:root {
    --bg: #1e1e24;
    --surface: #2b2b36;
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --text: #f3f4f6;
    --text-muted: #9ca3af;
    --key-white: #ffffff;
    --key-black: #111827;
    --key-selected: #3b82f6;
    --key-active: #ef4444;
}

* {
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
    background-color: var(--bg);
    color: var(--text);
    margin: 0;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
}

.header {
    width: 100%;
    max-width: 1200px;
    display: flex;
    flex-direction: column;  /* Stack items vertically */
    align-items: center;     /* Center align the title and controls container */
    text-align: center;
    margin-bottom: 25px;
    gap: 15px;
}

.header h1 {
    margin: 0;
}

.controls {
    display: flex;
    justify-content: center; /* Evenly center all inputs together */
    align-items: center;
    gap: 15px;
    flex-wrap: wrap;        /* Safely wrap links neatly on smaller screens */
    width: 100%;
}

button,
select {
    background-color: var(--surface);
    color: var(--text);
    border: 1px solid #4b5563;
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    outline: none;
    transition: all 0.2s;
}

button:hover,
select:hover {
    background-color: #374151;
}

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

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

.keyboard-wrapper {
    width: 100%;
    max-width: 1400px;
    /* Increased from 1200px to give it more room */
    overflow-x: auto;
    background: var(--surface);
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    margin: 0 auto 30px auto;
    /* Centers the wrapper itself */
    position: relative;
}

.keyboard-controls {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 15px;
}

.keyboard {
    display: flex;
    position: relative;
    height: 200px;
    user-select: none;
    min-width: max-content;
    margin: 0 auto;
    /* Centers the keyboard inside the wrapper */
    justify-content: center;
    /* Ensures keys cluster in the middle */
}

.key {
    border: 1px solid #ccc;
    border-radius: 0 0 6px 6px;
    cursor: pointer;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding-bottom: 10px;
    font-weight: bold;
    font-size: 12px;
    transition: background-color 0.1s;
}

.key.white {
    width: 44px;
    background: var(--key-white);
    color: var(--key-black);
    z-index: 1;
}

.key.black {
    width: 28px;
    height: 125px;
    background: var(--key-black);
    color: var(--text);
    z-index: 2;
    margin-left: -14px;
    margin-right: -14px;
    position: relative;
}

.key.selected {
    background-color: var(--key-selected) !important;
    color: white;
}

.key.active {
    background-color: var(--key-active) !important;
    color: white;
}

.results-container {
    display: flex;
    width: 100%;
    max-width: 1200px;
    gap: 20px;
    flex-wrap: wrap;
}

.results-column {
    flex: 1;
    min-width: 300px;
    background: var(--surface);
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.results-column h2 {
    margin-top: 0;
    color: var(--primary);
    font-size: 1.2rem;
    border-bottom: 1px solid #4b5563;
    padding-bottom: 10px;
}

.result-item {
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid #374151;
}

.result-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.result-name {
    font-weight: bold;
    font-size: 1.1rem;
    color: #fff;
    margin-bottom: 4px;
}

.result-notes {
    color: var(--text-muted);
    font-family: monospace;
    font-size: 1rem;
}

#loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(30, 30, 36, 0.9);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    flex-direction: column;
    gap: 10px;
}

.toggle-container {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: var(--surface);
    padding: 6px 12px;
    border-radius: 20px;
    border: 1px solid #4b5563;
    user-select: none;
}

.toggle-label-text {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-muted);
    transition: color 0.2s;
}

/* Gray out the inactive side dynamically */
#accidental-toggle:checked ~ .toggle-label-text:last-child { color: var(--text); }
#accidental-toggle:not(:checked) ~ .toggle-label-text:first-child { color: var(--text); }

/* The switch container */
.switch {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 22px;
}

/* Hide default HTML checkbox */
.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

/* The sliding track */
.slider {
    position: absolute;
    cursor: pointer;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: #4b5563;
    transition: .3s;
    border-radius: 22px;
}

/* The sliding knob */
.slider:before {
    position: absolute;
    content: "";
    height: 16px;
    width: 16px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .3s;
    border-radius: 50%;
    box-shadow: 0 1px 3px rgba(0,0,0,0.4);
}

/* Active track state color */
input:checked + .slider {
    background-color: var(--primary);
}

/* Knob movement */
input:checked + .slider:before {
    transform: translateX(22px);
}

/* --- PREVIEW FEATURE COLORS --- */
:root {
    /* Scale Preview Palette */
    --color-tonic: #ff8a05;       
    --color-subdominant: #9dc4ff;  
    --color-dominant: #7c89ff;     
    --color-scale-note: #d7d7d7;   

    /* Chord Preview Palette */
    --color-root: #D97706;         
    --color-third: #e19238;        
    --color-fifth: #e8ad6a;        
    --color-seventh: #f0c99b;      
    --color-extension: #f7e4cd;    
}

/* Base key utility adjustments */
.key.white { 
    position: relative; 
    transition: background-color 0.2s, color 0.2s;
}
.key.black {
    transition: background-color 0.2s, color 0.2s;
}

/* --- Scale Preview State Overrides --- */
.key.preview-tonic       { background-color: var(--color-tonic) !important; color: #fff; }
.key.preview-subdominant { background-color: var(--color-subdominant) !important; color: #000; } /* Dark text for light blue */
.key.preview-dominant    { background-color: var(--color-dominant) !important; color: #fff; }
.key.preview-note        { background-color: var(--color-scale-note) !important; color: #000; } /* Dark text for light gray */

/* --- Chord Preview State Overrides --- */
.key.preview-root        { background-color: var(--color-root) !important; color: #fff; }
.key.preview-third       { background-color: var(--color-third) !important; color: #fff; }
.key.preview-fifth       { background-color: var(--color-fifth) !important; color: #fff; }
.key.preview-seventh     { background-color: var(--color-seventh) !important; color: #fff; }
.key.preview-extension   { background-color: var(--color-extension) !important; color: #fff; }

/* Custom Tooltips */
.key[data-tooltip]::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: #111827;
    color: #fff;
    padding: 6px 10px;
    border-radius: 6px;
    font-size: 11px;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s, transform 0.2s;
    z-index: 10;
    margin-bottom: 5px;
    border: 1px solid #4b5563;
    box-shadow: 0 4px 6px rgba(0,0,0,0.3);
}

.key:hover[data-tooltip]::after {
    opacity: 1;
    transform: translateX(-50%) translateY(-5px);
}

/* Clickable Results Styling */
.result-item {
    cursor: pointer;
    transition: background 0.2s, padding-left 0.2s;
    border-left: 0px solid var(--primary);
}

.result-item:hover {
    background: #374151;
    border-radius: 6px;
    padding-left: 10px;
}

.result-item.active-preview {
    background: #374151;
    border-radius: 0 6px 6px 0;
    border-left: 4px solid var(--primary);
    padding-left: 10px;
}

/* Legend Styling */
.legend-container {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid #4b5563;
    flex-wrap: wrap;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-muted);
}

.legend-color {
    width: 14px;
    height: 14px;
    border-radius: 3px;
    display: inline-block;
}