:root {
    --color-primary: #0ea5e9;
    --color-primary-dark: #0284c7;
    --color-accent: #34d399;
    --color-surface: #f8fafc;
    --color-text: #0b1b2a;

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

    --radius-sm: 3px;
    --radius-md: 4px;
    --radius-lg: 6px;
    --radius-xl: 10px;

    --shadow-sm: 0 1px 0 rgba(2,132,199,.18), 0 2px 10px rgba(2,132,199,.10);
    --shadow-md: 0 2px 0 rgba(2,132,199,.14), 0 10px 24px rgba(2,132,199,.12), 0 1px 2px rgba(0,0,0,.06);
    --shadow-lg: 0 2px 0 rgba(2,132,199,.14), 0 18px 40px rgba(14,165,233,.14), 0 6px 12px rgba(0,0,0,.07);

    --space-section: 3.5rem;
    --space-card: 1rem;
    --space-gap: 1rem;

    --transition: 280ms cubic-bezier(0.2, 0.9, 0.2, 1), 160ms ease;

    --heading-weight: 800;
    --body-line-height: 1.7;
}

/* 基础覆盖 */
body { color: #0b1b2a; 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);
    background:
        radial-gradient(140% 120% at 0% 0%, rgba(52,211,153,.14) 0%, rgba(52,211,153,0) 45%),
        radial-gradient(120% 120% at 100% 20%, rgba(14,165,233,.16) 0%, rgba(14,165,233,0) 55%),
        linear-gradient(180deg, rgba(255,255,255,.92) 0%, rgba(248,250,252,.92) 100%);
    box-shadow:
        0 1px 0 rgba(2,132,199,.14),
        0 2px 12px rgba(2,132,199,.12),
        0 10px 24px rgba(2,132,199,.10),
        inset 0 0 0 1px rgba(2,132,199,.10);
    padding: var(--space-card);
    transition: var(--transition);
    caret-color: var(--color-primary);
}

.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    text-shadow: 0 1px 0 rgba(0,0,0,.06);
}

a:not([class]) {
    color: var(--color-primary);
    transition: var(--transition);
    text-shadow: 0 1px 0 rgba(14,165,233,.10);
}

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

/* news: list-view */
/* 列表模式 (图左文右) */
                .news-grid { display: flex; flex-direction: column; gap: var(--space-gap); }
                .news-grid .card { display: grid; grid-template-columns: 280px 1fr; }

/* 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: left-aligned */
.hero-content { text-align: left; max-width: 600px; }

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

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

/* faq: with-sidebar */
/* FAQ 左 + 联系信息右 */
                .faq-wrapper { display: grid; grid-template-columns: 2fr 1fr; gap: 2rem; }

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

/* cta: card-style */
.cta-inner {
    background:
        linear-gradient(135deg, rgba(14,165,233,.10) 0%, rgba(14,165,233,0) 45%),
        radial-gradient(120% 140% at 80% 0%, rgba(52,211,153,.16) 0%, rgba(52,211,153,0) 55%),
        var(--color-surface);
    border-radius: var(--radius-xl);
    padding: 3rem;
    text-align: center;
    box-shadow:
        0 1px 0 rgba(2,132,199,.10),
        0 18px 40px rgba(14,165,233,.10),
        inset 0 0 0 1px rgba(2,132,199,.10);
    transition: var(--transition);
}

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

/* 条件性装饰 */
.card { border-left: 3px solid var(--color-primary); }

/* 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: 0.9rem; --space-gap: 0.6rem; }
    .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; }
}