:root {
    /* Color Palette - Black & Green Theme */
    --bg-color: #101010;
    --ui-color: #181818;
    --panel-color: #202020;
    --surface-color: #282828;
    --text-color: #E0E0E0;
    --text-color-muted: #888888;
    
    /* Accent Colors */
    --accent-color-subtractive: #39FF14;
    --accent-color-glow-subtractive: rgba(57, 255, 20, 0.4);

    /* Main accent color */
    --accent-color: var(--accent-color-subtractive);
    --accent-color-glow: var(--accent-color-glow-subtractive);

    --display-bg: #050805;
    
    --shadow-dark: rgba(0, 0, 0, 0.6);
    --shadow-light: rgba(255, 255, 255, 0.06);

    --knob-rotation: -135deg;
}

/* Base page styles */
body {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    margin: 0;
    background-color: var(--bg-color);
    font-family: 'Inter', sans-serif;
    color: var(--text-color);
    user-select: none;
    -webkit-user-select: none;
    -webkit-tap-highlight-color: transparent;
}

/* Main synthesizer container */
.synth-container {
    width: 1100px;
    max-width: 98vw;
    padding: 24px;
    background-color: var(--ui-color);
    border-radius: 20px;
    border: 1px solid var(--shadow-light);
    box-shadow: 0 10px 30px var(--shadow-dark), 0 0 20px var(--accent-color-glow);
    transition: box-shadow 0.3s ease;
}

.main-controls-grid {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 24px;
    margin-bottom: 24px;
}

.left-column {
    display: flex;
    gap: 16px;
    align-items: center;
}

/* === MODIFICATION START: Styles for brand link and hover effect === */
.brand-link {
    text-decoration: none;
    color: inherit;
}

.brand {
    writing-mode: vertical-rl;
    transform: rotate(180deg);
    color: var(--text-color-muted); /* Muted color by default */
    background-color: var(--panel-color);
    padding: 1.2rem 0.6rem;
    border-radius: 12px;
    text-align: center;
    font-family: 'JetBrains Mono', monospace;
    font-weight: 700;
    letter-spacing: 4px;
    font-size: 16px;
    height: 254px; 
    border: 1px solid var(--shadow-light);
    transition: color 0.2s ease, text-shadow 0.2s ease; /* Smooth transition for color and shadow */
}

.brand-link:hover .brand {
    color: var(--accent-color); /* Bright green on hover */
    text-shadow: 0 0 5px var(--accent-color-glow); /* Glow effect on hover */
}
/* === MODIFICATION END === */

.japanese-text {
    margin-top: 16px;
    font-size: 12px;
    font-weight: 500;
    color: var(--text-color-muted);
    letter-spacing: 2px;
    transition: color 0.2s ease, text-shadow 0.2s ease; /* Smooth transition for hover effect */
}

/* Make Japanese text glow on hover as well */
.brand-link:hover .japanese-text {
    color: var(--accent-color);
    text-shadow: 0 0 5px var(--accent-color-glow);
}

.fader-wrapper { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 12px; }
.fader-label { font-family: 'JetBrains Mono', monospace; font-size: 10px; font-weight: 700; color: var(--text-color-muted); text-transform: uppercase; }
.fader-container { position: relative; width: 24px; height: 216px; display: flex; align-items: center; justify-content: center; }
.fader-track { width: 6px; height: 100%; background-color: var(--bg-color); border-radius: 3px; box-shadow: inset 0 0 5px var(--shadow-dark); }
.fader-slider { -webkit-appearance: none; appearance: none; width: 216px; height: 24px; background: transparent; cursor: pointer; position: absolute; transform: rotate(-90deg); }
.fader-slider::-webkit-slider-thumb { -webkit-appearance: none; appearance: none; width: 44px; height: 22px; background: var(--surface-color); border-radius: 6px; border: 1px solid var(--shadow-light); box-shadow: 0 2px 5px var(--shadow-dark); transition: background-color 0.2s; }
.fader-slider:hover::-webkit-slider-thumb { background-color: var(--accent-color); }

.right-column .main-panel { background-color: var(--panel-color); border-radius: 16px; padding: 16px; border: 1px solid var(--shadow-light); display: flex; flex-direction: column; gap: 16px; }

