/* =============================================
   SOUNDSCORE STUDIO PRO - STYLES v3.0
   Vollständig responsive, Mobile-optimiert
   ============================================= */

/* =============================================
   CSS VARIABLES
   ============================================= */
:root {
    /* Colors - Dark Theme */
    --bg-primary: #0d0d14;
    --bg-secondary: #13131f;
    --bg-tertiary: #1a1a2e;
    --bg-card: #1e1e32;
    --bg-card-hover: #252540;
    --bg-input: #16162a;
    
    /* Text Colors */
    --text-primary: #ffffff;
    --text-secondary: #b4b4c4;
    --text-muted: #6b6b80;
    --text-hint: #4a4a5e;
    
    /* Accent Colors */
    --accent: #6c5ce7;
    --accent-light: #a29bfe;
    --accent-dark: #5541d9;
    --accent-glow: rgba(108, 92, 231, 0.3);
    
    /* Semantic Colors */
    --success: #00d26a;
    --success-bg: rgba(0, 210, 106, 0.1);
    --warning: #ffc107;
    --warning-bg: rgba(255, 193, 7, 0.1);
    --danger: #ff4757;
    --danger-bg: rgba(255, 71, 87, 0.1);
    --info: #00b4d8;
    --info-bg: rgba(0, 180, 216, 0.1);
    
    /* Staff/Sheet Music */
    --staff-line: #444466;
    --staff-bg: #12121e;
    --note-color: #ffffff;
    --note-active: #6c5ce7;
    
    /* UI Elements */
    --border-color: #2a2a44;
    --border-light: #3a3a55;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px var(--accent-glow);
    
    /* Sizing */
    --sidebar-width: 260px;
    --sidebar-collapsed: 70px;
    --topbar-height: 60px;
    --mobile-header-height: 56px;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    --transition-slow: 0.4s ease;
    
    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    /* Font */
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

/* Light Theme */
[data-theme="light"] {
    --bg-primary: #f5f5f8;
    --bg-secondary: #ffffff;
    --bg-tertiary: #eeeef2;
    --bg-card: #ffffff;
    --bg-card-hover: #f8f8fc;
    --bg-input: #f0f0f5;
    --text-primary: #1a1a2e;
    --text-secondary: #4a4a5e;
    --text-muted: #8888a0;
    --border-color: #e0e0e8;
    --border-light: #d0d0d8;
    --staff-line: #aaaacc;
    --staff-bg: #fafafe;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-main);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: var(--border-light);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent);
}

/* Selection */
::selection {
    background: var(--accent);
    color: white;
}

/* =============================================
   START SCREEN
   ============================================= */
.start-screen {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-tertiary) 100%);
    z-index: 9999;
    animation: fadeIn 0.5s ease;
}

.start-content {
    text-align: center;
    padding: 2rem;
    max-width: 500px;
    width: 100%;
}

.logo-animated {
    margin-bottom: 1.5rem;
}

.logo-circle {
    width: 100px;
    height: 100px;
    margin: 0 auto 1rem;
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-glow);
    animation: pulse 2s infinite;
}

.logo-icon {
    font-size: 3rem;
}

.logo-text {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.logo-text span {
    display: block;
    font-size: 1rem;
    font-weight: 400;
    color: var(--accent-light);
    margin-top: 0.25rem;
}

.tagline {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 2rem;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 2rem;
}

.feature-item {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1rem 0.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition-normal);
}

.feature-item:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}

.feature-icon {
    font-size: 1.5rem;
}

.feature-text {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-align: center;
}

.start-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    padding: 1rem 3rem;
    font-size: 1.1rem;
    font-weight: 600;
    color: white;
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: var(--transition-normal);
    box-shadow: var(--shadow-glow);
}

.start-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 0 30px var(--accent-glow);
}

.start-btn:active {
    transform: scale(0.98);
}

.start-hint {
    margin-top: 1.5rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.protocol-warning {
    margin-top: 1rem;
    padding: 1rem;
    background: var(--danger-bg);
    border: 1px solid var(--danger);
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    color: var(--danger);
}

/* =============================================
   APP LAYOUT
   ============================================= */
.app {
    display: flex;
    min-height: 100vh;
}

.app.hidden {
    display: none;
}

/* Mobile Header */
.mobile-header {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--mobile-header-height);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 0 1rem;
    align-items: center;
    justify-content: space-between;
    z-index: 1000;
}

.menu-btn {
    width: 40px;
    height: 40px;
    background: transparent;
    border: none;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
}

.menu-btn span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition-fast);
}

.mobile-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.1rem;
    font-weight: 600;
}

.title-icon {
    font-size: 1.25rem;
}

.stop-btn-mobile {
    width: 40px;
    height: 40px;
    background: var(--danger);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    cursor: pointer;
}

/* =============================================
   SIDEBAR
   ============================================= */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: var(--sidebar-width);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    z-index: 100;
    transition: var(--transition-normal);
}

.sidebar-header {
    padding: 1.25rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.sidebar-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-mini {
    font-size: 1.5rem;
}

.sidebar-logo h2 {
    font-size: 1.1rem;
    font-weight: 700;
}

.sidebar-logo h2 span {
    font-size: 0.7rem;
    font-weight: 400;
    color: var(--accent-light);
    display: block;
}

.close-sidebar {
    display: none;
    width: 32px;
    height: 32px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
}

.nav-scroll {
    flex: 1;
    overflow-y: auto;
    padding: 0.5rem 0;
}

.nav-section {
    padding: 0.5rem 0;
}

.nav-label {
    display: block;
    padding: 0.5rem 1.25rem;
    font-size: 0.65rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    width: 100%;
    padding: 0.7rem 1.25rem;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 0.9rem;
    text-align: left;
    cursor: pointer;
    transition: var(--transition-fast);
    position: relative;
}

.nav-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.nav-btn.active {
    background: var(--accent-glow);
    color: var(--accent-light);
}

.nav-btn.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 60%;
    background: var(--accent);
    border-radius: 0 2px 2px 0;
}

.nav-icon {
    font-size: 1.1rem;
    width: 24px;
    text-align: center;
}

.nav-text {
    flex: 1;
}

.nav-badge {
    font-size: 0.6rem;
    padding: 0.15rem 0.4rem;
    background: var(--accent);
    color: white;
    border-radius: var(--radius-full);
    font-weight: 600;
}

