:root {
    --color-primary: #5b21b6;
    --color-primary-dark: #3b0764;
    --color-accent: #06b6d4;
    --color-surface: #f1f4ff;
    --color-text: #14121f;
    --rgb-primary: 91,33,182;
    --rgb-accent: 6,182,212;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --shadow-sm: 0 0 0 1px rgba(var(--rgb-primary), .07), 0 1px 2px rgba(20,18,31,.08);
    --shadow-md: 0 0 16px rgba(var(--rgb-accent), .22), 0 6px 16px -4px rgba(59,7,100,.28);
    --shadow-lg: 0 0 34px rgba(var(--rgb-accent), .5), 0 14px 30px -8px rgba(59,7,100,.35);
    --space-section: 2rem;
    --space-card: 1rem;
    --space-gap: 0.75rem;
    --transition: 0.35s cubic-bezier(0.22, 1, 0.36, 1);
    --heading-weight: 700;
    --body-line-height: 1.75;
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background-color: var(--color-surface); caret-color: var(--color-accent); accent-color: var(--color-accent); }
h1, h2, h3, h4 { font-weight: var(--heading-weight); text-shadow: 0 0 22px rgba(var(--rgb-accent), .28), 0 1px 0 rgba(59,7,100,.14); }
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: var(--transition); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); box-shadow: 0 0 14px rgba(var(--rgb-accent), .38), inset 0 0 0 1px rgba(var(--rgb-accent), .45); }
a:not([class]) { color: var(--color-primary); transition: var(--transition); text-decoration-color: rgba(var(--rgb-accent), .55); }

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

/* news: grid-4 */
/* 四列紧凑网格 */
                .news-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: calc(var(--space-gap) * 0.8); }

/* features: grid-3 */
.feature-list { display: grid; grid-template-columns: repeat(3, 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: inline */
/* 水平排列 */
                .stats-grid { display: flex; justify-content: center; gap: 3rem; }

/* cta: full-bg */
.cta-section { background: radial-gradient(circle at 12% 18%, rgba(6,182,212,.42), transparent 58%), linear-gradient(135deg, #3b0764 0%, #6d28d9 58%, #0e7490 100%); color: #f4feff; padding: 4rem 2rem; box-shadow: 0 0 70px rgba(var(--rgb-accent), .3); }

/* 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(-4px); box-shadow: 0 0 38px rgba(var(--rgb-accent), .58), 0 18px 34px -10px rgba(59,7,100,.4); }
a:not([class]):hover { color: var(--color-accent); }
.card { border: 1px solid rgba(var(--rgb-accent), .5); }
header, .header, .navbar { background: transparent; box-shadow: 0 1px 0 rgba(var(--rgb-accent), .28), 0 0 26px rgba(var(--rgb-accent), .18); }

/* 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; }
}