/* ==========================================================================
   小白学院 · 全站统一设计系统与响应式壳层规范 (page-shell.css)
   Unified Design System & Responsive Shell for All Sub-Pages
   ==========================================================================
   适用范围：
     - / (首页)
     - /dadanci (打单词)
     - /pinyin (拼音练习)
     - /sudoku (数独)
     - /vocab (背单词)
     - /reading (英语绘本)
     - /english (英语训练)
     - /math (数学练习 / 24点 / 心算)
     - /engquiz (英语语法闯关)
     - /hanzi (汉字词典)
     - /wordgame (单词游戏)
     - /apps (移动应用下载)
   ========================================================================== */

/* ── 1. 统一设计令牌 (Design Tokens) ── */
:root {
  --page-bg: #faf6ec;
  --page-bg-warm: #faf7f0;
  --page-max: 1220px;
  --page-focus: 760px;
  --page-pad: clamp(14px, 3.2vw, 32px);

  /* 统一品牌主色体系 */
  --brand-purple: #7c5cff;
  --brand-purple-d: #5b3fd4;
  --brand-purple-light: #9d85ff;
  --brand-gradient: linear-gradient(135deg, #7c5cff 0%, #6d4df0 58%, #5b3fd4 100%);
  --brand-gradient-warm: linear-gradient(135deg, #ff9a5a 0%, #ff6b8b 100%);

  /* 文字颜色体系（柔和高对比） */
  --ink: #33294e;
  --ink-soft: #7d7690;
  --ink-faint: #aaa3ba;

  /* 卡片与边框 */
  --card-bg: #ffffff;
  --card-border: rgba(80, 64, 140, 0.08);
  --card-shadow: 0 12px 34px rgba(90, 70, 160, 0.08), 0 2px 6px rgba(90, 70, 160, 0.04);
  --card-shadow-hover: 0 18px 42px rgba(90, 70, 160, 0.14), 0 4px 12px rgba(90, 70, 160, 0.06);

  /* 圆角规范 */
  --r-xl: 26px;
  --r-lg: 20px;
  --r-md: 14px;
  --r-sm: 8px;
  --r-pill: 9999px;

  /* 字体规范 */
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

/* ── 2. 全局容器与重置规范 ── */
html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans) !important;
  color: var(--ink) !important;
  background-color: var(--page-bg) !important;
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden !important;
  width: 100%;
}

* {
  -webkit-tap-highlight-color: transparent;
  box-sizing: border-box;
}

/* ── 3. 统一浅色主题规范（修正各子页面原暗黑/各异风格） ── */
:root,
html[data-theme="light"],
html:not([data-theme="dark"]) {
  --bg-primary: #faf6ec !important;
  --bg-secondary: #ffffff !important;
  --bg-card: #ffffff !important;
  --bg-card-hover: #faf9f5 !important;
  --bg-input: #f4f0e6 !important;

  --border-color: rgba(80, 64, 140, 0.08) !important;
  --border-glow: rgba(124, 92, 255, 0.25) !important;

  --text-primary: #33294e !important;
  --text-secondary: #7d7690 !important;
  --text-muted: #aaa3ba !important;

  --accent-primary: #7c5cff !important;
  --accent-secondary: #5b3fd4 !important;
  --accent-gradient: linear-gradient(135deg, #7c5cff 0%, #6d4df0 58%, #5b3fd4 100%) !important;
  --accent-glow: rgba(124, 92, 255, 0.22) !important;

  --key-bg: #ffffff !important;
  --key-border: rgba(80, 64, 140, 0.14) !important;
  --key-shadow: 0 4px 0 rgba(80, 64, 140, 0.14) !important;
}

/* 背景光晕统一调为温润紫/橘粉色调 */
.bg-ambient {
  position: fixed; inset: 0; z-index: 0; pointer-events: none; overflow: hidden;
}
.ambient-orb {
  opacity: 0.14 !important; filter: blur(90px) !important;
}
.orb-1 { background: #7c5cff !important; }
.orb-2 { background: #ffb99e !important; }
.orb-3 { background: #a78bfa !important; }

