:root {
  --color-surface: #fdfefd;
  --color-surface-alt: #f4f5f4;
  --color-surface-deep: #e6e9e7;
  --color-ink: #404f49;
  --color-ink-soft: #60766e;
  --color-ink-muted: #748b82;
  --color-line: #dbdedd;
  --color-primary: #4b816c;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #e4ece9;
  --color-accent: #21827c;
  --color-accent-ink: #ffffff;
  --color-highlight: #d5e8e6;
  --color-focus: #17827b;
  --color-contrast-surface: #19201d;
  --color-contrast-ink: #e4e7e6;
  --color-contrast-line: #464c49;
  --color-contrast-accent: #33ccc2;
  --overlay-scrim: linear-gradient(180deg, rgba(25, 32, 29, 0.35) 0%, rgba(25, 32, 29, 0.72) 55%, rgba(25, 32, 29, 0.92) 100%);
  --font-heading: "Hiragino Sans GB", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Hiragino Sans GB", "PingFang SC", "Microsoft YaHei", 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(37px, 7.7vw, 98px);
  --text-figure: clamp(31px, 5.5vw, 71px);
  --weight-heading: 617;
  --weight-body: 400;
  --leading-body: 1.8;
  --leading-heading: 1.23;
  --tracking-heading: 0.004em;
  --radius-sm: 18px;
  --radius-md: 18px;
  --radius-lg: 18px;
  --radius-pill: 999px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: 0 6px 18px rgba(64, 79, 73, 0.08);
  --shadow-2: 0 18px 44px rgba(64, 79, 73, 0.14);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1180px;
  --measure: 66ch;
  --gutter: 32px;
  --section-y: 90px;
  --section-y-lg: 126px;
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

body {
  margin: 0;
  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);
  -webkit-font-smoothing: antialiased;
}

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

h1, h2, h3, h4 {
  margin: 0;
  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;
}

p { margin: 0 0 var(--space-3); }
p:last-child { margin-bottom: 0; }

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

a { color: var(--color-primary); text-decoration-thickness: 1px; text-underline-offset: 3px; }

button { font: inherit; color: inherit; }

[hidden] { display: none !important; }

:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 2px;
  border-radius: calc(var(--radius-sm) * 0.4);
}

/* ---------- 排版 ---------- */
.display {
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 0.98;
  letter-spacing: -0.018em;
  text-wrap: balance;
}

.title-xl { font-size: var(--text-3xl); line-height: 1.14; }
.title-lg { font-size: var(--text-2xl); line-height: 1.2; }

.lede {
  font-size: var(--text-lg);
  line-height: 1.62;
  color: var(--color-ink-soft);
  max-width: var(--measure);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
  margin-bottom: var(--space-2);
}

.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
}

/* ---------- 容器与节奏 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-3);
}

.section { padding-block: var(--section-y); }
.section--lg { padding-block: var(--section-y-lg); }

.stack > * + * { margin-top: var(--space-4); }

.band {
  background-color: var(--color-surface-alt);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
}
.band--deep { background-color: var(--color-surface-deep); }
.band--primary { background-color: var(--color-primary-soft); }

@media (min-width: 720px) {
  .container { padding-inline: var(--space-4); }
  .band { padding: var(--space-6); }
  .band--roomy { padding: var(--space-8); }
}

/* ---------- 栅格 ---------- */
.grid { display: grid; gap: var(--gutter); }

.grid--main { display: grid; gap: var(--gutter); }

@media (min-width: 720px) {
  .grid--2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--gutter); }
}

@media (min-width: 960px) {
  .grid--3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--gutter); }
  .grid--4 { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: var(--gutter); }
  .grid--main { grid-template-columns: minmax(0, 7.5fr) minmax(0, 3.5fr); align-items: start; }
  .grid--main--wide { grid-template-columns: minmax(0, 8fr) minmax(0, 4fr); }
}

