/* ========================================
   门窗外贸英语学习平台 - V2 视觉增强主题
   渐变色彩 · 毛玻璃 · 动态光效 · 微交互
   加载于 style.css 之后，覆盖增强所有界面
   ======================================== */

/* ===== Google Fonts ===== */
@import url('https://fonts.googleapis.com/css2?family=Sora:wght@400;500;600;700;800&family=Inter:wght@400;500;600;700&display=swap');

/* ===== 设计令牌覆盖 ===== */
:root {
  /* 主渐变色系 */
  --accent: #6366f1;
  --accent2: #8b5cf6;
  --accent3: #06b6d4;
  --accent-grad: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
  --accent-grad-h: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
  --cyan-grad: linear-gradient(135deg, #06b6d4 0%, #0ea5e9 100%);

  /* 状态色 */
  --success: #10b981;
  --success-light: #ecfdf5;
  --warning: #f59e0b;
  --warning-light: #fffbeb;
  --danger: #ef4444;
  --danger-light: #fef2f2;

  /* 背景 / 文字 */
  --bg: #f0f1fe;
  --bg2: #ffffff;
  --ink: #0f172a;
  --muted: #64748b;
  --rule: #e2e8f0;

  /* 侧边栏 - 深色渐变 */
  --sidebar-bg: #0f0f23;
  --sidebar-text: #94a3b8;
  --sidebar-active: #818cf8;

  /* 阴影 - 更深更有层次 */
  --shadow-sm: 0 1px 3px rgba(99, 102, 241, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 16px rgba(99, 102, 241, 0.1), 0 2px 6px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 12px 32px rgba(99, 102, 241, 0.15), 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-glow: 0 0 24px rgba(99, 102, 241, 0.25);

  /* 圆角 */
  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 999px;

  /* 过渡 */
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);

  /* 侧边栏宽度 */
  --sidebar-width: 250px;

  /* 兼容旧变量 */
  --primary: #6366f1;
  --primary-light: #818cf8;
  --primary-dark: #4f46e5;
  --bg-white: #ffffff;
  --text-primary: #0f172a;
  --text-secondary: #64748b;
  --text-light: #94a3b8;
  --border: #e2e8f0;
  --error: #ef4444;
  --error-light: #fef2f2;
}

/* ===== 基础排版 ===== */
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Noto Sans SC', sans-serif;
  background: var(--bg);
  color: var(--ink);
  background-image:
    radial-gradient(ellipse 80% 60% at 20% 0%, rgba(99, 102, 241, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse 60% 50% at 80% 100%, rgba(139, 92, 246, 0.05) 0%, transparent 50%);
  background-attachment: fixed;
}

h1, h2, h3, h4, .section-title, .learn-title, .login-title {
  font-family: 'Sora', 'Inter', 'Noto Sans SC', sans-serif;
  letter-spacing: -0.02em;
}

/* ===== 动画关键帧 ===== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.92); }
  to { opacity: 1; transform: scale(1); }
}
@keyframes slideInLeft {
  from { opacity: 0; transform: translateX(-20px); }
  to { opacity: 1; transform: translateX(0); }
}
@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}
@keyframes pulseGlow {
  0%, 100% { box-shadow: 0 0 0 0 rgba(99, 102, 241, 0.3); }
  50% { box-shadow: 0 0 0 8px rgba(99, 102, 241, 0); }
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}
@keyframes gradientShift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}
@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ===== 侧边栏 - 深色渐变 + 发光效果 ===== */
.sidebar {
  background: linear-gradient(180deg, #0f0f23 0%, #1a1a3e 50%, #1e1b4b 100%);
  border-right: 1px solid rgba(129, 140, 248, 0.1);
}

.sidebar::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 300px;
  background: radial-gradient(ellipse at top, rgba(99, 102, 241, 0.12) 0%, transparent 70%);
  pointer-events: none;
}

.sidebar-logo {
  padding: 28px 22px 22px;
  border-bottom: 1px solid rgba(129, 140, 248, 0.08);
}

.sidebar-logo svg,
.sidebar-logo .logo-icon {
  background: var(--accent-grad) !important;
  border-radius: 10px !important;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

.sidebar-logo-text {
  font-family: 'Sora', sans-serif !important;
  font-size: 15px !important;
  font-weight: 700 !important;
  background: linear-gradient(135deg, #fff 0%, #c7d2fe 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.sidebar-logo-text span {
  color: #64748b !important;
  font-size: 10px !important;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.sidebar-nav .nav-link {
  border-left: 3px solid transparent;
  border-radius: 0;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.sidebar-nav .nav-link:hover {
  color: #c7d2fe;
  background: rgba(99, 102, 241, 0.08);
  border-left-color: rgba(129, 140, 248, 0.5);
}

