/* ==========================================================================
   九博国际会馆 · 共享样式表 /assets/site.css
   视觉母题：午夜档案室 × 品牌会馆
   ========================================================================== */

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

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

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

ul, ol { margin: 0; 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; }

/* ---------- 2. 设计变量 ---------- */
:root {
  /* 色彩 */
  --c-ink: #0A1826;
  --c-indigo: #132743;
  --c-jade: #0E3532;
  --c-wine: #5C1F2B;
  --c-gold: #C8A44A;
  --c-gold-soft: #DDBD6A;
  --c-coral: #E4703F;
  --c-celadon: #6FB0A2;
  --c-paper: #F3EDE1;
  --c-inkblack: #1B2432;
  --c-mist: #A9B7C6;

  /* 边界 */
  --line-gold: rgba(200, 164, 74, 0.26);
  --line-gold-strong: rgba(200, 164, 74, 0.55);
  --line-mist: rgba(169, 183, 198, 0.18);
  --line-celadon: rgba(111, 176, 162, 0.34);
  --line-coral: rgba(228, 112, 63, 0.45);

  /* 字体 */
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", Georgia, serif;
  --font-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, "Courier New", monospace;

  /* 尺度 */
  --w-max: 1320px;
  --pad-x: clamp(16px, 4vw, 40px);
  --stack: clamp(16px, 2.4vw, 28px);
  --radius-cut: 28px;

  /* 动效 */
  --ease-out: cubic-bezier(0.22, 0.72, 0.28, 1);
  --t-fast: 160ms;
  --t-mid: 240ms;
}

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100vh;
  background-color: var(--c-ink);
  background-image:
    radial-gradient(1200px 620px at 84% -10%, rgba(19, 39, 67, 0.92), transparent 70%),
    radial-gradient(900px 520px at 2% 14%, rgba(14, 53, 50, 0.55), transparent 68%),
    linear-gradient(180deg, #0A1826 0%, #0B1B2B 60%, #0A1826 100%);
  color: var(--c-paper);
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.85;
  letter-spacing: 0.005em;
}

@media (min-width: 1025px) {
  body { background-attachment: fixed; }
}

h1, h2, h3, h4, h5 {
  font-family: var(--font-serif);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--c-paper);
}

h1 { font-size: clamp(30px, 4.4vw, 40px); }
h2 { font-size: clamp(24px, 3vw, 30px); }
h3 { font-size: 22px; font-weight: 600; }
h4 { font-size: 18px; font-weight: 600; }

p { margin-bottom: 1em; }
p:last-child { margin-bottom: 0; }

strong { font-weight: 600; color: var(--c-paper); }

::selection {
  background: rgba(200, 164, 74, 0.3);
  color: var(--c-paper);
}

:focus-visible {
  outline: 2px solid var(--c-coral);
  outline-offset: 3px;
}

/* ---------- 4. 容器与栅格 ---------- */
.container {
  width: 100%;
  max-width: var(--w-max);
  margin-inline: auto;
  padding-inline: var(--pad-x);
}

.grid { display: grid; gap: var(--stack); }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

@media (max-width: 900px) {
  .grid-2,
  .grid-3 { grid-template-columns: minmax(0, 1fr); }
}

.prose { max-width: 68ch; color: var(--c-paper); }

/* ---------- 5. 跳过链接 ---------- */
.skip-link {
  position: absolute;
  top: -80px;
  left: 18px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--c-gold);
  color: var(--c-ink);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.06em;
  transition: top var(--t-fast) var(--ease-out);
}

.skip-link:focus,
.skip-link:focus-visible {
  top: 10px;
  outline-color: var(--c-paper);
}

/* ---------- 6. 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background-color: var(--c-ink);
  border-bottom: 1px solid var(--line-gold);
}

.header-slab {
  background-image: linear-gradient(180deg, #102438 0%, #0C1D2E 100%);
  border-bottom: 1px solid var(--line-gold);
}

.header-utility {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  padding-block: 13px;
}

.brand-block { display: grid; gap: 2px; }

.brand-mark {
  font-family: var(--font-serif);
  font-size: 21px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--c-paper);
}

.brand-domain {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--c-celadon);
}

