/* ===== 考试系统统一主题样式 (exam.css) =====
   所有考试页共用，跟随全局 [data-theme] 切换（亮/暗）。
   :root = 亮色（默认），[data-theme="dark"] = 暗色。
   修复：原先考试组件硬编码深色，主题切换无效（#5）。
*/

:root {
  --exam-bg: #eef2f7;
  --exam-card: #ffffff;
  --exam-card-2: #f1f4f9;
  --exam-card-soft: rgba(15,23,42,0.03);
  --exam-text: #1a1a2e;
  --exam-text-soft: #475569;
  --exam-text-dim: #64748b;
  --exam-muted: #94a3b8;
  --exam-muted-2: #64748b;
  --exam-border: #d0d5dd;
  --exam-accent: #2563eb;
  --exam-accent-2: #0ea5e9;
  --exam-accent-glow: rgba(37,99,235,0.3);
  --exam-accent-soft: rgba(37,99,235,0.10);
  --exam-accent-soft-2: rgba(37,99,235,0.16);
  --exam-bar: linear-gradient(135deg,#e2e8f0,#cbd5e1);
  --exam-input-bg: #ffffff;
  --exam-scrim: rgba(15,23,42,0.45);
  --exam-overlay: rgba(15,23,42,0.05);
  --exam-overlay-2: rgba(15,23,42,0.10);
  --exam-success: #10b981;
  --exam-danger: #ef4444;
  --exam-on-accent: #ffffff;
}
[data-theme="dark"] {
  --exam-bg: #0a0e1e;
  --exam-card: rgba(16,20,48,0.95);
  --exam-card-2: rgba(16,20,48,0.8);
  --exam-card-soft: rgba(16,20,48,0.5);
  --exam-text: #e2e8f0;
  --exam-text-soft: #b0b0d0;
  --exam-text-dim: #94a3b8;
  --exam-muted: #64748b;
  --exam-muted-2: #8080a0;
  --exam-border: rgba(0,240,255,0.2);
  --exam-accent: #00f0ff;
  --exam-accent-2: #4fc3f7;
  --exam-accent-glow: rgba(0,240,255,0.3);
  --exam-accent-soft: rgba(0,240,255,0.10);
  --exam-accent-soft-2: rgba(0,240,255,0.18);
  --exam-bar: linear-gradient(135deg,#1a1e3a,#2a2e5a);
  --exam-input-bg: rgba(0,0,0,0.3);
  --exam-scrim: rgba(0,0,0,0.7);
  --exam-overlay: rgba(255,255,255,0.06);
  --exam-overlay-2: rgba(255,255,255,0.12);
  --exam-success: #10b981;
  --exam-danger: #ef4444;
  --exam-on-accent: #0a0e1e;
}

/* ===== 通用 ===== */
/* 不污染全局 body —— 考试页统一加上 exam-page class 后生效 */
body.exam-page { background: var(--exam-bg); color: var(--exam-text); }
.exam-page .container { max-width: 1100px; margin: 0 auto; padding: 15px 20px; }
/* 仅 exam_entry 页没有 exam-page body class，但仍需保持视觉一致 */
body:not(.exam-page) .exam-container { background: var(--exam-bg); color: var(--exam-text); }

/* 【L1】考试页隐藏全局导航栏 + 滚动通告条，避免双层导航干扰专注；并归零全局 body padding-top */
body.exam-page { padding-top: 0 !important; }
body.exam-page .navbar-modern,
body.exam-page .announcement-ticker { display: none !important; }

/* 顶栏 + 语言切换（所有考试页共用） */
.top-bar { display: flex; justify-content: space-between; align-items: center; padding: 8px 24px; background: var(--exam-card); border-bottom: 1px solid var(--exam-border); flex-wrap: wrap; gap: 8px; }
.top-bar .left { display: flex; align-items: center; gap: 12px; }
.top-bar .left a { color: var(--exam-accent); text-decoration: none; font-size: 0.88rem; font-weight: 500; }
.top-bar .left a:hover { text-decoration: underline; }
/* 【V2】语言切换做醒目：放大、强调边框与高亮，避免用户找不到中英文切换 */
.lang-toggle { display: flex; gap: 8px; align-items: center; background: var(--exam-accent-soft); padding: 4px 8px; border-radius: 22px; border: 1px solid var(--exam-accent-soft-2); }
.lang-toggle::before { content: '🌐'; font-size: 1.2rem; margin-right: 2px; }
.lang-toggle a { padding: 7px 18px; border-radius: 18px; font-size: 1rem; font-weight: 700; text-decoration: none; transition: all 0.2s; white-space: nowrap; box-shadow: 0 1px 3px rgba(0,0,0,0.08); }
.lang-toggle a.active { background: var(--exam-accent); color: var(--exam-on-accent); cursor: default; box-shadow: 0 2px 10px var(--exam-accent-glow); }
.lang-toggle a.inactive { background: var(--exam-card); color: var(--exam-accent); border: 1.5px solid var(--exam-accent); }
.lang-toggle a.inactive:hover { background: var(--exam-accent-soft-2); }

