/* ─── CSS 变量 ─────────────────────────────────── */

:root {

  --primary: #3B82F6;

  --primary-light: #EFF6FF;

  --primary-dark: #1D4ED8;

  --primary-glow: rgba(59,130,246,.12);

  --success: #10B981;

  --warning: #F59E0B;

  --danger: #EF4444;

  --gray-50: #F8FAFC;

  --gray-100: #F1F5F9;

  --gray-200: #E2E8F0;

  --gray-300: #CBD5E1;

  --gray-400: #94A3B8;

  --gray-500: #64748B;

  --gray-600: #475569;

  --gray-700: #334155;

  --gray-800: #1E293B;

  --gray-900: #0F172A;

  --bg: #F0F7FF;

  --card-bg: rgba(255,255,255,.85);

  --card-bg-solid: #FFFFFF;

  --font: 'PingFang SC', 'Microsoft YaHei', -apple-system, sans-serif;

  --radius: 14px;

  --shadow: 0 1px 3px rgba(0,0,0,.04), 0 4px 16px rgba(59,130,246,.06);

  --shadow-lg: 0 8px 40px rgba(59,130,246,.12);

  --sidebar-w: 232px;

  --header-h: 58px;

  /* 学科颜色 */

  --math: #3B82F6;

  --chinese: #EF4444;

  --english: #10B981;

  --physics: #8B5CF6;

  --chemistry: #F59E0B;

  --biology: #14B8A6;

  --history: #92400E;

  --geography: #0891B2;

  --politics: #374151;

}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 15px; height: 100%; }

body {
  font-family: var(--font);
  background: var(--bg);
  background-image:
    linear-gradient(135deg, rgba(59,130,246,.04) 0%, rgba(99,102,241,.03) 50%, rgba(20,184,166,.04) 100%),
    repeating-linear-gradient(
      135deg,
      transparent,
      transparent 40px,
      rgba(59,130,246,.018) 40px,
      rgba(59,130,246,.018) 80px
    );
  color: var(--gray-700);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

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

button { cursor: pointer; border: none; outline: none; font-family: var(--font); }

input, select, textarea { font-family: var(--font); outline: none; border: none; }

ul, ol { list-style: none; }

img { max-width: 100%; }

h1,h2,h3,h4 { font-weight: 600; }



/* ─── 工具类 ──────────────────────────────────── */

.flex { display: flex; }

.flex-col { flex-direction: column; }

.items-center { align-items: center; }

.justify-between { justify-content: space-between; }

.justify-center { justify-content: center; }

.gap-1 { gap: 4px; }

.gap-2 { gap: 8px; }

.gap-3 { gap: 12px; }

.gap-4 { gap: 16px; }

.gap-6 { gap: 24px; }

.text-sm { font-size: 13px; }

.text-xs { font-size: 11px; }

.text-lg { font-size: 17px; }

.text-xl { font-size: 20px; }

.text-2xl { font-size: 24px; }

.text-3xl { font-size: 30px; }

.font-bold { font-weight: 700; }

.font-medium { font-weight: 500; }

.text-gray { color: var(--gray-500); }

.text-white { color: #fff; }

.text-primary { color: var(--primary); }

.text-success { color: var(--success); }

.text-danger { color: var(--danger); }

.w-full { width: 100%; }

.h-full { height: 100%; }

.rounded { border-radius: var(--radius); }

.rounded-full { border-radius: 9999px; }

.p-2 { padding: 8px; }

.p-3 { padding: 12px; }

.p-4 { padding: 16px; }

.p-6 { padding: 24px; }

.px-3 { padding-left: 12px; padding-right: 12px; }

.px-4 { padding-left: 16px; padding-right: 16px; }

.py-2 { padding-top: 8px; padding-bottom: 8px; }

.mb-2 { margin-bottom: 8px; }

.mb-3 { margin-bottom: 12px; }

.mb-4 { margin-bottom: 16px; }

.mb-6 { margin-bottom: 24px; }

.mt-2 { margin-top: 8px; }

.mt-4 { margin-top: 16px; }

.hidden { display: none !important; }

.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.transition { transition: all .2s; }

.overflow-hidden { overflow: hidden; }

.relative { position: relative; }

.absolute { position: absolute; }

.fixed { position: fixed; }

.grid { display: grid; }

.grid-cols-2 { grid-template-columns: 1fr 1fr; }

.grid-cols-3 { grid-template-columns: 1fr 1fr 1fr; }

.grid-cols-4 { grid-template-columns: 1fr 1fr 1fr 1fr; }



/* ─── 卡片 ────────────────────────────────────── */

.card {
  background: var(--card-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid rgba(255,255,255,.6);
  overflow: hidden;
  transition: box-shadow .25s, transform .25s;
}
.card:hover { box-shadow: var(--shadow-lg); }

.card-header {
  padding: 14px 20px;
  border-bottom: 1px solid rgba(59,130,246,.06);
  font-weight: 600;
  font-size: 15px;
  color: var(--gray-800);
  background: linear-gradient(90deg, rgba(59,130,246,.03), transparent);
}

.card-body { padding: 16px 20px; }



/* ─── 按钮 ────────────────────────────────────── */

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 6px; padding: 9px 22px; border-radius: 10px;
  font-size: 14px; font-weight: 500;
  transition: all .25s cubic-bezier(.4,0,.2,1);
  cursor: pointer; position: relative; overflow: hidden;
}
.btn::before {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(255,255,255,.15), transparent);
  pointer-events: none; border-radius: inherit;
}
.btn-primary {
  background: linear-gradient(135deg, #3B82F6, #2563EB);
  color: #fff;
  box-shadow: 0 1px 2px rgba(37,99,235,.15), 0 2px 8px rgba(59,130,246,.1);
}
.btn-primary:hover {
  background: linear-gradient(135deg, #2563EB, #1D4ED8);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(59,130,246,.25);
}
.btn-primary:active { transform: translateY(0); }
.btn-outline {
  background: rgba(255,255,255,.7);
  border: 1.5px solid rgba(59,130,246,.3);
  color: var(--primary);
}
.btn-outline:hover {
  background: var(--primary-light);
  border-color: var(--primary);
  box-shadow: 0 2px 8px rgba(59,130,246,.1);
}
.btn-success {
  background: linear-gradient(135deg, #10B981, #059669);
  color: #fff; box-shadow: 0 2px 8px rgba(16,185,129,.15);
}
.btn-success:hover { transform: translateY(-1px); box-shadow: 0 4px 12px rgba(16,185,129,.25); }
.btn-danger {
  background: linear-gradient(135deg, #EF4444, #DC2626);
  color: #fff; box-shadow: 0 2px 8px rgba(239,68,68,.12);
}
.btn-danger:hover { transform: translateY(-1px); box-shadow: 0 4px 12px rgba(239,68,68,.2); }
.btn-ai {
  background: linear-gradient(135deg, #6366F1, #8B5CF6);
  color: #fff; box-shadow: 0 2px 10px rgba(99,102,241,.18);
}
.btn-ai:hover {
  background: linear-gradient(135deg, #4F46E5, #7C3AED);
  transform: translateY(-1px); box-shadow: 0 4px 16px rgba(99,102,241,.3);
}
.btn-ai:disabled {
  background: var(--gray-200); color: var(--gray-400);
  transform: none; box-shadow: none; cursor: not-allowed;
}
.btn-ai-locked { background: linear-gradient(135deg,#9CA3AF,#6B7280); color: #fff; cursor: not-allowed; opacity: 0.7; }
.btn-ai-locked:hover { transform: none; box-shadow: none; }
.btn-ai-tooltip { position: relative; }
.btn-ai-tooltip::after {
  content: attr(data-tip); position: absolute; bottom: calc(100% + 8px); left: 50%; transform: translateX(-50%);
  background: var(--gray-800); color: #fff; font-size: 12px;
  padding: 6px 12px; border-radius: 8px; white-space: nowrap;
  opacity: 0; pointer-events: none; transition: opacity .2s; z-index: 100;
}
.btn-ai-tooltip:hover::after { opacity: 1; }
.btn-reformat {
  background: linear-gradient(135deg, #059669, #10B981);
  color: #fff; box-shadow: 0 2px 8px rgba(5,150,105,.15);
}
.btn-reformat:hover {
  background: linear-gradient(135deg, #047857, #059669);
  transform: translateY(-1px); box-shadow: 0 4px 12px rgba(5,150,105,.25);
}
.btn-reformat:disabled {
  background: var(--gray-200); color: var(--gray-400);
  transform: none; box-shadow: none; cursor: not-allowed;
}
.btn-reformat-done { background: linear-gradient(135deg, #059669, #10B981); color: #fff; opacity: 0.7; }
.btn-sm { padding: 6px 14px; font-size: 12px; border-radius: 8px; }
.btn-xs { padding: 4px 10px; font-size: 11px; border-radius: 7px; }
.btn-lg { padding: 13px 36px; font-size: 16px; border-radius: 12px; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-warning {
  background: linear-gradient(135deg, #F59E0B, #D97706);
  color: #fff; box-shadow: 0 2px 8px rgba(245,158,11,.15);
}
.btn-warning:hover {
  background: linear-gradient(135deg, #D97706, #B45309);
  transform: translateY(-1px);
}



