/* ========================================
   全局样式 - shweiqiong.com 网站建设
   ======================================== */

:root {
    --primary-color: #1a56db;
    --primary-dark: #1e40af;
    --primary-light: #3b82f6;
    --secondary-color: #0f172a;
    --accent-color: #f59e0b;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-light: #94a3b8;
    --bg-white: #ffffff;
    --bg-light: #f8fafc;
    --bg-gray: #f1f5f9;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
    --border-radius-xl: 16px;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-white);
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition-fast);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

ul, ol {
    list-style: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.container-fluid {
    width: 100%;
    padding: 0 20px;
}

.section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 50px;
}

.section-title h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--secondary-color);
    margin-bottom: 15px;
    position: relative;
    display: inline-block;
}

.section-title h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    border-radius: 2px;
}

.section-title p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 20px auto 0;
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--border-radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    border: none;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-secondary:hover {
    background: var(--primary-color);
    color: white;
}

/* ========================================
   导航栏样式
   ======================================== */

.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: transparent;
    transition: all var(--transition-normal);
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-md);
    backdrop-filter: blur(10px);
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    transition: padding var(--transition-normal);
}

.header.scrolled .header-inner {
    padding: 15px 0;
}

.logo {
    font-size: 1.8rem;
    font-weight: 800;
    color: white;
    transition: color var(--transition-normal);
}

.header.scrolled .logo {
    color: var(--primary-color);
}

.logo span {
    color: var(--accent-color);
}

.nav-menu {
    display: flex;
    gap: 35px;
}

.nav-link {
    color: rgba(255, 255, 255, 0.9);
    font-weight: 500;
    font-size: 1rem;
    position: relative;
    padding: 5px 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-color);
    transition: width var(--transition-normal);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.header.scrolled .nav-link {
    color: var(--text-primary);
}

.nav-link:hover,
.nav-link.active {
    color: var(--accent-color);
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: white;
    border-radius: 2px;
    transition: all var(--transition-normal);
}

.header.scrolled .hamburger span {
    background: var(--text-primary);
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* ========================================
   Banner 样式
   ======================================== */

.banner {
    position: relative;
    height: 100vh;
    min-height: 600px;
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--primary-dark) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.banner::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="1" fill="rgba(255,255,255,0.1)"/></svg>');
    background-size: 50px 50px;
    animation: moveBackground 100s linear infinite;
}

@keyframes moveBackground {
    from { background-position: 0 0; }
    to { background-position: 100% 100%; }
}

.banner-content {
    position: relative;
    z-index: 1;
    text-align: center;
    color: white;
    max-width: 800px;
    padding: 0 20px;
}

.banner-title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 20px;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 1s ease forwards 0.5s;
}

.banner-subtitle {
    font-size: 1.5rem;
    font-weight: 300;
    margin-bottom: 40px;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 1s ease forwards 0.8s;
}

.banner-btns {
    display: flex;
    gap: 20px;
    justify-content: center;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 1s ease forwards 1.1s;
}

@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========================================
   卡片样式
   ======================================== */

.card {
    background: var(--bg-white);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
}

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

.card-image {
    width: 100%;
    height: 220px;
    object-fit: cover;
    transition: transform var(--transition-normal);
}

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

.card-content {
    padding: 25px;
}

.card-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.card-text {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 15px;
}

.card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: var(--text-light);
}

/* ========================================
   网格布局
   ======================================== */

.grid {
    display: grid;
    gap: 30px;
}

.grid-2 {
    grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

/* ========================================
   页脚样式
   ======================================== */

.footer {
    background: linear-gradient(135deg, var(--secondary-color) 0%, #1a1a2e 100%);
    color: rgba(255, 255, 255, 0.8);
    padding: 60px 0 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-logo {
    font-size: 1.8rem;
    font-weight: 800;
    color: white;
    margin-bottom: 20px;
}

.footer-logo span {
    color: var(--accent-color);
}

.footer-desc {
    line-height: 1.8;
    margin-bottom: 20px;
}

.footer-social {
    display: flex;
    gap: 15px;
}

.social-link {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
}

.social-link:hover {
    background: var(--primary-color);
    transform: translateY(-3px);
}

.footer-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: white;
    margin-bottom: 20px;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    transition: all var(--transition-fast);
}

.footer-links a:hover {
    color: var(--accent-color);
    padding-left: 5px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 15px;
}

.contact-icon {
    color: var(--accent-color);
    font-size: 1.2rem;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 30px;
    text-align: center;
    font-size: 0.9rem;
}

/* ========================================
   动画类
   ======================================== */

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

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ========================================
   响应式设计
   ======================================== */

@media (max-width: 1024px) {
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--bg-white);
        flex-direction: column;
        padding: 80px 30px;
        gap: 20px;
        box-shadow: var(--shadow-xl);
        transition: right var(--transition-normal);
    }
    
    .nav-menu.active {
        right: 0;
    }
    
    .nav-link {
        color: var(--text-primary);
        font-size: 1.1rem;
    }
    
    .banner-title {
        font-size: 2.5rem;
    }
    
    .banner-subtitle {
        font-size: 1.2rem;
    }
    
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
    
    .section-title h2 {
        font-size: 2rem;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .banner-title {
        font-size: 2rem;
    }
    
    .banner-btns {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
}