/* ================================================================
   Online Question System — Modern Tech UI
   ================================================================ */

/* ---------- 基础重置 ---------- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #4f46e5;
    --primary-light: #6366f1;
    --primary-dark: #3730a3;
    --primary-bg: #eef2ff;
    --success: #10b981;
    --success-bg: #d1fae5;
    --danger: #ef4444;
    --danger-bg: #fee2e2;
    --warning: #f59e0b;
    --warning-bg: #fef3c7;
    --info: #06b6d4;
    --info-bg: #cffafe;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    --radius: 10px;
    --radius-sm: 6px;
    --shadow-sm: 0 1px 2px rgba(0,0,0,.04);
    --shadow: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
    --shadow-md: 0 4px 6px rgba(0,0,0,.04), 0 2px 4px rgba(0,0,0,.04);
    --shadow-lg: 0 10px 25px rgba(0,0,0,.06), 0 4px 10px rgba(0,0,0,.04);
    --transition: .2s ease;
}

body {
    font-family: "Inter", "Microsoft YaHei", "PingFang SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: linear-gradient(135deg, #f0f4ff 0%, #f8fafc 40%, #f1f5f9 100%);
    color: var(--gray-800);
    line-height: 1.65;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color var(--transition);
}
a:hover { color: var(--primary-dark); }

/* ---------- 导航栏 ---------- */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    color: #fff;
    padding: 0 36px;
    height: 56px;
    box-shadow: 0 2px 12px rgba(0,0,0,.15);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.navbar .brand {
    color: #fff;
    font-size: 18px;
    font-weight: 700;
    letter-spacing: -.3px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.navbar .brand::before {
    content: '';
    display: inline-block;
    width: 28px;
    height: 28px;
    background: linear-gradient(135deg, var(--primary-light), #818cf8);
    border-radius: 8px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-links a {
    color: #94a3b8;
    padding: 6px 14px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    transition: all var(--transition);
}

.nav-links a:hover {
    color: #fff;
    background: rgba(255,255,255,.08);
}

.nav-user {
    color: #94a3b8;
    font-size: 13px;
    padding: 0 8px;
    border-left: 1px solid rgba(255,255,255,.12);
    margin-left: 4px;
    padding-left: 14px;
}

/* ---------- 布局 ---------- */
.container {
    max-width: 1280px;
    margin: 28px auto;
    padding: 0 24px;
}

h2 {
    font-size: 22px;
    font-weight: 700;
    color: var(--gray-900);
    letter-spacing: -.3px;
}

h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--gray-800);
}

.muted {
    color: var(--gray-500);
    font-size: 13px;
}

.empty-tip {
    color: var(--gray-400);
    text-align: center;
    padding: 48px 0;
    font-size: 14px;
}

/* ---------- 提示条 ---------- */
.alert {
    padding: 12px 18px;
    border-radius: var(--radius-sm);
    margin-bottom: 18px;
    font-size: 14px;
    font-weight: 500;
    animation: slideDown .25s ease;
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-8px); }
    to   { opacity: 1; transform: translateY(0); }
}

.alert-success { background: var(--success-bg); color: #065f46; border-left: 4px solid var(--success); }
.alert-danger  { background: var(--danger-bg); color: #991b1b; border-left: 4px solid var(--danger); }
.alert-warning { background: var(--warning-bg); color: #92400e; border-left: 4px solid var(--warning); }

/* ---------- 按钮 ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 9px 18px;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    white-space: nowrap;
    transition: all var(--transition);
    user-select: none;
    line-height: 1.4;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: #fff;
    box-shadow: 0 2px 8px rgba(79,70,229,.25);
}
.btn-primary:hover { box-shadow: 0 4px 14px rgba(79,70,229,.35); }

.btn-secondary {
    background: var(--gray-100);
    color: var(--gray-700);
    border: 1px solid var(--gray-200);
}
.btn-secondary:hover { background: var(--gray-200); color: var(--gray-900); }

