/* ===== 基础变量与重置 ===== */
:root {
    --primary: #2563EB;
    --primary-dark: #1D4ED8;
    --primary-light: #DBEAFE;
    --secondary: #64748B;
    --success: #10B981;
    --warning: #F59E0B;
    --danger: #EF4444;
    --bg: #FFFFFF;
    --bg-light: #F8FAFC;
    --bg-dark: #0F172A;
    --text: #1E293B;
    --text-light: #64748B;
    --border: #E2E8F0;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --radius: 8px;
    --radius-lg: 16px;
    --transition: all 0.3s ease;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif; line-height: 1.7; color: var(--text); background: var(--bg); }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; height: auto; }

/* ===== 容器与布局 ===== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section { padding: 80px 0; }
.section:nth-child(even) { background: var(--bg-light); }

.section-header { text-align: center; margin-bottom: 48px; }
.section-title { font-size: 36px; font-weight: 700; color: var(--text); margin-bottom: 12px; }
.section-desc { font-size: 18px; color: var(--text-light); }

/* ===== 按钮样式 ===== */
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 12px 24px; font-size: 16px; font-weight: 500; border-radius: var(--radius); border: none; cursor: pointer; transition: var(--transition); }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-outline { background: transparent; color: var(--primary); border: 2px solid var(--primary); }
.btn-outline:hover { background: var(--primary); color: #fff; }
.btn-large { padding: 16px 32px; font-size: 18px; }
.btn-block { width: 100%; }

/* ===== 头部导航 ===== */
.header { position: fixed; top: 0; left: 0; right: 0; background: rgba(255, 255, 255, 0.95); backdrop-filter: blur(10px); z-index: 1000; box-shadow: 0 1px 3px rgba(0,0,0,0.1); }
.header-content { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.logo { display: flex; align-items: center; gap: 12px; }
.logo-icon svg { width: 40px; height: 40px; }
.logo-text { display: flex; flex-direction: column; }
.logo-name { font-size: 20px; font-weight: 700; color: var(--text); }
.logo-tagline { font-size: 12px; color: var(--text-light); }
.nav { display: flex; gap: 32px; }
.nav-link { font-size: 15px; color: var(--text); font-weight: 500; transition: var(--transition); }
.nav-link:hover { color: var(--primary); }
.header-contact { display: flex; align-items: center; gap: 20px; }
.hotline { font-size: 14px; color: var(--text-light); }

/* 移动端菜单按钮 */
.mobile-menu-btn { display: none; flex-direction: column; gap: 5px; padding: 8px; background: none; border: none; cursor: pointer; }
.mobile-menu-btn span { width: 24px; height: 2px; background: var(--text); border-radius: 2px; transition: var(--transition); }

/* 移动端菜单 */
.mobile-menu { display: none; position: fixed; top: 72px; left: 0; right: 0; background: var(--bg); padding: 24px; box-shadow: var(--shadow-lg); z-index: 999; }
.mobile-nav { display: flex; flex-direction: column; gap: 16px; }
.mobile-nav-link { font-size: 16px; padding: 12px 0; border-bottom: 1px solid var(--border); }
.mobile-contact { margin-top: 20px; padding-top: 20px; border-top: 1px solid var(--border); color: var(--text-light); text-align: center; }

/* ===== 英雄横幅 ===== */
.hero { padding: 140px 0 80px; background: linear-gradient(135deg, #EFF6FF 0%, #F5F3FF 50%, #FDF2F8 100%); min-height: 100vh; display: flex; align-items: center; }
.hero .container { display: flex; align-items: center; justify-content: space-between; gap: 60px; }
.hero-content { flex: 1; max-width: 600px; }
.hero-title { font-size: 48px; font-weight: 800; line-height: 1.2; margin-bottom: 24px; }
.highlight { background: linear-gradient(135deg, var(--primary), #8B5CF6); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-desc { font-size: 18px; color: var(--text-light); margin-bottom: 32px; line-height: 1.8; }
.highlight-text { color: var(--primary); font-weight: 600; }
.hero-buttons { display: flex; gap: 16px; margin-bottom: 48px; }
.hero-stats { display: flex; gap: 48px; }
.stat-item { text-align: center; }
.stat-number { display: block; font-size: 32px; font-weight: 700; color: var(--primary); }
.stat-label { font-size: 14px; color: var(--text-light); }

