/* Modern CSS Reset */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* CSS Variables for Design System */
:root {
    /* Colors */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --accent-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --success-gradient: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
    
    --bg-primary: #0f0f23;
    --bg-secondary: #1a1a3a;
    --bg-card: rgba(255, 255, 255, 0.05);
    --bg-input: rgba(255, 255, 255, 0.1);
    
    --text-primary: #ffffff;
    --text-secondary: #a0a0db;
    --text-muted: #6b7280;
    
    --border-color: rgba(255, 255, 255, 0.1);
    --border-hover: rgba(255, 255, 255, 0.2);
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 40px rgba(102, 126, 234, 0.3);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* Transitions */
    --transition-fast: 0.2s ease-out;
    --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* Base Styles */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
}

/* Background Animation */
.background-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.wave {
    position: absolute;
    border-radius: 50%;
    opacity: 0.1;
    animation: float 6s ease-in-out infinite;
}

.wave1 {
    width: 300px;
    height: 300px;
    background: var(--primary-gradient);
    top: 10%;
    left: 10%;
    animation-delay: 0s;
}

.wave2 {
    width: 200px;
    height: 200px;
    background: var(--secondary-gradient);
    top: 60%;
    right: 10%;
    animation-delay: 2s;
}

.wave3 {
    width: 150px;
    height: 150px;
    background: var(--accent-gradient);
    bottom: 20%;
    left: 60%;
    animation-delay: 4s;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    25% { transform: translateY(-20px) rotate(90deg); }
    50% { transform: translateY(-40px) rotate(180deg); }
    75% { transform: translateY(-20px) rotate(270deg); }
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-lg);
    position: relative;
    z-index: 1;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    animation: slideDown 0.8s ease-out;
}

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

.logo-icon {
    font-size: 3rem;
    animation: pulse 2s ease-in-out infinite;
}

.logo-text {
    font-size: 3.5rem;
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.tagline {
    font-size: 1.25rem;
    color: var(--text-secondary);
    font-weight: 300;
}

/* Main Content */
.main-content {
    display: grid;
    gap: var(--spacing-xl);
    animation: fadeInUp 1s ease-out 0.3s both;
}

/* Input Section */
.input-section {
    position: relative;
}

.textarea-container {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    backdrop-filter: blur(20px);
    transition: all var(--transition-smooth);
}

.textarea-container:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-glow);
}

.text-input {
    width: 100%;
    min-height: 200px;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1.1rem;
    font-family: inherit;
    resize: vertical;
    outline: none;
    line-height: 1.8;
}

.text-input::placeholder {
    color: var(--text-muted);
    opacity: 0.8;
}

.char-counter {
    position: absolute;
    bottom: var(--spacing-sm);
    right: var(--spacing-sm);
    color: var(--text-muted);
    font-size: 0.875rem;
    font-weight: 500;
}

/* Controls Section */
.controls-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: end;
}

.voice-selector-container,
.speed-control {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    backdrop-filter: blur(20px);
    transition: all var(--transition-smooth);
}

.voice-selector-container:hover,
.speed-control:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
}

.voice-label,
.speed-label {
    display: block;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.select-wrapper {
    position: relative;
}

.voice-select {
    width: 100%;
    padding: var(--spacing-sm);
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1rem;
    cursor: pointer;
    appearance: none;
    transition: all var(--transition-smooth);
}

.voice-select:hover {
    border-color: var(--border-hover);
}

.voice-select:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
    background-color: #0f0f23;
}

.select-arrow {
    position: absolute;
    right: var(--spacing-sm);
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    pointer-events: none;
    transition: transform var(--transition-fast);
}

.voice-select:focus + .select-arrow {
    transform: translateY(-50%) rotate(180deg);
}

.speed-slider {
    width: 100%;
    height: 6px;
    background: var(--bg-input);
    border-radius: 3px;
    appearance: none;
    cursor: pointer;
    margin-bottom: var(--spacing-xs);
}

.speed-slider::-webkit-slider-thumb {
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-gradient);
    cursor: pointer;
    transition: transform var(--transition-fast);
}

.speed-slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.speed-value {
    display: block;
    text-align: center;
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.875rem;
}

/* Action Buttons */
.action-buttons {
    grid-column: 1 / -1;
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
    margin-top: var(--spacing-md);
}

.play-button,
.pause-button,
.stop-button,
.download-button {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

.play-button {
    background: var(--primary-gradient);
    color: white;
    box-shadow: var(--shadow-md);
}

.play-button:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.pause-button,
.stop-button {
    background: var(--secondary-gradient);
    color: white;
}

.download-button {
    background: var(--success-gradient);
    color: white;
}

.play-button:disabled,
.pause-button:disabled,
.stop-button:disabled,
.download-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.button-icon {
    font-size: 1.1rem;
}

.button-text {
    font-weight: 600;
}

/* Visualizer Section */
.visualizer-section {
    text-align: center;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    backdrop-filter: blur(20px);
}

.audio-visualizer {
    display: flex;
    justify-content: center;
    align-items: end;
    gap: 4px;
    height: 80px;
    margin-bottom: var(--spacing-md);
}

.audio-bar {
    width: 8px;
    background: var(--accent-gradient);
    border-radius: 4px;
    transition: height var(--transition-fast);
}

.audio-bar:nth-child(1) { height: 20px; animation-delay: 0.1s; }
.audio-bar:nth-child(2) { height: 30px; animation-delay: 0.2s; }
.audio-bar:nth-child(3) { height: 40px; animation-delay: 0.3s; }
.audio-bar:nth-child(4) { height: 60px; animation-delay: 0.4s; }
.audio-bar:nth-child(5) { height: 50px; animation-delay: 0.5s; }
.audio-bar:nth-child(6) { height: 35px; animation-delay: 0.6s; }
.audio-bar:nth-child(7) { height: 45px; animation-delay: 0.7s; }
.audio-bar:nth-child(8) { height: 25px; animation-delay: 0.8s; }

.audio-visualizer.active .audio-bar {
    animation: audioWave 0.8s ease-in-out infinite alternate;
}

@keyframes audioWave {
    0% { height: 20px; }
    100% { height: 60px; }
}

.status-message {
    font-size: 1.1rem;
    color: var(--text-secondary);
    font-weight: 500;
    transition: color var(--transition-smooth);
}

.status-message.speaking {
    color: #667eea;
    animation: pulse 1.5s ease-in-out infinite;
}

/* Footer */
.footer {
    text-align: center;
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* Animations */
@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: var(--spacing-md);
    }
    
    .logo-text {
        font-size: 2.5rem;
    }
    
    .controls-section {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .action-buttons {
        grid-column: 1;
    }
    
    .text-input {
        min-height: 150px;
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .action-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .play-button,
    .pause-button,
    .stop-button,
    .download-button {
        width: 100%;
        max-width: 200px;
        justify-content: center;
    }
}