:root {
    --color-primary: #0ea5e9;
    --color-primary-dark: #0369a1;
    --color-accent: #34d399;
    --color-surface: #f0fdf4;
    --color-text: #052e2b;

    --rgb-primary: 14,165,233;
    --rgb-accent: 52,211,153;

    --radius-sm: 10px;
    --radius-md: 18px;
    --radius-lg: 26px;
    --radius-xl: 34px;

    --shadow-sm: 0 1px 0 rgba(3,105,161,.10), 0 10px 20px rgba(2,132,199,.10);
    --shadow-md:
        0 1px 0 rgba(2,132,199,.10),
        -2px 10px 24px rgba(2,132,199,.14),
        0 2px 10px rgba(5,46,43,.08);
    --shadow-lg:
        -3px 14px 34px rgba(3,105,161,.18),
        0 10px 26px rgba(5,46,43,.10),
        0 2px 0 rgba(52,211,153,.08);

    --space-section: 5rem;
    --space-card: 2rem;
    --space-gap: 1.5rem;

    --transition: 520ms cubic-bezier(0.18, 0.9, 0.22, 1);
    --heading-weight: 900;
    --body-line-height: 1.7;
}

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(3,105,161,.10),
        0 18px 40px rgba(2,132,199,.14),
        0 2px 14px rgba(5,46,43,.10),
        inset 0 1px 0 rgba(255,255,255,.40);
    padding: var(--space-card);
    transition: transform 520ms cubic-bezier(0.18, 0.9, 0.22, 1), box-shadow 520ms cubic-bezier(0.18, 0.9, 0.22, 1), background-color 520ms cubic-bezier(0.18, 0.9, 0.22, 1), border-color 520ms cubic-bezier(0.18, 0.9, 0.22, 1);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: transform 520ms cubic-bezier(0.18, 0.9, 0.22, 1), box-shadow 520ms cubic-bezier(0.18, 0.9, 0.22, 1), background-color 520ms cubic-bezier(0.18, 0.9, 0.22, 1), color 520ms cubic-bezier(0.18, 0.9, 0.22, 1), border-color 520ms cubic-bezier(0.18, 0.9, 0.22, 1);
}
a:not([class]) { color: var(--color-primary); transition: var(--transition); }
a:not([class]):hover { color: var(--color-accent); text-shadow: 0 10px 30px rgba(52,211,153,.18); }

.card:hover, [class*="card"]:hover {
    transform: translateY(-5px);
    box-shadow:
        -2px 22px 54px rgba(3,105,161,.20),
        0 16px 34px rgba(2,132,199,.16),
        0 2px 16px rgba(5,46,43,.12),
        inset 0 1px 0 rgba(255,255,255,.45);
    border-color: rgba(var(--rgb-primary), .24);
}

.hero, [class*="hero"], section:first-of-type {
    background:
        radial-gradient(1200px 600px at 10% 10%, rgba(52,211,153,.35) 0%, rgba(52,211,153,0) 55%),
        radial-gradient(900px 500px at 90% 20%, rgba(14,165,233,.35) 0%, rgba(14,165,233,0) 58%),
        linear-gradient(135deg, rgba(14,165,233,.95), rgba(3,105,161,.92));
    border-bottom: 1px solid rgba(255,255,255,.14);
}

.card { border: 1px solid rgba(var(--rgb-primary), .16); }
header, .header, .navbar {
    box-shadow:
        0 1px 0 rgba(255,255,255,.40),
        0 10px 28px rgba(2,132,199,.12),
        0 2px 14px rgba(5,46,43,.10);
    border-bottom: 1px solid rgba(2,132,199,.14);
}

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

/* news: grid-4 */
/* 四列紧凑网格 */
                .news-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: calc(var(--space-gap) * 0.85); }

/* features: grid-2 */
.feature-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: calc(var(--space-gap) * 1.6); }

/* hero: centered */
.hero-content { text-align: center; max-width: 800px; margin: 0 auto; }

/* testimonials: carousel */
/* 单条轮播 */
                .testimonial-list { display: flex; overflow: hidden; } 
                .testimonial-list > * { flex: 0 0 100%; }

/* partners: scroll */
/* 自动滚动 */
                .partner-grid { display: flex; gap: 2rem; overflow: hidden; animation: partnerScroll 22s cubic-bezier(0.2, 0.8, 0.2, 1) 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: 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; }

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

/* 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; }
}