/* ==========================================================================
   飞禽走兽电玩 · 全站共享样式 /assets/site.css
   夜间街机厅 × 收藏册纸张叠层
   ========================================================================== */

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

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

body {
  margin: 0;
  min-height: 100%;
  background-color: var(--ink);
  background-image:
    radial-gradient(circle at 12% -10%, rgba(56, 232, 209, 0.10), transparent 42%),
    radial-gradient(circle at 88% 0%, rgba(255, 138, 61, 0.09), transparent 38%);
  background-repeat: no-repeat;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: clamp(1rem, 0.35vw + 0.95rem, 1.12rem);
  line-height: 1.78;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd { margin: 0; }
ul, ol { margin: 0; }
ul[class], ol[class] { list-style: none; padding: 0; }

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
}

a { color: inherit; }

strong { font-weight: 800; color: var(--paper); }

:focus-visible {
  outline: 2px solid var(--yellow);
  outline-offset: 3px;
  border-radius: 3px;
}

/* ---------- 2. 设计变量 ---------- */
:root {
  color-scheme: dark;

  /* 色彩 */
  --ink: #0B1116;
  --ink-deep: #070B0F;
  --panel: #131D26;
  --panel-soft: #1A2733;
  --paper: #F2E5C9;
  --paper-dim: #E3D3B0;
  --cyan: #38E8D1;
  --orange: #FF8A3D;
  --blue: #5AA7FF;
  --yellow: #F5FF7A;
  --mist: #C8D0D4;
  --brick: #B84E1E;
  --violet: #A77BFF;

  --line: rgba(242, 229, 201, 0.16);
  --line-soft: rgba(242, 229, 201, 0.09);
  --line-strong: rgba(242, 229, 201, 0.36);

  /* 尺度 */
  --shell: 1180px;
  --gutter: clamp(1rem, 4vw, 3rem);
  --gap: clamp(0.85rem, 2vw, 1.5rem);
  --radius-sm: 4px;
  --radius: 12px;
  --radius-lg: 18px;

  /* 字体 */
  --font-display: "Noto Sans SC", "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  /* 效果 */
  --shadow-paper: 0 22px 46px -28px rgba(0, 0, 0, 0.95);
  --shadow-glow: 0 0 18px rgba(56, 232, 209, 0.35);
  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
}

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

.section { padding-block: clamp(2.5rem, 6vw, 5.5rem); }
.section--tight { padding-block: clamp(1.5rem, 3.2vw, 2.75rem); }

.stack {
  display: flex;
  flex-direction: column;
  gap: var(--gap);
}

.stack--tight { gap: 0.55rem; }

/* ---------- 4. 排版 ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -0.015em;
  color: var(--paper);
}

h1 { font-size: clamp(2rem, 5vw, 3.6rem); }
h2 { font-size: clamp(1.55rem, 3vw, 2.35rem); }
h3 { font-size: clamp(1.15rem, 1.8vw, 1.5rem); letter-spacing: 0.01em; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
}

.eyebrow::before {
  content: "";
  width: 1.7rem;
  height: 1px;
  background: currentColor;
}

.prose {
  max-width: 68ch;
  color: var(--mist);
}

.prose > * + * { margin-top: 1.05em; }
.prose h2,
.prose h3 { color: var(--paper); margin-top: 2.1em; }
.prose ul,
.prose ol { padding-left: 1.3em; }
.prose li + li { margin-top: 0.45em; }
.prose a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(56, 232, 209, 0.45);
}
.prose a:hover { border-bottom-color: var(--cyan); }
.prose code,
.prose kbd {
  font-family: var(--font-mono);
  font-size: 0.88em;
  padding: 0.1em 0.4em;
  border-radius: 3px;
  background: var(--panel-soft);
  color: var(--yellow);
}

/* ---------- 5. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.78rem 1.4rem;
  border: 1px solid transparent;
  border-radius: 999px;
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease),
              border-color 0.18s var(--ease), transform 0.18s var(--ease),
              box-shadow 0.18s var(--ease);
}

.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn--primary {
  background: var(--cyan);
  color: #04181A;
  box-shadow: 0 10px 24px -14px rgba(56, 232, 209, 0.9);
}
.btn--primary:hover { background: var(--paper); box-shadow: 0 12px 26px -14px rgba(242, 229, 201, 0.8); }

.btn--warm {
  background: var(--orange);
  color: #1F0C02;
  box-shadow: 0 10px 24px -14px rgba(255, 138, 61, 0.9);
}
.btn--warm:hover { background: var(--yellow); color: #1A1A02; }

.btn--ghost {
  background: transparent;
  border-color: var(--line-strong);
  color: var(--paper);
}
.btn--ghost:hover { border-color: var(--cyan); color: var(--cyan); }

