:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-accent: #06b6d4;
    --color-surface: #f3f6fb;
    --color-text: #0b1220;
    --rgb-primary: 37,99,235;
    --rgb-accent: 6,182,212;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 18px;
    --radius-xl: 22px;
    --shadow-sm: 0 2px 6px rgba(15, 23, 42, 0.08);
    --shadow-md: 0 4px 10px rgba(2, 6, 23, 0.07), 0 18px 36px -18px rgba(2, 6, 23, 0.14);
    --shadow-lg: 0 6px 16px rgba(2, 6, 23, 0.08), 0 26px 60px -28px rgba(2, 6, 23, 0.18);
    --space-section: 4rem;
    --space-card: 1.5rem;
    --space-gap: 1.25rem;
    --transition: 0.38s cubic-bezier(0.2, 0.75, 0.2, 1);
    --heading-weight: 800;
    --body-line-height: 1.75;
}

body {
    color: var(--color-text);
    line-height: var(--body-line-height);
    background: radial-gradient(1200px 600px at 20% -10%, rgba(37, 99, 235, 0.08), transparent 55%),
                radial-gradient(900px 500px at 90% 0%, rgba(6, 182, 212, 0.08), transparent 50%),
                linear-gradient(180deg, #f7f9fc 0%, var(--color-surface) 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 1px 0 rgba(255, 255, 255, 0.75) inset,
        0 2px 8px rgba(2, 6, 23, 0.06),
        0 10px 26px -16px rgba(2, 6, 23, 0.18),
        0 28px 60px -36px rgba(2, 6, 23, 0.18);
    padding: var(--space-card);
    transition: box-shadow var(--transition), transform var(--transition), background-color var(--transition), border-color var(--transition);
    background: linear-gradient(180deg, #ffffff 0%, #fbfdff 100%);
    border: 1px solid rgba(15, 23, 42, 0.06);
}

.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: background-color var(--transition), color var(--transition), box-shadow var(--transition), transform var(--transition), border-color var(--transition);
}

a:not([class]) {
    color: var(--color-primary);
    transition: color var(--transition), text-shadow var(--transition);
    text-shadow: 0 0 0 rgba(0,0,0,0);
}

@media (prefers-reduced-motion: reduce) {
    :root { --transition: 0.01s linear; }
}

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

/* 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: 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-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 420px at 15% 15%, rgba(255, 255, 255, 0.18), rgba(255, 255, 255, 0) 60%),
                linear-gradient(135deg, #1d4ed8 0%, #2563eb 45%, #0ea5e9 110%);
    color: #ffffff;
    padding: 4rem 2rem;
    box-shadow:
        0 1px 0 rgba(255, 255, 255, 0.22) inset,
        0 16px 40px -22px rgba(2, 6, 23, 0.4),
        0 40px 110px -60px rgba(2, 6, 23, 0.35);
    border-top: 1px solid rgba(255, 255, 255, 0.12);
}

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

/* 条件性装饰 */
header, .header, .navbar { background: transparent; }

/* 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; }
}