/* ========== 全局变量 ========== */
:root {
    --primary: #2563eb;
    --primary-dark: #1e40af;
    --primary-light: #3b82f6;
    --accent: #f59e0b;
    --accent-dark: #d97706;
    --accent-light: #fbbf24;
    --dark: #0f172a;
    --dark-2: #1e293b;
    --gray: #64748b;
    --gray-light: #f1f5f9;
    --gray-lighter: #f8fafc;
    --white: #ffffff;
    --success: #10b981;
    --text: #334155;
    --text-light: #64748b;
    --gradient: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
    --gradient-accent: linear-gradient(135deg, #f59e0b 0%, #ef4444 100%);
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1);
    --radius: 12px;
    --radius-lg: 20px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ========== Reset ========== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    color: var(--text);
    line-height: 1.7;
    background: var(--white);
    overflow-x: hidden;
}
a { text-decoration: none; color: inherit; transition: var(--transition); }
ul { list-style: none; }
img { max-width: 100%; display: block; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

/* ========== Container ========== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ========== 按钮 ========== */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    padding: 14px 32px; border-radius: 50px; font-size: 15px; font-weight: 600;
    transition: var(--transition); white-space: nowrap;
}
.btn-primary { background: var(--gradient); color: var(--white); box-shadow: 0 4px 14px rgba(37,99,235,0.35); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 25px rgba(37,99,235,0.45); }
.btn-accent { background: var(--gradient-accent); color: var(--white); box-shadow: 0 4px 14px rgba(245,158,11,0.35); }
.btn-accent:hover { transform: translateY(-2px); box-shadow: 0 8px 25px rgba(245,158,11,0.45); }
.btn-outline { background: transparent; color: var(--white); border: 2px solid rgba(255,255,255,0.5); }
.btn-outline:hover { background: var(--white); color: var(--primary); border-color: var(--white); }
.btn-light { background: var(--white); color: var(--primary); box-shadow: var(--shadow); }
.btn-light:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.btn-lg { padding: 18px 40px; font-size: 16px; }

/* ========== 导航栏 ========== */
.navbar {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    background: rgba(255,255,255,0.85); backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(0,0,0,0.06);
    transition: var(--transition);
}
.navbar.scrolled { background: rgba(255,255,255,0.98); box-shadow: var(--shadow); }
.nav-container { display: flex; align-items: center; justify-content: space-between; height: 70px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 22px; color: var(--dark); }
.logo-icon {
    width: 40px; height: 40px; border-radius: 10px; display: flex; align-items: center; justify-content: center;
    background: var(--gradient); color: var(--white); font-size: 20px;
}
.logo-text { background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.logo-light .logo-text { background: var(--white); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.logo-light { color: var(--white); }
.nav-menu { display: flex; gap: 36px; }
.nav-menu a { font-weight: 500; color: var(--text); position: relative; padding: 4px 0; }
.nav-menu a::after { content: ''; position: absolute; bottom: 0; left: 50%; transform: translateX(-50%); width: 0; height: 2px; background: var(--gradient); transition: var(--transition); }
.nav-menu a:hover::after, .nav-menu a.active::after { width: 100%; }
.nav-menu a:hover, .nav-menu a.active { color: var(--primary); }
.nav-cta { padding: 10px 24px; font-size: 14px; }
.nav-toggle { display: none; flex-direction: column; gap: 5px; padding: 8px; }
.nav-toggle span { width: 24px; height: 2px; background: var(--dark); border-radius: 2px; transition: var(--transition); }
.nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ========== 通用 Section ========== */
.section { padding: 100px 0; }
.section-gray { background: var(--gray-lighter); }
.section-dark { background: var(--dark); color: var(--white); }
.section-header { text-align: center; max-width: 700px; margin: 0 auto 64px; }
.section-tag { display: inline-block; padding: 6px 18px; border-radius: 50px; font-size: 13px; font-weight: 600; background: rgba(37,99,235,0.1); color: var(--primary); margin-bottom: 16px; }
.section-tag.accent { background: rgba(245,158,11,0.1); color: var(--accent-dark); }
.section-title { font-size: 38px; font-weight: 800; color: var(--dark); line-height: 1.3; }
.section-subtitle { font-size: 17px; color: var(--text-light); margin-top: 16px; }
.section-title.text-light { color: var(--white); }
.section-subtitle.text-light { color: rgba(255,255,255,0.7); }

