:root {
    --color-primary: #0ea5e9;
    --color-primary-dark: #0369a1;
    --color-accent: #22c55e;
    --color-surface: #f6fbff;
    --color-text: #0f172a;
    --rgb-primary: 14,165,233;
    --rgb-accent: 34,197,94;
    --radius-sm: 2px;
    --radius-md: 6px;
    --radius-lg: 14px;
    --radius-xl: 18px;
    --shadow-sm: 0 6px 18px rgba(var(--rgb-primary), .10), 0 1px 0 rgba(2,6,23,.10);
    --shadow-md: 0 12px 34px rgba(var(--rgb-primary), .14), 0 2px 0 rgba(2,6,23,.08);
    --shadow-lg: 0 24px 60px rgba(var(--rgb-primary), .18), 0 4px 0 rgba(2,6,23,.10);
    --space-section: 4rem;
    --space-card: 1.5rem;
    --space-gap: 1.25rem;
    --transition: 0.5s cubic-bezier(.2,.9,.2,1);
    --heading-weight: 600;
    --body-line-height: 1.65;
}

body { color: var(--color-text); line-height: var(--body-line-height); background: radial-gradient(1200px 600px at 15% -10%, rgba(var(--rgb-primary), .14), transparent 60%), radial-gradient(900px 520px at 85% 0%, rgba(34,197,94,.14), transparent 55%), linear-gradient(180deg, #f8fafc 0%, #f3f4f6 60%, #eef2ff 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:
        0 16px 40px rgba(2,6,23,.10),
        0 10px 24px rgba(var(--rgb-primary), .14),
        0 2px 0 rgba(2,6,23,.08);
    padding: var(--space-card);
    transition: transform 0.5s cubic-bezier(.2,.9,.2,1), box-shadow 0.5s cubic-bezier(.2,.9,.2,1), background 0.5s cubic-bezier(.2,.9,.2,1), border-color 0.5s cubic-bezier(.2,.9,.2,1);
    background:
        linear-gradient(180deg, rgba(255,255,255,.92) 0%, rgba(255,255,255,.74) 100%);
    border: 1px solid rgba(2,6,23,.06);
}
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: transform 0.5s cubic-bezier(.2,.9,.2,1), box-shadow 0.5s cubic-bezier(.2,.9,.2,1), background 0.5s cubic-bezier(.2,.9,.2,1), color 0.5s cubic-bezier(.2,.9,.2,1), border-color 0.5s cubic-bezier(.2,.9,.2,1); }
a:not([class]) { color: var(--color-primary); transition: color 0.5s cubic-bezier(.2,.9,.2,1), text-shadow 0.5s cubic-bezier(.2,.9,.2,1), opacity 0.5s cubic-bezier(.2,.9,.2,1); text-shadow: 0 1px 0 rgba(255,255,255,.5); }

/* ========== 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-4 */
.feature-list { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); }

/* hero: left-aligned */
.hero-content { text-align: left; max-width: 600px; }

/* testimonials: carousel */
/* 单条轮播 */
                .testimonial-list { display: flex; overflow: hidden; } 
                .testimonial-list > * { flex: 0 0 100%; }

/* 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: two-column */
.faq-list { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-gap); }

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

/* cta: card-style */
.cta-inner {
    background:
        radial-gradient(1000px 260px at 25% 0%, rgba(var(--rgb-primary), .20), transparent 55%),
        radial-gradient(900px 320px at 80% 10%, rgba(34,197,94,.18), transparent 52%),
        linear-gradient(135deg, rgba(15,23,42,.02) 0%, rgba(255,255,255,.85) 40%, rgba(255,255,255,.65) 100%),
        linear-gradient(180deg, var(--color-surface) 0%, #ffffff 100%);
    border-radius: var(--radius-xl);
    padding: 3rem;
    text-align: center;
    box-shadow:
        0 24px 70px rgba(2,6,23,.10),
        0 18px 50px rgba(var(--rgb-primary), .14),
        inset 0 1px 0 rgba(255,255,255,.75);
    border: 1px solid rgba(2,6,23,.06);
}

/* Page Layout: narrow-centered */
/* 窄版居中 */
            .page-main { max-width: 860px; margin: 0 auto; }

/* 条件性装饰 */
.card:hover, [class*="card"]:hover {
    transform: translateY(-6px);
    box-shadow:
        0 30px 86px rgba(2,6,23,.16),
        0 18px 56px rgba(var(--rgb-primary), .20),
        0 6px 0 rgba(34,197,94,.10);
    border-color: rgba(var(--rgb-primary), .26);
    background:
        radial-gradient(900px 220px at 12% 0%, rgba(var(--rgb-primary), .18), transparent 55%),
        radial-gradient(700px 240px at 88% 10%, rgba(34,197,94,.16), transparent 50%),
        linear-gradient(180deg, rgba(255,255,255,.98) 0%, rgba(255,255,255,.78) 100%);
}
.hero, [class*="hero"], section:first-of-type {
    background:
        radial-gradient(900px 420px at 20% 0%, rgba(var(--rgb-primary), .35), transparent 58%),
        radial-gradient(820px 420px at 80% 10%, rgba(34,197,94,.28), transparent 55%),
        linear-gradient(135deg, rgba(3,105,161,.98) 0%, rgba(14,165,233,.92) 35%, rgba(34,197,94,.78) 100%);
    box-shadow: inset 0 1px 0 rgba(255,255,255,.18);
}
.card { border-left: 4px solid rgba(var(--rgb-primary), .95); }
header, .header, .navbar {
    box-shadow:
        0 10px 26px rgba(2,6,23,.10),
        0 2px 0 rgba(255,255,255,.40);
    border-bottom: 1px solid rgba(2,6,23,.06);
}

/* 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; }
}