/* ========================================
   消防设施操作员实操模拟考试系统
   全局样式系统
   ======================================== */

/* ---------- CSS 变量 / 设计令牌 ---------- */
:root {
    /* 主色调 - 深蓝体系 */
    --color-primary: #0A2463;
    --color-primary-dark: #061539;
    --color-primary-light: #1e3a7a;
    --color-primary-accent: #3e92cc;
    
    /* 消防红 - 强调色 */
    --color-danger: #C41E3A;
    --color-danger-dark: #9B152D;
    --color-danger-light: #E63946;
    
    /* 成功色 */
    --color-success: #2E7D32;
    --color-success-light: #4CAF50;
    
    /* 警告色 */
    --color-warning: #F57C00;
    --color-warning-light: #FFB74D;
    
    /* 中性色 */
    --color-white: #ffffff;
    --color-gray-50: #f8fafc;
    --color-gray-100: #f1f5f9;
    --color-gray-200: #e2e8f0;
    --color-gray-300: #cbd5e1;
    --color-gray-400: #94a3b8;
    --color-gray-500: #64748b;
    --color-gray-600: #475569;
    --color-gray-700: #334155;
    --color-gray-800: #1e293b;
    --color-gray-900: #0f172a;
    
    /* 文字颜色 */
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-tertiary: #64748b;
    --text-inverse: #ffffff;
    
    /* 背景色 */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-dark: #0A2463;
    
    /* 边框 */
    --border-color: #e2e8f0;
    --border-radius-sm: 4px;
    --border-radius: 8px;
    --border-radius-lg: 12px;
    --border-radius-xl: 16px;
    
    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    /* 间距 */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;
    --space-10: 40px;
    --space-12: 48px;
    --space-16: 64px;
    
    /* 字体 */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
    
    /* 字体大小 */
    --text-xs: 12px;
    --text-sm: 14px;
    --text-base: 16px;
    --text-lg: 18px;
    --text-xl: 20px;
    --text-2xl: 24px;
    --text-3xl: 30px;
    --text-4xl: 36px;
    
    /* 过渡 */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
    
    /* 容器宽度 */
    --container-max: 1280px;
    
    /* 顶部导航高度 */
    --header-height: 72px;
}

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

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

body {
    font-family: var(--font-sans);
    font-size: var(--text-base);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    min-height: 100vh;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

ul, ol {
    list-style: none;
}

button {
    font-family: inherit;
    font-size: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

input, textarea, select {
    font-family: inherit;
    font-size: inherit;
}

/* ---------- 布局容器 ---------- */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-6);
}

/* ---------- 顶部导航 ---------- */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--color-white);
    border-bottom: 1px solid var(--border-color);
    height: var(--header-height);
    box-shadow: var(--shadow-sm);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.logo-icon {
    width: 44px;
    height: 44px;
    background: linear-gradient(135deg, var(--color-danger) 0%, var(--color-danger-dark) 100%);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: var(--text-lg);
    box-shadow: 0 2px 8px rgba(196, 30, 58, 0.3);
}

.logo-text {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

.logo-title {
    font-size: var(--text-lg);
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: -0.02em;
}

.logo-subtitle {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
    margin-top: 2px;
}

.nav {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.nav-link {
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: var(--border-radius);
    transition: all var(--transition-fast);
    position: relative;
}

.nav-link:hover {
    color: var(--color-primary);
    background: var(--color-gray-50);
}

.nav-link.active {
    color: var(--color-primary);
    background: rgba(10, 36, 99, 0.08);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 50%;
    transform: translateX(-50%);
    width: 24px;
    height: 3px;
    background: var(--color-danger);
    border-radius: 2px 2px 0 0;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    font-size: var(--text-sm);
    cursor: pointer;
    transition: transform var(--transition-fast);
}

.user-avatar:hover {
    transform: scale(1.05);
}

/* ---------- 按钮组件 ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: 10px 20px;
    font-size: var(--text-sm);
    font-weight: 600;
    border-radius: var(--border-radius);
    transition: all var(--transition-base);
    cursor: pointer;
    border: 1px solid transparent;
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    color: var(--text-inverse);
    box-shadow: 0 2px 8px rgba(10, 36, 99, 0.25);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(10, 36, 99, 0.35);
}

.btn-danger {
    background: linear-gradient(135deg, var(--color-danger) 0%, var(--color-danger-dark) 100%);
    color: var(--text-inverse);
    box-shadow: 0 2px 8px rgba(196, 30, 58, 0.3);
}

