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#1d4ed8;--color-primary-light: #3b82f6;--color-accent: #06b6d4;--color-bg: #ffffff;--color-bg-alt: #f8fafc;--color-bg-dark: #0f172a;--color-bg-hero: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);--color-text: #1e293b;--color-text-light: #64748b;--color-text-inverse: #f1f5f9;--color-border: #e2e8f0;--color-card-bg: #ffffff;--color-card-shadow: 0 1px 3px rgba(0, 0, 0, .08), 0 4px 12px rgba(0, 0, 0, .04);--color-card-shadow-hover: 0 4px 12px rgba(0, 0, 0, .1), 0 8px 24px rgba(0, 0, 0, .06);--font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;--font-mono: "SF Mono", "Cascadia Code", "Consolas", monospace;--max-width: 1200px;--nav-height: 64px;--section-padding: 96px 0;--border-radius: 12px;--border-radius-sm: 8px;--transition: .2s ease}*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:var(--font-family);color:var(--color-text);background:var(--color-bg);line-height:1.6}a{color:inherit;text-decoration:none}img{max-width:100%;height:auto;display:block}button{font-family:inherit;cursor:pointer;border:none;background:none}.container{max-width:var(--max-width);margin:0 auto;padding:0 24px}.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 28px;border-radius:var(--border-radius-sm);font-size:1rem;font-weight:600;transition:all var(--transition);white-space:nowrap}.btn-primary{background:var(--color-primary);color:#fff}.btn-primary:hover{background:var(--color-primary-dark);transform:translateY(-1px);box-shadow:0 4px 16px #2563eb4d}.btn-outline{border:2px solid var(--color-border);color:var(--color-text);background:transparent}.btn-outline:hover{border-color:var(--color-primary);color:var(--color-primary)}.btn-large{padding:16px 36px;font-size:1.125rem;border-radius:var(--border-radius)}.btn-hero{background:#fff;color:var(--color-primary);font-weight:700}.btn-hero:hover{transform:translateY(-2px);box-shadow:0 6px 24px #fff3}.section-title{font-size:2.25rem;font-weight:700;text-align:center;margin-bottom:16px;color:var(--color-text)}.section-subtitle{font-size:1.125rem;text-align:center;color:var(--color-text-light);max-width:640px;margin:0 auto 56px}@media(max-width:768px){:root{--section-padding: 64px 0;--nav-height: 56px}.section-title{font-size:1.75rem}.btn-large{padding:14px 28px;font-size:1rem}}