/* ====================
           全局变量与重置
           ==================== */
:root {
    --bg-deep: #050b14;
    --bg-dark: #0f172a;
    --bg-card: rgba(30, 41, 59, 0.7);
    --primary: #06b6d4;
    --secondary: #8b5cf6;
    --accent: #f472b6;
    --text-main: #e2e8f0;
    --text-secondary: #94a3b8;
    --white: #f8fafc;
    --gradient-cosmic: linear-gradient(135deg, #0b1a3a 0%, #050b14 100%);
    --neon-glow: 0 0 20px rgba(6, 182, 212, 0.5), 0 0 40px rgba(139, 92, 246, 0.3);
    --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --section-padding: 120px 0;
    --container-width: 1200px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--bg-deep);
    color: var(--text-secondary);
    line-height: 1.8;
    overflow-x: hidden;
    position: relative;
    z-index: 1;
}

/* ====================
   动态星空背景 (Canvas + CSS混合)
   ==================== */
.starry-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
    background: var(--gradient-cosmic);
    pointer-events: none;
}

#star-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: block;
}

.nebula {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.3;
    animation: nebula-float 25s ease-in-out infinite;
}

.nebula-1 {
    width: 700px; height: 700px;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.3) 0%, transparent 70%);
    top: -150px; right: -150px; animation-delay: 0s;
}

.nebula-2 {
    width: 600px; height: 600px;
    background: radial-gradient(circle, rgba(6, 182, 212, 0.2) 0%, transparent 70%);
    bottom: -100px; left: -100px; animation-delay: -8s;
}

.nebula-3 {
    width: 500px; height: 500px;
    background: radial-gradient(circle, rgba(244, 114, 182, 0.15) 0%, transparent 70%);
    top: 40%; left: 40%; transform: translate(-50%, -50%); animation-delay: -15s;
}

@keyframes nebula-float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(30px, -30px) scale(1.1); }
    66% { transform: translate(-20px, 20px) scale(0.95); }
}

.glow-orb {
    position: absolute; border-radius: 50%; filter: blur(60px);
    animation: pulse-glow 6s ease-in-out infinite; pointer-events: none;
}

.glow-orb-1 { width: 300px; height: 300px; background: var(--primary); opacity: 0.08; top: 20%; left: 10%; }
.glow-orb-2 { width: 250px; height: 250px; background: var(--secondary); opacity: 0.06; top: 70%; right: 10%; animation-delay: 3s; }

@keyframes pulse-glow {
    0%, 100% { transform: scale(1); opacity: 0.08; }
    50% { transform: scale(1.3); opacity: 0.15; }
}

/* 通用样式 */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: rgba(15, 23, 42, 0.5); }
::-webkit-scrollbar-thumb { background: linear-gradient(to bottom, var(--primary), var(--secondary)); border-radius: 4px; }

main { position: relative; z-index: 2; }
section { position: relative; z-index: 2; }
.container { width: 90%; max-width: var(--container-width); margin: 0 auto; padding: 0 20px; position: relative; z-index: 5; }

.section-title {
    font-size: 2.5rem; color: var(--white); margin-bottom: 50px; position: relative;
    display: inline-block; font-weight: 700; text-shadow: 0 0 30px rgba(6, 182, 212, 0.5); z-index: 5;
}
.section-title::after {
    content: ''; display: block; width: 80px; height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    margin-top: 15px; border-radius: 2px; box-shadow: 0 0 10px rgba(6, 182, 212, 0.5);
}

.btn {
    display: inline-block; padding: 14px 32px; border: 2px solid var(--primary);
    border-radius: 8px; color: var(--primary); font-size: 1rem; font-weight: 600;
    cursor: pointer; background: rgba(6, 182, 212, 0.1); transition: var(--transition);
    backdrop-filter: blur(10px); position: relative; overflow: hidden; z-index: 10;
}
.btn:hover { background: rgba(6, 182, 212, 0.2); transform: translateY(-3px); box-shadow: var(--neon-glow); }
.btn-filled { background: linear-gradient(135deg, var(--primary), var(--secondary)); color: var(--white); }
.btn-filled:hover { background: linear-gradient(135deg, var(--secondary), var(--primary)); box-shadow: 0 0 30px rgba(139, 92, 246, 0.5); }

