:root {
    --color-primary: #ff4d00;
    --color-primary-dark: #7a1e00;
    --color-accent: #f2ff00;
    --color-surface: #f5efe6;
    --color-text: #131313;
    --rgb-primary: 255,77,0;
    --rgb-accent: 242,255,0;
    --radius-sm: 2px;
    --radius-md: 4px;
    --radius-lg: 4px;
    --radius-xl: 6px;
    --shadow-sm: 0 0 0 1px #131313, 3px 3px 0 var(--color-primary-dark);
    --shadow-md: 0 0 0 2px #131313, 4px 4px 0 var(--color-primary-dark);
    --shadow-lg: 0 0 0 2px #131313, 6px 6px 0 var(--color-primary-dark);
    --space-section: 5.5rem;
    --space-card: 1.75rem;
    --space-gap: 1.25rem;
    --transition: 0.15s cubic-bezier(.2,.8,.2,1);
    --heading-weight: 600;
    --body-line-height: 1.6;
}

/* 基础覆盖 */
body { color: var(--color-text); background-color: var(--color-surface); line-height: var(--body-line-height); }
h1, h2, h3, h4 { font-weight: var(--heading-weight); text-shadow: 2px 2px 0 var(--color-accent); }
section, .section { padding-top: var(--space-section); padding-bottom: var(--space-section); background-color: var(--color-surface); }
.card, [class*="card"] { border-radius: var(--radius-lg); box-shadow: var(--shadow-md); 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); background: #ffe680; box-shadow: 0 0 0 1px var(--color-text), 4px 4px 0 var(--color-text); }
.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); background: #ffb3b3; box-shadow: 0 0 0 1px var(--color-text), 4px 4px 0 var(--color-text); }

/* hero: split */
/* 左文右图 */
.hero-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 1.6rem; align-items: center; background: #b3d9ff; box-shadow: 0 0 0 1px var(--color-text), 4px 4px 0 var(--color-text); }

/* testimonials: grid-3 */
.testimonial-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); background: #b3ffb3; box-shadow: 0 0 0 1px var(--color-text), 4px 4px 0 var(--color-text); }

/* partners: grid-6 */
.partner-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: var(--space-gap); align-items: center; background: #ffd9b3; box-shadow: 0 0 0 1px var(--color-text), 4px 4px 0 var(--color-text); }

/* faq: two-column */
.faq-list { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-gap); background: #d9b3ff; box-shadow: 0 0 0 1px var(--color-text), 4px 4px 0 var(--color-text); }

/* stats: grid-3 */
.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); text-align: center; background: #ffb3d9; box-shadow: 0 0 0 1px var(--color-text), 4px 4px 0 var(--color-text); }

/* cta: full-bg */
.cta-section { background: var(--color-primary); color: var(--color-surface); padding: 4.5rem 2rem; box-shadow: 0 0 0 1px var(--color-text), 4px 4px 0 var(--color-text); }

/* 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 var(--color-primary-dark); }
.card { border: 1px solid var(--color-text); background-color: #fffdf7; }
header, .header, .navbar { box-shadow: 0 4px 0 var(--color-text); }

/* 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: 0.9rem; --space-gap: 0.65rem; }
    .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; }
}