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

body {
    font-family: 'Arial', sans-serif;
    min-height: 100vh;
    background-color: #121212; /* Fallback color */
    color: #ffffff;
    position: relative;
    overflow-x: hidden;
}

body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('assets/edit-341776933.gif') center/cover no-repeat fixed;
    z-index: -2;
    will-change: transform; /* Optimize animation performance */
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    animation: glow 3s infinite alternate;
    z-index: -1;
    will-change: opacity; /* Optimize animation performance */
}

@keyframes glow {
    from {
        background: rgba(0, 0, 0, 0.5);
    }
    to {
        background: rgba(0, 0, 0, 0.7);
    }
}

/* Preload background image */
.preload-images {
    position: absolute;
    width: 0;
    height: 0;
    overflow: hidden;
    z-index: -9999;
}
.preload-images img {
    position: absolute;
}

.container {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    z-index: 1;
}

h1 {
    font-size: 3rem;
    margin-bottom: 3rem;
    text-align: center;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
}

.upload-section {
    width: 100%;
    max-width: 500px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.3);
}

.upload-box {
    text-align: center;
    margin-bottom: 2rem;
}

.file-input {
    display: none;
}

.upload-button {
    display: inline-block;
    padding: 1rem 2rem;
    background: linear-gradient(45deg, #7289da, #5865f2);
    color: white;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1.2rem;
    transition: transform 0.2s, box-shadow 0.2s;
}

.upload-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

.progress-container {
    text-align: center;
    margin-top: 2rem;
}

.progress-text {
    font-size: 2rem;
    margin-bottom: 1rem;
    font-weight: bold;
}

.progress-bar {
    width: 100%;
    height: 20px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    overflow: hidden;
}

.progress-fill {
    width: 0%;
    height: 100%;
    background: linear-gradient(45deg, #7289da, #5865f2);
    transition: width 0.3s ease;
}

.status-message {
    margin-top: 1rem;
    text-align: center;
    min-height: 1.5em;
    color: #ffffff;
    font-weight: 500;
    transition: color 0.3s ease;
}

.error-message {
    margin-top: 0.5rem;
    text-align: center;
    min-height: 1.5em;
    color: #ff4444;
    font-size: 0.9rem;
    background-color: rgba(255, 68, 68, 0.1);
    padding: 0.5rem;
    border-radius: 4px;
    border-left: 3px solid #ff4444;
    display: none; /* Hidden by default */
}

.error-message.visible {
    display: block;
}

/* Chunk progress improvements */
.chunk-progress-container {
    margin-top: 0.75rem;
    text-align: center;
}

.chunk-progress-text {
    font-size: 0.9rem;
    margin-bottom: 0.25rem;
    color: #ffffff;
    opacity: 0.9;
}

.chunk-progress-bar {
    width: 100%;
    height: 10px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 5px;
    overflow: hidden;
}

.chunk-progress-fill {
    width: 0%;
    height: 100%;
    background: linear-gradient(45deg, #43b581, #3ca374);
    transition: width 0.2s ease;
}


/* Button Group Styling */
.upload-controls {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin: 1.5rem 0;
}

.button-group {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
}

.primary-controls {
    margin-bottom: 0.5rem;
}

/* Button Styling */
.button {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.primary-button {
    background: linear-gradient(45deg, #7289da, #5865f2);
    color: white;
}

.primary-button:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(88, 101, 242, 0.4);
}

.danger-button {
    background: linear-gradient(45deg, #ed4245, #f04747);
    color: white;
}

.danger-button:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(237, 66, 69, 0.4);
}

.secondary-button {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.secondary-button:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-1px);
}

/* Validation error styles */
.input-error {
    border: 1px solid #f04747 !important;
    box-shadow: 0 0 5px rgba(240, 71, 71, 0.5);
}

.input-group {
    position: relative;
}

.validation-message {
    color: #f04747;
    font-size: 0.8rem;
    margin-top: 0.25rem;
    display: none;
}

.validation-message.visible {
    display: block;
}

/* File size limit warning */
.file-size-warning {
    background-color: rgba(255, 186, 8, 0.1);
    border-left: 3px solid #ffba08;
    color: #ffba08;
    padding: 0.5rem;
    margin-top: 0.5rem;
    border-radius: 4px;
    font-size: 0.9rem;
    display: none;
}

