/* AI 高中数学学习诊断系统 — 高阶极简学术风全局设计系统 */

:root {
  /* 亮色模式色彩定义 */
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-card: #ffffff;
  --border-color: #e2e8f0;
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  
  /* 学术状态色 */
  --color-accent: #2563eb;       /* 科技蓝 */
  --color-accent-light: #eff6ff;
  --color-success: #10b981;      /* 晨曦绿 */
  --color-success-light: #ecfdf5;
  --color-warning: #f59e0b;      /* 琥珀黄 */
  --color-warning-light: #fef3c7;
  --color-danger: #ef4444;       /* 胭脂红 */
  --color-danger-light: #fef2f2;
  
  /* 错题分类状态色 */
  --color-err-concept: #ef4444;
  --color-err-concept-bg: #fef2f2;
  --color-err-logic: #f97316;
  --color-err-logic-bg: #fff7ed;
  --color-err-calc: #eab308;
  --color-err-calc-bg: #fef9c3;
  --color-err-mechanic: #a855f7;
  --color-err-mechanic-bg: #faf5ff;

  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Arial", sans-serif;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.03), 0 4px 6px -4px rgba(0, 0, 0, 0.03);
  
  --transition-smooth: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 暗色模式变量覆盖 */
body.dark-mode {
  --bg-primary: #0f172a;       /* 极夜黑 */
  --bg-secondary: #020617;
  --bg-card: #1e293b;          /* 雅灰 */
  --border-color: #334155;
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --color-accent-light: #1e293b;
  --color-success-light: #064e3b;
  --color-warning-light: #78350f;
  --color-danger-light: #7f1d1d;
  
  --color-err-concept-bg: #450a0a;
  --color-err-logic-bg: #431407;
  --color-err-calc-bg: #422006;
  --color-err-mechanic-bg: #3b0764;
  
  --shadow-sm: none;
  --shadow-md: none;
  --shadow-lg: none;
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  line-height: 1.5;
  transition: var(--transition-smooth);
}

/* 布局系统 */
.app-container {
  display: flex;
  min-height: 100vh;
}

/* 侧边栏导航样式 */
.sidebar {
  width: 260px;
  background-color: var(--bg-card);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  padding: 24px 16px;
  position: fixed;
  height: 100vh;
  left: 0;
  top: 0;
  z-index: 100;
  transition: var(--transition-smooth);
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 24px;
}

.sidebar-logo-icon {
  width: 32px;
  height: 32px;
  background-color: var(--color-accent);
  color: white;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
}

.sidebar-logo-text {
  font-weight: 600;
  font-size: 16px;
  letter-spacing: -0.025em;
}

.year-selector-container {
  margin-bottom: 20px;
}

.year-selector {
  width: 100%;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  outline: none;
}

.nav-section-title {
  font-size: 11px;
  text-transform: uppercase;
  color: var(--text-muted);
  font-weight: 700;
  margin: 16px 8px 8px 8px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  display: inline-block;
}
.nav-dot.blue { background-color: var(--color-accent); }
.nav-dot.green { background-color: var(--color-success); }
.nav-dot.purple { background-color: #a855f7; }

.nav-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: var(--transition-smooth);
  margin-bottom: 2px;
  cursor: pointer;
}

.nav-link:hover {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
}

.nav-link.active {
  background-color: var(--color-accent-light);
  color: var(--color-accent);
}

.nav-link-inner {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-icon {
  width: 18px;
  height: 18px;
}

.nav-badge-ai {
  font-size: 9px;
  font-weight: 700;
  background-color: var(--color-accent-light);
  color: var(--color-accent);
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--border-color);
}

.sidebar-user {
  margin-top: auto;
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid var(--border-color);
}

.user-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: var(--color-accent-light);
  color: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
}

.user-info {
  display: flex;
  flex-direction: column;
}

.user-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
}

.user-email {
  font-size: 11px;
  color: var(--text-muted);
}

/* 主内容区域布局 */
.main-content {
  flex: 1;
  margin-left: 260px;
  padding: 40px;
  min-height: 100vh;
  transition: var(--transition-smooth);
}

/* 卡片样式 */
.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-smooth);
  margin-bottom: 24px;
}

.card-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* 网格系统 */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

/* 按钮样式 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition-smooth);
  border: 1px solid transparent;
  outline: none;
}

.btn-primary {
  background-color: var(--color-accent);
  color: white;
}

.btn-primary:hover {
  filter: brightness(1.05);
}

.btn-secondary {
  background-color: var(--bg-card);
  border-color: var(--border-color);
  color: var(--text-secondary);
}

