/* ============================================================
   网络科技部 · 编程组纳新测试 — /exam
   tokens 复刻门户 style.css（实测自 materials/banner）
   ============================================================ */
:root {
  --navy:  #000E83;
  --deep:  #00065C;
  --royal: #0038D7;
  --cyan:  #8FD9FF;
  --ice:   #EEF2FF;
  --dim:   #A7B3F0;
  --ink:   #050B4A;

  --font-body: 'MiSans', 'HarmonyOS Sans SC', 'PingFang SC', 'Microsoft YaHei UI', 'Microsoft YaHei', system-ui, sans-serif;
  --font-mono: 'Cascadia Code', 'Consolas', 'SF Mono', ui-monospace, monospace;

  --hair: rgba(255, 255, 255, .18);
  --hair-ice: rgba(5, 11, 74, .18);
  --halftone: radial-gradient(circle, rgba(255,255,255,.10) 1.2px, transparent 1.4px);
  --panel: rgba(0, 6, 92, .55);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ice);
  background: var(--navy);
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
body::before {                          /* 半调圆点纹理，与门户一致 */
  content: "";
  position: fixed;
  inset: 0;
  background-image: var(--halftone);
  background-size: 15px 15px;
  opacity: .5;
  pointer-events: none;
  z-index: 0;
}
img { display: block; max-width: 100%; }
a { color: var(--cyan); text-decoration: none; }
::selection { background: var(--royal); color: #fff; }
:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; }
.mono { font-family: var(--font-mono); }
[hidden] { display: none !important; }

@media (prefers-reduced-motion: no-preference) {
  .view, .modal-card { animation: rise .4s ease both; }
  .modal { animation: fadeIn .18s ease both; }
  @keyframes rise { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }
  @keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
  .review-item.is-flash { animation: rvflash 1.1s ease; }
  @keyframes rvflash { 0% { box-shadow: 0 0 0 2px rgba(143, 217, 255, .9); } 100% { box-shadow: 0 0 0 14px rgba(143, 217, 255, 0); } }
}

/* ---------- 细滚动条（与管理后台同款） ---------- */
* { scrollbar-width: thin; scrollbar-color: rgba(143, 217, 255, .3) transparent; }
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: rgba(0, 6, 92, .4); }
::-webkit-scrollbar-thumb { background: rgba(143, 217, 255, .28); }
::-webkit-scrollbar-thumb:hover { background: rgba(143, 217, 255, .5); }
::-webkit-scrollbar-corner { background: transparent; }

/* ---------- 顶栏 ---------- */
.topbar {
  position: sticky; top: 0; z-index: 40;
  display: flex; align-items: center; justify-content: space-between;
  height: 68px; padding: 0 24px;
  background: rgba(0, 6, 92, .8);
  border-bottom: 1px solid var(--hair);
  backdrop-filter: blur(6px);
}
.brand { display: flex; align-items: center; gap: 12px; color: var(--ice); }
.brand-logo { width: 38px; height: 38px; object-fit: contain; }
.brand-text { display: flex; flex-direction: column; line-height: 1.3; }
.brand-text b { font-size: 16px; font-weight: 800; letter-spacing: .04em; }
.brand-text small { font-size: 11px; color: var(--dim); font-family: var(--font-mono); }
.top-status { display: none; }
.foot-status { color: var(--royal); font-size: 12px; letter-spacing: .12em; margin-bottom: 4px; }
.foot-note { color: var(--dim); font-size: 12px; margin-top: 2px; }
.foot-note a[href*="beian"] {
  color: var(--cyan) !important;
  font-weight: 600;
}
.foot-note a[href*="beian"]:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 布局 ---------- */
main { flex: 1; position: relative; z-index: 1; }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 24px; }
.view { padding: 56px 0 72px; }
.eyebrow {
  font-family: var(--font-mono); font-size: 13px;
  letter-spacing: .14em; color: var(--cyan);
  margin-bottom: 14px;
}
.h1 {
  font-size: clamp(30px, 4.6vw, 46px);
  font-weight: 900; letter-spacing: .02em; line-height: 1.25;
  margin-bottom: 14px;
}
.lead { color: var(--dim); max-width: 640px; margin-bottom: 40px; }

