:root {
    --primary-color: #0ea5e9;
    --primary-dark: #0284c7;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --background: #ffffff;
    --background-soft: #f8fafc;
    --border-color: #e2e8f0;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--background-soft);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.hidden {
    display: none !important;
}

/* 页面头部 */
.header {
    background: var(--background);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 4rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 700;
    color: var(--text-primary);
}

.logo i {
    font-size: 1.5rem;
    color: var(--primary-color);
}

.logo h1 {
    font-size: 1.25rem;
}

/* 导航菜单 */
.nav {
    position: relative;
}

.nav-toggle {
    display: block;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-primary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--radius-sm);
    transition: background-color 0.2s ease;
}

.nav-toggle:hover {
    background-color: var(--background-soft);
}

.nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--background);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    flex-direction: column;
    gap: 0;
    min-width: 200px;
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-menu.active {
    display: flex;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.2s ease;
    cursor: pointer;
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
    background-color: var(--background-soft);
}

.nav-link:last-child {
    border-bottom: none;
}

/* 英雄区域 */
.hero {
    background: linear-gradient(135deg, var(--primary-color), var(--success-color));
    color: white;
    padding: 4rem 0;
    text-align: center;
}

.hero-content h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.hero-content p {
    font-size: 1.125rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin-top: 2rem;
}

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

.stat-item i {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    display: block;
}

.stat-number {
    font-size: 1.5rem;
    font-weight: 700;
    display: block;
}

.stat-label {
    font-size: 0.875rem;
    opacity: 0.8;
}

/* 功能区域 */
.features {
    padding: 4rem 0;
}

.section-title {
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 3rem;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--background);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 25px rgba(14, 165, 233, 0.15);
    border-color: var(--primary-color);
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--success-color));
}

.card-icon {
    width: 4rem;
    height: 4rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: white;
    font-size: 1.5rem;
}

/* 不同功能卡片的图标样式 */
.district-icon {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
}

.parallel-icon {
    background: linear-gradient(135deg, #06b6d4, #0891b2);
}

.details-icon {
    background: linear-gradient(135deg, var(--success-color), #059669);
}

.feature-card h4 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.feature-card p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.card-features {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.feature-tag {
    background: var(--background-soft);
    color: var(--text-secondary);
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 500;
}

.card-button {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    width: 100%;
}

.card-button:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.card-button.disabled {
    background: #9ca3af;
    cursor: not-allowed;
}

.card-button.disabled:hover {
    background: #9ca3af;
    transform: none;
}

/* 二级菜单样式 */
.sub-menu {
    margin-top: 1rem;
    border-top: 1px solid var(--border-color);
    padding-top: 1rem;
}

.sub-menu-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    margin: 0.25rem 0;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: left;
}

.sub-menu-item:hover {
    background: var(--background-soft);
    color: var(--primary-color);
}

.sub-menu-item i {
    color: var(--success-color);
    font-size: 1rem;
}

.sub-menu-item span {
    font-size: 0.9rem;
    font-weight: 500;
}

/* 查询表单区域 */
.query-section {
    padding: 3rem 0;
    background: var(--background);
}

.section-header {
    text-align: center;
    margin-bottom: 2rem;
}

.section-header h3 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.section-header p {
    color: var(--text-secondary);
    font-size: 1rem;
}

.query-form-container {
    max-width: 800px;
    margin: 0 auto;
    background: var(--background);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.query-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.form-group label i {
    color: var(--primary-color);
}

.form-group input,
.form-group select {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: all 0.2s ease;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.1);
}

.submit-button {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 1rem 2rem;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 1rem;
}

.submit-button:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.submit-button:disabled {
    background: #9ca3af;
    cursor: not-allowed;
    transform: none;
}

/* 查询结果区域 */
.results-container {
    padding: 2rem 0;
    max-width: 1200px;
    margin: 0 auto;
}

.results-header {
    text-align: center;
    margin-bottom: 2rem;
}

.results-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.results-section {
    margin-bottom: 3rem;
}

.results-section h4 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.results-section h4 i {
    color: var(--primary-color);
}

.results-container ul {
    list-style: none;
    padding: 0;
    display: grid;
    gap: 0.5rem;
}

.results-container li {
    border-left: 3px solid var(--primary-color);
    background: var(--background);
    padding: 1rem;
    border-radius: var(--radius-md);
    transition: all 0.2s ease;
}

.results-container li:hover {
    background: var(--background-soft);
    transform: translateX(2px);
}

.school-name {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.school-info {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.school-info i {
    color: var(--primary-color);
}

.score-diff {
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.score-diff.positive {
    color: var(--success-color);
}

.score-diff.negative {
    color: var(--error-color);
}

/* 加载状态 */
.loading {
    text-align: center;
    padding: 2rem;
    color: var(--text-secondary);
}

.loading i {
    font-size: 2rem;
    color: var(--primary-color);
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* 页面底部 */
.footer {
    background: var(--text-primary);
    color: white;
    padding: 3rem 0 1rem;
    margin-top: 4rem;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: white;
}

.footer-section p {
    color: #cbd5e1;
    line-height: 1.6;
    margin-bottom: 0.5rem;
}

.footer-section ul {
    list-style: none;
    padding: 0;
}

.footer-section li {
    color: #cbd5e1;
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

.contact-email {
    color: var(--primary-color) !important;
    font-weight: 500;
}

.footer-bottom {
    border-top: 1px solid #374151;
    padding-top: 1rem;
    text-align: center;
}

.footer-bottom p {
    color: #9ca3af;
    font-size: 0.875rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hero-content h2 {
        font-size: 2rem;
    }

    .hero-stats {
        flex-direction: column;
        gap: 1.5rem;
    }

    .feature-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .form-row {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .feature-card {
        padding: 1.5rem;
    }

    .query-form-container {
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 2rem 0;
    }

    .hero-content h2 {
        font-size: 1.75rem;
    }

    .features {
        padding: 2rem 0;
    }

    .feature-card {
        padding: 1.25rem;
    }

    .card-icon {
        width: 3rem;
        height: 3rem;
        font-size: 1.25rem;
    }
}

/* 反馈表单样式 */
.feedback-form {
    margin-top: 1.5rem;
    padding: 1.5rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.feedback-form .form-group {
    margin-bottom: 1rem;
}

.feedback-form input,
.feedback-form textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.1);
    color: white;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.feedback-form input::placeholder,
.feedback-form textarea::placeholder {
    color: rgba(255, 255, 255, 0.7);
}

.feedback-form input:focus,
.feedback-form textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    background: rgba(255, 255, 255, 0.15);
    box-shadow: 0 0 0 2px rgba(14, 165, 233, 0.2);
}

.feedback-submit {
    width: 100%;
    padding: 0.75rem 1.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: 0.9rem;
}

.feedback-submit:hover {
    background: linear-gradient(135deg, var(--primary-dark), #0369a1);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(14, 165, 233, 0.3);
}

.feedback-submit:active {
    transform: translateY(0);
}

/* 移动端反馈表单优化 */
@media (max-width: 768px) {
    .feedback-form {
        padding: 1rem;
        margin-top: 1rem;
    }
    
    .feedback-form input,
    .feedback-form textarea {
        padding: 0.625rem;
        font-size: 0.875rem;
    }
    
    .feedback-submit {
        padding: 0.625rem 1rem;
        font-size: 0.875rem;
    }
}
