/* Modern CSS Reset and Variables */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Modern Color Palette */
    --primary-color: #D2691E;
    --primary-dark: #A0522D;
    --primary-light: #DEB887;
    --secondary-color: #1a73e8;
    --secondary-dark: #1557b0;
    --accent-color: #e91e63;
    --accent-light: #f06292;
    --success-color: #00c853;
    --danger-color: #d32f2f;
    --warning-color: #ff6f00;
    --info-color: #0288d1;
    
    /* Neutral Colors */
    --gray-50: #fafafa;
    --gray-100: #f5f5f5;
    --gray-200: #eeeeee;
    --gray-300: #e0e0e0;
    --gray-400: #bdbdbd;
    --gray-500: #9e9e9e;
    --gray-600: #757575;
    --gray-700: #616161;
    --gray-800: #424242;
    --gray-900: #212121;
    
    /* Layout */
    --border-radius-sm: 8px;
    --border-radius: 16px;
    --border-radius-lg: 24px;
    --border-radius-xl: 32px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Shadows - More subtle and layered */
    --shadow-xs: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.15);
    --shadow-2xl: 0 24px 64px rgba(0, 0, 0, 0.18);
    
    /* Light theme colors */
    --bg-primary: #ffffff;
    --bg-secondary: #fafafa;
    --bg-tertiary: #f5f5f5;
    --bg-card: #ffffff;
    --bg-input: #ffffff;
    --bg-hover: rgba(0, 0, 0, 0.04);
    --bg-active: rgba(0, 0, 0, 0.08);
    --text-primary: #1a1a1a;
    --text-secondary: #666666;
    --text-tertiary: #999999;
    --border-color: rgba(0, 0, 0, 0.08);
    --border-input: rgba(0, 0, 0, 0.12);
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #D2691E 0%, #A0522D 100%);
    --gradient-secondary: linear-gradient(135deg, #1a73e8 0%, #1557b0 100%);
    --gradient-accent: linear-gradient(135deg, #e91e63 0%, #c2185b 100%);
    --gradient-warm: linear-gradient(135deg, #ff6b6b 0%, #ee5a24 50%, #f0932b 100%);
    --gradient-cool: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

/* Dark theme */
[data-theme="dark"] {
    --bg-primary: #0a0a0a;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #252525;
    --bg-card: #1f1f1f;
    --bg-input: #2a2a2a;
    --bg-hover: rgba(255, 255, 255, 0.08);
    --bg-active: rgba(255, 255, 255, 0.12);
    --text-primary: #f5f5f5;
    --text-secondary: #b0b0b0;
    --text-tertiary: #808080;
    --border-color: rgba(255, 255, 255, 0.08);
    --border-input: rgba(255, 255, 255, 0.12);
    --shadow-xs: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
    --shadow: 0 4px 16px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.6);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.7);
    --shadow-2xl: 0 24px 64px rgba(0, 0, 0, 0.8);
}

/* Base Styles */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    transition: background 0.3s ease, color 0.3s ease;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    line-height: 1.2;
    font-weight: 600;
    letter-spacing: -0.02em;
}

/* App Container */
.app-container {
    display: flex;
    min-height: 100vh;
    position: relative;
}

/* History Sidebar - Modernized */
.history-sidebar {
    position: fixed;
    left: -380px;
    top: 0;
    width: 380px;
    height: 100vh;
    background: var(--bg-card);
    box-shadow: var(--shadow-xl);
    transition: left 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    backdrop-filter: blur(10px);
}

.history-sidebar.active {
    left: 0;
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-tertiary);
}

.history-header h3 {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 0;
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
}

.history-header h3 i {
    color: var(--primary-color);
}

.close-history {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    background: transparent;
    border: none;
    font-size: 20px;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.close-history:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.history-controls {
    padding: 20px;
    display: flex;
    gap: 12px;
}

