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

:root {
    --bg-dark: #0a0a0a;
    --bg-panel: #141414;
    --bg-card: #1a1a1a;
    --accent-primary: #ff3366;
    --accent-secondary: #00ffaa;
    --accent-tertiary: #ffff00;
    --text-primary: #ffffff;
    --text-secondary: #888888;
    --border-color: #333333;
    --glow-primary: rgba(255, 51, 102, 0.4);
    --glow-secondary: rgba(0, 255, 170, 0.3);
}

body {
    font-family: 'Courier New', monospace;
    background: var(--bg-dark);
    min-height: 100vh;
    padding: 20px;
    color: var(--text-primary);
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 2px,
            rgba(255, 51, 102, 0.03) 2px,
            rgba(255, 51, 102, 0.03) 4px
        ),
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 2px,
            rgba(0, 255, 170, 0.02) 2px,
            rgba(0, 255, 170, 0.02) 4px
        );
    pointer-events: none;
    z-index: 1000;
}

.app {
    max-width: 1400px;
    margin: 0 auto;
}

header {
    text-align: center;
    margin-bottom: 20px;
    position: relative;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-bottom: 5px;
}

.logo-icon {
    font-size: 2em;
    color: var(--accent-primary);
    text-shadow: 0 0 20px var(--glow-primary), 0 0 40px var(--glow-primary);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.7; transform: scale(1.1); }
}

h1 {
    font-size: 2em;
    font-weight: 900;
    letter-spacing: -2px;
    text-transform: uppercase;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tagline {
    font-size: 0.9em;
    color: var(--text-secondary);
    letter-spacing: 3px;
    text-transform: uppercase;
}

.main-panel {
    display: grid;
    grid-template-columns: 1fr;
    gap: 15px;
    margin-bottom: 15px;
}

@media (min-width: 1100px) {
    .main-panel {
        grid-template-columns: 340px 1fr;
    }
}

.left-column {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.control-section {
    background: var(--bg-panel);
    border: 1px solid var(--border-color);
    padding: 8px 10px;
}

.section-title {
    font-size: 0.55em;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--accent-secondary);
    margin-bottom: 6px;
    padding-bottom: 4px;
    border-bottom: 1px solid var(--border-color);
}

.controls-panel {
    background: var(--bg-panel);
    padding: 0;
    position: relative;
}

.status-panel {
    background: var(--bg-panel);
    border: 2px solid var(--border-color);
    padding: 15px;
    position: relative;
}

.controls-panel::before, .status-panel::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    z-index: -1;
    opacity: 0;
    transition: opacity 0.3s;
}

.controls-panel:hover::before, .status-panel:hover::before {
    opacity: 1;
}

.panel-header {
    display: none;
}

.panel-icon {
    font-size: 1.2em;
    color: var(--accent-secondary);
}

.panel-header h2 {
    font-size: 0.9em;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--text-secondary);
}

.control-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 6px 8px;
}

@media (max-width: 500px) {
    .control-grid {
        grid-template-columns: 1fr;
    }
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.control-group label {
    font-size: 0.55em;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-secondary);
}

.styled-select {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 5px 6px;
    font-family: inherit;
    font-size: 0.7em;
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='10' fill='%23888888'%3E%3Cpath d='M5 7L0 2h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 6px center;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.styled-select:hover, .styled-select:focus {
    border-color: var(--accent-primary);
    outline: none;
    box-shadow: 0 0 15px var(--glow-primary);
}

.slider-group {
    display: flex;
    align-items: center;
    gap: 4px;
}

.slider-group input[type="range"] {
    flex: 1;
    -webkit-appearance: none;
    appearance: none;
    height: 3px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    cursor: pointer;
    min-width: 40px;
    max-width: 70px;
}

.slider-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 10px;
    height: 10px;
    background: var(--accent-primary);
    border: none;
    cursor: pointer;
    box-shadow: 0 0 5px var(--glow-primary);
    transition: transform 0.1s;
}