/* ---------- 跳转链接 ---------- */
.skip-link {
  position: absolute;
  left: var(--space-2);
  top: -80px;
  z-index: 99;
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  text-decoration: none;
  transition: top 160ms ease;
}
.skip-link:focus { top: var(--space-2); }

/* ---------- 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background-color: color-mix(in srgb, var(--color-surface) 90%, transparent);
  backdrop-filter: blur(12px) saturate(1.15);
  border-bottom: var(--border-thin) solid var(--color-line);
  transition: box-shadow 180ms ease;
}

.site-header[data-scrolled="true"] { box-shadow: var(--shadow-1); }

.header-inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 76px;
  padding-block: var(--space-2);
  transition: min-height 180ms ease, padding 180ms ease;
}

.site-header[data-scrolled="true"] .header-inner {
  min-height: 58px;
  padding-block: 6px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: var(--color-ink);
  flex: none;
}

.brand-mark {
  position: relative;
  width: 36px;
  height: 36px;
  flex: none;
  border-radius: calc(var(--radius-sm) * 0.72);
  background-color: var(--color-primary);
  box-shadow: var(--shadow-1);
}
.brand-mark::after {
  content: "";
  position: absolute;
  inset: 12px;
  border-radius: var(--radius-pill);
  background-color: var(--color-contrast-accent);
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 1px;
  line-height: 1.18;
}

.brand-name {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
}

.brand-line {
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  white-space: nowrap;
}

.site-header[data-scrolled="true"] .brand-line { display: none; }

/* 导航 */
.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-left: auto;
  min-width: 0;
}

.nav-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 2px;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 7px 11px;
  border-radius: calc(var(--radius-sm) * 0.62);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  text-decoration: none;
  white-space: nowrap;
  transition: background-color 160ms ease, color 160ms ease;
}

.nav-link:hover { background-color: var(--color-surface-alt); color: var(--color-ink); }

.nav-index {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.02em;
  padding: 2px 6px;
  border-radius: calc(var(--radius-sm) * 0.45);
  background-color: var(--color-surface-deep);
  color: var(--color-ink-muted);
  transition: background-color 160ms ease, color 160ms ease;
}

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

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

.nav-link[aria-current="page"]::after {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: var(--radius-pill);
  background-color: var(--color-accent);
}

.nav-utility {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-left: var(--space-2);
  padding-left: var(--space-3);
  border-left: var(--border-thin) solid var(--color-line);
}

.nav-stage {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: var(--text-xs);
  color: var(--color-ink-soft);
  white-space: nowrap;
}

.nav-stage-dot {
  width: 8px;
  height: 8px;
  border-radius: var(--radius-pill);
  background-color: var(--color-contrast-accent);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--color-highlight) 80%, transparent);
}

.nav-search {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  background-color: var(--color-surface-deep);
  color: var(--color-ink);
  font-size: var(--text-xs);
  text-decoration: none;
  transition: background-color 160ms ease, color 160ms ease;
}
.nav-search:hover { background-color: var(--color-primary-soft); color: var(--color-primary); }

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: var(--space-1);
  margin-left: auto;
  padding: 9px 16px;
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-pill);
  background-color: var(--color-primary-soft);
  color: var(--color-ink);
  font-size: var(--text-sm);
  cursor: pointer;
  transition: background-color 160ms ease;
}
.nav-toggle:hover { background-color: var(--color-highlight); }

.nav-toggle-lines {
  position: relative;
  display: block;
  width: 16px;
  height: 10px;
  flex: none;
}
.nav-toggle-lines::before,
.nav-toggle-lines::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  border-radius: var(--radius-pill);
  background-color: var(--color-primary);
  transition: transform 180ms ease, top 180ms ease;
}
.nav-toggle-lines::before { top: 0; }
.nav-toggle-lines::after { top: 8px; }

.nav-toggle[aria-expanded="true"] .nav-toggle-lines::before { top: 4px; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-lines::after { top: 4px; transform: rotate(-45deg); }