/* ─── 表单 ────────────────────────────────────── */

.form-group { margin-bottom: 16px; }

.form-label { display: block; font-size: 13px; font-weight: 500; color: var(--gray-600); margin-bottom: 6px; }

.form-control {
  width: 100%; padding: 10px 14px;
  border: 1.5px solid var(--gray-200);
  border-radius: 10px; font-size: 14px;
  background: rgba(255,255,255,.8);
  transition: all .25s cubic-bezier(.4,0,.2,1); color: var(--gray-800);
}
.form-control:focus {
  border-color: var(--primary); background: #fff;
  box-shadow: 0 0 0 3px rgba(59,130,246,.08), 0 2px 8px rgba(59,130,246,.06);
}



/* ─── 徽章 ────────────────────────────────────── */

.badge {

  display: inline-flex; align-items: center; gap: 3px;

  padding: 2px 8px; border-radius: 20px; font-size: 11px; font-weight: 600;

}

.badge-primary { background: rgba(59,130,246,.08); color: #2563EB; }
.badge-success { background: rgba(16,185,129,.08); color: #059669; }
.badge-warning { background: rgba(245,158,11,.08); color: #D97706; }
.badge-danger { background: rgba(239,68,68,.08); color: #DC2626; }
.badge-info { background: rgba(14,165,233,.08); color: #0284C7; }
.badge-gray { background: rgba(100,116,139,.06); color: var(--gray-500); }



/* ─── 进度条 ──────────────────────────────────── */

.progress {
  height: 6px; background: rgba(59,130,246,.08); border-radius: 99px; overflow: hidden;
}
.progress-bar {
  height: 100%; border-radius: 99px;
  background: linear-gradient(90deg, #3B82F6, #6366F1, #8B5CF6);
  transition: width .6s cubic-bezier(.4,0,.2,1);
}



/* ─── 标签 ────────────────────────────────────── */

.tag {

  display: inline-flex; align-items: center; padding: 3px 10px;

  border-radius: 6px; font-size: 12px; font-weight: 500;

  background: var(--gray-100); color: var(--gray-600);

}



/* ─── 页面布局 ────────────────────────────────── */

#app { display: flex; min-height: 100vh; }



/* 侧边栏 */

.sidebar {
  width: var(--sidebar-w);
  position: fixed; top: 0; left: 0; bottom: 0;
  background: rgba(255,255,255,.88);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border-right: 1px solid rgba(59,130,246,.08);
  box-shadow: 1px 0 24px rgba(59,130,246,.04);
  display: flex; flex-direction: column;
  z-index: 100;
  transition: transform .3s cubic-bezier(.4,0,.2,1);
}
.sidebar-logo {
  padding: 18px 14px; border-bottom: 1px solid rgba(59,130,246,.06);
  display: flex; align-items: center; gap: 10px; flex-shrink: 0;
}
.sidebar-logo .logo-icon {
  width: 38px; height: 38px; border-radius: 10px;
  background: linear-gradient(135deg, #3B82F6, #6366F1);
  display: flex; align-items: center; justify-content: center;
  font-size: 19px; color: #fff; flex-shrink: 0;
  box-shadow: 0 2px 8px rgba(59,130,246,.2);
}
.sidebar-logo .logo-text { font-size: 13px; font-weight: 700; color: var(--gray-800); line-height: 1.3; }
.sidebar-logo .logo-sub { font-size: 11px; color: var(--gray-400); }
.sidebar-nav {
  flex: 1; padding: 10px 0;
  overflow-y: auto; overflow-x: hidden;
  min-height: 0; /* 允许 flex 子项收缩 */
}
.sidebar-nav::-webkit-scrollbar { width: 3px; }
.sidebar-nav::-webkit-scrollbar-track { background: transparent; }
.sidebar-nav::-webkit-scrollbar-thumb { background: rgba(59,130,246,.15); border-radius: 3px; }
.sidebar-nav::-webkit-scrollbar-thumb:hover { background: rgba(59,130,246,.3); }
.nav-section-title {
  padding: 8px 18px 4px; font-size: 10px; color: var(--gray-400);
  font-weight: 700; text-transform: uppercase; letter-spacing: .8px;
}
.nav-item {
  display: flex; align-items: center; gap: 10px; padding: 9px 14px;
  margin: 2px 8px; border-radius: 10px; cursor: pointer;
  transition: all .2s cubic-bezier(.4,0,.2,1);
  font-size: 13.5px; color: var(--gray-600); font-weight: 500;
  position: relative;
}
.nav-item:hover { background: rgba(59,130,246,.06); color: var(--primary); }
.nav-item.active {
  background: linear-gradient(135deg, rgba(59,130,246,.1), rgba(99,102,241,.08));
  color: var(--primary); font-weight: 600;
}
.nav-item.active::before {
  content: ''; position: absolute; left: 0; top: 50%; transform: translateY(-50%);
  width: 3px; height: 18px; border-radius: 0 3px 3px 0; background: var(--primary);
}
.nav-item .nav-icon { font-size: 17px; width: 22px; text-align: center; }
.sidebar-footer {
  padding: 12px 14px;
  border-top: 1px solid rgba(59,130,246,.06);
  flex-shrink: 0;
  margin-top: auto; /* 始终贴在底部 */
}
.user-card {
  display: flex; align-items: center; gap: 10px; padding: 9px 10px;
  border-radius: 10px; background: rgba(59,130,246,.04);
  cursor: pointer; transition: background .2s;
}
.user-card:hover { background: rgba(59,130,246,.08); }
.user-avatar {
  width: 34px; height: 34px; border-radius: 50%;
  background: linear-gradient(135deg, #3B82F6, #6366F1);
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-size: 15px; font-weight: 700; flex-shrink: 0;
  box-shadow: 0 2px 6px rgba(59,130,246,.2);
}
.user-info .user-name { font-size: 13px; font-weight: 600; color: var(--gray-800); }
.user-info .user-role { font-size: 11px; color: var(--gray-400); }



/* 主内容区 */

.main-wrapper { margin-left: var(--sidebar-w); flex: 1; display: flex; flex-direction: column; min-height: 100vh; }

.header {
  height: var(--header-h);
  background: rgba(255,255,255,.75);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(59,130,246,.06);
  padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between;
  position: sticky; top: 0; z-index: 50;
}
.header-title {
  font-size: 16px; font-weight: 700; color: var(--gray-800);
  display: flex; align-items: center; gap: 8px;
}
.header-title::before {
  content: ''; width: 4px; height: 18px; border-radius: 2px;
  background: linear-gradient(180deg, var(--primary), #6366F1);
}
.header-actions { display: flex; align-items: center; gap: 10px; }
#sidebar-toggle {
  display: none; align-items: center; justify-content: center;
  width: 36px; height: 36px; border-radius: 10px;
  background: rgba(59,130,246,.06); cursor: pointer;
  font-size: 20px; color: var(--gray-600); transition: all .2s;
}
#sidebar-toggle:hover { background: rgba(59,130,246,.12); }
.main-content { flex: 1; padding: 20px 24px; overflow-y: auto; }



