:root {
    --primary-color: #4e54c8;
    --primary-dark: #2c2f75;
    --primary-light: #8f94fb;
    --success-color: #0ead69;
    --warning-color: #f08700;
    --danger-color: #e63946;
    --light-bg: #f8f9fa;
    --dark-text: #343a40;
    --light-text: #f8f9fa;
    --gray-text: #6c757d;
    --border-radius: 12px;
    --card-shadow: 0 8px 15px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Poppins', sans-serif;
    line-height: 1.6;
    color: var(--dark-text);
    background-color: #f5f7fa;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    margin: 0;
}

a {
    text-decoration: none;
    color: var(--primary-color);
}

.container {
    width: 92%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.5rem 0;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    text-align: center;
    padding: 3rem 2rem;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 200 200" width="200" height="200"><path fill="rgba(255, 255, 255, 0.1)" d="M30,-40.8C40.2,-31.1,50.4,-21.5,54.6,-9.1C58.8,3.4,57.1,18.6,49.2,28.9C41.3,39.2,27.4,44.6,13.5,48.9C-0.5,53.2,-14.4,56.4,-29.2,52.6C-44,48.8,-59.6,38.1,-65.3,23.1C-71,8.2,-66.7,-10.9,-57.7,-25.2C-48.6,-39.5,-34.9,-49,-21.1,-53.6C-7.3,-58.2,6.5,-57.8,17.2,-52.2C27.9,-46.7,35.6,-36,45.8,-26.4C56,-16.7,66.1,-8.4,67,0.6C67.9,9.4,59.5,18.9,49.9,23.7C40.2,28.4,29.3,28.4,20.2,34.2C11.1,40,3.7,51.6,-3.6,56.5C-10.9,61.4,-18.2,59.7,-28.1,57.5C-38.1,55.3,-50.8,52.5,-56.5,44.1C-62.3,35.6,-61.1,21.4,-63.5,7.5C-65.9,-6.5,-71.9,-20.2,-68.5,-31.1C-65.1,-42,-52.3,-50.2,-39.1,-56.9C-25.9,-63.7,-12.9,-69.2,-0.2,-68.9C12.6,-68.6,25.2,-62.6,30,-53.6C34.8,-44.6,32,-32.5,30,-20.4C28,-8.3,26.9,3.8,25.9,16.2C25,28.6,24.2,41.2,16.7,46.3C9.2,51.4,-5,48.9,-19,45.6C-33,42.4,-46.8,38.3,-57.2,29C-67.6,19.6,-74.5,5.1,-73.8,-9.3C-73.1,-23.6,-64.7,-37.8,-52.5,-44.6C-40.3,-51.3,-24.2,-50.7,-9.6,-56.5C5,-62.3,18.1,-74.5,29.7,-74.9C41.3,-75.2,51.3,-63.6,57.1,-50.8C62.9,-38,64.4,-24,58.6,-14.5C52.8,-5,39.8,0,32.9,9.2C26.1,18.3,25.4,31.6,19.9,39.7C14.3,47.9,3.9,50.9,-4.7,47.3C-13.3,43.7,-19.9,33.5,-24.8,24.6C-29.7,15.7,-33,8,-38.3,-2.1C-43.7,-12.2,-51.1,-24.9,-48.6,-34.2C-46.1,-43.5,-33.6,-49.5,-21.5,-55.9C-9.5,-62.2,2.2,-68.8,12.5,-66.6C22.8,-64.3,31.8,-53.1,38.8,-42.2Z" transform="translate(100 100)"></path></svg>') center center / cover no-repeat;
    opacity: 0.4;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 2.8rem;
    margin-bottom: 0.5rem;
    font-weight: 700;
    letter-spacing: 1px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.hero .subtitle {
    font-size: 1.2rem;
    margin-bottom: 1.5rem;
    font-weight: 300;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-cta {
    margin-top: 1.5rem;
}

