/* ============================================================
   革命 · Revolution — 左翼红色风格 · Material Design 3
   色板由 Google material-color-utilities（SchemeTonalSpot,
   seed #B3261E）生成；组件规格遵循 m3.material.io
   ============================================================ */

/* ---------- 1. 设计 Tokens ---------- */
:root {
  /* 形状（M3 shape scale） */
  --md-shape-xs: 4px;    /* corner-extra-small */
  --md-shape-s: 8px;     /* corner-small */
  --md-shape-m: 12px;    /* corner-medium */
  --md-shape-l: 16px;    /* corner-large */
  --md-shape-xl: 28px;   /* corner-extra-large */
  --md-shape-full: 999px;

  /* 排版（M3 type scale） */
  --md-font: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --md-font-mono: "JetBrains Mono", "Fira Code", "SFMono-Regular", Consolas, "Liberation Mono", monospace;

  --md-typescale-display-large: 57px / 64px 400;
  --md-typescale-display-medium: 45px / 52px 400;
  --md-typescale-display-small: 36px / 44px 400;
  --md-typescale-headline-large: 32px / 40px 400;
  --md-typescale-headline-medium: 28px / 36px 400;
  --md-typescale-headline-small: 24px / 32px 400;
  --md-typescale-title-large: 22px / 28px 400;
  --md-typescale-title-medium: 16px / 24px 500;
  --md-typescale-title-small: 14px / 20px 500;
  --md-typescale-body-large: 16px / 24px 400;
  --md-typescale-body-medium: 14px / 20px 400;
  --md-typescale-body-small: 12px / 16px 400;
  --md-typescale-label-large: 14px / 20px 500;
  --md-typescale-label-medium: 12px / 16px 500;
  --md-typescale-label-small: 11px / 16px 500;

  /* 状态层（M3 state layers） */
  --md-state-hover: 0.08;
  --md-state-focus: 0.12;
  --md-state-pressed: 0.10;
  --md-state-dragged: 0.16;

  /* 层级（M3 elevation） */
  --md-elevation-1: 0 1px 2px rgba(0, 0, 0, 0.3), 0 1px 3px 1px rgba(0, 0, 0, 0.15);
  --md-elevation-2: 0 1px 2px rgba(0, 0, 0, 0.3), 0 2px 6px 2px rgba(0, 0, 0, 0.15);
  --md-elevation-3: 0 1px 3px rgba(0, 0, 0, 0.3), 0 4px 8px 3px rgba(0, 0, 0, 0.15);

  /* 动效（M3 motion easing） */
  --md-motion-emphasized: cubic-bezier(0.2, 0, 0, 1);
  --md-motion-standard: cubic-bezier(0.2, 0, 0, 1);
  --md-motion-emphasized-decelerate: cubic-bezier(0.05, 0.7, 0.1, 1);
  --md-motion-emphasized-accelerate: cubic-bezier(0.3, 0, 0.8, 0.15);
  --md-transition: 0.2s var(--md-motion-emphasized);

  /* 品牌红（革命红渐变，用于品牌区域） */
  --md-brand-gradient: linear-gradient(120deg, #7A0007 0%, #B3261E 60%, #C4453C 100%);
  --md-brand-gradient-soft: linear-gradient(135deg, #6E0005 0%, #B3261E 55%, #C4453C 100%);
}

/* 亮色（M3 tonal palette · seed #B3261E · material-color-utilities） */
:root[data-theme="light"] {
  --md-primary: #904a42;
  --md-on-primary: #ffffff;
  --md-primary-container: #ffdad5;
  --md-on-primary-container: #73342c;
  --md-secondary: #775652;
  --md-on-secondary: #ffffff;
  --md-secondary-container: #ffdad5;
  --md-on-secondary-container: #5d3f3b;
  --md-tertiary: #705c2e;
  --md-on-tertiary: #ffffff;
  --md-tertiary-container: #fcdfa6;
  --md-on-tertiary-container: #574419;
  --md-error: #ba1a1a;
  --md-on-error: #ffffff;
  --md-error-container: #ffdad6;
  --md-on-error-container: #93000a;
  --md-background: #fff8f7;
  --md-on-background: #231918;
  --md-surface: #fff8f7;
  --md-on-surface: #231918;
  --md-surface-variant: #f5ddda;
  --md-on-surface-variant: #534341;
  --md-outline: #857370;
  --md-outline-variant: #d8c2be;
  --md-shadow: #000000;
  --md-scrim: #000000;
  --md-inverse-surface: #392e2c;
  --md-inverse-on-surface: #ffedea;
  --md-inverse-primary: #ffb4aa;
  --md-surface-container-lowest: #ffffff;
  --md-surface-container-low: #fff0ee;
  --md-surface-container: #fceae7;
  --md-surface-container-high: #f7e4e1;
  --md-surface-container-highest: #f1dedc;
  --md-surface-bright: #fff8f7;
  --md-surface-dim: #e8d6d3;
  --md-primary-fixed: #ffdad5;
  --md-primary-fixed-dim: #ffb4aa;
  --md-on-primary-fixed: #3b0906;
  --md-on-primary-fixed-variant: #73342c;
  --md-secondary-fixed: #ffdad5;
  --md-secondary-fixed-dim: #e7bdb7;
  --md-on-secondary-fixed: #2c1512;
  --md-on-secondary-fixed-variant: #5d3f3b;
  --md-tertiary-fixed: #fcdfa6;
  --md-tertiary-fixed-dim: #dfc38c;
  --md-on-tertiary-fixed: #261a00;
  --md-on-tertiary-fixed-variant: #574419;

