:root {
    --color-primary: #1d4ed8;
    --color-primary-dark: #1e3a8a;
    --color-accent: #22c55e;
    --color-surface: #f1f5ff;
    --color-text: #0f172a;
    --rgb-primary: 29,78,216;
    --rgb-accent: 34,197,94;
    --radius-sm: 0;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 22px;
    --shadow-sm:
        0 1px 0 rgba(15, 23, 42, 0.04),
        0 6px 14px rgba(2, 6, 23, 0.06);
    --shadow-md:
        0 2px 0 rgba(15, 23, 42, 0.04),
        0 10px 24px rgba(2, 6, 23, 0.08),
        0 1px 0 rgba(255, 255, 255, 0.25) inset;
    --shadow-lg:
        0 6px 0 rgba(15, 23, 42, 0.03),
        0 18px 50px -18px rgba(29, 78, 216, 0.35),
        0 22px 70px -28px rgba(2, 6, 23, 0.24),
        0 1px 0 rgba(255, 255, 255, 0.22) inset;
    --space-section: 3rem;
    --space-card: 1.25rem;
    --space-gap: 1rem;
    --transition: 0.42s cubic-bezier(0.16, 1, 0.3, 1);
    --heading-weight: 800;
    --body-line-height: 1.75;
}

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-xl);
    box-shadow:
        0 2px 0 rgba(15, 23, 42, 0.04),
        0 10px 24px rgba(2, 6, 23, 0.08),
        0 0 0 1px rgba(29, 78, 216, 0.10);
    padding: var(--space-card);
    transition: var(--transition);
    background: rgba(241, 245, 255, 0.92);
}
.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 0 0 rgba(0,0,0,0);
}

/* ========== 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: split */
/* 左文右图 */
                .hero-inner {
                    display: grid;
                    grid-template-columns: 1fr 1fr;
                    gap: 2rem;
                    align-items: center;
                }

/* testimonials: masonry */
.testimonial-list { column-count: 2; column-gap: var(--space-gap); }
                .testimonial-list > * { break-inside: avoid; margin-bottom: var(--space-gap); }

/* partners: grid-4 */
.partner-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: calc(var(--space-gap) * 1.5); align-items: center; }

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

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

/* cta: full-bg */
.cta-section {
    background:
        radial-gradient(1200px 480px at 10% 10%, rgba(255,255,255,0.22), rgba(255,255,255,0) 55%),
        radial-gradient(900px 380px at 90% 20%, rgba(34,197,94,0.22), rgba(34,197,94,0) 60%),
        linear-gradient(135deg, var(--color-primary) 0%, #0ea5e9 40%, #16a34a 100%);
    color: #ffffff;
    padding: 4rem 2rem;
    box-shadow:
        0 18px 60px -32px rgba(2, 6, 23, 0.55),
        0 0 0 1px rgba(255,255,255,0.14) inset;
}

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

/* 条件性装饰 */
.card:hover, [class*="card"]:hover {
    transform: translateY(-5px);
    box-shadow:
        0 10px 40px -18px rgba(29, 78, 216, 0.55),
        0 26px 90px -45px rgba(2, 6, 23, 0.34),
        0 0 0 1px rgba(29, 78, 216, 0.18),
        0 1px 0 rgba(255, 255, 255, 0.30) inset;
}
a:not([class]):hover { color: var(--color-accent); text-shadow: 0 10px 28px rgba(34, 197, 94, 0.22); }
header, .header, .navbar { background: transparent; }

/* 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; }
}