/* ============================================================
   common.css — 全局基础样式：设计变量、重置、布局、通用组件
   导航栏样式在 header.css，页脚样式在 footer.css
   ============================================================ */

/* ---------- 设计变量（亮色 / 暗色） ---------- */
:root {
  --bg: #fffbf7;            /* 白日模式页面底色（暖白，非纯白） */
  --surface: #ffffff;
  --surface-2: #f7f7f9;
  --text: #1b1b1f;
  --text-2: #5f626b;
  --border: #e9e9ee;
  --border-strong: rgba(255, 59, 48, 0.4);
  --primary: #ff3b30;
  --primary-strong: #d92c20;
  --primary-soft: rgba(255, 59, 48, 0.09);
  --primary-gradient: linear-gradient(135deg, #ff3b30 0%, #ff8a80 100%);
  --title-gradient: linear-gradient(90deg, #e60000 0%, #ff4d3d 55%, #ffb3ad 100%);
  --logo-color: #ff3b30;
  --header-bg: rgba(255, 255, 255, 0.85);
  --shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.06), 0 1px 3px rgba(16, 24, 40, 0.1);
  --shadow-md: 0 4px 12px rgba(16, 24, 40, 0.08);
  --shadow-lg: 0 16px 40px rgba(16, 24, 40, 0.12);
  --radius: 14px;
  --radius-sm: 8px;
  --header-h: 64px;
  --font: system-ui, -apple-system, "Segoe UI", "PingFang SC",
          "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

[data-theme="dark"] {
  --bg: #000000;
  --surface: #111114;
  --surface-2: #1a1a1f;
  --text: #f2f3f7;
  --text-2: #a1a6b4;
  --border: #26262c;
  --border-strong: rgba(255, 59, 48, 0.5);
  --primary: #ff4d3d;
  --primary-strong: #ff7a6e;
  --primary-soft: rgba(255, 59, 48, 0.14);
  --primary-gradient: linear-gradient(135deg, #ff4d3d 0%, #ff8a80 100%);
  --title-gradient: linear-gradient(90deg, #ff3b30 0%, #ff8a80 60%, #ffffff 100%);
  --logo-color: #ff4d3d;
  --header-bg: rgba(0, 0, 0, 0.82);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.5), 0 1px 3px rgba(0, 0, 0, 0.6);
  --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 16px 44px rgba(0, 0, 0, 0.6);
}

/* ---------- 字体颜色主题（蓝紫渐变等） ---------- */
html[data-accent="bluepurple"] {
  --primary: #6d5ef7;
  --primary-strong: #5748e0;
  --primary-soft: rgba(109, 94, 247, 0.1);
  --border-strong: rgba(109, 94, 247, 0.45);
  --primary-gradient: linear-gradient(135deg, #6d5ef7 0%, #a78bfa 100%);
  --title-gradient: linear-gradient(90deg, #4f46e5 0%, #7c3aed 55%, #c4b5fd 100%);
}

html[data-accent="bluepurple"][data-theme="dark"] {
  --primary: #8b7cff;
  --primary-strong: #a79bff;
  --primary-soft: rgba(139, 124, 255, 0.14);
  --border-strong: rgba(139, 124, 255, 0.5);
  --primary-gradient: linear-gradient(135deg, #8b7cff 0%, #c4b5fd 100%);
  --title-gradient: linear-gradient(90deg, #60a5fa 0%, #a78bfa 60%, #ffffff 100%);
}

/* ============ 五套渐变配色（亮/暗） ============ */

/* 1) 绿蓝渐变 */
html[data-accent="greenblue"] {
  --primary: #22c55e;
  --primary-strong: #16a34a;
  --primary-soft: rgba(34, 197, 94, 0.1);
  --border-strong: rgba(34, 197, 94, 0.45);
  --primary-gradient: linear-gradient(135deg, #22c55e 0%, #38bdf8 100%);
  --title-gradient: linear-gradient(90deg, #15803d 0%, #0ea5e9 60%, #bae6fd 100%);
}

html[data-accent="greenblue"][data-theme="dark"] {
  --primary: #4ade80;
  --primary-strong: #86efac;
  --primary-soft: rgba(74, 222, 128, 0.15);
  --border-strong: rgba(74, 222, 128, 0.5);
  --primary-gradient: linear-gradient(135deg, #4ade80 0%, #38bdf8 100%);
  --title-gradient: linear-gradient(90deg, #6ee7b7 0%, #38bdf8 60%, #ffffff 100%);
}

/* 2) 红白渐变（默认红系，白化收尾） */
html[data-accent="red"] {
  --primary: #ff3b30;
  --primary-strong: #d92c20;
  --primary-soft: rgba(255, 59, 48, 0.09);
  --border-strong: rgba(255, 59, 48, 0.4);
  --primary-gradient: linear-gradient(135deg, #ff3b30 0%, #ffb3ad 100%);
  --title-gradient: linear-gradient(90deg, #e60000 0%, #ff4d3d 55%, #ffc9c2 100%);
}

html[data-accent="red"][data-theme="dark"] {
  --primary: #ff4d3d;
  --primary-strong: #ff8a80;
  --primary-soft: rgba(255, 59, 48, 0.14);
  --border-strong: rgba(255, 59, 48, 0.5);
  --primary-gradient: linear-gradient(135deg, #ff4d3d 0%, #ffb3ad 100%);
  --title-gradient: linear-gradient(90deg, #ff3b30 0%, #ff8a80 60%, #ffffff 100%);
}

