:root {
  --color-surface: #f3f3f2;
  --color-surface-alt: #ebeae9;
  --color-surface-deep: #dfdedc;
  --color-ink: #4c433e;
  --color-ink-soft: #746962;
  --color-ink-muted: #897d76;
  --color-line: #d5d3d2;
  --color-primary: #b55f2b;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #eaded6;
  --color-accent: #7d740c;
  --color-accent-ink: #ffffff;
  --color-highlight: #dedcc9;
  --color-focus: #756c05;
  --color-contrast-surface: #1d1511;
  --color-contrast-ink: #e7e5e4;
  --color-contrast-line: #49433f;
  --color-contrast-accent: #e8d717;
  --overlay-scrim: linear-gradient(180deg, rgba(29, 21, 17, 0.35) 0%, rgba(29, 21, 17, 0.72) 55%, rgba(29, 21, 17, 0.92) 100%);
  --font-heading: "Songti SC", "Source Han Serif SC", "Noto Serif SC", SimSun, serif;
  --font-body: "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, Menlo, Consolas, monospace;
  --text-xs: 13.7px;
  --text-sm: 16.4px;
  --text-base: 18px;
  --text-lg: 21.6px;
  --text-xl: 25.9px;
  --text-2xl: 31.1px;
  --text-3xl: 37.3px;
  --text-4xl: 44.8px;
  --text-display: clamp(34px, 6.5vw, 83px);
  --text-figure: clamp(28px, 4.7vw, 60px);
  --weight-heading: 680;
  --weight-body: 400;
  --leading-body: 1.86;
  --leading-heading: 1.26;
  --tracking-heading: -0.009em;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 21px;
  --radius-pill: 999px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: 0 6px 18px rgba(76, 67, 62, 0.08);
  --shadow-2: 0 18px 44px rgba(76, 67, 62, 0.14);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1120px;
  --measure: 68ch;
  --gutter: 24px;
  --section-y: 80px;
  --section-y-lg: 112px;
}

/* ============ RESET & BASE ============ */
*, *::before, *::after { box-sizing: border-box; }
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 152px;
}
body {
  margin: 0;
  background-color: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-body);
  line-height: var(--leading-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
h1, h2, h3, h4 {
  margin: 0 0 var(--space-3);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}
h1 { font-size: var(--text-4xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }
p { margin: 0 0 var(--space-3); max-width: var(--measure); }
p:last-child { margin-bottom: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}
img, svg { max-width: 100%; }
img { display: block; height: auto; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
strong { font-weight: 700; }
::selection { background-color: var(--color-primary-soft); color: var(--color-ink); }

/* ============ 布局容器 ============ */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.band { padding-block: var(--section-y); }
.band--lg { padding-block: var(--section-y-lg); }
.band--alt { background-color: var(--color-surface-alt); }
.band--deep { background-color: var(--color-surface-deep); }
.band--highlight { background-color: var(--color-highlight); }
.band--contrast {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.band--contrast h1, .band--contrast h2, .band--contrast h3, .band--contrast h4 { color: var(--color-contrast-ink); }
.band--contrast .section-lead, .band--contrast p { color: var(--color-contrast-ink); }
.band--contrast a { color: var(--color-contrast-accent); }

.panel {
  border-radius: var(--radius-lg);
  background-color: var(--color-surface-alt);
  padding: var(--space-4);
}
.panel--highlight { background-color: var(--color-highlight); }
.panel--deep { background-color: var(--color-surface-deep); }
.panel--contrast {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.panel--contrast h2, .panel--contrast h3, .panel--contrast h4 { color: var(--color-contrast-ink); }
.panel--contrast p { color: var(--color-contrast-ink); }
.texture-paper {
  background-image: repeating-linear-gradient(
    0deg,
    color-mix(in srgb, var(--color-ink) 3%, transparent) 0 1px,
    transparent 1px 4px
  );
}
.stack-sm > * + * { margin-top: var(--space-1); }
.stack-md > * + * { margin-top: var(--space-3); }

.grid { display: grid; gap: var(--gutter); }
.grid--7-5 { grid-template-columns: 7fr 5fr; }
.grid--8-4 { grid-template-columns: 8fr 4fr; }
.grid--5-7 { grid-template-columns: 5fr 7fr; }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

