/* CSSVariantEngine v3.0 — zh-u8.com */
/* Palette: deep-slate sidebar | Radius: airy | Shadow: pillowy */
/* Spacing: airy-rhythm | Transition: smooth-elastic */
/* Section layouts: {"news":"grid-4","features":"grid-4","hero":"minimal","testimonials":"carousel","partners":"grid-4","faq":"single-column","stats":"grid-4","cta":"split"} */

:root {
    --color-primary: #252e3a;
    --color-primary-dark: #161d26;
    --color-accent: #5b9dd9;
    --color-surface: #f4f7fb;
    --color-text: #1c2430;
    --rgb-primary: 37,46,58;
    --rgb-accent: 91,157,217;
    --radius-sm: 10px;
    --radius-md: 16px;
    --radius-lg: 22px;
    --radius-xl: 28px;
    --shadow-sm: 0 2px 10px rgba(37,46,58,.08), 0 1px 3px rgba(37,46,58,.05);
    --shadow-md: 0 8px 24px rgba(37,46,58,.09), 0 3px 8px rgba(91,157,217,.06);
    --shadow-lg: 0 16px 44px rgba(37,46,58,.12), 0 6px 16px rgba(91,157,217,.08);
    --space-section: 4.5rem;
    --space-card: 1.75rem;
    --space-gap: 1.5rem;
    --transition: 0.55s cubic-bezier(0.22, 1.2, 0.36, 1);
    --heading-weight: 800;
    --body-line-height: 1.65;
}

/* 基础覆盖 */
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); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); }
a:not([class]) { color: var(--color-accent); transition: var(--transition); }

/* ========== 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: minimal */
.hero { padding: 2rem 0; } .hero-content { max-width: 560px; }

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

/* partners: grid-4 */
.partner-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: calc(var(--space-gap) * 1.5); align-items: center; }

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

/* Page Layout: narrow-centered */
/* 窄版居中 */
            .page-main { max-width: 860px; margin: 0 auto; }

/* 条件性装饰 */
.card:hover, [class*="card"]:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
a:not([class]):hover { color: var(--color-primary); }
.hero, [class*="hero"], section:first-of-type { background: linear-gradient(145deg, #252e3a 0%, #1a212b 45%, #161d26 100%); }
.card { border-left: 3px solid var(--color-accent); }
header, .header, .navbar { box-shadow: 0 4px 20px rgba(22,29,38,.10), 0 1px 4px rgba(22,29,38,.06); }

/* 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: 1.15rem; --space-gap: 0.85rem; }
    .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; }
}