/* ================================================================
   乾维网数官网 - 白色科技风格 CSS（Light Tech Theme）
   主色系：纯白背景 + 深蓝科技蓝 + 流星/粒子动效
   高端大气，干净现代，适合网络安全企业官网
   ================================================================ */

:root {
    /* 主色系 */
    --brand-blue: #1665d8;
    --brand-blue2: #0a4fc4;
    --brand-blue-light: #4d8ef7;
    --brand-cyan: #00b4d8;
    --accent-cyan: #0096c7;

    /* 背景 */
    --bg-white: #ffffff;
    --bg-light: #f0f5ff;
    --bg-light2: #e8f0fd;
    --bg-section: #f7faff;
    --bg-card: #ffffff;
    --bg-nav: rgba(255, 255, 255, 0.97);

    /* 文字 */
    --text-dark: #0d1b3e;
    --text-main: #1a2b5e;
    --text-body: #3a4a6e;
    --text-muted: #6b7a9d;
    --text-light: #94a3b8;

    /* 边框 */
    --border: rgba(22, 101, 216, 0.1);
    --border-bright: rgba(22, 101, 216, 0.3);

    /* 阴影 */
    --shadow-sm: 0 2px 12px rgba(22, 101, 216, 0.08);
    --shadow-md: 0 6px 30px rgba(22, 101, 216, 0.12), 0 2px 8px rgba(0,0,0,0.06);
    --shadow-lg: 0 12px 48px rgba(22, 101, 216, 0.15), 0 4px 16px rgba(0,0,0,0.08);
    --shadow-card: 0 4px 24px rgba(22, 101, 216, 0.1), 0 1px 4px rgba(0,0,0,0.05);
    --glow-blue: 0 0 20px rgba(22, 101, 216, 0.2), 0 0 40px rgba(22, 101, 216, 0.08);
}

/* ===== 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-white);
    color: var(--text-body);
    line-height: 1.7;
    overflow-x: hidden;
}

/* ===== 全局几何装饰背景 ===== */
body::before {
    content: '';
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background-image:
        linear-gradient(rgba(22, 101, 216, 0.025) 1px, transparent 1px),
        linear-gradient(90deg, rgba(22, 101, 216, 0.025) 1px, transparent 1px);
    background-size: 56px 56px;
    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 2px 24px rgba(22, 101, 216, 0.08);
    transition: box-shadow 0.3s;
}
.navbar.scrolled {
    box-shadow: 0 4px 32px rgba(22, 101, 216, 0.14);
}

.logo { display: flex; align-items: center; gap: 12px; }
.logo a { display: flex; align-items: center; gap: 12px; text-decoration: none; color: var(--text-dark); }
.logo-icon {
    width: 42px; height: 42px;
    background: linear-gradient(135deg, var(--brand-blue2), var(--brand-blue-light));
    border-radius: 10px;
    display: flex; align-items: center; justify-content: center;
    font-weight: 800; font-size: 18px; color: white;
    box-shadow: 0 4px 14px rgba(22, 101, 216, 0.35);
}
.logo-icon img { width: 100%; height: 100%; object-fit: contain; border-radius: 10px; }
.logo-text { font-size: 17px; font-weight: 700; color: var(--text-dark); letter-spacing: 0.3px; }

.nav-menu { display: flex; gap: 4px; list-style: none; }
.nav-link {
    color: var(--text-body);
    text-decoration: none;
    font-size: 14px;
    padding: 8px 16px;
    border-radius: 8px;
    transition: all 0.2s;
    white-space: nowrap;
    font-weight: 500;
}
.nav-link:hover { color: var(--brand-blue); background: rgba(22, 101, 216, 0.07); }
.nav-menu li { position: relative; }

.dropdown {
    display: none;
    position: absolute;
    top: calc(100% + 8px); left: 0;
    min-width: 230px;
    background: #ffffff;
    border: 1px solid var(--border-bright);
    border-radius: 14px;
    box-shadow: 0 16px 48px rgba(22, 101, 216, 0.14), 0 4px 12px rgba(0,0,0,0.06);
    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-body);
    text-decoration: none; font-size: 14px;
    transition: all 0.2s;
}
.dropdown a:hover { background: rgba(22, 101, 216, 0.06); 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-body); position: relative; transition: all 0.3s; }
.hamburger::before, .hamburger::after {
    content: ''; position: absolute; width: 22px; height: 2px; background: var(--text-body); 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(0,0,0,0.4); z-index: 998; }