/* ====================
   修改后的导航栏 (去圆角，底部指示器)
   ==================== */
header {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(5, 11, 20, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.2);
}
header.scrolled {
    background: rgba(5, 11, 20, 0.95);
    border-bottom-color: rgba(6, 182, 212, 0.2);
    box-shadow: 0 8px 32px rgba(6, 182, 212, 0.1);
}

/* 移动菜单头部 - 桌面端隐藏 */
.mobile-menu-header {
    display: none;
}

.mobile-close-btn {
    display: none;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: var(--container-width);
    margin: 0 auto;
}

.logo {
    font-size: 1.6rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 10px;
    position: relative;
    text-decoration: none;
}

.logo-icon-wrapper {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 15px rgba(6, 182, 212, 0.4);
    position: relative;
    z-index: 2;
}

.logo i {
    color: var(--white);
    font-size: 1.2rem;
}

.logo-text {
    background: linear-gradient(135deg, var(--white), var(--text-main));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 1px;
    position: relative;
}

.nav-links {
    display: flex;
    gap: 40px;
    position: relative;
}

.nav-indicator {
    position: absolute;
    height: 3px;
    background: var(--primary);
    border-radius: 2px;
    bottom: -5px;
    left: 0;
    transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
    z-index: 0;
    box-shadow: 0 0 10px var(--primary);
    pointer-events: none;
}

.nav-links a {
    font-size: 0.95rem;
    color: var(--text-main);
    font-weight: 500;
    position: relative;
    padding: 8px 0;
    border-radius: 0;
    text-decoration: none;
    z-index: 1;
    transition: color 0.3s;
}

.nav-links a.active {
    color: var(--primary);
    text-shadow: 0 0 10px rgba(6, 182, 212, 0.6);
    font-weight: 600;
}

.mobile-toggle {
    display: none;
    color: var(--white);
    font-size: 1.5rem;
    cursor: pointer;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.05);
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}
.mobile-toggle:hover {
    background: rgba(6, 182, 212, 0.2);
    color: var(--primary);
}

/* Hero */
.hero { margin-top:100px; display: flex; align-items: center; position: relative; padding: 120px 0; overflow: hidden; z-index: 2; }
.hero-content { position: relative; z-index: 10; }
.hero-pre { color: var(--primary); font-family: 'Courier New', monospace; font-size: 1.1rem; margin-bottom: 25px; text-transform: uppercase; letter-spacing: 3px; text-shadow: 0 0 20px rgba(6, 182, 212, 0.5); }
.hero h1 { font-size: clamp(45px, 8vw, 80px); color: var(--white); line-height: 1.1; margin-bottom: 30px; font-weight: 800; text-shadow: 0 0 40px rgba(139, 92, 246, 0.3); }
.hero h1 span { background: linear-gradient(135deg, var(--primary), var(--secondary), var(--accent)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.hero-desc { font-size: 1.2rem; margin-bottom: 50px; color: var(--text-main); line-height: 1.9; }

/* About */
.about { padding: var(--section-padding); }
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.about-text p { margin-bottom: 25px; font-size: 1.05rem; color: var(--text-main); line-height: 1.9; position: relative; z-index: 5; }
.about-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; margin-top: 40px; padding-top: 40px; border-top: 1px solid rgba(6, 182, 212, 0.2); position: relative; z-index: 5; }
.stat-item { text-align: center; }
.stat-item h3 { color: var(--white); font-size: 2.5rem; font-weight: 700; background: linear-gradient(135deg, var(--primary), var(--secondary)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.stat-item span { font-size: 0.9rem; font-family: 'Courier New', monospace; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 2px; }
.about-img-wrapper { position: relative; z-index: 5; }
.about-img-wrapper img { width: 100%; border-radius: 12px; filter: brightness(0.9) contrast(1.1); transition: var(--transition); position: relative; z-index: 2; box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4); }
.about-img-wrapper:hover img { transform: scale(1.02); }
.about-img-wrapper::before { content: ''; position: absolute; width: 100%; height: 100%; background: linear-gradient(135deg, var(--primary), var(--secondary)); border-radius: 12px; top: 20px; left: -20px; z-index: 1; opacity: 0.6; filter: blur(20px); transition: var(--transition); }

