* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.8;
    color: #1e293b;
    background-color: #f8fafc;
    overflow-x: hidden;
}

/* 滚动条美化 */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: #e2e8f0;
}
::-webkit-scrollbar-thumb {
    background: #2563eb;
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: #1d4ed8;
}

header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.08);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.8rem;
    font-weight: 800;
    color: #2563eb;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo::before {
    content: "⚡";
    font-size: 1.5rem;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2.5rem;
}

.nav-links a {
    text-decoration: none;
    color: #64748b;
    font-weight: 500;
    font-size: 1rem;
    transition: all 0.3s;
    position: relative;
    padding: 0.5rem 0;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, #2563eb, #60a5fa);
    transition: width 0.3s;
}

.nav-links a:hover {
    color: #2563eb;
}

.nav-links a:hover::after {
    width: 100%;
}

main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Hero 区域 */
.hero {
    text-align: center;
    padding: 8rem 2rem 5rem;
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 50%, #bfdbfe 100%);
    border-radius: 0 0 50px 50px;
    margin: 0 -2rem 3rem;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.1) 0%, transparent 70%);
    animation: pulse 8s ease-in-out infinite;
}

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

.hero::after {
    content: '🚀';
    position: absolute;
    top: 20%;
    right: 10%;
    font-size: 5rem;
    opacity: 0.2;
    animation: float 3s ease-in-out infinite;
}

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

.hero-content {
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    color: #1e3a8a;
    margin-bottom: 1.5rem;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 1.4rem;
    color: #64748b;
    margin-bottom: 2.5rem;
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.subtitle span {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.cta-buttons {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2.5rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
    color: #fff;
    box-shadow: 0 10px 40px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 50px rgba(37, 99, 235, 0.4);
}

.btn-secondary {
    background: #fff;
    color: #2563eb;
    border: 2px solid #2563eb;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

.btn-secondary:hover {
    background: #2563eb;
    color: #fff;
    transform: translateY(-3px);
}

.btn-large {
    padding: 1.2rem 3rem;
    font-size: 1.2rem;
}

section {
    padding: 5rem 0;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: #1e3a8a;
    margin-bottom: 1rem;
}

.section-desc {
    font-size: 1.1rem;
    color: #64748b;
    max-width: 600px;
    margin: 0 auto;
}

/* 功能卡片 */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.feature-item {
    padding: 2.5rem;
    background: #fff;
    border-radius: 20px;
    border: 1px solid #e2e8f0;
    transition: all 0.4s;
    position: relative;
    overflow: hidden;
}

.feature-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #2563eb, #60a5fa);
    transform: scaleX(0);
    transition: transform 0.4s;
}

.feature-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 25px 50px rgba(37, 99, 235, 0.15);
    border-color: #bfdbfe;
}

.feature-item:hover::before {
    transform: scaleX(1);
}

.feature-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin-bottom: 1.5rem;
}

.feature-item h3 {
    color: #1e3a8a;
    margin-bottom: 1rem;
    font-size: 1.4rem;
}

.feature-item p {
    color: #64748b;
    line-height: 1.8;
}

/* 数据统计 */
.stats {
    background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 50%, #3b82f6 100%);
    color: #fff;
    padding: 5rem 2rem;
    border-radius: 30px;
    margin: 3rem 0;
    position: relative;
    overflow: hidden;
}

.stats::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.stats h2 {
    color: #fff;
    position: relative;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 3rem;
    text-align: center;
    position: relative;
}

.stat-item {
    padding: 2rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    backdrop-filter: blur(10px);
    transition: transform 0.3s;
}

.stat-item:hover {
    transform: scale(1.05);
}

.stat-number {
    display: block;
    font-size: 3rem;
    font-weight: 800;
    color: #fff;
    margin-bottom: 0.5rem;
}

.stat-label {
    display: block;
    font-size: 1.1rem;
    color: #bfdbfe;
}

/* 步骤 */
.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
    counter-reset: step;
}

.step {
    text-align: center;
    padding: 3rem 2rem;
    background: #fff;
    border-radius: 24px;
    position: relative;
    border: 1px solid #e2e8f0;
    transition: all 0.3s;
}

.step:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
}

.step-number {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #2563eb 0%, #3b82f6 100%);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: 800;
    margin: 0 auto 1.5rem;
    box-shadow: 0 10px 30px rgba(37, 99, 235, 0.3);
}

.step h3 {
    color: #1e3a8a;
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.step p {
    color: #64748b;
}

/* FAQ */
.faq {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    margin-bottom: 1.5rem;
    padding: 2rem;
    background: #fff;
    border-radius: 16px;
    border: 1px solid #e2e8f0;
    transition: all 0.3s;
}

.faq-item:hover {
    border-color: #bfdbfe;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
}

.faq-item h3 {
    color: #1e3a8a;
    margin-bottom: 1rem;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.faq-item h3::before {
    content: "❓";
    font-size: 1.5rem;
}

.faq-item p {
    color: #64748b;
    padding-left: 2.25rem;
}

/* CTA 区域 */
.cta-section {
    text-align: center;
    padding: 5rem 2rem;
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
    border-radius: 30px;
    margin: 3rem 0;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: "💫";
    position: absolute;
    top: 10%;
    left: 5%;
    font-size: 3rem;
    opacity: 0.3;
}

.cta-section::after {
    content: "✨";
    position: absolute;
    bottom: 10%;
    right: 5%;
    font-size: 3rem;
    opacity: 0.3;
}

.cta-section h2 {
    margin-bottom: 1rem;
}

.cta-section p {
    margin-bottom: 2.5rem;
    color: #64748b;
    font-size: 1.2rem;
}

/* Footer */
footer {
    background: linear-gradient(135deg, #1e3a8a 0%, #1e40af 100%);
    color: #fff;
    padding: 5rem 2rem 2rem;
    margin-top: 5rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
}

.footer-section h4 {
    margin-bottom: 1.5rem;
    font-size: 1.3rem;
    color: #60a5fa;
}

.footer-section p {
    color: #94a3b8;
    line-height: 1.8;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.75rem;
}

.footer-section a {
    color: #cbd5e1;
    text-decoration: none;
    transition: all 0.3s;
}

.footer-section a:hover {
    color: #60a5fa;
    padding-left: 5px;
}

.footer-bottom {
    text-align: center;
    padding-top: 3rem;
    margin-top: 3rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: #94a3b8;
}

.footer-bottom a {
    color: #60a5fa;
}

/* 响应式 */
@media (max-width: 768px) {
    nav {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-links {
        gap: 1.5rem;
    }

    .hero {
        padding: 6rem 1.5rem 3rem;
        border-radius: 0 0 30px 30px;
    }

    .hero h1 {
        font-size: 2.2rem;
    }

    .subtitle {
        flex-direction: column;
        gap: 0.75rem;
    }

    h2 {
        font-size: 1.8rem;
    }

    .feature-grid {
        grid-template-columns: 1fr;
    }

    .stats {
        padding: 3rem 1.5rem;
        border-radius: 20px;
    }

    .stat-number {
        font-size: 2rem;
    }

    .cta-section {
        padding: 3rem 1.5rem;
        border-radius: 20px;
    }
}