a, a:visited { text-decoration: none; color: inherit; }
/* 软考助手 v2 — 精致学习型设计 */
:root {
    --bg:        #f5f5f7;
    --card:      #ffffff;
    --primary:   #50b8d8;
    --primary-dim: #3a9dbd;
    --primary-bg:#edf7fb;
    --text:      #1e293b;
    --text-2:    #475569;
    --text-3:    #94a3b8;
    --border:    #e8ecf1;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
    --shadow:    0 1px 3px rgba(0,0,0,0.05), 0 2px 8px rgba(0,0,0,0.04);
    --shadow-lg: 0 2px 6px rgba(0,0,0,0.06), 0 8px 24px rgba(0,0,0,0.05);
    --radius:    10px;
    --radius-sm: 6px;
    --good:      #86c98b;
    --warn:      #e8b44d;
    --bad:       #d97171;
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html { font-size: 16px; -webkit-font-smoothing: antialiased; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Microsoft YaHei", sans-serif;
    font-size: 16px;
    line-height: 1.65;
    color: var(--text);
    background: var(--bg);
}

/* === 导航 === */
.top-nav {
    background: rgba(255,255,255,0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(0,0,0,0.06);
    position: sticky; top: 0; z-index: 100;
}
.nav-inner {
    max-width: 1100px; margin: 0 auto;
    display: flex; justify-content: space-between; align-items: center;
    height: 52px; padding: 0 24px;
}
.logo {
    font-size: 16px; font-weight: 600; color: var(--text); text-decoration: none;
    display: flex; align-items: center; gap: 8px;
}
.logo::before { content: "📚"; font-size: 18px; }
.nav-links { display: flex; gap: 2px; }
.nav-links a {
    padding: 6px 14px; border-radius: var(--radius-sm);
    text-decoration: none; color: var(--text-2); font-size: 15px;
    transition: all 0.18s;
}
.nav-links a:hover { background: #f1f5f9; color: var(--text); }
.nav-links a.active { background: var(--primary-bg); color: var(--primary-dim); font-weight: 500; }

/* === 容器 === */
.container { max-width: 1100px; margin: 0 auto; padding: 28px 24px 60px; }

/* === 标题 === */
h1 { font-size: 22px; font-weight: 600; letter-spacing: -0.3px; margin-bottom: 4px; }
h2 { font-size: 17px; font-weight: 600; margin-bottom: 16px; color: var(--text); }
h3 { font-size: 16px; font-weight: 500; }
.section-desc { color: var(--text-2); font-size: 16px; margin-bottom: 24px; }

/* === 卡片 === */
.card {
    background: var(--card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 22px 24px;
    margin-bottom: 18px; box-shadow: var(--shadow-sm);
}

/* === 统计卡片行 === */
.stats-row {
    display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-bottom: 22px;
}
.stat-card {
    background: var(--card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 20px 22px;
    text-align: left; box-shadow: var(--shadow-sm);
    transition: box-shadow 0.2s;
}
.stat-card:hover { box-shadow: var(--shadow); }
.stat-num { font-size: 34px; font-weight: 700; color: var(--text); letter-spacing: -1px; line-height: 1.1; }
.stat-label { font-size: 14px; color: var(--text-3); margin-top: 4px; }
.stat-card .stat-icon { font-size: 20px; margin-bottom: 6px; display: block; }

/* === 阶段横幅 === */
.stage-banner {
    background: var(--primary-bg); border: 1px solid rgba(80,184,216,0.2);
    border-radius: var(--radius); padding: 14px 20px;
    margin-bottom: 20px; color: var(--primary-dim);
    font-size: 16px; line-height: 1.6;
}
.stage-banner strong { font-weight: 600; }

