:root{--primary-color: #3b82f6;--primary-hover: #2563eb;--success-bg: #e8f5e9;--success-border: #66bb6a;--success-text: #2e7d32;--error-bg: #ffebee;--error-border: #ef5350;--error-text: #c62828;--warning-bg: #fff3e0;--warning-border: #ffa726;--warning-text: #ef6c00;--text-primary: #1f2937;--text-secondary: #4b5563;--background: #ffffff;--border-color: #e5e7eb}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Open Sans,Helvetica Neue,sans-serif;line-height:1.6;color:var(--text-primary);background:var(--background);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.app-container{max-width:800px;margin:0 auto;padding:2rem 1rem}.checker-container{background:white;border-radius:1rem;padding:1.5rem;box-shadow:0 4px 6px -1px #0000001a,0 2px 4px -1px #0000000f}.tabs{display:flex;gap:1rem;margin-bottom:2rem;border-bottom:2px solid var(--border-color);padding-bottom:1rem}.tab-button{background:transparent;color:var(--text-secondary);padding:.75rem 1.5rem;border-radius:.5rem;border:2px solid transparent;font-weight:500;transition:all .2s ease}.tab-button:hover{background:rgba(59,130,246,.1);color:var(--primary-color)}.tab-button.active{background:var(--primary-color);color:#fff}.tab-content{margin-top:1rem}.cert-info{margin-top:1.5rem;padding:1.5rem;border-radius:.75rem;background:#f8fafc;border:1px solid var(--border-color)}.cert-info h3{margin-bottom:1rem;color:var(--text-primary);font-size:1.25rem}.info-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:1rem}.info-item{padding:1rem;background:white;border-radius:.5rem;border:1px solid var(--border-color)}.info-item strong{display:block;margin-bottom:.25rem;color:var(--text-secondary)}.status-ok{color:var(--success-text);font-weight:500}.status-error{color:var(--error-text);font-weight:500}h1{font-size:clamp(1.875rem,4vw,2.5rem);font-weight:700;color:var(--text-primary);margin-bottom:1.5rem;text-align:center}p{color:var(--text-secondary);font-size:clamp(1rem,2vw,1.125rem);margin-bottom:2rem;text-align:center}.input-group{display:flex;gap:.5rem;margin-bottom:1.5rem;flex-wrap:wrap;align-items:stretch}.input-group select{padding:.75rem;border:2px solid var(--border-color);border-radius:.5rem;font-size:1rem;background-color:#fff;color:var(--text-primary);cursor:pointer;transition:all .2s ease;min-width:110px}.input-group select:hover{border-color:var(--primary-color)}.input-group select:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 3px #3b82f61a}input[type=text]{flex:1;min-width:200px;padding:.75rem 1rem;border:2px solid var(--border-color);border-radius:.5rem;font-size:1rem;transition:all .2s ease}input[type=text]:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 3px #3b82f61a}button{padding:.75rem 1.5rem;background-color:var(--primary-color);color:#fff;border:none;border-radius:.5rem;font-size:1rem;font-weight:500;cursor:pointer;transition:all .2s ease;white-space:nowrap}button:hover{background-color:var(--primary-hover)}button:active{transform:scale(.98)}.status-message{padding:1.25rem;border-radius:.75rem;margin:1.5rem 0;font-weight:500;box-shadow:0 2px 4px #0000000d;transition:all .3s ease}.status-message.up{background:var(--success-bg);border:1px solid var(--success-border);color:var(--success-text)}.status-message.down{background:var(--error-bg);border:1px solid var(--error-border);color:var(--error-text)}.status-message.error{background:var(--warning-bg);border:1px solid var(--warning-border);color:var(--warning-text)}.timestamp{font-size:.875rem;color:var(--text-secondary);margin-top:.75rem;display:block}.auto-refresh-container{margin:1.5rem 0;display:flex;align-items:center;gap:1rem;flex-wrap:wrap}.auto-refresh-label{display:flex;align-items:center;gap:.5rem;cursor:pointer}.auto-refresh-label input[type=checkbox]{-moz-appearance:none;appearance:none;-webkit-appearance:none;width:1.25rem;height:1.25rem;border:2px solid var(--border-color);border-radius:.375rem;margin:0;cursor:pointer;transition:all .2s ease;position:relative}.auto-refresh-label input[type=checkbox]:checked{background-color:var(--primary-color);border-color:var(--primary-color)}.auto-refresh-label input[type=checkbox]:checked:after{content:"✓";color:#fff;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);font-size:.875rem}.countdown{font-size:.875rem;color:var(--text-secondary);background:var(--border-color);padding:.25rem .75rem;border-radius:1rem}.recent-checks{margin-top:2rem;padding-top:2rem;border-top:2px solid var(--border-color)}.recent-checks h2{font-size:1.5rem;margin-bottom:1rem;color:var(--text-primary)}@media (max-width: 640px){.checker-container{padding:1rem}.input-group{flex-direction:column;gap:.75rem}.input-group select,button,input[type=text]{width:100%}.auto-refresh-container{flex-direction:column;align-items:flex-start;gap:.75rem}.tabs{flex-direction:column;gap:.5rem}.tab-button{width:100%;text-align:center}.info-grid{grid-template-columns:1fr}}