.sidebar-nav .nav-link.active {
  color: #fff;
  background: linear-gradient(90deg, rgba(99, 102, 241, 0.2) 0%, rgba(139, 92, 246, 0.05) 100%);
  border-left-color: var(--sidebar-active);
}

.sidebar-nav .nav-link.active svg {
  color: var(--sidebar-active);
  filter: drop-shadow(0 0 6px rgba(129, 140, 248, 0.5));
}

.cross-nav-badge {
  background: var(--cyan-grad) !important;
  color: #fff !important;
  font-size: 9px !important;
  padding: 2px 7px !important;
  border-radius: 999px !important;
  font-weight: 700;
  letter-spacing: 0.05em;
  box-shadow: 0 2px 8px rgba(6, 182, 212, 0.3);
}

.sidebar-footer {
  border-top: 1px solid rgba(129, 140, 248, 0.08) !important;
}

.sidebar-version {
  color: rgba(100, 116, 139, 0.5) !important;
}

/* ===== 统计横幅 - 渐变卡片 ===== */
.stats-banner {
  background: var(--accent-grad) !important;
  border-radius: var(--radius-lg) !important;
  box-shadow: 0 8px 32px rgba(99, 102, 241, 0.25) !important;
  overflow: hidden;
  position: relative;
  animation: fadeInUp 0.6s ease;
}

.stats-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at top right, rgba(255, 255, 255, 0.15) 0%, transparent 60%);
  pointer-events: none;
}

.stat-item {
  position: relative;
  z-index: 1;
  padding: 24px 16px !important;
}

.stat-value {
  font-family: 'Sora', sans-serif !important;
  font-size: 32px !important;
  font-weight: 800 !important;
  color: #fff !important;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.stat-value.secondary {
  color: #c7d2fe !important;
}

.stat-value.success {
  color: #6ee7b7 !important;
}

.stat-label {
  color: rgba(255, 255, 255, 0.7) !important;
  font-size: 12px !important;
  font-weight: 500;
  letter-spacing: 0.03em;
}

/* ===== 用户状态栏 - 置顶（宽度与内容区域一致）===== */
.user-status-bar-top {
  max-width: none !important;
  width: 100% !important;
  margin-left: 0 !important;
  margin-right: 0 !important;
  margin-top: 0 !important;
  margin-bottom: 20px !important;
  border-radius: var(--radius-lg) !important;
  border: 1px solid rgba(99, 102, 241, 0.1) !important;
  padding: 18px 24px !important;
  background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%) !important;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.2) !important;
  position: relative;
  overflow: hidden;
  animation: fadeInUp 0.5s ease !important;
}

.user-status-bar-top::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at top right, rgba(255, 255, 255, 0.12) 0%, transparent 60%);
  pointer-events: none;
}

.user-status-bar-top .user-status-icon {
  background: rgba(255, 255, 255, 0.25) !important;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.user-status-bar-top .user-status-title {
  color: #fff !important;
  font-size: 16px !important;
}

.user-status-bar-top .user-status-sub {
  color: rgba(255, 255, 255, 0.8) !important;
}

/* ===== 用户状态栏（非置顶，其他页面） ===== */
.user-status-bar {
  background: rgba(255, 255, 255, 0.7) !important;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(99, 102, 241, 0.1) !important;
  border-radius: var(--radius-lg) !important;
  box-shadow: var(--shadow-sm) !important;
  animation: fadeInUp 0.5s ease 0.1s both;
}

/* ===== 置顶栏高优先级覆盖（确保渐变背景不被 .user-status-bar 覆盖）===== */
.user-status-bar.user-status-bar-top {
  max-width: none !important;
  width: 100% !important;
  margin-left: 0 !important;
  margin-right: 0 !important;
  margin-top: 0 !important;
  margin-bottom: 20px !important;
  border-radius: var(--radius-lg) !important;
  border: 1px solid rgba(99, 102, 241, 0.1) !important;
  padding: 18px 24px !important;
  background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%) !important;
  backdrop-filter: none !important;
  -webkit-backdrop-filter: none !important;
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.2) !important;
  position: relative;
  overflow: hidden;
  animation: fadeInUp 0.5s ease !important;
}

.user-status-icon {
  background: var(--accent-grad) !important;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

/* ===== 登录/注册按钮 - 幽灵按钮（白字透明底）===== */
.user-status-btn {
  background: rgba(255, 255, 255, 0.18) !important;
  color: #fff !important;
  font-size: 15px !important;
  font-weight: 700 !important;
  padding: 10px 28px !important;
  letter-spacing: 0.03em;
  border: 1.5px solid rgba(255, 255, 255, 0.5) !important;
  border-radius: var(--radius-full) !important;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.1);
  transition: var(--transition-spring);
  position: relative;
  z-index: 2;
}

.user-status-btn:hover {
  background: rgba(255, 255, 255, 0.3) !important;
  color: #fff !important;
  border-color: rgba(255, 255, 255, 0.8) !important;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