.cta-button {
    display: inline-block;
    background-color: white;
    color: var(--primary-color);
    font-weight: 600;
    padding: 0.7rem 1.8rem;
    border-radius: 30px;
    font-size: 1rem;
    transition: var(--transition);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.2);
}

/* Card Styles */
.card {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--card-shadow);
    margin-bottom: 1.5rem;
    overflow: hidden;
    transition: var(--transition);
}

.card:hover {
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
    transform: translateY(-2px);
}

.card-header {
    padding: 1.25rem 1.75rem;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.card-header h2 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.card-header i {
    font-size: 1.2rem;
}

.card-header p {
    color: var(--gray-text);
    font-size: 0.95rem;
}

.card-body {
    padding: 1.5rem;
}

/* Upload Form Styles */
.upload-area {
    padding: 2rem;
    border: 2px solid #d1d5db;
    border-radius: var(--border-radius);
    text-align: center;
    margin-bottom: 1.5rem;
    transition: var(--transition);
    background-color: #f5f7ff;
    position: relative;
    min-height: 200px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    overflow: hidden;
    max-height: 600px;
}

.upload-area:hover, .upload-area.highlight {
    border-color: var(--primary-color);
    background-color: #eef1ff;
    box-shadow: 0 4px 10px rgba(78, 84, 200, 0.1);
}

.upload-area.highlight {
    border-width: 3px;
    border-style: solid;
    border-color: var(--primary-color);
    box-shadow: 0 6px 15px rgba(78, 84, 200, 0.2);
}

.upload-area.has-files {
    padding: 1rem;
    min-height: auto;
    background-color: #f8f9fb;
    display: block;
    overflow: visible;
}

.upload-area.has-files.has-video {
    padding: 1rem;
    height: auto;
    overflow: visible;
}

.upload-area.has-files .preview-content.single-video {
    margin-bottom: 0.5rem;
}

.file-input-label {
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    font-weight: 500;
    color: var(--primary-color);
}

.upload-area.has-files .file-input-placeholder {
    display: none;
}

.file-input-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.file-input-label p {
    font-size: 1.1rem;
    margin: 0.5rem 0;
    color: var(--gray-text);
}

.file-input-label i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    transition: var(--transition);
}

.upload-area:hover .file-input-label i {
    transform: scale(1.1);
}

.file-input-label span {
    background-color: var(--primary-color);
    color: white;
    padding: 0.6rem 1.2rem;
    border-radius: 30px;
    font-weight: 500;
    box-shadow: 0 4px 8px rgba(78, 84, 200, 0.2);
    transition: var(--transition);
    display: inline-block;
}

.file-input-label:hover span {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(78, 84, 200, 0.3);
}

input[type="file"] {
    width: 0.1px;
    height: 0.1px;
    opacity: 0;
    overflow: hidden;
    position: absolute;
    z-index: -1;
}

.file-note {
    margin-top: 1.2rem;
    font-size: 0.9rem;
    color: var(--gray-text);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.3rem;
}

.file-limits {
    margin-top: 0.5rem;
    font-size: 0.85rem;
    color: var(--warning-color);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.3rem;
}

.file-limits i {
    font-size: 0.9rem;
    color: var(--warning-color);
}

/* Integrated Preview Styles */
.preview-content {
    padding: 1rem;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 1rem;
    justify-content: center;
    align-items: center;
    width: 100%;
    background-color: white;
    margin-top: 1rem;
    max-height: 300px;
    overflow-y: auto;
    border-radius: 8px;
    background-color: #f8f9fb;
    scrollbar-width: thin;
    scrollbar-color: var(--primary-light) #f0f0f0;
}

.preview-item {
    position: relative;
    width: 100%;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s ease;
    aspect-ratio: 1 / 1;
}

.preview-item:hover {
    transform: scale(1.05);
}

.preview-item img {
    width: 100%;
    height: 100%;
    display: block;
    object-fit: cover;
    border-radius: 6px;
}

