/* 807石油地质综合 · 刷题系统 —— 纯黑白技术文档风格 */
* { box-sizing: border-box; }

/* hidden 属性必须始终生效：
   .modal-mask / .field / .btnrow 等类自带 display，会覆盖浏览器默认的
   [hidden] { display: none }，导致弹窗一进页面就常驻显示。 */
[hidden] { display: none !important; }

:root {
  --line: #d8d8d8;
  --line-strong: #9a9a9a;
  --ink: #111111;
  --ink-2: #4a4a4a;
  --ink-3: #7c7c7c;
  --bg: #f4f4f4;
  --paper: #ffffff;
  --ok-bg: #eef6ee;
  --ok-line: #4c8b4c;
  --bad-bg: #fbeeee;
  --bad-line: #b04a4a;
}

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font: 15px/1.65 "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC", sans-serif;
  -webkit-text-size-adjust: 100%;
}

b { font-weight: 700; }

/* ---------------- 顶栏 ---------------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
  padding: 10px 18px;
  background: var(--paper);
  border-bottom: 2px solid var(--ink);
}

.brand { display: flex; align-items: center; gap: 10px; }
.logo {
  display: grid;
  place-items: center;
  width: 38px; height: 38px;
  border: 2px solid var(--ink);
  font-weight: 700;
  letter-spacing: .5px;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.25; }
.brand-text strong { font-size: 16px; }
.brand-text em { font-style: normal; font-size: 12px; color: var(--ink-3); }

.modes { display: flex; gap: 6px; flex-wrap: wrap; margin-left: auto; }
.mode-btn {
  padding: 6px 12px;
  border: 1px solid var(--line-strong);
  background: var(--paper);
  color: var(--ink);
  font-size: 13.5px;
  cursor: pointer;
}
.mode-btn:hover { background: #f0f0f0; }
.mode-btn.active { background: var(--ink); color: #fff; border-color: var(--ink); }

.topstats { display: flex; gap: 14px; font-size: 13px; color: var(--ink-2); }
.topstats b { font-variant-numeric: tabular-nums; }

/* ---------------- 布局 ---------------- */
.layout {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  gap: 16px;
  padding: 16px;
  align-items: start;
  max-width: 1500px;
  margin: 0 auto;
}

.card {
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 14px 16px;
  margin-bottom: 14px;
}
.card h2 { margin: 0 0 10px; font-size: 17px; }
.card h3 {
  margin: 0 0 10px;
  font-size: 14px;
  padding-bottom: 5px;
  border-bottom: 1px solid var(--line);
}

/* ---------------- 侧栏 ---------------- */
.sidebar { position: sticky; top: 74px; }
.sidebar .card:last-child { margin-bottom: 0; }

.field { display: block; margin-bottom: 10px; }
.field > span { display: block; font-size: 12.5px; color: var(--ink-3); margin-bottom: 3px; }

select, input[type="search"], input[type="number"], input[type="text"] {
  width: 100%;
  padding: 7px 8px;
  border: 1px solid var(--line-strong);
  background: var(--paper);
  color: var(--ink);
  font: inherit;
  font-size: 14px;
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--ink); outline-offset: -1px; }

.check { display: flex; align-items: flex-start; gap: 7px; font-size: 13.5px; margin-bottom: 7px; cursor: pointer; }
.check input { margin: 3px 0 0; }
.check input:disabled + span { color: var(--ink-3); }

.btn {
  padding: 7px 13px;
  border: 1px solid var(--ink);
  background: var(--paper);
  color: var(--ink);
  font: inherit;
  font-size: 14px;
  cursor: pointer;
}
.btn:hover { background: #f0f0f0; }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn.primary { background: var(--ink); color: #fff; }
.btn.primary:hover { background: #333; }
.btn.ghost { border-color: var(--line-strong); font-size: 13px; padding: 6px 10px; }
.btn.danger { border-color: var(--bad-line); color: var(--bad-line); }
.btn.danger:hover { background: var(--bad-bg); }
.btn.block { width: 100%; margin-top: 4px; }

.btnrow { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 8px; }

.hint { font-size: 12.5px; color: var(--ink-3); margin: 6px 0 0; }
.hint.pad { padding: 0 4px; }

.banklist { list-style: none; margin: 0; padding: 0; font-size: 13px; }
.banklist li { display: flex; justify-content: space-between; padding: 3px 0; border-bottom: 1px dotted var(--line); }
.banklist li:last-child { border-bottom: none; }
.banklist .n { color: var(--ink-2); font-variant-numeric: tabular-nums; }

