:root {
  --color-surface: #fbfbfb;
  --color-surface-alt: #f2f2f2;
  --color-surface-deep: #e6e6e4;
  --color-ink: #4b4a3f;
  --color-ink-soft: #717061;
  --color-ink-muted: #888777;
  --color-line: #dbdbd9;
  --color-primary: #7b793c;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #e9e9e0;
  --color-accent: #4e8023;
  --color-accent-ink: #ffffff;
  --color-highlight: #dce5d4;
  --color-focus: #488019;
  --color-contrast-surface: #24241a;
  --color-contrast-ink: #e7e7e4;
  --color-contrast-line: #4f4f46;
  --color-contrast-accent: #79c837;
  --overlay-scrim: linear-gradient(180deg, rgba(36, 36, 26, 0.35) 0%, rgba(36, 36, 26, 0.72) 55%, rgba(36, 36, 26, 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: 11.4px;
  --text-sm: 14.3px;
  --text-base: 16px;
  --text-lg: 20.0px;
  --text-xl: 25.0px;
  --text-2xl: 31.2px;
  --text-3xl: 39.1px;
  --text-4xl: 48.8px;
  --text-display: clamp(34px, 6.2vw, 80px);
  --text-figure: clamp(28px, 4.5vw, 58px);
  --weight-heading: 613;
  --weight-body: 400;
  --leading-body: 1.85;
  --leading-heading: 1.21;
  --tracking-heading: -0.008em;
  --radius-sm: 18px;
  --radius-md: 23px;
  --radius-lg: 28px;
  --radius-pill: 999px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: 0 6px 18px rgba(75, 74, 63, 0.08);
  --shadow-2: 0 18px 44px rgba(75, 74, 63, 0.14);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1220px;
  --measure: 70ch;
  --gutter: 16px;
  --section-y: 94px;
  --section-y-lg: 132px;
}

/* ============ reset ============ */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
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);
  overflow-x: hidden;
}
h1, h2, h3, h4, h5, h6, p, ul, ol, dl, figure, blockquote, table { margin: 0; }
ul, ol { padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
img, picture, svg, video { display: block; max-width: 100%; height: auto; }
table { border-collapse: collapse; width: 100%; }
strong { font-weight: var(--weight-heading); }
:focus-visible { outline: 2px solid var(--color-focus); outline-offset: 3px; border-radius: 6px; }

/* ============ 排版基座 ============ */
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}
.display-title { font-size: var(--text-display); line-height: 1.06; }
.section-title { font-size: var(--text-3xl); }
.section-title--lg { font-size: var(--text-4xl); }
.lede { font-size: var(--text-lg); color: var(--color-ink-soft); max-width: var(--measure); }

/* ============ 布局工具 ============ */
.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); }
.bg-surface { background-color: var(--color-surface); }
.bg-alt { background-color: var(--color-surface-alt); }
.bg-deep { background-color: var(--color-surface-deep); }
.bg-contrast { background-color: var(--color-contrast-surface); color: var(--color-contrast-ink); }
.bg-contrast h1, .bg-contrast h2, .bg-contrast h3, .bg-contrast h4 { color: var(--color-contrast-ink); }
.rule { height: 1px; border: 0; background-color: var(--color-line); }
.bg-contrast .rule { background-color: var(--color-contrast-line); }

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

.section-head {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  max-width: var(--measure);
  margin-bottom: var(--space-4);
}
.section-head--split {
  flex-direction: row;
  align-items: flex-end;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-3);
  max-width: none;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  align-self: flex-start;
  padding: 5px 14px;
  border-radius: var(--radius-pill);
  background-color: var(--color-primary-soft);
  color: var(--color-primary);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
}
.section-lede { font-size: var(--text-lg); color: var(--color-ink-soft); max-width: var(--measure); }
.bg-contrast .section-lede { color: var(--color-contrast-ink); }
.bg-contrast .section-lede { color: color-mix(in srgb, var(--color-contrast-ink) 76%, transparent); }