.history-controls input {
    flex: 1;
    padding: 12px 16px;
    border: 1px solid var(--border-input);
    border-radius: var(--border-radius-sm);
    font-size: 14px;
    background: var(--bg-input);
    color: var(--text-primary);
    transition: var(--transition);
}

.history-controls input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(210, 105, 30, 0.1);
}

.clear-history-btn {
    background: transparent;
    color: var(--danger-color);
    border: 1px solid var(--danger-color);
    padding: 12px 20px;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
    white-space: nowrap;
}

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

.history-list {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
}

.history-list::-webkit-scrollbar {
    width: 8px;
}

.history-list::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
}

.history-list::-webkit-scrollbar-thumb {
    background: var(--gray-400);
    border-radius: 4px;
}

.history-list::-webkit-scrollbar-thumb:hover {
    background: var(--gray-500);
}

.history-item {
    background: var(--bg-tertiary);
    border-radius: var(--border-radius);
    padding: 20px;
    margin-bottom: 12px;
    cursor: pointer;
    transition: var(--transition);
    border: 1px solid transparent;
    position: relative;
    overflow: hidden;
}

.history-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    transform: translateX(-100%);
    transition: transform 0.3s ease;
}

.history-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
    border-color: var(--border-color);
}

.history-item:hover::before {
    transform: translateX(0);
}

.history-item-title {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
    font-size: 16px;
}

.history-item-date {
    font-size: 12px;
    color: var(--text-tertiary);
    margin-bottom: 8px;
}

.history-item-preview {
    font-size: 14px;
    color: var(--text-secondary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.history-item-actions {
    display: flex;
    gap: 8px;
    margin-top: 12px;
}

.history-btn {
    background: transparent;
    border: 1px solid var(--border-input);
    padding: 6px 14px;
    border-radius: var(--border-radius-sm);
    font-size: 13px;
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-secondary);
    font-weight: 500;
}

.history-btn:hover {
    background: var(--bg-hover);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.no-history {
    text-align: center;
    color: var(--text-tertiary);
    font-style: italic;
    padding: 60px 20px;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    transition: margin-left 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.main-content.shifted {
    margin-left: 380px;
}

/* App Header - Modernized */
.app-header {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    padding: 16px 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 900;
    transition: all 0.3s ease;
}

.menu-btn {
    width: 48px;
    height: 48px;
    border-radius: var(--border-radius);
    background: transparent;
    border: none;
    font-size: 24px;
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    position: relative;
}

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

.history-count {
    position: absolute;
    top: 8px;
    right: 8px;
    background: var(--accent-color);
    color: white;
    font-size: 11px;
    font-weight: 600;
    padding: 2px 6px;
    border-radius: 10px;
    min-width: 20px;
    text-align: center;
}

.header-content {
    flex: 1;
    display: flex;
    justify-content: center;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 20px;
}

.guitar-icon {
    width: 56px;
    height: 56px;
    background: var(--gradient-primary);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 28px;
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
}

.guitar-icon::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent, rgba(255,255,255,0.1), transparent);
    transform: rotate(45deg);
    animation: shimmer 3s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%) translateY(-100%) rotate(45deg); }
    100% { transform: translateX(100%) translateY(100%) rotate(45deg); }
}

.app-header h1 {
    margin: 0;
    font-size: 28px;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tagline {
    margin: 0;
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 400;
}

/* Theme Toggle & Settings - Modernized */
.theme-toggle,
.settings-btn {
    width: 44px;
    height: 44px;
    border-radius: var(--border-radius);
    background: transparent;
    border: none;
    font-size: 22px;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.theme-toggle:hover,
.settings-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.settings-btn {
    margin-right: 8px;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 48px 24px;
}

/* Hero Section - Modernized */
.hero-section {
    text-align: center;
    margin-bottom: 48px;
    animation: fadeInDown 0.8s ease;
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-title {
    font-size: 3.5em;
    font-weight: 800;
    margin-bottom: 16px;
    background: var(--gradient-warm);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.03em;
}

