:root {
    --color-primary: #1d4ed8;
    --color-primary-dark: #1e40af;
    --color-accent: #3b82f6;
    --color-surface: #ffffff;
    --color-text: #334155;
    --rgb-primary: 29,78,216;
    --rgb-accent: 59,130,246;
    --radius-sm: 2px;
    --radius-md: 3px;
    --radius-lg: 2px;
    --radius-xl: 4px;
    --shadow-sm: 4px 4px 0 rgba(30, 64, 175, .28), 0 10px 20px rgba(15, 23, 42, .10);
    --shadow-md: 4px 4px 0 rgba(30, 64, 175, .36), 0 14px 26px rgba(2, 6, 23, .14);
    --shadow-lg: 4px 4px 0 rgba(29, 78, 216, .42), 0 18px 36px rgba(2, 6, 23, .18);
    --space-section: 4rem;
    --space-card: 1.5rem;
    --space-gap: 1.25rem;
    --transition: 0.15s cubic-bezier(.2,.9,.2,1);
    --heading-weight: 700;
    --body-line-height: 1.7;
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: #0f172a; }
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: 4px 4px 0 rgba(30, 64, 175, .42), 0 0 0 2px rgba(148, 163, 184, .22), 0 16px 40px rgba(2, 6, 23, .22); padding: var(--space-card); transition: var(--transition); background: linear-gradient(180deg, rgba(255,255,255, .98), rgba(248,250,252, .96)); }
.card, [class*="card"] { border: 2px solid rgba(59, 130, 246, .25); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); }
a:not([class]) { color: #60a5fa; transition: var(--transition); text-shadow: none; }

.card { border-left: 3px solid var(--color-primary); }

/* ========== 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; }
                .feature-list { background: linear-gradient(90deg, rgba(15,23,42,.2), rgba(59,130,246,.08)); border-radius: var(--radius-xl); padding: 10px; }
                .feature-list > * { box-shadow: 4px 4px 0 rgba(30, 64, 175, .25), 0 10px 24px rgba(2,6,23,.18); border: 2px solid rgba(148,163,184,.22); }

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

/* testimonials: carousel */
/* 单条轮播 */
                .testimonial-list { display: flex; overflow: hidden; background: radial-gradient(1200px 220px at 20% 0%, rgba(59,130,246,.22), rgba(15,23,42,0) 60%), linear-gradient(180deg, rgba(255,255,255,.04), rgba(255,255,255,0)); border-radius: var(--radius-xl); padding: 8px; } 
                .testimonial-list > * { flex: 0 0 100%; }
                .testimonial-list > * { box-shadow: 4px 4px 0 rgba(59,130,246,.28), 0 14px 30px rgba(2,6,23,.20); }

/* partners: grid-6 */
.partner-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: var(--space-gap); align-items: center; }
.partner-grid { filter: saturate(1.05) contrast(1.02); }
.partner-grid > * { border-radius: 3px; border: 2px solid rgba(148,163,184,.22); box-shadow: 4px 4px 0 rgba(30, 64, 175, .18); background: rgba(255,255,255,.03); }

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

/* stats: inline */
/* 水平排列 */
                .stats-grid { display: flex; justify-content: center; gap: 3rem; }
                .stats-grid { padding: 6px 0; }
                .stats-grid > * { border-radius: 3px; border: 2px solid rgba(59,130,246,.22); background: linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.02)); box-shadow: 4px 4px 0 rgba(29,78,216,.22), 0 16px 34px rgba(2,6,23,.16); }

/* cta: centered */
.cta-inner { text-align: center; max-width: 700px; margin: 0 auto; }

/* 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: linear-gradient(135deg, #0b2a6f 0%, #1e293b 48%, #0f172a 100%); box-shadow: inset 0 0 0 2px rgba(59,130,246,.22); }
.card { border-left: 3px solid var(--color-primary); }

/* 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; --radius-xl: 3px; --shadow-sm: 3px 3px 0 rgba(30, 64, 175, .28), 0 10px 18px rgba(15, 23, 42, .10); }
    .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; }
}