:root {
    --color-primary: #8b5cf6;
    --color-primary-dark: #5b21b6;
    --color-accent: #c4b5fd;
    --color-surface: #1e1b4b;
    --color-text: #ddd6fe;
    --rgb-primary: 139,92,246;
    --rgb-accent: 196,181,253;
    --radius-sm: 0;
    --radius-md: 2px;
    --radius-lg: 4px;
    --radius-xl: 6px;
    --shadow-sm: none;
    --shadow-md: 0 4px 20px rgba(139,92,246,0.15), 0 2px 8px rgba(0,0,0,0.3);
    --shadow-lg: 0 8px 40px rgba(139,92,246,0.25), 0 4px 16px rgba(0,0,0,0.4);
    --space-section: 3rem;
    --space-card: 1.25rem;
    --space-gap: 1rem;
    --transition: 0.5s cubic-bezier(0.68, -0.55, 0.27, 1.55);
    --heading-weight: 600;
    --body-line-height: 1.6;
}

body {
    background: linear-gradient(135deg, #0f0a2e 0%, #1e1b4b 50%, #0f0a2e 100%);
    color: var(--color-text);
    line-height: var(--body-line-height);
}
h1, h2, h3, h4 { font-weight: var(--heading-weight); }
section, .section { padding-top: var(--space-section); padding-bottom: var(--space-section); }
.card, [class*="card"] {
    background: linear-gradient(145deg, #2d2a5e 0%, #1e1b4b 100%);
    border: 2px solid transparent;
    border-image: linear-gradient(135deg, #8b5cf6, #c4b5fd, #8b5cf6) 1;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: var(--space-card);
    transition: var(--transition);
}
.btn, button[class*="btn"], a[class*="btn"] {
    background: linear-gradient(135deg, #8b5cf6, #6d28d9);
    border: none;
    border-radius: var(--radius-md);
    color: #fff;
    transition: var(--transition);
}
.btn:hover, button[class*="btn"]:hover, a[class*="btn"]:hover {
    background: linear-gradient(135deg, #a78bfa, #8b5cf6);
    box-shadow: 0 4px 24px rgba(139,92,246,0.4);
}
a:not([class]) { color: var(--color-accent); transition: var(--transition); }
a:not([class]):hover { color: #e0d6ff; text-shadow: 0 0 12px rgba(196,181,253,0.6); }

/* ========== Section Layout Variants ========== */

/* news: featured-left */
.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; }
.news-grid > * {
    background: linear-gradient(145deg, #2d2a5e 0%, #1e1b4b 100%);
    border: 2px solid transparent;
    border-image: linear-gradient(135deg, #8b5cf6, #c4b5fd) 1;
    border-radius: var(--radius-md);
    padding: 1.5rem;
    transition: var(--transition);
}

/* features: grid-4 */
.feature-list { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); }
.feature-list > * {
    background: linear-gradient(145deg, #2d2a5e 0%, #1e1b4b 100%);
    border: 2px solid transparent;
    border-image: linear-gradient(135deg, #8b5cf6, #c4b5fd) 1;
    border-radius: var(--radius-md);
    padding: 1.5rem;
    transition: var(--transition);
}

/* hero: centered */
.hero-content { text-align: center; max-width: 800px; margin: 0 auto; }
.hero-content h1 {
    background: linear-gradient(135deg, #c4b5fd, #8b5cf6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* testimonials: carousel */
.testimonial-list { display: flex; overflow: hidden; }
.testimonial-list > * { flex: 0 0 100%; }
.testimonial-list > * {
    background: linear-gradient(145deg, #2d2a5e 0%, #1e1b4b 100%);
    border: 2px solid transparent;
    border-image: linear-gradient(135deg, #8b5cf6, #c4b5fd) 1;
    border-radius: var(--radius-lg);
    padding: 2rem;
}

/* partners: grid-6 */
.partner-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: var(--space-gap); align-items: center; }
.partner-grid > * {
    background: linear-gradient(145deg, #2d2a5e 0%, #1e1b4b 100%);
    border: 2px solid transparent;
    border-image: linear-gradient(135deg, #8b5cf6, #c4b5fd) 1;
    border-radius: var(--radius-md);
    padding: 1rem;
    transition: var(--transition);
}

/* faq: two-column */
.faq-list { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-gap); }
.faq-list > * {
    background: linear-gradient(145deg, #2d2a5e 0%, #1e1b4b 100%);
    border: 2px solid transparent;
    border-image: linear-gradient(135deg, #8b5cf6, #c4b5fd) 1;
    border-radius: var(--radius-md);
    padding: 1.5rem;
}

/* stats: inline */
.stats-grid { display: flex; justify-content: center; gap: 3rem; }
.stats-grid > * {
    background: linear-gradient(145deg, #2d2a5e 0%, #1e1b4b 100%);
    border: 2px solid transparent;
    border-image: linear-gradient(135deg, #8b5cf6, #c4b5fd) 1;
    border-radius: var(--radius-lg);
    padding: 1.5rem 2rem;
}

/* cta: split */
.cta-inner { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 2rem; }
.cta-inner > * {
    background: linear-gradient(145deg, #2d2a5e 0%, #1e1b4b 100%);
    border: 2px solid transparent;
    border-image: linear-gradient(135deg, #8b5cf6, #c4b5fd) 1;
    border-radius: var(--radius-md);
    padding: 1.5rem;
}

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

/* 条件性装饰 */
.card:hover, [class*="card"]:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 48px rgba(139,92,246,0.3), 0 6px 24px rgba(0,0,0,0.5);
    border-image: linear-gradient(135deg, #c4b5fd, #8b5cf6) 1;
}
header, .header, .navbar { background: transparent; }
header { border-bottom: 2px solid transparent; border-image: linear-gradient(90deg, #8b5cf6, #c4b5fd, #8b5cf6) 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; }
}