:root {
    --color-primary: #0ea5e9;
    --color-primary-dark: #0369a1;
    --color-accent: #a855f7;
    --color-surface: #f7fafc;
    --color-text: #0f172a;
    --rgb-primary: 14,165,233;
    --rgb-accent: 168,85,247;

    --radius-sm: 6px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 24px;

    --shadow-sm:
        0 1px 0 rgba(15, 23, 42, 0.04),
        0 8px 16px rgba(14, 165, 233, 0.10);
    --shadow-md:
        0 4px 10px rgba(0,0,0,0.06),
        0 18px 34px -12px rgba(0,0,0,0.14),
        0 0 0 1px rgba(14, 165, 233, 0.10);
    --shadow-lg:
        0 8px 22px rgba(0,0,0,0.08),
        0 34px 64px -22px rgba(0,0,0,0.18),
        0 0 0 1px rgba(14, 165, 233, 0.14);

    --space-section: 3rem;
    --space-card: 1.25rem;
    --space-gap: 1rem;

    --transition: 0.38s cubic-bezier(.2,.8,.2,1);

    --heading-weight: 700;
    --body-line-height: 1.7;
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: linear-gradient(180deg, #f8fafc 0%, #f2f7ff 55%, #f7fafc 100%); }
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);
    padding: var(--space-card);
    box-shadow:
        0 4px 8px rgba(0,0,0,0.05),
        0 20px 40px -10px rgba(0,0,0,0.12),
        0 0 0 1px rgba(2, 132, 199, 0.12);
    transition: var(--transition);
    background:
        radial-gradient(120% 120% at 10% 0%, rgba(14, 165, 233, 0.13) 0%, rgba(168, 85, 247, 0.07) 35%, rgba(255,255,255,0) 60%),
        linear-gradient(180deg, rgba(255,255,255,0.85) 0%, rgba(255,255,255,0.75) 100%);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    box-shadow:
        0 6px 14px rgba(0,0,0,0.08),
        0 0 0 1px rgba(168, 85, 247, 0.18);
}
a:not([class]) { color: var(--color-primary); transition: var(--transition); text-decoration-thickness: 1px; text-underline-offset: 3px; }

a:not([class]):hover { color: var(--color-accent); text-shadow: 0 10px 25px rgba(168, 85, 247, 0.22); }

/* ========== 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) * 0.8); }

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

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

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

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

/* cta: split */
.cta-inner { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 2rem; }

/* 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 color-mix(in srgb, var(--color-primary) 80%, white 20%); }
.card:hover {
    box-shadow:
        0 6px 16px rgba(0,0,0,0.06),
        0 28px 56px -18px rgba(0,0,0,0.18),
        0 0 0 1px rgba(168, 85, 247, 0.20);
    transform: translateY(-2px);
}

/* 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; --radius-lg: 18px; --radius-md: 12px; }
    .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; }
}