  /* 品牌叠加 */
  --md-brand-scrim: rgba(0, 0, 0, 0.32);
}

/* 暗色 */
:root[data-theme="dark"] {
  --md-primary: #ffb4aa;
  --md-on-primary: #561e18;
  --md-primary-container: #73342c;
  --md-on-primary-container: #ffdad5;
  --md-secondary: #e7bdb7;
  --md-on-secondary: #442926;
  --md-secondary-container: #5d3f3b;
  --md-on-secondary-container: #ffdad5;
  --md-tertiary: #dfc38c;
  --md-on-tertiary: #3e2e04;
  --md-tertiary-container: #574419;
  --md-on-tertiary-container: #fcdfa6;
  --md-error: #ffb4ab;
  --md-on-error: #690005;
  --md-error-container: #93000a;
  --md-on-error-container: #ffdad6;
  --md-background: #1a1110;
  --md-on-background: #f1dedc;
  --md-surface: #1a1110;
  --md-on-surface: #f1dedc;
  --md-surface-variant: #534341;
  --md-on-surface-variant: #d8c2be;
  --md-outline: #a08c89;
  --md-outline-variant: #534341;
  --md-shadow: #000000;
  --md-scrim: #000000;
  --md-inverse-surface: #f1dedc;
  --md-inverse-on-surface: #392e2c;
  --md-inverse-primary: #904a42;
  --md-surface-container-lowest: #140c0b;
  --md-surface-container-low: #231918;
  --md-surface-container: #271d1c;
  --md-surface-container-high: #322826;
  --md-surface-container-highest: #3d3231;
  --md-surface-bright: #423735;
  --md-surface-dim: #1a1110;
  --md-primary-fixed: #ffdad5;
  --md-primary-fixed-dim: #ffb4aa;
  --md-on-primary-fixed: #3b0906;
  --md-on-primary-fixed-variant: #73342c;
  --md-secondary-fixed: #ffdad5;
  --md-secondary-fixed-dim: #e7bdb7;
  --md-on-secondary-fixed: #2c1512;
  --md-on-secondary-fixed-variant: #5d3f3b;
  --md-tertiary-fixed: #fcdfa6;
  --md-tertiary-fixed-dim: #dfc38c;
  --md-on-tertiary-fixed: #261a00;
  --md-on-tertiary-fixed-variant: #574419;

  --md-brand-scrim: rgba(0, 0, 0, 0.5);
}

/* ---------- 2. 基础 ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  font-family: var(--md-font);
  font-size: 16px;
  line-height: 1.7;
  background: var(--md-background);
  color: var(--md-on-background);
  transition: background var(--md-transition), color var(--md-transition);
}

a {
  color: var(--md-primary);
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover {
  color: var(--md-on-primary-container);
}

img {
  max-width: 100%;
  height: auto;
}

svg {
  width: 1.1em;
  height: 1.1em;
  flex: none;
}

.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 20px;
}

.app-content {
  min-height: calc(100vh - 64px - 180px);
  padding: 0 0 48px;
}

/* 主题切换图标 */
.icon-moon { display: none; }
:root[data-theme="dark"] .icon-sun { display: none; }
:root[data-theme="dark"] .icon-moon { display: block; }

/* ---------- 3. 顶部应用栏（M3 Small App Bar） ---------- */
/* M3：滚动时不用投影分离，而是颜色填充；滚动后加深并加底边 */
.top-app-bar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--md-brand-gradient);
  color: #ffffff;
  transition: background 0.3s var(--md-motion-emphasized), box-shadow 0.3s var(--md-motion-emphasized);
}