/* ===== 入口页 (exam_entry) ===== */
.exam-container { max-width: 1000px; margin: 0 auto; padding: 20px; }
.exam-header { text-align: center; padding: 20px 20px 10px; }
.exam-header h1 { font-size: 1.5rem; color: var(--exam-accent); text-shadow: 0 0 30px var(--exam-accent-glow); margin-bottom: 5px; }
.exam-body { background: var(--exam-card); border: 1px solid var(--exam-border); border-radius: 20px; padding: 25px; }
.info-box { background: var(--exam-accent-soft); border-radius: 12px; padding: 18px; margin-bottom: 25px; }
.info-box strong { color: var(--exam-accent); }
.info-box ul { color: var(--exam-text-soft); font-size: 0.88rem; margin-bottom: 0; padding-left: 20px; }
.info-box ul li { margin-bottom: 4px; }
.module-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 14px; margin: 18px 0; }
.module-card { background: var(--exam-card-2); border: 1px solid var(--exam-border); border-radius: 15px; padding: 20px 14px; text-align: center; cursor: pointer; transition: all 0.3s ease; color: var(--exam-text); }
.module-card:hover { transform: translateY(-4px); border-color: var(--exam-accent); box-shadow: 0 8px 25px var(--exam-accent-glow); }
.module-card .icon { font-size: 2.3rem; margin-bottom: 10px; }
.module-card .name { font-size: 1.05rem; font-weight: 600; }
.module-card .desc { font-size: 0.78rem; color: var(--exam-text-dim); margin-top: 4px; line-height: 1.35;
    /* 【L5】多行截断，避免硬截断断词 */
    display: -webkit-box; -webkit-line-clamp: 2; line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.module-card .qcount { font-size: 0.72rem; color: var(--exam-muted); margin-top: 6px; }
.module-card.sms .icon { color: #4fc3f7; }
.module-card.solas .icon { color: #ff8a65; }
.module-card.marpol .icon { color: #81c784; }
.module-card.colreg .icon { color: #ffd54f; }
.module-card.nav .icon { color: #ce93d8; }

.modal-overlay { display: none; position: fixed; inset: 0; background: var(--exam-scrim); z-index: 999; align-items: center; justify-content: center; }
.modal-overlay.active { display: flex; }
.modal-box { background: var(--exam-bar); border: 1px solid var(--exam-border); border-radius: 18px; padding: 28px; width: 90%; max-width: 400px; }
.modal-box h3 { color: var(--exam-accent); margin-bottom: 18px; font-size: 1.15rem; text-align: center; }
.modal-box label { color: var(--exam-text-soft); font-size: 0.82rem; margin-bottom: 3px; display: block; }
.modal-box input, .modal-box select { width: 100%; padding: 9px 12px; margin-bottom: 14px; background: var(--exam-input-bg); border: 1px solid var(--exam-border); border-radius: 10px; color: var(--exam-text); font-size: 0.9rem; }
.modal-box input:focus, .modal-box select:focus { border-color: var(--exam-accent); outline: none; }
.modal-box .btn-row { display: flex; gap: 10px; justify-content: center; margin-top: 8px; }
.modal-box .btn { padding: 9px 28px; border-radius: 25px; border: none; cursor: pointer; font-weight: 600; }
.modal-box .btn-primary { background: var(--exam-accent); color: var(--exam-on-accent); }
.modal-box .btn-primary:hover { filter: brightness(1.08); }
.modal-box .btn-secondary { background: var(--exam-overlay); color: var(--exam-text-soft); }
.modal-box .btn-secondary:hover { background: var(--exam-overlay-2); }