/* ===== 流星效果（白色背景适配版）===== */
.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: 120px;
    background: linear-gradient(180deg, rgba(22, 101, 216, 0.8), rgba(77, 142, 247, 0.4), transparent);
    border-radius: 100px;
    animation: meteorFall linear infinite;
    opacity: 0;
}
.meteor::before {
    content: ''; position: absolute; top: 0; left: 50%;
    transform: translateX(-50%);
    width: 5px; height: 5px;
    background: var(--brand-blue);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--brand-blue), 0 0 20px rgba(22, 101, 216, 0.5);
}
.meteor:nth-child(1) { left: 6%; animation-duration: 3.5s; animation-delay: 0s; }
.meteor:nth-child(2) { left: 18%; animation-duration: 4.2s; animation-delay: 1.4s; }
.meteor:nth-child(3) { left: 34%; animation-duration: 3.8s; animation-delay: 2.6s; }
.meteor:nth-child(4) { left: 50%; animation-duration: 4.8s; animation-delay: 0.8s; }
.meteor:nth-child(5) { left: 66%; animation-duration: 4.0s; animation-delay: 2.0s; }
.meteor:nth-child(6) { left: 80%; animation-duration: 4.5s; animation-delay: 3.3s; }
.meteor:nth-child(7) { left: 92%; animation-duration: 3.6s; animation-delay: 1.7s; }
@keyframes meteorFall {
    0% { top: -140px; transform: translateX(0) rotate(-42deg); opacity: 0; }
    8% { opacity: 0.9; }
    75% { opacity: 0.6; }
    100% { top: 105%; transform: translateX(-260px) rotate(-42deg); opacity: 0; }
}

/* ===== 浮动光点粒子 ===== */
.particles { position: absolute; top: 0; left: 0; right: 0; bottom: 0; pointer-events: none; z-index: 1; }
.particle {
    position: absolute; width: 4px; height: 4px;
    background: var(--brand-blue-light);
    border-radius: 50%; opacity: 0.3;
    animation: particleFloat 14s ease-in-out infinite;
    box-shadow: 0 0 8px rgba(22, 101, 216, 0.4);
}
.particle:nth-child(1) { left: 5%; top: 25%; animation-delay: 0s; }
.particle:nth-child(2) { left: 15%; top: 65%; animation-delay: 1.5s; }
.particle:nth-child(3) { left: 28%; top: 42%; animation-delay: 2.8s; }
.particle:nth-child(4) { left: 38%; top: 78%; animation-delay: 4.1s; }
.particle:nth-child(5) { left: 48%; top: 33%; animation-delay: 5.2s; }
.particle:nth-child(6) { left: 58%; top: 68%; animation-delay: 6.3s; }
.particle:nth-child(7) { left: 68%; top: 48%; animation-delay: 7.5s; }
.particle:nth-child(8) { left: 78%; top: 28%; animation-delay: 8.8s; }
.particle:nth-child(9) { left: 88%; top: 58%; animation-delay: 10.1s; }
.particle:nth-child(10) { left: 95%; top: 38%; animation-delay: 11.4s; }
@keyframes particleFloat {
    0%, 100% { transform: translateY(0) translateX(0); opacity: 0.3; }
    25% { transform: translateY(-20px) translateX(14px); opacity: 0.6; }
    50% { transform: translateY(-10px) translateX(-10px); opacity: 0.4; }
    75% { transform: translateY(-26px) translateX(8px); opacity: 0.5; }
}

/* ===== Hero 区 ===== */
.hero {
    padding: 160px 60px 120px;
    background:
        radial-gradient(ellipse at 15% 50%, rgba(22, 101, 216, 0.08) 0%, transparent 60%),
        radial-gradient(ellipse at 85% 20%, rgba(0, 180, 216, 0.06) 0%, transparent 50%),
        linear-gradient(180deg, #eef4ff 0%, #f7faff 40%, #ffffff 100%);
    position: relative; overflow: hidden;
    min-height: 620px;
    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, rgba(22, 101, 216, 0.3), 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(22, 101, 216, 0.08);
    border: 1px solid rgba(22, 101, 216, 0.2);
    border-radius: 20px;
    padding: 6px 16px; margin-bottom: 24px;
    font-size: 13px; color: var(--brand-blue);
    letter-spacing: 0.5px; font-weight: 500;
}
.hero-badge::before {
    content: '';
    width: 7px; height: 7px;
    background: #22c55e;
    border-radius: 50%;
    box-shadow: 0 0 8px rgba(34, 197, 94, 0.6);
    animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse { 0%, 100% { opacity: 1; transform: scale(1); } 50% { opacity: 0.5; transform: scale(0.75); } }

