:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-accent: #a855f7;
    --color-surface: #f5f3ff;
    --color-text: #0f172a;
    --rgb-primary: 37,99,235;
    --rgb-accent: 168,85,247;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 14px;
    --radius-xl: 18px;
    --shadow-sm: 0 1px 0 rgba(15, 23, 42, 0.06), 0 6px 18px rgba(168, 85, 247, 0.10);
    --shadow-md: 0 10px 24px rgba(2, 6, 23, 0.10), 0 2px 6px rgba(2, 6, 23, 0.06), 0 0 0 1px rgba(37, 99, 235, 0.10);
    --shadow-lg: 0 18px 44px rgba(2, 6, 23, 0.16), 0 10px 20px rgba(168, 85, 247, 0.14), 0 0 0 1px rgba(168, 85, 247, 0.22);
    --space-section: 4rem;
    --space-card: 1.5rem;
    --space-gap: 1.25rem;
    --transition: 520ms cubic-bezier(0.2, 0.9, 0.2, 1);
    --heading-weight: 800;
    --body-line-height: 1.65;
}

body { color: var(--color-text); line-height: var(--body-line-height); }
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:
        0 12px 28px rgba(2, 6, 23, 0.14),
        0 2px 10px rgba(2, 6, 23, 0.06),
        0 0 0 1px rgba(37, 99, 235, 0.14),
        0 0 0 0 rgba(168, 85, 247, 0);
    padding: var(--space-card);
    transition: var(--transition);
    background-image:
        radial-gradient(1200px 220px at 10% 0%, rgba(168, 85, 247, 0.10), transparent 55%),
        radial-gradient(900px 240px at 90% 0%, rgba(37, 99, 235, 0.10), transparent 52%);
}
.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);
}

.card:hover, [class*="card"]:hover {
    transform: translateY(-4px);
    box-shadow:
        0 20px 52px rgba(2, 6, 23, 0.18),
        0 10px 22px rgba(168, 85, 247, 0.18),
        0 0 0 1px rgba(168, 85, 247, 0.34),
        0 0 26px rgba(168, 85, 247, 0.42);
    animation: cardGlowPulse 1.4s ease-in-out infinite;
}
a:not([class]):hover { color: var(--color-accent); text-shadow: 0 0 22px rgba(168, 85, 247, 0.35); }
header, .header, .navbar {
    background: transparent;
    backdrop-filter: saturate(1.1) blur(2px);
}

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

/* hero: minimal */
.hero { padding: 2rem 0; } .hero-content { max-width: 560px; }

/* 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; }

/* faq: single-column */
.faq-list { max-width: 800px; margin: 0 auto; }

/* stats: inline */
/* 水平排列 */
                .stats-grid { display: flex; justify-content: center; gap: 3rem; }

/* cta: split */
.cta-inner { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 2rem; }

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

/* 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; }
}

@keyframes cardGlowPulse {
    0% {
        box-shadow:
            0 20px 52px rgba(2, 6, 23, 0.18),
            0 10px 22px rgba(168, 85, 247, 0.18),
            0 0 0 1px rgba(168, 85, 247, 0.34),
            0 0 20px rgba(168, 85, 247, 0.34);
    }
    50% {
        box-shadow:
            0 22px 58px rgba(2, 6, 23, 0.20),
            0 12px 26px rgba(168, 85, 247, 0.22),
            0 0 0 1px rgba(168, 85, 247, 0.44),
            0 0 34px rgba(168, 85, 247, 0.56);
    }
    100% {
        box-shadow:
            0 20px 52px rgba(2, 6, 23, 0.18),
            0 10px 22px rgba(168, 85, 247, 0.18),
            0 0 0 1px rgba(168, 85, 247, 0.34),
            0 0 20px rgba(168, 85, 247, 0.34);
    }
}