/* CSSVariantEngine v3.0 — signin-longhudou.com.cn */
/* Palette: indigo-teal | Radius: rounded | Shadow: soft-layers */
/* Spacing: spacious | Transition: smooth */
/* Section layouts: {"news":"featured-left","features":"grid-4","hero":"minimal","testimonials":"grid-3","partners":"centered","faq":"two-column","stats":"inline","cta":"split"} */

:root {
    --color-primary: #4f46e5;
    --color-primary-dark: #312e81;
    --color-accent: #0f766e;
    --color-surface: #f6f8ff;
    --color-text: #182033;
    --rgb-primary: 79,70,229;
    --rgb-accent: 15,118,110;
    --radius-sm: 10px;
    --radius-md: 14px;
    --radius-lg: 22px;
    --radius-xl: 28px;
    --shadow-sm: 0 2px 6px rgba(15,23,42,0.06), 0 1px 2px rgba(79,70,229,0.05);
    --shadow-md: 0 6px 16px rgba(15,23,42,0.08), 0 16px 32px rgba(79,70,229,0.10);
    --shadow-lg: 0 12px 26px rgba(15,118,110,0.14), 0 30px 60px -18px rgba(15,23,42,0.22);
    --space-section: 5rem;
    --space-card: 2rem;
    --space-gap: 1.5rem;
    --transition: 0.35s cubic-bezier(0.22, 1, 0.36, 1);
    --heading-weight: 800;
    --body-line-height: 1.7;
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: radial-gradient(circle at top, #eef2ff 0%, #f7f9ff 42%, #edf8f6 100%); }
h1, h2, h3, h4 { font-weight: var(--heading-weight); text-shadow: 0 1px 0 rgba(255,255,255,0.72), 0 10px 24px rgba(24,32,51,0.10); }
section, .section { padding-top: var(--space-section); padding-bottom: var(--space-section); }
.card, [class*="card"] { border-radius: var(--radius-xl); box-shadow: var(--shadow-md); padding: var(--space-card); transition: var(--transition); background: linear-gradient(180deg, rgba(255,255,255,0.94), rgba(243,246,255,0.86)); border-left-color: rgba(79,70,229,0.20); border-color: rgba(79,70,229,0.14); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); background: linear-gradient(135deg, #4f46e5 0%, #3730a3 100%); color: rgba(248,250,252,0.98); box-shadow: var(--shadow-sm); }
a:not([class]) { color: var(--color-primary); transition: var(--transition); }

/* ========== Section Layout Variants ========== */

/* news: featured-left */
/* 左大右小 (1大+2小) */
                .news-grid { display: grid; grid-template-columns: 2fr 1fr; grid-template-rows: auto auto; gap: var(--space-gap); }
                .news-grid > *:first-child { grid-row: span 2; }

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

/* hero: minimal */
.hero { padding: 2rem 0; } .hero-content { max-width: 560px; }

/* testimonials: grid-3 */
.testimonial-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }

/* partners: centered */
.partner-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 2rem; }

/* faq: two-column */
.faq-list { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-gap); }

/* 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:hover, [class*="card"]:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
a:not([class]):hover { color: var(--color-accent); }
.hero, [class*="hero"], section:first-of-type { background: linear-gradient(135deg, #312e81 0%, #4f46e5 52%, #0f766e 100%); }
.card { border-left: 3px solid var(--color-primary); }
header, .header, .navbar { background: linear-gradient(180deg, rgba(247,249,255,0.88) 0%, rgba(236,242,255,0.72) 100%); backdrop-filter: blur(14px) saturate(1.2); filter: saturate(1.02); box-shadow: 0 1px 0 rgba(255,255,255,0.72), 0 12px 28px rgba(15,23,42,0.06); }

/* 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; }
}