:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-accent: #3b82f6;
    --color-surface: #0f172a;
    --color-text: #e5e7eb;
    --rgb-primary: 37,99,235;
    --rgb-accent: 59,130,246;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 18px;
    --shadow-sm: 0 1px 0 rgba(148,163,184,.35), 0 2px 10px rgba(2,6,23,.22);
    --shadow-md: 0 10px 26px rgba(2,6,23,.30), 0 2px 8px rgba(2,6,23,.18);
    --shadow-lg: 0 18px 42px rgba(2,6,23,.40), 0 6px 18px rgba(2,6,23,.20);
    --shadow-accent: 0 0 22px rgba(59,130,246,.35);
    --space-section: 4rem;
    --space-card: 1.15rem;
    --space-gap: 0.9rem;
    --transition: 360ms cubic-bezier(0.2, 0.9, 0.2, 1);
    --heading-weight: 800;
    --body-line-height: 1.7;
    --grid-card-radius: 12px;
    --ring: rgba(59,130,246,.55);
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: radial-gradient(1200px 600px at 20% 0%, rgba(37,99,235,.16), transparent 55%), radial-gradient(900px 500px at 90% 15%, rgba(59,130,246,.14), transparent 50%), linear-gradient(180deg, #0b1226 0%, #0f172a 65%, #0b1226 100%); }
h1, h2, h3, h4 { font-weight: var(--heading-weight); text-shadow: 0 1px 0 rgba(0,0,0,.25); }
section, .section { padding-top: var(--space-section); padding-bottom: var(--space-section); }
.card, [class*="card"] { border-radius: var(--grid-card-radius); box-shadow: var(--shadow-md), 0 0 0 1px rgba(148,163,184,.12) inset, var(--shadow-accent); padding: var(--space-card); transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition), background var(--transition), filter var(--transition); background: linear-gradient(180deg, rgba(255,255,255,.92) 0%, rgba(226,232,240,.92) 100%); color: #0f172a; position: relative; }
.card::before, [class*="card"]::before { content: ""; position: absolute; inset: 0; border-radius: inherit; background: radial-gradient(800px 240px at 30% -10%, rgba(59,130,246,.18), transparent 55%), radial-gradient(600px 240px at 90% 0%, rgba(37,99,235,.16), transparent 52%); opacity: .75; pointer-events: none; }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: background var(--transition), color var(--transition), box-shadow var(--transition), transform var(--transition), border-color var(--transition); box-shadow: 0 0 0 1px rgba(148,163,184,.18) inset; }
a:not([class]) { color: #93c5fd; transition: color var(--transition), text-shadow var(--transition), filter var(--transition), opacity var(--transition); text-shadow: 0 0 0 rgba(0,0,0,0); }
a:not([class]):hover { color: #60a5fa; text-shadow: 0 0 22px rgba(59,130,246,.55); }
.hero, [class*="hero"], section:first-of-type { background: radial-gradient(1200px 420px at 10% 10%, rgba(59,130,246,.35), transparent 55%), radial-gradient(980px 360px at 80% 0%, rgba(37,99,235,.30), transparent 50%), linear-gradient(135deg, #0b1226 0%, #0f172a 55%, rgba(37,99,235,.10) 100%); }
header, .header, .navbar { box-shadow: 0 10px 30px rgba(2,6,23,.35), 0 1px 0 rgba(148,163,184,.16) inset; background: linear-gradient(180deg, rgba(15,23,42,.78) 0%, rgba(15,23,42,.62) 100%); backdrop-filter: blur(10px) saturate(120%); -webkit-backdrop-filter: blur(10px) saturate(120%); }

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

/* news: grid-3 */
/* 三列等宽网格 */
                .news-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); }
                .news-grid > * { min-width: 0; border-radius: var(--radius-sm); transition: box-shadow var(--transition), transform var(--transition), filter var(--transition); }

