/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Fonts */
    --font-display: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

    /* Color Palette */
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --accent-color: #f59e0b;
    --success-color: #10b981;
    --danger-color: #ef4444;
    
    /* Background Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #e2e8f0;
    --bg-dark: #1e293b;
    --bg-darker: #0f172a;
    
    /* Text Colors */
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --text-inverse: #ffffff;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
}

/* Dark Mode Override */
[data-theme="dark"] {
    --primary-color: #3b82f6;
    --primary-hover: #60a5fa;
    --secondary-color: #94a3b8;
    --accent-color: #fbbf24;
    --success-color: #34d399;
    --danger-color: #f87171;
    
    --bg-primary: #151d30;
    --bg-secondary: #090d16;
    --bg-tertiary: #1e293b;
    --bg-dark: #1e293b;
    --bg-darker: #020617;
    
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #64748b;
    --text-inverse: #090d16;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -4px rgba(0, 0, 0, 0.5);
    
    --border-color: rgba(255, 255, 255, 0.08);
    --btn-bg: #1e293b;
    --btn-hover-bg: #334155;
    --tab-active-bg: rgba(59, 130, 246, 0.15);
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Header Styles */
.header {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: var(--text-inverse);
    padding: var(--spacing-xl) 0;
    text-align: center;
    box-shadow: var(--shadow-md);
}

.title {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(45deg, var(--text-primary), var(--text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 1.125rem;
    font-weight: 400;
    opacity: 0.9;
}

/* Main Layout */
.main {
    display: grid;
    grid-template-columns: 1fr 350px;
    gap: var(--spacing-xl);
    padding: var(--spacing-xl);
    max-width: 1400px;
    margin: 0 auto;
}

/* Scene Container */
.scene-container {
    position: relative;
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    height: 600px; /* Fixed height instead of min-height to prevent viewport dependency */
}

#three-canvas {
    width: 100%;
    height: 100%;
    display: block;
}

/* Loading Overlay */
.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    transition: opacity 0.4s cubic-bezier(0.4, 0, 0.2, 1), visibility 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.loading-overlay.hidden {
    opacity: 0;
    visibility: hidden;
}

.loader {
    text-align: center;
}

.loader-spinner {
    width: 44px;
    height: 44px;
    border: 3px solid var(--border-color, var(--bg-tertiary));
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s cubic-bezier(0.4, 0, 0.2, 1) infinite;
    margin: 0 auto var(--spacing-md);
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loader p {
    color: var(--text-secondary);
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 1.1rem;
    letter-spacing: -0.01em;
}

/* Scene Controls */
.scene-controls {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    display: flex;
    gap: var(--spacing-xs);
    z-index: 5;
}

.control-btn {
    width: 40px;
    height: 40px;
    border: none;
    border-radius: var(--radius-md);
    background-color: rgba(255, 255, 255, 0.9);
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-sm);
}

.control-btn:hover {
    background-color: rgba(255, 255, 255, 1);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.control-btn:active {
    transform: translateY(0);
}

/* Controls Panel */
.controls-panel {
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-xl);
    height: fit-content;
    position: sticky;
    top: var(--spacing-xl);
}

.panel-header {
    margin-bottom: var(--spacing-xl);
    text-align: center;
    border-bottom: 2px solid var(--bg-tertiary);
    padding-bottom: var(--spacing-md);
}

.panel-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* Hand Sections */
.hand-section {
    margin-bottom: var(--spacing-2xl);
    padding: var(--spacing-lg);
    background-color: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: 1px solid var(--bg-tertiary);
}

.hand-section h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--primary-color);
    text-align: center;
}

.hand-controls {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.finger-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.finger-group label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

/* Range Slider Styles */
input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--bg-tertiary);
    outline: none;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: all 0.2s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
    background: var(--primary-hover);
    transform: scale(1.1);
}

input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    border: none;
    box-shadow: var(--shadow-sm);
}

/* Hand Value Display */
.hand-value {
    margin-top: var(--spacing-md);
    text-align: center;
    padding: var(--spacing-sm);
    background-color: var(--bg-primary);
    border-radius: var(--radius-sm);
    border: 1px solid var(--bg-tertiary);
}

.hand-value span {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--accent-color);
}

.hand-status {
    margin-top: var(--spacing-xs);
    font-size: 0.8rem;
    font-weight: 500;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    display: inline-block;
    transition: all 0.3s ease;
}

.hand-status.valid {
    background-color: var(--success-color);
    color: var(--text-inverse);
}

.hand-status.invalid {
    background-color: var(--danger-color);
    color: var(--text-inverse);
}

.hand-status.ready {
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
}

.hand-status.animating {
    background-color: var(--primary-color);
    color: var(--text-inverse);
    animation: pulse 1s infinite;
}

