/* ============================================================
   real-tengdahui.com.cn — /assets/site.css
   共享外壳：变量、重置、中文排版、报头、页脚、通用组件
   ============================================================ */

/* ---------- 1. 变量 ---------- */
:root {
  --ink: #0B1220;
  --ink-2: #0E1728;
  --panel: #131C2B;
  --line: #2A3648;
  --line-soft: #1D2739;
  --accent: #FF5A1F;
  --accent-soft: #FF8A4C;
  --silver: #C7D0DC;
  --white: #F2F5F9;
  --amber: #F5C77E;
  --green: #1E6F63;

  --shadow-hard: 6px 6px 0 rgba(0, 0, 0, .45);
  --shadow-soft: 0 18px 45px rgba(3, 7, 16, .45);

  --font-display: "Barlow Condensed", "Oswald", "Arial Narrow", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;

  --wrap: 1320px;
  --gutter: 24px;
  --sp-section: clamp(72px, 9vw, 150px);
  --ease: cubic-bezier(.22, 1, .36, 1);
}

/* ---------- 2. 重置 ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background-color: var(--ink);
  background-image:
    linear-gradient(rgba(42, 54, 72, .22) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42, 54, 72, .18) 1px, transparent 1px);
  background-size: 100% 120px, 120px 100%;
  color: var(--silver);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
main { display: block; }
img, svg, video { max-width: 100%; height: auto; }
h1, h2, h3, h4, h5, h6 {
  margin: 0 0 .6em;
  color: var(--white);
  font-family: var(--font-display);
  font-weight: 400;
  letter-spacing: .01em;
  line-height: 1.14;
}
p { margin: 0 0 1em; }
ul, ol { margin: 0 0 1em; }
a { color: var(--accent-soft); text-decoration: none; }
a:hover { color: var(--white); }
button { font: inherit; color: inherit; }
hr { border: 0; border-top: 2px solid var(--line); margin: 2.4em 0; }
[id] { scroll-margin-top: 120px; }

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

/* ---------- 3. 布局容器 ---------- */
.container {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--gutter);
}
.container--narrow { max-width: 920px; }

.section { padding: var(--sp-section) 0; }
.section--tight { padding: calc(var(--sp-section) / 2) 0; }
.divider { height: 2px; background: var(--line); border: 0; margin: 0; }

.grid { display: grid; gap: 24px; }
.grid--split { grid-template-columns: minmax(0, 3fr) minmax(0, 7fr); }
.grid--index { grid-template-columns: minmax(170px, 3fr) minmax(0, 7fr) minmax(0, 2fr); }
.grid--halves { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.stack { display: flex; flex-direction: column; gap: 16px; }

/* ---------- 4. 排版工具 ---------- */
.display {
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(72px, 11vw, 160px);
  line-height: .92;
  letter-spacing: -.01em;
  color: var(--white);
  margin: 0 0 .18em;
}
.section-title {
  font-family: var(--font-display);
  font-size: clamp(40px, 5vw, 56px);
  font-weight: 300;
  line-height: 1.06;
  color: var(--white);
  margin: 0 0 .3em;
}
.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--amber);
  margin: 0 0 12px;
}
.lead {
  font-size: clamp(18px, 1.6vw, 21px);
  line-height: 1.7;
  color: var(--silver);
  max-width: 62ch;
}
.mono {
  font-family: var(--font-mono);
  letter-spacing: .02em;
  font-size: 13px;
  color: var(--amber);
}
.prose { max-width: 72ch; font-size: 17px; }
.prose h2 { font-size: clamp(28px, 3vw, 38px); margin-top: 1.8em; }
.prose h3 { font-size: 22px; margin-top: 1.6em; color: var(--white); }
.prose p { margin: 0 0 1.15em; }
.prose ul, .prose ol { padding-left: 1.35em; }
.prose li { margin: .45em 0; }
.prose strong { color: var(--white); font-weight: 600; }
.prose code {
  font-family: var(--font-mono);
  font-size: .92em;
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 1px 6px;
}
.prose a { border-bottom: 2px solid var(--accent); }
.prose a:hover { border-bottom-color: var(--accent-soft); }

/* ---------- 5. 按钮与徽章 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 22px;
  border: 2px solid var(--line);
  background: var(--panel);
  color: var(--white);
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: .04em;
  text-decoration: none;
  cursor: pointer;
  box-shadow: var(--shadow-hard);
  transition: transform .24s var(--ease), border-color .24s var(--ease), background-color .24s var(--ease), color .24s var(--ease);
}
.btn:hover { transform: translate(-2px, -2px); border-color: var(--accent); color: var(--white); }
.btn:active { transform: translate(0, 0); }
.btn--primary { background: var(--accent); border-color: var(--accent); color: #0B1220; font-weight: 700; }
.btn--primary:hover { background: var(--accent-soft); border-color: var(--accent-soft); color: #0B1220; }
.btn--ghost { background: transparent; color: var(--accent); border-color: var(--accent); box-shadow: none; }
.btn--ghost:hover { background: var(--accent); color: #0B1220; }