/* features: grid-3 */
.feature-list { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); }
.feature-list > * { border-radius: var(--radius-sm); }

/* hero: centered */
.hero-content { text-align: center; max-width: 800px; margin: 0 auto; }
.hero-content h1, .hero-content h2, .hero-content h3 { letter-spacing: -0.01em; }

/* testimonials: carousel */
/* 单条轮播 */
                .testimonial-list { display: flex; overflow: hidden; }
                .testimonial-list > * { flex: 0 0 100%; }

/* partners: grid-6 */
.partner-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: var(--space-gap); align-items: center; }
.partner-grid > * { border-radius: var(--radius-sm); opacity: .9; transition: opacity var(--transition), filter var(--transition); }
.partner-grid > *:hover { opacity: 1; filter: drop-shadow(0 0 18px rgba(59,130,246,.35)); }

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

/* 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; text-shadow: 0 0 26px rgba(59,130,246,.28); }
.stats-grid .stat-card, .stats-grid [class*="stat"] { border-radius: var(--radius-sm); }

/* cta: full-bg */
.cta-section { background: linear-gradient(135deg, rgba(37,99,235,1) 0%, rgba(59,130,246,1) 45%, rgba(29,78,216,1) 100%); color: #ffffff; padding: 4rem 2rem; box-shadow: 0 26px 70px rgba(37,99,235,.35); position: relative; overflow: hidden; }
.cta-section::after { content: ""; position: absolute; inset: -40% -20% auto -20%; height: 220%; background: radial-gradient(600px 320px at 35% 30%, rgba(255,255,255,.26), transparent 58%), radial-gradient(520px 260px at 70% 40%, rgba(147,197,253,.26), transparent 60%); transform: rotate(8deg); pointer-events: none; opacity: .9; }
.cta-section * { text-shadow: 0 1px 0 rgba(0,0,0,.18); }

/* 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: var(--color-accent); }
.hero, [class*="hero"], section:first-of-type { background: radial-gradient(1000px 420px at 15% 5%, rgba(37,99,235,.55), transparent 58%), radial-gradient(980px 380px at 85% 10%, rgba(59,130,246,.40), transparent 55%), linear-gradient(135deg, #0b1226 0%, #0f172a 62%, rgba(37,99,235,.10) 100%); }
header, .header, .navbar { box-shadow: 0 10px 34px rgba(2,6,23,.40), 0 1px 0 rgba(148,163,184,.16) inset; }

/* Accent glow on cards (safe, doesn't alter layout) */
.card:hover, [class*="card"]:hover {
    box-shadow: 0 16px 46px rgba(2,6,23,.45), 0 0 0 1px rgba(59,130,246,.35) inset, 0 0 32px rgba(59,130,246,.60);
    transform: translateY(-2px);
    filter: saturate(110%);
}
.card:focus-within, [class*="card"]:focus-within {
    box-shadow: 0 18px 52px rgba(2,6,23,.48), 0 0 0 1px rgba(59,130,246,.45) inset, 0 0 30px rgba(59,130,246,.52);
}

/* Subtle pulse */
@keyframes dashboardGlowPulse {
    0% { box-shadow: var(--shadow-md), 0 0 0 1px rgba(148,163,184,.12) inset, 0 0 18px rgba(59,130,246,.25); }
    50% { box-shadow: 0 12px 34px rgba(2,6,23,.36), 0 0 0 1px rgba(59,130,246,.26) inset, 0 0 28px rgba(59,130,246,.50); }
    100% { box-shadow: var(--shadow-md), 0 0 0 1px rgba(148,163,184,.12) inset, 0 0 18px rgba(59,130,246,.25); }
}
.card, [class*="card"] { animation: dashboardGlowPulse 5.5s ease-in-out infinite; }

/* 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: 0.95rem; --space-gap: 0.65rem; --grid-card-radius: 12px; }
    .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; }
    .card, [class*="card"] { animation-duration: 6.8s; }
}