/* ========================================
   MEQANIC Intuition - Quantum Visualization
   Modern Dark Theme Stylesheet
   ======================================== */

:root {
    /* Color Palette */
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-tertiary: #1a1a2e;
    --bg-card: #16213e;

    --text-primary: #e8e8e8;
    --text-secondary: #a0a0a0;
    --text-muted: #666680;

    --accent-primary: #00d4ff;
    --accent-secondary: #7b68ee;
    --accent-success: #00e676;
    --accent-warning: #ffd600;
    --accent-danger: #ff4757;

    --quantum-gold: #ffd700;
    --quantum-purple: #9d4edd;
    --quantum-red: #ff6b6b;

    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(0, 212, 255, 0.3);

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    --transition-slow: 0.4s ease;

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-full: 50%;
}

/* Reset & Base Styles */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    height: 100vh;
    height: 100dvh;
}

/* ========================================
   Operate Button (Gate Beam Toggle)
   ======================================== */

.operate-btn {
    background: linear-gradient(135deg, #ffaa00 0%, #ff8800 100%);
    border: none;
}

.operate-btn:hover:not(:disabled) {
    background: linear-gradient(135deg, #ffcc00 0%, #ffaa00 100%);
    box-shadow: var(--shadow-md), 0 0 20px rgba(255, 170, 0, 0.4);
}

.operate-btn.active {
    background: linear-gradient(135deg, #ffdd44 0%, #ffaa00 100%);
    box-shadow: 0 0 15px rgba(255, 220, 100, 0.6);
}

/* ========================================
   Decohere Button (Decoherence Beam Toggle)
   ======================================== */

.decohere-btn {
    background: linear-gradient(135deg, #cc4444 0%, #aa2222 100%);
    border: none;
}

.decohere-btn:hover:not(:disabled) {
    background: linear-gradient(135deg, #dd5555 0%, #cc4444 100%);
    box-shadow: var(--shadow-md), 0 0 20px rgba(200, 60, 60, 0.4);
}

.decohere-btn.active {
    background: linear-gradient(135deg, #ff6666 0%, #cc4444 100%);
    box-shadow: 0 0 15px rgba(255, 100, 100, 0.6);
}

/* ========================================
   About Button
   ======================================== */

.about-btn {
    background: linear-gradient(135deg, #6c757d 0%, #495057 100%);
    border: none;
}

.about-btn:hover:not(:disabled) {
    background: linear-gradient(135deg, #7c858d 0%, #5a6268 100%);
    box-shadow: var(--shadow-md), 0 0 20px rgba(108, 117, 125, 0.4);
}

/* ========================================
   Main Canvas Container
   ======================================== */

.canvas-container {
    flex: 1;
    position: relative;
    overflow: hidden;
    background: radial-gradient(ellipse at center, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

#quantum-canvas {
    display: block;
    width: 100%;
    height: 100%;
    cursor: grab;
    touch-action: none;
}

#quantum-canvas:active {
    cursor: grabbing;
}

#quantum-canvas.measuring {
    cursor: crosshair;
}

#quantum-canvas.dragging {
    cursor: grabbing;
}

/* Instructions Overlay */
.instructions {
    position: absolute;
    bottom: var(--spacing-lg);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.8rem;
    color: var(--text-secondary);
    opacity: 0.8;
    transition: opacity var(--transition-normal);
    pointer-events: none;
}

.instructions:hover {
    opacity: 1;
}

.instructions .separator {
    color: var(--text-muted);
}

/* ========================================
   Bottom Control Bar
   ======================================== */

.controls {
    background: linear-gradient(180deg, var(--bg-tertiary) 0%, var(--bg-secondary) 100%);
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    gap: var(--spacing-lg);
    justify-content: center;
    align-items: center;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    flex-shrink: 0;
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.3);
    position: relative;
    z-index: 10;
}

.control-group {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

.mode-group {
    background: rgba(0, 0, 0, 0.3);
    padding: var(--spacing-xs);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

/* Button Styles */
.control-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    min-width: 44px;
    min-height: 44px;
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
    -webkit-tap-highlight-color: transparent;
}

.control-btn:hover:not(:disabled) {
    background: var(--bg-tertiary);
    border-color: var(--accent-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md), var(--shadow-glow);
}

.control-btn:active:not(:disabled) {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.control-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.control-btn .btn-icon {
    font-size: 1.25rem;
    line-height: 1;
}

.control-btn .btn-label {
    display: none;
}

/* Mode Buttons */
.mode-btn {
    background: transparent;
    border: none;
    box-shadow: none;
}

.mode-btn:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.1);
    border: none;
    box-shadow: none;
}

.mode-btn.active {
    background: var(--accent-primary);
    color: var(--bg-primary);
    border: none;
}

.mode-btn.active:hover {
    background: var(--accent-primary);
    transform: none;
    box-shadow: 0 0 15px rgba(0, 212, 255, 0.5);
}

/* Accent Button */
.accent-btn {
    background: linear-gradient(135deg, var(--accent-secondary) 0%, var(--quantum-purple) 100%);
    border: none;
}

.accent-btn:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--quantum-purple) 0%, var(--accent-secondary) 100%);
    box-shadow: var(--shadow-md), 0 0 20px rgba(157, 78, 221, 0.4);
}

/* ========================================
   Responsive Design
   ======================================== */

@media (min-width: 640px) {
    .control-btn .btn-label {
        display: inline;
    }

    .control-btn {
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .state-display {
        padding: var(--spacing-md) var(--spacing-xl);
    }

    .controls {
        padding: var(--spacing-md) var(--spacing-xl);
    }
}

@media (max-width: 480px) {
    .meqanic-link {
        top: auto;
        bottom: 80px;
        left: var(--spacing-sm);
        font-size: 0.75rem;
        padding: var(--spacing-xs) var(--spacing-sm);
        opacity: 0.7;
    }

    .meqanic-link:hover {
        opacity: 1;
    }

    .controls {
        padding: var(--spacing-sm) var(--spacing-md);
        gap: var(--spacing-xs);
    }

    .control-btn {
        min-width: 36px;
        min-height: 36px;
        padding: var(--spacing-xs);
    }

    .control-btn .btn-icon {
        font-size: 1rem;
    }

    .control-btn .btn-label {
        display: none;
    }

    .instructions {
        display: none;
    }
}

/* ========================================
   Animations & Effects
   ======================================== */

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

@keyframes glow {
    0%, 100% { box-shadow: 0 0 5px var(--accent-primary); }
    50% { box-shadow: 0 0 20px var(--accent-primary), 0 0 30px var(--accent-primary); }
}

/* Loading Animation */
.loading {
    animation: pulse 1.5s ease-in-out infinite;
}

/* Focus States for Accessibility */
.control-btn:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

/* Selection Styling */
::selection {
    background: var(--accent-primary);
    color: var(--bg-primary);
}

/* ========================================
   Dark Canvas Background Pattern
   ======================================== */

.canvas-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        radial-gradient(circle at 20% 80%, rgba(0, 212, 255, 0.03) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(157, 78, 221, 0.03) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

#quantum-canvas {
    position: relative;
    z-index: 1;
}