/* ================================================================
   乾维网数官网 - 深色科技风格 CSS
   参考知道创宇防御风格：深蓝/黑色背景 + 霓虹蓝光效 + 科技感动效
   ================================================================ */

:root {
    /* 主色系 */
    --brand-blue: #00c3ff;
    --brand-blue2: #0066cc;
    --brand-dark: #003080;
    --brand-glow: rgba(0, 195, 255, 0.3);
    --accent-cyan: #00e5ff;
    --accent-green: #00ff88;

    /* 背景 */
    --bg-dark: #050d1a;
    --bg-card: #0a1628;
    --bg-card2: #0d1f38;
    --bg-nav: rgba(5, 13, 26, 0.95);

    /* 文字 */
    --text-white: #ffffff;
    --text-light: #c8d8f0;
    --text-muted: #6a8ab0;

    /* 边框 / 分割线 */
    --border: rgba(0, 195, 255, 0.15);
    --border-bright: rgba(0, 195, 255, 0.4);

    /* 阴影 */
    --glow-sm: 0 0 10px rgba(0, 195, 255, 0.3);
    --glow-md: 0 0 20px rgba(0, 195, 255, 0.4), 0 0 40px rgba(0, 195, 255, 0.1);
    --glow-lg: 0 0 30px rgba(0, 195, 255, 0.5), 0 0 60px rgba(0, 195, 255, 0.2);

    --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4), 0 0 0 1px var(--border);
}

/* ===== 基础重置 ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', 'Segoe UI', sans-serif;
    background: var(--bg-dark);
    color: var(--text-light);
    line-height: 1.7;
    overflow-x: hidden;
}

/* ===== 全局网格背景 ===== */
body::before {
    content: '';
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background-image:
        linear-gradient(rgba(0, 195, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 195, 255, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    pointer-events: none;
    z-index: 0;
}

.container { max-width: 1100px; margin: 0 auto; padding: 0 32px; position: relative; z-index: 1; }

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    height: 72px;
    background: var(--bg-nav);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 48px;
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

.logo { display: flex; align-items: center; gap: 12px; }
.logo a { display: flex; align-items: center; gap: 12px; text-decoration: none; color: var(--text-white); }
.logo-icon {
    width: 42px; height: 42px;
    background: linear-gradient(135deg, var(--brand-blue2), var(--brand-blue));
    border-radius: 10px;
    display: flex; align-items: center; justify-content: center;
    font-weight: 800; font-size: 18px; color: white;
    box-shadow: var(--glow-sm);
}
.logo-icon img { width: 100%; height: 100%; object-fit: contain; border-radius: 10px; }
.logo-text { font-size: 17px; font-weight: 600; color: var(--text-white); letter-spacing: 0.5px; }

.nav-menu { display: flex; gap: 4px; list-style: none; }
.nav-link {
    color: var(--text-light);
    text-decoration: none;
    font-size: 14px;
    padding: 8px 16px;
    border-radius: 8px;
    transition: all 0.2s;
    white-space: nowrap;
}
.nav-link:hover { color: var(--brand-blue); background: rgba(0, 195, 255, 0.08); }
.nav-menu li { position: relative; }

.dropdown {
    display: none;
    position: absolute;
    top: calc(100% + 8px); left: 0;
    min-width: 220px;
    background: var(--bg-card);
    border: 1px solid var(--border-bright);
    border-radius: 12px;
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.6), var(--glow-sm);
    padding: 8px 0;
    z-index: 100;
}
.has-dropdown:hover .dropdown { display: block; }
.dropdown li { list-style: none; }
.dropdown a {
    display: flex; align-items: center; gap: 10px;
    padding: 11px 20px;
    color: var(--text-light);
    text-decoration: none; font-size: 14px;
    transition: all 0.2s;
}
.dropdown a:hover { background: rgba(0, 195, 255, 0.08); color: var(--brand-blue); }
.dropdown i { color: var(--brand-blue); font-size: 13px; }

