/* CSSVariantEngine v3.0 — topdianjing.org.cn */
/* Palette: gradient-cyan-pink | Radius: soft-rounded | Shadow: multi-layer gradient | Spacing: asymmetric-mixed | Transition: long-smooth */
/* Section layouts: {"news":"featured-top","features":"centered","hero":"overlay","testimonials":"grid-3","partners":"grid-4","faq":"with-sidebar","stats":"grid-4","cta":"split"} */

:root {
    --color-primary: #06b6d4;
    --color-primary-dark: #0891b2;
    --color-accent: #ec4899;
    --color-surface: #f8fafc;
    --color-text: #0f172a;
    --rgb-primary: 6, 182, 212;
    --rgb-accent: 236, 72, 153;
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --shadow-sm: 0 2px 4px rgba(6, 182, 212, 0.1), 0 1px 2px rgba(236, 72, 153, 0.08);
    --shadow-md: 0 6px 12px rgba(6, 182, 212, 0.15), 0 3px 6px rgba(236, 72, 153, 0.1);
    --shadow-lg: 0 12px 24px rgba(6, 182, 212, 0.2), 0 6px 12px rgba(236, 72, 153, 0.12), 0 2px 4px rgba(0, 0, 0, 0.05);
    --space-section: 5rem;
    --space-card: 2rem;
    --space-gap: 1.5rem;
    --transition: 0.55s cubic-bezier(0.22, 0.61, 0.36, 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(180deg, #f0f9ff 0%, #fdf2f8 100%);
}
h1, h2, h3, h4 { font-weight: var(--heading-weight); }
section, .section { 
    padding-top: var(--space-section); 
    padding-bottom: var(--space-section);
    background: linear-gradient(135deg, transparent 0%, rgba(var(--rgb-primary), 0.05) 100%);
}
.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%, #f0f9ff 100%);
    border: 2px solid transparent;
    border-image: linear-gradient(90deg, var(--color-primary), var(--color-accent), var(--color-primary-dark)) 1 stretch;
}
.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);
    text-decoration-thickness: 2px;
}

/* ========== 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; background: linear-gradient(90deg, rgba(6,182,212,0.1) 0%, rgba(236,72,153,0.1) 100%); }

/* features: centered */
/* 居中大卡片 */
.feature-list { display: flex; flex-direction: column; align-items: center; gap: calc(var(--space-gap) * 2); max-width: 720px; margin: 0 auto; }
.feature-list > * { background: linear-gradient(180deg, #fdf2f8 0%, #ffffff 100%); }

/* hero: overlay */
/* 全屏背景+文字覆盖 */
.hero { 
    position: relative; 
    min-height: 70vh; 
    display: flex; 
    align-items: center;
    background: linear-gradient(120deg, rgba(6, 182, 212, 0.8) 0%, rgba(236, 72, 153, 0.8) 100%), radial-gradient(circle at 20% 50%, #0891b2 0%, transparent 50%);
}
.hero-content { position: relative; z-index: 1; color: white; text-shadow: 0 2px 8px rgba(0,0,0,0.2); }

/* testimonials: grid-3 */
.testimonial-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }
.testimonial-list > * { background: linear-gradient(160deg, #f0fdfa 0%, #ccfbf1 100%); }

/* partners: grid-4 */
.partner-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: calc(var(--space-gap) * 1.5); align-items: center; }
.partner-grid > * { background: linear-gradient(45deg, #f1f5f9 0%, #e0f2fe 100%); }

/* faq: with-sidebar */
/* FAQ 左 + 联系信息右 */
.faq-wrapper { display: grid; grid-template-columns: 2fr 1fr; gap: 2rem; }
.faq-wrapper > *:last-child { background: linear-gradient(135deg, rgba(236,72,153,0.15) 0%, rgba(6,182,212,0.15) 100%); }

/* stats: grid-4 */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); text-align: center; }
.stats-grid > * { background: linear-gradient(180deg, #e0f2fe 0%, #fbcfe8 100%); border-radius: var(--radius-xl); }

/* cta: split */
.cta-inner { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 2rem; }
.cta-inner { background: linear-gradient(90deg, var(--color-primary-dark) 0%, var(--color-accent) 100%); padding: 3rem; border-radius: var(--radius-xl); color: white; }

/* 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);
    filter: brightness(1.03);
}
a:not([class]):hover { color: var(--color-accent); }
.card { border: 2px solid rgba(var(--rgb-primary), .12); }

/* 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; }
}