:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1e3a8a;
    --color-accent: #60a5fa;
    --color-surface: #f8fbff;
    --color-text: #1e293b;
    --rgb-primary: 37,99,235;
    --rgb-accent: 96,165,250;
    --radius-sm: 12px;
    --radius-md: 20px;
    --radius-lg: 26px;
    --radius-xl: 34px;
    --shadow-sm: 0 8px 20px rgba(15, 23, 42, 0.08), 0 2px 6px rgba(96, 165, 250, 0.12);
    --shadow-md: 0 18px 40px rgba(15, 23, 42, 0.12), 0 4px 14px rgba(37, 99, 235, 0.12), inset 0 1px 0 rgba(255, 255, 255, 0.8);
    --shadow-lg: 0 28px 56px rgba(15, 23, 42, 0.18), 0 10px 24px rgba(37, 99, 235, 0.16), inset 0 1px 0 rgba(255, 255, 255, 0.75);
    --space-section: 4rem;
    --space-card: 1.5rem;
    --space-gap: 1.25rem;
    --transition: 0.36s cubic-bezier(0.22, 1, 0.36, 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: linear-gradient(180deg, #e2e8f0 0%, #cbd5e1 100%); caret-color: var(--color-primary); }
h1, h2, h3, h4 { font-weight: var(--heading-weight); color: #0f172a; text-shadow: 0 1px 0 rgba(255, 255, 255, 0.65); }
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: linear-gradient(180deg, rgba(255, 255, 255, 0.96) 0%, rgba(241, 245, 249, 0.98) 100%); border-color: rgba(148, 163, 184, 0.4); border-style: solid; filter: saturate(1.03); backdrop-filter: blur(10px); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); box-shadow: 0 10px 22px rgba(37, 99, 235, 0.18), inset 0 1px 0 rgba(255, 255, 255, 0.55); border-color: rgba(37, 99, 235, 0.28); border-style: solid; accent-color: var(--color-accent); }
a:not([class]) { color: var(--color-primary); transition: var(--transition); text-decoration-color: rgba(37, 99, 235, 0.35); }

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

/* news: list-view */
/* 列表模式 (图左文右) */
                .news-grid { display: flex; flex-direction: column; gap: var(--space-gap); }
                .news-grid .card { display: grid; grid-template-columns: 280px 1fr; box-shadow: 0 20px 42px rgba(15, 23, 42, 0.12), 0 6px 18px rgba(59, 130, 246, 0.12), inset 0 1px 0 rgba(255, 255, 255, 0.82); }

/* features: horizontal */
/* 水平滚动 */
                .feature-list { display: flex; gap: var(--space-gap); overflow-x: auto; scroll-snap-type: x mandatory; scrollbar-color: #60a5fa #cbd5e1; }
                .feature-list > * { flex: 0 0 300px; scroll-snap-align: start; border-radius: var(--radius-lg); box-shadow: var(--shadow-sm); background: linear-gradient(180deg, #ffffff 0%, #eff6ff 100%); }

/* hero: split */
/* 左文右图 */
                .hero-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; align-items: center; }

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

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

/* cta: full-bg */
.cta-section { background: linear-gradient(135deg, #1e293b 0%, #334155 55%, #2563eb 100%); color: #f8fafc; padding: 4rem 2rem; box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08), 0 26px 54px rgba(15, 23, 42, 0.28); }

/* 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 12px rgba(96, 165, 250, 0.25); }
.hero, [class*="hero"], section:first-of-type { background: linear-gradient(135deg, #1e293b 0%, #334155 52%, #3b82f6 100%); color: #f8fafc; box-shadow: inset 0 -1px 0 rgba(255, 255, 255, 0.08); }

/* 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; }
}