.top-app-bar.scrolled {
  background: linear-gradient(120deg, #5E0005 0%, #96221D 60%, #A8322C 100%);
  box-shadow: none;
  border-bottom: 1px solid rgba(255, 255, 255, 0.18);
}

.app-bar-inner {
  display: flex;
  align-items: center;
  gap: 8px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 12px;
  height: 64px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: inherit;
  margin-right: auto;
  min-width: 0;
}

.brand:hover { color: inherit; }

.brand-logo {
  width: 32px;
  height: 32px;
  -webkit-mask: url("../images/wiki.svg") center / contain no-repeat;
  mask: url("../images/wiki.svg") center / contain no-repeat;
  background: currentColor;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
  min-width: 0;
}

.brand-name {
  font-size: 22px; /* title-large */
  font-weight: 500;
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.brand-suffix {
  font-size: 11px; /* label-medium */
  font-weight: 500;
  opacity: 0.88;
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.app-bar-nav {
  display: none;
  align-items: center;
  gap: 4px;
}

.nav-item {
  display: block;
  padding: 8px 16px;
  border-radius: var(--md-shape-full);
  color: inherit;
  font-size: 14px; /* label-large */
  font-weight: 500;
  letter-spacing: 0.01em;
  position: relative;
  transition: background 0.15s var(--md-motion-standard);
}

/* 状态层 */
.nav-item:hover {
  color: inherit;
  background: rgba(255, 255, 255, var(--md-state-hover));
}

.nav-item:active {
  background: rgba(255, 255, 255, var(--md-state-pressed));
}

.nav-item:focus-visible {
  background: rgba(255, 255, 255, var(--md-state-focus));
}

.nav-item.active {
  color: #7A0007;
  background: #ffffff;
  box-shadow: var(--md-elevation-1);
}

.icon-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px; /* M3 触控目标 ≥ 48dp */
  height: 48px;
  padding: 0;
  border: none;
  border-radius: var(--md-shape-full);
  background: transparent;
  color: inherit;
  cursor: pointer;
  transition: background 0.15s var(--md-motion-standard), transform 0.1s ease;
}

.icon-button:hover { background: rgba(255, 255, 255, var(--md-state-hover)); }
.icon-button:active { background: rgba(255, 255, 255, var(--md-state-pressed)); transform: scale(0.94); }

#menu-toggle { display: none; }

/* 阅读进度条 */
.app-bar-progress {
  height: 3px;
  background: rgba(255, 255, 255, 0.22);
}

.app-bar-progress-fill {
  height: 100%;
  width: 0;
  background: var(--md-tertiary-fixed, #fcdfa6);
  transition: width 0.1s linear;
}

/* ---------- 4. 导航抽屉（M3 Modal Navigation Drawer） ---------- */
.scrim {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: var(--md-brand-scrim);
  opacity: 0;
  transition: opacity 0.25s var(--md-motion-standard);
}

.scrim.show { opacity: 1; }

.nav-drawer {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  z-index: 210;
  width: min(360px, 85vw); /* M3 modal drawer 宽 360dp */
  display: flex;
  flex-direction: column;
  background: var(--md-surface-container-low);
  color: var(--md-on-surface);
  border-radius: 0 var(--md-shape-l) var(--md-shape-l) 0; /* M3 圆角 16dp */
  box-shadow: var(--md-elevation-3);
  transform: translateX(-105%);
  transition: transform 0.28s var(--md-motion-emphasized);
  overflow-y: auto;
}

.nav-drawer.open { transform: translateX(0); }

.nav-drawer-header {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 28px 28px 16px; /* M3 header 上边距 28dp */
  color: var(--md-on-surface);
}

.nav-drawer-header .brand-logo {
  width: 40px;
  height: 40px;
  background: var(--md-primary);
  -webkit-mask: url("../images/wiki.svg") center / contain no-repeat;
  mask: url("../images/wiki.svg") center / contain no-repeat;
}

.nav-drawer-header .brand-name { font-size: 22px; color: var(--md-on-surface); }

.nav-drawer-list {
  display: flex;
  flex-direction: column;
  padding: 12px;
  gap: 2px;
}

