:root {
    --color-primary: #1f2937;
    --color-primary-dark: #0b1220;
    --color-accent: #7c3aed;
    --color-surface: #f7f7fb;
    --color-text: #0b1220;
    --rgb-primary: 31,41,55;
    --rgb-accent: 124,58,237;
    --radius-sm: 10px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 26px;
    --shadow-sm: 0 2px 6px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 10px rgba(0,0,0,0.10), 0 16px 36px -14px rgba(17,24,39,0.35);
    --shadow-lg: 0 6px 18px rgba(0,0,0,0.12), 0 24px 64px -26px rgba(17,24,39,0.48);
    --space-section: 4rem;
    --space-card: 1.5rem;
    --space-gap: 1.25rem;
    --transition: 0.38s cubic-bezier(0.2, 0.8, 0.2, 1);
    --heading-weight: 850;
    --body-line-height: 1.7;
}

body { color: var(--color-text); line-height: var(--body-line-height); }
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: 20px; box-shadow: 0 1px 0 rgba(255,255,255,0.7) inset, 0 10px 22px rgba(2,6,23,0.10), 0 24px 60px -30px rgba(2,6,23,0.50); 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: #2563eb; transition: var(--transition); text-shadow: 0 1px 0 rgba(255,255,255,0.35); }

/* ========== 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: grid-2 */
.feature-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: calc(var(--space-gap) * 1.5); }

/* hero: centered */
.hero-content { text-align: center; max-width: 800px; margin: 0 auto; }

/* testimonials: masonry */
.testimonial-list { column-count: 2; column-gap: var(--space-gap); }
                .testimonial-list > * { break-inside: avoid; margin-bottom: 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: single-column */
.faq-list { max-width: 800px; margin: 0 auto; }

/* stats: big-number */
/* 大数字居中 */
                .stats-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 2rem; }
                .stats-grid .stat-value { font-size: 3rem; }

/* cta: card-style */
.cta-inner { background: radial-gradient(1200px 500px at 20% 0%, rgba(124,58,237,0.22), transparent 55%), radial-gradient(900px 420px at 80% 30%, rgba(37,99,235,0.20), transparent 50%), linear-gradient(135deg, #f8fafc, #eef2ff); border-radius: var(--radius-xl); padding: 3rem; text-align: center; box-shadow: 0 1px 0 rgba(255,255,255,0.7) inset, 0 14px 36px rgba(15,23,42,0.10), 0 26px 80px -44px rgba(15,23,42,0.55); }

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

/* 条件性装饰 */
.hero, [class*="hero"], section:first-of-type { background:
    radial-gradient(900px 360px at 10% 25%, rgba(124,58,237,0.35), transparent 60%),
    radial-gradient(820px 320px at 92% 10%, rgba(37,99,235,0.30), transparent 55%),
    linear-gradient(135deg, #111827, #1f2937); }
header, .header, .navbar { background: transparent; }

/* 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; }
}