:root {
    --color-primary: #3b82f6;
    --color-primary-dark: #1d4ed8;
    --color-accent: #60a5fa;
    --color-surface: #f8fafc;
    --color-text: #0f172a;
    --rgb-primary: 59,130,246;
    --rgb-accent: 96,165,250;
    --radius-sm: 10px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 26px;
    --shadow-sm: 0 10px 22px rgba(15, 23, 42, .10);
    --shadow-md: 0 16px 36px rgba(2, 6, 23, .12), 0 2px 0 rgba(59, 130, 246, .08);
    --shadow-lg: 0 22px 60px rgba(2, 6, 23, .16), 0 10px 26px rgba(59, 130, 246, .12), 0 2px 0 rgba(59, 130, 246, .10);
    --space-section: 3.75rem;
    --space-card: 1.5rem;
    --space-gap: 1.25rem;
    --transition: 260ms cubic-bezier(.2,.9,.2,1);
    --heading-weight: 650;
    --body-line-height: 1.7;
    --color-bg: #0b1220;
    --card-grad-a: rgba(59,130,246,.14);
    --card-grad-b: rgba(15,23,42,.02);
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: linear-gradient(180deg, #0b1220 0%, #0b1626 55%, #0a1220 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-xl);
    box-shadow:
        0 2px 0 rgba(255,255,255,.35) inset,
        0 1px 0 rgba(2,6,23,.22),
        0 18px 40px rgba(2,6,23,.18),
        0 10px 22px rgba(var(--rgb-primary),.12);
    padding: var(--space-card);
    transition: var(--transition);
    background:
        radial-gradient(1200px 180px at 20% 0%, rgba(var(--rgb-primary),.18) 0%, rgba(var(--rgb-primary),0) 55%),
        linear-gradient(180deg, rgba(255,255,255,.86) 0%, rgba(248,250,252,.88) 100%);
    border: 1px solid rgba(148,163,184,.22);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    box-shadow: 0 10px 26px rgba(2,6,23,.12);
}
a:not([class]) { color: var(--color-primary); transition: var(--transition); text-shadow: 0 0 0 rgba(0,0,0,0); }

a:not([class]):hover { text-shadow: 0 8px 22px rgba(var(--rgb-primary),.28); }

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

/* news: featured-left */
/* 左大右小 (1大+2小) */
                .news-grid { display: grid; grid-template-columns: 2fr 1fr; grid-template-rows: auto auto; gap: var(--space-gap); }
                .news-grid > *:first-child { grid-row: span 2; }

/* features: grid-2 */
.feature-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: calc(var(--space-gap) * 1.5); }

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

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

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

/* cta: full-bg */
.cta-section {
    background:
        radial-gradient(1200px 400px at 10% 0%, rgba(59,130,246,.55) 0%, rgba(59,130,246,0) 55%),
        radial-gradient(900px 300px at 90% 20%, rgba(96,165,250,.35) 0%, rgba(96,165,250,0) 55%),
        linear-gradient(135deg, #0b3b91 0%, #2563eb 45%, #3b82f6 100%);
    color: #f1f5f9;
    padding: 4rem 2rem;
    border-top: 1px solid rgba(96,165,250,.35);
    border-bottom: 1px solid rgba(96,165,250,.22);
    box-shadow:
        0 -1px 0 rgba(255,255,255,.12) inset,
        0 18px 60px rgba(2,6,23,.25);
}

/* Page Layout: narrow-centered */
/* 窄版居中 */
            .page-main { max-width: 860px; margin: 0 auto; }

/* 条件性装饰 */
.card:hover, [class*="card"]:hover {
    transform: translateY(-6px);
    box-shadow:
        0 3px 0 rgba(255,255,255,.40) inset,
        0 1px 0 rgba(2,6,23,.24),
        0 26px 72px rgba(2,6,23,.22),
        0 16px 40px rgba(var(--rgb-primary),.18);
}
a:not([class]):hover { color: var(--color-accent); }
.card { border-left: 3px solid rgba(var(--rgb-primary), .95); border-radius: var(--radius-xl); }

header, .header, .navbar {
    box-shadow:
        0 2px 0 rgba(255,255,255,.10) inset,
        0 16px 40px rgba(2,6,23,.18);
    background: rgba(15, 23, 42, .55);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(148,163,184,.18);
}

/* 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: 2.35rem; --space-card: 1.05rem; --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; }
}