/* ─── 页面视图 ────────────────────────────────── */

.page { display: none; animation: fadeIn .2s ease; }

.page.active { display: block; }

@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }



/* ─── 登录页 ──────────────────────────────────── */

#login-page {
  min-height: 100vh;
  min-height: 100dvh;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding: 28px 16px 0;
  box-sizing: border-box;
  background:
    linear-gradient(135deg, rgba(59,130,246,.85) 0%, rgba(99,102,241,.8) 50%, rgba(139,92,246,.75) 100%),
    repeating-linear-gradient(135deg, transparent, transparent 40px, rgba(255,255,255,.03) 40px, rgba(255,255,255,.03) 80px);
}
#login-page.active { display: flex; }
.login-card {
  flex: 0 0 auto;
  background: rgba(255,255,255,.95);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border-radius: 22px; padding: 40px; width: min(420px, 100%);
  border: 1px solid rgba(255,255,255,.5);
  box-shadow: 0 20px 60px rgba(0,0,0,.12), 0 0 0 1px rgba(59,130,246,.08);
  margin: auto 0;
}
#login-page .site-footer--login,
#login-page > .site-footer {
  flex-shrink: 0;
  width: 100%;
  margin-top: 28px;
  padding: 8px 16px max(24px, env(safe-area-inset-bottom));
  text-align: center;
  background: transparent;
  border: none;
  color: rgba(255,255,255,.92);
  font-size: 12px;
  line-height: 1.6;
}
#login-page .site-footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  color: #1e3a8a;
}
#login-page .site-footer-meta,
#login-page .site-footer-slogan {
  color: #334155;
  opacity: 0.9;
}

.login-logo { text-align: center; margin-bottom: 28px; }

.login-logo .icon { font-size: 56px; }

.login-logo h1 { font-size: 20px; color: var(--gray-800); margin-top: 8px; }

.login-logo p { font-size: 13px; color: var(--gray-400); }

.login-tabs { display: flex; background: var(--gray-100); border-radius: 10px; padding: 4px; margin-bottom: 24px; }

.login-tab {

  flex: 1; text-align: center; padding: 8px; border-radius: 7px;

  font-size: 14px; font-weight: 500; cursor: pointer; transition: all .2s; color: var(--gray-500);

}

.login-tab.active { background: #fff; color: var(--primary); box-shadow: 0 2px 8px rgba(0,0,0,.1); }



/* ─── 仪表盘 ──────────────────────────────────── */

.stat-cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 24px; }

.stat-card {
  background: rgba(255,255,255,.85); backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,.6);
  border-radius: var(--radius); padding: 18px;
  box-shadow: var(--shadow);
  display: flex; align-items: center; gap: 14px;
  transition: all .25s cubic-bezier(.4,0,.2,1);
}
.stat-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.stat-icon {
  width: 46px; height: 46px; border-radius: 12px;
  display: flex; align-items: center; justify-content: center; font-size: 21px;
}
.stat-icon.blue { background: linear-gradient(135deg, rgba(59,130,246,.1), rgba(99,102,241,.08)); }
.stat-icon.green { background: linear-gradient(135deg, rgba(16,185,129,.1), rgba(20,184,166,.08)); }
.stat-icon.orange { background: linear-gradient(135deg, rgba(245,158,11,.1), rgba(234,88,12,.08)); }
.stat-icon.purple { background: linear-gradient(135deg, rgba(139,92,246,.1), rgba(99,102,241,.08)); }
.stat-value { font-size: 22px; font-weight: 700; color: var(--gray-800); }
.stat-label { font-size: 12px; color: var(--gray-400); margin-top: 2px; }



/* ─── 学科卡片网格 ────────────────────────────── */

.subject-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }

.subject-card {

  border-radius: var(--radius); padding: 20px; cursor: pointer;

  color: #fff; position: relative; overflow: hidden; transition: transform .2s;

  box-shadow: var(--shadow);

}

.subject-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }

.subject-card::after {

  content: ''; position: absolute; right: -20px; top: -20px;

  width: 80px; height: 80px; border-radius: 50%;

  background: rgba(255,255,255,.1);

}

.subject-card .sub-icon { font-size: 32px; margin-bottom: 10px; }

.subject-card .sub-name { font-size: 16px; font-weight: 700; }

.subject-card .sub-progress { font-size: 12px; opacity: .85; margin-top: 4px; }

.subject-card .sub-chapters { font-size: 11px; opacity: .7; }



/* 学科颜色 */

.bg-math { background: linear-gradient(135deg, #3B82F6, #2563EB); }

.bg-chinese { background: linear-gradient(135deg, #EF4444, #DC2626); }

.bg-english { background: linear-gradient(135deg, #22C55E, #16A34A); }

.bg-physics { background: linear-gradient(135deg, #8B5CF6, #7C3AED); }

.bg-chemistry { background: linear-gradient(135deg, #F59E0B, #D97706); }

.bg-biology { background: linear-gradient(135deg, #10B981, #059669); }

.bg-history { background: linear-gradient(135deg, #B45309, #92400E); }

.bg-geography { background: linear-gradient(135deg, #0891B2, #0E7490); }

.bg-politics { background: linear-gradient(135deg, #475569, #334155); }



/* ─── 知识点页面 ──────────────────────────────── */


/* ═══════════════════════════════════════════════════════════ */
/* 知识点详情页面 UI 增强 v2026-06-27                         */
/* ═══════════════════════════════════════════════════════════ */