.btn-danger {
    background: linear-gradient(135deg, #ef4444, #f87171);
    color: #fff;
    box-shadow: 0 2px 8px rgba(239,68,68,.25);
}
.btn-danger:hover { box-shadow: 0 4px 14px rgba(239,68,68,.35); }

.btn-success {
    background: linear-gradient(135deg, var(--success), #34d399);
    color: #fff;
    box-shadow: 0 2px 8px rgba(16,185,129,.25);
}

.btn-warning { background: var(--warning); color: #fff; }
.btn-info    { background: var(--info); color: #fff; }
.btn-block   { width: 100%; }

.btn-sm {
    padding: 5px 12px;
    font-size: 13px;
}

/* ---------- 表单 ---------- */
.form-group {
    margin-bottom: 18px;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--gray-600);
    letter-spacing: .2px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 14px;
    border: 1.5px solid var(--gray-200);
    border-radius: var(--radius-sm);
    font-size: 14px;
    color: var(--gray-800);
    background: #fff;
    transition: all var(--transition);
    outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79,70,229,.1);
}

.form-group textarea { resize: vertical; min-height: 80px; }
.form-group select { cursor: pointer; }

.hint {
    font-size: 12px;
    color: var(--gray-400);
    margin-top: 4px;
}

.hint-inline {
    font-weight: normal;
    font-size: 12px;
    color: var(--gray-500);
    margin-left: 8px;
}

/* ---------- 登录/注册 ---------- */
.auth-card {
    max-width: 420px;
    margin: 80px auto;
    background: #fff;
    border-radius: var(--radius);
    padding: 40px 36px;
    box-shadow: var(--shadow-lg);
}

.auth-card h2 {
    text-align: center;
    margin-bottom: 28px;
}

.auth-tip {
    text-align: center;
    margin-top: 20px;
    font-size: 14px;
    color: var(--gray-500);
}

.form-card {
    max-width: 720px;
}

/* ---------- 卡片 ---------- */
.card {
    background: #fff;
    border-radius: var(--radius);
    padding: 22px;
    box-shadow: var(--shadow);
    transition: box-shadow var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 18px;
}

.card-grid .card {
    display: flex;
    flex-direction: column;
}

.card-grid .card .muted {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card h3 {
    margin-bottom: 10px;
}

.exam-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: auto;
    padding-top: 14px;
    gap: 10px;
    flex-wrap: wrap;
}

/* ---------- 统计 ---------- */
.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 18px;
    margin-bottom: 28px;
}

.stat-card {
    background: #fff;
    border-radius: var(--radius);
    padding: 24px 20px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: all var(--transition);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.stat-num {
    font-size: 34px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

.stat-label {
    color: var(--gray-500);
    font-size: 13px;
    margin-top: 4px;
    font-weight: 500;
}

/* ---------- 表格 ---------- */
.table {
    width: 100%;
    border-collapse: collapse;
    background: #fff;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-100);
}

.table th, .table td {
    padding: 11px 14px;
    text-align: left;
    font-size: 13px;
    border-bottom: 1px solid var(--gray-100);
}

.table th {
    background: var(--gray-50);
    color: var(--gray-600);
    font-weight: 600;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: .5px;
    white-space: nowrap;
}

.table tbody tr {
    transition: background var(--transition);
}

.table tbody tr:hover {
    background: #fafbff;
}

.table tbody tr:last-child td {
    border-bottom: none;
}

.score {
    font-weight: 700;
    color: var(--primary);
    font-size: 15px;
}

.actions {
    display: flex;
    gap: 4px;
    align-items: center;
    flex-wrap: nowrap;
    white-space: nowrap;
}

.actions form { display: inline; }

.table td.actions {
    white-space: nowrap;
}

.title-cell {
    max-width: 220px;
}

.title-truncate {
    display: inline-block;
    max-width: 220px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    vertical-align: middle;
    cursor: default;
}

.paper-used-hint {
    margin-left: 10px;
    font-size: 12px;
    color: var(--text-muted, #888);
}

