/* CSSVariantEngine v3.0 — zha-qiuyou.com */
/* Palette: slate-blue | Radius: pillowy | Shadow: soft-multi */
/* Spacing: spacious | Transition: smooth */
/* Section layouts: {"news":"featured-top","features":"centered","hero":"centered","testimonials":"stacked","partners":"grid-6","faq":"single-column","stats":"inline","cta":"split"} */

:root {
    --color-primary: #3b82f6;
    --color-primary-dark: #1e40af;
    --color-accent: #60a5fa;
    --color-surface: #ffffff;
    --color-text: #e2e8f0;
    --rgb-primary: 59,130,246;
    --rgb-accent: 96,165,250;
    --radius-sm: 12px;
    --radius-md: 20px;
    --radius-lg: 28px;
    --radius-xl: 36px;
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.08), 0 1px 3px rgba(0,0,0,0.06);
    --shadow-md: 0 8px 24px rgba(0,0,0,0.12), 0 2px 8px rgba(0,0,0,0.08);
    --shadow-lg: 0 16px 40px rgba(0,0,0,0.16), 0 4px 12px rgba(0,0,0,0.08);
    --space-section: 5rem;
    --space-card: 2rem;
    --space-gap: 1.5rem;
    --transition: 0.3s 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: #1e293b;
}

h1, h2, h3, h4 { font-weight: var(--heading-weight); color: #f8fafc; }

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: var(--color-surface);
    border: 1px solid rgba(15,23,42,0.08);
    color: #0f172a;
}

.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    background: var(--color-primary);
    color: #ffffff;
    border: 1px solid transparent;
}

.btn:hover, button[class*="btn"]:hover, a[class*="btn"]:hover {
    background: var(--color-primary-dark);
    box-shadow: var(--shadow-sm);
    transform: translateY(-1px);
}

a:not([class]) {
    color: var(--color-primary);
    transition: var(--transition);
}

a:not([class]):hover { color: var(--color-accent); }

/* ========== 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: 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; }

/* hero: centered */
.hero-content { text-align: center; max-width: 800px; margin: 0 auto; }

/* 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: 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; }

/* Page Layout: wide */
/* 超宽 */
.page-main { max-width: 1400px; margin: 0 auto; }

/* 条件性装饰 */
.card { border-color: rgba(15,23,42,0.08); }
.card:hover {
    box-shadow: var(--shadow-lg);
    border-color: rgba(59,130,246,0.25);
    transform: translateY(-2px);
}

header, .header, .navbar {
    background: rgba(15,23,42,0.75);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(148,163,184,0.1);
}

/* 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; }
}