/* Basic Reset & Defaults */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-color: #f9fafb;
    --text-color: #333;
    --text-color-light: #555;
    --text-color-inverted: #ecf0f1;
    --header-bg: #2c3e50;
    --header-text: #ecf0f1;
    --header-subtitle: #bdc3c7;
    --header-border: #3498db;
    --card-bg: #fff;
    --card-shadow: rgba(0, 0, 0, 0.1);
    --card-shadow-light: rgba(0, 0, 0, 0.08);
    --input-bg: #fdfdfd;
    --input-border: #ddd;
    --input-focus-border: #3498db;
    --input-focus-shadow: rgba(52, 152, 219, 0.2);
    --btn-primary-bg: #3498db;
    --btn-primary-text: white;
    --btn-primary-hover-bg: #2980b9;
    --btn-secondary-bg: #ecf0f1;
    --btn-secondary-text: #2c3e50;
    --btn-secondary-border: #bdc3c7;
    --btn-secondary-hover-bg: #dfe4e7;
    --h2-color: #34495e;
    --h2-border: #e0e0e0;
    --link-color: #3498db;
    --link-hover-color: #2980b9;
    --footer-bg: #34495e;
    --footer-text: #bdc3c7;
    --footer-link: #ecf0f1;
    --error-bg: #f8d7da;
    --error-text: #721c24;
    --error-border: #f5c6cb;
    --faq-question-hover-bg: #f0f0f0;
    --faq-answer-bg: #f9f9f9;
    --icon-btn-border: var(--header-subtitle);
    --icon-btn-color: var(--header-subtitle);
    --icon-btn-hover-bg: var(--header-subtitle);
    --icon-btn-hover-color: var(--header-bg);
}

body.dark-mode {
    --bg-color: #1a1a1a;
    --text-color: #e0e0e0;
    --text-color-light: #b0b0b0;
    --text-color-inverted: #2c3e50;
    --header-bg: #1f2937;
    --header-text: #e5e7eb;
    --header-subtitle: #9ca3af;
    --header-border: #5fa8d3;
    --card-bg: #2d2d2d;
    --card-shadow: rgba(0, 0, 0, 0.3);
    --card-shadow-light: rgba(0, 0, 0, 0.2);
    --input-bg: #3a3a3a;
    --input-border: #555;
    --input-focus-border: #5fa8d3;
    --input-focus-shadow: rgba(95, 168, 211, 0.3);
    --btn-primary-bg: #5fa8d3;
    --btn-primary-text: #121212;
    --btn-primary-hover-bg: #4a8db3;
    --btn-secondary-bg: #4a4a4a;
    --btn-secondary-text: #e0e0e0;
    --btn-secondary-border: #666;
    --btn-secondary-hover-bg: #5a5a5a;
    --h2-color: #c0c0c0;
    --h2-border: #444;
    --link-color: #6fb8e4;
    --link-hover-color: #8bc4ec;
    --footer-bg: #1f2937;
    --footer-text: #9ca3af;
    --footer-link: #e5e7eb;
    --error-bg: #582c2c;
    --error-text: #f5c6cb;
    --error-border: #a04040;
    --faq-question-hover-bg: #383838;
    --faq-answer-bg: #333333;
    --icon-btn-border: var(--header-subtitle);
    --icon-btn-color: var(--header-subtitle);
    --icon-btn-hover-bg: var(--header-subtitle);
    --icon-btn-hover-color: var(--header-bg);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 10px 0;
}
.fullbleed-wrap {
  background-color: #1165ed;
}
.focus-in-expand {
	animation: focus-in-expand 1s cubic-bezier(0.250, 0.460, 0.450, 0.940) both;
}

.focus-in-expand-2 {
	animation: focus-in-expand 1s .5s cubic-bezier(0.250, 0.460, 0.450, 0.940) both;
}

.other-format-div {
  z-index: 5;
}

/* Header */
header {
    background-color: var(--header-bg);
    color: var(--header-text);
    border-bottom: 4px solid var(--header-border);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.header-content h1 {
    font-size: 2.2em;
    margin-bottom: 0.1em;
    color: var(--header-text);
    transition: color 0.3s ease;
}