.kp-enhanced-card {
  background: #fff;
  border-radius: 16px;
  margin-bottom: 16px;
  overflow: hidden;
  transition: all .2s ease;
  border: 1px solid rgba(0,0,0,.04);
}
.kp-enhanced-card:hover {
  box-shadow: 0 8px 30px rgba(0,0,0,.08);
  transform: translateY(-2px);
}
.kp-banner {
  background: linear-gradient(135deg, #6366F1 0%, #8B5CF6 100%);
  color: #fff;
  padding: 28px 24px 20px;
  position: relative;
  overflow: hidden;
}
.kp-banner::before {
  content: '';
  position: absolute;
  top: -50%; right: -30%;
  width: 200px; height: 200px;
  background: rgba(255,255,255,.06);
  border-radius: 50%;
}
.kp-banner::after {
  content: '';
  position: absolute;
  bottom: -40%; left: -20%;
  width: 150px; height: 150px;
  background: rgba(255,255,255,.04);
  border-radius: 50%;
}
.kp-banner-content { position: relative; z-index: 1; }
.kp-banner-title {
  font-size: 24px;
  font-weight: 800;
  margin: 0 0 12px;
  line-height: 1.3;
  text-shadow: 0 2px 4px rgba(0,0,0,.1);
}
.kp-banner-subject {
  font-size: 13px;
  opacity: .9;
  margin-bottom: 10px;
  font-weight: 500;
}
.kp-banner-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.kp-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 700;
  background: rgba(255,255,255,.2);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255,255,255,.3);
  color: #fff;
}
.kp-badge.kp-badge-important { background: rgba(251,191,36,.9); border-color: rgba(251,191,36,.9); }
.kp-badge.kp-badge-exam { background: rgba(239,68,68,.9); border-color: rgba(239,68,68,.9); }
.kp-badge.kp-badge-reformatted { background: rgba(16,185,129,.92); border-color: rgba(16,185,129,.92); }
.kp-btn-reformat-done { background: linear-gradient(135deg, #059669, #10B981) !important; color: #fff !important; opacity: 0.92; }
.kp-content-section {
  padding: 20px 24px;
  border-bottom: 1px solid rgba(0,0,0,.04);
}
.kp-content-section:last-child { border-bottom: none; }
.kp-section-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 700;
  color: #1E293B;
  margin: 0 0 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid;
}
.kp-section-title.section-definition { border-color: #3B82F6; color: #3B82F6; }
.kp-section-title.section-formula { border-color: #8B5CF6; color: #8B5CF6; }
.kp-section-title.section-keypoint { border-color: #F59E0B; color: #F59E0B; }
.kp-section-title.section-application { border-color: #10B981; color: #10B981; }
.kp-section-title.section-mistake { border-color: #EF4444; color: #EF4444; }
.kp-section-title.section-summary { border-color: #6366F1; color: #6366F1; }
.kp-section-body {
  font-size: 14px;
  line-height: 1.9;
  color: #334155;
  padding: 12px 0;
}
.kp-section-body.md-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 14px 0;
  font-size: 13px;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 1px 3px rgba(0,0,0,.04);
}
.kp-section-body.md-content td,
.kp-section-body.md-content th {
  padding: 9px 12px;
  border: 1px solid var(--gray-200, #e2e8f0);
}
.kp-section-body.md-content th {
  background: linear-gradient(135deg, #EEF2FF, #E0E7FF);
  font-weight: 600;
  color: #1e293b;
}
.kp-section-body.md-content tr:nth-child(even) td { background: #FAFBFC; }
.kp-formula-block {
  background: linear-gradient(135deg, #F5F3FF, #EDE9FE);
  border: 1.5px solid #C4B5FD;
  border-radius: 12px;
  padding: 16px 20px;
  margin: 12px 0;
  text-align: center;
  font-size: 16px;
  font-weight: 600;
  color: #5B21B6;
  letter-spacing: 0.5px;
}
.kp-key-point {
  background: #FFFBEB;
  border-left: 3px solid #F59E0B;
  padding: 10px 14px;
  margin: 8px 0;
  border-radius: 0 8px 8px 0;
  font-size: 14px;
}
.kp-warning-box {
  background: linear-gradient(135deg, #FEF2F2, #FFF1F2);
  border: 1.5px solid #FCA5A5;
  border-radius: 12px;
  padding: 14px 18px;
  margin: 12px 0;
}
.kp-ai-summary-card {
  background: linear-gradient(135deg, #EFF6FF 0%, #F0FDF4 100%);
  border: 1.5px solid #93C5FD;
  border-radius: 16px;
  padding: 20px 24px;
  margin-bottom: 16px;
}
.kp-ai-summary-title {
  font-size: 14px;
  font-weight: 700;
  color: #3B82F6;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 6px;
}
.kp-ai-summary-body {
  font-size: 14px;
  line-height: 1.8;
  color: #475569;
}
.kp-exam-focus-card {
  background: linear-gradient(135deg, #FFFBEB 0%, #FEF3C7 100%);
  border: 1.5px solid #FCD34D;
  border-radius: 16px;
  padding: 18px 22px;
  margin-bottom: 16px;
}
.kp-exam-focus-title {
  font-size: 14px;
  font-weight: 700;
  color: #D97706;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 6px;
}
.kp-exam-focus-body {
  font-size: 14px;
  line-height: 1.8;
  color: #78350F;
}
.kp-example-item {
  background: #F8FAFC;
  border-radius: 10px;
  padding: 16px;
  margin-bottom: 12px;
  border: 1px solid #E2E8F0;
}
.kp-example-title {
  font-size: 14px;
  font-weight: 700;
  color: #475569;
  margin-bottom: 10px;
}
.kp-action-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid rgba(0,0,0,.06);
}
.kp-btn-practice {
  flex: 1;
  min-width: 120px;
  padding: 10px 16px;
  border: none;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: all .2s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}
.kp-btn-practice.kp-btn-primary {
  background: linear-gradient(135deg, #6366F1, #8B5CF6);
  color: #fff;
}
.kp-btn-practice.kp-btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(99,102,241,.35);
}
.kp-btn-practice.kp-btn-secondary {
  background: #F1F5F9;
  color: #475569;
}
.kp-btn-practice.kp-btn-secondary:hover {
  background: #E2E8F0;
}
/* AI 整理按钮 - 绿色 */
.kp-btn-practice.kp-btn-ai-green {
  background: linear-gradient(135deg, #10B981, #059669);
  color: #fff;
}
.kp-btn-practice.kp-btn-ai-green:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(16,185,129,.35);
}
.kp-back-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 8px 14px;
  background: #F1F5F9;
  border: none;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  color: #64748B;
  cursor: pointer;
  transition: all .15s;
  margin-bottom: 16px;
}
.kp-back-btn:hover {
  background: #E2E8F0;
  color: #334155;
}


/* ─── 知识学习：章节列表重设计 (v2026-06-24) ────────── */

/* 年级 Tab 导航栏 */
.grade-tab-bar {
  display: flex;
  gap: 0;
  background: var(--gray-100);
  border-radius: 10px;
  padding: 4px;
  margin-bottom: 16px;
}
.grade-tab {
  flex: 1;
  text-align: center;
  padding: 7px 10px;
  font-size: 13px;
  font-weight: 600;
  color: var(--gray-500);
  border-radius: 8px;
  cursor: pointer;
  transition: all .2s;
  white-space: nowrap;
}
.grade-tab.active {
  background: #fff;
  color: var(--primary);
  box-shadow: 0 2px 8px rgba(79,142,247,.18);
}
.grade-tab:hover:not(.active) { color: var(--gray-700); background: rgba(255,255,255,.5); }

/* 搜索框 */
.chapter-search-box {
  position: relative;
  margin-bottom: 16px;
}
.chapter-search-box input {
  width: 100%;
  padding: 9px 14px 9px 36px;
  border: 1.5px solid var(--gray-200);
  border-radius: 8px;
  font-size: 14px;
  background: var(--card-bg);
  transition: border-color .2s;
  color: var(--gray-700);
}
.chapter-search-box input:focus { border-color: var(--primary); outline: none; }
.chapter-search-box .search-icon {
  position: absolute;
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 15px;
  opacity: .5;
}

/* 学期折叠块 */
.semester-block {
  margin-bottom: 12px;
  border-radius: 12px;
  overflow: hidden;
  border: 1.5px solid var(--gray-200);
  background: var(--card-bg);
}
.semester-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  cursor: pointer;
  user-select: none;
  background: var(--gray-50);
  transition: background .15s;
}
.semester-header:hover { background: var(--primary-light); }
.semester-header .sem-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--gray-700);
  display: flex;
  align-items: center;
  gap: 8px;
}
.semester-header .sem-badge {
  font-size: 11px;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: 20px;
  padding: 2px 8px;
  font-weight: 600;
}
.semester-header .sem-arrow {
  font-size: 12px;
  color: var(--gray-400);
  transition: transform .25s;
}
.semester-header.open .sem-arrow { transform: rotate(90deg); }
.semester-body {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 10px;
  padding: 12px;
  border-top: 1px solid var(--gray-100);
}
.semester-body.collapsed { display: none; }

/* 章节卡片 */
.chapter-card {
  background: #fff;
  border-radius: 10px;
  padding: 14px 16px;
  cursor: pointer;
  border: 1.5px solid var(--gray-100);
  transition: all .2s;
  display: flex;
  flex-direction: column;
  gap: 6px;
  position: relative;
  overflow: hidden;
}
.chapter-card::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: var(--primary);
  opacity: 0;
  transition: opacity .2s;
}
.chapter-card:hover {
  border-color: var(--primary);
  box-shadow: 0 4px 16px rgba(79,142,247,.15);
  transform: translateY(-1px);
}
.chapter-card:hover::before { opacity: 1; }
.chapter-card .ch-order {
  font-size: 11px;
  color: var(--gray-400);
  font-weight: 500;
}
.chapter-card .ch-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--gray-800);
  line-height: 1.4;
  /* 最多显示2行 */
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.chapter-card .ch-desc {
  font-size: 11px;
  color: var(--gray-400);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.chapter-card .ch-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 4px;
}
.chapter-card .ch-kp-count {
  font-size: 11px;
  color: var(--primary);
  background: var(--primary-light);
  padding: 2px 7px;
  border-radius: 20px;
  font-weight: 600;
}
.chapter-card .ch-arrow {
  font-size: 13px;
  color: var(--gray-300);
}

/* 搜索无结果 */
.no-chapters-found {
  text-align: center;
  padding: 32px 16px;
  color: var(--gray-400);
  font-size: 14px;
}

/* 统计栏 */
.chapter-stats-bar {
  display: flex;
  gap: 16px;
  margin-bottom: 12px;
  font-size: 12px;
  color: var(--gray-500);
  flex-wrap: wrap;
}
.chapter-stats-bar span { display: flex; align-items: center; gap: 4px; }