/* ── 4. 统一顶栏导航规范 (Universal Header) ── */
.header,
.hdr-one-row,
.rb-header,
.unified-header {
  position: sticky !important;
  top: 0 !important;
  z-index: 100 !important;
  background: rgba(255, 255, 255, 0.94) !important;
  backdrop-filter: blur(18px) saturate(180%) !important;
  -webkit-backdrop-filter: blur(18px) saturate(180%) !important;
  border-bottom: 1px solid rgba(80, 64, 140, 0.08) !important;
  box-shadow: 0 4px 20px rgba(90, 70, 160, 0.04) !important;
  padding: 10px var(--page-pad) !important;
  width: 100%;
}

.header-container,
.hdr-bar,
.unified-header-container {
  max-width: var(--page-max) !important;
  margin: 0 auto !important;
  padding: 0 !important;
  display: flex !important;
  align-items: center !important;
  justify-content: space-between !important;
  gap: 12px !important;
  flex-wrap: wrap;
}

/* 统一品牌标志 */
.brand,
.unified-brand {
  display: inline-flex !important;
  align-items: center !important;
  gap: 9px !important;
  text-decoration: none !important;
  color: var(--ink) !important;
  font-weight: 900 !important;
  transition: transform 0.18s cubic-bezier(0.34, 1.4, 0.64, 1);
}
.brand:hover,
.unified-brand:hover {
  transform: translateY(-1px);
}

.brand-icon,
.brand-logo {
  width: 38px !important;
  height: 38px !important;
  border-radius: 12px !important;
  background: linear-gradient(135deg, #7c5cff, #5b3fd4) !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  font-size: 20px !important;
  color: #fff !important;
  box-shadow: 0 4px 12px rgba(109, 77, 240, 0.28) !important;
  flex-shrink: 0;
}

.brand-title {
  font-size: 17.5px !important;
  font-weight: 900 !important;
  color: var(--ink) !important;
  background: none !important;
  -webkit-background-clip: initial !important;
  -webkit-text-fill-color: initial !important;
  letter-spacing: -0.3px !important;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.brand-subtag {
  font-size: 12px;
  font-weight: 700;
  color: var(--brand-purple-d);
  background: rgba(124, 92, 255, 0.10);
  border: 1px solid rgba(124, 92, 255, 0.18);
  padding: 2px 8px;
  border-radius: 100px;
  letter-spacing: 0;
}

/* 统一「返回首页」胶囊按钮 */
.home-pill {
  display: inline-flex !important;
  align-items: center !important;
  gap: 6px !important;
  background: #ffffff !important;
  color: var(--brand-purple-d) !important;
  border: 1.5px solid rgba(124, 92, 255, 0.25) !important;
  border-radius: 100px !important;
  padding: 7px 16px !important;
  font-size: 13.5px !important;
  font-weight: 800 !important;
  text-decoration: none !important;
  box-shadow: 0 2px 8px rgba(90, 70, 160, 0.08) !important;
  transition: transform 0.18s cubic-bezier(0.34, 1.4, 0.64, 1), box-shadow 0.18s, border-color 0.18s !important;
}
.home-pill:hover {
  transform: translateY(-2px) !important;
  border-color: var(--brand-purple) !important;
  box-shadow: 0 6px 16px rgba(109, 77, 240, 0.20) !important;
}
.home-pill:active {
  transform: translateY(0) !important;
}

/* 顶栏控制组统一样式 */
.nav-controls,
.hdr-bar-right {
  display: flex !important;
  align-items: center !important;
  gap: 8px !important;
  flex-wrap: wrap;
}

.mode-btn,
.diff-btn,
.book-btn,
.profile-btn,
.settings-btn,
.stat-chip,
.rb-star-pill {
  background: #f4f0e6 !important;
  border: 1px solid rgba(80, 64, 140, 0.08) !important;
  color: var(--ink-soft) !important;
  font-family: inherit !important;
  font-weight: 700 !important;
  border-radius: 100px !important;
  box-shadow: 0 2px 6px rgba(90, 70, 160, 0.04) !important;
  transition: all 0.18s !important;
}
.mode-btn:hover,
.diff-btn:hover,
.book-btn:hover,
.profile-btn:hover,
.settings-btn:hover {
  background: #ece7db !important;
  color: var(--ink) !important;
  transform: translateY(-1px);
}
.mode-btn.active,
.diff-btn.active {
  background: var(--brand-gradient) !important;
  color: #ffffff !important;
  border-color: transparent !important;
  box-shadow: 0 4px 14px rgba(109, 77, 240, 0.28) !important;
}