.status-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.status-chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 4px 11px 4px 9px;
  background-color: rgba(14, 53, 50, 0.62);
  border: 1px solid var(--line-celadon);
  color: var(--c-celadon);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  line-height: 1.5;
  letter-spacing: 0.04em;
  white-space: nowrap;
  clip-path: polygon(7px 0, 100% 0, 100% calc(100% - 7px), calc(100% - 7px) 100%, 0 100%, 0 7px);
}

.chip-dot {
  flex: none;
  width: 6px;
  height: 6px;
  background: var(--c-gold);
  transform: rotate(45deg);
}

/* 命令栏 */
.command-bar { background-color: var(--c-ink); }

.command-inner {
  display: flex;
  align-items: stretch;
  gap: 14px;
  min-height: 60px;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  align-self: center;
  padding: 9px 14px;
  background: rgba(200, 164, 74, 0.07);
  border: 1px solid var(--line-gold-strong);
  color: var(--c-gold);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.08em;
  cursor: pointer;
  clip-path: polygon(9px 0, 100% 0, 100% calc(100% - 9px), calc(100% - 9px) 100%, 0 100%, 0 9px);
  transition: background-color var(--t-fast) var(--ease-out), border-color var(--t-fast) var(--ease-out);
}

.nav-toggle:hover { background: rgba(200, 164, 74, 0.14); }

.nav-toggle-bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
}

.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: currentColor;
  transition: transform var(--t-fast) var(--ease-out);
}

.nav-toggle-bars::before { top: -5px; }
.nav-toggle-bars::after { top: 5px; }

.nav-toggle[aria-expanded="true"] .nav-toggle-bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after { transform: translateY(-5px) rotate(-45deg); }

.command-nav {
  display: flex;
  flex: 1 1 auto;
  min-width: 0;
}

.nav-list {
  display: flex;
  flex: 1 1 auto;
  align-items: stretch;
  gap: 2px;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 60px;
  padding: 0 14px;
  color: var(--c-mist);
  font-size: 14px;
  line-height: 1.4;
  white-space: nowrap;
  border-top: 2px solid transparent;
  border-bottom: 2px solid transparent;
  transition:
    color var(--t-fast) var(--ease-out),
    background-color var(--t-fast) var(--ease-out),
    border-color var(--t-fast) var(--ease-out);
}

.nav-link:hover {
  color: var(--c-paper);
  background-color: rgba(200, 164, 74, 0.06);
  border-bottom-color: var(--line-gold-strong);
}

.nav-link[aria-current="page"] {
  color: var(--c-paper);
  background-color: rgba(200, 164, 74, 0.09);
  border-bottom-color: var(--c-gold);
}

.nav-index {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--c-gold);
  opacity: 0.62;
  transition: opacity var(--t-fast) var(--ease-out);
}

.nav-link:hover .nav-index,
.nav-link[aria-current="page"] .nav-index { opacity: 1; }

.header-cta-group {
  display: flex;
  flex: none;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}

/* ---------- 7. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 16px;
  border: 1px solid transparent;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  line-height: 1;
  letter-spacing: 0.08em;
  white-space: nowrap;
  cursor: pointer;
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
  transition:
    background-color var(--t-fast) var(--ease-out),
    border-color var(--t-fast) var(--ease-out),
    color var(--t-fast) var(--ease-out);
}

.btn-gold {
  background-color: var(--c-gold);
  color: #14202C;
}

.btn-gold:hover { background-color: var(--c-gold-soft); }

.btn-ghost {
  background-color: rgba(200, 164, 74, 0.06);
  border-color: var(--line-gold-strong);
  color: var(--c-gold);
}

.btn-ghost:hover {
  background-color: rgba(200, 164, 74, 0.15);
  border-color: var(--c-gold);
}

/* 滚动进度 */
.scroll-progress {
  height: 2px;
  background-color: rgba(200, 164, 74, 0.12);
}

.scroll-progress-bar {
  display: block;
  width: 100%;
  height: 100%;
  background-image: linear-gradient(90deg, var(--c-gold) 0%, var(--c-coral) 100%);
  transform: scaleX(0);
  transform-origin: left center;
  will-change: transform;
}

/* ---------- 8. 页脚 ---------- */
.site-footer {
  margin-top: clamp(48px, 7vw, 96px);
  background-image: linear-gradient(180deg, #0E1C2C 0%, #08131F 100%);
  border-top: 1px solid var(--line-gold);
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1.9fr) minmax(0, 1.25fr);
  gap: clamp(24px, 3.4vw, 52px);
  padding-block: clamp(36px, 5vw, 64px) clamp(24px, 3vw, 44px);
}

