/*
科技感 IoT + AI 公司官网样式
主题：深色 / 蓝色点缀 / 渐变 / 粒子背景 / 响应式
*/

:root {
    --primary-dark: #0a0a0a;
    --secondary-dark: #121212;
    --accent-blue: #00d4ff;
    --light-text: #ffffff;
    --gray-text: #cccccc;
    --opacity-light: rgba(255, 255, 255, 0.8);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--primary-dark);
    color: var(--light-text);
    margin: 0;
    padding: 0;
}

/* 导航栏 */
.navbar {
    background-color: rgba(10, 10, 10, 0.95) !important;
    backdrop-filter: blur(10px);
    padding: 0.5rem 0;
}

.navbar-brand,
.nav-link {
    color: var(--light-text) !important;
    font-weight: 500;
}

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

/* Hero 横幅 */
.hero-banner {
    position: relative;
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--secondary-dark) 100%);
    overflow: hidden;
    min-height: 100vh;
    display: flex; align-items: center;
}

.particle-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(circle at 20% 80%, rgba(0, 212, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(0, 212, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(0, 212, 255, 0.05) 0%, transparent 50%);
    animation: float 20s infinite linear;
}

@keyframes float {
    0% { transform: translateY(0px) rotate(0deg); }
    100% { transform: translateY(-100px) rotate(360deg); }
}

.text-white { color: var(--light-text) !important; }
.opacity-90 { opacity: 0.9; }
.opacity-80 { opacity: 0.8; }

.btn-light {
    background-color: var(--accent-blue) !important;
    border-color: var(--accent-blue) !important;
    color: var(--primary-dark) !important;
    font-weight: 600;
    border-radius: 8px;
}

.btn-light:hover {
    background-color: #00b8e6 !important;
    border-color: #00b8e6 !important;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 212, 255, 0.3);
}

.btn-outline-light {
    border-color: var(--accent-blue) !important;
    color: var(--accent-blue) !important;
}

.btn-outline-light:hover {
    background-color: var(--accent-blue) !important;
    color: var(--primary-dark) !important;
}

/* 卡片样式 */
.card {
    background-color: rgba(18, 18, 18, 0.6) !important;
    border: 1px solid rgba(0, 212, 255, 0.3) !important;
    backdrop-filter: blur(10px);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    height: 100%;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 212, 255, 0.2);
}

.card-title {
    color: var(--accent-blue) !important;
}

/* 图片占位样式 */
.img-fluid.rounded-shadow {
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    border-radius: 12px;
}

.icon-placeholder {
    font-size: 3rem !important;
    margin-bottom: 1rem;
}

/* CTA 区块 */
.bg-primary {
    background-color: var(--primary-dark) !important;
}

.bg-primary .btn-light {
    background-color: var(--accent-blue) !important;
    border-color: var(--accent-blue) !important;
}

/* 提交按钮样式 */
.btn-primary {
    background-color: var(--accent-blue) !important;
    border-color: var(--accent-blue) !important;
    color: var(--primary-dark) !important;
    font-weight: 600;
    border-radius: 8px;
}

.btn-primary:hover {
    background-color: #00b8e6 !important;
    border-color: #00b8e6 !important;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 212, 255, 0.3);
}

/* 页脚 */
footer {
    background-color: #000000 !important;
    border-top: 1px solid rgba(0, 212, 255, 0.2);
}

/* 备案信息样式 */
.footer-legal a {
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-legal a:hover {
    color: var(--accent-blue) !important;
    text-decoration: underline;
}

/* 备案图标 */
.beian-icon {
    display: inline-block;
    width: 16px;
    height: 16px;
    margin-right: 5px;
    vertical-align: middle;
    background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="%2300d4ff"><path d="M12 2C6.48 2 2 6.48 2 12s4.48 10 10 10 10-4.48 10-10S17.52 2 12 2zm-2 15l-5-5 1.41-1.41L10 14.17l7.59-7.59L19 8l-9 9z"/></svg>');
    background-size: contain;
}

/* 公安备案图标 */
.gongan-icon {
    display: inline-block;
    width: 16px;
    height: 16px;
    margin-right: 5px;
    vertical-align: middle;
    background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="%2300d4ff"><path d="M12 1L3 5v6c0 5.55 3.84 10.74 9 12 5.16-1.26 9-6.45 9-12V5l-9-4zm0 10.99h7c-.53 4.12-3.28 7.79-7 8.94V12H5V6.3l7-3.11v8.8z"/></svg>');
    background-size: contain;
}

/* 响应式优化 */
@media (max-width: 768px) {
    .display-4 {
        font-size: 2.5rem;
    }
    .hero-banner {
        text-align: center;
        padding: 2rem 1rem;
    }
}