/* ── 4.1 单行顶栏专用规范 (.hdr-one-row，用于打单词与拼音) ── */
@media (min-width: 769px) {
  .hdr-one-row {
    padding: 8px var(--page-pad) !important;
  }
  .hdr-one-row .hdr-bar {
    flex-wrap: nowrap !important;
    justify-content: flex-start !important;
    gap: clamp(6px, 0.9vw, 12px) !important;
    width: 100% !important;
    max-width: 1360px !important;
  }
  .hdr-one-row .brand {
    flex-shrink: 0 !important;
  }
  .hdr-one-row .brand-title {
    font-size: 16px !important;
    white-space: nowrap !important;
  }
  .hdr-one-row .book-widget,
  .hdr-one-row .select-wrapper {
    flex-shrink: 1 !important;
    min-width: 0 !important;
  }
  .hdr-one-row .book-btn {
    padding: 5px 11px !important;
    font-size: 13px !important;
    white-space: nowrap !important;
    max-width: 200px !important;
    overflow: hidden !important;
    text-overflow: ellipsis !important;
    flex-shrink: 1 !important;
    display: inline-flex !important;
    align-items: center !important;
    gap: 6px !important;
  }
  .hdr-one-row .select-input {
    padding: 5px 24px 5px 10px !important;
    font-size: 13px !important;
    height: 34px !important;
    border-radius: 100px !important;
  }
  /* 模式与难度分段胶囊：紧凑排布，省空间且不折行 */
  .hdr-one-row .mode-group,
  .hdr-one-row .diff-group {
    display: inline-flex !important;
    align-items: center !important;
    flex-shrink: 0 !important;
    background: #eeeae0 !important;
    padding: 3px !important;
    border-radius: 100px !important;
    gap: 2px !important;
    border: 1px solid rgba(80, 64, 140, 0.08) !important;
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.04) !important;
  }
  .hdr-one-row .mode-btn {
    padding: 4px 9px !important;
    font-size: 12px !important;
    border-radius: 100px !important;
    background: transparent !important;
    border: none !important;
    box-shadow: none !important;
    color: var(--ink-soft) !important;
    white-space: nowrap !important;
    line-height: 1.4 !important;
    cursor: pointer;
    transition: all 0.15s !important;
  }
  .hdr-one-row .mode-btn:hover {
    color: var(--ink) !important;
    background: rgba(255, 255, 255, 0.6) !important;
  }
  .hdr-one-row .mode-btn.active {
    background: var(--brand-gradient) !important;
    color: #ffffff !important;
    box-shadow: 0 2px 8px rgba(109, 77, 240, 0.3) !important;
  }
  .hdr-one-row .diff-btn {
    padding: 4px 8px !important;
    font-size: 11.5px !important;
    border-radius: 100px !important;
    background: transparent !important;
    border: none !important;
    box-shadow: none !important;
    color: var(--ink-soft) !important;
    white-space: nowrap !important;
    line-height: 1.4 !important;
    cursor: pointer;
    transition: all 0.15s !important;
  }
  .hdr-one-row .diff-btn:hover {
    color: var(--ink) !important;
    background: rgba(255, 255, 255, 0.6) !important;
  }
  .hdr-one-row .diff-btn.active {
    background: var(--brand-gradient) !important;
    color: #ffffff !important;
    box-shadow: 0 2px 8px rgba(109, 77, 240, 0.3) !important;
  }
  .hdr-one-row .hdr-bar-right {
    margin-left: auto !important;
    display: flex !important;
    align-items: center !important;
    gap: 6px !important;
    flex-shrink: 0 !important;
    flex-wrap: nowrap !important;
  }
  .hdr-one-row .home-pill {
    padding: 5px 12px !important;
    font-size: 13px !important;
    white-space: nowrap !important;
    flex-shrink: 0 !important;
  }
  .hdr-one-row .profile-btn,
  .hdr-one-row .settings-btn {
    padding: 5px 10px !important;
    font-size: 13px !important;
    white-space: nowrap !important;
    flex-shrink: 0 !important;
  }
}