@media (max-width: 919px) {
  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-2);
    margin-left: 0;
    padding: var(--space-3) var(--space-3) var(--space-4);
    max-height: 78vh;
    overflow-y: auto;
    background-color: var(--color-surface);
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
    box-shadow: var(--shadow-2);
  }

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

  .nav-list { flex-direction: column; align-items: stretch; gap: 2px; }

  .nav-link {
    justify-content: flex-start;
    padding: 11px 12px;
    font-size: var(--text-base);
    border-radius: var(--radius-sm);
  }

  .nav-utility {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
    margin-left: 0;
    padding-left: 0;
    padding-top: var(--space-3);
    border-left: 0;
    border-top: var(--border-thin) solid var(--color-line);
  }
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 12px 24px;
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-pill);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  text-decoration: none;
  cursor: pointer;
  transition: transform 140ms ease, background-color 140ms ease, box-shadow 140ms ease, color 140ms ease;
}
.btn:hover { transform: translateY(-2px); }

.btn--primary {
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  box-shadow: var(--shadow-1);
}
.btn--primary:hover { background-color: color-mix(in srgb, var(--color-primary) 84%, var(--color-ink)); }

.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-ink)); }

.btn--ghost {
  background-color: var(--color-surface);
  color: var(--color-ink);
  border-color: var(--color-line);
}
.btn--ghost:hover { background-color: var(--color-primary-soft); border-color: var(--color-primary); }

/* ---------- 面包屑 ---------- */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  margin-bottom: var(--space-4);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}
.crumbs a { color: var(--color-ink-soft); text-decoration: none; }
.crumbs a:hover { color: var(--color-primary); text-decoration: underline; }
.crumbs li:not(:last-child)::after {
  content: "/";
  margin-left: var(--space-1);
  color: var(--color-ink-muted);
  opacity: 0.6;
}

/* ---------- 卡片 ---------- */
.card {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  box-shadow: var(--shadow-1);
}

.card__title { font-size: var(--text-xl); margin-bottom: var(--space-2); }

.card__meta {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

/* ---------- 深色数据带 ---------- */
.data-band {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
}
.data-band .data-band__value {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  line-height: 1;
  color: var(--color-contrast-accent);
}
.data-band .data-band__label {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-sm);
  color: var(--color-contrast-ink);
  opacity: 0.86;
}
@media (min-width: 720px) {
  .data-band { padding: var(--space-6); }
}

/* ---------- 强调与分隔 ---------- */
.rule-line {
  position: relative;
  padding-left: var(--space-3);
}
.rule-line::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 4px;
  border-radius: var(--radius-pill);
  background-color: var(--color-primary);
}
.rule-line--accent::before { background-color: var(--color-accent); }

.barrier {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-block: var(--space-4);
}
.barrier__num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
}
.barrier__ticks {
  flex: 1;
  height: 8px;
  background-image: repeating-linear-gradient(90deg, var(--color-line) 0 1px, transparent 1px 14px);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  background-color: var(--color-primary-soft);
  color: var(--color-ink-soft);
  font-size: var(--text-xs);
}
.tag--accent { background-color: var(--color-highlight); color: var(--color-ink); }

.note {
  background-color: var(--color-primary-soft);
  border-radius: var(--radius-lg);
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

/* ---------- 图片容器 ---------- */
.media {
  position: relative;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  min-height: 240px;
  border-radius: var(--radius-lg);
  background-color: var(--color-surface-deep);
  isolation: isolate;
}
.media__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media__scrim {
  position: absolute;
  inset: 0;
  background-image: var(--overlay-scrim);
}
.media__body {
  position: relative;
  z-index: 1;
  width: 100%;
  padding: var(--space-4);
  color: var(--color-contrast-ink);
}
.media__body .data-band__value { color: var(--color-contrast-accent); }

/* ---------- 筛选 ---------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
}