/* ========== Hero 首页 ========== */
.hero {
    position: relative; min-height: 100vh; display: flex; align-items: center;
    background: var(--dark); overflow: hidden;
}
.hero::before {
    content: ''; position: absolute; inset: 0;
    background:
        radial-gradient(circle at 20% 30%, rgba(37,99,235,0.4) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(245,158,11,0.3) 0%, transparent 50%),
        radial-gradient(circle at 50% 100%, rgba(124,58,237,0.3) 0%, transparent 50%);
}
.hero-bg { position: absolute; inset: 0; opacity: 0.1;
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' xmlns='http://www.w3.org/2000/svg'%3E%3Cdefs%3E%3Cpattern id='g' width='60' height='60' patternUnits='userSpaceOnUse'%3E%3Cpath d='M60 0L0 0 0 60' fill='none' stroke='%23ffffff' stroke-width='0.5'/%3E%3C/pattern%3E%3C/defs%3E%3Crect width='100%25' height='100%25' fill='url(%23g)'/%3E%3C/svg%3E");
}
.hero-content { position: relative; z-index: 2; padding-top: 70px; }
.hero-badge { display: inline-flex; align-items: center; gap: 8px; padding: 8px 20px; border-radius: 50px; background: rgba(255,255,255,0.1); border: 1px solid rgba(255,255,255,0.15); color: rgba(255,255,255,0.9); font-size: 14px; margin-bottom: 28px; backdrop-filter: blur(8px); }
.hero-badge i { color: var(--accent-light); }
.hero h1 { font-size: 64px; font-weight: 800; color: var(--white); line-height: 1.15; letter-spacing: -1px; }
.hero h1 .highlight { background: var(--gradient-accent); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero h1 .highlight-2 { background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-desc { font-size: 19px; color: rgba(255,255,255,0.7); max-width: 580px; margin-top: 24px; line-height: 1.8; }
.hero-actions { display: flex; gap: 16px; margin-top: 40px; flex-wrap: wrap; }

/* 浮动卡片装饰 */
.hero-cards { position: relative; z-index: 2; display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.hero-card {
    background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.1); border-radius: var(--radius);
    padding: 24px; backdrop-filter: blur(12px); transition: var(--transition);
}
.hero-card:hover { background: rgba(255,255,255,0.12); transform: translateY(-4px); }
.hero-card-icon { width: 48px; height: 48px; border-radius: 12px; display: flex; align-items: center; justify-content: center; font-size: 24px; margin-bottom: 16px; }
.hero-card-icon.blue { background: rgba(37,99,235,0.2); color: #60a5fa; }
.hero-card-icon.orange { background: rgba(245,158,11,0.2); color: var(--accent-light); }
.hero-card-icon.green { background: rgba(16,185,129,0.2); color: #34d399; }
.hero-card-icon.purple { background: rgba(124,58,237,0.2); color: #a78bfa; }
.hero-card h4 { color: var(--white); font-size: 17px; margin-bottom: 8px; }
.hero-card p { color: rgba(255,255,255,0.6); font-size: 14px; }
.hero-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 60px; align-items: center; }

/* 滚动指示 */
.scroll-down { position: absolute; bottom: 30px; left: 50%; transform: translateX(-50%); z-index: 3; color: rgba(255,255,255,0.5); font-size: 24px; animation: bounce 2s infinite; }
@keyframes bounce { 0%,100% { transform: translateX(-50%) translateY(0); } 50% { transform: translateX(-50%) translateY(10px); } }

/* ========== 数据统计 ========== */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px; }
.stat-item { text-align: center; }
.stat-num { font-size: 52px; font-weight: 800; background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; line-height: 1; }
.stat-label { font-size: 15px; color: var(--text-light); margin-top: 12px; }
.stat-suffix { font-size: 28px; font-weight: 800; background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }

