/* =========================================================
   🔥 POLICY DESIGN SYSTEM - BASE (ENTERPRISE READY)
   包含：多主题支持 / 完整流体排版 / 组件规范 / 原子类
   ========================================================= */

/* =========================================================
   1️⃣ BASE TOKENS (设计变量)
   ========================================================= */
:root {
  /* --- 保持原有的字号档位不变 --- */
  --fs-12: clamp(0.625rem, 0.6rem + 0.2vw, 0.75rem);
  --fs-14: clamp(0.75rem, 0.7rem + 0.2vw, 0.875rem);
  --fs-16: clamp(0.875rem, 0.8rem + 0.2vw, 1rem);
  --fs-18: clamp(1rem, 0.95rem + 0.2vw, 1.125rem);
  --fs-20: clamp(1.125rem, 1.05rem + 0.2vw, 1.25rem);
  --fs-22: clamp(1.125rem, 1rem + 0.4vw, 1.375rem);
  --fs-24: clamp(1.25rem, 1.15rem + 0.4vw, 1.5rem);
  --fs-26: clamp(1.375rem, 1.25rem + 0.4vw, 1.625rem);
  --fs-28: clamp(1.5rem, 1.4rem + 0.4vw, 1.75rem);
  --fs-30: clamp(1.625rem, 1.5rem + 0.4vw, 1.875rem);
  --fs-32: clamp(1.625rem, 1.45rem + 0.6vw, 2rem);
  --fs-34: clamp(1.75rem, 1.6rem + 0.6vw, 2.125rem);
  --fs-36: clamp(1.875rem, 1.7rem + 0.6vw, 2.25rem);
  --fs-38: clamp(2rem, 1.85rem + 0.6vw, 2.375rem);
  --fs-40: clamp(2.125rem, 1.95rem + 0.6vw, 2.5rem);
  --fs-42: clamp(2.25rem, 2.1rem + 0.6vw, 2.625rem);
  --fs-44: clamp(2.25rem, 2rem + 0.8vw, 2.75rem);
  --fs-46: clamp(2.375rem, 2.15rem + 0.8vw, 2.875rem);
  --fs-48: clamp(2.5rem, 2.25rem + 0.8vw, 3rem);
  --fs-50: clamp(2.625rem, 2.4rem + 0.8vw, 3.125rem);
  --fs-52: clamp(2.75rem, 2.55rem + 0.8vw, 3.25rem);
  --fs-54: clamp(2.75rem, 2.45rem + 1vw, 3.375rem);
  --fs-56: clamp(2.875rem, 2.6rem + 1vw, 3.5rem);
  --fs-58: clamp(3rem, 2.75rem + 1vw, 3.625rem);
  --fs-60: clamp(3.125rem, 2.85rem + 1vw, 3.75rem);

  /* 🏷️ 语义化字号映射 */
  --font-size-xs: var(--fs-12);
  --font-size-sm: var(--fs-14);
  --font-size-base: var(--fs-16);
  --font-size-md: var(--fs-18);
  --font-size-lg: var(--fs-20);
  --font-size-xl: var(--fs-24);
  --font-size-2xl: var(--fs-32);
  --font-size-3xl: var(--fs-40);
  --font-size-4xl: var(--fs-48);
  --font-size-5xl: var(--fs-60);

  /* 字重 */
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-bold: 600;

  /* 间距与布局 */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-base: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;

  --container-max-width: 87.5rem;
  --container-padding: 1.5rem;
  --grid-min: 18.75rem;

  /* 布局宽度（响应式） */
  --sidebar-width: clamp(15rem, 20vw, 20rem); /* 侧边栏：240-320px */
  --outline-width: clamp(12rem, 15vw, 16rem); /* 目录：192-256px */
  --content-min-width: clamp(18rem, 40vw, 36rem); /* 内容最小宽度 */

  /* 圆角与阴影 */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --shadow-sm: 0 2px 6px
    color-mix(in srgb, var(--color-primary) 20%, rgba(0, 0, 0, 0.06));
  --shadow-md: 0 8px 24px
    color-mix(in srgb, var(--color-primary) 20%, rgba(0, 0, 0, 0.08));

