/* CSSVariantEngine v3.0 — go-tianbodata.com.cn */
/* Palette: soft blue-teal | Radius: rounded | Shadow: multi-layer soft */
/* Spacing: comfortable | Transition: smooth ease */
/* Section layouts: {"news":"grid-3","features":"grid-4","hero":"overlay","testimonials":"carousel","partners":"grid-4","faq":"single-column","stats":"inline","cta":"split"} */

:root {
    --color-primary: #165DFF;
    --color-primary-dark: #0E42D2;
    --color-accent: #36CBCB;
    --color-surface: #F7F9FC;
    --color-text: #1E293B;
    --rgb-primary: 22, 93, 255;
    --rgb-accent: 54, 203, 203;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --shadow-sm: 0 2px 6px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.02);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.06), 0 2px 8px rgba(0,0,0,0.03);
    --shadow-lg: 0 4px 8px rgba(0,0,0,0.05), 0 20px 40px -10px rgba(0,0,0,0.12);
    --space-section: 4rem;
    --space-card: 1.5rem;
    --space-gap: 1.25rem;
    --transition: 0.45s ease-in-out;
    --heading-weight: 800;
    --body-line-height: 1.75;
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background-color: var(--color-surface); }
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-lg); padding: var(--space-card); transition: var(--transition); background: #ffffff; }
.card:hover { transform: translateY(-4px); box-shadow: 0 8px 16px rgba(0,0,0,0.06), 0 24px 48px -12px rgba(0,0,0,0.15); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark)); color: white; box-shadow: var(--shadow-sm); }
.btn:hover { box-shadow: 0 4px 12px rgba(var(--rgb-primary), 0.3); }
a:not([class]) { color: var(--color-primary); transition: var(--transition); text-decoration-thickness: 2px; text-underline-offset: 3px; }
a:not([class]):hover { color: var(--color-primary-dark); }

/* ========== 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: grid-4 */
.feature-list { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); }

/* hero: overlay */
/* 全屏背景+文字覆盖 */
                .hero { position: relative; min-height: 70vh; display: flex; align-items: center; }
                .hero::before { content: ''; position: absolute; inset: 0; background: linear-gradient(180deg, rgba(247,249,252,0.7), rgba(247,249,252,0.9)); }
                .hero-content { position: relative; z-index: 1; }

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

/* 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 > * { filter: grayscale(30%) opacity(0.7); transition: var(--transition); }
.partner-grid > *:hover { filter: grayscale(0%) opacity(1); }

/* 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: split */
.cta-inner { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 2rem; background: linear-gradient(135deg, #ffffff, #f0f7ff); border-radius: var(--radius-xl); padding: 3rem; box-shadow: var(--shadow-lg); }

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

/* 条件性装饰 */
.card { border-top: 4px solid var(--color-accent); border-left: none; }
header, .header, .navbar { background: rgba(255, 255, 255, 0.85); backdrop-filter: blur(12px); border-bottom: 1px solid rgba(0,0,0,0.05); }

/* 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; }
}