.slider-group input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.slider-group input[type="range"]::-moz-range-thumb {
    width: 10px;
    height: 10px;
    background: var(--accent-primary);
    border: none;
    cursor: pointer;
    box-shadow: 0 0 5px var(--glow-primary);
}

.slider-value {
    min-width: 40px;
    text-align: right;
    font-size: 0.65em;
    color: var(--accent-secondary);
    font-weight: bold;
    white-space: nowrap;
}

.status-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-bottom: 15px;
}

@media (max-width: 600px) {
    .status-row {
        grid-template-columns: 1fr;
    }
}

.status-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 10px;
    text-align: center;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.status-card:hover {
    border-color: var(--accent-secondary);
    box-shadow: 0 0 15px var(--glow-secondary);
}

.status-label {
    display: block;
    font-size: 0.7em;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.status-value {
    display: block;
    font-size: 1.4em;
    font-weight: bold;
    color: var(--text-primary);
}

.status-card.fundamental .status-value {
    font-size: 1.6em;
    color: var(--accent-primary);
}

.status-card.notes .status-value {
    color: var(--accent-secondary);
}

.notes-panel {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 12px;
    grid-column: 1 / -1;
    min-height: 100px;
}

.notes-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 10px;
    font-size: 0.7em;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--text-secondary);
}

.notes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
    gap: 8px;
    min-height: 120px;
}

.note-item {
    background: var(--bg-panel);
    border: 1px solid var(--border-color);
    padding: 8px 10px;
    text-align: center;
    animation: noteAppear 0.2s ease-out;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.note-item:hover {
    border-color: var(--accent-primary);
    box-shadow: 0 0 10px var(--glow-primary);
}

.note-item.is-fundamental {
    border-color: var(--accent-primary);
    background: rgba(255, 51, 102, 0.1);
}

.note-item.is-fundamental .note-name {
    color: var(--accent-primary);
}

.note-item .note-name {
    font-weight: bold;
    color: var(--accent-secondary);
    display: block;
    font-size: 1em;
    margin-bottom: 4px;
    text-transform: uppercase;
}

.note-item .note-freq {
    color: var(--text-primary);
    font-size: 1.5em;
    font-weight: bold;
    display: block;
}

.note-item .note-ratio {
    color: var(--accent-tertiary);
    font-size: 0.8em;
    display: block;
    margin-top: 4px;
}

@keyframes noteAppear {
    from { opacity: 0; transform: scale(0.8); }
    to { opacity: 1; transform: scale(1); }
}

.note-empty {
    color: var(--text-secondary);
    font-style: italic;
    grid-column: 1 / -1;
    padding: 20px;
    text-align: center;
}

.keyboard-container {
    margin-bottom: 15px;
    padding: 10px;
    background: var(--bg-panel);
    border: 2px solid var(--border-color);
    overflow-x: auto;
}

.keyboard {
    display: flex;
    position: relative;
    height: 140px;
    width: fit-content;
}

.octave-label {
    position: absolute;
    bottom: -25px;
    font-size: 0.7em;
    color: var(--text-secondary);
    text-transform: uppercase;
}

.key {
    position: relative;
    cursor: pointer;
    user-select: none;
    transition: all 0.05s;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding-bottom: 12px;
    font-size: 0.75em;
    font-weight: bold;
}

.key.white {
    width: 40px;
    height: 130px;
    background: linear-gradient(180deg, #ffffff 0%, #e8e8e8 100%);
    border: 2px solid #111;
    border-radius: 0 0 6px 6px;
    z-index: 1;
    color: #222;
    margin: 0 1px;
    font-size: 0.65em;
}

.key.white:hover {
    background: linear-gradient(180deg, #ffffff 0%, #d0d0d0 100%);
}