.kp-list { display: flex; flex-direction: column; gap: 12px; }

.kp-item {

  background: var(--card-bg); border-radius: var(--radius); padding: 16px 20px;

  cursor: pointer; transition: all .2s; border: 1.5px solid transparent;

  box-shadow: var(--shadow);

}

.kp-item:hover { border-color: var(--primary); box-shadow: 0 4px 20px rgba(79,142,247,.15); }

.kp-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 6px; }

.kp-title { font-size: 15px; font-weight: 600; color: var(--gray-800); }

.kp-badges { display: flex; gap: 6px; flex-wrap: wrap; }

.kp-summary { font-size: 13px; color: var(--gray-500); line-height: 1.5; }

.kp-meta { display: flex; align-items: center; gap: 12px; margin-top: 8px; font-size: 12px; color: var(--gray-400); }



/* ─── 知识点详情 ──────────────────────────────── */

.kp-detail { max-width: 800px; }

.kp-content-box {

  background: var(--card-bg); border-radius: var(--radius); padding: 28px 24px;

  box-shadow: var(--shadow); margin-bottom: 20px;

  line-height: 1.85; font-size: 14px; color: var(--gray-700);

}

/* 知识要点结构化分区标题 */

.kp-content-box h2 {

  font-size: 17px; color: var(--gray-900); margin: 20px 0 10px;

  padding: 8px 0 6px; border-bottom: 2px solid var(--gray-200);

}

.kp-content-box h2:first-child { margin-top: 0; }

.kp-content-box h3 {

  font-size: 15px; color: var(--primary-dark); margin: 16px 0 8px;

  padding-left: 12px; border-left: 3px solid var(--primary);

}

.kp-content-box h4 { font-size: 14px; color: var(--gray-800); margin: 12px 0 6px; }

/* 表格增强 */

.kp-content-box table {

  width: 100%; border-collapse: collapse; margin: 14px 0; font-size: 13px;

  border-radius: 8px; overflow: hidden; box-shadow: 0 1px 3px rgba(0,0,0,.04);

}

.kp-content-box td, .kp-content-box th { padding: 9px 12px; border: 1px solid var(--gray-200); }

.kp-content-box th {

  background: linear-gradient(135deg, #EEF2FF, #E0E7FF);

  font-weight: 600; color: var(--gray-900); font-size: 12px; text-transform: none;

}

.kp-content-box tr:nth-child(even) td { background: #FAFBFC; }

.kp-content-box tr:hover td { background: #EEF2FF; transition: background .2s; }

.kp-content-box td:first-child, .kp-content-box th:first-child { font-weight: 600; color: var(--gray-800); }

/* 列表增强 */

.kp-content-box ul, .kp-content-box ol { padding-left: 20px; margin: 8px 0; }

.kp-content-box li { margin: 5px 0; }

.kp-content-box li::marker { color: var(--primary); font-weight: 600; }

/* 引用块增强 */

.kp-content-box blockquote {

  border-left: 3px solid var(--primary); padding: 10px 16px;

  background: var(--primary-light); border-radius: 0 8px 8px 0;

  margin: 14px 0; color: var(--gray-700); font-weight: 500;

}

.kp-content-box code { background: var(--gray-100); padding: 2px 6px; border-radius: 4px; font-size: 13px; color: #E11D48; }

.kp-content-box pre { background: #1E293B; color: #e2e8f0; padding: 14px 16px; border-radius: 8px; overflow-x: auto; font-size: 13px; }

.kp-content-box pre code { background: none; padding: 0; color: #e2e8f0; }

.kp-content-box strong { color: var(--gray-900); }

/* 分区视觉分隔 */

.kp-content-box h3 + p, .kp-content-box h3 + ul { margin-top: 4px; }

.kp-content-box hr { border: none; border-top: 1px dashed var(--gray-200); margin: 16px 0; }



/* 例题卡片 */

.example-card {

  background: linear-gradient(135deg, #F0F7FF, #EBF4FF);

  border: 1.5px solid #BFDBFE; border-radius: var(--radius); padding: 20px;

  margin-bottom: 16px;

}

.example-title { font-size: 14px; font-weight: 700; color: var(--primary); margin-bottom: 12px; }

.example-content { font-size: 14px; color: var(--gray-700); background: #fff; border-radius: 8px; padding: 14px; margin-bottom: 12px; line-height: 1.8; }

.example-answer { display: none; }

.example-answer.show { display: block; }

.example-answer .answer-box {

  background: #F0FFF4; border: 1.5px solid #86EFAC; border-radius: 8px;

  padding: 14px; font-size: 13px; line-height: 1.8; color: var(--gray-700);

}



/* ─── 练习/考试页面 ───────────────────────────── */

.quiz-header {

  background: var(--card-bg); border-radius: var(--radius); padding: 16px 20px;

  box-shadow: var(--shadow); margin-bottom: 20px;

  display: flex; align-items: center; justify-content: space-between;

}



/* ─── 试卷学科分组列表 ──────────────────────── */

.subject-group { margin-bottom: 28px; }

.subject-group-header {

  display: flex; align-items: center; gap: 10px;

  padding: 10px 0; margin-bottom: 12px;

  border-bottom: 2px solid var(--gray-100);

}

.subject-group-icon { font-size: 24px; }

.subject-group-title { font-size: 17px; font-weight: 700; color: var(--gray-800); }

.subject-group-count {

  font-size: 13px; color: var(--gray-400); font-weight: 400;

  margin-left: 4px;

}

.paper-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 14px; }

.paper-card {

  background: var(--card-bg); border-radius: var(--radius);

  box-shadow: var(--shadow); overflow: hidden;

  transition: transform 0.2s, box-shadow 0.2s;

  cursor: pointer; border: 1.5px solid var(--gray-100);

}

.paper-card:hover { transform: translateY(-2px); box-shadow: 0 8px 25px rgba(0,0,0,0.1); border-color: var(--primary); }

.paper-card-body { padding: 18px; }

.paper-card-title { font-size: 15px; font-weight: 700; color: var(--gray-800); margin-bottom: 8px; }

.paper-card-meta { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 10px; }

.paper-card-footer {

  display: flex; align-items: center; justify-content: space-between;

  padding: 10px 18px; background: var(--gray-50);

  border-top: 1px solid var(--gray-100);

}

.paper-card-footer .btn-sm { padding: 6px 16px; font-size: 13px; }

.paper-delete-btn {

  color: var(--danger); font-size: 13px; cursor: pointer;

  padding: 4px 10px; border-radius: 6px; border: 1px solid transparent;

  background: none; transition: all 0.15s;

}

.paper-delete-btn:hover { background: #FFF1F2; border-color: #FECACA; }

.quiz-timer { font-size: 22px; font-weight: 700; color: var(--primary); }

.question-card {
  background: rgba(255,255,255,.88); backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,.6);
  border-radius: var(--radius); padding: 24px;
  box-shadow: var(--shadow); margin-bottom: 16px;
  transition: box-shadow .25s;
}
.question-card:hover { box-shadow: var(--shadow-lg); }

.question-header { display: flex; align-items: flex-start; gap: 12px; margin-bottom: 16px; }

.question-num {

  width: 28px; height: 28px; border-radius: 50%;

  background: var(--primary); color: #fff; display: flex; align-items: center;

  justify-content: center; font-size: 12px; font-weight: 700; flex-shrink: 0; margin-top: 2px;

}

.question-text { font-size: 15px; color: var(--gray-800); line-height: 1.7; }

.options-list { display: flex; flex-direction: column; gap: 10px; }

.option-item {
  display: flex; align-items: center; gap: 10px; padding: 11px 16px;
  border: 1.5px solid rgba(59,130,246,.12); border-radius: 10px; cursor: pointer;
  transition: all .2s cubic-bezier(.4,0,.2,1); font-size: 14px;
  background: rgba(255,255,255,.6);
}
.option-item:hover { border-color: var(--primary); background: rgba(59,130,246,.04); }
.option-item.selected {
  border-color: var(--primary);
  background: linear-gradient(135deg, rgba(59,130,246,.06), rgba(99,102,241,.04));
  color: var(--primary); font-weight: 600;
}
.option-item.correct { border-color: var(--success); background: rgba(16,185,129,.06); color: #059669; }
.option-item.wrong { border-color: var(--danger); background: rgba(239,68,68,.04); color: #DC2626; }

