/* ===== CSS VARIABLES (Theme System) ===== */
:root {
    /* Colors - will be overridden by theme manager */
    --color-primary: #667eea;
    --color-secondary: #764ba2;
    --color-accent: #ecc94b;
    --color-background: #1a1a2e;
    --color-surface: #16213e;
    --color-surface2: #2d3748;
    --color-text: #ffffff;
    --color-text-secondary: #a0aec0;
    --color-success: #48bb78;
    --color-danger: #e53e3e;
    --color-warning: #ecc94b;
    --color-border: #4a5568;

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    /* Border radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ===== RESET & BASE ===== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--color-background), var(--color-surface));
    min-height: 100vh;
    color: var(--color-text);
    line-height: 1.6;
}

/* ===== CONTAINER ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-lg);
    position: relative;
}

/* ===== SCREEN MANAGEMENT ===== */
.screen {
    display: none;
    animation: fadeIn 0.3s ease;
}

.screen.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== HEADER ===== */
.header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.title {
    font-size: 3em;
    font-weight: 700;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
}

.subtitle {
    color: var(--color-text-secondary);
    font-size: 1.2em;
}

/* ===== STATS BAR ===== */
.stats-bar {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-md);
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.stat-item {
    text-align: center;
}

.stat-label {
    display: block;
    font-size: 0.85em;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
}

.stat-value {
    display: block;
    font-size: 1.8em;
    font-weight: 700;
    color: var(--color-primary);
}

/* ===== MODE GRID ===== */
.mode-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.mode-btn {
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    cursor: pointer;
    transition: all var(--transition-normal);
    text-align: center;
}

.mode-btn:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    border-color: var(--color-primary);
    background: linear-gradient(135deg, var(--color-surface), var(--color-surface2));
}

.mode-icon {
    font-size: 3em;
    margin-bottom: var(--spacing-sm);
}

.mode-name {
    font-size: 1.2em;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
}

.mode-desc {
    font-size: 0.9em;
    color: var(--color-text-secondary);
}

/* ===== BUTTONS ===== */
.btn {
    padding: 12px 24px;
    font-size: 1em;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    color: var(--color-text);
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: var(--color-surface2);
}

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

.btn-success {
    background: var(--color-success);
}

.btn-danger {
    background: var(--color-danger);
}

.btn-warning {
    background: var(--color-warning);
    color: var(--color-background);
}

.btn-back {
    position: absolute;
    top: var(--spacing-lg);
    left: var(--spacing-lg);
    padding: 10px 20px;
    background: var(--color-surface2);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text);
    cursor: pointer;
    font-size: 1em;
    transition: all var(--transition-fast);
}

.btn-back:hover {
    background: var(--color-border);
    transform: translateX(-4px);
}

.bottom-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
}

.bottom-buttons .btn {
    flex: 1;
    max-width: 200px;
}

/* ===== SCREEN SPECIFIC STYLING ===== */
h2 {
    text-align: center;
    font-size: 2em;
    margin: var(--spacing-xl) 0 var(--spacing-lg) 0;
    color: var(--color-text);
}

h3 {
    font-size: 1.3em;
    margin-bottom: var(--spacing-md);
    color: var(--color-primary);
}

/* ===== STATS SCREEN ===== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.stats-card {
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
}

.stat-row {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--color-border);
}

.stat-row:last-child {
    border-bottom: none;
}

.mode-stats-list,
.highscores-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.mode-stat,
.highscore-row {
    padding: var(--spacing-sm);
    background: var(--color-surface2);
    border-radius: var(--radius-sm);
    display: flex;
    justify-content: space-between;
}

.mode-stat-name {
    font-weight: 600;
}

/* ===== SETTINGS SCREEN ===== */
.settings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.settings-card {
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
}

.setting-row {
    margin-bottom: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.setting-row label {
    font-weight: 600;
    color: var(--color-text-secondary);
}