.badge {
  display: inline-block;
  padding: 4px 10px;
  border: 2px solid var(--line);
  background: var(--panel);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--silver);
}
.badge--live { border-color: var(--accent); color: var(--accent); }
.badge--done { border-color: var(--green); color: #59C3B4; }
.badge--soon { border-color: var(--amber); color: var(--amber); }

/* ---------- 6. 报头 ---------- */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 200;
  padding: 12px 20px;
  background: var(--accent);
  color: #0B1220;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
}
.skip-link:focus { left: 16px; top: 14px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: rgba(11, 18, 32, .95);
  border-bottom: 2px solid var(--line);
  backdrop-filter: saturate(140%) blur(10px);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
}
.header-meter {
  height: 3px;
  background: var(--line-soft);
  overflow: hidden;
}
.header-meter__bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--accent) 0%, var(--amber) 100%);
  transition: width .12s linear;
}
.header-inner {
  display: grid;
  grid-template-columns: minmax(200px, 1fr) auto minmax(200px, 1fr);
  align-items: center;
  gap: 20px;
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 16px var(--gutter);
  transition: padding .28s var(--ease);
}
.brand-lockup { display: flex; align-items: center; gap: 12px; min-width: 0; }
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--white);
  text-decoration: none;
}
.brand__mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border: 2px solid var(--accent);
  background: linear-gradient(135deg, rgba(255, 90, 31, .22), transparent 70%);
  color: var(--accent);
  font-family: var(--font-display);
  font-size: 19px;
  line-height: 1;
  transition: width .28s var(--ease), height .28s var(--ease), font-size .28s var(--ease);
}
.brand__name {
  font-family: var(--font-display);
  font-size: 25px;
  font-weight: 400;
  letter-spacing: .08em;
  white-space: nowrap;
}
.brand__abbr {
  display: none;
  font-family: var(--font-display);
  font-size: 21px;
  letter-spacing: .14em;
  white-space: nowrap;
}
.version-tag {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--amber);
  background: var(--panel);
  border: 2px solid var(--line);
  padding: 3px 8px;
}
.site-nav { display: flex; align-items: center; justify-content: center; }
.site-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.site-nav__list a {
  display: inline-block;
  padding: 9px 13px;
  border: 2px solid transparent;
  color: var(--silver);
  font-size: 15.5px;
  letter-spacing: .02em;
  text-decoration: none;
  transition: color .2s var(--ease), background-color .2s var(--ease), border-color .2s var(--ease);
}
.site-nav__list a:hover { color: var(--white); background: var(--panel); border-color: var(--line); }
.site-nav__list a[aria-current="page"] {
  color: var(--white);
  border-color: var(--accent);
  background: linear-gradient(180deg, rgba(255, 90, 31, .16), transparent);
}
.nav-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 16px;
  border: 2px solid var(--accent);
  background: transparent;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  text-decoration: none;
  white-space: nowrap;
  transition: background-color .22s var(--ease), color .22s var(--ease), transform .22s var(--ease);
}
.nav-cta:hover { background: var(--accent); color: #0B1220; transform: translateY(-1px); }
.nav-cta--bar { justify-self: end; }
.nav-cta--panel { display: none; }
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  justify-self: end;
  padding: 10px 14px;
  border: 2px solid var(--line);
  background: var(--panel);
  color: var(--white);
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
}
.nav-toggle:hover { border-color: var(--accent); color: var(--accent); }
.nav-toggle__bars { display: inline-flex; flex-direction: column; gap: 4px; width: 20px; }
.nav-toggle__bars i { display: block; height: 2px; background: currentColor; }

/* 压缩态 */
.site-header.is-compact .header-inner { padding: 8px var(--gutter); }
.site-header.is-compact .brand__name { display: none; }
.site-header.is-compact .brand__abbr { display: inline; }
.site-header.is-compact .brand__mark { width: 26px; height: 26px; font-size: 15px; }
.site-header.is-compact .site-nav__list a { padding: 7px 11px; font-size: 14.5px; }

/* ---------- 7. 子组件 ---------- */
.exhibit {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px;
  align-items: start;
  padding: 16px 20px;
  border: 2px solid var(--line);
  border-left: 6px solid var(--accent);
  background: var(--panel);
  box-shadow: var(--shadow-hard);
}
.exhibit__no {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--accent);
  padding-top: 4px;
}
.exhibit__name {
  font-family: var(--font-display);
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 400;
  line-height: 1.1;
  color: var(--white);
  margin: 0;
}
.exhibit__note { font-size: 14px; color: var(--silver); margin: 6px 0 0; }

