: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: 8px;
    --radius-md: 12px;
    --radius-lg: 14px;
    --radius-xl: 18px;
    --shadow-sm: 0 1px 0 rgba(15, 23, 42, .08);
    --shadow-md: 0 10px 30px rgba(2, 6, 23, .08), 0 2px 8px rgba(2, 6, 23, .06);
    --shadow-lg: 0 14px 44px rgba(2, 6, 23, .12), 0 4px 16px rgba(2, 6, 23, .08);
    --space-section: 3rem;
    --space-card: 1.25rem;
    --space-gap: 1rem;
    --transition: 160ms cubic-bezier(.2,.9,.2,1);
    --heading-weight: 600;
    --body-line-height: 1.7;

    --glass: rgba(255,255,255,.72);
    --card-border: rgba(15, 23, 42, .10);
    --card-border-strong: rgba(15, 23, 42, .14);
    --focus-ring: rgba(59,130,246,.35);
    --glow-accent-24: rgba(59,130,246,.40);
    --glow-accent-32: rgba(59,130,246,.60);
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: radial-gradient(1200px 700px at 10% 0%, rgba(59,130,246,.10), transparent 55%), radial-gradient(900px 600px at 90% 10%, rgba(96,165,250,.12), transparent 52%), linear-gradient(#0b1220, #0f172a 55%, #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:
        0 1px 0 rgba(255,255,255,.10) inset,
        0 0 0 1px rgba(255,255,255,.06),
        0 12px 40px rgba(2, 6, 23, .14),
        0 2px 10px rgba(2, 6, 23, .10);
    background: linear-gradient(180deg, rgba(248,250,252,.98), rgba(248,250,252,.92));
    transition: box-shadow 220ms cubic-bezier(.2,.9,.2,1), transform 220ms cubic-bezier(.2,.9,.2,1), border-color 220ms cubic-bezier(.2,.9,.2,1), filter 220ms cubic-bezier(.2,.9,.2,1);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: transform 220ms cubic-bezier(.2,.9,.2,1), box-shadow 220ms cubic-bezier(.2,.9,.2,1), background-color 220ms cubic-bezier(.2,.9,.2,1), color 220ms cubic-bezier(.2,.9,.2,1), border-color 220ms cubic-bezier(.2,.9,.2,1);
}
a:not([class]) { color: var(--color-primary); transition: var(--transition); text-shadow: 0 1px 0 rgba(255,255,255,.06); }

.card {
    border: 1px solid rgba(59,130,246,.18);
    background-clip: padding-box;
}
header, .header, .navbar { background: transparent; }

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

/* news: grid-3 */
/* 三列等宽网格 */
                .news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }

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

/* hero: minimal */
.hero { padding: 2rem 0; } .hero-content { max-width: 560px; }

/* testimonials: grid-3 */
.testimonial-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 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: single-column */
.faq-list { max-width: 800px; margin: 0 auto; }

/* stats: grid-3 */
.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); text-align: center; }

/* cta: full-bg */
.cta-section {
    background: radial-gradient(900px 380px at 15% 10%, rgba(255,255,255,.22), transparent 55%),
                radial-gradient(800px 420px at 80% 0%, rgba(96,165,250,.35), transparent 60%),
                linear-gradient(135deg, #1d4ed8 0%, #3b82f6 52%, #2563eb 100%);
    color: #f8fafc;
    padding: 4rem 2rem;
    box-shadow: 0 30px 90px rgba(59,130,246,.28), 0 14px 50px rgba(2, 6, 23, .30);
    border-radius: 16px;
}

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