.header-content .subtitle {
    font-size: 1em;
    color: var(--header-subtitle);
    margin-bottom: 10px;
    transition: color 0.3s ease;
}

.btn-icon { /* For dark mode toggle */
    background: transparent;
    border: 1px solid var(--icon-btn-border);
    color: var(--icon-btn-color);
    padding: 8px 10px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    transition: background-color 0.2s, color 0.2s, border-color 0.2s;
}

.btn-icon:hover {
    background-color: var(--icon-btn-hover-bg);
    color: var(--icon-btn-hover-color);
    border-color: var(--icon-btn-hover-bg);
}

.btn-icon svg {
    width: 20px;
    height: 20px;
}

/* Main Tool Area */
.tool-container {
    background-color: var(--card-bg);
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 4px 15px var(--card-shadow);
    margin-top: 30px;
    margin-bottom: 30px;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.io-panel {
    display: grid;
    grid-template-columns: 1fr;
    gap: 25px;
}

.input-area, .options-area, .output-area {
    display: flex;
    flex-direction: column;
}

.input-area h2, .options-area h2, .output-area h2 {
    font-size: 1.5em;
    color: var(--h2-color);
    margin-bottom: 15px;
    border-bottom: 2px solid var(--h2-border);
    padding-bottom: 8px;
    transition: color 0.3s ease, border-color 0.3s ease;
}

textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--input-border);
    border-radius: 5px;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.95em;
    background-color: var(--input-bg);
    color: var(--text-color);
    resize: vertical;
    min-height: 200px;
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

textarea::placeholder {
    color: var(--text-color-light);
    transition: color 0.3s ease;
}

textarea:focus {
    outline: none;
    border-color: var(--input-focus-border);
    box-shadow: 0 0 0 2px var(--input-focus-shadow);
}

/* Buttons */
.btn {
    padding: 10px 18px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1em;
    font-weight: 500;
    transition: background-color 0.2s ease, transform 0.1s ease, color 0.2s ease, border-color 0.2s ease;
}

.btn-primary {
    background-color: var(--btn-primary-bg);
    color: var(--btn-primary-text);
}
.btn-primary:hover {
    background-color: var(--btn-primary-hover-bg);
}

.btn-secondary {
    background-color: var(--btn-secondary-bg);
    color: var(--btn-secondary-text);
    border: 1px solid var(--btn-secondary-border);
}
.btn-secondary:hover {
    background-color: var(--btn-secondary-hover-bg);
}
.btn:active {
    transform: translateY(1px);
}

.file-actions, .output-actions {
    margin-top: 15px;
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

#csvFile {
    border: 1px solid var(--input-border);
    color: var(--text-color);
    padding: 8px;
    border-radius: 5px;
    flex-grow: 1;
    background-color: var(--input-bg); /* Ensure file input bg also changes */
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

/* Options Area */
.options-area label {
    margin-bottom: 5px;
    font-weight: 500;
    display: block;
    color: var(--text-color);
    transition: color 0.3s ease;
}

.options-area select,
.options-area input[type="text"] {
    padding: 8px;
    border: 1px solid var(--input-border);
    border-radius: 5px;
    background-color: var(--input-bg);
    color: var(--text-color);
    width: 100%;
    margin-bottom: 0;
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

.option-group {
    margin-bottom: 18px;
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 10px;
}
.checkbox-group input[type="checkbox"] {
    width: auto;
    margin-bottom: 0;
    accent-color: var(--btn-primary-bg); /* Styles the checkbox color */
}
.checkbox-group label {
    margin-bottom: 0;
    font-weight: normal;
}

/* Error Message */
.error-message {
    background-color: var(--error-bg);
    color: var(--error-text);
    border: 1px solid var(--error-border);
    padding: 15px;
    border-radius: 5px;
    margin-top: 20px;
    text-align: center;
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

/* Content Section */
.content-section {
    background-color: var(--card-bg);
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 2px 8px var(--card-shadow-light);
    margin-bottom: 30px;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.content-section h2 {
    font-size: 1.8em;
    color: var(--h2-color);
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--h2-border);
    transition: color 0.3s ease, border-color 0.3s ease;
}

