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

body {
    font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: #f9fafc;
    color: #1e293b;
    line-height: 1.5;
    scroll-behavior: smooth;
}

/* 自定义滚动条 */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: #eef2f6;
}
::-webkit-scrollbar-thumb {
    background: #b9c3d0;
    border-radius: 6px;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

/* 导航栏 */
.navbar {
    background-color: #ffffff;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05), 0 1px 2px rgba(0,0,0,0.03);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(0px);
}
.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
    padding: 16px 24px;
}
.logo {
    font-size: 1.7rem;
    font-weight: 800;
    background: linear-gradient(135deg, #1E3A8A, #3B82F6);
    background-clip: text;
    -webkit-background-clip: text;
    color: transparent;
    letter-spacing: -0.3px;
}
.logo span {
    background: none;
    color: #1e40af;
}
.nav-links {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 1.5rem;
    list-style: none;
}
.nav-links li a {
    text-decoration: none;
    color: #334155;
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.2s;
}
.nav-links li a:hover {
    color: #3b82f6;
}
.nav-buttons {
    display: flex;
    align-items: center;
    gap: 1rem;
}
.btn-outline {
    border: 1px solid #cbd5e1;
    background: transparent;
    padding: 6px 16px;
    border-radius: 40px;
    font-weight: 500;
    font-size: 0.9rem;
    color: #1f2937;
    transition: all 0.2s;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
}
.btn-outline:hover {
    border-color: #3b82f6;
    color: #3b82f6;
    background: #f0f9ff;
}
.btn-primary {
    background: #3b82f6;
    color: white;
    border: none;
    padding: 6px 20px;
    border-radius: 40px;
    font-weight: 600;
    font-size: 0.9rem;
    transition: all 0.2s;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}
.btn-primary:hover {
    background: #2563eb;
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(59,130,246,0.2);
}
.login-reg {
    display: flex;
    gap: 8px;
    align-items: center;
}
.login-reg a {
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    color: #475569;
}
.login-reg a:first-child {
    border-right: 1px solid #cbd5e1;
    padding-right: 10px;
}
.login-reg a:hover {
    color: #3b82f6;
}

/* Hero 历史数据分析区 */
.hero {
    background: linear-gradient(135deg, #EFF6FF 0%, #FFFFFF 100%);
    border-radius: 2rem;
    margin: 40px auto;
    padding: 48px 40px;
    box-shadow: 0 8px 20px rgba(0,0,0,0.02), 0 2px 6px rgba(0,0,0,0.05);
    border: 1px solid rgba(59,130,246,0.1);
}
.hero-grid {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 40px;
    justify-content: space-between;
}
.hero-content {
    flex: 1.2;
    min-width: 260px;
}
.hero-badge {
    background: #e0f2fe;
    color: #0369a1;
    display: inline-block;
    padding: 4px 12px;
    border-radius: 30px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 20px;
}
.hero-content h1 {
    font-size: 2.8rem;
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: -0.02em;
    background: linear-gradient(to right, #1E2A5E, #2563eb);
    background-clip: text;
    -webkit-background-clip: text;
    color: transparent;
    margin-bottom: 16px;
}
.hero-content p {
    font-size: 1.2rem;
    color: #334155;
    margin-bottom: 28px;
    max-width: 90%;
}
.hero-stats {
    display: flex;
    gap: 32px;
    margin-top: 20px;
    flex-wrap: wrap;
}
.stat-item {
    background: white;
    padding: 12px 20px;
    border-radius: 40px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.03);
    border: 1px solid #e2e8f0;
}
.stat-number {
    font-weight: 800;
    font-size: 1.6rem;
    color: #1e293b;
}
.stat-label {
    font-size: 0.8rem;
    color: #5b6e8c;
}
.hero-cta {
    margin-top: 10px;
}
.btn-large {
    padding: 12px 32px;
    font-size: 1rem;
    border-radius: 40px;
    background: #3b82f6;
    color: white;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s;
}
.btn-large:hover {
    background: #2563eb;
    transform: translateY(-2px);
    box-shadow: 0 10px 20px -5px rgba(59,130,246,0.4);
}
.hero-visual {
    flex: 0.8;
    background: rgba(255,255,255,0.7);
    border-radius: 2rem;
    padding: 20px;
    text-align: center;
    backdrop-filter: blur(2px);
}
.chart-mock {
    background: white;
    border-radius: 24px;
    padding: 16px;
    box-shadow: 0 10px 25px -5px rgba(0,0,0,0.05);
}
.bar-group {
    margin: 12px 0;
}
.bar {
    background: #3b82f6;
    height: 10px;
    border-radius: 20px;
    margin: 8px 0;
    width: 0%;
    animation: grow 1s ease-out forwards;
}
@keyframes grow {
    from { width: 0; }
    to { width: var(--w); }
}

