:root {
    --primary-color: #4A90E2;
    --secondary-color: #2C3E50;
    --accent-color: #E74C3C;
    --background-color: #F5F7FA;
    --text-color: #333333;
    --border-radius: 8px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
}

#app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header Styles */
header {
    background-color: white;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 1rem 2rem;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.cta-button {
    background-color: var(--primary-color);
    color: white;
    padding: 0.5rem 1.5rem;
    border-radius: var(--border-radius);
    text-decoration: none;
    transition: background-color 0.3s ease;
}

.cta-button:hover {
    background-color: #357ABD;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 4rem 2rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.highlight {
    color: #FFD700;
}

.subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
}

/* TTS Demo Section */
.tts-demo {
    padding: 3rem 2rem;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.input-section {
    margin-bottom: 1.5rem;
}

textarea {
    width: 100%;
    height: 150px;
    padding: 1rem;
    border: 2px solid #E0E0E0;
    border-radius: var(--border-radius);
    resize: vertical;
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.char-count {
    text-align: right;
    color: #666;
    font-size: 0.9rem;
    margin-top: 0.5rem;
}

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

.voice-settings {
    display: flex;
    gap: 1rem;
}

select {
    padding: 0.5rem;
    border: 2px solid #E0E0E0;
    border-radius: var(--border-radius);
    font-family: inherit;
    flex: 1;
}

button {
    background-color: var(--primary-color);
    color: white;
    padding: 1rem;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    transition: background-color 0.3s ease;
}

button:hover:not(:disabled) {
    background-color: #357ABD;
}

button:disabled {
    background-color: #CCCCCC;
    cursor: not-allowed;
}

button.processing {
    position: relative;
    overflow: hidden;
}

button.processing::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.2),
        transparent
    );
    animation: loading 1.5s infinite;
}

/* Features Section */
.features {
    padding: 4rem 2rem;
    background-color: white;
}

.features h2 {
    text-align: center;
    margin-bottom: 3rem;
    color: var(--secondary-color);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.feature-card {
    text-align: center;
    padding: 2rem;
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
}

.icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    color: var(--secondary-color);
    margin-bottom: 0.5rem;
}

/* Footer */
footer {
    background-color: var(--secondary-color);
    color: white;
    padding: 2rem;
    margin-top: auto;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-link {
    color: white;
    text-decoration: none;
    opacity: 0.8;
    transition: opacity 0.3s ease;
}

.footer-link:hover {
    opacity: 1;
}

/* Animations */
@keyframes loading {
    0% {
        left: -100%;
    }
    100% {
        left: 100%;
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }
    
    .voice-settings {
        flex-direction: column;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }
}