/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    color: #2c3e50;
}

.container {
    max-width: 600px;
    margin: 0 auto;
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    overflow: hidden;
}

/* Header */
header {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    color: white;
    padding: 30px 20px;
    text-align: center;
}

header h1 {
    font-size: 2em;
    margin-bottom: 10px;
}

.subtitle {
    opacity: 0.95;
    font-size: 0.95em;
}

/* Steps */
.step {
    display: none;
    padding: 30px 20px;
    animation: fadeIn 0.3s ease-in;
}

.step.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.step h2 {
    color: #2c3e50;
    margin-bottom: 20px;
    font-size: 1.5em;
}

/* Form elements */
.input-field {
    width: 100%;
    padding: 15px;
    font-size: 16px;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    margin-bottom: 20px;
    transition: border-color 0.3s;
}

.input-field:focus {
    outline: none;
    border-color: #667eea;
}

select.input-field {
    background: white;
    cursor: pointer;
}

/* Buttons */
.btn {
    width: 100%;
    padding: 15px;
    font-size: 16px;
    font-weight: 600;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(102, 126, 234, 0.4);
}

.btn-primary:disabled {
    background: #ccc;
    cursor: not-allowed;
}

.btn-secondary {
    background: #e0e0e0;
    color: #2c3e50;
}

.btn-secondary:hover {
    background: #d0d0d0;
}

/* Instructions */
.instructions {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 20px;
    border-left: 4px solid #667eea;
}

.instructions p {
    margin-bottom: 10px;
    line-height: 1.6;
}

.instructions p:last-child {
    margin-bottom: 0;
}

.handedness-toggle {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid #e0e0e0;
}

.handedness-toggle label {
    display: flex;
    align-items: center;
    cursor: pointer;
    font-weight: 500;
    color: #2c3e50;
}

.handedness-toggle input[type="checkbox"] {
    margin-right: 10px;
    width: 20px;
    height: 20px;
    cursor: pointer;
}

/* Calibration area */
#calibrationArea, #calibrationArea3 {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 20px;
}

#cameraContainer, #cameraContainer3 {
    position: relative;
    width: 100%;
    max-width: 400px;
    margin-bottom: 20px;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

#cameraVideo {
    width: 100%;
    height: auto;
    display: block;
    background: #000;
}

#calibrationCanvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    cursor: grab;
}

#calibrationCanvas:active {
    cursor: grabbing;
}

#pastaCanvas {
    display: block;
    width: 100%;
    max-width: 400px;
    height: auto;
    border-radius: 10px;
    cursor: grab;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

#pastaCanvas:active {
    cursor: grabbing;
}

.camera-status {
    font-weight: 600;
    padding: 10px;
    border-radius: 5px;
    background: #f0f0f0;
}

.controls {
    width: 100%;
}

.reference-steps {
    background: #fff3cd;
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 15px;
    border-left: 4px solid #ffc107;
}

.step-instruction {
    margin: 8px 0;
    font-size: 0.95em;
    line-height: 1.5;
    color: #856404;
}

.step-instruction:last-child {
    margin-bottom: 0;
}

.measurement-display {
    background: #e8f5e9;
    padding: 15px;
    border-radius: 8px;
    border-left: 4px solid #4caf50;
}

.measurement-display p {
    margin: 8px 0;
    font-size: 1em;
    color: #2e7d32;
}

.measurement-display p:last-child {
    margin-bottom: 0;
}

.bowl-size-control {
    background: #e3f2fd;
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 15px;
    border-left: 4px solid #2196f3;
}

.bowl-size-control label {
    display: block;
    margin-bottom: 10px;
    font-weight: 600;
    color: #1565c0;
}

.slider {
    width: 100%;
    height: 8px;
    border-radius: 5px;
    background: #e0e0e0;
    outline: none;
    margin-bottom: 15px;
    -webkit-appearance: none;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 25px;
    height: 25px;
    border-radius: 50%;
    background: linear-gradient(135deg, #2196f3 0%, #1976d2 100%);
    cursor: pointer;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

