/* ============ CSP-J/S 初赛训练营 ============ */
:root {
  --bg: #f4f6fb;
  --card: #ffffff;
  --ink: #1e2430;
  --muted: #6b7484;
  --line: #e3e8f0;
  --brand: #3b5bdb;
  --brand-2: #4c6ef5;
  --ok: #2f9e44;
  --ok-bg: #ebfbee;
  --bad: #e03131;
  --bad-bg: #fff5f5;
  --warn: #f08c00;
  --code-bg: #1e293b;
  --code-ink: #e2e8f0;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(30, 41, 59, .08), 0 4px 14px rgba(30, 41, 59, .05);
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.65;
  font-size: 15.5px;
}
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
b { font-weight: 600; }

/* ---------- 顶栏 ---------- */
#topbar {
  position: sticky; top: 0; z-index: 50;
  background: #fff;
  border-bottom: 1px solid var(--line);
  box-shadow: 0 1px 6px rgba(30,41,59,.06);
}
.topbar-inner {
  max-width: 1080px; margin: 0 auto; padding: 10px 16px;
  display: flex; align-items: center; gap: 16px;
}
.brand {
  font-size: 18px; font-weight: 700; color: var(--ink); white-space: nowrap;
}
.brand:hover { text-decoration: none; }
.global-progress { flex: 1; min-width: 120px; }
.gp-bar {
  height: 14px; border-radius: 999px; background: #e9edf5; overflow: hidden;
  border: 1px solid var(--line);
}
.gp-fill {
  height: 100%; width: 0%;
  background: linear-gradient(90deg, #4c6ef5, #22b8cf, #40c057);
  border-radius: 999px;
  transition: width .5s ease;
}
.gp-text { font-size: 12.5px; color: var(--muted); margin-top: 3px; }
.tabs {
  max-width: 1080px; margin: 0 auto; padding: 0 16px;
  display: flex; gap: 4px;
}
.tabs a {
  padding: 7px 14px; color: var(--muted); font-size: 14.5px; font-weight: 500;
  border-bottom: 2.5px solid transparent;
}
.tabs a:hover { text-decoration: none; color: var(--brand); }
.tabs a.active { color: var(--brand); border-bottom-color: var(--brand); font-weight: 600; }
.wrong-badge {
  display: inline-block; min-width: 18px; padding: 0 5px; margin-left: 2px;
  background: var(--bad); color: #fff; border-radius: 999px;
  font-size: 11.5px; text-align: center; line-height: 18px;
}
.wrong-badge:empty { display: none; }

/* ---------- 布局与卡片 ---------- */
#app { max-width: 1080px; margin: 18px auto 40px; padding: 0 16px; }
.view { display: none; }
.view.active { display: block; }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 20px 22px; margin-bottom: 18px;
}
.card h2 { margin: 0 0 12px; font-size: 19px; }
.card h3 { margin: 0 0 10px; font-size: 16.5px; }
.muted { color: var(--muted); font-size: 14px; }

/* ---------- 首页 hero ---------- */
.hero { display: flex; gap: 24px; align-items: stretch; flex-wrap: wrap; }
.hero-left { flex: 1.4; min-width: 260px; }
.hero-left h1 { margin: 2px 0 8px; font-size: 24px; }
.hero-sub { color: var(--muted); margin: 0 0 12px; }
.countdown { display: flex; gap: 10px; flex-wrap: wrap; }
.cd-chip {
  background: #eef1fb; border: 1px solid #dbe1f7; color: #34406b;
  padding: 6px 12px; border-radius: 10px; font-size: 14px;
}
.cd-chip b { font-size: 18px; color: var(--brand); }
.hero-right { flex: 1; min-width: 250px; display: flex; }
.resume-box {
  flex: 1; background: linear-gradient(135deg, #edf2ff, #e7f5ff);
  border: 1px solid #d0dcf7; border-radius: var(--radius);
  padding: 16px 18px; display: flex; flex-direction: column; justify-content: center; gap: 8px;
}
.resume-box .rb-title { font-weight: 700; font-size: 16px; }
.resume-box .rb-pos { color: #41527e; font-size: 14px; }

