/* ============================================================
   /assets/site.css — 新世纪中心 共享外壳与基础组件
   说明：桌面端 body 预留左侧轨道宽度；页面级 CSS 请勿重置
   body 的 padding-inline-start 与 html 的 scroll-padding。
   ============================================================ */

:root {
  --ink-900: #0B1B2B;
  --ink-800: #12263A;
  --ink-700: #1B3550;
  --paper: #F3EFE7;
  --cool: #E8EDF2;
  --text: #1B232A;
  --muted: #64748B;
  --copper: #B98A4B;
  --copper-bright: #D6A85F;
  --cyan: #4FE0D0;
  --violet: #6E5AE6;
  --green: #2FBF71;

  --rail-w: 272px;
  --bar-h: 68px;
  --page-max: 1180px;

  --font-display: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", Georgia, serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --dur: 160ms;
  --ease: cubic-bezier(.2, .6, .2, 1);
  --hard-shadow: 6px 6px 0 rgba(11, 27, 43, .14);
}

/* ---------- reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-padding-block-start: calc(var(--bar-h) + 16px);
}

body {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: .01em;
  color: var(--text);
  background: var(--paper);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, p, ul, ol, figure, blockquote { margin: 0; }

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

a { color: inherit; }

button { font: inherit; color: inherit; }

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

.site-header :focus-visible,
.site-footer :focus-visible { outline-color: var(--cyan); }

/* ---------- skip link ---------- */
.skip-link {
  position: absolute;
  top: 0;
  left: -9999px;
  z-index: 200;
  padding: .7rem 1.1rem;
  background: var(--copper-bright);
  color: var(--ink-900);
  font-weight: 700;
  font-size: .9375rem;
  text-decoration: none;
  border: 2px solid var(--ink-900);
}

.skip-link:focus {
  left: .75rem;
  top: .75rem;
}

/* ---------- 阅读进度 ---------- */
.progress-rail {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: rgba(185, 138, 75, .2);
  z-index: 5;
  pointer-events: none;
}

.progress-rail__bar {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--copper-bright), var(--cyan));
  transition: width 90ms linear;
}

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: var(--ink-900);
  border-bottom: 2px solid var(--copper);
}

.rail {
  position: relative;
  z-index: 3;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .75rem;
  height: var(--bar-h);
  padding: 0 1rem;
  background: var(--ink-900);
}

.rail__brand {
  display: flex;
  align-items: center;
  gap: .6rem;
  text-decoration: none;
  min-width: 0;
}

.rail__mark {
  flex: none;
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  background: var(--ink-800);
  border: 2px solid var(--copper-bright);
  color: var(--copper-bright);
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.05rem;
  line-height: 1;
}

.rail__brand-text {
  display: flex;
  flex-direction: column;
  gap: .1rem;
  min-width: 0;
}

.rail__brand-line {
  font-size: 1.02rem;
  font-weight: 900;
  letter-spacing: .05em;
  line-height: 1.15;
  color: var(--paper);
}

.rail__descriptor {
  font-family: var(--font-mono);
  font-size: .625rem;
  letter-spacing: .14em;
  line-height: 1.4;
  color: var(--cyan);
  white-space: nowrap;
}

.rail__toggle {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  flex: none;
  padding: .45rem .7rem;
  background: transparent;
  border: 2px solid var(--ink-700);
  color: var(--paper);
  font-size: .8125rem;
  font-weight: 500;
  cursor: pointer;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.rail__toggle:hover {
  border-color: var(--copper-bright);
  color: var(--copper-bright);
}

.rail__toggle-bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  transition: background var(--dur) var(--ease);
}

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

.rail__toggle-bars::before { top: -6px; }
.rail__toggle-bars::after { top: 6px; }

.site-header[data-open] .rail__toggle-bars { background: transparent; }
.site-header[data-open] .rail__toggle-bars::before { transform: translateY(6px) rotate(45deg); }
.site-header[data-open] .rail__toggle-bars::after { transform: translateY(-6px) rotate(-45deg); }

.rail__nav {
  position: fixed;
  top: var(--bar-h);
  left: 0;
  bottom: 0;
  z-index: 3;
  display: flex;
  flex-direction: column;
  width: min(84vw, 336px);
  padding: 1.15rem 0 0;
  background: var(--ink-800);
  border-inline-end: 3px solid var(--copper);
  overflow-y: auto;
  transform: translateX(-101%);
  visibility: hidden;
  transition: transform 180ms var(--ease), visibility 180ms linear;
}