.hero-subtitle {
    font-size: 1.25em;
    color: var(--text-secondary);
    font-weight: 400;
    max-width: 600px;
    margin: 0 auto;
}

/* Interface Toggle */
.interface-toggle {
    margin-top: 32px;
    text-align: center;
}

.toggle-mode-btn {
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    color: var(--text-primary);
    padding: 12px 32px;
    border-radius: var(--border-radius-xl);
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 10px;
    box-shadow: var(--shadow-sm);
}

.toggle-mode-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
    border-color: var(--primary-color);
}

/* Cards - Modernized */
.form-card, .info-card {
    background: var(--bg-card);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    margin-bottom: 32px;
    overflow: hidden;
    transition: var(--transition);
    animation: fadeInUp 0.8s ease;
    border: 1px solid var(--border-color);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.form-card:hover {
    box-shadow: var(--shadow-lg);
}

.card-header {
    background: var(--gradient-primary);
    color: white;
    padding: 24px 32px;
    display: flex;
    align-items: center;
    gap: 16px;
}

.card-header h3 {
    margin: 0;
    font-size: 1.5em;
    font-weight: 600;
}

.card-header i {
    font-size: 28px;
    opacity: 0.9;
}

/* Modern Details */
.modern-details {
    background: var(--bg-card);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.modern-details summary {
    padding: 24px 32px;
    cursor: pointer;
    list-style: none;
    display: flex;
    align-items: center;
    gap: 16px;
    background: var(--bg-tertiary);
    transition: var(--transition);
    user-select: none;
}

.modern-details summary::-webkit-details-marker {
    display: none;
}

.modern-details summary:hover {
    background: var(--bg-hover);
}

.modern-details summary i {
    color: var(--primary-color);
    font-size: 24px;
}

.modern-details summary span {
    flex: 1;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 18px;
}

.toggle-icon {
    transition: transform 0.3s ease;
    color: var(--text-secondary);
}

.modern-details[open] .toggle-icon {
    transform: rotate(180deg);
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
    padding: 32px;
}

.info-item {
    display: flex;
    gap: 16px;
    padding: 20px;
    background: var(--bg-tertiary);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.info-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.info-item i {
    color: var(--primary-color);
    font-size: 28px;
    flex-shrink: 0;
}

.info-item h4 {
    margin: 0 0 8px;
    color: var(--text-primary);
    font-weight: 600;
}

.info-item p {
    margin: 0;
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: 15px;
}

/* Form Groups - Modernized */
.form-group {
    padding: 32px;
}

.form-group:not(:last-child) {
    border-bottom: 1px solid var(--border-color);
}

.form-group label {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 16px;
}

.form-group label i {
    color: var(--primary-color);
    font-size: 20px;
}

.optional {
    font-weight: 400;
    color: var(--text-tertiary);
    font-size: 14px;
}

/* Input Group */
.input-group {
    display: flex;
    gap: 12px;
}

.input-group input {
    flex: 1;
}

/* Modern Input Styles */
.modern-input,
.modern-select,
.modern-textarea,
input[type="text"],
input[type="password"],
select,
textarea {
    width: 100%;
    padding: 14px 18px;
    border: 2px solid var(--border-input);
    border-radius: var(--border-radius);
    font-size: 16px;
    font-family: inherit;
    transition: var(--transition);
    background: var(--bg-input);
    color: var(--text-primary);
}

.modern-input:focus,
.modern-select:focus,
.modern-textarea:focus,
input[type="text"]:focus,
input[type="password"]:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(210, 105, 30, 0.1);
}

[data-theme="dark"] .modern-input:focus,
[data-theme="dark"] .modern-select:focus,
[data-theme="dark"] .modern-textarea:focus,
[data-theme="dark"] input[type="text"]:focus,
[data-theme="dark"] input[type="password"]:focus,
[data-theme="dark"] select:focus,
[data-theme="dark"] textarea:focus {
    box-shadow: 0 0 0 4px rgba(210, 105, 30, 0.2);
}

select {
    cursor: pointer;
}

select option {
    background: var(--bg-input);
    color: var(--text-primary);
}