/* 羽翼微动效图形 */
.wing {
  position: relative;
  display: inline-block;
  width: 24px;
  height: 16px;
  flex: 0 0 24px;
  margin-right: 10px;
  vertical-align: middle;
}
.wing::before,
.wing::after {
  content: "";
  position: absolute;
  left: 0;
  height: 4px;
  border-radius: 2px;
  background-color: var(--color-primary);
  transform-origin: left center;
  transition: transform 320ms ease-out;
}
.wing::before { top: 0; width: 22px; transform: scaleX(0.32) rotate(-20deg); }
.wing::after { top: 7px; width: 16px; background-color: var(--color-accent); transform: scaleX(0.46) rotate(-8deg); }
.is-visible .wing::before { transform: scaleX(1) rotate(-20deg); }
.is-visible .wing::after { transform: scaleX(1) rotate(-8deg); }
.bg-contrast .wing::before { background-color: var(--color-contrast-accent); }
.bg-contrast .wing::after { background-color: var(--color-contrast-ink); }

/* ============ 跳过导航 ============ */
.skip-link {
  position: fixed;
  left: var(--space-3);
  top: -80px;
  z-index: 200;
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  transition: top 200ms ease-out;
}
.skip-link:focus { top: var(--space-2); }

/* ============ 页头：悬浮胶囊导航 ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  padding-block: var(--space-2);
  background-color: color-mix(in srgb, var(--color-surface) 84%, transparent);
  backdrop-filter: blur(10px);
  transition: padding-block 200ms ease-out;
}
.site-header[data-scrolled="true"] { padding-block: var(--space-1); }

.header-island {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 12px var(--space-3);
  background-color: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-1);
  transition: box-shadow 240ms ease-out, border-radius 240ms ease-out;
}
.site-header[data-scrolled="true"] .header-island {
  box-shadow: var(--shadow-2);
  border-radius: var(--radius-md);
}

.header-top {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.brand { display: flex; align-items: center; gap: var(--space-2); flex: 0 0 auto; }
.brand-mark {
  position: relative;
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  flex: 0 0 40px;
  border-radius: var(--radius-sm);
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
}
.brand-mark::after {
  content: "";
  position: absolute;
  top: 6px;
  right: 6px;
  width: 7px;
  height: 7px;
  border-radius: var(--radius-pill);
  background-color: var(--color-accent);
}
.brand-mark--sm { width: 34px; height: 34px; flex-basis: 34px; font-size: var(--text-sm); }
.brand-text { display: flex; flex-direction: column; gap: 2px; line-height: 1.15; }
.brand-name { font-family: var(--font-heading); font-size: var(--text-lg); font-weight: var(--weight-heading); color: var(--color-ink); }
.brand-note { font-size: var(--text-xs); color: var(--color-ink-muted); }

.site-nav { display: flex; align-items: center; margin-left: auto; }
.nav-list { display: flex; align-items: center; gap: var(--space-1); }
.nav-list a {
  display: inline-block;
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  white-space: nowrap;
  transition: background-color 200ms ease-out, color 200ms ease-out;
}
.nav-list a:hover { background-color: var(--color-primary-soft); color: var(--color-ink); }
.nav-list a[aria-current="page"] { background-color: var(--color-primary); color: var(--color-primary-ink); }

.season-tick {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  padding: 5px 14px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background-color: var(--color-surface-alt);
}
.season-tick-label { font-size: var(--text-xs); color: var(--color-ink-muted); }
.season-tick-value { font-size: var(--text-xs); font-weight: var(--weight-heading); color: var(--color-ink); white-space: nowrap; }
.season-tick-scale { display: flex; align-items: flex-end; gap: 3px; height: 14px; }
.season-tick-scale i { display: block; width: 3px; border-radius: var(--radius-pill); background-color: var(--color-line); }
.season-tick-scale i:nth-child(1) { height: 5px; }
.season-tick-scale i:nth-child(2) { height: 8px; }
.season-tick-scale i:nth-child(3) { height: 11px; }
.season-tick-scale i:nth-child(4) { height: 14px; background-color: var(--color-accent); }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
  padding: 8px 16px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background-color: var(--color-surface-alt);
  font-size: var(--text-sm);
  color: var(--color-ink);
}
.nav-toggle-glyph { display: flex; flex-direction: column; gap: 4px; }
.nav-toggle-glyph i {
  display: block;
  width: 16px;
  height: 2px;
  border-radius: 2px;
  background-color: currentColor;
  transition: transform 200ms ease-out;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-glyph i:first-child { transform: translateY(3px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-glyph i:last-child { transform: translateY(-3px) rotate(-45deg); }

