:root {
    --color-primary: #3b82f6;
    --color-primary-dark: #1d4ed8;
    --color-accent: #60a5fa;
    --color-surface: #f8fafc;
    --color-text: #0f172a;
    --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 1px 0 rgba(2, 6, 23, .10), 0 8px 18px rgba(2, 6, 23, .06);
    --shadow-md: 0 1px 0 rgba(2, 6, 23, .10), 0 10px 26px rgba(2, 6, 23, .10), 0 1px 2px rgba(2, 6, 23, .06);
    --shadow-lg: 0 1px 0 rgba(2, 6, 23, .12), 0 18px 40px rgba(2, 6, 23, .14), 0 8px 18px rgba(59, 130, 246, .10);
    --space-section: 2rem;
    --space-card: 1rem;
    --space-gap: 0.75rem;
    --transition: 0.5s cubic-bezier(.2,.9,.2,1);
    --heading-weight: 800;
    --body-line-height: 1.65;
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: radial-gradient(1200px 600px at 20% -10%, rgba(59,130,246,.22), transparent 60%), radial-gradient(900px 500px at 90% 0%, rgba(96,165,250,.18), transparent 55%), linear-gradient(180deg, #0b1220 0%, #0f172a 55%, #0b1220 100%); }
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-lg); box-shadow: var(--shadow-md); padding: var(--space-card); transition: transform var(--transition), box-shadow var(--transition), background var(--transition), border-color var(--transition); background: linear-gradient(180deg, rgba(248,250,252,.98), rgba(248,250,252,.90)); border: 1px solid rgba(15, 23, 42, .08); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition), border-color var(--transition); }
a:not([class]) { color: var(--color-accent); transition: var(--transition); text-shadow: 0 0 0 rgba(0,0,0,0); }

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

/* news: list-view */
/* 列表模式 (图左文右) */
                .news-grid { display: flex; flex-direction: column; gap: var(--space-gap); }
                .news-grid .card { display: grid; grid-template-columns: 280px 1fr; background:
                    radial-gradient(900px 260px at 10% 0%, rgba(59,130,246,.18), transparent 55%),
                    linear-gradient(180deg, rgba(248,250,252,.98), rgba(248,250,252,.90)); }

/* features: grid-2 */
.feature-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: calc(var(--space-gap) * 1.5); }
.feature-list .card { background:
    linear-gradient(135deg, rgba(59,130,246,.10) 0%, rgba(248,250,252,.98) 38%, rgba(248,250,252,.90) 100%);
    border-color: rgba(59,130,246,.14); }

/* 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; }
                .hero, [class*="hero"], section:first-of-type { background:
                    linear-gradient(135deg, rgba(59,130,246,.28) 0%, rgba(29,78,216,.22) 25%, rgba(15,23,42,.10) 55%, rgba(96,165,250,.20) 100%),
                    radial-gradient(900px 500px at 15% 20%, rgba(96,165,250,.35), transparent 60%),
                    radial-gradient(600px 420px at 85% 10%, rgba(59,130,246,.30), transparent 55%),
                    linear-gradient(180deg, rgba(2,6,23,.78), rgba(15,23,42,.90)); }

/* testimonials: carousel */
/* 单条轮播 */
                .testimonial-list { display: flex; overflow: hidden; } 
                .testimonial-list > * { flex: 0 0 100%; }
                .testimonial-list .card { background:
                    radial-gradient(700px 240px at 20% -20%, rgba(59,130,246,.18), transparent 55%),
                    linear-gradient(180deg, rgba(248,250,252,.98), rgba(248,250,252,.90)); }

/* partners: scroll */
/* 自动滚动 */
                .partner-grid { display: flex; gap: 2rem; overflow: hidden; animation: partnerScroll 20s linear infinite; }
                @keyframes partnerScroll { 0% { transform: translateX(0); } 100% { transform: translateX(-50%); } }
                .partner-grid .card { background: linear-gradient(180deg, rgba(248,250,252,.92), rgba(248,250,252,.86)); }

/* faq: two-column */
.faq-list { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-gap); }
.faq-list .card { background:
    linear-gradient(180deg, rgba(248,250,252,.98), rgba(248,250,252,.90));
    border-color: rgba(59,130,246,.12); }

/* stats: big-number */
/* 大数字居中 */
                .stats-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 2rem; }
                .stats-grid .stat-value { font-size: 3rem; color: #eaf2ff; text-shadow: 0 2px 0 rgba(2,6,23,.20), 0 14px 34px rgba(59,130,246,.22); }
                .stats-grid .card { background:
                    radial-gradient(900px 260px at 50% 0%, rgba(59,130,246,.22), transparent 60%),
                    linear-gradient(180deg, rgba(248,250,252,.98), rgba(248,250,252,.90));
                    border-color: rgba(59,130,246,.16); }

/* cta: split */
.cta-inner { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 2rem; }
.cta-inner .card { background:
    linear-gradient(135deg, rgba(59,130,246,.14) 0%, rgba(248,250,252,.98) 42%, rgba(248,250,252,.90) 100%);
    border-color: rgba(59,130,246,.18); }

/* 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(-6px); box-shadow: var(--shadow-lg); border-color: rgba(59,130,246,.28); background: linear-gradient(180deg, rgba(255,255,255,.98), rgba(248,250,252,.92)); }
a:not([class]):hover { color: #93c5fd; text-shadow: 0 0 18px rgba(147,197,253,.35); }
.hero, [class*="hero"], section:first-of-type { background:
    linear-gradient(135deg, rgba(59,130,246,.30) 0%, rgba(29,78,216,.24) 25%, rgba(15,23,42,.08) 55%, rgba(96,165,250,.22) 100%),
    radial-gradient(900px 500px at 15% 20%, rgba(96,165,250,.38), transparent 60%),
    radial-gradient(600px 420px at 85% 10%, rgba(59,130,246,.33), transparent 55%),
    linear-gradient(180deg, rgba(2,6,23,.76), rgba(15,23,42,.92)); }
.card { border: 1px solid rgba(var(--rgb-primary), .16); }
header, .header, .navbar { box-shadow: 0 14px 40px rgba(2, 6, 23, .35), 0 2px 0 rgba(255,255,255,.06); background: linear-gradient(180deg, rgba(15,23,42,.72), rgba(2,6,23,.78)); border-bottom: 1px solid rgba(59,130,246,.18); }

/* 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; }
}