/* ====================
   解决方案页面样式 - 昱环智慧科技官网
   ==================== */

/* 页面头部 */
.page-header {
    position: relative;
    padding: 120px 0 80px;
    background: var(--gradient-primary);
    color: var(--white);
    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"><circle cx="20" cy="20" r="2" fill="rgba(255,255,255,0.1)"/><circle cx="80" cy="40" r="1.5" fill="rgba(255,255,255,0.1)"/><circle cx="40" cy="70" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="70" cy="10" r="1.2" fill="rgba(255,255,255,0.1)"/></svg>');
    animation: float 20s ease-in-out infinite;
}

.header-content {
    text-align: center;
    position: relative;
    z-index: 2;
}

.header-content h1 {
    font-size: 3.5rem;
    margin-bottom: 16px;
    font-weight: 700;
}

.header-subtitle {
    font-size: 1.2rem;
    margin-bottom: 24px;
    opacity: 0.9;
}

.breadcrumb {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 0.9rem;
    opacity: 0.8;
}

.breadcrumb a {
    color: var(--white);
    text-decoration: none;
    transition: var(--transition-fast);
}

.breadcrumb a:hover {
    opacity: 0.7;
}

/* 解决方案导航 */
.solutions-nav {
    background: var(--white);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 70px;
    z-index: 100;
}

.nav-tabs {
    display: flex;
    justify-content: center;
    gap: 0;
    padding: 20px 0;
}

.tab-btn {
    padding: 12px 32px;
    background: transparent;
    border: none;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-fast);
    position: relative;
    border-bottom: 3px solid transparent;
}

.tab-btn:hover {
    color: var(--primary-blue);
    background: var(--gradient-light);
}

.tab-btn.active {
    color: var(--primary-blue);
    border-bottom-color: var(--primary-blue);
}

/* 解决方案面板 */
.solution-panel {
    display: none;
    padding: 80px 0;
    background: var(--background-light);
}

.solution-panel.active {
    display: block;
}

.solution-overview {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    margin-bottom: 80px;
}

.overview-content h2 {
    font-size: 2.5rem;
    margin-bottom: 24px;
    color: var(--text-primary);
}

.overview-content p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 40px;
}

/* 功能特性网格 */
.features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

/* 图标占左侧（跨 2 行垂直居中），标题与描述自动堆叠在右侧 */
.feature-item {
    display: grid;
    grid-template-columns: auto 1fr;
    column-gap: 16px;
    row-gap: 4px;
    padding: 18px 20px;
    background: var(--white);
    border-radius: 12px;
    box-shadow: var(--shadow-light);
    border: 1px solid var(--border-color);
    transition: var(--transition-normal);
}

.feature-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
    border-color: transparent;
}

.feature-icon {
    grid-row: 1 / span 2;
    align-self: center;
    width: 48px;
    height: 48px;
    background: var(--gradient-light);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: var(--transition-normal);
}

.feature-icon svg {
    width: 24px;
    height: 24px;
    stroke: var(--primary-blue);
    stroke-width: 2;
    transition: var(--transition-normal);
}

.feature-item:hover .feature-icon {
    background: var(--gradient-primary);
}

.feature-item:hover .feature-icon svg {
    stroke: var(--white);
}

.feature-item h3 {
    margin: 0;
    align-self: end;
    font-family: 'Noto Serif SC', serif;
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.3;
    letter-spacing: 0.5px;
}

.feature-item p {
    margin: 0;
    align-self: start;
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.55;
}

/* 演示面板 */
.overview-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.demo-dashboard {
    background: var(--white);
    border-radius: 16px;
    padding: 24px;
    box-shadow: var(--shadow-medium);
    border: 1px solid var(--border-color);
    min-width: 400px;
}

.demo-dashboard h4 {
    text-align: center;
    margin-bottom: 24px;
    color: var(--text-primary);
    font-size: 1.2rem;
}

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin-bottom: 24px;
}

.metric-card {
    background: var(--background-light);
    padding: 16px;
    border-radius: 8px;
    text-align: center;
    border: 1px solid var(--border-color);
}

.metric-label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.metric-value {
    display: inline-block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-blue);
    font-family: 'Noto Serif SC', serif;
}

.metric-unit {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-left: 4px;
}

/* 图表容器 */
.chart-container {
    background: var(--background-light);
    border-radius: 8px;
    padding: 16px;
    border: 1px solid var(--border-color);
}