/* ========== 服务卡片 ========== */
.services-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 28px; }
.service-card {
    background: var(--white); border-radius: var(--radius-lg); padding: 36px 30px;
    border: 1px solid #e2e8f0; transition: var(--transition); position: relative; overflow: hidden;
}
.service-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px; background: var(--gradient); transform: scaleX(0); transform-origin: left; transition: var(--transition); }
.service-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-xl); border-color: transparent; }
.service-card:hover::before { transform: scaleX(1); }
.service-icon { width: 64px; height: 64px; border-radius: 16px; display: flex; align-items: center; justify-content: center; font-size: 30px; margin-bottom: 24px; }
.service-icon.blue { background: linear-gradient(135deg, #dbeafe, #bfdbfe); color: var(--primary); }
.service-icon.orange { background: linear-gradient(135deg, #fef3c7, #fde68a); color: var(--accent-dark); }
.service-icon.green { background: linear-gradient(135deg, #d1fae5, #a7f3d0); color: var(--success); }
.service-icon.purple { background: linear-gradient(135deg, #ede9fe, #ddd6fe); color: #7c3aed; }
.service-icon.red { background: linear-gradient(135deg, #fee2e2, #fecaca); color: #ef4444; }
.service-icon.cyan { background: linear-gradient(135deg, #cffafe, #a5f3fc); color: #06b6d4; }
.service-card h3 { font-size: 20px; font-weight: 700; color: var(--dark); margin-bottom: 12px; }
.service-card p { font-size: 15px; color: var(--text-light); line-height: 1.8; }
.service-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }
.service-tag { font-size: 12px; padding: 4px 12px; border-radius: 50px; background: var(--gray-light); color: var(--gray); font-weight: 500; }

/* ========== 特性区域 ========== */
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 24px; }
.feature-item { display: flex; gap: 20px; padding: 28px; border-radius: var(--radius); background: var(--white); border: 1px solid #e2e8f0; transition: var(--transition); }
.feature-item:hover { box-shadow: var(--shadow-lg); transform: translateX(4px); }
.feature-icon { flex-shrink: 0; width: 52px; height: 52px; border-radius: 12px; display: flex; align-items: center; justify-content: center; font-size: 24px; background: var(--gradient); color: var(--white); }
.feature-item h4 { font-size: 18px; font-weight: 700; color: var(--dark); margin-bottom: 8px; }
.feature-item p { font-size: 14px; color: var(--text-light); }

/* ========== CTA Section ========== */
.cta-section { position: relative; padding: 80px 0; background: var(--gradient); text-align: center; overflow: hidden; }
.cta-section::before { content: ''; position: absolute; inset: 0; background: radial-gradient(circle at 30% 50%, rgba(245,158,11,0.3), transparent 50%); }
.cta-content { position: relative; z-index: 1; }
.cta-section h2 { font-size: 36px; font-weight: 800; color: var(--white); }
.cta-section p { font-size: 18px; color: rgba(255,255,255,0.8); margin-top: 16px; }
.cta-section .btn { margin-top: 32px; }

/* ========== 关于我们页面 ========== */
.page-hero {
    padding: 140px 0 80px; background: var(--dark); color: var(--white);
    position: relative; overflow: hidden;
}
.page-hero::before { content: ''; position: absolute; inset: 0;
    background: radial-gradient(circle at 20% 50%, rgba(37,99,235,0.3), transparent 50%),
                radial-gradient(circle at 80% 50%, rgba(245,158,11,0.2), transparent 50%);
}
.page-hero-content { position: relative; z-index: 1; }
.page-hero h1 { font-size: 44px; font-weight: 800; }
.page-hero p { font-size: 18px; color: rgba(255,255,255,0.7); margin-top: 16px; }
.breadcrumb { display: flex; gap: 8px; align-items: center; font-size: 14px; color: rgba(255,255,255,0.5); margin-bottom: 20px; }
.breadcrumb a { color: rgba(255,255,255,0.7); }
.breadcrumb a:hover { color: var(--white); }

/* 公司简介 */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.about-text h2 { font-size: 32px; font-weight: 800; color: var(--dark); margin-bottom: 20px; }
.about-text p { font-size: 16px; color: var(--text-light); line-height: 2; margin-bottom: 16px; }
.about-features { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 28px; }
.about-feature { display: flex; align-items: center; gap: 10px; font-size: 15px; font-weight: 500; color: var(--dark); }
.about-feature i { color: var(--primary); font-size: 18px; }
.about-visual { position: relative; }
.about-image { border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-xl); aspect-ratio: 4/3; background: var(--gradient); display: flex; align-items: center; justify-content: center; }
.about-image i { font-size: 120px; color: rgba(255,255,255,0.3); }
.about-badge { position: absolute; bottom: -24px; right: -24px; background: var(--white); border-radius: var(--radius); padding: 24px 32px; box-shadow: var(--shadow-xl); text-align: center; }
.about-badge-num { font-size: 36px; font-weight: 800; background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.about-badge-label { font-size: 13px; color: var(--text-light); }