.btn-danger:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(196, 30, 58, 0.4);
}

.btn-outline {
    background: var(--color-white);
    color: var(--color-primary);
    border-color: var(--border-color);
}

.btn-outline:hover {
    border-color: var(--color-primary);
    background: rgba(10, 36, 99, 0.04);
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
}

.btn-ghost:hover {
    background: var(--color-gray-100);
    color: var(--text-primary);
}

.btn-lg {
    padding: 14px 28px;
    font-size: var(--text-base);
}

.btn-xl {
    padding: 18px 36px;
    font-size: var(--text-lg);
    border-radius: var(--border-radius-lg);
}

.btn-block {
    width: 100%;
}

/* ---------- 卡片组件 ---------- */
.card {
    background: var(--color-white);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

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

.card-header {
    padding: var(--space-5) var(--space-6);
    border-bottom: 1px solid var(--border-color);
}

.card-body {
    padding: var(--space-6);
}

.card-footer {
    padding: var(--space-4) var(--space-6);
    border-top: 1px solid var(--border-color);
    background: var(--color-gray-50);
    border-radius: 0 0 var(--border-radius-lg) var(--border-radius-lg);
}

/* ---------- 徽章/标签 ---------- */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 10px;
    font-size: var(--text-xs);
    font-weight: 600;
    border-radius: 9999px;
    line-height: 1.8;
}

.badge-primary {
    background: rgba(10, 36, 99, 0.1);
    color: var(--color-primary);
}

.badge-danger {
    background: rgba(196, 30, 58, 0.1);
    color: var(--color-danger);
}

.badge-success {
    background: rgba(46, 125, 50, 0.1);
    color: var(--color-success);
}

.badge-warning {
    background: rgba(245, 124, 0, 0.1);
    color: var(--color-warning);
}

.badge-gray {
    background: var(--color-gray-100);
    color: var(--text-secondary);
}

/* ---------- 进度条 ---------- */
.progress {
    width: 100%;
    height: 8px;
    background: var(--color-gray-100);
    border-radius: 9999px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-primary-accent) 100%);
    border-radius: 9999px;
    transition: width var(--transition-slow);
}

.progress-bar.danger {
    background: linear-gradient(90deg, var(--color-danger) 0%, var(--color-danger-light) 100%);
}

.progress-bar.success {
    background: linear-gradient(90deg, var(--color-success) 0%, var(--color-success-light) 100%);
}

/* ---------- Hero 区域（首页） ---------- */
.hero {
    position: relative;
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 50%, #1a3a7a 100%);
    color: var(--text-inverse);
    padding: var(--space-16) 0;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(62, 146, 204, 0.15) 0%, transparent 70%);
    border-radius: 50%;
    transform: translate(30%, -30%);
}

.hero::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(196, 30, 58, 0.1) 0%, transparent 70%);
    border-radius: 50%;
    transform: translate(-20%, 20%);
}

.hero-inner {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: var(--space-12);
    align-items: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: 6px 14px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 9999px;
    font-size: var(--text-sm);
    margin-bottom: var(--space-5);
    backdrop-filter: blur(10px);
}

.hero-badge-dot {
    width: 8px;
    height: 8px;
    background: var(--color-success-light);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--color-success-light);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.hero-title {
    font-size: var(--text-4xl);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: var(--space-4);
    letter-spacing: -0.02em;
}

.hero-title .accent {
    color: var(--color-danger-light);
}

.hero-subtitle {
    font-size: var(--text-lg);
    color: rgba(255, 255, 255, 0.75);
    margin-bottom: var(--space-8);
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    gap: var(--space-4);
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    gap: var(--space-8);
    margin-top: var(--space-10);
}

.hero-stat-item {
    text-align: left;
}

.hero-stat-number {
    font-size: var(--text-3xl);
    font-weight: 700;
    color: var(--color-white);
}

.hero-stat-label {
    font-size: var(--text-sm);
    color: rgba(255, 255, 255, 0.6);
    margin-top: 4px;
}

.hero-visual {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-visual-card {
    position: relative;
    width: 100%;
    max-width: 420px;
    aspect-ratio: 4/3;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius-xl);
    backdrop-filter: blur(20px);
    padding: var(--space-6);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.hero-visual-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--color-danger) 0%, var(--color-danger-dark) 100%);
    border-radius: var(--border-radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-4);
    box-shadow: 0 8px 24px rgba(196, 30, 58, 0.4);
}