.hero-title {
    font-size: 52px; font-weight: 800; margin-bottom: 20px;
    line-height: 1.2;
    background: linear-gradient(135deg, var(--text-dark) 30%, var(--brand-blue) 100%);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-subtitle {
    font-size: 18px; color: var(--text-muted);
    margin-bottom: 48px; line-height: 1.8;
    letter-spacing: 0.3px; max-width: 620px; margin-left: auto; margin-right: auto;
}
.hero-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

.btn-primary {
    background: linear-gradient(135deg, var(--brand-blue2), var(--brand-blue-light));
    color: white; padding: 14px 36px; border-radius: 10px;
    text-decoration: none; font-size: 15px; font-weight: 600;
    transition: all 0.3s;
    box-shadow: 0 4px 20px rgba(22, 101, 216, 0.35);
    position: relative; overflow: hidden;
}
.btn-primary::before {
    content: ''; position: absolute; top: 0; left: -100%; width: 100%; height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.4s;
}
.btn-primary:hover::before { left: 100%; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 32px rgba(22, 101, 216, 0.45); }

.btn-secondary {
    background: white; color: var(--brand-blue);
    padding: 14px 36px; border-radius: 10px;
    border: 1.5px solid rgba(22, 101, 216, 0.4);
    text-decoration: none; font-size: 15px; font-weight: 600; transition: all 0.3s;
    box-shadow: var(--shadow-sm);
}
.btn-secondary:hover {
    background: rgba(22, 101, 216, 0.05);
    border-color: var(--brand-blue);
    box-shadow: var(--shadow-md);
    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 rgba(22, 101, 216, 0.12);
}
.stat-item { text-align: center; }
.stat-number {
    font-size: 40px; font-weight: 800; color: var(--brand-blue);
    line-height: 1;
}
.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-dark);
    position: relative;
}
.section-title::after {
    content: '';
    display: block; width: 48px; height: 3px;
    background: linear-gradient(90deg, var(--brand-blue2), var(--brand-blue-light));
    margin: 14px auto 0;
    border-radius: 2px;
}
.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;
    background: var(--bg-white);
}
.services-grid {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
    margin-top: 48px;
}
.service-card {
    background: var(--bg-card);
    border: 1px solid rgba(22, 101, 216, 0.1);
    border-radius: 16px; padding: 32px;
    text-decoration: none; color: var(--text-body);
    transition: all 0.35s;
    text-align: left; position: relative; overflow: hidden;
    box-shadow: var(--shadow-sm);
}
.service-card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
    background: linear-gradient(90deg, var(--brand-blue2), var(--brand-blue-light));
    opacity: 0; transition: opacity 0.3s;
}
.service-card:hover {
    border-color: rgba(22, 101, 216, 0.25);
    transform: translateY(-7px);
    box-shadow: var(--shadow-lg);
}
.service-card:hover::before { opacity: 1; }
.service-icon {
    width: 56px; height: 56px;
    background: linear-gradient(135deg, rgba(22, 101, 216, 0.1), rgba(77, 142, 247, 0.08));
    border: 1px solid rgba(22, 101, 216, 0.15);
    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-light));
    box-shadow: 0 6px 20px rgba(22, 101, 216, 0.3);
    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-dark); }
.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; font-weight: 500;
}
.service-card:hover .service-arrow { opacity: 1; transform: translateX(0); }