/* === 按钮 === */
.btn {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 10px 20px; border-radius: var(--radius-sm);
    font-size: 15px; font-weight: 500; border: none; cursor: pointer;
    text-decoration: none; transition: all 0.18s; font-family: inherit;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dim); box-shadow: var(--shadow); }
.btn-outline { background: #fff; color: var(--text-2); border: 1px solid var(--border); }
.btn-outline:hover { border-color: var(--primary); color: var(--primary-dim); background: var(--primary-bg); }
.btn-success { background: var(--good); color: #fff; }
.btn-danger { background: var(--bad); color: #fff; }
.btn-sm { padding: 5px 12px; font-size: 14px; border-radius: 5px; cursor: pointer; font-family: inherit; }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }
.task-actions { display: flex; gap: 10px; margin-top: 16px; flex-wrap: wrap; }

/* === 进度条 === */
.progress-bar { flex: 1; height: 6px; background: #eef1f5; border-radius: 3px; min-width: 80px; overflow: hidden; }
.progress-fill { height: 100%; background: var(--primary); border-radius: 3px; transition: width 0.5s ease; }

/* === 章节列表 === */
.chapter-grid { display: grid; gap: 10px; }
.chapter-item {
    display: flex; align-items: center; gap: 14px;
    padding: 6px 0;
}
.chapter-name {
    width: 210px; font-size: 14px; color: var(--text);
    display: flex; align-items: center; gap: 8px;
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.ch-num {
    width: 26px; height: 26px; display: inline-flex; align-items: center; justify-content: center;
    background: #f1f5f9; border-radius: 5px;
    font-size: 12px; font-weight: 600; color: var(--text-2); flex-shrink: 0;
}
.chapter-stat { width: 42px; text-align: right; font-size: 13px; color: var(--text-3); }

/* === 双栏 === */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }

/* === 错题列表 === */
.error-list { list-style: none; }
.error-list li {
    padding: 11px 0; border-bottom: 1px solid var(--border);
    font-size: 15px; display: flex; align-items: flex-start; gap: 8px;
}
.err-count {
    display: inline-flex; align-items: center; justify-content: center;
    min-width: 24px; height: 24px; background: #fef0f0; color: var(--bad);
    border-radius: 5px; font-weight: 600; font-size: 12px; flex-shrink: 0;
}
.err-date { color: var(--text-3); font-size: 13px; margin-left: auto; white-space: nowrap; }

/* === 文字辅助 === */
.link-more { color: var(--primary-dim); text-decoration: none; font-size: 15px; }
.link-more:hover { text-decoration: underline; }
.empty-msg { color: var(--text-3); font-size: 16px; padding: 32px 0; text-align: center; }
.success-msg { color: var(--good); font-weight: 500; }
.badge {
.badge-judge { background:#e8f5e9; color:#2e7d32; padding:2px 8px; border-radius:4px; font-size:12px; font-weight:600; margin-right:8px; }
    display: inline-flex; align-items: center;
    background: #fef0f0; color: var(--bad); padding: 1px 8px;
    border-radius: 10px; font-size: 13px; font-weight: 500;
}

/* === 考试分数 === */
.exam-score { text-align: center; padding: 16px 0; }
.big-score { font-size: 52px; font-weight: 700; color: var(--primary); letter-spacing: -2px; }
.score-label { color: var(--text-3); font-size: 15px; margin-top: 4px; }

/* === 章节标签 === */
.chapter-select { display: flex; flex-wrap: wrap; gap: 8px; margin: 18px 0 26px; }
.ch-tag {
    display: inline-block; padding: 7px 14px; border: 1px solid var(--border);
    border-radius: 7px; text-decoration: none; color: var(--text-2); font-size: 15px;
    transition: all 0.15s;
}
.ch-tag:hover { border-color: var(--primary); color: var(--primary-dim); background: var(--primary-bg); }
.ch-tag.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.ch-tag small { color: var(--text-3); font-size: 13px; }

