:root {
    --color-primary: #2563eb;
    --color-primary-dark: #0f172a;
    --color-accent: #38bdf8;
    --color-surface: #e2e8f0;
    --color-text: #0f172a;
    --rgb-primary: 37,99,235;
    --rgb-accent: 56,189,248;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 20px;
    --shadow-sm: 0 0 10px rgba(56,189,248,.22), 0 2px 6px rgba(15,23,42,.08);
    --shadow-md: 0 0 22px rgba(56,189,248,.32), 0 8px 20px rgba(15,23,42,.12);
    --shadow-lg: 0 0 34px rgba(56,189,248,.55), 0 16px 34px rgba(15,23,42,.20);
    --space-section: 5rem;
    --space-card: 2rem;
    --space-gap: 1.25rem;
    --transition: 0.35s cubic-bezier(.22,1,.36,1);
    --heading-weight: 800;
    --body-line-height: 1.75;
}

/* 基础覆盖 */
body {
    background-color: #eef2f7;
    background-image: radial-gradient(circle at 50% 0%, rgba(var(--rgb-accent), .18), rgba(var(--rgb-accent), 0) 62%);
    background-attachment: fixed;
    color: var(--color-text);
    line-height: var(--body-line-height);
    caret-color: var(--color-accent);
}
h1, h2, h3, h4 { font-weight: var(--heading-weight); color: #0b1220; text-shadow: 0 1px 0 rgba(255,255,255,.65); }
section, .section { padding-top: var(--space-section); padding-bottom: var(--space-section); }
.card, [class*="card"] { border-radius: var(--radius-lg); box-shadow: var(--shadow-md); padding: var(--space-card); transition: var(--transition); background-color: #ffffff; }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); box-shadow: 0 0 14px rgba(var(--rgb-accent), .28), inset 0 0 0 1px rgba(var(--rgb-accent), .35); accent-color: var(--color-accent); }
a:not([class]) { color: var(--color-primary); transition: var(--transition); }

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

/* news: grid-3 */
/* 三列等宽网格 */
                .news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }

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

/* partners: scroll */
/* 自动滚动 */
                .partner-grid { display: flex; gap: 2rem; overflow: hidden; animation: partnerScroll 26s cubic-bezier(.4,0,.2,1) infinite; opacity: .92; }
                @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: 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: 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(-4px); box-shadow: 0 0 32px rgba(56,189,248,.60), 0 14px 30px rgba(15,23,42,.22); }
.card { border: 1px solid rgba(var(--rgb-accent), .30); border-style: solid; }

/* 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; }
}