:root {
    --color-primary: #0ea5e9;
    --color-primary-dark: #0369a1;
    --color-accent: #a78bfa;
    --color-surface: #f5fbff;
    --color-text: #08121f;
    --rgb-primary: 14,165,233;
    --rgb-accent: 167,139,250;
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --shadow-sm: 0 1px 0 rgba(3, 105, 161, .10), 0 10px 22px rgba(2, 132, 199, .10);
    --shadow-md: 0 10px 24px rgba(2, 132, 199, .14), 0 2px 0 rgba(255,255,255,.55) inset;
    --shadow-lg: 0 22px 55px rgba(3, 105, 161, .18), 0 10px 18px rgba(0, 0, 0, .08), 0 1px 0 rgba(255,255,255,.55) inset;
    --space-section: 3.25rem;
    --space-card: 1.25rem;
    --space-gap: 1.25rem;
    --transition: 280ms cubic-bezier(.2,.9,.2,1);
    --heading-weight: 850;
    --body-line-height: 1.75;
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: radial-gradient(1200px 800px at 10% -10%, rgba(14,165,233,.12), transparent 55%), radial-gradient(900px 700px at 95% 0%, rgba(167,139,250,.14), transparent 48%), var(--color-surface); }
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,.75) inset,
        0 18px 40px rgba(3, 105, 161, .16),
        0 2px 0 rgba(167,139,250,.16);
    padding: var(--space-card);
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background var(--transition);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition), border-color var(--transition);
}
a:not([class]) {
    color: var(--color-primary);
    transition: color var(--transition), text-shadow var(--transition), filter var(--transition);
    text-shadow: 0 1px 0 rgba(255,255,255,.55);
}

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

/* news: masonry-2 */
/* 两列瀑布流 */
                .news-grid { column-count: 2; column-gap: var(--space-gap); }
                .news-grid .card { break-inside: avoid; margin-bottom: calc(var(--space-gap) * 0.65); }

/* features: grid-2 */
.feature-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: calc(var(--space-gap) * 1.65); }

/* hero: split */
/* 左文右图 */
                .hero-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 2.75rem; align-items: center; }

/* 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) * 1.75); align-items: center; }

/* faq: with-sidebar */
/* FAQ 左 + 联系信息右 */
                .faq-wrapper { display: grid; grid-template-columns: 2fr 1fr; gap: 2.5rem; }

/* stats: grid-4 */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: calc(var(--space-gap) * 0.9); text-align: center; }

/* cta: split */
.cta-inner { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 2.75rem; }

/* 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(-7px);
    box-shadow:
        0 1px 0 rgba(255,255,255,.85) inset,
        0 28px 70px rgba(14,165,233,.22),
        0 14px 28px rgba(167,139,250,.16),
        0 2px 0 rgba(255,255,255,.45);
    border-color: rgba(var(--rgb-primary), .35);
}
a:not([class]):hover {
    color: var(--color-accent);
    text-shadow: 0 0 18px rgba(167,139,250,.35), 0 1px 0 rgba(255,255,255,.75);
    filter: saturate(1.15);
}
.hero, [class*="hero"], section:first-of-type {
    background:
        radial-gradient(900px 420px at 15% 20%, rgba(14,165,233,.55), rgba(14,165,233,0) 55%),
        radial-gradient(760px 380px at 85% 15%, rgba(167,139,250,.45), rgba(167,139,250,0) 52%),
        linear-gradient(135deg, #0ea5e9, #0369a1 55%, #7c3aed);
}
.card { border: 1px solid rgba(14,165,233,.22); background: rgba(255,255,255,.55); }
header, .header, .navbar {
    box-shadow:
        0 1px 0 rgba(255,255,255,.65) inset,
        0 10px 26px rgba(3, 105, 161, .14),
        0 2px 0 rgba(167,139,250,.14);
}

/* 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: 2.6rem; --space-card: 1.15rem; --space-gap: 1rem; --radius-xl: 22px; }
    .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; }
}