: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: 16px;
    --shadow-sm: 0 1px 0 rgba(15, 23, 42, 0.06), 0 8px 22px rgba(2, 6, 23, 0.06);
    --shadow-md: 0 1px 0 rgba(15, 23, 42, 0.08), 0 10px 28px rgba(2, 6, 23, 0.12);
    --shadow-lg: 0 1px 0 rgba(15, 23, 42, 0.10), 0 18px 44px rgba(2, 6, 23, 0.18), 0 0 30px rgba(59, 130, 246, 0.18);
    --space-section: 2rem;
    --space-card: 1rem;
    --space-gap: 0.75rem;
    --transition: 220ms cubic-bezier(0.2, 0.8, 0.2, 1);
    --heading-weight: 700;
    --body-line-height: 1.6;
}

body { 
    color: var(--color-text);
    line-height: var(--body-line-height);
    background: radial-gradient(1200px 600px at 20% 0%, rgba(59, 130, 246, 0.10), transparent 60%),
                radial-gradient(900px 520px at 90% 15%, rgba(96, 165, 250, 0.10), transparent 55%),
                linear-gradient(180deg, #0b1222 0%, #0f172a 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: var(--transition);
    background: linear-gradient(180deg, rgba(248, 250, 252, 0.96), rgba(248, 250, 252, 0.90));
    border: 1px solid rgba(148, 163, 184, 0.22);
    outline: 1px solid rgba(59, 130, 246, 0);
    outline-offset: -1px;
}

.btn, button[class*="btn"], a[class*="btn"] { 
    border-radius: var(--radius-md);
    transition: var(--transition);
}

a:not([class]) { 
    color: var(--color-primary);
    transition: var(--transition);
    text-shadow: 0 0 0 rgba(0,0,0,0);
}

:focus { outline: 2px solid rgba(59, 130, 246, 0.55); outline-offset: 3px; }

.card:hover, [class*="card"]:hover { 
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg), 0 0 32px rgba(59, 130, 246, 0.35);
    outline-color: rgba(96, 165, 250, 0.55);
}

header, .header, .navbar { background: transparent; }

@keyframes partnerScroll { 
    0% { transform: translateX(0); } 
    100% { transform: translateX(-50%); } 
}

@keyframes dashGlowPulse {
    0% { filter: drop-shadow(0 0 0 rgba(59, 130, 246, 0)); opacity: 0.92; }
    55% { filter: drop-shadow(0 0 18px rgba(59, 130, 246, 0.35)); opacity: 1; }
    100% { filter: drop-shadow(0 0 0 rgba(59, 130, 246, 0)); opacity: 0.95; }
}

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

/* news: featured-top */
/* 首篇横跨全宽 */
                .news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }
                .news-grid > *:first-child { grid-column: span 3; }

/* features: grid-2 */
.feature-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: calc(var(--space-gap) * 1.5); }

/* hero: split */
/* 左文右图 */
                .hero-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; align-items: center; }

/* 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 18s linear infinite; }
                .partner-grid > * { animation: dashGlowPulse 2.4s ease-in-out infinite; animation-delay: 0s; }

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

/* stats: grid-4 */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); text-align: center; }

/* cta: full-bg */
.cta-section { 
    background: radial-gradient(900px 420px at 10% 20%, rgba(96, 165, 250, 0.35), transparent 55%),
                radial-gradient(760px 420px at 85% 30%, rgba(59, 130, 246, 0.40), transparent 60%),
                linear-gradient(135deg, var(--color-primary) 0%, #0b4bd6 55%, #0a2a66 100%);
    color: rgba(255,255,255,0.92); 
    padding: 4rem 2rem;
    box-shadow: 0 24px 80px rgba(2, 6, 23, 0.40), 0 0 46px rgba(59, 130, 246, 0.28);
    border-top: 1px solid rgba(147, 197, 253, 0.35);
}

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

/* 条件性装饰 */
/* 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; }
}