/* ============ 标题组 ============ */
.section-head {
  display: grid;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
  max-width: var(--measure);
}
.section-eyebrow {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-primary);
}
.section-title { font-size: var(--text-3xl); margin: 0; }
.section-lead { margin: 0; color: var(--color-ink-soft); }
.hero-title {
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 1.08;
  letter-spacing: var(--tracking-heading);
  margin: 0 0 var(--space-3);
}
.figure {
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-variant-numeric: tabular-nums;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-accent);
  margin: 0;
}
.mono {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-variant-numeric: tabular-nums;
}
.meta {
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  line-height: 1.6;
}

/* ============ 强调机制 ============ */
.emphasis {
  border-left: 3px solid var(--color-primary);
  background-color: var(--color-primary-soft);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: var(--space-3) var(--space-4);
}
.emphasis p:last-child { margin-bottom: 0; }

/* ============ 按钮 ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  padding: 11px 22px;
  border-radius: var(--radius-pill);
  border: var(--border-thin) solid transparent;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  line-height: 1.4;
  text-decoration: none;
  transition: background-color 200ms ease-out, color 200ms ease-out, border-color 200ms ease-out;
}
.btn:hover { text-decoration: none; }
.btn--primary { background-color: var(--color-primary); color: var(--color-primary-ink); }
.btn--primary:hover { background-color: color-mix(in srgb, var(--color-primary) 84%, var(--color-contrast-surface)); }
.btn--accent { background-color: var(--color-accent); color: var(--color-accent-ink); }
.btn--accent:hover { background-color: color-mix(in srgb, var(--color-accent) 84%, var(--color-contrast-surface)); }
.btn--ghost {
  background-color: transparent;
  border-color: var(--color-line);
  color: var(--color-ink);
}
.btn--ghost:hover { background-color: var(--color-primary-soft); border-color: var(--color-primary); color: var(--color-ink); }
.btn--block { width: 100%; }

/* ============ 标签 / 状态点 / 过滤 ============ */
.tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  background-color: var(--color-surface-alt);
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: 1.6;
  white-space: nowrap;
}
.tag--channel { background-color: var(--color-primary); color: var(--color-primary-ink); }
.tag--accent {
  background-color: color-mix(in srgb, var(--color-accent) 16%, var(--color-surface));
  color: var(--color-accent);
}
.status-dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--color-accent);
  flex: none;
}
.status-dot--live { background-color: var(--color-contrast-accent); }

.chip-row { display: flex; flex-wrap: wrap; gap: var(--space-1); }
.chip {
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  background-color: var(--color-surface-alt);
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  transition: background-color 200ms ease-out, color 200ms ease-out;
}
.chip:hover { background-color: var(--color-primary-soft); color: var(--color-ink); }
.chip[aria-pressed="true"] { background-color: var(--color-primary); color: var(--color-primary-ink); }

/* ============ 字段清单 ============ */
.data-list { display: grid; gap: 2px; }
.data-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: baseline;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-2);
  border-radius: var(--radius-sm);
}
.data-row:nth-child(even) { background-color: var(--color-surface-alt); }
.data-key { font-size: var(--text-sm); color: var(--color-ink-soft); }
.data-value {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-variant-numeric: tabular-nums;
  color: var(--color-ink);
}
.meta-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

/* ============ 展开组 ============ */
.expand-group {
  border-radius: var(--radius-lg);
  background-color: var(--color-surface-alt);
  padding: var(--space-2) var(--space-2);
}
.expand-item { border-radius: var(--radius-md); }
.expand-item + .expand-item { margin-top: var(--space-1); }
.expand-trigger {
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  text-align: left;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
  transition: background-color 200ms ease-out, color 200ms ease-out;
}
.expand-trigger:hover { background-color: var(--color-primary-soft); }
.expand-trigger[aria-expanded="true"] { background-color: var(--color-primary); color: var(--color-primary-ink); }
.expand-trigger::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  line-height: 1;
  color: var(--color-primary);
  transition: transform 200ms ease-out;
}
.expand-trigger[aria-expanded="true"]::after { content: "–"; color: var(--color-primary-ink); }
.expand-panel {
  display: grid;
  grid-template-rows: 0fr;
  opacity: 0;
  transition: grid-template-rows 240ms ease-out, opacity 200ms ease-out;
}
.expand-panel[data-open] { grid-template-rows: 1fr; opacity: 1; }
.expand-inner { overflow: hidden; }
.expand-inner > * { padding-top: var(--space-2); }

