/* ============ 多专业题库 Web 刷题端 ============ */
:root {
  --primary: #1e6fff;
  --primary-light: rgba(30, 111, 255, .08);
  --success: #1cc18d;
  --success-light: rgba(28, 193, 141, .1);
  --error: #fa6c6c;
  --error-light: rgba(250, 108, 108, .1);
  --warn: #f5a623;
  --warn-light: rgba(245, 166, 35, .12);
  --kp: #7b5cff;
  --kp-light: rgba(123, 92, 255, .1);
  --bg: #f4f6fb;
  --card: #ffffff;
  --border: #e5e9f2;
  --text: #252b3a;
  --text-2: #5b6478;
  --muted: #98a1b3;
  --radius: 10px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: "PingFang SC", "Microsoft YaHei", sans-serif; background: var(--bg); color: var(--text); font-size: 14px; }
.wrap { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.main { min-height: calc(100vh - 130px); padding: 24px 20px; }
a { color: inherit; text-decoration: none; }

/* 顶栏 */
.topbar { background: var(--card); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 50; }
.topbar-inner { display: flex; align-items: center; height: 60px; gap: 28px; }
.brand { font-size: 18px; font-weight: 700; color: var(--primary); white-space: nowrap; }
.nav { display: flex; gap: 6px; flex: 1; }
.nav a { padding: 8px 16px; border-radius: 8px; color: var(--text-2); font-size: 15px; }
.nav a:hover { background: var(--primary-light); color: var(--primary); }
.nav a.active { background: var(--primary-light); color: var(--primary); font-weight: 600; }
.topbar-right { display: flex; align-items: center; gap: 12px; }
.user-chip { display: flex; align-items: center; gap: 8px; color: var(--text-2); }
.avatar { width: 34px; height: 34px; border-radius: 50%; background: var(--primary); color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 700; }
.footer { background: var(--card); border-top: 1px solid var(--border); color: var(--muted); font-size: 13px; padding: 18px 0; margin-top: 30px; }

/* 通用 */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; border: none; border-radius: 8px; padding: 10px 22px; font-size: 14px; cursor: pointer; background: var(--primary); color: #fff; }
.btn:hover { opacity: .92; }
.btn.plain { background: var(--card); color: var(--primary); border: 1px solid var(--primary); }
.btn.big { padding: 13px 34px; font-size: 16px; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.card { background: var(--card); border-radius: var(--radius); border: 1px solid var(--border); padding: 20px; }
.tag { display: inline-block; font-size: 12px; border-radius: 4px; padding: 2px 10px; }
.tag.blue { background: var(--primary-light); color: var(--primary); }
.tag.purple { background: var(--kp-light); color: var(--kp); }
.tag.cyan { background: rgba(28,193,141,.1); color: var(--success); }
.tag.orange { background: var(--warn-light); color: var(--warn); }
.tag.gray { background: #eef1f6; color: var(--muted); }
.tag.green { background: var(--success-light); color: var(--success); }
.tag.red { background: var(--error-light); color: var(--error); }
.tag.yellow { background: var(--warn-light); color: var(--warn); }
.muted { color: var(--muted); }
.page-loading { text-align: center; color: var(--muted); padding: 80px 0; }
.empty { text-align: center; color: var(--muted); padding: 60px 0; }
.empty .btn { margin-top: 16px; }

/* 登录页 */
.login-page { max-width: 420px; margin: 60px auto; }
.login-page .card { padding: 34px; }
.login-title { font-size: 20px; font-weight: 700; text-align: center; margin-bottom: 24px; }
.form-item { margin-bottom: 16px; }
.form-item label { display: block; color: var(--text-2); margin-bottom: 6px; font-size: 13px; }
.form-item input, .form-item select, .form-item textarea { width: 100%; border: 1px solid var(--border); border-radius: 8px; padding: 11px 14px; font-size: 14px; outline: none; }
.form-item input:focus { border-color: var(--primary); }
.login-divider { display: flex; align-items: center; gap: 12px; color: var(--muted); font-size: 12px; margin: 20px 0; }
.login-divider::before, .login-divider::after { content: ""; flex: 1; height: 1px; background: var(--border); }
.wechat-btn { width: 100%; background: #07c160; color: #fff; }
.wechat-btn:disabled { background: #a8d9bd; }
.qr-box { text-align: center; padding: 10px 0 4px; }
.qr-box img { width: 220px; height: 220px; object-fit: cover; border: 1px solid var(--border); border-radius: 8px; background: #fff; }
.qr-tip { color: var(--text-2); margin-top: 10px; }
.login-error { color: var(--error); font-size: 13px; margin: 8px 0; min-height: 18px; }

