:root {
  --color-surface: #ecebea;
  --color-surface-alt: #e4e2e1;
  --color-surface-deep: #d8d6d5;
  --color-ink: #48403c;
  --color-ink-soft: #6e635e;
  --color-ink-muted: #897c76;
  --color-line: #cecccb;
  --color-primary: #b75c33;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #e5d7d0;
  --color-accent: #e80d1a;
  --color-accent-ink: #ffffff;
  --color-highlight: #ebc3c5;
  --color-focus: #d0010d;
  --color-contrast-surface: #1b1410;
  --color-contrast-ink: #e7e5e4;
  --color-contrast-line: #48423f;
  --color-contrast-accent: #f32b36;
  --overlay-scrim: linear-gradient(180deg, rgba(27, 20, 16, 0.35) 0%, rgba(27, 20, 16, 0.72) 55%, rgba(27, 20, 16, 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: 11.0px;
  --text-sm: 14.7px;
  --text-base: 17px;
  --text-lg: 22.7px;
  --text-xl: 30.2px;
  --text-2xl: 40.3px;
  --text-3xl: 53.7px;
  --text-4xl: 71.5px;
  --text-display: clamp(38px, 7.9vw, 101px);
  --text-figure: clamp(32px, 5.7vw, 73px);
  --weight-heading: 652;
  --weight-body: 400;
  --leading-body: 1.8;
  --leading-heading: 1.24;
  --tracking-heading: 0.006em;
  --radius-sm: 11px;
  --radius-md: 16px;
  --radius-lg: 21px;
  --radius-pill: 999px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: 0 6px 18px rgba(72, 64, 60, 0.08);
  --shadow-2: 0 18px 44px rgba(72, 64, 60, 0.14);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1160px;
  --measure: 67ch;
  --gutter: 24px;
  --section-y: 110px;
  --section-y-lg: 154px;
}

/* ==========================================================================
   reset
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
}

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

ul, ol { padding: 0; }

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

button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; padding: 0; }

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

[hidden] { display: none !important; }

/* ==========================================================================
   基础排版
   ========================================================================== */

body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-body);
  line-height: var(--leading-body);
  color: var(--color-ink);
  background-color: var(--color-surface);
  background-image:
    radial-gradient(120% 78% at 10% 0%, color-mix(in srgb, var(--color-primary) 7%, transparent) 0%, transparent 58%),
    radial-gradient(110% 70% at 100% 90%, color-mix(in srgb, var(--color-accent) 4%, transparent) 0%, transparent 62%);
  background-attachment: fixed;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  text-wrap: balance;
}

h1 { font-size: var(--text-3xl); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }
h5 { font-size: var(--text-base); }
h6 { font-size: var(--text-sm); }

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

strong, b { font-weight: 650; }

::selection {
  background: var(--color-highlight);
  color: var(--color-ink);
}

/* ==========================================================================
   无障碍
   ========================================================================== */

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

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: 50%;
  top: 0;
  z-index: 200;
  transform: translate(-50%, -160%);
  padding: 12px 24px;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  background: var(--color-primary);
  color: var(--color-primary-ink);
  font-size: var(--text-sm);
  font-weight: 600;
  box-shadow: var(--shadow-2);
  transition: transform 0.22s ease;
}

.skip-link:focus {
  transform: translate(-50%, 0);
}

/* ==========================================================================
   布局骨架
   ========================================================================== */

.container {
  width: 100%;
  max-width: calc(var(--container) + var(--gutter) * 2);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  padding-block: clamp(56px, 9vw, var(--section-y));
}

.section--lg {
  padding-block: clamp(72px, 11vw, var(--section-y-lg));
}

.section--tight {
  padding-block: clamp(32px, 5vw, var(--space-6));
}

.grid {
  display: grid;
  gap: var(--gutter);
  grid-template-columns: repeat(12, minmax(0, 1fr));
}

.grid > * { grid-column: span 12; min-width: 0; }

.col-4, .col-5, .col-6, .col-7, .col-8 { grid-column: span 12; }

@media (min-width: 900px) {
  .col-4 { grid-column: span 4; }
  .col-5 { grid-column: span 5; }
  .col-6 { grid-column: span 6; }
  .col-7 { grid-column: span 7; }
  .col-8 { grid-column: span 8; }
  .col-offset-1 { grid-column-start: 2; }
  .col-offset-2 { grid-column-start: 3; }
}

