:root {
    --color-primary: #7c3aed;
    --color-primary-dark: #5b21b6;
    --color-accent: #22c55e;
    --color-surface: #ecfeff;
    --color-text: #0f172a;
    --rgb-primary: 124,58,237;
    --rgb-accent: 34,197,94;

    --radius-sm: 10px;
    --radius-md: 16px;
    --radius-lg: 22px;
    --radius-xl: 28px;

    --shadow-sm:
        0 1px 0 rgba(15,23,42,.05),
        0 6px 14px rgba(124,58,237,.10);
    --shadow-md:
        0 2px 0 rgba(15,23,42,.04),
        0 10px 22px rgba(124,58,237,.14),
        0 1px 0 rgba(255,255,255,.55) inset;
    --shadow-lg:
        0 4px 0 rgba(15,23,42,.05),
        0 18px 40px rgba(124,58,237,.18),
        0 2px 0 rgba(255,255,255,.62) inset,
        0 0 0 1px rgba(124,58,237,.10);

    --space-section: 5rem;
    --space-card: 2rem;
    --space-gap: 1.5rem;

    --transition: 420ms cubic-bezier(0.16, 1, 0.3, 1);
    --heading-weight: 600;
    --body-line-height: 1.6;
}

/* 基础覆盖 */
body {
    color: var(--color-text);
    line-height: var(--body-line-height);
    background: radial-gradient(1000px 600px at 15% 0%, rgba(var(--rgb-primary),.10), rgba(255,255,255,0) 55%),
                radial-gradient(900px 500px at 85% 10%, rgba(34,197,94,.10), rgba(255,255,255,0) 52%),
                linear-gradient(180deg, #f8fafc, #ffffff);
    caret-color: var(--color-primary);
}
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: transform var(--transition), box-shadow var(--transition), background-color var(--transition), border-color var(--transition), filter var(--transition);
    background: linear-gradient(180deg, rgba(255,255,255,.92), rgba(255,255,255,.75));
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: transform var(--transition), box-shadow var(--transition), background-color var(--transition), border-color var(--transition), filter var(--transition);
}
a:not([class]) {
    color: var(--color-primary);
    transition: var(--transition);
    text-shadow: 0 0 0 rgba(0,0,0,0);
}
.news-grid, .feature-list, .hero-content, .testimonial-list, .partner-grid, .faq-list, .stats-grid, .cta-inner { color: inherit; }

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

/* testimonials: masonry */
.testimonial-list { column-count: 2; column-gap: var(--space-gap); }
                .testimonial-list > * { break-inside: avoid; margin-bottom: 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: 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 6px 0 rgba(15,23,42,.04),
        0 22px 56px rgba(124,58,237,.22),
        0 2px 0 rgba(255,255,255,.70) inset,
        0 0 0 1px rgba(124,58,237,.14);
    filter: saturate(1.03);
}
.hero, [class*="hero"], section:first-of-type {
    background:
        radial-gradient(900px 520px at 12% 18%, rgba(124,58,237,.50), rgba(124,58,237,0) 56%),
        radial-gradient(840px 480px at 88% 22%, rgba(34,197,94,.45), rgba(34,197,94,0) 58%),
        linear-gradient(135deg, #6d28d9, #0ea5e9);
    color: rgba(255,255,255,.94);
    border-color: rgba(255,255,255,.20);
}
.card { border: 1px solid rgba(var(--rgb-primary), .14); }
header, .header, .navbar {
    box-shadow:
        0 1px 0 rgba(255,255,255,.6) inset,
        0 10px 30px rgba(2,6,23,.10),
        0 2px 0 rgba(2,6,23,.03);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-color: rgba(255,255,255,.22);
}

/* 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; }
}