:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-accent: #06b6d4;
    --color-surface: #f8fafc;
    --color-text: #0f172a;
    --rgb-primary: 37,99,235;
    --rgb-accent: 6,182,212;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 26px;
    --shadow-sm: 0 6px 18px rgba(2, 132, 199, .10), 0 1px 0 rgba(15, 23, 42, .06);
    --shadow-md: 0 10px 28px rgba(2, 132, 199, .12), 0 2px 0 rgba(15, 23, 42, .05), 0 1px 14px rgba(37, 99, 235, .08);
    --shadow-lg: 0 18px 44px rgba(2, 132, 199, .16), 0 7px 22px rgba(37, 99, 235, .12), 0 1px 0 rgba(15, 23, 42, .06);
    --space-section: 5rem;
    --space-card: 2rem;
    --space-gap: 1.5rem;
    --transition: 320ms cubic-bezier(.2,.8,.2,1);
    --heading-weight: 700;
    --body-line-height: 1.6;
    --ring-color: rgba(37, 99, 235, .35);
    --card-border: rgba(2, 132, 199, .14);
    --card-accent: rgba(6, 182, 212, .18);
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background: radial-gradient(1200px 700px at 10% -10%, rgba(37,99,235,.10), transparent 55%), radial-gradient(900px 600px at 90% 0%, rgba(6,182,212,.10), transparent 60%), linear-gradient(#f7fafc, #f3f6fb); }
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(15, 23, 42, .06),
        0 12px 34px rgba(37, 99, 235, .10),
        0 6px 18px rgba(2, 132, 199, .10);
    padding: var(--space-card);
    transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition), background var(--transition), filter var(--transition);
    background:
        linear-gradient(180deg, rgba(255,255,255,.92), rgba(255,255,255,.78));
    position: relative;
}
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: background var(--transition), box-shadow var(--transition), transform var(--transition), color var(--transition), border-color var(--transition); }
a:not([class]) { color: var(--color-primary); transition: var(--transition); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:not([class]):hover { color: var(--color-primary-dark); }
.card::before, [class*="card"]::before {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: inherit;
    pointer-events: none;
    background:
        linear-gradient(90deg, rgba(6,182,212,.30), rgba(37,99,235,.18) 35%, rgba(37,99,235,.06) 70%, rgba(255,255,255,0) 100%);
    opacity: .55;
    mask: linear-gradient(#000, #000) content-box, linear-gradient(#000, #000);
    -webkit-mask: linear-gradient(#000, #000) content-box, linear-gradient(#000, #000);
    padding: 1px;
}
.card::after, [class*="card"]::after {
    content: "";
    position: absolute;
    inset: -1px;
    border-radius: inherit;
    pointer-events: none;
    background:
        radial-gradient(900px 260px at 0% 0%, rgba(6,182,212,.20), transparent 55%),
        radial-gradient(600px 220px at 100% 0%, rgba(37,99,235,.16), transparent 55%);
    opacity: .55;
    filter: blur(10px);
}

/* ========== 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-4 */
.feature-list { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); }

/* hero: centered */
.hero-content { text-align: center; max-width: 800px; margin: 0 auto; }

/* testimonials: masonry */
.testimonial-list { column-count: 2; column-gap: var(--space-gap); }
                .testimonial-list > * { break-inside: avoid; margin-bottom: var(--space-gap); }
                .testimonial-list > * { filter: saturate(1.02); }

/* partners: centered */
.partner-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 2rem; }

/* faq: with-sidebar */
/* FAQ 左 + 联系信息右 */
                .faq-wrapper { display: grid; grid-template-columns: 2fr 1fr; gap: 2rem; }

/* stats: grid-4 */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); text-align: center; }

/* cta: card-style */
.cta-inner {
    background:
        radial-gradient(900px 340px at 20% 0%, rgba(6,182,212,.16), transparent 55%),
        radial-gradient(900px 340px at 90% 20%, rgba(37,99,235,.14), transparent 55%),
        linear-gradient(180deg, rgba(248,250,252,.92), rgba(248,250,252,.70));
    border-radius: var(--radius-xl);
    padding: 3rem;
    text-align: center;
    box-shadow:
        0 1px 0 rgba(15, 23, 42, .06),
        0 18px 50px rgba(37, 99, 235, .10),
        0 10px 30px rgba(2, 132, 199, .10);
    border: 1px solid rgba(37, 99, 235, .12);
}

/* Page Layout: wide */
/* 超宽 */
            .page-main { max-width: 1400px; margin: 0 auto; }

/* 条件性装饰 */
.card:hover, [class*="card"]:hover {
    transform: translateY(-6px);
    box-shadow:
        0 1px 0 rgba(15, 23, 42, .07),
        0 26px 70px rgba(2, 132, 199, .18),
        0 14px 40px rgba(37, 99, 235, .16),
        0 6px 18px rgba(15, 23, 42, .06);
    border-color: rgba(6, 182, 212, .22);
    filter: saturate(1.05);
    transition-duration: 360ms;
}
.card { border: 1px solid rgba(2, 132, 199, .16); }
header, .header, .navbar {
    box-shadow:
        0 1px 0 rgba(15, 23, 42, .06),
        0 10px 26px rgba(37, 99, 235, .10),
        0 6px 16px rgba(2, 132, 199, .08);
    border-bottom: 1px solid rgba(2, 132, 199, .12);
    background: linear-gradient(180deg, rgba(255,255,255,.78), rgba(255,255,255,.60));
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

/* 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; --radius-lg: 18px; --radius-xl: 22px; }
    .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; box-shadow: 0 1px 0 rgba(15, 23, 42, .06), 0 14px 44px rgba(37, 99, 235, .10), 0 8px 24px rgba(2, 132, 199, .10); }
}