.site-header[data-open] .rail__nav {
  transform: none;
  visibility: visible;
}

.nav-scrim {
  position: fixed;
  top: var(--bar-h);
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 2;
  background: rgba(11, 27, 43, .58);
  opacity: 0;
  pointer-events: none;
  transition: opacity 180ms var(--ease);
}

.site-header[data-open] .nav-scrim {
  opacity: 1;
  pointer-events: auto;
}

.rail__nav-label {
  margin-bottom: .65rem;
  padding: 0 1.25rem;
  font-family: var(--font-mono);
  font-size: .66rem;
  letter-spacing: .2em;
  color: var(--copper);
}

.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}

.nav-list a {
  display: grid;
  grid-template-columns: 1.9rem 1fr .55rem;
  align-items: center;
  gap: .65rem;
  padding: .74rem 1.15rem .74rem 1.2rem;
  border-inline-start: 4px solid transparent;
  color: #A8B6C6;
  font-size: .9375rem;
  font-weight: 500;
  text-decoration: none;
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.nav-list a::before {
  content: attr(data-index);
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .06em;
  color: var(--copper);
  transition: color var(--dur) var(--ease);
}

.nav-list a::after {
  content: "";
  justify-self: end;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  opacity: 0;
  transition: opacity var(--dur) var(--ease);
}

.nav-list a:hover {
  color: var(--paper);
  background: rgba(79, 224, 208, .08);
  border-inline-start-color: rgba(214, 168, 95, .5);
}

.nav-list a:hover::after { opacity: .45; }

.nav-list a[aria-current="page"] {
  color: var(--paper);
  border-inline-start-color: var(--copper-bright);
  background: linear-gradient(90deg, rgba(79, 224, 208, .18), rgba(79, 224, 208, 0) 84%);
}

.nav-list a[aria-current="page"]::before { color: var(--cyan); }
.nav-list a[aria-current="page"]::after { opacity: 1; }

.rail__foot {
  margin-top: auto;
  padding: 1.1rem 1.2rem 1.6rem;
  border-top: 1px solid rgba(185, 138, 75, .32);
}

.rail__foot-label {
  font-family: var(--font-mono);
  font-size: .64rem;
  letter-spacing: .2em;
  color: var(--copper);
  margin-bottom: .3rem;
}

.rail__foot-mail {
  font-family: var(--font-mono);
  font-size: .78rem;
  line-height: 1.6;
  color: var(--paper);
  word-break: break-all;
}

.rail__foot-link {
  display: inline-block;
  margin-top: .85rem;
  padding-bottom: 2px;
  font-size: .83rem;
  font-weight: 500;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(79, 224, 208, .45);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.rail__foot-link:hover {
  color: var(--paper);
  border-bottom-color: var(--copper-bright);
}

/* ---------- footer ---------- */
.site-footer {
  margin-top: clamp(3rem, 7vw, 6rem);
  background: var(--ink-900);
  color: #A8B6C6;
  border-top: 3px solid var(--copper);
  font-size: .9375rem;
}

.footer__inner {
  width: 100%;
  max-width: var(--page-max);
  margin-inline: auto;
  padding: clamp(2rem, 4vw, 3.25rem) clamp(1.25rem, 4vw, 3rem) clamp(1.75rem, 3vw, 2.5rem);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.25rem;
}

.footer__identity { min-width: 0; }

.footer__brand {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(1.75rem, 3.4vw, 2.5rem);
  line-height: 1.12;
  letter-spacing: .03em;
  color: var(--paper);
}

.footer__descriptor {
  margin-top: .5rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .1em;
  line-height: 1.7;
  color: var(--cyan);
}

.footer__stamp {
  display: flex;
  align-items: center;
  gap: .6rem;
  margin-top: 1.35rem;
}

.footer__stamp-line {
  display: block;
  width: 34px;
  height: 2px;
  background: var(--copper);
}

.footer__stamp-text {
  font-family: var(--font-mono);
  font-size: .62rem;
  letter-spacing: .22em;
  color: var(--copper);
}

.footer__col { min-width: 0; }

.footer__col-title {
  margin-bottom: .95rem;
  font-family: var(--font-mono);
  font-size: .68rem;
  font-weight: 500;
  letter-spacing: .2em;
  color: var(--copper);
}

