:root {
  --color-surface: #ededec;
  --color-surface-alt: #e5e4e3;
  --color-surface-deep: #d9d8d7;
  --color-ink: #464139;
  --color-ink-soft: #6d665a;
  --color-ink-muted: #8a8275;
  --color-line: #cfcecc;
  --color-primary: #89734d;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #dfdcd6;
  --color-accent: #6c7b1e;
  --color-accent-ink: #ffffff;
  --color-highlight: #d6d8c7;
  --color-focus: #627114;
  --color-contrast-surface: #25221c;
  --color-contrast-ink: #e7e6e4;
  --color-contrast-line: #504d48;
  --color-contrast-accent: #b3cc33;
  --overlay-scrim: linear-gradient(180deg, rgba(37, 34, 28, 0.35) 0%, rgba(37, 34, 28, 0.72) 55%, rgba(37, 34, 28, 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: 12.9px;
  --text-sm: 15.5px;
  --text-base: 17px;
  --text-lg: 20.4px;
  --text-xl: 24.5px;
  --text-2xl: 29.4px;
  --text-3xl: 35.3px;
  --text-4xl: 42.3px;
  --text-display: clamp(36px, 7.4vw, 95px);
  --text-figure: clamp(30px, 5.3vw, 68px);
  --weight-heading: 608;
  --weight-body: 400;
  --leading-body: 1.79;
  --leading-heading: 1.29;
  --tracking-heading: -0.002em;
  --radius-sm: 3px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-pill: 999px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: 0 1px 0 rgba(70, 65, 57, 0.12);
  --shadow-2: 0 2px 0 rgba(70, 65, 57, 0.18);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1180px;
  --measure: 70ch;
  --gutter: 24px;
  --section-y: 76px;
  --section-y-lg: 106px;
}

/* ============ reset 与中文排版基线 ============ */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
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);
  background-image: repeating-linear-gradient(121deg, color-mix(in srgb, var(--color-line) 55%, transparent) 0 1px, transparent 1px 108px);
  background-attachment: fixed;
}
img, svg, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, h5, h6, p, figure, blockquote { margin: 0; }
[hidden] { display: none !important; }
:focus-visible { outline: 3px solid var(--color-focus); outline-offset: 2px; border-radius: var(--radius-sm); }

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

.text-display {
  font-family: var(--font-heading);
  font-size: var(--text-display);
  line-height: 1.02;
  letter-spacing: var(--tracking-heading);
  font-weight: var(--weight-heading);
}
.figure-num {
  font-family: var(--font-heading);
  font-size: var(--text-figure);
  line-height: 0.95;
  font-weight: var(--weight-heading);
  color: var(--color-primary);
}
.unit {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
  margin-inline-start: 6px;
}
.lede { font-size: var(--text-lg); line-height: 1.68; color: var(--color-ink-soft); max-width: 62ch; }

/* ============ 布局骨架 ============ */
.wrap { width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: var(--gutter); }
.wrap--shift { padding-inline-start: calc(var(--gutter) + var(--space-3)); }
.section { padding-block: var(--section-y); }
.section--lg { padding-block: var(--section-y-lg); }
.section--alt { background-color: var(--color-surface-alt); }
.section--deep { background-color: var(--color-surface-deep); }
.section--contrast { background-color: var(--color-contrast-surface); color: var(--color-contrast-ink); }
.section--contrast h1,
.section--contrast h2,
.section--contrast h3,
.section--contrast h4 { color: var(--color-contrast-ink); }
.section--contrast p { color: var(--color-contrast-ink); }
.section--contrast .lede { color: color-mix(in srgb, var(--color-contrast-ink) 78%, var(--color-contrast-surface)); }
.section--contrast .figure-num { color: var(--color-contrast-accent); }
.section--contrast .sticker--outline { border-color: var(--color-contrast-line); color: var(--color-contrast-ink); }
.section--contrast .note-card { background-color: color-mix(in srgb, var(--color-contrast-ink) 8%, var(--color-contrast-surface)); border-color: var(--color-contrast-line); }
.section--contrast .note-card p { color: var(--color-contrast-ink); }
.section--contrast .note-card__label { color: var(--color-contrast-accent); }
.section--contrast .pull-quote { background-color: color-mix(in srgb, var(--color-contrast-ink) 10%, var(--color-contrast-surface)); color: var(--color-contrast-ink); }
.section--contrast .pull-quote::before { color: var(--color-contrast-accent); }