.setting-row input[type="checkbox"] {
    width: 24px;
    height: 24px;
    cursor: pointer;
}

.setting-row input[type="range"] {
    width: 100%;
    cursor: pointer;
}

.setting-row select {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-surface2);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text);
    font-size: 1em;
}

.volume-control {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.volume-control input {
    flex: 1;
}

/* ===== ACHIEVEMENTS NOTIFICATION ===== */
.achievement-notification {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--color-success);
    color: var(--color-background);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
    z-index: 1000;
    transform: translateX(400px);
    opacity: 0;
    transition: all var(--transition-normal);
}

.achievement-notification.show {
    transform: translateX(0);
    opacity: 1;
}

.achievement-icon {
    font-size: 3em;
}

.achievement-content {
    flex: 1;
}

.achievement-name {
    font-size: 1.2em;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.achievement-desc {
    font-size: 0.9em;
    opacity: 0.9;
}

/* ===== CANVAS STYLING ===== */
canvas {
    display: block;
    width: 100%;
    border-radius: var(--radius-md);
    background: var(--color-background);
}

.canvas-container {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

/* ===== CONTROLS ===== */
.controls {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.control-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.control-row:last-child {
    margin-bottom: 0;
}

.control-row label {
    font-weight: 600;
    color: var(--color-text-secondary);
}

.control-row input[type="number"],
.control-row input[type="range"] {
    padding: var(--spacing-sm);
    background: var(--color-surface2);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text);
    font-size: 1em;
}

.control-row input[type="number"] {
    width: 80px;
    text-align: center;
}

/* ===== DISPLAY AREA ===== */
.display-area {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    min-height: 200px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin: var(--spacing-lg) 0;
}

.instruction-text {
    font-size: 2em;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
    .container {
        padding: var(--spacing-md);
    }

    .title {
        font-size: 2em;
    }

    .subtitle {
        font-size: 1em;
    }

    .mode-grid {
        grid-template-columns: 1fr;
    }

    .stats-bar {
        grid-template-columns: repeat(2, 1fr);
    }

    .stats-grid,
    .settings-grid {
        grid-template-columns: 1fr;
    }

    .achievement-notification {
        right: 10px;
        left: 10px;
        transform: translateY(-200px);
    }

    .achievement-notification.show {
        transform: translateY(0);
    }

    .btn-back {
        position: static;
        margin-bottom: var(--spacing-md);
    }

    h2 {
        font-size: 1.5em;
        margin-top: 0;
    }
}

/* ===== KEYBOARD DISPLAY (for improv mode) ===== */
.keyboard-container {
    background: var(--color-surface);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin: var(--spacing-md) 0;
}

.keyboard {
    display: flex;
    position: relative;
    height: 120px;
    justify-content: center;
    margin: var(--spacing-md) auto;
    max-width: 800px;
}

.key {
    position: relative;
    border-radius: 0 0 5px 5px;
    transition: all var(--transition-fast);
    cursor: pointer;
}

.key.white {
    width: 40px;
    height: 120px;
    background: linear-gradient(180deg, #f7f7f7, #e8e8e8);
    border: 1px solid #ccc;
    margin: 0 1px;
    z-index: 1;
}

.key.black {
    width: 28px;
    height: 75px;
    background: linear-gradient(180deg, #333, #111);
    margin: 0 -14px;
    z-index: 2;
    border-radius: 0 0 4px 4px;
}

.key.highlighted {
    background: linear-gradient(180deg, var(--color-primary), var(--color-secondary)) !important;
}

.key.active {
    background: linear-gradient(180deg, var(--color-success), var(--color-success)) !important;
    transform: scale(1.05);
    box-shadow: 0 0 15px var(--color-success);
}

/* ===== LOADING & ERROR STATES ===== */
.loading {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--color-text-secondary);
}

.error {
    background: var(--color-danger);
    color: var(--color-text);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin: var(--spacing-md) 0;
    text-align: center;
}