.filter-chip {
  padding: 8px 18px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background-color: var(--color-surface);
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  cursor: pointer;
  transition: background-color 160ms ease, color 160ms ease, border-color 160ms ease;
}
.filter-chip:hover { background-color: var(--color-surface-alt); color: var(--color-ink); }
.filter-chip[aria-pressed="true"] {
  background-color: var(--color-highlight);
  border-color: var(--color-focus);
  color: var(--color-ink);
}

.filter-status {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  margin-left: auto;
}

.is-flash { animation: filterFlash 180ms ease-out; }
@keyframes filterFlash {
  from { opacity: 0.4; }
  to { opacity: 1; }
}

/* ---------- 显现 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 420ms ease, transform 420ms cubic-bezier(0.22, 0.7, 0.3, 1);
}
.reveal.is-visible { opacity: 1; transform: none; }

/* ---------- 页脚 ---------- */
.site-footer {
  margin-top: var(--section-y-lg);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  overflow: hidden;
}

.footer-scales {
  height: 16px;
  background-image: repeating-linear-gradient(90deg, var(--color-contrast-accent) 0 2px, transparent 2px 26px);
  opacity: 0.6;
}

.footer-inner {
  display: grid;
  gap: var(--space-6);
  padding-block: var(--space-6) var(--space-6);
}

.footer-brand { display: flex; flex-direction: column; gap: var(--space-1); }

.footer-brand__name {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
}

.footer-brand__line {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-contrast-accent);
}

.footer-note {
  margin-top: var(--space-2);
  max-width: 34ch;
  font-size: var(--text-sm);
  line-height: 1.68;
  color: var(--color-contrast-ink);
  opacity: 0.74;
}

.footer-grid { display: grid; gap: var(--space-4); }

.footer-col__title {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-base);
  color: var(--color-contrast-ink);
  padding-bottom: var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
  margin-bottom: var(--space-2);
}

.footer-col__num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-contrast-accent);
}

.footer-list { display: flex; flex-direction: column; gap: var(--space-1); }
.footer-list li { font-size: var(--text-sm); color: var(--color-contrast-ink); opacity: 0.82; }

.footer-list--links a {
  color: var(--color-contrast-ink);
  text-decoration: none;
  border-bottom: var(--border-thin) solid transparent;
  transition: color 140ms ease, border-color 140ms ease;
}
.footer-list--links a:hover,
.footer-list--links a:focus-visible {
  color: var(--color-contrast-accent);
  border-bottom-color: var(--color-contrast-accent);
}

.footer-list--contact li { font-family: var(--font-mono); font-size: var(--text-xs); }
.footer-list__note { font-family: var(--font-body); opacity: 0.6 !important; }

.footer-base { border-top: var(--border-thin) solid var(--color-contrast-line); }

.footer-base__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2) var(--space-4);
  padding-block: var(--space-3);
  font-size: var(--text-xs);
}

.footer-copy { margin: 0; color: var(--color-contrast-ink); opacity: 0.78; }
.footer-icp { font-family: var(--font-mono); }

.footer-legal { display: flex; flex-wrap: wrap; gap: var(--space-3); }
.footer-legal a {
  color: var(--color-contrast-ink);
  text-decoration: none;
  opacity: 0.78;
  border-bottom: var(--border-thin) solid transparent;
  transition: color 140ms ease, border-color 140ms ease, opacity 140ms ease;
}
.footer-legal a:hover,
.footer-legal a:focus-visible {
  color: var(--color-contrast-accent);
  opacity: 1;
  border-bottom-color: var(--color-contrast-accent);
}

@media (min-width: 720px) {
  .footer-inner { padding-block: var(--space-8) var(--space-6); }
}

@media (min-width: 960px) {
  .footer-inner { grid-template-columns: minmax(0, 0.9fr) minmax(0, 2fr); align-items: start; }
  .footer-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

/* ---------- 减弱动效 ---------- */
@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;
  }
  .reveal { opacity: 1; transform: none; }
}