:root {
    --color-primary: #3b82f6;
    --color-primary-dark: #1e293b;
    --color-accent: #60a5fa;
    --color-surface: #ffffff;
    --color-text: #1e293b;
    --rgb-primary: 59,130,246;
    --rgb-accent: 96,165,250;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 18px;
    --shadow-sm: 0 0 12px rgba(59,130,246,0.18);
    --shadow-md: 0 0 24px rgba(59,130,246,0.28), 0 2px 8px rgba(15,23,42,0.28);
    --shadow-lg: 0 0 32px rgba(59,130,246,0.55), 0 8px 24px rgba(15,23,42,0.42);
    --space-section: 4.25rem;
    --space-card: 1.75rem;
    --space-gap: 1.25rem;
    --transition: 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    --heading-weight: 600;
    --body-line-height: 1.65;
}

/* 基础覆盖 */
body { background: #e2e8f0; color: var(--color-text); line-height: var(--body-line-height); accent-color: #3b82f6; caret-color: #3b82f6; }
h1, h2, h3, h4 { font-weight: var(--heading-weight); text-shadow: 0 0 18px rgba(59,130,246,0.18); }
section, .section { padding-top: var(--space-section); padding-bottom: var(--space-section); }
.card, [class*="card"] { background: var(--color-surface); border-radius: var(--radius-lg); box-shadow: var(--shadow-md); padding: var(--space-card); transition: var(--transition); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); background: linear-gradient(135deg, #3b82f6, #1d4ed8); box-shadow: 0 0 18px rgba(59,130,246,0.35); transition: var(--transition); }
a:not([class]) { color: var(--color-primary); transition: var(--transition); }

/* ========== 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: horizontal */
/* 水平滚动 */
                .feature-list { display: flex; gap: var(--space-gap); overflow-x: auto; scroll-snap-type: x mandatory; }
                .feature-list > * { flex: 0 0 300px; scroll-snap-align: start; }

/* hero: overlay */
/* 全屏背景+文字覆盖 */
                .hero { position: relative; min-height: 70vh; display: flex; align-items: center; }
                .hero-content { position: relative; z-index: 1; text-shadow: 0 0 32px rgba(96,165,250,0.55), 0 2px 6px rgba(15,23,42,0.6); }

/* 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: two-column */
.faq-list { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-gap); }

/* 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; }

/* Page Layout: wide */
/* 超宽 */
            .page-main { max-width: 1400px; margin: 0 auto; }

/* 条件性装饰 */
.card:hover, [class*="card"]:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); animation: glowPulse 2.6s ease-in-out infinite; }
a:not([class]):hover { color: var(--color-accent); text-shadow: 0 0 12px rgba(96,165,250,0.6); }
.hero, [class*="hero"], section:first-of-type { background: linear-gradient(135deg, #334155 0%, #1e293b 48%, #1e3a8a 100%); }
.card { border-left: 3px solid var(--color-primary); }
header, .header, .navbar { background: rgba(15,23,42,0.74); backdrop-filter: blur(14px) saturate(140%); -webkit-backdrop-filter: blur(14px) saturate(140%); box-shadow: 0 0 28px rgba(59,130,246,0.32); }

@keyframes glowPulse {
    0%, 100% { box-shadow: 0 0 24px rgba(59,130,246,0.35), 0 6px 18px rgba(15,23,42,0.35); }
    50% { box-shadow: 0 0 40px rgba(96,165,250,0.62), 0 6px 22px rgba(15,23,42,0.42); }
}

/* 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; }
}