/* 3) 红紫渐变 */
html[data-accent="redpurple"] {
  --primary: #f43f5e;
  --primary-strong: #e11d48;
  --primary-soft: rgba(244, 63, 94, 0.1);
  --border-strong: rgba(244, 63, 94, 0.45);
  --primary-gradient: linear-gradient(135deg, #ff3b30 0%, #a855f7 100%);
  --title-gradient: linear-gradient(90deg, #e11d48 0%, #9333ea 60%, #e9d5ff 100%);
}

html[data-accent="redpurple"][data-theme="dark"] {
  --primary: #fb7185;
  --primary-strong: #fda4af;
  --primary-soft: rgba(251, 113, 133, 0.15);
  --border-strong: rgba(251, 113, 133, 0.5);
  --primary-gradient: linear-gradient(135deg, #fb7185 0%, #a855f7 100%);
  --title-gradient: linear-gradient(90deg, #fda4af 0%, #c084fc 60%, #ffffff 100%);
}

/* 4) 橙白渐变 */
html[data-accent="orange"] {
  --primary: #f97316;
  --primary-strong: #ea580c;
  --primary-soft: rgba(249, 115, 22, 0.1);
  --border-strong: rgba(249, 115, 22, 0.45);
  --primary-gradient: linear-gradient(135deg, #fb923c 0%, #ffd9b0 100%);
  --title-gradient: linear-gradient(90deg, #c2410c 0%, #f97316 55%, #ffd7a8 100%);
}

html[data-accent="orange"][data-theme="dark"] {
  --primary: #fb923c;
  --primary-strong: #fcd34d;
  --primary-soft: rgba(251, 146, 60, 0.15);
  --border-strong: rgba(251, 146, 60, 0.5);
  --primary-gradient: linear-gradient(135deg, #fb923c 0%, #ffd9b0 100%);
  --title-gradient: linear-gradient(90deg, #f97316 0%, #fbbf24 60%, #ffffff 100%);
}

/* 5) 青白渐变 */
html[data-accent="cyan"] {
  --primary: #06b6d4;
  --primary-strong: #0891b2;
  --primary-soft: rgba(6, 182, 212, 0.1);
  --border-strong: rgba(6, 182, 212, 0.45);
  --primary-gradient: linear-gradient(135deg, #22d3ee 0%, #d9fbff 100%);
  --title-gradient: linear-gradient(90deg, #0e7490 0%, #06b6d4 55%, #b3f3ff 100%);
}

html[data-accent="cyan"][data-theme="dark"] {
  --primary: #22d3ee;
  --primary-strong: #67e8f9;
  --primary-soft: rgba(34, 211, 238, 0.15);
  --border-strong: rgba(34, 211, 238, 0.5);
  --primary-gradient: linear-gradient(135deg, #22d3ee 0%, #a5f3fc 100%);
  --title-gradient: linear-gradient(90deg, #22d3ee 0%, #67e8f9 60%, #ffffff 100%);
}

/* ---------- 重置 ---------- */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background 0.3s ease, color 0.3s ease;
  animation: page-fade-in 0.4s ease both;
}

/* ---------- 页面跳转动画 ---------- */
@keyframes page-fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

body.page-exit {
  opacity: 0;
  transition: opacity 0.28s ease;
}

@media (prefers-reduced-motion: reduce) {
  body {
    animation: none;
  }
}

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

button {
  font: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

img,
svg {
  display: block;
}

ul,
ol {
  list-style: none;
}

/* ---------- 布局工具 ---------- */
.container {
  width: min(88vw, 1440px);
  margin-inline: auto;
}

main {
  min-height: 60vh;
}

/* ---------- 通用小节标题 ---------- */
.section-head {
  margin-bottom: 1.8rem;
}

.section-title {
  font-size: clamp(1.4rem, 2.4vw, 2rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  background: var(--title-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.section-sub {
  color: var(--text-2);
  margin-top: 0.4rem;
  max-width: 640px;
  font-size: 0.98rem;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.35rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  transition: all 0.2s ease;
}

.btn-primary {
  background: var(--primary-gradient);
  color: #fff;
}

.btn-primary:hover {
  filter: brightness(1.08);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-ghost {
  border-color: var(--border);
  background: var(--surface);
  color: var(--text);
}

.btn-ghost:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-1px);
}

/* ---------- 通用卡片 ---------- */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-strong);
}

/* ---------- 搜索框 ---------- */
.search-box {
  position: relative;
}

.search-box .search-icon {
  position: absolute;
  left: 15px;
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  color: var(--text-2);
  pointer-events: none;
}

.search-input {
  width: 100%;
  padding: 0.75rem 1rem 0.75rem 2.7rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-size: 0.95rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.search-input::placeholder {
  color: var(--text-2);
}

