/* CSSVariantEngine v3.0 — world-app-huatihui.com.cn */
/* Palette: indigo-amber | Radius: rounded | Shadow: layered */
/* Spacing: comfortable | Transition: smooth */
/* Section layouts: {"news":"grid-3","features":"horizontal","hero":"split","testimonials":"stacked","partners":"centered","faq":"single-column","stats":"grid-4","cta":"full-bg"} */

:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1e3a8a;
    --color-accent: #f59e0b;
    --color-surface: #f1f5f9;
    --color-text: #1e293b;
    --rgb-primary: 37,99,235;
    --rgb-accent: 245,158,11;
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --shadow-sm: 0 1px 2px rgba(15,23,42,.06), 0 1px 3px rgba(15,23,42,.04);
    --shadow-md: 0 6px 16px -4px rgba(15,23,42,.1), 0 2px 6px -2px rgba(15,23,42,.05);
    --shadow-lg: 0 20px 32px -8px rgba(15,23,42,.16), 0 8px 16px -6px rgba(15,23,42,.08);
    --space-section: 4rem;
    --space-card: 1.5rem;
    --space-gap: 1.5rem;
    --transition: 0.5s cubic-bezier(0.22, 1, 0.36, 1);
    --heading-weight: 600;
    --body-line-height: 1.7;
}

/* 基础覆盖 */
body {
    color: var(--color-text);
    line-height: var(--body-line-height);
    background: linear-gradient(180deg, #f8fafc 0%, var(--color-surface) 100%);
}
h1, h2, h3, h4 {
    font-weight: var(--heading-weight);
    color: #0f172a;
}
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(145deg, #ffffff 0%, #f8fafc 55%, #eef2f7 100%);
}
.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-primary-dark) 100%);
    color: #fff;
    box-shadow: 0 10px 24px -8px rgba(var(--rgb-primary), .6), 0 2px 6px rgba(var(--rgb-primary), .2);
}
a:not([class]) {
    color: var(--color-primary);
    transition: var(--transition);
}

/* ========== 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: horizontal */
/* 水平滚动 */
.feature-list { display: flex; gap: var(--space-gap); overflow-x: auto; scroll-snap-type: x mandatory; }
.feature-list > * { flex: 0 0 300px; scroll-snap-align: start; }

/* hero: split */
/* 左文右图 */
.hero-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; align-items: center; }

/* testimonials: stacked */
/* 垂直堆叠 */
.testimonial-list { display: flex; flex-direction: column; gap: var(--space-gap); max-width: 720px; margin: 0 auto; }

/* partners: centered */
.partner-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 1.75rem; }

/* 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: full-bg */
.cta-section {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 55%, #0f172a 100%);
    color: #fff;
    padding: 4rem 2rem;
    box-shadow: 0 20px 40px -12px rgba(var(--rgb-primary), .35);
}

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

/* 条件性装饰 */
.card:hover, [class*="card"]:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg), 0 0 0 2px rgba(var(--rgb-primary), .12), 0 12px 32px -8px rgba(var(--rgb-primary), .18);
}
a:not([class]):hover {
    color: var(--color-accent);
    text-shadow: 0 0 12px rgba(var(--rgb-accent), .35);
}
header, .header, .navbar {
    background: linear-gradient(180deg, rgba(255,255,255,.92) 0%, rgba(248,250,252,.86) 100%);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    box-shadow: 0 4px 24px -6px rgba(15,23,42,.1), inset 0 -1px 0 rgba(15,23,42,.06);
}

/* 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; }
}