/* ==========================================================================
   页首区块
   ========================================================================== */

.page-head {
  padding-block: clamp(40px, 7vw, 88px) clamp(20px, 3vw, 40px);
}

.page-head__inner { display: grid; gap: var(--space-2); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--color-primary);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  border-radius: 2px;
  background: var(--color-primary);
}

.page-title {
  font-size: clamp(30px, 5vw, var(--text-3xl));
  max-width: 22ch;
}

.page-title--display {
  font-size: var(--text-display);
  line-height: 1.08;
  letter-spacing: -0.01em;
  max-width: 16ch;
}

.page-head__sub {
  font-size: var(--text-lg);
  line-height: 1.7;
  color: var(--color-ink-soft);
  max-width: var(--measure);
}

.breadcrumb {
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

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

.breadcrumb a { transition: color 0.18s ease; }
.breadcrumb a:hover { color: var(--color-primary); }

/* ==========================================================================
   正文
   ========================================================================== */

.prose { max-width: var(--measure); }
.prose > * + * { margin-top: var(--space-2); }
.prose h2 { font-size: var(--text-2xl); margin-top: var(--space-4); }
.prose h3 { font-size: var(--text-xl); margin-top: var(--space-3); }
.prose ul, .prose ol { padding-left: 1.4em; }
.prose li { list-style: disc; margin-bottom: 6px; }
.prose ol li { list-style: decimal; }
.prose li::marker { color: var(--color-primary); }

.lead {
  font-size: var(--text-lg);
  line-height: 1.72;
  color: var(--color-ink-soft);
  max-width: var(--measure);
}

.text-link {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color 0.18s ease;
}

.text-link:hover { color: var(--color-accent); }

.muted { color: var(--color-ink-muted); }
.small { font-size: var(--text-sm); }

/* ==========================================================================
   面板 / 框体
   ========================================================================== */

.panel {
  position: relative;
  display: block;
  padding: var(--space-4);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--color-surface-alt);
  overflow: hidden;
}

.panel--flat { background: var(--color-surface); }
.panel--raised { box-shadow: var(--shadow-2); }
.panel--soft { box-shadow: var(--shadow-1); }

.panel--warm {
  background: var(--color-primary-soft);
  border-color: color-mix(in srgb, var(--color-primary) 26%, var(--color-line));
}

.panel--dark,
.on-dark {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-color: var(--color-contrast-line);
}

:is(.panel--dark, .on-dark) :is(h1, h2, h3, h4, h5, h6) { color: var(--color-contrast-ink); }
:is(.panel--dark, .on-dark) :is(.lead, .muted, p) { color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent); }
:is(.panel--dark, .on-dark) :is(.num, .figure, .stat__value) { color: var(--color-contrast-accent); }
:is(.panel--dark, .on-dark) .stat__label { color: color-mix(in srgb, var(--color-contrast-ink) 58%, transparent); }
:is(.panel--dark, .on-dark) .tag--outline { border-color: var(--color-contrast-line); color: var(--color-contrast-ink); }
:is(.panel--dark, .on-dark) .text-link { color: var(--color-contrast-accent); }
:is(.panel--dark, .on-dark) :is(td, th) { border-color: var(--color-contrast-line); }

.panel__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.panel__title { font-size: var(--text-lg); }

.texture-paper::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  opacity: 0.7;
  background-image:
    repeating-linear-gradient(45deg, color-mix(in srgb, var(--color-ink) 3%, transparent) 0 1px, transparent 1px 4px),
    repeating-linear-gradient(-45deg, color-mix(in srgb, var(--color-ink) 2%, transparent) 0 1px, transparent 1px 6px);
}

/* ==========================================================================
   徽标 / 标签
   ========================================================================== */

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  background: var(--color-highlight);
  color: color-mix(in srgb, var(--color-ink) 92%, #000);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  line-height: 1.7;
  white-space: nowrap;
}

.tag--primary { background: var(--color-primary); color: var(--color-primary-ink); }
.tag--accent { background: var(--color-accent); color: var(--color-accent-ink); }