.option-key {

  width: 24px; height: 24px; border-radius: 50%; border: 1.5px solid currentColor;

  display: flex; align-items: center; justify-content: center;

  font-size: 12px; font-weight: 700; flex-shrink: 0;

}

.fill-input { width: 100%; border: 1.5px solid var(--gray-200); border-radius: 8px; padding: 10px 14px; font-size: 14px; background: var(--gray-50); }

.fill-input:focus { border-color: var(--primary); background: #fff; }

/* 填空题内联输入样式 */

.fill-input-row { display: flex; align-items: center; gap: 8px; margin-top: 12px; padding: 10px 14px; background: rgba(255,255,255,.7); border-radius: 10px; border: 1.5px solid rgba(59,130,246,.12); }

.fill-prefix { font-size: 14px; color: var(--gray-500); white-space: nowrap; font-weight: 600; }

.fill-inline-input { flex: 1; border: none; border-bottom: 2px solid var(--primary); background: transparent; font-size: 15px; padding: 4px 6px; outline: none; color: var(--gray-800); min-width: 120px; }

.fill-inline-input:focus { border-bottom-color: #4f46e5; background: rgba(99,102,241,.05); border-radius: 4px 4px 0 0; }

.fill-inline-blank { display: inline-block; min-width: 72px; max-width: 160px; border: none; border-bottom: 2px solid var(--primary); background: rgba(99,102,241,.06); font-size: 15px; padding: 2px 6px; margin: 0 4px; vertical-align: baseline; outline: none; color: var(--gray-800); border-radius: 4px 4px 0 0; }

.fill-inline-blank:focus { border-bottom-color: #4f46e5; background: rgba(99,102,241,.12); }

.fill-blank-slot { display: inline-block; min-width: 64px; border-bottom: 2px solid var(--gray-400); color: var(--gray-500); margin: 0 4px; vertical-align: baseline; letter-spacing: 2px; }

.fill-blank-filled { display: inline-block; min-width: 48px; padding: 0 6px; margin: 0 4px; border-bottom: 2px solid var(--primary); font-weight: 600; color: var(--gray-800); vertical-align: baseline; }

.question-figure-img { max-height: 2.4em; vertical-align: middle; margin: 0 3px; border-radius: 4px; }

.question-detail-body .question-figure-img,
.review-rendered .question-figure-img { max-height: 2.2em; }

.question-detail-body img { max-height: 3.2em; }
.review-rendered img { max-height: 2.8em; }

.fill-textarea { width: 100%; border: 1.5px solid var(--gray-200); border-radius: 8px; padding: 10px 14px; font-size: 14px; background: var(--gray-50); resize: vertical; font-family: inherit; }

/* 填空题解析中的答案展示 */

.fill-answer-row { display: flex; align-items: center; flex-wrap: wrap; gap: 6px; margin-top: 12px; padding: 10px 14px; background: var(--gray-50); border-radius: 8px; font-size: 14px; }

.fill-label { color: var(--gray-500); font-weight: 600; }

.fill-user-ans { font-weight: 700; padding: 2px 8px; border-radius: 6px; }

.fill-correct { color: #16a34a; background: #dcfce7; }

.fill-wrong { color: #dc2626; background: #fee2e2; }

.fill-ref-ans { color: var(--primary); font-weight: 700; padding: 2px 8px; background: #ede9fe; border-radius: 6px; }

.solution-box {
  background: rgba(255,249,230,.8); border: 1.5px solid rgba(253,230,138,.6); border-radius: 10px;
  padding: 14px; margin-top: 14px; font-size: 13px; line-height: 1.8; color: var(--gray-700);
  display: none;
}

.solution-box.show { display: block; }

.solution-box strong { color: var(--gray-900); }



/* ─── 错题集 ──────────────────────────────────── */

.wrong-card {

  background: var(--card-bg); border-radius: var(--radius); box-shadow: var(--shadow);

  overflow: hidden; margin-bottom: 16px;

}

.wrong-card-header { background: #FFF1F2; padding: 14px 20px; border-bottom: 1px solid #FEE2E2; }

.wrong-card-header .wrong-subject { font-size: 12px; color: #DC2626; font-weight: 600; }

.wrong-card-header .wrong-chapter { font-size: 13px; color: var(--gray-700); font-weight: 500; }

.wrong-card-body { padding: 16px 20px; }

.wrong-question { font-size: 14px; color: var(--gray-800); margin-bottom: 14px; line-height: 1.7; }

.analysis-section { margin-bottom: 12px; }

.analysis-label { font-size: 12px; font-weight: 700; color: var(--primary); margin-bottom: 4px; }

.analysis-content { font-size: 13px; color: var(--gray-600); line-height: 1.7; background: var(--gray-50); padding: 10px 12px; border-radius: 7px; }



/* ─── 学情报告 ────────────────────────────────── */

.report-card { background: var(--card-bg); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); margin-bottom: 20px; }

.report-title { font-size: 17px; font-weight: 700; color: var(--gray-800); margin-bottom: 16px; }

.metric-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 12px; }

.metric-item { text-align: center; padding: 16px 8px; background: var(--gray-50); border-radius: 10px; }

.metric-value { font-size: 28px; font-weight: 700; color: var(--primary); }

.metric-label { font-size: 12px; color: var(--gray-400); margin-top: 4px; }

.weak-point-list { display: flex; flex-wrap: wrap; gap: 8px; }

.weak-point-tag { padding: 5px 12px; background: #FFF1F2; color: #DC2626; border-radius: 6px; font-size: 12px; font-weight: 500; }



/* ─── 思维导图 ────────────────────────────────── */

#mindmap-canvas { width: 100%; height: 500px; background: var(--card-bg); border-radius: var(--radius); box-shadow: var(--shadow); overflow: auto; position: relative; }

.mindmap-node {

  position: absolute; background: var(--primary-light); border: 2px solid var(--primary);

  border-radius: 8px; padding: 8px 14px; font-size: 13px; font-weight: 500;

  color: var(--primary); cursor: pointer; transition: all .2s; white-space: nowrap;

}

.mindmap-node:hover { background: var(--primary); color: #fff; transform: scale(1.05); }

.mindmap-node.root { background: var(--primary); color: #fff; font-size: 15px; font-weight: 700; }

.mindmap-node.child { background: #F0FFF4; border-color: var(--success); color: #16A34A; }



/* ─── 积分与勋章 ──────────────────────────────── */

.achievement-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 16px; }

.achievement-item {

  text-align: center; padding: 20px 16px; background: var(--card-bg);

  border-radius: var(--radius); box-shadow: var(--shadow); cursor: pointer;

  transition: transform .2s;

}

.achievement-item:hover { transform: translateY(-3px); }

.achievement-icon { font-size: 36px; margin-bottom: 8px; }

.achievement-name { font-size: 13px; font-weight: 600; color: var(--gray-700); }

.achievement-desc { font-size: 11px; color: var(--gray-400); margin-top: 3px; }

.achievement-item.locked { opacity: .4; filter: grayscale(1); }



/* ─── 后台管理 ────────────────────────────────── */

.admin-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.admin-table th {
  background: linear-gradient(90deg, rgba(59,130,246,.04), transparent);
  padding: 10px 14px; text-align: left; font-weight: 600;
  color: var(--gray-600); border-bottom: 1.5px solid rgba(59,130,246,.08);
}
.admin-table td { padding: 10px 14px; border-bottom: 1px solid var(--gray-100); color: var(--gray-700); }
.admin-table tr:hover td { background: rgba(59,130,246,.03); }



/* ─── 试卷上传面板 ───────────────────────────── */

.upload-dropzone {

  border: 2px dashed var(--gray-200);

  border-radius: 12px; padding: 24px;

  text-align: center; cursor: pointer;

  transition: border-color 0.2s, background 0.2s;

