:root {
    --primary-color: #6366f1;
    --secondary-color: #2c3e50;
    --accent-color: #4f46e5;
    --background-color: #ffffff;
    --text-color: #333;
    --border-color: #e5e7eb;
    --hover-color: #4f46e5;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
    min-height: 100vh;
}

/* Main Container */
.main-container {
    min-height: 100vh;
    padding: 2rem 5%;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.main-title {
    font-size: 2.5rem;
    color: var(--text-color);
    text-align: center;
    margin-bottom: 0.5rem;
}

.subtitle {
    text-align: center;
    color: #6b7280;
    margin-bottom: 2rem;
}

/* Video Generator */
.video-generator {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    background-color: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    margin-bottom: 2rem;
}

.input-section {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.text-input-container {
    position: relative;
    background: #f9fafb;
    border-radius: 8px;
    padding: 1rem;
    border: 1px solid var(--border-color);
}

.video-input {
    width: 100%;
    min-height: 120px;
    padding: 0;
    background: transparent;
    border: none;
    resize: none;
    font-size: 0.9rem;
    line-height: 1.5;
    color: var(--text-color);
}

.video-input:focus {
    outline: none;
}

.video-input::placeholder {
    color: #9ca3af;
}

.input-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.input-title {
    font-size: 1rem;
    color: var(--text-color);
    font-weight: 500;
}

.enhance-btn {
    padding: 0.5rem 1rem;
    background-color: transparent;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-color);
    transition: all 0.3s ease;
}

.enhance-btn:hover {
    background-color: #f3f4f6;
}

.char-count {
    position: absolute;
    bottom: 1rem;
    right: 1rem;
    font-size: 0.8rem;
    color: #6b7280;
}

.style-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 0.5rem;
}

.style-btn {
    padding: 0.5rem 1rem;
    background-color: white;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--text-color);
    transition: all 0.3s ease;
}

.style-btn:hover, .style-btn.active {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.generate-btn {
    padding: 1rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: background-color 0.3s ease;
}

.generate-btn:hover {
    background-color: var(--hover-color);
}

.preview-section {
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #f9fafb;
    border-radius: 8px;
    border: 2px dashed var(--border-color);
    min-height: 300px;
}

.video-preview {
    text-align: center;
    color: #6b7280;
}

.preview-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

/* Pro Upgrade Modal */
.upgrade-modal {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    max-width: 500px;
    width: 90%;
    z-index: 1000;
    text-align: center;
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
}

.upgrade-modal h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.upgrade-modal p {
    color: #6b7280;
    margin-bottom: 1.5rem;
}

.features-list {
    text-align: left;
    margin: 1.5rem 0;
}

.features-list li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-color);
}

.features-list i {
    color: var(--primary-color);
}

.modal-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 2rem;
}

.upgrade-btn {
    padding: 0.75rem 1.5rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    transition: background-color 0.3s ease;
}

.upgrade-btn:hover {
    background-color: var(--hover-color);
}

.continue-free-btn {
    padding: 0.75rem 1.5rem;
    background-color: transparent;
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s ease;
}

.continue-free-btn:hover {
    background-color: #f3f4f6;
}

/* Responsive Design */
@media (max-width: 768px) {
    .video-generator {
        grid-template-columns: 1fr;
    }

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

    .preview-section {
        min-height: 200px;
    }

    .modal-buttons {
        flex-direction: column;
    }
}