body {
    font-family: 'Roboto', sans-serif;
    margin: 0;
    padding: 0;
    transition: background 0.3s, color 0.3s;
}

/* Dark Mode (Default) */
body.dark-mode {
    background: linear-gradient(to bottom right, #1A252F, #2C3E50);
    color: #E0E6ED;
}

body.dark-mode .input-section,
body.dark-mode .markdown-section,
body.dark-mode .preview-section {
    background: #041121;
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.3);
}

body.dark-mode input[type="text"],
body.dark-mode input[type="file"] {
    background: #3A5063;
    color: #FFFFFF;
    border: 1px solid #4A6FA5;
}

body.dark-mode input[type="text"]:focus,
body.dark-mode input[type="file"]:focus {
    border-color: #A66F3A;
}

body.dark-mode button {
    background: linear-gradient(to right, #3498DB, #2C7DB2);
    box-shadow: inset 0 0 5px rgba(52, 152, 219, 0.3);
}

body.dark-mode button:hover {
    background: linear-gradient(to right, #2C7DB2, #3498DB);
    box-shadow: inset 0 0 8px rgba(52, 152, 219, 0.5);
}

body.dark-mode #downloadBtn {
    background: linear-gradient(to right, #8B5A2B, #7F4D1A);
    box-shadow: inset 0 0 5px rgba(139, 90, 43, 0.3);
}

body.dark-mode #downloadBtn:hover {
    background: linear-gradient(to right, #7F4D1A, #8B5A2B);
    box-shadow: inset 0 0 8px rgba(139, 90, 43, 0.5);
}

body.dark-mode textarea {
    background: #3A5063;
    color: #FFFFFF;
    border: 1px solid #4A6FA5;
}

body.dark-mode #output {
    background: #3A5063;
}

body.dark-mode #output h1, body.dark-mode #output h2, body.dark-mode #output h3 {
    color: #FFFFFF;
    font-weight: 500;
    letter-spacing: 0.5px;
}

body.dark-mode #output code,
body.dark-mode #output pre {
    background: #2C3E50;
}

body.dark-mode .spinner {
    border: 4px solid #2F4054;
    border-top: 4px solid #E0E6ED;
}

/* Light Mode */
body.light-mode {
    background: linear-gradient(to bottom right, #f0f4f8, #d9e2ec);
    color: #333;
}

body.light-mode .input-section,
body.light-mode .markdown-section,
body.light-mode .preview-section {
    background: white;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

body.light-mode input[type="text"],
body.light-mode input[type="file"] {
    background: white;
    color: #333;
    border: 1px solid #ccc;
}

body.light-mode input[type="text"]:focus,
body.light-mode input[type="file"]:focus {
    border-color: #4CAF50;
}

body.light-mode button {
    background: linear-gradient(to right, #4CAF50, #45a049);
}

body.light-mode button:hover {
    background: linear-gradient(to right, #45a049, #4CAF50);
}

body.light-mode #downloadBtn {
    background: linear-gradient(to right, #3498db, #2980b9);
}

body.light-mode #downloadBtn:hover {
    background: linear-gradient(to right, #2980b9, #3498db);
}

body.light-mode textarea {
    background: white;
    color: #333;
    border: 1px solid #ccc;
}

body.light-mode #output {
    background: white;
}

body.light-mode #output h1, body.light-mode #output h2, body.light-mode #output h3 {
    color: #333;
}

body.light-mode #output code,
body.light-mode #output pre {
    background: #f4f4f4;
}

body.light-mode .spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid #3498db;
}

/* Common Styles */
.container {
    max-width: 1200px;
    margin: 20px auto;
    padding: 20px;
    position: relative;
}

.input-section, .markdown-section, .preview-section {
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 20px;
    transition: background 0.3s, box-shadow 0.3s;
}

input[type="text"], input[type="file"] {
    width: 95%;
    padding: 10px;
    margin: 10px 0;
    border-radius: 5px;
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.1);
    transition: border-color 0.3s;
}

button {
    padding: 10px 20px;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    margin: 5px;
    transition: background 0.3s, transform 0.1s, box-shadow 0.3s;
}

button:active {
    transform: scale(0.97) translateY(2px);
    box-shadow: none;
}

.spinner {
    display: none;
    border-radius: 50%;
    width: 30px;
    height: 30px;
    animation: spin 1s linear infinite;
    margin: 20px auto;
}

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

.output-container {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
}

.markdown-section, .preview-section {
    flex: 1;
    min-width: 300px;
}

textarea {
    width: 95%;
    height: 400px; /* This will be dynamically adjusted by JavaScript */
    margin-top: 10px;
    padding: 10px;
    border-radius: 5px;
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.1);
    font-family: monospace;
    resize: vertical;
    transition: background 0.3s, color 0.3s, border 0.3s;
}

#output {
    margin-top: 10px;
    padding: 10px;
    max-height: 600px;
    overflow-y: auto;
    border-radius: 5px;
    border: 1px solid #4A6FA5;
    transition: background 0.3s, border 0.3s;
}

#output code {
    padding: 2px 4px;
    border-radius: 3px;
}

#output pre {
    padding: 10px;
    border-radius: 5px;
    overflow-x: auto;
}

.fade-in {
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; transform: scale(0.98); }
    to { opacity: 1; transform: scale(1.02); }
}

/* Toggle Switch */
.mode-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
    display: flex;
    align-items: center;
}

.mode-toggle label {
    margin-left: 10px;
    font-size: 14px;
    color: #E0E6ED;
}

.switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 24px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: #7F8C8D;
    transition: 0.3s;
    border-radius: 24px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background: #ECF0F1;
    transition: 0.3s;
    border-radius: 50%;
}

input:checked + .slider {
    background: #4CAF50;
}

input:checked + .slider:before {
    transform: translateX(26px);
}

/* Copy Button */
.copy-button {
    padding: 8px 16px;
    background: #3498DB;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    margin-left: 10px;
    transition: background 0.3s, transform 0.1s;
}

.copy-button:hover {
    background: #2C7DB2;
}

.copy-button:active {
    transform: scale(0.97) translateY(2px);
}