
    linear-gradient(135deg, rgba(53, 224, 200, 0.08), rgba(11, 31, 51, 0) 60%),
    var(--ink-2);
}

.media__frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media--wide .media__frame { aspect-ratio: 21 / 9; }
.media--square .media__frame { aspect-ratio: 1 / 1; }
.media--portrait .media__frame { aspect-ratio: 3 / 4; }

.media__cap {
  margin-top: 8px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--muted);
}

/* 进场显现（无 JS 时默认可见） */
.reveal { transition: opacity 260ms var(--ease), transform 260ms var(--ease); }

html.js .reveal:not(.is-visible) {
  opacity: 0;
  transform: translateY(4px);
}

/* ---------- 7. 响应式 ---------- */
@media (max-width: 1023px) {
  :root {
    --frame-h: 56px;
    --rail-w: 0px;
  }

  body { padding-left: 0; }

  .frame-bar { gap: 12px; padding: 0 14px; }

  .announce { padding: 4px 9px; font-size: 12px; }
  .announce__arrow { display: none; }
  .frame-bar__cta { display: none; }

  .nav-toggle { display: inline-flex; }

  .rail {
    top: var(--frame-h);
    left: 0;
    right: 0;
    bottom: auto;
    width: auto;
    padding: 0;
    background: transparent;
    border-right: 0;
    pointer-events: none;
  }

  .rail__meta { display: none; }
  .rail__progress { display: none; }

  .rail__nav {
    position: fixed;
    top: var(--frame-h);
    left: 0;
    right: 0;
    max-height: calc(100vh - var(--frame-h));
    overflow-y: auto;
    padding: 10px 14px 18px;
    background: var(--ink);
    border-bottom: 1px solid var(--hair-dark);
    box-shadow: var(--shadow-soft);
    pointer-events: auto;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity var(--row) var(--ease), transform var(--row) var(--ease), visibility var(--row) var(--ease);
  }

  .rail__nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .rail__list { gap: 1px; }

  .rail__node {
    padding: 12px 10px 12px 16px;
    font-size: 14px;
    border-bottom: 1px solid rgba(198, 193, 180, 0.1);
  }

  .rail__node::before { top: 10px; bottom: 10px; }
  .rail__node::after { display: none; }

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

  .grid--split { grid-template-columns: minmax(0, 1fr); gap: 24px; }
  .grid--split > .grid__main,
  .grid--split > .grid__aside { grid-column: 1 / -1; }
}

@media (max-width: 767px) {
  body { font-size: 15.5px; }

  .brand__sub { display: none; }
  .announce { max-width: 58%; }

  .footer__grid { grid-template-columns: minmax(0, 1fr); gap: 30px; }

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

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

  .section { padding: 40px 0; }
}

@media (max-width: 479px) {
  .announce__tag { display: none; }
  .brand__name { font-size: 14px; letter-spacing: 0.04em; }
  .container,
  .footer__inner { padding: 0 16px; }
}

/* ---------- 8. 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 1ms !important;
  }

  html.js .reveal:not(.is-visible) {
    opacity: 1;
    transform: none;
  }

  .skip-link { transform: none; clip-path: inset(50%); }
  .skip-link:focus { clip-path: none; }
}