/* ---------- 6. 标签、提示 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.18rem 0.55rem;
  border: 1px solid currentColor;
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  line-height: 1.6;
  color: var(--cyan);
  white-space: nowrap;
}

.tag--warm { color: var(--orange); }
.tag--blue { color: var(--blue); }
.tag--violet { color: var(--violet); }
.tag--solid {
  background: var(--cyan);
  border-color: transparent;
  color: #04181A;
  font-weight: 700;
}

.notice {
  display: flex;
  gap: 0.75rem;
  padding: 0.9rem 1.1rem;
  border-left: 3px solid var(--orange);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: rgba(255, 138, 61, 0.09);
  color: var(--paper);
  font-size: 0.94rem;
  line-height: 1.7;
}

/* ---------- 7. 卡片 ---------- */
.card {
  position: relative;
  padding: clamp(1.05rem, 2.2vw, 1.8rem);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.card:hover { border-color: rgba(56, 232, 209, 0.45); }

.card--paper {
  background: var(--paper);
  border-color: rgba(11, 17, 22, 0.16);
  color: var(--ink);
  box-shadow: var(--shadow-paper);
}
.card--paper h2,
.card--paper h3,
.card--paper strong { color: var(--ink); }
.card--paper .card-kicker { color: var(--brick); }

.card-kicker {
  display: block;
  margin-bottom: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.card-title {
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 1.7vw, 1.35rem);
  font-weight: 900;
  line-height: 1.3;
  color: var(--paper);
}

/* ---------- 8. 图片容器基础规则 ---------- */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  width: 100%;
  aspect-ratio: 16 / 10;
  background: var(--panel-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.media > img,
.media > svg,
.media > picture > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.media--wide { aspect-ratio: 21 / 9; }
.media--square { aspect-ratio: 1 / 1; }
.media--tall { aspect-ratio: 4 / 5; }

.media--paper {
  background:
    repeating-linear-gradient(135deg, rgba(11, 17, 22, 0.05) 0 8px, transparent 8px 16px),
    var(--paper);
  border-color: rgba(11, 17, 22, 0.18);
}

.media__label {
  position: absolute;
  left: 0.65rem;
  bottom: 0.65rem;
  padding: 0.18rem 0.5rem;
  border-radius: 3px;
  background: rgba(7, 11, 15, 0.82);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  pointer-events: none;
}

/* ---------- 9. 网格 ---------- */
.grid {
  display: grid;
  gap: var(--gap);
}

.grid--2 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 21rem), 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 16rem), 1fr)); }

.grid--rail {
  grid-auto-flow: column;
  grid-auto-columns: minmax(16rem, 78vw);
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x proximity;
  padding-bottom: 0.75rem;
  scrollbar-width: thin;
  scrollbar-color: var(--line-strong) transparent;
}
.grid--rail > * { scroll-snap-align: start; }
@media (min-width: 900px) {
  .grid--rail { grid-auto-columns: minmax(19rem, 1fr); grid-auto-flow: column; }
}

/* ---------- 10. 面包屑 ---------- */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  padding: 0;
  margin: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.crumbs li {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

.crumbs li + li::before {
  content: "/";
  color: var(--line-strong);
}

.crumbs a {
  color: var(--cyan);
  text-decoration: none;
}
.crumbs a:hover { text-decoration: underline; }

.crumbs li[aria-current="page"] { color: var(--paper); }

/* ---------- 11. Skip link ---------- */
.skip-link {
  position: absolute;
  top: -4rem;
  left: 50%;
  z-index: 200;
  transform: translateX(-50%);
  padding: 0.7rem 1.3rem;
  background: var(--paper);
  color: var(--ink);
  font-weight: 800;
  font-size: 0.9rem;
  text-decoration: none;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  transition: top 0.18s var(--ease);
}

.skip-link:focus { top: 0; }

/* ==========================================================================
   12. 页头
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: linear-gradient(180deg, rgba(9, 14, 18, 0.98) 0%, rgba(11, 17, 22, 0.94) 100%);
  border-bottom: 1px solid var(--line);
  box-shadow: 0 18px 34px -30px rgba(0, 0, 0, 1);
  color: var(--paper);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.scroll-meter {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  overflow: hidden;
  background: rgba(242, 229, 201, 0.08);
  pointer-events: none;
}

.scroll-meter-fill {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--cyan), var(--blue) 55%, var(--orange));
  will-change: transform;
}

.masthead {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: var(--gap);
  padding-block: clamp(0.6rem, 1.6vw, 1rem);
  transition: padding 0.25s var(--ease);
}

.masthead-note {
  justify-self: start;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  color: var(--mist);
  white-space: nowrap;
}

.masthead-dot {
  display: inline-block;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--yellow);
  box-shadow: 0 0 8px var(--yellow);
}

.brand {
  justify-self: center;
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  text-decoration: none;
  color: var(--paper);
  transition: opacity 0.2s var(--ease);
}

