/* CSS 변수를 사용하여 색상 및 스타일 관리 */
:root {
    --bg-color: #f4f7f9;
    --panel-bg-color: #ffffff;
    --text-color: #333333;
    --primary-color: #007bff;
    --primary-hover-color: #0056b3;
    --border-color: #dde4e9;
    --input-bg-color: #f9fafb;
    --font-family: 'Helvetica Neue', Arial, sans-serif;
    --box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

body {
    margin: 0;
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 30px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 20px;
}

h1 {
    color: var(--primary-color);
}

.main-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto auto;
    grid-template-areas:
        "input controls"
        "output output";
    gap: 20px;
}

.panel {
    background-color: var(--panel-bg-color);
    border-radius: 8px;
    padding: 20px;
    box-shadow: var(--box-shadow);
}

.input-panel { grid-area: input; }
.controls-panel { grid-area: controls; }
.output-panel { grid-area: output; }

h2 {
    margin-top: 0;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
    margin-bottom: 20px;
    font-size: 1.2rem;
}

textarea {
    width: 100%;
    box-sizing: border-box;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 10px;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.95rem;
    background-color: var(--input-bg-color);
    resize: vertical;
}

textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.2);
}

.controls-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 10px;
}

.control-btn {
    padding: 10px 15px;
    border: 1px solid var(--primary-color);
    background-color: transparent;
    color: var(--primary-color);
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s ease-in-out;
    text-align: center;
    font-weight: 500;
}

.control-btn:hover {
    background-color: var(--primary-color);
    color: white;
}

#extra-inputs-container {
    margin-top: 20px;
}

#extra-inputs-container .input-group {
    display: none; /* 기본적으로 숨김 */
    margin-bottom: 10px;
    background-color: #f9f9f9;
    padding: 15px;
    border-radius: 5px;
}

.input-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
    font-size: 0.9rem;
}

.input-group .small-input {
    width: calc(100% - 20px);
    padding: 8px 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
}

.output-controls {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
    flex-wrap: wrap;
}

.output-controls button {
    padding: 8px 15px;
    border: 1px solid var(--border-color);
    background-color: #e9ecef;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 500;
}
.output-controls button:hover {
    background-color: #d1d9e0;
}

#download-csv-btn {
    border-color: #28a745;
    background-color: #28a745;
    color: white;
}

#download-csv-btn:hover {
    background-color: #218838;
    border-color: #1e7e34;
}

.function-description {
    color: #555;
    background-color: #f8f9fa;
    border-left: 3px solid var(--primary-color);
    padding: 10px 15px;
    margin-top: 0;
    margin-bottom: 20px;
    font-size: 0.9rem;
    min-height: 1.2em; /* 설명이 바뀔 때 높이가 변하는 것을 방지 */
    transition: background-color 0.3s;
}

.output-format-selector {
    margin-bottom: 15px;
    padding: 10px;
    background-color: #f8f9fa;
    border-radius: 4px;
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.output-format-selector label {
    font-weight: 500;
    font-size: 0.9rem;
}

.output-format-selector input[type="radio"] {
    margin-right: 5px;
}

#html-output {
    display: none; /* 기본적으로 숨김 */
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 15px;
    margin-top: 15px;
    overflow-x: auto;
}

#html-output table {
    width: 100%;
    border-collapse: collapse;
}

#html-output th, #html-output td {
    border: 1px solid var(--border-color);
    padding: 8px 12px;
    text-align: left;
}

#html-output th {
    background-color: #f2f2f2;
}

@media (max-width: 900px) {
    .main-content {
        grid-template-columns: 1fr;
        grid-template-areas:
            "input"
            "controls"
            "output";
    }
}