:root {
    --color-primary: #a855f7;
    --color-primary-dark: #6d28d9;
    --color-accent: #f59e0b;
    --color-surface: #0ea5e9;
    --color-text: #e9e9ff;
    --rgb-primary: 168,85,247;
    --rgb-accent: 245,158,11;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 18px;
    --radius-xl: 26px;
    --shadow-sm: 0 10px 20px rgba(0,0,0,.16);
    --shadow-md: 0 18px 44px rgba(0,0,0,.28), 0 2px 0 rgba(255,255,255,.06) inset, 0 -1px 0 rgba(255,255,255,.04) inset;
    --shadow-lg: 0 30px 75px rgba(0,0,0,.38), 0 10px 25px rgba(109,40,217,.18), 0 1px 0 rgba(255,255,255,.08) inset;
    --space-section: 3.25rem;
    --space-card: 1.35rem;
    --space-gap: 1.2rem;
    --transition: 520ms cubic-bezier(0.16, 1, 0.3, 1);
    --heading-weight: 650;
    --body-line-height: 1.8;
}

body { 
    color: var(--color-text); 
    line-height: var(--body-line-height);
    background: radial-gradient(1200px 600px at 50% -200px, rgba(168,85,247,.35), rgba(15,15,26,0) 55%), 
                radial-gradient(900px 500px at 15% 20%, rgba(245,158,11,.18), rgba(15,15,26,0) 52%),
                radial-gradient(900px 500px at 85% 35%, rgba(14,165,233,.14), rgba(15,15,26,0) 55%),
                #0f0f1a;
}

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 26px 70px rgba(0,0,0,.42),
        0 10px 26px rgba(168,85,247,.18),
        0 2px 0 rgba(255,255,255,.07) inset,
        0 -1px 0 rgba(255,255,255,.05) inset;
    padding: var(--space-card); 
    transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition), background var(--transition), color var(--transition);
    border-color: rgba(var(--rgb-primary), .18);
    background: linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.03));
}

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

a:not([class]) { 
    color: var(--color-accent); 
    transition: var(--transition); 
    text-shadow: 0 0 18px rgba(245,158,11,.18);
}

a:not([class]):hover { color: var(--color-primary); }

/* ========== 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-4 */
.feature-list { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); }

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

/* testimonials: grid-3 */
.testimonial-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }

/* partners: grid-4 */
.partner-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: calc(var(--space-gap) * 1.5); align-items: center; }

/* faq: with-sidebar */
/* FAQ 左 + 联系信息右 */
                .faq-wrapper { display: grid; grid-template-columns: 2fr 1fr; gap: 2rem; }

/* 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; }

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

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

/* 条件性装饰 */
.hero, [class*="hero"], section:first-of-type { 
    background: radial-gradient(900px 420px at 50% 0%, rgba(245,158,11,.22), rgba(15,15,26,0) 60%),
                linear-gradient(135deg, rgba(168,85,247,.95) 0%, rgba(109,40,217,.9) 45%, rgba(14,165,233,.22) 100%);
    box-shadow: inset 0 1px 0 rgba(255,255,255,.06);
    border-bottom: 1px solid rgba(var(--rgb-primary), .12);
}
.card { 
    border: 1px solid rgba(var(--rgb-primary), .22);
}

header, .header, .navbar { 
    box-shadow: 0 18px 55px rgba(0,0,0,.32), 0 2px 0 rgba(255,255,255,.06) inset;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    background: linear-gradient(180deg, rgba(15,15,26,.72), rgba(15,15,26,.55));
    border-bottom: 1px solid rgba(168,85,247,.16);
}

/* 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: 2.15rem; --space-card: 1.05rem; --space-gap: 0.85rem; }
    .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; }
}