.modern-textarea {
    resize: vertical;
    min-height: 140px;
    line-height: 1.6;
}

/* Modern Slider - Enhanced */
.modern-slider-container {
    margin-top: 24px;
}

.slider-wrapper {
    position: relative;
}

.slider-track {
    position: relative;
    height: 48px;
    display: flex;
    align-items: center;
}

#styleSlider, #wizardStyleSlider {
    -webkit-appearance: none;
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--gray-300);
    outline: none;
    position: relative;
    z-index: 2;
}

.slider-fill, #sliderFill, #wizardSliderFill {
    position: absolute;
    height: 6px;
    background: var(--gradient-warm);
    border-radius: 3px;
    pointer-events: none;
    transition: width 0.1s ease;
}

#styleSlider::-webkit-slider-thumb,
#wizardStyleSlider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--bg-card);
    border: 3px solid var(--primary-color);
    cursor: pointer;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

#styleSlider::-webkit-slider-thumb:hover,
#wizardStyleSlider::-webkit-slider-thumb:hover {
    transform: scale(1.15);
    box-shadow: var(--shadow-lg);
}

#styleSlider::-moz-range-thumb,
#wizardStyleSlider::-moz-range-thumb {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--bg-card);
    border: 3px solid var(--primary-color);
    cursor: pointer;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.slider-labels {
    display: flex;
    justify-content: space-between;
    margin-top: 16px;
}

.slider-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--text-secondary);
}

.slider-label i {
    font-size: 18px;
    color: var(--primary-color);
}

.style-badge {
    background: var(--gradient-primary);
    color: white;
    padding: 6px 16px;
    border-radius: 24px;
    font-size: 14px;
    font-weight: 500;
    margin-left: 12px;
    box-shadow: var(--shadow-sm);
}

.style-description {
    background: var(--bg-tertiary);
    padding: 20px;
    border-radius: var(--border-radius);
    margin-top: 20px;
    color: var(--text-primary);
}

.style-description p {
    margin: 0;
    font-size: 15px;
    line-height: 1.6;
}

/* Buttons - Modernized */
.btn-primary,
.btn-secondary,
.btn-generate {
    border: none;
    padding: 14px 28px;
    border-radius: var(--border-radius);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 10px;
    text-transform: none;
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

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

.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.btn-generate {
    background: var(--gradient-warm);
    color: white;
    width: 100%;
    padding: 18px;
    font-size: 18px;
    margin-top: 24px;
    border-radius: var(--border-radius-lg);
}

.btn-generate:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-generate:disabled {
    background: var(--gray-400);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* Pills Container - Enhanced */
.pills-container {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    padding: 20px;
    background: var(--bg-tertiary);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.pill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: 24px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    user-select: none;
    color: var(--text-primary);
}

.pill i {
    font-size: 16px;
    color: var(--primary-color);
}

.pill:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.pill:hover i {
    color: white;
}

.pill:active {
    transform: translateY(0);
}

/* Loading Container - Enhanced */
.loading-container {
    text-align: center;
    padding: 80px 40px;
    background: var(--bg-card);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    margin-top: 40px;
    border: 1px solid var(--border-color);
}

.loading-spinner {
    font-size: 56px;
    color: var(--primary-color);
    margin-bottom: 24px;
    animation: spin 1s linear infinite;
}

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

.loading-container p {
    font-size: 18px;
    color: var(--text-secondary);
    font-weight: 500;
}

/* Song Output - Enhanced */
.song-output {
    background: var(--bg-card);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    margin-top: 40px;
    animation: fadeInUp 0.8s ease;
    border: 1px solid var(--border-color);
}

