:root {
    --color-primary: #3b82f6;
    --color-primary-dark: #1e3a5f;
    --color-accent: #60a5fa;
    --color-surface: #f0f5ff;
    --color-text: #1a2332;
    --rgb-primary: 59,130,246;
    --rgb-accent: 96,165,250;
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --shadow-sm: 0 1px 3px rgba(30,58,95,.08), 0 1px 2px rgba(30,58,95,.06);
    --shadow-md: 0 4px 12px rgba(30,58,95,.10), 0 2px 4px rgba(30,58,95,.06);
    --shadow-lg: 0 12px 32px rgba(30,58,95,.14), 0 4px 8px rgba(30,58,95,.08);
    --space-section: 4rem;
    --space-card: 1.5rem;
    --space-gap: 1.25rem;
    --transition: 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --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(160deg, #f0f5ff 0%, #e8effa 40%, #f5f8ff 100%); }
h1, h2, h3, h4 { font-weight: var(--heading-weight); background: linear-gradient(135deg, #1a2332 0%, #252e3a 50%, #1e3a5f 100%); -webkit-background-clip: text; -webkit-text-fill-color: transparent; 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(145deg, #ffffff 0%, #f8faff 50%, #eef4ff 100%); border: 1px solid rgba(59,130,246,.10); }
.card:hover, [class*="card"]:hover { box-shadow: 0 16px 40px rgba(30,58,95,.16), 0 6px 12px rgba(59,130,246,.10); border-color: rgba(59,130,246,.22); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); background: linear-gradient(135deg, #3b82f6 0%, #2563eb 50%, #1d4ed8 100%); color: #ffffff; border: none; box-shadow: 0 2px 8px rgba(37,99,235,.30), 0 1px 3px rgba(37,99,235,.20); }
.btn:hover, button[class*="btn"]:hover, a[class*="btn"]:hover { box-shadow: 0 6px 20px rgba(37,99,235,.40), 0 2px 6px rgba(37,99,235,.25); background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 50%, #1e40af 100%); }
a:not([class]) { color: var(--color-primary); transition: var(--transition); }
a:not([class]):hover { color: var(--color-primary-dark); }

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

/* news: featured-left */
/* 左大右小 (1大+2小) */
                .news-grid { display: grid; grid-template-columns: 2fr 1fr; grid-template-rows: auto auto; gap: var(--space-gap); }
                .news-grid > *:first-child { grid-row: span 2; }

/* features: grid-4 */
.feature-list { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); }

/* hero: split */
/* 左文右图 */
                .hero-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; align-items: center; background: linear-gradient(135deg, rgba(240,245,255,.60) 0%, rgba(224,236,255,.40) 50%, rgba(240,245,255,.60) 100%); border-radius: var(--radius-xl); }

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

/* partners: scroll */
/* 自动滚动 */
                .partner-grid { display: flex; gap: 2rem; overflow: hidden; animation: partnerScroll 20s linear infinite; background: linear-gradient(90deg, #f0f5ff 0%, #e0ecff 25%, #f0f5ff 50%, #e0ecff 75%, #f0f5ff 100%); }
                @keyframes partnerScroll { 0% { transform: translateX(0); } 100% { transform: translateX(-50%); } }

/* faq: single-column */
.faq-list { max-width: 800px; margin: 0 auto; }

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

/* cta: centered */
.cta-inner { text-align: center; max-width: 700px; margin: 0 auto; background: linear-gradient(180deg, rgba(240,245,255,.80) 0%, rgba(224,236,255,.60) 100%); border-radius: var(--radius-lg); }

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

/* 条件性装饰 */
header, .header, .navbar { box-shadow: 0 2px 8px rgba(30,58,95,.10), 0 1px 3px rgba(30,58,95,.06); background: linear-gradient(180deg, #252e3a 0%, #1e2836 100%); border-bottom: 1px solid rgba(59,130,246,.15); }

/* 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; }
}