:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1e3a8a;
    --color-accent: #93c5fd;
    --color-surface: #f0f5ff;
    --color-text: #0f172a;
    --rgb-primary: 37,99,235;
    --rgb-accent: 147,197,253;
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --shadow-sm: 0 1px 4px rgba(37,99,235,.08), 0 2px 8px rgba(37,99,235,.06);
    --shadow-md: 0 6px 18px rgba(37,99,235,.12), 0 2px 6px rgba(37,99,235,.08);
    --shadow-lg: 0 14px 36px rgba(37,99,235,.16), 0 6px 12px rgba(37,99,235,.08);
    --space-section: 4rem;
    --space-card: 1.5rem;
    --space-gap: 1.25rem;
    --transition: 0.5s cubic-bezier(0.22, 0.61, 0.36, 1);
    --heading-weight: 700;
    --body-line-height: 1.7;
}

body { color: var(--color-text); line-height: var(--body-line-height); background: linear-gradient(160deg, #f0f5ff 0%, #e0eaff 50%, #f5f8ff 100%); }
h1, h2, h3, h4 { font-weight: var(--heading-weight); background: linear-gradient(135deg, #1e3a8a, #2563eb, #60a5fa); -webkit-background-clip: text; background-clip: text; }
section, .section { padding-top: var(--space-section); padding-bottom: var(--space-section); background: linear-gradient(180deg, rgba(240,245,255,0) 0%, rgba(224,234,255,.4) 100%); }
.card, [class*="card"] { border-radius: var(--radius-lg); box-shadow: var(--shadow-md); padding: var(--space-card); transition: var(--transition); background: linear-gradient(145deg, #ffffff 0%, #f0f5ff 60%, #e0eaff 100%); border: 1px solid transparent; border-image: linear-gradient(135deg, #2563eb, #93c5fd, #60a5fa) 1; }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); background: linear-gradient(135deg, #2563eb 0%, #60a5fa 100%); border: 1px solid transparent; border-image: linear-gradient(135deg, #1e3a8a, #93c5fd) 1; }
a:not([class]) { color: var(--color-primary); transition: var(--transition); }

/* ========== 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; }

/* features: grid-3 */
.feature-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }

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

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

/* cta: centered */
.cta-inner { text-align: center; max-width: 700px; margin: 0 auto; background: linear-gradient(135deg, rgba(37,99,235,.06), rgba(147,197,253,.12), rgba(96,165,250,.06)); border-radius: var(--radius-xl); box-shadow: var(--shadow-lg); }

/* Page Layout: full-width */
/* 无侧边栏, 全宽 */
            .page-main { max-width: 1200px; margin: 0 auto; }

/* 条件性装饰 */
header, .header, .navbar { box-shadow: 0 4px 24px rgba(37,99,235,.14), 0 1px 4px rgba(37,99,235,.08); background: linear-gradient(180deg, #ffffff 0%, #f0f5ff 100%); }

/* 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; }
}