/* 流程指示器 */
.process-flow {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px;
    background: var(--background-light);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.flow-step {
    padding: 8px 16px;
    background: var(--white);
    border-radius: 20px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    border: 2px solid var(--border-color);
    transition: var(--transition-fast);
}

.flow-step.active {
    background: var(--primary-blue);
    color: var(--white);
    border-color: var(--primary-blue);
}

.flow-arrow {
    width: 20px;
    height: 2px;
    background: var(--border-color);
    position: relative;
}

.flow-arrow::after {
    content: '';
    position: absolute;
    right: -4px;
    top: -2px;
    width: 0;
    height: 0;
    border-left: 6px solid var(--border-color);
    border-top: 3px solid transparent;
    border-bottom: 3px solid transparent;
}

/* 碳管理时间线 */
.carbon-timeline {
    display: flex;
    justify-content: space-between;
    padding: 20px;
    background: var(--background-light);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    position: relative;
}

.carbon-timeline::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 10%;
    right: 10%;
    height: 2px;
    background: var(--border-color);
    z-index: 1;
}

.timeline-item {
    text-align: center;
    position: relative;
    z-index: 2;
}

.timeline-item .year {
    display: block;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.timeline-item .milestone {
    font-size: 0.8rem;
    color: var(--text-secondary);
    background: var(--white);
    padding: 4px 8px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.timeline-item.completed .milestone {
    background: var(--success);
    color: var(--white);
    border-color: var(--success);
}

.timeline-item.current .milestone {
    background: var(--primary-blue);
    color: var(--white);
    border-color: var(--primary-blue);
    animation: pulse 2s infinite;
}

/* 案例数据墙 */
.data-wall {
    margin-top: 60px;
}

.data-wall h3 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 40px;
    color: var(--text-primary);
}

.case-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 32px;
}

.case-card {
    background: var(--white);
    border-radius: 16px;
    padding: 32px;
    box-shadow: var(--shadow-light);
    border: 1px solid var(--border-color);
    transition: var(--transition-normal);
}

.case-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-medium);
}

.case-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
}

.case-header h4 {
    font-size: 1.3rem;
    color: var(--text-primary);
    margin: 0;
}

.case-status {
    padding: 4px 12px;
    background: var(--success);
    color: var(--white);
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 500;
}

.case-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-bottom: 24px;
}

.stat {
    text-align: center;
    padding: 16px;
    background: var(--background-light);
    border-radius: 8px;
}

.stat-number {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-blue);
    font-family: 'Noto Serif SC', serif;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

.case-results {
    background: var(--gradient-light);
    padding: 20px;
    border-radius: 8px;
}

.case-results p {
    margin-bottom: 12px;
    font-weight: 500;
    color: var(--text-primary);
}

.case-results ul {
    list-style: none;
    padding: 0;
}

.case-results li {
    padding: 4px 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
    position: relative;
    padding-left: 20px;
}

.case-results li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success);
    font-weight: bold;
}

/* 实时DEMO体验区 */
.demo-section {
    padding: 80px 0;
    background: var(--white);
}

.section-subtitle {
    text-align: center;
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
}

.demo-controls {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 40px;
}

.demo-btn {
    padding: 12px 24px;
    border: 2px solid var(--border-color);
    background: var(--white);
    color: var(--text-secondary);
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition-fast);
    font-weight: 500;
}

.demo-btn:hover {
    border-color: var(--primary-blue);
    color: var(--primary-blue);
}

.demo-btn.active {
    background: var(--primary-blue);
    border-color: var(--primary-blue);
    color: var(--white);
}

.demo-container {
    background: var(--background-light);
    border-radius: 16px;
    padding: 32px;
    box-shadow: var(--shadow-light);
    border: 1px solid var(--border-color);
}

.demo-panel {
    display: none;
}

.demo-panel.active {
    display: block;
}

.demo-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
}

.demo-header h3 {
    margin: 0;
    color: var(--text-primary);
}

.demo-controls-mini {
    display: flex;
    gap: 12px;
}

.demo-content {
    display: grid;
    grid-template-columns: 250px 1fr;
    gap: 24px;
    min-height: 400px;
}

.demo-sidebar {
    background: var(--white);
    border-radius: 8px;
    padding: 20px;
    border: 1px solid var(--border-color);
}

