/* CSSVariantEngine v3.0 — ch4-aitiyu.com.cn */
/* Palette: violet-amber | Radius: rounded | Shadow: layered */
/* Spacing: tight | Transition: smooth */
/* Section layouts: {"news":"featured-left","features":"grid-4","hero":"minimal","testimonials":"masonry","partners":"scroll","faq":"with-sidebar","stats":"big-number","cta":"centered"} */

:root {
    --color-primary: #6d28d9;
    --color-primary-dark: #4c1d95;
    --color-accent: #ea580c;
    --color-surface: #faf5ff;
    --color-text: #1e1b4b;
    --rgb-primary: 109,40,217;
    --rgb-accent: 234,88,12;
    --radius-sm: 10px;
    --radius-md: 14px;
    --radius-lg: 22px;
    --radius-xl: 30px;
    --shadow-sm: 0 1px 2px rgba(109,40,217,.08), 0 2px 6px rgba(234,88,12,.08), 0 0 0 1px rgba(109,40,217,.06);
    --shadow-md: 0 4px 12px rgba(109,40,217,.12), 0 8px 24px rgba(234,88,12,.1), 0 0 0 1px rgba(109,40,217,.08);
    --shadow-lg: 0 8px 24px rgba(109,40,217,.18), 0 16px 48px rgba(234,88,12,.14), 0 0 0 1px rgba(109,40,217,.1);
    --space-section: 2rem;
    --space-card: 1rem;
    --space-gap: 0.75rem;
    --transition: 0.6s cubic-bezier(0.25, 0.8, 0.25, 1);
    --heading-weight: 600;
    --body-line-height: 1.6;
    --grad-primary: linear-gradient(135deg, #6d28d9 0%, #a855f7 40%, #ec4899 100%);
    --grad-accent: linear-gradient(135deg, #f97316 0%, #f59e0b 50%, #eab308 100%);
    --grad-surface: linear-gradient(160deg, #faf5ff 0%, #fff7ed 50%, #fdf2f8 100%);
    --grad-card: linear-gradient(145deg, rgba(255,255,255,.96) 0%, rgba(250,245,255,.92) 40%, rgba(255,247,237,.88) 100%);
}

/* 基础覆盖 */
body {
    background: radial-gradient(circle at 10% 20%, rgba(168,85,247,.08) 0%, transparent 40%),
                radial-gradient(circle at 90% 80%, rgba(249,115,22,.08) 0%, transparent 40%),
                linear-gradient(135deg, #faf5ff 0%, #fff7ed 50%, #fdf2f8 100%);
    background-attachment: fixed;
    color: var(--color-text);
    line-height: var(--body-line-height);
}
h1, h2, h3, h4 {
    font-weight: var(--heading-weight);
    text-shadow: 0 1px 2px rgba(109,40,217,.08);
}
section, .section {
    padding-top: var(--space-section);
    padding-bottom: var(--space-section);
    background: linear-gradient(180deg, rgba(109,40,217,.02) 0%, rgba(249,115,22,.02) 100%);
}
.card, [class*="card"] {
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: var(--space-card);
    transition: var(--transition);
    background: var(--grad-card);
    outline: 1px solid rgba(109,40,217,.08);
    outline-offset: -1px;
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    background: var(--grad-primary);
    color: #fff;
    box-shadow: 0 4px 12px rgba(109,40,217,.25), 0 2px 6px rgba(234,88,12,.15), inset 0 1px 0 rgba(255,255,255,.2);
}
a:not([class]) {
    color: var(--color-primary);
    transition: var(--transition);
    text-decoration-color: rgba(109,40,217,.3);
}

/* ========== 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);
                    background: linear-gradient(135deg, rgba(109,40,217,.05) 0%, rgba(168,85,247,.03) 40%, rgba(236,72,153,.05) 100%);
                    border-radius: var(--radius-lg);
                    outline: 1px solid rgba(109,40,217,.12);
                    outline-offset: -1px;
                    box-shadow: 0 4px 20px rgba(109,40,217,.06);
                }
                .news-grid > *:first-child {
                    grid-row: span 2;
                    background: linear-gradient(160deg, rgba(109,40,217,.06) 0%, rgba(236,72,153,.04) 100%);
                    border-radius: var(--radius-md);
                }

