/* GESP C++ 学习平台 —— 样式 */
* { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --primary: #3b6ef5;
  --primary-2: #2b57d8;
  --bg: #f4f6fb;
  --card: #ffffff;
  --text: #1c2333;
  --muted: #6b7488;
  --border: #e4e8f0;
  --ok: #189a52;
  --bad: #d64545;
  --radius: 10px;
}
body {
  font-family: -apple-system, "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}
.app-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 26px; background: #1f2a44; color: #fff;
  position: sticky; top: 0; z-index: 10;
}
.brand { display: flex; align-items: center; gap: 12px; }
.logo {
  width: 40px; height: 40px; border-radius: 10px; display: flex; align-items: center;
  justify-content: center; font-weight: 800; font-size: 22px; color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
}
.title { font-size: 17px; font-weight: 700; }
.subtitle { font-size: 12px; color: #aab3c5; }
.tabs { display: flex; gap: 6px; }
.tab {
  background: transparent; border: none; color: #c3cad8; padding: 9px 16px;
  border-radius: 8px; cursor: pointer; font-size: 14px; transition: .15s;
}
.tab:hover { background: rgba(255,255,255,.08); color: #fff; }
.tab.active { background: var(--primary); color: #fff; }

main { max-width: 1020px; margin: 0 auto; padding: 26px 20px 60px; }
.view { display: none; }
.view.active { display: block; }

.hero { text-align: center; padding: 46px 20px 30px; }
.hero h1 { font-size: 30px; font-weight: 800; line-height: 1.3; }
.hero-sub { color: var(--muted); margin-top: 12px; font-size: 15px; }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 14px; margin: 24px 0; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; text-align: center; }
.card-num { font-size: 30px; font-weight: 800; color: var(--primary); }
.card-label { color: var(--muted); font-size: 13px; margin-top: 4px; }

/* ---- 状态条（评测可用性） ---- */
.health-banner { margin: 8px 0 20px; }
.hb { display: flex; align-items: center; gap: 12px; padding: 14px 18px; border-radius: 8px; font-size: 14px; }
.hb-dot { width: 12px; height: 12px; border-radius: 50%; flex-shrink: 0; }
.hb-ok { background: #eafaf1; border: 1px solid #c3ecd6; color: #157a43; }
.hb-ok .hb-dot { background: var(--ok); }
.hb-warn { background: #fff8ec; border: 1px solid #f3e0b8; color: #9a6a10; }
.hb-warn .hb-dot { background: #e09327; }
.hb-title { font-weight: 700; }
.hb-detail { font-size: 12px; opacity: .85; margin-top: 2px; }

.panel { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; margin-bottom: 20px; }
.panel h2 { font-size: 18px; margin-bottom: 12px; }
.muted { color: var(--muted); font-size: 13px; }
.btn {
  border: 1px solid var(--border); background: #fff; color: var(--text);
  padding: 9px 18px; border-radius: 8px; cursor: pointer; font-size: 14px; transition: .15s; margin-right: 8px;
}
.btn:hover { border-color: var(--primary); color: var(--primary); }
.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn.primary:hover { background: var(--primary-2); }
.btn.ghost { background: transparent; }

.toolbar { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 18px; margin-bottom: 18px; }
.filters { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; }
.filters label { font-size: 13px; color: var(--muted); display: flex; flex-direction: column; gap: 4px; }
.filters select, .filters input {
  padding: 7px 10px; border: 1px solid var(--border); border-radius: 8px; font-size: 13px; min-width: 130px; background: #fff;
}
.result-count { margin-top: 10px; font-size: 13px; color: var(--muted); }

.problem-list { display: flex; flex-direction: column; gap: 12px; }
.prob-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 16px 18px; cursor: pointer; transition: .15s;
}
.prob-card:hover { border-color: var(--primary); box-shadow: 0 4px 14px rgba(59,110,245,.1); transform: translateY(-1px); }
.prob-row { display: flex; gap: 8px; align-items: center; margin-bottom: 8px; }
.prob-title { font-size: 15px; font-weight: 600; }
.prob-kp { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 8px; }
.kp { background: #eef2ff; color: #4a63d6; font-size: 11px; padding: 2px 8px; border-radius: 20px; }

