:root {
    --color-primary: #1f3a2a;
    --color-primary-dark: #0f2418;
    --color-accent: #c44536;
    --color-surface: #f5f1e8;
    --color-text: #1a1a1a;
    --rgb-primary: 31,58,42;
    --rgb-accent: 196,69,54;
    --radius-sm: 12px;
    --radius-md: 16px;
    --radius-lg: 20px;
    --radius-xl: 24px;
    --shadow-sm: 0 2px 6px rgba(17,17,17,0.08), 0 1px 0 rgba(245,241,232,0.65) inset;
    --shadow-md: 0 4px 10px rgba(17,17,17,0.06), 0 18px 36px -14px rgba(17,17,17,0.14);
    --shadow-lg: 0 8px 20px rgba(17,17,17,0.08), 0 26px 60px -22px rgba(17,17,17,0.18);
    --space-section: 5rem;
    --space-card: 2rem;
    --space-gap: 1.5rem;
    --transition: 0.38s cubic-bezier(0.2, 0.8, 0.2, 1);
    --heading-weight: 800;
    --body-line-height: 1.6;
}

body { color: var(--color-text); line-height: var(--body-line-height); background: var(--color-surface); }
h1, h2, h3, h4 { font-weight: var(--heading-weight); color: inherit; }
section, .section { padding-top: var(--space-section); padding-bottom: var(--space-section); }
.card, [class*="card"] { border-radius: var(--radius-lg); box-shadow: 0 4px 8px rgba(0,0,0,0.05), 0 20px 40px -10px rgba(0,0,0,0.12); padding: var(--space-card); transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition), background var(--transition), filter var(--transition); border: 1px solid rgba(26,26,26,0.08); background: rgba(255,255,255,0.55); backdrop-filter: blur(6px); }
.btn, button[class*="btn"], a[class*="btn"] { border-radius: var(--radius-md); transition: background var(--transition), color var(--transition), box-shadow var(--transition), transform var(--transition), border-color var(--transition); border: 1px solid rgba(26,26,26,0.12); }
a:not([class]) { color: var(--color-primary); transition: color var(--transition), text-shadow var(--transition), opacity var(--transition); text-decoration-thickness: from-font; text-underline-offset: 0.15em; }
a:not([class]):focus { outline: 2px solid rgba(var(--rgb-accent),0.35); outline-offset: 3px; }

.card:hover, [class*="card"]:hover { transform: translateY(-6px); box-shadow: 0 10px 24px rgba(0,0,0,0.08), 0 30px 70px -26px rgba(0,0,0,0.20), 0 0 0 1px rgba(var(--rgb-accent),0.18) inset; border-color: rgba(var(--rgb-accent),0.22); background: rgba(255,255,255,0.72); }

a:not([class]):hover { color: var(--color-accent); text-shadow: 0 10px 22px rgba(196,69,54,0.18); }

/* ========== 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-4 */
.feature-list { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); }

/* 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: centered */
.partner-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 2rem; }

/* faq: single-column */
.faq-list { max-width: 800px; margin: 0 auto; }

/* stats: grid-4 */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-gap); text-align: center; }

/* cta: centered */
.cta-inner { text-align: center; max-width: 700px; margin: 0 auto; }

/* Page Layout: full-width */
/* 无侧边栏, 全宽 */
            .page-main { max-width: 1200px; margin: 0 auto; }

/* 条件性装饰 */
header, .header, .navbar { background: transparent; border-bottom: 1px solid rgba(26,26,26,0.06); }

/* 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; --radius-lg: 18px; --radius-md: 14px; }
    .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; }
}