:root {
    --bg-color: #F0F2F6;
    --card-bg: #FFFFFF;
    --text-primary: #1A1C1E;
    --text-secondary: #5F6368;
    --text-light: #9AA0A6;
    --border-color: #E2E4E8;
    --input-bg: #F8F9FA;
    --input-border: #DADCE0;
    --primary-color: #1A1C1E; /* 다크 네이비/블랙 계열 */
    --hover-color: #333639;
    --highlight-color: #E53E3E; /* 결과 강조 색상 (빨간색) */
    --focus-ring: rgba(26, 28, 30, 0.2);
    --border-radius-card: 16px;
    --border-radius-input: 10px;
    --border-radius-btn: 12px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Pretendard Variable', -apple-system, BlinkMacSystemFont, system-ui, Roboto, "Helvetica Neue", "Segoe UI", "Apple SD Gothic Neo", "Noto Sans KR", "Malgun Gothic", sans-serif;
    color: var(--text-primary);
    background-color: var(--bg-color);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

.calculator-container {
    max-width: 600px;
    margin: 40px auto;
    padding: 0 20px;
}

.calc-header {
    text-align: center;
    margin-bottom: 30px;
}

.calc-header h1 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 8px;
    letter-spacing: -0.5px;
}

.calc-header p {
    font-size: 15px;
    color: var(--text-secondary);
}

.calc-section {
    background-color: var(--card-bg);
    border-radius: var(--border-radius-card);
    padding: 30px;
    margin-bottom: 24px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.03);
}

.calc-section h2 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 8px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 12px;
}

.badge {
    font-size: 12px;
    font-weight: 500;
    padding: 4px 8px;
    border-radius: 4px;
}

.badge.required {
    background-color: #E8F0FE;
    color: #1967D2;
}

.badge.optional {
    background-color: #F1F3F4;
    color: #5F6368;
}

.section-desc {
    font-size: 14px;
    color: var(--text-secondary);
    margin: -10px 0 20px 0;
}

.form-group {
    margin-bottom: 24px;
}

.form-group:last-child {
    margin-bottom: 0;
}

label {
    display: block;
    font-size: 15px;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.doc-ref {
    font-size: 13px;
    color: #1967D2;
    font-weight: 400;
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

input[type="text"] {
    width: 100%;
    background-color: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: var(--border-radius-input);
    padding: 14px 40px 14px 16px;
    font-size: 16px;
    font-weight: 500;
    color: var(--text-primary);
    transition: all 0.2s ease;
    text-align: right;
    font-family: inherit;
}

input[type="text"]:focus {
    outline: none;
    border-color: var(--primary-color);
    background-color: #FFF;
    box-shadow: 0 0 0 3px var(--focus-ring);
}

input[type="text"]::placeholder {
    color: var(--text-light);
}

.currency {
    position: absolute;
    right: 16px;
    font-size: 15px;
    color: var(--text-secondary);
    pointer-events: none;
}

small {
    display: block;
    margin-top: 6px;
    font-size: 13px;
    color: var(--text-light);
}

/* 세부 경비 입력 영역 */
.expenses-group {
    background-color: #F8FAFC;
    padding: 20px;
    border-radius: var(--border-radius-input);
    border: 1px dashed var(--border-color);
}

.sub-inputs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 16px;
}

.sub-input-group label {
    font-size: 13px;
    margin-bottom: 4px;
}

.sub-label {
    display: block;
    font-size: 11px;
    color: var(--text-light);
    font-weight: 400;
}

.sub-input-group input {
    padding: 10px 32px 10px 12px;
    font-size: 14px;
}

.total-expense-display {
    text-align: right;
    font-size: 15px;
    padding-top: 12px;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.total-expense-display strong {
    color: var(--text-primary);
    font-size: 18px;
}

.primary-btn {
    width: 100%;
    background-color: var(--primary-color);
    color: #FFF;
    border: none;
    border-radius: var(--border-radius-btn);
    padding: 18px;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s ease;
    margin-bottom: 30px;
    font-family: inherit;
}

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

/* 결과 영역 */
.result-section {
    background-color: var(--card-bg);
    border-radius: var(--border-radius-card);
    padding: 30px;
    margin-bottom: 50px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.03);
    border: 2px solid var(--primary-color);
    animation: fadeIn 0.5s ease-out;
}

.result-section.hidden {
    display: none;
}

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

.result-section h2 {
    text-align: center;
    border-bottom: none;
    margin-bottom: 24px;
    font-size: 20px;
}

.result-card {
    background-color: var(--input-bg);
    border-radius: 12px;
    padding: 24px;
}

.result-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    font-size: 15px;
}

.result-row span {
    color: var(--text-secondary);
}

.result-row strong {
    font-weight: 600;
}

.deduction-row {
    color: #1967D2;
}

.deduction-row span, .deduction-row strong {
    color: #1967D2;
}

.result-card hr {
    border: none;
    border-top: 1px dashed var(--border-color);
    margin: 16px 0;
}

.final-tax strong {
    font-size: 18px;
}

.final-local-tax {
    font-size: 14px;
}

.result-total {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 2px solid var(--primary-color);
    font-size: 18px;
    font-weight: 600;
}

.result-total .highlight {
    font-size: 24px;
    color: var(--highlight-color);
}

.notice {
    margin-top: 20px;
    text-align: center;
    font-size: 13px;
    color: var(--text-light);
}

/* 모바일 대응 */
@media (max-width: 480px) {
    .sub-inputs {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    
    .calc-section {
        padding: 20px;
    }
}