/* MB-310 题库练习站 */
* { margin: 0; padding: 0; box-sizing: border-box; }
[hidden] { display: none !important; }
:root {
  --bg: #f3f5f9;
  --card: #ffffff;
  --ink: #1e2433;
  --ink-2: #5b6478;
  --line: #e3e7ef;
  --primary: #4f46e5;
  --primary-2: #6366f1;
  --ok: #16a34a;
  --ok-bg: #ecfdf3;
  --bad: #dc2626;
  --bad-bg: #fef2f2;
  --warn: #d97706;
  --radius: 14px;
  --shadow: 0 1px 3px rgba(20, 28, 48, .07), 0 8px 24px rgba(20, 28, 48, .06);
}
html { scroll-behavior: smooth; }
body {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  background: var(--bg); color: var(--ink); line-height: 1.65; font-size: 15px;
}
button { font-family: inherit; cursor: pointer; }
b { font-weight: 600; }
.card { background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow); }

/* ---------- 首页 ---------- */
.hero {
  background: linear-gradient(135deg, #312e81 0%, #4f46e5 55%, #7c3aed 100%);
  color: #fff; padding: 52px 20px 64px;
}
.hero-inner { max-width: 1060px; margin: 0 auto; }
.hero-badge {
  display: inline-block; font-size: 12.5px; letter-spacing: .08em;
  background: rgba(255,255,255,.16); border: 1px solid rgba(255,255,255,.25);
  padding: 4px 12px; border-radius: 999px; margin-bottom: 16px;
}
.hero h1 { font-size: 34px; line-height: 1.25; font-weight: 700; }
.hero h1 span { font-size: 20px; font-weight: 500; opacity: .92; }
.hero-sub { margin-top: 14px; opacity: .95; font-size: 14.5px; }
.home-main { max-width: 1060px; margin: -28px auto 60px; padding: 0 20px; display: grid; gap: 22px; }
.home-main h2 { font-size: 17px; margin-bottom: 12px; }

.progress-card { padding: 22px 26px; }
.progress-row { display: flex; gap: 34px; flex-wrap: wrap; margin-bottom: 16px; }
.progress-num { min-width: 70px; }
.progress-num b { font-size: 26px; display: block; }
.progress-num.ok b { color: var(--ok); }
.progress-num.bad b { color: var(--bad); }
.progress-num span { font-size: 12.5px; color: var(--ink-2); }
.bar { height: 8px; background: var(--line); border-radius: 99px; overflow: hidden; }
.bar-fill { height: 100%; width: 0%; background: linear-gradient(90deg, var(--primary-2), #7c3aed); border-radius: 99px; transition: width .4s; }
.progress-actions { margin-top: 14px; display: flex; justify-content: flex-end; }

.mode-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(215px, 1fr)); gap: 14px; }
.mode-card {
  text-align: left; background: var(--card); border: 1.5px solid transparent;
  border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow);
  transition: transform .15s, border-color .15s;
}
.mode-card:hover { transform: translateY(-3px); border-color: var(--primary-2); }
.mode-icon { font-size: 26px; margin-bottom: 8px; }
.mode-title { font-size: 16.5px; font-weight: 600; margin-bottom: 4px; }
.mode-desc { font-size: 13px; color: var(--ink-2); }

.chapter-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 14px; }
.chapter-card {
  text-align: left; background: var(--card); border-radius: var(--radius);
  padding: 16px 18px; box-shadow: var(--shadow); border: 1.5px solid transparent;
  transition: transform .15s, border-color .15s;
}
.chapter-card:hover { transform: translateY(-2px); border-color: var(--primary-2); }
.chapter-card .ch-tag { font-size: 11.5px; color: var(--primary); font-weight: 600; letter-spacing: .04em; }
.chapter-card .ch-name { font-weight: 600; margin: 2px 0 4px; }
.chapter-card .ch-meta { font-size: 12.5px; color: var(--ink-2); }