.rule-offset {
  height: 1px;
  border: 0;
  background-color: var(--color-line);
  width: min(68%, 620px);
  margin-inline-start: auto;
  margin-block: var(--space-6);
}
.rule-offset--start { margin-inline-start: 0; margin-inline-end: auto; }
.section--contrast .rule-offset { background-color: var(--color-contrast-line); }

.grid { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: var(--gutter); }
.col-3 { grid-column: span 3; }
.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-9 { grid-column: span 9; }
.col-12 { grid-column: span 12; }

/* ============ 纸片 ============ */
.paper {
  position: relative;
  background-color: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-2);
  padding: var(--space-4);
  transition: transform 160ms cubic-bezier(0.2, 0.7, 0.3, 1), box-shadow 160ms cubic-bezier(0.2, 0.7, 0.3, 1);
}
.paper:hover { transform: translateY(-2px); box-shadow: 0 4px 0 color-mix(in srgb, var(--color-ink) 20%, transparent); }
.paper--alt { background-color: var(--color-surface-alt); }
.paper--deep { background-color: var(--color-surface-deep); }
.paper--dark {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-color: var(--color-contrast-line);
}
.paper--dark h1, .paper--dark h2, .paper--dark h3, .paper--dark h4 { color: var(--color-contrast-ink); }
.paper--dark p { color: var(--color-contrast-ink); }
.paper--dark:hover { box-shadow: 0 4px 0 color-mix(in srgb, var(--color-contrast-ink) 24%, transparent); }
.paper--shift-r { margin-inline-start: var(--space-3); }
.paper--shift-l { margin-inline-end: var(--space-3); }

/* ============ 贴纸标签 ============ */
.sticker {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  line-height: 1.4;
  border-radius: var(--radius-sm);
  background-color: var(--color-primary-soft);
  color: var(--color-ink);
  box-shadow: var(--shadow-1);
}
.sticker--primary { background-color: var(--color-primary); color: var(--color-primary-ink); }
.sticker--accent { background-color: var(--color-accent); color: var(--color-accent-ink); }
.sticker--dark { background-color: var(--color-contrast-surface); color: var(--color-contrast-ink); }
.sticker--outline { background-color: transparent; border: var(--border-thin) solid var(--color-line); color: var(--color-ink-soft); }
.sticker--corner { position: absolute; top: -10px; left: -8px; transform: rotate(-2.5deg); z-index: 3; }
.sticker--corner-tr { position: absolute; top: -10px; right: -8px; left: auto; transform: rotate(2.4deg); z-index: 3; }

/* ============ 按钮 ============ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  line-height: 1.3;
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-2);
  cursor: pointer;
  transition: transform 160ms cubic-bezier(0.2, 0.7, 0.3, 1), box-shadow 160ms, background-color 160ms;
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 4px 0 color-mix(in srgb, var(--color-ink) 22%, transparent); }
.btn--primary { background-color: var(--color-primary); color: var(--color-primary-ink); }
.btn--accent { background-color: var(--color-accent); color: var(--color-accent-ink); }
.btn--ghost { background-color: transparent; color: var(--color-ink); border-color: var(--color-line); box-shadow: none; }
.btn--ghost:hover { background-color: var(--color-primary-soft); box-shadow: var(--shadow-2); }
.btn--sm { padding: 8px 14px; font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: 0.08em; }

/* ============ 面包屑 ============ */
.crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-block: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}
.crumb a { color: var(--color-ink-soft); border-bottom: 1px solid color-mix(in srgb, var(--color-primary) 45%, transparent); }
.crumb a:hover { color: var(--color-ink); }
.crumb__sep { color: var(--color-ink-muted); }
.crumb [aria-current="page"] { color: var(--color-primary); }