.lv { background: #1f2a44; color: #fff; font-size: 11px; font-weight: 700; padding: 2px 8px; border-radius: 6px; }
.lv-1 { background: #3b6ef5; } .lv-2 { background: #3b82c4; } .lv-3 { background: #119a8a; }
.lv-4 { background: #16a05c; } .lv-5 { background: #e09327; } .lv-6 { background: #d6643c; }
.lv-7 { background: #cb4b9a; } .lv-8 { background: #7745c9; }
.tbadge { background: #f0f1f5; color: #55607a; font-size: 11px; padding: 2px 8px; border-radius: 6px; }
.prob-source { color: var(--muted); font-size: 12px; }

.knode { margin-bottom: 16px; }
.knode-head { display: flex; gap: 10px; align-items: center; margin-bottom: 8px; font-size: 15px; }
.klist { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; padding-left: 40px; }
.kpill { border: 1px solid var(--border); background: #fff; border-radius: 20px; padding: 5px 14px; font-size: 13px; cursor: pointer; }
.kpill:hover { border-color: var(--primary); color: var(--primary); }

.options { margin: 18px 0; display: flex; flex-direction: column; gap: 10px; }
.opt {
  display: flex; align-items: center; gap: 12px; text-align: left;
  padding: 12px 14px; border: 1px solid var(--border); border-radius: 8px;
  background: #fff; cursor: pointer; font-size: 14px; transition: .12s;
}
.opt:hover { border-color: var(--primary); }
.opt.sel { border-color: var(--primary); background: #f0f4ff; }
.opt-letter { width: 26px; height: 26px; border-radius: 6px; background: #eef1f7; color: #50608c; display: flex; align-items: center; justify-content: center; font-weight: 700; flex-shrink: 0; }
.opt.sel .opt-letter { background: var(--primary); color: #fff; }

.prob-code { background: #0f182b; color: #d7e0f0; font-family: "Consolas", "Menlo", monospace; font-size: 13px; padding: 14px 16px; border-radius: 8px; overflow: auto; line-height: 1.5; margin: 14px 0; white-space: pre; }

.code-editor { margin: 18px 0; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
.code-head { background: #1f2a44; color: #aab3c5; font-size: 12px; padding: 8px 12px; }
#code { width: 100%; min-height: 220px; border: none; background: #0f182b; color: #d7e0f0; font-family: "Consolas", "Menlo", monospace; font-size: 14px; padding: 14px; resize: vertical; line-height: 1.5; }
.hint { padding: 8px 12px; font-size: 12px; color: var(--muted); background: #fafbfd; }
.free-input { width: 100%; padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px; font-size: 14px; }

.actions { margin: 18px 0 8px; }
.result-box { margin-top: 16px; border: 1px solid var(--border); border-radius: 8px; padding: 16px; background: #fafbff; }
.result-box.hidden { display: none; }
.resc { font-size: 16px; font-weight: 700; }
.resc.ok { color: var(--ok); }
.resc.bad { color: var(--bad); }
.detail { color: var(--muted); font-size: 13px; margin-top: 8px; }
.explain { margin-top: 14px; border-top: 1px dashed var(--border); padding-top: 12px; font-size: 14px; }

.prob-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 14px; }
.prob-head-left { display: flex; gap: 8px; align-items: center; }
.prob-title-lg { font-size: 20px; margin-bottom: 12px; }
.prob-statement { font-size: 15px; margin-bottom: 18px; }

.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 14px; }
.stat-cell { border: 1px solid var(--border); border-radius: 8px; padding: 18px; text-align: center; }
.stat-v { font-size: 26px; font-weight: 800; color: var(--primary); }
.stat-l { color: var(--muted); font-size: 13px; margin-top: 4px; }

