:root{--bg-primary:#fff;--bg-secondary:#fafbfc;--bg-accent:#f0f7ff;--text-primary:#1a1a1a;--text-secondary:#4a5568;--text-muted:#718096;--accent-primary:#2563eb;--accent-secondary:#1d4ed8;--success:#047857;--warning:#d97706;--border-light:#e5e7eb;--border-medium:#d1d5db;--shadow-sm:0 1px 2px 0 rgba(0,0,0,0.05);--shadow-md:0 4px 6px -1px rgba(0,0,0,0.1);--shadow-lg:0 10px 15px -3px rgba(0,0,0,0.1);--radius-sm:6px;--radius-md:8px;--radius-lg:12px;--content-width:1140px;--spacing-unit:8px}*{margin:0;padding:0;box-sizing:border-box}html{scroll-behavior:smooth;font-size:16px}body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;background:var(--bg-secondary);color:var(--text-primary);line-height:1.75;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.mobile-container{max-width:var(--content-width);margin:0 auto;min-height:100vh;background:var(--bg-secondary)}header{position:relative}main{position:relative;min-height:60vh}.nav-container{background:var(--bg-primary);border-bottom:1px solid var(--border-light);position:sticky;top:0;z-index:1000;box-shadow:var(--shadow-sm)}.nav-tabs{display:flex;gap:0;list-style:none;overflow-x:auto;scrollbar-width:thin;scrollbar-color:var(--border-medium) transparent;max-width:var(--content-width);margin:0 auto;padding:0 calc(var(--spacing-unit)*2)}.nav-tabs::-webkit-scrollbar{height:4px}.nav-tabs::-webkit-scrollbar-track{background:transparent}.nav-tabs::-webkit-scrollbar-thumb{background:var(--border-medium);border-radius:2px}.nav-tabs li{flex-shrink:0}.nav-tab{display:block;padding:calc(var(--spacing-unit)*2) calc(var(--spacing-unit)*3);color:var(--text-secondary);text-decoration:none;font-size:15px;font-weight:500;border-bottom:3px solid transparent;transition:all .2s ease;white-space:nowrap}.nav-tab:hover{color:var(--accent-primary);background:var(--bg-accent)}.nav-tab.selected{color:var(--accent-primary);border-bottom-color:var(--accent-primary);font-weight:600}.page-header{background:linear-gradient(135deg,var(--bg-primary) 0%,var(--bg-accent) 100%);padding:calc(var(--spacing-unit) * 6) calc(var(--spacing-unit) * 2);text-align:center;border-bottom:1px solid var(--border-light)}.page-title{font-size:clamp(28px,4vw,42px);font-weight:700;color:var(--text-primary);letter-spacing:-0.02em;margin:0;line-height:1.2;max-width:900px;margin:0 auto}.category-overview-title{font-size:clamp(20px,3vw,28px);font-weight:600;color:var(--text-primary);text-align:center;margin:calc(var(--spacing-unit) * 4) auto calc(var(--spacing-unit) * 3);padding:0 calc(var(--spacing-unit) * 2);max-width:var(--content-width)}.breadcrumb-nav{max-width:var(--content-width);margin:0 auto;padding:calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 2);background:var(--bg-primary)}.breadcrumb-list{display:flex;flex-wrap:wrap;align-items:center;gap:calc(var(--spacing-unit));list-style:none;margin:0;padding:0;font-size:14px}.breadcrumb-list li{display:inline-flex;align-items:center}.breadcrumb-list a{color:var(--text-secondary);text-decoration:none;transition:color 0.2s;padding:calc(var(--spacing-unit) / 2) calc(var(--spacing-unit));border-radius:var(--radius-sm);display:inline-flex;align-items:center;gap:calc(var(--spacing-unit) / 2)}.breadcrumb-list a:hover{color:var(--accent-primary);background:var(--bg-accent)}.category-preview{max-width:var(--content-width);margin:calc(var(--spacing-unit) * 4) auto;padding:0 calc(var(--spacing-unit) * 2)}.category-header-row{display:flex;justify-content:space-between;align-items:center;margin-bottom:calc(var(--spacing-unit) * 2);flex-wrap:wrap;gap:calc(var(--spacing-unit) * 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h3{font-size:32px;font-weight:700;color:var(--text-primary);margin-bottom:calc(var(--spacing-unit) * 4);text-align:center;line-height:1.3}.section-intro{text-align:center;color:var(--text-secondary);font-size:16px;margin-bottom:calc(var(--spacing-unit) * 4);line-height:1.75}.category-links-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:calc(var(--spacing-unit) * 3)}.category-link-card{display:block;padding:calc(var(--spacing-unit) * 3);background:var(--bg-secondary);border:2px solid var(--border-light);border-radius:var(--radius-md);text-decoration:none;transition:all 0.3s ease}.category-link-card:hover{background:var(--bg-primary);border-color:var(--accent-primary);box-shadow:var(--shadow-md);transform:translateY(-2px)}.category-link-card strong{display:block;color:var(--text-primary);font-size:18px;margin-bottom:calc(var(--spacing-unit));font-weight:600;line-height:1.4}.category-link-card p{color:var(--text-secondary);font-size:14px;line-height:1.6;margin:0}#floatingContactButton,.contact-floating{position:fixed;bottom:calc(var(--spacing-unit) * 3);right:calc(var(--spacing-unit) * 3);width:60px;height:60px;background:var(--accent-primary);border-radius:50%;box-shadow:var(--shadow-lg);cursor:pointer;transition:all 0.3s ease;z-index:999;display:flex;align-items:center;justify-content:center;border:3px solid var(--bg-primary)}#floatingContactButton::before,.contact-floating::before{content:'💬';font-size:28px}#floatingContactButton:hover,.contact-floating:hover{background:var(--accent-secondary);transform:scale(1.1);box-shadow:0 12px 24px rgba(37,99,235,0.3)}.modal{display:none;position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,0.6);z-index:2000;align-items:center;justify-content:center;padding:calc(var(--spacing-unit) * 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