:root {
    --color-primary: #334155;
    --color-primary-dark: #0b1220;
    --color-accent: #a78bfa;
    --color-surface: #f6f7fb;
    --color-text: #0f172a;
    --rgb-primary: 51,65,85;
    --rgb-accent: 167,139,250;
    --radius-sm: 7px;
    --radius-md: 14px;
    --radius-lg: 16px;
    --radius-xl: 22px;
    --shadow-sm: none;
    --shadow-md: 0 10px 30px rgba(15, 23, 42, 0.08);
    --shadow-lg: 0 18px 45px rgba(15, 23, 42, 0.12);
    --space-section: 2rem;
    --space-card: 1rem;
    --space-gap: 0.75rem;
    --transition: 0.55s cubic-bezier(0.16, 1, 0.3, 1);
    --heading-weight: 800;
    --body-line-height: 1.65;
}

body { color: var(--color-text); line-height: var(--body-line-height); background: var(--color-surface); }
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, 0.7) inset,
        0 10px 28px rgba(2, 6, 23, 0.08),
        0 2px 8px rgba(2, 6, 23, 0.06);
    background: #ffffff;
    transition: var(--transition);
    border: 1px solid rgba(15, 23, 42, 0.06);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: 0.45s cubic-bezier(0.2, 0.8, 0.2, 1);
    box-shadow:
        0 1px 0 rgba(255, 255, 255, 0.65) inset,
        0 10px 24px rgba(2, 6, 23, 0.10);
}
a:not([class]) { color: var(--color-primary); transition: var(--transition); }
a:not([class]):focus { outline: 2px solid rgba(167, 139, 250, 0.55); outline-offset: 3px; }

section, .section, .page-main { background-clip: padding-box; }

/* ========== 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: left-aligned */
.hero-content { text-align: left; max-width: 600px; }

/* testimonials: stacked */
/* 垂直堆叠 */
                .testimonial-list { display: flex; flex-direction: column; gap: var(--space-gap); max-width: 720px; margin: 0 auto; }

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

/* faq: single-column */
.faq-list { max-width: 800px; margin: 0 auto; }

/* stats: inline */
/* 水平排列 */
                .stats-grid { display: flex; justify-content: center; gap: 3rem; }

/* cta: full-bg */
.cta-section {
    background:
        radial-gradient(1200px 500px at 20% -10%, rgba(167, 139, 250, 0.45), rgba(167, 139, 250, 0) 60%),
        radial-gradient(900px 480px at 90% 10%, rgba(14, 165, 233, 0.30), rgba(14, 165, 233, 0) 55%),
        linear-gradient(135deg, #2b2f55 0%, var(--color-primary) 55%, #0f172a 120%);
    color: #ffffff;
    padding: 4rem 2rem;
    box-shadow:
        0 20px 60px rgba(2, 6, 23, 0.22),
        0 1px 0 rgba(255, 255, 255, 0.12) inset;
    border-top: 1px solid rgba(255, 255, 255, 0.10);
    border-bottom: 1px solid rgba(0, 0, 0, 0.10);
}

/* Page Layout: full-width */
/* 无侧边栏, 全宽 */
            .page-main { max-width: 1200px; 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, 0.85) inset,
        0 20px 55px rgba(2, 6, 23, 0.16),
        0 0 0 1px rgba(167, 139, 250, 0.22) inset,
        0 0 28px rgba(167, 139, 250, 0.38),
        0 0 52px rgba(167, 139, 250, 0.18);
    animation: glowPulse 2.2s ease-in-out infinite;
}
a:not([class]):hover { color: var(--color-accent); }
.card { border-left: 3px solid rgba(167, 139, 250, 0.95); }
header, .header, .navbar {
    box-shadow:
        0 1px 0 rgba(255, 255, 255, 0.7) inset,
        0 12px 28px rgba(2, 6, 23, 0.10),
        0 0 0 1px rgba(15, 23, 42, 0.04);
    background: rgba(255, 255, 255, 0.72);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(15, 23, 42, 0.06);
}

@keyframes glowPulse {
    0% { filter: saturate(1) brightness(1); }
    50% { filter: saturate(1.05) brightness(1.02); }
    100% { filter: saturate(1) brightness(1); }
}

/* 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; }
}