/* === 知识点卡片 === */
.kp-grid { display: grid; gap: 11px; }
.section-divider {
    font-size: 17px; font-weight: 700; color: var(--text);
    padding: 24px 0 10px; margin: 0 0 8px;
    border-bottom: none;
    position: relative;
}
.section-divider::after {
    content: "";
    position: absolute; left: 0; bottom: 0;
    width: 48px; height: 3px;
    background: linear-gradient(90deg, var(--primary), transparent);
    border-radius: 2px;
}
.kp-card {
    background: var(--card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 18px 20px;
    transition: box-shadow 0.2s;
}
.kp-card:hover { box-shadow: var(--shadow); }
.kp-card.kp-key { border-left: 3px solid var(--warn); }
.kp-card.kp-mastered { opacity: 0.55; background: #f8faf9; border-color: #dce8e2; }
.kp-header { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }
.kp-title { font-weight: 600; font-size: 16px; color: var(--text); }
.kp-badge { background: #fef7e6; color: #b07d1a; padding: 2px 8px; border-radius: 4px; font-size: 12px; font-weight: 500; }
.kp-diff { color: var(--text-3); font-size: 13px; margin-left: auto; }
.kp-content { font-size: 15px; color: var(--text-2); line-height: 1.75; }
.kp-actions { display: flex; gap: 8px; margin-top: 14px; }

/* === 侧栏布局 === */
.study-layout { display: grid; grid-template-columns: 220px 1fr; gap: 26px; }
.study-sidebar { position: sticky; top: 72px; align-self: start; }
.study-main { min-width: 0; }
.sidebar-link {
    display: block; padding: 7px 12px; border-radius: 6px;
    text-decoration: none; color: var(--text-2); font-size: 15px;
    transition: all 0.12s;
}
.sidebar-link:hover { background: #f1f5f9; color: var(--text); }
.sidebar-link.active { background: var(--primary-bg); color: var(--primary-dim); font-weight: 500; }
.sidebar-link.sub { padding-left: 22px; font-size: 14px; }
.sidebar-chapter { font-size: 13px; font-weight: 600; color: var(--text-3); padding: 10px 12px 4px; }
.sidebar h3 { font-size: 13px; color: var(--text-3); letter-spacing: 0.4px; padding: 0 12px; margin: 14px 0 4px; }

/* === 题目卡片 === */
.quiz-card {
    background: var(--card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 26px 28px; margin-bottom: 16px;
    box-shadow: var(--shadow-sm);
}
.quiz-header {
    display: flex; justify-content: space-between; align-items: center;
    margin-bottom: 18px; padding-bottom: 14px; border-bottom: 1px solid var(--border);
}
.quiz-num { font-weight: 600; font-size: 15px; color: var(--primary-dim); }
.quiz-difficulty { font-size: 13px; }
.quiz-content { font-size: 16px; line-height: 1.85; margin-bottom: 22px; color: var(--text); }
.quiz-options { display: grid; gap: 9px; }
.quiz-option {
    display: block; width: 100%; text-align: left;
    padding: 13px 18px; border: 1px solid var(--border); border-radius: 8px;
    background: #fff; font-size: 16px; cursor: pointer;
    transition: all 0.15s; font-family: inherit; color: var(--text);
}
.quiz-option:hover { border-color: var(--primary); background: var(--primary-bg); }
.quiz-option.selected { border-color: var(--primary); background: var(--primary-bg); }
.quiz-option.correct { border-color: var(--good); background: #f2faf3; color: #2d6a35; }
.quiz-option.wrong { border-color: var(--bad); background: #fef5f5; color: #8b3535; }
.quiz-option.disabled { opacity: 0.5; }
.quiz-explanation {
    background: #f8fafc; border: 1px solid var(--border); border-radius: 8px;
    padding: 16px 18px; margin-top: 18px; font-size: 15px; line-height: 1.75; color: var(--text-2);
}
.quiz-explanation strong { color: var(--text); }
.quiz-nav { display: flex; gap: 10px; margin-top: 22px; justify-content: center; }
.study-info { color: var(--text-3); margin-bottom: 18px; }

