* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-dark: #0f1115;
    --bg-panel: #1b1e24;
    --bg-track: #23272e;
    
    --accent-red: #ff3366;
    --accent-amber: #ffaa00;
    --accent-cyan: #00eeff;
    --accent-green: #00ff66;
    
    --text-main: #e0e6ed;
    --text-dim: #798394;
    
    --border-color: rgba(255, 255, 255, 0.08);
    --glass-bg: rgba(28, 32, 38, 0.6);
    --glass-border: rgba(255, 255, 255, 0.05);
    
    --step-bg: #14161a;
    --step-border: #0a0b0e;
    
    --font-ui: 'Inter', sans-serif;
    --font-display: 'Orbitron', sans-serif;
}

.visually-hidden {
    position: absolute; width: 1px; height: 1px;
    padding: 0; margin: -1px; overflow: hidden;
    clip: rect(0, 0, 0, 0); border: 0;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: var(--font-ui);
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
    padding: 1rem;
    overflow-x: hidden;
    background-image: 
        radial-gradient(circle at 15% 50%, rgba(255, 51, 102, 0.05), transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(0, 238, 255, 0.05), transparent 25%);
}

/* Accessibility Focus States */
*:focus-visible {
    outline: 3px solid var(--accent-cyan);
    outline-offset: 2px;
}

/* Hardware Container */
.machine-container {
    width: 100%;
    max-width: 1200px;
    background: var(--bg-panel);
    border-radius: 12px;
    padding: 1rem;
    box-shadow: 
        0 25px 50px -12px rgba(0, 0, 0, 0.7),
        inset 0 1px 0 rgba(255, 255, 255, 0.1),
        inset 0 0 20px rgba(0,0,0,0.5);
    border: 1px solid #333;
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* Error Banner */
.error-banner {
    background: rgba(255, 51, 102, 0.2);
    border: 1px solid var(--accent-red);
    color: #fff;
    padding: 1rem;
    border-radius: 8px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.error-banner.hidden {
    display: none;
}
#close-error {
    background: transparent; border: none; color: white;
    font-size: 1.5rem; width: 44px; height: 44px; cursor: pointer;
}

/* Header */
.machine-header {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--border-color);
}

.logo h1 {
    font-family: var(--font-display);
    font-size: 2rem;
    letter-spacing: 2px;
    text-shadow: 0 0 15px rgba(255, 255, 255, 0.2);
}

.logo .highlight { color: var(--accent-red); text-shadow: 0 0 20px var(--accent-red); }
.logo p { font-family: var(--font-display); font-size: 0.75rem; color: var(--text-dim); letter-spacing: 2px; }

fieldset { border: none; }

.master-fx {
    display: flex;
    gap: 1rem;
    background: var(--glass-bg);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    border: 1px solid var(--glass-border);
    flex-wrap: wrap;
}

.control-group, .control-box {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.control-group label, .control-box label {
    font-size: 0.7rem;
    text-transform: uppercase;
    color: var(--text-dim);
    font-weight: 600;
    letter-spacing: 1px;
}

/* Transport */
.transport-section {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: space-between;
    align-items: center;
    background: var(--glass-bg);
    padding: 1rem;
    border-radius: 8px;
    border: 1px solid var(--glass-border);
}

.transport-controls, .timing-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.transport-controls { justify-content: center; }

/* Buttons */
.btn {
    font-family: var(--font-display);
    padding: 0 1rem;
    min-height: 44px;
    min-width: 44px; /* Accessible standard */
    border: none;
    border-radius: 4px;
    font-weight: 700;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s ease;
    text-transform: uppercase;
    background: #333942;
    color: #fff;
    box-shadow: 0 4px 6px rgba(0,0,0,0.3), inset 0 1px 0 rgba(255,255,255,0.1);
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn:active:not(:disabled) {
    transform: translateY(2px);
    box-shadow: 0 1px 2px rgba(0,0,0,0.5);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

#btn-play { background: var(--accent-green); color: #000; box-shadow: 0 0 15px rgba(0, 255, 102, 0.4); }
#btn-play.active { background: #fff; box-shadow: 0 0 25px var(--accent-green); }
#btn-stop { background: var(--accent-amber); color: #000; }
.btn.danger { background: var(--bg-dark); color: var(--accent-red); border: 1px solid var(--accent-red); }
.btn.danger:hover:not(:disabled) { background: var(--accent-red); color: #fff; box-shadow: 0 0 15px rgba(255, 51, 102, 0.5); }

