/* ==========================================================================
   皇冠入口中文站 · 共享样式 /assets/site.css
   设计语言：暗夜黑门厅 · 深石门堆叠面板 · 深金动线 · 切角画板
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 7.5rem;
}

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

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

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

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

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

/* ---------- 2. 变量 ---------- */
:root {
  --ink: #0B0B0D;
  --stone: #17181C;
  --gold: #C9A227;
  --bronze: #8C6F2F;
  --warm: #F5F0E6;
  --paper: #E8DFCF;
  --crimson: #7A2E35;
  --steel: #4A5A6A;
  --glass: #9FB4C4;
  --rule: #3A3730;
  --text-soft: #C6C0B3;

  --font-display: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", Georgia, serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;

  --cut: 22px;
  --gap: clamp(1.25rem, 3vw, 2rem);
  --shell-w: 1200px;
  --header-h: 76px;
}

/* ---------- 3. 基础排版 ---------- */
body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.9;
  color: var(--warm);
  background: var(--ink);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

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

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 4. 容器 ---------- */
.shell {
  width: min(var(--shell-w), calc(100% - 2.5rem));
  margin-inline: auto;
}

@media (max-width: 640px) {
  .shell { width: calc(100% - 1.75rem); }
}

/* ---------- 5. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: -140px;
  left: 1rem;
  z-index: 300;
  padding: 0.85rem 1.35rem;
  background: var(--gold);
  color: var(--ink);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  border: 1px solid var(--gold);
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 0.85rem;
  outline-offset: 4px;
}

/* ---------- 6. 头部外壳 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(11, 11, 13, 0.94);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--rule);
  color: var(--warm);
}

/* 6.1 铭带 */
.header-strip {
  background: var(--stone);
  border-bottom: 1px solid var(--rule);
}

.strip-inner {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  min-height: 40px;
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.strip-mark {
  font-weight: 700;
  letter-spacing: 0.26em;
  color: var(--bronze);
  flex: 0 0 auto;
}

.strip-text {
  margin-right: auto;
  color: var(--steel);
  letter-spacing: 0.12em;
  text-transform: none;
  font-size: 12.5px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.strip-link {
  flex: 0 0 auto;
  color: var(--glass);
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: color 0.25s ease, border-color 0.25s ease;
}

.strip-link:hover,
.strip-link:focus-visible {
  color: var(--gold);
  border-bottom-color: var(--gold);
}

/* 6.2 主行 */
.header-main { background: transparent; }

.header-inner {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  min-height: var(--header-h);
}

/* 6.3 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  flex: 0 0 auto;
  padding: 0.35rem 0;
}

.brand-crown {
  position: relative;
  width: 38px;
  height: 38px;
  flex: 0 0 auto;
  border: 1px solid var(--bronze);
  background: linear-gradient(145deg, rgba(201, 162, 39, 0.18), rgba(11, 11, 13, 0.92));
  clip-path: polygon(0 0, 74% 0, 100% 26%, 100% 100%, 0 100%);
}

.brand-crown::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 18px;
  height: 13px;
  background:
    linear-gradient(var(--gold), var(--gold)) 0 0 / 2px 10px no-repeat,
    linear-gradient(var(--gold), var(--gold)) 50% 0 / 2px 13px no-repeat,
    linear-gradient(var(--gold), var(--gold)) 100% 0 / 2px 10px no-repeat,
    linear-gradient(var(--gold), var(--gold)) 0 100% / 100% 2px no-repeat;
}

.brand-text { display: block; }

.brand-name {
  display: block;
  font-family: var(--font-display);
  font-size: 1.12rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--warm);
  line-height: 1.3;
}

.brand-sub {
  display: block;
  margin-top: 2px;
  font-size: 10px;
  letter-spacing: 0.26em;
  color: var(--bronze);
  text-transform: uppercase;
  line-height: 1.4;
}

/* 6.4 移动端开关 */
.nav-toggle {
  display: none;
  margin-left: auto;
  align-items: center;
  gap: 0.65rem;
  min-height: 44px;
  min-width: 44px;
  padding: 0.55rem 0.85rem;
  border: 1px solid var(--rule);
  color: var(--warm);
  transition: border-color 0.25s ease, color 0.25s ease;
}

.nav-toggle:hover { border-color: var(--bronze); color: var(--gold); }

.nav-toggle-bars {
  display: grid;
  gap: 4px;
  width: 18px;
  flex: 0 0 auto;
}

.nav-toggle-bars i {
  display: block;
  height: 1.5px;
  background: var(--gold);
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.nav-toggle-label {
  font-size: 13px;
  letter-spacing: 0.16em;
  white-space: nowrap;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(1) {
  transform: translateY(5.5px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(3) {
  transform: translateY(-5.5px) rotate(-45deg);
}