.footer-mark {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--c-paper);
}

.footer-domain {
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--c-celadon);
}

.footer-summary {
  margin-top: 14px;
  max-width: 34ch;
  color: var(--c-mist);
  font-size: 14px;
  line-height: 1.8;
}

.footer-status {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

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

.footer-group-title {
  margin-bottom: 12px;
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--c-gold);
}

.footer-links { display: grid; gap: 8px; }

.footer-links a {
  display: inline-block;
  color: var(--c-mist);
  font-size: 14px;
  line-height: 1.7;
  transition: color var(--t-fast) var(--ease-out), transform var(--t-fast) var(--ease-out);
}

.footer-links a:hover {
  color: var(--c-paper);
  transform: translateX(3px);
}

.contact-list { display: grid; gap: 13px; }

.contact-item { display: grid; gap: 3px; }

.contact-label {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--c-celadon);
}

.contact-value {
  color: var(--c-paper);
  font-size: 14px;
  line-height: 1.7;
  word-break: break-word;
}

.contact-note {
  margin-top: 16px;
  padding-left: 12px;
  border-left: 2px solid var(--line-gold);
  color: var(--c-mist);
  font-size: 13px;
  line-height: 1.75;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 24px;
  padding-block: 18px 28px;
  border-top: 1px solid var(--line-mist);
  color: var(--c-mist);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.04em;
}

.legal-copy { margin: 0; }

.icp-line { color: var(--c-celadon); }

/* ---------- 9. 通用内容组件 ---------- */
.breadcrumbs { padding-top: 20px; }

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--c-mist);
}

.breadcrumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(200, 164, 74, 0.55);
}

.breadcrumbs a { transition: color var(--t-fast) var(--ease-out); }
.breadcrumbs a:hover { color: var(--c-gold); }
.breadcrumbs [aria-current="page"] { color: var(--c-paper); }

.section { padding-block: clamp(40px, 6vw, 84px); }
.section--tight { padding-block: clamp(24px, 3vw, 46px); }

.section-head {
  display: grid;
  gap: 10px;
  max-width: 78ch;
  margin-bottom: clamp(20px, 3vw, 34px);
}

.section-index {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--c-gold);
}

.section-title { color: var(--c-paper); }

.section-lead {
  max-width: 62ch;
  color: var(--c-mist);
  font-size: 15px;
  line-height: 1.85;
}

/* 堆叠面板 */
.panel {
  position: relative;
  padding: clamp(20px, 2.6vw, 34px);
  background-color: var(--c-indigo);
  background-image: linear-gradient(160deg, rgba(200, 164, 74, 0.06), transparent 55%);
  border: 1px solid var(--line-gold);
  clip-path: polygon(
    0 0,
    calc(100% - var(--radius-cut)) 0,
    100% var(--radius-cut),
    100% 100%,
    var(--radius-cut) 100%,
    0 calc(100% - var(--radius-cut))
  );
}

.panel--tr {
  clip-path: polygon(0 0, calc(100% - 34px) 0, 100% 34px, 100% 100%, 0 100%);
}

.panel--bl {
  clip-path: polygon(0 0, 100% 0, 100% 100%, 34px 100%, 0 calc(100% - 34px));
}

.panel--jade {
  background-color: var(--c-jade);
  border-color: var(--line-celadon);
  background-image: linear-gradient(160deg, rgba(111, 176, 162, 0.09), transparent 58%);
}

.panel--wine {
  background-color: var(--c-wine);
  border-color: rgba(228, 112, 63, 0.28);
  background-image: linear-gradient(160deg, rgba(243, 237, 225, 0.06), transparent 60%);
}

.panel--paper {
  background-color: var(--c-paper);
  background-image: none;
  border-color: rgba(27, 36, 50, 0.14);
  color: var(--c-inkblack);
}

.panel--paper h2,
.panel--paper h3,
.panel--paper h4 { color: var(--c-inkblack); }

.panel--paper p,
.panel--paper li { color: #3A4453; }

/* 标签 */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  background-color: rgba(14, 53, 50, 0.5);
  border: 1px solid var(--line-celadon);
  color: var(--c-celadon);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  line-height: 1.5;
  letter-spacing: 0.08em;
  white-space: nowrap;
  clip-path: polygon(6px 0, 100% 0, 100% calc(100% - 6px), calc(100% - 6px) 100%, 0 100%, 0 6px);
}

