:root {
  --color-surface: #26252a;
  --color-surface-alt: #343339;
  --color-surface-deep: #45444b;
  --color-ink: #c3c0ce;
  --color-ink-soft: #928ea4;
  --color-ink-muted: #77738c;
  --color-line: #424148;
  --color-primary: #7760e2;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #312d44;
  --color-accent: #a7e619;
  --color-accent-ink: #121118;
  --color-highlight: #3d4827;
  --color-focus: #acf20d;
  --color-contrast-surface: #edecef;
  --color-contrast-ink: #313036;
  --color-contrast-line: #c4c3c6;
  --color-contrast-accent: #54730d;
  --overlay-scrim: linear-gradient(180deg, rgba(237, 236, 239, 0.35) 0%, rgba(237, 236, 239, 0.72) 55%, rgba(237, 236, 239, 0.92) 100%);
  --font-heading: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-body: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --text-xs: 11.0px;
  --text-sm: 14.7px;
  --text-base: 17px;
  --text-lg: 22.7px;
  --text-xl: 30.2px;
  --text-2xl: 40.3px;
  --text-3xl: 53.7px;
  --text-4xl: 71.5px;
  --text-display: clamp(37px, 7.6vw, 97px);
  --text-figure: clamp(31px, 5.5vw, 70px);
  --weight-heading: 678;
  --weight-body: 400;
  --leading-body: 1.78;
  --leading-heading: 1.26;
  --tracking-heading: -0.003em;
  --radius-sm: 10px;
  --radius-md: 12px;
  --radius-lg: 13px;
  --radius-pill: 999px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: 0 0 0 1px rgba(167, 230, 25, 0.35);
  --shadow-2: 0 0 28px rgba(167, 230, 25, 0.35);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1160px;
  --measure: 73ch;
  --gutter: 16px;
  --section-y: 102px;
  --section-y-lg: 143px;
}

/* ============================================================
   1. Reset / 基础
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100%;
  background-color: var(--color-surface);
  background-image:
    radial-gradient(1100px 620px at 6% -14%, color-mix(in srgb, var(--color-primary) 28%, transparent), transparent 68%),
    radial-gradient(900px 520px at 98% 2%, color-mix(in srgb, var(--color-accent) 11%, transparent), transparent 70%),
    radial-gradient(820px 820px at 50% 120%, color-mix(in srgb, var(--color-primary) 18%, transparent), transparent 72%);
  background-repeat: no-repeat;
  background-attachment: fixed;
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-body);
  line-height: var(--leading-body);
  overflow-x: hidden;
}

/* 扫描线 / 微弱噪点质感 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 4;
  pointer-events: none;
  opacity: 0.45;
  background-image: repeating-linear-gradient(
    180deg,
    color-mix(in srgb, var(--color-ink) 7%, transparent) 0 1px,
    transparent 1px 4px
  );
}

img, svg, video { display: block; max-width: 100%; }
img { height: auto; }
ul, ol { margin: 0; padding: 0; }
li { list-style: none; }
button { background: none; border: 0; color: inherit; font: inherit; }
input, select, textarea { font: inherit; color: inherit; }
main { display: block; }
#main-content { scroll-margin-top: 112px; }

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

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

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

/* ============================================================
   2. 排版
   ============================================================ */
h1, h2, h3, h4, h5 {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: color-mix(in srgb, var(--color-ink) 70%, var(--color-primary-ink));
  text-wrap: balance;
  word-break: break-word;
}

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

p { margin: 0 0 var(--space-2); }
strong { font-weight: 700; color: color-mix(in srgb, var(--color-ink) 76%, var(--color-primary-ink)); }

.display {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-display);
  line-height: 1.02;
  letter-spacing: -0.022em;
  color: color-mix(in srgb, var(--color-ink) 64%, var(--color-primary-ink));
}

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

.eyebrow {
  display: inline-block;
  margin: 0 0 var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.lede {
  max-width: var(--measure);
  font-size: var(--text-lg);
  line-height: 1.6;
  color: var(--color-ink-soft);
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.muted { color: var(--color-ink-soft); }
.text-accent { color: var(--color-accent); }

/* ============================================================
   3. 布局骨架
   ============================================================ */
.shell {
  width: min(var(--container), calc(100% - 2 * var(--space-2)));
  margin-inline: auto;
}

.section { padding-block: var(--section-y); }
.section--lg { padding-block: var(--section-y-lg); }
.section--tight { padding-block: var(--space-6); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-2) var(--space-3);
  padding-bottom: var(--space-2);
  margin-bottom: var(--space-4);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.section-head h2 { margin: 0; }
.section-head p { margin: 0; max-width: 52ch; color: var(--color-ink-soft); font-size: var(--text-sm); }