}

.upload-dropzone:hover { border-color: var(--primary); background: #F0F4FF; }

.upload-dropzone.drag-over { border-color: var(--primary); background: #EEF2FF; }

.upload-progress-bar {

  background: var(--gray-100); border-radius: 4px;

  height: 6px; overflow: hidden;

}

.upload-progress-fill {

  height: 100%; border-radius: 4px;

  transition: width 0.5s;

  background: linear-gradient(90deg, #6366F1, #818CF8);

}



/* ─── 加载 & 空状态 ───────────────────────────── */

.loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 48px 20px;
}
.loading p { color: var(--gray-400); font-size: 14px; margin: 0; }

.spinner { width: 32px; height: 32px; border: 3px solid var(--gray-200); border-top-color: var(--primary); border-radius: 50%; animation: spin .8s linear infinite; }

@keyframes spin { to { transform: rotate(360deg); } }

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 40px 20px;
  color: var(--gray-500);
}

.empty-state .empty-icon { font-size: 48px; margin-bottom: 10px; line-height: 1; }

.empty-state p { color: var(--gray-400); font-size: 14px; margin: 0 0 12px; }

.empty-state--error .empty-icon { font-size: 40px; }

.empty-state--compact { padding: 20px 12px; }

.empty-state--compact .empty-icon { font-size: 32px; margin-bottom: 6px; }

.skeleton {
  background: linear-gradient(90deg, var(--gray-100) 25%, var(--gray-50) 50%, var(--gray-100) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.2s ease-in-out infinite;
  border-radius: 8px;
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.dash-stat.is-loading .stat-value { color: var(--gray-300); }

.dash-recent-item--clickable {
  cursor: pointer;
  transition: background 0.15s;
  border-radius: 8px;
  margin: 0 -8px;
  padding-left: 8px;
  padding-right: 8px;
}

.dash-recent-item--clickable:hover { background: var(--gray-50); }



/* ─── Toast提示 ───────────────────────────────── */

.toast-container { position: fixed; top: 20px; right: 20px; z-index: 9999; display: flex; flex-direction: column; gap: 8px; }
.toast {
  padding: 12px 20px; border-radius: 12px; font-size: 14px; font-weight: 500;
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 4px 24px rgba(0,0,0,.1); animation: slideIn .3s ease;
  display: flex; align-items: center; gap: 8px; min-width: 200px;
}
.toast.success { background: rgba(240,255,244,.92); color: #059669; border: 1px solid rgba(134,239,172,.5); }
.toast.error { background: rgba(255,241,242,.92); color: #DC2626; border: 1px solid rgba(252,165,165,.5); }
.toast.info { background: rgba(239,246,255,.92); color: #2563EB; border: 1px solid rgba(191,219,254,.5); }

@keyframes slideIn { from { opacity:0; transform: translateX(20px); } to { opacity:1; transform: translateX(0); } }



/* ─── 弹窗 ──────────────────────────────────── */

.modal-overlay {

  position: fixed; top: 0; left: 0; right: 0; bottom: 0;

  background: rgba(0,0,0,.4); z-index: 9998;

  display: flex; align-items: center; justify-content: center;

  animation: fadeIn .2s ease;

}

.modal-box {

  background: #fff; border-radius: 16px;

  box-shadow: 0 20px 60px rgba(0,0,0,.2);

  width: 90%;

  animation: scaleIn .2s ease;

}

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

@keyframes scaleIn { from { opacity: 0; transform: scale(.95); } to { opacity: 1; transform: scale(1); } }



/* ─── 响应式：整页 zoom 缩放 + 侧边栏自适应 ──────────── */

/*

 * 核心策略：用 JS 动态设置 html { zoom } 实现整页等比缩放

 * 基准宽度 1440px（参见下方 applyPageZoom 函数）

 * 下面的 @media 仅作为 zoom 无法覆盖的细节补充

 */

/* 超宽屏幕（>=1400px）：侧边栏适当加宽，更好地利用屏幕空间 */

@media (min-width: 1400px) {

  :root { --sidebar-w: 280px; }

  .sidebar-logo .logo-text { font-size: 14px; }

  .nav-item { padding: 12px 20px; }

}

/* 宽屏笔记本（1025px-1399px）：侧边栏略加宽 */

@media (min-width: 1025px) and (max-width: 1399px) {

  :root { --sidebar-w: 250px; }

}

/* 平板横屏/小屏幕笔记本 1024px以下 */

@media (max-width: 1024px) {

  :root { --sidebar-w: 200px; }

  .main-content { padding: 16px; }

  .stat-cards { grid-template-columns: repeat(2, 1fr); }

  .subject-grid { grid-template-columns: repeat(2, 1fr); }

  .metric-grid { grid-template-columns: repeat(2, 1fr); }

  .achievement-grid { grid-template-columns: repeat(2, 1fr); }

  .header-title { font-size: 15px; }

}



/* 平板竖屏 768px以下 */

@media (max-width: 768px) {

  .sidebar { transform: translateX(-100%); width: 240px; }

  .sidebar.open { transform: translateX(0); }

  .main-content { padding: 14px; }

  .stat-cards { grid-template-columns: 1fr 1fr; }

  .subject-grid { grid-template-columns: 1fr; }

  .achievement-grid { grid-template-columns: repeat(2, 1fr); }

  #login-page .login-card { width: 94%; padding: 28px 20px; }

  #header-quote { display: none !important; }

  #sidebar-toggle { display: flex !important; }

}



/* 大屏手机 480px以下 */

@media (max-width: 480px) {

  :root { --sidebar-w: 240px; }

  .main-content { padding: 10px; }

  .stat-cards { grid-template-columns: 1fr; }

  .metric-grid { grid-template-columns: 1fr; }

  .achievement-grid { grid-template-columns: 1fr; }

  .paper-cards { grid-template-columns: 1fr; }

  .header { padding: 0 12px; }

  .header-title { font-size: 14px; }

  .btn { padding: 6px 14px; font-size: 13px; }

  #login-page .login-card { padding: 20px 16px; }

  #login-page .login-logo h1 { font-size: 18px; }

}



/* 侧边栏遮罩层 */

.sidebar-overlay {

  position: fixed; top: 0; left: 0; right: 0; bottom: 0;

  background: rgba(0,0,0,0.4); z-index: 99; display: none;

}



/* 滚动条美化 */

::-webkit-scrollbar { width: 6px; height: 6px; }

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

::-webkit-scrollbar-thumb { background: var(--gray-300); border-radius: 3px; }

::-webkit-scrollbar-thumb:hover { background: var(--gray-400); }



/* 防沉迷提示 */

.anti-addiction-bar {

  background: #FFF9C4; border-bottom: 1px solid #FDE68A; padding: 6px 24px;

  font-size: 12px; color: #92400E; display: flex; align-items: center; gap: 6px;

}

/* AI 图片占位框 */

.img-placeholder-box {

  display: flex; align-items: center; gap: 10px;

  background: #F0F9FF; border: 1px dashed #0EA5E9;

  border-radius: 8px; padding: 10px 14px; margin: 8px 0;

  font-size: 13px; color: #0C4A6E;

}

.img-placeholder-icon { font-size: 24px; flex-shrink: 0; }

.img-placeholder-desc { line-height: 1.5; }

.img-placeholder-tip {

  display: inline-flex; align-items: center; gap: 4px;

  background: #FFF7ED; color: #9A3412; font-size: 12px; font-weight: 500;

  padding: 3px 10px; border-radius: 6px; border: 1px solid #FED7AA;

  margin: 2px 2px;

}

/* Markdown 内容中的真实图片 */

.md-content img, .kp-content-box img {

  max-width: 100%; height: auto; border-radius: 8px;

  margin: 8px 0; box-shadow: 0 1px 3px rgba(0,0,0,0.1);

}


/* ══════════════════════════════════════════════════════════
   v2026-06-18 UI现代化增强：触摸优化 + 表格滚动 + 暗色适配
   ══════════════════════════════════════════════════════════ */