.nav-badge.new {
    background: var(--success);
}

.sidebar-footer {
    padding: 1rem 1.25rem;
    border-top: 1px solid var(--border-color);
}

.mic-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.mic-indicator {
    width: 8px;
    height: 8px;
    background: var(--text-muted);
    border-radius: 50%;
}

.mic-status.active .mic-indicator {
    background: var(--success);
    box-shadow: 0 0 8px var(--success);
    animation: pulse 1.5s infinite;
}

.version-info {
    margin-top: 0.5rem;
    font-size: 0.7rem;
    color: var(--text-hint);
}

/* =============================================
   MAIN CONTENT
   ============================================= */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.topbar {
    position: sticky;
    top: 0;
    height: var(--topbar-height);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    z-index: 50;
}

.topbar-left {
    display: flex;
    align-items: baseline;
    gap: 0.75rem;
}

.page-title {
    font-size: 1.25rem;
    font-weight: 600;
}

.page-subtitle {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.topbar-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.topbar-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 0.85rem;
    cursor: pointer;
    transition: var(--transition-fast);
}

.topbar-btn:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
}

.topbar-btn.mic-btn.active {
    background: var(--success-bg);
    border-color: var(--success);
    color: var(--success);
}

.topbar-btn.stop-btn {
    background: var(--danger);
    border-color: var(--danger);
    color: white;
}

.topbar-btn.stop-btn:hover {
    background: #ff3344;
}

.pages-container {
    flex: 1;
    padding: 1.5rem;
    overflow-y: auto;
}

/* =============================================
   PAGE LAYOUTS
   ============================================= */
.page {
    display: none;
    animation: fadeIn 0.3s ease;
}

.page.active {
    display: block;
}

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

/* =============================================
   CARDS
   ============================================= */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    transition: var(--transition-normal);
}

.card:hover {
    border-color: var(--border-light);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.card-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.card-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.card-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
}

.card.full-width {
    grid-column: 1 / -1;
}

/* =============================================
   DASHBOARD
   ============================================= */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.25rem;
}

.welcome-card {
    grid-column: 1 / -1;
    background: linear-gradient(135deg, var(--bg-card) 0%, var(--bg-tertiary) 100%);
}

.welcome-content h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.welcome-content p {
    color: var(--text-secondary);
}

.quick-actions {
    display: flex;
    gap: 1rem;
    margin-top: 1.25rem;
    flex-wrap: wrap;
}

.quick-action {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition-fast);
}

.quick-action:hover {
    background: var(--accent);
    border-color: var(--accent);
}

.qa-icon {
    font-size: 1.25rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
}

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

.stat-value {
    display: block;
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--accent-light);
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Mini Piano */
.mini-piano {
    display: flex;
    justify-content: center;
    gap: 2px;
    padding: 1rem 0;
}

.mini-key {
    width: 28px;
    height: 80px;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 0 0 4px 4px;
    cursor: pointer;
    transition: var(--transition-fast);
}

.mini-key.black {
    width: 20px;
    height: 50px;
    background: #222;
    margin: 0 -10px;
    z-index: 1;
    border-radius: 0 0 3px 3px;
}

.mini-key:hover {
    background: var(--accent-light);
}

.mini-key.black:hover {
    background: var(--accent);
}

.mini-key:active, .mini-key.active {
    background: var(--accent);
    transform: translateY(2px);
}

/* Features Card */
.features-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.feature-highlight {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.75rem;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

.fh-icon {
    font-size: 1.5rem;
}

.fh-content strong {
    display: block;
    font-size: 0.9rem;
    margin-bottom: 0.25rem;
}

.fh-content p {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* Activity Card */
.activity-list {
    max-height: 200px;
    overflow-y: auto;
}

/* =============================================
   AUDIO TO NOTES (HAUPTMODUL)
   ============================================= */
.a2n-layout {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 1.25rem;
    height: calc(100vh - var(--topbar-height) - 3rem);
}

.a2n-sidebar {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    overflow-y: auto;
}

.a2n-main {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    min-height: 0;
}

/* Mode Tabs */
.mode-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.mode-tab {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition-fast);
}

.mode-tab:hover {
    background: var(--bg-card-hover);
}

.mode-tab.active {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
}

.mode-content {
    display: none;
}

.mode-content.active {
    display: block;
}

/* Live Display */
.live-controls {
    margin-bottom: 1rem;
}

.live-display {
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    padding: 1rem;
    margin-bottom: 1rem;
}

.current-note-display {
    text-align: center;
    margin-bottom: 0.75rem;
}

.big-note {
    font-size: 4rem;
    font-weight: 700;
    color: var(--accent-light);
    line-height: 1;
}

.note-octave {
    font-size: 1.5rem;
    color: var(--text-secondary);
    vertical-align: super;
}

.note-details {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 1rem;
}

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

.detail-label {
    display: block;
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}

.detail-value {
    font-size: 0.9rem;
    font-family: var(--font-mono);
    color: var(--text-secondary);
}

/* Pitch Meter */
.pitch-meter {
    margin-bottom: 1rem;
}

.meter-scale {
    display: flex;
    justify-content: space-between;
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}

.meter-track {
    height: 20px;
    background: var(--bg-input);
    border-radius: var(--radius-full);
    position: relative;
    overflow: hidden;
}

.meter-center {
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--success);
    transform: translateX(-50%);
}

.meter-needle {
    position: absolute;
    left: 50%;
    top: 2px;
    bottom: 2px;
    width: 4px;
    background: var(--accent);
    border-radius: 2px;
    transform: translateX(-50%);
    transition: left 0.1s ease;
}

/* Volume Meter */
.volume-meter {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.vm-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    white-space: nowrap;
}

.vm-track {
    flex: 1;
    height: 8px;
    background: var(--bg-input);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.vm-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--success), var(--warning), var(--danger));
    border-radius: var(--radius-full);
    transition: width 0.1s ease;
}

/* Detection Settings */
.detection-settings {
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.setting-row {
    margin-bottom: 1rem;
}

