/* ========================================
   北京尧图网络科技有限公司 - 主样式文件
   深色科技风 + 霓虹蓝绿渐变 + 玻璃拟态
   ======================================== */

:root {
    --primary-dark: #0a0e17;
    --secondary-dark: #121826;
    --card-bg: rgba(18, 24, 38, 0.85);
    --neon-blue: #00f0ff;
    --neon-green: #00ff9d;
    --neon-purple: #b967ff;
    --gradient-main: linear-gradient(135deg, #00f0ff 0%, #00ff9d 100%);
    --gradient-secondary: linear-gradient(135deg, #b967ff 0%, #00f0ff 100%);
    --glass-border: rgba(255, 255, 255, 0.1);
    --text-primary: #ffffff;
    --text-secondary: #a0aec0;
    --text-muted: #718096;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
    background: var(--primary-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    background-image: 
        radial-gradient(circle at 20% 30%, rgba(0, 240, 255, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(0, 255, 157, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(185, 103, 255, 0.05) 0%, transparent 70%);
    background-attachment: fixed;
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--secondary-dark);
}

::-webkit-scrollbar-thumb {
    background: var(--gradient-main);
    border-radius: 4px;
}

/* 顶部导航 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 1rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.4s ease;
    backdrop-filter: blur(10px);
}

.navbar.scrolled {
    background: rgba(10, 14, 23, 0.95);
    box-shadow: 0 4px 30px rgba(0, 240, 255, 0.1);
    padding: 0.8rem 5%;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
}

.logo img {
    width: 45px;
    height: 45px;
    border-radius: 8px;
    box-shadow: 0 0 20px rgba(0, 240, 255, 0.3);
}

.logo-text {
    font-size: 1.4rem;
    font-weight: 700;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    position: relative;
    padding: 0.5rem 0;
    transition: color 0.3s ease;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-main);
    transition: width 0.3s ease;
}

.nav-links a:hover {
    color: var(--neon-blue);
}

.nav-links a:hover::after {
    width: 100%;
}

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

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--neon-blue);
    border-radius: 2px;
    transition: all 0.3s ease;
}

/* 通用容器 */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 5%;
}

/* 浮动卡片通用样式 */
.float-card {
    background: var(--card-bg);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 2rem;
    backdrop-filter: blur(20px);
    box-shadow: 
        0 8px 32px rgba(0, 0, 0, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    position: relative;
    overflow: hidden;
}

.float-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 240, 255, 0.1), transparent);
    transition: left 0.6s ease;
}

.float-card:hover::before {
    left: 100%;
}

.float-card:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: 
        0 20px 60px rgba(0, 240, 255, 0.15),
        inset 0 1px 0 rgba(255, 255, 255, 0.15);
    border-color: rgba(0, 240, 255, 0.3);
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--gradient-main);
    color: var(--primary-dark);
    box-shadow: 0 4px 20px rgba(0, 240, 255, 0.4);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(0, 240, 255, 0.6);
}

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

.btn-secondary:hover {
    background: var(--neon-blue);
    color: var(--primary-dark);
    transform: translateY(-3px);
}

/* 标题样式 */
.section-title {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title h2 {
    font-size: 2.8rem;
    margin-bottom: 1rem;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
}

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

/* 网格布局 */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

/* 页脚 */
.footer {
    background: var(--secondary-dark);
    padding: 4rem 5% 2rem;
    margin-top: 6rem;
    border-top: 1px solid var(--glass-border);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 1.5rem;
}

.footer-logo img {
    width: 50px;
    height: 50px;
    border-radius: 10px;
}

.footer-about {
    color: var(--text-secondary);
    line-height: 1.8;
}

.footer h4 {
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    font-size: 1.2rem;
    position: relative;
    padding-bottom: 0.5rem;
}

.footer h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background: var(--gradient-main);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.8rem;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: var(--neon-blue);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--glass-border);
    color: var(--text-muted);
}

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

@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 80px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 80px);
        background: rgba(10, 14, 23, 0.98);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        transition: left 0.4s ease;
    }
    
    .nav-links.active {
        left: 0;
    }
    
    .hamburger {
        display: flex;
    }
    
    .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);
    }
    
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
    
    .section-title h2 {
        font-size: 2rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
}

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

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

/* 图片样式 */
.img-responsive {
    width: 100%;
    height: auto;
    border-radius: 12px;
}

.card-img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 12px;
    margin-bottom: 1rem;
}