/* ---------------- 题目区 ---------------- */
.quizbar { display: flex; justify-content: space-between; align-items: center; gap: 14px; flex-wrap: wrap; padding: 10px 16px; }
.qmeta { display: flex; gap: 6px; flex-wrap: wrap; }
.badge {
  display: inline-block;
  padding: 2px 9px;
  border: 1px solid var(--ink);
  font-size: 12px;
  white-space: nowrap;
}
.badge.ghost { border-color: var(--line-strong); color: var(--ink-2); }

.qpos { display: flex; align-items: center; gap: 10px; font-size: 13px; color: var(--ink-2); font-variant-numeric: tabular-nums; }
.progress { width: 150px; height: 8px; border: 1px solid var(--line-strong); background: #eee; }
.progress > i { display: block; height: 100%; background: var(--ink); transition: width .2s; }

.question { min-height: 260px; }
.qtext { font-size: 17px; line-height: 1.75; margin: 0 0 14px; white-space: pre-wrap; }
.qtext .blank {
  display: inline-block;
  min-width: 68px;
  border-bottom: 1.5px solid var(--ink);
  text-align: center;
  color: var(--ink-2);
}

/* 选项 */
.options { display: grid; gap: 8px; }
.opt {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 9px 12px;
  border: 1px solid var(--line);
  background: var(--paper);
  cursor: pointer;
  text-align: left;
  font: inherit;
  font-size: 15px;
  color: var(--ink);
  width: 100%;
}
.opt:hover { background: #f6f6f6; }
.opt .key {
  flex: 0 0 24px;
  height: 24px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line-strong);
  font-size: 13px;
  font-weight: 700;
}
.opt.picked { border-color: var(--ink); background: #f0f0f0; }
.opt.picked .key { background: var(--ink); color: #fff; border-color: var(--ink); }
.opt.correct { border-color: var(--ok-line); background: var(--ok-bg); }
.opt.correct .key { background: var(--ok-line); color: #fff; border-color: var(--ok-line); }
.opt.wrong { border-color: var(--bad-line); background: var(--bad-bg); }
.opt.wrong .key { background: var(--bad-line); color: #fff; border-color: var(--bad-line); }
.opt.locked { cursor: default; }

/* 填空题 */
.blanks { display: grid; gap: 10px; margin-bottom: 6px; }
.blankrow { display: flex; align-items: center; gap: 10px; }
.blankrow .no { flex: 0 0 62px; font-size: 13px; color: var(--ink-3); }
.blankrow input { flex: 1 1 auto; }
.blankrow .verdict { flex: 0 0 auto; font-size: 13px; font-weight: 700; }
.blankrow.ok input { border-color: var(--ok-line); background: var(--ok-bg); }
.blankrow.bad input { border-color: var(--bad-line); background: var(--bad-bg); }
.blankrow.ok .verdict { color: var(--ok-line); }
.blankrow.bad .verdict { color: var(--bad-line); }

/* 自评（名词解释 / 简答） */
.selfeval { display: flex; gap: 8px; flex-wrap: wrap; }
.selfeval .btn { min-width: 92px; }

/* 反馈 */
.feedback {
  margin-top: 14px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  background: #fafafa;
  font-size: 14.5px;
}
.feedback.ok { border-color: var(--ok-line); background: var(--ok-bg); }
.feedback.bad { border-color: var(--bad-line); background: var(--bad-bg); }
.feedback .verdict-line { font-weight: 700; margin-bottom: 8px; font-size: 15px; }
.feedback .ans { white-space: pre-wrap; margin: 0 0 8px; }
.feedback .ans .hl { font-weight: 700; }
.feedback .explain { white-space: pre-wrap; color: var(--ink-2); margin: 0; font-size: 14px; }
.feedback .keys { font-size: 13px; color: var(--ink-2); margin: 0 0 6px; }

.actions { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.actions .spacer { flex: 1 1 auto; }
.actions input[type="number"] { width: 74px; }

/* ---------------- 统计 ---------------- */
.statgrid { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 12px; }
.statbox { border: 1px solid var(--line); padding: 10px 12px; }
.statbox .k { font-size: 12.5px; color: var(--ink-3); }
.statbox .v { font-size: 22px; font-weight: 700; font-variant-numeric: tabular-nums; }

.bar-row { display: grid; grid-template-columns: 190px 1fr 110px; gap: 10px; align-items: center; padding: 4px 0; font-size: 13.5px; }
.bar { height: 14px; border: 1px solid var(--line-strong); background: #eee; }
.bar > i { display: block; height: 100%; background: var(--ink); }
.bar-row .num { text-align: right; color: var(--ink-2); font-variant-numeric: tabular-nums; }