/* 针对较窄桌面或平板横屏 (769px - 1080px)，进一步紧凑收缩，杜绝折成两行 */
@media (min-width: 769px) and (max-width: 1080px) {
  .hdr-one-row {
    padding: 6px 12px !important;
  }
  .hdr-one-row .hdr-bar {
    gap: 5px !important;
  }
  .hdr-one-row .brand-subtag {
    display: none !important;
  }
  .hdr-one-row .book-btn {
    max-width: 130px !important;
  }
  .hdr-one-row .mode-btn {
    padding: 3px 6px !important;
    font-size: 11.5px !important;
  }
  .hdr-one-row .diff-btn {
    padding: 3px 5px !important;
    font-size: 11px !important;
  }
  .hdr-one-row .home-pill span:not(:first-child) {
    display: none !important;
  }
}

@media (min-width: 769px) and (max-width: 900px) {
  .hdr-one-row .profile-btn #profileName {
    display: none !important;
  }
  .hdr-one-row .settings-btn span:last-child {
    display: none !important;
  }
}


/* ── 5. 主内容容器统一 ── */
.app-container,
.main-content,
.vocab-main,
.rb-main,
.hanzi-page .page {
  max-width: var(--page-max) !important;
  width: 100% !important;
  margin: 0 auto !important;
  padding: 20px var(--page-pad) 44px !important;
}

/* 专注型容器（做题卡 / 数独设置） */
.quiz-container,
.sudoku-main .setup-panel {
  max-width: var(--page-focus) !important;
  margin-left: auto !important;
  margin-right: auto !important;
}

/* 卡片统一温润白底与微立体质感 */
.card,
.v-panel,
.typing-card,
.keyboard-section,
.setup-panel,
.game-panel {
  background: var(--card-bg) !important;
  border: 1px solid var(--card-border) !important;
  border-radius: var(--r-lg) !important;
  box-shadow: var(--card-shadow) !important;
}

/* ── 6. 各二级页面专门增强 ── */

/* A. 数独 (/sudoku) 容器增强规范 */
.sudoku-main {
  max-width: 1060px !important;
  margin: 0 auto !important;
  padding: 16px var(--page-pad) 48px !important;
}

/* B. 打单词 & 拼音练习 (/dadanci & /pinyin) 跑道、单词卡与键盘等宽对齐统一 */
.battle-lane,
.typing-card,
.keyboard-section {
  width: 100% !important;
  max-width: 980px !important;
  margin-left: auto !important;
  margin-right: auto !important;
  box-sizing: border-box !important;
}

.battle-lane {
  border-radius: var(--r-lg) !important;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.15) !important;
  border: 1.5px solid rgba(80, 64, 140, 0.12) !important;
}
.letter-box {
  background: #ffffff !important;
  color: var(--ink) !important;
  border: 2px solid rgba(80, 64, 140, 0.16) !important;
  border-radius: 12px !important;
  box-shadow: 0 4px 10px rgba(90, 70, 160, 0.08) !important;
  font-weight: 900 !important;
}
.letter-box.active {
  border-color: var(--brand-purple) !important;
  box-shadow: 0 0 0 3px rgba(124, 92, 255, 0.25) !important;
}
.key {
  background: #ffffff !important;
  color: var(--ink) !important;
  border: 1.5px solid rgba(80, 64, 140, 0.14) !important;
  box-shadow: 0 4px 0 rgba(80, 64, 140, 0.14) !important;
  border-radius: 9px !important;
}
.key.active {
  background: var(--brand-purple) !important;
  border-color: var(--brand-purple) !important;
  color: #fff !important;
}