/* ============ 正文与强调 ============ */
.prose { max-width: var(--measure); }
.prose p + p { margin-top: var(--space-3); }
.prose p { color: var(--color-ink); }
.prose h2 { margin-top: var(--space-6); margin-bottom: var(--space-2); font-size: var(--text-2xl); }
.prose h3 { margin-top: var(--space-4); margin-bottom: var(--space-1); font-size: var(--text-xl); }
.prose ul { margin-top: var(--space-2); }
.prose ul li { position: relative; padding-inline-start: var(--space-3); margin-bottom: var(--space-1); }
.prose ul li::before { content: "—"; position: absolute; left: 0; color: var(--color-primary); }
.prose a { border-bottom: 1px solid var(--color-primary); }
.prose a:hover { background-color: var(--color-highlight); }

.pull-quote {
  position: relative;
  margin-block: var(--space-6);
  margin-inline-start: var(--space-6);
  max-width: 54ch;
  padding: var(--space-3) var(--space-4) var(--space-3) var(--space-6);
  background-color: var(--color-highlight);
  border-left: 3px solid var(--color-primary);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-1);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  line-height: 1.62;
  color: var(--color-ink);
}
.pull-quote::before {
  content: "\201C";
  position: absolute;
  left: var(--space-2);
  top: 4px;
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  line-height: 1;
  color: var(--color-primary);
}
.pull-quote::after { content: "\201D"; color: var(--color-primary); }

.note-card {
  background-color: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-line);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius-sm);
  padding: var(--space-3);
  box-shadow: var(--shadow-1);
}
.note-card__label {
  display: block;
  margin-bottom: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-accent);
}
.note-card p + p { margin-top: var(--space-2); }

/* ============ 图片容器（展签式） ============ */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background-color: var(--color-surface-alt);
  box-shadow: var(--shadow-2);
}
.media-frame--16x9 { aspect-ratio: 16 / 9; }
.media-frame--4x3 { aspect-ratio: 4 / 3; }
.media-frame--1x1 { aspect-ratio: 1 / 1; }
.media-frame--dark { background-color: var(--color-contrast-surface); border-color: var(--color-contrast-line); }
.media-frame__img { width: 100%; height: 100%; object-fit: cover; }
.media-frame__scrim { position: absolute; inset: 0; background-image: var(--overlay-scrim); pointer-events: none; }
.media-frame__tag { position: absolute; left: var(--space-2); bottom: var(--space-2); z-index: 2; }
.media-frame__ph {
  display: grid;
  place-items: center;
  width: 100%;
  height: 100%;
  min-height: 180px;
  padding: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-align: center;
  color: color-mix(in srgb, var(--color-ink) 46%, var(--color-surface));
  background-image: repeating-linear-gradient(45deg, color-mix(in srgb, var(--color-line) 60%, transparent) 0 1px, transparent 1px 12px);
}

/* ============ 主题筛选 ============ */
.filter-bar { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-1); }
.filter-btn {
  padding: 8px 14px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-soft);
  background-color: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  transition: transform 160ms cubic-bezier(0.2, 0.7, 0.3, 1), background-color 160ms, color 160ms, box-shadow 160ms;
}
.filter-btn:hover { transform: translateY(-2px); border-color: var(--color-primary); color: var(--color-ink); }
.filter-btn[aria-pressed="true"] {
  background-color: var(--color-accent);
  color: var(--color-accent-ink);
  border-color: var(--color-accent);
  box-shadow: var(--shadow-2);
}
.filter-status {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
  margin-inline-start: var(--space-2);
}
[data-filter-item].is-in { animation: k1-filter-in 120ms cubic-bezier(0.2, 0.7, 0.3, 1) both; }
@keyframes k1-filter-in {
  from { opacity: 0; transform: translateY(2px); }
  to { opacity: 1; transform: none; }
}

/* ============ 显现 ============ */
.js-on [data-reveal] { opacity: 0; transform: translateY(10px); }
[data-reveal].is-visible {
  opacity: 1;
  transform: none;
  transition: opacity 420ms ease, transform 420ms cubic-bezier(0.2, 0.7, 0.3, 1);
}