/* ============ 图片容器 ============ */
.frame {
  position: relative;
  display: block;
  border-radius: var(--radius-lg);
  padding: 8px;
  background-color: var(--color-surface-alt);
  box-shadow: var(--shadow-1);
  overflow: hidden;
}
.frame img { width: 100%; border-radius: var(--radius-md); object-fit: cover; }
.frame--wide { aspect-ratio: 16 / 7; }
.frame--square { aspect-ratio: 4 / 3; }
.frame--tall { aspect-ratio: 3 / 4; }
.frame--photo { background-color: var(--color-surface); }
.frame--photo img { border-radius: calc(var(--radius-md) - 4px); }
.frame-grid::after {
  content: "";
  position: absolute;
  inset: 8px;
  border-radius: var(--radius-md);
  pointer-events: none;
  background-image:
    repeating-linear-gradient(90deg, color-mix(in srgb, var(--color-contrast-ink) 22%, transparent) 0 1px, transparent 1px 56px),
    repeating-linear-gradient(0deg, color-mix(in srgb, var(--color-contrast-ink) 22%, transparent) 0 1px, transparent 1px 56px);
  mix-blend-mode: overlay;
}
.frame-overlay {
  position: absolute;
  inset: 8px;
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: var(--space-1);
  padding: var(--space-4);
  background: var(--overlay-scrim);
  color: var(--color-contrast-ink);
}
.frame-overlay h2, .frame-overlay h3 { color: var(--color-contrast-ink); margin: 0; }
.frame-caption {
  margin: var(--space-2) 0 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

/* ============ 面包屑 ============ */
.breadcrumbs { padding-block: var(--space-3); }
.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}
.breadcrumbs li { display: flex; align-items: center; gap: var(--space-1); }
.breadcrumbs li + li::before { content: "/"; color: var(--color-ink-muted); }
.breadcrumbs a { color: var(--color-ink-soft); }

/* ============ SKIP LINK ============ */
.skip-link {
  position: absolute;
  left: var(--gutter);
  top: -80px;
  z-index: 90;
  padding: 10px 20px;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  font-size: var(--text-sm);
  transition: top 200ms ease-out;
}
.skip-link:hover { text-decoration: none; }
.skip-link:focus { top: 0; }

/* ============ HEADER ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background-color: var(--color-surface);
  border-bottom: var(--border-thin) solid var(--color-line);
}
.header-band {
  display: flex;
  gap: 3px;
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--space-1) var(--gutter) 0;
}
.band-seg { height: 6px; border-radius: var(--radius-pill); }
.band-seg--deep { flex: 5 1 0; background-color: var(--color-contrast-surface); }
.band-seg--primary { flex: 3 1 0; background-color: var(--color-primary); }
.band-seg--accent { flex: 2 1 0; background-color: var(--color-accent); }
.band-seg--gold { flex: 1 1 0; background-color: var(--color-contrast-accent); }

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding-block: var(--space-2);
}
.brand-lockup { display: flex; align-items: baseline; gap: var(--space-2); min-width: 0; }
.brand {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  line-height: 1.2;
  color: var(--color-ink);
  white-space: nowrap;
}
.brand:hover { color: var(--color-primary); text-decoration: none; }
.brand-page {
  padding-left: var(--space-2);
  border-left: var(--border-thin) solid var(--color-line);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  white-space: nowrap;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: var(--space-1);
  padding: 9px 16px;
  border-radius: var(--radius-pill);
  background-color: var(--color-surface-alt);
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  transition: background-color 200ms ease-out, color 200ms ease-out;
}
.nav-toggle:hover { background-color: var(--color-primary-soft); color: var(--color-ink); }
.nav-toggle[aria-expanded="true"] { background-color: var(--color-primary); color: var(--color-primary-ink); }
.nav-toggle-mark { position: relative; width: 14px; height: 9px; flex: none; }
.nav-toggle-mark::before,
.nav-toggle-mark::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  border-radius: 2px;
  background-color: currentColor;
  transition: transform 200ms ease-out, top 200ms ease-out, bottom 200ms ease-out;
}
.nav-toggle-mark::before { top: 1px; }
.nav-toggle-mark::after { bottom: 1px; }
.nav-toggle[aria-expanded="true"] .nav-toggle-mark::before { top: 3px; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-mark::after { bottom: 4px; transform: rotate(-45deg); }