.header-quick {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-2);
  padding-top: var(--space-2);
  border-top: var(--border-thin) solid var(--color-line);
  max-height: 80px;
  opacity: 1;
  overflow: hidden;
  transition: max-height 260ms ease-out, opacity 200ms ease-out, margin-top 260ms ease-out, padding-top 260ms ease-out;
}
.site-header[data-scrolled="true"] .header-quick {
  max-height: 0;
  opacity: 0;
  margin-top: 0;
  padding-top: 0;
  border-top-color: transparent;
}
.header-quick-label { font-size: var(--text-xs); color: var(--color-ink-muted); letter-spacing: 0.08em; }
.quick-list { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-1); }

/* ============ 通用组件 ============ */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-pill);
  background-color: var(--color-primary-soft);
  color: var(--color-ink-soft);
  font-size: var(--text-xs);
  white-space: nowrap;
  transition: color 200ms ease-out, border-color 200ms ease-out;
}
.chip::before {
  content: "";
  width: 5px;
  height: 5px;
  flex: 0 0 5px;
  border-radius: var(--radius-pill);
  background-color: var(--color-accent);
}
.chip:hover { color: var(--color-ink); border-color: var(--color-primary); }

.tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  background-color: var(--color-surface-deep);
  color: var(--color-ink-muted);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
}
.bg-contrast .tag, .card--contrast .tag {
  background-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
}

.card {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-3);
  background-color: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-1);
}
.card--deep { background-color: var(--color-surface-deep); }
.card--contrast {
  background-color: var(--color-contrast-surface);
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
  box-shadow: var(--shadow-2);
}
.card--contrast h1, .card--contrast h2, .card--contrast h3, .card--contrast h4 { color: var(--color-contrast-ink); }
.card--contrast .card-meta, .card--contrast .metric-label {
  color: var(--color-contrast-ink);
  color: color-mix(in srgb, var(--color-contrast-ink) 64%, transparent);
}
.card--contrast .btn--ghost { border-color: var(--color-contrast-line); color: var(--color-contrast-ink); }
.card-link { transition: transform 200ms ease-out, box-shadow 200ms ease-out; }
.card-link:hover { transform: translateY(-3px); box-shadow: var(--shadow-2); }
.card-title { font-size: var(--text-xl); }
.card-meta { font-size: var(--text-xs); color: var(--color-ink-muted); }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-pill);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  transition: background-color 200ms ease-out, color 200ms ease-out, border-color 200ms ease-out;
}
.btn--primary { background-color: var(--color-primary); color: var(--color-primary-ink); }
.btn--primary:hover { background-color: color-mix(in srgb, var(--color-primary) 82%, 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) 82%, var(--color-contrast-surface)); }
.btn--ghost { border-color: var(--color-line); color: var(--color-ink); background-color: transparent; }
.btn--ghost:hover { border-color: var(--color-primary); color: var(--color-primary); }

.index-list { display: flex; flex-direction: column; border-top: var(--border-thin) solid var(--color-line); }
.index-list > li { border-bottom: var(--border-thin) solid var(--color-line); }
.index-item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-1);
  transition: background-color 200ms ease-out, padding-left 200ms ease-out;
}
.index-item:hover { background-color: var(--color-surface-alt); padding-left: var(--space-3); }
.index-item-title { font-family: var(--font-heading); font-size: var(--text-lg); font-weight: var(--weight-heading); color: var(--color-ink); }
.index-item-meta { margin-left: auto; font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-ink-muted); }

.metric-row { display: flex; flex-wrap: wrap; gap: var(--space-4); }
.metric { display: flex; flex-direction: column; gap: 4px; min-width: 110px; }
.metric-value {
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-ink);
}
.metric--accent .metric-value { color: var(--color-accent); }
.metric-label { font-size: var(--text-xs); color: var(--color-ink-muted); }
.bg-contrast .metric-value, .card--contrast .metric-value { color: var(--color-contrast-accent); }
.bg-contrast .metric-label, .card--contrast .metric-label {
  color: var(--color-contrast-ink);
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}