/* Services */
.services { padding: var(--section-padding); }
.services-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 30px; }
.service-card { background: rgba(15, 23, 42, 0.6); backdrop-filter: blur(10px); border: 1px solid rgba(6, 182, 212, 0.2); padding: 40px 30px; border-radius: 16px; transition: var(--transition); cursor: pointer; position: relative; overflow: hidden; z-index: 5; }
.service-card:hover { transform: translateY(-10px); border-color: rgba(6, 182, 212, 0.5); box-shadow: var(--neon-glow); }
.service-icon { width: 70px; height: 70px; float: left; background: linear-gradient(135deg, var(--primary), var(--secondary)); border-radius: 12px; display: flex; align-items: center; justify-content: center; font-size: 1.8rem; color: var(--white); margin-bottom: 20px; box-shadow: var(--neon-glow); position: relative; z-index: 2; }
.service-card h3 { color: var(--white); margin-bottom: 15px; font-size: 1.4rem; position: relative; z-index: 2; padding-top: 15px; padding-left: 85px}
.service-card p { font-size: 0.95rem; color: var(--text-secondary); line-height: 1.8; position: relative; z-index: 2; margin-top:40px}

/* Cases */
.cases { padding: var(--section-padding); }
.case-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 30px;
}
.case-card { border-radius: 16px; overflow: hidden; background: rgba(15, 23, 42, 0.6); backdrop-filter: blur(10px); border: 1px solid rgba(6, 182, 212, 0.1); transition: var(--transition); position: relative; z-index: 5; }
.case-img { width: 100%; height: 240px; object-fit: cover; transition: var(--transition); position: relative; z-index: 2; }
.case-card:hover { transform: translateY(-10px); box-shadow: var(--neon-glow); border-color: rgba(6, 182, 212, 0.3); }
.case-card:hover .case-img { transform: scale(1.1); filter: brightness(1.1); }
.case-content { padding: 30px; position: relative; z-index: 2; }
.case-tags { font-size: 0.8rem; color: var(--primary); font-family: 'Courier New', monospace; margin-bottom: 12px; display: block; text-transform: uppercase; letter-spacing: 2px; }
.case-content h3 { color: var(--white); font-size: 1.3rem; margin-bottom: 12px; }
.case-content p { font-size: 0.95rem; color: var(--text-secondary); line-height: 1.7; }
.case-link { display: inline-flex; align-items: center; margin-top: 20px; color: var(--primary); font-size: 0.9rem; font-weight: 500; gap: 8px; transition: var(--transition); }
.case-link:hover { gap: 15px; text-shadow: 0 0 20px rgba(6, 182, 212, 0.5); }

/* Partners - 完全清除文字特效，只保留图片效果 */
.partners { padding: var(--section-padding); }
.partners-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}
.partner-card {
    background: rgba(15, 23, 42, 0.6); backdrop-filter: blur(10px); transition: var(--transition); position: relative; z-index: 5;
}
.partner-img {
    width: 100%; height: 185px; object-fit: cover; transition: var(--transition); position: relative; z-index: 2; background: rgba(15, 23, 42, 0.6); backdrop-filter: blur(10px); border-radius: 16px;
}
.partner-card:hover { transform: translateY(-10px); box-shadow: var(--neon-glow); }
.partner-card:hover .partner-img { transform: scale(1.1); filter: brightness(1.1); }
.partner-content { padding: 10px 20px; position: relative; z-index: 2; }
.partner-content .case-tags { font-size: 0.8rem; color: var(--primary); font-family: 'Courier New', monospace; margin-bottom: 12px; display: block; text-transform: uppercase; letter-spacing: 2px; }
.partner-content h3 { color: var(--white); font-size: 1.3rem; margin-bottom: 10px; }
.partner-content p { font-size: 0.95rem; color: var(--text-secondary); line-height: 1.7; }
/* 完全移除文字部分的悬停效果，包括标签、标题、段落和链接 */
.partner-content .case-tags:hover,
.partner-content h3:hover,
.partner-content p:hover,
.partner-content .case-link:hover {
    text-shadow: none;
    gap: 8px;
    transition: none;
}
.partner-content .case-link {
    display: inline-flex;
    align-items: center;
    margin-top: 10px;
    color: var(--primary);
    font-size: 0.9rem;
    font-weight: 500;
    gap: 8px;
    transition: none; /* 移除所有过渡效果 */
    text-decoration: none;
}

