/* ============================================================
   CalcTax 공통 스타일시트
   디자인 원칙: 모바일 우선(Mobile First), 금융/세금 특화
   메인 컬러: #2563EB, 포인트: #059669
   Breakpoints: 640px(sm), 768px(md), 1024px(lg)
   ============================================================ */

/* ── CSS 변수 ── */
:root {
    --color-primary:      #2563EB;
    --color-primary-dark: #1D4ED8;
    --color-result:       #059669;
    --color-bg:           #F8FAFC;
    --color-surface:      #FFFFFF;
    --color-border:       #E2E8F0;
    --color-text:         #1E293B;
    --color-muted:        #64748B;
    --color-error:        #DC2626;
    --radius:             8px;
    --shadow:             0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
    --shadow-md:          0 4px 6px rgba(0,0,0,.07), 0 2px 4px rgba(0,0,0,.06);
    --header-h:           56px;   /* 모바일 헤더 높이 */
    --tap-min:            44px;   /* 터치 최소 목표 크기 (iOS HIG 기준) */
}

/* ── 리셋 ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%; /* iOS 회전 시 폰트 자동 확대 방지 */
    scroll-behavior: smooth;
}
body {
    font-family: 'Noto Sans KR', sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    /* flex column으로 footer를 항상 하단에 고정 */
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    padding-top: var(--header-h);
}

/* 본문이 남은 공간을 모두 차지해 footer를 하단으로 밀어냄 */
.main-content { flex: 1 0 auto; }
.site-footer   { flex-shrink: 0; }
a  { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }
button { cursor: pointer; font-family: inherit; }

/* ── 레이아웃 컨테이너 ── */
.container {
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* ============================================================
   연도 선택 바
   ============================================================ */
.year-bar {
    background: #EFF6FF;
    border-bottom: 1px solid #BFDBFE;
    padding: .45rem 0;
}
.year-bar .container {
    display: flex;
    align-items: center;
    gap: .6rem;
}
.year-bar-label {
    font-size: .78rem;
    font-weight: 600;
    color: var(--color-primary);
    white-space: nowrap;
}
.year-btn-group {
    display: flex;
    gap: .25rem;
}
.year-btn {
    padding: .22rem .7rem;
    border: 1px solid #93C5FD;
    border-radius: 20px;
    background: #fff;
    font-family: inherit;
    font-size: .78rem;
    font-weight: 500;
    color: var(--color-muted);
    cursor: pointer;
    transition: all .15s;
    min-height: 28px;
}
.year-btn:hover:not(.active) {
    border-color: var(--color-primary);
    color: var(--color-primary);
}
.year-btn.active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: #fff;
    font-weight: 700;
}
.year-bar-effective {
    font-size: .73rem;
    color: var(--color-muted);
    margin-left: auto;   /* 오른쪽 정렬 */
    white-space: nowrap;
}

/* ============================================================
   헤더 & 모바일 네비게이션
   ============================================================ */
.site-header {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    position: fixed;     /* sticky → fixed: 모바일 주소창 숨김 대응 */
    top: 0;
    left: 0;
    right: 0;
    z-index: 200;
    box-shadow: var(--shadow);
}
.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-h);
}

/* 로고 */
.logo {
    display: flex;
    align-items: baseline;
    gap: .35rem;
    text-decoration: none;
    flex-shrink: 0;
}
.logo-text {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-primary);
}
.logo-sub {
    font-size: .7rem;
    color: var(--color-muted);
    display: none; /* 모바일: 숨김. 태블릿 이상에서 노출 */
}

/* 햄버거 버튼 (모바일 전용) */
.nav-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: var(--tap-min);
    height: var(--tap-min);
    background: none;
    border: none;
    padding: 8px;
    border-radius: var(--radius);
    transition: background .15s;
}
.nav-toggle:hover { background: var(--color-bg); }
.nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: transform .25s, opacity .25s;
}
/* 열림 상태: X 모양 */
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* 모바일 드롭다운 네비 */
.main-nav {
    display: none;         /* 기본: 숨김 */
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    z-index: 199;
    flex-direction: column;
    padding: .5rem 0;
}
.main-nav.open { display: flex; }
.main-nav a {
    display: block;
    padding: .8rem 1.25rem;
    font-size: .95rem;
    color: var(--color-text);
    border-bottom: 1px solid var(--color-border);
    min-height: var(--tap-min);
    display: flex;
    align-items: center;
    transition: background .1s;
}
.main-nav a:last-child { border-bottom: none; }
.main-nav a:hover, .main-nav a:active {
    background: var(--color-bg);
    text-decoration: none;
}

/* ============================================================
   본문
   ============================================================ */
.main-content { padding: 1.25rem 0 3rem; }

/* 계산기 페이지 공통 */
.calc-page { max-width: 900px; margin: 0 auto; padding: 0 1rem; }
.calc-page h1 {
    font-size: 1.45rem;
    font-weight: 700;
    margin-bottom: .5rem;
    line-height: 1.3;
    word-break: keep-all; /* 한글 단어 중간 줄바꿈 방지 */
}
.calc-page .page-desc {
    color: var(--color-muted);
    margin-bottom: 1.25rem;
    font-size: .9rem;
    word-break: keep-all;
}