.breath {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: var(--radius-pill);
  background-color: var(--color-accent);
  animation: phoenix-breath 2.4s ease-in-out infinite;
}
@keyframes phoenix-breath {
  0%, 100% { background-color: var(--color-accent); opacity: 1; }
  50% { background-color: var(--color-primary); opacity: 0.42; }
}
.bg-contrast .breath, .card--contrast .breath { animation-name: phoenix-breath-dark; }
@keyframes phoenix-breath-dark {
  0%, 100% { background-color: var(--color-contrast-accent); opacity: 1; }
  50% { background-color: var(--color-primary); opacity: 0.4; }
}

.figure-frame {
  position: relative;
  overflow: hidden;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  background-color: var(--color-surface-deep);
}
.figure-frame img { width: 100%; height: 100%; object-fit: cover; aspect-ratio: 16 / 9; }
.figure-frame[data-ratio="4-3"] img { aspect-ratio: 4 / 3; }
.figure-frame[data-ratio="1-1"] img { aspect-ratio: 1 / 1; }
.figure-frame[data-ratio="3-4"] img { aspect-ratio: 3 / 4; }
.figure-caption {
  position: absolute;
  left: 14px;
  bottom: 14px;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  background-color: var(--color-highlight);
  color: var(--color-ink-muted);
  font-size: var(--text-xs);
}
.figure-overlay {
  position: absolute;
  inset: auto 0 0 0;
  padding: var(--space-3);
  background-image: var(--overlay-scrim);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
}

.prose { max-width: var(--measure); }
.prose > * + * { margin-top: var(--space-3); }
.prose h2 { font-size: var(--text-2xl); }
.prose h3 { font-size: var(--text-xl); }
.prose p { color: var(--color-ink-soft); }
.prose a { color: var(--color-primary); border-bottom: var(--border-thin) solid var(--color-primary); }
.prose ul { display: flex; flex-direction: column; gap: 8px; padding-left: var(--space-3); list-style: disc; }
.prose li { color: var(--color-ink-soft); }
.bg-contrast .prose p, .bg-contrast .prose li { color: color-mix(in srgb, var(--color-contrast-ink) 82%, transparent); }

.pull-quote {
  position: relative;
  padding: var(--space-3) var(--space-3) var(--space-3) var(--space-4);
  border-left: 3px solid var(--color-primary);
  border-radius: var(--radius-md);
  background-color: var(--color-primary-soft);
  font-size: var(--text-lg);
  color: var(--color-ink);
}
.pull-quote::before {
  content: "\201C";
  position: absolute;
  left: 10px;
  top: 6px;
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  line-height: 1;
  color: var(--color-primary);
  opacity: 0.45;
}
.indent-note {
  padding-left: var(--space-2);
  border-left: var(--border-thin) solid var(--color-line);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}
.bg-contrast .indent-note {
  border-left-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
  color: color-mix(in srgb, var(--color-contrast-ink) 74%, transparent);
}

.breadcrumb { font-size: var(--text-xs); color: var(--color-ink-muted); }
.breadcrumb ol { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.breadcrumb li { display: flex; align-items: center; gap: 8px; }
.breadcrumb li + li::before { content: "/"; color: var(--color-line); }
.breadcrumb a { color: var(--color-ink-soft); transition: color 200ms ease-out; }
.breadcrumb a:hover { color: var(--color-primary); }
.breadcrumb [aria-current="page"] { color: var(--color-ink); }