/* 时间线 */
.timeline { position: relative; max-width: 800px; margin: 0 auto; }
.timeline::before { content: ''; position: absolute; left: 50%; top: 0; bottom: 0; width: 2px; background: linear-gradient(180deg, var(--primary), var(--accent)); transform: translateX(-50%); }
.timeline-item { position: relative; width: 50%; padding: 0 40px 50px; }
.timeline-item:nth-child(odd) { left: 0; text-align: right; }
.timeline-item:nth-child(even) { left: 50%; }
.timeline-dot { position: absolute; top: 4px; width: 16px; height: 16px; border-radius: 50%; background: var(--white); border: 4px solid var(--primary); z-index: 1; }
.timeline-item:nth-child(odd) .timeline-dot { right: -8px; }
.timeline-item:nth-child(even) .timeline-dot { left: -8px; }
.timeline-content { background: var(--white); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); border: 1px solid #e2e8f0; transition: var(--transition); }
.timeline-content:hover { box-shadow: var(--shadow-lg); transform: scale(1.02); }
.timeline-year { font-size: 14px; font-weight: 700; color: var(--primary); margin-bottom: 8px; }
.timeline-content h4 { font-size: 17px; font-weight: 700; color: var(--dark); margin-bottom: 8px; }
.timeline-content p { font-size: 14px; color: var(--text-light); }

/* 价值观卡片 */
.values-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 28px; }
.value-card { text-align: center; padding: 40px 28px; border-radius: var(--radius-lg); background: var(--white); border: 1px solid #e2e8f0; transition: var(--transition); }
.value-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-xl); }
.value-icon { width: 72px; height: 72px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 32px; margin: 0 auto 24px; }
.value-card h4 { font-size: 20px; font-weight: 700; color: var(--dark); margin-bottom: 12px; }
.value-card p { font-size: 15px; color: var(--text-light); line-height: 1.8; }

/* 团队 */
.team-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 28px; }
.team-card { text-align: center; background: var(--white); border-radius: var(--radius-lg); overflow: hidden; border: 1px solid #e2e8f0; transition: var(--transition); }
.team-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-xl); }
.team-avatar { width: 100%; aspect-ratio: 1; background: var(--gradient); display: flex; align-items: center; justify-content: center; font-size: 60px; color: rgba(255,255,255,0.4); }
.team-info { padding: 24px; }
.team-info h4 { font-size: 18px; font-weight: 700; color: var(--dark); }
.team-role { font-size: 14px; color: var(--primary); font-weight: 500; margin-top: 4px; }
.team-info p { font-size: 13px; color: var(--text-light); margin-top: 8px; }

/* ========== 业务范围页面 ========== */
.service-detail { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; margin-bottom: 80px; }
.service-detail:nth-child(even) .service-detail-text { order: 2; }
.service-detail:nth-child(even) .service-detail-visual { order: 1; }
.service-detail-text h2 { font-size: 30px; font-weight: 800; color: var(--dark); margin-bottom: 20px; }
.service-detail-text p { font-size: 16px; color: var(--text-light); line-height: 2; margin-bottom: 20px; }
.service-detail-list { display: grid; gap: 14px; margin-top: 24px; }
.service-detail-list li { display: flex; gap: 12px; align-items: flex-start; font-size: 15px; color: var(--text); }
.service-detail-list i { color: var(--success); font-size: 18px; flex-shrink: 0; margin-top: 3px; }
.service-detail-visual { border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-xl); aspect-ratio: 16/11; display: flex; align-items: center; justify-content: center; }
.service-detail-visual i { font-size: 100px; color: rgba(255,255,255,0.3); }

/* 技术栈 */
.tech-stack { display: flex; flex-wrap: wrap; gap: 16px; justify-content: center; }
.tech-item { display: flex; align-items: center; gap: 10px; padding: 12px 24px; border-radius: 50px; background: var(--white); border: 1px solid #e2e8f0; font-weight: 600; color: var(--dark); transition: var(--transition); }
.tech-item:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--primary); }
.tech-item i { font-size: 22px; }

