:root {
    --color-primary: #ff3d57;
    --color-primary-dark: #b1002a;
    --color-accent: #38bdf8;
    --color-surface: #f0f9ff;
    --color-text: #1f2937;
    --rgb-primary: 255,61,87;
    --rgb-accent: 56,189,248;
    --radius-sm: 3px;
    --radius-md: 8px;
    --radius-lg: 18px;
    --radius-xl: 24px;
    --shadow-sm: 0 2px 6px rgba(0,0,0,.06);
    --shadow-md: 0 4px 10px rgba(2,6,23,.06), 0 20px 40px -18px rgba(2,6,23,.14);
    --shadow-lg: 0 8px 24px rgba(2,6,23,.12), 0 26px 60px -26px rgba(2,6,23,.18);
    --space-section: 5rem;
    --space-card: 2rem;
    --space-gap: 1.5rem;
    --transition: 0.38s cubic-bezier(.2,.8,.2,1);
    --heading-weight: 700;
    --body-line-height: 1.6;
    --shadow-card-edge: 0 0 0 1px rgba(255,255,255,.65) inset, 0 0 0 1px rgba(2,6,23,.06);
}

/* 基础覆盖 */
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: var(--shadow-md); padding: var(--space-card); transition: var(--transition); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); }
a:not([class]) { color: var(--color-primary); transition: var(--transition); text-shadow: 0 1px 0 rgba(255,255,255,.55); }

/* ========== 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: grid-3 */
.feature-list { display: grid; grid-template-columns: repeat(3, 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; }

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

/* partners: centered */
.partner-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 2rem; }

/* faq: two-column */
.faq-list { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-gap); }

/* stats: grid-4 */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); text-align: center; }

/* cta: full-bg */
.cta-section { background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 70%, #6d28d9 130%); color: #ffffff; padding: 4rem 2rem; box-shadow: 0 18px 45px rgba(177,0,42,.25); }

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

/* 条件性装饰 */
.card:hover, [class*="card"]:hover { transform: translateY(-5px); box-shadow: 0 4px 8px rgba(2,6,23,.06), 0 20px 40px -10px rgba(2,6,23,.14), 0 0 0 1px rgba(var(--rgb-primary), .18) inset; }
.hero, [class*="hero"], section:first-of-type { background: radial-gradient(1200px 600px at 10% 10%, rgba(56,189,248,.35) 0%, rgba(56,189,248,0) 60%), radial-gradient(900px 520px at 90% 30%, rgba(255,61,87,.35) 0%, rgba(255,61,87,0) 58%), linear-gradient(135deg, #ff3d57, #b1002a); }
.card { border: 1px solid rgba(var(--rgb-primary), .14); background: rgba(255,255,255,.78); box-shadow: 0 4px 10px rgba(2,6,23,.06), 0 20px 40px -18px rgba(2,6,23,.14), var(--shadow-card-edge); }
header, .header, .navbar { background: transparent; }

/* 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; }
}