/* ============ 头部 ============ */
.site-header { position: relative; z-index: 80; background-color: var(--color-surface); }
.skip-link {
  position: absolute;
  top: -120px;
  left: var(--space-2);
  z-index: 200;
  padding: 10px var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-2);
  transition: top 180ms cubic-bezier(0.2, 0.7, 0.3, 1);
}
.skip-link:focus { top: var(--space-2); }

.status-strip {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}
.status-strip__inner {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding: 10px var(--gutter);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-contrast-ink);
}
.status-strip__text { animation: k1-strip-in 460ms cubic-bezier(0.2, 0.7, 0.3, 1) both; }
@keyframes k1-strip-in {
  from { opacity: 0; transform: translateX(-8px); }
  to { opacity: 1; transform: none; }
}
.status-dot {
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-contrast-accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-contrast-accent) 22%, transparent);
}

.masthead { background-color: var(--color-surface); border-bottom: var(--border-thin) solid var(--color-line); }
.masthead__grid {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding-block: var(--space-3);
}
.brand { min-width: 0; }
.brand__link { display: flex; align-items: center; gap: var(--space-2); }
.brand__mark {
  flex: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 46px;
  height: 42px;
  padding-inline: 8px;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: var(--color-primary-ink);
  background-color: var(--color-primary);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-2);
  transform: rotate(-2.4deg);
}
.brand__text { display: block; min-width: 0; }
.brand__name {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}
.brand__line {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}
.masthead__note {
  margin-inline-start: auto;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
  white-space: nowrap;
}
.masthead__cta { flex: none; }

.nav-toggle {
  display: none;
  align-items: center;
  gap: var(--space-1);
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink);
  background-color: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-1);
}
.nav-toggle__bars { display: inline-flex; flex-direction: column; gap: 3px; width: 16px; }
.nav-toggle__bars span {
  display: block;
  height: 2px;
  background-color: var(--color-primary);
  border-radius: 1px;
  transition: transform 160ms cubic-bezier(0.2, 0.7, 0.3, 1), opacity 160ms;
}
.nav-toggle[data-open] { background-color: var(--color-primary); color: var(--color-primary-ink); border-color: var(--color-primary); }
.nav-toggle[data-open] .nav-toggle__bars span { background-color: var(--color-primary-ink); }
.nav-toggle[data-open] .nav-toggle__bars span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle[data-open] .nav-toggle__bars span:nth-child(2) { opacity: 0; }
.nav-toggle[data-open] .nav-toggle__bars span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

.site-nav {
  background-color: var(--color-surface-alt);
  border-bottom: var(--border-thin) solid var(--color-line);
  box-shadow: var(--shadow-1);
}
.site-nav__list { display: flex; flex-wrap: wrap; }
.site-nav__item { position: relative; }
.site-nav__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 15px var(--space-3);
  font-size: var(--text-sm);
  border-left: var(--border-thin) solid color-mix(in srgb, var(--color-line) 70%, transparent);
  transition: background-color 160ms, transform 160ms cubic-bezier(0.2, 0.7, 0.3, 1);
}
.site-nav__link:hover { background-color: var(--color-primary-soft); transform: translateY(-2px); }
.site-nav__link[aria-current="page"] {
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  box-shadow: var(--shadow-2);
}
.site-nav__link[aria-current="page"] .site-nav__num { color: var(--color-primary-ink); }
.site-nav__num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-primary);
}
.site-nav__label { white-space: nowrap; }

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 160;
  height: 3px;
  background-color: color-mix(in srgb, var(--color-contrast-surface) 26%, transparent);
  pointer-events: none;
}
.scroll-progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background-image: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  transition: width 120ms linear;
}