/* M3 nav item：高 56dp，active 用 secondary-container */
.nav-drawer-item {
  display: flex;
  align-items: center;
  gap: 16px;
  min-height: 56px;
  padding: 0 20px;
  border-radius: var(--md-shape-full);
  color: var(--md-on-surface);
  font-size: 14px; /* label-large */
  font-weight: 500;
  transition: background 0.15s var(--md-motion-standard);
}

.nav-drawer-item:hover {
  color: var(--md-on-surface);
  background: color-mix(in srgb, var(--md-on-surface) var(--md-state-hover), transparent);
}

.nav-drawer-item:active {
  background: color-mix(in srgb, var(--md-on-surface) var(--md-state-pressed), transparent);
}

.nav-drawer-item.active {
  color: var(--md-on-secondary-container);
  background: var(--md-secondary-container);
  font-weight: 600;
}

.nav-drawer-icon {
  display: inline-flex;
  width: 24px;
  height: 24px;
  align-items: center;
  justify-content: center;
  color: var(--md-on-surface-variant);
}

.nav-drawer-item.active .nav-drawer-icon { color: var(--md-on-secondary-container); }

.nav-drawer-footer {
  margin-top: auto;
  padding: 16px 28px 24px;
  display: flex;
  gap: 16px;
  border-top: 1px solid var(--md-outline-variant);
  font-size: 13px;
}

.nav-drawer-footer .social-link { color: var(--md-on-surface-variant); }
.nav-drawer-footer .social-link:hover { color: var(--md-primary); }

/* ---------- 5. 服务状态横幅 ---------- */
.status-banner {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px 14px;
  margin: 24px 0 0;
  padding: 12px 18px;
  border-radius: var(--md-shape-m);
  background: color-mix(in srgb, var(--status-color) 9%, var(--md-surface-container-low));
  border: 1px solid color-mix(in srgb, var(--status-color) 32%, transparent);
  color: var(--md-on-surface);
}

.status-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--status-color);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--status-color) 22%, transparent);
  flex: none;
}

.status-text {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 4px 12px;
  min-width: 0;
}

.status-title {
  font-size: 14px; /* label-large */
  font-weight: 600;
  letter-spacing: 0.01em;
}

.status-message {
  font-size: 13.5px;
  color: var(--md-on-surface-variant);
}

.status-updated {
  margin-left: auto;
  font-size: 12px;
  color: var(--md-on-surface-variant);
  opacity: 0.8;
  white-space: nowrap;
}

.level-operational { --status-color: #2E9E5B; }
.level-maintenance { --status-color: #F0A500; }
.level-degraded   { --status-color: #E8590C; }
.level-down       { --status-color: var(--md-error); }

/* 非正常运行状态，圆点脉冲提示 */
.level-maintenance .status-dot,
.level-degraded .status-dot,
.level-down .status-dot {
  animation: status-pulse 1.8s ease-in-out infinite;
}

@keyframes status-pulse {
  0%, 100% { box-shadow: 0 0 0 4px color-mix(in srgb, var(--status-color) 22%, transparent); }
  50% { box-shadow: 0 0 0 8px color-mix(in srgb, var(--status-color) 10%, transparent); }
}

/* ---------- 6. 首页 Hero（品牌区） ---------- */
.hero {
  position: relative;
  overflow: hidden;
  border-radius: var(--md-shape-xl);
  background: var(--md-brand-gradient-soft);
  color: #ffffff;
  padding: 56px 44px;
  margin: 28px 0 36px;
  box-shadow: var(--md-elevation-2);
}

.hero-content { position: relative; z-index: 1; }

.hero-title {
  margin: 0 0 8px;
  font-size: clamp(28px, 5vw, 40px); /* headline-large ~ display-small */
  font-weight: 700;
  letter-spacing: 0.01em;
}

.hero-subtitle {
  margin: 0 0 12px;
  font-size: clamp(15px, 2.5vw, 18px);
  opacity: 0.92;
}

.hero-slogan {
  margin: 0;
  font-size: 14px;
  opacity: 0.85;
  letter-spacing: 0.04em;
}

.hero-star {
  position: absolute;
  right: -30px;
  top: 50%;
  transform: translateY(-50%);
  width: 260px;
  height: 260px;
  fill: rgba(255, 255, 255, 0.09);
  animation: hero-star-spin 60s linear infinite;
}

@keyframes hero-star-spin {
  from { transform: translateY(-50%) rotate(0deg); }
  to { transform: translateY(-50%) rotate(360deg); }
}

/* ---------- 6. 卡片（M3 Outlined Card） ---------- */
.card {
  background: var(--md-surface-container-lowest);
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--md-shape-m); /* 12dp */
  box-shadow: none;
  transition: box-shadow var(--md-transition), transform var(--md-transition), border-color var(--md-transition);
}