/* ===== UTILITY CLASSES ===== */
.text-center {
    text-align: center;
}

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

.hidden {
    display: none;
}

/* ===== CHOICE BUTTONS (for ear training, rhythm dictation) ===== */
.choices-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.choice-btn {
    padding: var(--spacing-lg);
    background: var(--color-surface2);
    border: 3px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text);
    font-size: 1.1em;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.choice-btn:hover {
    background: var(--color-border);
    transform: scale(1.05);
}

.choice-btn.correct {
    background: var(--color-success);
    border-color: var(--color-success);
    animation: pulse 0.5s;
}

.choice-btn.incorrect {
    background: var(--color-danger);
    border-color: var(--color-danger);
    animation: shake 0.5s;
}

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

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    75% { transform: translateX(10px); }
}

/* ===== METRONOME & TEMPO DISPLAYS ===== */
.metronome-visual {
    text-align: center;
    padding: var(--spacing-xl);
}

.tempo-display {
    font-size: 4em;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.beat-indicator-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    margin: var(--spacing-xl) 0;
}

.beat-indicator {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: var(--color-surface2);
    transition: all 0.1s ease;
}

.beat-indicator.pulse {
    background: var(--color-primary);
    transform: scale(1.3);
    box-shadow: 0 0 30px var(--color-primary);
}

.beat-number {
    font-size: 2em;
    font-weight: 700;
    color: var(--color-text);
}

.elapsed-time {
    font-size: 1.5em;
    color: var(--color-text-secondary);
    margin-top: var(--spacing-lg);
}

/* ===== SCALE & PATTERN DISPLAYS ===== */
.scale-display {
    text-align: center;
    margin: var(--spacing-lg) 0;
}

.scale-name {
    font-size: 2.5em;
    font-weight: 700;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-md);
}

.pattern-name {
    font-size: 1.5em;
    font-weight: 600;
    color: var(--color-accent);
}

.phase-display {
    text-align: center;
    margin: var(--spacing-lg) 0;
}

/* ===== STATS ROW (for exercises) ===== */
.stats-row {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
}

.stat {
    text-align: center;
}

/* ===== BUTTON SIZES ===== */
.btn-large {
    padding: var(--spacing-lg) var(--spacing-xl);
    font-size: 1.3em;
    min-width: 150px;
}

/* ===== TEXT UTILITIES ===== */
.text-secondary {
    color: var(--color-text-secondary);
}

/* ===== PHASE & STATUS BADGES ===== */
.phase-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: 20px;
    font-size: 0.9em;
    font-weight: 600;
}

.phase-badge.active {
    background: var(--color-success);
    color: var(--color-background);
}

.phase-badge.ghost {
    background: var(--color-primary);
    color: var(--color-text);
}

/* ===== ADDITIONAL RESPONSIVE ADJUSTMENTS ===== */
@media (max-width: 768px) {
    .tempo-display {
        font-size: 3em;
    }

    .beat-indicator {
        width: 60px;
        height: 60px;
    }

    .scale-name {
        font-size: 1.8em;
    }

    .pattern-name {
        font-size: 1.2em;
    }

    .stats-row {
        gap: var(--spacing-md);
    }
}

/* ===== GUITAR EXERCISES STYLING ===== */

/* Category Navigation */
.category-nav {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.category-btn {
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    text-align: center;
}

.category-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow-color);
    border-color: var(--color-primary);
}

.category-btn.active {
    border-color: var(--color-primary);
    background: var(--color-surface2);
    box-shadow: 0 0 20px rgba(var(--primary-rgb), 0.3);
}

.category-icon {
    font-size: 2em;
    margin-bottom: var(--spacing-sm);
}

.category-name {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text);
}

.category-stats {
    font-size: 0.85em;
    color: var(--color-text-secondary);
    display: flex;
    flex-direction: column;
    gap: 2px;
}