.content-section p, .content-section li, .content-section dd {
    margin-bottom: 15px;
    color: var(--text-color-light);
    transition: color 0.3s ease;
}
.content-section ul, .content-section ol {
    margin-left: 25px;
    margin-bottom: 15px;
}
.content-section dl dt { /* Though we replaced dl with divs for FAQ, keep if used elsewhere */
    font-weight: bold;
    color: var(--text-color);
    margin-top: 10px;
    transition: color 0.3s ease;
}
.content-section a {
    color: var(--link-color);
    text-decoration: none;
    transition: color 0.2s;
}
.content-section a:hover {
    color: var(--link-hover-color);
    text-decoration: underline;
}

/* FAQ Styles */
.faq-container {
    margin-top: 20px;
}
.faq-item {
    border-bottom: 1px solid var(--input-border);
    margin-bottom: 10px;
    transition: border-color 0.3s ease;
}
.faq-item:last-child {
    border-bottom: none;
}
.faq-question {
    background-color: transparent;
    border: none;
    padding: 15px 0;
    width: 100%;
    text-align: left;
    font-size: 1.1em;
    font-weight: 600;
    color: var(--text-color);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background-color 0.2s, color 0.3s ease;
}
.faq-question:hover,
.faq-question:focus {
    /* background-color: var(--faq-question-hover-bg); */ /* Optional hover background */
    color: var(--link-hover-color); /* Highlight on hover */
    outline: none;
}
.faq-icon {
    font-size: 1.2em;
    font-weight: bold;
    transition: transform 0.2s ease-in-out;
    margin-left: 10px; /* Space from text */
}
.faq-answer {
    padding: 0px 15px 0px 15px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out, padding 0.3s ease-out;
    background-color: var(--faq-answer-bg);
    border-left: 3px solid var(--input-focus-border);
    border-radius: 0 0 4px 4px;
    margin-bottom: 10px; /* Space after open answer */
    transition: background-color 0.3s ease, border-color 0.3s ease;
}
.faq-answer p {
    margin-bottom: 0;
    padding: 15px 0; /* Add padding inside p for better spacing */
    color: var(--text-color-light);
    transition: color 0.3s ease;
}
.faq-item .faq-question[aria-expanded="true"] + .faq-answer {
    max-height: 500px; /* Adjust if answers are very long */
}
.faq-item .faq-question[aria-expanded="true"] .faq-icon {
    transform: rotate(45deg);
}

/* Footer */
footer {
    background-color: var(--footer-bg);
    color: var(--footer-text);
    text-align: center;
    padding: 20px 0;
    font-size: 0.9em;
    transition: background-color 0.3s ease, color 0.3s ease;
}
footer a {
    color: var(--footer-link);
    text-decoration: none;
    transition: color 0.2s;
}
footer a:hover {
    text-decoration: underline;
    color: var(--text-color-inverted);
}

/* Responsive Design */
@media (min-width: 768px) {
    .io-panel {
        grid-template-columns: 1fr 1fr;
        grid-template-rows: auto auto;
    }
    .input-area {
      grid-column: 1 / 2;
      grid-row: 1 / 3;
    }
    .options-area {
        grid-column: 2 / 3;
        grid-row: 1 / 2;
    }
    .output-area {
        grid-column: 2 / 3;
        grid-row: 2 / 3;
    }
    .input-area textarea, .output-area textarea {
        min-height: 350px;
    }
}

@media (max-width: 767px) { /* Adjust header for smaller screens */
    .header-content {
        flex-direction: column;
        align-items: flex-start;
        text-align: left;
    }
    .header-content h1 {
        font-size: 1.8em;
    }
    .header-content .subtitle {
        font-size: 0.9em;
    }
    .btn-icon { /* Dark mode toggle */
        margin-top: 10px;
        align-self: flex-end;
    }
}

@media (min-width: 1024px) {
    .header-content h1 {
        font-size: 2.5em; /* Larger title for desktop */
    }
}