.card:hover {
  box-shadow: var(--md-elevation-1);
  border-color: var(--md-outline);
}

.post-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.post-card { overflow: hidden; }

.card-content { padding: 24px 28px; }

.post-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 16px;
  font-size: 13px;
  color: var(--md-on-surface-variant);
}

.meta-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.meta-link { color: var(--md-on-surface-variant); }
.meta-link:hover { color: var(--md-primary); }

.card-title {
  margin: 12px 0 10px;
  font-size: 22px; /* title-large */
  font-weight: 500;
  line-height: 1.45;
}

.card-title a { color: var(--md-on-surface); }
.card-title a:hover { color: var(--md-primary); }

.card-excerpt {
  color: var(--md-on-surface-variant);
  font-size: 15px;
  line-height: 1.75;
}

.card-excerpt p { margin: 0 0 10px; }
.card-excerpt p:last-child { margin-bottom: 0; }

.card-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 16px;
  flex-wrap: wrap;
}

/* ---------- 7. 按钮（M3 Text Button） ---------- */
.button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 40px; /* M3 按钮高 40dp */
  padding: 0 16px;
  border-radius: var(--md-shape-full); /* corner-full */
  font-size: 14px; /* label-large */
  font-weight: 500;
  letter-spacing: 0.02em;
  transition: background 0.15s var(--md-motion-standard);
}

.button-text {
  color: var(--md-primary);
}

.button-text:hover {
  color: var(--md-primary);
  background: var(--md-primary-container);
}

.button-text:active {
  background: color-mix(in srgb, var(--md-primary) var(--md-state-pressed), transparent);
}

/* ---------- 8. Chips（M3 Assist/Filter Chip） ---------- */
.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 32px; /* M3 chip 高 32dp */
  padding: 0 14px;
  border: 1px solid var(--md-outline);
  border-radius: var(--md-shape-s); /* 8dp */
  background: transparent;
  color: var(--md-on-surface-variant);
  font-size: 13px; /* label-large */
  font-weight: 500;
  line-height: 1.5;
  transition: all 0.15s var(--md-motion-standard);
}

.chip:hover {
  color: var(--md-on-surface);
  background: var(--md-surface-container-low);
  border-color: var(--md-outline);
}

.chip:active {
  background: color-mix(in srgb, var(--md-on-surface) var(--md-state-pressed), transparent);
}

/* ---------- 9. 分页 ---------- */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin: 40px 0 8px;
}

.pagination-button {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 40px;
  padding: 0 18px;
  border-radius: var(--md-shape-full);
  background: var(--md-surface-container-high);
  color: var(--md-on-surface);
  font-size: 14px;
  font-weight: 500;
  transition: background 0.15s var(--md-motion-standard);
}

.pagination-button:hover {
  color: var(--md-on-primary-container);
  background: var(--md-primary-container);
}

.pagination-button.disabled {
  opacity: 0.4;
  pointer-events: none;
}

.pagination-info {
  font-size: 13px;
  color: var(--md-on-surface-variant);
  letter-spacing: 0.04em;
}

/* ---------- 10. FAB（M3 Regular FAB） ---------- */
.fab {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 150;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;  /* M3 FAB 56dp */
  height: 56px;
  border: none;
  border-radius: var(--md-shape-l); /* 16dp */
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
  box-shadow: var(--md-elevation-3);
  cursor: pointer;
  transition: transform 0.2s var(--md-motion-emphasized), box-shadow 0.2s var(--md-motion-emphasized);
}

.fab svg { width: 24px; height: 24px; }

.fab:hover { transform: translateY(-2px); box-shadow: var(--md-elevation-3), 0 6px 16px rgba(0, 0, 0, 0.3); }
.fab:active { transform: scale(0.94); }
.fab[hidden] { display: none; }

/* ---------- 11. 页面标题 ---------- */
.page-heading {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 36px 0 28px;
  font-size: 30px; /* headline-medium */
  font-weight: 400;
  color: var(--md-on-background);
}

.page-heading svg {
  width: 30px;
  height: 30px;
  color: var(--md-primary);
}

/* ---------- 12. 文章页 ---------- */
.post-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  margin-top: 28px;
}

.post-article { padding: 32px 36px; }

/* 独立页面（如“关于本站”）卡片与顶部应用栏之间留出间距 */
.page-article { margin-top: 28px; }

.post-header {
  margin-bottom: 28px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--md-outline-variant);
}