/* === 考试计时器 === */
.exam-timer {
    position: sticky; top: 0; z-index: 99;
    background: #1e293b; color: #e2e8f0;
    padding: 12px 24px; display: flex; justify-content: space-between; align-items: center;
}
.exam-timer .time { font-size: 30px; font-weight: 600; font-variant-numeric: tabular-nums; }
.exam-timer .time.warning { color: var(--warn); }
.exam-timer .time.danger { color: var(--bad); }
.exam-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(30px, 1fr)); gap: 5px; margin-top: 12px; }
.exam-grid a {
    display: flex; align-items: center; justify-content: center;
    width: 30px; height: 30px; border: 1px solid var(--border); border-radius: 5px;
    font-size: 13px; text-decoration: none; color: var(--text-2);
}
.exam-grid a.answered { background: var(--primary); color: #fff; border-color: var(--primary); }
.exam-grid a.current { border: 2px solid var(--primary); font-weight: 600; }
.exam-submit { text-align: center; margin: 28px 0; }

/* === 响应式 === */
@media (max-width: 768px) {
    .two-col, .stats-row { grid-template-columns: 1fr 1fr; }
    .study-layout { grid-template-columns: 1fr; }
    .study-sidebar { display: none; }
    .chapter-name { width: 140px; }
}
@media (max-width: 480px) {
    .stats-row { grid-template-columns: 1fr 1fr; gap: 8px; }
    .container { padding: 16px 12px 40px; }
    .nav-links a { font-size: 13px; padding: 5px 8px; }
    .quiz-card { padding: 18px 16px; }
    .kp-card { padding: 14px 16px; }
}

/* === 知识点增强渲染 === */
.kp-heading {
    font-size: 16px; font-weight: 600; color: var(--text);
    margin: 14px 0 8px; padding: 4px 0 6px;
    border-bottom: 1.5px solid var(--border);
}
.kp-para { margin: 4px 0; }
.kp-list-item { padding-left: 16px; position: relative; margin: 2px 0; }
.kp-list-item::before { content: "•"; position: absolute; left: 2px; color: var(--primary); }
.kp-list-num { padding-left: 28px; margin: 2px 0; }
.kp-num-label { display: inline-block; min-width: 20px; font-weight: 500; color: var(--primary-dim); margin-left: -28px; }
.kp-em {
    background: #f0f7ff; border-left: 3px solid var(--primary);
    padding: 8px 14px; margin: 8px 0; border-radius: 4px;
    font-size: 15px; color: var(--text-2);
}
.kp-spacer { height: 6px; }
.kp-hr { border: none; border-top: 1px solid var(--border); margin: 10px 0; }
.kp-table-wrap { overflow-x: auto; margin: 10px 0; }
.kp-table {
    width: 100%; border-collapse: collapse; font-size: 14px; line-height: 1.6;
    border: 1px solid var(--border); border-radius: 6px; overflow: hidden;
}
.kp-table th {
    background: var(--primary-bg); color: var(--primary-dim);
    font-weight: 600; padding: 8px 12px; text-align: left;
    border-bottom: 1px solid var(--border);
}
.kp-table td {
    padding: 7px 12px; border-bottom: 1px solid #f0f2f5;
    color: var(--text-2);
}
.kp-table tr:last-child td { border-bottom: none; }
.kp-table tr:hover td { background: #f8fafc; }

/* === 答题解析增强 === */
.exp-result { margin-bottom: 8px; }
.exp-correct { font-size: 17px; font-weight: 600; color: var(--good); }
.exp-wrong { font-size: 17px; font-weight: 600; color: var(--bad); }
.exp-answer { margin-bottom: 6px; color: var(--text); font-size: 15px; }
.exp-brief { color: var(--text-2); padding: 4px 0; }
.exp-analysis { margin-top: 12px; border-top: 1px solid var(--border); padding-top: 10px; }
.analysis-title { font-weight: 600; font-size: 15px; color: var(--text); margin-bottom: 8px; }
.analysis-item {
    padding: 8px 12px; border-radius: 6px; margin-bottom: 6px;
    border: 1px solid var(--border); font-size: 14px; line-height: 1.6;
}
.analysis-correct { background: #f2faf3; border-color: #c8e6c9; }
.analysis-wrong { background: #fef5f5; border-color: #f5c6cb; }
.analysis-option {
    display: inline-block; width: 20px; height: 20px; line-height: 20px;
    text-align: center; border-radius: 4px; font-weight: 700; font-size: 13px;
    margin-right: 8px; flex-shrink: 0;
}
.analysis-correct .analysis-option { background: var(--good); color: #fff; }
.analysis-wrong .analysis-option { background: var(--bad); color: #fff; }
.analysis-text { font-weight: 500; color: var(--text); }
.analysis-detail { color: var(--text-2); margin-top: 4px; padding-left: 28px; font-size: 14px; }