/* 开发流程 */
.process-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 24px; }
.process-step { text-align: center; position: relative; padding: 32px 20px; }
.process-num { width: 56px; height: 56px; border-radius: 50%; background: var(--gradient); color: var(--white); display: flex; align-items: center; justify-content: center; font-size: 22px; font-weight: 800; margin: 0 auto 20px; }
.process-step h4 { font-size: 17px; font-weight: 700; color: var(--dark); margin-bottom: 10px; }
.process-step p { font-size: 14px; color: var(--text-light); }

/* ========== 案例展示页面 ========== */
.cases-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(350px, 1fr)); gap: 32px; }
.case-card { border-radius: var(--radius-lg); overflow: hidden; background: var(--white); border: 1px solid #e2e8f0; transition: var(--transition); }
.case-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-xl); }
.case-image { width: 100%; aspect-ratio: 16/10; display: flex; align-items: center; justify-content: center; font-size: 64px; color: rgba(255,255,255,0.4); position: relative; overflow: hidden; }
.case-image .case-tag { position: absolute; top: 16px; left: 16px; padding: 6px 16px; border-radius: 50px; background: rgba(255,255,255,0.9); font-size: 12px; font-weight: 600; color: var(--dark); backdrop-filter: blur(8px); }
.case-info { padding: 28px; }
.case-info h3 { font-size: 20px; font-weight: 700; color: var(--dark); margin-bottom: 10px; }
.case-info p { font-size: 14px; color: var(--text-light); line-height: 1.8; }
.case-tech { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.case-tech span { font-size: 12px; padding: 4px 12px; border-radius: 50px; background: var(--gray-light); color: var(--gray); }

/* ========== 联系我们页面 ========== */
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 48px; }
.contact-info-card { background: var(--dark); border-radius: var(--radius-lg); padding: 48px 40px; color: var(--white); position: relative; overflow: hidden; }
.contact-info-card::before { content: ''; position: absolute; top: -50px; right: -50px; width: 200px; height: 200px; border-radius: 50%; background: rgba(37,99,235,0.2); }
.contact-info-card::after { content: ''; position: absolute; bottom: -80px; left: -80px; width: 250px; height: 250px; border-radius: 50%; background: rgba(245,158,11,0.15); }
.contact-info-card > * { position: relative; z-index: 1; }
.contact-info-card h3 { font-size: 24px; font-weight: 700; margin-bottom: 16px; }
.contact-info-card > p { color: rgba(255,255,255,0.7); font-size: 15px; margin-bottom: 32px; }
.contact-list { display: grid; gap: 24px; }
.contact-list-item { display: flex; gap: 16px; align-items: flex-start; }
.contact-list-item .icon { width: 48px; height: 48px; border-radius: 12px; background: rgba(255,255,255,0.1); display: flex; align-items: center; justify-content: center; font-size: 22px; color: var(--accent-light); flex-shrink: 0; }
.contact-list-item .label { font-size: 13px; color: rgba(255,255,255,0.5); }
.contact-list-item .value { font-size: 16px; color: var(--white); font-weight: 500; margin-top: 2px; }

.contact-form-wrap { background: var(--white); border-radius: var(--radius-lg); padding: 48px 40px; border: 1px solid #e2e8f0; }
.contact-form-wrap h3 { font-size: 24px; font-weight: 700; color: var(--dark); margin-bottom: 8px; }
.contact-form-wrap > p { color: var(--text-light); margin-bottom: 32px; }
.form-group { margin-bottom: 20px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.form-label { display: block; font-size: 14px; font-weight: 600; color: var(--dark); margin-bottom: 8px; }
.form-input, .form-select, .form-textarea {
    width: 100%; padding: 14px 18px; border: 2px solid #e2e8f0; border-radius: var(--radius);
    font-size: 15px; font-family: inherit; transition: var(--transition); background: var(--gray-lighter);
}
.form-input:focus, .form-select:focus, .form-textarea:focus { outline: none; border-color: var(--primary); background: var(--white); box-shadow: 0 0 0 4px rgba(37,99,235,0.1); }
.form-textarea { resize: vertical; min-height: 120px; }
.form-success { background: rgba(16,185,129,0.1); border: 2px solid var(--success); border-radius: var(--radius); padding: 16px 20px; color: var(--success); font-weight: 600; display: none; }
.form-success.show { display: block; }

/* 地图 */
.map-section { border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow); }
.map-section iframe { width: 100%; height: 400px; border: 0; display: block; }