.tag--outline {
  background: transparent;
  border: var(--border-thin) solid var(--color-line);
  color: var(--color-ink-soft);
}

.tag--square { border-radius: var(--radius-sm); }
.tag--pillflag { border-radius: var(--radius-pill) var(--radius-sm) var(--radius-pill) var(--radius-pill); }
.tag--notch { border-radius: var(--radius-sm) var(--radius-sm) var(--radius-sm) 0; }
.tag--dark {
  background: color-mix(in srgb, var(--color-contrast-accent) 22%, transparent);
  color: var(--color-contrast-accent);
}

/* ==========================================================================
   按钮
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 46px;
  padding: 11px 22px;
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-pill);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 600;
  line-height: 1.4;
  cursor: pointer;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease,
              transform 0.18s ease, box-shadow 0.18s ease;
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-primary-ink);
  box-shadow: var(--shadow-1);
}

.btn--primary:hover {
  background: color-mix(in srgb, var(--color-primary) 84%, #000);
  transform: translateY(-2px);
  box-shadow: var(--shadow-2);
}

.btn--ghost {
  background: transparent;
  border-color: var(--color-line);
  color: var(--color-ink);
}

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

.btn--accent {
  background: var(--color-accent);
  color: var(--color-accent-ink);
}

.btn--accent:hover { background: color-mix(in srgb, var(--color-accent) 84%, #000); }

.btn--sm {
  min-height: 36px;
  padding: 6px 16px;
  font-size: var(--text-sm);
}

/* ==========================================================================
   数据
   ========================================================================== */

.num,
.figure {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--color-accent);
}

.num { font-size: 1em; font-weight: 700; }

.figure {
  font-size: var(--text-figure);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
}

.stat { display: grid; gap: 6px; align-content: start; }

.stat__label {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--color-ink-muted);
}

.stat__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-figure);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-accent);
}

.stat--sm .stat__value { font-size: var(--text-2xl); }
.stat__note { font-size: var(--text-sm); color: var(--color-ink-soft); line-height: 1.7; }

.table-scroll {
  overflow-x: auto;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

.data-table {
  width: 100%;
  min-width: 520px;
  font-size: var(--text-sm);
}

.data-table caption {
  caption-side: top;
  text-align: left;
  padding: 12px 16px;
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
}

.data-table th {
  background: var(--color-primary-soft);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 650;
  text-align: left;
  padding: 12px 16px;
  border-bottom: var(--border-thin) solid var(--color-line);
  white-space: nowrap;
}

.data-table td {
  padding: 12px 16px;
  border-bottom: var(--border-thin) solid var(--color-line);
  color: var(--color-ink-soft);
  vertical-align: top;
}

.data-table tbody tr:nth-child(even) { background: color-mix(in srgb, var(--color-surface-deep) 55%, transparent); }
.data-table tbody tr:last-child td { border-bottom: 0; }
.data-table .is-number { text-align: right; font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

/* ==========================================================================
   媒体容器
   ========================================================================== */

.media {
  position: relative;
  overflow: hidden;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  background-color: var(--color-surface-deep);
  background-image: linear-gradient(135deg,
    color-mix(in srgb, var(--color-surface-deep) 88%, var(--color-primary-soft)) 0%,
    color-mix(in srgb, var(--color-primary-soft) 62%, var(--color-surface-deep)) 100%);
}

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

.media--pano { aspect-ratio: 21 / 9; }
.media--wide { aspect-ratio: 16 / 9; }
.media--square { aspect-ratio: 1 / 1; }
.media--tall { aspect-ratio: 3 / 4; }
.media--narrow { aspect-ratio: 9 / 16; }

.media__scrim {
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
}

.media__caption {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  z-index: 2;
  padding: var(--space-3);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  line-height: 1.6;
}

.media__badge {
  position: absolute;
  left: var(--space-3);
  top: var(--space-3);
  z-index: 2;
}

/* ==========================================================================
   折叠面板
   ========================================================================== */

.disclosure {
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface-alt);
  overflow: hidden;
}

.disclosure + .disclosure { margin-top: var(--space-1); }
.disclosure[data-open] { border-color: color-mix(in srgb, var(--color-primary) 34%, var(--color-line)); }