/* 汉堡菜单 */
.menu-toggle {
    display: none; width: 44px; height: 44px;
    background: transparent; border: none; cursor: pointer;
}
.hamburger { display: block; width: 22px; height: 2px; background: var(--text-light); position: relative; transition: all 0.3s; }
.hamburger::before, .hamburger::after {
    content: ''; position: absolute; width: 22px; height: 2px; background: var(--text-light); transition: all 0.3s;
}
.hamburger::before { top: -7px; }
.hamburger::after { top: 7px; }
.menu-overlay { display: none; position: fixed; top: 0; left: 0; right: 0; bottom: 0; background: rgba(0,0,0,0.7); z-index: 998; }

/* ===== 流星效果 ===== */
.meteors { position: absolute; top: 0; left: 0; right: 0; bottom: 0; pointer-events: none; overflow: hidden; z-index: 1; }
.meteor {
    position: absolute;
    width: 2px; height: 100px;
    background: linear-gradient(180deg, rgba(0, 195, 255, 0.9), transparent);
    border-radius: 100px;
    animation: meteorFall linear infinite;
    opacity: 0;
}
.meteor::before {
    content: ''; position: absolute; top: 0; left: 50%;
    transform: translateX(-50%);
    width: 6px; height: 6px;
    background: var(--brand-blue);
    border-radius: 50%;
    box-shadow: 0 0 12px var(--brand-blue), 0 0 24px rgba(0, 195, 255, 0.6);
}
.meteor:nth-child(1) { left: 8%; animation-duration: 3.2s; animation-delay: 0s; }
.meteor:nth-child(2) { left: 20%; animation-duration: 4.1s; animation-delay: 1.2s; }
.meteor:nth-child(3) { left: 36%; animation-duration: 3.7s; animation-delay: 2.3s; }
.meteor:nth-child(4) { left: 52%; animation-duration: 4.6s; animation-delay: 0.7s; }
.meteor:nth-child(5) { left: 68%; animation-duration: 3.9s; animation-delay: 1.8s; }
.meteor:nth-child(6) { left: 82%; animation-duration: 4.3s; animation-delay: 3.1s; }
@keyframes meteorFall {
    0% { top: -120px; transform: translateX(0) rotate(-45deg); opacity: 0; }
    10% { opacity: 1; }
    80% { opacity: 0.8; }
    100% { top: 105%; transform: translateX(-280px) rotate(-45deg); opacity: 0; }
}

/* ===== 浮动粒子 ===== */
.particles { position: absolute; top: 0; left: 0; right: 0; bottom: 0; pointer-events: none; z-index: 1; }
.particle {
    position: absolute; width: 3px; height: 3px;
    background: var(--brand-blue);
    border-radius: 50%; opacity: 0.4;
    animation: particleFloat 12s ease-in-out infinite;
    box-shadow: 0 0 6px var(--brand-blue);
}
.particle:nth-child(1) { left: 5%; top: 20%; animation-delay: 0s; }
.particle:nth-child(2) { left: 15%; top: 60%; animation-delay: 1.2s; }
.particle:nth-child(3) { left: 25%; top: 40%; animation-delay: 2.5s; }
.particle:nth-child(4) { left: 35%; top: 80%; animation-delay: 3.8s; }
.particle:nth-child(5) { left: 45%; top: 30%; animation-delay: 4.7s; }
.particle:nth-child(6) { left: 55%; top: 70%; animation-delay: 5.6s; }
.particle:nth-child(7) { left: 65%; top: 50%; animation-delay: 6.9s; }
.particle:nth-child(8) { left: 75%; top: 25%; animation-delay: 7.3s; }
.particle:nth-child(9) { left: 85%; top: 55%; animation-delay: 8.4s; }
.particle:nth-child(10) { left: 92%; top: 35%; animation-delay: 9.8s; }
@keyframes particleFloat {
    0%, 100% { transform: translateY(0) translateX(0); opacity: 0.4; }
    25% { transform: translateY(-22px) translateX(12px); opacity: 0.7; }
    50% { transform: translateY(-12px) translateX(-8px); opacity: 0.5; }
    75% { transform: translateY(-28px) translateX(6px); opacity: 0.6; }
}