  /* 动效与层级 */
  --ease-base: cubic-bezier(0.4, 0, 0.2, 1);
  --duration-fast: 0.2s;
  --z-dropdown: 1000;
  --z-modal: 2000;

  /* 滚动条 */
  --scrollbar-size: 0.5rem;
  --scrollbar-radius: 999px;
  --scrollbar-track: transparent;
  --scrollbar-thumb: rgba(0, 0, 0, 0.15);
  --scrollbar-thumb-hover: rgba(0, 0, 0, 0.25);
  --scrollbar-thumb-active: rgba(0, 0, 0, 0.35);
  --scroll-progress-color: var(--color-primary);
}

/* =========================================================
   2️⃣ THEMES (精细化组件代币控制)
   ========================================================= */

/* 🌈 默认主题 (Light) */
:root,
:root[data-theme='light'] {
  color-scheme: light;

  --color-primary: #20766f;
  --color-primary-hover: #195f5a;
  --color-primary-text: #ffffff;

  /* OKLAB 高级色值定义 */
  --foreground: 0 0% 9%;
  --color-black: #000;
  --color-white: #fff;
  --color-light: #cce0f5;

  /* 全局背景：多重马卡龙叠加 */
  --color-bg:
    radial-gradient(
      1200px 800px at 0% 0%,
      rgb(162, 210, 255) 0%,
      transparent 60%
    ),
    radial-gradient(
      1200px 800px at 50% 0%,
      rgb(212, 236, 255) 0%,
      transparent 50%
    ),
    radial-gradient(
      1000px 600px at 100% 0%,
      rgb(184, 220, 255) 0%,
      transparent 55%
    ),
    radial-gradient(
      1000px 800px at 20% 8%,
      rgb(254, 226, 101) 0%,
      transparent 40%
    ),
    radial-gradient(
      1200px 900px at 80% 5%,
      rgb(197, 223, 160) 0%,
      transparent 45%
    ),
    radial-gradient(
      1200px 1000px at 0% 15%,
      rgb(200, 228, 255) 0%,
      transparent 50%
    ),
    radial-gradient(
      1200px 1000px at 50% 12%,
      rgb(190, 238, 98) 0%,
      transparent 40%
    ),
    radial-gradient(
      1200px 1000px at 100% 15%,
      rgb(212, 236, 255) 0%,
      transparent 50%
    ),
    radial-gradient(
      1200px 1000px at 30% 22%,
      rgb(232, 220, 160) 0%,
      transparent 42%
    ),
    radial-gradient(
      1200px 1000px at 70% 20%,
      rgb(162, 210, 255) 0%,
      transparent 45%
    ),
    radial-gradient(
      1200px 1000px at 0% 30%,
      rgb(212, 236, 255) 0%,
      transparent 48%
    ),
    radial-gradient(
      1200px 1000px at 50% 30%,
      rgb(200, 228, 255) 0%,
      transparent 42%
    ),
    radial-gradient(
      1200px 1000px at 100% 30%,
      rgb(197, 223, 160) 0%,
      transparent 45%
    ),
    radial-gradient(
      1200px 1000px at 20% 40%,
      rgb(184, 220, 255) 0%,
      transparent 45%
    ),
    radial-gradient(
      1200px 1000px at 60% 38%,
      rgb(232, 220, 160) 0%,
      transparent 40%
    ),
    radial-gradient(
      1200px 1000px at 90% 42%,
      rgb(162, 210, 255) 0%,
      transparent 45%
    ),
    radial-gradient(
      1200px 1000px at 10% 52%,
      rgb(162, 210, 255) 0%,
      transparent 45%
    ),
    radial-gradient(1200px 1000px, rgb(212, 236, 255) 0%, transparent 42%),
    radial-gradient(
      1200px 1000px at 85% 55%,
      rgb(200, 228, 255) 0%,
      transparent 45%
    ),
    radial-gradient(
      1200px 1000px at 30% 62%,
      rgb(197, 223, 160) 0%,
      transparent 40%
    ),
    radial-gradient(
      1200px 1000px at 70% 60%,
      rgb(184, 220, 255) 0%,
      transparent 42%
    ),
    radial-gradient(
      1200px 1000px at 0% 70%,
      rgb(200, 228, 255) 0%,
      transparent 45%
    ),
    radial-gradient(
      1200px 1000px at 50% 70%,
      rgb(232, 220, 160) 0%,
      transparent 40%
    ),
    radial-gradient(
      1200px 1000px at 100% 72%,
      rgb(212, 236, 255) 0%,
      transparent 45%
    ),
    radial-gradient(
      1200px 1000px at 20% 80%,
      rgb(184, 220, 255) 0%,
      transparent 42%
    ),
    radial-gradient(
      1200px 1000px at 60% 82%,
      rgb(162, 210, 255) 0%,
      transparent 40%
    ),
    radial-gradient(
      1200px 1000px at 0% 90%,
      rgb(212, 236, 255) 0%,
      transparent 45%
    ),
    radial-gradient(
      1200px 1000px at 50% 92%,
      rgb(240, 232, 176) 0%,
      transparent 38%
    ),
    radial-gradient(
      1200px 1000px at 100% 90%,
      rgb(184, 220, 255) 0%,
      transparent 45%
    ),
    linear-gradient(
      rgb(200, 228, 255) 0%,
      rgb(212, 236, 255) 20%,
      rgb(200, 228, 255) 40%,
      rgb(212, 236, 255) 60%,
      rgb(200, 228, 255) 80%,
      rgb(212, 236, 255) 100%
    ),
    rgb(184, 220, 255);

  --color-card: rgba(255, 255, 255, 0.72);
  --color-tag-bg: rgba(220, 229, 227, 0.96);
  --border-color: rgba(182, 216, 209, 0.5);
  --border-fcolor: rgba(178, 204, 189, 0.8);

  --color-text: #080f2a;
  --color-text-secondary: #17233d;

  --color-success: #007a52;
  --color-warning: #ff8f1f;
  --color-danger: #b42318;
  --color-success-bg: #e6f8f1;
  --color-warning-bg: #fff4e8;
  --color-danger-bg: #feeeee;

  --scrollbar-track: transparent;
  --scrollbar-thumb: color-mix(in srgb, var(--color-primary) 35%, #a6b6c8);
  --scrollbar-thumb-hover: var(--color-primary);

  /* 🔥 你的定制 Banner 设置 (已完全保留) */
  --banner-bg:
    url(pba-trgline.png) center center / cover no-repeat,
    linear-gradient(
      to right bottom,
      #a6db50,
      #93dd70,
      #85dd8c,
      #7fdca3,
      #83d9b6,
      #82d5ba,
      #83d1be,
      #85cdc0,
      #79c8bb,
      #6cc3b7,
      #5fbeb3,
      #50b9af
    );
  --banner-text-color: #fff;
  --banner-input-color: #043f37;
  /* 🌟 组件精细化变量：Banner内部组件 */
  --glass-bg: rgba(255, 255, 255, 0.1);
  --glass-border: rgba(255, 255, 255, 0.2);
  --pba-tab-text: color-mix(in oklab, hsl(var(--foreground)) 75%, transparent);
  --pba-tab-bg: color-mix(in oklab, var(--color-white) 36%, transparent);
  --pba-tab-bg-hover: color-mix(in oklab, var(--color-white) 55%, transparent);
  --pba-hot-text: color-mix(in oklab, hsl(var(--foreground)) 55%, transparent);
  --pba-hot-link-bg: color-mix(in oklab, var(--color-white) 28%, transparent);
  --pba-ctab-bg: color-mix(in oklab, var(--color-light) 36%, transparent);
  --pba-ctab-bg-hover: color-mix(in oklab, var(--color-light) 55%, transparent);

  /* 🌟 多彩柔和代币 (用于专题卡片和标签云) */
  --tint-blue-bg: rgba(237, 245, 255, 0.8);
  --tint-blue-text: #3b82f6;
  --tint-green-bg: rgba(240, 253, 244, 0.8);
  --tint-green-text: #22c55e;
  --tint-orange-bg: rgba(255, 247, 237, 0.8);
  --tint-orange-text: #f97316;
  --tint-purple-bg: rgba(250, 245, 255, 0.8);
  --tint-purple-text: #a855f7;
  --tint-gray-bg: rgba(243, 244, 246, 0.8);
  --tint-gray-text: #6b7280;

