:root {
    --color-primary: #0ea5e9;
    --color-primary-dark: #0369a1;
    --color-accent: #34d399;
    --color-surface: #f8fafc;
    --color-text: #082f3a;

    --rgb-primary: 14,165,233;
    --rgb-accent: 52,211,153;

    --radius-sm: 12px;
    --radius-md: 18px;
    --radius-lg: 24px;
    --radius-xl: 28px;

    --shadow-sm: 0 1px 0 rgba(2, 132, 199, .18), 0 6px 16px rgba(2, 132, 199, .10);
    --shadow-md: 0 10px 28px rgba(2, 132, 199, .14), 0 2px 10px rgba(8, 47, 58, .08), 0 1px 0 rgba(255,255,255,.65) inset;
    --shadow-lg: 0 18px 46px rgba(2, 132, 199, .18), 0 6px 18px rgba(8, 47, 58, .10), 0 1px 0 rgba(255,255,255,.72) inset;

    --space-section: 3rem;
    --space-card: 1.25rem;
    --space-gap: 1rem;

    --transition: 420ms cubic-bezier(.16, 1, .3, 1);
    --heading-weight: 700;
    --body-line-height: 1.6;
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: radial-gradient(1200px 700px at 15% -10%, rgba(var(--rgb-primary), .18), transparent 55%), radial-gradient(1000px 600px at 100% 0%, rgba(var(--rgb-accent), .16), transparent 50%), linear-gradient(180deg, #f8fafc, #f1f5f9); }
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);
    padding: var(--space-card);
    transition: var(--transition);
    background: linear-gradient(180deg, rgba(255,255,255,.92), rgba(255,255,255,.78));
    box-shadow:
        0 14px 40px rgba(3, 105, 161, .16),
        0 4px 14px rgba(8, 47, 58, .10),
        0 1px 0 rgba(255,255,255,.72) inset;
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    box-shadow: 0 10px 24px rgba(3, 105, 161, .14), 0 1px 0 rgba(255,255,255,.65) inset;
}
a:not([class]) { color: var(--color-primary); transition: var(--transition); text-shadow: 0 1px 0 rgba(255,255,255,.45); }

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

/* news: grid-4 */
/* 四列紧凑网格 */
                .news-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: calc(var(--space-gap) * 0.8); }

/* features: horizontal */
/* 水平滚动 */
                .feature-list { display: flex; gap: var(--space-gap); overflow-x: auto; scroll-snap-type: x mandatory; }
                .feature-list > * { flex: 0 0 300px; scroll-snap-align: start; }

/* hero: split */
/* 左文右图 */
                .hero-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; align-items: center; }

/* testimonials: stacked */
/* 垂直堆叠 */
                .testimonial-list { display: flex; flex-direction: column; gap: var(--space-gap); max-width: 720px; margin: 0 auto; }

/* partners: centered */
.partner-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 2rem; }

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

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

/* cta: split */
.cta-inner { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 2rem; }

/* 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 420px at 18% 20%, rgba(var(--rgb-accent), .26), transparent 58%),
        radial-gradient(900px 520px at 95% 0%, rgba(var(--rgb-primary), .24), transparent 55%),
        linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
}
.card { border-left: 4px solid rgba(var(--rgb-primary), .95); }

/* 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; }
}