/* ---------- 顶栏 ---------- */
.topbar {
  position: sticky; top: 0; z-index: 50; display: flex; align-items: center; gap: 14px;
  background: var(--card); border-bottom: 1px solid var(--line); padding: 10px 18px;
}
.topbar-title { font-weight: 700; font-size: 15.5px; flex: 0 0 auto; }
.topbar-stats { flex: 1; font-size: 13px; color: var(--ink-2); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.topbar-timer {
  font-variant-numeric: tabular-nums; font-weight: 700; font-size: 17px;
  background: var(--bg); padding: 4px 14px; border-radius: 8px;
}
.topbar-timer.urgent { color: var(--bad); background: var(--bad-bg); }

/* ---------- 练习布局 ---------- */
.practice-layout { display: flex; gap: 18px; max-width: 1200px; margin: 18px auto; padding: 0 18px; align-items: flex-start; }
.sidebar { flex: 0 0 250px; position: sticky; top: 64px; background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow); padding: 14px; max-height: calc(100vh - 84px); overflow: auto; }
.legend { display: flex; flex-wrap: wrap; gap: 8px; font-size: 11.5px; color: var(--ink-2); margin-bottom: 10px; }
.lg { display: inline-flex; align-items: center; gap: 4px; }
.dot { width: 10px; height: 10px; border-radius: 3px; display: inline-block; background: #d7dce6; }
.dot-ok { background: var(--ok); } .dot-bad { background: var(--bad); }
.dot-flag { background: var(--warn); }
.qgrid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 6px; }
.qcell {
  border: 1px solid var(--line); background: #fff; border-radius: 7px; padding: 5px 0;
  font-size: 12px; text-align: center; color: var(--ink-2); position: relative;
}
.qcell.current { border-color: var(--primary); color: var(--primary); font-weight: 700; box-shadow: 0 0 0 2px rgba(79,70,229,.18); }
.qcell.ok { background: var(--ok-bg); border-color: #bbe7c9; color: var(--ok); }
.qcell.bad { background: var(--bad-bg); border-color: #f5c6c6; color: var(--bad); }
.qcell.flagged::after { content: "★"; position: absolute; top: -7px; right: -3px; font-size: 10px; color: var(--warn); }

.qmain { flex: 1; min-width: 0; }
.qcard { padding: 26px 30px; }
.qmeta { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 14px; }
.qno { font-weight: 700; color: var(--primary); }
.badge { font-size: 11.5px; padding: 2.5px 10px; border-radius: 999px; font-weight: 600; }
.badge-single { background: #eef2ff; color: var(--primary); }
.badge-multi { background: #fdf4ff; color: #a21caf; }
.badge-special { background: #fff7ed; color: #c2410c; }
.badge-dd { background: #f0fdfa; color: #0d9488; }

/* 下拉选择（热点）题 */
.dd-table { margin-top: 16px; border: 1.5px solid var(--line); border-radius: 11px; overflow: hidden; }
.dd-row { display: flex; border-bottom: 1px solid var(--line); }
.dd-row:last-child { border-bottom: none; }
.dd-head { background: #f1f3f9; font-weight: 600; font-size: 13.5px; }
.dd-cell { padding: 10px 14px; flex: 1; min-width: 0; font-size: 14px; }
.dd-head .dd-cell:first-child { flex: 0 0 42%; }
.dd-menu {
  width: 100%; padding: 7px 10px; border: 1.5px solid var(--line); border-radius: 8px;
  background: #fff; font-size: 14px; font-family: inherit; color: var(--ink);
}
.dd-menu:focus { outline: none; border-color: var(--primary-2); }
.dd-row.dd-ok { background: var(--ok-bg); }
.dd-row.dd-ok .dd-val { color: var(--ok); font-weight: 600; }
.dd-row.dd-bad { background: var(--bad-bg); }
.dd-row.dd-bad .dd-val { color: var(--bad); }
.dd-ans { margin-top: 4px; font-size: 12.5px; color: var(--ok); font-weight: 600; }
.dd-val { display: inline-block; }
.badge-case { background: #ecfeff; color: #0e7490; }
.btn-flag { margin-left: auto; border: 1px solid var(--line); background: #fff; border-radius: 8px; padding: 4px 12px; font-size: 12.5px; color: var(--ink-2); }
.btn-flag.on { background: #fffbeb; border-color: #fcd34d; color: var(--warn); }

