:root {
  --color-surface: #272628;
  --color-surface-alt: #353437;
  --color-surface-deep: #474549;
  --color-ink: #c6c2cc;
  --color-ink-soft: #9791a1;
  --color-ink-muted: #7d7788;
  --color-line: #444246;
  --color-primary: #8861cc;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #352e3f;
  --color-accent: #d8bf27;
  --color-accent-ink: #131118;
  --color-highlight: #474228;
  --color-focus: #e5c81a;
  --color-contrast-surface: #eeeef0;
  --color-contrast-ink: #323036;
  --color-contrast-line: #c5c4c7;
  --color-contrast-accent: #796b16;
  --overlay-scrim: linear-gradient(180deg, rgba(238, 238, 240, 0.35) 0%, rgba(238, 238, 240, 0.72) 55%, rgba(238, 238, 240, 0.92) 100%);
  --font-heading: STZhongsong, "Source Han Serif SC", "Songti SC", SimSun, serif;
  --font-body: "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, Menlo, Consolas, monospace;
  --text-xs: 12.2px;
  --text-sm: 15.2px;
  --text-base: 17px;
  --text-lg: 21.2px;
  --text-xl: 26.6px;
  --text-2xl: 33.2px;
  --text-3xl: 41.5px;
  --text-4xl: 51.9px;
  --text-display: clamp(48px, 9.8vw, 125px);
  --text-figure: clamp(40px, 7.0vw, 90px);
  --weight-heading: 603;
  --weight-body: 400;
  --leading-body: 1.74;
  --leading-heading: 1.15;
  --tracking-heading: 0.015em;
  --radius-sm: 7px;
  --radius-md: 8px;
  --radius-lg: 10px;
  --radius-pill: 999px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: 0 6px 18px rgba(198, 194, 204, 0.08);
  --shadow-2: 0 18px 44px rgba(198, 194, 204, 0.14);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1060px;
  --measure: 65ch;
  --gutter: 32px;
  --section-y: 87px;
  --section-y-lg: 122px;
}

/* ============ reset ============ */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 96px; }
body, h1, h2, h3, h4, h5, p, ul, ol, li, figure, blockquote, dl, dd { margin: 0; padding: 0; }
ul, ol { list-style: none; }
img, svg, video { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
table { border-collapse: collapse; }
:focus-visible { outline: 2px solid var(--color-focus); outline-offset: 2px; border-radius: 2px; }

/* ============ 全局底纹与中文排版 ============ */
body {
  --rail-w: 0px;
  min-height: 100vh;
  background-color: var(--color-surface);
  background-image:
    repeating-linear-gradient(112deg, color-mix(in srgb, var(--color-ink) 3%, transparent) 0 1px, transparent 1px 5px),
    repeating-linear-gradient(0deg, color-mix(in srgb, var(--color-accent-ink) 10%, transparent) 0 1px, transparent 1px 7px);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-body);
  line-height: var(--leading-body);
  letter-spacing: 0.012em;
  overflow-x: hidden;
}
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); }
h1 { font-size: clamp(29px, 4.2vw, var(--text-3xl)); }
h2 { font-size: clamp(25px, 3.4vw, var(--text-2xl)); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }
p { line-height: var(--leading-body); }
strong { font-weight: var(--weight-heading); color: var(--color-accent); }
::selection { background: color-mix(in srgb, var(--color-primary) 60%, transparent); color: var(--color-primary-ink); }

.display {
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 0.95;
  letter-spacing: -0.005em;
  color: var(--color-ink);
}
.figure {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  line-height: 0.88;
  letter-spacing: -0.03em;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
}
.chapter-no {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  line-height: 0.85;
  letter-spacing: -0.04em;
  color: color-mix(in srgb, var(--color-accent) 78%, var(--color-ink-muted));
  font-variant-numeric: tabular-nums;
}
.kicker {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-ink-soft);
}
.note { font-size: var(--text-xs); color: var(--color-ink-soft); line-height: 1.6; }
.source { font-size: var(--text-xs); color: var(--color-ink-muted); letter-spacing: 0.04em; }
.link { color: var(--color-accent); border-bottom: 1px solid color-mix(in srgb, var(--color-accent) 45%, transparent); padding-bottom: 1px; }
.link:hover { border-bottom-color: var(--color-accent); }

