:root {
    --color-bg: #0f172a;
    --color-bg-gradient: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    --color-card-bg: rgba(15, 23, 42, 0.9);
    --color-border: rgba(59, 130, 246, 0.3);
    --color-text: #ffffff;
    --color-text-secondary: #94a3b8;
    --color-highlight: #10b981;
    --color-error: #ef4444;
    --color-warning: #f59e0b;
    --color-success: #10b981;
    --shadow-glow: 0 0 20px rgba(16, 185, 129, 0.3);
    --transition-default: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --blur-effect: blur(10px);
    --border-radius: 8px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

html, body {
    height: 100%;
    overflow: hidden;
    touch-action: manipulation;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--color-bg-gradient);
    color: var(--color-text);
    overscroll-behavior: none;
}

#header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 20;
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: var(--blur-effect);
    border-bottom: 1px solid var(--color-border);
    padding: 1rem;
    text-align: center;
}

#header h1 {
    color: #ffffff;
    font-size: clamp(1rem, 4vw, 1.5rem);
    font-weight: 700;
    margin: 0;
    letter-spacing: 0.5px;
}

#canvas-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

#metrics-hud {
    position: fixed;
    top: 4rem;
    left: 0.5rem;
    right: 0.5rem;
    z-index: 15;
    display: grid;
    gap: 0.75rem;
    grid-template-columns: repeat(auto-fit, minmax(min(160px, 100%), 1fr));
    max-width: 600px;
    margin: 0 auto;
    width: calc(100% - 1rem);
}

.metric-card {
    background: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: 0.75rem;
    backdrop-filter: var(--blur-effect);
    transition: var(--transition-default);
    text-align: center;
}

.metric-label {
    font-size: clamp(0.625rem, 2vw, 0.75rem);
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.25rem;
}

.metric-value {
    font-size: clamp(1.25rem, 5vw, 1.75rem);
    font-weight: 700;
    line-height: 1;
    margin-bottom: 0.25rem;
}

.metric-trend {
    font-size: clamp(0.625rem, 1.5vw, 0.75rem);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.25rem;
}

.trend-up {
    color: var(--color-success);
}

.trend-down {
    color: var(--color-error);
}

#ui-container {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 10;
    padding: clamp(1rem, 4vw, 1.5rem);
    background: linear-gradient(transparent, var(--color-card-bg));
}

#status-bar {
    text-align: center;
    margin-bottom: 1rem;
    padding: 0.75rem 1rem;
    background: var(--color-card-bg);
    border-radius: 2rem;
    backdrop-filter: var(--blur-effect);
    display: inline-block;
    min-width: 80%;
    font-size: clamp(0.75rem, 3vw, 0.875rem);
    font-weight: 600;
}

.status-manual {
    color: var(--color-error);
}

.status-semi {
    color: var(--color-warning);
}

.status-auto {
    color: var(--color-success);
}

#controls {
    display: flex;
    gap: clamp(0.5rem, 2vw, 1rem);
    justify-content: center;
    max-width: 800px;
    margin: 0 auto;
    flex-wrap: wrap;
}

.control-btn {
    flex: 1 1 100px;
    min-height: 3.5rem;
    padding: clamp(0.5rem, 3vw, 0.75rem);
    border: 2px solid transparent;
    background: linear-gradient(145deg, #1e293b, #334155);
    color: #e2e8f0;
    border-radius: 0.75rem;
    cursor: pointer;
    font-size: clamp(0.75rem, 3vw, 0.9rem);
    font-weight: 600;
    transition: var(--transition-default);
    backdrop-filter: var(--blur-effect);
    outline: none;
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-width: 100px;
}

.control-btn.active {
    background: linear-gradient(145deg, var(--color-success), #059669);
    border-color: var(--color-success);
    color: #ffffff;
    box-shadow: 0 0.5rem 1.5rem rgba(16, 185, 129, 0.4);
}

.btn-subtitle {
    font-size: 0.7em;
    opacity: 0.8;
}

#fallback {
    display: none;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    padding: 2rem;
    background: rgba(42, 52, 65, 0.9);
    border-radius: 1rem;
    backdrop-filter: var(--blur-effect);
    max-width: 90%;
    z-index: 20;
}

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

.pulsing {
    animation: pulse 2s ease-in-out infinite;
}

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

@media (max-width: 768px) {
    #metrics-hud {
        grid-template-columns: repeat(2, 1fr);
        top: 3.5rem;
    }
}

@media (max-width: 480px) {
    #controls {
        flex-direction: column;
        gap: 0.75rem;
    }
    .control-btn {
        min-width: 100%;
    }
    #metrics-hud {
        grid-template-columns: 1fr;
        top: 3rem;
    }
}