  --footer-bg: rgba(255, 255, 255, 0.4);
  --footer-text: var(--color-text);
  --footer-border: rgba(255, 255, 255, 0.5);
}

/* 🌑 暗黑主题 (融入 Google AI Studio 风格) */
:root[data-theme='dark'] {
  color-scheme: dark;

  /* Google AI Studio 偏爱极其清晰的淡蓝色作为按钮高亮 */
  --color-primary: #a8c7fa;
  --color-primary-hover: #d3e3fc;
  --color-primary-text: #041e49; /* 按钮底色亮，文字必须深色 */

  --foreground: 0 0% 76%;
  --color-black: #000000;
  --color-white: #191919;

  /* 融入 Google 风格：极其深邃的“木炭灰/午夜灰蓝”底色 */
  --color-bg: #131314;
  --color-card: #1e1f20; /* Google M3 规范的 Surface Container色 */
  --color-tag-bg: rgba(255, 255, 255, 0.08);

  /* 文字颜色：灰白与次级灰 */
  --color-text: #e3e3e3;
  --color-text-secondary: #c4c7c5;
  --border-color: #444746; /* Google 极具辨识度的边框色 */

  --color-success: #81c995;
  --color-warning: #fde293;
  --color-danger: #f28b82;

  /* Banner 背景：结合极客黑与你的深海光晕，使之更平滑沉稳 */
  --banner-bg: radial-gradient(
    ellipse 150% 150% at 30% 0%,
    rgba(20, 50, 60, 0.2) 0%,
    rgba(19, 19, 20, 0.8) 50%,
    #131314 100%
  );
  --banner-text-color: #e3e3e3;
  --banner-input-color: #849ed1;
  /* 🌟 组件精细化变量：暗黑模式专属控制 */
  --glass-bg: rgba(0, 0, 0, 0.1);
  --glass-border: rgba(255, 255, 255, 0.05);
  --pba-tab-text: color-mix(in oklab, hsl(var(--foreground)) 85%, transparent);
  --pba-tab-bg: color-mix(in oklab, var(--color-white) 96%, transparent);
  --pba-tab-bg-hover: color-mix(
    in oklab,
    var(--color-primary-hover) 12%,
    transparent
  );
  --pba-tab-active-bg: color-mix(
    in oklab,
    var(--color-primary) 56%,
    transparent
  );

  --pba-hot-text: color-mix(in oklab, hsl(var(--foreground)) 55%, transparent);
  --pba-hot-link-bg: color-mix(in oklab, var(--color-white) 78%, transparent);

  /* 🌟 暗黑模式：降低背景透明度，提亮文字，拒绝刺眼荧光 */
  --tint-blue-bg: rgba(59, 130, 246, 0.15);
  --tint-blue-text: #93c5fd;
  --tint-green-bg: rgba(34, 197, 94, 0.15);
  --tint-green-text: #86efac;
  --tint-orange-bg: rgba(249, 115, 22, 0.15);
  --tint-orange-text: #fdba74;
  --tint-purple-bg: rgba(168, 85, 247, 0.15);
  --tint-purple-text: #d8b4fe;
  --tint-gray-bg: rgba(156, 163, 175, 0.15);
  --tint-gray-text: #d1d5db;

  --footer-bg: rgba(0, 0, 0, 0.4);
  --footer-text: var(--color-text);
  --footer-border: rgba(255, 255, 255, 0.05);
}

/* 🌊 科技蓝主题 (保持原样) */
:root[data-theme='blue'] {
  color-scheme: light;
  --color-primary: #003b7d;
  --color-primary-hover: #15559a;
  --color-primary-text: #ffffff;

  --color-bg: #f0f4f9;
  --color-card: #ffffff;
  --color-tag-bg: #e5edf8;
  --border-color: #dbe4f0;

  --color-text: #17233d;
  --color-text-secondary: #5c6b8a;