/* 英雄视觉区域 - 服务卡片堆叠 */
.hero-visual { flex: 0 0 360px; }
.service-card-stack { position: relative; width: 320px; height: 320px; }
.service-card { position: absolute; display: flex; align-items: center; gap: 8px; padding: 16px 24px; background: var(--bg); border-radius: 50px; box-shadow: var(--shadow-lg); font-weight: 600; transition: var(--transition); }
.service-card:hover { transform: scale(1.05); }
.card-icon { font-size: 24px; }
.card-text { font-size: 16px; color: var(--text); }
.card-1 { top: 0; left: 0; animation: float 3s ease-in-out infinite; }
.card-2 { top: 60px; right: 0; animation: float 3s ease-in-out 0.3s infinite; }
.card-3 { top: 120px; left: 0; animation: float 3s ease-in-out 0.6s infinite; }
.card-4 { top: 180px; right: 0; animation: float 3s ease-in-out 0.9s infinite; }
.card-5 { bottom: 0; left: 50%; transform: translateX(-50%); animation: float 3s ease-in-out 1.2s infinite; }
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }
.card-5 { animation: floatCenter 3s ease-in-out 1.2s infinite; }
@keyframes floatCenter { 0%, 100% { transform: translateX(-50%) translateY(0); } 50% { transform: translateX(-50%) translateY(-10px); } }

/* ===== 服务项目 ===== */
.services-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.service-item { background: var(--bg); border-radius: var(--radius-lg); padding: 32px; box-shadow: var(--shadow); transition: var(--transition); border: 1px solid var(--border); }
.service-item:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--primary-light); }
.service-icon { margin-bottom: 20px; }
.service-icon svg { width: 48px; height: 48px; }
.service-title { font-size: 20px; font-weight: 600; margin-bottom: 12px; }
.service-desc { font-size: 14px; color: var(--text-light); margin-bottom: 16px; line-height: 1.8; }
.service-list { margin-bottom: 20px; }
.service-list li { font-size: 14px; color: var(--text-light); padding: 6px 0; padding-left: 20px; position: relative; }
.service-list li::before { content: '✓'; position: absolute; left: 0; color: var(--success); font-weight: bold; }
.service-price { font-size: 18px; font-weight: 600; color: var(--primary); }

/* ===== 成功案例 ===== */
.case-study { background: linear-gradient(135deg, #EFF6FF, #F5F3FF); border-radius: var(--radius-lg); padding: 48px; margin-bottom: 48px; position: relative; overflow: hidden; }
.case-badge { display: inline-block; background: var(--primary); color: #fff; padding: 6px 16px; border-radius: 20px; font-size: 12px; font-weight: 600; margin-bottom: 16px; }
.case-name { font-size: 32px; font-weight: 700; margin-bottom: 8px; }
.case-company { font-size: 16px; color: var(--text-light); margin-bottom: 32px; }

.case-matrix { margin-bottom: 32px; }
.matrix-title { font-size: 18px; font-weight: 600; margin-bottom: 20px; text-align: center; }
.matrix-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 16px; }
.matrix-item { background: var(--bg); border-radius: var(--radius); padding: 20px; text-align: center; box-shadow: var(--shadow); }
.matrix-icon { font-size: 32px; margin-bottom: 12px; }
.matrix-label { font-size: 12px; color: var(--text-light); margin-bottom: 4px; }
.matrix-value { font-size: 14px; font-weight: 600; margin-bottom: 8px; }
.matrix-status { display: inline-flex; align-items: center; gap: 4px; font-size: 12px; padding: 4px 12px; border-radius: 12px; }
.matrix-status.completed { background: #D1FAE5; color: #059669; }
.matrix-status svg { width: 14px; height: 14px; }

.case-testimonial { background: var(--bg); border-radius: var(--radius); padding: 24px; }
.testimonial-text { font-size: 16px; color: var(--text); font-style: italic; margin-bottom: 12px; }
.testimonial-author { font-size: 14px; color: var(--text-light); font-weight: 500; }

.more-cases { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.case-card { background: var(--bg); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); transition: var(--transition); }
.case-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.case-card-icon { font-size: 32px; margin-bottom: 12px; }
.case-card h4 { font-size: 16px; font-weight: 600; margin-bottom: 8px; }
.case-card p { font-size: 13px; color: var(--text-light); margin-bottom: 12px; }
.case-card-tag { display: inline-block; background: var(--primary-light); color: var(--primary); padding: 4px 12px; border-radius: 12px; font-size: 12px; }

/* ===== 服务流程 ===== */
.process-timeline { display: flex; justify-content: space-between; position: relative; }
.process-timeline::before { content: ''; position: absolute; top: 40px; left: 60px; right: 60px; height: 2px; background: var(--border); }
.process-step { flex: 1; text-align: center; position: relative; padding: 0 20px; }
.step-number { width: 80px; height: 80px; background: var(--primary); color: #fff; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 24px; font-weight: 700; margin: 0 auto 24px; position: relative; z-index: 1; }
.step-content h4 { font-size: 18px; font-weight: 600; margin-bottom: 8px; }
.step-content p { font-size: 14px; color: var(--text-light); }

