/* ==========================================================================
   尊龙A9厅 · 共享样式表  /assets/site.css
   秩序骨架：深墨黑 + 暖金铜 + 朱砂红少量行动点 + 冷灰蓝平衡参数阅读
   ========================================================================== */

/* ---------- 1. 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, dl, dt, dd, figure, blockquote, hr {
  margin: 0;
  padding: 0;
}

ul, ol { list-style: none; }

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

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

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

button {
  background: none;
  border: 0;
  cursor: pointer;
}

table { border-collapse: collapse; border-spacing: 0; }

/* ---------- 2. 变量 ---------- */
:root {
  --ink-900: #14110F;
  --ink-700: #26221E;
  --bronze-500: #B98A3E;
  --bronze-700: #8A6420;
  --bronze-200: #E4CD9E;
  --cinnabar-600: #C0392B;
  --cinnabar-700: #A32A1E;
  --slate-600: #4C6577;
  --slate-100: #E1E8ED;
  --mineral-500: #6E6A63;
  --clay-500: #A9684F;
  --paper-100: #F4F0E8;
  --veil-glass: rgba(20, 17, 15, 0.62);

  --hairline-bronze: rgba(185, 138, 62, 0.26);
  --hairline-ink: rgba(20, 17, 15, 0.10);
  --on-dark: rgba(244, 240, 232, 0.80);
  --on-dark-dim: rgba(244, 240, 232, 0.56);

  --font-head: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --shell-w: 1280px;
  --pad: clamp(20px, 4vw, 56px);

  --fs-12: 12px;
  --fs-14: 14px;
  --fs-16: 16px;
  --fs-18: 18px;
  --fs-22: 22px;
  --fs-28: 28px;
  --fs-40: 40px;
  --fs-64: 64px;

  --ease: cubic-bezier(0.22, 0.68, 0.36, 1);
  --dur: 220ms;
}

/* ---------- 3. 基础排版 ---------- */
body {
  background-color: var(--paper-100);
  color: var(--ink-700);
  font-family: var(--font-body);
  font-size: var(--fs-18);
  font-weight: 400;
  line-height: 1.85;
  letter-spacing: 0.008em;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--ink-900);
}

h1 { font-size: clamp(38px, 6.6vw, 96px); }
h2 { font-size: clamp(28px, 3.6vw, 40px); }
h3 { font-size: clamp(22px, 2.4vw, 28px); }

p { max-width: 74ch; }

::selection {
  background: var(--bronze-500);
  color: var(--ink-900);
}

:focus-visible {
  outline: 2px solid var(--bronze-500);
  outline-offset: 3px;
  border-radius: 2px;
}

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

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

.grid {
  display: grid;
  gap: clamp(20px, 3vw, 40px);
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--split { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); }
.grid--split-rev { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }

.rule {
  display: block;
  height: 1px;
  border: 0;
  background: linear-gradient(90deg, var(--bronze-500), rgba(185, 138, 62, 0));
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--bronze-700);
}

.eyebrow::before {
  content: "";
  width: 18px;
  height: 1px;
  background: var(--bronze-500);
}

.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.01em;
}

/* ---------- 5. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 22px;
  border: 1px solid transparent;
  border-radius: 2px;
  font-family: var(--font-body);
  font-size: var(--fs-16);
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.2;
  white-space: nowrap;
  transition: background-color var(--dur) var(--ease),
              color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              transform var(--dur) var(--ease);
}

.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn--accent {
  background-color: var(--cinnabar-600);
  color: #FFFFFF;
  border-color: var(--cinnabar-600);
}
.btn--accent:hover {
  background-color: var(--cinnabar-700);
  border-color: var(--cinnabar-700);
}

.btn--ghost {
  background-color: transparent;
  color: var(--bronze-200);
  border-color: rgba(228, 205, 158, 0.42);
}
.btn--ghost:hover {
  background-color: rgba(228, 205, 158, 0.12);
  border-color: var(--bronze-200);
}