.paper-used-hint .exam-link {
    color: var(--primary);
    text-decoration: none;
    border-bottom: 1px dashed var(--primary);
    margin: 0 2px;
}

.paper-used-hint .exam-link:hover {
    border-bottom-style: solid;
}

.nowrap { white-space: nowrap; }

/* ---------- 工具栏 ---------- */
.toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 0 0 16px;
    flex-wrap: wrap;
    gap: 12px;
}

.toolbar h2 { margin-bottom: 0; }

.toolbar-actions {
    display: flex;
    gap: 8px;
    align-items: center;
    flex-wrap: wrap;
}

.inline { display: inline; }

/* ---------- 徽标 ---------- */
.badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 999px;
    font-size: 11px;
    font-weight: 600;
    background: var(--gray-100);
    color: var(--gray-600);
    letter-spacing: .2px;
}

.badge-info    { background: var(--primary-bg); color: var(--primary-dark); }
.badge-success { background: var(--success-bg); color: #065f46; }
.badge-warning { background: var(--warning-bg); color: #92400e; }
.badge-danger  { background: var(--danger-bg); color: #991b1b; }

/* ---------- 考试答题 ---------- */
.exam-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}

.timer {
    background: linear-gradient(135deg, #ef4444, #f87171);
    color: #fff;
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    font-weight: 700;
    font-size: 16px;
    box-shadow: 0 2px 8px rgba(239,68,68,.3);
    letter-spacing: .5px;
}

.question-card {
    background: #fff;
    border-radius: var(--radius);
    padding: 22px;
    margin-bottom: 16px;
    box-shadow: var(--shadow);
    transition: all var(--transition);
}

.question-card:hover {
    box-shadow: var(--shadow-md);
}

.question-card.correct { border-left: 4px solid var(--success); }
.question-card.wrong   { border-left: 4px solid var(--danger); }

.question-title {
    font-weight: 700;
    margin-bottom: 14px;
    font-size: 15px;
    color: var(--gray-900);
}

.option {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 12px;
    margin: 2px 0;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: background var(--transition);
    font-size: 14px;
}

.option:hover { background: var(--gray-50); }

.option input {
    width: auto;
    accent-color: var(--primary);
}

.option-line {
    padding: 5px 0;
    font-size: 14px;
}

.text-correct { color: #16a34a; font-weight: 700; }

.text-wrong { color: #dc2626; font-weight: 700; }

.text-muted { color: var(--text-muted, #888); }

.tag {
    display: inline-block;
    font-size: 11px;
    padding: 1px 8px;
    border-radius: 10px;
    margin-left: 6px;
    font-weight: 600;
}

.tag-correct {
    background: #dcfce7;
    color: #15803d;
}

.tag-wrong {
    background: #fee2e2;
    color: #b91c1c;
}

.submit-bar {
    display: flex;
    gap: 14px;
    justify-content: center;
    margin: 28px 0;
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 14px;
}

.result-score {
    font-size: 20px;
    font-weight: 700;
}

/* ---------- 学生选择 ---------- */
.student-select-section {
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-sm);
    padding: 18px;
    background: var(--gray-50);
    max-height: 520px;
    overflow-y: auto;
}

.student-search-row { margin-bottom: 12px; }

.student-search-input {
    width: 100%;
    max-width: 400px;
    padding: 10px 14px;
    font-size: 14px;
    border: 1.5px solid var(--gray-200);
    border-radius: var(--radius-sm);
    outline: none;
    transition: all var(--transition);
    background: #fff;
}

.student-search-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79,70,229,.1);
}

.student-select-tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 14px;
}

.tab-btn.active {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: #fff;
}

.student-group { margin-bottom: 14px; }

.student-group-header {
    padding: 8px 4px;
    border-bottom: 1px solid var(--gray-200);
    margin-bottom: 6px;
}

.collapsible-header {
    cursor: pointer;
    user-select: none;
    transition: background var(--transition);
}

.collapsible-header:hover {
    background: var(--primary-bg);
    border-radius: 4px;
    padding-left: 8px;
}