/* ---------- 模块卡片 ---------- */
.group-title { margin: 22px 0 10px; font-size: 17px; font-weight: 700; }
.group-title .gt-note { font-weight: 400; color: var(--muted); font-size: 13.5px; margin-left: 8px; }
.mod-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(310px, 1fr)); gap: 14px; }
.mod-card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 15px 17px; cursor: pointer;
  transition: transform .12s ease, box-shadow .12s ease; position: relative;
}
.mod-card:hover { transform: translateY(-2px); box-shadow: 0 4px 18px rgba(30,41,59,.12); }
.mod-card .mc-top { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; }
.mod-card .mc-name { font-weight: 700; font-size: 15.5px; }
.mod-card .mc-freq { color: var(--warn); font-size: 12.5px; white-space: nowrap; }
.mod-card .mc-desc { color: var(--muted); font-size: 13px; margin: 6px 0 10px; min-height: 36px; }
.mod-card .mc-meta { display: flex; justify-content: space-between; font-size: 12.5px; color: var(--muted); margin-bottom: 6px; }
.mini-bar { height: 8px; background: #edf0f7; border-radius: 999px; overflow: hidden; }
.mini-fill { height: 100%; background: linear-gradient(90deg, #4c6ef5, #40c057); border-radius: 999px; }
.mc-done { position: absolute; top: -8px; right: -6px; font-size: 22px; }

/* ---------- 表格 ---------- */
table { width: 100%; border-collapse: collapse; margin: 10px 0; font-size: 14px; }
th, td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; }
th { background: #f2f5fc; font-weight: 600; }
tr:nth-child(even) td { background: #fafbfe; }
.table-scroll { overflow-x: auto; }

/* ---------- 训练页 ---------- */
.train-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 4px; }
.train-head h2 { margin: 0; font-size: 19px; }
.train-sub { color: var(--muted); font-size: 13.5px; margin: 4px 0 10px; }
.dots { display: flex; flex-wrap: wrap; gap: 5px; margin: 10px 0 2px; }
.dot {
  width: 26px; height: 26px; border-radius: 7px; border: 1px solid var(--line);
  background: #eef1f7; color: #7d879a; font-size: 11.5px;
  display: flex; align-items: center; justify-content: center; cursor: pointer; user-select: none;
}
.dot:hover { border-color: var(--brand); }
.dot.cur { outline: 2.5px solid var(--brand); outline-offset: 1px; }
.dot.ok { background: var(--ok-bg); color: var(--ok); border-color: #b2f2bb; }
.dot.bad { background: var(--bad-bg); color: var(--bad); border-color: #ffc9c9; }
.dot.part { background: #fff9db; color: #b08800; border-color: #ffe066; }

.q-meta { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-bottom: 8px; font-size: 12.5px; }
.lv { display: inline-block; padding: 1px 8px; border-radius: 999px; font-weight: 700; font-size: 12px; }
.lv-J { background: #e7f5ff; color: #1971c2; }
.lv-S { background: #fff0f6; color: #c2255c; }
.tag-chip { background: #f1f3f9; color: #5b657a; padding: 1px 9px; border-radius: 999px; }
.src-chip { color: var(--muted); }
.kind-chip { background: #fff4e6; color: #d9480f; padding: 1px 9px; border-radius: 999px; }

.q-stem { font-size: 16px; margin: 6px 0 14px; }
.q-stem code, .expl code, .q-sub code, td code, li code, p code {
  background: #f1f3f9; border: 1px solid #e3e8f0; border-radius: 5px;
  padding: 1px 5px; font-size: .92em;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}
pre.codeblock {
  background: var(--code-bg); color: var(--code-ink);
  border-radius: 10px; padding: 14px 0; overflow-x: auto;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 13.5px; line-height: 1.55; margin: 10px 0 16px;
  counter-reset: line;
}
pre.codeblock .cl {
  display: block; padding: 0 16px 0 0; white-space: pre;
}
pre.codeblock .cl::before {
  counter-increment: line; content: counter(line);
  display: inline-block; width: 40px; margin-right: 14px; padding-right: 8px;
  text-align: right; color: #64748b; border-right: 1px solid #334155;
  user-select: none;
}
.blank-mark { color: #fbbf24; font-weight: 700; }