.btn--solid {
  background-color: var(--bronze-500);
  color: var(--ink-900);
  border-color: var(--bronze-500);
}
.btn--solid:hover {
  background-color: var(--bronze-200);
  border-color: var(--bronze-200);
}

.btn--line {
  background-color: transparent;
  color: var(--ink-900);
  border-color: rgba(20, 17, 15, 0.28);
}
.btn--line:hover {
  border-color: var(--bronze-700);
  color: var(--bronze-700);
}

/* ---------- 6. 跳跃链接 ---------- */
.skip-link {
  position: absolute;
  left: 16px;
  top: -120px;
  z-index: 200;
  padding: 12px 20px;
  background-color: var(--bronze-500);
  color: var(--ink-900);
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  font-weight: 700;
  border-radius: 2px;
  transition: top var(--dur) var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible { top: 16px; }

/* ---------- 7. 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background-color: var(--ink-900);
  color: var(--paper-100);
}

.header-upper {
  height: 68px;
  overflow: hidden;
  background-color: var(--ink-700);
  border-bottom: 1px solid var(--hairline-bronze);
  transition: height var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.site-header.is-scrolled .header-upper {
  height: 0;
  opacity: 0;
  border-bottom-color: transparent;
}

.header-upper__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  width: 100%;
  max-width: var(--shell-w);
  height: 100%;
  margin-inline: auto;
  padding-inline: var(--pad);
}

/* 品牌标识 */
.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  flex: 0 0 auto;
}

.brand-mark__seal {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 2px;
  background: linear-gradient(150deg, var(--bronze-200) 0%, var(--bronze-500) 52%, var(--bronze-700) 100%);
  color: var(--ink-900);
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  font-weight: 700;
  letter-spacing: 0.02em;
  box-shadow: inset 0 0 0 1px rgba(20, 17, 15, 0.35);
}

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

.brand-mark__name {
  font-family: var(--font-head);
  font-size: var(--fs-22);
  font-weight: 800;
  line-height: 1.1;
  color: var(--paper-100);
  letter-spacing: 0.02em;
}

.brand-mark__line {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  line-height: 1.3;
  letter-spacing: 0.06em;
  color: var(--bronze-500);
}

.header-upper__strip {
  max-width: none;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.05em;
  line-height: 1.5;
  text-align: right;
  color: var(--bronze-200);
  opacity: 0.82;
}

/* 下层栏目轨道 */
.header-lower {
  position: relative;
  background-color: var(--veil-glass);
  backdrop-filter: blur(12px) saturate(1.15);
  -webkit-backdrop-filter: blur(12px) saturate(1.15);
  border-bottom: 1px solid var(--hairline-bronze);
  transition: background-color var(--dur) var(--ease);
}

.site-header.is-scrolled .header-lower {
  background-color: rgba(20, 17, 15, 0.86);
}

.header-lower__inner {
  display: flex;
  align-items: center;
  gap: 22px;
  width: 100%;
  max-width: var(--shell-w);
  min-height: 60px;
  margin-inline: auto;
  padding-inline: var(--pad);
}

.header-lower__progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  display: block;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--bronze-700), var(--bronze-200));
  transition: width 90ms linear;
}

/* 导航 */
.site-nav { flex: 1 1 auto; }

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
  flex-wrap: wrap;
}

.site-nav__list a {
  position: relative;
  display: block;
  padding: 9px 14px;
  border-radius: 2px;
  font-size: var(--fs-16);
  font-weight: 500;
  line-height: 1.4;
  color: var(--on-dark);
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.site-nav__list a:hover {
  color: var(--bronze-200);
  background-color: rgba(185, 138, 62, 0.14);
}

.site-nav__list a[aria-current="page"] { color: var(--bronze-200); }

.site-nav__list a[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 2px;
  height: 2px;
  background-color: var(--bronze-500);
}

/* 右侧行动区 */
.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

/* 移动端按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 14px;
  border: 1px solid rgba(228, 205, 158, 0.34);
  border-radius: 2px;
  color: var(--bronze-200);
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  letter-spacing: 0.06em;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.nav-toggle:hover { border-color: var(--bronze-200); background-color: rgba(228, 205, 158, 0.10); }

