:root {
    --color-primary: #1e40af;
    --color-primary-dark: #1e3a8a;
    --color-accent: #3b82f6;
    --color-surface: #f1f5f9;
    --color-text: #1e293b;
    --rgb-primary: 30,64,175;
    --rgb-accent: 59,130,246;
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --shadow-sm: 0 1px 3px rgba(30,41,59,.12), 0 1px 2px rgba(30,41,59,.08);
    --shadow-md: 0 4px 12px rgba(30,41,59,.15), 0 2px 4px rgba(30,41,59,.08), inset 0 1px 0 rgba(255,255,255,.6);
    --shadow-lg: 0 8px 24px rgba(30,41,59,.18), 0 4px 8px rgba(30,41,59,.1), 0 1px 3px rgba(30,41,59,.06);
    --space-section: 4rem;
    --space-card: 1.5rem;
    --space-gap: 1.25rem;
    --transition: 0.5s cubic-bezier(0.25,0.46,0.45,0.94);
    --heading-weight: 600;
    --body-line-height: 1.65;
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: linear-gradient(160deg, #f8fafc 0%, #e2e8f0 50%, #f1f5f9 100%); }
h1, h2, h3, h4 { font-weight: var(--heading-weight); color: #1e293b; }
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%, #f8fafc 60%, #f1f5f9 100%); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); background: linear-gradient(135deg, #3b82f6 0%, #1e40af 50%, #1e3a8a 100%); color: #ffffff; box-shadow: 0 2px 8px rgba(59,130,246,.35), 0 1px 3px rgba(30,58,138,.2); }
a:not([class]) { color: var(--color-primary); transition: var(--transition); }

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

/* news: masonry-2 */
/* 两列瀑布流 */
                .news-grid { column-count: 2; column-gap: var(--space-gap); }
                .news-grid .card { break-inside: avoid; margin-bottom: var(--space-gap); }

/* 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: split */
/* 左文右图 */
                .hero-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; align-items: center; background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%); border-radius: var(--radius-xl); }

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

/* partners: scroll */
/* 自动滚动 */
                .partner-grid { display: flex; gap: 2rem; overflow: hidden; animation: partnerScroll 20s linear infinite; }
                @keyframes partnerScroll { 0% { transform: translateX(0); } 100% { transform: translateX(-50%); } }

/* 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; }

/* cta: card-style */
.cta-inner { background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 40%, #bfdbfe 100%); border-radius: var(--radius-xl); padding: 3rem; text-align: center; box-shadow: 0 8px 32px rgba(59,130,246,.12), 0 2px 8px rgba(30,64,175,.08); }

/* Page Layout: narrow-centered */
/* 窄版居中 */
            .page-main { max-width: 860px; margin: 0 auto; }

/* 条件性装饰 */
.card { border: 1px solid rgba(var(--rgb-primary), .08); border-image: linear-gradient(135deg, rgba(59,130,246,.2), rgba(30,64,175,.08), rgba(59,130,246,.15)) 1; background-clip: padding-box; }
header, .header, .navbar { background: linear-gradient(180deg, rgba(248,250,252,.95) 0%, rgba(241,245,249,.85) 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; }
}