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

.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-12 { grid-column: span 12; }

.card-grid {
  display: grid;
  gap: var(--gutter);
  grid-template-columns: repeat(auto-fill, minmax(272px, 1fr));
}

.rail-layout {
  display: grid;
  grid-template-columns: 200px minmax(0, 1fr);
  gap: var(--space-6);
  align-items: start;
}

.rail {
  position: sticky;
  top: 104px;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding-left: var(--space-2);
  border-left: var(--border-thin) solid var(--color-line);
}

.rail-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.rail-link {
  display: block;
  padding: 6px 0;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  transition: color 0.18s ease, padding-left 0.18s ease;
}
.rail-link:hover { color: var(--color-ink); text-decoration: none; padding-left: 4px; }
.rail-link[aria-current="true"] { color: var(--color-accent); }

.rule {
  height: 1px;
  margin: 0;
  border: 0;
  background: var(--color-line);
}
.rule--accent {
  background: linear-gradient(90deg, var(--color-accent), transparent);
}

/* ============================================================
   4. 按钮
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  padding: 12px 20px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background: color-mix(in srgb, var(--color-surface-deep) 72%, transparent);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition: background-color 0.18s ease, border-color 0.18s ease, color 0.18s ease,
    box-shadow 0.18s ease, transform 0.18s ease;
}
.btn:hover {
  text-decoration: none;
  border-color: color-mix(in srgb, var(--color-primary) 62%, var(--color-line));
  box-shadow: var(--shadow-1);
}
.btn:active { transform: translateY(1px); }

.btn--sm { padding: 9px 16px; font-size: var(--text-xs); letter-spacing: 0.08em; }
.btn--block { width: 100%; }

.btn--accent {
  background: var(--color-accent);
  border-color: color-mix(in srgb, var(--color-accent) 62%, var(--color-surface));
  color: var(--color-accent-ink);
  font-weight: 700;
}
.btn--accent:hover {
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--color-accent) 58%, transparent),
    0 0 24px color-mix(in srgb, var(--color-accent) 38%, transparent);
}

.btn--primary {
  background: var(--color-primary);
  border-color: color-mix(in srgb, var(--color-primary) 72%, transparent);
  color: var(--color-primary-ink);
}

.btn--ghost { background: transparent; }

/* ============================================================
   5. 标签 / 条目 / 面板
   ============================================================ */
.tag-row { display: flex; flex-wrap: wrap; gap: var(--space-1); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background: color-mix(in srgb, var(--color-surface-deep) 55%, transparent);
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  white-space: nowrap;
}
.tag--accent {
  border-color: color-mix(in srgb, var(--color-accent) 46%, transparent);
  background: color-mix(in srgb, var(--color-highlight) 70%, transparent);
  color: var(--color-accent);
}
.tag--primary {
  border-color: color-mix(in srgb, var(--color-primary) 52%, transparent);
  background: var(--color-primary-soft);
  color: color-mix(in srgb, var(--color-ink) 80%, var(--color-primary-ink));
}

.entry-list {
  display: flex;
  flex-direction: column;
  border-top: var(--border-thin) solid var(--color-line);
}
.entry {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: baseline;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-1);
  border-bottom: var(--border-thin) solid var(--color-line);
  transition: background-color 0.18s ease;
}
.entry:hover { background: color-mix(in srgb, var(--color-primary-soft) 42%, transparent); }
.entry-index {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-accent);
}
.entry-title {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: 1.4;
  color: color-mix(in srgb, var(--color-ink) 72%, var(--color-primary-ink));
}
.entry-desc { margin-top: 4px; font-size: var(--text-sm); color: var(--color-ink-soft); }
.entry-meta {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  white-space: nowrap;
}

.panel {
  position: relative;
  padding: var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background:
    linear-gradient(158deg,
      color-mix(in srgb, var(--color-surface-alt) 90%, transparent),
      color-mix(in srgb, var(--color-surface) 96%, transparent));
}

.panel--deep {
  background: color-mix(in srgb, var(--color-surface-deep) 66%, transparent);
}

.panel--glow {
  border-color: color-mix(in srgb, var(--color-primary) 52%, var(--color-line));
  box-shadow: var(--shadow-1), var(--shadow-2);
}

.panel--contrast {
  border-color: var(--color-contrast-line);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.panel--contrast h2, .panel--contrast h3, .panel--contrast h4 { color: var(--color-contrast-ink); }
.panel--contrast .metric-value,
.panel--contrast .stat-figure { color: var(--color-contrast-accent); }
.panel--contrast .metric-label,
.panel--contrast .eyebrow,
.panel--contrast .metric-note { color: color-mix(in srgb, var(--color-contrast-ink) 66%, transparent); }
.panel--contrast .rule,
.panel--contrast .panel-head { border-color: var(--color-contrast-line); }

