/* ===== 西城分班数学 · 移动优先样式 ===== */
* { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
:root {
  --primary: #4F6EF7;
  --primary-light: #E8EDFF;
  --success: #52C41A;
  --danger: #F5222D;
  --warning: #FA8C16;
  --text: #1F2329;
  --text-sub: #8A8F99;
  --bg: #F5F6FA;
  --card: #FFFFFF;
  --radius: 14px;
}
html, body { height: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.6;
  -webkit-user-select: none;
  user-select: none;
}
#app { max-width: 480px; margin: 0 auto; min-height: 100vh; display: flex; flex-direction: column; }

/* ===== 顶栏 ===== */
#app-header {
  position: sticky; top: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  height: 52px; padding: 0 12px;
  background: var(--card); border-bottom: 1px solid #EEE;
}
.header-title { font-size: 17px; font-weight: 700; color: var(--primary); letter-spacing: 0.5px; }
.header-btn { width: 36px; height: 36px; font-size: 26px; line-height: 30px; color: var(--text-sub); background: none; border: none; border-radius: 8px; }
.header-btn:active { background: #F0F0F0; }
.header-spacer { visibility: hidden; }

/* ===== 主视图 ===== */
#view { flex: 1; padding: 14px 14px 76px; overflow-x: hidden; }
.page { animation: fadeIn .25s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

/* ===== 底部导航 ===== */
#tabbar {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 100;
  max-width: 480px; margin: 0 auto;
  display: flex; background: var(--card); border-top: 1px solid #EEE;
  padding-bottom: env(safe-area-inset-bottom);
}
.tab-item { flex: 1; display: flex; flex-direction: column; align-items: center; padding: 7px 0 6px; color: var(--text-sub); font-size: 11px; cursor: pointer; }
.tab-item.active { color: var(--primary); }
.tab-icon { font-size: 21px; line-height: 1.2; }

/* ===== 通用组件 ===== */
.card { background: var(--card); border-radius: var(--radius); padding: 16px; margin-bottom: 12px; box-shadow: 0 1px 3px rgba(0,0,0,.04); }
.card-title { font-size: 16px; font-weight: 700; margin-bottom: 10px; display: flex; align-items: center; gap: 6px; }
.card-title .badge { font-size: 11px; color: var(--text-sub); font-weight: 400; }
.btn {
  display: block; width: 100%; padding: 13px; border: none; border-radius: 12px;
  font-size: 16px; font-weight: 600; text-align: center; cursor: pointer;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:active { opacity: .85; }
.btn-success { background: var(--success); color: #fff; }
.btn-outline { background: var(--card); color: var(--primary); border: 1.5px solid var(--primary); }
.btn:disabled { opacity: .45; }
.btn + .btn { margin-top: 10px; }
.text-sub { color: var(--text-sub); font-size: 13px; }
.mt8 { margin-top: 8px; } .mt12 { margin-top: 12px; } .mt16 { margin-top: 16px; }
.center { text-align: center; }
.tag { display: inline-block; padding: 2px 9px; border-radius: 20px; font-size: 12px; background: var(--primary-light); color: var(--primary); }

/* ===== 学科切换 ===== */
.subject-switch { display: flex; gap: 10px; }
.ss-item {
  flex: 1; text-align: center; padding: 11px 0; border-radius: 12px;
  background: var(--card); border: 1.5px solid #E3E5EA;
  font-size: 15px; font-weight: 600; color: var(--text-sub); cursor: pointer;
}
.ss-item:active { opacity: .8; }
.ss-item.active { color: #fff; border-color: var(--primary); }