/* ============ 布局 ============ */
.container {
  width: 100%;
  max-width: calc(var(--container) + var(--gutter) * 2);
  margin-inline: auto;
  padding-inline: clamp(20px, 4vw, var(--gutter));
}
.section { padding-block: var(--section-y); }
.section-lg { padding-block: var(--section-y-lg); }
.section + .section { border-top: 1px solid var(--color-line); }
.layout { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: var(--gutter); }
.col-side { grid-column: span 2; }
.col-main { grid-column: span 10; }
.col-half { grid-column: span 6; }
.col-wide { grid-column: span 8; }
.col-narrow { grid-column: span 4; }
.stack > * + * { margin-top: var(--space-3); }
.prose { max-width: var(--measure); }
.prose p + p { margin-top: var(--space-2); }
.prose h2, .prose h3 { margin-top: var(--space-6); margin-bottom: var(--space-2); }

/* ============ 框体与色块 ============ */
.frame {
  position: relative;
  background: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  box-shadow: var(--shadow-1);
}
.frame--metal { border-color: color-mix(in srgb, var(--color-accent) 52%, var(--color-line)); }
.slab {
  background: var(--color-primary-soft);
  border: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 42%, var(--color-line));
  border-radius: var(--radius-md);
  padding: var(--space-4);
}
.slab--primary {
  background: var(--color-primary);
  border-color: color-mix(in srgb, var(--color-primary) 60%, var(--color-accent));
  color: var(--color-primary-ink);
  box-shadow: var(--shadow-2);
}
.slab--primary h2, .slab--primary h3 { color: var(--color-primary-ink); }
.invert {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-1);
}
.invert h2, .invert h3, .invert h4 { color: var(--color-contrast-ink); }
.invert .figure, .invert .chapter-no, .invert strong { color: var(--color-contrast-accent); }
.invert .kicker, .invert .note, .invert .source { color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent); }
.invert .rule { background: var(--color-contrast-line); }
.invert a { color: var(--color-contrast-accent); }
.rule { height: 1px; border: 0; margin-block: var(--space-4); background: var(--color-line); }
.rule--metal {
  background: linear-gradient(90deg,
    color-mix(in srgb, var(--color-accent) 85%, transparent) 0%,
    color-mix(in srgb, var(--color-accent) 22%, var(--color-line)) 60%,
    transparent 100%);
}
.verdict {
  margin-block: var(--space-6);
  padding: var(--space-4) var(--space-4) var(--space-4) var(--space-6);
  background: var(--color-highlight);
  border: var(--border-thin) solid color-mix(in srgb, var(--color-accent) 32%, transparent);
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius-md);
  font-size: var(--text-lg);
  line-height: 1.55;
  color: var(--color-ink);
}
.verdict p { max-width: var(--measure); }

/* ============ 条目（权重驱动高度，不做等宽矩阵） ============ */
.entry {
  position: relative;
  border-top: 1px solid var(--color-line);
  padding: var(--space-3) 0 var(--space-4);
}
.entry[data-weight="high"] {
  background: color-mix(in srgb, var(--color-primary) 9%, transparent);
  border-top-color: color-mix(in srgb, var(--color-accent) 45%, var(--color-line));
  padding: var(--space-4) var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
}
.entry[data-weight="high"] h3 { font-size: var(--text-2xl); }
.entry[data-weight="low"] { padding-block: var(--space-2) var(--space-3); }
.entry[data-weight="low"] h3 { font-size: var(--text-base); font-family: var(--font-body); font-weight: var(--weight-body); color: var(--color-ink-soft); }
.entry-no {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-accent);
}