/* 题干与富内容 */
.stem { font-size: 15.5px; }
.stem p { margin: 8px 0; }
.stem h4 { margin: 12px 0 6px; font-size: 15px; }
.content-html img, .qcard img { max-width: 100%; height: auto; border-radius: 8px; border: 1px solid var(--line); margin: 6px 0; cursor: zoom-in; background: #fff; }
.tablewrap { overflow-x: auto; margin: 8px 0; border-radius: 8px; border: 1px solid var(--line); }
.qcard table { border-collapse: collapse; font-size: 13.5px; min-width: 100%; }
.qcard table td, .qcard table th { border: 1px solid var(--line); padding: 7px 10px; vertical-align: top; }
.qcard table td[colspan="2"] { background: #fafbfe; }

/* 选项 */
.options { margin-top: 16px; display: grid; gap: 10px; }
.opt {
  display: flex; gap: 12px; align-items: flex-start; text-align: left; width: 100%;
  border: 1.5px solid var(--line); background: #fff; border-radius: 11px; padding: 12px 16px;
  font-size: 14.5px; transition: border-color .12s, background .12s;
}
.opt:hover:not(:disabled) { border-color: var(--primary-2); }
.opt:disabled { cursor: default; }
.opt .opt-key {
  flex: 0 0 26px; height: 26px; border-radius: 50%; border: 1.5px solid var(--line);
  display: inline-flex; align-items: center; justify-content: center; font-weight: 700; font-size: 13px; margin-top: 1px;
}
.opt.picked { border-color: var(--primary); background: #f5f5ff; }
.opt.picked .opt-key { border-color: var(--primary); background: var(--primary); color: #fff; }
.opt.correct { border-color: var(--ok); background: var(--ok-bg); }
.opt.correct .opt-key { border-color: var(--ok); background: var(--ok); color: #fff; }
.opt.wrong { border-color: var(--bad); background: var(--bad-bg); }
.opt.wrong .opt-key { border-color: var(--bad); background: var(--bad); color: #fff; }
.opt img { max-width: 100%; border-radius: 6px; border: 1px solid var(--line); }
.opt p { margin: 2px 0; }

/* 判分/答案/解析 */
.verdict { margin-top: 18px; border-radius: 11px; padding: 12px 16px; font-weight: 600; }
.verdict.ok { background: var(--ok-bg); color: var(--ok); }
.verdict.bad { background: var(--bad-bg); color: var(--bad); }
.answer-box { margin-top: 14px; border-left: 4px solid var(--primary); background: #f8f8ff; border-radius: 0 10px 10px 0; padding: 14px 18px; }
.answer-box h5 { font-size: 13px; color: var(--primary); margin-bottom: 6px; letter-spacing: .04em; }
.explanation-box { margin-top: 12px; border-left: 4px solid #94a3b8; background: #f8fafc; border-radius: 0 10px 10px 0; padding: 14px 18px; }
.explanation-box h5 { font-size: 13px; color: var(--ink-2); margin-bottom: 6px; letter-spacing: .04em; }
.explanation-box a { color: var(--primary); text-decoration: underline; word-break: break-all; }
.explanation-box hr { border: none; border-top: 1px dashed var(--line); margin: 12px 0; }
.bank-exp-note { font-size: 12px; color: #94a3b8; margin-bottom: 6px; letter-spacing: .05em; }
.dispute-box { margin-top: 12px; border: 1.5px solid #f59e0b; background: #fffbeb; border-radius: 10px; padding: 14px 18px; }
.dispute-box h5 { font-size: 13px; color: #b45309; margin-bottom: 8px; letter-spacing: .04em; }
.dispute-box p { font-size: 13.5px; margin: 4px 0; color: #78350f; }
.self-eval { margin-top: 14px; display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.self-eval .hint { font-size: 13px; color: var(--ink-2); }
.btn-ok { background: var(--ok-bg); color: var(--ok); border: 1.5px solid #bbe7c9; }
.btn-ok:hover { background: #d8f3e2; }
.btn-bad { background: var(--bad-bg); color: var(--bad); border: 1.5px solid #f5c6c6; }
.btn-bad:hover { background: #fee2e2; }