.card {
  padding: 22px 22px 24px;
  border: 2px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow-hard);
  transition: transform .26s var(--ease), border-color .26s var(--ease), box-shadow .26s var(--ease);
}
.card:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
  box-shadow: 8px 8px 0 rgba(255, 90, 31, .22);
}
.card__meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--amber);
  margin: 0 0 10px;
}
.card__title {
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 400;
  color: var(--white);
  margin: 0 0 .35em;
}
.card p:last-child { margin-bottom: 0; }

.plate {
  border: 2px solid var(--line);
  background: var(--ink-2);
  padding: 14px 18px;
}
.plate__label {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--silver);
  margin-bottom: 4px;
}
.plate__value {
  display: block;
  font-family: var(--font-mono);
  font-size: 24px;
  color: var(--white);
  letter-spacing: .02em;
}

.breadcrumb {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--silver);
  padding: 18px 0 0;
}
.breadcrumb ol { display: flex; flex-wrap: wrap; gap: 8px; list-style: none; margin: 0; padding: 0; }
.breadcrumb li::after { content: "/"; margin-left: 8px; color: var(--line); }
.breadcrumb li:last-child::after { content: ""; }
.breadcrumb a { color: var(--silver); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb [aria-current="page"] { color: var(--white); }

.section-index {
  border-left: 2px solid var(--line);
  padding-left: 0;
  position: sticky;
  top: 120px;
}
.section-index__link {
  display: block;
  padding: 8px 12px;
  margin-left: -2px;
  border-left: 2px solid transparent;
  color: var(--silver);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .06em;
  text-decoration: none;
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}
.section-index__link:hover { color: var(--white); border-left-color: var(--accent-soft); }
.section-index__link.is-active {
  color: var(--accent);
  border-left-color: var(--accent);
  background: linear-gradient(90deg, rgba(255, 90, 31, .14), transparent);
}

.timeline { list-style: none; margin: 0; padding: 0; }
.timeline__item { position: relative; padding: 0 0 36px 36px; }
.timeline__item::after {
  content: "";
  position: absolute;
  left: 7px;
  top: 18px;
  bottom: 0;
  width: 2px;
  background: var(--line);
}
.timeline__item:last-child { padding-bottom: 0; }
.timeline__item:last-child::after { display: none; }
.timeline__dot {
  position: absolute;
  left: 0;
  top: 5px;
  width: 16px;
  height: 16px;
  border: 2px solid var(--line);
  background: var(--panel);
}
.timeline__item.is-current .timeline__dot {
  border-color: var(--accent);
  background: var(--accent);
  animation: node-pulse 3s ease-in-out infinite;
}
.timeline__time {
  display: block;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .08em;
  color: var(--amber);
  margin-bottom: 6px;
}
.timeline__body { margin: 0; color: var(--silver); }
@keyframes node-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(255, 90, 31, .5); }
  50% { box-shadow: 0 0 0 9px rgba(255, 90, 31, 0); }
}

/* 图片容器基础规则（页面阶段放置 <img>） */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  border: 2px solid var(--line);
  background:
    repeating-linear-gradient(135deg, #101a2b 0 12px, #0d1524 12px 24px);
  box-shadow: var(--shadow-hard);
}
.media img { display: block; width: 100%; height: 100%; object-fit: cover; }
.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x3 { aspect-ratio: 4 / 3; }
.media--1x1 { aspect-ratio: 1 / 1; }
.media--21x9 { aspect-ratio: 21 / 9; }
.media__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 10px 14px;
  border-top: 2px solid var(--line);
  background: rgba(11, 18, 32, .88);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--silver);
}

.field-input {
  width: 100%;
  padding: 12px 14px;
  border: 2px solid var(--line);
  background: var(--ink-2);
  color: var(--white);
  font-family: var(--font-body);
  font-size: 16px;
}
.field-input::placeholder { color: #7C8798; }
.field-input:focus { border-color: var(--accent); outline: none; }

/* 显现 */
[data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .32s var(--ease), transform .32s var(--ease);
}
[data-reveal].is-visible { opacity: 1; transform: none; }

/* 返回顶部（脚本注入） */
.to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 90;
  width: 50px;
  height: 50px;
  border: 2px solid var(--accent);
  background: var(--panel);
  color: var(--accent);
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: opacity .25s var(--ease), visibility .25s var(--ease), background-color .25s var(--ease), color .25s var(--ease);
}
.to-top.is-on { opacity: 1; visibility: visible; }
.to-top:hover { background: var(--accent); color: #0B1220; }

