:root {
    --color-primary: #c0392b;
    --color-primary-dark: #7b241c;
    --color-accent: #e67e22;
    --color-surface: #faf3e0;
    --color-text: #2c3e50;
    --rgb-primary: 192,57,43;
    --rgb-accent: 230,126,34;
    --radius-sm: 2px;
    --radius-md: 3px;
    --radius-lg: 4px;
    --radius-xl: 6px;
    --shadow-sm: 3px 3px 0px 0px rgba(192,57,43,.25);
    --shadow-md: 4px 4px 0px 0px rgba(192,57,43,.3);
    --shadow-lg: 5px 5px 0px 0px rgba(123,36,28,.35);
    --space-section: 3rem;
    --space-card: 1.25rem;
    --space-gap: 1rem;
    --transition: 0.15s ease-in-out;
    --heading-weight: 600;
    --body-line-height: 1.65;
}

/* 基础覆盖 */
body { color: var(--color-text); line-height: var(--body-line-height); background-color: #fdf8f0; }
h1, h2, h3, h4 { font-weight: var(--heading-weight); color: var(--color-primary-dark); }
section, .section { padding-top: var(--space-section); padding-bottom: var(--space-section); }
section:nth-child(even), .section:nth-child(even) { background-color: #f7ede2; }
section:nth-child(odd), .section:nth-child(odd) { background-color: #ffffff; }
.card, [class*="card"] { border-radius: var(--radius-lg); box-shadow: var(--shadow-md); padding: var(--space-card); transition: var(--transition); border: 2px solid var(--color-primary-dark); background-color: #ffffff; }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: var(--transition); border: 2px solid var(--color-primary); color: #ffffff; background-color: var(--color-primary); box-shadow: 3px 3px 0px 0px rgba(192,57,43,.25); }
.btn:hover, button[class*="btn"]:hover, a[class*="btn"]:hover { transform: translate(-1px,-1px); box-shadow: 4px 4px 0px 0px rgba(192,57,43,.35); }
a:not([class]) { color: var(--color-primary); transition: var(--transition); text-decoration-color: var(--color-accent); text-decoration-thickness: 2px; }

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

/* news: featured-left */
/* 左大右小 (1大+2小) */
                .news-grid { display: grid; grid-template-columns: 2fr 1fr; grid-template-rows: auto auto; gap: var(--space-gap); }
                .news-grid > *:first-child { grid-row: span 2; }

/* features: grid-2 */
.feature-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: calc(var(--space-gap) * 1.5); }

/* hero: overlay */
/* 全屏背景+文字覆盖 */
                .hero { position: relative; min-height: 70vh; display: flex; align-items: center; background-color: #2c3e50; }
                .hero-content { position: relative; z-index: 1; color: #fdf8f0; }

/* testimonials: stacked */
/* 垂直堆叠 */
                .testimonial-list { display: flex; flex-direction: column; gap: var(--space-gap); max-width: 720px; margin: 0 auto; }

/* 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: grid-4 */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); text-align: center; }
.stats-grid .stat-item { border: 2px solid var(--color-primary-dark); border-radius: var(--radius-lg); padding: 1rem; box-shadow: 3px 3px 0px 0px rgba(192,57,43,.2); background-color: #ffffff; }

/* cta: split */
.cta-inner { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 2rem; }
.cta-inner .btn { border: 2px solid var(--color-accent); background-color: var(--color-accent); box-shadow: 3px 3px 0px 0px rgba(230,126,34,.3); }

/* Page Layout: narrow-centered */
/* 窄版居中 */
            .page-main { max-width: 860px; margin: 0 auto; }

/* 条件性装饰 */
.card:hover, [class*="card"]:hover { transform: translate(-2px,-2px); box-shadow: 6px 6px 0px 0px rgba(123,36,28,.35); border-color: var(--color-primary); }
a:not([class]):hover { color: var(--color-accent); text-decoration-color: var(--color-primary); }
.card { border: 2px solid var(--color-primary-dark); background-color: #ffffff; }
.card:nth-child(even), [class*="card"]:nth-child(even) { background-color: #faf3e0; }

/* 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; }
}