/* 置顶栏中的按钮 - 白色文字 + 透明边框 */
.user-status-bar-top .user-status-btn {
  background: rgba(255, 255, 255, 0.2) !important;
  color: #fff !important;
  border: 1.5px solid rgba(255, 255, 255, 0.55) !important;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.user-status-bar-top .user-status-btn:hover {
  background: rgba(255, 255, 255, 0.35) !important;
  color: #fff !important;
  border-color: rgba(255, 255, 255, 0.9) !important;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
}

/* 已登录状态的按钮（我的邀请）- 同样白字透明底 */
.user-status-btn-primary,
.user-status-btn.user-status-btn-primary {
  background: rgba(255, 255, 255, 0.2) !important;
  color: #fff !important;
  border: 1.5px solid rgba(255, 255, 255, 0.5) !important;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.user-status-btn-primary:hover {
  background: rgba(255, 255, 255, 0.3) !important;
  color: #fff !important;
}

/* ===== 每日贴士 - 毛玻璃卡片 ===== */
.daily-tip {
  background: rgba(255, 255, 255, 0.7) !important;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.5) !important;
  border-radius: var(--radius-lg) !important;
  box-shadow: var(--shadow-sm) !important;
  animation: fadeInUp 0.5s ease 0.2s both;
  transition: var(--transition);
}

.daily-tip:hover {
  box-shadow: var(--shadow-md) !important;
  transform: translateY(-2px);
}

.daily-tip-icon {
  background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%) !important;
  border-radius: var(--radius-sm) !important;
  animation: float 3s ease-in-out infinite;
}

/* ===== 获客系统导流Banner ===== */
.cross-promo-banner {
  background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%) !important;
  border: 1px solid rgba(99, 102, 241, 0.2) !important;
  border-radius: var(--radius-lg) !important;
  overflow: hidden;
  position: relative;
  animation: fadeInUp 0.5s ease 0.3s both;
  transition: var(--transition);
}

.cross-promo-banner::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 60%;
  height: 200%;
  background: radial-gradient(ellipse, rgba(6, 182, 212, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

.cross-promo-icon {
  background: var(--cyan-grad) !important;
  box-shadow: 0 4px 12px rgba(6, 182, 212, 0.3);
}

.cross-promo-title {
  font-family: 'Sora', sans-serif !important;
  color: #fff !important;
}

.cross-promo-desc {
  color: #94a3b8 !important;
}

.cross-promo-btn {
  background: var(--cyan-grad) !important;
  box-shadow: 0 4px 12px rgba(6, 182, 212, 0.3);
  transition: var(--transition-spring);
}

.cross-promo-banner:hover .cross-promo-btn {
  transform: translateX(4px);
  box-shadow: 0 6px 20px rgba(6, 182, 212, 0.4);
}

/* ===== Section 标题 ===== */
.section-title {
  font-size: 20px !important;
  font-weight: 700 !important;
  font-family: 'Sora', sans-serif !important;
}

.section-title-icon {
  background: var(--accent-grad);
  color: #fff !important;
  width: 28px !important;
  height: 28px !important;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 3px 10px rgba(99, 102, 241, 0.3);
}

.section-title-icon svg {
  width: 14px !important;
  height: 14px !important;
}

/* ===== 筛选标签 ===== */
.filter-tab {
  border: 1.5px solid var(--rule) !important;
  background: rgba(255, 255, 255, 0.6) !important;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: var(--radius-full) !important;
  font-weight: 600 !important;
  transition: var(--transition-spring);
}

.filter-tab:hover {
  border-color: var(--accent) !important;
  color: var(--accent) !important;
  transform: translateY(-1px);
}

.filter-tab.active {
  background: var(--accent-grad) !important;
  border-color: transparent !important;
  color: #fff !important;
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.35);
}

/* ===== 课程卡片 - 毛玻璃 + 渐变边框 ===== */
.course-list {
  gap: 18px !important;
}

.course-card {
  background: rgba(255, 255, 255, 0.75) !important;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: var(--radius-lg) !important;
  box-shadow: var(--shadow-sm) !important;
  transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
  animation: fadeInUp 0.4s ease both;
}

.course-card:nth-child(1) { animation-delay: 0.05s; }
.course-card:nth-child(2) { animation-delay: 0.1s; }
.course-card:nth-child(3) { animation-delay: 0.15s; }
.course-card:nth-child(4) { animation-delay: 0.2s; }
.course-card:nth-child(5) { animation-delay: 0.25s; }
.course-card:nth-child(6) { animation-delay: 0.3s; }
.course-card:nth-child(7) { animation-delay: 0.35s; }
.course-card:nth-child(8) { animation-delay: 0.4s; }
.course-card:nth-child(n+9) { animation-delay: 0.45s; }

