:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1e3a8a;
    --color-accent: #60a5fa;
    --color-surface: #f8fafc;
    --color-text: #0f172a;
    --rgb-primary: 37,99,235;
    --rgb-accent: 96,165,250;
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 18px;
    --radius-xl: 24px;
    --shadow-sm: 0 2px 8px rgba(37,99,235,0.12), 0 0 16px rgba(37,99,235,0.06);
    --shadow-md: 0 6px 20px rgba(37,99,235,0.15), 0 0 24px rgba(37,99,235,0.08);
    --shadow-lg: 0 12px 32px rgba(37,99,235,0.2), 0 0 32px rgba(37,99,235,0.12);
    --space-section: 5rem;
    --space-card: 2rem;
    --space-gap: 1.5rem;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --heading-weight: 600;
    --body-line-height: 1.75;
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%); }
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); border: 1px solid rgba(37,99,235,0.1); backdrop-filter: blur(8px); background: rgba(255,255,255,0.9); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); box-shadow: 0 0 16px rgba(37,99,235,0.15); }
a:not([class]) { color: var(--color-primary); transition: var(--transition); text-shadow: 0 0 8px rgba(37,99,235,0.2); }

/* ========== 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: grid-4 */
.feature-list { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); }

/* hero: overlay */
/* 全屏背景+文字覆盖 */
.hero { position: relative; min-height: 70vh; display: flex; align-items: center; }
.hero-content { position: relative; z-index: 1; }

/* testimonials: grid-3 */
.testimonial-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 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: card-style */
.cta-inner { background: var(--color-surface); border-radius: var(--radius-xl); padding: 3rem; text-align: center; box-shadow: 0 0 32px rgba(37,99,235,0.2); border: 1px solid rgba(37,99,235,0.1); }

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

/* 条件性装饰 */
.card:hover, [class*="card"]:hover { transform: translateY(-4px); box-shadow: 0 0 32px rgba(37,99,235,0.25), 0 12px 32px rgba(37,99,235,0.15); border-color: rgba(37,99,235,0.2); }
a:not([class]):hover { color: var(--color-accent); text-shadow: 0 0 12px rgba(96,165,250,0.4); }
.hero, [class*="hero"], section:first-of-type { background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 50%, #3b82f6 100%); }
.card { border: 1px solid rgba(var(--rgb-primary), .12); }
header, .header, .navbar { box-shadow: 0 2px 16px rgba(37,99,235,0.1), 0 0 24px rgba(37,99,235,0.06); backdrop-filter: blur(8px); }

/* 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; }
}