.post-title {
  margin: 0 0 16px;
  font-size: clamp(26px, 4vw, 34px); /* headline-medium ~ large */
  font-weight: 700;
  line-height: 1.35;
  color: var(--md-on-background);
}

.post-content {
  font-size: 16px; /* body-large */
  line-height: 1.85;
  color: var(--md-on-background);
  word-wrap: break-word;
  max-width: 860px; /* 无 TOC 页面防止正文过宽 */
}

.post-content h2 {
  font-size: 24px; /* headline-small */
  font-weight: 500;
  margin: 40px 0 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--md-outline-variant);
  color: var(--md-on-background);
}

.post-content h3 {
  font-size: 20px; /* title-large */
  font-weight: 500;
  margin: 32px 0 12px;
  color: var(--md-on-background);
}

.post-content h4 {
  font-size: 17px;
  font-weight: 500;
  margin: 26px 0 10px;
  color: var(--md-on-background);
}

.post-content p { margin: 14px 0; }

.post-content a {
  text-decoration: underline;
  text-decoration-color: var(--md-outline);
  text-underline-offset: 3px;
}

.post-content a:hover { text-decoration-color: currentColor; }

.post-content ul,
.post-content ol {
  padding-left: 26px;
  margin: 14px 0;
}

.post-content li { margin: 6px 0; }

.post-content blockquote {
  margin: 20px 0;
  padding: 14px 20px;
  border-left: 4px solid var(--md-primary);
  background: var(--md-surface-container-low);
  border-radius: 0 var(--md-shape-m) var(--md-shape-m) 0;
  color: var(--md-on-surface-variant);
}

.post-content blockquote p { margin: 6px 0; }

.post-content img {
  border-radius: var(--md-shape-m);
  box-shadow: var(--md-elevation-1);
}

.post-content hr {
  border: none;
  height: 1px;
  background: var(--md-outline-variant);
  margin: 28px 0;
}

.post-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 18px 0;
  font-size: 14px;
}

.post-content th,
.post-content td {
  border: 1px solid var(--md-outline-variant);
  padding: 10px 14px;
  text-align: left;
}

.post-content th {
  background: var(--md-surface-container);
  font-weight: 600;
}

.post-content code {
  font-family: var(--md-font-mono);
  font-size: 0.88em;
  background: var(--md-surface-container-high);
  padding: 2px 7px;
  border-radius: var(--md-shape-xs);
  color: var(--md-primary);
}

.post-content pre {
  background: var(--md-surface-container-highest);
  color: var(--md-on-surface);
  border-radius: var(--md-shape-m);
  padding: 18px 20px;
  overflow-x: auto;
  font-size: 13.5px;
  line-height: 1.65;
}

.post-content pre code {
  background: none;
  color: inherit;
  padding: 0;
  font-size: inherit;
}

.post-tags {
  margin-top: 32px;
  padding-top: 20px;
  border-top: 1px solid var(--md-outline-variant);
}

/* 上一篇 / 下一篇 */
.post-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--md-outline-variant);
}

.post-nav-link {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 20px;
  border-radius: var(--md-shape-m);
  background: var(--md-surface-container-low);
  border: 1px solid var(--md-outline-variant);
  transition: all 0.15s var(--md-motion-standard);
}

.post-nav-link:hover {
  border-color: var(--md-primary);
  background: var(--md-primary-container);
}

.post-nav-link.next { text-align: right; align-items: flex-end; }

.post-nav-label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--md-on-surface-variant);
}

.post-nav-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--md-on-surface);
  line-height: 1.4;
}

/* 目录（TOC） */
.toc-column { display: none; }

.toc {
  position: sticky;
  top: 88px;
  max-height: calc(100vh - 110px);
  overflow-y: auto;
  padding: 4px 0 4px 14px;
  border-left: 2px solid var(--md-outline-variant);
}

.toc-title {
  font-size: 12px; /* label-medium */
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--md-on-surface-variant);
  margin: 0 0 8px;
}

.toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 13.5px;
}

.toc-list li { margin: 2px 0; }

.toc-list a {
  display: block;
  padding: 4px 10px 4px 12px;
  border-radius: var(--md-shape-s);
  color: var(--md-on-surface-variant);
  line-height: 1.45;
  border-left: 3px solid transparent;
}

.toc-list a:hover {
  color: var(--md-primary);
  background: var(--md-surface-container-low);
}

.toc-list a.active {
  color: var(--md-on-primary-container);
  background: var(--md-primary-container);
  border-left-color: var(--md-primary);
  font-weight: 600;
}

