/* ========== 基础样式 ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #007AFF;
    --primary-dark: #0051D5;
    --secondary: #34C759;
    --accent: #FF9500;
    --purple: #AF52DE;
    --red: #FF3B30;
    --indigo: #5856D6;
    
    --bg-primary: #ffffff;
    --bg-secondary: #F5F5F7;
    --bg-tertiary: #FAFAFA;
    
    --text-primary: #1D1D1F;
    --text-secondary: #86868B;
    --text-tertiary: #6E6E73;
    
    --border: #D2D2D7;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);
    
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 18px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a {
    text-decoration: none;
    color: inherit;
}

/* ========== 导航栏 ========== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.72);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
    font-size: 18px;
    color: var(--text-primary);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav-links a {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition);
}

.nav-links a:hover {
    color: var(--text-primary);
}

.nav-cta {
    background: var(--primary);
    color: white !important;
    padding: 8px 18px;
    border-radius: var(--radius-full);
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
}

.nav-cta:hover {
    background: var(--primary-dark);
    transform: scale(1.02);
}

/* ========== Hero 区域 ========== */
.hero {
    min-height: 100vh;
    padding: 140px 24px 80px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto;
    gap: 60px;
    position: relative;
    overflow: hidden;
}

.hero-content {
    flex: 1;
    max-width: 560px;
}

.hero-title {
    font-size: 72px;
    font-weight: 700;
    line-height: 1.05;
    letter-spacing: -0.03em;
    margin-bottom: 24px;
}

.gradient-text {
    background: linear-gradient(135deg, #007AFF 0%, #5856D6 50%, #AF52DE 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 21px;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.5;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    background: var(--primary);
    color: white;
    padding: 16px 28px;
    border-radius: var(--radius-full);
    font-size: 16px;
    font-weight: 500;
    transition: var(--transition);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    color: var(--primary);
    padding: 16px 28px;
    font-size: 16px;
    font-weight: 500;
    transition: var(--transition);
}

.btn-secondary:hover {
    transform: translateX(4px);
}

.hero-visual {
    flex: 1;
    position: relative;
    height: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.glow-circle {
    position: absolute;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(0, 122, 255, 0.15) 0%, transparent 70%);
    border-radius: 50%;
    animation: pulse 4s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.8; }
    50% { transform: scale(1.1); opacity: 0.5; }
}

.floating-card {
    position: absolute;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    border-radius: var(--radius-lg);
    padding: 20px 28px;
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 14px;
    animation: float 6s ease-in-out infinite;
}

.card-1 {
    top: 20%;
    left: 10%;
    animation-delay: 0s;
}

.card-2 {
    top: 45%;
    right: 5%;
    animation-delay: -2s;
}

.card-3 {
    bottom: 20%;
    left: 20%;
    animation-delay: -4s;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

.card-icon {
    font-size: 28px;
}

.card-text {
    font-weight: 600;
    font-size: 16px;
}

/* ========== 统计数据 ========== */
.stats {
    background: var(--bg-secondary);
    padding: 80px 24px;
}

.stats-container {
    max-width: 1000px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    text-align: center;
}

.stat-number {
    font-size: 56px;
    font-weight: 700;
    color: var(--primary);
    line-height: 1;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 16px;
    color: var(--text-secondary);
    font-weight: 500;
}

/* ========== 通用区域标题 ========== */
.section-header {
    text-align: center;
    margin-bottom: 60px;
    padding: 0 24px;
}

.section-title {
    font-size: 48px;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 16px;
}

.section-subtitle {
    font-size: 20px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ========== 服务介绍 ========== */
.services {
    padding: 120px 24px;
    max-width: 1200px;
    margin: 0 auto;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.service-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    padding: 40px 32px;
    transition: var(--transition);
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    background: var(--bg-primary);
}

.service-icon {
    margin-bottom: 24px;
}

.service-card h3 {
    font-size: 21px;
    font-weight: 600;
    margin-bottom: 12px;
}

.service-card p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ========== 关于我们 ========== */
.about {
    padding: 120px 24px;
    background: var(--bg-secondary);
}

.about-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.about-content .section-title {
    text-align: left;
    margin-bottom: 32px;
}

.about-text {
    font-size: 17px;
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.8;
}

.about-features {
    margin-top: 40px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.feature {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 16px;
    font-weight: 500;
}

.feature-icon {
    width: 24px;
    height: 24px;
    background: var(--secondary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
}

.about-visual {
    display: flex;
    justify-content: center;
}

.about-card {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    padding: 40px;
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 420px;
}

.about-card-header {
    margin-bottom: 28px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border);
}

.company-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, var(--primary), var(--indigo));
    color: white;
    padding: 10px 18px;
    border-radius: var(--radius-full);
    font-size: 14px;
    font-weight: 500;
}

