*{box-sizing:border-box;padding:0;margin:0}:root{--primary:#2563eb;--primary-dark:#1d4ed8;--success:#10b981;--success-dark:#059669;--background:#f8fafc;--card-bg:#fff;--text-primary:#1e293b;--text-secondary:#64748b;--border:#e2e8f0;--gold:#f59e0b;--gold-light:#fef3c7}body,html{max-width:100vw;overflow-x:hidden;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;background:var(--background);color:var(--text-primary)}a{color:inherit;text-decoration:none}.container{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:2rem}.card{background:var(--card-bg);border-radius:16px;box-shadow:0 4px 6px -1px rgba(0,0,0,.1),0 2px 4px -2px rgba(0,0,0,.1);padding:2rem;width:100%;max-width:450px}.card-lg{max-width:600px}.title{font-size:1.75rem;font-weight:700;margin-bottom:.5rem;color:var(--text-primary)}.subtitle,.title{text-align:center}.subtitle{font-size:1rem;color:var(--text-secondary);margin-bottom:2rem}.form-group{margin-bottom:1.5rem}.label{display:block;font-size:.875rem;font-weight:600;color:var(--text-primary);margin-bottom:.5rem}.input{width:100%;padding:.875rem 1rem;border:2px solid var(--border);border-radius:10px;font-size:1rem;transition:border-color .2s,box-shadow .2s;outline:none}.input:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(37,99,235,.1)}.btn{width:100%;padding:1rem;border:none;border-radius:10px;font-size:1rem;font-weight:600;cursor:pointer;transition:all .2s;display:flex;align-items:center;justify-content:center;gap:.5rem}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover:not(:disabled){background:var(--primary-dark);transform:translateY(-1px)}.btn-success{background:var(--success);color:#fff}.btn-success:hover:not(:disabled){background:var(--success-dark)}.btn:disabled{opacity:.6;cursor:not-allowed}.error-message{background:#fef2f2;border:1px solid #fecaca;color:#dc2626;border-radius:8px}.error-message,.success-message{padding:.75rem 1rem;font-size:.875rem;margin-bottom:1rem}.success-message{background:#f0fdf4;border:1px solid #bbf7d0;color:#16a34a;border-radius:8px}.certificate-container{min-height:100vh;background:linear-gradient(135deg,#667eea,#764ba2);padding:2rem;display:flex;flex-direction:column;align-items:center;justify-content:center}.certificate-card{background:#fff;border-radius:20px;box-shadow:0 25px 50px -12px rgba(0,0,0,.25);padding:3rem;width:100%;max-width:650px;position:relative;overflow:hidden}.certificate-card:before{content:"";position:absolute;top:0;left:0;right:0;height:8px;background:linear-gradient(90deg,var(--gold),#fbbf24,var(--gold))}.valid-badge{display:inline-flex;align-items:center;gap:.5rem;background:linear-gradient(135deg,#10b981,#059669);color:#fff;padding:.75rem 1.5rem;border-radius:50px;font-weight:600;font-size:1rem;margin-bottom:2rem;box-shadow:0 4px 14px rgba(16,185,129,.4)}.valid-icon{width:24px;height:24px;background:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;color:var(--success);font-weight:700}.certificate-title{font-size:1.5rem;font-weight:700;color:var(--text-primary);margin-bottom:.5rem;text-align:center}.certificate-name{font-size:2.5rem;font-weight:800;background:linear-gradient(135deg,#667eea,#764ba2);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;text-align:center;margin-bottom:2rem}.certificate-details{background:var(--background);border-radius:12px;padding:1.5rem;margin-bottom:1.5rem}.detail-row{display:flex;justify-content:space-between;align-items:center;padding:.75rem 0;border-bottom:1px solid var(--border)}.detail-row:last-child{border-bottom:none}.detail-label{font-size:.875rem;color:var(--text-secondary);font-weight:500}.detail-value{font-size:1rem;color:var(--text-primary);font-weight:600;text-align:right}.course-badge{display:inline-block;background:var(--gold-light);color:#b45309;padding:.5rem 1rem;border-radius:8px;font-weight:600}.certificate-footer{text-align:center;padding-top:1.5rem;border-top:2px dashed var(--border)}.footer-text{font-size:.875rem;color:var(--text-secondary)}.loading-spinner{width:40px;height:40px;border:4px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(1turn)}}.loading-container{display:flex;flex-direction:column;align-items:center;gap:1rem;padding:3rem}.loading-text{color:#fff;font-size:1.125rem;font-weight:500}.home-container{min-height:100vh;background:linear-gradient(135deg,#1e293b,#334155);display:flex;flex-direction:column;align-items:center;justify-content:center;padding:2rem}.home-card{background:#fff;border-radius:20px;padding:3rem;text-align:center;max-width:500px;width:100%}.home-icon{width:80px;height:80px;background:linear-gradient(135deg,#667eea,#764ba2);border-radius:20px;display:flex;align-items:center;justify-content:center;margin:0 auto 1.5rem;font-size:2.5rem}.home-title{font-size:2rem;font-weight:800;margin-bottom:.5rem}.home-subtitle{color:var(--text-secondary);margin-bottom:2rem}.home-links{display:flex;flex-direction:column;gap:1rem}.home-link{padding:1rem 1.5rem;border-radius:12px;font-weight:600;transition:all .2s;display:flex;align-items:center;justify-content:center;gap:.5rem}.home-link-primary{background:var(--primary);color:#fff}.home-link-primary:hover{background:var(--primary-dark);transform:translateY(-2px)}.home-link-secondary{background:var(--background);color:var(--text-primary);border:2px solid var(--border)}.home-link-secondary:hover{border-color:var(--primary);color:var(--primary)}.not-found-card{background:#fff;border-radius:20px;padding:3rem;text-align:center;max-width:450px}.not-found-icon{font-size:4rem;margin-bottom:1rem}.not-found-title{font-size:1.5rem;font-weight:700;color:var(--text-primary);margin-bottom:.5rem}.not-found-text{color:var(--text-secondary)}