:root {
    --color-primary: #0ea5e9;
    --color-primary-dark: #0369a1;
    --color-accent: #a78bfa;
    --color-surface: #ecfeff;
    --color-text: #0b1220;
    --rgb-primary: 14,165,233;
    --rgb-accent: 167,139,250;
    --radius-sm: 0;
    --radius-md: 8px;
    --radius-lg: 14px;
    --radius-xl: 18px;
    --shadow-sm: 0 1px 0 rgba(2, 6, 23, .06), 0 10px 22px rgba(2, 132, 199, .10);
    --shadow-md: 0 2px 10px rgba(2, 6, 23, .10), 0 10px 28px rgba(14, 165, 233, .14), 0 1px 0 rgba(255,255,255,.45) inset;
    --shadow-lg: 0 10px 30px rgba(2, 6, 23, .14), 0 26px 60px rgba(14, 165, 233, .16), 0 -1px 0 rgba(255,255,255,.40) inset;
    --space-section: 5rem;
    --space-card: 2rem;
    --space-gap: 1.5rem;
    --transition: 0.55s cubic-bezier(0.16, 1, 0.3, 1);
    --heading-weight: 650;
    --body-line-height: 1.6;
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); }
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: 0 1px 0 rgba(255,255,255,.7) inset, 0 12px 26px rgba(2, 6, 23, .12), 0 20px 45px rgba(14, 165, 233, .14); padding: var(--space-card); transition: var(--transition); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); }
a:not([class]) { color: var(--color-primary); transition: var(--transition); text-shadow: 0 1px 0 rgba(255,255,255,.45); }

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

/* news: grid-3 */
/* 三列等宽网格 */
                .news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 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; background-image: radial-gradient(1000px 220px at 10% 0%, rgba(14, 165, 233, .16), transparent 55%), radial-gradient(900px 220px at 90% 100%, rgba(167, 139, 250, .14), transparent 52%); }
                .feature-list > * { flex: 0 0 300px; scroll-snap-align: start; }

/* hero: minimal */
.hero { padding: 2rem 0; } .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: grid-4 */
.partner-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: calc(var(--space-gap) * 1.5); align-items: center; }
.partner-grid { background-image: linear-gradient(180deg, rgba(14,165,233,.10), rgba(236,254,255,.0) 60%); border-radius: calc(var(--radius-xl) + 4px); padding: 0.01px; }

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

/* stats: big-number */
/* 大数字居中 */
                .stats-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 2rem; }
                .stats-grid .stat-value { font-size: 3rem; text-shadow: 0 1px 0 rgba(255,255,255,.6), 0 18px 40px rgba(14,165,233,.18); }

/* cta: card-style */
.cta-inner { background: linear-gradient(135deg, rgba(236,254,255,1) 0%, rgba(236,254,255,.72) 35%, rgba(239,234,255,.72) 100%), radial-gradient(900px 240px at 10% 0%, rgba(14,165,233,.22), transparent 60%), radial-gradient(700px 200px at 90% 100%, rgba(167,139,250,.20), transparent 55%); border-radius: var(--radius-xl); padding: 3rem; text-align: center; box-shadow: 0 1px 0 rgba(255,255,255,.75) inset, 0 18px 50px rgba(2,6,23,.12), 0 28px 80px rgba(14,165,233,.12); border: 1px solid rgba(3,105,161,.18); }

/* 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); text-shadow: 0 1px 0 rgba(255,255,255,.65), 0 0 18px rgba(167,139,250,.25); }
.hero, [class*="hero"], section:first-of-type { background: radial-gradient(900px 420px at 20% 0%, rgba(14,165,233,.35) 0%, rgba(14,165,233,.10) 40%, transparent 60%), radial-gradient(760px 380px at 85% 90%, rgba(167,139,250,.28) 0%, rgba(167,139,250,.08) 45%, transparent 62%), linear-gradient(135deg, rgba(3,105,161,.95) 0%, rgba(14,165,233,.88) 28%, rgba(167,139,250,.72) 100%); }
header, .header, .navbar { box-shadow: 0 1px 0 rgba(255,255,255,.55) inset, 0 10px 24px rgba(2, 6, 23, .10), 0 18px 50px rgba(14, 165, 233, .12); border-bottom: 1px solid rgba(2,132,199,.18); background-image: linear-gradient(180deg, rgba(255,255,255,.65), rgba(255,255,255,.30)); }

/* 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; border-radius: 16px; box-shadow: 0 1px 0 rgba(255,255,255,.78) inset, 0 16px 44px rgba(2,6,23,.10), 0 20px 70px rgba(14,165,233,.12); }
}