/* ===== 答题页 (exam_take) ===== */
.timer-bar { position: sticky; top: 0; z-index: 100; background: var(--exam-bar); border-bottom: 1px solid var(--exam-border); padding: 8px 20px; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 6px; }
.timer-bar .info { font-size: 0.82rem; color: var(--exam-text-soft); }
.timer-display { font-size: 1.5rem; font-weight: bold; font-family: monospace; color: var(--exam-accent); text-shadow: 0 0 20px var(--exam-accent-glow); min-width: 105px; text-align: center; }
.timer-display.warning { color: var(--exam-danger); text-shadow: 0 0 20px rgba(239,68,68,0.3); animation: blink 1s infinite; }
@keyframes blink { 50% { opacity: 0.5; } }
.progress-dots { display: flex; flex-wrap: wrap; gap: 4px; padding: 6px 20px; background: var(--exam-card-soft); justify-content: center; }
.progress-dots .dot { width: 24px; height: 24px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 0.6rem; font-weight: 600; color: var(--exam-muted-2); background: transparent; border: 1px solid var(--exam-border); cursor: pointer; transition: all 0.2s; }
.progress-dots .dot.answered { background: var(--exam-accent-soft); border-color: var(--exam-accent); color: var(--exam-accent); }
.progress-dots .dot:hover { border-color: var(--exam-accent); }
.question-container { padding: 15px 20px; max-width: 900px; margin: 0 auto; }
.question-block { background: var(--exam-card-2); border: 1px solid var(--exam-border); border-radius: 12px; padding: 18px; margin-bottom: 16px; }
.question-block.answered { border-left: 4px solid var(--exam-accent-2); }
.question-block .q-num { font-size: 0.8rem; color: var(--exam-accent); font-weight: 600; background: var(--exam-accent-soft); padding: 2px 10px; border-radius: 20px; display: inline-block; margin-bottom: 8px; }
.question-block .q-text { font-size: 0.95rem; color: var(--exam-text); margin-bottom: 12px; line-height: 1.6; }
.options label { display: block; padding: 8px 12px; margin-bottom: 5px; border: 1px solid var(--exam-border); border-radius: 10px; cursor: pointer; transition: all 0.2s; color: var(--exam-text-soft); font-size: 0.9rem; }
.options label:hover { border-color: var(--exam-accent); background: var(--exam-accent-soft); }
.options label.selected { border-color: var(--exam-accent); background: var(--exam-accent-soft); }
/* 无障碍：保留 radio 可聚焦（clip 而非 display:none），支持键盘 Tab + 空格 (#10) */
.options input[type="radio"] { position: absolute; width: 1px; height: 1px; opacity: 0; }
.options input[type="radio"]:focus-visible + .ok { outline: 2px solid var(--exam-accent); outline-offset: 2px; }
.options .ok { display: inline-block; width: 22px; height: 22px; line-height: 22px; text-align: center; border-radius: 50%; background: var(--exam-accent-soft); color: var(--exam-accent); font-weight: 600; font-size: 0.75rem; margin-right: 6px; }
.options label.selected .ok { background: var(--exam-accent); color: var(--exam-on-accent); }
.options .ot { color: var(--exam-text); }
.submit-area { position: sticky; bottom: 0; background: var(--exam-bar); border-top: 1px solid var(--exam-border); padding: 10px 20px; display: flex; justify-content: space-between; align-items: center; gap: 15px; flex-wrap: wrap; }
.submit-area .stats { color: var(--exam-text-soft); font-size: 0.82rem; }
@media print { .timer-bar, .progress-dots, .submit-area, .top-bar { display: none !important; } }

/* 【L2】分页导航（步进式作答）：居中胶囊按钮 + 页码信息 */
.exam-pager { display: flex; justify-content: center; align-items: center; gap: 18px; padding: 14px; margin: 10px 0; background: var(--exam-card-soft); border-radius: 16px; flex-wrap: wrap; }
.pager-btn { display: inline-flex; align-items: center; gap: 6px; padding: 10px 24px; border-radius: 25px; border: 1px solid var(--exam-accent); background: var(--exam-accent); color: var(--exam-on-accent); font-size: 0.92rem; font-weight: 600; cursor: pointer; transition: all 0.2s cubic-bezier(0.16,1,0.3,1); box-shadow: 0 2px 10px var(--exam-accent-glow); }
.pager-btn:hover:not(:disabled) { filter: brightness(1.08); transform: translateY(-2px); }
.pager-btn:disabled { opacity: 0.4; cursor: not-allowed; box-shadow: none; background: var(--exam-card); color: var(--exam-muted); border-color: var(--exam-border); transform: none; }
.pager-info { font-size: 0.95rem; font-weight: 600; color: var(--exam-text); background: var(--exam-card); padding: 7px 18px; border-radius: 20px; border: 1px solid var(--exam-border); }