.course-card::before {
  width: 4px !important;
  border-radius: 0 4px 4px 0;
}

.course-card[data-level="beginner"]::before,
.course-card.beginner::before {
  background: linear-gradient(180deg, #10b981 0%, #34d399 100%) !important;
}

.course-card[data-level="intermediate"]::before,
.course-card.intermediate::before {
  background: linear-gradient(180deg, #f59e0b 0%, #fbbf24 100%) !important;
}

.course-card[data-level="advanced"]::before,
.course-card.advanced::before {
  background: linear-gradient(180deg, #ef4444 0%, #f87171 100%) !important;
}

.course-card:hover {
  transform: translateY(-6px) !important;
  box-shadow: 0 16px 40px rgba(99, 102, 241, 0.15), 0 4px 12px rgba(0, 0, 0, 0.06) !important;
  border-color: rgba(99, 102, 241, 0.2);
}

.course-card:hover::before {
  width: 5px !important;
}

.course-unit-badge {
  background: var(--accent-grad) !important;
  border-radius: var(--radius-sm) !important;
  box-shadow: 0 3px 10px rgba(99, 102, 241, 0.25);
  font-family: 'Sora', sans-serif !important;
  transition: var(--transition-spring);
}

.course-card:hover .course-unit-badge {
  transform: scale(1.08);
  box-shadow: 0 4px 16px rgba(99, 102, 241, 0.35);
}

.course-title-cn {
  font-weight: 600 !important;
  font-family: 'Sora', 'Noto Sans SC', sans-serif !important;
}

.course-level-tag {
  font-weight: 700 !important;
  letter-spacing: 0.02em;
}

.course-level-tag.beginner {
  background: linear-gradient(135deg, #ecfdf5 0%, #d1fae5 100%) !important;
  color: #059669 !important;
}

.course-level-tag.intermediate {
  background: linear-gradient(135deg, #fffbeb 0%, #fef3c7 100%) !important;
  color: #d97706 !important;
}

.course-level-tag.advanced {
  background: linear-gradient(135deg, #fef2f2 0%, #fee2e2 100%) !important;
  color: #dc2626 !important;
}

/* 课程卡片进度条 - 渐变 + 闪烁 */
.progress-wrapper .progress-fill,
.progress-bar-fill {
  background: linear-gradient(90deg, #6366f1, #8b5cf6, #06b6d4) !important;
  background-size: 200% 100% !important;
  animation: shimmer 3s linear infinite;
  border-radius: 2px !important;
}

.progress-wrapper .progress-fill.complete {
  background: linear-gradient(90deg, #10b981, #34d399) !important;
  animation: none;
}

.progress-text {
  color: var(--accent) !important;
  font-family: 'Sora', sans-serif !important;
}

.progress-text.complete {
  color: var(--success) !important;
}

/* 锁定遮罩升级 */
.course-lock-overlay {
  background: linear-gradient(to top, rgba(99, 102, 241, 0.95) 0%, rgba(139, 92, 246, 0.88) 60%, rgba(139, 92, 246, 0) 100%) !important;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.course-lock-overlay .lock-btn {
  background: #fff !important;
  color: var(--accent) !important;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  transition: var(--transition-spring);
}

.course-card.locked:hover .lock-btn {
  transform: scale(1.05);
}

/* ===== 模式标签（学习页） ===== */
.mode-tabs {
  background: rgba(255, 255, 255, 0.8) !important;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(99, 102, 241, 0.08) !important;
  gap: 2px !important;
  padding: 8px 16px !important;
}

.mode-tab {
  border-radius: var(--radius-sm) !important;
  border-bottom: none !important;
  padding: 10px 12px !important;
  font-weight: 600 !important;
  transition: var(--transition-spring);
  position: relative;
}

.mode-tab.active {
  color: #fff !important;
  background: var(--accent-grad) !important;
  box-shadow: 0 3px 12px rgba(99, 102, 241, 0.3);
}

.mode-tab:hover:not(.active) {
  color: var(--accent) !important;
  background: rgba(99, 102, 241, 0.06) !important;
}

/* ===== 句子卡片（学习页核心） ===== */
.sentence-card {
  background: rgba(255, 255, 255, 0.8) !important;
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: var(--radius-lg) !important;
  box-shadow: var(--shadow-md) !important;
  animation: scaleIn 0.4s ease;
}

/* ===== 学习页头部 ===== */
.learn-header {
  background: linear-gradient(135deg, #ffffff 0%, #f0f1fe 100%) !important;
  border-bottom: 1px solid rgba(99, 102, 241, 0.08) !important;
  box-shadow: 0 1px 8px rgba(99, 102, 241, 0.04) !important;
}

.learn-header .btn-back {
  background: var(--accent-grad) !important;
  color: #fff !important;
  box-shadow: 0 3px 10px rgba(99, 102, 241, 0.25);
  transition: var(--transition-spring);
}

