:root {
    --color-primary: #b33a3a;
    --color-primary-dark: #6e1e1e;
    --color-accent: #d9534f;
    --color-surface: #f9e6e6;
    --color-text: #3b1f1f;
    --rgb-primary: 179,58,58;
    --rgb-accent: 217,83,79;
    --radius-sm: 1px;
    --radius-md: 3px;
    --radius-lg: 4px;
    --radius-xl: 4px;
    --shadow-sm: 4px 4px 0px #8a1f1f, -2px -2px 0px #d17a7a;
    --shadow-md: 5px 5px 0px #7a1a1a, -3px -3px 0px #c96f6f;
    --shadow-lg: 6px 6px 0px #6a1616, -4px -4px 0px #b46161;
    --space-section: 4rem;
    --space-card: 1.5rem;
    --space-gap: 1.3rem;
    --transition: 0.15s cubic-bezier(0.25, 0.8, 0.25, 1);
    --heading-weight: 700;
    --body-line-height: 1.65;
}

/* 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-md);
    box-shadow: var(--shadow-md);
    padding: var(--space-card);
    transition: var(--transition);
    border-style: solid;
    border-width: 3px;
    border-color: var(--color-primary-dark);
    outline-color: transparent;
    outline-style: none;
}
.btn,
button[class*="btn"],
a[class*="btn"] {
    border-radius: var(--radius-sm);
    transition: var(--transition);
    border-style: solid;
    border-width: 2px;
    border-color: var(--color-accent);
}
a:not([class]) {
    color: var(--color-primary);
    transition: var(--transition);
    text-shadow: 1px 1px 0 rgba(179, 58, 58, 0.3);
}

/* ========== 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-4 */
.feature-list {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-gap);
}

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

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

/* partners: centered */
.partner-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 2rem;
}

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

/* stats: big-number */
/* 大数字居中 */
.stats-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 2rem;
}
.stats-grid .stat-value {
    font-size: 3rem;
}

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

/* 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: 2px 2px 0 rgba(217, 83, 79, 0.5);
}
.card {
    border-left: 3px solid var(--color-primary-dark);
    box-shadow: 4px 4px 0px var(--color-primary-dark), -3px -3px 0px var(--color-accent);
    border-radius: var(--radius-sm);
}

/* 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;
    }
}