:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1e3a8a;
    --color-accent: #06b6d4;
    --color-surface: #f3f7ff;
    --color-text: #172554;
    --rgb-primary: 37,99,235;
    --rgb-accent: 6,182,212;
    --radius-sm: 2px;
    --radius-md: 4px;
    --radius-lg: 6px;
    --radius-xl: 6px;
    --shadow-sm: 0 1px 2px rgba(var(--rgb-primary),.10), 0 0 0 1px rgba(var(--rgb-accent),.08);
    --shadow-md: 0 2px 6px rgba(var(--rgb-primary),.12), 0 0 0 1px rgba(var(--rgb-primary),.07), 0 1px 0 rgba(255,255,255,.6) inset;
    --shadow-lg: 0 6px 18px rgba(var(--rgb-primary),.10), 0 0 0 1px rgba(var(--rgb-accent),.08), 0 1px 0 rgba(255,255,255,.7) inset;
    --space-section: 4rem;
    --space-card: 1.5rem;
    --space-gap: 1.25rem;
    --transition: 0.28s cubic-bezier(.22,.61,.36,1);
    --heading-weight: 800;
    --body-line-height: 1.75;
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: linear-gradient(180deg, #f8fbff 0%, #eef4ff 100%); caret-color: var(--color-accent); accent-color: var(--color-primary); }
h1, h2, h3, h4 { font-weight: var(--heading-weight); color: #1d2f6f; text-shadow: 0 1px 0 rgba(255,255,255,.75); }
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: linear-gradient(180deg, rgba(255,255,255,.96) 0%, rgba(243,247,255,.98) 100%); border-color: rgba(var(--rgb-primary),.16); border-style: solid; backdrop-filter: blur(10px) saturate(1.08); filter: saturate(1.02); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); box-shadow: 0 2px 6px rgba(var(--rgb-primary),.14), 0 0 0 1px rgba(var(--rgb-accent),.10); border-color: rgba(var(--rgb-primary),.22); border-style: solid; text-shadow: 0 1px 0 rgba(255,255,255,.35); }
a:not([class]) { color: var(--color-primary); transition: var(--transition); text-decoration-color: rgba(var(--rgb-accent),.45); text-shadow: 0 1px 0 rgba(255,255,255,.65); }

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

/* news: featured-top */
/* 首篇横跨全宽 */
                .news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }
                .news-grid > *:first-child { grid-column: span 3; box-shadow: 0 4px 12px rgba(var(--rgb-primary),.12), 0 0 0 1px rgba(var(--rgb-accent),.10); border-radius: var(--radius-xl); background: linear-gradient(135deg, rgba(255,255,255,.98) 0%, rgba(233,244,255,.96) 100%); }

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

/* hero: left-aligned */
.hero-content { text-align: left; max-width: 600px; color: #1e3a8a; }

/* testimonials: carousel */
/* 单条轮播 */
                .testimonial-list { display: flex; overflow: hidden; filter: drop-shadow(0 6px 14px rgba(var(--rgb-primary),.10)); } 
                .testimonial-list > * { flex: 0 0 100%; background: linear-gradient(180deg, rgba(255,255,255,.97) 0%, rgba(240,248,255,.95) 100%); border-radius: var(--radius-lg); }

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

/* faq: with-sidebar */
/* FAQ 左 + 联系信息右 */
                .faq-wrapper { display: grid; grid-template-columns: 2fr 1fr; gap: 2rem; }

/* stats: grid-3 */
.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); text-align: center; }

/* cta: card-style */
.cta-inner { background: linear-gradient(135deg, #f3f7ff 0%, #e0f2fe 100%); border-radius: var(--radius-xl); padding: 3rem; text-align: center; box-shadow: 0 8px 20px rgba(var(--rgb-primary),.10), 0 0 0 1px rgba(var(--rgb-accent),.12), 0 1px 0 rgba(255,255,255,.7) inset; border-color: rgba(var(--rgb-primary),.14); border-style: solid; }

/* 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); opacity: .92; }
header, .header, .navbar { background: linear-gradient(180deg, rgba(248,251,255,.78) 0%, rgba(248,251,255,.18) 100%); backdrop-filter: blur(12px) saturate(1.1); box-shadow: 0 1px 0 rgba(var(--rgb-primary),.08); }

/* 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; }
}