.learn-header .btn-back:hover {
  transform: translateX(-2px);
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.35);
}

/* ===== 按钮 - 全局渐变升级 ===== */
.btn-login,
.btn-code,
.btn-primary,
button[class*="btn"]:not(.btn-back):not(.mode-tab):not(.filter-tab):not(.nav-link):not(.btn-third) {
  transition: var(--transition-spring);
}

/* ===== 加载动画 ===== */
.spinner {
  width: 36px !important;
  height: 36px !important;
  border: 3px solid rgba(99, 102, 241, 0.15) !important;
  border-top-color: var(--accent) !important;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.loading-spinner {
  padding: 60px 20px !important;
}

/* ===== 空状态 ===== */
.empty-state-icon {
  color: rgba(99, 102, 241, 0.2) !important;
}

/* ===== 底部导航 - 毛玻璃 ===== */
.bottom-nav {
  background: rgba(255, 255, 255, 0.85) !important;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-top: 1px solid rgba(99, 102, 241, 0.08) !important;
  box-shadow: 0 -4px 20px rgba(99, 102, 241, 0.08) !important;
}

.bottom-nav .nav-item.active {
  color: var(--accent) !important;
}

.bottom-nav .nav-item.active svg {
  filter: drop-shadow(0 0 6px rgba(99, 102, 241, 0.3));
}

/* ===== 顶部导航栏 ===== */
.top-nav {
  background: rgba(255, 255, 255, 0.85) !important;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(99, 102, 241, 0.08) !important;
}

/* ===== 学习页内容区背景 ===== */
.learn-content,
.learn-inner {
  background: linear-gradient(180deg, #f0f1fe 0%, #f8f9ff 100%) !important;
}

body:has(.learn-content) {
  background: linear-gradient(180deg, #f0f1fe 0%, #f8f9ff 100%) !important;
}

/* ===== 入场动画类 ===== */
.animate-in {
  animation: fadeInUp 0.5s ease both;
}

.animate-fade {
  animation: fadeIn 0.4s ease both;
}

.animate-scale {
  animation: scaleIn 0.4s ease both;
}

/* ===== 滚动条美化 ===== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: rgba(99, 102, 241, 0.2);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(99, 102, 241, 0.35);
}

/* ===== 选中文本 ===== */
::selection {
  background: rgba(99, 102, 241, 0.2);
  color: var(--accent);
}

/* ===== 移动端适配 ===== */
@media (max-width: 768px) {
  .stats-banner {
    border-radius: var(--radius-md) !important;
  }

  .stat-value {
    font-size: 26px !important;
  }

  .course-card {
    background: rgba(255, 255, 255, 0.9) !important;
  }

  .daily-tip,
  .user-status-bar:not(.user-status-bar-top),
  .cross-promo-banner {
    border-radius: var(--radius-md) !important;
  }

  /* 置顶栏在移动端保持与内容一致宽度 */
  .user-status-bar.user-status-bar-top {
    border-radius: var(--radius-md) !important;
    width: 100% !important;
    margin-left: 0 !important;
    margin-right: 0 !important;
    margin-top: 0 !important;
    padding: 14px 16px !important;
    display: flex !important;
    align-items: center !important;
    justify-content: space-between !important;
    gap: 10px !important;
  }

  /* 移动端缩小头像图标，防止撑大 */
  .user-status-bar.user-status-bar-top .user-status-icon {
    width: 36px !important;
    height: 36px !important;
    flex-shrink: 0 !important;
  }

  .user-status-bar.user-status-bar-top .user-status-icon svg {
    width: 18px !important;
    height: 18px !important;
  }

  .user-status-bar.user-status-bar-top .user-status-title {
    font-size: 14px !important;
  }

  .user-status-bar.user-status-bar-top .user-status-sub {
    font-size: 11px !important;
  }

  /* 移动端登录按钮 - 明显的幽灵按钮 */
  .user-status-bar.user-status-bar-top .user-status-btn {
    padding: 8px 18px !important;
    font-size: 13px !important;
    background: rgba(255, 255, 255, 0.2) !important;
    color: #fff !important;
    border: 1.5px solid rgba(255, 255, 255, 0.55) !important;
    border-radius: var(--radius-full) !important;
    text-decoration: none !important;
    display: inline-flex !important;
    align-items: center !important;
    justify-content: center !important;
    flex-shrink: 0 !important;
    font-weight: 700 !important;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
  }

  .user-status-bar.user-status-bar-top .user-status-left {
    gap: 10px !important;
  }

  .bottom-nav {
    padding: 8px 0 !important;
  }

  .bottom-nav .nav-item {
    font-size: 10px !important;
  }

  .bottom-nav .nav-item svg {
    width: 20px !important;
    height: 20px !important;
  }
}

