:root {
    --color-primary: #5c49f5;
    --color-primary-dark: #2f1f9e;
    --color-accent: #ff8a3d;
    --color-surface: #f4f5f7;
    --color-text: #1f2433;
    --rgb-primary: 92,73,245;
    --rgb-accent: 255,138,61;
    --radius-sm: 3px;
    --radius-md: 5px;
    --radius-lg: 6px;
    --radius-xl: 10px;
    --shadow-sm: 0 2px 6px rgba(31,36,51,0.08), 0 1px 0 rgba(255,255,255,0.7) inset;
    --shadow-md: 0 10px 24px rgba(92,73,245,0.12), 0 3px 10px rgba(31,36,51,0.08), 0 1px 0 rgba(255,255,255,0.75) inset;
    --shadow-lg: 0 16px 34px rgba(92,73,245,0.18), 0 8px 18px rgba(255,138,61,0.12), 0 1px 0 rgba(255,255,255,0.85) inset;
    --space-section: 5rem;
    --space-card: 2rem;
    --space-gap: 1.5rem;
    --transition: 0.28s cubic-bezier(0.22, 1, 0.36, 1);
    --heading-weight: 600;
    --body-line-height: 1.6;
}

body { color: var(--color-text); line-height: var(--body-line-height); background: linear-gradient(180deg, #eef1f6 0%, #f8f9fb 52%, #eef2f8 100%); caret-color: var(--color-primary); accent-color: var(--color-accent); }
h1, h2, h3, h4 { font-weight: var(--heading-weight); color: #171c2b; text-shadow: 0 1px 0 rgba(255,255,255,0.7); }
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: box-shadow var(--transition), border-color var(--transition), background var(--transition), color var(--transition), filter var(--transition), opacity var(--transition), transform var(--transition); background: linear-gradient(145deg, rgba(255,255,255,0.96) 0%, rgba(244,247,252,0.94) 100%); border-color: rgba(var(--rgb-primary), .18); border-style: solid; backdrop-filter: blur(8px) saturate(1.08); filter: saturate(1.02); opacity: 0.98; }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: background var(--transition), color var(--transition), box-shadow var(--transition), border-color var(--transition), filter var(--transition); background: linear-gradient(135deg, #5c49f5 0%, #7e6bff 100%); color: #ffffff; border-color: rgba(47,31,158,0.35); border-style: solid; box-shadow: 0 8px 18px rgba(92,73,245,0.2), 0 1px 0 rgba(255,255,255,0.28) inset; text-shadow: 0 1px 0 rgba(47,31,158,0.35); }
a:not([class]) { color: var(--color-primary); transition: color var(--transition), text-shadow var(--transition), opacity var(--transition); text-shadow: 0 1px 0 rgba(255,255,255,0.65); }

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

/* news: masonry-2 */
/* 两列瀑布流 */
                .news-grid { column-count: 2; column-gap: var(--space-gap); }
                .news-grid .card { break-inside: avoid; margin-bottom: var(--space-gap); background: linear-gradient(145deg, rgba(255,255,255,0.98) 0%, rgba(238,244,255,0.95) 100%); border-color: rgba(92,73,245,0.2); box-shadow: 0 12px 26px rgba(92,73,245,0.1), 0 4px 10px rgba(31,36,51,0.07); }

/* features: grid-4 */
.feature-list { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); }

/* hero: overlay */
/* 全屏背景+文字覆盖 */
                .hero { position: relative; min-height: 70vh; display: flex; align-items: center; background: radial-gradient(circle at 18% 22%, rgba(255,138,61,0.24) 0%, rgba(255,138,61,0) 34%), radial-gradient(circle at 82% 18%, rgba(92,73,245,0.22) 0%, rgba(92,73,245,0) 36%), linear-gradient(135deg, #f6f2ec 0%, #eef2f8 54%, #e7ebf5 100%); }
                .hero-content { position: relative; z-index: 1; color: #171c2b; text-shadow: 0 2px 10px rgba(255,255,255,0.35); }

/* 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-4 */
.partner-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: calc(var(--space-gap) * 1.5); align-items: center; }

/* faq: single-column */
.faq-list { max-width: 800px; margin: 0 auto; }

/* stats: inline */
/* 水平排列 */
                .stats-grid { display: flex; justify-content: center; gap: 3rem; }

/* cta: centered */
.cta-inner { text-align: center; max-width: 700px; margin: 0 auto; background: linear-gradient(135deg, rgba(92,73,245,0.08) 0%, rgba(255,138,61,0.08) 100%); border-radius: var(--radius-xl); box-shadow: 0 14px 28px rgba(31,36,51,0.06), 0 1px 0 rgba(255,255,255,0.85) inset; }

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

/* 条件性装饰 */
.card:hover, [class*="card"]:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); filter: saturate(1.06) brightness(1.01); opacity: 1; }
.card { border: 1px dashed rgba(var(--rgb-primary), .18); }
header, .header, .navbar { background: linear-gradient(180deg, rgba(244,245,247,0.82) 0%, rgba(244,245,247,0.58) 100%); backdrop-filter: blur(10px) saturate(1.12); box-shadow: 0 10px 24px rgba(31,36,51,0.05); border-color: rgba(92,73,245,0.12); border-style: solid; }

/* 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; }
}