:root {
    --color-primary: #3b82f6;
    --color-primary-dark: #1e40af;
    --color-accent: #60a5fa;
    --color-surface: #f1f5f9;
    --color-text: #1e293b;
    --rgb-primary: 59,130,246;
    --rgb-accent: 96,165,250;
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 18px;
    --shadow-sm: 0 1px 2px rgba(15,23,42,.06), 0 0 0 1px rgba(59,130,246,.06);
    --shadow-md: 0 2px 4px -1px rgba(15,23,42,.08), 0 10px 24px -8px rgba(30,41,59,.18);
    --shadow-lg: 0 14px 32px -10px rgba(30,41,59,.28), 0 6px 16px -6px rgba(59,130,246,.24);
    --space-section: 2rem;
    --space-card: 1rem;
    --space-gap: 0.75rem;
    --transition: 0.45s cubic-bezier(.22,.61,.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(168deg, #f8fafc 0%, #eef2f7 48%, #e2e8f0 100%); }
h1, h2, h3, h4 { font-weight: var(--heading-weight); background-image: linear-gradient(90deg, #1e293b 0%, #334155 60%, #3b82f6 100%); background-clip: text; -webkit-background-clip: text; }
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(155deg, #ffffff 0%, #f8fafc 55%, #eef4fb 100%); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); background: linear-gradient(120deg, #3b82f6 0%, #2563eb 50%, #1d4ed8 100%); color: #f8fafc; box-shadow: 0 2px 6px -2px rgba(37,99,235,.45); }
a:not([class]) { color: var(--color-primary); transition: var(--transition); }

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

/* news: masonry-2 */
/* 两列瀑布流 */
                .news-grid { column-count: 2; column-gap: var(--space-gap); }
                .news-grid .card { break-inside: avoid; margin-bottom: var(--space-gap); }

/* 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; }

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

/* partners: centered */
.partner-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 2rem; }

/* 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: full-bg */
.cta-section { background: linear-gradient(135deg, #1e293b 0%, #334155 45%, #3b82f6 100%); color: #f8fafc; padding: 4rem 2rem; }

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

/* 条件性装饰 */
.card:hover, [class*="card"]:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.card { border: 1px solid rgba(var(--rgb-primary), .16); border-image: linear-gradient(135deg, rgba(59,130,246,.55) 0%, rgba(96,165,250,.28) 45%, rgba(30,41,59,.12) 100%) 1; }
header, .header, .navbar { box-shadow: 0 1px 0 rgba(226,232,240,.9), 0 4px 16px -6px rgba(30,41,59,.28); background: linear-gradient(120deg, #ffffff 0%, #f1f5f9 60%, #e2e8f0 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; }
}