:root {
    --color-primary: #2c2f4a;
    --color-primary-dark: #1a1c2f;
    --color-accent: #f25c54;
    --color-surface: #f9f7f7;
    --color-text: #222831;
    --rgb-primary: 44,47,74;
    --rgb-accent: 242,92,84;
    --radius-sm: 2px;
    --radius-md: 3px;
    --radius-lg: 0px;
    --radius-xl: 0px;
    --shadow-sm: 4px 4px 0 #c0392b, -4px -4px 0 #7f1c1c;
    --shadow-md: 4px 4px 0 #a33227, -4px -4px 0 #5e1613;
    --shadow-lg: 6px 6px 0 #8c2d20, -6px -6px 0 #4d130f;
    --space-section: 2rem;
    --space-card: 1rem;
    --space-gap: 0.75rem;
    --transition: 0.15s cubic-bezier(0.7, 0, 0.3, 1);
    --heading-weight: 800;
    --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:
        4px 4px 0px 0px rgba(194,54,46,0.9),
        -4px -4px 0px 0px rgba(124,23,19,0.85);
    padding: var(--space-card);
    transition: var(--transition);
    border: 3px solid #7a1c1a;
    background: linear-gradient(135deg, #f7efee 0%, #e6d8d7 100%);
}
.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    border: 2px solid var(--color-accent);
    background: #f25c54;
    color: #f9f7f7;
    box-shadow:
        4px 4px 0px 0px rgba(194,54,46,0.9),
        -4px -4px 0px 0px rgba(124,23,19,0.85);
    filter: drop-shadow(1px 1px 0px rgba(0,0,0,0.15));
}
a:not([class]) {
    color: var(--color-primary);
    transition: var(--transition);
    text-shadow: 1px 1px 0 #e8d7d7;
    caret-color: var(--color-accent);
    accent-color: var(--color-accent);
}

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

/* news: featured-top */
.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: overlay */
.hero { position: relative; min-height: 70vh; display: flex; align-items: center; }
.hero-content { position: relative; z-index: 1; }

/* 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: with-sidebar */
.faq-wrapper { display: grid; grid-template-columns: 2fr 1fr; gap: 2rem; }

/* stats: grid-3 */
.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); text-align: center; }

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

/* 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-shadow:
        2px 2px 0 #7a1c1a,
        -2px -2px 0 #c1322a;
}
header, .header, .navbar {
    background: var(--color-primary-dark);
    border-bottom: 3px solid var(--color-accent);
    box-shadow:
        4px 4px 0px 0px rgba(194,54,46,0.9),
        -4px -4px 0px 0px rgba(124,23,19,0.85);
    filter: drop-shadow(1px 1px 0 rgba(0,0,0,0.2));
}

/* 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; }
}