.brand:hover { opacity: 0.88; }

.brand-mark {
  display: grid;
  place-items: center;
  width: 2.75rem;
  height: 2.75rem;
  flex: 0 0 auto;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.02em;
  border-radius: var(--radius-sm);
  box-shadow: 3px 3px 0 var(--orange);
  transition: width 0.25s var(--ease), height 0.25s var(--ease),
              font-size 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  min-width: 0;
}

.brand-name {
  font-family: var(--font-display);
  font-size: clamp(1.05rem, 2.1vw, 1.55rem);
  font-weight: 900;
  letter-spacing: 0.06em;
  line-height: 1.15;
  color: var(--paper);
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.2em;
  color: var(--cyan);
  transition: opacity 0.2s var(--ease);
}

.masthead-actions {
  justify-self: end;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.4rem 0.85rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--paper);
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease),
              background-color 0.18s var(--ease);
}

.chip--live {
  border-color: rgba(56, 232, 209, 0.6);
  color: var(--cyan);
}
.chip--live::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(56, 232, 209, 0.16);
}
.chip--live:hover { background: rgba(56, 232, 209, 0.12); border-color: var(--cyan); }

.chip--calm:hover { border-color: var(--paper); background: var(--paper); color: var(--ink); }

/* 移动端菜单按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  min-width: 2.75rem;
  min-height: 2.75rem;
  padding: 0.45rem 0.6rem;
  background: var(--panel);
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  color: var(--paper);
  cursor: pointer;
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease);
}

.nav-toggle:hover { border-color: var(--cyan); color: var(--cyan); }

.nav-toggle-box {
  display: grid;
  gap: 3px;
  width: 1.15rem;
}

.nav-toggle-box span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform 0.22s var(--ease), opacity 0.18s var(--ease);
}

.site-header[data-open] .nav-toggle { border-color: var(--cyan); color: var(--cyan); }
.site-header[data-open] .nav-toggle-box span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.site-header[data-open] .nav-toggle-box span:nth-child(2) { opacity: 0; }
.site-header[data-open] .nav-toggle-box span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

/* 主导航 */
.primary-nav {
  border-top: 1px solid var(--line-soft);
}

.nav-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: clamp(0.25rem, 2.2vw, 1.5rem);
  padding: 0;
}

.nav-item { display: block; }

.nav-link {
  position: relative;
  display: block;
  padding: 0.68rem 0.35rem 0.78rem;
  font-family: var(--font-display);
  font-size: clamp(0.88rem, 1.15vw, 1rem);
  font-weight: 700;
  letter-spacing: 0.07em;
  color: var(--mist);
  text-decoration: none;
  transition: color 0.18s var(--ease);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0.4rem;
  width: 0;
  height: 2px;
  transform: translateX(-50%);
  background: var(--cyan);
  border-radius: 2px;
  transition: width 0.22s var(--ease);
}

.nav-link:hover { color: var(--paper); }
.nav-link:hover::after { width: 62%; }

.nav-link[aria-current="page"] { color: var(--paper); }
.nav-link[aria-current="page"]::after {
  width: 100%;
  box-shadow: 0 0 10px rgba(56, 232, 209, 0.8);
}

/* 横向入口带 */
.entry-strip {
  border-top: 1px solid var(--line-soft);
  background:
    repeating-linear-gradient(90deg, rgba(242, 229, 201, 0.05) 0 1px, transparent 1px 22px),
    linear-gradient(90deg, rgba(19, 29, 38, 0.95), rgba(11, 17, 22, 0.9));
}

.entry-track {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding-block: 0.32rem;
  overflow-x: auto;
  scrollbar-width: none;
}
.entry-track::-webkit-scrollbar { display: none; }

.entry-track a {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--mist);
  text-decoration: none;
  white-space: nowrap;
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease);
}

.entry-track a:hover { background: var(--paper); color: var(--ink); }

.entry-index {
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.entry-track a:hover .entry-index { color: var(--brick); }

/* 滚动收窄 */
.site-header[data-compact] .masthead { padding-block: 0.3rem; }
.site-header[data-compact] .brand-mark {
  width: 2.2rem;
  height: 2.2rem;
  font-size: 1.05rem;
  box-shadow: 2px 2px 0 var(--orange);
}
.site-header[data-compact] .brand-sub { opacity: 0.55; }

/* ==========================================================================
   13. 页脚
   ========================================================================== */
.site-footer {
  margin-top: clamp(3rem, 8vw, 6rem);
  background: var(--ink-deep);
  color: var(--mist);
  border-top: 1px solid var(--line);
}

.site-footer::before {
  content: "";
  display: block;
  height: 6px;
  background: repeating-linear-gradient(
    90deg,
    var(--cyan) 0 18px,
    transparent 18px 30px,
    var(--orange) 30px 48px,
    transparent 48px 60px
  );
  opacity: 0.55;
}