/* ===== 成绩页 (exam_result) ===== */
.score-card { text-align: center; padding: 30px 20px; background: var(--exam-card-2); border: 1px solid var(--exam-border); border-radius: 20px; margin-bottom: 25px; }
.score-circle { position: relative; width: 130px; height: 130px; margin: 0 auto 12px; }
.score-circle svg { width: 130px; height: 130px; transform: rotate(-90deg); }
.score-circle circle { fill: none; stroke-width: 10; cx: 65; cy: 65; r: 55; }
.score-circle .bg { stroke: var(--exam-accent-soft); }
.score-circle .fg { stroke: url(#scoreGrad); stroke-dasharray: 345.6; stroke-linecap: round; transition: stroke-dashoffset 1.5s ease; }
.score-circle .score-text { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; flex-direction: column; color: var(--exam-accent); }
.score-circle .score-text .num { font-size: 2.8rem; font-weight: bold; line-height: 1; }
.score-circle .score-text .unit { font-size: 0.85rem; color: var(--exam-text-soft); }
.result-badge { display: inline-block; padding: 5px 20px; border-radius: 25px; font-size: 1.1rem; font-weight: bold; margin-top: 8px; }
.result-badge.pass { background: rgba(16,185,129,0.15); color: #10b981; border: 1px solid rgba(16,185,129,0.3); }
.result-badge.fail { background: rgba(239,68,68,0.15); color: var(--exam-danger); border: 1px solid rgba(239,68,68,0.3); }
.stats { display: flex; justify-content: center; gap: 25px; flex-wrap: wrap; font-size: 0.9rem; margin: 12px 0; }
.stats span { background: var(--exam-accent-soft); padding: 6px 18px; border-radius: 20px; color: var(--exam-text-soft); }
.stats span strong { color: var(--exam-accent); }
.action-bar { display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; margin: 18px 0 25px; }
.review-block { background: var(--exam-card-2); border: 1px solid var(--exam-border); border-radius: 14px; padding: 16px; margin-bottom: 12px; }
.review-block.correct { border-left: 4px solid var(--exam-success); }
.review-block.wrong { border-left: 4px solid var(--exam-danger); }
.review-block .q-h { display: flex; gap: 8px; align-items: flex-start; }
.review-block .q-h .status { font-weight: bold; font-size: 1.1rem; margin-top: 1px; }
.review-block .q-h .status.right { color: var(--exam-success); }
.review-block .q-h .status.wrong { color: var(--exam-danger); }
.review-block .q-text { color: var(--exam-text); font-size: 0.92rem; margin-bottom: 8px; }
.review-block .ans-info { font-size: 0.82rem; line-height: 1.6; }
.review-block .ans-info .label { color: var(--exam-text-dim); }
.review-block .ans-info .val { color: var(--exam-text-soft); }
.review-block .ans-info .val.correct { color: var(--exam-success); }
.review-block .ans-info .val.wrong { color: var(--exam-danger); }
.review-block .expl { margin-top: 8px; padding: 8px; background: var(--exam-accent-soft); border-radius: 8px; font-size: 0.82rem; color: var(--exam-text-dim); }
@media print { body { background: var(--exam-bg); } .top-bar, .action-bar { display: none !important; } .score-card { border: 1px solid var(--exam-border); } .container { max-width: 100%; } }

/* ===== 历史页 (exam_history) ===== */
h4 { color: var(--exam-accent); margin-bottom: 16px; font-size: 1.2rem; }
.filter-bar { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin-bottom: 16px; }
.filter-bar select { background: var(--exam-card-2); border: 1px solid var(--exam-border); border-radius: 10px; padding: 6px 12px; color: var(--exam-text); font-size: 0.85rem; }
.filter-bar .btn-filter { background: var(--exam-accent-soft); border: 1px solid var(--exam-border); border-radius: 10px; padding: 6px 18px; color: var(--exam-accent); cursor: pointer; font-size: 0.85rem; }
.filter-bar .btn-filter:hover { background: var(--exam-accent-soft-2); }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: center; padding: 10px 8px; font-size: 0.82rem; }
th { color: var(--exam-accent); font-weight: 600; background: var(--exam-accent-soft); }
td { color: var(--exam-text-soft); }
tr:hover td { background: var(--exam-accent-soft); }
.badge-pass { display: inline-block; padding: 2px 10px; border-radius: 20px; background: rgba(16,185,129,0.15); color: #10b981; font-size: 0.75rem; font-weight: 600; }
.badge-fail { display: inline-block; padding: 2px 10px; border-radius: 20px; background: rgba(239,68,68,0.15); color: var(--exam-danger); font-size: 0.75rem; font-weight: 600; }
.pagination { display: flex; justify-content: center; gap: 8px; margin-top: 20px; flex-wrap: wrap; }
.pagination a, .pagination span { padding: 5px 14px; border-radius: 20px; font-size: 0.82rem; text-decoration: none; }
.pagination a { background: var(--exam-accent-soft); color: var(--exam-accent); }
.pagination a:hover { background: var(--exam-accent-soft-2); }
.pagination .active { background: var(--exam-accent); color: var(--exam-on-accent); border: 1px solid var(--exam-accent); }