.nav-toggle__bars {
  display: grid;
  gap: 4px;
  width: 18px;
}

.nav-toggle__bars span {
  display: block;
  height: 2px;
  border-radius: 1px;
  background-color: currentColor;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.nav-toggle.is-open .nav-toggle__bars span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle.is-open .nav-toggle__bars span:nth-child(2) { opacity: 0; }
.nav-toggle.is-open .nav-toggle__bars span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ---------- 8. 页脚 ---------- */
.site-footer {
  position: relative;
  background-color: var(--ink-900);
  color: var(--on-dark);
  padding-top: clamp(52px, 7vw, 104px);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: linear-gradient(90deg, rgba(185, 138, 62, 0), var(--bronze-500) 30%, var(--bronze-500) 70%, rgba(185, 138, 62, 0));
}

.footer-slogan {
  position: relative;
  padding-bottom: clamp(28px, 4vw, 48px);
}

.footer-slogan__text {
  max-width: 16ch;
  font-family: var(--font-head);
  font-size: clamp(30px, 5.2vw, 64px);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--paper-100);
}

.footer-slogan__rule {
  display: block;
  width: min(320px, 100%);
  height: 1px;
  margin-top: clamp(24px, 3vw, 40px);
  background: linear-gradient(90deg, var(--bronze-500), rgba(185, 138, 62, 0));
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(24px, 3vw, 44px);
  padding-block: clamp(28px, 4vw, 48px);
  border-top: 1px solid rgba(185, 138, 62, 0.20);
  border-bottom: 1px solid rgba(185, 138, 62, 0.20);
}

.footer-col__title {
  font-family: var(--font-body);
  font-size: var(--fs-14);
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--bronze-500);
}

.footer-col__list {
  margin-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-col__list li {
  font-size: var(--fs-16);
  line-height: 1.6;
  color: var(--on-dark-dim);
}

.footer-ledger {
  padding-block: clamp(28px, 4vw, 44px);
}

.footer-ledger__list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.footer-ledger__row {
  display: grid;
  grid-template-columns: minmax(140px, 200px) minmax(0, 1fr);
  gap: 20px;
  align-items: baseline;
  padding-bottom: 14px;
  border-bottom: 1px dashed rgba(185, 138, 62, 0.22);
}

.footer-ledger__row:last-child { border-bottom: 0; padding-bottom: 0; }

.footer-ledger__key {
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  letter-spacing: 0.06em;
  color: var(--bronze-200);
}

.footer-ledger__val {
  margin: 0;
  max-width: 78ch;
  font-size: var(--fs-16);
  line-height: 1.75;
  color: var(--on-dark);
}

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-bottom: clamp(32px, 4vw, 56px);
}

.footer-contact__line {
  max-width: none;
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  line-height: 1.7;
  letter-spacing: 0.02em;
  color: var(--bronze-200);
}

.footer-contact__line--muted {
  color: var(--on-dark-dim);
  font-family: var(--font-body);
  letter-spacing: 0.02em;
}

.footer-base {
  background-color: var(--ink-700);
  border-top: 1px solid var(--hairline-bronze);
}

.footer-base__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 28px;
  min-height: 66px;
  padding-block: 14px;
}

.footer-base__copy,
.footer-base__icp {
  max-width: none;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.04em;
  color: var(--on-dark-dim);
}

.footer-base__icp { color: var(--bronze-500); }

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 22px;
  margin-left: auto;
}

.footer-legal a {
  position: relative;
  font-size: var(--fs-14);
  color: var(--on-dark);
  border-bottom: 1px solid rgba(185, 138, 62, 0.35);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.footer-legal a:hover {
  color: var(--bronze-200);
  border-bottom-color: var(--bronze-200);
}

/* ---------- 9. 正文容器 / 章节头 ---------- */
.prose {
  max-width: 68ch;
  font-size: var(--fs-18);
  line-height: 1.9;
  color: var(--ink-700);
}