/* ===== 关于预览区 ===== */
.about-preview {
    background: var(--bg-section);
    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(22, 101, 216, 0.06) 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-dark); }
.about-content p { color: var(--text-body); 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: 1.5px solid rgba(22, 101, 216, 0.3); padding-bottom: 2px;
    transition: all 0.2s;
}
.btn-link:hover { color: var(--brand-blue2); border-bottom-color: var(--brand-blue2); }
.stats-grid { display: flex; flex-direction: column; gap: 20px; min-width: 220px; }
.stat-card {
    background: white; border: 1px solid var(--border);
    border-radius: 12px; padding: 20px 24px; text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s;
}
.stat-card:hover {
    box-shadow: var(--shadow-md);
    border-color: rgba(22, 101, 216, 0.2);
    transform: translateY(-2px);
}
.stat-card .stat-number { font-size: 32px; font-weight: 800; color: var(--brand-blue); }
.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: linear-gradient(135deg, #0a3aa8 0%, #1665d8 50%, #2d7de8 100%);
    color: #fff; text-align: center; position: relative; overflow: hidden;
}
.banner::before {
    content: '';
    position: absolute; top: 0; left: 0; right: 0; bottom: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
}
.banner::after {
    content: '';
    position: absolute; bottom: 0; right: 0;
    width: 400px; height: 400px;
    background: radial-gradient(circle, rgba(255,255,255,0.06) 0%, transparent 70%);
    border-radius: 50%;
    transform: translate(30%, 30%);
}
.banner h1 {
    font-size: 40px; font-weight: 800; margin-bottom: 16px;
    position: relative; z-index: 1; color: white;
}
.banner p {
    font-size: 16px; color: rgba(255,255,255,0.82); 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-section);
    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-dark);
}
.section h2::after {
    content: ''; display: block; width: 36px; height: 2px;
    background: linear-gradient(90deg, var(--brand-blue2), var(--brand-blue-light));
    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: white; border: 1px solid var(--border);
    border-radius: 14px; padding: 24px 20px;
    width: calc(20% - 14px); min-width: 170px; text-align: center;
    transition: all 0.3s; position: relative;
    box-shadow: var(--shadow-sm);
}
.flow-item:hover {
    border-color: rgba(22, 101, 216, 0.25);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}
.flow-num {
    width: 42px; height: 42px;
    background: linear-gradient(135deg, var(--brand-blue2), var(--brand-blue-light));
    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: 0 4px 14px rgba(22, 101, 216, 0.3);
}
.flow-item h4 { font-size: 15px; margin-bottom: 8px; color: var(--text-dark); font-weight: 600; }
.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; opacity: 0.6;
}
@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: white; border: 1px solid var(--border);
    border-radius: 14px; padding: 28px 22px; text-align: center;
    transition: all 0.3s; box-shadow: var(--shadow-sm);
}
.card:hover {
    border-color: rgba(22, 101, 216, 0.2);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}
.card-icon {
    width: 52px; height: 52px;
    background: linear-gradient(135deg, rgba(22, 101, 216, 0.1), rgba(77, 142, 247, 0.06));
    border: 1px solid rgba(22, 101, 216, 0.15);
    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-light));
    box-shadow: 0 6px 20px rgba(22, 101, 216, 0.25); 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-dark); 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-body); }
.content-box h3 { font-size: 17px; color: var(--text-dark); 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-dark); }
.content-box h2 { font-size: 20px !important; color: var(--text-dark) !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: white; border: 1px solid var(--border);
    border-radius: 12px; margin-bottom: 10px; overflow: hidden;
    transition: all 0.3s; box-shadow: var(--shadow-sm);
}
.faq-item:hover { border-color: rgba(22, 101, 216, 0.2); box-shadow: var(--shadow-md); }
.faq-q {
    padding: 16px 20px; cursor: pointer;
    display: flex; justify-content: space-between; align-items: center;
    font-size: 15px; color: var(--text-dark); font-weight: 500;
    transition: background 0.2s;
}
.faq-q:hover { background: rgba(22, 101, 216, 0.04); }
.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: linear-gradient(135deg, #0a3aa8 0%, #1665d8 60%, #2d7de8 100%);
    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(255, 255, 255, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
}
.cta::after {
    content: '';
    position: absolute; top: -100px; left: -100px;
    width: 350px; height: 350px;
    background: radial-gradient(circle, rgba(255,255,255,0.07) 0%, transparent 70%);
    border-radius: 50%;
}
.cta h3 { font-size: 28px; margin-bottom: 12px; font-weight: 700; position: relative; z-index: 1; color: white; }
.cta p { color: rgba(255,255,255,0.82); margin-bottom: 28px; font-size: 15px; position: relative; z-index: 1; }
.cta a {
    display: inline-block;
    background: white;
    color: var(--brand-blue); padding: 13px 36px; border-radius: 10px;
    text-decoration: none; font-weight: 700; font-size: 15px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.15);
    transition: all 0.3s; position: relative; z-index: 1;
}
.cta a:hover { transform: translateY(-2px); box-shadow: 0 8px 32px rgba(0,0,0,0.2); background: #f0f5ff; }

/* ===== 页脚 ===== */
.footer {
    padding: 32px 60px;
    background: var(--text-dark);
    border-top: 1px solid rgba(22, 101, 216, 0.15);
    color: rgba(255,255,255,0.55); text-align: center; font-size: 13px;
}
.footer a { color: rgba(255,255,255,0.55); text-decoration: none; transition: color 0.2s; }
.footer a:hover { color: rgba(255,255,255,0.9); }
.footer-links { margin-top: 8px; }
.footer-links a { margin: 0 12px; }

