:root {
    --color-primary: #1f2937;
    --color-primary-dark: #0b1220;
    --color-accent: #60a5fa;
    --color-surface: #f7fafc;
    --color-text: #0b1220;

    --rgb-primary: 31,41,55;
    --rgb-accent: 96,165,250;

    --radius-sm: 10px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 26px;

    --shadow-sm:
        0 1px 0 rgba(2, 6, 23, 0.04),
        0 6px 18px rgba(2, 6, 23, 0.06);
    --shadow-md:
        0 10px 30px rgba(2, 6, 23, 0.10),
        0 2px 10px rgba(96, 165, 250, 0.10),
        0 1px 0 rgba(255, 255, 255, 0.55) inset;
    --shadow-lg:
        0 18px 50px rgba(2, 6, 23, 0.14),
        0 10px 22px rgba(96, 165, 250, 0.12),
        0 1px 0 rgba(255, 255, 255, 0.58) inset;

    --space-section: 2rem;
    --space-card: 1rem;
    --space-gap: 24px;

    --transition: 520ms cubic-bezier(0.16, 1, 0.3, 1);
    --heading-weight: 700;
    --body-line-height: 1.75;
}

/* 基础覆盖 */
body {
    color: var(--color-text);
    line-height: var(--body-line-height);
    background:
        radial-gradient(1100px 600px at 10% -10%, rgba(96, 165, 250, 0.18), rgba(96, 165, 250, 0) 55%),
        radial-gradient(900px 500px at 90% 0%, rgba(20, 184, 166, 0.14), rgba(20, 184, 166, 0) 52%),
        linear-gradient(180deg, rgba(247, 250, 252, 1), rgba(248, 250, 252, 0.9));
}
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 16px 40px rgba(2, 6, 23, 0.14),
        0 10px 18px rgba(96, 165, 250, 0.12),
        0 2px 0 rgba(255, 255, 255, 0.75) inset,
        0 -1px 0 rgba(2, 6, 23, 0.04) inset;
    padding: var(--space-card);
    transition: var(--transition);
    background:
        radial-gradient(120% 120% at 0% 0%, rgba(255, 255, 255, 0.92), rgba(255, 255, 255, 0.78) 40%, rgba(248, 250, 252, 0.92) 100%);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    box-shadow:
        0 10px 24px rgba(2, 6, 23, 0.12),
        0 2px 0 rgba(255, 255, 255, 0.7) inset;
}
a:not([class]) {
    color: var(--color-primary);
    transition: var(--transition);
    text-shadow: 0 1px 0 rgba(255, 255, 255, 0.65);
}

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

/* stats: big-number */
/* 大数字居中 */
                .stats-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 2rem; }
                .stats-grid .stat-value { font-size: 3rem; }

/* cta: full-bg */
.cta-section {
    background:
        radial-gradient(1200px 520px at 10% 0%, rgba(96, 165, 250, 0.35), rgba(96, 165, 250, 0) 55%),
        radial-gradient(1000px 480px at 90% 30%, rgba(20, 184, 166, 0.26), rgba(20, 184, 166, 0) 52%),
        linear-gradient(180deg, #162436, #0b1220);
    color: rgba(255, 255, 255, 0.95);
    padding: 4rem 2rem;
    box-shadow:
        0 26px 70px rgba(2, 6, 23, 0.22),
        0 10px 26px rgba(96, 165, 250, 0.18);
    border-radius: var(--radius-xl);
}

/* Page Layout: full-width */
/* 无侧边栏, 全宽 */
            .page-main { max-width: 1200px; margin: 0 auto; }

/* 条件性装饰 */
a:not([class]):hover {
    color: var(--color-accent);
    text-shadow: 0 0 24px rgba(96, 165, 250, 0.28);
}
header, .header, .navbar {
    background: transparent;
    backdrop-filter: blur(0px);
}

/* 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: 24px; }
    .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; }
}