:root {
    --color-primary: #1e3a8a;
    --color-primary-dark: #172554;
    --color-accent: #3b82f6;
    --color-surface: #f0f9ff;
    --color-text: #0c1a3a;
    --rgb-primary: 30,58,138;
    --rgb-accent: 59,130,246;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --shadow-sm: 0 1px 3px rgba(30,58,138,.06), 0 1px 2px rgba(30,58,138,.04);
    --shadow-md: 0 4px 6px -1px rgba(30,58,138,.07), 0 2px 4px -1px rgba(30,58,138,.06);
    --shadow-lg: 0 10px 15px -3px rgba(30,58,138,.08), 0 4px 6px -2px rgba(30,58,138,.05);
    --space-section: 2.4rem;
    --space-card: 1.2rem;
    --space-gap: 0.9rem;
    --transition: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    --heading-weight: 700;
    --body-line-height: 1.75;
}

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: var(--shadow-md); padding: var(--space-card); transition: var(--transition); background: linear-gradient(145deg, #ffffff, #f0f9ff); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); background: linear-gradient(135deg, var(--color-primary), var(--color-accent)); box-shadow: 0 2px 4px rgba(30,58,138,.1), 0 1px 2px rgba(30,58,138,.06); }
a:not([class]) { color: var(--color-primary); transition: var(--transition); text-decoration-color: rgba(30,58,138,.3); }

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

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

/* features: centered */
.feature-list { display: flex; flex-direction: column; align-items: center; gap: calc(var(--space-gap) * 2); max-width: 720px; margin: 0 auto; }

/* hero: overlay */
.hero { position: relative; min-height: 70vh; display: flex; align-items: center; background: linear-gradient(135deg, #1e3a8a 0%, #3b82f6 50%, #60a5fa 100%) !important; }
.hero-content { position: relative; z-index: 1; }

/* testimonials: carousel */
.testimonial-list { display: flex; overflow: hidden; } 
.testimonial-list > * { flex: 0 0 100%; }

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

/* faq: two-column */
.faq-list { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-gap); }

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

/* cta: card-style */
.cta-inner { background: linear-gradient(145deg, #ffffff, #f0f9ff); border-radius: var(--radius-xl); padding: 3rem; text-align: center; box-shadow: var(--shadow-lg), 0 0 0 1px rgba(59,130,246,.1); }

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

/* 条件性装饰 */
.hero, [class*="hero"], section:first-of-type { background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 40%, #60a5fa 100%); }
header, .header, .navbar { background: transparent; }

/* 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: 2.4rem; --space-card: 1.2rem; --space-gap: 0.9rem; }
    .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; }
}