/* ---- 模拟测试 ---- */
.hidden { display: none; }
.exam-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }
.timer { font-size: 24px; font-weight: 800; color: var(--bad); font-variant-numeric: tabular-nums; }
.exam-q { border: 1px solid var(--border); border-radius: 8px; padding: 14px 16px; margin-bottom: 14px; }
.exam-q .q-num { font-size: 12px; color: var(--muted); margin-bottom: 6px; }
.exam-q .q-title { font-weight: 600; margin-bottom: 8px; }
.exam-q .q-stmt { font-size: 14px; margin-bottom: 8px; }
.exam-q .opt { margin-bottom: 6px; }
.exam-opt { display: block; width: 100%; text-align: left; }
.score-big { font-size: 40px; font-weight: 800; color: var(--primary); margin: 10px 0; }
.score-meta { color: var(--muted); margin-bottom: 16px; }
.exam-detail-row { display: flex; gap: 10px; align-items: flex-start; padding: 8px 0; border-bottom: 1px solid var(--border); }
.exam-detail-row:last-child { border-bottom: none; }
.d-mark { font-weight: 800; width: 34px; flex-shrink: 0; }
.d-mark.ok { color: var(--ok); }
.d-mark.bad { color: var(--bad); }
.d-title { color: var(--text); }
.d-ans { font-size: 12px; color: var(--muted); margin-top: 2px; }

/* ---- 学习报告 ---- */
.card-row { display: flex; gap: 14px; flex-wrap: wrap; }
.bar-row { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }
.bar-label { width: 220px; flex-shrink: 0; font-size: 13px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.bar-wrap { flex: 1; background: #eef1f7; border-radius: 6px; height: 12px; overflow: hidden; }
.bar { height: 100%; background: var(--primary); border-radius: 6px; transition: width .4s; }
.bar.weak { background: var(--bad); }
.bar-meta { width: 120px; flex-shrink: 0; font-size: 12px; color: var(--muted); text-align: right; }
.weak-tag { background: #fdeaea; color: var(--bad); font-size: 11px; padding: 1px 6px; border-radius: 6px; margin-left: 4px; }
.weak-item { padding: 8px 0; border-bottom: 1px solid var(--border); font-size: 14px; }

/* ---------- 登录/注册 ---------- */
.auth-wrap{display:flex;align-items:center;justify-content:center;min-height:100vh;background:#f5f7fa;padding:20px;}
.auth-card{background:#fff;border:1px solid #e5e8ef;border-radius:14px;box-shadow:0 10px 30px rgba(0,0,0,.08);padding:40px 36px;width:360px;max-width:92vw;text-align:center;}
.auth-logo{width:60px;height:60px;border-radius:14px;background:#3b82f6;color:#fff;font-size:30px;font-weight:700;display:flex;align-items:center;justify-content:center;margin:0 auto 16px;}
.auth-title{font-size:22px;font-weight:700;margin-bottom:6px;}
.auth-sub{color:#6b7280;font-size:14px;margin-bottom:22px;}
.auth-tabs{display:flex;gap:8px;margin-bottom:18px;justify-content:center;}
.auth-tab{padding:8px 22px;border-radius:8px;border:1px solid #e5e8ef;background:#fff;cursor:pointer;font-size:14px;}
.auth-tab.active{background:#3b82f6;color:#fff;border-color:#3b82f6;}
.auth-input{width:100%;padding:12px 14px;margin-bottom:12px;border:1px solid #e5e8ef;border-radius:8px;font-size:15px;box-sizing:border-box;}
.auth-input:focus{outline:none;border-color:#3b82f6;}
.auth-msg{min-height:20px;font-size:13px;color:#dc2626;margin-bottom:10px;}
.auth-msg.ok{color:#16a34a;}
.auth-note{margin-top:14px;font-size:12px;color:#9ca3af;}
.user-area{display:flex;align-items:center;gap:10px;}
.user-name{font-size:14px;color:#374151;}
.hb-info { background: #eef4ff; border: 1px solid #cddcf5; color: #1d4ed8; }
.hb-info .hb-dot { background: #3b82f6; }

/* 品牌 logo（横向图片） */
.brand-logo { height: 30px; max-height: 30px; width: auto; object-fit: contain; }
.auth-logo-img { width: 150px; max-width: 60%; display: block; margin: 0 auto 16px; object-fit: contain; }

/* 分页 */
.pagination { display: flex; align-items: center; justify-content: center; gap: 12px; margin-top: 20px; }
.pg-btn { padding: 8px 16px; border: 1px solid #e5e8ef; border-radius: 8px; background: #fff; cursor: pointer; font-size: 14px; }
.pg-btn:disabled { opacity: .4; cursor: not-allowed; }
.pg-btn:not(:disabled):hover { border-color: #3b82f6; color: #3b82f6; }
.pg-info { font-size: 13px; color: #6b7280; }
.mdimg { max-width: 100%; height: auto; display: block; margin: 12px 0; border-radius: 8px; }