.panel-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-1) var(--space-2);
  padding-bottom: var(--space-2);
  margin-bottom: var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-line);
}
.panel-title {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  letter-spacing: var(--tracking-heading);
}

.metric { display: flex; flex-direction: column; gap: 6px; }
.metric-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}
.metric-value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: var(--text-xl);
  line-height: 1;
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums;
  color: var(--color-accent);
}
.metric-note { font-size: var(--text-xs); color: var(--color-ink-muted); }

/* ============================================================
   6. 主题筛选 / 概率条
   ============================================================ */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
}

.filter-btn {
  appearance: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 15px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background: color-mix(in srgb, var(--color-surface-alt) 52%, transparent);
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  cursor: pointer;
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease,
    box-shadow 0.18s ease;
}
.filter-btn:hover {
  color: var(--color-ink);
  border-color: color-mix(in srgb, var(--color-primary) 55%, var(--color-line));
}
.filter-btn[aria-pressed="true"] {
  background: var(--color-primary-soft);
  border-color: color-mix(in srgb, var(--color-primary) 66%, transparent);
  color: var(--color-primary-ink);
  box-shadow: var(--shadow-1);
}

.filter-item[hidden] { display: none !important; }

.filter-empty {
  display: none;
  margin: var(--space-2) 0 0;
  padding: var(--space-3);
  border: var(--border-thin) dashed var(--color-line);
  border-radius: var(--radius-md);
  color: var(--color-ink-muted);
  font-size: var(--text-sm);
  text-align: center;
}
.filter-empty[data-visible] { display: block; }

.bar {
  position: relative;
  height: 6px;
  border: var(--border-thin) solid color-mix(in srgb, var(--color-line) 82%, transparent);
  border-radius: var(--radius-pill);
  background: color-mix(in srgb, var(--color-surface-deep) 78%, transparent);
  overflow: hidden;
}
.bar-fill {
  display: block;
  width: var(--bar-value, 0%);
  height: 100%;
  background: linear-gradient(90deg,
    color-mix(in srgb, var(--color-primary) 88%, transparent),
    var(--color-accent));
  transition: width 0.8s cubic-bezier(0.2, 0.7, 0.2, 1);
}
.bar:hover .bar-fill { filter: brightness(1.12); }

.pulse-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
  animation: sn-breathe 2.6s ease-in-out infinite;
}

@keyframes sn-breathe {
  0%, 100% {
    opacity: 0.55;
    box-shadow: 0 0 0 0 color-mix(in srgb, var(--color-accent) 42%, transparent);
  }
  50% {
    opacity: 1;
    box-shadow: 0 0 12px 2px color-mix(in srgb, var(--color-accent) 30%, transparent);
  }
}

/* ============================================================
   7. 图片容器
   ============================================================ */
.figure-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  background: color-mix(in srgb, var(--color-surface-alt) 92%, transparent);
}
.figure-frame--wide { aspect-ratio: 21 / 9; }
.figure-frame--square { aspect-ratio: 1 / 1; }

.figure-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.5) contrast(1.08);
}

.figure-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(165deg,
    color-mix(in srgb, var(--color-primary) 34%, transparent),
    color-mix(in srgb, var(--color-surface) 78%, transparent));
}

.figure-cap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  margin: 0;
  padding: 10px var(--space-2);
  border-top: var(--border-thin) solid var(--color-contrast-line);
  background: var(--overlay-scrim);
  color: var(--color-contrast-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
}

/* ============================================================
   8. 面包屑 / 正文
   ============================================================ */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}
.breadcrumb a { color: var(--color-ink-soft); transition: color 0.18s ease; }
.breadcrumb a:hover { color: var(--color-accent); text-decoration: none; }
.breadcrumb-sep { opacity: 0.7; }
.breadcrumb [aria-current="page"] { color: var(--color-ink); }