/* ===== 暗色背景文字对比增强 ===== */
.sidebar .nav-link {
  font-weight: 500;
}

/* ===== 通用卡片悬停光效 ===== */
.course-card::after,
.daily-tip::after,
.user-status-bar::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.15), transparent);
  transition: left 0.6s ease;
  pointer-events: none;
  z-index: 1;
}

.course-card:hover::after,
.daily-tip:hover::after,
.user-status-bar:hover::after {
  left: 100%;
}

/* ===== 确保光效不干扰交互 ===== */
.course-card > * {
  position: relative;
  z-index: 2;
}

/* ===== 听写模式输入框升级 ===== */
.dictation-input,
input[type="text"].dictation-input,
input[type="text"][class*="dictation"] {
  border: 2px solid var(--rule) !important;
  border-radius: var(--radius-sm) !important;
  transition: var(--transition);
  background: rgba(255, 255, 255, 0.9) !important;
}

.dictation-input:focus,
input[type="text"].dictation-input:focus,
input[type="text"][class*="dictation"]:focus {
  border-color: var(--accent) !important;
  box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
  outline: none;
}

/* ===== 导航按钮（前后翻页） ===== */
.btn-nav {
  background: var(--accent-grad) !important;
  color: #fff !important;
  border: none !important;
  border-radius: var(--radius-sm) !important;
  box-shadow: 0 3px 10px rgba(99, 102, 241, 0.25);
  transition: var(--transition-spring);
  font-weight: 600;
}

.btn-nav:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(99, 102, 241, 0.35);
}

.btn-nav:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* ===== 音频播放按钮 ===== */
.btn-sound,
button[onclick*="playSound"],
button[onclick*="speak"],
.btn-play {
  background: var(--cyan-grad) !important;
  color: #fff !important;
  border: none !important;
  box-shadow: 0 3px 10px rgba(6, 182, 212, 0.25);
  transition: var(--transition-spring);
}

.btn-sound:hover,
button[onclick*="playSound"]:hover,
button[onclick*="speak"]:hover,
.btn-play:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 16px rgba(6, 182, 212, 0.35);
}

/* ===== 重听按钮 ===== */
.btn-replay {
  background: rgba(99, 102, 241, 0.08) !important;
  color: var(--accent) !important;
  border: 1.5px solid rgba(99, 102, 241, 0.2) !important;
  border-radius: var(--radius-sm) !important;
  padding: 8px 16px !important;
  font-size: 13px !important;
  font-weight: 600 !important;
  display: inline-flex !important;
  align-items: center !important;
  gap: 6px !important;
  cursor: pointer !important;
  transition: var(--transition-spring) !important;
}

.btn-replay:hover {
  background: rgba(99, 102, 241, 0.15) !important;
  border-color: var(--accent) !important;
  transform: translateY(-1px);
}

.btn-replay svg {
  width: 16px !important;
  height: 16px !important;
}

/* 听写模式重听按钮 */
.btn-replay-dictation {
  background: rgba(99, 102, 241, 0.08) !important;
  color: var(--accent) !important;
  border: 1.5px solid rgba(99, 102, 241, 0.2) !important;
  border-radius: var(--radius-full) !important;
  padding: 8px 20px !important;
  font-size: 13px !important;
  font-weight: 600 !important;
  display: inline-flex !important;
  align-items: center !important;
  gap: 6px !important;
  cursor: pointer !important;
  transition: var(--transition-spring) !important;
}

.btn-replay-dictation:hover {
  background: rgba(99, 102, 241, 0.15) !important;
  border-color: var(--accent) !important;
  transform: translateY(-1px);
}

.btn-replay-dictation svg {
  width: 16px !important;
  height: 16px !important;
}

/* 按钮组间距 */
.learn-actions-left {
  display: flex !important;
  gap: 10px !important;
  align-items: center !important;
}

/* ===== 进度条容器 ===== */
.progress-bar-container {
  background: rgba(255, 255, 255, 0.5) !important;
  backdrop-filter: blur(10px);
}

.progress-bar-container .progress-bar {
  height: 4px !important;
  border-radius: 2px !important;
}

/* ===== 主内容区域最大宽度 ===== */
.main-content {
  max-width: 1200px !important;
  padding: 24px 32px 100px !important;
}

/* ===== 课程列表 - 响应式多列网格 ===== */
.course-list {
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)) !important;
  gap: 20px !important;
}

/* ===== 课程卡片内部增强 ===== */
.course-card {
  padding: 20px !important;
}

.course-card .course-unit {
  gap: 14px !important;
}

.course-card .course-title {
  font-size: 15px !important;
}

.course-card .course-desc {
  font-size: 13px !important;
  line-height: 1.5 !important;
}

.course-card .course-meta {
  gap: 14px !important;
  font-size: 12px !important;
}

