:root {
    --color-primary: #6d28d9;
    --color-primary-dark: #4c1d95;
    --color-accent: #facc15;
    --color-surface: #f5f3ff;
    --color-bg: #fafaf9;
    --color-text: #1c1917;
    --color-block-a: #f5f3ff;
    --color-block-b: #fef3c7;
    --color-block-c: #ecfdf5;
    --color-block-d: #fff1f2;
    --rgb-primary: 109,40,217;
    --rgb-accent: 250,204,21;
    --radius-sm: 0px;
    --radius-md: 2px;
    --radius-lg: 4px;
    --radius-xl: 0px;
    --shadow-sm: 3px 3px 0 0 var(--color-primary-dark);
    --shadow-md: 4px 4px 0 0 var(--color-primary), 8px 8px 0 0 rgba(var(--rgb-accent), 0.9);
    --shadow-lg: 6px 6px 0 0 var(--color-primary-dark), 12px 12px 0 0 var(--color-accent);
    --space-section: 4.5rem;
    --space-card: 1.75rem;
    --space-gap: 1.5rem;
    --transition: 0.15s cubic-bezier(0.4, 0, 1, 1);
    --heading-weight: 700;
    --body-line-height: 1.65;
    accent-color: var(--color-accent);
}

body {
    background: var(--color-bg);
    color: var(--color-text);
    line-height: var(--body-line-height);
    caret-color: var(--color-accent);
}

h1, h2, h3, h4 { font-weight: var(--heading-weight); }

section, .section {
    padding-top: var(--space-section);
    padding-bottom: var(--space-section);
    box-shadow: inset 0 -2px 0 0 var(--color-text);
}

.card, [class*="card"] {
    border-radius: var(--radius-lg);
    box-shadow: 0 0 0 2px var(--color-text), var(--shadow-md);
    padding: var(--space-card);
    background: var(--color-surface);
    transition: var(--transition);
}

.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    background: var(--color-accent);
    color: var(--color-text);
    box-shadow: 0 0 0 2px var(--color-text), 4px 4px 0 0 var(--color-primary);
    transition: var(--transition);
}

a:not([class]) {
    color: var(--color-primary);
    text-decoration-color: var(--color-accent);
    text-decoration-thickness: 2px;
    transition: var(--transition);
}

/* news: grid-4 */
.news-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: calc(var(--space-gap) * 0.8);
}

/* features: horizontal */
.feature-list {
    display: flex;
    gap: var(--space-gap);
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    background: var(--color-block-b);
    box-shadow: 0 0 0 2px var(--color-text);
    border-radius: var(--radius-sm);
}

.feature-list > * {
    flex: 0 0 300px;
    scroll-snap-align: start;
}

/* hero: split */
.hero-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2.25rem;
    align-items: center;
}

/* testimonials: stacked */
.testimonial-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-gap);
    max-width: 720px;
    margin: 0 auto;
    background: var(--color-block-d);
    box-shadow: 0 0 0 2px var(--color-text);
    border-radius: var(--radius-sm);
}

/* partners: grid-4 */
.partner-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: calc(var(--space-gap) * 1.5);
    align-items: center;
    background: var(--color-block-c);
    box-shadow: 0 0 0 2px var(--color-text);
    border-radius: var(--radius-sm);
}

/* faq: single-column */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
    box-shadow: inset 4px 0 0 0 var(--color-accent);
}

/* stats: grid-4 */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-gap);
    text-align: center;
    background: var(--color-block-a);
    box-shadow: 0 0 0 2px var(--color-text);
    border-radius: var(--radius-sm);
}

/* cta: card-style */
.cta-inner {
    background: var(--color-primary-dark);
    color: #ffffff;
    border-radius: var(--radius-xl);
    padding: 3rem;
    text-align: center;
    box-shadow: 0 0 0 2px var(--color-text), var(--shadow-lg);
}

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

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

.card {
    border-left: 3px solid 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: 2.25rem;
        --space-card: 1.2rem;
        --space-gap: 0.9rem;
    }
    .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; }
}