.setting-row label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.setting-value {
    font-family: var(--font-mono);
    color: var(--accent-light);
}

/* Drop Zone */
.drop-zone {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition-normal);
    margin-bottom: 1rem;
}

.drop-zone:hover, .drop-zone.dragover {
    border-color: var(--accent);
    background: var(--accent-glow);
}

.drop-zone.large {
    padding: 3rem 2rem;
}

.drop-zone.centered {
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

.drop-content {
    pointer-events: none;
}

.drop-icon {
    font-size: 3rem;
    display: block;
    margin-bottom: 0.75rem;
}

.drop-text {
    font-size: 1rem;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.drop-hint {
    font-size: 0.85rem;
    color: var(--text-muted);
    display: block;
}

.drop-formats {
    display: block;
    font-size: 0.75rem;
    color: var(--text-hint);
    margin-top: 0.5rem;
}

/* File Info */
.file-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    margin-bottom: 1rem;
}

.file-info.hidden {
    display: none;
}

.file-details {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.file-icon {
    font-size: 1.5rem;
}

.file-name {
    font-weight: 500;
}

.file-duration {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.remove-btn {
    width: 28px;
    height: 28px;
    background: var(--danger-bg);
    border: none;
    border-radius: var(--radius-sm);
    color: var(--danger);
    font-size: 1.25rem;
    cursor: pointer;
    transition: var(--transition-fast);
}

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

/* Progress */
.progress-container {
    margin: 1rem 0;
}

.progress-container.hidden {
    display: none;
}

.progress-bar {
    height: 8px;
    background: var(--bg-input);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--accent), var(--accent-light));
    border-radius: var(--radius-full);
    transition: width 0.3s ease;
}

.progress-text {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-align: center;
    display: block;
}

/* Action Buttons */
.action-buttons {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.section-title {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.export-buttons {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.5rem;
}

/* Stats Mini */
.stats-mini {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
}

.stat-mini {
    background: var(--bg-tertiary);
    padding: 0.75rem;
    border-radius: var(--radius-md);
    text-align: center;
}

.stat-num {
    display: block;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--accent-light);
    font-family: var(--font-mono);
}

.stat-desc {
    font-size: 0.7rem;
    color: var(--text-muted);
}

/* =============================================
   SHEET MUSIC - UNBEGRENZT WACHSEND
   ============================================= */
.sheet-card {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 300px;
}

.sheet-toolbar {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.zoom-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.tool-btn {
    width: 32px;
    height: 32px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition-fast);
}

.tool-btn:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
}

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

.zoom-display {
    font-size: 0.85rem;
    font-family: var(--font-mono);
    color: var(--text-secondary);
    min-width: 50px;
    text-align: center;
}

.sheet-options {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
    cursor: pointer;
}

.checkbox-label input {
    width: 16px;
    height: 16px;
    accent-color: var(--accent);
}

/* Sheet Container - SCROLLBAR & UNBEGRENZT */
.sheet-container {
    flex: 1;
    overflow: auto;
    background: var(--staff-bg);
    border-radius: var(--radius-md);
    min-height: 200px;
    max-height: 100%;
}

.sheet-content {
    min-width: 100%;
    min-height: 100%;
}

.sheet-svg {
    display: block;
    min-width: 2000px;
    min-height: 200px;
    width: max-content;
    height: auto;
}

.sheet-info-bar {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0;
    font-size: 0.75rem;
    color: var(--text-muted);
    border-top: 1px solid var(--border-color);
    margin-top: 0.75rem;
}

/* Clef */
.clef {
    fill: var(--note-color);
}

/* Notes */
.notes-group .note {
    fill: var(--note-color);
    transition: var(--transition-fast);
}

.notes-group .note:hover {
    fill: var(--accent-light);
}

.notes-group .note.active {
    fill: var(--accent);
}

.notes-group .note-stem {
    stroke: var(--note-color);
    stroke-width: 1.5;
}

.notes-group .note-label {
    fill: var(--text-secondary);
    font-size: 10px;
    font-family: var(--font-main);
}

.notes-group .ledger-line {
    stroke: var(--staff-line);
    stroke-width: 1;
}

/* =============================================
   NOTES LIST - GROSS & SCROLLBAR
   ============================================= */
.notes-list-card {
    min-height: 250px;
    max-height: 400px;
    display: flex;
    flex-direction: column;
}

.list-toolbar {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.select-sm {
    padding: 0.4rem 0.75rem;
    font-size: 0.8rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    cursor: pointer;
}

.notes-list-container {
    flex: 1;
    overflow-y: auto;
    min-height: 150px;
}

/* Grid View */
.notes-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    padding: 0.5rem 0;
}

.notes-list.list-view {
    flex-direction: column;
}

.notes-list.timeline-view {
    flex-wrap: nowrap;
    overflow-x: auto;
}

.notes-list.compact-view {
    gap: 0.25rem;
}

/* Note Item */
.note-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition-fast);
    min-width: 80px;
}

.note-item:hover {
    background: var(--bg-card-hover);
    border-color: var(--accent);
}

.note-item.active {
    background: var(--accent-glow);
    border-color: var(--accent);
}

.note-item .note-name {
    font-weight: 600;
    font-size: 1rem;
    color: var(--accent-light);
}

.note-item .note-octave {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.note-item .note-time {
    font-size: 0.7rem;
    color: var(--text-hint);
    font-family: var(--font-mono);
}

/* List View */
.notes-list.list-view .note-item {
    width: 100%;
    justify-content: space-between;
}

/* Empty State */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    text-align: center;
    width: 100%;
}

.empty-state.small {
    padding: 1rem;
}

.empty-icon {
    font-size: 3rem;
    margin-bottom: 0.75rem;
    opacity: 0.5;
}

.empty-title {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.empty-hint {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* List Footer */
.list-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border-color);
    margin-top: 0.75rem;
}

.list-info {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.list-nav {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-btn-sm {
    width: 28px;
    height: 28px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
}

.nav-btn-sm:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* =============================================
   BUTTONS
   ============================================= */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.6rem 1rem;
    font-size: 0.9rem;
    font-weight: 500;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-fast);
    white-space: nowrap;
}