/* ============ 标签 / 筛选 ============ */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border: var(--border-thin) solid color-mix(in srgb, var(--color-accent) 40%, var(--color-line));
  border-radius: var(--radius-pill);
  background: color-mix(in srgb, var(--color-accent) 8%, transparent);
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  line-height: 1.9;
}
.chip--static { pointer-events: none; }
button.chip { color: var(--color-ink-soft); border-color: var(--color-line); background: transparent; }
button.chip:hover { color: var(--color-ink); border-color: color-mix(in srgb, var(--color-accent) 40%, var(--color-line)); }
button.chip[aria-pressed="true"], .chip.is-active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}
.chip-row { display: flex; flex-wrap: wrap; gap: var(--space-1); }

/* ============ 数据表 ============ */
.data-table { width: 100%; font-family: var(--font-mono); font-size: var(--text-sm); }
.data-table th, .data-table td { padding: 11px var(--space-2); border-bottom: 1px solid var(--color-line); text-align: left; vertical-align: top; }
.data-table thead th { font-family: var(--font-body); font-size: var(--text-xs); letter-spacing: 0.16em; color: var(--color-ink-soft); font-weight: var(--weight-body); }
.data-table td.num, .data-table th.num { text-align: right; color: var(--color-accent); font-variant-numeric: tabular-nums; }
.data-table tbody tr:hover { background: color-mix(in srgb, var(--color-primary) 13%, transparent); }
.row-note {
  display: block;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  margin-top: 0;
  color: var(--color-ink-soft);
  font-size: var(--text-xs);
  line-height: 1.6;
  transition: max-height 0.22s ease, opacity 0.22s ease, margin-top 0.22s ease;
}
tr:hover .row-note, tr:focus-within .row-note { max-height: 8em; opacity: 1; margin-top: 6px; }

/* ============ 图片容器 ============ */
.media {
  position: relative;
  overflow: hidden;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface-alt);
}
.media img { width: 100%; height: 100%; object-fit: cover; aspect-ratio: 16 / 10; }
.media--tall img { aspect-ratio: 4 / 5; }
.media--wide img { aspect-ratio: 21 / 9; }
.media-scrim { position: absolute; inset: 0; background: var(--overlay-scrim); pointer-events: none; }
.media:hover .media-scrim { background: var(--overlay-scrim); filter: saturate(1.05) brightness(0.94); }
.media-body {
  position: absolute;
  inset: auto 0 0 0;
  padding: var(--space-4);
  color: var(--color-contrast-ink);
  max-width: var(--measure);
}
.media-body h3 { color: var(--color-contrast-ink); }
.media-cap {
  position: absolute;
  top: var(--space-2);
  left: var(--space-2);
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  background: color-mix(in srgb, var(--color-accent) 88%, transparent);
  color: var(--color-accent-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
}
.media-placeholder {
  display: grid;
  place-items: center;
  aspect-ratio: 16 / 10;
  background:
    repeating-linear-gradient(45deg, color-mix(in srgb, var(--color-line) 60%, transparent) 0 1px, transparent 1px 10px),
    var(--color-surface-alt);
  color: var(--color-ink-muted);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
}

/* ============ 按钮 ============ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 11px 20px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-surface-deep);
  color: var(--color-ink);
  font-size: var(--text-sm);
  letter-spacing: 0.05em;
  line-height: 1.2;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn--sm { padding: 8px 14px; font-size: var(--text-xs); letter-spacing: 0.1em; }
.btn--primary { background: var(--color-primary); border-color: color-mix(in srgb, var(--color-primary) 62%, var(--color-accent)); color: var(--color-primary-ink); }
.btn--primary:hover { background: color-mix(in srgb, var(--color-primary) 86%, var(--color-accent)); }
.btn--accent { background: var(--color-accent); border-color: var(--color-accent); color: var(--color-accent-ink); }
.btn--accent:hover { background: color-mix(in srgb, var(--color-accent) 86%, var(--color-ink)); }
.btn--ghost { background: transparent; }
.btn--ghost:hover { border-color: color-mix(in srgb, var(--color-accent) 50%, var(--color-line)); color: var(--color-accent); }

