/* 轻量化独居老人大数据监护助手项目 - 项目特色页面样式文件 */
/* 作者：XXX团队 创建时间：2026年 */

/* 特色功能展示区域 */
.features-showcase {
    padding: 4rem 0;
    background: var(--bg-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.feature-item {
    background: var(--bg-card);
    border-radius: 20px;
    padding: 2.5rem 2rem;
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    cursor: pointer;
}

.feature-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(26, 115, 232, 0.1), transparent);
    transition: var(--transition-slow);
}

.feature-item:hover::before {
    left: 100%;
}

.feature-item:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-blue);
}

.feature-icon {
    width: 100px;
    height: 100px;
    background: var(--gradient-tech);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: white;
    font-size: 2.5rem;
    position: relative;
    transition: var(--transition-normal);
}

.feature-item:hover .feature-icon {
    transform: scale(1.1) rotate(5deg);
}

.icon-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 120px;
    height: 120px;
    background: radial-gradient(circle, rgba(26, 115, 232, 0.3) 0%, transparent 70%);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    opacity: 0;
    transition: var(--transition-normal);
}

.feature-item:hover .icon-glow {
    opacity: 1;
    animation: pulse-glow 2s infinite;
}

@keyframes pulse-glow {
    0%, 100% { transform: translate(-50%, -50%) scale(1); }
    50% { transform: translate(-50%, -50%) scale(1.1); }
}

.feature-item h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
    background: var(--gradient-tech);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.feature-item p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 2rem;
    font-size: 0.95rem;
}

.feature-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: var(--primary-blue);
    color: white;
    border: none;
    border-radius: 25px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.feature-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: var(--transition-slow);
}

.feature-btn:hover::before {
    left: 100%;
}

.feature-btn:hover {
    background: var(--primary-purple);
    transform: translateX(5px);
}

.feature-btn i {
    transition: transform 0.3s ease;
}

.feature-btn:hover i {
    transform: translateX(3px);
}

/* 技术优势区域 */
.tech-advantages {
    padding: 4rem 0;
    background: var(--bg-secondary);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.advantage-card {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.advantage-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--gradient-tech);
    transition: var(--transition-normal);
}

.advantage-card:hover::before {
    width: 8px;
}

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

.advantage-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-blue);
    opacity: 0.2;
    margin-bottom: 1rem;
    line-height: 1;
}

.advantage-card h4 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

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

.advantage-list {
    list-style: none;
    padding: 0;
}

.advantage-list li {
    padding: 0.5rem 0;
    color: var(--text-primary);
    position: relative;
    padding-left: 1.5rem;
}

.advantage-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-green);
    font-weight: 600;
}

/* 应用场景区域 */
.application-scenarios {
    padding: 4rem 0;
    background: var(--bg-primary);
}

.scenarios-tabs {
    max-width: 1000px;
    margin: 0 auto;
}

.tab-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 1rem 2rem;
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: none;
    border-radius: 8px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.tab-btn::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--primary-blue);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

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

.tab-btn.active::before {
    transform: scaleX(1);
}

.tab-btn:hover:not(.active) {
    background: var(--bg-tertiary);
    transform: translateY(-2px);
}

.tab-content {
    position: relative;
}

.tab-pane {
    display: none;
    animation: fadeIn 0.5s ease;
}

.tab-pane.active {
    display: block;
}

.scenario-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 3rem;
    align-items: center;
}

.scenario-image {
    text-align: center;
}

.scenario-image i {
    font-size: 6rem;
    color: var(--primary-blue);
    opacity: 0.8;
}

.scenario-text h3 {
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.scenario-text p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
}

.scenario-text ul {
    list-style: none;
    padding: 0;
}

.scenario-text li {
    padding: 0.75rem 0;
    color: var(--text-primary);
    position: relative;
    padding-left: 2rem;
    border-bottom: 1px solid var(--border-light);
}

.scenario-text li::before {
    content: '▶';
    position: absolute;
    left: 0;
    color: var(--primary-green);
    font-weight: 600;
}

.scenario-text li:last-child {
    border-bottom: none;
}

/* 特色详情弹窗 */
.feature-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    backdrop-filter: blur(10px);
}

.feature-modal.show {
    display: flex;
    animation: modalFadeIn 0.3s ease;
}

@keyframes modalFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background: var(--bg-card);
    border-radius: 20px;
    padding: 2rem;
    max-width: 600px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
    transform: scale(0.9);
    transition: transform 0.3s ease;
}

.feature-modal.show .modal-content {
    transform: scale(1);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-light);
}

.modal-header h3 {
    margin: 0;
    color: var(--text-primary);
    font-size: 1.5rem;
}

.modal-close {
    background: none;
    border: none;
    font-size: 2rem;
    cursor: pointer;
    color: var(--text-muted);
    transition: color 0.3s ease;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

.modal-close:hover {
    color: var(--primary-red);
    background: var(--bg-secondary);
}

.modal-body {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 1.5rem;
    }
    
    .advantages-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }
    
    .scenario-content {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }
    
    .scenario-image i {
        font-size: 4rem;
    }
}

@media (max-width: 768px) {
    .features-showcase,
    .tech-advantages,
    .application-scenarios {
        padding: 3rem 0;
    }
    
    .feature-item {
        padding: 2rem 1.5rem;
    }
    
    .feature-icon {
        width: 80px;
        height: 80px;
        font-size: 2rem;
    }
    
    .tab-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .tab-btn {
        width: 100%;
        max-width: 300px;
    }
    
    .modal-content {
        margin: 1rem;
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .advantages-grid {
        grid-template-columns: 1fr;
    }
    
    .feature-item {
        padding: 1.5rem 1rem;
    }
    
    .scenario-text h3 {
        font-size: 1.5rem;
    }
    
    .scenario-text li {
        padding-left: 1.5rem;
        font-size: 0.9rem;
    }
}

/* 特殊动画效果 */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.feature-item,
.advantage-card,
.tab-pane {
    animation: fadeIn 0.6s ease forwards;
}

/* 延迟加载动画 */
.feature-item:nth-child(1) { animation-delay: 0.1s; }
.feature-item:nth-child(2) { animation-delay: 0.2s; }
.feature-item:nth-child(3) { animation-delay: 0.3s; }
.feature-item:nth-child(4) { animation-delay: 0.4s; }

.advantage-card:nth-child(1) { animation-delay: 0.1s; }
.advantage-card:nth-child(2) { animation-delay: 0.2s; }
.advantage-card:nth-child(3) { animation-delay: 0.3s; }
.advantage-card:nth-child(4) { animation-delay: 0.4s; }

/* 滚动动画 */
.scroll-animate {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

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