:root {
    --color-primary: #1e293b;
    --color-primary-dark: #0f172a;
    --color-accent: #3b82f6;
    --color-surface: #f8fafc;
    --color-text: #1e293b;
    --color-link: #2563eb;
    --rgb-primary: 30,41,59;
    --rgb-accent: 59,130,246;
    --radius-sm: 3px;
    --radius-md: 8px;
    --radius-lg: 10px;
    --radius-xl: 16px;
    --shadow-sm: 0 1px 2px rgba(15,23,42,.06), 0 2px 8px -3px rgba(59,130,246,.16);
    --shadow-md: 0 1px 3px rgba(15,23,42,.07), 0 10px 22px -10px rgba(30,41,59,.26), 0 20px 44px -26px rgba(59,130,246,.32);
    --shadow-lg: 0 4px 12px -6px rgba(15,23,42,.22), 0 22px 52px -20px rgba(59,130,246,.30), 0 44px 88px -48px rgba(30,41,59,.40);
    --space-section: 4.4rem;
    --space-card: 1.8rem;
    --space-gap: 1.35rem;
    --transition: 0.55s 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(180deg, #f8fafc 0%, #eef2f7 45%, #e2e8f0 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(158deg, #ffffff 0%, #f9fbfd 55%, #eef2f7 100%); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); box-shadow: var(--shadow-sm); }
a:not([class]) { color: var(--color-link); transition: var(--transition); }

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

/* news: list-view */
/* 列表模式 (图左文右) */
                .news-grid { display: flex; flex-direction: column; gap: var(--space-gap); }
                .news-grid .card { display: grid; grid-template-columns: 280px 1fr; }

/* 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: grid-4 */
.partner-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: calc(var(--space-gap) * 1.5); align-items: center; }

/* 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: full-bg */
.cta-section { background: linear-gradient(118deg, #0f172a 0%, #1e293b 34%, #334155 66%, #2563eb 100%); color: #f8fafc; padding: 4rem 2rem; }

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

/* 条件性装饰 */
a:not([class]):hover { color: var(--color-accent); }
.hero, [class*="hero"], section:first-of-type { background: radial-gradient(circle at 14% 18%, rgba(59,130,246,.42) 0%, rgba(59,130,246,0) 58%), linear-gradient(135deg, #0f172a 0%, #1e293b 42%, #334155 72%, #1d4ed8 100%); }
.card { border-left: 3px solid var(--color-primary); border-image: linear-gradient(180deg, #60a5fa 0%, #3b82f6 35%, #1e293b 100%) 1; }
header, .header, .navbar { background: linear-gradient(180deg, rgba(248,250,252,.92) 0%, rgba(226,232,240,.58) 100%); backdrop-filter: blur(14px) saturate(155%); }

/* 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; }
}