.prose { max-width: var(--measure); }
.prose h2 { margin-top: var(--space-6); }
.prose h3 { margin-top: var(--space-4); }
.prose p { margin: 0 0 var(--space-2); }
.prose ul, .prose ol { margin: 0 0 var(--space-3); }
.prose li {
  position: relative;
  padding-left: var(--space-3);
  margin-bottom: var(--space-1);
}
.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 1px;
  background: var(--color-accent);
}
.prose a {
  color: color-mix(in srgb, var(--color-accent) 82%, var(--color-ink));
  border-bottom: var(--border-thin) solid color-mix(in srgb, var(--color-accent) 45%, transparent);
}
.prose a:hover { text-decoration: none; border-bottom-color: var(--color-accent); }
.prose blockquote {
  margin: var(--space-3) 0;
  padding: var(--space-2) var(--space-3);
  border-left: var(--border-thin) solid var(--color-primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: color-mix(in srgb, var(--color-primary-soft) 60%, transparent);
  color: var(--color-ink-soft);
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-accent);
  font-size: var(--text-sm);
  font-weight: 600;
  border-bottom: var(--border-thin) solid transparent;
  transition: border-color 0.18s ease, color 0.18s ease;
}
.link-arrow::after { content: "→"; font-family: var(--font-mono); }
.link-arrow:hover { text-decoration: none; border-bottom-color: var(--color-accent); }

/* ============================================================
   9. 头部
   ============================================================ */
.skip-link {
  position: fixed;
  top: -80px;
  left: var(--space-2);
  z-index: 220;
  padding: 10px 16px;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  color: var(--color-accent-ink);
  font-size: var(--text-sm);
  font-weight: 700;
  transition: top 0.18s ease;
}
.skip-link:focus { top: var(--space-2); text-decoration: none; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  padding-block: var(--space-1);
}
.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg,
    color-mix(in srgb, var(--color-surface) 94%, transparent),
    transparent);
}

.header-shell {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  width: min(var(--container), calc(100% - 2 * var(--space-2)));
  margin-inline: auto;
  padding: 10px 10px 10px var(--space-2);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background: color-mix(in srgb, var(--color-surface-alt) 76%, transparent);
  box-shadow: 0 18px 40px color-mix(in srgb, var(--color-accent-ink) 52%, transparent);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
  transition: border-color 0.22s ease, box-shadow 0.22s ease;
}
.site-header[data-scrolled] .header-shell {
  border-color: color-mix(in srgb, var(--color-primary) 44%, var(--color-line));
  box-shadow: 0 20px 46px color-mix(in srgb, var(--color-accent-ink) 62%, transparent),
    0 0 0 1px color-mix(in srgb, var(--color-primary) 22%, transparent);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}
.brand:hover { text-decoration: none; }

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border: var(--border-thin) solid color-mix(in srgb, var(--color-accent) 55%, transparent);
  border-radius: var(--radius-sm);
  background: linear-gradient(150deg,
    color-mix(in srgb, var(--color-primary) 58%, transparent),
    color-mix(in srgb, var(--color-surface-deep) 92%, transparent));
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.06em;
}
.brand-mark--sm { width: 26px; height: 26px; font-size: 10px; }

.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-name {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-sm);
  letter-spacing: var(--tracking-heading);
  color: color-mix(in srgb, var(--color-ink) 72%, var(--color-primary-ink));
  white-space: nowrap;
}
.brand-meta {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.nav-capsule { margin-inline: auto; }
.nav-list { display: flex; align-items: center; gap: 2px; }
.nav-list > li { display: flex; }

.nav-link {
  display: inline-flex;
  align-items: center;
  padding: 9px 14px;
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-pill);
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  letter-spacing: 0.01em;
  white-space: nowrap;
  transition: color 0.18s ease, background-color 0.18s ease, border-color 0.18s ease,
    box-shadow 0.18s ease;
}
.nav-link:hover {
  color: var(--color-ink);
  background: color-mix(in srgb, var(--color-surface-deep) 58%, transparent);
  text-decoration: none;
}
.nav-link[aria-current="page"] {
  color: var(--color-primary-ink);
  background: var(--color-primary-soft);
  border-color: color-mix(in srgb, var(--color-primary) 62%, transparent);
  box-shadow: 0 0 18px color-mix(in srgb, var(--color-primary) 32%, transparent);
}

.header-tools {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  margin-left: auto;
  flex: 0 0 auto;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background: color-mix(in srgb, var(--color-surface-deep) 68%, transparent);
  color: var(--color-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  cursor: pointer;
  transition: border-color 0.18s ease, color 0.18s ease;
}
.nav-toggle:hover { border-color: color-mix(in srgb, var(--color-primary) 55%, var(--color-line)); }

.nav-toggle-bars { position: relative; width: 16px; height: 10px; }
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 1.5px;
  border-radius: 2px;
  background: currentColor;
  transition: transform 0.2s ease, top 0.2s ease, bottom 0.2s ease;
}
.nav-toggle-bars::before { top: 0; }
.nav-toggle-bars::after { bottom: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before { top: 4px; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after { bottom: 4.5px; transform: rotate(-45deg); }