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

.btn.primary:hover {
    background: var(--accent-dark);
    box-shadow: var(--shadow-glow);
}

.btn.secondary {
    background: var(--bg-tertiary);
    border-color: var(--border-color);
    color: var(--text-secondary);
}

.btn.secondary:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
}

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

.btn.danger:hover {
    background: #ff3344;
}

.btn.large {
    padding: 0.85rem 1.5rem;
    font-size: 1rem;
}

.btn.full {
    width: 100%;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn.hidden {
    display: none;
}

/* =============================================
   FORM ELEMENTS
   ============================================= */
input[type="text"],
input[type="number"],
textarea,
select {
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-main);
    font-size: 0.9rem;
    padding: 0.6rem 0.9rem;
    transition: var(--transition-fast);
}

input:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

textarea {
    resize: vertical;
    min-height: 120px;
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    background: var(--bg-input);
    border-radius: 3px;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition-fast);
}

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

input[type="range"][orient="vertical"] {
    writing-mode: bt-lr;
    -webkit-appearance: slider-vertical;
    width: 6px;
    height: 100px;
}

.select-md {
    padding: 0.5rem 1rem;
    min-width: 120px;
}

/* =============================================
   NOTES TO AUDIO
   ============================================= */
.n2a-layout {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 1.25rem;
}

.notes-textarea {
    width: 100%;
    min-height: 200px;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: 1rem;
}

.n2a-settings {
    display: grid;
    gap: 1rem;
    margin-bottom: 1rem;
}

.setting-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.setting-group label {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.setting-control {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.setting-control input[type="range"] {
    flex: 1;
}

.n2a-buttons {
    display: flex;
    gap: 0.75rem;
}

.examples-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.example-btn {
    padding: 0.6rem 1rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    text-align: left;
    cursor: pointer;
    transition: var(--transition-fast);
}

.example-btn:hover {
    background: var(--accent-glow);
    border-color: var(--accent);
    color: var(--text-primary);
}

/* Quick Piano */
.quick-piano {
    display: flex;
    justify-content: center;
    padding: 0.5rem 0;
}

/* =============================================
   AUDIO SPLIT
   ============================================= */
.split-layout {
    display: grid;
    grid-template-columns: 400px 1fr;
    gap: 1.25rem;
}

.split-options {
    margin: 1rem 0;
}

.option-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.5rem;
}

.option-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 0.75rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-fast);
}

.option-item:hover {
    border-color: var(--accent);
}

.option-item input:checked + .option-icon + .option-text {
    color: var(--accent-light);
}

.option-icon {
    font-size: 1.25rem;
}

.option-text {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.split-results {
    min-height: 300px;
}

/* Stem Track */
.stem-track {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    margin-bottom: 0.75rem;
}

.stem-track .track-icon {
    font-size: 1.5rem;
}

.stem-track .track-name {
    flex: 1;
    font-weight: 500;
}

.stem-track .track-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* =============================================
   EFFECTS
   ============================================= */
.effects-layout {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 1.25rem;
}

.effect-module {
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
    margin-bottom: 1rem;
}

.effect-module:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

.effect-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}

.effect-toggle {
    position: relative;
    width: 40px;
    height: 22px;
}

.effect-toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    inset: 0;
    background: var(--bg-input);
    border-radius: 11px;
    cursor: pointer;
    transition: var(--transition-fast);
}

.toggle-slider::before {
    content: '';
    position: absolute;
    left: 2px;
    top: 2px;
    width: 18px;
    height: 18px;
    background: var(--text-muted);
    border-radius: 50%;
    transition: var(--transition-fast);
}

.effect-toggle input:checked + .toggle-slider {
    background: var(--accent);
}

.effect-toggle input:checked + .toggle-slider::before {
    transform: translateX(18px);
    background: white;
}

.effect-name {
    font-weight: 500;
}

.effect-content {
    padding-left: 52px;
}

.eq-visualizer {
    display: flex;
    justify-content: space-around;
    align-items: flex-end;
    height: 120px;
    padding: 0.5rem;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

.eq-band {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.eq-band input[type="range"] {
    height: 80px;
}

.eq-label {
    font-size: 0.7rem;
    color: var(--text-muted);
}

.eq-value {
    font-size: 0.7rem;
    font-family: var(--font-mono);
    color: var(--accent-light);
}

.param-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.param-row label {
    width: 70px;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.param-row input[type="range"] {
    flex: 1;
}

.param-row span {
    width: 50px;
    font-size: 0.75rem;
    font-family: var(--font-mono);
    color: var(--text-muted);
    text-align: right;
}

/* Effects Canvas */
.effects-canvas {
    width: 100%;
    height: 300px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

.vis-controls {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
    flex-wrap: wrap;
}

.vis-btn {
    padding: 0.5rem 1rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-fast);
}

.vis-btn:hover {
    background: var(--bg-card-hover);
}

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

.presets-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.5rem;
}

.preset-btn {
    padding: 0.6rem 1rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-fast);
}

.preset-btn:hover {
    background: var(--accent-glow);
    border-color: var(--accent);
    color: var(--text-primary);
}

/* =============================================
   RECORDER
   ============================================= */
.recorder-layout {
    display: grid;
    grid-template-columns: 1fr 350px;
    gap: 1.25rem;
}

.recorder-card {
    text-align: center;
}

.rec-display {
    margin-bottom: 1.5rem;
}

.rec-waveform {
    width: 100%;
    height: 150px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    margin-bottom: 1rem;
}

.rec-time-display {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.rec-time {
    font-size: 3rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: var(--accent-light);
}

.rec-status {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.rec-controls {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.rec-btn {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    border: 2px solid transparent;
    background: var(--bg-tertiary);
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.25rem;
}

.rec-btn .rec-icon {
    font-size: 1.5rem;
}

.rec-btn .rec-label {
    font-size: 0.65rem;
    color: var(--text-muted);
}

.rec-btn.record {
    background: var(--danger-bg);
    border-color: var(--danger);
    color: var(--danger);
}

.rec-btn.record:hover {
    background: var(--danger);
    color: white;
}

.rec-btn.record.recording {
    animation: pulse 1s infinite;
}

.rec-btn:hover {
    transform: scale(1.05);
}

.rec-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.rec-settings {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.recordings-list {
    max-height: 400px;
    overflow-y: auto;
}