.collapse-arrow {
    display: inline-block;
    width: 16px;
    font-size: 11px;
    color: var(--gray-500);
    transition: transform .2s;
}

.student-group-header .check-label { font-weight: 700; color: var(--gray-800); }

.student-group-list {
    display: flex;
    flex-wrap: wrap;
    gap: 6px 20px;
    padding: 6px 0;
}

.student-item {
    font-size: 13px;
    min-width: 210px;
}

.student-item .hint { color: var(--gray-400); }

.check-label {
    display: inline-flex !important;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    font-size: 14px;
    color: var(--gray-700);
    font-weight: normal;
}

.check-label input[type="checkbox"] {
    width: auto !important;
    margin: 0;
    accent-color: var(--primary);
}

/* ---------- 题目表单选项行 ---------- */
.option-row {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.option-row input[type="radio"],
.option-row input[type="checkbox"] {
    width: 20px;
    height: 20px;
    flex: 0 0 20px;
    margin: 0;
    cursor: pointer;
    accent-color: var(--primary);
}

.option-row input[type="text"] {
    flex: 1;
    margin: 0;
}

/* ---------- 页签 ---------- */
.tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 24px;
    border-bottom: 2px solid var(--gray-200);
}

.tab {
    padding: 10px 22px;
    border-radius: 8px 8px 0 0;
    color: var(--gray-500);
    font-weight: 500;
    font-size: 14px;
    transition: all var(--transition);
}

.tab:hover { color: var(--primary); background: var(--primary-bg); }

.tab.active {
    background: var(--primary);
    color: #fff;
    font-weight: 600;
}

/* ---------- 批量操作栏 ---------- */
.batch-bar {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 10px 16px;
    background: var(--warning-bg);
    border: 1px solid var(--warning);
    border-radius: var(--radius-sm);
    margin-bottom: 0;
    margin-top: 12px;
}

.batch-bar strong {
    color: #b45309;
    font-weight: 700;
}

/* ---------- 行内编辑 ---------- */
.edit-row td {
    padding: 14px;
    background: #f0f7ff;
    border-bottom: 2px solid var(--primary);
}

.inline-edit-form .form-row {
    display: flex;
    gap: 14px;
    align-items: flex-end;
    flex-wrap: wrap;
}

.inline-edit-form .form-group { margin-bottom: 0; }

.inline-edit-form .form-group label {
    font-size: 12px;
    margin-bottom: 3px;
}

.inline-edit-form .form-group input {
    width: 150px;
    padding: 7px 10px;
    font-size: 13px;
}

/* ---------- 通用布局 ---------- */
.form-row {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
}

.form-actions {
    display: flex;
    gap: 10px;
    margin-top: 14px;
    flex-wrap: wrap;
}

.btn.disabled,
.btn-sm.disabled {
    opacity: 0.4;
    pointer-events: none;
    cursor: not-allowed;
}

/* ---------- 学生筛选 & 分页 ---------- */
.filter-card {
    padding: 14px 18px;
    margin-bottom: 14px;
}

.filter-form .form-row {
    gap: 18px;
    align-items: flex-end;
    flex-wrap: wrap;
}

.filter-group label {
    font-size: 12px;
    margin-bottom: 3px;
    display: block;
    font-weight: 600;
    color: var(--gray-500);
}

.filter-group input {
    width: 150px;
    padding: 7px 10px;
    font-size: 13px;
    border: 1.5px solid var(--gray-200);
    border-radius: var(--radius-sm);
    transition: all var(--transition);
}

.filter-group input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79,70,229,.08);
}

.page-size-bar {
    font-size: 13px;
    color: var(--gray-500);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.page-size-bar a { color: var(--primary); font-weight: 600; }

.page-size-bar strong { color: var(--gray-800); }

.pagination {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.page-info {
    font-size: 14px;
    color: var(--gray-500);
}