.btn-submit-opt { margin-top: 14px; }

/* 上下题 */
.qnav-btns { display: flex; align-items: center; justify-content: space-between; margin-top: 16px; }
.qnav-pos { color: var(--ink-2); font-size: 13.5px; }

/* ---------- 按钮 ---------- */
.btn {
  border: 1.5px solid var(--line); background: #fff; color: var(--ink);
  border-radius: 10px; padding: 8px 18px; font-size: 14px; font-weight: 500;
  transition: background .12s, border-color .12s;
}
.btn:hover { border-color: var(--primary-2); color: var(--primary); }
.btn-primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-2); color: #fff; }
.btn-sm { padding: 4px 12px; font-size: 12.5px; border-radius: 8px; }
.btn-ghost { border: none; background: transparent; }
.btn-ghost:hover { background: var(--bg); }
.btn:disabled { opacity: .45; pointer-events: none; }

/* ---------- 案例抽屉 ---------- */
.case-drawer {
  position: fixed; top: 0; right: 0; bottom: 0; width: min(560px, 92vw); z-index: 120;
  background: #fff; box-shadow: -12px 0 40px rgba(15,23,42,.18); display: flex; flex-direction: column;
}
.case-drawer-head { display: flex; justify-content: space-between; align-items: center; padding: 14px 18px; border-bottom: 1px solid var(--line); }
.case-drawer-body { padding: 18px; overflow: auto; font-size: 14px; }
.case-drawer-body h4 { margin: 14px 0 6px; font-size: 14.5px; }
.case-drawer-body p { margin: 7px 0; }

/* ---------- 灯箱 ---------- */
.lightbox {
  position: fixed; inset: 0; z-index: 300; background: rgba(10, 12, 20, .88);
  display: flex; align-items: center; justify-content: center; padding: 30px; cursor: zoom-out;
}
.lightbox img { max-width: 96vw; max-height: 94vh; border-radius: 10px; }

/* ---------- 结果页 ---------- */
.result-main { max-width: 760px; margin: 26px auto; padding: 0 18px; }
.result-card { padding: 30px 34px; }
.result-score { font-size: 46px; font-weight: 800; text-align: center; margin: 6px 0 2px; }
.result-score.pass { color: var(--ok); } .result-score.fail { color: var(--bad); }
.result-sub { text-align: center; color: var(--ink-2); margin-bottom: 20px; }
.result-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; text-align: center; margin-top: 10px; }
.result-grid b { font-size: 21px; display: block; }
.result-grid span { font-size: 12px; color: var(--ink-2); }
.result-actions { display: flex; gap: 10px; justify-content: center; margin-top: 22px; flex-wrap: wrap; }

/* ---------- Toast ---------- */
.toast {
  position: fixed; bottom: 26px; left: 50%; transform: translateX(-50%); z-index: 400;
  background: #1e2433; color: #fff; border-radius: 10px; padding: 9px 20px; font-size: 13.5px;
  box-shadow: 0 8px 30px rgba(15,23,42,.35); opacity: .96;
}