/* 6.5 主导航 */
.site-nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-left: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 0.1rem;
}

.nav-list a {
  position: relative;
  display: inline-block;
  padding: 0.6rem 0.7rem;
  font-size: 0.94rem;
  letter-spacing: 0.05em;
  color: var(--text-soft);
  transition: color 0.25s ease;
}

.nav-list a::after {
  content: "";
  position: absolute;
  left: 0.7rem;
  right: 0.7rem;
  bottom: 0.25rem;
  height: 1px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.32s ease;
}

.nav-list a:hover,
.nav-list a:focus-visible { color: var(--warm); }

.nav-list a:hover::after,
.nav-list a:focus-visible::after { transform: scaleX(1); }

.nav-list a[aria-current="page"] { color: var(--gold); }

.nav-list a[aria-current="page"]::after { transform: scaleX(1); }

.nav-cta {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding-left: 1.25rem;
  border-left: 1px solid var(--rule);
}

.nav-cta .btn {
  padding: 0.55rem 1rem;
  font-size: 0.85rem;
}

/* ---------- 7. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 44px;
  padding: 0.7rem 1.35rem;
  font-size: 0.92rem;
  font-weight: 500;
  letter-spacing: 0.07em;
  line-height: 1.3;
  text-align: center;
  border: 1px solid transparent;
  transition: background-color 0.25s ease, color 0.25s ease,
              border-color 0.25s ease, transform 0.25s ease;
}

.btn-gold {
  background: var(--gold);
  color: var(--ink);
  font-weight: 600;
  clip-path: polygon(0 0, calc(100% - 11px) 0, 100% 11px, 100% 100%, 0 100%);
}

.btn-gold:hover { background: #DCB43A; }
.btn-gold:active { transform: translateY(1px); }

.btn-ghost {
  background: transparent;
  border-color: var(--rule);
  color: var(--warm);
}

.btn-ghost:hover {
  border-color: var(--bronze);
  color: var(--gold);
}

/* ---------- 8. 滚动进度光带 ---------- */
.read-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: linear-gradient(90deg, var(--gold), var(--bronze) 55%, var(--glass));
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.12s linear;
  pointer-events: none;
}

/* ---------- 9. 页脚 ---------- */
.site-footer {
  position: relative;
  background: var(--stone);
  border-top: 1px solid var(--rule);
  padding: clamp(2.75rem, 6vw, 4.25rem) 0 2rem;
  color: var(--text-soft);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold) 18%, var(--bronze) 52%, transparent 88%);
  opacity: 0.55;
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr) minmax(0, 1fr) minmax(0, 1.2fr);
  gap: 2.75rem 2rem;
  padding-bottom: 2.75rem;
  border-bottom: 1px solid var(--rule);
}

.footer-mark {
  font-size: 11px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--bronze);
}

.footer-name {
  margin: 0.6rem 0 0.8rem;
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--warm);
  line-height: 1.4;
}

.footer-summary {
  max-width: 34ch;
  font-size: 0.92rem;
  line-height: 1.95;
  color: var(--steel);
}

.footer-col { min-width: 0; }

.footer-heading {
  margin-bottom: 0.95rem;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--gold);
}

.footer-links {
  display: grid;
  gap: 0.15rem;
}

.footer-links a {
  display: inline-block;
  padding: 0.4rem 0;
  font-size: 0.93rem;
  color: var(--steel);
  transition: color 0.25s ease, padding-left 0.25s ease;
}

.footer-links a:hover,
.footer-links a:focus-visible {
  color: var(--warm);
  padding-left: 0.35rem;
}

.footer-line {
  font-size: 0.9rem;
  line-height: 1.85;
  color: var(--text-soft);
  word-break: break-word;
}

.footer-line--muted {
  margin-top: 0.4rem;
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  color: var(--steel);
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.75rem 2rem;
  padding-top: 1.6rem;
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--steel);
}

.footer-region {
  color: var(--bronze);
  letter-spacing: 0.1em;
}

.footer-copy { color: var(--steel); }

/* ---------- 10. 章节与展览式标注 ---------- */
.section {
  padding: clamp(3rem, 8vw, 6rem) 0;
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.85rem 1.25rem;
  margin-bottom: 1.75rem;
}

.sec-index {
  font-family: var(--font-display);
  font-size: 1rem;
  letter-spacing: 0.14em;
  color: var(--gold);
  flex: 0 0 auto;
}

.eyebrow {
  font-size: 12px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--bronze);
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3.2vw, 2.15rem);
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1.4;
  color: var(--warm);
}

