/* CSSVariantEngine v3.0 — btiyuzhibo.com.cn */
/* Palette: navy-mustard | Radius: sharp | Shadow: hard-offset */
/* Spacing: generous | Transition: snappy */
/* Section layouts: {"news":"featured-top","features":"horizontal","hero":"centered","testimonials":"carousel","partners":"centered","faq":"single-column","stats":"inline","cta":"full-bg"} */

:root {
    --color-primary: #1a365d;
    --color-primary-dark: #0f213d;
    --color-accent: #f59e0b;
    --color-surface: #fffbeb;
    --color-text: #1e293b;
    --rgb-primary: 26,54,93;
    --rgb-accent: 245,158,11;
    --radius-sm: 2px;
    --radius-md: 3px;
    --radius-lg: 4px;
    --radius-xl: 4px;
    --shadow-sm: 2px 2px 0px rgba(26,54,93,0.9);
    --shadow-md: 4px 4px 0px rgba(26,54,93,0.95);
    --shadow-lg: 6px 6px 0px rgba(15,33,61,1);
    --space-section: 5rem;
    --space-card: 1.5rem;
    --space-gap: 1.25rem;
    --transition: 0.15s ease-out;
    --heading-weight: 600;
    --body-line-height: 1.75;
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: #ffffff; }
h1, h2, h3, h4 { font-weight: var(--heading-weight); }
section, .section { padding-top: var(--space-section); padding-bottom: var(--space-section); }
section:nth-child(even) { background: var(--color-surface); }
section:nth-child(odd):not(.hero):not(.cta-section) { background: #ffffff; }
.card, [class*="card"] { border-radius: var(--radius-lg); box-shadow: var(--shadow-md); padding: var(--space-card); transition: var(--transition); border: 3px solid var(--color-primary); background: #ffffff; }
.card:hover { transform: translate(-2px, -2px); box-shadow: 6px 6px 0px var(--color-primary); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); border: 3px solid var(--color-primary); background: var(--color-accent); color: var(--color-primary); font-weight: 600; }
.btn:hover { transform: translate(-2px, -2px); box-shadow: 4px 4px 0px var(--color-primary); }
a:not([class]) { color: var(--color-accent); transition: var(--transition); text-underline-offset: 3px; }
a:not([class]):hover { color: var(--color-primary); }

/* ========== 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; }

/* features: horizontal */
/* 水平滚动 */
                .feature-list { display: flex; gap: var(--space-gap); overflow-x: auto; scroll-snap-type: x mandatory; }
                .feature-list > * { flex: 0 0 300px; scroll-snap-align: start; }

/* hero: centered */
.hero-content { text-align: center; max-width: 800px; margin: 0 auto; }

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

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

/* cta: full-bg */
.cta-section { background: var(--color-accent); color: var(--color-primary-dark); padding: 4rem 2rem; }

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

/* 条件性装饰 */
.hero, [class*="hero"], section:first-of-type { background: linear-gradient(180deg, #1a365d, #0f213d); color: #ffffff; }
.card { border: 3px solid var(--color-primary); }
header, .header, .navbar { background: #ffffff; border-bottom: 3px solid var(--color-primary); backdrop-filter: none; }

/* 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; }
}