:root {
    --color-primary: #7c3aed;
    --color-primary-dark: #2e1065;
    --color-accent: #06b6d4;
    --color-surface: #f5f3ff;
    --color-text: #1e1b4b;
    --rgb-primary: 124, 58, 237;
    --rgb-accent: 6, 182, 212;
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --shadow-sm: 0 2px 4px -2px rgba(var(--rgb-primary), 0.14), 0 6px 12px rgba(var(--rgb-accent), 0.06);
    --shadow-md: inset 0 1px 0 rgba(255, 255, 255, 0.65), 0 8px 24px -8px rgba(var(--rgb-primary), 0.18), 0 16px 40px -12px rgba(var(--rgb-accent), 0.12);
    --shadow-lg: 0 12px 32px -8px rgba(var(--rgb-primary), 0.22), 0 32px 64px -12px rgba(var(--rgb-accent), 0.16);
    --space-section: 4.5rem;
    --space-card: 1.75rem;
    --space-gap: 1.5rem;
    --transition: 0.45s 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(circle at 12% 18%, rgba(var(--rgb-primary), 0.10) 0%, transparent 42%),
        radial-gradient(circle at 88% 8%, rgba(var(--rgb-accent), 0.12) 0%, transparent 48%),
        linear-gradient(150deg, #f5f3ff 0%, #ecfeff 55%, #fdf4ff 100%);
    background-attachment: fixed;
}
h1, h2, h3, h4 { font-weight: var(--heading-weight); color: var(--color-primary-dark); }
section, .section { padding-top: var(--space-section); padding-bottom: var(--space-section); }
.card, [class*="card"] {
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: var(--space-card);
    transition: var(--transition);
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.96) 0%, rgba(237, 233, 254, 0.78) 50%, rgba(236, 254, 255, 0.82) 100%);
    outline: 1px solid rgba(var(--rgb-primary), 0.10);
    outline-offset: -1px;
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    background: linear-gradient(135deg, #7c3aed 0%, #4f46e5 50%, #06b6d4 100%);
    color: #fff;
    box-shadow: 0 10px 24px -10px rgba(var(--rgb-primary), 0.45), 0 4px 16px rgba(var(--rgb-accent), 0.20);
    text-shadow: 0 1px 2px rgba(30, 27, 75, 0.15);
}
a:not([class]) { color: var(--color-primary); transition: var(--transition); }

/* ========== 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: horizontal */
/* 水平滚动 */
.feature-list { display: flex; gap: var(--space-gap); overflow-x: auto; scroll-snap-type: x mandatory; }
.feature-list > * { flex: 0 0 300px; scroll-snap-align: start; }

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

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

/* partners: scroll */
/* 自动滚动 */
.partner-grid { display: flex; gap: 2rem; overflow: hidden; animation: partnerScroll 24s linear infinite; }
@keyframes partnerScroll { 0% { transform: translateX(0); } 100% { transform: translateX(-50%); } }

/* 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: split */
.cta-inner { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 2rem; }

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

/* 条件性装饰 */
a:not([class]):hover { color: var(--color-accent); text-shadow: 0 0 12px rgba(var(--rgb-accent), 0.25); }
header, .header, .navbar {
    box-shadow: var(--shadow-sm), 0 8px 24px -12px rgba(var(--rgb-primary), 0.12);
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.78), rgba(255, 255, 255, 0.40));
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
}

/* 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; }
}