:root {
    --color-primary: #4f46e5;
    --color-primary-dark: #1e1b4b;
    --color-accent: #06b6d4;
    --color-surface: #eef2ff;
    --color-text: #0f172a;
    --rgb-primary: 79,70,229;
    --rgb-accent: 6,182,212;
    --radius-sm: 12px;
    --radius-md: 20px;
    --radius-lg: 28px;
    --radius-xl: 44px;
    --shadow-sm: 0 2px 8px rgba(15,23,42,.05), 0 12px 24px -10px rgba(var(--rgb-primary),.22);
    --shadow-md: 0 4px 12px rgba(15,23,42,.04), 0 24px 48px -16px rgba(var(--rgb-primary),.22), 0 48px 72px -28px rgba(var(--rgb-accent),.14);
    --shadow-lg: 0 12px 28px rgba(15,23,42,.06), 0 48px 96px -20px rgba(var(--rgb-primary),.26), 0 72px 120px -36px rgba(var(--rgb-accent),.18);
    --space-section: 3.5rem;
    --space-card: 1.375rem;
    --space-gap: 1.125rem;
    --transition: 0.5s cubic-bezier(0.22, 1, 0.36, 1);
    --heading-weight: 800;
    --body-line-height: 1.65;
}

/* 基础覆盖 */
body {
    color: var(--color-text);
    line-height: var(--body-line-height);
    background:
        radial-gradient(60rem 40rem at 90% -10%, rgba(var(--rgb-accent),.09), transparent 60%),
        radial-gradient(70rem 48rem at -10% 110%, rgba(var(--rgb-primary),.07), transparent 55%),
        linear-gradient(180deg, #ffffff 0%, #eef4ff 100%);
}
h1, h2, h3, h4 { font-weight: var(--heading-weight); }
section, .section {
    padding-top: var(--space-section);
    padding-bottom: var(--space-section);
    background: linear-gradient(180deg, #ffffff 0%, rgba(var(--rgb-primary),.025) 100%);
}
.card, [class*="card"] {
    border-radius: var(--radius-lg);
    box-shadow:
        var(--shadow-md),
        inset 0 1px 0 rgba(255,255,255,.85);
    padding: var(--space-card);
    transition: var(--transition);
    background:
        radial-gradient(72rem 28rem at 85% -10%, rgba(var(--rgb-accent),.12), transparent 60%),
        linear-gradient(180deg, #ffffff 0%, #f4f7ff 100%);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: calc(var(--radius-md) + 4px);
    transition: var(--transition);
    box-shadow:
        0 12px 28px -12px rgba(var(--rgb-primary),.5),
        inset 0 1px 0 rgba(255,255,255,.18);
}
a:not([class]) {
    color: var(--color-primary);
    transition: var(--transition);
    text-decoration-color: rgba(var(--rgb-primary),.3);
    text-underline-offset: 3px;
}

/* ========== 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-3 */
.feature-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }

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

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

/* partners: grid-6 */
.partner-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: var(--space-gap); align-items: center; }

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

/* stats: grid-3 */
.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); text-align: center; }

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

/* 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 4px 24px rgba(var(--rgb-accent),.35);
}
.hero, [class*="hero"], section:first-of-type {
    background:
        radial-gradient(72rem 36rem at 85% -10%, rgba(var(--rgb-accent),.35), transparent 60%),
        radial-gradient(48rem 28rem at -10% 120%, rgba(255,255,255,.06), transparent 55%),
        linear-gradient(135deg, #0b1020 0%, #1e1b4b 45%, #4338ca 100%);
}
.card {
    border-left: 3px solid var(--color-accent);
    background-image:
        linear-gradient(90deg, rgba(var(--rgb-accent),.18), rgba(var(--rgb-accent),.18) 3px, transparent 3px),
        radial-gradient(72rem 28rem at 85% -10%, rgba(var(--rgb-accent),.10), transparent 60%),
        linear-gradient(180deg, #ffffff 0%, #f4f7ff 100%);
}
header, .header, .navbar {
    background: linear-gradient(180deg, rgba(255,255,255,.84) 0%, rgba(255,255,255,.64) 100%);
    backdrop-filter: blur(16px) saturate(1.8);
    -webkit-backdrop-filter: blur(16px) saturate(1.8);
    box-shadow:
        inset 0 -1px 0 rgba(15,23,42,.06),
        0 12px 32px -12px rgba(15,23,42,.12),
        0 24px 48px -24px rgba(var(--rgb-primary),.18);
}

/* 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: 2.25rem;
        --space-card: 1.125rem;
        --space-gap: 0.875rem;
    }
    .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; }
}