/**
 * Let's Go Bounce - Tech Demo Styles
 * A motivational, energetic visual design
 */

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

:root {
    /* Color palette - energetic and motivational */
    --color-bg-dark: #0a0a1a;
    --color-bg-card: #12122a;
    --color-bg-elevated: #1a1a3a;

    --color-primary: #00d4ff;
    --color-primary-glow: rgba(0, 212, 255, 0.4);
    --color-secondary: #ff6b9d;
    --color-secondary-glow: rgba(255, 107, 157, 0.4);
    --color-accent: #7c3aed;
    --color-success: #10b981;
    --color-warning: #f59e0b;

    --color-text: #ffffff;
    --color-text-muted: #a0a0c0;
    --color-text-dim: #606080;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    --gradient-energetic: linear-gradient(135deg, #ff6b9d, #ff8a5c, #ffd93d);
    --gradient-bg: radial-gradient(ellipse at top, #1a1a4a 0%, #0a0a1a 100%);

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;

    /* Border radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-glow: 0 0 30px var(--color-primary-glow);
    --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.3);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 400ms ease;
}

html, body {
    height: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: var(--gradient-bg);
    background-attachment: fixed;
    color: var(--color-text);
    line-height: 1.5;
    overflow-x: hidden;
}

/* ===== App Container ===== */
.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ===== Header ===== */
.header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md) var(--space-lg);
    background: rgba(10, 10, 26, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.back-link {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--color-text-muted);
    text-decoration: none;
    font-size: 0.875rem;
    transition: color var(--transition-fast);
}

.back-link:hover {
    color: var(--color-primary);
}

.title {
    font-size: 1.25rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.badge {
    margin-left: auto;
    padding: var(--space-xs) var(--space-sm);
    background: var(--color-accent);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ===== Main Content ===== */
.main-content {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--space-lg);
}

/* ===== Screens ===== */
.screen {
    display: none;
    width: 100%;
    max-width: 1200px;
    animation: fadeIn var(--transition-normal);
}

.screen.active {
    display: block;
}

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

/* ===== Setup Screen ===== */
.setup-card {
    max-width: 500px;
    margin: 0 auto;
    padding: var(--space-2xl);
    background: var(--color-bg-card);
    border-radius: var(--radius-xl);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: var(--shadow-card);
    text-align: center;
}

.setup-card h2 {
    font-size: 1.75rem;
    margin-bottom: var(--space-md);
    background: var(--gradient-energetic);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.intro-text {
    color: var(--color-text-muted);
    margin-bottom: var(--space-xl);
}

.setup-steps {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
    text-align: left;
}

.step {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    background: var(--color-bg-elevated);
    border-radius: var(--radius-md);
}

.step-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    font-weight: 700;
    font-size: 0.875rem;
    flex-shrink: 0;
}

.step-text {
    font-size: 0.9375rem;
    color: var(--color-text-muted);
}

/* BPM Selector */
.bpm-selector {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
    padding: var(--space-md);
    background: var(--color-bg-elevated);
    border-radius: var(--radius-md);
}

.bpm-selector label {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.bpm-selector input[type="range"] {
    width: 150px;
    accent-color: var(--color-primary);
}

#bpm-display {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary);
    min-width: 40px;
}

/* Buttons */
.primary-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-xl);
    background: var(--gradient-primary);
    border: none;
    border-radius: var(--radius-full);
    color: white;
    font-size: 1.125rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    box-shadow: var(--shadow-glow);
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 40px var(--color-primary-glow);
}

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

.secondary-btn {
    padding: var(--space-md) var(--space-xl);
    background: transparent;
    border: 2px solid var(--color-text-muted);
    border-radius: var(--radius-full);
    color: var(--color-text-muted);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.secondary-btn:hover {
    border-color: var(--color-text);
    color: var(--color-text);
}

.camera-note {
    margin-top: var(--space-xl);
    font-size: 0.75rem;
    color: var(--color-text-dim);
}

