@import url('https://fonts.googleapis.com/css2?family=Roboto+Mono:wght@400;700&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;700&display=swap');

:root {
    --color-bg: #0a0f18;
    --color-bg-light: #1c2333;
    --color-primary: #00aaff;
    --color-primary-dim: #0055aa;
    --color-primary-bright: #a1e2ff;
    --color-accent: #ffaa00;
    --color-accent-dim: #aa7700;
    --color-secondary: #00ffcc;
    --color-text: #e0e0e0;
    --color-text-dim: #888888;
    --font-sans: 'Inter', sans-serif;
    --font-mono: 'Roboto Mono', monospace;
}

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

body, html {
    width: 100%;
    height: 100%;
    overflow-x: hidden;
    background: var(--color-bg);
    font-family: var(--font-sans);
    color: var(--color-text);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.terminal {
    width: 100%;
    min-height: 100%;
    padding: 15px 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

/* Header */
.terminal-header {
    text-align: center;
    padding: 2px 0;
}

.terminal-header h1 {
    font-size: 1.4em;
    font-weight: 700;
    color: var(--color-primary-bright);
    letter-spacing: 3px;
    text-transform: uppercase;
}

.terminal-header p {
    font-size: 0.75em;
    color: var(--color-text-dim);
    font-family: var(--font-mono);
}

/* Performance section: master strip + keyboard side by side */
.performance-section {
    display: flex;
    gap: 10px;
    align-items: stretch;
}

/* Master - slim vertical strip */
.master-strip {
    background: var(--color-bg-light);
    border: 1px solid #2a3449;
    padding: 10px 14px;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    min-width: 70px;
}

.master-strip h2 {
    font-size: 0.7em;
    font-weight: 700;
    color: var(--color-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    white-space: nowrap;
}

.master-knob {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    flex: 1;
}

.master-knob label {
    font-size: 0.65em;
    color: var(--color-text-dim);
    text-transform: uppercase;
}

.master-knob input[type="range"] {
    writing-mode: vertical-lr;
    direction: rtl;
    height: 80px;
    width: 3px;
    -webkit-appearance: slider-vertical;
}

.master-knob span {
    font-family: var(--font-mono);
    font-size: 0.7em;
    color: var(--color-primary-bright);
}

.octave-control {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.octave-control label {
    font-size: 0.6em;
    color: var(--color-text-dim);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.octave-control span {
    font-family: var(--font-mono);
    font-size: 1.1em;
    color: var(--color-accent);
    min-width: 20px;
    text-align: center;
}

.octave-btn {
    width: 32px;
    height: 22px;
    padding: 0;
    font-size: 0.9em;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.mode-control {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.mode-control label {
    font-size: 0.6em;
    color: var(--color-text-dim);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.mode-btn {
    width: 42px;
    padding: 4px 2px;
    font-size: 0.6em;
    letter-spacing: 0.5px;
}

/* Keyboard */
#keyboard {
    flex: 1;
    display: flex;
    justify-content: center;
    position: relative;
    height: 140px;
    min-width: 0;
}

.key {
    width: 50px;
    height: 140px;
    background: #fdfdfd;
    border: 1px solid #ccc;
    border-radius: 0 0 6px 6px;
    cursor: pointer;
    transition: background 0.1s ease;
    display: flex;
    justify-content: center;
    align-items: flex-end;
    padding-bottom: 8px;
    font-family: var(--font-mono);
    font-size: 0.8em;
    color: #333;
    font-weight: bold;
}

.key.black {
    position: absolute;
    width: 34px;
    height: 85px;
    background: #333;
    border: 1px solid #000;
    border-radius: 0 0 5px 5px;
    z-index: 2;
    color: #fff;
    font-size: 0.7em;
}

.key.active {
    background: var(--color-primary);
    color: var(--color-bg);
}

.key.black.active {
    background: var(--color-primary-bright);
    color: var(--color-bg);
}

.key[data-key="a"] { left: calc(50% - 175px); }
.key[data-key="s"] { left: calc(50% - 125px); }
.key[data-key="d"] { left: calc(50% - 75px); }
.key[data-key="f"] { left: calc(50% - 25px); }
.key[data-key="g"] { left: calc(50% + 25px); }
.key[data-key="h"] { left: calc(50% + 75px); }
.key[data-key="j"] { left: calc(50% + 125px); }
.key[data-key="k"] { left: calc(50% + 175px); }