/* Total Display */
.total-display {
    text-align: center;
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, var(--success-color), #059669);
    color: var(--text-inverse);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    position: relative;
}

.total-display h3 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.total-breakdown {
    margin-top: var(--spacing-sm);
    font-size: 1rem;
    font-weight: 500;
    opacity: 0.9;
}

.breakdown-text {
    font-family: 'Courier New', monospace;
    background-color: rgba(255, 255, 255, 0.1);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    display: inline-block;
}

.validation-status {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    background-color: rgba(255, 255, 255, 0.2);
    transition: all 0.3s ease;
}

.validation-status.valid {
    background-color: rgba(16, 185, 129, 0.3);
}

.validation-status.invalid {
    background-color: rgba(239, 68, 68, 0.3);
}

/* Preset Section */
.preset-section {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    background-color: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: 1px solid var(--bg-tertiary);
}

.preset-section h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.right-hand-buttons {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-sm);
}

.left-hand-buttons {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-sm);
}

.number-btn {
    padding: var(--spacing-sm);
    border: 2px solid var(--bg-tertiary);
    border-radius: var(--radius-sm);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s ease;
    min-height: 36px;
}

.number-btn:hover {
    background-color: var(--primary-color);
    color: var(--text-inverse);
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.number-btn:active,
.number-btn.active {
    background-color: var(--accent-color);
    color: var(--text-inverse);
    border-color: var(--accent-color);
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

/* Hand Rotation Controls */
.rotation-controls {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-lg);
    background-color: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: 2px solid var(--accent-color);
}

.rotation-controls h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--accent-color);
    text-align: center;
}

.rotation-section {
    margin-bottom: var(--spacing-lg);
}

.rotation-section h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    border-bottom: 1px solid var(--bg-tertiary);
    padding-bottom: var(--spacing-xs);
}

.rotation-group {
    margin-bottom: var(--spacing-sm);
}

.rotation-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
    color: var(--text-secondary);
}

.rotation-group input[type="range"] {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--bg-tertiary);
    outline: none;
    -webkit-appearance: none;
}

.rotation-group input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent-color);
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
}

.rotation-group input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent-color);
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
}

/* Calculator Section */
.calculator-section {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, var(--accent-color), #f59e0b);
    border-radius: var(--radius-md);
    color: var(--text-inverse);
}

.calculator-section h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-inverse);
}

.calculator-buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-sm);
}

.calc-btn {
    padding: var(--spacing-md);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-md);
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--text-inverse);
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
    min-height: 44px;
}

.calc-btn:hover {
    background-color: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.calc-btn:active {
    background-color: rgba(255, 255, 255, 0.3);
    transform: translateY(0);
}

/* Control Section */
.control-section {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    background-color: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: 1px solid var(--bg-tertiary);
}

.control-section h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.control-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.control-button {
    padding: var(--spacing-md);
    border: 2px solid var(--secondary-color);
    border-radius: var(--radius-md);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.control-button:hover {
    background-color: var(--secondary-color);
    color: var(--text-inverse);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.control-button:active {
    transform: translateY(0);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .main {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .controls-panel {
        position: relative;
        top: auto;
    }
    
    .title {
        font-size: 2rem;
    }
    
    .scene-container {
        height: 500px;
    }
}

@media (max-width: 768px) {
    .main {
        padding: var(--spacing-md);
    }
    
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .header {
        padding: var(--spacing-lg) 0;
    }
    
    .title {
        font-size: 1.75rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .controls-panel {
        padding: var(--spacing-md);
    }
    
    .scene-container {
        height: 400px;
    }
    
    .right-hand-buttons,
    .left-hand-buttons {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .calculator-buttons {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .scene-controls {
        top: var(--spacing-sm);
        right: var(--spacing-sm);
    }
    
    .control-btn {
        width: 36px;
        height: 36px;
    }
    
    .hand-section {
        padding: var(--spacing-md);
    }
    
    .right-hand-buttons,
    .left-hand-buttons {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .calculator-buttons {
        grid-template-columns: 1fr;
    }
}

/* Animation Classes */
.fade-in {
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.05);
        opacity: 0.8;
    }
}

.scale-in {
    animation: scaleIn 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus Styles */
button:focus-visible,
input:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --bg-primary: #ffffff;
        --bg-secondary: #f0f0f0;
        --text-primary: #000000;
        --text-secondary: #333333;
        --primary-color: #0000ff;
    }
}

/* Attribution */
.attribution-section {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    text-align: center;
}

.attribution {
    color: var(--text-secondary);
    font-size: 0.75rem;
}

.attribution a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.attribution a:hover {
    text-decoration: underline;
}