/* 全局重置与基础样式 */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font-family: 'Noto Sans SC', sans-serif; line-height: 1.6; color: #f0f0f0; background-color: #0a0a0a; overflow-x: hidden; }
.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.section { padding: 100px 0; position: relative; z-index: 2; }
.section:nth-child(even) { background-color: rgba(20, 20, 20, 0.7); }
.section-title { font-size: 3rem; text-align: center; margin-bottom: 1.5rem; color: #ffffff; font-weight: 900; letter-spacing: -0.5px; }
.section-title span { color: #4cc9f0; position: relative; display: inline-block; }
.section-title span::after { content: ''; position: absolute; bottom: 8px; left: 0; width: 100%; height: 10px; background-color: rgba(76, 201, 240, 0.25); z-index: -1; border-radius: 2px; }
.section-subtitle { text-align: center; color: #b0b0b0; font-size: 1.2rem; margin-bottom: 70px; max-width: 700px; margin-left: auto; margin-right: auto; font-weight: 300; }

/* 粒子背景 */
#particles-js { position: fixed; width: 100%; height: 100%; top: 0; left: 0; z-index: 0; background-color: #121212; }

/* ==================== 【布局修复】导航栏与首页间距调整 ==================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(18, 18, 18, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    z-index: 1000; /* 确保导航栏在最上层 */
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}
.nav-container { display: flex; justify-content: space-between; align-items: center; padding: 15px 5%; max-width: 1400px; margin: 0 auto; }
.company-logo { height: 72px; width: auto; max-width: 280px; object-fit: contain; filter: brightness(1.05); transition: all 0.3s ease; }
.company-logo:hover { filter: brightness(1.2); }
.nav-menu { display: flex; list-style: none; }
.nav-menu li { margin-left: 48px; }
.nav-menu a { text-decoration: none; color: #e0e0e0; font-weight: 500; font-size: 1.05rem; display: flex; align-items: center; transition: all 0.3s ease; position: relative; padding: 8px 0; }
.nav-menu a i { margin-right: 10px; font-size: 1rem; opacity: 0.8; }
.nav-menu a::after { content: ''; position: absolute; bottom: 0; left: 0; width: 0; height: 2px; background: linear-gradient(90deg, #4cc9f0, #4361ee); transition: width 0.4s ease; }
.nav-menu a:hover { color: #ffffff; }
.nav-menu a:hover::after { width: 100%; }
.nav-toggle { display: none; font-size: 1.6rem; cursor: pointer; color: #e0e0e0; background: none; border: none; }

/* 首页Hero区域 */
.hero {
    height: 100vh;
    min-height: 700px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding-top: 100px;
    isolation: isolate;
    /* 【关键修复】为固定的导航栏预留空间，防止内容被遮挡 */
    margin-top: 80px;
    z-index: 1;
}
.hero::before { content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 100%; background: radial-gradient(circle at 20% 50%, rgba(76, 201, 240, 0.15) 0%, transparent 50%), radial-gradient(circle at 80% 20%, rgba(67, 97, 238, 0.1) 0%, transparent 50%); z-index: -1; }
.hero-content { position: relative; z-index: 5; text-align: center; color: white; padding: 0 20px; max-width: 1000px; display: flex; flex-direction: column; align-items: center; }
.hero-brand-image { width: 85%; max-width: 850px; margin-bottom: 20px; opacity: 0; transform: scale(0.3); }
.hero-brand-image img { width: 100%; height: auto; display: block; filter: drop-shadow(0 15px 35px rgba(0, 0, 0, 0.6)); }
@keyframes scaleIn { from { opacity: 0; transform: scale(0.3); } to { opacity: 1; transform: scale(1); } }
.scale-in { animation: scaleIn 1.5s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards; }
.hero-subtitle { font-size: 1.4rem; margin-top: 10px; margin-bottom: 40px; color: #cccccc; max-width: 700px; margin-left: auto; margin-right: auto; font-weight: 300; line-height: 1.7; }
.cta-button { display: inline-flex; align-items: center; background: linear-gradient(90deg, #4361ee, #3a0ca3); color: white; padding: 20px 50px; border-radius: 50px; text-decoration: none; font-weight: 600; font-size: 1.2rem; box-shadow: 0 10px 30px rgba(67, 97, 238, 0.4), inset 0 1px 1px rgba(255, 255, 255, 0.2); transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1); border: none; cursor: pointer; position: relative; overflow: hidden; z-index: 1; }
.cta-button::before { content: ''; position: absolute; top: 0; left: -100%; width: 100%; height: 100%; background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent); transition: left 0.7s ease; z-index: -1; }
.cta-button:hover { transform: translateY(-8px) scale(1.03); box-shadow: 0 20px 40px rgba(67, 97, 238, 0.6); }
.cta-button:hover::before { left: 100%; }
.cta-button i { margin-left: 12px; transition: transform 0.4s ease; }
.cta-button:hover i { transform: translateX(8px); }