.hero-visual-title {
    font-size: var(--text-xl);
    font-weight: 600;
    margin-bottom: var(--space-2);
}

.hero-visual-desc {
    font-size: var(--text-sm);
    color: rgba(255, 255, 255, 0.6);
    text-align: center;
}

/* ---------- Section 通用样式 ---------- */
.section {
    padding: var(--space-16) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-12);
}

.section-title {
    font-size: var(--text-3xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-3);
    letter-spacing: -0.02em;
}

.section-subtitle {
    font-size: var(--text-lg);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ---------- 等级卡片（首页） ---------- */
.level-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
}

.level-card {
    background: var(--color-white);
    border-radius: var(--border-radius-xl);
    border: 1px solid var(--border-color);
    padding: var(--space-8);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.level-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-primary-accent) 100%);
    transform: scaleX(0);
    transition: transform var(--transition-base);
    transform-origin: left;
}

.level-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--color-primary-light);
}

.level-card:hover::before {
    transform: scaleX(1);
}

.level-card.danger::before {
    background: linear-gradient(90deg, var(--color-danger) 0%, var(--color-danger-light) 100%);
}

.level-card.danger:hover {
    border-color: var(--color-danger);
}

.level-icon {
    width: 64px;
    height: 64px;
    border-radius: var(--border-radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-5);
    font-size: 28px;
}

.level-card .level-icon {
    background: rgba(10, 36, 99, 0.1);
    color: var(--color-primary);
}

.level-card.danger .level-icon {
    background: rgba(196, 30, 58, 0.1);
    color: var(--color-danger);
}

.level-title {
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-2);
}

.level-desc {
    font-size: var(--text-sm);
    color: var(--text-tertiary);
    margin-bottom: var(--space-6);
}

.level-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4);
    margin-bottom: var(--space-6);
    padding: var(--space-4);
    background: var(--color-gray-50);
    border-radius: var(--border-radius);
}

.level-stat {
    text-align: center;
}

.level-stat-number {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--text-primary);
}

.level-stat-label {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
    margin-top: 2px;
}

.level-progress {
    margin-bottom: var(--space-6);
}

.level-progress-label {
    display: flex;
    justify-content: space-between;
    font-size: var(--text-sm);
    margin-bottom: var(--space-2);
}

.level-progress-label span:first-child {
    color: var(--text-secondary);
}

.level-progress-label span:last-child {
    font-weight: 600;
    color: var(--color-primary);
}

/* ---------- 鉴定点卡片 ---------- */
.points-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-4);
}

.point-card {
    background: var(--color-white);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--space-5);
    display: flex;
    gap: var(--space-4);
    transition: all var(--transition-fast);
    cursor: pointer;
}

.point-card:hover {
    border-color: var(--color-primary-light);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.point-number {
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    color: white;
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: var(--text-sm);
}

.point-card.completed .point-number {
    background: linear-gradient(135deg, var(--color-success) 0%, var(--color-success-light) 100%);
}

.point-info {
    flex: 1;
    min-width: 0;
}

.point-title {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-1);
    line-height: 1.4;
}

.point-meta {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-size: var(--text-xs);
    color: var(--text-tertiary);
}

.point-star {
    color: #ffc107;
    font-size: 13px;
    margin-right: 2px;
}

/* ---------- 等级 Tab ---------- */
.level-tabs {
    display: flex;
    justify-content: center;
    gap: var(--space-2);
    margin-bottom: var(--space-8);
}

.level-tab {
    padding: 10px 24px;
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--text-secondary);
    background: var(--color-white);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.level-tab:hover {
    color: var(--color-primary);
    border-color: var(--color-primary-light);
}

.level-tab.active {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

/* ---------- 模拟考试页面 ---------- */
.exam-layout {
    display: grid;
    grid-template-columns: 1fr 360px;
    gap: var(--space-6);
    padding: var(--space-6) 0;
    min-height: calc(100vh - var(--header-height));
}

.exam-main {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

/* 模拟器区域 */
.simulator-area {
    flex: 1;
    background: var(--color-gray-800);
    border-radius: var(--border-radius-lg);
    position: relative;
    overflow: hidden;
    min-height: 500px;
    display: flex;
    flex-direction: column;
}

.simulator-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-3) var(--space-5);
    background: rgba(0, 0, 0, 0.3);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    color: white;
}

.simulator-title {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-size: var(--text-sm);
    font-weight: 500;
}

