:/* CSSVariantEngine v3.0 — card-mosaic variant */
:root {
    --color-primary: #7c3aed;
    --color-primary-dark: #4c1d95;
    --color-accent: #f59e0b;
    --color-surface: #f5f3ff;
    --color-text: #1e1b4b;
    --rgb-primary: 124,58,237;
    --rgb-accent: 245,158,11;
    --radius-sm: 10px;
    --radius-md: 16px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --shadow-sm: 0 2px 12px rgba(124,58,237,0.08), 0 0 0 1px rgba(124,58,237,0.04);
    --shadow-md: 0 8px 24px rgba(124,58,237,0.15), 0 0 24px rgba(124,58,237,0.08);
    --shadow-lg: 0 16px 40px rgba(124,58,237,0.2), 0 0 32px rgba(124,58,237,0.12);
    --space-section: 4rem;
    --space-card: 1.5rem;
    --space-gap: 1.25rem;
    --transition: 0.45s cubic-bezier(0.22, 1, 0.36, 1);
    --heading-weight: 800;
    --body-line-height: 1.7;
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: linear-gradient(160deg, #faf5ff 0%, #ede9fe 50%, #f5f3ff 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); background: linear-gradient(145deg, #ffffff, #f5f3ff); border: 1px solid rgba(124,58,237,0.1); }
.card:hover, [class*="card"]:hover { box-shadow: 0 12px 32px rgba(124,58,237,0.25), 0 0 32px rgba(124,58,237,0.15); transform: translateY(-2px); border-color: rgba(245,158,11,0.3); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); background: linear-gradient(135deg, #7c3aed, #a78bfa); color: #fff; box-shadow: 0 4px 16px rgba(124,58,237,0.35); }
.btn:hover, button[class*="btn"]:hover, a[class*="btn"]:hover { box-shadow: 0 8px 24px rgba(124,58,237,0.5), 0 0 24px rgba(124,58,237,0.3); background: linear-gradient(135deg, #6d28d9, #8b5cf6); }
.btn-secondary, button[class*="btn-secondary"], a[class*="btn-secondary"] { background: linear-gradient(135deg, #f59e0b, #fbbf24); box-shadow: 0 4px 16px rgba(245,158,11,0.35); }
.btn-secondary:hover { box-shadow: 0 8px 24px rgba(245,158,11,0.5), 0 0 24px rgba(245,158,11,0.3); }
a:not([class]) { color: var(--color-primary); transition: var(--transition); text-decoration-color: rgba(124,58,237,0.3); }

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

/* news: featured-top */
/* 首篇横跨全宽 */
.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }
.news-grid > *:first-child { grid-column: span 3; }
.news-grid > *:first-child { box-shadow: 0 12px 32px rgba(124,58,237,0.2), 0 0 32px rgba(124,58,237,0.1); background: linear-gradient(145deg, #ffffff, #f0e6ff); }
.news-grid > *:nth-child(2) { box-shadow: 0 8px 24px rgba(245,158,11,0.15), 0 0 24px rgba(245,158,11,0.08); }
.news-grid > *:nth-child(3) { box-shadow: 0 8px 24px rgba(16,185,129,0.15), 0 0 24px rgba(16,185,129,0.08); }
.news-grid > *:nth-child(4) { box-shadow: 0 8px 24px rgba(239,68,68,0.15), 0 0 24px rgba(239,68,68,0.08); }

/* features: grid-3 */
.feature-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }
.feature-list > *:nth-child(1) { border-top: 4px solid #7c3aed; }
.feature-list > *:nth-child(2) { border-top: 4px solid #f59e0b; }
.feature-list > *:nth-child(3) { border-top: 4px solid #10b981; }

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

/* testimonials: grid-3 */
.testimonial-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }
.testimonial-list > * { background: linear-gradient(145deg, #ffffff, #fdf4ff); border-left: 4px solid #d946ef; }

/* partners: centered */
.partner-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 2rem; }
.partner-grid > * { background: #ffffff; box-shadow: 0 4px 16px rgba(124,58,237,0.1), 0 0 16px rgba(124,58,237,0.05); transition: var(--transition); }
.partner-grid > *:hover { box-shadow: 0 8px 24px rgba(124,58,237,0.2), 0 0 24px rgba(124,58,237,0.1); }

/* faq: single-column */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-list > * { border-left: 4px solid #f59e0b; background: linear-gradient(145deg, #ffffff, #fffbeb); }

/* stats: inline */
/* 水平排列 */
.stats-grid { display: flex; justify-content: center; gap: 3rem; }
.stats-grid > * { background: linear-gradient(145deg, #7c3aed, #6d28d9); color: #fff; box-shadow: 0 8px 24px rgba(124,58,237,0.3), 0 0 24px rgba(124,58,237,0.15); }
.stats-grid > *:nth-child(2) { background: linear-gradient(145deg, #f59e0b, #d97706); box-shadow: 0 8px 24px rgba(245,158,11,0.3), 0 0 24px rgba(245,158,11,0.15); }
.stats-grid > *:nth-child(3) { background: linear-gradient(145deg, #10b981, #059669); box-shadow: 0 8px 24px rgba(16,185,129,0.3), 0 0 24px rgba(16,185,129,0.15); }

/* cta: split */
.cta-inner { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 2rem; }

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

/* 条件性装饰 */
a:not([class]):hover { color: var(--color-accent); text-decoration-color: rgba(245,158,11,0.6); }
.hero, [class*="hero"], section:first-of-type { background: linear-gradient(135deg, #4c1d95, #7c3aed, #a78bfa); box-shadow: inset 0 -4px 24px rgba(124,58,237,0.2); }
header, .header, .navbar { background: rgba(255,255,255,0.9); backdrop-filter: blur(12px); box-shadow: 0 4px 20px rgba(124,58,237,0.1), 0 0 16px rgba(124,58,237,0.05); border-bottom: 1px solid rgba(124,58,237,0.08); }

/* 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; }
}