.page-goto {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--gray-500);
}

.page-goto input { text-align: center; width: 60px; }

/* ---------- 多试卷选择 & 分发模式 ---------- */
.radio-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.radio-group .check-label { font-weight: normal; }

/* 分发模式卡片切换 */
.mode-cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
    margin-bottom: 16px;
}

.mode-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    padding: 18px 16px;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all var(--transition);
    background: #fff;
    text-align: center;
}

.mode-card:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-md);
}

.mode-card.active {
    border-color: var(--primary);
    background: var(--primary-bg);
    box-shadow: 0 0 0 3px rgba(79,70,229,.15);
}

.mode-card input[type="radio"] {
    display: none;
}

.mode-icon {
    font-size: 28px;
    line-height: 1;
}

.mode-title {
    font-size: 15px;
    font-weight: 700;
    color: var(--gray-800);
}

.mode-card.active .mode-title {
    color: var(--primary-dark);
}

.mode-desc {
    font-size: 12px;
    color: var(--gray-500);
}

/* 试卷选取区域 */
.paper-pick {
    padding: 14px 16px;
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-sm);
    margin-top: 4px;
}

.paper-pick-label {
    font-size: 13px;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 8px;
}

.paper-pick select {
    width: 100%;
}

.paper-pick .hint {
    margin-top: 6px;
}

.multi-paper-list {
    max-height: 260px;
    overflow-y: auto;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-sm);
    padding: 10px 14px;
    background: #fff;
}

/* ---------- 条件行 ---------- */
.cond-row {
    padding: 12px 14px;
    margin-bottom: 10px;
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-sm);
    transition: all var(--transition);
}

.cond-row:hover { border-color: var(--primary-light); }

.cond-row .form-group { margin-bottom: 0; }

/* ---------- 分数段分布 ---------- */
.dist-card {
    background: #fff;
    border-radius: var(--radius);
    padding: 22px;
    margin-bottom: 28px;
    box-shadow: var(--shadow);
}

.dist-row {
    display: flex;
    align-items: center;
    gap: 14px;
    margin: 10px 0;
}

.dist-label {
    width: 100px;
    font-size: 13px;
    color: var(--gray-600);
    text-align: right;
    font-weight: 600;
}

.dist-track {
    flex: 1;
    background: var(--gray-100);
    border-radius: 999px;
    height: 16px;
    overflow: hidden;
}

.dist-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--primary-light));
    border-radius: 999px;
    transition: width .5s ease;
}

.dist-count {
    width: 52px;
    font-size: 13px;
    color: var(--gray-500);
    font-weight: 600;
}

/* ---------- 组卷双栏布局 ---------- */
.compose-layout {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 18px;
    align-items: start;
}

.compose-left,
.compose-right {
    padding: 0;
}

.compose-left .card,
.compose-right .card {
    /* 内容已在 card 内 */;
}

.compose-left table td,
.compose-right table td {
    font-size: 13px;
    padding: 8px 10px;
}

.type-header-row {
    background: var(--primary-bg) !important;
}

.type-header-row:hover {
    background: var(--primary-bg) !important;
}

.type-header {
    padding: 7px 12px !important;
    border-bottom: 2px solid var(--primary-light) !important;
}

.type-label {
    font-weight: 700;
    font-size: 13px;
    color: var(--primary-dark);
    margin-right: 10px;
}

.type-meta {
    font-size: 12px;
    color: var(--gray-500);
    font-weight: 500;
}

.pos-cell {
    color: var(--gray-400);
    font-size: 12px;
    text-align: center;
    width: 36px;
}

.score-cell {
    white-space: nowrap;
}

.score-input {
    width: 68px;
    padding: 5px 8px;
    border: 1.5px solid var(--gray-200);
    border-radius: 4px;
    font-size: 13px;
    text-align: center;
    transition: all var(--transition);
}

.score-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(79,70,229,.1);
    outline: none;
}

/* ---------- 错题本 ---------- */
.wrong-answer {
    color: var(--danger);
    font-weight: 700;
}