.recording-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    margin-bottom: 0.5rem;
}

.recording-item .rec-play {
    width: 36px;
    height: 36px;
    background: var(--accent);
    border: none;
    border-radius: 50%;
    color: white;
    cursor: pointer;
}

.recording-item .rec-info {
    flex: 1;
}

.recording-item .rec-name {
    font-weight: 500;
    font-size: 0.9rem;
}

.recording-item .rec-duration {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.recording-item .rec-actions {
    display: flex;
    gap: 0.25rem;
}

/* =============================================
   LOOP STATION
   ============================================= */
.looper-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.loop-track {
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1rem;
    transition: var(--transition-fast);
}

.loop-track.recording {
    border-color: var(--danger);
    animation: pulse 1s infinite;
}

.loop-track.playing {
    border-color: var(--success);
}

.track-num {
    display: block;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.track-waveform {
    height: 60px;
    background: var(--bg-input);
    border-radius: var(--radius-sm);
    margin-bottom: 0.75rem;
}

.track-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.track-controls button {
    width: 32px;
    height: 32px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-fast);
}

.track-controls button:hover {
    background: var(--accent);
    color: white;
}

.track-controls .track-rec:hover {
    background: var(--danger);
}

.track-vol {
    flex: 1;
}

.looper-controls {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

/* =============================================
   PIANO
   ============================================= */
.piano-layout {
    max-width: 100%;
}

.piano-card {
    overflow: hidden;
}

.piano-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.piano-settings {
    display: flex;
    gap: 0.75rem;
}

.piano-info {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--accent-light);
}

.piano-container {
    overflow-x: auto;
    padding: 1rem 0;
}

.piano-keyboard {
    display: flex;
    justify-content: center;
    min-width: max-content;
    padding: 0 1rem;
}

.piano-key {
    position: relative;
    cursor: pointer;
    transition: var(--transition-fast);
}

.piano-key.white {
    width: 40px;
    height: 150px;
    background: linear-gradient(180deg, #f8f8f8 0%, #e8e8e8 100%);
    border: 1px solid #ccc;
    border-radius: 0 0 5px 5px;
    z-index: 1;
}

.piano-key.black {
    width: 28px;
    height: 95px;
    background: linear-gradient(180deg, #333 0%, #111 100%);
    border-radius: 0 0 4px 4px;
    margin: 0 -14px;
    z-index: 2;
}

.piano-key.white:hover {
    background: linear-gradient(180deg, #fff 0%, #f0f0f0 100%);
}

.piano-key.black:hover {
    background: linear-gradient(180deg, #444 0%, #222 100%);
}

.piano-key.active,
.piano-key.white:active {
    background: var(--accent-light);
}

.piano-key.black.active,
.piano-key.black:active {
    background: var(--accent);
}

.piano-key .key-label {
    position: absolute;
    bottom: 8px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.7rem;
    color: #888;
    pointer-events: none;
}

.piano-key.black .key-label {
    color: #666;
}

.piano-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 1rem;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.keyboard-hint {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.sustain-pedal {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* =============================================
   DRUMS
   ============================================= */
.drums-layout {
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: 1.25rem;
}

.drums-main {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.drum-pads {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.75rem;
}

.drum-pad {
    aspect-ratio: 1;
    background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-card) 100%);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-fast);
}

.drum-pad:hover {
    border-color: var(--accent);
    background: var(--accent-glow);
}

.drum-pad:active,
.drum-pad.active {
    background: var(--accent);
    color: white;
    transform: scale(0.95);
}

.sequencer-card {
    overflow-x: auto;
}

.drum-sequencer {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    min-width: max-content;
    margin-bottom: 1rem;
}

.seq-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.seq-label {
    width: 60px;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.seq-steps {
    display: flex;
    gap: 3px;
}

.seq-step {
    width: 32px;
    height: 32px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition-fast);
}

.seq-step:nth-child(4n+1) {
    border-color: var(--border-light);
}

.seq-step:hover {
    background: var(--bg-card-hover);
}

.seq-step.active {
    background: var(--accent);
    border-color: var(--accent);
}

.seq-step.playing {
    box-shadow: 0 0 10px var(--accent);
}

.sequencer-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.tempo-control {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.tempo-control input {
    width: 70px;
    text-align: center;
}

.kit-list,
.pattern-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.kit-btn,
.pattern-btn {
    padding: 0.6rem 1rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-fast);
    text-align: left;
}

.kit-btn:hover,
.pattern-btn:hover {
    background: var(--bg-card-hover);
}

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

/* =============================================
   SYNTHESIZER
   ============================================= */
.synth-layout {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 1.25rem;
}

.synth-section {
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
    margin-bottom: 1rem;
}

.synth-section:last-child {
    border-bottom: none;
}

.synth-section h5 {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.osc-controls {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.osc-group {
    background: var(--bg-tertiary);
    padding: 1rem;
    border-radius: var(--radius-md);
}

.osc-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.osc-group select {
    width: 100%;
    margin-bottom: 0.5rem;
}

.detune-control {
    margin-top: 0.5rem;
}

.detune-control label {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.adsr-controls {
    display: flex;
    justify-content: space-around;
    padding: 1rem;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

.adsr-knob {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.adsr-knob input {
    height: 100px;
}

.adsr-knob label {
    font-size: 1rem;
    font-weight: 600;
    color: var(--accent-light);
}

.adsr-knob .knob-value {
    font-size: 0.7rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
}

.filter-controls {
    background: var(--bg-tertiary);
    padding: 1rem;
    border-radius: var(--radius-md);
}

.filter-param {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.filter-param label {
    width: 80px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.filter-param input,
.filter-param select {
    flex: 1;
}

.filter-param span {
    width: 80px;
    font-size: 0.75rem;
    font-family: var(--font-mono);
    color: var(--text-muted);
}

.synth-keyboard {
    display: flex;
    justify-content: center;
    padding: 0.5rem;
}

.synth-presets {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.5rem;
}

/* =============================================
   TUNER
   ============================================= */
.tuner-layout {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 1.25rem;
}