/* ===== 首页 ===== */
.hero {
  background: linear-gradient(135deg, #4F6EF7, #7A5CF0);
  color: #fff; border-radius: 16px; padding: 20px 18px; margin-bottom: 14px;
}
.hero h2 { font-size: 22px; margin-bottom: 6px; }
.hero p { font-size: 13px; opacity: .9; }
.stats-grid { display: flex; gap: 10px; margin-bottom: 14px; }
.stat-card { flex: 1; background: var(--card); border-radius: 14px; padding: 12px 8px; text-align: center; box-shadow: 0 1px 3px rgba(0,0,0,.04); }
.stat-num { font-size: 22px; font-weight: 800; color: var(--primary); }
.stat-label { font-size: 11px; color: var(--text-sub); margin-top: 2px; }
.entry-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.entry-card { background: var(--card); border-radius: 14px; padding: 15px 12px; box-shadow: 0 1px 3px rgba(0,0,0,.04); cursor: pointer; }
.entry-card:active { transform: scale(.98); }
.entry-icon { font-size: 26px; }
.entry-name { font-weight: 700; font-size: 15px; margin-top: 6px; }
.entry-desc { font-size: 12px; color: var(--text-sub); margin-top: 2px; }

/* ===== 模块列表 ===== */
.module-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.module-card { background: var(--card); border-radius: 14px; padding: 14px 12px; box-shadow: 0 1px 3px rgba(0,0,0,.04); cursor: pointer; }
.module-card:active { transform: scale(.98); }
.module-top { display: flex; align-items: center; gap: 8px; }
.module-ic { width: 34px; height: 34px; border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 18px; color: #fff; }
.module-name { font-weight: 700; font-size: 14px; }
.module-count { font-size: 11px; color: var(--text-sub); }
.module-desc { font-size: 12px; color: var(--text-sub); margin-top: 6px; }

/* ===== 题目 ===== */
.q-card { background: var(--card); border-radius: var(--radius); padding: 18px 16px; margin-bottom: 12px; box-shadow: 0 1px 3px rgba(0,0,0,.04); }
.q-meta { display: flex; align-items: center; gap: 8px; margin-bottom: 10px; }
.q-type { font-size: 12px; padding: 2px 10px; border-radius: 20px; background: var(--primary-light); color: var(--primary); font-weight: 600; }
.q-progress { font-size: 12px; color: var(--text-sub); margin-left: auto; }
.q-text { font-size: 16.5px; font-weight: 600; line-height: 1.7; margin-bottom: 14px; word-break: break-all; }
.opt-list { display: flex; flex-direction: column; gap: 9px; }
.opt-item {
  display: flex; align-items: center; gap: 10px; padding: 12px 13px;
  border: 1.5px solid #E3E5EA; border-radius: 12px; cursor: pointer; font-size: 15.5px;
}
.opt-item:active { background: #F7F8FC; }
.opt-item .opt-key { width: 26px; height: 26px; flex-shrink: 0; border-radius: 50%; background: #F0F1F5; display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 13px; color: var(--text-sub); }
.opt-item.selected { border-color: var(--primary); background: var(--primary-light); }
.opt-item.selected .opt-key { background: var(--primary); color: #fff; }
.opt-item.correct { border-color: var(--success); background: #F0FCE8; }
.opt-item.correct .opt-key { background: var(--success); color: #fff; }
.opt-item.wrong { border-color: var(--danger); background: #FFF0F0; }
.opt-item.wrong .opt-key { background: var(--danger); color: #fff; }
.opt-item.disabled { pointer-events: none; }
.judge-row { display: flex; gap: 10px; }
.judge-btn { flex: 1; padding: 13px; border: 1.5px solid #E3E5EA; border-radius: 12px; text-align: center; font-size: 16px; font-weight: 600; cursor: pointer; }
.judge-btn.selected { border-color: var(--primary); background: var(--primary-light); color: var(--primary); }
.judge-btn.correct { border-color: var(--success); background: #F0FCE8; color: var(--success); }
.judge-btn.wrong { border-color: var(--danger); background: #FFF0F0; color: var(--danger); }
.judge-btn.disabled { pointer-events: none; }
.answer-input {
  width: 100%; padding: 12px 14px; font-size: 17px; border: 1.5px solid #E3E5EA;
  border-radius: 12px; outline: none; background: #FAFBFC;
}
.answer-input:focus { border-color: var(--primary); background: #fff; }
.feedback { margin-top: 14px; border-radius: 12px; padding: 12px 14px; font-size: 14px; display: none; }
.feedback.show { display: block; }
.feedback.correct { background: #F0FCE8; color: #389E0D; }
.feedback.wrong { background: #FFF0F0; color: #CF1322; }
.analysis { margin-top: 10px; padding: 12px 14px; background: #F7F8FC; border-radius: 12px; font-size: 13.5px; color: #4A4F58; display: none; }
.analysis.show { display: block; }
.analysis-title { font-weight: 700; color: var(--text); margin-bottom: 4px; }

