:root {
    --primary-color: #4a6cf7;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --white-color: #ffffff;
    --gray-color: #6c757d;
    --border-radius: 8px;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--dark-color);
    background-color: #f5f7fa;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 20px;
    padding: 20px;
    background-color: var(--white-color);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    position: relative;
}

header h1 {
    color: var(--primary-color);
    margin-bottom: 10px;
}

header p {
    color: var(--gray-color);
}

main {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 30px;
}

section {
    background-color: var(--white-color);
    border-radius: var(--border-radius);
    padding: 15px;
    box-shadow: var(--box-shadow);
}

section h2 {
    margin-bottom: 15px;
    color: var(--primary-color);
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 5px;
}

/* Collapsible Sections */
section details {
    width: 100%;
}

section details summary {
    cursor: pointer;
    list-style: none;
    user-select: none;
    padding: 0;
    margin: 0;
}

section details summary::-webkit-details-marker {
    display: none;
}

section details summary h2 {
    margin: 0;
    padding: 8px 0;
    border: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: var(--transition);
}

section details summary h2::after {
    content: '▼';
    font-size: 14px;
    color: var(--primary-color);
    transition: transform 0.3s ease;
    margin-left: 10px;
}

section details[open] summary h2::after {
    transform: rotate(180deg);
}

section details summary:hover h2 {
    opacity: 0.8;
}

section .section-content {
    animation: slideDown 0.3s ease;
    padding-top: 10px;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Info Box */
.info-box {
    background-color: rgba(74, 108, 247, 0.1);
    border-left: 4px solid var(--primary-color);
    padding: 10px 15px;
    margin-bottom: 15px;
    border-radius: var(--border-radius);
}

.info-box p {
    margin: 0;
    font-size: 14px;
    color: var(--dark-color);
}

/* Upload Section */
.upload-area {
    border: 2px dashed var(--primary-color);
    border-radius: var(--border-radius);
    padding: 20px;
    text-align: center;
    transition: var(--transition);
    cursor: pointer;
}

.upload-area:hover {
    background-color: rgba(74, 108, 247, 0.05);
}

.upload-area.dragover {
    background-color: rgba(74, 108, 247, 0.1);
    border-color: var(--primary-color);
}

.upload-area.has-video {
    padding: 10px;
    border-style: solid;
}

.upload-area.has-video .upload-icon {
    font-size: 24px;
}

.upload-area.has-video p:not(.upload-hint) {
    font-size: 14px;
    margin: 5px 0;
}

.upload-area.has-video .upload-hint {
    display: none;
}

.upload-label {
    cursor: pointer;
}

.upload-icon {
    font-size: 40px;
    margin-bottom: 10px;
    transition: var(--transition);
}

.upload-hint {
    font-size: 14px;
    color: var(--gray-color);
}

/* Text Section */
.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 600;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    font-size: 16px;
}

.form-group textarea {
    min-height: 80px;
    resize: vertical;
}

.form-group input[type="range"] {
    padding: 0;
}

.form-group input[type="color"] {
    height: 40px;
    cursor: pointer;
}

/* Preview Section */
.preview-section {
    grid-column: span 2;
}

.video-container {
    position: relative;
    width: 100%;
    max-width: 450px;
    margin: 0 auto;
    background-color: #000;
    border-radius: var(--border-radius);
    overflow: hidden;
    aspect-ratio: 9/16;
}

#videoPreview {
    width: 100%;
    height: 100%;
    display: block;
    object-fit: cover;
}

.text-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 8%;
    pointer-events: none;
}

.text-overlay.top {
    justify-content: flex-start;
    padding-top: 8%;
}

.text-overlay.bottom {
    justify-content: flex-end;
    padding-bottom: 8%;
}

#overlayQuote {
    font-size: 32px;
    text-align: center;
    margin-bottom: 10px;
    color: #ffffff;
    max-width: 90%;
    word-wrap: break-word;
    line-height: 1.3;
    padding: 20px 30px;
    background: linear-gradient(135deg, rgba(0, 0, 0, 0.7), rgba(30, 30, 30, 0.6));
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    animation: fadeIn 0.5s ease-in-out;
    /* Dynamic text sizing and styles */
    transition: font-size 0.3s ease, background 0.3s ease, font-weight 0.3s ease, font-style 0.3s ease, text-decoration 0.3s ease;
    /* Preserve line breaks */
    white-space: pre-line;
}