/* ==================== 【布局调整】首页向下箭头样式 ==================== */
.scroll-hint-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin-top: 60px; /* 控制箭头与上方按钮的间距 */
    width: 100%;
}
.scroll-hint {
    position: relative; /* 改为相对定位，使其在容器中正常排列 */
    transform: none; /* 移除原来的水平居中变换 */
    left: auto;
    bottom: auto;
    color: rgba(255, 255, 255, 0.7);
    font-size: 2rem;
    animation: bounce 2.5s infinite;
    transition: color 0.3s;
    display: block; /* 确保它独占一行 */
}
.scroll-hint:hover { color: #4cc9f0; }
/* 微调原有的bounce动画，移除水平位移 */
@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-15px); }
    60% { transform: translateY(-7px); }
}

/* 背景装饰形状 */
.hero-visual { position: absolute; top: 0; left: 0; width: 100%; height: 100%; z-index: 1; pointer-events: none; }
.shape { position: absolute; background: linear-gradient(45deg, rgba(76, 201, 240, 0.1), rgba(67, 97, 238, 0.05)); border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%; filter: blur(40px); animation: float 20s infinite ease-in-out; }
.shape-1 { width: 500px; height: 500px; top: 10%; right: 5%; animation-delay: 0s; }
.shape-2 { width: 400px; height: 400px; bottom: 15%; left: 5%; animation-delay: -5s; border-radius: 60% 40% 30% 70% / 60% 30% 70% 40%; }
.shape-3 { width: 300px; height: 300px; top: 50%; left: 50%; transform: translate(-50%, -50%); animation-delay: -10s; border-radius: 40% 60% 70% 30% / 40% 50% 60% 50%; }
@keyframes float { 0%, 100% { transform: translate(0, 0) rotate(0deg); } 33% { transform: translate(30px, -50px) rotate(120deg); } 66% { transform: translate(-20px, 20px) rotate(240deg); } }

