:root {
    /* Dark theme (not pure black) */
    --bg-color: #1a1a2e;
    --container-bg: #16213e;
    --text-color: #e6e6e6;
    --secondary-text: #b3b3b3;
    --border-color: #2a3a5e;
    --highlight-bg: #2a3a5e;
    --button-bg: #4a6fa5;
    --button-hover: #3a5a8c;
    --match-count-bg: #3a5a8c;
    --match-count-text: #e6e6e6;
    --file-result-bg: #1f2c4e;
}

[data-theme="dark"] {
    /* Light theme (default) */
    --bg-color: #f5f5f5;
    --container-bg: white;
    --text-color: #333;
    --secondary-text: #666;
    --border-color: #eee;
    --highlight-bg: #f9f9f9;
    --button-bg: #007bff;
    --button-hover: #0056b3;
    --match-count-bg: #e1f5fe;
    --match-count-text: #0277bd;
    --file-result-bg: transparent;
}

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 20px;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: var(--container-bg);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
    transition: background-color 0.3s ease;
}

.theme-switch-wrapper {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    margin-bottom: 15px;
}

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

.theme-switch input {
    display: none;
}

.slider {
    background-color: #ccc;
    bottom: 0;
    cursor: pointer;
    left: 0;
    position: absolute;
    right: 0;
    top: 0;
    transition: .4s;
    border-radius: 24px;
}

.slider:before {
    background-color: #fff;
    bottom: 4px;
    content: "";
    height: 16px;
    left: 4px;
    position: absolute;
    transition: .4s;
    width: 16px;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: #4a6fa5;
}

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

.header-image {
    text-align: center;
    margin-bottom: 20px;
}

.header-image img {
    max-width: 100%;
    height: auto;
    max-height: 150px;
    display: block;
    margin: 0 auto;
}

h1 {
    color: var(--text-color);
    text-align: center;
    margin-top: 0;
}

form {
    display: flex;
    margin-bottom: 20px;
}

input[type="text"] {
    flex: 1;
    padding: 10px;
    font-size: 16px;
    border: 1px solid var(--border-color);
    border-radius: 4px 0 0 4px;
    background-color: var(--container-bg);
    color: var(--text-color);
}

button {
    padding: 10px 20px;
    background-color: var(--button-bg);
    color: white;
    border: none;
    border-radius: 0 4px 4px 0;
    cursor: pointer;
    font-size: 16px;
}

button:hover {
    background-color: var(--button-hover);
}

.results {
    margin-top: 20px;
}

.results h2 {
    color: var(--text-color);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
}

.results-stats {
    margin-bottom: 15px;
    font-style: italic;
    color: var(--secondary-text);
}

.file-result {
    margin-bottom: 25px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 15px;
    background-color: var(--file-result-bg);
}

.file-result h3 {
    margin-top: 0;
    margin-bottom: 10px;
    color: var(--text-color);
}

.matches-container {
    background-color: var(--highlight-bg);
    border-radius: 4px;
    padding: 10px;
    overflow-x: hidden;
    word-break: break-word;
}

.match-line {
    padding: 8px;
    margin-bottom: 5px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 8px;
}

.match-line:last-child {
    border-bottom: none;
}

.line-number {
    font-weight: bold;
    color: var(--secondary-text);
    margin-right: 0;
    min-width: 80px;
}

.line-content {
    flex-grow: 1;
    overflow-wrap: break-word;
    word-break: break-word;
    max-width: 100%;
    color: var(--text-color);
}

.match-count {
    background-color: var(--match-count-bg);
    color: var(--match-count-text);
    padding: 2px 6px;
    border-radius: 10px;
    font-size: 0.8em;
    margin-left: 0;
    white-space: nowrap;
}

.no-results {
    color: var(--secondary-text);
    font-style: italic;
    text-align: center;
    padding: 20px;
}