/* 通用section */
.section-title {
    font-size: 2rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 48px;
    letter-spacing: -0.3px;
    position: relative;
}
.section-title:after {
    content: '';
    display: block;
    width: 64px;
    height: 4px;
    background: linear-gradient(90deg, #3b82f6, #a5f3fc);
    border-radius: 4px;
    margin: 12px auto 0;
}

/* 功能卡片网格 */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 30px;
    margin: 40px 0 60px;
}
.feature-card {
    background: #ffffff;
    border-radius: 28px;
    padding: 28px 24px;
    transition: all 0.25s ease;
    box-shadow: 0 5px 15px rgba(0,0,0,0.02), 0 1px 2px rgba(0,0,0,0.05);
    border: 1px solid #eef2f8;
}
.feature-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 20px 30px -12px rgba(0,0,0,0.1);
    border-color: #cbdffc;
}
.card-icon {
    font-size: 2.5rem;
    color: #3b82f6;
    margin-bottom: 20px;
}
.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 12px;
}
.feature-card p {
    color: #475569;
    margin-bottom: 24px;
    line-height: 1.5;
}
.card-link {
    text-decoration: none;
    font-weight: 600;
    color: #3b82f6;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: gap 0.2s;
}
.card-link i {
    font-size: 0.9rem;
}
.card-link:hover {
    gap: 10px;
    color: #1e40af;
}

/* 客户展示区 */
.clients-section {
    background: #ffffff;
    border-radius: 2rem;
    padding: 48px 32px;
    margin: 40px 0 60px;
    text-align: center;
    box-shadow: 0 4px 12px rgba(0,0,0,0.02);
    border: 1px solid #edf2f7;
}
.clients-logos {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 48px;
    margin-top: 32px;
    align-items: center;
}
.client-item {
    background: #f8fafc;
    padding: 12px 28px;
    border-radius: 60px;
    font-weight: 600;
    font-size: 1.2rem;
    color: #1f2a44;
    display: flex;
    align-items: center;
    gap: 12px;
    transition: all 0.2s;
    border: 1px solid #e2e8f0;
}
.client-item i {
    font-size: 1.6rem;
    color: #3b82f6;
}
.client-item:hover {
    background: #eff6ff;
    border-color: #b9d0f8;
    transform: scale(1.02);
}

/* 底部 */
.footer {
    border-top: 1px solid #e2e8f0;
    background: #ffffff;
    padding: 32px 0;
    margin-top: 40px;
    text-align: center;
    color: #5b6e8c;
    font-size: 0.85rem;
}

/* 响应式 */
@media (max-width: 900px) {
    .nav-container {
        flex-direction: column;
        align-items: stretch;
    }
    .nav-links {
        justify-content: center;
    }
    .nav-buttons {
        justify-content: center;
    }
    .hero-grid {
        flex-direction: column;
    }
    .hero-content h1 {
        font-size: 2rem;
    }
    .hero-content p {
        max-width: 100%;
    }
    .section-title {
        font-size: 1.8rem;
    }
    .clients-logos {
        gap: 20px;
    }
}
@media (max-width: 640px) {
    .container {
        padding: 0 16px;
    }
    .hero {
        padding: 32px 20px;
    }
    .cards-grid {
        gap: 20px;
    }
    .client-item {
        padding: 8px 20px;
        font-size: 1rem;
    }
}

button, a {
    cursor: pointer;
}
.text-accent {
    color: #3b82f6;
}