:root {
    --color-primary: #3b82f6;
    --color-primary-dark: #1e3a8a;
    --color-accent: #2563eb;
    --color-surface: #ffffff;
    --color-text: #1e293b;
    --rgb-primary: 59,130,246;
    --rgb-accent: 37,99,235;
    --radius-sm: 0;
    --radius-md: 0;
    --radius-lg: 0;
    --radius-xl: 0;
    --shadow-sm: 2px 2px 0 0 #64748b;
    --shadow-md: 0 0 0 1px rgba(30,41,59,.07), 4px 4px 0 0 #64748b;
    --shadow-lg: 0 0 0 1px rgba(30,41,59,.07), 8px 8px 0 0 #475569;
    --space-section: 2.5rem;
    --space-card: 1rem;
    --space-gap: 0.875rem;
    --transition: 0.15s cubic-bezier(.4,0,.2,1);
    --heading-weight: 800;
    --body-line-height: 1.7;
}

body {
    color: var(--color-text);
    line-height: var(--body-line-height);
    background-color: #e2e8f0;
    accent-color: #3b82f6;
    caret-color: #3b82f6;
}
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);
    background: #ffffff;
    transition: var(--transition);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}
a:not([class]) { color: var(--color-primary); transition: var(--transition); }

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

.news-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: calc(var(--space-gap) * 0.8); }

.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 { padding: 1.75rem 0; }
.hero-content { max-width: 560px; }

.testimonial-list { display: flex; flex-direction: column; gap: var(--space-gap); max-width: 720px; margin: 0 auto; }

.partner-grid { display: flex; gap: 1.75rem; overflow: hidden; animation: partnerScroll 28s linear infinite; }
@keyframes partnerScroll { 0% { transform: translateX(0); } 100% { transform: translateX(-50%); } }

.faq-wrapper { display: grid; grid-template-columns: 2fr 1fr; gap: 1.75rem; }

.stats-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 1.75rem; }
.stats-grid .stat-value { font-size: 3rem; }

.cta-inner {
    background: linear-gradient(180deg, #ffffff 0%, #f1f5f9 100%);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    padding: 3rem;
    text-align: center;
}

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

/* 条件性装饰 */
a:not([class]):hover { color: var(--color-accent); }
.hero, [class*="hero"], section:first-of-type {
    background: radial-gradient(circle at 82% 18%, rgba(59,130,246,.4) 0%, rgba(59,130,246,0) 42%), linear-gradient(135deg, #020617 0%, #1e293b 68%, #1e3a8a 100%);
}
.card { border-left: 3px solid var(--color-primary); }
header, .header, .navbar {
    box-shadow: 0 0 0 1px rgba(30,41,59,.06), 0 4px 0 0 #64748b;
}

/* 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; }
}