#overlayAuthor {
    font-size: 20px;
    font-style: italic;
    text-align: right;
    color: #ffffff;
    max-width: 85%;
    align-self: flex-end;
    padding: 10px 20px;
    background: linear-gradient(135deg, rgba(0, 0, 0, 0.6), rgba(30, 30, 30, 0.5));
    border-radius: 15px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    animation: fadeIn 0.5s ease-in-out;
    transition: background 0.3s ease;
}

/* Font Size Section */
.font-size-section {
    grid-column: span 2;
    text-align: center;
}

.font-size-section details {
    width: 100%;
}

.font-size-section details summary {
    cursor: pointer;
    list-style: none;
    user-select: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 0;
    transition: var(--transition);
}

.font-size-section details summary::-webkit-details-marker {
    display: none;
}

.font-size-section details summary h2 {
    margin: 0;
    padding: 0;
    border: none;
    flex: 1;
}

.font-size-section details summary::after {
    content: '▼';
    font-size: 14px;
    color: var(--primary-color);
    transition: transform 0.3s ease;
    margin-left: 10px;
}

.font-size-section details[open] summary::after {
    transform: rotate(180deg);
}

.font-size-section details summary:hover {
    opacity: 0.8;
}

.font-size-controls {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    padding-top: 15px;
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.font-size-controls .form-group {
    width: 100%;
    max-width: 500px;
}

.font-size-controls input[type="range"] {
    width: 100%;
    margin: 10px 0;
}

#fontSizeValue {
    display: inline-block;
    margin-left: 10px;
    font-weight: bold;
    color: var(--primary-color);
}

/* Export Section */
.export-section {
    grid-column: span 2;
    text-align: center;
}

.export-controls {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.btn-primary {
    background-color: var(--primary-color);
    color: var(--white-color);
    border: none;
    padding: 12px 24px;
    border-radius: var(--border-radius);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary:hover:not(:disabled) {
    background-color: #3a5bd9;
}

.btn-primary:disabled {
    background-color: var(--gray-color);
    cursor: not-allowed;
}

.btn-ai {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--white-color);
    border: none;
    padding: 10px 20px;
    border-radius: var(--border-radius);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    margin-top: 10px;
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.3);
}

.btn-ai:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.btn-ai:disabled {
    background: linear-gradient(135deg, #a0a0a0 0%, #808080 100%);
    cursor: not-allowed;
    opacity: 0.6;
}

.btn-ai.loading {
    position: relative;
    color: transparent;
}

.btn-ai.loading::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    top: 50%;
    left: 50%;
    margin-left: -8px;
    margin-top: -8px;
    border: 2px solid var(--white-color);
    border-radius: 50%;
    border-top-color: transparent;
    animation: spinner 0.8s linear infinite;
}

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

.btn-download {
    background-color: var(--success-color);
    color: var(--white-color);
    text-decoration: none;
    padding: 12px 24px;
    border-radius: var(--border-radius);
    font-size: 16px;
    font-weight: 600;
    transition: var(--transition);
    display: inline-block;
}

.btn-download:hover {
    background-color: #218838;
}

/* Progress Bar */
.progress-container {
    width: 100%;
    max-width: 500px;
}

.progress-bar {
    width: 100%;
    height: 20px;
    background-color: #e9ecef;
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 10px;
}

.progress-fill {
    height: 100%;
    background-color: var(--primary-color);
    width: 0%;
    transition: width 0.3s ease;
}

/* Settings Button */
.settings-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--primary-color);
    transition: var(--transition);
    padding: 8px;
    border-radius: 50%;
    display: none; /* Hide by default */
}

.settings-btn:hover {
    background-color: rgba(74, 108, 247, 0.1);
}

.settings-btn.visible {
    display: block; /* Show only when explicitly made visible */
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.5);
}

.modal-content {
    background-color: var(--white-color);
    margin: 10% auto;
    padding: 0;
    border-radius: var(--border-radius);
    width: 80%;
    max-width: 500px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    animation: modalopen 0.4s;
}