.wrong-item { padding: 9px 0; border-bottom: 1px dotted var(--line); font-size: 14px; }
.wrong-item:last-child { border-bottom: none; }
.wrong-item .t { font-weight: 700; }
.wrong-item .m { font-size: 12.5px; color: var(--ink-3); }
.wrong-item .a { font-size: 13.5px; color: var(--ink-2); white-space: pre-wrap; }

/* ---------------- 查考点 ---------------- */
.browse-result { margin-top: 12px; }
.kp-block { border: 1px solid var(--line); margin-bottom: 12px; }
.kp-block > h4 { margin: 0; padding: 8px 12px; font-size: 14.5px; border-bottom: 1px solid var(--line); background: #f7f7f7; }
.kp-block .rows { padding: 4px 12px 10px; }
.kp-row { padding: 7px 0; border-bottom: 1px dotted var(--line); font-size: 14px; }
.kp-row:last-child { border-bottom: none; }
.kp-row .tag { display: inline-block; min-width: 62px; font-size: 12px; color: var(--ink-3); }
mark { background: #ffe9a8; color: inherit; padding: 0 1px; }
.empty { color: var(--ink-3); font-size: 14px; padding: 10px 0; }

/* ---------------- 账号 / 云同步 ---------------- */
.account { display: flex; align-items: center; gap: 8px; margin-left: 4px; }

.sync-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #b9b9b9;
  border: 1px solid var(--line-strong);
  flex: 0 0 auto;
}
.sync-dot.ok { background: var(--ok-line); border-color: var(--ok-line); }
.sync-dot.err { background: var(--bad-line); border-color: var(--bad-line); }
.sync-dot.busy { background: #d8a53a; border-color: #b8871f; animation: pulse 1s infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: .35; } }

.auth-line { font-size: 13.5px; margin: 0 0 4px; font-weight: 700; }

.modal-mask {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, .45);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 80;
  padding: 16px;
}
.modal {
  background: var(--paper);
  border: 1px solid var(--ink);
  width: 100%;
  max-width: 460px;
  max-height: 90vh;
  overflow: auto;
  box-shadow: 0 8px 30px rgba(0, 0, 0, .3);
}
.modal-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 2px solid var(--ink);
}
.modal-head strong { font-size: 16px; }
.modal-x {
  border: 1px solid var(--line-strong);
  background: var(--paper);
  width: 28px;
  height: 28px;
  font-size: 16px;
  line-height: 1;
  cursor: pointer;
}
.modal-x:hover { background: #f0f0f0; }
.modal-body { padding: 14px 16px; }
.modal-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 16px;
  border-top: 1px solid var(--line);
  flex-wrap: wrap;
}
.modal .field > span { font-size: 12.5px; }
.modal .btnrow { margin-top: 4px; }
.sep { border: none; border-top: 1px dashed var(--line-strong); margin: 14px 0 10px; }
.auth-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.auth-error {
  margin: 8px 0 0;
  padding: 8px 10px;
  border: 1px solid var(--bad-line);
  background: var(--bad-bg);
  color: #8e2f2f;
  font-size: 13.5px;
}

.rank-table { width: 100%; border-collapse: collapse; font-size: 14px; margin-top: 8px; }
.rank-table th, .rank-table td {
  border: 1px solid var(--line);
  padding: 6px 8px;
  text-align: center;
  font-variant-numeric: tabular-nums;
}
.rank-table th { background: #f2f2f2; font-weight: 700; }
.rank-table td:nth-child(2) { text-align: left; }
.rank-table tr.me { background: #f0f0f0; font-weight: 700; }

/* ---------------- toast ---------------- */
.toast {
  position: fixed;
  left: 50%;
  bottom: 26px;
  transform: translateX(-50%);
  background: var(--ink);
  color: #fff;
  padding: 9px 18px;
  font-size: 14px;
  z-index: 60;
  max-width: 80vw;
}

/* ---------------- 窄屏 ---------------- */
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; padding: 10px; }
  .sidebar { position: static; }
  .topbar { gap: 10px; padding: 8px 12px; }
  .modes { margin-left: 0; width: 100%; }
  .mode-btn { flex: 1 1 auto; text-align: center; }
  .topstats { width: 100%; justify-content: space-between; }
  .bar-row { grid-template-columns: 110px 1fr 86px; font-size: 12.5px; }
  .qtext { font-size: 16px; }
  .actions .btn { flex: 1 1 30%; }
  .actions .spacer { display: none; }
}

@media print {
  .topbar, .sidebar, .actions, .quizbar { display: none; }
  .layout { display: block; padding: 0; }
  .card { border: none; padding: 0; margin: 0 0 12px; }
}