:root {
    --color-primary: #6d28d9;
    --color-primary-dark: #4c1d95;
    --color-accent: #f59e0b;
    --color-surface: #f8fafc;
    --color-text: #1e1b4b;
    --rgb-primary: 109,40,217;
    --rgb-accent: 245,158,11;
    --radius-sm: 2px;
    --radius-md: 4px;
    --radius-lg: 6px;
    --radius-xl: 10px;
    --shadow-sm: 0 1px 2px rgba(30,27,75,.05), 0 0 0 1px rgba(109,40,217,.05);
    --shadow-md: 0 2px 4px rgba(30,27,75,.06), 0 0 0 1px rgba(109,40,217,.08);
    --shadow-lg: 0 4px 8px rgba(30,27,75,.08), 0 0 0 1px rgba(245,158,11,.15);
    --space-section: 3.5rem;
    --space-card: 1.25rem;
    --space-gap: 1rem;
    --transition: 0.25s cubic-bezier(.4,0,.2,1);
    --heading-weight: 800;
    --body-line-height: 1.7;
}

body { background-color: var(--color-surface); color: var(--color-text); line-height: var(--body-line-height); caret-color: var(--color-primary); accent-color: var(--color-accent); }
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-md); box-shadow: inset 3px 0 0 var(--color-accent), 0 2px 4px rgba(30,27,75,.06), 0 0 0 1px rgba(109,40,217,.06); padding: var(--space-card); transition: var(--transition); background-color: #ffffff; }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-sm); transition: var(--transition); }
a:not([class]) { color: var(--color-primary); transition: var(--transition); }

/* ========== 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); background-color: #f5f3ff; border-radius: var(--radius-lg); box-shadow: inset 0 0 0 1px rgba(109,40,217,.08); }

/* features: grid-4 */
.feature-list { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); background-color: #fff7ed; border-radius: var(--radius-lg); box-shadow: inset 0 0 0 1px rgba(245,158,11,.12); }

/* hero: minimal */
.hero { padding: 1.75rem 0; background: linear-gradient(135deg, #1e1b4b 0%, #4c1d95 60%, #6d28d9 100%); color: #faf7ff; box-shadow: inset 0 -3px 0 rgba(245,158,11,.85); text-shadow: 0 1px 2px rgba(0,0,0,.12); } .hero-content { max-width: 560px; }

/* testimonials: grid-3 */
.testimonial-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); background-color: #eef2ff; border-radius: var(--radius-lg); box-shadow: inset 0 0 0 1px rgba(99,102,241,.10); }

/* partners: centered */
.partner-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 1.75rem; background-color: #fdf4ff; border-radius: var(--radius-lg); box-shadow: inset 0 0 0 1px rgba(217,70,239,.08); }

/* faq: with-sidebar */
/* FAQ 左 + 联系信息右 */
.faq-wrapper { display: grid; grid-template-columns: 2fr 1fr; gap: 1.75rem; background-color: #f1f5f9; border-radius: var(--radius-lg); box-shadow: inset 0 0 0 1px rgba(100,116,139,.10); }

/* stats: inline */
/* 水平排列 */
.stats-grid { display: flex; justify-content: center; gap: 2.5rem; background-color: #ecfdf5; border-radius: var(--radius-lg); box-shadow: inset 0 0 0 1px rgba(16,185,129,.10); }

/* cta: full-bg */
.cta-section { background: linear-gradient(120deg, #f59e0b, #ea580c); color: #fff; padding: 3.5rem 2rem; box-shadow: inset 0 -4px 0 rgba(30,27,75,.15); text-shadow: 0 1px 2px rgba(0,0,0,.15); }

/* 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(-2px); box-shadow: inset 3px 0 0 var(--color-accent), 0 4px 8px rgba(30,27,75,.08), 0 0 0 1px rgba(245,158,11,.15); }
a:not([class]):hover { color: var(--color-accent); }
.card { border: 1px solid #c4b5fd; }
header, .header, .navbar { box-shadow: 0 2px 0 #e9d5ff, 0 4px 12px rgba(30,27,75,.06); }

/* 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: 1.75rem; --space-card: 0.875rem; --space-gap: 0.625rem; }
    .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; }
}