.badge-icon {
    font-size: 16px;
}

.info-row {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 20px;
}

.info-row:last-child {
    margin-bottom: 0;
}

.info-label {
    font-size: 13px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.info-value {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
}

/* ========== 解决方案 ========== */
.solutions {
    padding: 120px 24px;
    max-width: 1200px;
    margin: 0 auto;
}

.solutions-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.solution-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    padding: 48px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
    transition: var(--transition);
    overflow: hidden;
}

.solution-card:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-lg);
}

.solution-card.large {
    grid-column: span 2;
    background: linear-gradient(135deg, var(--primary) 0%, var(--indigo) 100%);
    color: white;
}

.solution-card.large .solution-tag {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

.solution-card.large p {
    color: rgba(255, 255, 255, 0.8);
}

.solution-card.large .solution-link {
    color: white;
}

.solution-content {
    flex: 1;
}

.solution-tag {
    display: inline-block;
    background: var(--primary);
    color: white;
    padding: 6px 14px;
    border-radius: var(--radius-full);
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 20px;
}

.solution-card h3 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 16px;
}

.solution-card p {
    font-size: 17px;
    color: var(--text-secondary);
    margin-bottom: 24px;
    line-height: 1.6;
}

.solution-link {
    font-size: 16px;
    font-weight: 600;
    color: var(--primary);
    transition: var(--transition);
}

.solution-link:hover {
    opacity: 0.8;
}

.solution-visual {
    flex-shrink: 0;
}

.solution-icon-bg {
    width: 120px;
    height: 120px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 56px;
}

.solution-card.large .solution-icon-bg {
    background: rgba(255, 255, 255, 0.2);
}

/* ========== 联系我们 ========== */
.contact {
    padding: 120px 24px;
    background: var(--bg-secondary);
}

.contact-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
}

.contact-content .section-title {
    text-align: left;
    margin-bottom: 20px;
}

.contact-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 48px;
    line-height: 1.7;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.contact-item {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.contact-icon {
    width: 48px;
    height: 48px;
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    box-shadow: var(--shadow-sm);
    flex-shrink: 0;
}

.contact-detail {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.contact-label {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

.contact-value {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.5;
}

.contact-form-wrapper {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    padding: 48px;
    box-shadow: var(--shadow-lg);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea {
    padding: 14px 18px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 15px;
    font-family: inherit;
    transition: var(--transition);
    background: var(--bg-tertiary);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    background: var(--bg-primary);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.submit-btn {
    background: var(--primary);
    color: white;
    padding: 16px 32px;
    border: none;
    border-radius: var(--radius-full);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 8px;
}

.submit-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ========== 页脚 ========== */
.footer {
    background: var(--bg-primary);
    padding: 80px 24px 40px;
    border-top: 1px solid var(--border);
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
}

.footer-main {
    display: grid;
    grid-template-columns: 2fr 3fr;
    gap: 80px;
    margin-bottom: 60px;
}

.footer-brand {
    max-width: 320px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 20px;
}

.footer-desc {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.7;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.footer-column h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 20px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.footer-column ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.footer-column a {
    font-size: 14px;
    color: var(--text-secondary);
    transition: var(--transition);
}

.footer-column a:hover {
    color: var(--primary);
}

.footer-bottom {
    padding-top: 40px;
    border-top: 1px solid var(--border);
    text-align: center;
}

.footer-bottom p {
    font-size: 13px;
    color: var(--text-secondary);
}

.footer-legal {
    margin-top: 8px;
    color: var(--text-tertiary);
}

/* ========== 响应式设计 ========== */
@media (max-width: 1024px) {
    .hero {
        flex-direction: column;
        text-align: center;
        padding-top: 120px;
    }
    
    .hero-content {
        max-width: 100%;
    }
    
    .hero-title {
        font-size: 56px;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .hero-visual {
        height: 400px;
        width: 100%;
    }
    
    .about-container,
    .contact-container {
        grid-template-columns: 1fr;
        gap: 60px;
    }
    
    .about-content .section-title,
    .contact-content .section-title {
        text-align: center;
    }
    
    .about-visual {
        order: -1;
    }
    
    .solutions-grid {
        grid-template-columns: 1fr;
    }
    
    .solution-card.large {
        grid-column: span 1;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .hero-title {
        font-size: 42px;
    }
    
    .hero-subtitle {
        font-size: 18px;
    }
    
    .section-title {
        font-size: 36px;
    }
    
    .stats-container {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-main {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .floating-card {
        display: none;
    }
    
    .solution-card {
        flex-direction: column;
        text-align: center;
        padding: 32px;
    }
    
    .solution-card.large {
        text-align: left;
    }
    
    .solution-icon-bg {
        width: 80px;
        height: 80px;
        font-size: 40px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 36px;
    }
    
    .stat-number {
        font-size: 40px;
    }
    
    .about-card,
    .contact-form-wrapper {
        padding: 28px;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
}