.simulator-title::before {
    content: '';
    width: 8px;
    height: 8px;
    background: var(--color-success-light);
    border-radius: 50%;
    box-shadow: 0 0 8px var(--color-success-light);
}

.simulator-actions {
    display: flex;
    gap: var(--space-2);
}

.simulator-btn {
    padding: 6px 12px;
    font-size: var(--text-xs);
    color: rgba(255, 255, 255, 0.7);
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
}

.simulator-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

.simulator-content {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #1a2744 0%, #0d1b2a 100%);
    position: relative;
}

.simulator-placeholder {
    text-align: center;
    color: rgba(255, 255, 255, 0.4);
    padding: var(--space-8);
}

.simulator-placeholder-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--space-4);
    border: 2px dashed rgba(255, 255, 255, 0.2);
    border-radius: var(--border-radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 36px;
}

.simulator-placeholder-text {
    font-size: var(--text-lg);
    margin-bottom: var(--space-2);
    color: rgba(255, 255, 255, 0.6);
}

.simulator-placeholder-desc {
    font-size: var(--text-sm);
    color: rgba(255, 255, 255, 0.35);
}

/* 模拟设备示意图 - 火灾报警控制器 */
.mock-controller {
    width: 85%;
    max-width: 600px;
    background: linear-gradient(145deg, #2a3a5a 0%, #1a2744 100%);
    border-radius: var(--border-radius-lg);
    padding: var(--space-6);
    box-shadow: 
        0 20px 60px rgba(0, 0, 0, 0.5),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.mock-controller-screen {
    background: #0a1628;
    border-radius: var(--border-radius);
    padding: var(--space-4);
    margin-bottom: var(--space-5);
    border: 2px solid #1e3a5f;
    min-height: 120px;
    position: relative;
}

.mock-screen-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-3);
    padding-bottom: var(--space-2);
    border-bottom: 1px solid rgba(62, 146, 204, 0.3);
}

.mock-screen-title {
    color: #5dade2;
    font-size: var(--text-sm);
    font-weight: 600;
}

.mock-screen-status {
    display: flex;
    gap: var(--space-2);
}

.mock-status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #4CAF50;
    box-shadow: 0 0 6px #4CAF50;
}

.mock-status-dot.warning {
    background: #FF9800;
    box-shadow: 0 0 6px #FF9800;
}

.mock-screen-content {
    color: #7eb8da;
    font-size: var(--text-xs);
    font-family: 'Courier New', monospace;
    line-height: 1.8;
}

.mock-controller-indicators {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-3);
    margin-bottom: var(--space-5);
}

.mock-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3);
    background: rgba(0, 0, 0, 0.2);
    border-radius: var(--border-radius);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.mock-indicator-light {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: #333;
    border: 2px solid #555;
}

.mock-indicator-light.active {
    background: #4CAF50;
    border-color: #66BB6A;
    box-shadow: 0 0 10px #4CAF50;
}

.mock-indicator-light.alarm {
    background: #f44336;
    border-color: #ef5350;
    box-shadow: 0 0 10px #f44336;
    animation: blink 1s infinite;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.mock-indicator-label {
    font-size: 10px;
    color: rgba(255, 255, 255, 0.6);
    text-align: center;
}

.mock-controller-keypad {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-2);
}

.mock-key {
    aspect-ratio: 1.5;
    background: linear-gradient(145deg, #3a4a6a 0%, #2a3a5a 100%);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius-sm);
    color: rgba(255, 255, 255, 0.7);
    font-size: var(--text-sm);
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.mock-key:hover {
    background: linear-gradient(145deg, #4a5a7a 0%, #3a4a6a 100%);
    color: white;
}

.mock-key:active {
    transform: scale(0.95);
}

.mock-key.function {
    background: linear-gradient(145deg, var(--color-primary-light) 0%, var(--color-primary) 100%);
    color: white;
}

.mock-key.alarm {
    background: linear-gradient(145deg, var(--color-danger) 0%, var(--color-danger-dark) 100%);
    color: white;
}

/* 考试侧边栏 */
.exam-sidebar {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.exam-info-card {
    background: var(--color-white);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.exam-info-header {
    padding: var(--space-4) var(--space-5);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    color: white;
}

.exam-info-title {
    font-size: var(--text-base);
    font-weight: 600;
    margin-bottom: 4px;
}