.prose > * + * { margin-top: 1.15em; }

.prose h2 {
  margin-top: 2.2em;
  font-size: clamp(24px, 3vw, 34px);
}

.prose h3 { margin-top: 1.8em; }

.prose strong { color: var(--ink-900); font-weight: 700; }

.prose a {
  color: var(--bronze-700);
  border-bottom: 1px solid rgba(185, 138, 62, 0.5);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.prose a:hover { color: var(--cinnabar-600); border-bottom-color: var(--cinnabar-600); }

.prose ul,
.prose ol { padding-left: 1.4em; }

.prose ul { list-style: disc; }
.prose ol { list-style: decimal; }
.prose li { margin-top: 0.4em; }
.prose li::marker { color: var(--bronze-500); }

.section-head {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: clamp(20px, 3vw, 36px);
}

.section-head__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(32px, 4.4vw, 64px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--bronze-500);
}

.section-head__title {
  font-family: var(--font-head);
  font-size: clamp(24px, 3vw, 40px);
  font-weight: 800;
  color: var(--ink-900);
}

.section-head__note {
  max-width: 62ch;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--mineral-500);
}

/* ---------- 10. 面包屑 ---------- */
.breadcrumb {
  padding-block: 16px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--mineral-500);
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.breadcrumb__list li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--bronze-500);
}

.breadcrumb__list a { color: var(--slate-600); }
.breadcrumb__list a:hover { color: var(--bronze-700); }

/* ---------- 11. 图片容器 ---------- */
.media {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--hairline-ink);
  border-radius: 2px;
  background-color: var(--slate-100);
}

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

.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x3 { aspect-ratio: 4 / 3; }
.media--3x2 { aspect-ratio: 3 / 2; }
.media--1x1 { aspect-ratio: 1 / 1; }

.media__caption {
  position: absolute;
  inset: auto 0 0 0;
  padding: 12px 16px;
  background: linear-gradient(to top, rgba(20, 17, 15, 0.78), rgba(20, 17, 15, 0));
  color: var(--paper-100);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  line-height: 1.5;
  letter-spacing: 0.04em;
}

/* ---------- 12. 显现动画 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 620ms var(--ease), transform 620ms var(--ease);
  will-change: opacity, transform;
}

[data-reveal].is-in {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 13. 响应式 ---------- */
@media (max-width: 1080px) {
  .grid--split,
  .grid--split-rev { grid-template-columns: minmax(0, 1fr); }

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

@media (max-width: 940px) {
  .header-actions .btn--ghost { display: none; }
  .header-upper__strip { display: none; }

  .nav-toggle { display: inline-flex; order: 1; }

  .header-actions { order: 2; margin-left: auto; }

  .site-nav {
    order: 3;
    flex: 1 0 100%;
    max-height: 0;
    overflow: hidden;
    transition: max-height 320ms var(--ease);
  }

  .site-nav[data-open="true"] { max-height: 520px; }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding-bottom: 10px;
  }

  .site-nav__list a {
    padding: 15px 4px;
    font-size: var(--fs-16);
    border-bottom: 1px solid rgba(185, 138, 62, 0.14);
  }

  .site-nav__list a[aria-current="page"]::after {
    left: 4px;
    right: auto;
    width: 24px;
    bottom: 9px;
  }

  .header-lower__inner { flex-wrap: wrap; padding-block: 10px; }

  .grid--2,
  .grid--3 { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 640px) {
  body { font-size: var(--fs-16); }

  .header-upper { height: 58px; }
  .brand-mark__seal { width: 34px; height: 34px; font-size: var(--fs-12); }
  .brand-mark__name { font-size: var(--fs-18); }
  .brand-mark__line { display: none; }

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

  .footer-ledger__row {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
  }

  .footer-base__inner { flex-direction: column; align-items: flex-start; }
  .footer-legal { margin-left: 0; }
}

/* ---------- 14. 动效降级 ---------- */
@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;
  }

  [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }

  .header-upper { transition: none !important; }
  .btn:hover { transform: none; }
}