/* CSSVariantEngine v3.0 — ch4-bandaotiyu.com.cn */
/* Palette: slate-gold | Radius: rounded | Shadow: layered */
/* Spacing: balanced | Transition: smooth */
/* Section layouts: {"news":"grid-3","features":"horizontal","hero":"minimal","testimonials":"masonry","partners":"grid-6","faq":"single-column","stats":"inline","cta":"card-style"} */

:root {
    --color-primary: #252e3a;
    --color-primary-dark: #1b222c;
    --color-accent: #fbbf24;
    --color-accent-dark: #d97706;
    --color-surface: #f8fafc;
    --color-text: #111827;
    --rgb-primary: 37,46,58;
    --rgb-accent: 251,191,36;
    --radius-sm: 12px;
    --radius-md: 22px;
    --radius-lg: 32px;
    --radius-xl: 48px;
    --shadow-sm: 0 4px 10px -4px rgba(15,23,42,0.08), 0 2px 6px -2px rgba(15,23,42,0.05);
    --shadow-md: 0 12px 24px -8px rgba(15,23,42,0.14), 0 4px 10px -6px rgba(15,23,42,0.08), inset 0 1px 0 rgba(255,255,255,0.6);
    --shadow-lg: 0 24px 48px -16px rgba(15,23,42,0.25), 0 12px 24px -8px rgba(15,23,42,0.12), 0 2px 8px rgba(251,191,36,0.08);
    --space-section: 3rem;
    --space-card: 1.25rem;
    --space-gap: 1rem;
    --transition: 0.5s 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(160deg, #f8fafc 0%, #eef2f7 45%, #e2e8f0 100%); background-attachment: fixed; }
h1, h2, h3, h4 { font-weight: var(--heading-weight); }
section, .section { padding-top: var(--space-section); padding-bottom: var(--space-section); background: radial-gradient(1000px 240px at 50% 0%, rgba(37,46,58,0.03), transparent 70%); }
.card, [class*="card"] { border-radius: var(--radius-lg); box-shadow: var(--shadow-md); padding: var(--space-card); transition: var(--transition); background: linear-gradient(145deg, rgba(255,255,255,0.98) 0%, rgba(248,250,252,0.92) 100%); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); background: linear-gradient(135deg, #fcd34d 0%, #f59e0b 45%, #d97706 100%); color: #1b222c; box-shadow: 0 8px 16px -6px rgba(217,119,6,0.35), inset 0 1px 0 rgba(255,255,255,0.35); }
a:not([class]) { color: var(--color-accent-dark); transition: var(--transition); text-decoration-color: rgba(217,119,6,0.35); text-underline-offset: 3px; }

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

/* news: grid-3 */
/* 三列等宽网格 */
.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }

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

/* testimonials: masonry */
.testimonial-list { column-count: 2; column-gap: var(--space-gap); }
.testimonial-list > * { break-inside: avoid; margin-bottom: var(--space-gap); }

/* partners: grid-6 */
.partner-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: var(--space-gap); align-items: center; background: radial-gradient(600px 120px at 50% 0%, rgba(251,191,36,0.08), transparent 70%); }

/* 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: card-style */
.cta-inner { background: linear-gradient(135deg, #1b222c 0%, #252e3a 45%, #2b3645 70%, #111827 100%); border-radius: var(--radius-xl); padding: 3rem; text-align: center; color: #f8fafc; box-shadow: var(--shadow-lg); }

/* Page Layout: wide */
/* 超宽 */
.page-main { max-width: 1400px; margin: 0 auto; }

/* 条件性装饰 */
.hero, [class*="hero"], section:first-of-type { color: #f8fafc; background: radial-gradient(1200px 400px at 20% 0%, rgba(251,191,36,0.12), transparent 60%), radial-gradient(900px 320px at 85% 10%, rgba(56,189,248,0.10), transparent 45%), linear-gradient(135deg, #111827 0%, #1b222c 35%, #252e3a 70%, #2d3748 100%); }
.card { border-left: 3px solid var(--color-primary); border-image: linear-gradient(180deg, var(--color-accent) 0%, var(--color-primary) 40%, var(--color-accent) 100%) 1; }
header, .header, .navbar { box-shadow: 0 12px 24px -16px rgba(15,23,42,0.18), 0 4px 12px -6px rgba(15,23,42,0.08), inset 0 1px 0 rgba(255,255,255,0.6); background: linear-gradient(180deg, rgba(248,250,252,0.92) 0%, rgba(241,245,249,0.78) 100%); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); }

/* 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; }
}