/* CSSVariantEngine v3.0 — dense-dashboard + gradient-rich */
/* Palette: slate-dashboard | Radius: rounded | Shadow: layered-blue */
/* Spacing: compact | Transition: fluid */
/* Section layouts: grid-4, centered, minimal, stacked, scroll, two-column, big-number, centered */

:root {
    --color-primary: #3b82f6;
    --color-primary-dark: #1d4ed8;
    --color-accent: #22d3ee;
    --color-surface: #f8fafc;
    --color-text: #f8fafc;
    --color-card-text: #1e293b;
    --rgb-primary: 59,130,246;
    --rgb-accent: 34,211,238;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --shadow-sm: 0 1px 2px rgba(15,23,42,.4), 0 4px 12px -2px rgba(59,130,246,.3);
    --shadow-md: 0 4px 8px rgba(15,23,42,.3), 0 12px 24px -4px rgba(59,130,246,.25);
    --shadow-lg: 0 8px 16px rgba(15,23,42,.35), 0 20px 40px -8px rgba(59,130,246,.3);
    --space-section: 1.75rem;
    --space-card: 0.875rem;
    --space-gap: 0.625rem;
    --transition: 0.5s cubic-bezier(0.22, 1, 0.36, 1);
    --heading-weight: 700;
    --body-line-height: 1.6;
}

/* 基础覆盖 */
body {
    color: var(--color-text);
    line-height: var(--body-line-height);
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 45%, #334155 100%);
}
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-md);
    padding: var(--space-card);
    transition: var(--transition);
    background:
        linear-gradient(#ffffff, #ffffff) padding-box,
        linear-gradient(135deg, rgba(59,130,246,.5), rgba(34,211,238,.25), rgba(59,130,246,.5)) border-box;
    border: 1px solid transparent;
    color: var(--color-card-text);
}

.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    background: linear-gradient(135deg, #3b82f6 0%, #2563eb 50%, #1d4ed8 100%);
    color: #ffffff;
    box-shadow: 0 0 0 1px rgba(255,255,255,.15), 0 4px 12px rgba(59,130,246,.35);
}

a:not([class]) {
    color: var(--color-primary);
    transition: var(--transition);
    text-shadow: 0 1px 2px rgba(59,130,246,.25);
}

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

/* news: grid-4 */
.news-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: calc(var(--space-gap) * 0.8); }

/* features: centered */
.feature-list { display: flex; flex-direction: column; align-items: center; gap: calc(var(--space-gap) * 2); max-width: 720px; margin: 0 auto; }

/* hero: minimal */
.hero { padding: 1.75rem 0; } .hero-content { max-width: 560px; }

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

/* partners: scroll */
.partner-grid { display: flex; gap: 1.6rem; overflow: hidden; animation: partnerScroll 18s linear infinite; }
@keyframes partnerScroll { 0% { transform: translateX(0); } 100% { transform: translateX(-50%); } }

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

/* stats: big-number */
.stats-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 1.6rem; }
.stats-grid .stat-value { font-size: 3rem; }

/* cta: centered */
.cta-inner { text-align: center; max-width: 700px; margin: 0 auto; }

/* Page Layout: wide */
.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);
    background:
        linear-gradient(#ffffff, #ffffff) padding-box,
        linear-gradient(135deg, rgba(59,130,246,.8), rgba(34,211,238,.4), rgba(59,130,246,.8)) border-box;
}
a:not([class]):hover {
    color: var(--color-accent);
    text-shadow: 0 0 8px rgba(34,211,238,.5);
}
.card { border: 1px solid transparent; }
header, .header, .navbar {
    box-shadow: 0 4px 16px rgba(0,0,0,.25), 0 1px 0 rgba(148,163,184,.15);
    background: linear-gradient(180deg, #0f172a, #1e293b);
}

/* 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: 1.6rem;
        --space-card: 0.8rem;
        --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; }
}