:root {
    --color-primary: #0ea5e9;
    --color-primary-dark: #075985;
    --color-accent: #a78bfa;
    --color-surface: #f8fafc;
    --color-text: #0b1220;
    --rgb-primary: 14,165,233;
    --rgb-accent: 167,139,250;
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 18px;
    --radius-xl: 26px;
    --shadow-sm: 0 1px 0 rgba(2, 6, 23, 0.06), 0 10px 26px rgba(2, 6, 23, 0.06);
    --shadow-md: 0 2px 0 rgba(2, 6, 23, 0.04), 0 18px 45px rgba(2, 6, 23, 0.10), 0 4px 12px rgba(2, 6, 23, 0.06);
    --shadow-lg: 0 1px 0 rgba(2, 6, 23, 0.05), 0 26px 70px rgba(2, 6, 23, 0.14), 0 10px 26px rgba(2, 6, 23, 0.08);
    --space-section: 4rem;
    --space-card: 1.5rem;
    --space-gap: 1.25rem;
    --transition: 520ms cubic-bezier(.2,.9,.2,1);
    --heading-weight: 800;
    --body-line-height: 1.65;
    --shadow-card-inset: inset 0 1px 0 rgba(255,255,255,.65), inset 0 -1px 0 rgba(2,6,23,.06);
    --focus-ring: rgba(14,165,233,.35);
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: radial-gradient(1200px 700px at 20% -10%, rgba(14,165,233,.10) 0%, rgba(14,165,233,0) 55%), radial-gradient(900px 600px at 80% 0%, rgba(167,139,250,.12) 0%, rgba(167,139,250,0) 52%), var(--color-surface); }
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: var(--shadow-card-inset), 0 0 0 1px rgba(2,6,23,.06), 0 10px 26px rgba(2,6,23,.08), 0 2px 6px rgba(2,6,23,.06); padding: var(--space-card); transition: var(--transition); background: linear-gradient(180deg, rgba(255,255,255,.86) 0%, rgba(255,255,255,.70) 100%); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); box-shadow: 0 0 0 1px rgba(2,6,23,.08), 0 10px 28px rgba(2,6,23,.10); }
a:not([class]) { color: var(--color-primary); transition: var(--transition); text-shadow: 0 1px 0 rgba(255,255,255,.6); }

.card:hover, [class*="card"]:hover { transform: translateY(-5px); box-shadow: var(--shadow-card-inset), 0 0 0 1px rgba(2,6,23,.08), 0 18px 55px rgba(2,6,23,.14), 0 8px 18px rgba(2,6,23,.08); }
a:not([class]):hover { color: var(--color-accent); text-shadow: 0 0 0 rgba(0,0,0,0), 0 12px 30px rgba(167,139,250,.25); }

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

/* news: masonry-2 */
/* 两列瀑布流 */
                .news-grid { column-count: 2; column-gap: var(--space-gap); }
                .news-grid .card { break-inside: avoid; margin-bottom: var(--space-gap); border-radius: calc(var(--radius-xl) - 2px); }

/* features: centered */
/* 居中大卡片 */
                .feature-list { display: flex; flex-direction: column; align-items: center; gap: calc(var(--space-gap) * 2); max-width: 720px; margin: 0 auto; }

/* 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); border-radius: var(--radius-xl); }

/* partners: grid-4 */
.partner-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: calc(var(--space-gap) * 1.5); align-items: center; }
.partner-grid .card, .partner-grid [class*="card"] { box-shadow: var(--shadow-card-inset), 0 0 0 1px rgba(2,6,23,.05), 0 10px 24px rgba(2,6,23,.07); border-radius: calc(var(--radius-xl) - 4px); }

/* faq: two-column */
.faq-list { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-gap); }
.faq-list .card, .faq-list [class*="card"] { box-shadow: var(--shadow-card-inset), 0 0 0 1px rgba(2,6,23,.06), 0 12px 34px rgba(2,6,23,.09); }

/* stats: inline */
/* 水平排列 */
                .stats-grid { display: flex; justify-content: center; gap: 3rem; }

/* cta: centered */
.cta-inner { text-align: center; max-width: 700px; margin: 0 auto; }

/* 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; }
}