.slider::-moz-range-thumb {
    width: 25px;
    height: 25px;
    border-radius: 50%;
    background: linear-gradient(135deg, #2196f3 0%, #1976d2 100%);
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

.btn-preset-bowl {
    padding: 10px;
    border: 2px solid #2196f3;
    background: white;
    color: #2196f3;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.9em;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-preset-bowl:hover {
    background: #2196f3;
    color: white;
    transform: translateY(-2px);
}

.preset-buttons {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

.controls label {
    display: block;
    margin-bottom: 10px;
    font-weight: 600;
    color: #2c3e50;
}

#bowlSizeDisplay {
    color: #667eea;
    font-size: 1.2em;
}

input[type="range"] {
    width: 100%;
    height: 8px;
    border-radius: 5px;
    background: #e0e0e0;
    outline: none;
    margin-bottom: 20px;
    -webkit-appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 25px;
    height: 25px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    cursor: pointer;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

input[type="range"]::-moz-range-thumb {
    width: 25px;
    height: 25px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

/* Preset buttons */
.preset-buttons {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    margin-bottom: 20px;
}

.btn-preset {
    padding: 12px;
    border: 2px solid #667eea;
    background: white;
    color: #667eea;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-preset:hover {
    background: #667eea;
    color: white;
    transform: translateY(-2px);
}

/* Amount input */
.amount-input {
    margin-bottom: 20px;
}

.amount-input label {
    display: block;
    margin-bottom: 10px;
    font-weight: 600;
}

.input-group {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 10px;
}

.helper-text {
    margin-top: 10px;
    font-size: 0.9em;
    color: #666;
    font-style: italic;
}

/* Estimate display */
.estimate-display {
    margin-bottom: 30px;
}

.estimate-info {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 20px;
}

.estimate-info p {
    margin-bottom: 12px;
    line-height: 1.6;
    font-size: 1.05em;
}

.estimate-info p:last-child {
    margin-bottom: 0;
}

.estimate-info strong {
    color: #2c3e50;
}

.expansion-note {
    color: #667eea;
    font-weight: 600;
    margin-top: 10px;
    padding-top: 10px;
    border-top: 2px solid #e0e0e0;
}

/* Visualization */
.visualization {
    text-align: center;
}

.visualization h3 {
    margin-bottom: 20px;
    color: #2c3e50;
}

#resultCanvas {
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    margin-bottom: 20px;
    max-width: 100%;
    height: auto;
}

/* Fill indicator */
.fill-indicator {
    margin-top: 20px;
}

.fill-indicator p {
    margin-bottom: 10px;
    font-size: 1.1em;
}

.fill-bar {
    width: 100%;
    height: 30px;
    background: #e0e0e0;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: inset 0 2px 5px rgba(0, 0, 0, 0.1);
}

.fill-bar-inner {
    height: 100%;
    background: linear-gradient(90deg, #52c234 0%, #f4d03f 50%, #e74c3c 100%);
    transition: width 0.5s ease;
    border-radius: 15px;
}

/* Mobile responsiveness */
@media (max-width: 480px) {
    body {
        padding: 10px;
    }

    header h1 {
        font-size: 1.5em;
    }

    .step {
        padding: 20px 15px;
    }

    .step h2 {
        font-size: 1.3em;
    }

    .preset-buttons {
        grid-template-columns: repeat(2, 1fr);
    }

    .btn-preset {
        font-size: 0.9em;
        padding: 10px;
    }
}

/* Landscape orientation hint */
@media (max-height: 600px) and (orientation: landscape) {
    .instructions {
        padding: 15px;
        font-size: 0.9em;
    }

    #calibrationCanvas,
    #resultCanvas {
        max-height: 300px;
    }
}