/* ============ 面包屑 ============ */
.crumbs { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: 0.08em; color: var(--color-ink-soft); }
.crumbs li { display: inline-flex; align-items: center; gap: 8px; }
.crumbs li + li::before { content: "/"; color: var(--color-line); }
.crumbs a:hover { color: var(--color-accent); }
.crumbs [aria-current="page"] { color: var(--color-accent); }

/* ============ 头部 ============ */
.skip-link {
  position: absolute;
  left: var(--space-2);
  top: -72px;
  z-index: 200;
  padding: 10px 16px;
  background: var(--color-accent);
  color: var(--color-accent-ink);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  transition: top 0.18s ease;
}
.skip-link:focus { top: var(--space-2); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background-color: color-mix(in srgb, var(--color-surface-alt) 94%, var(--color-surface));
  border-bottom: var(--border-thin) solid var(--color-line);
  box-shadow: 0 10px 26px rgba(19, 17, 24, 0.34);
}
.rail-inner {
  width: 100%;
  max-width: calc(var(--container) + var(--gutter) * 2);
  margin-inline: auto;
  padding: var(--space-2) clamp(20px, 4vw, var(--gutter));
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}
.brand-block { display: flex; align-items: center; gap: var(--space-3); min-width: 0; }
.brand { display: inline-flex; align-items: center; gap: 12px; }
.brand-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  flex: none;
  border: var(--border-thin) solid color-mix(in srgb, var(--color-accent) 58%, var(--color-line));
  border-radius: var(--radius-sm);
  background: var(--color-surface-deep);
  color: var(--color-accent);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  line-height: 1;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-name { font-family: var(--font-heading); font-size: var(--text-lg); letter-spacing: 0.06em; color: var(--color-ink); }
.brand-sub { font-size: var(--text-xs); letter-spacing: 0.14em; color: var(--color-ink-soft); }
.brand-node {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-accent);
  border-left: 1px solid color-mix(in srgb, var(--color-accent) 45%, var(--color-line));
  padding-left: 12px;
}
.brand-node-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--color-accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-accent) 22%, transparent); }

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 9px 14px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-surface-deep);
  color: var(--color-ink);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
}
.nav-toggle-bars { display: grid; gap: 4px; width: 18px; }
.nav-toggle-bars i { display: block; height: 1px; background: currentColor; transition: transform 0.2s ease, opacity 0.2s ease; }
.nav-toggle[aria-expanded="true"] { color: var(--color-accent); border-color: color-mix(in srgb, var(--color-accent) 55%, var(--color-line)); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

.nav-close {
  display: inline-flex;
  margin-bottom: var(--space-4);
  padding: 8px 12px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  color: var(--color-ink-soft);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
}
.nav-close:hover { color: var(--color-accent); border-color: color-mix(in srgb, var(--color-accent) 50%, var(--color-line)); }

.site-nav {
  position: fixed;
  inset: 0 auto 0 0;
  width: min(86vw, 330px);
  z-index: 70;
  padding: var(--space-6) var(--space-3) var(--space-4);
  overflow-y: auto;
  background: var(--color-surface-alt);
  border-right: var(--border-thin) solid color-mix(in srgb, var(--color-accent) 38%, var(--color-line));
  transform: translateX(-102%);
  transition: transform 0.3s ease;
}
.site-nav[data-open] { transform: none; box-shadow: var(--shadow-2); }
.nav-list { display: flex; flex-direction: column; border-left: 1px solid var(--color-line); }
.nav-link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 12px 12px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  transition: color 0.18s ease, background-color 0.18s ease;
}
.nav-link:hover { color: var(--color-ink); background: color-mix(in srgb, var(--color-primary) 16%, transparent); }
.nav-tick {
  position: absolute;
  left: -1px;
  top: 50%;
  width: 2px;
  height: 0;
  background: var(--color-accent);
  transform: translateY(-50%);
  transition: height 0.2s ease;
}
.nav-link[aria-current="page"] { color: var(--color-accent); background: var(--color-primary-soft); }
.nav-link[aria-current="page"] .nav-tick { height: 22px; }
.nav-meta { margin-top: var(--space-4); padding-left: 20px; font-family: var(--font-mono); font-size: var(--text-xs); line-height: 1.7; color: var(--color-ink-muted); }
.nav-cta { margin-top: var(--space-3); margin-left: 20px; }

