@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+KR:wght@400;500;700&display=swap');

:root {
    --bg-color: #1e1e2f;
    --card-color: #2a2a40;
    --text-color: #e0e0e0;
    --text-muted: #a0a0b0;
    --primary-color: #007bff;
    --primary-hover: #0056b3;
    --border-color: #40405a;
    --input-bg: #1a1a2e;
}

body {
    font-family: 'Noto Sans KR', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
}

.calculator-container {
    width: 100%;
    max-width: 800px;
    background-color: var(--card-color);
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    overflow: hidden;
}

h1 {
    text-align: center;
    background-color: var(--primary-color);
    color: white;
    padding: 20px;
    margin: 0;
}

h3 {
    color: var(--text-color);
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 10px;
    margin-top: 0;
}

/* 탭 스타일 */
.tabs {
    display: flex;
    background-color: var(--bg-color);
    border-bottom: 2px solid var(--border-color);
}

.tab-link {
    background-color: transparent;
    border: none;
    color: var(--text-muted);
    padding: 14px 20px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    border-bottom: 3px solid transparent;
}

.tab-link:hover {
    color: var(--text-color);
}

.tab-link.active {
    color: var(--primary-color);
    border-bottom: 3px solid var(--primary-color);
}

.tab-content {
    padding: 25px;
    display: none; /* JS가 로드되기 전까지 숨김 */
}

.tab-content.active {
    display: block; /* JS가 로드된 후 활성화 */
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* 폼 그리드 */
.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    margin-bottom: 20px;
}

.input-group {
    display: flex;
    flex-direction: column;
}

.input-group label {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 8px;
    font-weight: 500;
}

input[type="number"], select {
    width: 100%;
    padding: 12px;
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-color);
    font-size: 15px;
    box-sizing: border-box; /* 패딩 포함 크기 계산 */
}

input[readonly] {
    background-color: #3a3a50;
    cursor: not-allowed;
    color: var(--text-muted);
}

/* 버튼 */
button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 20px;
    font-size: 16px;
    font-weight: 700;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    margin-right: 10px;
}

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

.button-group {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 20px;
}

hr {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 25px 0;
}

/* 결과 박스 */
.result-box {
    background-color: var(--input-bg);
    border: 1px dashed var(--border-color);
    border-radius: 6px;
    padding: 20px;
    margin-top: 20px;
    font-size: 18px;
    font-weight: 500;
    line-height: 1.6;
}

.result-box p {
    margin: 0 0 10px 0;
}

.note {
    background-color: #2c2c42;
    border-left: 4px solid #f0ad4e;
    padding: 15px;
    border-radius: 4px;
    color: #e0e0e0;
    font-size: 14px;
    line-height: 1.6;
    margin-bottom: 20px;
}