/* Basic Reset & Font */
body, html {
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
    font-size: 16px; /* Base font size */
}

/* Light Theme (Default) */
body {
    background-color: #f4f7f9; /* Lighter, softer background */
    color: #333;
}

.container {
    max-width: 1400px; /* Wider container for side-by-side */
    margin: 30px auto;
    padding: 0 30px; /* Padding on sides */
    box-sizing: border-box;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 1px solid #e0e0e0;
    gap: 15px; /* Add gap for spacing between logo, title, controls */
}

.logo {
    max-height: 100px; /* Control logo size - increased */
    width: auto;
    display: block; /* Prevents extra space below image */
}

.title-area {
    flex-grow: 1; /* Allow title area to take available space */
    text-align: left; /* Align text to the left */
}

h1 {
    margin: 0;
    color: #2c3e50;
    font-weight: 600;
    font-size: 1.8rem;
    transition: color 0.3s ease;
    border-bottom-color: #34495e;
}

.sub-heading {
    margin: 0;
    font-size: 0.95rem;
    color: #5a6a7b;
    font-weight: 400;
    line-height: 1.2;
}

.controls {
    display: flex;
    gap: 15px; /* Space between buttons */
}

button {
    padding: 10px 22px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 500;
    transition: background-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease, transform 0.1s ease;
    display: inline-flex; /* Align icon and text if needed */
    align-items: center;
    justify-content: center;
}

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

#generate-pdf {
    background-color: #3498db; /* Brighter blue */
    color: white;
}

#generate-pdf:hover {
    background-color: #2980b9;
    box-shadow: 0 3px 6px rgba(52, 152, 219, 0.3);
}

#toggle-theme {
    background-color: #ecf0f1; /* Light gray */
    color: #34495e;
    padding: 8px; /* Make it more square for the icon */
    width: 40px;
    height: 40px;
    border: 1px solid #bdc3c7;
}

#toggle-theme:hover {
    background-color: #dfe4e6;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* Side-by-side layout */
.editor-preview-wrapper {
    display: flex;
    gap: 30px; /* Space between editor and preview */
    min-height: calc(100vh - 150px); /* Adjust based on header/footer height */
}

textarea, .preview {
    flex: 1; /* Each takes half the space */
    height: auto; /* Override fixed height */
    min-height: 500px; /* Minimum height */
    padding: 20px;
    border: 1px solid #dce1e6;
    border-radius: 6px;
    font-size: 0.95rem;
    box-sizing: border-box;
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
    background-color: #ffffff;
}

textarea {
    font-family: Menlo, Monaco, Consolas, "Courier New", monospace;
    resize: none; /* Disable resizing if using flex height */
    line-height: 1.5;
}

.preview {
    background-color: #ffffff; /* Keep preview distinct */
    overflow-y: auto; /* Allow scrolling */
    overflow-wrap: break-word;
    word-wrap: break-word;
}

/* Markdown Content Styling (Slight adjustments) */
.markdown-body {
    color: #333;
    transition: color 0.3s ease;
}

.markdown-body h1, .markdown-body h2, .markdown-body h3 {
    margin-top: 1.2em;
    margin-bottom: 0.6em;
    font-weight: 600;
    color: #2c3e50;
    border-bottom: 1px solid #eee;
    padding-bottom: 0.3em;
}
.markdown-body h1 { font-size: 1.8em; }
.markdown-body h2 { font-size: 1.5em; }
.markdown-body h3 { font-size: 1.25em; }

.markdown-body p {
    margin-bottom: 1em;
}
.markdown-body code {
    background-color: #eef1f3;
    padding: .2em .4em;
    margin: 0 2px;
    font-size: 88%;
    border-radius: 4px;
    font-family: Menlo, Monaco, Consolas, "Courier New", monospace;
}
.markdown-body pre {
    background-color: #eef1f3;
    padding: 15px;
    overflow: auto;
    line-height: 1.45;
    border-radius: 5px;
    margin: 1em 0;
}
.markdown-body pre code {
    background-color: transparent;
    padding: 0;
    margin: 0;
    font-size: 100%;
    border-radius: 0;
}
.markdown-body blockquote {
    margin: 1em 0 1em 0;
    padding: 0 1em;
    color: #6a737d;
    border-left: .25em solid #dfe2e5;
}
.markdown-body ul, .markdown-body ol {
    padding-left: 2em;
    margin-bottom: 1em;
}