.source-line {
    font-size: 12px;
    color: var(--gray-400);
    margin-top: 10px;
}

/* ---------- 答案解析 ---------- */
.analysis-box {
    margin-top: 12px;
    padding: 12px 16px;
    background: var(--gray-50);
    border-left: 4px solid var(--primary);
    border-radius: var(--radius-sm);
    font-size: 14px;
    color: var(--gray-600);
}

.analysis-label {
    display: inline-block;
    font-weight: 700;
    color: var(--primary);
    margin-right: 8px;
}

/* ---------- 随机组卷面板 ---------- */
.random-panel {
    margin-bottom: 20px;
}

.random-panel h3 {
    margin-top: 0;
    display: flex;
    align-items: center;
    gap: 10px;
}

.random-panel .badge {
    font-size: 11px;
    vertical-align: middle;
}

.random-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.random-top-row {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-end;
    gap: 18px;
}

.random-top-row .form-group { margin-bottom: 0; }

.random-actions {
    display: flex;
    gap: 12px;
    align-items: center;
}

.random-form label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    color: var(--gray-600);
    font-weight: 500;
}

.random-form .hint-inline {
    font-size: 12px;
    color: var(--gray-400);
}

/* ---------- 全选复选框 ---------- */
.select-all {
    width: 16px;
    height: 16px;
    cursor: pointer;
    accent-color: var(--primary);
}

/* ---------- 滚动条美化 ---------- */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--gray-300);
    border-radius: 999px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--gray-400);
}

/* ---------- 考试答题双栏布局 ---------- */
.exam-layout {
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: 22px;
    align-items: start;
}

.exam-main {
    min-width: 0;
}

.question-nav-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 14px;
    background: #fff;
    padding: 10px 16px;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-100);
}

.question-nav-bar .muted {
    font-weight: 600;
    font-size: 14px;
    color: var(--gray-600);
}

.q-num {
    display: inline-block;
    min-width: 28px;
    height: 28px;
    line-height: 28px;
    text-align: center;
    background: var(--primary-bg);
    color: var(--primary-dark);
    border-radius: 6px;
    font-weight: 700;
    font-size: 13px;
    margin-right: 6px;
}

.exam-sidebar {
    background: #fff;
    border-radius: var(--radius);
    padding: 18px 16px;
    box-shadow: var(--shadow);
    position: sticky;
    top: 76px;
}

.sidebar-title {
    font-size: 15px;
    font-weight: 700;
    color: var(--gray-800);
    margin-bottom: 12px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--gray-100);
}

.q-nav-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 6px;
    margin-bottom: 12px;
}

.q-nav-btn {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1.5px solid var(--gray-200);
    border-radius: var(--radius-sm);
    background: #fff;
    font-size: 13px;
    font-weight: 600;
    color: var(--gray-600);
    cursor: pointer;
    transition: all var(--transition);
    padding: 0;
    line-height: 1;
}

.q-nav-btn:hover {
    border-color: var(--primary-light);
    color: var(--primary);
    transform: translateY(-1px);
}

.q-nav-btn.answered {
    background: var(--success-bg);
    border-color: var(--success);
    color: #065f46;
}

.q-nav-btn.unanswered {
    background: var(--gray-50);
    border-color: var(--gray-200);
}

.q-nav-btn.current {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    border-color: var(--primary);
    color: #fff;
    box-shadow: 0 2px 8px rgba(79,70,229,.35);
    transform: scale(1.08);
}

.legend {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    font-size: 12px;
    color: var(--gray-500);
    margin-bottom: 12px;
    padding-top: 10px;
    border-top: 1px solid var(--gray-100);
}

.legend span {
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

.dot {
    display: inline-block;
    width: 10px;
    height: 10px;
    border-radius: 3px;
}

.dot-current { background: var(--primary); }
.dot-answered { background: var(--success); }
.dot-unanswered { background: var(--gray-300); }

.sidebar-summary {
    background: var(--gray-50);
    border-radius: var(--radius-sm);
    padding: 10px 12px;
    font-size: 13px;
    color: var(--gray-600);
    line-height: 1.9;
}

