:root {
    --color-primary: #4338ca;
    --color-primary-dark: #312e81;
    --color-accent: #22d3ee;
    --color-surface: #eef2ff;
    --color-text: #0f172a;
    --rgb-primary: 67,56,202;
    --rgb-accent: 34,211,238;
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 18px;
    --radius-xl: 28px;
    --shadow-sm: 0 2px 10px rgba(var(--rgb-primary), 0.12), 0 0 14px rgba(var(--rgb-accent), 0.07);
    --shadow-md: 0 4px 14px rgba(var(--rgb-primary), 0.16), 0 0 24px rgba(var(--rgb-accent), 0.14);
    --shadow-lg: 0 10px 28px rgba(var(--rgb-primary), 0.20), 0 0 36px rgba(var(--rgb-accent), 0.18);
    --space-section: 3rem;
    --space-card: 1.25rem;
    --space-gap: 1rem;
    --transition: 0.35s cubic-bezier(0.22, 1, 0.36, 1);
    --heading-weight: 700;
    --body-line-height: 1.65;
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: var(--color-surface); }
h1, h2, h3, h4 { font-weight: var(--heading-weight); color: var(--color-primary-dark); }
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); background: var(--color-surface); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); box-shadow: 0 0 18px rgba(var(--rgb-accent), 0.25); }
a:not([class]) { color: var(--color-primary); transition: var(--transition); text-shadow: 0 1px 8px rgba(var(--rgb-accent), 0.16); }

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

/* news: grid-4 */
/* 四列紧凑网格 */
                .news-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: calc(var(--space-gap) * 0.8); }

/* features: grid-2 */
.feature-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: calc(var(--space-gap) * 1.5); }

/* hero: centered */
.hero-content { text-align: center; max-width: 800px; margin: 0 auto; }

/* testimonials: stacked */
/* 垂直堆叠 */
                .testimonial-list { display: flex; flex-direction: column; gap: var(--space-gap); max-width: 720px; margin: 0 auto; }

/* partners: grid-6 */
.partner-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: var(--space-gap); align-items: center; }

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

/* stats: big-number */
/* 大数字居中 */
                .stats-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 2rem; }
                .stats-grid .stat-value { font-size: 3rem; }

/* cta: full-bg */
.cta-section { background: var(--color-primary); color: #ecfeff; padding: 4rem 2rem; box-shadow: 0 0 40px rgba(var(--rgb-accent), 0.35), inset 0 0 28px rgba(var(--rgb-accent), 0.22); }

/* 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); text-shadow: 0 0 14px rgba(var(--rgb-accent), 0.65); }
.hero, [class*="hero"], section:first-of-type { background: linear-gradient(135deg, #1e1b4b, #4c1d95); box-shadow: inset 0 0 80px rgba(var(--rgb-accent), 0.14); }
.card { border-left: 3px solid var(--color-accent); }

/* 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; }
}