.opts { display: flex; flex-direction: column; gap: 9px; margin: 10px 0; }
.opt {
  text-align: left; border: 1.5px solid var(--line); background: #fbfcfe;
  border-radius: 10px; padding: 10px 14px; font-size: 15px; cursor: pointer;
  font-family: inherit; color: var(--ink); line-height: 1.55; transition: border-color .1s, background .1s;
  display: flex; gap: 10px; align-items: baseline; width: 100%;
}
.opt:hover:not(:disabled) { border-color: var(--brand-2); background: #f5f8ff; }
.opt:disabled { cursor: default; }
.opt .ol { font-weight: 700; color: var(--brand); min-width: 18px; }
.opt.sel-ok { border-color: var(--ok); background: var(--ok-bg); }
.opt.sel-bad { border-color: var(--bad); background: var(--bad-bg); }
.opt.reveal-ok { border-color: var(--ok); background: var(--ok-bg); }
.opt.dim { opacity: .55; }
.opt code { background: rgba(120,130,160,.12); }
.opts.tf { flex-direction: row; }
.opts.tf .opt { flex: 1; justify-content: center; font-weight: 600; }

.verdict { font-weight: 700; font-size: 15.5px; margin: 10px 0 6px; }
.verdict.ok { color: var(--ok); }
.verdict.bad { color: var(--bad); }
.expl {
  background: #f8f9fd; border: 1px solid var(--line); border-left: 4px solid var(--brand-2);
  border-radius: 8px; padding: 12px 14px; font-size: 14.5px; margin: 8px 0 4px;
}
.expl .expl-tags { margin-top: 8px; display: flex; gap: 6px; flex-wrap: wrap; font-size: 12.5px; }

.q-sub { border-top: 1px dashed var(--line); padding: 14px 0 4px; margin-top: 12px; }
.q-sub .q-sub-stem { font-size: 15px; margin-bottom: 8px; }
.sub-idx { font-weight: 700; color: var(--brand); margin-right: 6px; }

.train-nav { display: flex; justify-content: space-between; gap: 10px; margin-top: 16px; }

/* ---------- 按钮 ---------- */
.btn {
  border: 1px solid var(--line); background: #fff; color: var(--ink);
  border-radius: 9px; padding: 8px 16px; font-size: 14.5px; cursor: pointer;
  font-family: inherit; font-weight: 500; transition: background .1s;
  white-space: nowrap;
}
.btn:hover { background: #f3f5fa; }
.btn-primary { background: var(--brand); border-color: var(--brand); color: #fff; }
.btn-primary:hover { background: #364fc7; }
.btn-danger { color: var(--bad); border-color: #ffc9c9; }
.btn-danger:hover { background: var(--bad-bg); }
.btn-big { padding: 10px 22px; font-size: 15.5px; font-weight: 600; }
.btn-row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 10px; }
.btn:disabled { opacity: .5; cursor: default; }

/* ---------- 正确率面板 ---------- */
.acc-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 10px; }
.acc-item { font-size: 13px; }
.acc-item .acc-name { display: flex; justify-content: space-between; color: var(--muted); margin-bottom: 3px; }

/* ---------- 错题本 ---------- */
.wrong-item { border-top: 1px solid var(--line); padding: 14px 0; }
.wrong-item:first-of-type { border-top: none; }
.wrong-empty { text-align: center; color: var(--muted); padding: 30px 0; font-size: 15px; }

/* ---------- 弹窗 ---------- */
.modal { position: fixed; inset: 0; background: rgba(20,25,40,.45); z-index: 100; display: flex; align-items: center; justify-content: center; padding: 16px; }
.modal.hidden { display: none; }
.modal-box { background: #fff; border-radius: 14px; padding: 20px 22px; max-width: 560px; width: 100%; max-height: 85vh; overflow: auto; }
.modal-box textarea { width: 100%; height: 140px; font-family: ui-monospace, Menlo, monospace; font-size: 12px; border: 1px solid var(--line); border-radius: 8px; padding: 8px; }

#pageFooter { text-align: center; color: var(--muted); font-size: 12.5px; padding: 18px 16px 30px; }

/* ---------- 移动端 ---------- */
@media (max-width: 720px) {
  body { font-size: 15px; }
  .topbar-inner { flex-wrap: wrap; gap: 8px; padding: 8px 12px; }
  .brand { font-size: 16px; }
  .global-progress { order: 3; flex-basis: 100%; }
  #btnContinue { margin-left: auto; padding: 6px 12px; font-size: 13.5px; }
  .card { padding: 15px 14px; }
  .hero-left h1 { font-size: 20px; }
  .opts.tf { flex-direction: column; }
  .train-nav .btn { flex: 1; }
  th, td { padding: 6px 7px; font-size: 13px; }
}