:root {
    --color-primary: #0ea5e9;
    --color-primary-dark: #075985;
    --color-accent: #22c55e;
    --color-surface: #0b1220;
    --color-text: #e5e7eb;
    --rgb-primary: 14,165,233;
    --rgb-accent: 34,197,94;
    --radius-sm: 3px;
    --radius-md: 5px;
    --radius-lg: 7px;
    --radius-xl: 12px;
    --shadow-sm: 0 1px 0 rgba(255,255,255,.06);
    --shadow-md: 0 6px 18px rgba(0,0,0,.22), 0 1px 0 rgba(255,255,255,.06);
    --shadow-lg: 0 10px 26px rgba(0,0,0,.28), 0 2px 0 rgba(255,255,255,.06), 0 0 0 1px rgba(255,255,255,.06);
    --space-section: 2rem;
    --space-card: 1rem;
    --space-gap: 0.75rem;
    --transition: 160ms cubic-bezier(.2,.8,.2,1);
    --heading-weight: 650;
    --body-line-height: 1.7;
}

body { color: var(--color-text); line-height: var(--body-line-height); }
h1, h2, h3, h4 { font-weight: var(--heading-weight); }
section, .section { padding-top: var(--space-section); padding-bottom: var(--space-section); }
.card, [class*="card"] { border-radius: var(--radius-lg); box-shadow: 0 0 0 1px rgba(255,255,255,.09) inset, 0 10px 30px rgba(0,0,0,.26), 0 2px 8px rgba(0,0,0,.18); padding: var(--space-card); transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background-color var(--transition); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: background-color var(--transition), color var(--transition), box-shadow var(--transition), transform var(--transition); }
a:not([class]) { color: var(--color-primary); transition: color var(--transition), text-shadow var(--transition); text-shadow: 0 0 0 rgba(0,0,0,0); }

/* ========== 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: grid-3 */
.feature-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }

/* hero: split */
/* 左文右图 */
                .hero-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; align-items: center; }

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

/* partners: centered */
.partner-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 2rem; }

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

/* stats: grid-4 */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); text-align: center; }

/* cta: centered */
.cta-inner { text-align: center; max-width: 700px; margin: 0 auto; }

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

/* 条件性装饰 */
.hero, [class*="hero"], section:first-of-type { background: linear-gradient(135deg, rgba(14,165,233,.92) 0%, rgba(7,89,133,.95) 45%, rgba(34,197,94,.75) 100%); box-shadow: 0 0 0 1px rgba(255,255,255,.08) inset, 0 18px 40px rgba(0,0,0,.28); }
.card { border-left: 3px solid rgba(14,165,233,.95); box-shadow: 0 0 0 1px rgba(255,255,255,.09) inset, 0 10px 30px rgba(0,0,0,.26), 0 2px 8px rgba(0,0,0,.18); }
header, .header, .navbar { box-shadow: 0 1px 0 rgba(255,255,255,.08), 0 10px 24px rgba(0,0,0,.22); border-bottom: 1px solid rgba(255,255,255,.08); }

/* 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; }
}