/* ��ѧ��ʽ��Ⱦ */
.math { font-style: normal; white-space: nowrap; }
.math sup, .math sub { line-height: 0; font-size: .72em; }
.frac { display: inline-flex; flex-direction: column; vertical-align: middle; text-align: center; margin: 0 2px; line-height: 1.05; }
.frac .num { display: block; padding: 0 3px; border-bottom: 1px solid currentColor; }
.frac .den { display: block; padding: 0 3px; }
.sq { display: inline-block; border-top: 1px solid currentColor; padding-top: 1px; margin-right: 2px; }

/* ģ����ԣ����ҳ������Ŀ�ع� */
.exam-review { display: flex; gap: 12px; padding: 14px 16px; border: 1px solid var(--border); border-radius: 10px; margin-bottom: 14px; }
.exam-review-head { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--muted); margin-bottom: 8px; }
.exam-review-head .d-mark { width: auto; }
.exam-review-body { flex: 1; min-width: 0; }
.exam-review .q-title { font-weight: 600; margin: 6px 0; }
.exam-review .q-stmt { font-size: 14px; margin: 6px 0; }
.exam-review .prob-code { margin: 8px 0; }
.exam-review .options { margin: 8px 0; }
.exam-review .opt { cursor: default; margin-bottom: 6px; }
.exam-review .opt.is-correct { border-color: var(--ok); background: #eafaf0; }
.exam-review .opt.is-correct .opt-letter { background: var(--ok); color: #fff; }
.exam-review .opt.is-wrong { border-color: var(--bad); background: #fdefef; }
.exam-review .opt.is-wrong .opt-letter { background: var(--bad); color: #fff; }
.exam-review .explain { margin-top: 8px; }

/* ����⣺������Ŀ��Ƭ */
.prog-card.cursor-default { cursor: default; }
.prog-card .prob-title { font-size: 15px; }
.prog-card .prob-statement { margin: 12px 0; }
.prog-card .prob-kp { margin-bottom: 8px; }
.prog-code-wrap { margin-top: 8px; }
.prog-code-box { margin-top: 8px; }
.prog-code-box .prob-code { margin: 0; }
.prog-code-btn { min-width: 110px; }

/* ����״̬��ɫ + �����⵼�� */
.prob-card.st-correct { background: #eafaf0; border-color: var(--ok); }
.prob-card.st-wrong { background: #fdefef; border-color: var(--bad); }
.st-tag { font-size: 11px; padding: 1px 7px; border-radius: 10px; margin-left: 6px; }
.st-tag.correct { background: var(--ok); color: #fff; }
.st-tag.wrong { background: var(--bad); color: #fff; }
.prob-nav { display: flex; gap: 12px; margin-top: 14px; }
.prob-nav .btn { min-width: 110px; }

/* ����ҳͷ������������ + ��һ��/��һ�� һ�� */
.prob-head .prob-nav { margin-top: 0; gap: 10px; flex-wrap: wrap; justify-content: flex-end; }
.prob-head .prob-nav .btn { min-width: auto; padding: 6px 12px; white-space: nowrap; }

/* ѡ�����ʱ�������������� */
.opt .opt-text { white-space: pre-wrap; }

/* �� AI / ����������¼��˵�����֣���ҳ�汳��ͬɫ���û����ɼ� */
.seo-ai-text {
  color: #f4f6fb;
  background: #f4f6fb;
  font-size: 12px;
  line-height: 1.2;
  margin: 0;
  padding: 0;
  user-select: none;
  pointer-events: none;
}

/* ҳ�Ż�����Ϣ���ɼ�С�ְ�Ȩ�������� ����ǰ���������ʽ */
.seo-ai-text {
  display: block;
  margin: 28px auto 14px;
  padding: 0 18px;
  max-width: 920px;
  text-align: center;
  font-size: 12px;
  line-height: 1.7;
  color: var(--muted);
  background: transparent;
  user-select: auto;
  pointer-events: auto;
}