/* === 知识点增强渲染 === */
.kp-heading {
    font-size: 16px; font-weight: 600; color: var(--text);
    margin: 14px 0 8px; padding: 4px 0 6px;
    border-bottom: 1.5px solid var(--border);
}
.kp-para { margin: 4px 0; }
.kp-list-item { padding-left: 16px; position: relative; margin: 2px 0; }
.kp-list-item::before { content: "\2022"; position: absolute; left: 2px; color: var(--primary); }
.kp-list-num { padding-left: 28px; margin: 2px 0; }
.kp-num-label { display: inline-block; min-width: 20px; font-weight: 500; color: var(--primary-dim); margin-left: -28px; }
.kp-em {
    background: #f0f7ff; border-left: 3px solid var(--primary);
    padding: 8px 14px; margin: 8px 0; border-radius: 4px;
    font-size: 15px; color: var(--text-2);
}
.kp-spacer { height: 6px; }
.kp-hr { border: none; border-top: 1px solid var(--border); margin: 10px 0; }
.kp-table-wrap { overflow-x: auto; margin: 10px 0; }
.kp-table {
    width: 100%; border-collapse: collapse; font-size: 14px; line-height: 1.6;
    border: 1px solid var(--border); border-radius: 6px; overflow: hidden;
}
.kp-table th {
    background: var(--primary-bg); color: var(--primary-dim);
    font-weight: 600; padding: 8px 12px; text-align: left;
    border-bottom: 1px solid var(--border);
}
.kp-table td {
    padding: 7px 12px; border-bottom: 1px solid #f0f2f5;
    color: var(--text-2);
}
.kp-table tr:last-child td { border-bottom: none; }
.kp-table tr:hover td { background: #f8fafc; }

/* === 答题解析增强 === */
.exp-result { margin-bottom: 8px; }
.exp-correct { font-size: 17px; font-weight: 600; color: var(--good); }
.exp-wrong { font-size: 17px; font-weight: 600; color: var(--bad); }
.exp-answer { margin-bottom: 6px; color: var(--text); font-size: 15px; }
.exp-brief { color: var(--text-2); padding: 4px 0; }
.exp-analysis { margin-top: 12px; border-top: 1px solid var(--border); padding-top: 10px; }
.analysis-title { font-weight: 600; font-size: 15px; color: var(--text); margin-bottom: 8px; }
.analysis-item {
    padding: 8px 12px; border-radius: 6px; margin-bottom: 6px;
    border: 1px solid var(--border); font-size: 14px; line-height: 1.6;
}
.analysis-correct { background: #f2faf3; border-color: #c8e6c9; }
.analysis-wrong { background: #fef5f5; border-color: #f5c6cb; }
.analysis-option {
    display: inline-block; width: 20px; height: 20px; line-height: 20px;
    text-align: center; border-radius: 4px; font-weight: 700; font-size: 13px;
    margin-right: 8px; flex-shrink: 0;
}
.analysis-correct .analysis-option { background: var(--good); color: #fff; }
.analysis-wrong .analysis-option { background: var(--bad); color: #fff; }
.analysis-text { font-weight: 500; color: var(--text); }
.analysis-detail { color: var(--text-2); margin-top: 4px; padding-left: 28px; font-size: 14px; }