  --color-success: #007a52;
  --color-warning: #ff8f1f;
  --color-danger: #b42318;
  --color-success-bg: #e6f8f1;
  --color-warning-bg: #fff4e8;
  --color-danger-bg: #feeeee;

  --banner-bg: linear-gradient(172deg, #002061 0%, #003b7d 55%, #15559a 100%);
  --banner-text-color: #ffffff;
  --banner-input-color: #fff;
  /* 🌟 组件代币回落，确保蓝主题不报错 */
  --glass-bg: rgba(255, 255, 255, 0.08);
  --glass-border: rgba(255, 255, 255, 0.15);
  --pba-tab-text: rgba(255, 255, 255, 0.8);
  --pba-tab-bg: rgba(255, 255, 255, 0.15);
  --pba-tab-bg-hover: rgba(255, 255, 255, 0.25);
  --pba-hot-text: rgba(255, 255, 255, 0.8);
  --pba-hot-link-bg: rgba(255, 255, 255, 0.15);

  /* 🌟 多彩柔和代币 (用于专题卡片和标签云) */
  --tint-blue-bg: rgba(212, 233, 255, 0.8);
  --tint-blue-text: #3b82f6;
  --tint-green-bg: rgba(240, 253, 244, 0.8);
  --tint-green-text: #22c55e;
  --tint-orange-bg: rgba(255, 247, 237, 0.8);
  --tint-orange-text: #f97316;
  --tint-purple-bg: rgba(250, 245, 255, 0.8);
  --tint-purple-text: #a855f7;
  --tint-gray-bg: rgba(230, 235, 246, 0.8);
  --tint-gray-text: #6b7280;

  --footer-bg: rgba(14, 44, 110, 1);
  --footer-text: rgba(152, 166, 209, 0.96);
  --footer-border: rgba(255, 255, 255, 0.1);
}

/* =========================================================
   3️⃣ BASE RESET (基础重置)
   ========================================================= */
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  min-height: 100vh;
  font-size: var(--font-size-base);
  color: var(--color-text);
  /* background: var(--color-bg);
  background-attachment: fixed;
  background-size: cover;
  background-position: center; */
  font-family:
    -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  transition:
    background-color var(--duration-fast) var(--ease-base),
    color var(--duration-fast) var(--ease-base);
  position: relative;
}

body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 100%;
  background: linear-gradient(
    90deg,
    var(--scroll-progress-color),
    var(--color-primary-hover)
  );
  z-index: 9999;
  transform-origin: left;
  transform: scaleX(var(--scroll-progress, 0));
  will-change: transform;
}
body::after {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -1;
  background: var(--color-bg);
  background-size: cover;
  background-position: center;
  transition: background var(--duration-fast) var(--ease-base);
  will-change: background;
}
h1,
h2,
h3 {
  margin: 0;
  font-weight: var(--font-weight-bold);
}
a {
  text-decoration: none;
  color: inherit;
}

html {
  scrollbar-width: thin;
  scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
}
::-webkit-scrollbar {
  width: var(--scrollbar-size);
  height: var(--scrollbar-size);
}
::-webkit-scrollbar-track {
  background: var(--scrollbar-track);
}
::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: var(--scrollbar-radius);
  transition:
    background 0.25s ease,
    transform 0.2s ease;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--scrollbar-thumb-hover);
}
::-webkit-scrollbar-thumb:active {
  background: var(--scrollbar-thumb-active);
}
html:not(:hover)::-webkit-scrollbar-thumb {
  opacity: 0;
}
html:hover::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
}

/* =========================================================
   4️⃣ COMPONENTS (业务组件)
   ========================================================= */
.card {
  background: var(--color-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  box-shadow: var(--shadow-sm);
  transition: all var(--duration-fast) var(--ease-base);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.card:hover {
  box-shadow: var(--shadow-md);
}

.btn {
  padding: 0.6em 1.2em;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  font-size: var(--font-size-sm);
  transition: all var(--duration-fast) var(--ease-base);
}
.btn-primary {
  background: var(--color-primary);
  color: var(--color-primary-text);
}
.btn-primary:hover {
  background: var(--color-primary-hover);
}
.btn:active {
  transform: scale(0.97);
}
.btn[disabled] {
  opacity: 0.5;
  cursor: not-allowed;
}