.toc-list .toc-h3 { padding-left: 34px; }
.toc-list .toc-h4 { padding-left: 50px; }

/* ---------- 13. 归档 ---------- */
.archive-list { display: flex; flex-direction: column; gap: 28px; }

.archive-year-title {
  font-size: 22px; /* title-large */
  font-weight: 500;
  color: var(--md-primary);
  margin: 0 0 14px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.archive-year-title::after {
  content: "";
  flex: 1;
  height: 2px;
  background: var(--md-outline-variant);
  border-radius: 2px;
}

.archive-items {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.archive-item {
  display: flex;
  align-items: baseline;
  gap: 18px;
  padding: 10px 16px;
  border-radius: var(--md-shape-s);
  transition: background 0.15s var(--md-motion-standard);
}

.archive-item:hover { background: var(--md-surface-container-low); }

.archive-item-date {
  flex: none;
  font-size: 13px;
  color: var(--md-on-surface-variant);
  font-variant-numeric: tabular-nums;
}

.archive-item-title {
  font-size: 15.5px;
  font-weight: 500;
  color: var(--md-on-surface);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.archive-item-title:hover { color: var(--md-primary); }

/* ---------- 14. 标签云 ---------- */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  padding: 8px 0 24px;
}

.tag-chip {
  padding: 0 16px;
  transition: background 0.2s var(--md-motion-standard),
              border-color 0.2s var(--md-motion-standard),
              color 0.2s var(--md-motion-standard),
              transform 0.2s var(--md-motion-emphasized),
              box-shadow 0.2s var(--md-motion-emphasized);
}

.tag-chip:hover {
  transform: translateY(-2px);
  box-shadow: var(--md-elevation-1);
}

.tag-count {
  font-size: 0.78em;
  opacity: 0.75;
  background: var(--md-surface-container-high);
  border-radius: var(--md-shape-full);
  padding: 1px 8px;
  transition: background 0.2s var(--md-motion-standard), color 0.2s var(--md-motion-standard), opacity 0.2s var(--md-motion-standard);
}

.tag-chip:hover .tag-count { background: var(--md-on-primary-container); color: var(--md-primary-container); }

/* ---------- 15. 分类 ---------- */
.category-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
  padding-bottom: 24px;
}

.category-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 20px 22px;
  color: var(--md-on-surface);
}

.category-card:hover { color: var(--md-on-surface); }

.category-card-icon {
  display: inline-flex;
  width: 42px;
  height: 42px;
  align-items: center;
  justify-content: center;
  border-radius: var(--md-shape-m);
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
  font-size: 22px;
}

.category-card-name {
  font-size: 16px;
  font-weight: 600;
}

.category-card-count {
  margin-left: auto;
  font-size: 12.5px;
  color: var(--md-on-surface-variant);
}

/* ---------- 16. 页脚 ---------- */
.app-footer {
  background: var(--md-surface-container);
  color: var(--md-on-surface-variant);
  border-top: 1px solid var(--md-outline-variant);
  margin-top: 40px;
}

.footer-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 32px 20px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-slogan {
  margin: 0;
  font-size: 15px;
  font-weight: 600;
  color: var(--md-primary);
  letter-spacing: 0.03em;
}

.footer-copyright {
  margin: 0;
  font-size: 13px;
}

.footer-copyright a { color: var(--md-on-surface-variant); }
.footer-copyright a:hover { color: var(--md-primary); }

.footer-links {
  margin: 0;
  display: flex;
  justify-content: center;
  gap: 18px;
  font-size: 13px;
}

.footer-links a { color: var(--md-on-surface-variant); }
.footer-links a:hover { color: var(--md-primary); }

/* ---------- 17. 代码高亮（M3 surface 上的红色系配色） ---------- */
.highlight {
  background: var(--md-surface-container-highest);
  border-radius: var(--md-shape-m);
  margin: 18px 0;
  overflow: hidden;
  border: 1px solid var(--md-outline-variant);
}

.highlight table {
  width: 100%;
  margin: 0;
  border: none;
}

.highlight .gutter {
  width: 44px;
  text-align: right;
  padding: 18px 12px 18px 18px;
  user-select: none;
  color: var(--md-on-surface-variant);
  opacity: 0.6;
  border: none;
  background: transparent;
  vertical-align: top;
  font-family: var(--md-font-mono);
  font-size: 13px;
  line-height: 1.65;
}

.highlight .code {
  padding: 0;
  border: none;
  background: transparent;
  vertical-align: top;
}