/* ---------- 8. 页脚 ---------- */
.site-footer {
  margin-top: var(--sp-section);
  border-top: 2px solid var(--line);
  background: linear-gradient(180deg, var(--ink-2) 0%, var(--ink) 100%);
}
.footer-grid {
  display: grid;
  grid-template-columns: minmax(220px, 1.3fr) repeat(3, minmax(150px, 1fr)) minmax(230px, 1.3fr);
  gap: 40px;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 64px var(--gutter) 44px;
}
.footer-brand__name {
  font-family: var(--font-display);
  font-size: 30px;
  letter-spacing: .08em;
  color: var(--white);
  margin: 0 0 .35em;
}
.footer-brand__line {
  font-size: 14px;
  line-height: 1.7;
  color: var(--silver);
  margin: 0 0 .5em;
}
.footer-brand .badge { margin-top: 10px; }
.footer-col__title {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .16em;
  color: var(--amber);
  text-transform: uppercase;
  margin: 0 0 14px;
  padding-top: 14px;
  border-top: 2px solid var(--line);
}
.footer-list { list-style: none; margin: 0 0 12px; padding: 0; }
.footer-list li { margin: 0 0 8px; }
.footer-list a {
  color: var(--silver);
  font-size: 15px;
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.footer-list a:hover { color: var(--white); border-bottom-color: var(--accent); }
.footer-line {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .04em;
  line-height: 1.8;
  color: var(--silver);
  margin: 0 0 6px;
  word-break: break-word;
}
.footer-col--contact .footer-line { color: var(--white); }
.footer-base {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 32px;
  justify-content: space-between;
  align-items: center;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 22px var(--gutter) 30px;
  border-top: 2px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--silver);
}
.footer-base p { margin: 0; }
.footer-base__meta { color: var(--amber); }

/* ---------- 9. 响应式 ---------- */
@media (max-width: 1180px) {
  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 32px;
  }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 1024px) {
  .grid--split,
  .grid--index,
  .grid--halves { grid-template-columns: minmax(0, 1fr); }
  .section-index { position: static; border-left: 0; border-top: 2px solid var(--line); padding-top: 10px; }
  .section-index__link { margin-left: 0; border-left: 2px solid transparent; }
}

@media (max-width: 960px) {
  body { font-size: 16.5px; }
  .header-inner {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 12px;
    padding: 12px var(--gutter);
  }
  .brand__name { font-size: 20px; letter-spacing: .05em; }
  .brand__mark { width: 30px; height: 30px; font-size: 17px; }
  .version-tag { font-size: 11px; padding: 2px 6px; }
  .nav-cta--bar { display: none; }
  .nav-toggle { display: inline-flex; }
  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    max-height: calc(100vh - 80px);
    overflow-y: auto;
    padding: 10px var(--gutter) 22px;
    background: var(--panel);
    border-top: 2px solid var(--line);
    border-bottom: 2px solid var(--line);
    box-shadow: var(--shadow-soft);
  }
  .site-nav[data-open] { display: flex; }
  .site-nav__list { flex-direction: column; align-items: stretch; gap: 0; }
  .site-nav__list a {
    display: block;
    padding: 14px 10px;
    font-size: 16px;
    border: 0;
    border-left: 3px solid transparent;
    border-bottom: 1px solid var(--line-soft);
  }
  .site-nav__list a:hover { border-left-color: var(--accent-soft); }
  .site-nav__list a[aria-current="page"] {
    border-left-color: var(--accent);
    background: linear-gradient(90deg, rgba(255, 90, 31, .16), transparent);
  }
  .nav-cta--panel { display: flex; margin-top: 18px; }
  .footer-grid { grid-template-columns: minmax(0, 1fr); padding-top: 48px; }
  .footer-brand { grid-column: auto; }
  .to-top { right: 16px; bottom: 16px; width: 46px; height: 46px; }
}

@media (max-width: 640px) {
  :root { --gutter: 18px; }
  .display { font-size: clamp(56px, 18vw, 92px); }
  .section-title { font-size: clamp(32px, 9vw, 40px); }
  .exhibit { grid-template-columns: minmax(0, 1fr); gap: 8px; padding: 14px 16px; }
  .exhibit__no { padding-top: 0; }
  .footer-base { flex-direction: column; align-items: flex-start; }
  .timeline__item { padding-left: 28px; }
}

@media print {
  .site-header, .to-top, .site-footer { display: none; }
  body { background: #fff; color: #111; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  [data-reveal] { opacity: 1; transform: none; }
  .header-meter__bar { transition: none; }
}