/* ===== 为什么选择我们 ===== */
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.feature-item { text-align: center; padding: 32px; background: var(--bg); border-radius: var(--radius-lg); box-shadow: var(--shadow); }
.feature-icon { margin-bottom: 20px; }
.feature-icon svg { width: 48px; height: 48px; }
.feature-item h4 { font-size: 18px; font-weight: 600; margin-bottom: 8px; }
.feature-item p { font-size: 14px; color: var(--text-light); }

/* ===== 联系我们 ===== */
.contact-wrapper { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; }
.contact-info h2 { font-size: 32px; font-weight: 700; margin-bottom: 12px; }
.contact-info > p { font-size: 16px; color: var(--text-light); margin-bottom: 32px; }
.contact-list { display: flex; flex-direction: column; gap: 24px; }
.contact-item { display: flex; align-items: center; gap: 16px; }
.contact-icon { width: 48px; height: 48px; background: var(--primary-light); border-radius: var(--radius); display: flex; align-items: center; justify-content: center; font-size: 20px; }
.contact-detail { display: flex; flex-direction: column; }
.contact-label { font-size: 12px; color: var(--text-light); }
.contact-value { font-size: 16px; font-weight: 500; }

.contact-form { background: var(--bg); border-radius: var(--radius-lg); padding: 40px; box-shadow: var(--shadow-lg); }
.contact-form h3 { font-size: 24px; font-weight: 600; margin-bottom: 24px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 14px; font-weight: 500; margin-bottom: 8px; }
.form-group input, .form-group select, .form-group textarea { width: 100%; padding: 14px 16px; border: 1px solid var(--border); border-radius: var(--radius); font-size: 15px; transition: var(--transition); background: var(--bg); }
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1); }
.form-group textarea { resize: vertical; min-height: 100px; }

/* ===== 页脚 ===== */
.footer { background: var(--bg-dark); color: #fff; padding: 60px 0 0; }
.footer-content { display: grid; grid-template-columns: 2fr 3fr; gap: 60px; padding-bottom: 40px; border-bottom: 1px solid rgba(255,255,255,0.1); }
.footer-logo { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
.footer-logo svg { width: 40px; height: 40px; }
.footer-logo span { font-size: 20px; font-weight: 700; }
.footer-brand p { color: rgba(255,255,255,0.7); font-size: 14px; line-height: 1.8; }
.footer-links { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; }
.footer-column h4 { font-size: 16px; font-weight: 600; margin-bottom: 16px; }
.footer-column ul li { margin-bottom: 10px; }
.footer-column ul li a { color: rgba(255,255,255,0.7); font-size: 14px; transition: var(--transition); }
.footer-column ul li a:hover { color: #fff; }
.footer-bottom { padding: 20px 0; text-align: center; font-size: 13px; color: rgba(255,255,255,0.5); }

/* ===== 弹窗 ===== */
.modal { display: none; position: fixed; top: 0; left: 0; right: 0; bottom: 0; background: rgba(0,0,0,0.5); z-index: 2000; align-items: center; justify-content: center; }
.modal.show { display: flex; }
.modal-content { background: var(--bg); border-radius: var(--radius-lg); padding: 48px; text-align: center; max-width: 400px; }
.modal-icon { margin-bottom: 20px; }
.modal-icon svg { width: 64px; height: 64px; }
.modal-content h3 { font-size: 24px; font-weight: 600; margin-bottom: 12px; }
.modal-content p { font-size: 16px; color: var(--text-light); margin-bottom: 24px; }

/* ===== 响应式设计 ===== */
@media (max-width: 1024px) {
    .services-grid { grid-template-columns: repeat(2, 1fr); }
    .matrix-grid { grid-template-columns: repeat(3, 1fr); }
    .more-cases { grid-template-columns: repeat(2, 1fr); }
    .features-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .nav, .header-contact { display: none; }
    .mobile-menu-btn { display: flex; }
    .hero { padding: 120px 0 60px; min-height: auto; }
    .hero .container { flex-direction: column; text-align: center; }
    .hero-title { font-size: 32px; }
    .hero-buttons { justify-content: center; flex-wrap: wrap; }
    .hero-stats { justify-content: center; gap: 32px; }
    .hero-visual { flex: none; margin-top: 40px; }
    .services-grid { grid-template-columns: 1fr; }
    .matrix-grid { grid-template-columns: repeat(2, 1fr); }
    .more-cases { grid-template-columns: 1fr; }
    .process-timeline { flex-direction: column; gap: 32px; }
    .process-timeline::before { display: none; }
    .features-grid { grid-template-columns: 1fr; }
    .contact-wrapper { grid-template-columns: 1fr; }
    .footer-content { grid-template-columns: 1fr; }
    .footer-links { grid-template-columns: repeat(2, 1fr); }
    .section { padding: 60px 0; }
    .section-title { font-size: 28px; }
}