/* ============ 页脚 ============ */
.site-footer {
  position: relative;
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-top: 3px solid var(--color-primary);
}
.footer__grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr 1.5fr;
  gap: var(--space-6);
  padding-block: var(--section-y);
}
.footer__col { min-width: 0; }
.footer__col--brand { padding-inline-end: var(--space-3); }
.footer__brand {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
}
.footer__tagline {
  margin-top: var(--space-1);
  margin-bottom: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: color-mix(in srgb, var(--color-contrast-ink) 72%, var(--color-contrast-surface));
}
.footer__title {
  margin-bottom: var(--space-2);
  padding-bottom: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--color-contrast-accent);
  border-bottom: 1px solid var(--color-contrast-line);
  width: 76%;
}
.footer__list { display: flex; flex-direction: column; gap: 10px; }
.footer__list--meta { gap: var(--space-2); }
.footer__link {
  font-size: var(--text-sm);
  color: color-mix(in srgb, var(--color-contrast-ink) 88%, var(--color-contrast-surface));
  border-bottom: 1px solid transparent;
  transition: color 160ms, border-color 160ms;
}
.footer__link:hover { color: var(--color-contrast-accent); border-bottom-color: var(--color-contrast-accent); }
.footer__link[aria-current="page"] { color: var(--color-contrast-accent); border-bottom-color: var(--color-contrast-accent); }
.footer__meta {
  font-size: var(--text-sm);
  line-height: 1.6;
  color: color-mix(in srgb, var(--color-contrast-ink) 76%, var(--color-contrast-surface));
}
.footer__strong { color: var(--color-contrast-ink); font-family: var(--font-mono); font-size: var(--text-sm); }
.to-top {
  margin-top: var(--space-3);
  padding: 8px 14px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-contrast-ink);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-md);
  transition: opacity 160ms, transform 160ms cubic-bezier(0.2, 0.7, 0.3, 1), border-color 160ms;
}
.to-top:hover { border-color: var(--color-contrast-accent); color: var(--color-contrast-accent); transform: translateY(-2px); }
.footer__base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding-block: var(--space-3);
  border-top: 1px solid var(--color-contrast-line);
}
.footer__legal, .footer__copy {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: color-mix(in srgb, var(--color-contrast-ink) 70%, var(--color-contrast-surface));
}

/* ============ 响应式 ============ */
@media (max-width: 1080px) {
  .masthead__note { display: none; }
  .masthead__cta { margin-inline-start: auto; }
  .footer__grid { grid-template-columns: 1fr 1fr; gap: var(--space-4); }
}
@media (max-width: 1024px) {
  .grid { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .col-3, .col-4, .col-5, .col-6, .col-7, .col-8, .col-9 { grid-column: span 6; }
}
@media (max-width: 900px) {
  .masthead__cta { display: none; }
  .nav-toggle { display: inline-flex; margin-inline-start: auto; }
  .site-nav { display: none; }
  .site-header[data-open] .site-nav { display: block; }
  .site-nav__list { flex-direction: column; }
  .site-nav__item { border-top: var(--border-thin) solid color-mix(in srgb, var(--color-line) 70%, transparent); }
  .site-nav__item:first-child { border-top: 0; }
  .site-nav__link { border-left: 0; padding: 14px var(--space-3); }
  .site-nav__link:hover { transform: none; }
  .pull-quote { margin-inline-start: var(--space-2); }
}
@media (max-width: 640px) {
  .grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .col-3, .col-4, .col-5, .col-6, .col-7, .col-8, .col-9, .col-12 { grid-column: span 2; }
  .masthead__grid { gap: var(--space-2); }
  .brand__line { display: none; }
  .footer__grid { grid-template-columns: 1fr; gap: var(--space-4); }
  .footer__col--brand { padding-inline-end: 0; }
  .footer__base { flex-direction: column; align-items: flex-start; }
  .paper { padding: var(--space-3); }
  .paper--shift-r, .paper--shift-l, .wrap--shift { margin-inline-start: 0; margin-inline-end: 0; padding-inline-start: var(--gutter); }
}

/* ============ 动效降级 ============ */
@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;
  }
  .js-on [data-reveal] { opacity: 1; transform: none; }
  .status-strip__text { animation: none; }
  .paper:hover, .btn:hover, .filter-btn:hover, .site-nav__link:hover, .to-top:hover { transform: none; }
  .scroll-progress__bar { transition: none; }
}