/* C. 背单词 (/vocab) 卡片增强 */
.v-book-head {
  background: var(--brand-gradient) !important;
  border-radius: var(--r-lg) !important;
  box-shadow: 0 12px 28px rgba(109, 77, 240, 0.28) !important;
}
.v-action-card {
  background: #ffffff !important;
  border: 1px solid rgba(80, 64, 140, 0.08) !important;
  border-radius: var(--r-md) !important;
  box-shadow: 0 4px 12px rgba(90, 70, 160, 0.05) !important;
}
.v-action-card:hover {
  background: #faf9f6 !important;
  border-color: var(--brand-purple-light) !important;
}
.v-task-btn {
  background: var(--brand-gradient) !important;
  box-shadow: 0 4px 12px rgba(109, 77, 240, 0.25) !important;
}

/* D. 英语绘本 (/reading) 书架 */
.rb-grid {
  display: grid !important;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)) !important;
  gap: 16px !important;
}
.rb-card {
  border-radius: var(--r-lg) !important;
  box-shadow: var(--card-shadow) !important;
  transition: transform 0.2s cubic-bezier(0.34, 1.4, 0.64, 1), box-shadow 0.2s !important;
}
.rb-card:hover {
  transform: translateY(-4px) !important;
  box-shadow: var(--card-shadow-hover) !important;
}

/* E. 汉字词典 (/hanzi) 顶栏替换 floating fab */
.site-home-fab {
  display: none !important; /* 隐藏原左上角悬浮标，由统一顶栏接管 */
}

/* ── 7. 全响应式断点适配 (Responsive Layouts) ── */

/* 移动端 (手机屏幕 <= 768px) */
@media (max-width: 768px) {
  :root {
    --page-pad: 14px;
  }

  /* 顶栏紧凑排布：第一行品牌 + 返回主页，第二行滚动工具项 */
  .header,
  .hdr-one-row,
  .rb-header {
    padding: 8px 12px 10px !important;
  }

  .hdr-bar,
  .header-container {
    gap: 8px !important;
    align-items: center !important;
  }

  .brand-title {
    font-size: 15.5px !important;
  }
  .brand-icon {
    width: 32px !important;
    height: 32px !important;
    font-size: 17px !important;
  }

  .home-pill {
    padding: 5px 12px !important;
    font-size: 12.5px !important;
  }

  /* 手机端模式与难度选择：横向滑动不换行断裂 */
  .mode-group,
  .diff-group {
    display: flex !important;
    gap: 4px !important;
    overflow-x: auto !important;
    -webkit-overflow-scrolling: touch !important;
    scrollbar-width: none !important;
    flex-wrap: nowrap !important;
    max-width: 100% !important;
  }
  .mode-group::-webkit-scrollbar,
  .diff-group::-webkit-scrollbar {
    display: none !important;
  }

  .mode-btn {
    padding: 5px 8px !important;
    font-size: 11.5px !important;
    white-space: nowrap !important;
    flex-shrink: 0 !important;
  }
  .diff-btn {
    padding: 5px 7px !important;
    font-size: 11px !important;
    white-space: nowrap !important;
    flex-shrink: 0 !important;
  }

  /* 键盘自适应：手机屏幕绝不横向溢出 */
  .keyboard-section {
    padding: 12px 8px !important;
    border-radius: var(--r-md) !important;
  }
  .keyboard {
    gap: 4px !important;
  }
  .keyboard-row {
    gap: 3px !important;
  }
  .key {
    height: 38px !important;
    min-width: 0 !important;
    flex: 1 !important;
    padding: 0 1px !important;
    font-size: 12px !important;
    border-radius: 6px !important;
  }
  .key-space {
    flex: 3.5 !important;
  }
  .key-wide {
    flex: 1.4 !important;
    font-size: 10px !important;
  }

  /* 跑道缩略 */
  .battle-lane {
    height: 124px !important;
  }
  .letter-box {
    width: clamp(28px, 7.5vw, 40px) !important;
    height: clamp(38px, 10vw, 48px) !important;
    font-size: clamp(18px, 5vw, 24px) !important;
  }

  /* 书架网格 2 列 */
  .rb-grid {
    grid-template-columns: repeat(2, 1fr) !important;
    gap: 10px !important;
  }
}

/* 小屏超窄设备兜底 (<= 400px) */
@media (max-width: 400px) {
  .brand-subtag {
    display: none !important;
  }
  .home-pill span:not(:first-child) {
    display: none !important;
  }
  .home-pill {
    padding: 5px 8px !important;
  }
}