/* ===== 知识点 ===== */
.knowledge-card { background: var(--card); border-radius: 14px; padding: 15px 16px; margin-bottom: 12px; box-shadow: 0 1px 3px rgba(0,0,0,.04); }
.knowledge-card h4 { font-size: 15px; margin-bottom: 8px; color: var(--primary); }
.knowledge-card ul { padding-left: 18px; }
.knowledge-card li { font-size: 13.5px; margin-bottom: 7px; color: #3D4149; }

/* ===== 模拟考试 ===== */
.exam-timer {
  position: sticky; top: 52px; z-index: 90;
  background: var(--card); border-bottom: 1px solid #EEE;
  padding: 8px 16px; display: flex; align-items: center; justify-content: space-between;
}
.exam-timer .time { font-size: 20px; font-weight: 800; color: var(--primary); font-variant-numeric: tabular-nums; }
.exam-timer .time.warn { color: var(--danger); animation: blink 1s infinite; }
@keyframes blink { 50% { opacity: .4; } }
.exam-timer .info { font-size: 12px; color: var(--text-sub); }
.exam-nav { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0; }
.exam-nav .qdot { width: 34px; height: 34px; border-radius: 10px; background: #EDEFF5; display: flex; align-items: center; justify-content: center; font-size: 13px; font-weight: 600; cursor: pointer; color: var(--text-sub); }
.exam-nav .qdot.done { background: var(--primary); color: #fff; }
.exam-nav .qdot.flagged { box-shadow: 0 0 0 2px var(--warning); }
.exam-actions { display: flex; gap: 10px; }
.exam-actions .btn { flex: 1; }

/* ===== 成绩报告 ===== */
.result-hero { text-align: center; padding: 26px 16px; }
.result-score { font-size: 56px; font-weight: 900; color: var(--primary); }
.result-score .unit { font-size: 18px; font-weight: 600; color: var(--text-sub); }
.result-msg { font-size: 15px; margin-top: 6px; font-weight: 600; }
.result-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.result-cell { background: var(--card); border-radius: 12px; padding: 12px; text-align: center; box-shadow: 0 1px 3px rgba(0,0,0,.04); }
.result-cell .num { font-size: 20px; font-weight: 800; }
.result-cell .lbl { font-size: 12px; color: var(--text-sub); }

/* ===== 错题本 ===== */
.wrong-item { background: var(--card); border-radius: 12px; padding: 13px 14px; margin-bottom: 10px; box-shadow: 0 1px 3px rgba(0,0,0,.04); }
.wrong-item .q-src { font-size: 12px; color: var(--text-sub); margin-bottom: 4px; }
.wrong-item .q-preview { font-size: 14px; font-weight: 600; margin-bottom: 8px; }
.wrong-item .wrong-actions { display: flex; gap: 8px; }
.wrong-item .btn { padding: 8px; font-size: 13px; border-radius: 9px; }

.empty { text-align: center; padding: 50px 20px; color: var(--text-sub); }
.empty .empty-icon { font-size: 48px; margin-bottom: 10px; }

/* ===== 弹窗 ===== */
.modal-mask { position: fixed; inset: 0; background: rgba(0,0,0,.45); z-index: 200; display: flex; align-items: flex-end; justify-content: center; }
.modal-box { width: 100%; max-width: 480px; background: var(--card); border-radius: 18px 18px 0 0; padding: 20px 18px calc(20px + env(safe-area-inset-bottom)); }
.modal-title { font-size: 17px; font-weight: 700; text-align: center; margin-bottom: 8px; }
.modal-desc { font-size: 14px; color: var(--text-sub); text-align: center; margin-bottom: 16px; line-height: 1.7; }

/* 打印样式 */
@media print { #tabbar, #app-header { display: none; } body { background: #fff; } }