.disclosure__btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: 16px var(--space-3);
  text-align: left;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: 1.4;
  color: var(--color-ink);
  cursor: pointer;
  transition: background-color 0.18s ease;
}

.disclosure__btn:hover { background: color-mix(in srgb, var(--color-primary) 8%, transparent); }

.disclosure__icon {
  position: relative;
  flex: none;
  width: 26px; height: 26px;
  border-radius: 50%;
  background: var(--color-primary-soft);
  transition: background-color 0.18s ease;
}

.disclosure__icon::before,
.disclosure__icon::after {
  content: "";
  position: absolute;
  left: 50%; top: 50%;
  translate: -50% -50%;
  background: var(--color-primary);
  border-radius: 2px;
}

.disclosure__icon::before { width: 11px; height: 2px; }
.disclosure__icon::after { width: 2px; height: 11px; transition: scale 0.22s ease; }
.disclosure[data-open] .disclosure__icon { background: var(--color-primary); }
.disclosure[data-open] .disclosure__icon::before,
.disclosure[data-open] .disclosure__icon::after { background: var(--color-primary-ink); }
.disclosure[data-open] .disclosure__icon::after { scale: 1 0; }

.disclosure__body {
  padding: 0 var(--space-3) var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
  margin-top: 0;
  padding-top: var(--space-3);
}

.disclosure__body > * + * { margin-top: var(--space-2); }

/* ==========================================================================
   筛选
   ========================================================================== */

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin-bottom: var(--space-3);
}

.filter-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--color-surface);
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  font-weight: 600;
  line-height: 1.5;
  cursor: pointer;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.filter-chip:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.filter-chip[aria-pressed="true"] {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}

[data-filter-item] { transition: opacity 0.24s ease; }
[data-filter-item].is-entering { opacity: 0; }

/* ==========================================================================
   站点头部
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: color-mix(in srgb, var(--color-surface) 94%, transparent);
  -webkit-backdrop-filter: saturate(130%) blur(10px);
  backdrop-filter: saturate(130%) blur(10px);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.header-bar {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  width: 100%;
  max-width: calc(var(--container) + var(--gutter) * 2);
  margin-inline: auto;
  padding: 10px var(--gutter);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  margin-right: auto;
}

.brand__mark {
  flex: none;
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  line-height: 1;
  box-shadow: var(--shadow-1);
}

.brand__text { display: grid; min-width: 0; }

.brand__name {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: 1.15;
  letter-spacing: var(--tracking-heading);
  white-space: nowrap;
}

.brand__tag {
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-ink-muted);
  white-space: nowrap;
}

.header-now {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  border: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 30%, transparent);
  border-radius: var(--radius-pill);
  background: var(--color-primary-soft);
  font-size: var(--text-sm);
  line-height: 1.4;
  white-space: nowrap;
  transition: background-color 0.18s ease, border-color 0.18s ease;
}

.header-now:hover { background: color-mix(in srgb, var(--color-primary) 22%, var(--color-primary-soft)); }
.header-now__label { color: var(--color-primary); font-weight: 650; }

.header-now__value {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-soft);
  letter-spacing: 0.02em;
}

@media (min-width: 460px) {
  .header-now { display: inline-flex; }
}

.nav-toggle {
  flex: none;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 8px 15px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--color-surface-alt);
  color: var(--color-ink);
  font-size: var(--text-sm);
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}

.nav-toggle__bars {
  display: grid;
  gap: 4px;
  width: 16px;
}

.nav-toggle__bars i {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: var(--color-primary);
  transition: transform 0.22s ease, opacity 0.18s ease, background-color 0.18s ease;
}

.site-header[data-open] .nav-toggle {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}

.site-header[data-open] .nav-toggle__bars i { background: var(--color-primary-ink); }
.site-header[data-open] .nav-toggle__bars i:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.site-header[data-open] .nav-toggle__bars i:nth-child(2) { opacity: 0; }
.site-header[data-open] .nav-toggle__bars i:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* --- 移动端抽屉 --- */

.site-nav {
  max-height: 0;
  overflow: hidden;
  visibility: hidden;
  opacity: 0;
  border-top: var(--border-thin) solid transparent;
  background: var(--color-surface-alt);
  transition: max-height 0.34s ease, opacity 0.22s ease, visibility 0.34s ease;
}

