:root{--primary:#2563eb;--primary-dark:#1e40af;--secondary:#64748b;--success:#10b981;--danger:#ef4444;--warning:#f59e0b;--bg-primary:#ffffff;--bg-secondary:#f8fafc;--bg-tertiary:#f1f5f9;--text-primary:#1e293b;--text-secondary:#64748b;--text-muted:#94a3b8;--border:#e2e8f0;--shadow:0 1px 3px 0 rgba(0,0,0,.1),0 1px 2px 0 rgba(0,0,0,.06);--shadow-lg:0 10px 15px -3px rgba(0,0,0,.1),0 4px 6px -2px rgba(0,0,0,.05)}*{margin:0;padding:0;box-sizing:border-box}html,body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;color:var(--text-primary);line-height:1.6;background:var(--bg-secondary)}.page-container{min-height:100vh;display:flex;flex-direction:column}.container{max-width:1200px;margin:0 auto;padding:0 24px;width:100%}.site-header{background:var(--bg-primary);border-bottom:1px solid var(--border);box-shadow:var(--shadow);position:sticky;top:0;z-index:100}.header-content{max-width:1200px;margin:0 auto;padding:16px 24px;display:flex;justify-content:space-between;align-items:center}.logo{display:flex;align-items:center;gap:8px;font-size:20px;font-weight:700;color:var(--primary);text-decoration:none}.logo svg{width:32px;height:32px;color:var(--primary)}.main-nav{display:flex;gap:24px;align-items:center}.nav-link{color:var(--text-secondary);text-decoration:none;font-weight:500;font-size:15px;transition:color .2s;padding:8px 0}.nav-link:hover,.nav-link.active{color:var(--primary)}.hero-section{background:linear-gradient(135deg,var(--primary)0%,var(--primary-dark)100%);color:#fff;padding:80px 24px;text-align:center}.hero-content{max-width:800px;margin:0 auto}.hero-title{font-size:clamp(32px,5vw,48px);font-weight:800;margin-bottom:16px;line-height:1.2}.hero-subtitle{font-size:clamp(16px,2vw,20px);margin-bottom:32px;opacity:.95;line-height:1.6}.hero-actions{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}.btn-primary,.btn-secondary{padding:12px 24px;border-radius:8px;font-weight:600;font-size:16px;text-decoration:none;display:inline-block;transition:all .2s;border:none;cursor:pointer}.btn-primary{background:#fff;color:var(--primary)}.btn-primary:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}.btn-secondary{background:transparent;color:#fff;border:2px solid white}.btn-secondary:hover{background:#ffffff1a}.tools-section,.education-preview{padding:80px 0}.section-title{font-size:clamp(28px,4vw,36px);font-weight:700;margin-bottom:48px;text-align:center;color:var(--text-primary)}.tools-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px}.tool-card{background:var(--bg-primary);border:1px solid var(--border);border-radius:12px;padding:32px;transition:all .2s;box-shadow:var(--shadow)}.tool-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--primary)}.tool-icon{width:64px;height:64px;background:var(--bg-tertiary);border-radius:12px;display:flex;align-items:center;justify-content:center;margin-bottom:20px;color:var(--primary)}.tool-title{font-size:20px;font-weight:600;margin-bottom:12px;color:var(--text-primary)}.tool-desc{color:var(--text-secondary);margin-bottom:20px;line-height:1.6}.tool-link{color:var(--primary);text-decoration:none;font-weight:600;font-size:15px;transition:gap .2s;display:inline-flex;align-items:center;gap:4px}.tool-link:hover{gap:8px}.education-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:24px}.edu-card{background:var(--bg-primary);border:1px solid var(--border);border-radius:12px;padding:32px;box-shadow:var(--shadow)}.edu-title{font-size:22px;font-weight:600;margin-bottom:12px;color:var(--text-primary)}.edu-desc{color:var(--text-secondary);margin-bottom:20px;line-height:1.6}.edu-link{color:var(--primary);text-decoration:none;font-weight:600;display:inline-flex;align-items:center;gap:4px}.edu-link:hover{gap:8px}.site-footer{background:var(--bg-primary);border-top:1px solid var(--border);padding:60px 0 40px;margin-top:auto}.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:40px;margin-bottom:40px}.footer-section h4{font-size:16px;font-weight:600;margin-bottom:16px;color:var(--text-primary)}.footer-section ul{list-style:none}.footer-section ul li{margin-bottom:12px}.footer-section a{color:var(--text-secondary);text-decoration:none;font-size:14px;transition:color .2s}.footer-section a:hover{color:var(--primary)}.footer-bottom{padding-top:40px;border-top:1px solid var(--border);text-align:center}.footer-bottom p{color:var(--text-secondary);font-size:14px;margin-bottom:8px}.footer-note{font-size:12px;color:var(--text-muted);max-width:600px;margin:0 auto}.company-info{margin-bottom:24px;padding-bottom:24px;border-bottom:1px solid var(--border)}.company-info p{margin-bottom:8px;font-size:14px;color:var(--text-secondary);line-height:1.6}.company-info p:first-child{font-size:16px;color:var(--text-primary);margin-bottom:12px}.content-page{padding:40px 0 80px;flex:1}.page-title{font-size:clamp(32px,4vw,40px);font-weight:700;margin-bottom:16px;color:var(--text-primary)}.page-subtitle{font-size:18px;color:var(--text-secondary);margin-bottom:40px}.content-card{background:var(--bg-primary);border:1px solid var(--border);border-radius:12px;padding:32px;margin-bottom:24px;box-shadow:var(--shadow)}.content-card h2{font-size:24px;font-weight:600;margin-bottom:16px;color:var(--text-primary)}.content-card h3{font-size:20px;font-weight:600;margin-top:24px;margin-bottom:12px;color:var(--text-primary)}.content-card p{color:var(--text-secondary);margin-bottom:16px;line-height:1.7}.content-card ul,.content-card ol{margin-left:24px;margin-bottom:16px;color:var(--text-secondary)}.content-card li{margin-bottom:8px;line-height:1.6}.calculator-section{margin-bottom:48px}.calculator-form{background:var(--bg-primary);border:1px solid var(--border);border-radius:12px;padding:32px;box-shadow:var(--shadow)}.form-group{margin-bottom:24px}.form-label{display:block;font-weight:600;margin-bottom:8px;color:var(--text-primary);font-size:14px}.form-input{width:100%;padding:12px 16px;border:1px solid var(--border);border-radius:8px;font-size:16px;font-family:inherit;transition:border-color .2s;background:var(--bg-primary);color:var(--text-primary)}.form-input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px #2563eb1a}.calculate-btn{background:var(--primary);color:#fff;padding:12px 32px;border:none;border-radius:8px;font-weight:600;font-size:16px;cursor:pointer;transition:all .2s}.calculate-btn:hover{background:var(--primary-dark);transform:translateY(-2px);box-shadow:var(--shadow-lg)}.result-box{background:var(--bg-tertiary);border:1px solid var(--border);border-radius:8px;padding:24px;margin-top:24px}.result-label{font-size:14px;color:var(--text-secondary);margin-bottom:4px}.result-value{font-size:28px;font-weight:700;color:var(--primary)}@media(max-width:768px){.header-content{flex-direction:column;gap:16px}.main-nav{flex-wrap:wrap;justify-content:center;gap:16px}.hero-section{padding:60px 24px}.tools-grid,.education-grid,.footer-grid{grid-template-columns:1fr}}