/* ── 카드 ── */
.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.1rem;      /* 모바일: 좁게 */
    box-shadow: var(--shadow);
    margin-bottom: 1.25rem;
}

/* ── 폼 요소 ── */
.form-group { margin-bottom: 1rem; }
.form-group label {
    display: block;
    font-size: .875rem;
    font-weight: 500;
    margin-bottom: .35rem;
}
.form-group label.amount-label {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: .75rem;
}
.amount-preview {
    color: var(--color-primary);
    font-size: .78rem;
    font-weight: 700;
    white-space: nowrap;
    text-align: right;
}
/* 체크박스·라디오 제외하고 appearance 제거 (체크박스에 적용 시 클릭 불가) */
.form-group input:not([type="checkbox"]):not([type="radio"]),
.form-group select {
    width: 100%;
    padding: .75rem 1rem;     /* 터치 입력 높이 확보 */
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-family: inherit;
    font-size: 1rem;           /* iOS 자동 확대 방지 (16px 이상) */
    transition: border-color .15s;
    background: var(--color-surface);
    color: var(--color-text);
    -webkit-appearance: none;  /* iOS 기본 스타일 제거 */
    appearance: none;
}
.form-group input[type="number"]::-webkit-inner-spin-button,
.form-group input[type="number"]::-webkit-outer-spin-button {
    -webkit-appearance: none;  /* 숫자 input 화살표 제거 (모바일) */
}
.form-group select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%2364748B' d='M6 8L0 0h12z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    padding-right: 2.5rem;
}
.form-group input:not([type="checkbox"]):not([type="radio"]):focus,
.form-group select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37,99,235,.12);
}
/* 모바일: form-row 항상 1컬럼 */
.form-row {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0;
}
.form-hint {
    font-size: .78rem;
    color: var(--color-muted);
    margin-top: .3rem;
    word-break: keep-all;
}
.checkbox-group {
    display: flex;
    align-items: center;
    gap: .6rem;
    min-height: var(--tap-min);
}
.checkbox-group input[type="checkbox"] {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    accent-color: var(--color-primary);
}

/* ── 입력 유효성 에러 상태 ── */
.input-error {
    border-color: var(--color-error) !important;
    box-shadow: 0 0 0 3px rgba(220,38,38,.1) !important;
}
.error-msg {
    color: var(--color-error);
    font-size: .78rem;
    margin-top: .3rem;
    display: flex;
    align-items: center;
    gap: .25rem;
}
.error-msg::before { content: '⚠'; font-size: .75rem; }

/* ── 계산 일반 경고 (1년 미만 근무 등) ── */
.calc-warning {
    padding: .65rem .9rem;
    background: #FFF7ED;
    border: 1px solid #FED7AA;
    border-radius: var(--radius);
    color: #C2410C;
    font-size: .875rem;
    margin-bottom: .75rem;
    word-break: keep-all;
}

/* ── 계산 버튼 ── */
.btn-calc {
    width: 100%;
    padding: 1rem;           /* 터치 높이 확보 */
    background: var(--color-primary);
    color: #fff;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 700;
    transition: background .15s, transform .1s;
    margin-top: .5rem;
    -webkit-tap-highlight-color: transparent;
}
.btn-calc:hover  { background: var(--color-primary-dark); }
.btn-calc:active { transform: scale(.99); }

/* ── 결과 영역 ── */
.result-area        { display: none; }
.result-area.visible { display: block; }

.result-main {
    text-align: center;
    padding: 1.25rem 1rem;
    background: linear-gradient(135deg, #ecfdf5, #d1fae5);
    border: 1px solid #6ee7b7;
    border-radius: var(--radius);
    margin-bottom: 1rem;
}
.result-label { font-size: .85rem; color: var(--color-muted); margin-bottom: .25rem; }
.result-value { font-size: 1.9rem; font-weight: 700; color: var(--color-result); }
.result-sub   { font-size: .82rem; color: var(--color-muted); margin-top: .2rem; }

/* ── 결과 테이블: 모바일 가로 스크롤 ── */
.table-scroll {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch; /* iOS 관성 스크롤 */
}
.result-table {
    width: 100%;
    min-width: 320px;          /* 최소 너비 보장 */
    border-collapse: collapse;
    font-size: .875rem;
}
.result-table th,
.result-table td {
    padding: .55rem .65rem;
    border-bottom: 1px solid var(--color-border);
    text-align: left;
    white-space: nowrap;       /* 숫자 줄바꿈 방지 */
}
.result-table th {
    background: var(--color-bg);
    font-weight: 500;
    color: var(--color-muted);
    font-size: .8rem;
}
.result-table tr:last-child td { border-bottom: none; }
.result-table .amount  { text-align: right; font-weight: 500; }
.result-table .total td { font-weight: 700; }
.result-table .deduct  { color: var(--color-error); }

