:root {
    --color-primary: #3b82f6;
    --color-primary-dark: #1d4ed8;
    --color-accent: #60a5fa;
    --color-surface: #f8fbff;
    --color-text: #1e293b;
    --rgb-primary: 59,130,246;
    --rgb-accent: 96,165,250;
    --radius-sm: 10px;
    --radius-md: 12px;
    --radius-lg: 14px;
    --radius-xl: 16px;
    --shadow-sm: 0 1px 2px rgba(15,23,42,.08), 0 0 12px rgba(59,130,246,.12);
    --shadow-md: 0 8px 20px rgba(15,23,42,.14), 0 0 24px rgba(59,130,246,.18);
    --shadow-lg: 0 16px 36px rgba(15,23,42,.18), 0 0 32px rgba(59,130,246,.24);
    --space-section: 3rem;
    --space-card: 1.25rem;
    --space-gap: 1rem;
    --transition: 0.24s 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: linear-gradient(180deg, #1e293b 0%, #334155 100%); caret-color: var(--color-primary); }
h1, h2, h3, h4 { font-weight: var(--heading-weight); color: #f8fafc; text-shadow: 0 1px 0 rgba(15,23,42,.25); }
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: linear-gradient(180deg, #ffffff 0%, #f8fbff 100%); border-color: rgba(var(--rgb-primary), .18); border-style: solid; backdrop-filter: blur(10px); }
.card:hover, [class*="card"]:hover { box-shadow: 0 12px 28px rgba(15,23,42,.18), 0 0 32px rgba(59,130,246,.34); filter: saturate(1.03); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); box-shadow: 0 6px 16px rgba(15,23,42,.16), 0 0 18px rgba(59,130,246,.22); outline-color: rgba(var(--rgb-primary), .35); accent-color: var(--color-primary); }
.btn:hover, button[class*="btn"]:hover, a[class*="btn"]:hover { box-shadow: 0 10px 22px rgba(15,23,42,.2), 0 0 32px rgba(59,130,246,.6); }
a:not([class]) { color: var(--color-primary); transition: var(--transition); text-decoration-color: rgba(var(--rgb-primary), .35); text-shadow: 0 0 10px rgba(59,130,246,.12); }

/* ========== 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); }

/* features: horizontal */
/* 水平滚动 */
                .feature-list { display: flex; gap: var(--space-gap); overflow-x: auto; scroll-snap-type: x mandatory; }
                .feature-list > * { flex: 0 0 300px; scroll-snap-align: start; }

/* hero: split */
/* 左文右图 */
                .hero-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; align-items: center; }

/* testimonials: grid-3 */
.testimonial-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }

/* partners: centered */
.partner-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 2rem; }

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

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

/* cta: card-style */
.cta-inner { background: linear-gradient(135deg, #f8fbff 0%, #e0f2fe 100%); border-radius: var(--radius-xl); padding: 3rem; text-align: center; box-shadow: 0 18px 40px rgba(15,23,42,.2), 0 0 30px rgba(59,130,246,.28); border-color: rgba(var(--rgb-primary), .2); border-style: solid; }

/* Page Layout: full-width */
/* 无侧边栏, 全宽 */
            .page-main { max-width: 1200px; margin: 0 auto; }

/* 条件性装饰 */
a:not([class]):hover { color: var(--color-accent); text-shadow: 0 0 14px rgba(96,165,250,.28); }
.card { border: 1px solid rgba(var(--rgb-primary), .14); }
header, .header, .navbar { box-shadow: 0 8px 22px rgba(15,23,42,.18), 0 0 24px rgba(59,130,246,.18); background: rgba(30,41,59,.9); backdrop-filter: blur(14px); border-color: rgba(148,163,184,.16); 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; }
}