/* ---------- win 终端窗框 ---------- */
.win-frame { border: 1px solid var(--hair); background: var(--panel); }
.win-bar {
  display: flex; align-items: center; gap: 8px;
  font-family: var(--font-mono); font-size: 12px;
  color: var(--dim); letter-spacing: .06em;
  padding: 10px 14px;
  border-bottom: 1px solid var(--hair);
  background: rgba(0, 6, 92, .55);
}
.win-bar span { color: var(--royal); font-size: 10px; }
.win-bar em { font-style: normal; margin-left: auto; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-block; min-height: 48px; cursor: pointer;
  font-family: var(--font-mono); font-size: 15px; letter-spacing: .05em;
  padding: 12px 26px; border: 1px solid var(--cyan);
  transition: background .18s, color .18s, border-color .18s, transform .06s;
}
.btn:active { transform: translateY(1px) scale(.99); }
.btn-primary { background: var(--cyan); color: var(--deep); font-weight: 700; }
.btn-primary:hover { background: #fff; border-color: #fff; }
.btn-primary:disabled { opacity: .4; cursor: not-allowed; }
.btn-primary:disabled:hover { background: var(--cyan); border-color: var(--cyan); }
.btn-ghost { background: transparent; color: var(--ice); border-color: var(--hair); }
.btn-ghost:hover { border-color: var(--cyan); color: var(--cyan); }
.btn-block { width: 100%; }

/* ---------- 难度卡片 ---------- */
.diff-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px;
  margin-bottom: 64px;
}
.diff-card {
  cursor: pointer; text-align: left;
  border: 1px solid var(--hair); background: var(--panel);
  color: var(--ice); padding: 0;
  transition: border-color .18s, transform .18s, background .18s;
}
.diff-card:hover { border-color: var(--cyan); background: rgba(0, 14, 160, .5); transform: translateY(-3px); }
.diff-card .win-bar { border-bottom: 1px solid var(--hair); }
.diff-body { display: block; padding: 20px 18px 18px; }
.diff-body b { display: block; font-size: 20px; font-weight: 800; margin-bottom: 6px; }
.diff-body small { display: block; color: var(--dim); font-size: 13.5px; line-height: 1.7; min-height: 46px; }
.diff-go { display: block; margin-top: 14px; color: var(--cyan); font-size: 13px; letter-spacing: .08em; }

/* ---------- 排行榜 ---------- */
.board-sec { max-width: 860px; }
.board-head { display: flex; align-items: flex-end; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
.tabs { display: flex; gap: 8px; margin-bottom: 14px; }
.tab {
  cursor: pointer; font-size: 13px; letter-spacing: .08em;
  color: var(--dim); background: transparent;
  border: 1px solid var(--hair); padding: 8px 16px;
  transition: color .15s, border-color .15s, background .15s;
}
.tab:hover { color: var(--cyan); border-color: var(--cyan); }
.tab.is-active { color: var(--deep); background: var(--cyan); border-color: var(--cyan); font-weight: 700; }
.board-body { overflow-x: auto; }
.board { width: 100%; border-collapse: collapse; font-size: 14.5px; }
.board th, .board td { text-align: left; padding: 10px 16px; border-bottom: 1px solid rgba(255,255,255,.08); }
.board th { font-family: var(--font-mono); font-size: 12px; color: var(--dim); letter-spacing: .1em; }
.board td.rank { font-family: var(--font-mono); color: var(--cyan); width: 56px; }
.board td.score { font-family: var(--font-mono); font-weight: 700; }
.board td.time { font-family: var(--font-mono); color: var(--dim); }
.board tr.top1 td { background: rgba(143, 217, 255, .08); }
.board tbody tr { transition: background .15s; }
.board tbody tr:hover td { background: rgba(143, 217, 255, .05); }
.board td.board-empty { color: var(--dim); text-align: center; padding: 28px 0 !important; }

