:root {
    --color-primary: #a855f7;
    --color-primary-dark: #6d28d9;
    --color-accent: #fbbf24;
    --color-surface: #f5f3ff;
    --color-text: #1f1b2e;
    --rgb-primary: 168,85,247;
    --rgb-accent: 251,191,36;
    --radius-sm: 10px;
    --radius-md: 18px;
    --radius-lg: 26px;
    --radius-xl: 36px;
    --shadow-sm: 0 1px 0 rgba(0,0,0,.03);
    --shadow-md: 0 18px 40px rgba(12,10,28,.14), 0 4px 14px rgba(12,10,28,.08);
    --shadow-lg: 0 26px 70px rgba(10,8,25,.22), 0 10px 30px rgba(10,8,25,.14);
    --space-section: 5rem;
    --space-card: 2rem;
    --space-gap: 1.5rem;
    --transition: 280ms cubic-bezier(.2,.8,.2,1);
    --heading-weight: 650;
    --body-line-height: 1.75;
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: radial-gradient(900px 500px at 50% -140px, rgba(168,85,247,.18), transparent 62%), radial-gradient(700px 420px at 12% 10%, rgba(251,191,36,.12), transparent 60%), radial-gradient(900px 520px at 88% 12%, rgba(109,40,217,.10), transparent 55%); }
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 22px 50px rgba(11,8,22,.14), 0 10px 24px rgba(11,8,22,.10), inset 0 1px 0 rgba(255,255,255,.55); padding: var(--space-card); transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background var(--transition); background: linear-gradient(180deg, rgba(255,255,255,.86), rgba(245,243,255,.78)); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: transform var(--transition), box-shadow var(--transition), background var(--transition), border-color var(--transition), color var(--transition), filter var(--transition); }
a:not([class]) { color: var(--color-primary); transition: color var(--transition), text-shadow var(--transition), opacity var(--transition); text-shadow: 0 1px 0 rgba(0,0,0,.06); }

/* ========== 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: centered */
.hero-content { text-align: center; max-width: 800px; margin: 0 auto; }

/* testimonials: stacked */
/* 垂直堆叠 */
                .testimonial-list { display: flex; flex-direction: column; gap: var(--space-gap); max-width: 720px; margin: 0 auto; }

/* partners: grid-6 */
.partner-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: var(--space-gap); align-items: center; }

/* 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: 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 */
.card:hover, [class*="card"]:hover { transform: translateY(-6px); box-shadow: 0 30px 90px rgba(10,6,22,.24), 0 12px 36px rgba(10,6,22,.16), inset 0 1px 0 rgba(255,255,255,.65); }
.hero, [class*="hero"], section:first-of-type { background: radial-gradient(1100px 460px at 50% -80px, rgba(251,191,36,.22), transparent 60%), radial-gradient(980px 420px at 10% 10%, rgba(168,85,247,.22), transparent 62%), linear-gradient(135deg, #0f0f1a, #20104b 55%, #0f0f1a); box-shadow: inset 0 1px 0 rgba(255,255,255,.06); }
.card { border-left: 3px solid var(--color-accent); background-clip: padding-box; }
header, .header, .navbar { box-shadow: 0 14px 40px rgba(0,0,0,.14), 0 3px 10px rgba(0,0,0,.08), inset 0 1px 0 rgba(255,255,255,.08); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.10); }

/* 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; --radius-sm: 12px; --radius-md: 16px; --radius-lg: 22px; --radius-xl: 30px; }
    .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; }
}