.highlight pre {
  background: transparent;
  margin: 0;
  padding: 18px 20px 18px 4px;
  border-radius: 0;
  overflow-x: auto;
}

.highlight .hljs-keyword,
.highlight .hljs-selector-tag,
.highlight .hljs-literal,
.highlight .hljs-doctag { color: var(--md-primary); }

.highlight .hljs-string,
.highlight .hljs-regexp,
.highlight .hljs-addition { color: var(--md-tertiary); }

.highlight .hljs-comment,
.highlight .hljs-quote { color: var(--md-on-surface-variant); font-style: italic; }

.highlight .hljs-number,
.highlight .hljs-symbol,
.highlight .hljs-bullet { color: var(--md-tertiary); }

.highlight .hljs-title,
.highlight .hljs-title.function_,
.highlight .hljs-section,
.highlight .hljs-deletion { color: var(--md-primary-container); }

.highlight .hljs-attr,
.highlight .hljs-attribute,
.highlight .hljs-variable,
.highlight .hljs-template-variable,
.highlight .hljs-params { color: var(--md-secondary); }

.highlight .hljs-built_in,
.highlight .hljs-type,
.highlight .hljs-class .hljs-title,
.highlight .hljs-title.class_ { color: var(--md-tertiary); }

.highlight .hljs-meta,
.highlight .hljs-meta .hljs-keyword { color: var(--md-primary); }

.highlight .hljs-emphasis { font-style: italic; }
.highlight .hljs-strong { font-weight: 700; }
.highlight .hljs-link { text-decoration: underline; }

/* ---------- 18. 响应式（M3 breakpoints） ---------- */
@media (min-width: 600px) { /* medium+ */
  .app-bar-nav { display: flex; }
  #menu-toggle { display: none; }
}

@media (max-width: 599px) { /* compact */
  #menu-toggle { display: inline-flex; }
  .app-bar-nav { display: none; }
  .app-bar-inner { height: 60px; }
  .brand-logo { width: 30px; height: 30px; }
  .brand-name { font-size: 20px; }
  .hero { padding: 40px 26px; }
  .card-content { padding: 20px; }
  .post-article { padding: 24px 20px; }
  .post-nav { grid-template-columns: 1fr; }
  .post-nav-link.next { text-align: left; align-items: flex-start; }
  .fab { right: 16px; bottom: 16px; }

  /* 状态横幅：窄屏纵向堆叠，避免行内换行/右对齐游离造成凌乱 */
  .status-banner {
    align-items: flex-start;
    gap: 8px 10px;
    padding: 14px;
  }
  .status-dot { margin-top: 5px; }
  .status-text {
    flex: 1;
    min-width: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 3px;
  }
  .status-updated {
    margin-left: 0;
    width: 100%;
    white-space: normal;
  }
}

@media (min-width: 1100px) { /* expanded: 文章 + 目录两栏 */
  .post-layout { grid-template-columns: minmax(0, 1fr) 220px; }
  .toc-column { display: block; }
}

/* ---------- 19. 动效与细节 ---------- */
::selection {
  background: var(--md-primary);
  color: var(--md-on-primary);
}

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--md-background); }
::-webkit-scrollbar-thumb {
  background: var(--md-outline-variant);
  border-radius: 6px;
  border: 2px solid var(--md-background);
}
::-webkit-scrollbar-thumb:hover { background: var(--md-outline); }

:focus-visible {
  outline: 2px solid var(--md-primary);
  outline-offset: 2px;
  border-radius: var(--md-shape-xs);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
}

/* ---------- 16. 跨页面转场动画（View Transitions，MPA 平滑跳转） ---------- */
/* 点击标签、导航、文章链接等站内跳转时平滑过渡；Firefox 暂不支持则保持原跳转 */
@media (prefers-reduced-motion: no-preference) {
  @view-transition {
    navigation: auto;
  }

  /* 顶部应用栏在页面切换时保持稳定，避免整页淡入淡出造成“双重标题”闪烁 */
  .top-app-bar {
    view-transition-name: app-bar;
  }

  ::view-transition-old(root) {
    animation: vt-page-out 0.24s var(--md-motion-emphasized-decelerate) both;
  }

  ::view-transition-new(root) {
    animation: vt-page-in 0.24s var(--md-motion-emphasized-decelerate) both;
  }
}

@keyframes vt-page-out {
  to {
    opacity: 0;
    transform: scale(0.99);
  }
}

@keyframes vt-page-in {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
}