/* ---------- 考试条 ---------- */
.exam-bar {
  position: sticky; top: 0; z-index: 40;
  display: flex; align-items: center; gap: 18px; flex-wrap: wrap;
  padding: 12px 24px;
  background: rgba(0, 6, 92, .92);
  border-bottom: 1px solid var(--hair);
  backdrop-filter: blur(6px);
}
.exam-timer { font-size: 22px; font-weight: 700; color: var(--cyan); min-width: 96px; }
.exam-timer.is-low { color: #FF9D9D; }
.exam-progress { font-size: 15px; letter-spacing: .06em; }
.exam-viol { font-size: 13px; color: var(--dim); }
.exam-viol.is-hot { color: #FF9D9D; }
.exam-hint { margin-left: auto; font-size: 12px; color: var(--dim); letter-spacing: .06em; }
.exam-submit { display: none; }   /* 仅手机竖屏显示：无需滚到答题卡即可交卷 */

/* ---------- 考试网格 ---------- */
.exam-grid { padding-top: 28px; display: grid; grid-template-columns: 1fr 216px; gap: 20px; align-items: start; }
#viewExam { user-select: none; }        /* 考试中禁止划选题干（防复制外带） */
#viewExam input, #viewExam textarea,
.term-screen, .term-input { user-select: text; }
.q-body { padding: 22px 22px 8px; min-height: 300px; }
.q-meta-line { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 14px; }
.q-tag {
  font-family: var(--font-mono); font-size: 11.5px; letter-spacing: .08em;
  color: var(--cyan); border: 1px solid var(--hair); padding: 3px 10px;
}
.q-stem { font-size: 17px; line-height: 1.85; margin-bottom: 22px; font-weight: 500; }
.q-stem .req { color: var(--cyan); }

.q-opt {
  display: flex; gap: 12px; align-items: flex-start;
  border: 1px solid var(--hair); padding: 13px 16px; margin-bottom: 10px;
  cursor: pointer; transition: border-color .15s, background .15s;
  user-select: none;
}
.q-opt:hover { border-color: var(--cyan); }
.q-opt.is-sel { border-color: var(--cyan); background: rgba(143, 217, 255, .12); }
.q-opt input { accent-color: var(--royal); margin-top: 5px; flex: none; }
.q-opt .idx { font-family: var(--font-mono); color: var(--cyan); flex: none; }
.q-opt .txt { line-height: 1.7; }

.input {
  width: 100%; min-height: 48px;
  background: rgba(0, 6, 92, .4);
  border: 1px solid var(--hair); color: var(--ice);
  font-family: var(--font-body); font-size: 16px;
  padding: 10px 14px;
}
.input:focus { outline: none; border-color: var(--cyan); }
.input-err { color: #FF9D9D; font-size: 13px; margin-top: 8px; }

.q-nav {
  display: flex; justify-content: space-between; gap: 12px;
  padding: 16px 22px 20px;
  border-top: 1px solid var(--hair);
}

/* 答题卡 */
.q-side { position: sticky; top: 76px; }
.q-side-k { font-size: 12px; color: var(--dim); letter-spacing: .12em; margin-bottom: 10px; }
.q-map { display: grid; grid-template-columns: repeat(5, 1fr); gap: 6px; margin-bottom: 16px; }
.q-cell {
  height: 36px; cursor: pointer;
  font-family: var(--font-mono); font-size: 12px;
  display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--hair); color: var(--dim); background: transparent;
  transition: border-color .12s, background .12s, color .12s;
}
.q-cell:hover { border-color: var(--cyan); color: var(--cyan); }
.q-cell.is-cur { border-color: var(--cyan); color: var(--deep); background: var(--cyan); font-weight: 700; }
.q-cell.is-done { color: var(--cyan); border-color: var(--royal); }
.q-cell.is-cur.is-done { color: var(--deep); }