.preview-item video {
    width: 100%;
    height: 100%;
    display: block;
    object-fit: cover;
    border-radius: 6px;
}

/* Enhanced remove button styling */
.preview-item .remove-item {
    position: absolute;
    top: 6px;
    right: 6px;
    background-color: rgba(0, 0, 0, 0);
    color: rgba(255, 255, 255, 0); 
    border: none;
    border-radius: 4px;
    width: 22px;
    height: 22px;
    font-size: 11px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
    z-index: 10;
    opacity: 0;
    padding: 0;
    pointer-events: none; /* Initially not clickable */
}

/* Show remove button on hover */
.preview-item:hover .remove-item {
    background-color: rgba(60, 60, 60, 0.7);
    color: rgba(255, 255, 255, 0.9);
    opacity: 1;
    pointer-events: auto; /* Make clickable on hover */
    backdrop-filter: blur(2px);
}

.preview-item .remove-item:hover {
    background-color: rgba(229, 57, 53, 0.85);
    color: white;
    transform: scale(1.1);
}

.preview-item .remove-item:active {
    transform: scale(0.95);
}

.preview-item .remove-item i {
    position: relative;
    line-height: 1;
}

/* Animation for removing items */
@keyframes fadeOut {
    from { opacity: 1; transform: scale(1); }
    to { opacity: 0; transform: scale(0.8); }
}

.preview-item.removing {
    animation: fadeOut 0.3s ease forwards;
    pointer-events: none;
}

/* Animation for reflowing items */
@keyframes reflow {
    from { transform: translateY(10px); opacity: 0.5; }
    to { transform: translateY(0); opacity: 1; }
}

.preview-item.reflowing {
    animation: reflow 0.3s ease forwards;
}

.preview-item .file-info {
    display: none;
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 4px;
    font-size: 10px;
    text-align: center;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.preview-item:hover .file-info {
    display: block;
}

/* Fix for single video preview */
.preview-content.single-video {
    display: block;
    max-height: 450px;
    overflow: hidden;
    width: 100%;
}

.preview-content.single-video .preview-item {
    max-width: 100%;
    width: 100%;
    aspect-ratio: 16 / 9;
    margin: 0 auto;
    height: auto;
    max-height: 450px;
    position: relative;
}

.preview-content.single-video video {
    width: 100%;
    height: 100%;
    object-fit: contain;
    background-color: #000;
    border-radius: 6px;
    max-height: 450px;
}

.preview-container {
    display: none; /* We don't need this anymore */
}

/* Adjust for mobile */
@media (max-width: 768px) {
    .preview-content {
        grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
        gap: 0.5rem;
    }
    
    .upload-area.has-files {
        padding: 1rem;
    }
}

/* Token Usage */
.token-usage {
    background-color: #f8f9fb;
    border-radius: var(--border-radius);
    padding: 1.25rem;
    border: 1px solid #e2e8f0;
}

.token-usage h3 {
    font-size: 1.05rem;
    margin-bottom: 0.875rem;
    color: var(--primary-dark);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.875rem;
}

.stat-item {
    background-color: white;
    padding: 0.875rem;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    align-items: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.cost-container {
    grid-column: span 2;
}

.cost-values {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.3rem;
}

.cost-separator {
    color: var(--gray-text);
    font-weight: 400;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--gray-text);
    margin-bottom: 0.5rem;
}

.stat-value {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--primary-color);
}

#input-tokens, #output-tokens {
    color: var(--primary-dark);
}

#cost-usd, #cost-thb {
    color: var(--success-color);
}

/* Error Message */
.error-card {
    display: none;
    padding: 1.5rem;
    text-align: center;
    background-color: #fff5f5;
    border-left: 4px solid var(--danger-color);
}

.error-card i {
    font-size: 2rem;
    color: var(--danger-color);
    margin-bottom: 1rem;
}

.error-card p {
    color: var(--danger-color);
    font-weight: 500;
    margin-bottom: 1.25rem;
}