.tag--gold {
  background-color: rgba(200, 164, 74, 0.1);
  border-color: var(--line-gold);
  color: var(--c-gold);
}

.tag--coral {
  background-color: rgba(228, 112, 63, 0.1);
  border-color: var(--line-coral);
  color: var(--c-coral);
}

/* 索引条目（左栏可折叠清单） */
.index-link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 12px;
  border-left: 2px solid transparent;
  color: var(--c-mist);
  font-size: 14px;
  line-height: 1.6;
  transition:
    color var(--t-fast) var(--ease-out),
    background-color var(--t-fast) var(--ease-out),
    border-color var(--t-fast) var(--ease-out),
    transform var(--t-fast) var(--ease-out);
}

.index-link:hover {
  color: var(--c-paper);
  transform: translateX(2px);
}

.index-link[data-current] {
  color: var(--c-paper);
  background-color: rgba(200, 164, 74, 0.08);
  border-left-color: var(--c-gold);
}

/* 图片容器基础规则 */
.figure { display: grid; gap: 10px; }

.figure-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background-color: var(--c-indigo);
  background-image: linear-gradient(140deg, #132743 0%, #0E3532 58%, #0A1826 100%);
  border: 1px solid var(--line-gold);
  clip-path: polygon(0 0, calc(100% - 34px) 0, 100% 34px, 100% 100%, 0 100%);
}

.figure-frame--wide { aspect-ratio: 21 / 9; }
.figure-frame--tall { aspect-ratio: 4 / 5; }
.figure-frame--square { aspect-ratio: 1 / 1; }

.figure-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    135deg,
    rgba(169, 183, 198, 0.07) 0 1px,
    transparent 1px 14px
  );
}

.figure-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle at 32% 18%, rgba(200, 164, 74, 0.16), transparent 62%);
  pointer-events: none;
}

.figure-frame img,
.figure-frame picture > img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.figure-tag {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 2;
  padding: 6px 12px;
  background-color: var(--c-gold);
  color: #14202C;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.1em;
}

.figure-caption {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: var(--c-mist);
}

/* ---------- 10. 响应式 ---------- */
@media (max-width: 1180px) {
  .nav-link { padding: 0 11px; font-size: 13px; }
  .header-cta-group .btn { padding: 10px 12px; }
}

@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .footer-nav-groups { grid-column: 1 / -1; order: 3; }
}

@media (max-width: 960px) {
  .nav-toggle { display: inline-flex; }

  .command-inner {
    flex-wrap: wrap;
    gap: 10px;
    padding-block: 10px;
    min-height: 0;
  }

  .command-nav {
    order: 4;
    flex: 0 0 100%;
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
    transition:
      max-height var(--t-mid) var(--ease-out),
      visibility var(--t-mid) var(--ease-out);
  }

  .command-nav[data-open] {
    max-height: 70vh;
    overflow-y: auto;
    visibility: visible;
  }

  .nav-list {
    flex-direction: column;
    gap: 0;
    padding-bottom: 6px;
  }

  .nav-link {
    min-height: 0;
    padding: 13px 8px;
    border-top: 0;
    border-bottom: 1px solid var(--line-mist);
    border-left: 2px solid transparent;
  }

  .nav-link:hover {
    border-bottom-color: var(--line-mist);
    border-left-color: var(--line-gold-strong);
    background-color: rgba(200, 164, 74, 0.07);
  }

  .nav-link[aria-current="page"] {
    border-bottom-color: var(--line-mist);
    border-left-color: var(--c-gold);
    background-color: rgba(200, 164, 74, 0.1);
  }

  .header-cta-group { order: 3; margin-left: auto; }
  .header-cta-group .btn { padding: 9px 12px; font-size: 12px; }
}

@media (max-width: 720px) {
  .header-utility { padding-block: 11px; }
  .brand-mark { font-size: 19px; }
  .status-chips { gap: 6px; }
  .status-chip { font-size: 11px; padding: 3px 9px 3px 7px; }
  .header-cta-group .btn-ghost { display: none; }
  .footer-nav-groups { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .footer-nav-groups { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-summary { max-width: none; }
}

@media (max-width: 420px) {
  .nav-toggle-text { display: none; }
  .header-cta-group .btn { padding: 9px 10px; }
}

/* ---------- 11. 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}