/* ===== Hero 区 ===== */
.hero {
    padding: 160px 60px 120px;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(0, 80, 160, 0.25) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 20%, rgba(0, 100, 200, 0.2) 0%, transparent 50%),
        linear-gradient(180deg, #080f1e 0%, var(--bg-dark) 100%);
    position: relative; overflow: hidden;
    min-height: 600px;
    display: flex; align-items: center; justify-content: center;
}
.hero::after {
    content: '';
    position: absolute; bottom: 0; left: 0; right: 0; height: 1px;
    background: linear-gradient(90deg, transparent, var(--brand-blue), transparent);
}

.hero-content { position: relative; z-index: 2; text-align: center; max-width: 860px; }

.hero-badge {
    display: inline-flex; align-items: center; gap: 8px;
    background: rgba(0, 195, 255, 0.1);
    border: 1px solid rgba(0, 195, 255, 0.3);
    border-radius: 20px;
    padding: 6px 16px; margin-bottom: 24px;
    font-size: 13px; color: var(--brand-blue);
    letter-spacing: 0.5px;
}
.hero-badge::before {
    content: '';
    width: 6px; height: 6px;
    background: var(--accent-green);
    border-radius: 50%;
    box-shadow: 0 0 8px var(--accent-green);
    animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse { 0%, 100% { opacity: 1; transform: scale(1); } 50% { opacity: 0.6; transform: scale(0.8); } }

.hero-title {
    font-size: 52px; font-weight: 800; margin-bottom: 20px;
    line-height: 1.25;
    background: linear-gradient(135deg, #ffffff 30%, var(--brand-blue) 100%);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: none;
}
.hero-subtitle {
    font-size: 18px; color: var(--text-muted);
    margin-bottom: 48px; line-height: 1.8;
    letter-spacing: 0.3px;
}
.hero-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

.btn-primary {
    background: linear-gradient(135deg, var(--brand-blue2), var(--brand-blue));
    color: white; padding: 14px 36px; border-radius: 8px;
    text-decoration: none; font-size: 15px; font-weight: 600;
    transition: all 0.3s;
    box-shadow: 0 4px 20px rgba(0, 102, 204, 0.4);
    position: relative; overflow: hidden;
}
.btn-primary::before {
    content: ''; position: absolute; top: 0; left: -100%; width: 100%; height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.15), transparent);
    transition: left 0.4s;
}
.btn-primary:hover::before { left: 100%; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(0, 195, 255, 0.4); }

.btn-secondary {
    background: transparent; color: var(--brand-blue);
    padding: 14px 36px; border-radius: 8px;
    border: 1px solid rgba(0, 195, 255, 0.5);
    text-decoration: none; font-size: 15px; font-weight: 600; transition: all 0.3s;
}
.btn-secondary:hover {
    background: rgba(0, 195, 255, 0.1);
    border-color: var(--brand-blue);
    box-shadow: var(--glow-sm);
    transform: translateY(-2px);
}

/* Hero 统计数字 */
.hero-stats {
    display: flex; justify-content: center; gap: 64px;
    margin-top: 64px; padding-top: 48px;
    border-top: 1px solid var(--border);
}
.stat-item { text-align: center; }
.stat-number {
    font-size: 38px; font-weight: 800; color: var(--brand-blue);
    line-height: 1;
    text-shadow: 0 0 20px rgba(0, 195, 255, 0.5);
}
.stat-label { font-size: 13px; color: var(--text-muted); margin-top: 8px; }