.footer__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .5rem;
}

.footer__list a {
  display: inline-block;
  padding-block: .1rem;
  color: #A8B6C6;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.footer__list a::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-inline-end: .55rem;
  background: var(--copper);
  opacity: .65;
  transition: background var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.footer__list a:hover {
  color: var(--paper);
  border-bottom-color: var(--cyan);
}

.footer__list a:hover::before {
  background: var(--cyan);
  opacity: 1;
}

.footer__contact {
  margin-top: clamp(1.75rem, 3vw, 2.5rem);
  padding: clamp(1.25rem, 2.5vw, 1.75rem) 0 0;
  border-top: 1px solid rgba(185, 138, 75, .32);
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.1rem;
}

.footer__contact-item { min-width: 0; }

.footer__contact-key {
  display: block;
  margin-bottom: .25rem;
  font-family: var(--font-mono);
  font-size: .64rem;
  letter-spacing: .2em;
  color: var(--copper);
}

.footer__contact-val {
  display: block;
  font-size: .875rem;
  line-height: 1.65;
  color: var(--paper);
}

.footer__contact-val--mono {
  font-family: var(--font-mono);
  font-size: .8125rem;
  letter-spacing: .02em;
  word-break: break-all;
}

.footer__base {
  background: var(--ink-800);
  border-top: 1px solid rgba(185, 138, 75, .32);
}

.footer__base-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: .5rem 1.5rem;
  width: 100%;
  max-width: var(--page-max);
  margin-inline: auto;
  padding: 1.05rem clamp(1.25rem, 4vw, 3rem) 1.2rem;
}

.footer__legal,
.footer__note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .03em;
  line-height: 1.8;
  color: #8C9AAB;
}

.footer__note { color: #7B8A9C; }

/* ---------- 通用容器与排版 ---------- */
.shell {
  width: 100%;
  max-width: var(--page-max);
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 4vw, 3rem);
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .22em;
  color: var(--copper);
}

.display {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.4rem, 5vw, 4.8rem);
  line-height: 1.06;
  letter-spacing: -.02em;
  color: var(--ink-900);
}

.title-serif {
  font-family: var(--font-serif);
  font-weight: 600;
  letter-spacing: .02em;
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .02em;
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .06em;
  color: var(--muted);
}

.breadcrumb ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
}

.breadcrumb li { display: inline-flex; gap: .4rem; }

.breadcrumb li + li::before {
  content: "/";
  color: var(--copper);
}

.breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.breadcrumb a:hover {
  color: var(--ink-900);
  border-bottom-color: var(--copper);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  padding: .8rem 1.3rem;
  border: 2px solid var(--ink-900);
  background: var(--ink-900);
  color: var(--paper);
  font-family: var(--font-display);
  font-size: .9375rem;
  font-weight: 500;
  letter-spacing: .02em;
  text-decoration: none;
  cursor: pointer;
  box-shadow: 4px 4px 0 rgba(11, 27, 43, .18);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.btn:hover {
  background: var(--copper-bright);
  border-color: var(--copper-bright);
  color: var(--ink-900);
  transform: translate(-2px, -2px);
  box-shadow: 7px 7px 0 rgba(11, 27, 43, .24);
}

.btn:active {
  transform: translate(1px, 1px);
  box-shadow: 2px 2px 0 rgba(11, 27, 43, .24);
}

.btn--ghost {
  background: transparent;
  color: var(--ink-900);
  box-shadow: none;
}

.btn--ghost:hover {
  background: var(--ink-900);
  border-color: var(--ink-900);
  color: var(--paper);
  box-shadow: none;
  transform: none;
}

.btn--signal {
  background: var(--ink-900);
  border-color: var(--cyan);
  color: var(--cyan);
}

.btn--signal:hover {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink-900);
}

/* ---------- 面板 ---------- */
.panel {
  padding: clamp(1.1rem, 2.2vw, 1.75rem);
  background: var(--cool);
  border: 2px solid var(--ink-800);
  box-shadow: var(--hard-shadow);
}

.panel--ink {
  background: var(--ink-900);
  border-color: var(--copper);
  color: var(--paper);
}

.panel--ink .eyebrow { color: var(--copper-bright); }

/* ---------- 图片容器基础规则 ---------- */
.figure { margin: 0; }

.figure__frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  border: 2px solid var(--ink-800);
  background:
    repeating-linear-gradient(135deg, rgba(100, 116, 139, .14) 0 2px, transparent 2px 9px),
    var(--ink-800);
  box-shadow: 8px 8px 0 rgba(11, 27, 43, .12);
}