/* ============ 页脚 ============ */
.site-footer {
  position: relative;
  margin-top: var(--section-y);
  padding-top: var(--space-4);
  padding-bottom: var(--space-4);
  background-image: linear-gradient(180deg, var(--color-surface) 0%, color-mix(in srgb, var(--color-surface-alt) 80%, var(--color-surface)) 100%);
  border-top: var(--border-thin) solid color-mix(in srgb, var(--color-accent) 45%, var(--color-line));
  color: var(--color-ink);
}
.footer-rule {
  height: 12px;
  margin-bottom: var(--space-6);
  background-image: repeating-linear-gradient(90deg,
    color-mix(in srgb, var(--color-accent) 62%, transparent) 0 1px,
    transparent 1px calc(100% / 12));
  background-repeat: no-repeat;
  background-size: 100% 9px;
  background-position: top left;
  border-top: var(--border-thin) solid color-mix(in srgb, var(--color-accent) 62%, var(--color-line));
}
.footer-brand { display: flex; flex-wrap: wrap; align-items: baseline; gap: var(--space-3); padding-bottom: var(--space-4); }
.footer-brand-name { font-family: var(--font-heading); font-size: var(--text-xl); letter-spacing: 0.1em; color: var(--color-ink); }
.footer-brand-tag { font-size: var(--text-xs); letter-spacing: 0.16em; color: var(--color-ink-soft); }
.footer-grid {
  display: grid;
  grid-template-columns: 1.05fr 1.25fr 1fr;
  gap: var(--space-6);
  padding-block: var(--space-4) var(--space-6);
  border-top: 1px solid var(--color-line);
}
.footer-col { position: relative; padding-top: var(--space-2); }
.footer-title { font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: 0.2em; color: var(--color-accent); margin-bottom: var(--space-2); }
.footer-links { display: flex; flex-direction: column; gap: 9px; }
.footer-links a { font-size: var(--text-sm); color: var(--color-ink); border-bottom: 1px solid transparent; width: fit-content; }
.footer-links a:hover { color: var(--color-accent); border-bottom-color: color-mix(in srgb, var(--color-accent) 50%, transparent); }
.footer-links--minor { margin-top: var(--space-3); padding-top: var(--space-2); border-top: 1px solid var(--color-line); }
.footer-links--minor a { font-size: var(--text-xs); color: var(--color-ink-soft); }
.footer-node {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: var(--space-2) var(--space-3);
  margin-bottom: var(--space-3);
  background: var(--color-highlight);
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius-sm);
}
.footer-node-label { font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: 0.14em; color: var(--color-ink-soft); }
.footer-node-value { font-family: var(--font-mono); font-size: var(--text-sm); letter-spacing: 0.04em; color: var(--color-accent); }
.footer-text { font-size: var(--text-sm); color: var(--color-ink-soft); line-height: 1.7; max-width: 40ch; }
.footer-text--muted { margin-top: var(--space-3); font-size: var(--text-xs); color: var(--color-ink-muted); }
.footer-chips { display: flex; flex-wrap: wrap; gap: var(--space-1); margin-top: var(--space-3); }
.footer-links-line { margin-block: var(--space-2) var(--space-3); font-size: var(--text-sm); }
.footer-copy-status { min-height: 1.4em; margin-top: var(--space-1); font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-accent); }
.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-4);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-line);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-ink-muted);
}
.footer-bottom-item { display: inline-flex; align-items: center; gap: 6px; }

