:root {
    --color-primary: #3b82f6;
    --color-primary-dark: #1d4ed8;
    --color-accent: #22d3ee;
    --color-surface: #f8fafc;
    --color-text: #e2e8f0;
    --rgb-primary: 59,130,246;
    --rgb-accent: 34,211,238;

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 18px;

    --shadow-sm: 0 1px 0 rgba(15, 23, 42, 0.22);
    --shadow-md: 0 10px 22px rgba(2, 6, 23, 0.28), 0 2px 6px rgba(2, 6, 23, 0.22), 0 0 0 rgba(59, 130, 246, 0);
    --shadow-lg: 0 16px 40px rgba(2, 6, 23, 0.35), 0 6px 14px rgba(2, 6, 23, 0.25), 0 0 28px rgba(59, 130, 246, 0.28);

    --space-section: 5rem;
    --space-card: 1.1rem;
    --space-gap: 0.875rem;

    --transition: 360ms cubic-bezier(0.22, 1, 0.36, 1);
    --heading-weight: 650;
    --body-line-height: 1.7;
}

/* 基础覆盖 */
body { color: #e2e8f0; line-height: var(--body-line-height); background: radial-gradient(1200px 600px at 20% -10%, rgba(59, 130, 246, 0.18) 0%, rgba(30, 41, 59, 0) 55%), radial-gradient(900px 520px at 85% 0%, rgba(34, 211, 238, 0.14) 0%, rgba(30, 41, 59, 0) 60%), linear-gradient(180deg, #0f172a 0%, #111827 40%, #0b1220 100%); }
h1, h2, h3, h4 { font-weight: var(--heading-weight); }
section, .section { padding-top: var(--space-section); padding-bottom: var(--space-section); background: transparent; }
.card, [class*="card"] {
    border-radius: var(--radius-lg);
    background: linear-gradient(180deg, rgba(248, 250, 252, 0.98) 0%, rgba(241, 245, 249, 0.96) 100%);
    color: #0f172a;
    box-shadow:
        0 1px 0 rgba(255,255,255,0.55) inset,
        0 -1px 0 rgba(15,23,42,0.08) inset,
        0 14px 28px rgba(2, 6, 23, 0.28),
        0 3px 10px rgba(2, 6, 23, 0.22),
        0 0 0 rgba(59, 130, 246, 0);
    padding: var(--space-card);
    transition: var(--transition);
    outline: 1px solid rgba(148, 163, 184, 0.18);
    outline-offset: -1px;
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: 420ms cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: 0 10px 24px rgba(59, 130, 246, 0.18);
}
a:not([class]) { color: var(--color-primary); transition: var(--transition); }
a:not([class]):hover { color: #93c5fd; text-shadow: 0 0 22px rgba(59, 130, 246, 0.35); }

/* ========== 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-4 */
.feature-list { display: grid; grid-template-columns: repeat(4, 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: 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: inline */
/* 水平排列 */
                .stats-grid { display: flex; justify-content: center; gap: 3rem; }

/* cta: centered */
.cta-inner { text-align: center; max-width: 700px; margin: 0 auto; }

/* 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(-4px);
    box-shadow:
        0 1px 0 rgba(255,255,255,0.62) inset,
        0 -1px 0 rgba(15,23,42,0.10) inset,
        0 18px 46px rgba(2, 6, 23, 0.38),
        0 6px 16px rgba(2, 6, 23, 0.26),
        0 0 24px rgba(59, 130, 246, 0.40),
        0 0 40px rgba(59, 130, 246, 0.22);
    outline-color: rgba(147, 197, 253, 0.55);
}
.card:hover .glow, [class*="card"]:hover .glow { opacity: 1; }
.hero, [class*="hero"], section:first-of-type {
    background:
        radial-gradient(900px 260px at 20% 0%, rgba(59, 130, 246, 0.28) 0%, rgba(59, 130, 246, 0) 60%),
        radial-gradient(820px 260px at 80% 10%, rgba(34, 211, 238, 0.18) 0%, rgba(34, 211, 238, 0) 55%),
        linear-gradient(135deg, rgba(30, 41, 59, 0.9) 0%, rgba(17, 24, 39, 0.9) 55%, rgba(15, 23, 42, 0.95) 100%);
}
.card { border-left: 3px solid rgba(59, 130, 246, 0.95); }
header, .header, .navbar {
    background: transparent;
    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: 0.95rem; --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; }
}