/* CSSVariantEngine v3.0 — gunqiu.net.cn */
/* Palette: gradient-blue-green | Radius: soft-rounded | Shadow: multi-layer harmonious */
/* Spacing: symmetric | Transition: smooth-long */
/* Section layouts: {"news":"featured-top","features":"grid-3","hero":"minimal","testimonials":"stacked","partners":"grid-6","faq":"single-column","stats":"grid-4","cta":"centered"} */

:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1e40af;
    --color-accent: #10b981;
    --color-surface: #f8fafc;
    --color-text: #0f172a;
    --rgb-primary: 37, 99, 235;
    --rgb-accent: 16, 185, 129;
    --radius-sm: 4px;
    --radius-md: 10px;
    --radius-lg: 18px;
    --radius-xl: 28px;
    --shadow-sm: 0 1px 3px 0 rgba(37, 99, 235, 0.1), 0 1px 2px -1px rgba(16, 185, 129, 0.08);
    --shadow-md: 0 4px 6px -1px rgba(37, 99, 235, 0.12), 0 2px 4px -2px rgba(16, 185, 129, 0.08), 0 10px 15px -3px rgba(37, 99, 235, 0.05);
    --shadow-lg: 0 10px 25px -5px rgba(37, 99, 235, 0.15), 0 8px 10px -6px rgba(16, 185, 129, 0.1), 0 20px 25px -5px rgba(37, 99, 235, 0.08);
    --space-section: 4rem;
    --space-card: 1.5rem;
    --space-gap: 1.5rem;
    --transition: 0.5s cubic-bezier(0.25, 0.1, 0.25, 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(135deg, #f0f9ff 0%, #ecfeff 50%, #f0fdf4 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(180deg, #ffffff 0%, #f8fafc 100%);
    border: 1px solid;
    border-image: linear-gradient(135deg, rgba(var(--rgb-primary), 0.2), rgba(var(--rgb-accent), 0.2)) 1;
}
.btn, button[class*="btn"], a[class*="btn"] { 
    border-radius: var(--radius-md); 
    transition: var(--transition); 
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    color: white;
    border: none;
}
a:not([class]) { color: var(--color-primary); transition: var(--transition); }

/* ========== 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: grid-3 */
.feature-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }

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

/* 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-6 */
.partner-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: var(--space-gap); 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: centered */
.cta-inner { text-align: center; max-width: 700px; margin: 0 auto; }

/* 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); 
    background: linear-gradient(180deg, #ffffff 0%, #f0fdfa 100%);
}
a:not([class]):hover { color: var(--color-accent); text-shadow: 0 0 2px rgba(var(--rgb-accent), 0.2); }
.card { border: 1px solid rgba(var(--rgb-primary), .08); }
header, .header, .navbar { 
    box-shadow: 0 2px 12px rgba(37, 99, 235, 0.08), 0 1px 4px rgba(16, 185, 129, 0.04); 
    background: linear-gradient(90deg, #ffffff 0%, #f8fafc 100%);
}

/* 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; }
}