/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
 
:root {
    --primary-color: #0066cc;
    --secondary-color: #0052a3;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --light-bg: #f8f9fa;
    --card-bg: #ffffff;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --border-color: #dee2e6;
    --canvas-bg: #f5f5f5;
}
 
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(--light-bg);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}
 
/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}
 
/* Header */
header {
    text-align: center;
    margin-bottom: 30px;
    padding: 20px;
    background: var(--card-bg);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}
 
h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    color: var(--primary-color);
}
 
.subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
}
 
/* Canvas Container */
.canvas-container {
    background: var(--card-bg);
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 30px;
    border: 1px solid var(--border-color);
}
 
#pulseCanvas {
    width: 100%;
    height: 300px;
    border-radius: 4px;
    display: block;
    background: var(--canvas-bg);
}
 
/* Controls */
.controls {
    background: var(--card-bg);
    border-radius: 8px;
    padding: 30px;
    margin-bottom: 30px;
    border: 1px solid var(--border-color);
}
 
.control-group {
    margin-bottom: 30px;
}
 
.control-group:last-of-type {
    margin-bottom: 20px;
}
 
.control-group > label:first-child {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}
 
.control-label {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    display: block;
    margin-bottom: 10px;
}
 
.control-value {
    font-size: 1rem;
    color: var(--primary-color);
    font-weight: bold;
    font-family: 'Courier New', monospace;
}
 
/* Range Sliders */
input[type="range"] {
    width: 100%;
    height: 8px;
    border-radius: 5px;
    background: var(--border-color);
    outline: none;
    -webkit-appearance: none;
    appearance: none;
    cursor: pointer;
}
 
input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    transition: all 0.2s ease;
}
 
input[type="range"]::-webkit-slider-thumb:hover {
    background: var(--secondary-color);
    transform: scale(1.1);
}
 
input[type="range"]::-moz-range-thumb {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    transition: all 0.2s ease;
}
 
input[type="range"]::-moz-range-thumb:hover {
    background: var(--secondary-color);
    transform: scale(1.1);
}
 
.range-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 5px;
}
 
/* Toggle Switch for Pulse Mode */
.toggle-switch {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}
 
.toggle-switch input[type="radio"] {
    display: none;
}
 
.toggle-option {
    flex: 1;
    min-width: 150px;
    padding: 12px 20px;
    text-align: center;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    background: var(--light-bg);
}
 
.toggle-option:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}
 
.toggle-switch input[type="radio"]:checked + .toggle-option {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* Time Input Controls */
.time-input-row {
    display: flex;
    gap: 10px;
    align-items: center;
}
 
.time-input {
    flex: 1;
    padding: 12px 15px;
    font-size: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    background: var(--card-bg);
    color: var(--text-primary);
    font-family: 'Courier New', monospace;
    font-weight: bold;
    transition: border-color 0.2s ease;
}
 
.time-input:focus {
    outline: none;
    border-color: var(--primary-color);
}
 
.time-unit-select {
    padding: 12px 15px;
    font-size: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    background: var(--card-bg);
    color: var(--text-primary);
    cursor: pointer;
    font-weight: 500;
    transition: border-color 0.2s ease;
}
 
.time-unit-select:focus {
    outline: none;
    border-color: var(--primary-color);
}
 
.info-text {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 8px;
    font-style: italic;
}
 
.info-text span {
    color: var(--primary-color);
    font-weight: 600;
}
 
/* Reset Button */
.reset-btn {
    width: 100%;
    padding: 15px;
    font-size: 1rem;
    font-weight: 600;
    color: white;
    background: var(--primary-color);
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
}
 
.reset-btn:hover {
    background: var(--secondary-color);
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}
 
.reset-btn:active {
    transform: translateY(0);
}
 
/* Info Panel */
.info-panel {
    background: var(--card-bg);
    border-radius: 8px;
    padding: 30px;
    margin-bottom: 30px;
    border: 1px solid var(--border-color);
}
 
.info-panel h3 {
    margin-bottom: 20px;
    color: var(--text-primary);
    font-size: 1.3rem;
}
 
.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}
 
.info-item {
    display: flex;
    flex-direction: column;
    padding: 15px;
    background: var(--light-bg);
    border-radius: 6px;
    border-left: 4px solid var(--primary-color);
}
 
.info-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 5px;
}
 
.info-value {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--primary-color);
    font-family: 'Courier New', monospace;
}
 
/* Footer */
footer {
    text-align: center;
    padding: 20px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}
 
/* Offline Indicator */
.offline-indicator {
    display: inline-block;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    margin-right: 8px;
}
 
.offline-indicator.online {
    color: var(--success-color);
    animation: pulse 2s infinite;
}
 
.offline-indicator.offline {
    color: var(--danger-color);
}
 
@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}
 
/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
 
    h1 {
        font-size: 2rem;
    }
 
    .subtitle {
        font-size: 0.9rem;
    }
 
    header {
        padding: 15px;
        margin-bottom: 20px;
    }
 
    .canvas-container {
        padding: 15px;
        margin-bottom: 20px;
    }
 
    #pulseCanvas {
        height: 250px;
    }
 
    .controls {
        padding: 20px;
        margin-bottom: 20px;
    }
 
    .control-group {
        margin-bottom: 25px;
    }
 
    .control-label {
        font-size: 0.9rem;
    }
 
    .control-value {
        font-size: 0.9rem;
    }
 
    .toggle-option {
        min-width: 120px;
        padding: 10px 15px;
        font-size: 0.85rem;
    }

    .time-input, .time-unit-select {
        padding: 10px 12px;
        font-size: 0.9rem;
    }
 
    .info-text {
        font-size: 0.8rem;
    }
 
 
    .info-panel {
        padding: 20px;
        margin-bottom: 20px;
    }
 
    .info-panel h3 {
        font-size: 1.1rem;
        margin-bottom: 15px;
    }
 
    .info-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }
 
    .info-item {
        padding: 12px;
    }
 
    .info-value {
        font-size: 1rem;
    }
}
 
@media (max-width: 480px) {
    h1 {
        font-size: 1.5rem;
    }
 
    .subtitle {
        font-size: 0.8rem;
    }
 
    #pulseCanvas {
        height: 200px;
    }
 
    .controls {
        padding: 15px;
    }
 
    .control-group {
        margin-bottom: 20px;
    }
 
    .reset-btn {
        padding: 12px;
        font-size: 0.9rem;
    }
 
    .info-panel {
        padding: 15px;
    }
 
    .toggle-switch {
        flex-direction: column;
    }
 
    .toggle-option {
        min-width: 100%;
    }
}
 
/* Print Styles */
@media print {
    body {
        background: white;
        color: black;
    }
 
    .controls,
    footer {
        display: none;
    }
 
    .canvas-container {
        border: 1px solid #ccc;
    }
}
 
/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}