.song-title {
    font-size: 2.5em;
    font-weight: 700;
    text-align: center;
    padding: 40px 32px;
    background: var(--gradient-warm);
    color: white;
    margin: 0;
    letter-spacing: -0.02em;
}

.song-section {
    padding: 40px;
    border-bottom: 1px solid var(--border-color);
    position: relative;
}

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

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.section-header h3 {
    color: var(--text-primary);
    font-size: 1.5em;
    margin: 0;
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 600;
}

.section-header h3 i {
    color: var(--primary-color);
}

.copy-button {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    padding: 10px 20px;
    border: 1px solid var(--border-input);
    border-radius: var(--border-radius);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
}

.copy-button:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.copy-button.copied {
    background: var(--success-color);
    color: white;
    border-color: var(--success-color);
}

.lyrics {
    white-space: pre-wrap;
    font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Code', monospace;
    background: var(--bg-tertiary);
    padding: 32px;
    border-radius: var(--border-radius);
    line-height: 1.8;
    font-size: 16px;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.suno-style,
.notes {
    background: var(--bg-tertiary);
    padding: 24px;
    border-radius: var(--border-radius);
    line-height: 1.6;
    color: var(--text-primary);
    font-size: 16px;
}

/* Edit Mode Styles - Enhanced */
.editable-section {
    position: relative;
    padding: 20px;
    background: var(--bg-tertiary);
    border-radius: var(--border-radius);
    border: 2px dashed var(--primary-color);
    transition: var(--transition);
}

.edit-button {
    background: transparent;
    border: 1px solid var(--border-input);
    color: var(--text-secondary);
    padding: 10px 20px;
    border-radius: var(--border-radius);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-left: 12px;
}

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

.edit-button i {
    font-size: 14px;
}

.edit-textarea {
    width: 100%;
    padding: 16px;
    border: 2px solid var(--primary-color);
    border-radius: var(--border-radius);
    background: var(--bg-input);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 16px;
    line-height: 1.6;
    resize: vertical;
    min-height: 180px;
    transition: var(--transition);
}

.edit-textarea:focus {
    outline: none;
    box-shadow: 0 0 0 4px rgba(210, 105, 30, 0.2);
}

.edit-actions {
    display: flex;
    gap: 12px;
    margin-top: 16px;
    justify-content: flex-end;
}

.btn-save-edit {
    background: var(--gradient-primary);
    color: white;
    border: none;
    padding: 10px 24px;
    border-radius: var(--border-radius);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-save-edit:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.btn-cancel-edit {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-input);
    padding: 10px 24px;
    border-radius: var(--border-radius);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-cancel-edit:hover {
    background: var(--bg-hover);
    border-color: var(--danger-color);
    color: var(--danger-color);
}

.editing-highlight {
    box-shadow: 0 0 0 4px rgba(210, 105, 30, 0.1);
    background: var(--bg-tertiary);
}

/* Save Buttons - Enhanced */
.save-buttons-container {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    padding: 40px;
    background: var(--bg-tertiary);
}

.save-button {
    flex: 1;
    min-width: 200px;
    padding: 16px 32px;
    border: none;
    border-radius: var(--border-radius);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    color: white;
    box-shadow: var(--shadow-sm);
}

.save-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.save-button-json {
    background: var(--gradient-secondary);
}

.save-button-markdown {
    background: var(--gradient-cool);
}

.save-button-pdf {
    background: var(--gradient-accent);
}

/* Modal Styles - Enhanced */
.modal {
    display: none;
    position: fixed;
    z-index: 3000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    animation: fadeIn 0.3s ease;
}

.modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: var(--bg-card);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-2xl);
    width: 90%;
    max-width: 640px;
    max-height: 85vh;
    overflow: auto;
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from {
        transform: translateY(60px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-header {
    padding: 32px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    margin: 0;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 24px;
    font-weight: 600;
}