/* Table Styles */
.markdown-body table {
    border-collapse: collapse;
    width: 100%;
    margin-bottom: 1em;
    border: 1px solid #ccc; /* Slightly darker border */
}
.markdown-body th, .markdown-body td {
    border: 1px solid #ccc;
    padding: 10px 14px;
    line-height: 1.4;
    text-align: left;
}
.markdown-body th {
    background-color: #f0f3f5;
    font-weight: 600;
}

/* --- Theme Icon CSS (Sun/Moon) --- */
.theme-icon {
    display: inline-block;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    position: relative;
    transition: transform 0.3s ease, background-color 0.3s ease, box-shadow 0.3s ease;
}

/* Sun Icon (Default - Light Mode) */
.theme-icon {
    background-color: #f39c12; /* Sun color */
    box-shadow: 0 0 5px rgba(243, 156, 18, 0.7);
}

/* Moon Icon (Dark Mode) */
body.dark-mode .theme-icon {
    background-color: #bdc3c7; /* Moon color */
    box-shadow: inset -3px 2px 0px 1px #8e959a; /* Crescent shape */
    transform: rotate(-30deg);
}


/* --- Dark Theme --- */
body.dark-mode {
    background-color: #2c3e50; /* Dark blue-gray background */
    color: #ecf0f1;
}

body.dark-mode .header {
    border-bottom-color: #34495e;
}

body.dark-mode h1 {
    color: #ecf0f1;
}

body.dark-mode button#generate-pdf {
    background-color: #3498db;
    color: white;
}

body.dark-mode button#generate-pdf:hover {
    background-color: #5dade2;
}

body.dark-mode button#toggle-theme {
    background-color: #34495e; /* Darker gray */
    color: #ecf0f1;
    border-color: #4a6174;
}

body.dark-mode button#toggle-theme:hover {
    background-color: #4a6174;
}

body.dark-mode textarea,
body.dark-mode .preview {
    background-color: #34495e; /* Match toggle button */
    color: #ecf0f1;
    border-color: #4a6174;
}

/* Dark Mode Markdown Content Styling */
body.dark-mode .markdown-body {
    color: #ecf0f1;
}
body.dark-mode .markdown-body h1, body.dark-mode .markdown-body h2, body.dark-mode .markdown-body h3 {
    color: #ecf0f1;
    border-bottom-color: #4a6174;
}
body.dark-mode .markdown-body code {
    background-color: #2c3e50; /* Slightly darker code background */
}
body.dark-mode .markdown-body pre {
    background-color: #2c3e50;
}
body.dark-mode .markdown-body blockquote {
    color: #bdc3c7; /* Lighter blockquote text */
    border-left-color: #4a6174;
}
/* Dark Mode Table Styles */
body.dark-mode .markdown-body table {
    border: 1px solid #4a6174;
}
body.dark-mode .markdown-body th,
body.dark-mode .markdown-body td {
    border: 1px solid #4a6174;
}
body.dark-mode .markdown-body th {
    background-color: #4a6174; /* Darker header background */
}

/* Footer Styling */
footer {
    text-align: center;
    padding: 20px 0;
    margin-top: 30px;
    font-size: 0.9rem;
    color: #7f8c8d;
    border-top: 1px solid #e0e0e0;
    transition: color 0.3s ease, border-top-color 0.3s ease;
}

footer a {
    color: #3498db;
    text-decoration: none;
    transition: color 0.2s ease;
}

footer a:hover {
    color: #2980b9;
}

/* Dark Mode Footer */
body.dark-mode footer {
    color: #95a5a6;
    border-top-color: #34495e;
}

body.dark-mode footer a {
    color: #5dade2;
}

body.dark-mode footer a:hover {
    color: #8ecae6;
}

/* Responsive adjustments */
@media (max-width: 900px) { /* Stack below 900px */
    .editor-preview-wrapper {
        flex-direction: column;
    }
    textarea, .preview {
        min-height: 300px; /* Adjust height for stacked view */
    }
}

@media (max-width: 600px) {
    .container {
        padding: 0 15px;
        margin: 15px auto;
    }
    .header {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
        padding-bottom: 10px;
        margin-bottom: 15px;
    }
    h1 {
        font-size: 1.6rem;
    }
    .controls {
        width: 100%;
        justify-content: space-between;
    }
     #toggle-theme {
        /* Ensure icon button doesn't take too much space */
     }
     #generate-pdf {
        flex-grow: 1; /* Allow generate button to grow */
        margin-right: 10px;
     }
    textarea, .preview {
        min-height: 250px;
    }
}