:root {
    --color-primary: #1e3a8a;
    --color-primary-dark: #172554;
    --color-accent: #06b6d4;
    --color-surface: #ecfeff;
    --color-text: #0f172a;
    --rgb-primary: 30,58,138;
    --rgb-accent: 6,182,212;
    --radius-sm: 2px;
    --radius-md: 6px;
    --radius-lg: 12px;
    --radius-xl: 20px;
    --shadow-sm: 0 1px 2px rgba(30,58,138,0.08), 0 1px 1px rgba(6,182,212,0.06);
    --shadow-md: 0 4px 12px rgba(30,58,138,0.12), 0 2px 4px rgba(6,182,212,0.08);
    --shadow-lg: 0 12px 32px rgba(30,58,138,0.16), 0 4px 8px rgba(6,182,212,0.1);
    --space-section: 2.2rem;
    --space-card: 1.1rem;
    --space-gap: 0.8rem;
    --transition: 0.5s cubic-bezier(0.22, 1, 0.36, 1);
    --heading-weight: 600;
    --body-line-height: 1.75;
}

body { color: var(--color-text); line-height: var(--body-line-height); background: linear-gradient(160deg, #f0f9ff 0%, #ecfeff 50%, #f5f3ff 100%); }
h1, h2, h3, h4 { font-weight: var(--heading-weight); }
section, .section { padding-top: var(--space-section); padding-bottom: var(--space-section); }
section:nth-child(odd), .section:nth-child(odd) { background: linear-gradient(135deg, rgba(30,58,138,0.04) 0%, rgba(6,182,212,0.06) 100%); }
section:nth-child(even), .section:nth-child(even) { background: linear-gradient(225deg, rgba(6,182,212,0.05) 0%, rgba(139,92,246,0.04) 100%); }
.card, [class*="card"] { border-radius: var(--radius-lg); box-shadow: var(--shadow-md); padding: var(--space-card); transition: var(--transition); background: linear-gradient(145deg, #ffffff 0%, #f0f9ff 100%); border: 1px solid rgba(30,58,138,0.1); }
.card:hover, [class*="card"]:hover { box-shadow: var(--shadow-lg); border-color: rgba(6,182,212,0.3); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%); color: #ffffff; border: none; box-shadow: 0 2px 8px rgba(30,58,138,0.25); }
.btn:hover, button[class*="btn"]:hover, a[class*="btn"]:hover { background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%); box-shadow: 0 6px 20px rgba(30,58,138,0.3); }
a:not([class]) { color: var(--color-primary); transition: var(--transition); }
a:not([class]):hover { color: var(--color-accent); }

/* ========== Section Layout Variants ========== */

/* news: grid-4 */
/* 四列紧凑网格 */
                .news-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: calc(var(--space-gap) * 0.8); }

/* features: horizontal */
/* 水平滚动 */
                .feature-list { display: flex; gap: var(--space-gap); overflow-x: auto; scroll-snap-type: x mandatory; }
                .feature-list > * { flex: 0 0 300px; scroll-snap-align: start; }

/* hero: overlay */
/* 全屏背景+文字覆盖 */
                .hero { position: relative; min-height: 70vh; display: flex; align-items: center; background: linear-gradient(135deg, #1e3a8a 0%, #06b6d4 50%, #8b5cf6 100%); }
                .hero-content { position: relative; z-index: 1; }

/* testimonials: masonry */
.testimonial-list { column-count: 2; column-gap: var(--space-gap); }
                .testimonial-list > * { break-inside: avoid; margin-bottom: var(--space-gap); }

/* partners: grid-4 */
.partner-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: calc(var(--space-gap) * 1.5); align-items: center; }

/* faq: with-sidebar */
/* FAQ 左 + 联系信息右 */
                .faq-wrapper { display: grid; grid-template-columns: 2fr 1fr; gap: 2rem; }

/* stats: inline */
/* 水平排列 */
                .stats-grid { display: flex; justify-content: center; gap: 3rem; }

/* cta: split */
.cta-inner { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 2rem; background: linear-gradient(120deg, rgba(30,58,138,0.06) 0%, rgba(6,182,212,0.08) 100%); border-radius: var(--radius-xl); padding: 2rem; border: 2px solid transparent; border-image: linear-gradient(135deg, var(--color-primary), var(--color-accent)) 1; }

/* Page Layout: full-width */
/* 无侧边栏, 全宽 */
            .page-main { max-width: 1200px; margin: 0 auto; }

/* 条件性装饰 */
header, .header, .navbar { background: linear-gradient(90deg, rgba(30,58,138,0.03) 0%, rgba(6,182,212,0.05) 100%); backdrop-filter: blur(12px); }

/* Responsive */
@media (max-width: 1024px) {
    .news-grid { grid-template-columns: repeat(2, 1fr) !important; }
    .feature-list { grid-template-columns: repeat(2, 1fr) !important; }
    .partner-grid { grid-template-columns: repeat(3, 1fr) !important; }
    .stats-grid { grid-template-columns: repeat(2, 1fr) !important; }
    .hero-inner { grid-template-columns: 1fr !important; }
}
@media (max-width: 640px) {
    :root { --space-section: 2rem; --space-card: 1rem; --space-gap: 0.75rem; }
    .news-grid { grid-template-columns: 1fr !important; }
    .feature-list { grid-template-columns: 1fr !important; }
    .faq-list { grid-template-columns: 1fr !important; }
    .testimonial-list { column-count: 1 !important; }
    .partner-grid { grid-template-columns: repeat(2, 1fr) !important; }
    .stats-grid { grid-template-columns: repeat(2, 1fr) !important; }
    .cta-inner { grid-template-columns: 1fr !important; }
}