/* Exercise List */
.exercise-list {
    display: grid;
    gap: var(--spacing-md);
}

.exercise-card {
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    transition: all var(--transition-normal);
}

.exercise-card:hover {
    box-shadow: 0 4px 12px var(--shadow-color);
    transform: translateY(-2px);
}

.exercise-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.exercise-header h4 {
    margin: 0;
    color: var(--color-text);
}

.difficulty-badge {
    padding: 4px 12px;
    border-radius: var(--radius-sm);
    font-size: 0.85em;
    font-weight: 600;
}

.difficulty-badge.beginner {
    background: var(--color-success);
    color: var(--color-background);
}

.difficulty-badge.intermediate {
    background: #3498db;
    color: var(--color-background);
}

.difficulty-badge.advanced {
    background: #e67e22;
    color: var(--color-background);
}

.difficulty-badge.expert {
    background: #e74c3c;
    color: var(--color-background);
}

.exercise-description {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.5;
}

.exercise-progress {
    margin-bottom: var(--spacing-md);
}

.advancement-ready {
    color: var(--color-success);
    font-weight: 600;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

.exercise-meta {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    font-size: 0.9em;
    color: var(--color-text-secondary);
}

.exercise-actions {
    display: flex;
    gap: var(--spacing-sm);
}

/* BPM Ladder */
.bpm-ladder-container {
    margin: var(--spacing-lg) 0;
}

.bpm-ladder {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
    margin-top: var(--spacing-md);
}

.ladder-rung {
    padding: 8px 14px;
    background: var(--color-surface2);
    border-radius: var(--radius-sm);
    font-size: 0.9em;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 2px solid transparent;
}

.ladder-rung:hover {
    transform: scale(1.1);
    border-color: var(--color-primary);
}

.ladder-rung.completed {
    background: var(--color-success);
    color: var(--color-background);
}

.ladder-rung.current {
    background: var(--color-primary);
    color: var(--color-text);
    transform: scale(1.2);
    box-shadow: 0 0 15px rgba(var(--primary-rgb), 0.5);
}

/* Practice Session UI */
.practice-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.advancement-notice {
    background: linear-gradient(135deg, var(--color-success), var(--color-primary));
    color: var(--color-background);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    text-align: center;
    font-weight: 600;
}

.exercise-description-box {
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.exercise-description-box h4 {
    margin-top: 0;
    color: var(--color-primary);
}

.metronome-display {
    text-align: center;
    margin: var(--spacing-xl) 0;
}

.tempo-display {
    font-size: 5em;
    font-weight: 700;
    color: var(--color-primary);
    text-shadow: 0 0 20px rgba(var(--primary-rgb), 0.5);
}

.subdivision-display {
    font-size: 1.5em;
    color: var(--color-text-secondary);
    margin-top: var(--spacing-sm);
}

.metronome-controls {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    align-items: center;
}

.tempo-adjustment {
    display: flex;
    gap: var(--spacing-sm);
}

.subdivision-controls {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
    justify-content: center;
}

.subdivision-controls select {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-surface);
    color: var(--color-text);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 1em;
}

/* Session Timer */
.session-timer {
    text-align: center;
    font-size: 1.5em;
    color: var(--color-text-secondary);
}

.timer-display {
    color: var(--color-primary);
    font-weight: 700;
}

/* Session Log Form */
.session-log-section {
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
}

.form-row {
    margin-bottom: var(--spacing-md);
}

.form-row label {
    display: block;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text);
    font-weight: 600;
}

.form-row input[type="number"],
.form-row select,
.form-row textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-background);
    color: var(--color-text);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 1em;
    font-family: inherit;
}

.form-row textarea {
    resize: vertical;
}

.quality-buttons,
.accuracy-buttons {
    display: flex;
    gap: var(--spacing-sm);
}

.quality-btn,
.accuracy-btn {
    flex: 1;
    padding: var(--spacing-md);
    background: var(--color-surface);
    color: var(--color-text);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-weight: 600;
}