.key.white.active {
    background: linear-gradient(180deg, var(--accent-primary) 0%, #cc0033 100%);
    color: white;
    transform: translateY(3px);
    box-shadow: 0 -5px 20px var(--glow-primary), 0 4px 10px rgba(0, 0, 0, 0.4) inset;
}

.key.black {
    position: absolute;
    width: 26px;
    height: 80px;
    background: linear-gradient(180deg, #2a2a2a 0%, #0a0a0a 100%);
    border: 2px solid #000;
    border-radius: 0 0 4px 4px;
    z-index: 2;
    color: #888;
    padding-bottom: 6px;
    top: 0;
}

.key.black:hover {
    background: linear-gradient(180deg, #3a3a3a 0%, #1a1a1a 100%);
}

.key.black.active {
    background: linear-gradient(180deg, var(--accent-secondary) 0%, #00cc88 100%);
    color: #000;
    transform: translateY(3px);
    box-shadow: 0 -5px 15px var(--glow-secondary), 0 4px 10px rgba(0, 0, 0, 0.4) inset;
}

.key.black[data-note="49"] { left: 29px; }
.key.black[data-note="51"] { left: 71px; }
.key.black[data-note="54"] { left: 155px; }
.key.black[data-note="56"] { left: 197px; }
.key.black[data-note="58"] { left: 239px; }
.key.black[data-note="61"] { left: 323px; }  /* 29 + 294 */
.key.black[data-note="63"] { left: 365px; }  /* 71 + 294 */
.key.black[data-note="66"] { left: 449px; }  /* 155 + 294 */
.key.black[data-note="68"] { left: 491px; }  /* 197 + 294 */
.key.black[data-note="70"] { left: 533px; }  /* 239 + 294 */

footer {
    text-align: center;
    padding: 20px;
}

.keyboard-hint {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    flex-wrap: wrap;
}

.key-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 35px;
    height: 35px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    font-size: 0.9em;
    font-weight: bold;
    color: var(--text-primary);
}

.key-badge.black-key {
    background: #333;
    border-color: #000;
    color: #888;
}

.hint-text {
    font-size: 0.75em;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin: 0 10px;
}

.start-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    cursor: pointer;
    transition: opacity 0.5s;
}

.start-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.start-content {
    text-align: center;
}

.start-content h2 {
    font-size: 2em;
    margin-bottom: 20px;
    color: var(--accent-primary);
}

.start-content p {
    color: var(--text-secondary);
    font-size: 1.2em;
    animation: blink 1s ease-in-out infinite;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

.tuning-indicator {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: var(--bg-panel);
    border: 1px solid var(--border-color);
    padding: 10px 15px;
    font-size: 0.75em;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-secondary);
}

.tuning-indicator .mode {
    color: var(--accent-tertiary);
    font-weight: bold;
}

.control-buttons {
    display: flex;
    gap: 8px;
    margin-top: 15px;
    padding-top: 12px;
    border-top: 1px solid var(--border-color);
}

.control-btn {
    flex: 1;
    padding: 8px 10px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.7em;
    text-transform: uppercase;
    letter-spacing: 1px;
    cursor: pointer;
    transition: all 0.2s;
}

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

.control-btn.active {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: white;
}

.control-btn.small {
    padding: 6px 8px;
    font-size: 0.65em;
}

.viz-panel {
    margin-top: 12px;
    border: 1px solid var(--border-color);
    background: var(--bg-card);
    padding: 10px;
}

#vizCanvas {
    width: 100%;
    height: 100px;
    display: block;
}

.ratios-panel {
    margin-top: 12px;
    border: 1px solid var(--border-color);
    background: var(--bg-card);
    padding: 10px;
    display: none;
}

.ratios-panel.visible {
    display: block;
}

.ratios-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 6px;
}

.ratio-input {
    background: var(--bg-panel);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 6px;
    font-size: 0.7em;
    font-family: inherit;
    font-size: 0.8em;
    text-align: center;
}

.ratio-input:focus {
    outline: none;
    border-color: var(--accent-secondary);
}