:root {
    --color-primary: #3b82a8;
    --color-primary-dark: #1a2332;
    --color-accent: #e8943a;
    --color-surface: #f0f4f9;
    --color-text: #1a2332;
    --rgb-primary: 59,130,168;
    --rgb-accent: 232,148,58;
    --radius-sm: 3px;
    --radius-md: 6px;
    --radius-lg: 10px;
    --radius-xl: 14px;
    --shadow-sm: 0 1px 3px rgba(26,35,50,0.08), 0 1px 2px rgba(26,35,50,0.06);
    --shadow-md: 0 4px 12px rgba(26,35,50,0.1), 0 2px 4px rgba(26,35,50,0.06);
    --shadow-lg: 0 12px 28px rgba(26,35,50,0.14), 0 4px 10px rgba(26,35,50,0.08);
    --space-section: 5rem;
    --space-card: 2rem;
    --space-gap: 1.5rem;
    --transition: 0.45s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --heading-weight: 600;
    --body-line-height: 1.75;
}

body { color: var(--color-text); line-height: var(--body-line-height); background: linear-gradient(180deg, #f7fafd 0%, #eef3fa 100%); }
h1, h2, h3, h4 { font-weight: var(--heading-weight); background: linear-gradient(135deg, #1a2332 0%, #3b82a8 100%); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
section, .section { padding-top: var(--space-section); padding-bottom: var(--space-section); }
.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%, #f0f4f9 100%); border: 1px solid rgba(59,130,168,0.08); }
.card:hover, [class*="card"]:hover { box-shadow: var(--shadow-lg); border-color: rgba(59,130,168,0.18); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); background: linear-gradient(135deg, #3b82a8 0%, #2a6d8f 100%); color: #ffffff; border: none; box-shadow: 0 2px 8px rgba(59,130,168,0.3); }
.btn:hover, button[class*="btn"]:hover, a[class*="btn"]:hover { background: linear-gradient(135deg, #2a6d8f 0%, #1a2332 100%); box-shadow: 0 6px 16px rgba(59,130,168,0.4); }
a:not([class]) { color: var(--color-primary); transition: var(--transition); }
a:not([class]):hover { color: var(--color-accent); }

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

/* news: featured-top */
/* 首篇横跨全宽 */
                .news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }
                .news-grid > *:first-child { grid-column: span 3; background: linear-gradient(135deg, #eef3fa 0%, #dce8f5 50%, #cde0f0 100%); border-radius: var(--radius-lg); }

/* 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; background: linear-gradient(160deg, #ffffff 0%, #f0f4f9 100%); border-radius: var(--radius-md); }

/* hero: split */
/* 左文右图 */
                .hero-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; align-items: center; background: radial-gradient(ellipse at 30% 50%, rgba(59,130,168,0.06) 0%, transparent 70%); border-radius: var(--radius-xl); }

/* testimonials: carousel */
/* 单条轮播 */
                .testimonial-list { display: flex; overflow: hidden; } 
                .testimonial-list > * { flex: 0 0 100%; background: linear-gradient(135deg, #f0f4f9 0%, #e4edf6 100%); border-radius: var(--radius-lg); }

/* partners: grid-6 */
.partner-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: var(--space-gap); align-items: center; }

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

/* stats: grid-3 */
.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); text-align: center; background: linear-gradient(135deg, #1a2332 0%, #252e3a 100%); border-radius: var(--radius-xl); padding: 2.5rem 1.5rem; color: #e4edf6; }
.stats-grid > * { background: linear-gradient(160deg, rgba(59,130,168,0.15) 0%, rgba(59,130,168,0.05) 100%); border-radius: var(--radius-md); padding: 1.25rem; border: 1px solid rgba(59,130,168,0.2); }

/* cta: card-style */
.cta-inner { background: linear-gradient(135deg, #eef3fa 0%, #dce8f5 50%, #c5d9ee 100%); border-radius: var(--radius-xl); padding: 3rem; text-align: center; box-shadow: var(--shadow-lg); border: 1px solid rgba(59,130,168,0.1); }

/* Page Layout: wide */
/* 超宽 */
            .page-main { max-width: 1400px; margin: 0 auto; }

/* 条件性装饰 */

/* 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; }
}