:root{--primary-color: #2563eb;--primary-hover: #1d4ed8;--success-color: #10b981;--error-color: #ef4444;--warning-color: #f59e0b;--bg-color: #f9fafb;--card-bg: #ffffff;--text-color: #111827;--text-secondary: #6b7280;--border-color: #e5e7eb;--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}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background:var(--bg-color);color:var(--text-color);line-height:1.6}.container{max-width:900px;margin:0 auto;padding:2rem 1rem;min-height:100vh;display:flex;flex-direction:column}header{text-align:center;margin-bottom:3rem}header h1{font-size:2.5rem;font-weight:700;margin-bottom:.5rem;color:var(--text-color)}.subtitle{color:var(--text-secondary);font-size:1.1rem}main{flex:1}.form{background:var(--card-bg);padding:2rem;border-radius:.75rem;box-shadow:var(--shadow-lg);margin-bottom:2rem}.form-group{margin-bottom:1.5rem}.form-group label{display:block;margin-bottom:.5rem;font-weight:500;color:var(--text-color)}.form-group input[type=datetime-local]{width:100%;padding:.75rem;border:1px solid var(--border-color);border-radius:.5rem;font-size:1rem;transition:border-color .2s,box-shadow .2s}.form-group input[type=datetime-local]:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 3px #2563eb1a}.form-group small{display:block;margin-top:.25rem;color:var(--text-secondary);font-size:.875rem}.checkbox-group{display:flex;align-items:center}.checkbox-group label{display:flex;align-items:center;cursor:pointer;margin-bottom:0}.checkbox-group input[type=checkbox]{width:1.25rem;height:1.25rem;margin-right:.5rem;cursor:pointer}.btn{padding:.75rem 1.5rem;font-size:1rem;font-weight:500;border:none;border-radius:.5rem;cursor:pointer;transition:all .2s;display:inline-flex;align-items:center;gap:.5rem}.btn-primary{background:var(--primary-color);color:#fff;width:100%;justify-content:center}.btn-primary:hover:not(:disabled){background:var(--primary-hover);transform:translateY(-1px);box-shadow:var(--shadow-lg)}.btn-primary:disabled{opacity:.6;cursor:not-allowed}.loading-spinner{animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.error-container,.result-container{margin-top:2rem}.error{background:#fef2f2;border:1px solid #fecaca;border-left:4px solid var(--error-color);padding:1.5rem;border-radius:.5rem}.error h3{color:var(--error-color);margin-bottom:.5rem}.error-details{margin-top:.5rem;color:var(--text-secondary);font-size:.875rem}.result{background:var(--card-bg);padding:2rem;border-radius:.75rem;box-shadow:var(--shadow-lg)}.result-header{text-align:center;margin-bottom:2rem}.result-header h2{font-size:2rem;font-weight:700}.result-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem;margin-bottom:2rem}.result-card{background:var(--bg-color);padding:1.5rem;border-radius:.5rem;border:1px solid var(--border-color);transition:transform .2s,box-shadow .2s}.result-card:hover{transform:translateY(-2px);box-shadow:var(--shadow)}.result-card.workday{border-left:4px solid var(--success-color)}.result-card.non-workday{border-left:4px solid var(--text-secondary)}.card-label{font-size:.875rem;color:var(--text-secondary);margin-bottom:.5rem;font-weight:500}.card-value{font-size:1.25rem;font-weight:600;color:var(--text-color)}.holiday-info,.warning{padding:1.5rem;border-radius:.5rem;margin-top:1.5rem}.holiday-info{background:#f0fdf4;border:1px solid #bbf7d0;border-left:4px solid var(--success-color)}.warning{background:#fffbeb;border:1px solid #fde68a;border-left:4px solid var(--warning-color)}.holiday-info h3,.warning h3{margin-bottom:.5rem}.debug-info{margin-top:1.5rem;padding:1.5rem;background:var(--bg-color);border-radius:.5rem;border:1px solid var(--border-color)}.debug-info h3{margin-bottom:1rem}.debug-info pre{overflow-x:auto;font-size:.875rem;line-height:1.5;background:var(--card-bg);padding:1rem;border-radius:.5rem;border:1px solid var(--border-color)}footer{text-align:center;margin-top:3rem;padding-top:2rem;border-top:1px solid var(--border-color);color:var(--text-secondary)}footer a{color:var(--primary-color);text-decoration:none}footer a:hover{text-decoration:underline}@media(max-width:640px){.container{padding:1rem}header h1{font-size:2rem}.form{padding:1.5rem}.result-grid{grid-template-columns:1fr}}