/* 首页 */
.banner { position: relative; border-radius: var(--radius); overflow: hidden; height: 300px; background: linear-gradient(135deg, #1e6fff, #7b5cff); }
.banner img { width: 100%; height: 100%; object-fit: cover; }
.banner-slide { display: none; }
.banner-slide.active { display: block; }
.banner-caption { position: absolute; left: 0; right: 0; bottom: 0; padding: 40px 30px 22px; color: #fff; background: linear-gradient(transparent, rgba(0,0,0,.55)); font-size: 20px; font-weight: 600; }
.banner-dots { position: absolute; right: 20px; bottom: 16px; display: flex; gap: 8px; }
.banner-dots span { width: 10px; height: 10px; border-radius: 50%; background: rgba(255,255,255,.5); cursor: pointer; }
.banner-dots span.on { background: #fff; }
.home-grid { display: grid; grid-template-columns: 2fr 1fr; gap: 20px; margin-top: 20px; }
.home-entries { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.home-entry { border-radius: var(--radius); padding: 22px; cursor: pointer; }
.home-entry h3 { font-size: 17px; margin-bottom: 6px; }
.home-entry p { color: var(--text-2); font-size: 13px; }
.home-entry.practice { background: var(--primary-light); }
.home-entry.kp { background: var(--kp-light); }
.home-entry.exam { background: var(--warn-light); }
.home-entry.upload { background: var(--success-light); }
.home-side { display: flex; flex-direction: column; gap: 20px; }
.stat-row { display: flex; gap: 14px; margin-top: 20px; }
.stat-card { flex: 1; background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); text-align: center; padding: 20px 0; }
.stat-card b { font-size: 26px; display: block; }
.stat-card span { color: var(--muted); font-size: 13px; }
.ad-slot { margin-top: 20px; border-radius: var(--radius); overflow: hidden; }
.ad-slot img { width: 100%; height: 96px; object-fit: cover; display: block; }
.ad-placeholder { height: 96px; display: flex; align-items: center; justify-content: center; color: var(--muted); background: #e9edf5; font-size: 13px; }

/* 工作台布局 */
.workspace { display: grid; grid-template-columns: 240px 1fr 280px; gap: 20px; align-items: start; }
.tree-panel, .side-panel { position: sticky; top: 84px; }
.tree-node { padding: 9px 12px; border-radius: 8px; cursor: pointer; color: var(--text-2); display: flex; justify-content: space-between; align-items: center; gap: 6px; }
.tree-node:hover { background: var(--bg); }
.tree-node.l1 { font-weight: 600; color: var(--text); margin-top: 6px; }
.tree-node.l3 { padding-left: 40px; }
.tree-node.active { background: var(--primary-light); color: var(--primary); }
.tree-node .cnt { font-size: 12px; color: var(--muted); }
.kp-chip { display: inline-flex; align-items: center; gap: 6px; border: 1px solid rgba(123,92,255,.35); background: var(--kp-light); color: var(--kp); border-radius: 999px; padding: 4px 12px; font-size: 12px; margin: 0 8px 8px 0; cursor: pointer; }
.kp-chip.dim { opacity: .45; }

/* 题卡 */
.q-head { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.q-no { color: var(--muted); font-size: 13px; }
.q-stem { font-size: 16px; line-height: 1.7; margin-bottom: 18px; }
.q-stem img { max-width: 100%; }
.opt { display: flex; gap: 10px; border: 1px solid var(--border); border-radius: 8px; padding: 12px 14px; margin-bottom: 10px; cursor: pointer; align-items: flex-start; }
.opt:hover { border-color: var(--primary); }
.opt .key { font-weight: 700; color: var(--primary); min-width: 18px; }
.opt.correct { border-color: var(--success); background: var(--success-light); }
.opt.correct .key { color: var(--success); }
.opt.wrong { border-color: var(--error); background: var(--error-light); }
.opt.wrong .key { color: var(--error); }
.opt.picked { border-color: var(--primary); background: var(--primary-light); }
.q-result { margin-top: 16px; border-top: 1px dashed var(--border); padding-top: 14px; }
.q-result .verdict { font-weight: 700; margin-bottom: 8px; }
.verdict.ok { color: var(--success); }
.verdict.bad { color: var(--error); }
.q-analysis { color: var(--text-2); line-height: 1.7; background: #f8f9fc; border-radius: 8px; padding: 12px; margin-top: 8px; }
.blank-input { border: 1px solid var(--border); border-radius: 6px; padding: 9px 12px; width: 260px; margin: 4px 8px 4px 0; }
.q-actions { display: flex; gap: 12px; margin-top: 18px; flex-wrap: wrap; }

