:root {
    --color-primary: #1d4ed8;
    --color-primary-dark: #1e3a8a;
    --color-accent: #22c55e;
    --color-surface: #f5f7ff;
    --color-text: #0f172a;
    --rgb-primary: 29,78,216;
    --rgb-accent: 34,197,94;
    --radius-sm: 4px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 22px;
    --shadow-sm: 0 1px 0 rgba(15,23,42,.06), 0 10px 18px rgba(29,78,216,.10);
    --shadow-md: 0 2px 0 rgba(15,23,42,.06), 0 14px 28px rgba(2,6,23,.14), 0 1px 6px rgba(29,78,216,.10);
    --shadow-lg: 0 2px 0 rgba(15,23,42,.06), 0 24px 60px rgba(2,6,23,.18), 0 10px 20px rgba(29,78,216,.14);
    --space-section: 3rem;
    --space-card: 1.25rem;
    --space-gap: 1rem;
    --transition: 0.55s cubic-bezier(.2,.9,.2,1);
    --heading-weight: 650;
    --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: var(--radius-xl);
    box-shadow:
        0 1px 0 rgba(255,255,255,.65) inset,
        0 -1px 0 rgba(2,6,23,.10) inset,
        0 18px 40px rgba(2,6,23,.18),
        0 10px 18px rgba(29,78,216,.14),
        0 2px 6px rgba(34,197,94,.10);
    padding: var(--space-card);
    transition: var(--transition);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    box-shadow:
        0 1px 0 rgba(255,255,255,.55) inset,
        0 12px 26px rgba(2,6,23,.14),
        0 6px 14px rgba(29,78,216,.18);
}
a:not([class]) {
    color: var(--color-primary);
    transition: var(--transition);
    text-shadow: 0 1px 0 rgba(255,255,255,.35);
}

/* ========== 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; }

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

/* hero: minimal */
.hero { padding: 2rem 0; } .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); }

/* partners: scroll */
/* 自动滚动 */
                .partner-grid { display: flex; gap: 2rem; overflow: hidden; animation: partnerScroll 22s linear infinite; }
                @keyframes partnerScroll { 0% { transform: translateX(0); } 100% { transform: translateX(-50%); } }

/* faq: single-column */
.faq-list { max-width: 800px; margin: 0 auto; }

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

/* cta: full-bg */
.cta-section {
    background:
        radial-gradient(1200px 420px at 15% 15%, rgba(34,197,94,.38), rgba(34,197,94,0) 55%),
        radial-gradient(900px 380px at 85% 25%, rgba(129,140,248,.55), rgba(129,140,248,0) 60%),
        linear-gradient(135deg, #0ea5e9 0%, #1d4ed8 42%, #1e3a8a 100%);
    color: #f8fafc;
    padding: 4rem 2rem;
    border-radius: 0 0 var(--radius-xl) var(--radius-xl);
    box-shadow:
        0 1px 0 rgba(255,255,255,.25) inset,
        0 -1px 0 rgba(2,6,23,.18) inset,
        0 30px 70px rgba(2,6,23,.25);
    transition: var(--transition);
}

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

/* 条件性装饰 */
.card { border-left: 3px solid transparent; border-image: linear-gradient(180deg, #22c55e 0%, #1d4ed8 45%, #818cf8 100%) 1; }
header, .header, .navbar {
    box-shadow:
        0 1px 0 rgba(255,255,255,.45) inset,
        0 18px 40px rgba(2,6,23,.16),
        0 8px 18px rgba(29,78,216,.16);
    backdrop-filter: saturate(1.1) blur(10px);
    -webkit-backdrop-filter: saturate(1.1) blur(10px);
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
    transition: var(--transition);
}

/* 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; }
}