.section-note {
  margin-left: auto;
  font-size: 0.88rem;
  letter-spacing: 0.08em;
  color: var(--steel);
}

/* ---------- 11. 大标题与正文 ---------- */
.display {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.1rem, 5.2vw, 3.6rem);
  letter-spacing: 0.06em;
  line-height: 1.35;
  color: var(--warm);
}

.prose {
  max-width: 68ch;
  font-size: 1rem;
  line-height: 1.95;
  color: var(--text-soft);
}

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

.prose strong { color: var(--warm); font-weight: 600; }

/* ---------- 12. 切角面板 ---------- */
.panel {
  position: relative;
  padding: clamp(1.5rem, 4vw, 2.75rem);
  background: var(--stone);
  border: 1px solid var(--rule);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
}

.panel--paper {
  background: var(--paper);
  border-color: var(--bronze);
  color: var(--ink);
}

.panel--paper .display,
.panel--paper .section-title,
.panel--paper .prose { color: var(--ink); }

.panel--paper .prose { color: #3B352C; }

/* ---------- 13. 网格 ---------- */
.grid-2 {
  display: grid;
  gap: var(--gap);
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-3 {
  display: grid;
  gap: var(--gap);
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
}

/* ---------- 14. 图片容器基础规则 ---------- */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  background: linear-gradient(160deg, var(--stone) 0%, var(--ink) 100%);
  border: 1px solid var(--rule);
  clip-path: polygon(0 0, calc(100% - 26px) 0, 100% 26px, 100% 100%, 0 100%);
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(115deg, rgba(201, 162, 39, 0.16) 0%, transparent 42%, rgba(159, 180, 196, 0.12) 100%);
  pointer-events: none;
}

.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.06);
}

.media-frame--wide { aspect-ratio: 16 / 7; }
.media-frame--band { aspect-ratio: 21 / 9; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--tall { aspect-ratio: 3 / 4; }

/* ---------- 15. 面包屑 ---------- */
.breadcrumb { padding-top: 1.15rem; }

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.55rem;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--steel);
}

.breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
}

.breadcrumb li:not(:first-child)::before {
  content: "/";
  color: var(--rule);
}

.breadcrumb a { color: var(--steel); transition: color 0.25s ease; }

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

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

/* ---------- 16. 墨线 ---------- */
.rule {
  height: 1px;
  border: 0;
  margin: 0;
  background: var(--rule);
}

/* ---------- 17. 显现动效 ---------- */
[data-reveal] {
  transition: opacity 0.7s ease, transform 0.7s ease;
}

[data-reveal].is-hidden {
  opacity: 0;
  transform: translateY(18px);
}

/* ---------- 18. 响应式：平板与移动端 ---------- */
@media (max-width: 1040px) {
  :root { --header-h: 68px; }

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

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin-left: 0;
    max-height: calc(100vh - 120px);
    overflow-y: auto;
    padding: 0.5rem 1.25rem 1.4rem;
    background: var(--stone);
    border-top: 1px solid var(--rule);
    border-bottom: 1px solid var(--rule);
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.55);
  }

  .site-nav[data-open="true"] { display: flex; }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .nav-list a {
    display: block;
    padding: 0.95rem 0.15rem;
    font-size: 1rem;
    color: var(--warm);
    border-bottom: 1px solid var(--rule);
  }

  .nav-list a::after { display: none; }

  .nav-list a[aria-current="page"] { color: var(--gold); }

  .nav-list a[aria-current="page"]::before {
    content: "";
    display: inline-block;
    width: 6px;
    height: 6px;
    margin-right: 0.6rem;
    background: var(--gold);
    transform: rotate(45deg) translateY(-1px);
  }

  .nav-cta {
    flex-direction: column;
    align-items: stretch;
    gap: 0.6rem;
    padding: 1.15rem 0 0.25rem;
    border-left: 0;
  }

  .nav-cta .btn { width: 100%; font-size: 0.92rem; padding: 0.75rem 1rem; }

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

  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 640px) {
  .strip-text { display: none; }

  .strip-inner { gap: 0.75rem; min-height: 36px; }

  .strip-mark { letter-spacing: 0.2em; }

  .brand-crown { width: 34px; height: 34px; }

  .brand-name { font-size: 1.02rem; }

  .brand-sub { font-size: 9px; letter-spacing: 0.2em; }

  .nav-toggle-label { display: none; }

  .section-head {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  .section-note { margin-left: 0; }

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

  .footer-base {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
}

/* ---------- 19. 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],
  [data-reveal].is-hidden {
    opacity: 1;
    transform: none;
  }
}