/* ===== Bounce Screen ===== */
.bounce-layout {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: var(--space-xl);
    width: 100%;
}

@media (max-width: 900px) {
    .bounce-layout {
        grid-template-columns: 1fr;
    }
}

/* Detection Area */
.detection-area {
    position: relative;
    aspect-ratio: 4 / 3;
    max-height: 70vh;
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 2px solid rgba(255, 255, 255, 0.1);
}

#webcam {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transform: scaleX(-1);
}

#detection-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    transform: scaleX(-1);
}

.bounce-indicator {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    opacity: 0;
    transition: opacity var(--transition-fast);
    pointer-events: none;
}

.bounce-indicator.active {
    opacity: 1;
}

.indicator-ring {
    width: 120px;
    height: 120px;
    border: 4px solid var(--color-primary);
    border-radius: 50%;
    animation: pulse 0.5s ease-out;
    box-shadow: var(--shadow-glow);
}

@keyframes pulse {
    0% { transform: scale(0.8); opacity: 1; }
    100% { transform: scale(1.2); opacity: 0; }
}

.indicator-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    text-shadow: 0 0 20px var(--color-primary-glow);
}

/* Stats Panel */
.stats-panel {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
    padding: var(--space-lg);
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.stat-group h3 {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-dim);
    margin-bottom: var(--space-sm);
}

.stat {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-sm) 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.stat:last-child {
    border-bottom: none;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.stat-value {
    font-size: 1.25rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
}

.state-indicator {
    font-size: 0.875rem;
    padding: var(--space-xs) var(--space-sm);
    background: var(--color-bg-elevated);
    border-radius: var(--radius-sm);
}

.state-indicator.bouncing {
    background: var(--color-success);
    color: white;
}

/* Motion Bar */
.motion-bar {
    width: 100%;
    height: 8px;
    background: var(--color-bg-elevated);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.motion-fill {
    height: 100%;
    width: 0%;
    background: var(--gradient-primary);
    transition: width var(--transition-fast);
}

/* Beat Visualizer */
.beat-visualizer {
    position: relative;
    height: 40px;
    background: var(--color-bg-elevated);
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-bottom: var(--space-sm);
}

.beat-track {
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 2px;
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-50%);
}

.beat-dot {
    position: absolute;
    top: 50%;
    left: 10%;
    width: 16px;
    height: 16px;
    background: var(--color-primary);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    box-shadow: 0 0 15px var(--color-primary-glow);
    transition: left 0.1s linear;
}

.beat-dot.on-beat {
    background: var(--color-success);
    box-shadow: 0 0 20px rgba(16, 185, 129, 0.6);
}

/* Controls */
.controls {
    display: flex;
    gap: var(--space-md);
    margin-top: auto;
    padding-top: var(--space-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.control-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background: var(--color-bg-elevated);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    color: var(--color-text);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.control-btn:hover {
    background: var(--color-bg-card);
    border-color: var(--color-primary);
}

.control-btn.stop {
    flex: 1;
    background: rgba(239, 68, 68, 0.2);
    border-color: rgba(239, 68, 68, 0.3);
    color: #ef4444;
}

.control-btn.stop:hover {
    background: rgba(239, 68, 68, 0.3);
    border-color: #ef4444;
}

.control-btn.muted svg {
    opacity: 0.4;
}

/* ===== Summary Screen ===== */
.summary-card {
    max-width: 500px;
    margin: 0 auto;
    padding: var(--space-2xl);
    background: var(--color-bg-card);
    border-radius: var(--radius-xl);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: var(--shadow-card);
    text-align: center;
}

.summary-header h2 {
    font-size: 2rem;
    margin-bottom: var(--space-sm);
    background: var(--gradient-energetic);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.summary-motivational {
    font-size: 1.125rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-xl);
}

.summary-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
}

.summary-stat {
    padding: var(--space-lg);
    background: var(--color-bg-elevated);
    border-radius: var(--radius-md);
}

.summary-value {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--space-xs);
}

.summary-label {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.summary-actions {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

/* ===== Utility Classes ===== */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}