.tuner-card {
    text-align: center;
    padding: 2rem;
}

.tuner-display {
    margin-bottom: 2rem;
}

.tuner-note-display {
    margin-bottom: 0.5rem;
}

.tuner-note {
    font-size: 6rem;
    font-weight: 700;
    color: var(--accent-light);
    line-height: 1;
}

.tuner-octave {
    font-size: 2rem;
    color: var(--text-secondary);
    vertical-align: super;
}

.tuner-freq {
    font-size: 1.25rem;
    font-family: var(--font-mono);
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.tuner-meter {
    max-width: 400px;
    margin: 0 auto 1rem;
}

.tuner-meter .meter-zones {
    display: flex;
    height: 100%;
}

.tuner-meter .zone {
    flex: 1;
}

.tuner-meter .zone.flat {
    background: linear-gradient(90deg, var(--danger), transparent);
    border-radius: 10px 0 0 10px;
}

.tuner-meter .zone.tune {
    background: var(--success);
}

.tuner-meter .zone.sharp {
    background: linear-gradient(90deg, transparent, var(--danger));
    border-radius: 0 10px 10px 0;
}

.tuner-needle {
    position: absolute;
    left: 50%;
    top: -5px;
    bottom: -5px;
    width: 4px;
    background: white;
    border-radius: 2px;
    box-shadow: 0 0 10px rgba(255,255,255,0.5);
    transform: translateX(-50%);
    transition: left 0.1s ease;
}

.tuner-cents {
    font-size: 1.5rem;
    font-family: var(--font-mono);
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.tuner-feedback {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: 1rem;
}

.tuner-feedback.in-tune .feedback-text {
    color: var(--success);
}

.tuner-feedback.flat .feedback-text {
    color: var(--warning);
}

.tuner-feedback.sharp .feedback-text {
    color: var(--danger);
}

.tuner-controls {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

.ref-tones {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
}

.ref-tone {
    padding: 0.6rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-fast);
    text-align: center;
}

.ref-tone:hover {
    background: var(--accent-glow);
    border-color: var(--accent);
}

/* =============================================
   METRONOME
   ============================================= */
.metronome-layout {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 1.25rem;
}

.metronome-card {
    text-align: center;
    padding: 2rem;
}

.bpm-display {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.bpm-btn {
    width: 50px;
    height: 50px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
}

.bpm-btn.large {
    width: 60px;
}

.bpm-btn:hover {
    background: var(--accent);
    color: white;
}

.bpm-input {
    width: 120px;
    height: 80px;
    font-size: 3rem;
    font-weight: 700;
    font-family: var(--font-mono);
    text-align: center;
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    color: var(--accent-light);
}

.bpm-slider {
    width: 100%;
    max-width: 400px;
    margin: 0 auto 2rem;
}

.beat-indicators {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
}

.beat-dot {
    width: 30px;
    height: 30px;
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    border-radius: 50%;
    transition: var(--transition-fast);
}

.beat-dot.accent {
    border-color: var(--accent);
}

.beat-dot.active {
    background: var(--accent);
    box-shadow: 0 0 15px var(--accent);
}

.beat-dot.accent.active {
    background: var(--accent-light);
}

.metro-controls {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

.tap-bpm {
    font-size: 2rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: var(--accent-light);
    margin-top: 1rem;
}

/* =============================================
   CHORDS & SCALES
   ============================================= */
.chords-layout,
.scales-layout {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 1.25rem;
}

.chord-selector,
.scale-selector {
    margin-bottom: 1.5rem;
}

.chord-roots,
.chord-types {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.chord-root-btn,
.chord-type-btn {
    padding: 0.5rem 0.75rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-fast);
}

.chord-root-btn:hover,
.chord-type-btn:hover {
    background: var(--bg-card-hover);
}

.chord-root-btn.active,
.chord-type-btn.active {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
}

.chord-display,
.scale-display {
    text-align: center;
    padding: 1.5rem;
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    margin-bottom: 1rem;
}

.chord-name,
.scale-name {
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-light);
    margin-bottom: 0.5rem;
}

.chord-notes,
.scale-notes {
    font-size: 1.25rem;
    color: var(--text-secondary);
    font-family: var(--font-mono);
    margin-bottom: 1rem;
}

.scale-intervals {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.chord-piano,
.scale-piano {
    display: flex;
    justify-content: center;
    margin-top: 1rem;
}

.chord-actions,
.scale-actions {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
}

.chord-diagram {
    padding: 1rem;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    min-height: 200px;
}

/* =============================================
   CIRCLE OF FIFTHS
   ============================================= */
.circle-layout {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 1.25rem;
}

.circle-svg {
    width: 100%;
    max-width: 400px;
    margin: 0 auto;
    display: block;
}

.circle-key {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--accent-light);
    margin-bottom: 1rem;
}

.info-grid {
    display: grid;
    gap: 0.75rem;
}

.info-item {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.info-label {
    color: var(--text-muted);
}

.info-value {
    font-weight: 500;
    color: var(--text-primary);
}

/* =============================================
   INTERVALS & EAR TRAINING
   ============================================= */
.intervals-layout,
.eartraining-layout {
    max-width: 800px;
    margin: 0 auto;
}

.interval-score {
    font-size: 1.5rem;
    text-align: center;
    margin-bottom: 1.5rem;
    font-family: var(--font-mono);
}

.interval-controls {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.interval-options,
.ear-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.interval-option,
.ear-option {
    padding: 1rem;
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    text-align: center;
    cursor: pointer;
    transition: var(--transition-fast);
}

.interval-option:hover,
.ear-option:hover {
    border-color: var(--accent);
}

.interval-option.correct {
    border-color: var(--success);
    background: var(--success-bg);
}

.interval-option.wrong {
    border-color: var(--danger);
    background: var(--danger-bg);
}

.interval-feedback {
    text-align: center;
    padding: 1rem;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

.interval-feedback.hidden {
    display: none;
}

.interval-reference {
    display: grid;
    gap: 0.5rem;
}

.training-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.training-tab {
    padding: 0.6rem 1rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-fast);
}

.training-tab:hover {
    background: var(--bg-card-hover);
}

.training-tab.active {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
}

.training-area {
    text-align: center;
}

.training-score {
    font-size: 2rem;
    font-family: var(--font-mono);
    margin-bottom: 1.5rem;
}