/* ---------- 终端 ---------- */
.term-root { border: 1px solid var(--hair); background: #04032E; }
.term-screen {
  height: 240px; overflow-y: auto; padding: 12px 14px;
  font-size: 13.5px; line-height: 1.65; color: var(--cyan);
  white-space: pre-wrap; word-break: break-all;
}
.term-line { min-height: 1.2em; }
.term-echo { color: var(--dim); }
.term-input-row {
  display: flex; align-items: center; gap: 8px;
  border-top: 1px solid var(--hair);
  padding: 8px 14px;
}
.term-prompt { color: var(--cyan); flex: none; font-size: 13.5px; }
.term-input {
  flex: 1; background: transparent; border: none; outline: none;
  color: var(--ice); font-family: var(--font-mono); font-size: 13.5px;
  caret-color: var(--cyan);
}
.term-tools { display: flex; gap: 10px; margin-top: 10px; }
.term-tools .btn { min-height: 38px; padding: 6px 14px; font-size: 13px; }
.term-note { font-size: 13px; color: var(--dim); margin-top: 10px; }
.term-tasks { margin: 0 0 12px 18px; color: var(--ice); font-size: 14.5px; }
.term-tasks li { margin-bottom: 2px; }

/* ---------- 弹层 ---------- */
.modal {
  position: fixed; inset: 0; z-index: 90;
  display: flex; align-items: center; justify-content: center;
  background: rgba(0, 3, 46, .72);
  padding: 20px;
}
.modal-card { width: min(560px, 94vw); background: var(--deep); }
.modal-body { padding: 24px 24px 22px; }
.modal-title { font-size: 22px; font-weight: 800; margin-bottom: 12px; }
.modal-note { color: var(--dim); font-size: 14.5px; margin-bottom: 16px; }
.modal-btns { display: flex; gap: 12px; margin-top: 20px; flex-wrap: wrap; }
.modal-btns.modal-col { flex-direction: column; }
.modal-col .btn { width: 100%; }

.confirm-list { list-style: none; margin-bottom: 18px; }
.confirm-list li {
  padding: 10px 14px; margin-bottom: 8px;
  border: 1px solid var(--hair);
  font-size: 14.5px; color: var(--ice);
}
.confirm-list li b { color: var(--cyan); font-family: var(--font-mono); font-weight: 700; margin-right: 6px; }
.confirm-check {
  display: flex; gap: 10px; align-items: center; cursor: pointer;
  font-size: 14px; color: var(--ice);
}
.confirm-check input { width: 18px; height: 18px; accent-color: var(--royal); }

/* ---------- 全屏警示层 ---------- */
.shield {
  position: fixed; inset: 0; z-index: 95;
  background: var(--deep);
  display: flex; align-items: center; justify-content: center;
}
.shield-inner { text-align: center; padding: 24px; }
.shield-big { font-size: 26px; color: #FF9D9D; margin-bottom: 10px; letter-spacing: .1em; }
.shield-note { color: var(--dim); margin-bottom: 22px; }