/* ===== 通用区块标题 ===== */
.section-title {
    font-size: 32px; font-weight: 700;
    text-align: center; margin-bottom: 16px;
    color: var(--text-white);
    position: relative;
}
.section-title::after {
    content: '';
    display: block; width: 48px; height: 3px;
    background: linear-gradient(90deg, var(--brand-blue2), var(--brand-blue));
    margin: 14px auto 0;
    border-radius: 2px;
    box-shadow: var(--glow-sm);
}
.section-subtitle {
    text-align: center; color: var(--text-muted);
    font-size: 15px; margin-bottom: 48px;
    max-width: 600px; margin-left: auto; margin-right: auto;
}

/* ===== 服务卡片区 ===== */
.services {
    padding: 100px 60px;
    max-width: 1200px; margin: 0 auto;
    position: relative; z-index: 1;
}
.services-grid {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
    margin-top: 48px;
}
.service-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px; padding: 32px;
    text-decoration: none; color: var(--text-light);
    transition: all 0.35s;
    text-align: left; position: relative; overflow: hidden;
}
.service-card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px;
    background: linear-gradient(90deg, var(--brand-blue2), var(--brand-blue));
    opacity: 0; transition: opacity 0.3s;
}
.service-card:hover {
    border-color: var(--border-bright);
    transform: translateY(-6px);
    box-shadow: var(--glow-md);
    background: var(--bg-card2);
}
.service-card:hover::before { opacity: 1; }
.service-icon {
    width: 56px; height: 56px;
    background: linear-gradient(135deg, rgba(0, 102, 204, 0.4), rgba(0, 195, 255, 0.2));
    border: 1px solid rgba(0, 195, 255, 0.3);
    border-radius: 14px;
    display: flex; align-items: center; justify-content: center;
    margin-bottom: 20px; transition: all 0.3s;
}
.service-card:hover .service-icon {
    background: linear-gradient(135deg, var(--brand-blue2), var(--brand-blue));
    box-shadow: var(--glow-sm);
    border-color: transparent;
}
.service-icon i { font-size: 22px; color: var(--brand-blue); transition: color 0.3s; }
.service-card:hover .service-icon i { color: white; }
.service-title { font-size: 18px; font-weight: 700; margin-bottom: 10px; color: var(--text-white); }
.service-desc { color: var(--text-muted); font-size: 14px; line-height: 1.7; }
.service-arrow {
    display: inline-flex; align-items: center; gap: 6px;
    color: var(--brand-blue); font-size: 13px; margin-top: 16px;
    opacity: 0; transform: translateX(-6px); transition: all 0.3s;
}
.service-card:hover .service-arrow { opacity: 1; transform: translateX(0); }

/* ===== 关于预览区 ===== */
.about-preview {
    background: var(--bg-card);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    position: relative; overflow: hidden;
}
.about-preview::before {
    content: '';
    position: absolute; top: 0; right: 0; width: 40%; height: 100%;
    background: radial-gradient(ellipse at right center, rgba(0, 102, 204, 0.15) 0%, transparent 70%);
    pointer-events: none;
}
.about-inner {
    max-width: 1200px; margin: 0 auto; padding: 80px 60px;
    display: flex; gap: 80px; align-items: center; position: relative; z-index: 1;
}
.about-content { flex: 1; }
.about-content h2 { font-size: 30px; font-weight: 700; margin-bottom: 16px; color: var(--text-white); }
.about-content p { color: var(--text-muted); margin-bottom: 24px; line-height: 1.8; font-size: 15px; }
.btn-link {
    color: var(--brand-blue); text-decoration: none; font-weight: 600; font-size: 14px;
    display: inline-flex; align-items: center; gap: 6px;
    border-bottom: 1px solid rgba(0, 195, 255, 0.3); padding-bottom: 2px;
    transition: all 0.2s;
}
.btn-link:hover { color: var(--accent-cyan); border-bottom-color: var(--accent-cyan); }
.stats-grid { display: flex; flex-direction: column; gap: 24px; min-width: 220px; }
.stat-card {
    background: var(--bg-dark); border: 1px solid var(--border);
    border-radius: 12px; padding: 20px 24px; text-align: center;
}
.stat-card .stat-number { font-size: 32px; font-weight: 800; color: var(--brand-blue); text-shadow: 0 0 16px rgba(0, 195, 255, 0.4); }
.stat-card .stat-label { color: var(--text-muted); font-size: 13px; margin-top: 4px; }

