:root {
    --color-primary: #5b21b6;
    --color-primary-dark: #3b166c;
    --color-accent: #22c55e;
    --color-surface: #f7f3ff;
    --color-text: #0f172a;
    --rgb-primary: 91,33,182;
    --rgb-accent: 34,197,94;
    --radius-sm: 3px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 22px;
    --shadow-sm: 0 2px 6px rgba(2, 6, 23, 0.10), 0 1px 0 rgba(255, 255, 255, 0.55) inset;
    --shadow-md: 0 6px 14px rgba(2, 6, 23, 0.08), 0 22px 48px -18px rgba(2, 6, 23, 0.16);
    --shadow-lg: 0 10px 26px -10px rgba(2, 6, 23, 0.18), 0 24px 56px -18px rgba(91, 33, 182, 0.18), 0 2px 0 rgba(255,255,255,0.65) inset;
    --space-section: 4rem;
    --space-card: 1.5rem;
    --space-gap: 1.25rem;
    --transition: 0.38s cubic-bezier(.2,.9,.2,1);
    --heading-weight: 800;
    --body-line-height: 1.7;
}

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-xl);
    box-shadow:
        0 4px 10px rgba(2, 6, 23, 0.06),
        0 18px 40px -18px rgba(2, 6, 23, 0.18),
        0 2px 0 rgba(255, 255, 255, 0.7) inset;
    padding: var(--space-card);
    transition: var(--transition);
    background: linear-gradient(180deg, rgba(255,255,255,0.78), rgba(255,255,255,0.55));
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-lg);
    transition: var(--transition);
    border-color: rgba(91, 33, 182, 0.35);
}
a:not([class]) {
    color: var(--color-primary);
    transition: var(--transition);
    text-shadow: 0 1px 0 rgba(255,255,255,0.55);
}

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

/* news: grid-3 */
/* 三列等宽网格 */
                .news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }

/* features: horizontal */
/* 水平滚动 */
                .feature-list { display: flex; gap: var(--space-gap); overflow-x: auto; scroll-snap-type: x mandatory; }
                .feature-list > * { flex: 0 0 300px; scroll-snap-align: start; }

/* 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; }

/* 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 20s linear infinite; }
                @keyframes partnerScroll { 0% { transform: translateX(0); } 100% { transform: translateX(-50%); } }

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

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

/* cta: centered */
.cta-inner { text-align: center; max-width: 700px; margin: 0 auto; }

/* 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); text-shadow: 0 0 18px rgba(34, 197, 94, 0.25); }
.hero, [class*="hero"], section:first-of-type {
    background:
        radial-gradient(1200px 500px at 10% 15%, rgba(34,197,94,0.30), rgba(34,197,94,0) 55%),
        radial-gradient(900px 420px at 85% 25%, rgba(56,189,248,0.28), rgba(56,189,248,0) 60%),
        linear-gradient(135deg, #4f46e5, var(--color-primary-dark));
}
header, .header, .navbar { background: transparent; }

/* 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; }
}