.sidebar-summary span {
    font-weight: 700;
    color: var(--primary-dark);
}

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
    .container { padding: 0 14px; margin: 16px auto; }
    .navbar { padding: 0 14px; }
    .compose-layout {
        grid-template-columns: 1fr;
    }
    .toolbar { flex-direction: column; align-items: flex-start; }
    .card-grid { grid-template-columns: 1fr; }
    .nav-links { gap: 0; overflow-x: auto; }
    .nav-links a { font-size: 13px; padding: 4px 8px; }
    .exam-layout {
        grid-template-columns: 1fr;
    }
    .exam-sidebar {
        position: static;
    }
}

@media (max-width: 600px) {
    .stat-grid { grid-template-columns: repeat(2, 1fr); }
    .auth-card { margin: 30px 10px; padding: 24px 20px; }
    .mode-cards { grid-template-columns: 1fr; }
}

/* ========== 密码修改提示 ========== */
.password-hint {
    background: linear-gradient(135deg, #eef2ff, #e0e7ff);
    border: 1px solid #c7d2fe;
    border-radius: var(--radius-sm);
    padding: 14px 18px;
    margin-bottom: 18px;
    font-size: 13px;
    color: var(--gray-700);
}

.password-hint strong {
    color: var(--primary-dark);
    display: block;
    margin-bottom: 6px;
    font-size: 14px;
}

.password-hint ul {
    margin: 0;
    padding-left: 20px;
}

.password-hint li {
    margin: 3px 0;
    line-height: 1.6;
}

.password-strength {
    font-size: 12px;
    margin-top: 4px;
    font-weight: 600;
    min-height: 18px;
}

.password-match {
    font-size: 12px;
    margin-top: 4px;
    font-weight: 600;
    min-height: 18px;
}

/* ========== 表格排序 ========== */
.sortable {
    cursor: pointer;
    user-select: none;
    position: relative;
    padding-right: 20px !important;
    transition: background var(--transition);
}

.sortable:hover {
    background: var(--primary-bg);
}

.sortable::after {
    content: '↕';
    position: absolute;
    right: 6px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 12px;
    color: var(--gray-400);
    transition: color var(--transition);
}

.sortable.sort-asc::after {
    content: '↑';
    color: var(--primary);
}

.sortable.sort-desc::after {
    content: '↓';
    color: var(--primary);
}

.sortable.active-sort {
    background: var(--primary-bg);
    color: var(--primary-dark);
    font-weight: 600;
}

/* ========== 表格筛选增强 ========== */
.filter-active {
    border-color: var(--primary) !important;
    box-shadow: 0 0 0 2px rgba(79,70,229,.12) !important;
}

.filter-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 10px;
    background: var(--primary-bg);
    color: var(--primary-dark);
    border-radius: 999px;
    font-size: 12px;
    font-weight: 600;
    margin: 2px 4px;
}

.filter-badge .remove-filter {
    cursor: pointer;
    font-size: 14px;
    line-height: 1;
    opacity: 0.7;
    transition: opacity var(--transition);
}

.filter-badge .remove-filter:hover {
    opacity: 1;
}

.filter-summary {
    padding: 8px 14px;
    background: #f8fafc;
    border-radius: var(--radius-sm);
    margin-bottom: 10px;
    font-size: 13px;
    color: var(--gray-600);
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 6px;
}

.filter-summary strong {
    color: var(--gray-800);
}

/* ========== 表格行高亮 ========== */
.table tbody tr:hover {
    background: #f8fafc;
}

/* ========== 表格状态标签增强 ========== */
.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 999px;
    font-size: 11px;
    font-weight: 600;
    line-height: 1.6;
}

.badge-success { background: var(--success-bg); color: #065f46; }
.badge-warning { background: var(--warning-bg); color: #92400e; }
.badge-danger { background: var(--danger-bg); color: #991b1b; }
.badge-info { background: var(--info-bg); color: #155e75; }