.input,
.search-input {
  padding: 0.6em 1em;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  width: 100%;
  background: transparent;
  color: inherit;
  transition: all var(--duration-fast) var(--ease-base);
  font-size: var(--font-size-sm);
}
.input:focus,
.search-input:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 1px;
  border-color: transparent;
}

.tag {
  display: inline-block;
  padding: 0.2em 0.6em;
  font-size: var(--font-size-xs);
  border-radius: var(--radius-sm);
  background: var(--color-tag-bg);
  border: 1px solid transparent;
}
.tag-success {
  color: var(--color-success);
  background: var(--color-success-bg);
}
.tag-warning {
  color: var(--color-warning);
  background: var(--color-warning-bg);
}
.tag-danger {
  color: var(--color-danger);
  background: var(--color-danger-bg);
}

.filter-panel {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  padding: var(--space-sm) 0;
}
.filter-item {
  padding: 0.3em 0.8em;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: var(--font-size-xs);
  transition: all var(--duration-fast);
}
.filter-item.active {
  background: var(--color-primary);
  color: var(--color-primary-text);
  border-color: var(--color-primary);
}

.timeline {
  border-left: 2px solid var(--border-color);
  padding-left: var(--space-md);
}
.timeline-item {
  position: relative;
  margin-bottom: var(--space-md);
}
.timeline-item::before {
  content: '';
  position: absolute;
  left: calc(var(--space-md) * -1 - 6px);
  top: 5px;
  width: 10px;
  height: 10px;
  background: var(--color-primary);
  border-radius: 50%;
}
.timeline-date {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
}
.timeline-content {
  margin-top: 0.3em;
}

.policy-item {
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--border-color);
}
.policy-title {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-medium);
  margin-bottom: 0.3em;
}
.policy-meta {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  margin-top: 0.3em;
}

.interpret-card {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  background: var(--color-tag-bg);
  border-left: 4px solid var(--color-primary);
}
.interpret-title {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-sm);
}
.interpret-content {
  font-size: var(--font-size-sm);
  line-height: 1.7;
}

/* 5️⃣ 6️⃣ 布局与断点 */
.maxcontainer {
  width: 100%;
  position: relative;
  display: flow-root;
}
.container {
  width: 100%;
  max-width: var(--container-max-width);
  /* padding-inline: var(--container-padding); */
  margin: 0 auto;
}

.grid-fluid {
  display: grid;
  gap: var(--space-md);
  grid-template-columns: repeat(auto-fit, minmax(var(--grid-min), 1fr));
}
.flex {
  display: flex;
}
.flex-wrap {
  flex-wrap: wrap;
}
.flex-col {
  flex-direction: column;
}
.items-center {
  align-items: center;
}
.justify-between,
.flex-between {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.gap-sm {
  gap: var(--space-sm);
}
.gap-md {
  gap: var(--space-md);
}
.mt-sm {
  margin-top: var(--space-sm);
}
.mt-md {
  margin-top: var(--space-md);
}
.mb-sm {
  margin-bottom: var(--space-sm);
}
.py-sm {
  padding-top: var(--space-sm);
  padding-bottom: var(--space-sm);
}
.text-center {
  text-align: center;
}
.text-right {
  text-align: right;
}
.text-secondary,
.text-sub {
  color: var(--color-text-secondary);
}
.w-full {
  width: 100%;
}
.hidden {
  display: none;
}
.transition {
  transition: all var(--duration-fast) var(--ease-base);
}
.hoverable:hover {
  opacity: 0.85;
}
.disabled {
  opacity: 0.5;
  pointer-events: none;
}
.scrollbar {
  overflow: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
}
.scrollbar::-webkit-scrollbar {
  width: var(--scrollbar-size);
}
.scrollbar-card {
  --scrollbar-size: 6px;
  --scrollbar-thumb: rgba(0, 0, 0, 0.1);
}
.empty {
  text-align: center;
  padding: 40px;
  color: var(--color-text-secondary);
}
.skeleton {
  height: 14px;
  background: var(--border-color);
  border-radius: 4px;
  margin-bottom: 8px;
  animation: pulse 1.5s infinite ease-in-out;
}
@keyframes pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}
/* =========================================================
   6️⃣ MEDIA QUERIES (响应式断点)
   ========================================================= */
.m-hide {
  display: block;
}
.pc-hide {
  display: none;
}
/* =========================================================
   无障碍与跨设备基线
   ========================================================= */
.skip-link {
  position: fixed;
  top: 0.5rem;
  left: 0.5rem;
  z-index: 10000;
  padding: 0.75rem 1rem;
  border-radius: 0.375rem;
  color: #fff;
  background: #111;
  transform: translateY(-150%);
  transition: transform 0.15s ease;
}

