:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-accent: #06b6d4;
    --color-surface: #f8fafc;
    --color-text: #0f172a;
    --rgb-primary: 37,99,235;
    --rgb-accent: 6,182,212;
    --radius-sm: 5px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 18px;
    --shadow-sm: 0 1px 0 rgba(2,6,23,.06), 0 8px 20px rgba(2,6,23,.06);
    --shadow-md: 0 1px 0 rgba(2,6,23,.06), 0 10px 30px rgba(2,6,23,.08), 0 2px 8px rgba(37,99,235,.12);
    --shadow-lg: 0 1px 0 rgba(2,6,23,.06), 0 22px 60px rgba(2,6,23,.12), 0 10px 25px rgba(37,99,235,.14);
    --space-section: 5rem;
    --space-card: 2rem;
    --space-gap: 1.5rem;
    --transition: 0.55s cubic-bezier(0.22, 1, 0.36, 1);
    --heading-weight: 800;
    --body-line-height: 1.6;
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: radial-gradient(1200px 600px at 20% -10%, rgba(var(--rgb-primary), .10), transparent 55%), radial-gradient(900px 500px at 95% 10%, rgba(var(--rgb-accent), .14), transparent 60%), linear-gradient(180deg, #ffffff, 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-lg); box-shadow: 0 1px 0 rgba(2,6,23,.06), 0 14px 45px rgba(2,6,23,.10), 0 4px 18px rgba(37,99,235,.10); padding: var(--space-card); transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition), background var(--transition), color var(--transition), filter var(--transition); background: linear-gradient(180deg, #ffffff, rgba(255,255,255,.88)); }
.card { border: 1px solid rgba(var(--rgb-primary), .10); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: background var(--transition), color var(--transition), box-shadow var(--transition), transform var(--transition), border-color var(--transition); }
.btn, button[class*="btn"], a[class*="btn"] { background-image: linear-gradient(135deg, rgba(var(--rgb-primary), .98), rgba(var(--rgb-accent), .88)); color: #ffffff; border: 1px solid rgba(255,255,255,.28); box-shadow: 0 12px 28px rgba(37,99,235,.20), 0 6px 16px rgba(6,182,212,.14); }
.btn:hover, button[class*="btn"]:hover, a[class*="btn"]:hover { filter: saturate(1.05) contrast(1.02); box-shadow: 0 18px 45px rgba(37,99,235,.26), 0 10px 26px rgba(6,182,212,.18); transform: translateY(-1px); }
a:not([class]) { color: var(--color-primary); transition: color var(--transition), text-shadow var(--transition), filter var(--transition); text-shadow: 0 0 0 rgba(0,0,0,0); }
a:not([class]):hover { color: var(--color-accent); text-shadow: 0 0 24px rgba(var(--rgb-accent), .30); }

/* ========== 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-4 */
.feature-list { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); }

/* hero: split */
/* 左文右图 */
                .hero-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; align-items: center; }
.hero-inner { background: linear-gradient(135deg, rgba(var(--rgb-primary), .05), rgba(var(--rgb-accent), .06)); border-radius: var(--radius-xl); }

/* testimonials: masonry */
.testimonial-list { column-count: 2; column-gap: var(--space-gap); }
                .testimonial-list > * { break-inside: avoid; margin-bottom: var(--space-gap); }
.testimonial-list > * { background-image: linear-gradient(180deg, rgba(255,255,255,.98), rgba(248,250,252,.92)); border-radius: var(--radius-lg); box-shadow: 0 1px 0 rgba(2,6,23,.06), 0 12px 32px rgba(2,6,23,.10); border: 1px solid rgba(37,99,235,.10); }

/* partners: grid-6 */
.partner-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: var(--space-gap); align-items: center; }
.partner-grid { background: radial-gradient(600px 220px at 30% 50%, rgba(var(--rgb-accent), .10), transparent 60%), radial-gradient(650px 240px at 90% 30%, rgba(var(--rgb-primary), .10), transparent 55%); padding: 1.25rem; border-radius: var(--radius-xl); }

/* faq: two-column */
.faq-list { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-gap); }
.faq-list { background: linear-gradient(180deg, rgba(255,255,255,.55), rgba(248,250,252,.35)); border-radius: var(--radius-xl); padding: 1rem; }

/* stats: grid-3 */
.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); text-align: center; }
.stats-grid { background: radial-gradient(900px 380px at 50% 0%, rgba(var(--rgb-primary), .10), transparent 62%); border-radius: var(--radius-xl); padding: 1rem; }

/* cta: full-bg */
.cta-section { background: linear-gradient(135deg, rgba(var(--rgb-primary), .98), rgba(var(--rgb-accent), .88) 60%, rgba(99,102,241,.85)); color: #ffffff; padding: 4rem 2rem; box-shadow: inset 0 1px 0 rgba(255,255,255,.30), 0 22px 70px rgba(37,99,235,.26); border-radius: var(--radius-xl); position: relative; overflow: hidden; }
.cta-section::before { content: ""; position: absolute; inset: -2px; background: radial-gradient(800px 260px at 15% 20%, rgba(255,255,255,.35), transparent 55%), radial-gradient(650px 260px at 90% 45%, rgba(255,255,255,.18), transparent 55%), linear-gradient(180deg, rgba(255,255,255,.12), transparent 55%); pointer-events: none; opacity: .9; }
.cta-section::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(255,255,255,.18), transparent 35%, rgba(255,255,255,.12)); pointer-events: none; opacity: .35; mix-blend-mode: soft-light; }

/* Page Layout: full-width */
/* 无侧边栏, 全宽 */
            .page-main { max-width: 1200px; margin: 0 auto; }

/* 条件性装饰 */
a:not([class]):hover { color: var(--color-accent); }
header, .header, .navbar { background: transparent; }
header, .header, .navbar { box-shadow: none; border-radius: 0; }

/* 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; }
    .hero-inner { padding: 0.75rem; }
}
@media (max-width: 640px) {
    :root { --space-section: 2rem; --space-card: 1rem; --space-gap: 0.75rem; --radius-sm: 6px; --radius-md: 11px; --radius-lg: 13px; --radius-xl: 16px; }
    .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; }
    .cta-section { padding: 2.5rem 1.25rem; }
}