:root {
    --color-primary: #0ea5e9;
    --color-primary-dark: #0369a1;
    --color-accent: #22c55e;
    --color-surface: #f8fafc;
    --color-text: #0f172a;
    --rgb-primary: 14,165,233;
    --rgb-accent: 34,197,94;
    --radius-sm: 10px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 26px;
    --shadow-sm: 0 2px 10px rgba(3, 105, 161, .10), 0 1px 0 rgba(15, 23, 42, .04);
    --shadow-md: 0 10px 28px rgba(3, 105, 161, .14), 0 3px 10px rgba(2, 132, 199, .10), 0 1px 0 rgba(15, 23, 42, .05);
    --shadow-lg: 0 18px 46px rgba(3, 105, 161, .18), 0 8px 22px rgba(14, 165, 233, .14), 0 2px 0 rgba(15, 23, 42, .06);
    --space-section: 2rem;
    --space-card: 1rem;
    --space-gap: 0.75rem;
    --transition: 520ms cubic-bezier(.2,.9,.2,1);
    --heading-weight: 600;
    --body-line-height: 1.6;
}

body { color: var(--color-text); line-height: var(--body-line-height); background: radial-gradient(1200px 520px at 15% -10%, rgba(var(--rgb-primary), .10), transparent 55%), radial-gradient(900px 460px at 95% 0%, rgba(var(--rgb-accent, 34,197,94), .10), transparent 52%), linear-gradient(180deg, rgba(2, 132, 199, .04), rgba(248, 250, 252, 1)); }
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 14px 34px rgba(3, 105, 161, .16), 0 5px 18px rgba(14, 165, 233, .10), 0 2px 0 rgba(15, 23, 42, .05); padding: var(--space-card); transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition), background var(--transition), filter var(--transition); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: background var(--transition), border-color var(--transition), color var(--transition), transform var(--transition), box-shadow var(--transition); }
a:not([class]) { color: var(--color-primary); transition: color var(--transition), text-shadow var(--transition), opacity var(--transition); }
a:not([class]):hover { color: #0284c7; text-shadow: 0 0 22px rgba(14,165,233,.28); }

:root { caret-color: var(--color-primary); accent-color: var(--color-accent); }

/* ========== 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: var(--space-gap); border: 1px solid rgba(2, 132, 199, .10); background: linear-gradient(180deg, rgba(248,250,252, .92), rgba(248,250,252, .78)); }
                .news-grid .card:hover { box-shadow: 0 20px 54px rgba(3,105,161,.18), 0 10px 28px rgba(14,165,233,.14), 0 2px 0 rgba(15, 23, 42, .06); transform: translateY(-2px); }

/* features: grid-2 */
.feature-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: calc(var(--space-gap) * 1.5); }
.feature-list .card, .feature-list [class*="card"] { border: 1px solid rgba(34, 197, 94, .14); background: linear-gradient(180deg, rgba(255,255,255,.86), rgba(248,250,252,.76)); }

/* hero: left-aligned */
.hero-content { text-align: left; max-width: 600px; }
.hero, [class*="hero"], section:first-of-type { background: radial-gradient(900px 480px at 10% 0%, rgba(14,165,233,.28), transparent 60%), radial-gradient(800px 520px at 90% 10%, rgba(34,197,94,.22), transparent 55%), linear-gradient(135deg, rgba(3,105,161,.95), rgba(2,132,199,.78)); border-bottom: 1px solid rgba(255,255,255,.14); }
.hero, [class*="hero"], section:first-of-type h1, .hero, [class*="hero"], section:first-of-type h2, .hero, [class*="hero"], section:first-of-type h3, .hero, [class*="hero"], section:first-of-type p { color: rgba(255,255,255,.92); }
.hero, [class*="hero"], section:first-of-type a:not([class]) { color: rgba(255,255,255,.95); text-shadow: 0 0 18px rgba(14,165,233,.28); }
.hero, [class*="hero"], section:first-of-type a:not([class]):hover { color: #e0f2fe; text-shadow: 0 0 26px rgba(34,197,94,.30); }

/* testimonials: masonry */
.testimonial-list { column-count: 2; column-gap: var(--space-gap); }
                .testimonial-list > * { break-inside: avoid; margin-bottom: var(--space-gap); }
                .testimonial-list .card { border: 1px solid rgba(2, 132, 199, .12); background: linear-gradient(180deg, rgba(255,255,255,.86), rgba(248,250,252,.74)); box-shadow: 0 12px 30px rgba(3,105,161,.14), 0 4px 12px rgba(14,165,233,.10); }

/* partners: scroll */
/* 自动滚动 */
                .partner-grid { display: flex; gap: 2rem; overflow: hidden; animation: partnerScroll 20s linear infinite; }
                @keyframes partnerScroll { 0% { transform: translateX(0); } 100% { transform: translateX(-50%); } }
                .partner-grid .card, .partner-grid [class*="card"] { border: 1px solid rgba(34,197,94,.12); background: linear-gradient(180deg, rgba(248,250,252,.92), rgba(248,250,252,.72)); box-shadow: 0 10px 26px rgba(34,197,94,.10), 0 4px 14px rgba(3,105,161,.10); }

/* faq: single-column */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-list .card, .faq-list [class*="card"] { border: 1px solid rgba(2, 132, 199, .12); background: linear-gradient(180deg, rgba(255,255,255,.86), rgba(248,250,252,.74)); }

/* stats: grid-3 */
.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); text-align: center; }
.stats-grid .card, .stats-grid [class*="card"] { border: 1px solid rgba(14,165,233,.14); background: linear-gradient(180deg, rgba(248,250,252,.92), rgba(255,255,255,.80)); box-shadow: 0 16px 40px rgba(14,165,233,.12), 0 6px 18px rgba(3,105,161,.10); }

/* cta: centered */
.cta-inner { text-align: center; max-width: 700px; margin: 0 auto; }
.cta-inner .card, .cta-inner [class*="card"] { border: 1px solid rgba(34,197,94,.16); background: radial-gradient(900px 420px at 50% -10%, rgba(34,197,94,.18), transparent 55%), linear-gradient(180deg, rgba(255,255,255,.90), rgba(248,250,252,.76)); box-shadow: 0 20px 56px rgba(34,197,94,.12), 0 10px 28px rgba(14,165,233,.12); }

/* 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 480px at 10% 0%, rgba(14,165,233,.28), transparent 60%), radial-gradient(800px 520px at 90% 10%, rgba(34,197,94,.22), transparent 55%), linear-gradient(135deg, rgba(3,105,161,.95), rgba(2,132,199,.78)); }
.card { border: 1px solid rgba(2, 132, 199, .12); background-clip: padding-box; }

.btn:focus, button[class*="btn"]:focus, a[class*="btn"]:focus, .card:focus { outline: 2px solid rgba(14,165,233,.35); outline-offset: 3px; }

/* 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; }
}