/* ========== 页脚 ========== */
.footer { background: var(--dark); color: rgba(255,255,255,0.6); padding: 80px 0 0; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr; gap: 48px; padding-bottom: 56px; border-bottom: 1px solid rgba(255,255,255,0.08); }
.footer-brand p { font-size: 14px; line-height: 1.8; margin-top: 20px; max-width: 300px; }
.social-links { display: flex; gap: 12px; margin-top: 24px; }
.social-links a { width: 40px; height: 40px; border-radius: 10px; background: rgba(255,255,255,0.08); display: flex; align-items: center; justify-content: center; font-size: 18px; color: rgba(255,255,255,0.6); }
.social-links a:hover { background: var(--gradient); color: var(--white); transform: translateY(-3px); }
.footer-col h4 { font-size: 16px; font-weight: 700; color: var(--white); margin-bottom: 24px; }
.footer-col ul { display: grid; gap: 12px; }
.footer-col ul a { font-size: 14px; color: rgba(255,255,255,0.6); }
.footer-col ul a:hover { color: var(--white); padding-left: 4px; }
.contact-info li { display: flex; gap: 10px; font-size: 14px; align-items: flex-start; }
.contact-info i { color: var(--accent-light); margin-top: 3px; flex-shrink: 0; }
.footer-bottom { padding: 28px 0; text-align: center; font-size: 13px; }
.footer-bottom a { color: rgba(255,255,255,0.4); }
.footer-bottom a:hover { color: var(--white); }

/* ========== 滚动动画 ========== */
.fade-up { opacity: 0; transform: translateY(40px); transition: opacity 0.8s ease, transform 0.8s ease; }
.fade-up.visible { opacity: 1; transform: translateY(0); }
.fade-up:nth-child(2) { transition-delay: 0.1s; }
.fade-up:nth-child(3) { transition-delay: 0.2s; }
.fade-up:nth-child(4) { transition-delay: 0.3s; }

/* ========== 回到顶部 ========== */
.back-top { position: fixed; bottom: 30px; right: 30px; width: 48px; height: 48px; border-radius: 12px; background: var(--gradient); color: var(--white); display: flex; align-items: center; justify-content: center; font-size: 22px; box-shadow: var(--shadow-lg); opacity: 0; visibility: hidden; transition: var(--transition); z-index: 999; }
.back-top.show { opacity: 1; visibility: visible; }
.back-top:hover { transform: translateY(-4px); }

/* ========== 响应式 ========== */
@media (max-width: 992px) {
    .hero h1 { font-size: 48px; }
    .hero-grid { grid-template-columns: 1fr; gap: 40px; }
    .about-grid, .service-detail, .contact-grid { grid-template-columns: 1fr; gap: 40px; }
    .service-detail:nth-child(even) .service-detail-text { order: 1; }
    .service-detail:nth-child(even) .service-detail-visual { order: 2; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .stats { grid-template-columns: repeat(2, 1fr); gap: 40px; }
    .section-title { font-size: 32px; }
    .timeline::before { left: 20px; }
    .timeline-item { width: 100%; padding-left: 50px; padding-right: 0; text-align: left !important; }
    .timeline-item:nth-child(odd) { text-align: left; }
    .timeline-item .timeline-dot { left: 12px !important; right: auto !important; }
}
@media (max-width: 768px) {
    .nav-menu { display: none; position: fixed; top: 70px; left: 0; right: 0; flex-direction: column; background: var(--white); padding: 24px; gap: 0; box-shadow: var(--shadow-lg); border-top: 1px solid #e2e8f0; }
    .nav-menu.open { display: flex; }
    .nav-menu li { width: 100%; }
    .nav-menu a { display: block; padding: 14px 0; border-bottom: 1px solid #f1f5f9; }
    .nav-cta { display: none; }
    .nav-toggle { display: flex; }
    .hero h1 { font-size: 36px; }
    .hero-desc { font-size: 16px; }
    .hero-cards { grid-template-columns: 1fr; }
    .section { padding: 64px 0; }
    .section-title { font-size: 26px; }
    .page-hero h1 { font-size: 32px; }
    .stats { grid-template-columns: 1fr 1fr; }
    .form-row { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; gap: 32px; }
    .about-features { grid-template-columns: 1fr; }
    .contact-info-card, .contact-form-wrap { padding: 32px 24px; }
    .about-badge { display: none; }
}