/* 关于我们、业务、案例、联系等区域样式 (保持不变) */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: start; }
.about-text h3 { font-size: 2rem; margin-bottom: 25px; color: #ffffff; font-weight: 700; }
.about-text p { margin-bottom: 25px; color: #d0d0d0; line-height: 1.9; font-size: 1.1rem; }
.about-stats { display: flex; justify-content: space-between; margin-top: 50px; padding-top: 30px; border-top: 1px solid rgba(255, 255, 255, 0.1); }
.stat { text-align: center; flex: 1; }
.stat-number { font-size: 3.5rem; font-weight: 900; color: #4cc9f0; line-height: 1; margin-bottom: 5px; background: linear-gradient(90deg, #4cc9f0, #4361ee); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat-number span { font-size: 2rem; }
.stat-text { font-size: 1rem; color: #aaaaaa; font-weight: 300; letter-spacing: 1px; }
.about-poster { background: linear-gradient(135deg, rgba(30, 30, 50, 0.9), rgba(20, 20, 40, 0.9)); border-radius: 25px; padding: 60px 50px; box-shadow: 0 30px 60px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.05); border: 1px solid rgba(76, 201, 240, 0.2); position: relative; overflow: hidden; backdrop-filter: blur(10px); min-height: 400px; display: flex; align-items: center; }
.about-poster::before { content: ''; position: absolute; top: 0; right: 0; width: 200px; height: 200px; background: radial-gradient(circle, rgba(76, 201, 240, 0.15) 0%, transparent 70%); z-index: 0; }
.poster-content { position: relative; z-index: 1; color: white; }
.poster-content h3 { font-size: 2.2rem; margin-bottom: 25px; color: #ffffff; font-weight: 700; display: flex; align-items: center; }
.poster-content h3 i { color: #ffd700; margin-right: 15px; font-size: 1.8rem; }
.poster-content p { font-size: 1.2rem; line-height: 1.8; color: #d0d0d0; margin-bottom: 40px; }
.poster-features { list-style: none; }
.poster-features li { margin-bottom: 20px; font-size: 1.1rem; display: flex; align-items: center; color: #cccccc; }
.poster-features li i { color: #4cc9f0; margin-right: 15px; font-size: 1.2rem; }
.services-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 40px; }
.service-card { background: linear-gradient(145deg, rgba(40, 40, 40, 0.8), rgba(30, 30, 30, 0.8)); border-radius: 20px; padding: 50px 35px 40px; box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2), inset 0 1px 0 rgba(255, 255, 255, 0.05); transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1); position: relative; overflow: hidden; border: 1px solid rgba(255, 255, 255, 0.05); }
.service-card::before { content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 5px; background: linear-gradient(90deg, var(--card-color), transparent); }
.service-card:hover { transform: translateY(-20px) scale(1.02); box-shadow: 0 30px 60px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(255, 255, 255, 0.1); background: linear-gradient(145deg, rgba(50, 50, 50, 0.9), rgba(35, 35, 35, 0.9)); }
.service-icon { width: 80px; height: 80px; background: linear-gradient(135deg, var(--card-color), #2a2a2a); border-radius: 20px; display: flex; align-items: center; justify-content: center; margin-bottom: 30px; color: white; font-size: 2rem; box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2); }
.service-card h3 { margin: 0 0 20px; color: #ffffff; font-size: 1.7rem; font-weight: 700; }
.service-card p { margin: 0; color: #b0b0b0; line-height: 1.7; font-size: 1.05rem; }
.portfolio-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(360px, 1fr)); gap: 40px; }
.portfolio-item { background: linear-gradient(145deg, rgba(40, 40, 40, 0.8), rgba(30, 30, 30, 0.8)); border-radius: 20px; overflow: hidden; box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2); transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1); border: 1px solid rgba(255, 255, 255, 0.05); min-height: 300px; }
.portfolio-item:hover { transform: translateY(-15px); box-shadow: 0 30px 60px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(76, 201, 240, 0.2); }
.portfolio-img { height: 220px; background-size: cover; background-position: center; position: relative; overflow: hidden; }
.portfolio-overlay { position: absolute; bottom: 0; left: 0; width: 100%; padding: 35px 30px; background: linear-gradient(transparent, rgba(20, 20, 20, 0.95)); color: white; }
.portfolio-overlay h3 { font-size: 1.6rem; margin-bottom: 12px; color: #ffffff; }
.portfolio-overlay p { color: #aaaaaa; font-size: 1rem; line-height: 1.6; }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: start; }
.contact-info h3 { font-size: 2rem; margin-bottom: 25px; color: #ffffff; display: flex; align-items: center; font-weight: 700; }
.contact-info h3 i { margin-right: 20px; color: #4cc9f0; font-size: 1.8rem; }
.contact-info p { margin-bottom: 40px; color: #d0d0d0; line-height: 1.8; font-size: 1.1rem; }
.contact-details p { margin-bottom: 20px; display: flex; align-items: flex-start; color: #cccccc; font-size: 1.05rem; }
.contact-details i { color: #4cc9f0; margin-right: 20px; width: 24px; text-align: center; margin-top: 5px; font-size: 1.1rem; }
/* ==================== 【功能增强】QQ链接样式 ==================== */
.contact-details .qq-link {
    color: #12B7F5; /* QQ品牌蓝色 */
    text-decoration: none;
    margin-left: 5px;
    border-bottom: 1px dotted #12B7F5;
    transition: all 0.3s ease;
}
.contact-details .qq-link:hover {
    color: #4cc9f0;
    border-bottom-style: solid;
}
.qrcode { margin-top: 50px; text-align: center; padding: 30px; background: rgba(40, 40, 40, 0.5); border-radius: 15px; border: 1px solid rgba(255, 255, 255, 0.05); }
.qrcode img { max-width: 180px; border-radius: 10px; box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3); margin-bottom: 15px; background: white; padding: 12px; }
.qrcode p { font-size: 1rem; color: #aaaaaa; font-weight: 300; }
.contact-form { background: linear-gradient(145deg, rgba(40, 40, 40, 0.9), rgba(30, 30, 30, 0.9)); padding: 60px 50px; border-radius: 25px; box-shadow: 0 30px 60px rgba(0, 0, 0, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.05); border: 1px solid rgba(255, 255, 255, 0.05); backdrop-filter: blur(10px); }
.form-group { margin-bottom: 35px; }
.form-group label { display: block; margin-bottom: 12px; font-weight: 500; color: #e0e0e0; font-size: 1.05rem; }
.form-group input, .form-group select, .form-group textarea { width: 100%; padding: 18px 22px; border: 1px solid rgba(255, 255, 255, 0.1); border-radius: 12px; font-family: 'Noto Sans SC', sans-serif; font-size: 1.05rem; transition: all 0.4s ease; background-color: rgba(20, 20, 20, 0.7); color: #f0f0f0; }
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { outline: none; border-color: #4cc9f0; box-shadow: 0 0 0 3px rgba(76, 201, 240, 0.15); background-color: rgba(30, 30, 30, 0.9); }
.submit-btn { width: 100%; background: linear-gradient(90deg, #4361ee, #3a0ca3); color: white; border: none; padding: 22px; border-radius: 12px; font-size: 1.2rem; font-weight: 600; cursor: pointer; transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1); display: flex; align-items: center; justify-content: center; margin-top: 20px; box-shadow: 0 10px 30px rgba(67, 97, 238, 0.3); }
.submit-btn:hover { transform: translateY(-5px); box-shadow: 0 20px 40px rgba(67, 97, 238, 0.5); }
.submit-btn i { margin-left: 15px; transition: transform 0.4s ease; }
.submit-btn:hover i { transform: translateX(8px); }
.footer { background-color: #0a0a0a; color: #888; padding: 80px 0 40px; position: relative; z-index: 2; border-top: 1px solid rgba(255, 255, 255, 0.05); }
.footer-content { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; margin-bottom: 50px; padding-bottom: 40px; border-bottom: 1px solid rgba(255, 255, 255, 0.05); }
.logo-mini { font-size: 2.5rem; font-weight: 900; color: white; margin-bottom: 15px; font-family: 'Noto Sans SC', serif; background: linear-gradient(90deg, #4cc9f0, #4361ee); -webkit-background-clip: text; background-clip: text; color: transparent; }
.footer-logo p { color: #aaa; font-size: 1.05rem; letter-spacing: 1px; }
.footer-links { display: flex; gap: 40px; }
.footer-links a { color: #bbb; text-decoration: none; font-weight: 500; font-size: 1.05rem; transition: all 0.3s ease; position: relative; padding: 5px 0; }
.footer-links a::after { content: ''; position: absolute; bottom: 0; left: 0; width: 0; height: 2px; background: #4cc9f0; transition: width 0.4s ease; }
.footer-links a:hover { color: #ffffff; }
.footer-links a:hover::after { width: 100%; }
.footer-social { display: flex; gap: 25px; }
.footer-social a { display: inline-flex; align-items: center; justify-content: center; width: 50px; height: 50px; background: rgba(255, 255, 255, 0.05); border-radius: 50%; color: #ccc; font-size: 1.4rem; transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1); border: 1px solid rgba(255, 255, 255, 0.05); }
.footer-social a:hover { background: #4cc9f0; color: #0a0a0a; transform: translateY(-8px) rotate(10deg); box-shadow: 0 15px 30px rgba(76, 201, 240, 0.4); }
.footer-bottom { text-align: center; color: #666; font-size: 0.95rem; line-height: 1.8; font-weight: 300; }
.footer-bottom p:first-child { margin-bottom: 10px; }

