:root {
    --color-primary: #4f46e5;
    --color-primary-dark: #312e81;
    --color-accent: #f59e0b;
    --color-surface: #f7f7fb;
    --color-text: #1f1b2e;
    --rgb-primary: 79,70,229;
    --rgb-accent: 245,158,11;
    --radius-sm: 2px;
    --radius-md: 3px;
    --radius-lg: 5px;
    --radius-xl: 8px;
    --shadow-sm: 0 1px 2px rgba(31,27,46,.06), 0 0 0 1px rgba(31,27,46,.04);
    --shadow-md: 0 2px 4px rgba(31,27,46,.05), 0 10px 24px -12px rgba(79,70,229,.22), inset 0 0 0 1px rgba(31,27,46,.04);
    --shadow-lg: 0 4px 10px rgba(31,27,46,.06), 0 20px 44px -18px rgba(79,70,229,.32), inset 0 0 0 1px rgba(31,27,46,.05);
    --space-section: 4.5rem;
    --space-card: 1.75rem;
    --space-gap: 1.25rem;
    --transition: 0.24s cubic-bezier(0.22, 0.61, 0.36, 1);
    --heading-weight: 700;
    --body-line-height: 1.75;
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: var(--color-surface); }
h1, h2, h3, h4 { font-weight: var(--heading-weight); color: var(--color-primary-dark); }
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-color: #ffffff; background-image: linear-gradient(145deg, rgba(255,255,255,1) 0%, rgba(247,247,251,.6) 100%); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); background-color: var(--color-primary); color: #ffffff; box-shadow: 0 1px 2px rgba(31,27,46,.08), 0 8px 18px -9px rgba(79,70,229,.58); }
a:not([class]) { color: var(--color-primary); transition: var(--transition); }

/* ========== 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; background: linear-gradient(135deg, #eef2ff 0%, #ffffff 68%); box-shadow: 0 2px 6px rgba(31,27,46,.05), 0 18px 44px -18px rgba(79,70,229,.45), inset 4px 0 0 #4f46e5; }

/* features: horizontal */
/* 水平滚动 */
                .feature-list { display: flex; gap: var(--space-gap); overflow-x: auto; scroll-snap-type: x mandatory; scrollbar-color: rgba(79,70,229,.45) rgba(247,247,251,.8); }
                .feature-list > * { flex: 0 0 300px; scroll-snap-align: start; background: linear-gradient(160deg, #fffbeb 0%, #ffffff 64%); box-shadow: 0 1px 0 rgba(31,27,46,.04), 0 12px 28px -14px rgba(245,158,11,.55), inset 0 3px 0 #f59e0b; }

/* hero: minimal */
.hero { padding: 2rem 0; background: radial-gradient(circle at 20% 0%, rgba(79,70,229,.08), transparent 55%); } .hero-content { max-width: 560px; }

/* testimonials: masonry */
.testimonial-list { column-count: 2; column-gap: var(--space-gap); }
                .testimonial-list > * { break-inside: avoid; margin-bottom: var(--space-gap); background: linear-gradient(170deg, #ecfeff 0%, #ffffff 66%); box-shadow: 0 2px 6px rgba(31,27,46,.04), 0 14px 30px -16px rgba(6,182,212,.45), inset 0 0 0 1px rgba(6,182,212,.14); }

/* partners: scroll */
/* 自动滚动 */
                .partner-grid { display: flex; gap: 2rem; overflow: hidden; animation: partnerScroll 20s linear infinite; }
                @keyframes partnerScroll { 0% { transform: translateX(0); } 100% { transform: translateX(-50%); } }

/* faq: with-sidebar */
/* FAQ 左 + 联系信息右 */
                .faq-wrapper { display: grid; grid-template-columns: 2fr 1fr; gap: 2rem; background: radial-gradient(circle at 100% 0%, rgba(245,158,11,.10), transparent 60%); border-radius: var(--radius-xl); }

/* stats: grid-3 */
.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); text-align: center; color: var(--color-primary-dark); background: linear-gradient(180deg, rgba(79,70,229,.06), rgba(79,70,229,0)); border-radius: var(--radius-xl); }

/* cta: split */
.cta-inner { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 2rem; background: linear-gradient(90deg, rgba(79,70,229,.08), rgba(245,158,11,.10)); border-radius: var(--radius-xl); box-shadow: var(--shadow-sm); }

/* Page Layout: full-width */
/* 无侧边栏, 全宽 */
            .page-main { max-width: 1200px; margin: 0 auto; }

/* 条件性装饰 */
a:not([class]):hover { color: var(--color-accent); }
header, .header, .navbar { box-shadow: 0 1px 0 rgba(31,27,46,.06), 0 10px 30px -18px rgba(31,27,46,.30); background-color: rgba(255,255,255,.86); backdrop-filter: blur(10px) saturate(140%); }

/* 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: 1.8rem; --space-card: 0.9rem; --space-gap: 0.7rem; }
    .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; }
}