/* Contact */
.contact { padding: var(--section-padding); text-align: left; }
.contact-desc { margin-bottom: 50px; font-size: 1.15rem; color: var(--text-main); line-height: 1.9; position: relative; z-index: 5; }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: start; }
.contact-info { display: flex; flex-direction: column; gap: 25px; }
.info-card { background: rgba(15, 23, 42, 0.6); backdrop-filter: blur(10px); border: 1px solid rgba(6, 182, 212, 0.2); padding: 25px; border-radius: 16px; transition: var(--transition); display: flex; align-items: flex-start; gap: 20px; }
.info-card:hover { transform: translateY(-5px); border-color: rgba(6, 182, 212, 0.5); box-shadow: var(--neon-glow); }
.info-icon { width: 60px; height: 60px; margin-top: 5px; background: linear-gradient(135deg, var(--primary), var(--secondary)); border-radius: 12px; display: flex; align-items: center; justify-content: center; font-size: 1.3rem; color: var(--white); box-shadow: var(--neon-glow); flex-shrink: 0; }
.info-content h3 { color: var(--white); font-size: 1.2rem; margin-bottom: 8px; }
.info-content p { font-size: 0.95rem; color: var(--text-secondary); line-height: 1.7; }
.contact-form { background: rgba(15, 23, 42, 0.7); backdrop-filter: blur(20px); padding: 20px 50px; border-radius: 20px; border: 1px solid rgba(6, 182, 212, 0.2); text-align: left; box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3); position: relative; z-index: 5; }
.form-group { margin-bottom: 25px; position: relative; z-index: 5; }
.form-group label { display: block; color: var(--white); margin-bottom: 10px; font-size: 0.95rem; font-weight: 500; }
.form-control { width: 100%; padding: 15px 20px; background: rgba(10, 14, 23, 0.8); border: 1px solid rgba(6, 182, 212, 0.3); border-radius: 8px; color: var(--white); font-family: inherit; font-size: 1rem; transition: var(--transition); position: relative; z-index: 5; }
.form-control:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 20px rgba(6, 182, 212, 0.2); }

/* Footer - 调整后（移除社交图标） */
footer {
    background: rgba(10, 14, 23, 0.9);
    backdrop-filter: blur(20px);
    padding: 40px 0 30px 0;
    text-align: center;
    font-size: 0.85rem;
    border-top: 1px solid rgba(6, 182, 212, 0.1);
    position: relative;
    z-index: 10;
}

/* 移除社交链接，因此删除相关样式 */
.copyright {
    color: var(--text-secondary);
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    line-height: 1.6;
    font-size: 16px;
}

/* Responsive */
@media (max-width: 992px) {
    .partners-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .mobile-toggle { display: flex; }
    .nav-links {
        position: fixed;
        top: 0;
        right: 0;
        height: 100vh;
        width: 80%;
        background: rgba(5, 11, 20, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        justify-content: flex-start;
        align-items: center;
        transform: translateX(100%);
        transition: var(--transition);
        border-left: 1px solid rgba(6, 182, 212, 0.2);
        z-index: 999;
        padding-top: 0;
        overflow-y: auto;
    }
    .nav-links.active { transform: translateX(0); }
    .nav-indicator { display: none; }
    .mobile-menu-header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 20px 30px;
        border-bottom: 1px solid rgba(6, 182, 212, 0.2);
        margin-bottom: 20px;
        position: relative;
        min-height: 80px;
    }
    
    .mobile-close-btn {
        background: transparent;
        border: none;
        color: var(--white);
        font-size: 1.8rem;
        cursor: pointer;
        width: 45px;
        height: 45px;
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        transition: var(--transition);
        position: absolute;
        top: 15px;
        right: 15px;
        z-index: 1001;
    }
    
    .mobile-close-btn:hover {
        background: rgba(6, 182, 212, 0.3);
        color: var(--primary);
        transform: scale(1.1);
    }
    
    .nav-links a {
        font-size: 1.2rem;
        margin: 0;
        padding: 15px 30px;
        width: 80%;
        text-align: center;
    }
    .nav-links a.active {
        color: var(--primary);
        border-bottom: 2px solid var(--primary);
    }
    .about-grid { grid-template-columns: 1fr; }
    .about-stats { grid-template-columns: 1fr; text-align: left; }
    .hero { padding-top: 150px; }
    .contact-grid { grid-template-columns: 1fr; gap: 30px; }
    .contact-form { padding: 30px; }
    .partners-grid { grid-template-columns: 1fr; }
}