:root {
    --color-primary: #0ea5e9;
    --color-primary-dark: #0284c7;
    --color-accent: #22c55e;
    --color-surface: #f6f7fb;
    --color-text: #0b1220;
    --rgb-primary: 14,165,233;
    --rgb-accent: 34,197,94;
    --radius-sm: 3px;
    --radius-md: 5px;
    --radius-lg: 6px;
    --radius-xl: 8px;
    --shadow-sm: 0 1px 0 rgba(2,132,199,.10), 0 6px 18px rgba(2,132,199,.08);
    --shadow-md: 0 1px 0 rgba(14,165,233,.10), 0 10px 28px rgba(2,132,199,.10);
    --shadow-lg: 0 1px 0 rgba(14,165,233,.12), 0 14px 42px rgba(2,132,199,.12);
    --space-section: 5rem;
    --space-card: 2rem;
    --space-gap: 1.65rem;
    --transition: 160ms cubic-bezier(.2,.8,.2,1);
    --heading-weight: 700;
    --body-line-height: 1.6;
}

body { color: var(--color-text); line-height: var(--body-line-height); }
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(2,132,199,.08),
        0 10px 26px rgba(17,24,39,.06),
        0 1px 0 rgba(255,255,255,.55) inset;
    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), color var(--transition), background var(--transition);
}
a:not([class]) {
    color: var(--color-primary);
    transition: color var(--transition), filter var(--transition);
}

:where(.news-grid, .feature-list, .testimonial-list, .partner-grid, .faq-wrapper, .stats-grid, .cta-inner, .page-main) { color: inherit; }

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

/* news: featured-left */
/* 左大右小 (1大+2小) */
                .news-grid { display: grid; grid-template-columns: 2fr 1fr; grid-template-rows: auto auto; gap: var(--space-gap); }
                .news-grid > *:first-child { grid-row: span 2; }

/* features: centered */
/* 居中大卡片 */
                .feature-list { display: flex; flex-direction: column; align-items: center; gap: calc(var(--space-gap) * 2); max-width: 720px; margin: 0 auto; }

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

/* testimonials: masonry */
.testimonial-list { column-count: 2; column-gap: var(--space-gap); }
                .testimonial-list > * { break-inside: avoid; margin-bottom: var(--space-gap); }

/* 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%); } }

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

/* stats: inline */
/* 水平排列 */
                .stats-grid { display: flex; justify-content: center; gap: 3rem; }

/* 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 */
a:not([class]):hover { color: var(--color-accent); filter: saturate(1.05) brightness(1.02); }
.card { border-left: 3px solid color-mix(in oklab, var(--color-primary) 85%, #ffffff 15%); }
header, .header, .navbar {
    box-shadow:
        0 1px 0 rgba(2,132,199,.10),
        0 10px 30px rgba(2,132,199,.10),
        0 1px 0 rgba(255,255,255,.55) inset;
}

/* 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: 0.95rem; --transition: 140ms cubic-bezier(.2,.85,.2,1); }
    .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; }
}