.key[data-key="w"] { left: calc(50% - 150px); }
.key[data-key="e"] { left: calc(50% - 100px); }
.key[data-key="t"] { left: calc(50% + 0px); }
.key[data-key="y"] { left: calc(50% + 50px); }
.key[data-key="u"] { left: calc(50% + 100px); }

/* Rack modules grid */
.main-controls {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 10px;
}

.control-panel {
    background: var(--color-bg-light);
    border: 1px solid #2a3449;
    padding: 10px 12px;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    transition: border-color 0.2s ease;
}

.control-panel:hover {
    border-color: var(--color-primary-dim);
}

.control-panel h2 {
    font-size: 0.8em;
    font-weight: 700;
    text-align: center;
    color: var(--color-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    border-bottom: 1px solid #2a3449;
    padding-bottom: 6px;
    margin-bottom: 2px;
}

.control-group {
    display: grid;
    grid-template-columns: 60px 1fr 50px;
    align-items: center;
    gap: 8px;
}

.control-group label {
    font-size: 0.75em;
    color: var(--color-text-dim);
    text-align: right;
}

.control-group span {
    font-family: var(--font-mono);
    font-size: 0.75em;
    color: var(--color-primary-bright);
}

/* Range inputs */
input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 3px;
    background: #101622;
    border-radius: 2px;
    outline: none;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    background: var(--color-primary);
    border-radius: 50%;
    border: 2px solid var(--color-bg-light);
    transition: background 0.2s;
}

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

/* Buttons */
button {
    background: transparent;
    border: 1px solid var(--color-primary-dim);
    color: var(--color-primary);
    padding: 6px;
    font-family: var(--font-sans);
    font-weight: 700;
    font-size: 0.75em;
    cursor: pointer;
    border-radius: 5px;
    transition: all 0.15s ease;
    text-transform: uppercase;
}

button:hover {
    background: var(--color-primary-dim);
    color: var(--color-bg);
}

button.active {
    background: var(--color-primary);
    color: var(--color-bg);
    border-color: var(--color-primary);
}

.button-group {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 5px;
}

.filter-type .button-group,
.distortion-type .button-group {
    grid-template-columns: repeat(3, 1fr);
}

.button-group button {
    padding: 5px;
    font-size: 0.7em;
}

/* Visualizer as rack module */
.visualizer-panel canvas {
    width: 100%;
    height: 100%;
    min-height: 80px;
    flex: 1;
    background: #0a0f18;
    border-radius: 5px;
    border: 1px solid #1c2333;
}

/* Responsive */
@media (max-width: 900px) {
    .main-controls {
        grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    }
}

@media (max-width: 768px) {
    .terminal {
        padding: 10px;
    }
    .terminal-header h1 {
        font-size: 1.1em;
    }
    .performance-section {
        flex-direction: column;
    }
    .master-strip {
        flex-direction: row;
        min-width: unset;
        padding: 8px 12px;
        gap: 15px;
    }
    .master-knob {
        flex-direction: row;
        flex: 1;
    }
    .master-knob input[type="range"] {
        writing-mode: horizontal-tb;
        direction: ltr;
        height: 3px;
        width: 100%;
        -webkit-appearance: none;
    }
    .octave-control,
    .mode-control {
        flex-direction: row;
        gap: 6px;
    }
    .main-controls {
        grid-template-columns: 1fr;
    }
    .control-group {
        grid-template-columns: 50px 1fr 45px;
        gap: 6px;
    }
    #keyboard {
        height: 110px;
    }
    .key {
        width: 40px;
        height: 110px;
        font-size: 0.7em;
    }
    .key.black {
        width: 28px;
        height: 65px;
        font-size: 0.6em;
    }
    .key[data-key="a"] { left: calc(50% - 140px); }
    .key[data-key="s"] { left: calc(50% - 100px); }
    .key[data-key="d"] { left: calc(50% - 60px); }
    .key[data-key="f"] { left: calc(50% - 20px); }
    .key[data-key="g"] { left: calc(50% + 20px); }
    .key[data-key="h"] { left: calc(50% + 60px); }
    .key[data-key="j"] { left: calc(50% + 100px); }
    .key[data-key="k"] { left: calc(50% + 140px); }
    .key[data-key="w"] { left: calc(50% - 120px); }
    .key[data-key="e"] { left: calc(50% - 80px); }
    .key[data-key="t"] { left: calc(50% + 0px); }
    .key[data-key="y"] { left: calc(50% + 40px); }
    .key[data-key="u"] { left: calc(50% + 80px); }
}