:root {
    --color-primary: #4a4e69;
    --color-primary-dark: #22223b;
    --color-accent: #9a8c98;
    --color-surface: #f2e9e4;
    --color-text: #3a405a;
    --rgb-primary: 74,78,105;
    --rgb-accent: 154,140,152;
    --radius-sm: 3px;
    --radius-md: 5px;
    --radius-lg: 6px;
    --radius-xl: 8px;
    --shadow-sm: 0 1px 2px rgba(58,64,90,0.07), 0 2px 4px rgba(58,64,90,0.05);
    --shadow-md: 0 3px 6px rgba(34,34,59,0.12), 0 6px 12px rgba(34,34,59,0.08);
    --shadow-lg: 0 8px 12px rgba(34,34,59,0.18), 0 12px 24px rgba(34,34,59,0.1);
    --space-section: 3rem;
    --space-card: 1.25rem;
    --space-gap: 1rem;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --heading-weight: 600;
    --body-line-height: 1.7;
}

/* 基础覆盖 */
body { 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"] {
    border-radius: var(--radius-lg);
    box-shadow:
        0 1px 2px rgba(58,64,90,0.1),
        0 4px 8px rgba(58,64,90,0.06),
        inset 0 0 8px rgba(154,140,152,0.05);
    padding: var(--space-card);
    transition: var(--transition);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
}
a:not([class]) {
    color: var(--color-primary);
    transition: var(--transition);
}

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

/* news: masonry-2 */
/* 两列瀑布流 */
.news-grid {
    column-count: 2;
    column-gap: var(--space-gap);
}
.news-grid .card {
    break-inside: avoid;
    margin-bottom: var(--space-gap);
}

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

/* hero: minimal */
.hero {
    padding: 2rem 0;
}
.hero-content {
    max-width: 560px;
}

/* testimonials: carousel */
/* 单条轮播 */
.testimonial-list {
    display: flex;
    overflow: hidden;
}
.testimonial-list > * {
    flex: 0 0 100%;
}

/* partners: scroll */
/* 自动滚动 */
.partner-grid {
    display: flex;
    gap: 2rem;
    overflow: hidden;
    animation: partnerScroll 20s linear infinite;
}
@keyframes partnerScroll {
    0% {
        transform: translateX(0);
    }
    100% {
        transform: translateX(-50%);
    }
}

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

/* Page Layout: narrow-centered */
/* 窄版居中 */
.page-main {
    max-width: 860px;
    margin: 0 auto;
}

/* 条件性装饰 */
.card:hover, [class*="card"]:hover {
    transform: translateY(-4px);
    box-shadow:
        0 10px 16px rgba(34,34,59,0.25),
        0 20px 28px rgba(34,34,59,0.15),
        inset 0 0 12px rgba(154,140,152,0.12);
}
a:not([class]):hover {
    color: var(--color-accent);
}
.card {
    border-left: 3px solid var(--color-primary);
}
header, .header, .navbar {
    box-shadow: 0 3px 12px rgba(34,34,59,0.08);
}

/* 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;
    }
}