/* ---------- 登录页 ---------- */
.login-wrap {
  min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 24px;
  background: linear-gradient(135deg, #312e81 0%, #4f46e5 55%, #7c3aed 100%);
}
.login-card { width: min(400px, 100%); padding: 32px 30px; }
.login-badge { font-size: 12px; color: var(--primary); font-weight: 600; letter-spacing: .06em; margin-bottom: 12px; }
.login-card h1 { font-size: 22px; line-height: 1.3; margin-bottom: 6px; }
.login-sub { font-size: 13px; color: var(--ink-2); margin-bottom: 20px; }
.login-label { display: block; font-size: 13px; color: var(--ink-2); margin: 12px 0 6px; }
.login-input {
  width: 100%; padding: 10px 14px; border: 1.5px solid var(--line); border-radius: 10px;
  font-size: 14.5px; font-family: inherit; color: var(--ink); background: #fff;
}
.login-input:focus { outline: none; border-color: var(--primary-2); }
.login-error { margin-top: 12px; font-size: 13px; color: var(--bad); background: var(--bad-bg); border-radius: 8px; padding: 8px 12px; }
.login-btn { width: 100%; margin-top: 18px; padding: 11px; font-size: 15px; }

/* 首页用户区 */
.hero-inner { position: relative; }
.hero-user {
  position: absolute; top: 0; right: 0; display: flex; align-items: center; gap: 10px;
  font-size: 13px; color: rgba(255,255,255,.92);
}
.hero-user .btn-ghost { color: #fff; border: 1px solid rgba(255,255,255,.3); }
.hero-user .btn-ghost:hover { background: rgba(255,255,255,.12); color: #fff; border-color: rgba(255,255,255,.5); }

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .practice-layout { flex-direction: column; }
  .sidebar { position: static; flex: none; width: 100%; max-height: 220px; }
  .qgrid { grid-template-columns: repeat(8, 1fr); }
  .hero h1 { font-size: 26px; }
  .qcard { padding: 20px 18px; }
}

/* 手机端（≤560px）：登录→刷题→交卷 核心链路适配 */
@media (max-width: 560px) {
  .qgrid { grid-template-columns: repeat(5, 1fr); gap: 5px; }
  .qcell { padding: 7px 0; font-size: 12.5px; }
  .progress-row { gap: 20px; }

  /* 顶栏精简 */
  .topbar { gap: 8px; padding: 8px 10px; }
  .topbar-title { font-size: 14px; }
  .topbar-stats { font-size: 11.5px; }
  .topbar-timer { font-size: 15px; padding: 3px 10px; }
  .topbar .btn { padding: 6px 10px; font-size: 13px; }
  .topbar .btn-ghost { padding: 6px 8px; }

  /* 首页 */
  .hero { padding: 28px 16px 44px; }
  .hero h1 { font-size: 24px; }
  .hero h1 span { font-size: 16px; }
  .hero-sub { font-size: 13px; }
  .home-main { padding: 0 14px; margin-top: -24px; }
  .progress-card { padding: 18px 16px; }
  .progress-num b { font-size: 22px; }
  .mode-card { padding: 16px; }
  .mode-title { font-size: 15.5px; }
  .chapter-card { padding: 14px 16px; }

  /* 首页用户区：改为正常流，避免遮挡标题 */
  .hero-user { position: static; justify-content: flex-end; margin-bottom: 14px; }

  /* 选项触控 */
  .opt { padding: 13px 14px; gap: 10px; }
  .opt .opt-key { flex: 0 0 28px; height: 28px; }

  /* 下拉题：数据行 label 与下拉框上下排列 */
  .dd-row { flex-direction: column; }
  .dd-head { flex-direction: row; }
  .dd-cell { padding: 8px 12px; }
  .dd-head .dd-cell:first-child { flex: 1; }

  /* 按钮触控 */
  .btn { padding: 9px 16px; }
  .qnav-btns { gap: 8px; }

  /* 案例抽屉全宽 */
  .case-drawer { width: 100vw; }

  /* 结果页 */
  .result-card { padding: 22px 18px; }
  .result-score { font-size: 38px; }
  .result-grid { grid-template-columns: repeat(2, 1fr); }

  /* 登录页 */
  .login-wrap { padding: 16px; }
  .login-card { padding: 26px 20px; }
}

/* 超小屏（≤400px） */
@media (max-width: 400px) {
  .qgrid { grid-template-columns: repeat(4, 1fr); }
  .hero h1 { font-size: 22px; }
}