.retry-button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 30px;
    padding: 0.6rem 1.2rem;
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.retry-button:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

.retry-button:active {
    transform: translateY(0);
}

/* Results display state */
#results {
    display: none;
}

/* Footer */
footer {
    margin-top: auto;
    background-color: #f1f5f9;
    padding: 1.25rem 0;
    text-align: center;
}

footer p {
    color: var(--gray-text);
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.2rem;
    }
    
    .hero .subtitle {
        font-size: 1rem;
    }
    
    .hero {
        padding: 2.5rem 1.5rem;
    }
    
    .card-header, .card-body {
        padding: 1rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .cost-container {
        grid-column: span 1;
    }
    
    .file-input-label i {
        font-size: 2.5rem;
    }
    
    .file-input-label p {
        font-size: 1rem;
    }
    
    .upload-area {
        padding: 1.5rem 1rem;
    }
    
    .submit-button {
        padding: 0.8rem;
        font-size: 1rem;
    }
    
    .copy-btn {
        top: 5px;
        right: 5px;
        padding: 0.2rem 0.4rem;
        font-size: 0.8rem;
    }
    
    .caption-content p {
        padding: 1rem;
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 1.8rem;
    }
    
    .hero .subtitle {
        font-size: 0.9rem;
    }
    
    .card-header h2 {
        font-size: 1.3rem;
    }
    
    .card-header p {
        font-size: 0.85rem;
    }
    
    .container {
        width: 95%;
        padding: 1rem 0;
    }
    
    .file-input-label span {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }
    
    .file-note {
        font-size: 0.8rem;
    }
    
    .stat-value {
        font-size: 1rem;
    }
    
    .token-usage h3 {
        font-size: 1rem;
    }
    
    .caption-box h3 {
        font-size: 0.95rem;
        padding: 0.7rem;
    }
}

/* Submit Button */
.submit-button {
    width: 100%;
    padding: 1rem;
    background: linear-gradient(to right, var(--primary-color), var(--primary-light));
    color: white;
    border: none;
    border-radius: 30px;
    font-weight: 600;
    font-size: 1.1rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.submit-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(78, 84, 200, 0.3);
}

.submit-button:active {
    transform: translateY(1px);
}

/* Loading State */
#loading {
    display: none;
    padding: 2rem;
    text-align: center;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 5px solid rgba(78, 84, 200, 0.2);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    margin: 0 auto 1.5rem;
    animation: spin 1s linear infinite;
}

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

/* Results Section */
.caption-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.25rem;
    margin-bottom: 1.5rem;
}

@media (min-width: 768px) {
    .caption-container {
        grid-template-columns: 1fr 1fr;
    }
}

.caption-box {
    border: 1px solid #e2e8f0;
    border-radius: var(--border-radius);
    overflow: hidden;
}

.caption-box h3 {
    padding: 0.875rem;
    background-color: #f8f9fa;
    border-bottom: 1px solid #e2e8f0;
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--dark-text);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.caption-content {
    position: relative;
}

.caption-content p {
    padding: 1.25rem;
    min-height: 90px;
    background-color: white;
    font-size: 0.95rem;
    line-height: 1.7;
    color: var(--dark-text);
    white-space: pre-wrap;
    padding-right: 2.5rem;
}

.copy-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    background-color: white;
    border: 1px solid #e2e8f0;
    border-radius: 4px;
    padding: 0.3rem 0.5rem;
    cursor: pointer;
    font-size: 0.9rem;
    opacity: 0.7;
    transition: var(--transition);
}

.copy-btn:hover {
    opacity: 1;
    background-color: var(--primary-light);
    color: white;
}

/* Only show scrollbar when necessary */
.preview-content::-webkit-scrollbar {
    width: 6px;
}

.preview-content::-webkit-scrollbar-track {
    background: #f0f0f0;
    border-radius: 4px;
}

.preview-content::-webkit-scrollbar-thumb {
    background-color: var(--primary-light);
    border-radius: 4px;
}