/* 答题卡 */
.card-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 8px; margin-top: 12px; }
.card-cell { height: 38px; border-radius: 8px; display: flex; align-items: center; justify-content: center; cursor: pointer; background: #eef1f6; color: var(--text-2); font-size: 13px; position: relative; }
.card-cell.answered { background: var(--success-light); color: var(--success); font-weight: 600; }
.card-cell.missed { background: var(--error-light); color: var(--error); font-weight: 600; }
.card-cell.current { outline: 2px solid var(--primary); }
.card-cell.marked::after { content: ""; position: absolute; top: 4px; right: 4px; width: 7px; height: 7px; border-radius: 50%; background: var(--warn); }
.legend { display: flex; gap: 14px; color: var(--muted); font-size: 12px; margin-top: 10px; flex-wrap: wrap; }
.legend i { display: inline-block; width: 10px; height: 10px; border-radius: 3px; margin-right: 4px; }

/* 错题分组列表 */
.group-list .group-item { display: flex; justify-content: space-between; align-items: center; padding: 16px 18px; border-bottom: 1px solid var(--border); cursor: pointer; }
.group-list .group-item:hover { background: var(--bg); }
.group-item b { font-size: 15px; }
.badge-red { background: var(--error-light); color: var(--error); border-radius: 999px; padding: 2px 12px; font-size: 13px; }

/* AI 面板 */
.ai-panel { max-height: 520px; display: flex; flex-direction: column; }
.ai-log { flex: 1; overflow-y: auto; display: flex; flex-direction: column; gap: 12px; padding: 4px 2px; min-height: 200px; }
.ai-msg { border-radius: 10px; padding: 12px 14px; line-height: 1.7; font-size: 13px; white-space: pre-wrap; word-break: break-word; }
.ai-msg.bot { background: #f4f6fb; color: var(--text); }
.ai-msg.me { background: var(--primary-light); color: var(--text); align-self: flex-end; max-width: 85%; }
.ai-msg.bot { max-width: 95%; }
.ai-quick { display: flex; gap: 8px; margin-top: 10px; }
.ai-quick button { flex: 1; background: var(--kp-light); color: var(--kp); border: 1px solid rgba(123,92,255,.35); border-radius: 999px; padding: 7px 0; font-size: 12px; cursor: pointer; }
.ai-input-row { display: flex; gap: 8px; margin-top: 10px; }
.ai-input-row input { flex: 1; border: 1px solid var(--border); border-radius: 999px; padding: 9px 14px; outline: none; }
.ai-input-row button { border: none; background: var(--kp); color: #fff; border-radius: 999px; padding: 0 18px; cursor: pointer; }
.ai-locked { text-align: center; color: var(--muted); padding: 30px 10px; }

/* 表格与表单页 */
.table { width: 100%; border-collapse: collapse; }
.table th, .table td { text-align: left; padding: 11px 12px; border-bottom: 1px solid var(--border); font-size: 13px; }
.table th { color: var(--muted); font-weight: 500; background: #fafbfd; }
.toolbar { display: flex; gap: 10px; margin-bottom: 14px; align-items: center; flex-wrap: wrap; }
.upload-drag { border: 2px dashed var(--border); border-radius: var(--radius); padding: 40px; text-align: center; color: var(--muted); cursor: pointer; }
.upload-drag:hover { border-color: var(--primary); color: var(--primary); }
.progress { height: 8px; background: #eef1f6; border-radius: 999px; overflow: hidden; }
.progress i { display: block; height: 100%; background: var(--primary); border-radius: 999px; }
.steps { display: flex; gap: 10px; margin-bottom: 18px; }
.step { flex: 1; background: #fafbfd; border: 1px solid var(--border); border-radius: 8px; padding: 14px; }
.step b { color: var(--primary); }

/* toast */
#toast { position: fixed; top: 76px; left: 50%; transform: translateX(-50%); background: rgba(37,43,58,.92); color: #fff; padding: 10px 22px; border-radius: 999px; font-size: 14px; z-index: 999; display: none; }