.site-header[data-open] .site-nav {
  max-height: min(74vh, 540px);
  overflow-y: auto;
  visibility: visible;
  opacity: 1;
  border-top-color: var(--color-line);
  box-shadow: var(--shadow-2);
}

.nav-list {
  list-style: none;
  display: grid;
  gap: 4px;
  padding: var(--space-2) var(--gutter);
}

.nav-link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 14px;
  border-radius: var(--radius-sm);
  color: var(--color-ink-soft);
  font-size: var(--text-base);
  line-height: 1.5;
  transition: background-color 0.18s ease, color 0.18s ease;
}

.nav-link__dot {
  flex: none;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--color-line);
  transition: background-color 0.18s ease, box-shadow 0.18s ease, scale 0.18s ease;
}

.nav-link:hover {
  background: color-mix(in srgb, var(--color-primary) 12%, transparent);
  color: var(--color-ink);
}

.nav-link:hover .nav-link__dot { background: var(--color-primary); }

.nav-link[aria-current="page"] {
  background: var(--color-primary-soft);
  color: var(--color-ink);
  font-weight: 650;
}

.nav-link[aria-current="page"] .nav-link__dot {
  background: var(--color-primary);
  scale: 1.22;
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--color-primary) 20%, transparent);
}

.nav-rail__note {
  margin: 0 var(--gutter) var(--space-3);
  padding-top: var(--space-2);
  border-top: var(--border-thin) solid var(--color-line);
  font-size: var(--text-xs);
  line-height: 1.9;
  color: var(--color-ink-muted);
}

/* --- 滚动进度 --- */

.rail-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: color-mix(in srgb, var(--color-line) 65%, transparent);
  pointer-events: none;
}

.rail-progress__bar {
  display: block;
  width: var(--progress, 0%);
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  transition: width 0.1s linear;
}

/* --- 桌面端侧边轨道 --- */

@media (min-width: 1024px) {
  body { padding-left: 268px; }

  .site-header {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 268px;
    display: flex;
    flex-direction: column;
    border-bottom: 0;
    border-right: var(--border-thin) solid var(--color-line);
    background: var(--color-surface-alt);
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
  }

  .header-bar {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-3);
    padding: var(--space-4) var(--space-3) var(--space-2);
    max-width: none;
    margin: 0;
  }

  .brand { margin-right: 0; }

  .header-now {
    display: flex;
    justify-content: space-between;
    margin-left: 0;
  }

  .nav-toggle { display: none; }

  .site-nav {
    flex: 1 1 auto;
    min-height: 0;
    max-height: none;
    overflow-y: auto;
    visibility: visible;
    opacity: 1;
    background: transparent;
    border-top: 0;
    box-shadow: none;
    transition: none;
  }

  .nav-list {
    position: relative;
    padding: 0 var(--space-2) var(--space-2) var(--space-3);
    gap: 4px;
  }

  .nav-list::before {
    content: "";
    position: absolute;
    left: 21px;
    top: 16px;
    bottom: 28px;
    width: 1px;
    background: var(--color-line);
  }

  .nav-link { background: transparent; }

  .nav-link__dot {
    position: relative;
    z-index: 1;
    box-shadow: 0 0 0 5px var(--color-surface-alt);
  }

  .nav-link[aria-current="page"] { background: var(--color-primary-soft); }

  .nav-rail__note { margin-inline: var(--space-3); }

  .rail-progress {
    left: auto;
    right: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    height: auto;
    background: color-mix(in srgb, var(--color-line) 55%, transparent);
  }

  .rail-progress__bar {
    width: 100%;
    height: var(--progress, 0%);
    background: linear-gradient(180deg, var(--color-primary), var(--color-accent));
    transition: height 0.1s linear;
  }
}

/* ==========================================================================
   站点页脚
   ========================================================================== */

.site-footer {
  margin-top: clamp(48px, 8vw, var(--space-8));
  padding-block: clamp(48px, 7vw, 96px) var(--space-4);
  border-top: var(--border-thin) solid var(--color-line);
  background: color-mix(in srgb, var(--color-surface-alt) 62%, var(--color-surface));
}