/* ---------- 结果 ---------- */
.score-frame { margin-bottom: 28px; }
.score-body { padding: 26px 24px; text-align: center; }
.score-num { font-size: clamp(44px, 8vw, 72px); font-weight: 700; color: var(--cyan); line-height: 1.2; }
.score-sub { color: var(--dim); margin-top: 6px; }
.review-list { display: flex; flex-direction: column; gap: 14px; margin-bottom: 28px; }
.review-item { border: 1px solid var(--hair); background: var(--panel); }
.review-item.is-ok { border-left: 3px solid var(--cyan); }
.review-item.is-bad { border-left: 3px solid #FF9D9D; }
.review-head {
  display: flex; gap: 10px; align-items: baseline; flex-wrap: wrap;
  padding: 12px 16px; border-bottom: 1px solid rgba(255,255,255,.08);
}
.review-verdict { font-family: var(--font-mono); font-weight: 700; }
.is-ok .review-verdict { color: var(--cyan); }
.is-bad .review-verdict { color: #FF9D9D; }
.review-idx { font-family: var(--font-mono); color: var(--dim); font-size: 13px; }
.review-time { margin-left: auto; font-family: var(--font-mono); color: var(--dim); font-size: 12px; }
.review-body { padding: 14px 16px; }
.review-stem { margin-bottom: 12px; font-weight: 500; }
.review-line { font-size: 14.5px; margin-bottom: 6px; }
.review-line b { font-family: var(--font-mono); font-size: 12.5px; letter-spacing: .06em; margin-right: 8px; }
.review-line .ok { color: var(--cyan); }
.review-line .bad { color: #FF9D9D; }
.review-exp { margin-top: 10px; padding-top: 10px; border-top: 1px dashed var(--hair); color: var(--dim); font-size: 14px; }
.review-cmds {
  font-family: var(--font-mono); font-size: 12.5px; color: var(--cyan);
  background: #04032E; border: 1px solid var(--hair);
  padding: 8px 12px; margin-top: 8px; white-space: pre-wrap;
}
.result-top {
  display: grid; grid-template-columns: 300px minmax(0, 1fr);
  gap: 20px; align-items: start; margin-bottom: 28px;
}
.result-cta { display: flex; flex-direction: column; gap: 12px; }
.result-cta .btn { width: 100%; text-align: center; }
.result-map-body { padding: 16px; }
.result-map-body .q-side-k { margin-bottom: 12px; }
.result-map-body .rm-ok { color: var(--cyan); }
.result-map-body .rm-bad { color: #FF9D9D; }
.q-map-result { grid-template-columns: repeat(10, 1fr); gap: 6px; }
.q-map-result .q-cell { cursor: pointer; }
.q-map-result .q-cell.is-ok { color: var(--deep); background: rgba(143, 217, 255, .85); border-color: var(--cyan); font-weight: 700; }
.q-map-result .q-cell.is-ok:hover { background: #fff; border-color: #fff; }
.q-map-result .q-cell.is-bad { color: #FFD9D9; background: rgba(255, 157, 157, .16); border-color: #FF9D9D; }
.q-map-result .q-cell.is-bad:hover { color: #fff; border-color: #fff; }

/* ---------- Toast / 页脚 ---------- */
.toast {
  position: fixed; left: 50%; bottom: 32px; transform: translateX(-50%);
  z-index: 99; background: var(--cyan); color: var(--deep);
  font-size: 14px; padding: 10px 18px; max-width: 90vw;
  box-shadow: 0 6px 24px rgba(0, 0, 0, .4);
}
.foot {
  position: relative; z-index: 1;
  padding: 18px 24px; border-top: 1px solid var(--hair);
  color: var(--dim); font-size: 12px; text-align: center;
}

/* ---------- 错题本 ---------- */
.top-actions { margin-left: auto; display: flex; align-items: center; gap: 8px; }
.wb-btn { min-height: 36px; padding: 6px 14px; font-size: 13px; }
.wb-count { color: var(--cyan); margin-left: 6px; }
.book-tools { display: flex; gap: 8px; align-items: center; margin-bottom: 16px; flex-wrap: wrap; }
#wbList .review-item { animation: none; }
.wb-empty {
  border: 1px dashed var(--hair);
  color: var(--dim); text-align: center;
  padding: 42px 0; font-family: var(--font-mono); font-size: 14px;
}