/* ===== 服务横幅/Banner ===== */
.banner {
    margin-top: 72px; padding: 80px 60px;
    background:
        radial-gradient(ellipse at 30% 50%, rgba(0, 80, 160, 0.3) 0%, transparent 60%),
        linear-gradient(135deg, #060e1e 0%, #0a1830 100%);
    color: #fff; text-align: center; position: relative; overflow: hidden;
}
.banner::before {
    content: '';
    position: absolute; bottom: 0; left: 0; right: 0; height: 1px;
    background: linear-gradient(90deg, transparent, var(--brand-blue), transparent);
}
.banner::after {
    content: '';
    position: absolute; top: 0; left: 0; right: 0; bottom: 0;
    background-image:
        linear-gradient(rgba(0, 195, 255, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 195, 255, 0.04) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
}
.banner h1 {
    font-size: 40px; font-weight: 800; margin-bottom: 16px;
    position: relative; z-index: 1;
    background: linear-gradient(135deg, #fff 40%, var(--brand-blue) 100%);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.banner p {
    font-size: 16px; color: var(--text-muted); max-width: 680px;
    margin: 0 auto; line-height: 1.8; position: relative; z-index: 1;
}

/* ===== 服务详情页通用 ===== */
.section { padding: 80px 0; position: relative; z-index: 1; }
.section.alt { background: var(--bg-card); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section h2 {
    font-size: 26px; font-weight: 700; text-align: center; margin-bottom: 12px; color: var(--text-white);
}
.section h2::after {
    content: ''; display: block; width: 36px; height: 2px;
    background: linear-gradient(90deg, var(--brand-blue2), var(--brand-blue));
    margin: 10px auto 0; border-radius: 2px;
}
.section > .container > p.section-desc {
    color: var(--text-muted); text-align: center; max-width: 800px;
    margin: 0 auto 40px; line-height: 1.8;
}

/* ===== 服务流程 ===== */
.flow {
    display: flex; gap: 16px; flex-wrap: wrap; justify-content: center; margin-top: 40px;
}
.flow-item {
    background: var(--bg-card2); border: 1px solid var(--border);
    border-radius: 12px; padding: 24px 20px;
    width: calc(20% - 14px); min-width: 170px; text-align: center;
    transition: all 0.3s; position: relative;
}
.flow-item:hover {
    border-color: var(--border-bright);
    box-shadow: var(--glow-sm);
    transform: translateY(-4px);
}
.flow-num {
    width: 40px; height: 40px;
    background: linear-gradient(135deg, var(--brand-blue2), var(--brand-blue));
    border-radius: 50%; color: #fff; font-size: 16px; font-weight: 700;
    display: flex; align-items: center; justify-content: center;
    margin: 0 auto 12px;
    box-shadow: var(--glow-sm);
}
.flow-item h4 { font-size: 15px; margin-bottom: 8px; color: var(--text-white); }
.flow-item p { font-size: 13px; color: var(--text-muted); line-height: 1.5; }

/* 流程连接线 */
.flow-item:not(:last-child)::after {
    content: '→';
    position: absolute; right: -14px; top: 50%;
    transform: translateY(-50%); color: var(--brand-blue);
    font-size: 16px; z-index: 1;
}
@media (max-width: 900px) { .flow-item::after { display: none; } }