.figure__frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.72) contrast(1.04) brightness(.97);
}

.figure__frame--tall { aspect-ratio: 4 / 5; }
.figure__frame--wide { aspect-ratio: 21 / 9; }

.figure__caption {
  margin-top: .6rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .04em;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 时长轴 ---------- */
.timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 1.5rem;
  border-inline-start: 2px solid var(--copper);
}

.timeline li {
  position: relative;
  padding-block: .95rem;
}

.timeline li::before {
  content: "";
  position: absolute;
  top: 1.6rem;
  inset-inline-start: calc(-1.5rem - 1px);
  width: 10px;
  height: 10px;
  background: var(--copper);
  border: 2px solid var(--paper);
  transform: translateX(-50%);
}

/* ---------- 折叠区 ---------- */
.fold {
  border: 2px solid var(--ink-800);
  background: var(--cool);
}

.fold > summary {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: .85rem 1.1rem;
  font-weight: 500;
  cursor: pointer;
  list-style: none;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

.fold > summary::-webkit-details-marker { display: none; }

.fold > summary::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--copper);
}

.fold[open] > summary::after { content: "–"; }

.fold > summary:hover { background: rgba(185, 138, 75, .16); }

.fold__body {
  padding: .25rem 1.1rem 1.1rem;
  border-top: 1px solid rgba(100, 116, 139, .32);
}

/* ---------- 表格 ---------- */
.table {
  width: 100%;
  border-collapse: collapse;
  font-size: .9375rem;
}

.table th,
.table td {
  padding: .7rem .85rem;
  text-align: start;
  vertical-align: top;
  border-bottom: 1px solid rgba(100, 116, 139, .3);
}

.table th {
  font-family: var(--font-mono);
  font-size: .72rem;
  font-weight: 500;
  letter-spacing: .1em;
  color: var(--muted);
  border-bottom: 2px solid var(--ink-800);
}

/* ---------- 标签与状态 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .18rem .5rem;
  border: 1px solid currentColor;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .1em;
  line-height: 1.6;
  color: var(--copper);
}

.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green);
  vertical-align: middle;
}

.status-dot--signal {
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(79, 224, 208, .18);
}

/* ---------- 栅格 ---------- */
.grid {
  display: grid;
  gap: clamp(1.25rem, 2.5vw, 2rem);
  grid-template-columns: minmax(0, 1fr);
}

/* ---------- 平板 ---------- */
@media (min-width: 700px) {
  .footer__contact { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .footer__grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .footer__identity { grid-column: 1 / -1; }
}

/* ---------- 桌面：左侧固定轨道 ---------- */
@media (min-width: 1024px) {
  body { padding-inline-start: var(--rail-w); }

  html { scroll-padding-block-start: 28px; }

  .progress-rail { left: var(--rail-w); }

  .site-header {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    width: var(--rail-w);
    border-bottom: 0;
    border-inline-end: 3px solid var(--copper);
  }

  .rail {
    height: 100%;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    padding: 0;
  }

  .rail__brand {
    gap: .7rem;
    padding: 1.7rem 1.25rem 1.5rem;
    border-bottom: 1px solid rgba(185, 138, 75, .3);
  }

  .rail__mark {
    width: 46px;
    height: 46px;
    font-size: 1.3rem;
  }

  .rail__brand-line { font-size: 1.08rem; }

  .rail__toggle { display: none; }

  .rail__nav {
    position: static;
    flex: 1;
    display: flex;
    width: auto;
    padding: 1.15rem 0 0;
    background: transparent;
    border-inline-end: 0;
    transform: none;
    visibility: visible;
    overflow-y: auto;
    overscroll-behavior: contain;
  }

  .rail__nav-label { padding-inline: 1.25rem; }

  .nav-list a { padding-inline: 1.25rem 1.1rem; }

  .rail__foot { padding-inline: 1.25rem; }

  .rail__foot-link { display: none; }

  .nav-scrim { display: none; }

  .footer__grid { grid-template-columns: 1.5fr repeat(3, minmax(0, 1fr)); }
  .footer__identity { grid-column: auto; }

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

@media (min-width: 860px) and (max-width: 1023px) {
  .grid--2,
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* ---------- 减少动态 ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
}