.site-nav { display: flex; }
.nav-list { display: flex; align-items: center; gap: 2px; flex-wrap: wrap; }
.nav-link {
  display: block;
  padding: 9px 15px;
  border-radius: var(--radius-sm);
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  line-height: 1.4;
  transition: background-color 200ms ease-out, color 200ms ease-out;
}
.nav-link:hover { background-color: var(--color-primary-soft); color: var(--color-ink); text-decoration: none; }
.nav-link[aria-current="page"] { background-color: var(--color-primary); color: var(--color-primary-ink); }

.header-utility {
  border-top: var(--border-thin) solid var(--color-line);
  background-color: var(--color-surface-alt);
}
.header-utility-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding-block: 7px;
}
.utility-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-soft);
}
.utility-link:hover { color: var(--color-primary); text-decoration: none; }
.utility-text { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.utility-meta { font-size: var(--text-xs); color: var(--color-ink-muted); white-space: nowrap; }

.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background-color: var(--color-primary);
}

/* ============ FOOTER ============ */
.site-footer {
  margin-top: var(--section-y);
  background-color: var(--color-surface-deep);
  color: var(--color-ink);
}
.footer-ruler {
  height: 14px;
  border-top: var(--border-thin) solid var(--color-line);
  background-image: repeating-linear-gradient(
    90deg,
    var(--color-line) 0 1px,
    transparent 1px 28px
  );
}
.footer-inner { padding-block: var(--space-8) var(--space-6); }
.footer-top {
  display: grid;
  grid-template-columns: 1.5fr 2.8fr;
  gap: var(--space-8);
}
.footer-brand {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}
.footer-tagline { margin: 0 0 var(--space-3); max-width: 34ch; color: var(--color-ink-soft); }
.footer-version { margin: 0; font-size: var(--text-xs); color: var(--color-ink-muted); }
.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
}
.footer-col-title {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  letter-spacing: 0.02em;
  color: var(--color-primary);
}
.footer-list { display: grid; gap: 6px; }
.footer-list a { color: var(--color-ink-soft); font-size: var(--text-sm); }
.footer-list a:hover { color: var(--color-primary); }
.footer-contact {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
  margin-top: var(--space-6);
  padding-top: var(--space-4);
  border-top: var(--border-thin) solid var(--color-line);
}
.footer-contact-item {
  margin: 0;
  max-width: none;
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-soft);
}
.footer-contact-label {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}
.footer-base {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-2);
  padding-block: var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}
.footer-legal { max-width: 62ch; }

/* ============ 响应式 ============ */
@media (max-width: 980px) {
  .grid--7-5, .grid--8-4, .grid--5-7, .grid--3 { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; gap: var(--space-6); }
  .footer-contact { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 880px) {
  .nav-toggle { display: inline-flex; }
  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    padding: var(--space-2) var(--gutter) var(--space-3);
    background-color: var(--color-surface);
    border-top: var(--border-thin) solid var(--color-line);
    border-bottom: var(--border-thin) solid var(--color-line);
    box-shadow: var(--shadow-2);
  }
  .site-nav[data-open] { display: block; }
  .nav-list { flex-direction: column; align-items: stretch; gap: 2px; }
  .nav-link { padding: 12px var(--space-3); font-size: var(--text-base); }
  .header-inner { padding-block: var(--space-2) var(--space-2); }
  .brand { font-size: var(--text-lg); }
  .band-seg--deep { flex: 3 1 0; }
}

@media (max-width: 640px) {
  .band { padding-block: var(--space-8); }
  .band--lg { padding-block: var(--space-8); }
  .panel { padding: var(--space-3); }
  .grid--2 { grid-template-columns: 1fr; }
  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-contact { grid-template-columns: 1fr; }
  .brand-page { display: none; }
  .utility-meta { display: none; }
  .header-utility-inner { justify-content: flex-start; }
}

/* ============ 动效克制 ============ */
@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;
    transition-delay: 0ms !important;
  }
}