.search-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-soft);
}

/* ---------- 搜索无结果提示 ---------- */
.search-empty {
  display: none;
  text-align: center;
  padding: 2.5rem 1rem;
  color: var(--text-2);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  margin-top: 1.5rem;
}

.search-empty.show {
  display: block;
}

/* ---------- 侧边大导航（document / resource 共用） ---------- */
.layout-wrap {
  display: flex;
  align-items: flex-start;
  gap: 1.5vw;
  width: min(60vw, 1080px);
  margin-inline: auto;
  padding-block: 2.2rem;
}

/* 移动端抽屉（默认桌面端隐藏） */
.mobile-drawer {
  display: none;
}

.layout-side {
  flex: 0 0 min(15vw, 25%);
  position: sticky;
  top: calc(var(--header-h) + 24px);
  align-self: flex-start;
}

.layout-main {
  flex: 1 1 auto;
  min-width: 0;
}

.side-nav-title {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-2);
  margin-bottom: 0.9rem;
}

.side-nav-list {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.side-nav-link {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.58rem 0.8rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  color: var(--text-2);
  font-size: 0.92rem;
  transition: all 0.2s ease;
}

.side-nav-link:hover {
  color: var(--text);
  background: var(--surface-2);
}

.side-nav-link.active {
  color: var(--primary);
  background: var(--primary-soft);
  border-color: var(--border-strong);
  font-weight: 600;
}

.side-nav-num {
  font-size: 0.72rem;
  color: var(--text-2);
  opacity: 0.85;
  min-width: 1.4rem;
  font-variant-numeric: tabular-nums;
}

/* ---------- 页面头部（文档/资源页共用） ---------- */
.page-head {
  padding: 2.4rem 0 0.4rem;
}

.page-title {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 800;
  letter-spacing: 0.02em;
  background: var(--title-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.page-sub {
  color: var(--text-2);
  margin-top: 0.4rem;
  max-width: 640px;
}

/* ---------- Toast 提示 ---------- */
.toast {
  position: fixed;
  left: 50%;
  bottom: 28px;
  transform: translate(-50%, 12px);
  background: var(--text);
  color: var(--bg);
  padding: 0.7rem 1.4rem;
  border-radius: 999px;
  font-size: 0.9rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease;
  box-shadow: var(--shadow-lg);
  z-index: 200;
  max-width: 90vw;
  text-align: center;
}

.toast.show {
  opacity: 1;
  transform: translate(-50%, 0);
}

/* ---------- 响应式：侧栏变横向导航条 ---------- */
@media (max-width: 1100px) {
  .layout-wrap {
    width: min(92vw, 1440px);
  }

  /* 移动端不展示侧边目录，用户自行滑动 / 搜索 */
  .layout-side {
    display: none;
  }

  /* 右侧抽屉：主导航 + 主题 + 语言（从汉堡按钮所在侧滑出） */
  .mobile-drawer {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    position: fixed;
    top: var(--header-h);
    left: auto;
    right: 0;
    bottom: 0;
    width: min(78vw, 200px);
    height: auto;
    z-index: 300;
    background: var(--surface);
    border-left: 1px solid var(--border);
    padding: 1.4rem 1.2rem;
    padding-bottom: calc(1.4rem + env(safe-area-inset-bottom, 0px));
    overflow-y: auto;
    overscroll-behavior: contain;
    -webkit-overflow-scrolling: touch;
    transform: translateX(100%);
    visibility: hidden;
    transition: transform 0.3s ease, visibility 0.3s ease;
  }

  .mobile-drawer.open {
    transform: translateX(0);
    visibility: visible;
  }

  .mobile-nav {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
    flex-shrink: 0;
  }

  .mobile-nav .nav-link {
    display: block;
    padding: 0.7rem 0.9rem;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    color: var(--text);
  }

  .mobile-nav .nav-link:hover {
    color: var(--primary);
    background: var(--surface-2);
  }

  .mobile-nav .nav-link.active {
    color: var(--primary);
    background: var(--primary-soft);
    font-weight: 600;
  }

  .mobile-actions {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    border-top: 1px solid var(--border);
    padding-top: 1.2rem;
    flex-shrink: 0;
  }

  /* 抽屉内的小目录（资源目录 / 文档目录） */
  .mobile-side {
    border-top: 1px solid var(--border);
    padding-top: 1.2rem;
  }

  .mobile-side-title {
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--text-2);
    margin-bottom: 0.7rem;
  }

  .mobile-side-list {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
  }

  .mobile-side-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.55rem 0.7rem;
    border-radius: var(--radius-sm);
    color: var(--text-2);
    font-size: 0.9rem;
    transition: all 0.2s ease;
  }

  .mobile-side-link:hover {
    color: var(--text);
    background: var(--surface-2);
  }

  /* 抽屉背后的遮罩 */
  .nav-backdrop {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 290;
    background: rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
  }

  .nav-backdrop.show {
    opacity: 1;
    visibility: visible;
  }

}

@media (max-width: 640px) {
  .layout-wrap {
    width: 94vw;
    padding-block: 1.4rem;
  }
}