/* 功能页面专用样式 */

/* 页面头部 */
.page-header {
    padding: 8rem 0 4rem;
    background: linear-gradient(135deg, var(--primary-50) 0%, var(--secondary-50) 100%);
    position: relative;
    overflow: hidden;
}

.page-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="%23e5e7eb" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

.header-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.page-title {
    font-size: 3rem;
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: 1rem;
}

.page-subtitle {
    font-size: 1.25rem;
    color: var(--gray-600);
    margin-bottom: 2rem;
    line-height: 1.7;
}

.header-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* 导航链接激活状态 */
.nav-links a.active {
    color: var(--primary-600);
}

.nav-links a.active::after {
    width: 100%;
}

/* 功能概览 */
.features-overview {
    padding: 6rem 0;
    background: white;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-2xl);
    padding: 2rem;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    cursor: pointer;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-500), var(--primary-600));
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

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

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-200);
}

.feature-icon {
    width: 3rem;
    height: 3rem;
    background: linear-gradient(135deg, var(--primary-100), var(--primary-200));
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    color: var(--primary-600);
    font-size: 1.25rem;
}

.feature-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 1rem;
}

.feature-desc {
    color: var(--gray-600);
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.feature-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag {
    background: var(--primary-100);
    color: var(--primary-700);
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    font-weight: 500;
}

/* 功能详细说明 */
.features-detail {
    padding: 6rem 0;
    background: var(--gray-50);
}

.feature-section {
    margin-bottom: 6rem;
}

.feature-section:last-child {
    margin-bottom: 0;
}

.feature-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.feature-content.reverse {
    grid-template-columns: 1fr 1fr;
}

.feature-content.reverse .feature-text {
    order: 2;
}

.feature-content.reverse .feature-visual {
    order: 1;
}

.feature-heading {
    font-size: 2rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 1.5rem;
}

.feature-description {
    color: var(--gray-600);
    line-height: 1.7;
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

.feature-benefits {
    margin-bottom: 2rem;
}

.benefit-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
    color: var(--gray-700);
}

.benefit-item i {
    color: var(--primary-500);
    font-size: 1.125rem;
}

.feature-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

.stat-item {
    text-align: center;
    background: white;
    padding: 1rem;
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-200);
}

.stat-number {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary-600);
    line-height: 1;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--gray-500);
    margin-top: 0.25rem;
}

/* 功能可视化组件 */
.feature-visual {
    position: relative;
}

.demo-mockup {
    background: white;
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    border: 1px solid var(--gray-200);
}

.demo-header {
    background: linear-gradient(135deg, var(--primary-600), var(--primary-700));
    color: white;
    padding: 1rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.demo-dots {
    display: flex;
    gap: 0.5rem;
}

.dot {
    width: 0.75rem;
    height: 0.75rem;
    border-radius: 50%;
}

.dot.red { background: #ef4444; }
.dot.yellow { background: #f59e0b; }
.dot.green { background: #10b981; }

.demo-title {
    font-weight: 600;
    font-size: 0.875rem;
}

.demo-content-area {
    padding: 1.5rem;
}

/* AI优化图表 */
.optimization-chart {
    margin-bottom: 1.5rem;
}

.chart-title {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 1rem;
}

.chart-bars {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.bar-item {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.bar-label {
    font-size: 0.75rem;
    color: var(--gray-600);
    width: 3rem;
}

.bar {
    flex: 1;
    height: 0.5rem;
    background: var(--gray-200);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-400), var(--primary-500));
    transition: width 0.3s ease;
}

.bar-value {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--primary-600);
    width: 2rem;
    text-align: right;
}

.optimization-result {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    background: var(--gray-50);
    border-radius: var(--radius-lg);
}

.result-label {
    font-size: 0.875rem;
    color: var(--gray-600);
}

.result-value {
    font-weight: 700;
    font-size: 0.875rem;
}

.result-value.old {
    color: var(--gray-500);
    text-decoration: line-through;
}

.result-value.new {
    color: var(--primary-600);
}

.result-value.save {
    color: var(--success);
}

/* 数据库查询界面 */
.database-mockup {
    background: white;
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    border: 1px solid var(--gray-200);
}

.database-header {
    background: var(--gray-50);
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--gray-200);
}

.database-header h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 1rem;
}

.search-box {
    position: relative;
}

.search-box i {
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray-400);
    font-size: 0.875rem;
}

.search-box input {
    width: 100%;
    padding: 0.5rem 0.75rem 0.5rem 2rem;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    background: white;
}

.database-content {
    padding: 1.5rem;
}

.ingredient-item {
    background: var(--gray-50);
    border-radius: var(--radius-lg);
    padding: 1rem;
}

.ingredient-name {
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 1rem;
}

.nutrition-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
}

.nutrition-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem;
    background: white;
    border-radius: var(--radius-sm);
    border: 1px solid var(--gray-200);
}

.nutrient-name {
    font-size: 0.75rem;
    color: var(--gray-600);
}

.nutrient-value {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--primary-600);
}

/* 成本分析界面 */
.cost-analysis-mockup {
    background: white;
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    border: 1px solid var(--gray-200);
}