.exam-info-subtitle {
    font-size: var(--text-xs);
    opacity: 0.8;
}

.exam-timer {
    padding: var(--space-5);
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

.timer-label {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
    margin-bottom: var(--space-2);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.timer-display {
    font-size: var(--text-3xl);
    font-weight: 700;
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
    letter-spacing: -0.02em;
}

.timer-display.warning {
    color: var(--color-warning);
}

.timer-display.danger {
    color: var(--color-danger);
}

.exam-question-info {
    padding: var(--space-5);
    border-bottom: 1px solid var(--border-color);
}

.question-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-3);
}

.question-number {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-primary);
}

.question-points {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
}

.question-title {
    font-size: var(--text-base);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-3);
    line-height: 1.5;
}

.question-req {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    background: var(--color-gray-50);
    padding: var(--space-3);
    border-radius: var(--border-radius);
    border-left: 3px solid var(--color-primary);
}

.question-req-label {
    font-size: var(--text-xs);
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 4px;
}

.exam-operations {
    padding: var(--space-5);
    border-bottom: 1px solid var(--border-color);
    max-height: 200px;
    overflow-y: auto;
}

.operations-title {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-3);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.operations-count {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
    font-weight: 400;
}

.operation-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.operation-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2) var(--space-3);
    background: var(--color-gray-50);
    border-radius: var(--border-radius-sm);
    font-size: var(--text-xs);
}

.operation-step {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    background: var(--color-gray-200);
    color: var(--text-secondary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 10px;
    font-weight: 600;
}

.operation-item.done .operation-step {
    background: var(--color-success);
    color: white;
}

.operation-item.current .operation-step {
    background: var(--color-primary);
    color: white;
    animation: pulse 1.5s infinite;
}

.operation-text {
    flex: 1;
    color: var(--text-secondary);
}

.operation-item.done .operation-text {
    color: var(--text-tertiary);
    text-decoration: line-through;
}

.operation-item.current .operation-text {
    color: var(--text-primary);
    font-weight: 500;
}

.exam-actions {
    padding: var(--space-5);
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

/* 题目导航 */
.question-nav {
    background: var(--color-white);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    padding: var(--space-5);
}

.question-nav-title {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-4);
}

.question-nav-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--space-2);
}

.question-nav-item {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-xs);
    font-weight: 600;
    border-radius: var(--border-radius-sm);
    background: var(--color-gray-100);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 2px solid transparent;
}

.question-nav-item:hover {
    background: var(--color-gray-200);
}

.question-nav-item.current {
    background: var(--color-primary);
    color: white;
}

.question-nav-item.answered {
    background: rgba(46, 125, 50, 0.15);
    color: var(--color-success);
    border-color: var(--color-success);
}

.question-nav-item.current.answered {
    background: var(--color-success);
    color: white;
}

.question-nav-legend {
    display: flex;
    gap: var(--space-4);
    margin-top: var(--space-4);
    padding-top: var(--space-4);
    border-top: 1px solid var(--border-color);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-xs);
    color: var(--text-tertiary);
}

.legend-dot {
    width: 12px;
    height: 12px;
    border-radius: 3px;
}

.legend-dot.current {
    background: var(--color-primary);
}

.legend-dot.answered {
    background: var(--color-success);
}

.legend-dot.unanswered {
    background: var(--color-gray-200);
}

/* ---------- 考试结果页面 ---------- */
.result-container {
    max-width: 900px;
    margin: var(--space-12) auto;
}

.result-header {
    text-align: center;
    margin-bottom: var(--space-10);
}

.result-status {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-8) var(--space-12);
    border-radius: var(--border-radius-xl);
    background: var(--color-white);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
}

.result-status-icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 40px;
}

.result-status.pass .result-status-icon {
    background: rgba(46, 125, 50, 0.1);
    color: var(--color-success);
}

.result-status.fail .result-status-icon {
    background: rgba(196, 30, 58, 0.1);
    color: var(--color-danger);
}

.result-status-text {
    font-size: var(--text-3xl);
    font-weight: 700;
}

.result-status.pass .result-status-text {
    color: var(--color-success);
}

.result-status.fail .result-status-text {
    color: var(--color-danger);
}

.result-status-desc {
    font-size: var(--text-sm);
    color: var(--text-tertiary);
}

.result-score-section {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--space-6);
    margin-bottom: var(--space-8);
}

.score-display {
    background: var(--color-white);
    border-radius: var(--border-radius-xl);
    border: 1px solid var(--border-color);
    padding: var(--space-8);
    text-align: center;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.score-number {
    font-size: 72px;
    font-weight: 800;
    line-height: 1;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--space-2);
}