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

@media (min-width: 700px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-3); }
  .footer-panel--lines { grid-column: span 2; }
}

@media (min-width: 1024px) {
  .footer-grid { grid-template-columns: repeat(12, minmax(0, 1fr)); }
  .footer-panel--brand { grid-column: span 3; }
  .footer-panel--lines { grid-column: span 4; }
  .footer-panel--help { grid-column: span 2; }
  .footer-panel--contact { grid-column: span 3; }
}

.footer-panel {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  box-shadow: var(--shadow-1);
}

.footer-panel__kicker {
  font-size: var(--text-xs);
  font-weight: 650;
  letter-spacing: 0.18em;
  color: var(--color-ink-muted);
}

.footer-panel__brand {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: 1.22;
  color: var(--color-ink);
}

.footer-panel__text {
  font-size: var(--text-sm);
  line-height: 1.75;
  color: var(--color-ink-soft);
}

.footer-panel__meta {
  margin-top: auto;
  padding-top: var(--space-2);
  border-top: var(--border-thin) solid var(--color-line);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.02em;
  color: var(--color-ink-muted);
}

.footer-panel__note {
  font-size: var(--text-xs);
  line-height: 1.8;
  color: var(--color-ink-soft);
}

.line-list {
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-1);
}

@media (min-width: 420px) {
  .line-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

.line-chip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 11px 14px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface-alt);
  font-size: var(--text-sm);
  font-weight: 650;
  color: var(--color-ink);
  transition: background-color 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
}

.line-chip::after {
  content: "\2192";
  color: var(--color-primary);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
}

.line-chip:hover {
  background: var(--color-primary-soft);
  border-color: color-mix(in srgb, var(--color-primary) 32%, transparent);
  transform: translateX(2px);
}

.footer-links {
  list-style: none;
  display: grid;
  gap: 10px;
}

.footer-links a {
  display: inline-block;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  border-bottom: var(--border-thin) solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.footer-links a:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.footer-panel--contact {
  background: var(--color-primary-soft);
  border-color: color-mix(in srgb, var(--color-primary) 26%, transparent);
}

.footer-panel--contact .footer-panel__kicker {
  color: color-mix(in srgb, var(--color-primary) 78%, var(--color-ink));
}

.contact-list {
  list-style: none;
  display: grid;
  gap: 10px;
}

.contact-list li { display: grid; gap: 2px; }

.contact-list__key {
  font-size: var(--text-xs);
  font-weight: 650;
  letter-spacing: 0.14em;
  color: color-mix(in srgb, var(--color-ink) 62%, var(--color-primary));
}

.contact-list__val {
  font-size: var(--text-sm);
  line-height: 1.65;
  color: var(--color-ink);
  overflow-wrap: anywhere;
}

.footer-strip {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-3);
  margin-top: var(--space-3);
  padding: 14px var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--color-surface) 74%, transparent);
  font-size: var(--text-xs);
  line-height: 1.8;
  color: var(--color-ink-muted);
}

.footer-strip__note { max-width: 34ch; }

.footer-strip__links {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.footer-strip__links a {
  color: var(--color-ink-soft);
  border-bottom: var(--border-thin) solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.footer-strip__links a:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.footer-strip__copy {
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

@media (min-width: 760px) {
  .footer-strip__copy { margin-left: auto; }
}

/* ==========================================================================
   动效
   ========================================================================== */

.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.has-js [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

@keyframes pulse-figure {
  0% { transform: scale(1); }
  38% { transform: scale(1.06); }
  100% { transform: scale(1); }
}

.is-pulsing {
  display: inline-block;
  animation: pulse-figure 0.72s ease-out 1;
  transform-origin: center;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  .has-js [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .is-pulsing { animation: none; }

  [data-filter-item] { transition: none; }

  .site-nav,
  .rail-progress__bar,
  .skip-link,
  .btn,
  .line-chip,
  .nav-link,
  .nav-toggle,
  .nav-toggle__bars i,
  .disclosure__icon::after {
    transition: none;
  }
}

/* ==========================================================================
   打印
   ========================================================================== */

@media print {
  .site-header,
  .site-footer,
  .filter-bar,
  .skip-link { display: none; }

  body { padding-left: 0; background: #fff; }
}