/* ============ 页脚：卡片式面板 ============ */
.site-footer {
  padding-block: var(--space-6);
  background-color: var(--color-surface-alt);
  border-top: var(--border-thin) solid var(--color-line);
}
.footer-grid { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: var(--gutter); }
.footer-panel {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-3);
  background-color: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-1);
}
.footer-panel:nth-child(1) { grid-column: span 4; }
.footer-panel:nth-child(2) { grid-column: span 3; }
.footer-panel:nth-child(3) { grid-column: span 3; }
.footer-panel:nth-child(4) { grid-column: span 2; }
.footer-panel--dark {
  background-color: var(--color-contrast-surface);
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
  box-shadow: none;
}
.footer-panel-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  letter-spacing: 0.08em;
  color: var(--color-ink);
}
.footer-panel--dark .footer-panel-title { color: var(--color-contrast-ink); }
.footer-panel-title::before {
  content: "";
  width: 14px;
  height: 2px;
  flex: 0 0 14px;
  border-radius: 2px;
  background-color: var(--color-primary);
}
.footer-panel--dark .footer-panel-title::before { background-color: var(--color-contrast-accent); }
.footer-list { display: flex; flex-direction: column; gap: 10px; font-size: var(--text-sm); color: var(--color-ink-soft); }
.footer-panel--dark .footer-list { color: var(--color-contrast-ink); }
.footer-list--links a {
  display: inline-block;
  border-bottom: var(--border-thin) solid transparent;
  transition: color 200ms ease-out, border-color 200ms ease-out;
}
.footer-list--links a:hover { color: var(--color-ink); border-bottom-color: var(--color-primary); }
.footer-strong {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-contrast-accent);
  overflow-wrap: anywhere;
}
.footer-note { font-size: var(--text-xs); line-height: 1.7; color: var(--color-contrast-ink); color: color-mix(in srgb, var(--color-contrast-ink) 68%, transparent); }
.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: var(--border-thin) solid var(--color-line);
}
.footer-brand { display: flex; align-items: center; gap: var(--space-2); }
.footer-legal { font-size: var(--text-xs); color: var(--color-ink-muted); }

/* ============ 动效 ============ */
[data-reveal] { transition: opacity 320ms ease-out, transform 320ms ease-out; }
html.js [data-reveal] { opacity: 0; transform: translateY(18px); }
html.js [data-reveal].is-visible { opacity: 1; transform: none; }

/* ============ 响应式 ============ */
@media (max-width: 1180px) {
  .season-tick-label { display: none; }
}
@media (max-width: 1024px) {
  .grid--3, .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .layout-split, .layout-split--reverse { grid-template-columns: minmax(0, 1fr); }
  .footer-panel:nth-child(1),
  .footer-panel:nth-child(2),
  .footer-panel:nth-child(3),
  .footer-panel:nth-child(4) { grid-column: span 6; }
}
@media (max-width: 900px) {
  .nav-toggle { display: inline-flex; }
  .season-tick { margin-left: auto; }
  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: calc(100% + 10px);
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-2);
    margin: 0;
    padding: var(--space-2);
    background-color: var(--color-surface);
    border: var(--border-thin) solid var(--color-line);
    border-radius: 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-list a { padding: 12px 16px; border-radius: var(--radius-sm); font-size: var(--text-base); }
  .section { padding-block: var(--space-8); }
  .section--lg { padding-block: var(--space-8); }
  .section-head--split { flex-direction: column; align-items: flex-start; }
}
@media (max-width: 620px) {
  .container { padding-inline: var(--space-2); }
  .header-island { padding-inline: var(--space-2); }
  .grid--2, .grid--3, .grid--4 { grid-template-columns: minmax(0, 1fr); }
  .footer-panel:nth-child(1),
  .footer-panel:nth-child(2),
  .footer-panel:nth-child(3),
  .footer-panel:nth-child(4) { grid-column: span 12; }
  .footer-grid { gap: var(--space-3); }
  .footer-base { flex-direction: column; align-items: flex-start; }
  .brand-note { display: none; }
  .header-quick-label { display: none; }
  .quick-list { flex-wrap: nowrap; overflow-x: auto; padding-bottom: 4px; }
  .metric-row { gap: var(--space-3); }
  .pull-quote { font-size: var(--text-base); }
}

/* ============ 无障碍偏好 ============ */
@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;
  }
  html.js [data-reveal] { opacity: 1; transform: none; }
  .breath { animation: none; background-color: var(--color-accent); }
  .bg-contrast .breath, .card--contrast .breath { animation: none; background-color: var(--color-contrast-accent); }
  .wing::before { transform: scaleX(1) rotate(-20deg); }
  .wing::after { transform: scaleX(1) rotate(-8deg); }
}