:root {
    --color-primary: #1d4ed8;
    --color-primary-dark: #1e40af;
    --color-accent: #3b82f6;
    --color-surface: #f8fafc;
    --color-text: #0f172a;
    --rgb-primary: 29,78,216;
    --rgb-accent: 59,130,246;
    --radius-sm: 3px;
    --radius-md: 4px;
    --radius-lg: 6px;
    --radius-xl: 10px;
    --shadow-sm: 0 1px 0 rgba(15, 23, 42, .18);
    --shadow-md: 0 10px 24px rgba(2, 6, 23, .10), 0 2px 6px rgba(2, 6, 23, .06), 0 0 0 1px rgba(148, 163, 184, .12) inset;
    --shadow-lg: 0 18px 46px rgba(2, 6, 23, .16), 0 6px 18px rgba(2, 6, 23, .10), 0 0 0 1px rgba(148, 163, 184, .16) inset;
    --space-section: 2rem;
    --space-card: 1rem;
    --space-gap: 0.75rem;
    --transition: 90ms cubic-bezier(.2,.8,.2,1);
    --heading-weight: 600;
    --body-line-height: 1.65;
}

/* 基础覆盖 */
body {
    color: var(--color-text);
    line-height: var(--body-line-height);
    background: radial-gradient(1200px 700px at 15% 10%, rgba(59, 130, 246, .10), transparent 55%),
                radial-gradient(900px 600px at 85% 20%, rgba(30, 64, 175, .10), transparent 52%),
                linear-gradient(180deg, #0b1220 0%, #0f172a 28%, #0b1220 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);
    box-shadow:
        0 1px 0 rgba(148, 163, 184, .20),
        0 10px 28px rgba(2, 6, 23, .16),
        0 2px 10px rgba(2, 6, 23, .08),
        0 0 0 1px rgba(148, 163, 184, .12) inset;
    padding: var(--space-card);
    transition: var(--transition);
    background: linear-gradient(180deg, rgba(248, 250, 252, .96) 0%, rgba(241, 245, 249, .96) 100%);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    box-shadow:
        0 1px 0 rgba(148, 163, 184, .22),
        0 8px 18px rgba(2, 6, 23, .14);
}
a:not([class]) {
    color: var(--color-accent);
    transition: var(--transition);
    text-shadow: 0 0 0 rgba(0,0,0,0);
}

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

/* news: featured-top */
/* 首篇横跨全宽 */
                .news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }
                .news-grid > *:first-child { grid-column: span 3; }

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

/* hero: overlay */
/* 全屏背景+文字覆盖 */
                .hero { position: relative; min-height: 70vh; display: flex; align-items: center; }
                .hero-content { position: relative; z-index: 1; }

/* 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: two-column */
.faq-list { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-gap); }

/* stats: big-number */
/* 大数字居中 */
                .stats-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 2rem; }
                .stats-grid .stat-value { font-size: 3rem; }

/* cta: full-bg */
.cta-section {
    background: radial-gradient(900px 520px at 18% 30%, rgba(59, 130, 246, .55), transparent 55%),
                radial-gradient(700px 420px at 78% 35%, rgba(30, 64, 175, .55), transparent 54%),
                linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: #ffffff;
    padding: 4rem 2rem;
    box-shadow: 0 22px 70px rgba(2, 6, 23, .28);
}

/* 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(-3px);
    box-shadow:
        0 24px 60px rgba(2, 6, 23, .22),
        0 10px 26px rgba(2, 6, 23, .14),
        0 0 0 1px rgba(59, 130, 246, .22) inset,
        0 1px 0 rgba(148, 163, 184, .24);
}
.hero, [class*="hero"], section:first-of-type {
    background:
        radial-gradient(1000px 540px at 20% 25%, rgba(59, 130, 246, .22), transparent 55%),
        radial-gradient(800px 520px at 85% 18%, rgba(30, 64, 175, .18), transparent 55%),
        linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
}
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; }
}