.control-box.text-display { align-items: center; }

.display-value {
    font-family: var(--font-display);
    font-size: 1.25rem;
    color: var(--accent-cyan);
    background: #000;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    border: 1px solid #333;
    margin: 0.2rem 0;
    box-shadow: inset 0 0 5px rgba(0, 238, 255, 0.1);
}

/* Tracks */
.tracks-section {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.track {
    display: flex;
    flex-direction: column; /* Mobile first */
    background: var(--bg-track);
    border-radius: 8px;
    padding: 0.75rem;
    border: 1px solid #2c313a;
    gap: 1rem;
}

.track-controls {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 1rem;
}

.track-select-wrap select {
    background: #111;
    color: var(--accent-cyan);
    font-family: var(--font-ui);
    font-size: 0.9rem;
    padding: 0.5rem;
    border: 1px solid #444;
    border-radius: 4px;
    min-height: 44px; /* Accessible standard */
    outline: none;
    cursor: pointer;
    flex-grow: 1;
}

.track-btns {
    display: flex;
    gap: 0.5rem;
}

.track-btn {
    min-width: 44px;
    min-height: 44px;
    border-radius: 4px;
    border: none;
    background: #333;
    color: #888;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.2s;
}

.track-btn.mute.active { background: var(--accent-red); color: #fff; box-shadow: 0 0 10px rgba(255, 51, 102, 0.6); }
.track-btn.solo.active { background: var(--accent-amber); color: #111; box-shadow: 0 0 10px rgba(255, 170, 0, 0.6); }

.track-params {
    display: flex;
    gap: 1rem;
    justify-content: space-around;
    flex-grow: 1;
}

.param-knob {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 60px;
}
.param-knob label {
    font-size: 0.65rem;
    color: var(--text-dim);
    margin-bottom: 0.5rem;
}

/* Custom Range Input */
input[type=range] { -webkit-appearance: none; width: 100%; background: transparent; min-height: 44px; }
input[type=range]::-webkit-slider-thumb {
    -webkit-appearance: none;
    height: 24px;
    width: 16px;
    border-radius: 2px;
    background: #fff;
    cursor: pointer;
    margin-top: -9px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.5);
}
input[type=range]:focus { outline: none; }
input[type=range]::-webkit-slider-runnable-track {
    width: 100%;
    height: 6px;
    cursor: pointer;
    background: #111;
    border-radius: 3px;
    border: 1px solid #333;
}

/* Sequencer Grid Mobile */
.sequencer-grid {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    grid-gap: 0.5rem;
    width: 100%;
}

.step {
    aspect-ratio: 1; /* Make them squares */
    min-height: 44px; /* Accessible minimum */
    background: var(--step-bg);
    border: 2px solid var(--step-border);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.1s;
    box-shadow: inset 0 2px 5px rgba(0,0,0,0.5);
    position: relative;
    padding: 0;
}

.step:hover { background: #1f2228; }
.step.active {
    background: var(--accent-cyan);
    border-color: #fff;
    box-shadow: 0 0 15px rgba(0, 238, 255, 0.4), inset 0 0 10px rgba(255,255,255,0.5);
}
.step.playing { border-color: #fff; }
.step.playing::after {
    content: ''; position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(255,255,255,0.3); border-radius: 4px;
}

/* Responsive Scaling */
@media (min-width: 900px) {
    .track { flex-direction: row; align-items: center; }
    .track-controls {
        border-right: 2px solid var(--border-color);
        border-bottom: none;
        padding-bottom: 0;
        padding-right: 1.5rem;
        flex-wrap: nowrap;
        max-width: 450px;
    }
    .sequencer-grid {
        display: flex;
        flex-grow: 1;
        gap: 0.3rem;
    }
    .step {
        flex: 1;
        aspect-ratio: auto;
        height: 54px;
    }
    .step:nth-child(4n+1) { border-left: 2px solid #555; }
}

/* Loading Overlay */
.loading-overlay {
    position: absolute; top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(15, 17, 21, 0.95); backdrop-filter: blur(5px);
    display: none; flex-direction: column; justify-content: center; align-items: center;
    z-index: 100; border-radius: 12px;
}
.loading-overlay.visible { display: flex; }
.spinner {
    width: 60px; height: 60px;
    border: 5px solid rgba(255,255,255,0.1);
    border-top: 5px solid var(--accent-cyan);
    border-radius: 50%;
    animation: spin 1s linear infinite; margin-bottom: 1rem;
}
@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }