/* ============================================
   AI STUDIO - Design System & Styles
   Modern Glassmorphism UI with Dark/Light Theme
   ============================================ */

/* ===== CSS Variables / Theme Tokens ===== */
:root {
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.2);
    --shadow-glow: 0 0 40px rgba(139, 92, 246, 0.3);
}

/* Dark Theme (Default) */
[data-theme="dark"] {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-tertiary: #1a1a25;
    --bg-glass: rgba(255, 255, 255, 0.03);
    --bg-glass-hover: rgba(255, 255, 255, 0.06);
    --border-glass: rgba(255, 255, 255, 0.08);
    --border-glass-hover: rgba(255, 255, 255, 0.15);

    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-tertiary: rgba(255, 255, 255, 0.5);
    --text-muted: rgba(255, 255, 255, 0.3);

    --accent-primary: #8b5cf6;
    --accent-secondary: #6366f1;
    --accent-gradient: linear-gradient(135deg, #8b5cf6 0%, #6366f1 50%, #3b82f6 100%);
    --accent-glow: rgba(139, 92, 246, 0.4);

    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;

    --input-bg: rgba(255, 255, 255, 0.05);
    --input-border: rgba(255, 255, 255, 0.1);
    --input-focus: rgba(139, 92, 246, 0.5);
}

/* Light Theme */
[data-theme="light"] {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;
    --bg-glass: rgba(255, 255, 255, 0.7);
    --bg-glass-hover: rgba(255, 255, 255, 0.85);
    --border-glass: rgba(0, 0, 0, 0.08);
    --border-glass-hover: rgba(0, 0, 0, 0.15);

    --text-primary: #0f172a;
    --text-secondary: rgba(15, 23, 42, 0.7);
    --text-tertiary: rgba(15, 23, 42, 0.5);
    --text-muted: rgba(15, 23, 42, 0.3);

    --accent-primary: #7c3aed;
    --accent-secondary: #4f46e5;
    --accent-gradient: linear-gradient(135deg, #7c3aed 0%, #4f46e5 50%, #2563eb 100%);
    --accent-glow: rgba(124, 58, 237, 0.3);

    --success: #059669;
    --warning: #d97706;
    --error: #dc2626;

    --input-bg: rgba(0, 0, 0, 0.03);
    --input-border: rgba(0, 0, 0, 0.1);
    --input-focus: rgba(124, 58, 237, 0.5);
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    transition: background-color var(--transition-slow), color var(--transition-slow);
}

/* ===== Animated Background ===== */
.bg-gradient {
    position: fixed;
    inset: 0;
    z-index: -2;
    background: var(--bg-primary);
    overflow: hidden;
}

.bg-gradient::before,
.bg-gradient::after {
    content: '';
    position: absolute;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.4;
    animation: float 20s ease-in-out infinite;
}

.bg-gradient::before {
    background: var(--accent-primary);
    top: -200px;
    right: -100px;
}

.bg-gradient::after {
    background: var(--accent-secondary);
    bottom: -200px;
    left: -100px;
    animation-delay: -10s;
}

[data-theme="light"] .bg-gradient::before,
[data-theme="light"] .bg-gradient::after {
    opacity: 0.15;
}

@keyframes float {

    0%,
    100% {
        transform: translate(0, 0) scale(1);
    }

    25% {
        transform: translate(50px, 50px) scale(1.1);
    }

    50% {
        transform: translate(0, 100px) scale(1);
    }

    75% {
        transform: translate(-50px, 50px) scale(0.95);
    }
}

.bg-noise {
    position: fixed;
    inset: 0;
    z-index: -1;
    opacity: 0.03;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
    pointer-events: none;
}

/* ===== App Container ===== */
.app-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-lg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ===== Header ===== */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-xl);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: var(--accent-gradient);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.logo-icon svg {
    width: 24px;
    height: 24px;
}

.logo-content {
    display: flex;
    flex-direction: column;
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

.logo-subtitle {
    font-size: 0.7rem;
    color: var(--text-muted);
    font-weight: 400;
    letter-spacing: 0.02em;
}

/* App Footer */
.app-footer {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md);
    margin-top: -170px;
    color: var(--text-muted);
    font-size: 0.9rem;
    text-align: center;
}

.rtx-logo {
    height: 40px;
    width: auto;
    margin-top: var(--spacing-sm);
    opacity: 0.8;
    transition: opacity var(--transition-base);
}

.rtx-logo:hover {
    opacity: 1;
}

/* Navigation Tabs */
.nav-tabs {
    display: flex;
    gap: var(--spacing-xs);
    background: var(--input-bg);
    padding: var(--spacing-xs);
    border-radius: var(--radius-lg);
}

.nav-tab {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
}

.nav-tab svg {
    width: 18px;
    height: 18px;
}

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

.nav-tab.active {
    background: var(--accent-gradient);
    color: white;
    box-shadow: var(--shadow-glow);
}

/* Header Actions */
.header-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.btn-icon {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--input-bg);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-base);
}

.btn-icon svg {
    width: 20px;
    height: 20px;
}

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

/* Theme Toggle */
#themeToggle .sun-icon {
    display: none;
}

#themeToggle .moon-icon {
    display: block;
}

[data-theme="light"] #themeToggle .sun-icon {
    display: block;
}

[data-theme="light"] #themeToggle .moon-icon {
    display: none;
}

/* ===== Main Content ===== */
.main-content {
    flex: 1;
}

.tab-content {
    display: none;
    animation: fadeIn 0.3s ease;
}

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

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Generator Layout */
.generator-layout {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: var(--spacing-xl);
}

.music-layout {
    grid-template-columns: 1fr 1fr;
}

/* ===== Glass Card ===== */
.glass-card {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    transition: all var(--transition-base);
}

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

/* Panel Title */
.panel-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xl);
    color: var(--text-primary);
}

.panel-title svg {
    width: 24px;
    height: 24px;
    color: var(--accent-primary);
}

.powered-by {
    font-size: 0.8rem;
    color: var(--text-tertiary);
    margin-top: calc(var(--spacing-xl) * -1 + var(--spacing-xs));
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

/* ===== Form Elements ===== */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.form-group label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.form-group label svg {
    width: 16px;
    height: 16px;
}

.input-text,
.input-textarea,
.input-select {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.95rem;
    transition: all var(--transition-base);
}

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

.input-textarea {
    resize: vertical;
    min-height: 100px;
}

.input-select {
    cursor: pointer;
    appearance: none;
    background-color: var(--input-bg);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%238b5cf6' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 16px;
    padding-right: 40px;
}

.input-select option {
    background-color: rgba(20, 20, 25, 0.95);
    color: #fff;
    padding: 10px;
}

/* Range Slider */
.input-range {
    width: 100%;
    height: 6px;
    background: var(--input-bg);
    border-radius: var(--radius-full);
    outline: none;
    cursor: pointer;
    -webkit-appearance: none;
}

.input-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    background: var(--accent-gradient);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: var(--shadow-glow);
    transition: transform var(--transition-fast);
}

.input-range::-webkit-slider-thumb:hover {
    transform: scale(1.15);
}

/* Style Buttons Grid */
.style-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-sm);
}

.style-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all var(--transition-base);
}

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

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

/* Duration Options */
.duration-options {
    display: flex;
    gap: var(--spacing-sm);
}

.duration-options .style-btn {
    flex: 1;
}

/* Ratio Buttons */
.ratio-options {
    display: flex;
    gap: var(--spacing-md);
}

.ratio-btn {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all var(--transition-base);
}

.ratio-btn:hover {
    border-color: var(--border-glass-hover);
    color: var(--text-primary);
}

.ratio-btn.active {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.ratio-preview {
    display: block;
    background: currentColor;
    border-radius: 2px;
    opacity: 0.5;
}

.ratio-preview.square {
    width: 24px;
    height: 24px;
}

.ratio-preview.landscape {
    width: 32px;
    height: 18px;
    margin: 7px 0;
}

.ratio-preview.portrait {
    width: 18px;
    height: 32px;
}

/* Voice Buttons */
.voice-options {
    display: flex;
    gap: var(--spacing-md);
}

.voice-btn {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all var(--transition-base);
}

.voice-btn:hover {
    border-color: var(--border-glass-hover);
    color: var(--text-primary);
}

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

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

/* ===== Buttons ===== */
.btn-primary {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    width: 100%;
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--accent-gradient);
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.btn-primary svg {
    width: 20px;
    height: 20px;
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

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

.btn-primary.loading span {
    opacity: 0;
}

.btn-primary.loading .btn-loader {
    display: block;
}

.btn-loader {
    display: none;
    position: absolute;
    width: 24px;
    height: 24px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.btn-secondary {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
}

.btn-secondary svg {
    width: 16px;
    height: 16px;
}

.btn-secondary:hover:not(:disabled) {
    background: var(--bg-glass-hover);
    border-color: var(--border-glass-hover);
    color: var(--text-primary);
}

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

.btn-generate {
    margin-top: var(--spacing-lg);
}

/* ===== Output Panel ===== */
.output-panel {
    display: flex;
    flex-direction: column;
}

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

.output-header h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.output-content {
    flex: 1;
    min-height: 400px;
    max-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--input-bg);
    border: 1px dashed var(--input-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    position: relative;
}

.placeholder {
    text-align: center;
    color: var(--text-muted);
    padding: var(--spacing-xl);
}

.placeholder svg {
    width: 80px;
    height: 80px;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

.placeholder p {
    font-size: 0.95rem;
}

.output-content img {
    max-width: 100%;
    max-height: 100%;
    width: auto;
    height: auto;
    object-fit: contain;
    border-radius: var(--radius-md);
}

/* ===== Step Indicator ===== */
.step-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
}

.step-badge {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--input-bg);
    border: 2px solid var(--input-border);
    border-radius: 50%;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-muted);
    transition: all var(--transition-base);
}

.step-badge.active {
    background: var(--accent-gradient);
    border-color: transparent;
    color: white;
}

.step-badge.completed {
    background: var(--success);
    border-color: transparent;
    color: white;
}

.step-line {
    width: 60px;
    height: 2px;
    background: var(--input-border);
    border-radius: var(--radius-full);
}

/* ===== Lyrics Output ===== */
.lyrics-output {
    margin-top: var(--spacing-lg);
    display: none;
}

.lyrics-output.visible {
    display: block;
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.edit-hint {
    font-weight: 400;
    color: var(--text-muted);
    font-size: 0.8rem;
}

.lyrics-textarea {
    min-height: 200px;
    font-style: italic;
    line-height: 1.8;
}

/* ===== Audio Output ===== */
.audio-output {
    margin-top: var(--spacing-lg);
    display: none;
}

.audio-output.visible {
    display: block;
    animation: slideUp 0.3s ease;
}

.music-result {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.album-cover-container {
    display: none;
    align-items: center;
    gap: var(--spacing-lg);
    padding: var(--spacing-md);
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
}

.album-cover-container.visible {
    display: flex;
}

.album-cover {
    width: 120px;
    height: 120px;
    object-fit: cover;
    border-radius: var(--radius-md);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
    flex-shrink: 0;
}

.album-info {
    flex: 1;
    min-width: 0;
}

.song-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.song-tags {
    font-size: 0.85rem;
    color: var(--text-secondary);
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.song-tags::before {
    content: '🎵';
    margin-right: var(--spacing-xs);
}

.audio-player {
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
}

.waveform {
    height: 80px;
    background: linear-gradient(180deg, transparent 0%, rgba(139, 92, 246, 0.1) 100%);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: flex-end;
    justify-content: center;
    gap: 3px;
    padding: var(--spacing-sm);
    overflow: hidden;
}

.waveform-bars {
    display: flex;
    align-items: flex-end;
    gap: 3px;
    height: 100%;
}

.waveform-bar {
    width: 4px;
    background: var(--accent-gradient);
    border-radius: 2px;
    transition: height 0.1s ease;
}

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

.btn-play {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-gradient);
    border: none;
    border-radius: 50%;
    color: white;
    cursor: pointer;
    transition: all var(--transition-base);
}

.btn-play svg {
    width: 20px;
    height: 20px;
}

.btn-play:hover:not(:disabled) {
    transform: scale(1.1);
    box-shadow: var(--shadow-glow);
}

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

.btn-play .pause-icon {
    display: none;
}

.btn-play.playing .play-icon {
    display: none;
}

.btn-play.playing .pause-icon {
    display: block;
}

.audio-time {
    display: flex;
    gap: var(--spacing-xs);
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-variant-numeric: tabular-nums;
}

.audio-controls .btn-download {
    margin-left: auto;
}

/* ===== Modal ===== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    transform: translateY(20px) scale(0.95);
    transition: transform var(--transition-base);
}

.modal-overlay.active .modal {
    transform: translateY(0) scale(1);
}

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

.modal-header h2 {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.25rem;
}

.modal-header svg {
    width: 24px;
    height: 24px;
    color: var(--accent-primary);
}

.modal-close {
    background: transparent;
    border: none;
}

.modal-body {
    margin-bottom: var(--spacing-xl);
}

.settings-section h3 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.settings-description {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-lg);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-md);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-glass);
}

.modal-footer .btn-primary {
    width: auto;
}

/* ===== Toast Notifications ===== */
.toast-container {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    z-index: 1100;
}

.toast {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-secondary);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(100px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

.toast.error {
    border-left: 4px solid var(--error);
}

.toast.warning {
    border-left: 4px solid var(--warning);
}

.toast-icon {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.toast.success .toast-icon {
    color: var(--success);
}

.toast.error .toast-icon {
    color: var(--error);
}

.toast.warning .toast-icon {
    color: var(--warning);
}

.toast-message {
    font-size: 0.9rem;
    color: var(--text-primary);
}

/* ===== Responsive Design ===== */
@media (max-width: 1024px) {
    .generator-layout {
        grid-template-columns: 1fr;
    }

    .music-layout {
        grid-template-columns: 1fr;
    }

    .output-content {
        min-height: 300px;
    }
}

@media (max-width: 768px) {
    .app-container {
        padding: var(--spacing-md);
    }

    .header {
        flex-wrap: wrap;
        gap: var(--spacing-md);
        padding: var(--spacing-md);
    }

    .nav-tabs {
        order: 3;
        width: 100%;
        justify-content: center;
    }

    .nav-tab span {
        display: none;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

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

    .voice-options {
        flex-direction: column;
    }

    .ratio-options {
        flex-direction: column;
    }

    .modal {
        margin: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }

    .logo-text {
        display: none;
    }

    .btn-primary {
        padding: var(--spacing-md);
    }

    .audio-controls {
        flex-wrap: wrap;
    }

    .audio-controls .btn-download {
        width: 100%;
        margin-left: 0;
        margin-top: var(--spacing-sm);
    }
}