/* ===== 关于/联系页面 ===== */
.page-header {
    padding: 140px 60px 60px;
    background: linear-gradient(180deg, #eef4ff 0%, #f7faff 60%, #ffffff 100%);
    position: relative; overflow: hidden;
}
.page-header::after {
    content: '';
    position: absolute; bottom: 0; left: 0; right: 0; height: 1px;
    background: linear-gradient(90deg, transparent, rgba(22, 101, 216, 0.3), transparent);
}
.page-title { font-size: 38px; font-weight: 800; color: var(--text-dark); }
.page-body { max-width: 900px; margin: 0 auto; padding: 60px; }
.page-body h2 { font-size: 22px; margin: 32px 0 14px; color: var(--text-dark); font-weight: 600; }
.page-body p { color: var(--text-body); 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-body); }
.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: white; border: 1px solid var(--border);
    border-radius: 14px; padding: 28px;
    transition: all 0.3s; box-shadow: var(--shadow-sm);
}
.contact-card:hover { border-color: rgba(22, 101, 216, 0.25); box-shadow: var(--shadow-md); transform: translateY(-2px); }
.contact-card i { font-size: 24px; color: var(--brand-blue); margin-bottom: 12px; display: block; }
.contact-card h4 { font-size: 16px; color: var(--text-dark); margin-bottom: 8px; font-weight: 600; }
.contact-card p { color: var(--text-muted); font-size: 14px; }

/* ===== 关于页面核心优势卡片 ===== */
.advantages-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; margin-top: 32px; }
.advantage-card {
    background: white; border: 1px solid var(--border);
    border-radius: 14px; padding: 28px;
    transition: all 0.3s; box-shadow: var(--shadow-sm);
    display: flex; gap: 16px; align-items: flex-start;
}
.advantage-card:hover { border-color: rgba(22, 101, 216, 0.2); box-shadow: var(--shadow-md); transform: translateY(-2px); }
.advantage-icon {
    width: 48px; height: 48px; flex-shrink: 0;
    background: linear-gradient(135deg, rgba(22, 101, 216, 0.1), rgba(77, 142, 247, 0.06));
    border: 1px solid rgba(22, 101, 216, 0.15);
    border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
}
.advantage-card:hover .advantage-icon {
    background: linear-gradient(135deg, var(--brand-blue2), var(--brand-blue-light));
    border-color: transparent;
}
.advantage-icon i { color: var(--brand-blue); font-size: 18px; transition: color 0.3s; }
.advantage-card:hover .advantage-icon i { color: white; }
.advantage-text h4 { font-size: 15px; font-weight: 600; color: var(--text-dark); margin-bottom: 6px; }
.advantage-text p { font-size: 13px; color: var(--text-muted); line-height: 1.6; }

/* ===== 联系表单 ===== */
.form-card {
    background: white; border: 1px solid var(--border);
    border-radius: 16px; padding: 36px;
    box-shadow: var(--shadow-md);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-bottom: 20px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 13px; font-weight: 500; color: var(--text-body); margin-bottom: 6px; }
.form-group input,
.form-group textarea,
.form-group select {
    width: 100%; border: 1.5px solid var(--border);
    border-radius: 9px; padding: 11px 14px;
    font-size: 14px; font-family: inherit; color: var(--text-dark);
    background: #fafcff; transition: all 0.2s;
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none; border-color: var(--brand-blue);
    background: white;
    box-shadow: 0 0 0 3px rgba(22, 101, 216, 0.1);
}
.form-group textarea { min-height: 130px; resize: vertical; line-height: 1.6; }

/* ===== 行业覆盖标签 ===== */
.industry-tags { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; justify-content: center; }
.industry-tag {
    background: white; border: 1.5px solid rgba(22, 101, 216, 0.15);
    border-radius: 100px; padding: 8px 20px; font-size: 14px;
    color: var(--text-body); font-weight: 500; transition: all 0.2s;
    box-shadow: var(--shadow-sm);
}
.industry-tag:hover { background: rgba(22, 101, 216, 0.06); border-color: var(--brand-blue); color: var(--brand-blue); }

/* ===== 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: white; border-left: 1px solid var(--border);
        padding: 80px 20px 20px; z-index: 999;
        box-shadow: -4px 0 24px rgba(22, 101, 216, 0.12);
    }
    .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; }
    .advantages-grid { grid-template-columns: 1fr; }
    .footer { padding: 24px 20px; }
    .cta { padding: 60px 24px; }
    .form-row { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
    .hero-title { font-size: 28px; }
    .grid4 { grid-template-columns: 1fr; }
    .stats-grid { flex-direction: column; }
}