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

@keyframes fadeIn {
    from {opacity: 0; transform: translateY(10px);}
    to {opacity: 1; transform: translateY(0);}
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    border-bottom: 1px solid #eee;
}

.modal-header h2 {
    margin: 0;
    border: none;
    padding: 0;
}

.close-btn {
    font-size: 28px;
    font-weight: bold;
    color: var(--gray-color);
    cursor: pointer;
    transition: var(--transition);
}

.close-btn:hover {
    color: var(--dark-color);
}

.modal-body {
    padding: 20px;
    max-height: 70vh;
    overflow-y: auto;
}

.modal-footer {
    padding: 20px;
    border-top: 1px solid #eee;
    text-align: right;
}

.form-group input[type="checkbox"] {
    width: auto;
    margin-right: 10px;
}

/* Utility Classes */
.hidden {
    display: none;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 8px;
    }
    
    header {
        padding: 12px;
        margin-bottom: 12px;
    }
    
    header h1 {
        font-size: 22px;
    }
    
    header p {
        font-size: 13px;
    }
    
    main {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    
    section {
        padding: 10px;
    }
    
    .preview-section,
    .export-section,
    .font-size-section {
        grid-column: span 1;
    }
    
    .info-box {
        padding: 8px 12px;
        margin-bottom: 10px;
        font-size: 13px;
    }
    
    .upload-area {
        padding: 15px;
    }
    
    .upload-area.has-video {
        padding: 8px;
    }
    
    .upload-icon {
        font-size: 32px;
    }
    
    .upload-area.has-video .upload-icon {
        font-size: 20px;
    }
    
    .video-container {
        max-width: 100%;
        aspect-ratio: 9/16;
    }
    
    #overlayQuote {
        font-size: 24px;
        max-width: 90%;
        padding: 12px 15px;
        border-radius: 15px;
        /* Dynamic text sizing */
        transition: font-size 0.3s ease, background 0.3s ease;
    }
    
    #overlayAuthor {
        font-size: 16px;
        max-width: 90%;
        padding: 8px 15px;
        border-radius: 12px;
    }
    
    .btn-primary,
    .btn-download {
        padding: 12px 20px;
        font-size: 15px;
        width: 100%;
        max-width: 300px;
    }
    
    .modal-content {
        width: 95%;
        margin: 5% auto;
    }
    
    .form-group {
        margin-bottom: 10px;
    }
    
    .form-group input,
    .form-group textarea,
    .form-group select {
        padding: 10px;
        font-size: 16px;
    }
    
    .form-group textarea {
        min-height: 70px;
    }
    
    section h2 {
        font-size: 16px;
        margin-bottom: 10px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 5px;
    }
    
    header {
        padding: 10px;
        margin-bottom: 10px;
    }
    
    header h1 {
        font-size: 18px;
    }
    
    header p {
        font-size: 12px;
    }
    
    section {
        padding: 8px;
    }
    
    section h2 {
        font-size: 15px;
    }
    
    .info-box {
        padding: 6px 10px;
        margin-bottom: 8px;
        font-size: 12px;
    }
    
    .upload-area {
        padding: 12px;
    }
    
    .upload-area.has-video {
        padding: 6px;
    }
    
    .upload-icon {
        font-size: 28px;
    }
    
    .upload-area.has-video .upload-icon {
        font-size: 18px;
    }
    
    .video-container {
        max-width: 100%;
    }
    
    #overlayQuote {
        font-size: 20px;
        max-width: 90%;
        padding: 10px 12px;
        border-radius: 12px;
        /* Dynamic text sizing */
        transition: font-size 0.3s ease, background 0.3s ease;
    }
    
    #overlayAuthor {
        font-size: 14px;
        max-width: 90%;
        padding: 6px 12px;
        border-radius: 10px;
    }
    
    .form-group textarea {
        min-height: 60px;
    }
}

footer {
    text-align: center;
    padding: 15px;
    color: var(--gray-color);
    font-size: 14px;
}

@media (max-width: 768px) {
    footer {
        padding: 10px;
        font-size: 12px;
    }
}