:root {
    --color-primary: #0ea5e9;
    --color-primary-dark: #0369a1;
    --color-accent: #3b82f6;
    --color-surface: #f8fafc;
    --color-text: #0f172a;
    --rgb-primary: 14,165,233;
    --rgb-accent: 59,130,246;
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 18px;
    --radius-xl: 26px;
    --shadow-sm: 0 1px 0 rgba(15, 23, 42, 0.06), 0 6px 14px rgba(2, 6, 23, 0.10);
    --shadow-md: 0 2px 0 rgba(15, 23, 42, 0.06), 0 14px 28px rgba(2, 6, 23, 0.14), 0 1px 0 rgba(255,255,255,0.75) inset;
    --shadow-lg: 0 3px 0 rgba(15, 23, 42, 0.07), 0 28px 60px rgba(2, 6, 23, 0.20), 0 0 0 1px rgba(59,130,246,0.14) inset;
    --space-section: 2rem;
    --space-card: 1rem;
    --space-gap: 0.75rem;
    --transition: 0.55s cubic-bezier(0.2, 0.9, 0.2, 1);
    --heading-weight: 800;
    --body-line-height: 1.75;
}

body { color: var(--color-text); line-height: var(--body-line-height); background: radial-gradient(1200px 600px at 10% -10%, rgba(59,130,246,0.18), rgba(59,130,246,0) 60%), radial-gradient(900px 480px at 90% 0%, rgba(14,165,233,0.16), rgba(14,165,233,0) 55%), linear-gradient(180deg, #0b1220, #0f172a 55%, #0b1220); }
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 1px 0 rgba(255,255,255,0.55) inset, 0 18px 40px rgba(2, 6, 23, 0.18), 0 2px 0 rgba(15, 23, 42, 0.06);
    padding: var(--space-card);
    transition: transform 0.55s cubic-bezier(0.2, 0.9, 0.2, 1), box-shadow 0.55s cubic-bezier(0.2, 0.9, 0.2, 1), background 0.55s cubic-bezier(0.2, 0.9, 0.2, 1), border-color 0.55s cubic-bezier(0.2, 0.9, 0.2, 1);
    background:
        linear-gradient(180deg, rgba(248,250,252,0.98), rgba(248,250,252,0.92)) padding-box,
        linear-gradient(135deg, rgba(59,130,246,0.35), rgba(14,165,233,0.12) 45%, rgba(59,130,246,0.18)) border-box;
    border: 1px solid rgba(148, 163, 184, 0.22);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: transform 0.55s cubic-bezier(0.2, 0.9, 0.2, 1), box-shadow 0.55s cubic-bezier(0.2, 0.9, 0.2, 1), background 0.55s cubic-bezier(0.2, 0.9, 0.2, 1), color 0.55s cubic-bezier(0.2, 0.9, 0.2, 1), border-color 0.55s cubic-bezier(0.2, 0.9, 0.2, 1);
}
a:not([class]) { color: var(--color-primary); transition: var(--transition); text-shadow: 0 1px 0 rgba(255,255,255,0.08); }

/* ========== 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: minimal */
.hero { padding: 2rem 0; } .hero-content { max-width: 560px; }

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

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

/* cta: centered */
.cta-inner { text-align: center; max-width: 700px; margin: 0 auto; }

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

/* 条件性装饰 */
.card:hover, [class*="card"]:hover {
    transform: translateY(-5px);
    box-shadow: 0 1px 0 rgba(255,255,255,0.65) inset, 0 30px 70px rgba(2, 6, 23, 0.26), 0 0 0 1px rgba(59,130,246,0.28) inset, 0 0 24px rgba(59,130,246,0.14);
    background:
        linear-gradient(180deg, rgba(255,255,255,0.98), rgba(248,250,252,0.9)) padding-box,
        linear-gradient(135deg, rgba(59,130,246,0.55), rgba(14,165,233,0.18) 48%, rgba(59,130,246,0.28)) border-box;
}
header, .header, .navbar {
    box-shadow:
        0 1px 0 rgba(255,255,255,0.06) inset,
        0 16px 40px rgba(2, 6, 23, 0.14),
        0 0 0 1px rgba(148, 163, 184, 0.12);
    background: linear-gradient(180deg, rgba(15, 23, 42, 0.62), rgba(15, 23, 42, 0.35));
    backdrop-filter: blur(10px) saturate(120%);
    border-radius: var(--radius-lg);
}

/* 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; }
}