/* =============================================
   PROGRESSIONS
   ============================================= */
.prog-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.progressions-list {
    display: grid;
    gap: 0.75rem;
}

.progression-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-fast);
}

.progression-item:hover {
    background: var(--bg-card-hover);
}

.prog-name {
    font-weight: 500;
    min-width: 150px;
}

.prog-chords {
    flex: 1;
    font-family: var(--font-mono);
    color: var(--accent-light);
}

.prog-play {
    padding: 0.5rem 1rem;
    background: var(--accent);
    border: none;
    border-radius: var(--radius-md);
    color: white;
    cursor: pointer;
}

/* =============================================
   TRANSPOSE
   ============================================= */
.transpose-layout {
    max-width: 600px;
    margin: 0 auto;
}

.transpose-input {
    width: 100%;
    min-height: 150px;
    margin-bottom: 1rem;
    font-family: var(--font-mono);
}

.transpose-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.trans-btn {
    padding: 0.5rem 0.75rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-fast);
}

.trans-btn:hover {
    background: var(--accent);
    color: white;
}

.transpose-amount {
    font-size: 1.5rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: var(--accent-light);
    min-width: 50px;
    text-align: center;
}

.transpose-result {
    padding: 1rem;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

.transpose-result label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.transpose-output {
    font-size: 1.25rem;
    font-family: var(--font-mono);
    color: var(--accent-light);
    min-height: 30px;
}

/* =============================================
   MIXER
   ============================================= */
.mixer-card {
    overflow-x: auto;
}

.mixer-channels {
    display: flex;
    gap: 1rem;
    min-width: max-content;
    padding: 1rem 0;
}

.mixer-channel {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    min-width: 80px;
}

.mixer-channel.master {
    background: linear-gradient(180deg, var(--accent-glow), var(--bg-tertiary));
}

.channel-label {
    font-size: 0.8rem;
    font-weight: 500;
}

.channel-meter {
    width: 20px;
    height: 150px;
    background: var(--bg-input);
    border-radius: 3px;
    overflow: hidden;
    position: relative;
}

.channel-meter .meter-fill {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 50%;
    background: linear-gradient(0deg, var(--success), var(--warning), var(--danger));
}

.channel-fader {
    height: 150px;
}

.channel-value {
    font-size: 0.75rem;
    font-family: var(--font-mono);
    color: var(--text-muted);
}

.channel-mute,
.channel-solo {
    width: 32px;
    height: 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    font-size: 0.7rem;
    font-weight: 600;
    cursor: pointer;
}

.channel-mute.active {
    background: var(--danger);
    color: white;
}

.channel-solo.active {
    background: var(--warning);
    color: var(--bg-primary);
}

/* =============================================
   PROJECTS
   ============================================= */
.projects-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.projects-list {
    display: grid;
    gap: 0.75rem;
}

.project-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-fast);
}

.project-item:hover {
    background: var(--bg-card-hover);
}

.project-icon {
    font-size: 1.5rem;
}

.project-info {
    flex: 1;
}

.project-name {
    font-weight: 500;
}

.project-date {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* =============================================
   SETTINGS
   ============================================= */
.settings-layout {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.25rem;
}

.settings-group {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.settings-group .setting-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.settings-group .setting-row label {
    color: var(--text-secondary);
}

/* Switch */
.switch {
    position: relative;
    width: 50px;
    height: 26px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.switch .slider {
    position: absolute;
    inset: 0;
    background: var(--bg-input);
    border-radius: 13px;
    cursor: pointer;
    transition: var(--transition-fast);
}

.switch .slider::before {
    content: '';
    position: absolute;
    left: 2px;
    top: 2px;
    width: 22px;
    height: 22px;
    background: var(--text-muted);
    border-radius: 50%;
    transition: var(--transition-fast);
}

.switch input:checked + .slider {
    background: var(--accent);
}

.switch input:checked + .slider::before {
    transform: translateX(24px);
    background: white;
}

.app-info {
    text-align: center;
    color: var(--text-secondary);
}

.app-info p {
    margin-bottom: 0.25rem;
}

.copyright {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
}

/* =============================================
   GUITAR & BASS FRETBOARD
   ============================================= */
.guitar-fretboard,
.bass-fretboard {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 1rem;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    overflow-x: auto;
}

.fret-string {
    display: flex;
    align-items: center;
    gap: 2px;
}

.fret {
    width: 50px;
    height: 30px;
    background: linear-gradient(180deg, #8b7355, #654321);
    border-right: 3px solid #c0c0c0;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-fast);
}

.fret:first-child {
    background: #222;
    width: 30px;
}

.fret:hover {
    background: var(--accent-glow);
}

.fret.active {
    background: var(--accent);
}

.fret-marker {
    width: 8px;
    height: 8px;
    background: #ddd;
    border-radius: 50%;
}

.guitar-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-top: 1rem;
}

/* =============================================
   TOAST NOTIFICATIONS
   ============================================= */
.toast-container {
    position: fixed;
    bottom: 20px;
    right: 20px;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    z-index: 9999;
}

.toast {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 1.25rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    animation: slideIn 0.3s ease;
    max-width: 350px;
}

.toast.success {
    border-color: var(--success);
    background: var(--success-bg);
}

.toast.error {
    border-color: var(--danger);
    background: var(--danger-bg);
}

.toast.warning {
    border-color: var(--warning);
    background: var(--warning-bg);
}

.toast-icon {
    font-size: 1.25rem;
}

.toast-message {
    flex: 1;
    font-size: 0.9rem;
}

.toast-close {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1.25rem;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* =============================================
   MODAL
   ============================================= */
.modal-container {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.modal-container.hidden {
    display: none;
}

.modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
}

.modal-content {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow: hidden;
    animation: modalIn 0.3s ease;
}

@keyframes modalIn {
    from {
        transform: scale(0.9);
        opacity: 0;
    }
    to {
        transform: scale(1);
        opacity: 1;
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    font-size: 1.1rem;
}

.modal-close {
    width: 32px;
    height: 32px;
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
}

.modal-body {
    padding: 1.25rem;
    overflow-y: auto;
    max-height: 60vh;
}

