/* CSSVariantEngine v3.0 — go-btiyuguanwang.com.cn */
/* Palette: deep-teal-orange | Radius: tiny | Shadow: soft-subtle */
/* Spacing: tight | Transition: snappy */
/* Section layouts: {"news":"featured-top","features":"grid-3","hero":"split","testimonials":"stacked","partners":"grid-4","faq":"two-column","stats":"grid-4","cta":"full-bg"} */

:root {
    --color-primary: #0d9488;
    --color-primary-dark: #0f766e;
    --color-accent: #f97316;
    --color-surface: #f8fafc;
    --color-text: #0f172a;
    --rgb-primary: 13, 148, 136;
    --rgb-accent: 249, 115, 22;
    --radius-sm: 2px;
    --radius-md: 4px;
    --radius-lg: 5px;
    --radius-xl: 6px;
    --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.15);
    --shadow-md: 0 2px 6px rgba(15, 23, 42, 0.1);
    --shadow-lg: 0 3px 10px rgba(15, 23, 42, 0.08);
    --space-section: 1.6rem;
    --space-card: 0.9rem;
    --space-gap: 0.65rem;
    --transition: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --heading-weight: 700;
    --body-line-height: 1.65;
}

/* 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-sm); padding: var(--space-card); transition: var(--transition); border: 1px solid rgba(var(--rgb-primary), 0.25); background-color: #ffffff; }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); border: 1px solid rgba(var(--rgb-primary), 0.3); }
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; }
.news-section { background-color: #ecfdf5; border-bottom: 2px solid var(--color-primary); }

/* features: grid-3 */
.feature-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }
.features-section { background-color: #fff7ed; border-bottom: 2px solid var(--color-accent); }

/* hero: split */
/* 左文右图 */
.hero-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; align-items: center; }
.hero-section { background-color: #f0f9ff; border-bottom: 2px solid #0ea5e9; }

/* testimonials: stacked */
/* 垂直堆叠 */
.testimonial-list { display: flex; flex-direction: column; gap: var(--space-gap); max-width: 720px; margin: 0 auto; }
.testimonials-section { background-color: #fef3c7; border-bottom: 2px solid #f59e0b; }

/* partners: grid-4 */
.partner-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: calc(var(--space-gap) * 1.5); align-items: center; }
.partners-section { background-color: #f0fdf4; border-bottom: 2px solid #22c55e; }

/* faq: two-column */
.faq-list { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-gap); }
.faq-section { background-color: #faf5ff; border-bottom: 2px solid #a855f7; }

/* stats: grid-4 */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); text-align: center; }
.stats-section { background-color: #fef2f2; border-bottom: 2px solid #ef4444; }

/* cta: full-bg */
.cta-section { background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%); color: #fff; padding: 4rem 2rem; border-top: 3px solid var(--color-accent); }

/* Page Layout: narrow-centered */
/* 窄版居中 */
.page-main { max-width: 860px; margin: 0 auto; }

/* 条件性装饰 */
a:not([class]):hover { color: var(--color-accent); }
header, .header, .navbar { background: #ffffff; border-bottom: 1px solid rgba(var(--rgb-primary), 0.35); }

/* 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: 1.5rem; --space-card: 0.85rem; --space-gap: 0.6rem; }
    .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; }
}