:root {
    --color-primary: #4f46e5;
    --color-primary-dark: #312e81;
    --color-accent: #ec4899;
    --color-surface: #f5f5f8;
    --color-text: #1c1c26;
    --rgb-primary: 79,70,229;
    --rgb-accent: 236,72,153;
    --accent-news: #2563eb;
    --accent-feature: #7c3aed;
    --accent-quote: #db2777;
    --accent-partner: #0891b2;
    --accent-faq: #ea580c;
    --accent-stat: #16a34a;
    --accent-cta: #e11d48;
    --radius-sm: 2px;
    --radius-md: 3px;
    --radius-lg: 5px;
    --radius-xl: 6px;
    --shadow-sm: 0 1px 2px rgba(28,28,38,.06), 0 0 0 1px rgba(28,28,38,.05);
    --shadow-md: 0 1px 2px rgba(28,28,38,.05), 0 4px 12px -6px rgba(79,70,229,.22);
    --shadow-lg: 0 2px 4px rgba(28,28,38,.06), 0 16px 32px -16px rgba(79,70,229,.32);
    --space-section: 2.6rem;
    --space-card: 1rem;
    --space-gap: 0.875rem;
    --transition: 0.28s cubic-bezier(0.22, 0.61, 0.36, 1);
    --heading-weight: 700;
    --body-line-height: 1.7;
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background-color: #f5f5f8; }
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: var(--transition); background-color: #ffffff; }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); accent-color: var(--color-primary); }
a:not([class]) { color: var(--color-primary); transition: var(--transition); caret-color: var(--color-accent); }

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

/* news: list-view */
/* 列表模式 (图左文右) */
                .news-grid { display: flex; flex-direction: column; gap: var(--space-gap); }
                .news-grid .card { display: grid; grid-template-columns: 280px 1fr; background-color: #ffffff; background-image: linear-gradient(180deg, #ffffff 0%, #eef3ff 100%); box-shadow: var(--shadow-sm), inset 3px 0 0 0 var(--accent-news); }

/* features: centered */
/* 居中大卡片 */
                .feature-list { display: flex; flex-direction: column; align-items: center; gap: calc(var(--space-gap) * 2); max-width: 720px; margin: 0 auto; }

/* hero: minimal */
.hero { padding: 1.75rem 0; background-image: linear-gradient(180deg, rgba(79,70,229,.08) 0%, rgba(79,70,229,0) 100%); } .hero-content { max-width: 560px; }

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

/* partners: scroll */
/* 自动滚动 */
                .partner-grid { display: flex; gap: 1.75rem; overflow: hidden; animation: partnerScroll 22s linear infinite; }
                @keyframes partnerScroll { 0% { transform: translateX(0); } 100% { transform: translateX(-50%); } }

/* faq: two-column */
.faq-list { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-gap); }

/* stats: grid-3 */
.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); text-align: center; }

/* cta: card-style */
.cta-inner { background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 48%, #e11d48 100%); border-radius: var(--radius-xl); padding: 2.6rem; text-align: center; color: #ffffff; box-shadow: var(--shadow-lg); }

/* Page Layout: wide */
/* 超宽 */
            .page-main { max-width: 1400px; margin: 0 auto; }

/* 条件性装饰 */
a:not([class]):hover { color: var(--color-accent); }
header, .header, .navbar { box-shadow: 0 1px 0 rgba(28,28,38,.05), 0 6px 18px -10px rgba(79,70,229,.35); }

/* 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: 0.85rem; --space-gap: 0.7rem; }
    .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; }
}