:root {
    --color-primary: #1e40af;
    --color-primary-dark: #1e3a8a;
    --color-accent: #3b82f6;
    --color-surface: #f1f5f9;
    --color-text: #0f172a;
    --rgb-primary: 30,64,175;
    --rgb-accent: 59,130,246;
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 10px;
    --radius-xl: 14px;
    --shadow-sm: 0 1px 4px rgba(30,58,138,.12), 0 1px 2px rgba(59,130,246,.08);
    --shadow-md: 0 4px 10px rgba(30,58,138,.16), 0 2px 6px rgba(59,130,246,.1), 0 0 0 1px rgba(59,130,246,.06);
    --shadow-lg: 0 12px 28px rgba(30,58,138,.2), 0 6px 12px rgba(59,130,246,.12), 0 0 0 1px rgba(59,130,246,.08);
    --space-section: 2rem;
    --space-card: 1rem;
    --space-gap: 0.75rem;
    --transition: 0.5s cubic-bezier(0.22, 0.61, 0.36, 1);
    --heading-weight: 800;
    --body-line-height: 1.65;
}

body { color: var(--color-text); line-height: var(--body-line-height); background: linear-gradient(160deg, #e2e8f0 0%, #f1f5f9 40%, #e0e7ff 100%); }
h1, h2, h3, h4 { font-weight: var(--heading-weight); background: linear-gradient(135deg, #1e3a8a 0%, #3b82f6 100%); -webkit-background-clip: text; background-clip: text; }
section, .section { padding-top: var(--space-section); padding-bottom: var(--space-section); background: linear-gradient(180deg, rgba(241,245,249,.6) 0%, rgba(224,231,255,.3) 100%); }
.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%, #eff6ff 100%); border-image: linear-gradient(135deg, rgba(59,130,246,.4), rgba(30,58,138,.15)) 1; }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); background: linear-gradient(135deg, #3b82f6 0%, #1e40af 100%); box-shadow: 0 2px 8px rgba(59,130,246,.3), 0 1px 3px rgba(30,58,138,.2); }
a:not([class]) { color: var(--color-primary); transition: var(--transition); text-decoration-color: rgba(59,130,246,.4); }

/* ========== 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: left-aligned */
.hero-content { text-align: left; max-width: 600px; background: radial-gradient(ellipse at top left, rgba(59,130,246,.08) 0%, transparent 70%); }

/* testimonials: stacked */
/* 垂直堆叠 */
                .testimonial-list { display: flex; flex-direction: column; gap: var(--space-gap); max-width: 720px; margin: 0 auto; }

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

/* faq: with-sidebar */
/* FAQ 左 + 联系信息右 */
                .faq-wrapper { display: grid; grid-template-columns: 2fr 1fr; gap: 2rem; }

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

/* cta: split */
.cta-inner { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 2rem; background: linear-gradient(120deg, rgba(30,58,138,.06) 0%, rgba(59,130,246,.1) 50%, rgba(99,102,241,.06) 100%); border-radius: var(--radius-lg); box-shadow: inset 0 1px 0 rgba(255,255,255,.6), 0 2px 12px rgba(30,58,138,.08); }

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

/* 条件性装饰 */
.card { border-left: 3px solid var(--color-primary); }

/* 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; }
}