.modal-close {
    width: 44px;
    height: 44px;
    border-radius: var(--border-radius);
    background: transparent;
    border: none;
    font-size: 24px;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.modal-close:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.modal-body {
    padding: 32px;
}

.settings-section {
    margin-bottom: 40px;
}

.settings-section h3 {
    color: var(--text-primary);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
}

.api-key-status {
    margin-top: 12px;
    padding: 12px 16px;
    border-radius: var(--border-radius);
    font-size: 14px;
    font-weight: 500;
}

.api-key-status.success {
    background: rgba(0, 200, 83, 0.1);
    color: var(--success-color);
    border: 1px solid var(--success-color);
}

.api-key-status.error {
    background: rgba(211, 47, 47, 0.1);
    color: var(--danger-color);
    border: 1px solid var(--danger-color);
}

/* Interface Mode Selector - Enhanced */
.mode-selector {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-top: 20px;
}

.mode-btn {
    padding: 24px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--bg-tertiary);
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

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

.mode-btn.active {
    border-color: var(--primary-color);
    background: var(--bg-hover);
    box-shadow: var(--shadow-sm);
}

.mode-btn i {
    font-size: 36px;
    color: var(--primary-color);
    display: block;
    margin-bottom: 12px;
}

.mode-btn span {
    display: block;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
    font-size: 16px;
}

.mode-btn small {
    display: block;
    color: var(--text-secondary);
    font-size: 13px;
}

/* Wizard Interface Styles - Enhanced */
.wizard-container {
    animation: fadeIn 0.5s ease;
}

/* Progress Bar - Enhanced */
.wizard-progress {
    margin-bottom: 48px;
    background: var(--bg-card);
    padding: 40px;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.progress-bar {
    height: 8px;
    background: var(--gray-300);
    border-radius: 4px;
    margin-bottom: 40px;
    position: relative;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--gradient-warm);
    border-radius: 4px;
    width: 25%;
    transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.progress-steps {
    display: flex;
    justify-content: space-between;
    position: relative;
}

.step {
    text-align: center;
    position: relative;
    flex: 1;
}

.step-number {
    width: 48px;
    height: 48px;
    background: var(--bg-tertiary);
    border: 3px solid var(--border-input);
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    color: var(--text-tertiary);
    margin-bottom: 12px;
    transition: var(--transition);
    font-size: 18px;
}

.step.active .step-number {
    background: var(--gradient-primary);
    border-color: transparent;
    color: white;
    box-shadow: var(--shadow);
}

.step.completed .step-number {
    background: var(--gradient-secondary);
    border-color: transparent;
    color: white;
}

.step-label {
    font-size: 14px;
    color: var(--text-tertiary);
    font-weight: 500;
}

.step.active .step-label {
    color: var(--text-primary);
    font-weight: 600;
}

/* Wizard Cards - Enhanced */
.wizard-step {
    animation: fadeIn 0.5s ease;
}

.wizard-card {
    background: var(--bg-card);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    padding: 48px;
    border: 1px solid var(--border-color);
}

.wizard-card h3 {
    color: var(--text-primary);
    margin-bottom: 32px;
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 1.75em;
    font-weight: 600;
}

.wizard-hint {
    color: var(--text-secondary);
    margin: -16px 0 24px;
    font-style: italic;
    font-size: 15px;
}

/* Wizard Tabs - Enhanced */
.wizard-tabs {
    display: flex;
    gap: 12px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.tab-btn {
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    color: var(--text-primary);
    padding: 12px 24px;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    font-size: 14px;
    font-weight: 500;
}

.tab-btn:hover {
    border-color: var(--primary-color);
    background: var(--bg-hover);
}

.tab-btn.active {
    background: var(--gradient-primary);
    color: white;
    border-color: transparent;
    box-shadow: var(--shadow-sm);
}

.tab-content {
    margin-bottom: 24px;
}

/* Review Section - Enhanced */
.review-section {
    background: var(--bg-tertiary);
    border-radius: var(--border-radius);
    padding: 32px;
}