/* features: grid-4 */
.feature-list {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-gap);
    background: linear-gradient(135deg, rgba(249,115,22,.05) 0%, rgba(245,158,11,.03) 50%, rgba(234,179,8,.05) 100%);
    border-radius: var(--radius-lg);
    outline: 1px solid rgba(249,115,22,.12);
    outline-offset: -1px;
    box-shadow: 0 4px 20px rgba(249,115,22,.06);
}

/* hero: minimal */
.hero {
    padding: 2rem 0;
    background: radial-gradient(circle at 20% 30%, rgba(109,40,217,.08) 0%, transparent 50%),
                linear-gradient(135deg, rgba(109,40,217,.04) 0%, rgba(236,72,153,.03) 100%);
}
.hero-content { max-width: 560px; }

/* testimonials: masonry */
.testimonial-list {
    column-count: 2;
    column-gap: var(--space-gap);
    background: linear-gradient(145deg, rgba(14,165,233,.04) 0%, rgba(109,40,217,.04) 50%, rgba(236,72,153,.04) 100%);
    border-radius: var(--radius-lg);
    outline: 1px solid rgba(109,40,217,.1);
    outline-offset: -1px;
}
.testimonial-list > * {
    break-inside: avoid;
    margin-bottom: var(--space-gap);
    background: var(--grad-card);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

/* partners: scroll */
/* 自动滚动 */
.partner-grid {
    display: flex;
    gap: 2rem;
    overflow: hidden;
    animation: partnerScroll 20s linear infinite;
    background: linear-gradient(90deg, rgba(109,40,217,.04) 0%, rgba(249,115,22,.04) 50%, rgba(109,40,217,.04) 100%);
    border-radius: var(--radius-lg);
    outline: 1px solid rgba(109,40,217,.1);
    outline-offset: -1px;
}
@keyframes partnerScroll { 0% { transform: translateX(0); } 100% { transform: translateX(-50%); } }

/* faq: with-sidebar */
/* FAQ 左 + 联系信息右 */
.faq-wrapper {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 2rem;
    background: linear-gradient(135deg, rgba(109,40,217,.05) 0%, rgba(168,85,247,.03) 50%, rgba(249,115,22,.05) 100%);
    border-radius: var(--radius-lg);
    outline: 1px solid rgba(109,40,217,.12);
    outline-offset: -1px;
    box-shadow: 0 4px 20px rgba(109,40,217,.06);
}

/* stats: big-number */
/* 大数字居中 */
.stats-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 2rem;
    background: radial-gradient(circle at 50% 0%, rgba(236,72,153,.08) 0%, transparent 60%),
                linear-gradient(180deg, rgba(109,40,217,.04) 0%, rgba(249,115,22,.04) 100%);
    border-radius: var(--radius-lg);
    outline: 1px solid rgba(236,72,153,.12);
    outline-offset: -1px;
}
.stats-grid .stat-value {
    font-size: 3rem;
    background: linear-gradient(135deg, #6d28d9 0%, #ec4899 50%, #f97316 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 2px 8px rgba(109,40,217,.1);
}

/* cta: centered */
.cta-inner {
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
    background: linear-gradient(135deg, rgba(109,40,217,.08) 0%, rgba(236,72,153,.06) 50%, rgba(249,115,22,.08) 100%);
    border-radius: var(--radius-xl);
    outline: 1px solid rgba(109,40,217,.15);
    outline-offset: -1px;
    box-shadow: 0 8px 32px rgba(109,40,217,.12), 0 4px 16px rgba(249,115,22,.08);
}

/* Page Layout: full-width */
/* 无侧边栏, 全宽 */
            .page-main {
                max-width: 1200px;
                margin: 0 auto;
                background: linear-gradient(180deg, rgba(255,255,255,.5) 0%, rgba(250,245,255,.3) 100%);
                border-radius: var(--radius-xl);
                outline: 1px solid rgba(109,40,217,.08);
                outline-offset: -1px;
            }

/* 条件性装饰 */
.card:hover, [class*="card"]:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    outline-color: rgba(109,40,217,.2);
}
a:not([class]):hover { color: var(--color-accent); }

/* 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; }
}