/* ── 복사 버튼 ── */
.btn-copy {
    padding: .5rem 1rem;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: .82rem;
    margin-top: .75rem;
    min-height: var(--tap-min);
}
.btn-copy:hover { background: var(--color-border); }

/* ── 광고 컨테이너 ── */
.ad-container {
    background: #F1F5F9;
    border: 1px dashed var(--color-border);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-muted);
    font-size: .78rem;
    margin: 1.25rem 0;
    overflow: hidden;
}
/* 반응형 광고 높이 */
.ad-banner-top    { min-height: 60px; }   /* 모바일: 320×50 또는 반응형 */
.ad-banner-middle { min-height: 200px; }  /* 모바일: 300×250 */
.ad-banner-bottom { min-height: 60px; }

/* ── SEO 설명 콘텐츠 ── */
.content-section { margin: 1.75rem 0; }
.content-section h2 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: .85rem;
    padding-bottom: .4rem;
    border-bottom: 2px solid var(--color-primary);
    display: inline-block;
    word-break: keep-all;
}
.content-section p,
.content-section li {
    color: var(--color-text);
    line-height: 1.8;
    margin-bottom: .5rem;
    word-break: keep-all;
}
.content-section ul,
.content-section ol { padding-left: 1.25rem; margin-bottom: 1rem; }

/* ── FAQ ── */
.faq-item { margin-bottom: 1rem; }
.faq-item dt {
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: .3rem;
    word-break: keep-all;
}
.faq-item dd { color: var(--color-text); line-height: 1.75; word-break: keep-all; }

/* ── 관련 계산기 링크 ── */
.related-links {
    display: grid;
    grid-template-columns: 1fr 1fr;   /* 모바일: 2컬럼 */
    gap: .6rem;
    margin-top: 1rem;
}
.related-links a {
    display: flex;
    align-items: center;
    padding: .7rem .85rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: .85rem;
    font-weight: 500;
    min-height: var(--tap-min);
    transition: border-color .15s, box-shadow .15s;
    word-break: keep-all;
}
.related-links a:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
    text-decoration: none;
}

/* ── 메인 홈 계산기 그리드 ── */
.calc-grid {
    display: grid;
    grid-template-columns: 1fr;  /* 모바일: 1컬럼 */
    gap: .85rem;
    margin-top: 1.25rem;
}
.calc-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.1rem;
    box-shadow: var(--shadow);
    display: block;
    text-decoration: none;
    transition: box-shadow .15s, border-color .15s;
    -webkit-tap-highlight-color: transparent;
}
.calc-card:hover  { box-shadow: var(--shadow-md); border-color: var(--color-primary); text-decoration: none; }
.calc-card:active { transform: scale(.99); }
.calc-card-title  { font-size: 1rem; font-weight: 700; color: var(--color-text); margin-bottom: .3rem; }
.calc-card-desc   { font-size: .83rem; color: var(--color-muted); line-height: 1.5; word-break: keep-all; }

/* ── 푸터 ── */
.site-footer {
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: 1.25rem 0;
    font-size: .82rem;
    color: var(--color-muted);
    text-align: center;
}
.site-footer p { margin-bottom: .35rem; }
.site-footer a  { color: var(--color-muted); min-height: var(--tap-min); display: inline-flex; align-items: center; }

/* ============================================================
   반응형 — 640px 이상 (큰 모바일 / 소형 태블릿)
   ============================================================ */
@media (min-width: 640px) {
    .form-row          { grid-template-columns: 1fr 1fr; gap: .85rem; }
    .calc-grid         { grid-template-columns: 1fr 1fr; }
    .result-value      { font-size: 2.2rem; }
    .ad-banner-top     { min-height: 90px; }
    .ad-banner-bottom  { min-height: 90px; }
}

/* ============================================================
   반응형 — 768px 이상 (태블릿)
   ============================================================ */
@media (min-width: 768px) {
    :root { --header-h: 64px; }

    /* 데스크탑 네비: 가로 배치, 햄버거 숨김 */
    .nav-toggle { display: none; }
    .main-nav {
        display: flex !important; /* open 클래스 무관하게 항상 표시 */
        position: static;
        flex-direction: row;
        border: none;
        box-shadow: none;
        padding: 0;
        gap: .2rem;
        background: transparent;
    }
    .main-nav a {
        padding: .4rem .75rem;
        font-size: .875rem;
        border-bottom: none;
        border-radius: var(--radius);
        min-height: auto;
    }
    .main-nav a:hover { background: var(--color-bg); }

    .logo-sub     { display: inline; }
    .calc-page h1 { font-size: 1.8rem; }
    .card         { padding: 1.5rem; }
    .result-value { font-size: 2.6rem; }
    .ad-banner-middle { min-height: 250px; }
    .calc-grid    { grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
}

/* ============================================================
   반응형 — 1024px 이상 (데스크탑)
   ============================================================ */
@media (min-width: 1024px) {
    .calc-page h1  { font-size: 2rem; }
    .result-value  { font-size: 2.8rem; }
    .btn-calc      { font-size: 1.1rem; }
}