.footer-shell {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 14rem), 1fr));
  gap: clamp(1.6rem, 3vw, 2.75rem);
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding: clamp(2.2rem, 5vw, 3.4rem) var(--gutter) clamp(1.4rem, 3vw, 2rem);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.85rem;
}

.brand--footer {
  justify-self: start;
  gap: 0.6rem;
}

.brand--footer .brand-name { font-size: 1.12rem; letter-spacing: 0.08em; }
.brand--footer .brand-sub { color: var(--orange); }

.footer-motto {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.6;
  color: var(--paper);
  max-width: 18ch;
}

.stamp {
  display: inline-block;
  padding: 0.28rem 0.7rem;
  border: 1px dashed var(--line-strong);
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.footer-title {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--cyan);
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  padding: 0;
  margin: 0;
  list-style: none;
  font-size: 0.94rem;
}

.footer-list a {
  color: var(--mist);
  text-decoration: none;
  transition: color 0.18s var(--ease), padding-left 0.18s var(--ease);
}

.footer-list a:hover {
  color: var(--paper);
  padding-left: 0.25rem;
  text-decoration: underline;
  text-decoration-color: var(--orange);
  text-underline-offset: 4px;
}

.footer-list--plain { gap: 0.6rem; }

.footer-list--plain li {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.footer-key {
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.footer-value {
  color: var(--paper);
  font-size: 0.92rem;
  word-break: break-word;
}

.footer-note {
  font-size: 0.82rem;
  line-height: 1.7;
  color: rgba(200, 208, 212, 0.72);
  max-width: 26ch;
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding-block: 1.1rem 1.5rem;
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: rgba(200, 208, 212, 0.65);
}

.footer-base-mark { color: rgba(200, 208, 212, 0.45); }

/* ==========================================================================
   14. 滚动显现
   ========================================================================== */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.55s var(--ease), transform 0.55s var(--ease);
}

html.js [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

/* ==========================================================================
   15. 响应式
   ========================================================================== */
@media (max-width: 1080px) {
  .masthead-note { font-size: 0.62rem; letter-spacing: 0.14em; }
  .chip--calm { display: none; }
}

@media (max-width: 860px) {
  .masthead {
    grid-template-columns: auto 1fr;
    gap: 0.5rem;
    padding-block: 0.55rem;
  }

  .masthead-note { display: none; }

  .brand { justify-self: start; }
  .brand-name { font-size: 1.12rem; letter-spacing: 0.05em; }
  .brand-sub { font-size: 0.58rem; letter-spacing: 0.16em; }

  .masthead-actions {
    justify-self: end;
    gap: 0.4rem;
  }

  .masthead-actions .chip { display: none; }

  .nav-toggle { display: inline-flex; }

  .primary-nav {
    display: none;
    border-top: 1px solid var(--line);
    background: linear-gradient(180deg, var(--panel) 0%, var(--ink) 100%);
    max-height: min(72vh, 32rem);
    overflow-y: auto;
    overscroll-behavior: contain;
  }

  .site-header[data-open] .primary-nav { display: block; }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding-block: 0.35rem 0.7rem;
  }

  .nav-item { border-bottom: 1px dashed var(--line-soft); }
  .nav-item:last-child { border-bottom: 0; }

  .nav-link {
    padding: 0.82rem 0.25rem 0.82rem 1.15rem;
    font-size: 1rem;
    letter-spacing: 0.05em;
  }

  .nav-link::after { display: none; }

  .nav-link[aria-current="page"] {
    color: var(--cyan);
    background: linear-gradient(90deg, rgba(56, 232, 209, 0.16), rgba(56, 232, 209, 0) 72%);
  }

  .nav-link[aria-current="page"]::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 3px;
    height: 1.05rem;
    transform: translateY(-50%);
    background: var(--cyan);
    border-radius: 2px;
    box-shadow: 0 0 8px var(--cyan);
  }

  .entry-track a { font-size: 0.74rem; padding: 0.3rem 0.6rem; }

  .footer-base { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 520px) {
  .brand-mark {
    width: 2.35rem;
    height: 2.35rem;
    font-size: 1.15rem;
    box-shadow: 2px 2px 0 var(--orange);
  }

  .brand-name { font-size: 1rem; }
  .brand-sub { display: none; }

  .footer-motto { max-width: none; }
}

/* ==========================================================================
   16. 动效偏好与强制色彩可读
   ========================================================================== */
@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;
    scroll-behavior: auto !important;
  }

  html.js [data-reveal] {
    opacity: 1;
    transform: none;
  }

  .btn:hover,
  .card:hover { transform: none; }
}

@media (forced-colors: active) {
  .scroll-meter { display: none; }
  .site-header,
  .site-footer { border-color: CanvasText; }
}