/* ===== 优势卡片 ===== */
.grid4 {
    display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-top: 40px;
}
.card {
    background: var(--bg-card2); border: 1px solid var(--border);
    border-radius: 12px; padding: 28px 22px; text-align: center;
    transition: all 0.3s;
}
.card:hover {
    border-color: var(--border-bright);
    box-shadow: var(--glow-sm);
    transform: translateY(-4px);
    background: var(--bg-card);
}
.card-icon {
    width: 52px; height: 52px;
    background: linear-gradient(135deg, rgba(0, 102, 204, 0.4), rgba(0, 195, 255, 0.2));
    border: 1px solid rgba(0, 195, 255, 0.3);
    border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    margin: 0 auto 16px; transition: all 0.3s;
}
.card:hover .card-icon {
    background: linear-gradient(135deg, var(--brand-blue2), var(--brand-blue));
    box-shadow: var(--glow-sm); border-color: transparent;
}
.card-icon i { font-size: 20px; color: var(--brand-blue); transition: color 0.3s; }
.card:hover .card-icon i { color: white; }
.card h4 { font-size: 16px; margin-bottom: 8px; color: var(--text-white); font-weight: 600; }
.card p { font-size: 13px; color: var(--text-muted); line-height: 1.6; }

/* ===== 内容区 ===== */
.content-box { max-width: 820px; margin: 32px auto 0; color: var(--text-muted); }
.content-box h3 { font-size: 17px; color: var(--text-white); margin: 20px 0 10px; font-weight: 600; }
.content-box ul { padding-left: 20px; }
.content-box li { margin-bottom: 10px; line-height: 1.7; }
.content-box li::marker { color: var(--brand-blue); }
.content-box strong { color: var(--text-light); }
.content-box h2 { font-size: 20px !important; color: var(--text-white) !important; text-align: left !important; }
.content-box h2::after { display: none !important; }

/* ===== FAQ ===== */
.faq-box { max-width: 800px; margin: 32px auto 0; }
.faq-item {
    background: var(--bg-card2); border: 1px solid var(--border);
    border-radius: 10px; margin-bottom: 10px; overflow: hidden;
    transition: all 0.3s;
}
.faq-item:hover { border-color: var(--border-bright); }
.faq-q {
    padding: 16px 20px; cursor: pointer;
    display: flex; justify-content: space-between; align-items: center;
    font-size: 15px; color: var(--text-white); font-weight: 500;
    transition: background 0.2s;
}
.faq-q:hover { background: rgba(0, 195, 255, 0.05); }
.faq-q i { color: var(--brand-blue); font-size: 12px; transition: transform 0.3s; }
.faq-a {
    padding: 0 20px 16px;
    font-size: 14px; color: var(--text-muted); display: none;
    border-top: 1px solid var(--border); padding-top: 14px; margin-top: 0; line-height: 1.7;
}

/* ===== CTA 区 ===== */
.cta {
    background:
        radial-gradient(ellipse at center, rgba(0, 80, 160, 0.4) 0%, transparent 70%),
        var(--bg-card);
    border-top: 1px solid var(--border);
    padding: 72px 60px; text-align: center; color: #fff;
    position: relative; overflow: hidden;
}
.cta::before {
    content: '';
    position: absolute; top: 0; left: 0; right: 0; bottom: 0;
    background-image:
        linear-gradient(rgba(0, 195, 255, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 195, 255, 0.04) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
}
.cta h3 { font-size: 28px; margin-bottom: 12px; font-weight: 700; position: relative; z-index: 1; }
.cta p { color: var(--text-muted); margin-bottom: 28px; font-size: 15px; position: relative; z-index: 1; }
.cta a {
    display: inline-block;
    background: linear-gradient(135deg, var(--brand-blue2), var(--brand-blue));
    color: white; padding: 13px 32px; border-radius: 8px;
    text-decoration: none; font-weight: 600; font-size: 15px;
    box-shadow: 0 4px 20px rgba(0, 195, 255, 0.3);
    transition: all 0.3s; position: relative; z-index: 1;
}
.cta a:hover { transform: translateY(-2px); box-shadow: var(--glow-md); }

/* ===== 页脚 ===== */
.footer {
    padding: 32px 60px;
    background: #020710;
    border-top: 1px solid var(--border);
    color: var(--text-muted); text-align: center; font-size: 13px;
}
.footer a { color: var(--text-muted); text-decoration: none; transition: color 0.2s; }
.footer a:hover { color: var(--brand-blue); }
.footer-links { margin-top: 8px; }
.footer-links a { margin: 0 12px; }