/* 移动端按钮触摸优化 */
@media (max-width: 768px) {
  .btn, button, [role="button"], .nav-link, .tab-btn {
    min-height: 44px;
    min-width: 44px;
    touch-action: manipulation;
  }
  input, select, textarea {
    font-size: 16px !important;
    min-height: 40px;
  }
  table, .data-table {
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  .card { padding: 14px; }
  .modal-content, .dialog-content {
    width: 95vw !important;
    max-width: 95vw !important;
    margin: 10px auto;
    border-radius: 12px;
  }
}

/* 平滑过渡增强 */
.card, .stat-card, .btn, .tab-btn {
  transition: all 0.2s ease;
}
.card:hover { box-shadow: 0 4px 12px rgba(0,0,0,0.08); }
.btn:active { transform: scale(0.97); }

/* Toast/Notification 动画 */
@keyframes slideInDown {
  from { transform: translateY(-100%); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}
@keyframes slideOutUp {
  from { transform: translateY(0); opacity: 1; }
  to { transform: translateY(-100%); opacity: 0; }
}

/* 表格斑马纹 */
table.striped tbody tr:nth-child(even) { background: rgba(0,0,0,0.02); }

/* 无障碍焦点指示器 */
:focus-visible {
  outline: 2px solid var(--accent, #3B82F6);
  outline-offset: 2px;
}

/* 打印优化 */
@media print {
  .sidebar, .header, .mobile-nav, .btn, #sidebar-toggle { display: none !important; }
  .main-wrapper { margin-left: 0 !important; }
  .main-content { padding: 0 !important; }
  body { font-size: 12pt; color: #000; background: #fff; }
  .card { box-shadow: none; border: 1px solid #ddd; break-inside: avoid; }
}

/* ─── 响应式侧边栏 & 布局适配 ─────────────── */

/* 大屏（>=1440px）：宽侧边栏 */
@media (min-width: 1440px) {
  :root { --sidebar-w: 248px; }
  .main-content { padding: 24px 32px; }
  .stat-cards { grid-template-columns: repeat(4, 1fr); gap: 20px; }
}

/* 中屏（1024-1439px）：标准侧边栏 */
@media (min-width: 1024px) and (max-width: 1439px) {
  :root { --sidebar-w: 220px; }
  .main-content { padding: 20px 24px; }
}

/* 平板（768-1023px）：抽屉侧边栏 + 汉堡菜单 */
@media (max-width: 1023px) {
  :root { --sidebar-w: 260px; }
  .sidebar { transform: translateX(-100%); z-index: 200; }
  .sidebar.open { transform: translateX(0); box-shadow: 4px 0 24px rgba(0,0,0,.1); }
  #sidebar-toggle { display: flex !important; }
  .main-wrapper { margin-left: 0; }
  .stat-cards { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .main-content { padding: 16px 20px; }
  .header { padding: 0 16px; }
}

@media (min-width: 900px) and (max-width: 1023px) {
  .subject-grid { grid-template-columns: repeat(2, 1fr); }
}

/* 手机（<768px）：全宽覆盖侧边栏 */
@media (max-width: 767px) {
  :root { --sidebar-w: 85vw; }
  .sidebar { transform: translateX(-100%); z-index: 200; }
  .sidebar.open { transform: translateX(0); }
  #sidebar-toggle { display: flex !important; }
  .main-wrapper { margin-left: 0; }
  .stat-cards { grid-template-columns: 1fr 1fr; gap: 10px; }
  .stat-card { padding: 14px; }
  .stat-icon { width: 40px; height: 40px; font-size: 18px; }
  .stat-value { font-size: 20px; }
  .subject-grid { grid-template-columns: 1fr; }
  .main-content { padding: 12px 14px; }
  .header { padding: 0 12px; }
  .card-body { padding: 12px 14px; }
  .card-header { padding: 12px 14px; }
  .login-card { width: 92vw; padding: 28px 24px; margin: 0 12px; }
  .login-logo .icon { font-size: 44px; }
  .login-logo h1 { font-size: 17px; }
}

/* 超小屏手机（<400px） */
@media (max-width: 399px) {
  :root { --sidebar-w: 90vw; }
  .stat-cards { grid-template-columns: 1fr; }
  .header-title { font-size: 14px; }
}

/* ─── 知识学习增强（章内分组 / 阅读模式 / 进度） ─── */
.kp-breadcrumb { font-size: 12px; color: var(--gray-500); flex: 1; min-width: 0; }
.kp-breadcrumb span { color: var(--gray-400); margin: 0 4px; }
.kp-chapter-toolbar {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: 12px; margin-bottom: 16px; padding: 12px 16px;
  background: var(--gray-50); border-radius: var(--radius); border: 1px solid var(--gray-100);
}
.kp-view-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.kp-chapter-progress-wrap { flex: 1; min-width: 160px; max-width: 280px; }
.kp-progress-label { font-size: 12px; color: var(--gray-600); display: block; margin-bottom: 4px; }
.kp-progress-bar { height: 6px; background: var(--gray-200); border-radius: 99px; overflow: hidden; }
.kp-progress-fill { height: 100%; background: linear-gradient(90deg, #4F8EF7, #6366F1); border-radius: 99px; transition: width .35s ease; }
.chapter-card .ch-progress-ring {
  font-size: 11px; color: var(--primary); background: #EEF2FF; padding: 2px 8px; border-radius: 99px;
}
.chapter-card .ch-new-badge {
  font-size: 11px; color: #B45309; background: #FEF3C7; padding: 2px 8px; border-radius: 99px; margin-left: 6px;
}
.kp-section-group { margin-bottom: 12px; border: 1px solid var(--gray-100); border-radius: var(--radius); overflow: hidden; background: var(--card-bg); }
.kp-section-header {
  padding: 12px 16px; font-weight: 600; font-size: 14px; color: var(--gray-800);
  background: var(--gray-50); cursor: pointer; display: flex; align-items: center; justify-content: space-between;
}
.kp-section-header.open .kp-section-arrow { transform: rotate(90deg); }
.kp-section-arrow { transition: transform .2s; color: var(--gray-400); }
.kp-section-body-items { padding: 8px; display: flex; flex-direction: column; gap: 8px; }
.kp-section-body-items.collapsed { display: none; }
.kp-item.kp-read { border-left: 3px solid #10B981; }
.kp-item .kp-read-mark { font-size: 11px; color: #059669; }
.chapter-reader-layout {
  display: grid; grid-template-columns: 260px 1fr; gap: 16px; min-height: 480px;
  border: 1px solid var(--gray-100); border-radius: var(--radius); overflow: hidden; background: var(--card-bg);
}
.chapter-reader-toc {
  border-right: 1px solid var(--gray-100); background: var(--gray-50); overflow-y: auto; max-height: 72vh; padding: 8px 0;
}
.chapter-reader-toc .toc-section { padding: 8px 12px 4px; font-size: 11px; font-weight: 700; color: var(--gray-500); text-transform: uppercase; }
.chapter-reader-toc .toc-item {
  display: block; width: 100%; text-align: left; padding: 8px 16px; font-size: 13px; color: var(--gray-700);
  background: none; border: none; cursor: pointer; border-left: 3px solid transparent;
  transition: background .15s ease, color .15s ease, border-color .15s ease;
}
.chapter-reader-toc .toc-item:hover { background: #EEF2FF; color: var(--primary); }
.chapter-reader-toc .toc-item.active { background: #EEF2FF; border-left-color: var(--primary); color: var(--primary); font-weight: 600; }
.chapter-reader-toc .toc-item.toc-read::after { content: ' ✓'; color: #059669; font-size: 11px; }
.chapter-reader-toc .toc-item.toc-parent { font-weight: 600; color: var(--gray-800); }
.chapter-reader-main { overflow-y: auto; max-height: 72vh; padding: 20px 24px; }
.chapter-reader-placeholder { color: var(--gray-400); text-align: center; padding: 80px 20px; }
.kp-nav-pair { display: flex; gap: 8px; }
.kp-nav-btn { font-size: 12px; padding: 6px 12px; }
@media (max-width: 768px) {
  .chapter-reader-layout { grid-template-columns: 1fr; }
  .chapter-reader-toc { max-height: 200px; border-right: none; border-bottom: 1px solid var(--gray-100); }
}