:root {
    --color-primary: #3730a3;
    --color-primary-dark: #1e1b4b;
    --color-accent: #7c3aed;
    --color-surface: #ffffff;
    --color-text: #1e293b;
    --rgb-primary: 55,48,163;
    --rgb-accent: 124,58,237;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --shadow-sm: 0 1px 4px rgba(15,23,42,.06), 0 0 12px rgba(var(--rgb-accent),.05);
    --shadow-md: 0 6px 20px rgba(15,23,42,.08), 0 0 24px rgba(var(--rgb-accent),.12);
    --shadow-lg: 0 12px 30px rgba(15,23,42,.12), 0 0 36px rgba(var(--rgb-accent),.35);
    --space-section: 3.25rem;
    --space-card: 1.375rem;
    --space-gap: .9rem;
    --transition: 0.3s cubic-bezier(.22,.61,.36,1);
    --heading-weight: 800;
    --body-line-height: 1.7;
}

@keyframes cardGlow {
    from {
        box-shadow: 0 8px 24px rgba(15,23,42,.10), 0 0 20px rgba(var(--rgb-accent),.22);
    }
    to {
        box-shadow: 0 16px 40px rgba(15,23,42,.18), 0 0 48px rgba(var(--rgb-accent),.65);
    }
}

body { color: var(--color-text); line-height: var(--body-line-height); background-color: #f1f5f9; }
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); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); }
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: 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: left-aligned */
.hero-content { text-align: left; max-width: 600px; }

/* 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: 2.25rem; }

/* faq: with-sidebar */
/* FAQ 左 + 联系信息右 */
                .faq-wrapper { display: grid; grid-template-columns: 2fr 1fr; gap: 2.25rem; }

/* stats: grid-3 */
.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); text-align: center; }

/* cta: split */
.cta-inner { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 2.25rem; }

/* 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); animation: cardGlow 1.6s ease-in-out infinite alternate; }
a:not([class]):hover { color: var(--color-accent); }
header, .header, .navbar { box-shadow: 0 2px 12px rgba(15,23,42,.05), 0 0 20px rgba(var(--rgb-accent),.05); }

/* 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: 2.25rem; --space-card: 1rem; --space-gap: .8rem; }
    .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; }
}