:root {
    /* 主色调 - 现代科技蓝紫渐变 (与API页面一致) */
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #60a5fa;
    --primary-50: #eff6ff;
    --primary-100: #dbeafe;
    --primary-200: #bfdbfe;
    --primary-300: #93c5fd;
    --primary-400: #60a5fa;
    --primary-500: #3b82f6;
    --primary-600: #2563eb; /* Main Primary */
    --primary-700: #1d4ed8;
    --primary-800: #1e40af;
    --primary-900: #1e3a8a;

    /* 辅助色 */
    --secondary: #64748b;
    --accent-purple: #8b5cf6;
    --accent-orange: #f97316;
    --accent-green: #10b981;
    --accent-pink: #ec4899;
    --accent-cyan: #06b6d4;

    /* 文字颜色 */
    --text-main: #0f172a;
    --text-muted: #475569;
    --text-light: #94a3b8;
    --text-lighter: #cbd5e1;
    --text-white: #ffffff;

    /* 背景色 */
    --bg-body: #ffffff;
    --bg-soft: #f8fafc;
    --bg-card: #ffffff;
    --bg-dark: #0f172a;
    --border-color: rgba(226, 232, 240, 0.8);

    /* 表面颜色 */
    --surface-50: #f8fafc;
    --surface-100: #f1f5f9;
    --surface-200: #e2e8f0;
    --surface-800: #1e293b;
    --surface-900: #0f172a;

    /* Gradients (与API页面一致) */
    --gradient-primary: linear-gradient(135deg, #2563eb 0%, #7c3aed 50%, #ec4899 100%);
    --gradient-hover: linear-gradient(135deg, #1d4ed8 0%, #6d28d9 50%, #db2777 100%);
    --gradient-text: linear-gradient(135deg, #2563eb 0%, #7c3aed 50%, #ec4899 100%);
    --gradient-surface: linear-gradient(180deg, #ffffff 0%, #f8fafc 50%, #f1f5f9 100%);
    --gradient-subtle: linear-gradient(135deg, rgba(37,99,235,0.1) 0%, rgba(124,58,237,0.1) 100%);

    /* Shadows */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.025);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.05), 0 10px 10px -5px rgba(0, 0, 0, 0.02);
    --shadow-glow: 0 10px 30px -5px rgba(37, 99, 235, 0.2);
    --shadow-color: 0 10px 30px -5px rgba(37, 99, 235, 0.2);

    /* Layout */
    --container-width: 1280px;
    --header-height: 80px;
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
}

/* Reset */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    background: var(--bg-body);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

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

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Utilities */
.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--surface-50);
}

::-webkit-scrollbar-thumb {
    background: var(--surface-200);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary);
}

/* Section Styles */
.section {
    padding: 3rem 0;
}

.section-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 1.5rem;
    width: 100%;
}

.section-header {
    margin-bottom: 2rem;
}

.section-header.text-center {
    text-align: center;
}

.section-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1.25rem;
    background: var(--gradient-subtle);
    border-radius: 100px;
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 1.5rem;
    border: 1px solid rgba(37, 99, 235, 0.15);
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.1);
}

.section-title {
    font-size: 3rem;
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    letter-spacing: -0.02em;
    color: var(--text-main);
}

.section-subtitle {
    font-size: 1.2rem;
    color: var(--text-light);
    line-height: 1.8;
    max-width: 700px;
}

.section-header.text-center .section-subtitle {
    margin: 0 auto;
}

.text-gradient-primary {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.text-center {
    text-align: center;
}

/* Responsive Section Styles */
@media (max-width: 768px) {
    .section {
        padding: 2rem 0;
    }
    
    .section-header {
        margin-bottom: 1.5rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .section-subtitle {
        font-size: 1.1rem;
    }
    
    .section-badge {
        font-size: 0.8rem;
        padding: 0.4rem 1rem;
    }
}