.score-label {
    font-size: var(--text-sm);
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.score-pass-line {
    margin-top: var(--space-4);
    font-size: var(--text-sm);
    color: var(--text-secondary);
}

.score-pass-line span {
    color: var(--color-success);
    font-weight: 600;
}

.result-stats {
    background: var(--color-white);
    border-radius: var(--border-radius-xl);
    border: 1px solid var(--border-color);
    padding: var(--space-6);
}

.result-stats-title {
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-5);
}

.result-stat-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-4);
}

.result-stat-item {
    text-align: center;
    padding: var(--space-4);
    background: var(--color-gray-50);
    border-radius: var(--border-radius);
}

.result-stat-number {
    font-size: var(--text-2xl);
    font-weight: 700;
    margin-bottom: 4px;
}

.result-stat-number.correct {
    color: var(--color-success);
}

.result-stat-number.wrong {
    color: var(--color-danger);
}

.result-stat-number.incomplete {
    color: var(--text-tertiary);
}

.result-stat-label {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
}

.result-time {
    margin-top: var(--space-5);
    padding-top: var(--space-5);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.result-time-label {
    font-size: var(--text-sm);
    color: var(--text-secondary);
}

.result-time-value {
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--text-primary);
}

/* 详细评分 */
.detail-score {
    background: var(--color-white);
    border-radius: var(--border-radius-xl);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.detail-score-header {
    padding: var(--space-5) var(--space-6);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.detail-score-title {
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--text-primary);
}

.detail-score-list {
    padding: 0;
}

.detail-score-item {
    display: flex;
    align-items: center;
    padding: var(--space-4) var(--space-6);
    border-bottom: 1px solid var(--border-color);
    gap: var(--space-4);
}

.detail-score-item:last-child {
    border-bottom: none;
}

.detail-item-number {
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    background: var(--color-gray-100);
    color: var(--text-secondary);
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-sm);
    font-weight: 600;
}

.detail-item-content {
    flex: 1;
    min-width: 0;
}

.detail-item-title {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.detail-item-category {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
}

.detail-item-score {
    flex-shrink: 0;
    text-align: right;
}

.detail-item-score-value {
    font-size: var(--text-lg);
    font-weight: 700;
}

.detail-item-score-value.full {
    color: var(--color-success);
}

.detail-item-score-value.partial {
    color: var(--color-warning);
}

.detail-item-score-value.zero {
    color: var(--color-danger);
}

.detail-item-score-total {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
}

.result-actions {
    display: flex;
    justify-content: center;
    gap: var(--space-4);
    margin-top: var(--space-8);
}

/* ---------- 用户中心 ---------- */
.user-center-layout {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: var(--space-6);
    padding: var(--space-8) 0;
}

.user-sidebar {
    background: var(--color-white);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    overflow: hidden;
    height: fit-content;
}

.user-profile-card {
    padding: var(--space-6);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    color: white;
    text-align: center;
}

.user-profile-avatar {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    margin: 0 auto var(--space-3);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-2xl);
    font-weight: 600;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.user-profile-name {
    font-size: var(--text-lg);
    font-weight: 600;
    margin-bottom: 4px;
}

.user-profile-level {
    font-size: var(--text-xs);
    opacity: 0.8;
}

.user-nav {
    padding: var(--space-3) 0;
}

.user-nav-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-5);
    font-size: var(--text-sm);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    border-left: 3px solid transparent;
}

.user-nav-item:hover {
    background: var(--color-gray-50);
    color: var(--text-primary);
}

.user-nav-item.active {
    background: rgba(10, 36, 99, 0.06);
    color: var(--color-primary);
    border-left-color: var(--color-primary);
    font-weight: 500;
}

.user-nav-icon {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.user-content {
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
}

.user-section-title {
    font-size: var(--text-xl);
    font-weight: 600;
    color: var(--text-primary);
}

/* 数据概览卡片 */
.stats-overview {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-4);
}

.stat-card {
    background: var(--color-white);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    padding: var(--space-5);
}

.stat-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--space-3);
}

.stat-card-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
}

.stat-card-icon.blue {
    background: rgba(10, 36, 99, 0.1);
    color: var(--color-primary);
}

.stat-card-icon.green {
    background: rgba(46, 125, 50, 0.1);
    color: var(--color-success);
}