.scroll-progress {
  position: absolute;
  left: var(--space-3);
  right: var(--space-3);
  bottom: -5px;
  height: 2px;
  border-radius: var(--radius-pill);
  background: color-mix(in srgb, var(--color-line) 70%, transparent);
  overflow: hidden;
}
.scroll-progress-fill {
  display: block;
  width: 0;
  height: 100%;
  border-radius: var(--radius-pill);
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
}

/* ============================================================
   10. 页脚
   ============================================================ */
.site-footer {
  position: relative;
  z-index: 2;
  margin-top: var(--space-8);
  border-top: var(--border-thin) solid var(--color-line);
  background: linear-gradient(180deg,
    color-mix(in srgb, var(--color-surface-alt) 42%, transparent),
    color-mix(in srgb, var(--color-surface) 84%, transparent));
}

.footer-shell {
  width: min(var(--container), calc(100% - 2 * var(--space-2)));
  margin-inline: auto;
  padding-block: var(--space-3);
  font-size: var(--text-sm);
}

.footer-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2) var(--space-3);
}
.footer-row + .footer-row {
  margin-top: var(--space-2);
  padding-top: var(--space-2);
  border-top: var(--border-thin) solid var(--color-line);
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: color-mix(in srgb, var(--color-ink) 74%, var(--color-primary-ink));
}
.footer-brand:hover { text-decoration: none; }
.footer-brand-text {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-3);
}
.footer-links a {
  padding-bottom: 2px;
  border-bottom: var(--border-thin) solid transparent;
  color: var(--color-ink-soft);
  transition: color 0.18s ease, border-color 0.18s ease;
}
.footer-links a:hover {
  color: var(--color-accent);
  border-bottom-color: color-mix(in srgb, var(--color-accent) 60%, transparent);
  text-decoration: none;
}

.footer-contact {
  display: flex;
  flex-wrap: wrap;
  gap: 6px var(--space-3);
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}
.footer-contact-item { display: inline-flex; align-items: center; gap: 6px; }
.footer-contact-key {
  padding: 2px 7px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  color: var(--color-ink-soft);
  letter-spacing: 0.08em;
}

.footer-legal {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

/* ============================================================
   11. 响应式
   ============================================================ */
@media (max-width: 980px) {
  .nav-toggle { display: inline-flex; }

  .nav-capsule {
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    right: 0;
    margin: 0;
    padding: var(--space-2);
    border: var(--border-thin) solid var(--color-line);
    border-radius: var(--radius-lg);
    background: color-mix(in srgb, var(--color-surface-alt) 96%, transparent);
    box-shadow: 0 24px 48px color-mix(in srgb, var(--color-accent-ink) 62%, transparent);
    -webkit-backdrop-filter: blur(18px);
    backdrop-filter: blur(18px);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s ease;
  }
  .nav-capsule[data-open] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
  }

  .nav-list { flex-direction: column; align-items: stretch; gap: 4px; }
  .nav-link {
    width: 100%;
    padding: 13px 14px;
    border-radius: var(--radius-sm);
    font-size: var(--text-base);
  }
  .nav-link[aria-current="page"] { box-shadow: none; }

  .rail-layout { grid-template-columns: minmax(0, 1fr); gap: var(--space-3); }
  .rail {
    position: static;
    flex-direction: row;
    flex-wrap: wrap;
    gap: var(--space-1) var(--space-2);
    padding-left: 0;
    padding-top: var(--space-1);
    border-left: 0;
    border-top: var(--border-thin) solid var(--color-line);
  }

  .col-3, .col-4, .col-5 { grid-column: span 6; }
  .col-7, .col-8 { grid-column: span 12; }
}

@media (max-width: 760px) {
  .section { padding-block: var(--space-8); }
  .section--lg { padding-block: var(--space-8); }
  .footer-row { justify-content: flex-start; }
}

@media (max-width: 620px) {
  .header-shell { padding: 8px 8px 8px 12px; gap: var(--space-1); }
  .brand-name { font-size: var(--text-xs); }
  .brand-meta { letter-spacing: 0.14em; }
  .scroll-progress { left: var(--space-2); right: var(--space-2); }

  .col-3, .col-4, .col-5, .col-6, .col-7, .col-8 { grid-column: span 12; }
  .entry { grid-template-columns: auto minmax(0, 1fr); }
  .entry-meta { grid-column: 2; }
  .card-grid { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 560px) {
  .header-tools .btn { display: none; }
}

/* ============================================================
   12. 无障碍 / 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;
  }
  .pulse-dot { animation: none; opacity: 1; }
  .bar-fill { transition: none; }
  .scroll-progress-fill { transition: none; }
}