/* ===== 设置弹窗/模态框 ===== */
.modal-overlay,
div[style*="position:fixed"][style*="z-index:10000"] {
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

/* ===== 会员弹窗升级 ===== */
#membership-prompt-overlay > div,
#membership-lock-overlay {
  border-radius: var(--radius-lg) !important;
}

#membership-prompt-overlay > div {
  background: rgba(255, 255, 255, 0.95) !important;
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  box-shadow: 0 24px 60px rgba(99, 102, 241, 0.2) !important;
}

/* ===== 登录页面增强 ===== */
.login-card,
.login-wrap > div {
  background: rgba(255, 255, 255, 0.85) !important;
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid rgba(255, 255, 255, 0.5);
  box-shadow: 0 24px 60px rgba(99, 102, 241, 0.15), 0 8px 24px rgba(0, 0, 0, 0.05) !important;
}

.login-title {
  font-family: 'Sora', sans-serif !important;
}

.login-tab.active {
  color: var(--accent) !important;
  border-bottom-color: var(--accent) !important;
}

.btn-login {
  background: var(--accent-grad) !important;
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.3) !important;
  transition: var(--transition-spring);
  font-family: 'Sora', sans-serif !important;
  letter-spacing: 0.02em;
}

.btn-login:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(99, 102, 241, 0.4) !important;
}

.btn-code {
  background: rgba(99, 102, 241, 0.08) !important;
  color: var(--accent) !important;
  border: 1px solid rgba(99, 102, 241, 0.15) !important;
  transition: var(--transition-spring);
}

.btn-code:hover {
  background: rgba(99, 102, 241, 0.12) !important;
}

.login-logo svg {
  color: var(--accent) !important;
}

.login-logo-text {
  font-family: 'Sora', sans-serif !important;
  background: var(--accent-grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.login-divider span {
  color: var(--muted) !important;
  font-size: 12px;
}

.btn-third {
  border: 1.5px solid var(--rule) !important;
  transition: var(--transition-spring);
}

.btn-third:hover {
  border-color: #10b981 !important;
  background: rgba(16, 185, 129, 0.04);
}

/* ===== 支付页面 ===== */
.pay-card,
.pay-container > div {
  background: rgba(255, 255, 255, 0.85) !important;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: var(--radius-lg) !important;
  box-shadow: var(--shadow-lg) !important;
}

/* ===== 个人中心页面 ===== */
.profile-card,
.profile-header {
  background: var(--accent-grad) !important;
  border-radius: var(--radius-lg) !important;
  box-shadow: 0 8px 32px rgba(99, 102, 241, 0.25) !important;
  color: #fff;
  position: relative;
  overflow: hidden;
}

.profile-card::before,
.profile-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at top right, rgba(255, 255, 255, 0.15) 0%, transparent 60%);
  pointer-events: none;
}

/* ===== 练习页面 ===== */
.practice-card {
  background: rgba(255, 255, 255, 0.75) !important;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: var(--radius-lg) !important;
  box-shadow: var(--shadow-sm) !important;
  transition: var(--transition);
}

.practice-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md) !important;
}

/* ===== 邀请页面 ===== */
.invite-card {
  background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%) !important;
  border-radius: var(--radius-lg) !important;
  color: #fff;
  position: relative;
  overflow: hidden;
  box-shadow: 0 8px 32px rgba(99, 102, 241, 0.25) !important;
}

/* ===== 全局链接和交互元素 ===== */
a {
  transition: var(--transition);
}

/* ===== 焦点状态 ===== */
button:focus-visible,
a:focus-visible,
input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ===== 学习页 - 听写/口语/选词卡片增强 ===== */
.dictation-card,
.speaking-card {
  background: rgba(255, 255, 255, 0.8) !important;
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid rgba(255, 255, 255, 0.6) !important;
  border-radius: var(--radius-lg) !important;
  box-shadow: var(--shadow-md) !important;
  animation: scaleIn 0.35s ease;
}

.dictation-input {
  border: 2px solid var(--rule) !important;
  border-radius: var(--radius-sm) !important;
  font-family: 'Sora', sans-serif !important;
  font-size: 18px !important;
  text-align: center !important;
  transition: var(--transition);
  background: rgba(255, 255, 255, 0.9) !important;
}

.dictation-input:focus {
  border-color: var(--accent) !important;
  box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.12) !important;
  outline: none !important;
}

.dictation-input.correct {
  border-color: var(--success) !important;
  background: var(--success-light) !important;
  box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.12) !important;
}

.dictation-input.wrong {
  border-color: var(--danger) !important;
  background: var(--danger-light) !important;
  box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.12) !important;
}

.dictation-result,
.speaking-result {
  border-radius: var(--radius-sm) !important;
  font-weight: 600 !important;
  transition: var(--transition);
}

