:root {
    --color-primary: #0ea5e9;
    --color-primary-dark: #0284c7;
    --color-accent: #60a5fa;
    --color-surface: #f8fafc;
    --color-text: #0f172a;
    --rgb-primary: 14,165,233;
    --rgb-accent: 96,165,250;
    --radius-sm: 2px;
    --radius-md: 3px;
    --radius-lg: 4px;
    --radius-xl: 6px;
    --shadow-sm: 4px 4px 0 rgba(15, 23, 42, .22);
    --shadow-md: 4px 4px 0 rgba(15, 23, 42, .26), 0 0 0 2px rgba(2, 132, 199, .08);
    --shadow-lg: 4px 4px 0 rgba(15, 23, 42, .32), 8px 8px 18px rgba(2, 132, 199, .14);
    --space-section: 4rem;
    --space-card: 1.5rem;
    --space-gap: 1.25rem;
    --transition: 0.15s cubic-bezier(.2,.8,.2,1);
    --heading-weight: 600;
    --body-line-height: 1.65;
    --shadow-border: rgba(51, 65, 85, .25);
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: #0b1220; }
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: var(--shadow-lg); padding: var(--space-card); transition: var(--transition); border: 2px solid var(--shadow-border); background: #0f172a; }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); border: 2px solid rgba(96,165,250,.35); }
a:not([class]) { color: var(--color-primary); transition: var(--transition); text-shadow: 0 1px 0 rgba(0,0,0,.35); }

.btn:hover, button[class*="btn"]:hover, a[class*="btn"]:hover { box-shadow: 4px 4px 0 rgba(15, 23, 42, .35); }

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

/* testimonials: masonry */
.testimonial-list { column-count: 2; column-gap: var(--space-gap); }
                .testimonial-list > * { break-inside: avoid; margin-bottom: var(--space-gap); border: 2px solid rgba(51, 65, 85, .28); border-radius: var(--radius-sm); box-shadow: 4px 4px 0 rgba(15, 23, 42, .22); background: rgba(15, 23, 42, .75); }

/* partners: grid-6 */
.partner-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: var(--space-gap); align-items: center; }
.partner-grid > * { border-radius: var(--radius-sm); border: 2px solid rgba(51, 65, 85, .22); box-shadow: 4px 4px 0 rgba(15, 23, 42, .18); background: rgba(248, 250, 252, .86); }

/* faq: with-sidebar */
/* FAQ 左 + 联系信息右 */
                .faq-wrapper { display: grid; grid-template-columns: 2fr 1fr; gap: 2rem; }
.faq-wrapper > * { background: rgba(248, 250, 252, .06); border: 2px solid rgba(51, 65, 85, .25); border-radius: var(--radius-sm); box-shadow: 4px 4px 0 rgba(15, 23, 42, .20); }

/* stats: grid-4 */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); text-align: center; }
.stats-grid > * { border-radius: var(--radius-sm); border: 2px solid rgba(51, 65, 85, .22); background: rgba(248, 250, 252, .06); box-shadow: 4px 4px 0 rgba(15, 23, 42, .18); }

/* cta: card-style */
.cta-inner { background: radial-gradient(1200px 420px at 20% 0%, rgba(59,130,246,.30), transparent 55%), linear-gradient(135deg, rgba(30,41,59,.95), rgba(15,23,42,.95)); border-radius: var(--radius-xl); padding: 3rem; text-align: center; border: 2px solid rgba(96,165,250,.35); box-shadow: 4px 4px 0 rgba(15, 23, 42, .36), 10px 10px 26px rgba(59,130,246,.14); }

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

/* 条件性装饰 */
.hero, [class*="hero"], section:first-of-type { background: linear-gradient(135deg, #0f172a 0%, #1e293b 42%, #0b1220 100%); box-shadow: inset 0 0 0 2px rgba(59,130,246,.25); }
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; }
}