.file-size-warning.visible {
    display: block;
}

/* Loading spinner for background image */
.loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: #121212;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loader.hidden {
    opacity: 0;
    visibility: hidden;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    border-top-color: #7289da;
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* File management improvements */
.file-management {
    width: 100%;
    max-width: 100%;
    margin-top: 2rem;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.3);
}

.file-management h2 {
    margin-bottom: 1rem;
    text-align: center;
    font-size: 1.75rem;
}

#fileTable {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 8px;
    overflow: hidden;
}

#fileTable th {
    background-color: rgba(114, 137, 218, 0.3);
    color: white;
    text-align: left;
    padding: 0.75rem;
    font-weight: 600;
}

#fileTable td {
    padding: 0.75rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

#fileTable tr:hover {
    background-color: rgba(255, 255, 255, 0.05);
}

.url-status {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 500;
}

.url-status-valid {
    background-color: rgba(67, 181, 129, 0.2);
    color: #43b581;
}

.url-status-invalid {
    background-color: rgba(240, 71, 71, 0.2);
    color: #f04747;
}

.actions-dropdown {
    position: relative;
    display: inline-block;
}

.actions-btn {
    background: linear-gradient(45deg, #7289da, #5865f2);
    color: white;
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
}

.actions-content {
    display: none;
    position: absolute;
    right: 0;
    background-color: #2a2d30;
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.5);
    z-index: 1;
    border-radius: 4px;
    overflow: hidden;
}

.actions-content.show {
    display: block;
}

.action-item {
    color: white;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
    text-align: left;
    background: none;
    border: none;
    cursor: pointer;
    width: 100%;
    font-size: 0.9rem;
    transition: background-color 0.2s;
}

.action-item:hover {
    background-color: rgba(114, 137, 218, 0.2);
}

.download-btn {
    color: #43b581;
}

.delete-btn {
    color: #f04747;
}

.refresh-url-btn {
    color: #ffba08;
}

.refresh-notice {
    background-color: rgba(255, 186, 8, 0.1);
    color: #ffba08;
    padding: 0.5rem 1rem;
    margin-bottom: 1rem;
    border-radius: 4px;
    text-align: center;
    font-size: 0.9rem;
    border-left: 3px solid #ffba08;
}

.no-files {
    text-align: center;
    padding: 2rem;
    color: rgba(255, 255, 255, 0.6);
    font-style: italic;
}

/* Download section improvements */
.download-section {
    width: 100%;
    max-width: 100%;
    margin-top: 2rem;
    background: rgba(114, 137, 218, 0.1);
    backdrop-filter: blur(10px);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.3);
    border-left: 3px solid #7289da;
}

.download-section h2 {
    margin-bottom: 1rem;
    text-align: center;
    font-size: 1.75rem;
    color: #7289da;
}

.download-info {
    background: rgba(0, 0, 0, 0.2);
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
}

.download-info p {
    margin-bottom: 0.5rem;
    font-size: 1rem;
}

.download-info span {
    font-weight: 600;
    color: #7289da;
}

.download-controls {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 1rem;
}

.download-progress {
    margin: 1rem 0;
}

.download-progress-text {
    text-align: center;
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
    font-weight: 600;
}

.download-progress-bar {
    height: 15px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    overflow: hidden;
}

.download-progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(45deg, #7289da, #5865f2);
    transition: width 0.3s ease;
}

.download-status {
    text-align: center;
    min-height: 1.5em;
    margin-bottom: 1rem;
}

/* Config section styling */
.config-section {
    width: 100%;
    max-width: 500px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 1.5rem;
    border-radius: 15px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.3);
    margin-bottom: 2rem;
}

.config-section .input-group {
    margin-bottom: 1rem;
}

.config-section label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.config-section input[type="text"] {
    width: 100%;
    padding: 0.75rem;
    border-radius: 4px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    background-color: rgba(0, 0, 0, 0.2);
    color: white;
}

.config-section button {
    margin-top: 0.5rem;
    width: 100%;
}