.btn-secondary:hover {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
}

/* 输入框 */
.input-field {
  width: 100%;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background-color: var(--bg-card);
  color: var(--text-primary);
  font-size: 14px;
  transition: var(--transition-smooth);
  outline: none;
}

.input-field:focus {
  border-color: var(--color-accent);
}

/* 标签样式 */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
}

.badge-thin-red { background-color: var(--color-danger-light); color: var(--color-danger); }
.badge-thin-orange { background-color: var(--color-warning-light); color: var(--color-warning); }
.badge-thin-blue { background-color: var(--color-accent-light); color: var(--color-accent); }
.badge-thin-green { background-color: var(--color-success-light); color: var(--color-success); }

/* 页面头部定义 */
.page-header {
  margin-bottom: 32px;
}

.page-title {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
  letter-spacing: -0.03em;
}

.page-subtitle {
  font-size: 14px;
  color: var(--text-secondary);
}

/* 双链并行视图 */
.chain-visualization {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin: 20px 0;
  position: relative;
}

.chain-track {
  display: flex;
  align-items: center;
  gap: 16px;
  position: relative;
}

.chain-track-label {
  width: 80px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
}

.chain-nodes {
  display: flex;
  align-items: center;
  flex: 1;
  gap: 12px;
  position: relative;
}

.chain-node {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 2px solid var(--border-color);
  background-color: var(--bg-card);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  font-weight: bold;
  color: var(--text-secondary);
  position: relative;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.chain-node.passed {
  background-color: var(--color-success);
  border-color: var(--color-success);
  color: white;
}

.chain-node.broken {
  background-color: var(--color-danger);
  border-color: var(--color-danger);
  color: white;
  animation: pulse-red 2s infinite;
}

.chain-node.active {
  border-color: var(--color-accent);
  color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-light);
}

.chain-line {
  flex: 1;
  height: 2px;
  background-color: var(--border-color);
  min-width: 30px;
}

.chain-line.passed {
  background-color: var(--color-success);
}

@keyframes pulse-red {
  0% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.4); }
  70% { box-shadow: 0 0 0 6px rgba(239, 68, 68, 0); }
  100% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0); }
}

/* 抽屉/Drawer 面板 */
.drawer {
  position: fixed;
  right: -420px;
  top: 0;
  width: 420px;
  height: 100vh;
  background-color: var(--bg-card);
  border-left: 1px solid var(--border-color);
  box-shadow: -4px 0 24px rgba(0, 0, 0, 0.05);
  z-index: 200;
  transition: right 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
  padding: 32px 24px;
}

.drawer.open {
  right: 0;
}

.drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.drawer-title {
  font-size: 18px;
  font-weight: 600;
}

.drawer-close {
  cursor: pointer;
  background: none;
  border: none;
  font-size: 20px;
  color: var(--text-secondary);
}

.drawer-content {
  flex: 1;
  overflow-y: auto;
}

/* H5 独立导航与布局 */
.h5-container {
  max-width: 480px;
  margin: 0 auto;
  background-color: var(--bg-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  position: relative;
  box-shadow: 0 0 32px rgba(0,0,0,0.05);
}

.h5-header {
  padding: 16px;
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 90;
}

.h5-content {
  flex: 1;
  padding: 16px;
  padding-bottom: 80px;
  overflow-y: auto;
}

.h5-tabbar {
  position: fixed;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: 480px;
  height: 64px;
  background-color: var(--bg-card);
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-around;
  z-index: 100;
}

.h5-tab-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  font-size: 10px;
  color: var(--text-secondary);
  cursor: pointer;
  gap: 4px;
}

.h5-tab-item.active {
  color: var(--color-accent);
}

.h5-camera-btn {
  width: 48px;
  height: 48px;
  background-color: var(--color-accent);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: -24px;
  box-shadow: 0 4px 10px rgba(37, 99, 235, 0.3);
}

/* 错题卡片与一题三做 */
.mistake-card {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px;
  background-color: var(--bg-card);
  margin-bottom: 16px;
  position: relative;
  transition: var(--transition-smooth);
}

.three-pass-tabs {
  display: flex;
  border-bottom: 1px solid var(--border-color);
  margin: 12px 0;
  gap: 16px;
}

.three-pass-tab {
  padding: 6px 0;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: var(--transition-smooth);
}

.three-pass-tab.active {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}