/* ============ 工具类 ============ */
.scroll-progress {
  position: fixed;
  top: 0;
  left: var(--rail-w);
  right: 0;
  height: 2px;
  z-index: 90;
  background: color-mix(in srgb, var(--color-line) 55%, transparent);
  pointer-events: none;
}
.scroll-progress i { display: block; width: 100%; height: 100%; transform: scaleX(0); transform-origin: 0 50%; background: linear-gradient(90deg, var(--color-primary), var(--color-accent)); }
.to-top {
  position: fixed;
  right: var(--space-3);
  bottom: var(--space-3);
  z-index: 80;
  padding: 10px 16px;
  border: var(--border-thin) solid color-mix(in srgb, var(--color-accent) 45%, var(--color-line));
  border-radius: var(--radius-pill);
  background: color-mix(in srgb, var(--color-surface-deep) 92%, transparent);
  color: var(--color-ink);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.24s ease, transform 0.24s ease, visibility 0.24s ease;
}
.to-top.is-visible { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { color: var(--color-accent); }
[data-reveal] { opacity: 0; transform: translateY(14px); }
[data-reveal].is-visible { opacity: 1; transform: none; transition: opacity 0.5s ease, transform 0.5s ease; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }

/* ============ 平板 ============ */
@media (max-width: 1023.98px) {
  .col-side, .col-main, .col-half, .col-wide, .col-narrow { grid-column: 1 / -1; }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-col:first-child { grid-column: 1 / -1; }
}

/* ============ 桌面：侧边轨道导航 ============ */
@media (min-width: 1024px) {
  body { --rail-w: 236px; padding-left: var(--rail-w); }
  .site-header {
    position: fixed;
    inset: 0 auto 0 0;
    width: var(--rail-w);
    border-bottom: 0;
    border-right: var(--border-thin) solid var(--color-line);
    background-image: linear-gradient(180deg, var(--color-surface-alt) 0%, var(--color-surface) 100%);
    box-shadow: inset -1px 0 0 color-mix(in srgb, var(--color-accent) 26%, transparent);
    overflow-y: auto;
  }
  .rail-inner {
    max-width: none;
    height: 100%;
    padding: var(--space-6) var(--space-3) var(--space-4);
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: var(--space-6);
  }
  .brand-block { flex-direction: column; align-items: flex-start; gap: var(--space-2); }
  .brand-node { border-left: 0; padding-left: 0; border-top: 1px solid color-mix(in srgb, var(--color-accent) 35%, var(--color-line)); padding-top: var(--space-2); font-size: 11px; }
  .nav-toggle { display: none; }
  .nav-close { display: none; }
  .site-nav {
    position: static;
    width: auto;
    inset: auto;
    padding: 0;
    overflow: visible;
    background: none;
    border-right: 0;
    transform: none;
    box-shadow: none;
  }
  .site-nav[data-open] { box-shadow: none; }
  .nav-list { border-left: 1px solid var(--color-line); }
  .nav-meta { padding-left: 20px; }
  .nav-cta { margin-left: 20px; align-self: flex-start; }
  .footer-grid { grid-template-columns: 1.05fr 1.25fr 1fr; }
}

/* ============ 手机 ============ */
@media (max-width: 640px) {
  h1 { font-size: clamp(26px, 7vw, var(--text-2xl)); }
  .brand-sub { display: none; }
  .brand-node { display: none; }
  .nav-toggle-text { display: none; }
  .footer-grid { grid-template-columns: 1fr; gap: var(--space-4); }
  .footer-brand { gap: var(--space-1); }
  .footer-bottom { flex-direction: column; gap: 8px; }
  .verdict { padding: var(--space-3); font-size: var(--text-base); }
  .invert { padding: var(--space-4); }
  .frame, .slab { padding: var(--space-3); }
  .to-top { right: var(--space-2); bottom: var(--space-2); }
}

/* ============ 动效偏好 ============ */
@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;
  }
  [data-reveal] { opacity: 1 !important; transform: none !important; }
  .btn:hover { transform: none; }
}