.analysis-header {
    background: var(--gray-50);
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.analysis-header h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray-900);
}

.time-filter select {
    padding: 0.5rem;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    background: white;
}

.analysis-content {
    padding: 1.5rem;
}

.price-trend {
    margin-bottom: 1.5rem;
}

.trend-title {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 1rem;
}

.trend-chart {
    height: 4rem;
    background: var(--gray-50);
    border-radius: var(--radius-lg);
    position: relative;
    overflow: hidden;
}

.trend-line {
    position: absolute;
    top: 50%;
    left: 10%;
    right: 10%;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-400), var(--primary-500));
    transform: translateY(-50%);
}

.trend-points {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
}

.trend-point {
    position: absolute;
    width: 0.5rem;
    height: 0.5rem;
    background: var(--primary-500);
    border-radius: 50%;
    transform: translate(-50%, 50%);
}

.cost-alerts {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.alert-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
}

.alert-item.warning {
    background: #fef3c7;
    color: #92400e;
    border: 1px solid #fbbf24;
}

.alert-item.info {
    background: #dbeafe;
    color: #1e40af;
    border: 1px solid #3b82f6;
}

/* 功能对比 */
.feature-comparison {
    padding: 6rem 0;
    background: white;
}

.comparison-table {
    max-width: 950px;
    margin: 0 auto;
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    border: 1px solid var(--gray-200);
}

.comparison-header {
    display: grid;
    grid-template-columns: 1.6fr 1.7fr 1.7fr;
    background: var(--primary-600);
    color: white;
    font-weight: 700;
    font-size: 1.1rem;
}

.comparison-row {
    display: grid;
    grid-template-columns: 1.6fr 1.7fr 1.7fr;
    border-top: 1px solid var(--gray-200);
    transition: all 0.3s ease;
}

.comparison-row:hover {
    background: var(--gray-25);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
}

.comparison-row:nth-child(even) {
    background: var(--gray-25);
}

.comparison-row:nth-child(even):hover {
    background: var(--gray-100);
}

.comparison-cell {
    padding: 1.5rem 1.75rem;
    display: flex;
    align-items: center;
    font-size: 1rem;
    line-height: 1.6;
}

.comparison-cell:first-child {
    font-weight: 600;
    color: var(--gray-800);
    background: var(--gray-50);
    border-right: 1px solid var(--gray-200);
}

.comparison-cell:nth-child(2) {
    color: var(--gray-700);
    border-right: 1px solid var(--gray-100);
}

.comparison-cell.highlight {
    background: var(--primary-50);
    color: var(--primary-700);
    font-weight: 600;
    position: relative;
}

.comparison-cell.highlight::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--primary-500);
}

.comparison-cell.highlight i {
    color: var(--success);
    margin-right: 0.75rem;
    font-size: 1.1rem;
    flex-shrink: 0;
}


/* 特殊样式优化 */
.comparison-row:last-child .comparison-cell {
    border-bottom: none;
}

.comparison-header .comparison-cell {
    border-right: 1px solid rgba(255, 255, 255, 0.2);
    text-align: center;
    font-size: 1.1rem;
    padding: 1.75rem 1.75rem;
}

.comparison-header .comparison-cell:last-child {
    border-right: none;
}

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

    .header-actions {
        flex-direction: column;
        align-items: center;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .feature-content,
    .feature-content.reverse {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .feature-content.reverse .feature-text,
    .feature-content.reverse .feature-visual {
        order: unset;
    }

    .feature-stats {
        grid-template-columns: 1fr;
    }

    .comparison-table {
        margin: 0 1rem;
    }

    .comparison-header {
        grid-template-columns: 1fr;
    }

    .comparison-row {
        grid-template-columns: 1fr;
        margin-bottom: 1rem;
        border-radius: var(--radius-lg);
        overflow: hidden;
        box-shadow: var(--shadow-sm);
        border: 1px solid var(--gray-200);
    }

    .comparison-cell {
        padding: 1.25rem;
        border: none;
        border-bottom: 1px solid var(--gray-100);
        font-size: 0.95rem;
    }

    .comparison-cell:first-child {
        font-weight: 700;
        background: var(--gray-100);
        color: var(--gray-900);
        border-bottom: 2px solid var(--primary-500);
        font-size: 1rem;
    }

    .comparison-cell:nth-child(2) {
        background: var(--gray-50);
        color: var(--gray-700);
    }

    .comparison-cell.highlight {
        background: var(--primary-50);
        color: var(--primary-700);
    }

    .comparison-cell.highlight i {
        margin-right: 0.5rem;
        font-size: 0.9rem;
    }


    .comparison-header .comparison-cell {
        padding: 1.5rem 1.25rem;
        font-size: 1rem;
        text-align: center;
        border-right: none;
    }
}

/* 动画效果 */
@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.feature-section {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.feature-section.animate {
    opacity: 1;
    transform: translateY(0);
}

/* 滚动触发动画 */
.feature-section:nth-child(even) {
    animation-delay: 0.2s;
}

.feature-section:nth-child(odd) {
    animation-delay: 0.4s;
}