/* CSSVariantEngine v3.0 — go-btiyuwang.com.cn */
/* Palette: deep slate cyan | Radius: soft rounded | Shadow: multi-layer gradient */
/* Spacing: balanced | Transition: smooth extended */
/* Section layouts: {"news":"list-view","features":"grid-2","hero":"left-aligned","testimonials":"stacked","partners":"grid-4","faq":"single-column","stats":"grid-4","cta":"card-style"} */

:root {
    --color-primary: #1e40af;
    --color-primary-dark: #1e3a8a;
    --color-accent: #06b6d4;
    --color-surface: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    --color-text: #1e293b;
    --rgb-primary: 30, 64, 175;
    --rgb-accent: 6, 182, 212;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --shadow-sm: 0 2px 8px rgba(37, 46, 58, 0.12), 0 1px 3px rgba(37, 46, 58, 0.08);
    --shadow-md: 0 8px 20px rgba(37, 46, 58, 0.15), 0 3px 6px rgba(37, 46, 58, 0.1), 0 1px 2px rgba(37, 46, 58, 0.06);
    --shadow-lg: 0 16px 40px rgba(37, 46, 58, 0.2), 0 6px 12px rgba(37, 46, 58, 0.12), 0 2px 4px rgba(37, 46, 58, 0.08);
    --space-section: 5rem;
    --space-card: 2rem;
    --space-gap: 1.5rem;
    --transition: 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --heading-weight: 600;
    --body-line-height: 1.75;
    accent-color: var(--color-accent);
    caret-color: var(--color-primary);
}

/* 基础覆盖 */
body { 
    color: var(--color-text); 
    line-height: var(--body-line-height); 
    background: linear-gradient(180deg, #f1f5f9 0%, #cbd5e1 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 0%, #f8fafc 100%);
    border-image: linear-gradient(180deg, #252e3a 0%, #06b6d4 100%) 1;
}
.btn, button[class*="btn"], a[class*="btn"] { 
    border-radius: var(--radius-md); 
    transition: var(--transition); 
    background: linear-gradient(90deg, #1e40af 0%, #06b6d4 100%);
    color: white;
    border: 1px solid transparent;
}
a:not([class]) { color: var(--color-primary); transition: var(--transition); }

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

/* news: list-view */
/* 列表模式 (图左文右) */
                .news-grid { display: flex; flex-direction: column; gap: var(--space-gap); }
                .news-grid .card { display: grid; grid-template-columns: 280px 1fr; }

/* features: grid-2 */
.feature-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: calc(var(--space-gap) * 1.5); }

/* hero: left-aligned */
.hero-content { text-align: left; max-width: 600px; }

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

/* 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: card-style */
.cta-inner { 
    background: radial-gradient(circle at top left, #252e3a 0%, #334155 45%, #1e293b 100%); 
    border-radius: var(--radius-xl); 
    padding: 3rem; 
    text-align: center; 
    color: white;
    box-shadow: 0 12px 36px rgba(37, 46, 58, 0.3), 0 4px 12px rgba(6, 182, 212, 0.2);
}

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

/* 条件性装饰 */
.card:hover, [class*="card"]:hover { 
    transform: translateY(-6px); 
    box-shadow: 0 22px 50px rgba(37, 46, 58, 0.25), 0 8px 18px rgba(6, 182, 212, 0.15); 
}
.card { 
    border-left: 3px solid; 
    border-image: linear-gradient(180deg, #252e3a 0%, #06b6d4 100%) 1; 
}
header, .header, .navbar { 
    box-shadow: 0 4px 16px rgba(37, 46, 58, 0.18), 0 2px 6px rgba(6, 182, 212, 0.1); 
    background: linear-gradient(90deg, #252e3a 0%, #334155 100%);
    color: white;
}

/* 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; }
}