:root {
    --color-primary: #0d1b2a;
    --color-primary-dark: #050a12;
    --color-accent: #00d4ff;
    --color-surface: #f8f9fa;
    --color-text: #e0e6ed;
    --rgb-primary: 13,27,42;
    --rgb-accent: 0,212,255;
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --shadow-sm: 0 0 8px rgba(0,212,255,0.2), 0 0 16px rgba(0,212,255,0.1);
    --shadow-md: 0 0 16px rgba(0,212,255,0.3), 0 0 24px rgba(0,212,255,0.2);
    --shadow-lg: 0 0 24px rgba(0,212,255,0.4), 0 0 32px rgba(0,212,255,0.3);
    --space-section: 3rem;
    --space-card: 1.25rem;
    --space-gap: 1rem;
    --transition: 0.3s ease-in-out;
    --heading-weight: 600;
    --body-line-height: 1.75;
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: #0d1b2a; }
h1, h2, h3, h4 { font-weight: var(--heading-weight); }
section, .section { padding-top: var(--space-section); padding-bottom: var(--space-section); }
.card, [class*="card"] { border-radius: var(--radius-md); box-shadow: var(--shadow-md); padding: var(--space-card); transition: var(--transition); }
.card:hover, [class*="card"]:hover { box-shadow: 0 0 32px rgba(0,212,255,0.6), 0 0 48px rgba(0,212,255,0.3); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-sm); transition: var(--transition); background: var(--color-accent); color: #0d1b2a; }
.btn:hover, button[class*="btn"]:hover, a[class*="btn"]:hover { box-shadow: 0 0 24px rgba(0,212,255,0.6); transform: translateY(-2px); }
a:not([class]) { color: var(--color-accent); 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); background: #fdf6e3; padding: 2rem; border-radius: var(--radius-md); }
.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); background: #1b2838; padding: 2rem; border-radius: var(--radius-md); }

/* hero: minimal */
.hero { padding: 2rem 0; background: #ffffff; color: #0d1b2a; } .hero-content { max-width: 560px; }

/* testimonials: carousel */
/* 单条轮播 */
.testimonial-list { display: flex; overflow: hidden; background: #ffffff; padding: 2rem; border-radius: var(--radius-md); } 
.testimonial-list > * { flex: 0 0 100%; }

/* partners: scroll */
/* 自动滚动 */
.partner-grid { display: flex; gap: 2rem; overflow: hidden; animation: partnerScroll 25s linear infinite; background: #fdf6e3; padding: 2rem; border-radius: var(--radius-md); }
@keyframes partnerScroll { 0% { transform: translateX(0); } 100% { transform: translateX(-50%); } }

/* faq: single-column */
.faq-list { max-width: 800px; margin: 0 auto; background: #1b2838; padding: 2rem; border-radius: var(--radius-md); }

/* stats: grid-4 */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); text-align: center; background: #ffffff; padding: 2rem; border-radius: var(--radius-md); color: #0d1b2a; }

/* cta: centered */
.cta-inner { text-align: center; max-width: 700px; margin: 0 auto; background: #fdf6e3; padding: 2rem; border-radius: var(--radius-md); }

/* 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: #00d4ff; text-shadow: 0 0 8px rgba(0,212,255,0.6); }
header, .header, .navbar { background: transparent; }

/* Glow effect on cards within dark sections */
.dark-section { color: #e0e6ed; }
.dark-section .card { background: rgba(255,255,255,0.05); backdrop-filter: blur(2px); }

/* Pulsing accent on hover for interactive elements */
.btn:active { transform: scale(0.95); }

/* 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; }
}