:root {
    --color-primary: #3b4f7a;
    --color-primary-dark: #1b2540;
    --color-accent: #7c9cff;
    --color-surface: #f4f7ff;
    --color-text: #18233a;
    --rgb-primary: 59,79,122;
    --rgb-accent: 124,156,255;
    --radius-sm: 10px;
    --radius-md: 12px;
    --radius-lg: 14px;
    --radius-xl: 16px;
    --shadow-sm: 0 0 0 1px rgba(124,156,255,.14), 0 6px 14px rgba(27,37,64,.08), 0 0 18px rgba(124,156,255,.12);
    --shadow-md: 0 0 0 1px rgba(124,156,255,.16), 0 10px 24px rgba(27,37,64,.12), 0 0 24px rgba(124,156,255,.22);
    --shadow-lg: 0 0 0 1px rgba(124,156,255,.2), 0 16px 32px rgba(27,37,64,.16), 0 0 32px rgba(124,156,255,.36);
    --space-section: 2rem;
    --space-card: 1rem;
    --space-gap: 0.75rem;
    --transition: 0.38s ease-out;
    --heading-weight: 600;
    --body-line-height: 1.6;
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: linear-gradient(180deg, #f8faff 0%, #eef3ff 100%); caret-color: var(--color-accent); accent-color: var(--color-accent); }
h1, h2, h3, h4 { font-weight: var(--heading-weight); color: var(--color-primary-dark); text-shadow: 0 1px 0 rgba(255,255,255,.65); }
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: rgba(255,255,255,.78); border-color: rgba(124,156,255,.18); border-style: solid; backdrop-filter: blur(10px) saturate(1.08); -webkit-backdrop-filter: blur(10px) saturate(1.08); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); background: linear-gradient(135deg, #7c9cff 0%, #5f84f6 100%); color: #fdfdff; border-color: rgba(124,156,255,.38); border-style: solid; box-shadow: 0 0 0 1px rgba(255,255,255,.12) inset, 0 8px 18px rgba(59,79,122,.16), 0 0 24px rgba(124,156,255,.4); text-shadow: 0 1px 1px rgba(27,37,64,.28); }
a:not([class]) { color: var(--color-primary); transition: var(--transition); text-decoration-color: rgba(124,156,255,.45); text-shadow: 0 0 12px rgba(124,156,255,.12); }

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

/* 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: grid-4 */
.partner-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: calc(var(--space-gap) * 1.5); align-items: center; }

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

/* stats: inline */
/* 水平排列 */
                .stats-grid { display: flex; justify-content: center; gap: 3rem; }

/* cta: split */
.cta-inner { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 2rem; }

/* Page Layout: narrow-centered */
/* 窄版居中 */
            .page-main { max-width: 860px; margin: 0 auto; }

/* 条件性装饰 */
.card:hover, [class*="card"]:hover { transform: translateY(-4px); box-shadow: 0 0 0 1px rgba(124,156,255,.24), 0 18px 34px rgba(27,37,64,.18), 0 0 32px rgba(124,156,255,.6); filter: brightness(1.02); }
.hero, [class*="hero"], section:first-of-type { background: linear-gradient(135deg, #445a86 0%, #1b2540 52%, #7c9cff 100%); box-shadow: inset 0 1px 0 rgba(255,255,255,.08), 0 0 24px rgba(124,156,255,.4); }

/* 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; }
}