.demo-sidebar h4 {
    margin-bottom: 16px;
    color: var(--text-primary);
    font-size: 1rem;
}

.monitor-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.monitor-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px;
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition-fast);
    border: 1px solid transparent;
}

.monitor-item:hover {
    background: var(--background-light);
}

.monitor-item.active {
    background: var(--gradient-light);
    border-color: var(--primary-blue);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
}

.status-dot.normal {
    background: var(--success);
    box-shadow: 0 0 6px rgba(40, 167, 69, 0.6);
}

.status-dot.warning {
    background: var(--warning);
    box-shadow: 0 0 6px rgba(255, 193, 7, 0.6);
    animation: pulse 1.5s infinite;
}

.monitor-item .name {
    flex: 1;
    font-size: 0.9rem;
    color: var(--text-primary);
}

.monitor-item .value {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.demo-main {
    background: var(--white);
    border-radius: 8px;
    padding: 24px;
    border: 1px solid var(--border-color);
}

.chart-area {
    background: var(--background-light);
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
    text-align: center;
}

.data-panels {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}

.data-panel {
    background: var(--background-light);
    border-radius: 8px;
    padding: 20px;
    border: 1px solid var(--border-color);
}

.data-panel h5 {
    margin-bottom: 16px;
    color: var(--text-primary);
    font-size: 1rem;
}

.data-items {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.data-item {
    text-align: center;
    padding: 12px;
    background: var(--white);
    border-radius: 6px;
    border: 1px solid var(--border-color);
}

.data-item .label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.data-item .value {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--primary-blue);
    font-family: 'Noto Serif SC', serif;
}

.data-item .unit {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-left: 4px;
}

/* 动画定义 */
@keyframes pulse {
    0% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.1);
        opacity: 0.7;
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-10px);
    }
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .solution-overview {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .demo-content {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .demo-sidebar {
        order: 2;
    }
    
    .monitor-list {
        flex-direction: row;
        overflow-x: auto;
        gap: 12px;
    }
    
    .monitor-item {
        min-width: 150px;
        flex-shrink: 0;
    }
}

@media (max-width: 768px) {
    .page-header {
        padding: 100px 0 60px;
    }
    
    .header-content h1 {
        font-size: 2.5rem;
    }
    
    .nav-tabs {
        flex-direction: column;
        gap: 8px;
        padding: 16px;
    }
    
    .tab-btn {
        padding: 16px;
        border-radius: 8px;
        border-bottom: none;
        border-left: 3px solid transparent;
    }
    
    .tab-btn.active {
        border-bottom: none;
        border-left-color: var(--primary-blue);
        background: var(--gradient-light);
    }
    
    .solution-panel {
        padding: 60px 0;
    }
    
    .overview-content h2 {
        font-size: 2rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .case-cards {
        grid-template-columns: 1fr;
    }
    
    .case-stats {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    
    .demo-controls {
        flex-direction: column;
        align-items: center;
        gap: 12px;
    }
    
    .demo-btn {
        width: 100%;
        max-width: 250px;
    }
    
    .demo-container {
        padding: 20px;
    }
    
    .demo-header {
        flex-direction: column;
        gap: 16px;
        align-items: flex-start;
    }
    
    .demo-controls-mini {
        width: 100%;
        justify-content: center;
    }
    
    .dashboard-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    
    .data-items {
        grid-template-columns: 1fr;
    }
    
    .carbon-timeline {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
    
    .carbon-timeline::before {
        display: none;
    }
}

@media (max-width: 480px) {
    .demo-dashboard {
        min-width: auto;
        padding: 16px;
    }
    
    .case-card {
        padding: 20px;
    }
    
    .metric-value {
        font-size: 1.2rem;
    }

    /* 小屏 feature 卡片紧凑化，保证图标 + 标题 + 描述布局清晰 */
    .features-grid {
        gap: 12px;
    }

    .feature-item {
        padding: 14px 16px;
        column-gap: 12px;
    }

    .feature-icon {
        width: 40px;
        height: 40px;
        border-radius: 10px;
    }

    .feature-icon svg {
        width: 20px;
        height: 20px;
    }

    .feature-item h3 {
        font-size: 1rem;
        letter-spacing: 0;
    }

    .feature-item p {
        font-size: 0.8rem;
        line-height: 1.5;
    }
}