/* ---------- 响应式 · 手机竖屏 ---------- */
@media (max-width: 900px) {
  .exam-grid { grid-template-columns: 1fr; max-width: 100%; padding-top: 14px; }
  .exam-grid > * { min-width: 0; }          /* 网格子项默认 min-width:auto 会撑破竖屏 */
  .q-panel, .q-side, .term-root, .term-screen, .term-input-row { max-width: 100%; }
  .q-side { position: static; }
  .diff-grid { grid-template-columns: 1fr; gap: 14px; margin-bottom: 40px; }
  .exam-hint { display: none; }
  .result-top { grid-template-columns: 1fr; }   /* 竖屏：按钮与题号一览上下排列 */
  .exam-submit { display: inline-block; margin-left: auto; min-height: 38px; padding: 6px 16px; font-size: 13px; }

  /* 考试中隐藏品牌顶栏，把 68px 让给计时条；计时条贴顶常驻 */
  body.is-exam .topbar { display: none; }
  .exam-bar {
    top: 0; gap: 12px; flex-wrap: nowrap;
    padding: 8px 14px;
    padding-top: calc(8px + env(safe-area-inset-top));
    padding-left: calc(14px + env(safe-area-inset-left));
    padding-right: calc(14px + env(safe-area-inset-right));
  }
  .exam-timer { font-size: 20px; min-width: 74px; }
  .exam-progress { font-size: 14px; letter-spacing: .04em; }
  .exam-viol { font-size: 12px; }
  #viewExam { padding-top: 0; }

  .wrap {
    padding-left: calc(16px + env(safe-area-inset-left));
    padding-right: calc(16px + env(safe-area-inset-right));
  }
  .view { padding: 24px 0 48px; }
  .topbar {
    height: calc(60px + env(safe-area-inset-top));
    padding-top: env(safe-area-inset-top);
    padding-left: calc(16px + env(safe-area-inset-left));
    padding-right: calc(16px + env(safe-area-inset-right));
  }
  .h1 { font-size: 32px; }
  .lead { margin-bottom: 28px; }

  .q-body { padding: 16px 14px 6px; min-height: 200px; }
  .q-stem { font-size: 16px; line-height: 1.8; margin-bottom: 16px; }
  .q-opt { padding: 12px 14px; }
  .q-nav { padding: 12px 14px 14px; }
  .q-nav .btn { flex: 1; padding: 10px 12px; }

  /* 答题卡：10 列更矮；30 题 3 行即可一屏收下 */
  .q-map { grid-template-columns: repeat(10, 1fr); gap: 5px; }
  .q-cell { height: 34px; font-size: 11px; }

  /* 终端：输入 16px 防 iOS 聚焦整页缩放；加高触摸区；重置键铺满 */
  .term-screen { height: min(240px, 34vh); font-size: 13px; }
  .term-input-row { padding: 10px 12px; }
  .term-input { font-size: 16px; min-height: 24px; }
  .term-prompt { font-size: 15px; }
  .term-tools .btn { flex: 1; }

  /* 排行榜：收窄内边距，四列尽量同屏 */
  .board th, .board td { padding: 9px 10px; }
  .board td.rank { width: 44px; }

  .review-cmds { overflow-wrap: anywhere; }
  .modal { padding: 14px 14px calc(14px + env(safe-area-inset-bottom)); padding-top: calc(14px + env(safe-area-inset-top)); }
  .modal-card { width: 100%; max-width: 100%; max-height: 88vh; overflow-y: auto; }
  .foot { padding-bottom: calc(18px + env(safe-area-inset-bottom)); }
}

@media (max-width: 560px) {
  .brand-logo { width: 34px; height: 34px; }
  .brand-text b { font-size: 15px; }
  .brand-text small { font-size: 10px; }
  .h1 { font-size: 28px; }
  .exam-timer { font-size: 19px; min-width: 68px; }
  .q-map { gap: 4px; }
  .q-cell { height: 32px; }
  .modal-btns { flex-direction: column; }
  .modal-btns .btn { width: 100%; }
  .result-cta { flex-direction: column; }
  .result-cta .btn, .result-cta a.btn { width: 100%; text-align: center; }
}