.modal-footer {
    padding: 1rem 1.25rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
}

/* =============================================
   PRINT STYLES
   ============================================= */
.print-area {
    display: none;
}

@media print {
    body * {
        visibility: hidden;
    }
    
    .print-area,
    .print-area * {
        visibility: visible;
    }
    
    .print-area {
        display: block;
        position: absolute;
        left: 0;
        top: 0;
        width: 100%;
        background: white;
        color: black;
        padding: 20mm;
    }
    
    .print-header {
        text-align: center;
        margin-bottom: 20px;
        border-bottom: 2px solid #333;
        padding-bottom: 10px;
    }
    
    .print-title {
        font-size: 24pt;
        font-weight: bold;
    }
    
    .print-subtitle {
        font-size: 12pt;
        color: #666;
    }
    
    .print-notes {
        columns: 2;
        column-gap: 20px;
    }
    
    .print-note {
        display: inline-block;
        padding: 5px 10px;
        margin: 2px;
        border: 1px solid #ccc;
        border-radius: 4px;
        font-family: monospace;
    }
    
    .print-staff {
        margin: 20px 0;
    }
    
    .print-footer {
        margin-top: 20px;
        text-align: center;
        font-size: 10pt;
        color: #666;
    }
}

/* =============================================
   ANIMATIONS
   ============================================= */
@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.05);
        opacity: 0.8;
    }
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

/* Loading Spinner */
.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

/* =============================================
   RESPONSIVE - TABLET
   ============================================= */
@media (max-width: 1024px) {
    .a2n-layout {
        grid-template-columns: 300px 1fr;
    }
    
    .split-layout,
    .effects-layout,
    .n2a-layout,
    .synth-layout {
        grid-template-columns: 1fr;
    }
    
    .recorder-layout,
    .tuner-layout,
    .metronome-layout,
    .chords-layout,
    .scales-layout,
    .circle-layout {
        grid-template-columns: 1fr;
    }
    
    .drums-layout {
        grid-template-columns: 1fr;
    }
    
    .drum-pads {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* =============================================
   RESPONSIVE - MOBILE
   ============================================= */
@media (max-width: 768px) {
    :root {
        --sidebar-width: 280px;
    }
    
    /* Mobile Header */
    .mobile-header {
        display: flex;
    }
    
    /* Sidebar */
    .sidebar {
        transform: translateX(-100%);
        box-shadow: var(--shadow-lg);
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .close-sidebar {
        display: block;
    }
    
    /* Main Content */
    .main-content {
        margin-left: 0;
        padding-top: var(--mobile-header-height);
    }
    
    .topbar {
        display: none;
    }
    
    .pages-container {
        padding: 1rem;
    }
    
    /* Layouts */
    .a2n-layout {
        grid-template-columns: 1fr;
        height: auto;
    }
    
    .a2n-sidebar {
        order: -1;
    }
    
    /* Dashboard */
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .feature-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    /* Notes List */
    .notes-list-card {
        max-height: 300px;
    }
    
    /* Piano */
    .piano-key.white {
        width: 30px;
        height: 120px;
    }
    
    .piano-key.black {
        width: 22px;
        height: 75px;
        margin: 0 -11px;
    }
    
    /* Drums */
    .drum-pads {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .drum-pad {
        font-size: 0.75rem;
    }
    
    /* Buttons */
    .btn.large {
        padding: 0.75rem 1rem;
    }
    
    /* Modal */
    .modal-content {
        width: 95%;
        margin: 1rem;
    }
    
    /* Toast */
    .toast-container {
        left: 10px;
        right: 10px;
        bottom: 10px;
    }
    
    .toast {
        max-width: none;
    }
    
    /* Quick Actions */
    .quick-actions {
        flex-direction: column;
    }
    
    .quick-action {
        width: 100%;
        justify-content: flex-start;
    }
    
    /* Mode Tabs */
    .mode-tabs {
        flex-direction: column;
    }
    
    /* Export Buttons */
    .export-buttons {
        grid-template-columns: 1fr;
    }
    
    /* Action Buttons */
    .action-buttons {
        grid-template-columns: 1fr;
    }
    
    /* Settings */
    .settings-layout {
        grid-template-columns: 1fr;
    }
    
    /* Sheet Toolbar */
    .sheet-toolbar {
        flex-direction: column;
        align-items: flex-start;
    }
    
    /* Mixer */
    .mixer-channels {
        gap: 0.5rem;
    }
    
    .mixer-channel {
        min-width: 60px;
        padding: 0.75rem;
    }
    
    .channel-fader {
        height: 100px;
    }
    
    /* BPM */
    .bpm-display {
        flex-wrap: wrap;
    }
    
    .bpm-input {
        width: 100px;
        height: 60px;
        font-size: 2rem;
    }
}

/* =============================================
   RESPONSIVE - SMALL MOBILE
   ============================================= */
@media (max-width: 480px) {
    .feature-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .stats-mini {
        grid-template-columns: 1fr 1fr;
    }
    
    .option-grid {
        grid-template-columns: 1fr;
    }
    
    .piano-keyboard {
        transform: scale(0.8);
        transform-origin: center;
    }
    
    .drum-pads {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .interval-options,
    .ear-options {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .big-note {
        font-size: 3rem;
    }
    
    .tuner-note {
        font-size: 4rem;
    }
}

/* =============================================
   ACCESSIBILITY
   ============================================= */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus Styles */
:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* Skip Link */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    padding: 8px 16px;
    background: var(--accent);
    color: white;
    z-index: 10000;
    transition: top 0.3s;
}

.skip-link:focus {
    top: 0;
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --border-color: #666;
        --text-secondary: #ccc;
    }
}

/* =============================================
   UTILITY CLASSES
   ============================================= */
.hidden {
    display: none !important;
}

.invisible {
    visibility: hidden;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

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

.text-muted {
    color: var(--text-muted);
}

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }

.p-0 { padding: 0; }
.p-1 { padding: 0.5rem; }
.p-2 { padding: 1rem; }
.p-3 { padding: 1.5rem; }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }
.gap-3 { gap: 1.5rem; }

.w-full { width: 100%; }
.h-full { height: 100%; }