:root {
    --color-primary: #0ea5e9;
    --color-primary-dark: #0369a1;
    --color-accent: #22c55e;
    --color-surface: #ecfeff;
    --color-text: #06213a;
    --rgb-primary: 14,165,233;
    --rgb-accent: 34,197,94;
    --radius-sm: 3px;
    --radius-md: 5px;
    --radius-lg: 6px;
    --radius-xl: 10px;
    --shadow-sm: 0 1px 0 rgba(var(--rgb-primary), .25), 0 3px 10px rgba(2, 132, 199, .14);
    --shadow-md: 0 1px 0 rgba(var(--rgb-primary), .22), 0 6px 18px rgba(3, 105, 161, .16), 0 10px 28px rgba(0, 0, 0, .06);
    --shadow-lg: 0 1px 0 rgba(var(--rgb-primary), .20), 0 10px 30px rgba(2, 132, 199, .18), 0 18px 44px rgba(0, 0, 0, .08);
    --space-section: 4rem;
    --space-card: 1.5rem;
    --space-gap: 1.25rem;
    --transition: 220ms cubic-bezier(0.2, 0.85, 0.25, 1);
    --heading-weight: 800;
    --body-line-height: 1.6;
}

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 0.5px 0 rgba(14, 165, 233, .22),
        0 6px 16px rgba(2, 132, 199, .16),
        0 16px 34px rgba(3, 105, 161, .10);
    padding: var(--space-card);
    transition: var(--transition);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    box-shadow: 0 0 0 rgba(0,0,0,0);
}
a:not([class]) { color: var(--color-primary); transition: var(--transition); }

:root {
    caret-color: var(--color-accent);
    accent-color: var(--color-accent);
}

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

/* news: grid-4 */
/* 四列紧凑网格 */
                .news-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }

/* features: horizontal */
/* 水平滚动 */
                .feature-list { display: flex; gap: 12px; 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: 16px; align-items: center; }

/* testimonials: stacked */
/* 垂直堆叠 */
                .testimonial-list { display: flex; flex-direction: column; gap: 12px; max-width: 720px; margin: 0 auto; }

/* partners: centered */
.partner-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 24px; }

/* faq: two-column */
.faq-list { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }

/* stats: grid-3 */
.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; text-align: center; }

/* cta: full-bg */
.cta-section {
    background:
        radial-gradient(1200px 420px at 15% 0%, rgba(14, 165, 233, .38) 0%, rgba(14, 165, 233, .00) 60%),
        linear-gradient(135deg, #0284c7 0%, #075985 45%, #0369a1 100%);
    color: #e6fbff;
    padding: 4rem 2rem;
    border-radius: var(--radius-xl);
    box-shadow:
        0 1px 0 rgba(255,255,255,.10),
        0 18px 50px rgba(2, 132, 199, .22),
        0 26px 70px rgba(0, 0, 0, .10);
}

/* 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: #10b981; }
.hero, [class*="hero"], section:first-of-type {
    background:
        radial-gradient(900px 360px at 10% 10%, rgba(34,197,94,.25) 0%, rgba(34,197,94,0) 55%),
        linear-gradient(135deg, #0ea5e9 0%, #0369a1 55%, #0b5f91 100%);
    box-shadow:
        inset 0 0 0 1px rgba(255, 255, 255, .10),
        0 14px 40px rgba(3, 105, 161, .16);
}
.card { border: 1px solid rgba(14, 165, 233, .18); }
header, .header, .navbar {
    box-shadow:
        0 1px 0 rgba(255,255,255,.65),
        0 10px 26px rgba(2, 132, 199, .12),
        0 18px 40px rgba(0, 0, 0, .08);
    background: rgba(255,255,255,.70);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(14,165,233,.12);
}

/* 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; }
}