.dictation-result.correct,
.speaking-result.correct {
  background: linear-gradient(135deg, #ecfdf5 0%, #d1fae5 100%) !important;
  color: #059669 !important;
}

.dictation-result.wrong,
.speaking-result.wrong {
  background: linear-gradient(135deg, #fef2f2 0%, #fee2e2 100%) !important;
  color: #dc2626 !important;
}

/* 选词模式 */
.option-btn,
.word-bank .word-btn,
button[class*="word"],
button[class*="option"] {
  background: rgba(255, 255, 255, 0.8) !important;
  border: 1.5px solid var(--rule) !important;
  border-radius: var(--radius-sm) !important;
  font-weight: 600 !important;
  transition: var(--transition-spring);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.option-btn:hover,
.word-bank .word-btn:hover,
button[class*="word"]:hover,
button[class*="option"]:hover {
  border-color: var(--accent) !important;
  color: var(--accent) !important;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.12);
}

.option-btn.selected,
.word-bank .word-btn.selected,
button[class*="word"].selected,
button[class*="option"].selected {
  background: var(--accent-grad) !important;
  color: #fff !important;
  border-color: transparent !important;
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.3);
}

/* 答案区域 */
.answer-area {
  background: rgba(99, 102, 241,0.03) !important;
  border: 2px dashed rgba(99, 102, 241, 0.2) !important;
  border-radius: var(--radius-md) !important;
  transition: var(--transition);
}

.answer-area.has-words {
  border-color: var(--accent) !important;
  background: rgba(99, 102, 241, 0.04) !important;
}

.answer-area.correct {
  border-color: var(--success) !important;
  background: rgba(16, 185, 129, 0.06) !important;
  border-style: solid !important;
}

/* 烟花/庆祝效果 */
.confetti-container {
  z-index: 9999 !important;
}

.confetti {
  border-radius: 2px !important;
}

/* 播放按钮增强 */
.btn-play {
  background: var(--cyan-grad) !important;
  color: #fff !important;
  border: none !important;
  border-radius: 50% !important;
  box-shadow: 0 4px 14px rgba(6, 182, 212, 0.3);
  transition: var(--transition-spring);
}

.btn-play:hover {
  transform: scale(1.08);
  box-shadow: 0 6px 20px rgba(6, 182, 212, 0.4);
}

.btn-play.playing {
  animation: pulseGlow 1.5s ease-in-out infinite;
}

/* 口语录音按钮 - 按住式 */
.btn-record-hold {
  background: linear-gradient(135deg, #ef4444 0%, #f87171 100%) !important;
  color: #fff !important;
  border: none !important;
  border-radius: var(--radius-full) !important;
  padding: 16px 36px !important;
  font-size: 16px !important;
  font-weight: 700 !important;
  box-shadow: 0 4px 14px rgba(239, 68, 68, 0.3);
  transition: var(--transition-spring);
  cursor: pointer;
  display: inline-flex !important;
  align-items: center;
  gap: 8px;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
}

.btn-record-hold:hover {
  transform: scale(1.05);
  box-shadow: 0 6px 20px rgba(239, 68, 68, 0.4);
}

.btn-record-hold:active {
  transform: scale(0.98);
}

.btn-record-hold.recording-active {
  background: linear-gradient(135deg, #10b981 0%, #34d399 100%) !important;
  box-shadow: 0 4px 20px rgba(16, 185, 129, 0.4);
  animation: pulseGlow 1.5s ease-in-out infinite;
}

.btn-record-hold.recording-active #record-text {
  font-size: 14px;
}

.btn-record-hold #record-timer {
  font-size: 18px;
  font-weight: 800;
  font-family: 'Sora', sans-serif;
  min-width: 30px;
}

.btn-record-hold:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* 兼容旧录音按钮样式 */
.btn-record,
button[class*="record"]:not(.btn-record-hold) {
  background: linear-gradient(135deg, #ef4444 0%, #f87171 100%) !important;
  border: none !important;
  border-radius: 50% !important;
  box-shadow: 0 4px 14px rgba(239, 68, 68, 0.3);
  transition: var(--transition-spring);
}

.btn-record:hover,
button[class*="record"]:not(.btn-record-hold):hover {
  transform: scale(1.08);
  box-shadow: 0 6px 20px rgba(239, 68, 68, 0.4);
}

.btn-record.recording,
button[class*="record"]:not(.btn-record-hold).recording {
  animation: pulseGlow 1s ease-in-out infinite;
}

/* 学习页标题 */
.learn-header h1 {
  font-family: 'Sora', sans-serif !important;
  font-weight: 700 !important;
  letter-spacing: -0.02em;
}

.learn-meta .level-tag {
  background: linear-gradient(135deg, #eef2ff 0%, #e0e7ff 100%) !important;
  color: var(--accent) !important;
  font-weight: 700 !important;
}

/* ===== 减少动画偏好 ===== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}