.review-content {
    line-height: 1.8;
}

.review-content h4 {
    color: var(--primary-color);
    margin-bottom: 12px;
    font-weight: 600;
}

.review-content p {
    margin-bottom: 16px;
    color: var(--text-primary);
    font-size: 16px;
}

.review-content strong {
    color: var(--text-primary);
    font-weight: 600;
}

/* Wizard Navigation - Enhanced */
.wizard-navigation {
    display: flex;
    justify-content: space-between;
    gap: 24px;
    margin-top: 40px;
}

.wizard-navigation button {
    min-width: 160px;
}

#wizardGenerateBtn {
    flex: 1;
    max-width: 320px;
    margin: 0 auto;
}

/* Notification Styles - Enhanced */
.notification {
    position: fixed;
    top: 24px;
    right: 24px;
    background: var(--bg-card);
    padding: 16px 24px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 12px;
    transform: translateX(400px);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 2000;
    max-width: 360px;
    border: 1px solid var(--border-color);
}

.notification.show {
    transform: translateX(0);
}

.notification-success {
    border-left: 4px solid var(--success-color);
}

.notification-success i {
    color: var(--success-color);
    font-size: 20px;
}

.notification-error {
    border-left: 4px solid var(--danger-color);
}

.notification-error i {
    color: var(--danger-color);
    font-size: 20px;
}

.notification-info {
    border-left: 4px solid var(--info-color);
}

.notification-info i {
    color: var(--info-color);
    font-size: 20px;
}

/* Error Message - Enhanced */
.error {
    background: rgba(211, 47, 47, 0.1);
    color: var(--danger-color);
    padding: 24px;
    border-radius: var(--border-radius);
    margin-top: 24px;
    border: 1px solid var(--danger-color);
    display: flex;
    align-items: center;
    gap: 12px;
}

.error i {
    font-size: 24px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 24px 16px;
    }
    
    .hero-title {
        font-size: 2.5em;
    }
    
    .history-sidebar {
        width: 100%;
        left: -100%;
    }
    
    .main-content.shifted {
        margin-left: 0;
    }
    
    .info-grid {
        grid-template-columns: 1fr;
    }
    
    .input-group {
        flex-direction: column;
    }
    
    .save-buttons-container {
        flex-direction: column;
    }
    
    .save-button {
        width: 100%;
    }
    
    .header-content {
        margin-left: 15px;
    }
    
    .guitar-icon {
        width: 48px;
        height: 48px;
        font-size: 24px;
    }
    
    .app-header h1 {
        font-size: 24px;
    }
    
    .tagline {
        font-size: 13px;
    }
    
    .theme-toggle,
    .settings-btn {
        width: 40px;
        height: 40px;
        font-size: 20px;
    }
    
    .form-group {
        padding: 24px;
    }
    
    .wizard-card {
        padding: 32px 24px;
    }
    
    .progress-steps {
        flex-wrap: wrap;
    }
    
    .step {
        min-width: 50%;
        margin-bottom: 24px;
    }
    
    .mode-selector {
        grid-template-columns: 1fr;
    }
    
    .wizard-tabs {
        justify-content: center;
    }
    
    .wizard-navigation {
        flex-direction: column;
    }
    
    .wizard-navigation button {
        width: 100%;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation: none !important;
        transition: none !important;
    }
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
}

::-webkit-scrollbar-thumb {
    background: var(--gray-400);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--gray-500);
}

/* Focus Visible */
:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Print Styles */
@media print {
    .app-header,
    .history-sidebar,
    .save-buttons-container,
    .copy-button,
    .edit-button,
    .interface-toggle {
        display: none !important;
    }
    
    .main-content {
        margin: 0 !important;
    }
    
    .song-output {
        box-shadow: none !important;
        border: 1px solid #000 !important;
    }
}