.quality-btn:hover,
.accuracy-btn:hover {
    transform: scale(1.05);
    border-color: var(--color-primary);
}

.quality-btn.active,
.accuracy-btn.active {
    background: var(--color-primary);
    color: var(--color-text);
    border-color: var(--color-primary);
    box-shadow: 0 0 15px rgba(var(--primary-rgb), 0.5);
}

.accuracy-btn.gold {
    border-color: gold;
}

.accuracy-btn.gold.active {
    background: gold;
    color: #1a1a2e;
}

.accuracy-btn.silver {
    border-color: silver;
}

.accuracy-btn.silver.active {
    background: silver;
    color: #1a1a2e;
}

.accuracy-btn.bronze {
    border-color: #cd7f32;
}

.accuracy-btn.bronze.active {
    background: #cd7f32;
    color: #1a1a2e;
}

/* Progress Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.modal-content {
    background: var(--color-background);
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-lg);
    max-width: 600px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    border-bottom: 2px solid var(--color-border);
}

.modal-header h3 {
    margin: 0;
    color: var(--color-primary);
}

.btn-close {
    background: none;
    border: none;
    color: var(--color-text);
    font-size: 2em;
    cursor: pointer;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-close:hover {
    color: var(--color-primary);
}

.modal-body {
    padding: var(--spacing-lg);
}

.progress-summary {
    display: grid;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.stat-item {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-sm);
    background: var(--color-surface);
    border-radius: var(--radius-sm);
}

.stat-item.highlight {
    background: linear-gradient(135deg, rgba(var(--primary-rgb), 0.2), rgba(var(--success-rgb), 0.2));
    border: 2px solid var(--color-success);
}

.stat-item label {
    color: var(--color-text-secondary);
}

.stat-item value {
    color: var(--color-text);
    font-weight: 700;
}

.recent-sessions {
    display: grid;
    gap: var(--spacing-sm);
}

.session-entry {
    padding: var(--spacing-md);
    background: var(--color-surface);
    border-radius: var(--radius-sm);
    border-left: 4px solid var(--color-border);
}

.session-date {
    font-size: 0.85em;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
}

.session-details {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.accuracy-gold {
    background: gold;
    color: #1a1a2e;
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    font-weight: 700;
}

.accuracy-silver {
    background: silver;
    color: #1a1a2e;
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    font-weight: 700;
}

.accuracy-bronze {
    background: #cd7f32;
    color: #1a1a2e;
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    font-weight: 700;
}

.session-notes {
    margin-top: var(--spacing-sm);
    font-size: 0.9em;
    color: var(--color-text-secondary);
    font-style: italic;
}

/* Dashboard Grid */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.milestone-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: var(--spacing-md);
}

.milestone-badge {
    text-align: center;
    padding: var(--spacing-md);
    background: var(--color-surface2);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
}

.milestone-badge.unlocked {
    background: linear-gradient(135deg, var(--color-success), var(--color-primary));
    color: var(--color-background);
    box-shadow: 0 4px 12px rgba(var(--success-rgb), 0.3);
}

.milestone-badge.locked {
    opacity: 0.5;
    filter: grayscale(100%);
}

/* Mode Button Highlight */
.mode-btn-highlight {
    border: 3px solid var(--color-primary);
    box-shadow: 0 0 20px rgba(var(--primary-rgb), 0.4);
}

.mode-btn-highlight:hover {
    box-shadow: 0 0 30px rgba(var(--primary-rgb), 0.6);
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .category-nav {
        grid-template-columns: 1fr;
    }

    .bpm-ladder {
        justify-content: flex-start;
    }

    .tempo-display {
        font-size: 3.5em;
    }

    .quality-buttons,
    .accuracy-buttons {
        flex-direction: column;
    }

    .dashboard-grid {
        grid-template-columns: 1fr;
    }
}