:root {
    --color-primary: #3b82f6;
    --color-primary-dark: #0b1220;
    --color-accent: #a855f7;
    --color-surface: #eef2ff;
    --color-text: #0b1220;
    --rgb-primary: 59,130,246;
    --rgb-accent: 168,85,247;

    --radius-sm: 3px;
    --radius-md: 6px;
    --radius-lg: 10px;
    --radius-xl: 14px;

    --shadow-sm: 0 1px 0 rgba(var(--rgb-primary), .10), 0 10px 26px rgba(15,23,42,.06);
    --shadow-md: 0 2px 0 rgba(var(--rgb-primary), .12), 0 14px 42px rgba(15,23,42,.08);
    --shadow-lg: 0 3px 0 rgba(var(--rgb-accent), .14), 0 22px 66px rgba(2,6,23,.12), 0 10px 24px rgba(var(--rgb-primary), .10);

    --space-section: 4rem;
    --space-card: 1.5rem;
    --space-gap: 1.25rem;

    --transition: 240ms cubic-bezier(0.16, 1, 0.3, 1);
    --heading-weight: 650;
    --body-line-height: 1.75;
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: radial-gradient(900px 500px at 10% 0%, rgba(var(--rgb-primary), .10), transparent 55%), radial-gradient(800px 520px at 90% 10%, rgba(var(--rgb-accent), .10), transparent 50%), linear-gradient(180deg, #f8fafc, 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 0 0 1px rgba(2, 6, 23, .06) inset,
        0 1px 0 rgba(2, 6, 23, .06),
        0 10px 28px rgba(2, 6, 23, .08),
        0 2px 10px rgba(var(--rgb-primary), .10);
    padding: var(--space-card);
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background-color var(--transition), color var(--transition);
}
.card:hover, [class*="card"]:hover { transform: translateY(-3px); box-shadow: 0 0 0 1px rgba(var(--rgb-accent), .18) inset, 0 2px 0 rgba(2, 6, 23, .08), 0 22px 60px rgba(2, 6, 23, .14), 0 10px 28px rgba(var(--rgb-primary), .16); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: transform var(--transition), box-shadow var(--transition), color var(--transition), background-color var(--transition), border-color var(--transition); }
a:not([class]) { color: var(--color-primary); transition: var(--transition); text-shadow: 0 0 0 rgba(0,0,0,0); }
a:not([class]):hover { color: var(--color-accent); text-shadow: 0 6px 18px rgba(var(--rgb-accent), .22); }

.color-surface { background-color: var(--color-surface); }

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

/* news: featured-top */
/* 首篇横跨全宽 */
                .news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }
                .news-grid > *:first-child { grid-column: span 3; }

/* features: grid-3 */
.feature-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }

/* hero: left-aligned */
.hero-content { text-align: left; max-width: 600px; }

/* 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: single-column */
.faq-list { max-width: 800px; margin: 0 auto; }

/* 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: wide */
/* 超宽 */
            .page-main { max-width: 1400px; margin: 0 auto; }

/* 条件性装饰 */
.hero, [class*="hero"], section:first-of-type {
    background:
        radial-gradient(900px 520px at 15% 10%, rgba(var(--rgb-primary), .32), transparent 55%),
        radial-gradient(820px 520px at 85% 15%, rgba(var(--rgb-accent), .28), transparent 52%),
        linear-gradient(135deg, #0b1220, #0b2a5a 52%, #3b1a6b);
    box-shadow: 0 -1px 0 rgba(255,255,255,.06) inset, 0 10px 60px rgba(2,6,23,.10);
}
header, .header, .navbar { background: transparent; }
header, .header, .navbar { backdrop-filter: saturate(130%) blur(6px); -webkit-backdrop-filter: saturate(130%) blur(6px); }

.card:focus-within, [class*="card"]:focus-within {
    outline: 2px solid rgba(var(--rgb-accent), .35);
    outline-offset: 2px;
    box-shadow:
        0 0 0 1px rgba(var(--rgb-accent), .22) inset,
        0 2px 0 rgba(2, 6, 23, .08),
        0 22px 60px rgba(2, 6, 23, .14),
        0 10px 28px rgba(var(--rgb-primary), .18);
}

@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; --transition: 220ms cubic-bezier(0.18, 1, 0.32, 1); --radius-xl: 12px; }
    .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; }
}