.stat-card-icon.red {
    background: rgba(196, 30, 58, 0.1);
    color: var(--color-danger);
}

.stat-card-icon.orange {
    background: rgba(245, 124, 0, 0.1);
    color: var(--color-warning);
}

.stat-card-value {
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.stat-card-label {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
}

.stat-card-change {
    font-size: var(--text-xs);
    display: flex;
    align-items: center;
    gap: 2px;
}

.stat-card-change.up {
    color: var(--color-success);
}

.stat-card-change.down {
    color: var(--color-danger);
}

/* 学习进度 */
.progress-section {
    background: var(--color-white);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    padding: var(--space-6);
}

.progress-section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-6);
}

.progress-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-5);
}

.progress-item {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.progress-item-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.progress-item-title {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--text-primary);
}

.progress-item-percent {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-primary);
}

.progress-item-meta {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
}

/* 考试记录表格 */
.record-table-wrap {
    background: var(--color-white);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.record-table {
    width: 100%;
    border-collapse: collapse;
}

.record-table th {
    padding: var(--space-4) var(--space-5);
    text-align: left;
    font-size: var(--text-xs);
    font-weight: 600;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    background: var(--color-gray-50);
    border-bottom: 1px solid var(--border-color);
}

.record-table td {
    padding: var(--space-4) var(--space-5);
    font-size: var(--text-sm);
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-color);
}

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

.record-table tr:hover td {
    background: var(--color-gray-50);
}

.record-score {
    font-weight: 600;
    color: var(--text-primary);
}

.record-score.pass {
    color: var(--color-success);
}

.record-score.fail {
    color: var(--color-danger);
}

/* ---------- 登录页面 ---------- */
.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 50%, #1a3a7a 100%);
    position: relative;
    overflow: hidden;
    padding: var(--space-6);
}

.auth-page::before {
    content: '';
    position: absolute;
    top: -200px;
    right: -200px;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(62, 146, 204, 0.15) 0%, transparent 70%);
    border-radius: 50%;
}

.auth-page::after {
    content: '';
    position: absolute;
    bottom: -150px;
    left: -150px;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(196, 30, 58, 0.1) 0%, transparent 70%);
    border-radius: 50%;
}

.auth-container {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 460px;
}

.auth-logo {
    text-align: center;
    margin-bottom: var(--space-8);
}

.auth-logo-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--color-danger) 0%, var(--color-danger-dark) 100%);
    border-radius: var(--border-radius-lg);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: var(--text-2xl);
    margin-bottom: var(--space-4);
    box-shadow: 0 4px 16px rgba(196, 30, 58, 0.4);
}

.auth-logo-title {
    font-size: var(--text-2xl);
    font-weight: 700;
    color: white;
    margin-bottom: var(--space-2);
}

.auth-logo-subtitle {
    font-size: var(--text-sm);
    color: rgba(255, 255, 255, 0.6);
}

.auth-card {
    background: var(--color-white);
    border-radius: var(--border-radius-xl);
    padding: var(--space-8);
    box-shadow: var(--shadow-xl);
}

.auth-tabs {
    display: flex;
    margin-bottom: var(--space-6);
    border-bottom: 2px solid var(--border-color);
}

.auth-tab {
    flex: 1;
    padding: var(--space-3) 0;
    font-size: var(--text-base);
    font-weight: 600;
    color: var(--text-tertiary);
    text-align: center;
    cursor: pointer;
    position: relative;
    transition: color var(--transition-fast);
}

.auth-tab.active {
    color: var(--color-primary);
}

.auth-tab.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--color-primary);
    border-radius: 2px 2px 0 0;
}

.auth-form-group {
    margin-bottom: var(--space-5);
}

.auth-form-label {
    display: block;
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: var(--space-2);
}

.auth-form-input {
    width: 100%;
    padding: 12px 16px;
    font-size: var(--text-base);
    color: var(--text-primary);
    background: var(--color-gray-50);
    border: 1.5px solid var(--border-color);
    border-radius: var(--border-radius);
    transition: all var(--transition-fast);
    outline: none;
}

.auth-form-input:focus {
    border-color: var(--color-primary);
    background: var(--color-white);
    box-shadow: 0 0 0 3px rgba(10, 36, 99, 0.1);
}

.auth-form-input::placeholder {
    color: var(--text-tertiary);
}

.auth-input-icon {
    position: relative;
}

.auth-input-icon .auth-form-input {
    padding-left: 44px;
}

.auth-input-icon .input-icon {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-tertiary);
    font-size: 16px;
}

