:root {
    --color-primary: #2e4059;
    --color-primary-dark: #172030;
    --color-accent: #3b82f6;
    --color-surface: #e2e8f0;
    --color-card: #ffffff;
    --color-text: #1c2938;
    --rgb-primary: 46,64,89;
    --rgb-accent: 59,130,246;
    --radius-sm: 2px;
    --radius-md: 3px;
    --radius-lg: 4px;
    --radius-xl: 4px;
    --shadow-sm: 2px 2px 0 0 #cbd5e1;
    --shadow-md: 4px 4px 0 0 #94aabf, 8px 8px 0 0 #d3dce4;
    --shadow-lg: 6px 6px 0 0 #7089a1, 12px 12px 0 0 #b4c2d0, 18px 18px 0 0 #dde5ec;
    --space-section: 4.5rem;
    --space-card: 1.75rem;
    --space-gap: 1.25rem;
    --transition: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --heading-weight: 600;
    --body-line-height: 1.7;
}

body {
    color: var(--color-text);
    background-color: var(--color-surface);
    line-height: var(--body-line-height);
}

h1, h2, h3, h4 {
    color: var(--color-primary-dark);
    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);
    background: var(--color-card);
    box-shadow: var(--shadow-md);
    padding: var(--space-card);
    transition: var(--transition);
}

.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

a:not([class]) {
    color: var(--color-primary);
    transition: var(--transition);
}

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

/* news: list-view */
/* 列表模式 (图左文右) */
.news-grid {
    display: flex;
    flex-direction: column;
    gap: var(--space-gap);
}

.news-grid .card {
    display: grid;
    grid-template-columns: 280px 1fr;
}

/* 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: split */
/* 左文右图 */
.hero-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    align-items: center;
}

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

/* partners: grid-6 */
.partner-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: var(--space-gap);
    align-items: center;
}

/* faq: two-column */
.faq-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-gap);
}

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

/* 条件性装饰 */
a:not([class]):hover {
    color: var(--color-accent);
}

.card {
    border-left: 3px solid var(--color-accent);
}

header, .header, .navbar {
    background: transparent;
}

/* 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: 1.8rem;
        --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;
    }
}