/* 全局样式重置和变量定义 */
:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --info-color: #17a2b8;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-tech: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.15);
    --shadow-xl: 0 20px 40px rgba(0,0,0,0.2);
    --border-radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--dark-color);
    overflow-x: hidden;
    background-color: #ffffff;
}

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}

/* 导航栏样式 */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    z-index: 1030;
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-md);
}

.navbar-brand {
    background: var(--gradient-tech);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-size: 1.5rem;
    font-weight: bold;
}

.navbar-nav .nav-link {
    color: var(--dark-color) !important;
    font-weight: 500;
    margin: 0 0.5rem;
    position: relative;
    transition: var(--transition);
}

.navbar-nav .nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: var(--transition);
    transform: translateX(-50%);
}

.navbar-nav .nav-link:hover::after,
.navbar-nav .nav-link.active::after {
    width: 80%;
}

/* 主页横幅样式 */
.hero-section {
    background: var(--gradient-tech);
    position: relative;
    overflow: hidden;
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100%;
}

.floating-animation {
    animation: float 6s ease-in-out infinite;
    text-align: center;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) scale(1); }
    50% { transform: translateY(-30px) scale(1.05); }
}

.particles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(circle at 20% 80%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(255, 255, 255, 0.05) 0%, transparent 50%);
    animation: particles 20s linear infinite;
}

@keyframes particles {
    0% { transform: translate(0, 0); }
    100% { transform: translate(-50px, -50px); }
}

/* 按钮样式 */
.btn {
    border-radius: 50px;
    padding: 12px 30px;
    font-weight: 600;
    transition: var(--transition);
    text-decoration: none;
    display: inline-block;
    border: none;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: white;
}

.btn-outline-light {
    background: transparent;
    color: white;
    border: 2px solid white;
}

.btn-outline-light:hover {
    background: white;
    color: var(--primary-color);
    transform: translateY(-2px);
}

/* 技术优势卡片 */
.advantage-card {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid rgba(0,0,0,0.05);
    position: relative;
    overflow: hidden;
}

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

.advantage-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

.advantage-card:hover::before {
    left: 0;
}

.icon-box {
    width: 80px;
    height: 80px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0,123,255,0.1);
    border-radius: 50%;
    transition: var(--transition);
}

.advantage-card:hover .icon-box {
    background: var(--gradient-primary);
    color: white;
}

.advantage-card:hover .icon-box i {
    color: white !important;
}

/* 解决方案卡片 */
.solution-card {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border-left: 4px solid transparent;
    position: relative;
    overflow: hidden;
}

.solution-card:nth-child(odd) {
    border-left-color: var(--primary-color);
}

.solution-card:nth-child(even) {
    border-left-color: var(--success-color);
}

.solution-card:hover {
    transform: translateX(10px);
    box-shadow: var(--shadow-lg);
}

.icon-wrapper {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(0,123,255,0.1), rgba(0,123,255,0.05));
    border-radius: 12px;
    flex-shrink: 0;
}

.solution-card:hover .icon-wrapper {
    background: var(--gradient-primary);
}

.solution-card:hover .icon-wrapper i {
    color: white !important;
}

/* 案例卡片 */
.case-card {
    background: white;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    height: 100%;
    display: flex;
    flex-direction: column;
}

.case-card:hover {
    transform: translateY(-15px);
    box-shadow: var(--shadow-xl);
}

.case-image {
    overflow: hidden;
    height: 250px;
    position: relative;
}

.case-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.case-card:hover .case-image img {
    transform: scale(1.1);
}

.case-content {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.case-stats {
    margin-top: auto;
    padding-top: 1rem;
}

.badge {
    margin-right: 0.5rem;
    font-size: 0.75rem;
    padding: 0.5rem 0.75rem;
}

/* 联系区域 */
.contact-item {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    color: var(--dark-color);
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
    opacity: 0;
    visibility: hidden;
    z-index: 1000;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

/* 表单样式 */
.modal-content {
    border-radius: var(--border-radius);
    border: none;
    box-shadow: var(--shadow-xl);
}

.modal-header {
    background: var(--gradient-tech);
    color: white;
    border-radius: var(--border-radius) var(--border-radius) 0 0;
    border: none;
}

.modal-header .btn-close {
    filter: brightness(0) invert(1);
}

.form-control {
    border-radius: 8px;
    border: 1px solid #e0e0e0;
    padding: 12px 15px;
    transition: var(--transition);
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(0,123,255,0.1);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hero-section {
        padding: 80px 0;
        text-align: center;
    }
    
    .display-4 {
        font-size: 2.5rem;
    }
    
    .btn-lg {
        padding: 10px 20px;
        font-size: 1rem;
    }
    
    .advantage-card,
    .solution-card,
    .case-card {
        margin-bottom: 20px;
    }
    
    .navbar-brand {
        font-size: 1.2rem;
    }
    
    .hero-image {
        margin-top: 2rem;
    }
    
    .floating-animation {
        font-size: 3rem !important;
    }
}

@media (max-width: 576px) {
    .container {
        padding: 0 15px;
    }
    
    .display-5 {
        font-size: 2rem;
    }
    
    .display-4 {
        font-size: 2rem;
    }
    
    .lead {
        font-size: 1rem;
    }
    
    .case-card {
        margin-bottom: 15px;
    }
    
    .icon-box {
        width: 60px;
        height: 60px;
    }
    
    .icon-wrapper {
        width: 50px;
        height: 50px;
    }
    
    .back-to-top {
        width: 40px;
        height: 40px;
        bottom: 20px;
        right: 20px;
    }
}

/* 加载动画 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 自定义滚动条 */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: var(--gradient-primary);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-color);
}

/* 高对比度模式支持 */
@media (prefers-contrast: high) {
    .btn-primary {
        background: #0066cc;
        border: 2px solid #0066cc;
    }
    
    .advantage-card,
    .solution-card,
    .case-card {
        border: 2px solid #333;
    }
}

/* 减少动画模式 */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}