/* Global Styles */
:root {
    --primary-color: #2c5282;    /* 深蓝色 - 专业稳重 */
    --secondary-color: #4a5568;  /* 深灰色 - 沉稳大气 */
    --accent-color: #ed8936;    /* 橙色 - 活力点缀 */
    --text-color: #1a202c;     /* 近黑色 - 清晰易读 */
    --light-bg: #f7fafc;      /* 浅灰白 - 清爽背景 */
    --dark-bg: #2d3748;      /* 深蓝灰 - 沉稳背景 */
    
    /* 扩展配色 */
    --primary-light: #4299e1;   /* 主色浅色版 */
    --primary-dark: #2b6cb0;    /* 主色深色版 */
    --accent-light: #f6ad55;    /* 强调色浅色版 */
    --accent-dark: #dd6b20;     /* 强调色深色版 */
    --success-color: #48bb78;   /* 成功提示色 */
    --error-color: #e53e3e;     /* 错误提示色 */
    --warning-color: #ecc94b;   /* 警告提示色 */
    --info-color: #4299e1;      /* 信息提示色 */
}

body {
    font-family: 'Arial', sans-serif;
    color: var(--text-color);
    line-height: 1.6;
    padding-top: 76px; /* Account for fixed navbar */
}

/* Navigation */
.navbar {
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    transition: background-color 0.3s ease;
}

.navbar-scrolled {
    background-color: rgba(255, 255, 255, 0.95) !important;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.navbar-brand {
    font-weight: bold;
    color: var(--primary-color) !important;
}

.nav-link {
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: var(--primary-color) !important;
}

/* Hero Section */
.hero {
    background: linear-gradient(rgba(0,0,0,0.6), rgba(0,0,0,0.6)), url('../images/hero-bg.png');
    background-size: cover;
    background-position: center;
    height: 80vh;
    color: white;
    position: relative;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: bold;
    margin-bottom: 1rem;
}

.hero .lead {
    font-size: 1.5rem;
    margin-bottom: 2rem;
}

/* Buttons */
.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    padding: 0.75rem 2rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    border-color: var(--primary-dark);
    transform: translateY(-2px);
}

.btn-outline-primary {
    color: var(--primary-color);
    border-color: var(--primary-color);
    transition: all 0.3s ease;
}

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

/* Services Preview */
.services-preview {
    background-color: white;
}

.card {
    border: none;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
    background-color: white;
}

.card:hover {
    transform: translateY(-5px);
}

.card-img-top {
    height: 200px;
    object-fit: cover;
}

.card-title {
    color: var(--primary-color);
    font-weight: bold;
}

/* About Preview */
.about-preview {
    background-color: var(--light-bg);
}

.about-preview h2 {
    color: var(--secondary-color);
    font-weight: bold;
    margin-bottom: 1.5rem;
}

.about-preview img {
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

/* Footer */
.footer {
    background-color: var(--dark-bg);
}

.footer h5 {
    color: var(--accent-color);
    margin-bottom: 1.5rem;
}

/* Page Header */
.page-header {
    background-color: var(--light-bg);
    padding: 4rem 0;
}

.page-header h1 {
    color: var(--primary-color);
    font-weight: bold;
}

/* About Page */
.company-overview img {
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

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

.team-member img {
    height: 250px;
    object-fit: cover;
}

/* Services Page */
.service-item {
    margin-bottom: 5rem;
}

.service-features {
    list-style: none;
    padding-left: 0;
}

.service-features li {
    margin-bottom: 1rem;
}

.service-features i {
    margin-right: 1rem;
}

/* Portfolio Page */
.portfolio-filter {
    margin-bottom: 2rem;
}

.filter-buttons .btn {
    margin: 0.25rem;
}

.portfolio-item {
    transition: all 0.3s ease;
}

.portfolio-item:hover {
    transform: translateY(-5px);
}

.badge {
    margin-right: 0.5rem;
}

/* Contact Page */
.contact-info .card {
    height: 100%;
    transition: transform 0.3s ease;
}

.contact-info .card:hover {
    transform: translateY(-5px);
}

.contact-form .card {
    border: none;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.map-container {
    height: 400px;
    overflow: hidden;
}

.map-container img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero .lead {
        font-size: 1.2rem;
    }
    
    .about-preview img {
        margin-bottom: 2rem;
    }

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

    .service-item img {
        margin-bottom: 2rem;
    }

    .portfolio-filter .btn-group {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
    }

    .contact-info .card {
        margin-bottom: 1rem;
    }
}

/* Animations */
.fade-in {
    animation: fadeIn 1s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Hover Effects */
.hover-shadow {
    transition: box-shadow 0.3s ease;
}

.hover-shadow:hover {
    box-shadow: 0 8px 16px rgba(0,0,0,0.2);
}

.hover-scale {
    transition: transform 0.3s ease;
}

.hover-scale:hover {
    transform: scale(1.05);
}

/* Form Styles */
.form-control {
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 0.75rem;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(44, 82, 130, 0.25);
}

/* Call to Action */
.cta {
    background-color: var(--primary-color);
    color: white;
}

.cta .btn-light:hover {
    color: var(--primary-color);
}

/* 更新图标颜色 */
.text-primary {
    color: var(--primary-color) !important;
}

/* 更新徽章样式 */
.badge-primary {
    background-color: var(--primary-color);
}

.badge-secondary {
    background-color: var(--secondary-color);
}