.display { 
    background-color: var(--display-bg); 
    border-radius: 12px; 
    height: 80px; 
    padding: 8px 12px; 
    box-shadow: inset 0 0 8px var(--shadow-dark); 
    position: relative; 
    overflow: hidden;
    font-family: 'JetBrains Mono', monospace;
    display: grid;
    grid-template-rows: auto 1fr auto;
    gap: 4px;
}

.display-top-line, .display-bottom-line {
    font-size: 9px;
    color: var(--text-color-muted);
    display: flex;
    justify-content: space-between;
    align-items: center;
    min-height: 12px;
}

.display-main {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

#display-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.5;
}

#display-text {
    font-size: 14px;
    font-weight: 700;
    color: var(--accent-color);
    position: relative;
    z-index: 2;
    text-shadow: 0 0 8px var(--accent-color-glow);
    white-space: pre; /* Preserve whitespace for formatting */
}

.knob-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 16px;
}

.control-panel {
    display: flex;
    flex-direction: column;
    gap: 12px;
    align-items: center;
    padding: 12px;
    background-color: var(--surface-color);
    border-radius: 12px;
    box-shadow: inset 0 2px 5px var(--shadow-dark);
}

.panel-title {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    font-weight: 700;
    color: var(--text-color-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 4px;
}

.knob-wrapper { display: flex; flex-direction: column; align-items: center; gap: 8px; }
.knob-label { font-family: 'JetBrains Mono', monospace; font-size: 10px; font-weight: 700; color: var(--text-color-muted); }
.knob { width: 54px; height: 54px; border-radius: 50%; background: linear-gradient(145deg, #303030, #222222); position: relative; cursor: ns-resize; box-shadow: 0 5px 10px rgba(0,0,0,0.4), inset 0 2px 2px rgba(255,255,255,0.05); display: flex; align-items: center; justify-content: center; transition: transform 0.1s ease; }
.knob:active { transform: scale(0.95); }
.knob::before { content: ''; position: absolute; top: 5px; left: 5px; right: 5px; bottom: 5px; border-radius: 50%; background: var(--surface-color); box-shadow: inset 0 3px 5px rgba(0,0,0,0.3); }
.knob::after { content: ''; position: absolute; width: 4px; height: 12px; border-radius: 2px; background-color: var(--accent-color); box-shadow: 0 0 5px var(--accent-color-glow); top: 6px; left: calc(50% - 2px); transform-origin: 50% 21px; transform: rotate(var(--knob-rotation)); transition: background-color 0.3s ease, box-shadow 0.3s ease; }

.waveform-selector {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 6px;
    width: 70px; /* Adjust width to fit 2x2 grid */
}
.wave-btn {
    width: 32px; height: 32px; border: 1px solid var(--shadow-light); border-radius: 8px;
    background-color: var(--surface-color); box-shadow: 0 3px 6px var(--shadow-dark);
    cursor: pointer; transition: all 0.1s ease-in-out; color: var(--text-color-muted);
    font-weight: 700; font-family: 'JetBrains Mono', monospace; font-size: 12px;
    display: flex; align-items: center; justify-content: center;
}
.wave-btn:active { transform: translateY(1px); box-shadow: 0 1px 3px var(--shadow-dark); }
.wave-btn.active { background-color: var(--accent-color); color: var(--display-bg); box-shadow: 0 0 12px var(--accent-color-glow); }

.keyboard-container { display: flex; gap: 4px; padding: 16px; background-color: var(--panel-color); border-radius: 16px; border: 1px solid var(--shadow-light); }
.key { position: relative; flex-grow: 1; height: 140px; border-radius: 8px; cursor: pointer; transition: all 0.05s ease-in-out; }
.key.white { background: linear-gradient(180deg, #e0e0e0, #c0c0c0); border-bottom: 4px solid #888; box-shadow: 0 2px 5px var(--shadow-dark); }
.key.black {
    position: absolute; width: 60%; height: 65%;
    background: linear-gradient(180deg, #3a3d44, #2a2d34);
    border-bottom: 4px solid #101010; z-index: 2; top: 0; left: 100%;
    transform: translateX(-50%); border-radius: 0 0 6px 6px;
}
.key.white.active { transform: translateY(2px); }
.key.black.active { transform: translateX(-50%) translateY(2px); }
.key.active { background: var(--accent-color); border-bottom-width: 2px; box-shadow: 0 0 15px var(--accent-color-glow); }
.key-wrapper { position: relative; flex-grow: 1; display: flex; }