.skip-link:focus {
  transform: translateY(0);
}

@media print {
  .skip-link {
    display: none !important;
  }
}

:where(a, button, input, select, textarea, [tabindex]):focus-visible {
  outline: 0.1875rem solid #ffbf47;
  outline-offset: 0.1875rem;
}

#app:focus {
  outline: none;
}

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

body {
  overflow-wrap: anywhere;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

.pba-toolbar .nav-trigger {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0;
  border: 0;
  color: inherit;
  background: transparent;
  font: inherit;
  opacity: 0.9;
  cursor: pointer;
}

.pba-toolbar .nav-trigger:hover,
.pba-toolbar .nav-trigger:focus-visible {
  opacity: 1;
}

.theme-menu[aria-hidden='true'] {
  pointer-events: none;
}

@media (pointer: coarse) {
  :where(button, input, select, textarea, a.btn, a.nav-trigger, .pg-btn) {
    min-width: 2.75rem;
    min-height: 2.75rem;
  }
  a.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@media (forced-colors: active) {
  :where(a, button, input, select, textarea, [tabindex]):focus-visible {
    outline: 0.1875rem solid Highlight;
  }

  .card,
  .theme-menu,
  .nav-dropdown-menu {
    border: 0.0625rem solid CanvasText;
  }
}

@media (max-width: 1024px) {
  .container {
    padding-inline: var(--container-padding);
  }
}
@media (max-width: 768px) {
  :root {
    --fs-12: 0.75rem;
  }

  .m-hide {
    display: none !important;
  }
  .pc-hide {
    display: block !important;
  }
  .pba-toolbar .nav-trigger {
    gap: 0;
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  /* Tablet */
}
@media (min-width: 1025px) and (max-width: 1440px) {
  /* Laptop */
}
@media (min-width: 1441px) and (max-width: 1920px) {
  /* Desktop */
}

@media (min-width: 1921px) {
  html {
    font-size: clamp(16px, 0.8333vw, 32px);
  }
  .container {
    max-width: 90vw;
  }
}

/* =========================================================
   🔥 超高分辨率字号增强 (2K/4K 显示器)
   ========================================================= */
@media (min-width: 2560px) {
  :root {
    --fs-12: 0.875rem; /* 14px */
    --fs-14: 1rem; /* 16px */
    --fs-16: 1.25rem; /* 20px */
    --fs-18: 1.5rem; /* 24px */
    --fs-20: 1.75rem; /* 28px */
    --fs-22: 2rem; /* 32px */
    --fs-24: 2.25rem; /* 36px */
    --fs-26: 2.5rem; /* 40px */
    --fs-28: 2.75rem; /* 44px */
    --fs-30: 3rem; /* 48px */
  }
}

@media (min-width: 3840px) {
  :root {
    --fs-12: 1rem; /* 16px */
    --fs-14: 1.25rem; /* 20px */
    --fs-16: 1.5rem; /* 24px */
    --fs-18: 1.875rem; /* 30px */
    --fs-20: 2.25rem; /* 36px */
    --fs-22: 2.5rem; /* 40px */
    --fs-24: 3rem; /* 48px */
    --fs-26: 3.25rem; /* 52px */
    --fs-28: 3.5rem; /* 56px */
    --fs-30: 3.75rem; /* 60px */
  }
}