/* 响应式设计 */
@media (max-width: 1200px) { .hero-brand-image { max-width: 700px; } .company-logo { height: 65px; } }
@media (max-width: 992px) {
    .hero-brand-image { max-width: 600px; margin-bottom: 15px; }
    .company-logo { height: 58px; }
    .about-grid, .contact-grid { grid-template-columns: 1fr; gap: 60px; }
    .services-grid { grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); }
    .portfolio-grid { grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); }
    .about-poster { min-height: 350px; padding: 50px 40px; }
    .poster-content h3 { font-size: 1.8rem; }
    .scroll-hint-container { margin-top: 40px; }
}
@media (max-width: 768px) {
    .section { padding: 80px 0; }
    .section-title { font-size: 2.2rem; }
    .section-subtitle { font-size: 1.1rem; margin-bottom: 50px; }
    .nav-menu {
        position: fixed; top: 80px; left: -100%; flex-direction: column;
        background-color: rgba(18, 18, 18, 0.98); backdrop-filter: blur(20px);
        width: 100%; text-align: center; transition: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        padding: 30px 0; border-top: 1px solid rgba(255, 255, 255, 0.05);
        box-shadow: 0 20px 40px rgba(0,0,0,0.3);
    }
    .nav-menu.active { left: 0; }
    .nav-menu li { margin: 20px 0; }
    .nav-toggle { display: block; }
    .hero {
        margin-top: 80px; /* 移动端保持间距 */
        min-height: 600px;
        padding-top: 20px; /* 减少内边距，因为外边距已提供空间 */
    }
    .hero-brand-image { max-width: 90%; margin-bottom: 10px; }
    .hero-brand-image img { filter: drop-shadow(0 8px 20px rgba(0, 0, 0, 0.5)); }
    .company-logo { height: 50px; }
    .cta-button { padding: 18px 40px; font-size: 1.1rem; }
    .about-stats { flex-direction: column; gap: 30px; }
    .stat-number { font-size: 3rem; }
    .footer-content { flex-direction: column; gap: 40px; text-align: center; }
    .footer-links { justify-content: center; flex-wrap: wrap; gap: 20px; }
    .footer-social { justify-content: center; }
    .contact-form { padding: 40px 30px; }
    .about-poster { padding: 40px 30px; }
    .shape-1, .shape-2, .shape-3 { display: none; }
    .nav-container { padding: 12px 5%; }
    .scroll-hint-container { margin-top: 30px; }
    .scroll-hint { font-size: 1.8rem; }
}