/* ===== 关于/联系页面 ===== */
.page-header {
    padding: 140px 60px 60px;
    background:
        radial-gradient(ellipse at 30% 50%, rgba(0, 80, 160, 0.25) 0%, transparent 60%),
        linear-gradient(180deg, #070f20 0%, var(--bg-dark) 100%);
    position: relative; overflow: hidden;
}
.page-header::after {
    content: '';
    position: absolute; bottom: 0; left: 0; right: 0; height: 1px;
    background: linear-gradient(90deg, transparent, var(--brand-blue), transparent);
}
.page-title { font-size: 38px; font-weight: 800; color: var(--text-white); }
.page-body { max-width: 900px; margin: 0 auto; padding: 60px; }
.page-body h2 { font-size: 22px; margin: 32px 0 14px; color: var(--text-white); font-weight: 600; }
.page-body p { color: var(--text-muted); margin-bottom: 16px; line-height: 1.8; }
.page-body ul { margin: 14px 0; padding-left: 20px; }
.page-body li { margin-bottom: 10px; color: var(--text-muted); }
.page-body li::marker { color: var(--brand-blue); }

/* ===== 联系页面卡片 ===== */
.contact-cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; margin-top: 32px; }
.contact-card {
    background: var(--bg-card2); border: 1px solid var(--border);
    border-radius: 12px; padding: 28px;
    transition: all 0.3s;
}
.contact-card:hover { border-color: var(--border-bright); box-shadow: var(--glow-sm); }
.contact-card i { font-size: 24px; color: var(--brand-blue); margin-bottom: 12px; display: block; }
.contact-card h4 { font-size: 16px; color: var(--text-white); margin-bottom: 8px; font-weight: 600; }
.contact-card p { color: var(--text-muted); font-size: 14px; }

/* ===== 动画入场 ===== */
.fade-in { opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .services-grid { grid-template-columns: repeat(2, 1fr); }
    .about-inner { flex-direction: column; padding: 60px 32px; }
    .stats-grid { flex-direction: row; }
    .hero-stats { gap: 40px; }
}
@media (max-width: 768px) {
    .navbar { padding: 0 20px; }
    .menu-toggle { display: block; }
    .nav-wrapper {
        display: none; position: fixed; top: 0; right: 0; width: 280px; height: 100vh;
        background: var(--bg-card); border-left: 1px solid var(--border);
        padding: 80px 20px 20px; z-index: 999;
    }
    .nav-wrapper.active { display: block; }
    .menu-overlay.active { display: block; }
    .nav-menu { flex-direction: column; }
    .dropdown { position: static; display: none !important; box-shadow: none; border: none; background: transparent; }
    .has-dropdown.open .dropdown { display: block !important; }
    .hero { padding: 120px 24px 80px; }
    .hero-title { font-size: 34px; }
    .hero-subtitle { font-size: 15px; }
    .hero-buttons { flex-direction: column; align-items: center; }
    .hero-stats { flex-wrap: wrap; gap: 28px; }
    .services { padding: 60px 24px; }
    .services-grid { grid-template-columns: 1fr; gap: 16px; }
    .section-title { font-size: 24px; }
    .banner h1 { font-size: 28px; }
    .banner { padding: 60px 24px; margin-top: 72px; }
    .section { padding: 60px 0; }
    .flow { flex-direction: column; align-items: center; }
    .flow-item { width: 100%; max-width: 360px; }
    .flow-item::after { display: none; }
    .grid4 { grid-template-columns: repeat(2, 1fr); }
    .page-header { padding: 110px 24px 48px; }
    .page-body { padding: 40px 24px; }
    .contact-cards { grid-template-columns: 1fr; }
    .footer { padding: 24px 20px; }
    .cta { padding: 60px 24px; }
}
@media (max-width: 480px) {
    .hero-title { font-size: 28px; }
    .grid4 { grid-template-columns: 1fr; }
    .stats-grid { flex-direction: column; }
}