.captcha-row {
    display: flex;
    gap: var(--space-3);
}

.captcha-row .auth-form-input {
    flex: 1;
}

.captcha-img {
    width: 120px;
    height: 44px;
    background: var(--color-gray-100);
    border: 1.5px solid var(--border-color);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-lg);
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: 4px;
    font-family: 'Courier New', monospace;
    cursor: pointer;
    user-select: none;
    background-image: linear-gradient(45deg, transparent 48%, rgba(0,0,0,0.05) 50%, transparent 52%),
                      linear-gradient(-45deg, transparent 48%, rgba(0,0,0,0.05) 50%, transparent 52%);
    background-size: 10px 10px;
}

.auth-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-6);
}

.auth-remember {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-sm);
    color: var(--text-secondary);
    cursor: pointer;
}

.auth-remember input {
    width: 16px;
    height: 16px;
    accent-color: var(--color-primary);
}

.auth-forgot {
    font-size: var(--text-sm);
    color: var(--color-primary);
    font-weight: 500;
}

.auth-forgot:hover {
    text-decoration: underline;
}

.auth-submit {
    width: 100%;
    padding: 14px;
    font-size: var(--text-base);
    font-weight: 600;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: 0 4px 12px rgba(10, 36, 99, 0.25);
}

.auth-submit:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(10, 36, 99, 0.35);
}

.auth-footer {
    text-align: center;
    margin-top: var(--space-6);
    font-size: var(--text-sm);
    color: var(--text-secondary);
}

.auth-footer a {
    color: var(--color-primary);
    font-weight: 500;
}

.auth-footer a:hover {
    text-decoration: underline;
}

/* ---------- 页脚 ---------- */
.footer {
    background: var(--color-gray-800);
    color: rgba(255, 255, 255, 0.6);
    padding: var(--space-12) 0 var(--space-6);
    margin-top: var(--space-16);
}

.footer-inner {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--space-8);
    margin-bottom: var(--space-8);
}

.footer-brand {
    max-width: 300px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

.footer-logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--color-danger) 0%, var(--color-danger-dark) 100%);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
}

.footer-logo-text {
    font-size: var(--text-lg);
    font-weight: 700;
    color: white;
}

.footer-desc {
    font-size: var(--text-sm);
    line-height: 1.7;
}

.footer-col-title {
    font-size: var(--text-sm);
    font-weight: 600;
    color: white;
    margin-bottom: var(--space-4);
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.footer-link {
    font-size: var(--text-sm);
    color: rgba(255, 255, 255, 0.5);
    transition: color var(--transition-fast);
}

.footer-link:hover {
    color: white;
}

.footer-bottom {
    padding-top: var(--space-6);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: var(--text-xs);
}

/* ---------- 工具类 ---------- */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-primary { color: var(--color-primary); }
.text-danger { color: var(--color-danger); }
.text-success { color: var(--color-success); }
.text-secondary { color: var(--text-secondary); }
.text-tertiary { color: var(--text-tertiary); }

.font-bold { font-weight: 700; }
.font-medium { font-weight: 500; }

.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }

.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }

/* ---------- 模式控制 ---------- */
/* 练习模式与考试模式的显隐切换 */
.mode-exam .practice-only {
    display: none !important;
}
.mode-practice .exam-only {
    display: none !important;
}

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
    .hero-inner {
        grid-template-columns: 1fr;
    }
    
    .level-cards {
        grid-template-columns: 1fr;
    }
    
    .points-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .exam-layout {
        grid-template-columns: 1fr;
    }
    
    .user-center-layout {
        grid-template-columns: 1fr;
    }
    
    .stats-overview {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .result-score-section {
        grid-template-columns: 1fr;
    }
    
    .footer-inner {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 640px) {
    :root {
        --header-height: 60px;
    }
    
    .nav {
        display: none;
    }
    
    .points-grid {
        grid-template-columns: 1fr;
    }
    
    .hero-title {
        font-size: var(--text-2xl);
    }
    
    .section-title {
        font-size: var(--text-2xl);
    }
    
    .stats-overview {
        grid-template-columns: 1fr;
    }
    
    .footer-inner {
        grid-template-columns: 1fr;
    }
    
    .question-nav-grid {
        grid-template-columns: repeat(5, 1fr);
    }
    
    .result-stat-grid {
        grid-template-columns: 1fr;
    }
}