:root {
    --color-primary: #3b82f6;
    --color-primary-dark: #1d4ed8;
    --color-accent: #93c5fd;
    --color-surface: #f8fafc;
    --color-text: #0f172a;
    --rgb-primary: 59,130,246;
    --rgb-accent: 147,197,253;
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 18px;
    --radius-xl: 24px;
    --shadow-sm: 0 10px 30px rgba(2, 6, 23, 0.10);
    --shadow-md: 0 14px 40px rgba(2, 6, 23, 0.14), 0 3px 10px rgba(2, 6, 23, 0.06);
    --shadow-lg: 0 20px 60px rgba(2, 6, 23, 0.18), 0 6px 18px rgba(2, 6, 23, 0.08);
    --space-section: 4rem;
    --space-card: 1.5rem;
    --space-gap: 1.25rem;
    --transition: 560ms cubic-bezier(0.16, 1, 0.3, 1);
    --heading-weight: 700;
    --body-line-height: 1.7;
}

body {
    color: var(--color-text);
    line-height: var(--body-line-height);
    background: radial-gradient(1000px 450px at 10% -10%, rgba(59, 130, 246, 0.14) 0%, rgba(59, 130, 246, 0) 60%),
                radial-gradient(900px 420px at 95% 5%, rgba(2, 132, 199, 0.10) 0%, rgba(2, 132, 199, 0) 55%),
                linear-gradient(180deg, #0b1220 0%, #0f172a 45%, #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, 0.20) inset,
                0 18px 50px rgba(0, 0, 0, 0.24),
                0 10px 30px rgba(15, 23, 42, 0.20);
    padding: var(--space-card);
    transition: var(--transition);
    background: linear-gradient(180deg, rgba(248, 250, 252, 0.98) 0%, rgba(241, 245, 249, 0.96) 100%);
    border: 1px solid rgba(148, 163, 184, 0.22);
}

.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 1px 0 rgba(2, 6, 23, 0.25);
}

a:not([class]):hover {
    color: var(--color-accent);
    filter: saturate(1.05);
}

.hero, [class*="hero"], section:first-of-type {
    background: radial-gradient(700px 320px at 20% 20%, rgba(147, 197, 253, 0.35) 0%, rgba(147, 197, 253, 0) 60%),
                radial-gradient(620px 280px at 85% 30%, rgba(59, 130, 246, 0.30) 0%, rgba(59, 130, 246, 0) 62%),
                linear-gradient(135deg, #1e293b 0%, #334155 45%, #0f172a 100%);
    border-top: 1px solid rgba(148, 163, 184, 0.16);
    border-bottom: 1px solid rgba(148, 163, 184, 0.10);
}

header, .header, .navbar {
    box-shadow: 0 12px 34px rgba(2, 6, 23, 0.30), 0 2px 10px rgba(2, 6, 23, 0.20);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(148, 163, 184, 0.14);
}

/* ========== 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);
                    box-shadow: 0 1px 0 rgba(148, 163, 184, 0.18) inset,
                                0 14px 44px rgba(2, 6, 23, 0.20),
                                0 7px 18px rgba(2, 6, 23, 0.10);
                    border-radius: 22px;
                    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
                }

/* features: horizontal */
/* 水平滚动 */
                .feature-list { display: flex; gap: var(--space-gap); overflow-x: auto; scroll-snap-type: x mandatory; }
                .feature-list > * { flex: 0 0 300px; scroll-snap-align: start; }

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

/* testimonials: carousel */
/* 单条轮播 */
                .testimonial-list { display: flex; overflow: hidden; } 
                .testimonial-list > * { flex: 0 0 100%; }

/* partners: grid-6 */
.partner-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: var(--space-gap); align-items: center; }

/* faq: single-column */
.faq-list { max-width: 800px; margin: 0 auto; }

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

/* 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; }

/* 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: 3rem; --space-card: 1.1rem; --space-gap: 0.95rem; }
    .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; }
}