/* 부가세 계산기 CSS - 최적화 및 가이드 수정 버전 */

:root {
    --primary-color: #0d6efd;
    --primary-hover: #0b5ed7;
    --secondary-color: #6c757d;
    --success-color: #198754;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fb;
    --bg-tertiary: #f9fafb;
    --text-primary: #333333;
    --text-secondary: #6b7280;
    --text-tertiary: #4b5563;
    --border-primary: #e5e7eb;
    --border-secondary: #d1d5db;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 30px rgba(0,0,0,0.1);
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
    --global-nav-bg: #1e293b;
    --global-nav-text: #ffffff;
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    font-size: 16px;
}

/* GPU 가속화 */
.calculator-card, .guide-wrapper, .global-nav {
    transform: translateZ(0);
    -webkit-transform: translateZ(0);
    will-change: transform;
}

/* 글로벌 네비게이션 수정 */
.global-nav {
    background: var(--global-nav-bg);
    color: var(--global-nav-text);
    padding: 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.global-nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    padding: 0 1.5rem;
    height: 56px;
}

.nav-left {
    display: flex;
    align-items: center;
    gap: 0;
}

.nav-brand {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--global-nav-text);
    text-decoration: none;
    margin-right: 2rem;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 0;
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-menu li {
    position: relative;
}

.nav-menu a {
    color: var(--global-nav-text);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    padding: 1rem 1.5rem;
    display: block;
    transition: all var(--transition-base);
    border-left: 1px solid rgba(255,255,255,0.1);
}

.nav-menu li:first-child a {
    border-left: none;
}

.nav-menu a:hover {
    background: rgba(255,255,255,0.1);
}

.nav-menu .active {
    background: rgba(255,255,255,0.15);
    font-weight: 600;
}

.nav-dropdown {
    position: relative;
}

.nav-dropdown-content {
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--bg-primary);
    border: 1px solid var(--border-primary);
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    min-width: 200px;
    z-index: 1001;
    display: none;
}

.nav-dropdown:hover .nav-dropdown-content {
    display: block;
}

.nav-dropdown-content a {
    color: var(--text-primary);
    padding: 0.75rem 1rem;
    border: none;
    border-bottom: 1px solid var(--border-primary);
}

.nav-dropdown-content a:hover {
    background: var(--bg-tertiary);
}

.nav-dropdown-content a:last-child {
    border-bottom: none;
}

/* 브레드크럼 */
.breadcrumb {
    background: var(--bg-primary);
    padding: 0.5rem 0;
    font-size: 0.75rem;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-primary);
}

.breadcrumb-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.breadcrumb a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-base);
}

.breadcrumb a:hover {
    color: var(--primary-color);
}

.breadcrumb-separator {
    margin: 0 0.5rem;
    color: var(--text-secondary);
}

/* 메인 타이틀 섹션 추가 */
.main-title-section {
    background: var(--bg-primary);
    padding: 2.5rem 0;
    border-bottom: 1px solid var(--border-primary);
}

.main-title-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
    text-align: center;
}

.main-title {
    font-size: 2.25rem;
    font-weight: 800;
    color: var(--text-primary);
    margin: 0 0 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
}

.title-icon {
    font-size: 2.5rem;
    display: inline-block;
    animation: bounce 2s infinite;
}

.main-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin: 0;
    font-weight: 500;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

/* 목차 스타일 */
.table-of-contents {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-primary);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.toc-container h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.toc-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 0.75rem;
}

.toc-list li {
    display: flex;
}

.toc-list a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    padding: 0.5rem 1rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-primary);
    border-radius: 6px;
    transition: all var(--transition-base);
    display: block;
    width: 100%;
}

.toc-list a:hover {
    color: var(--primary-color);
    border-color: var(--primary-color);
    background: #f0f7ff;
}

/* 메인 레이아웃 */
.main-wrapper {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    gap: 2rem;
    padding: 2rem 1.5rem;
}

.calculator-wrapper {
    width: 400px;
    flex-shrink: 0;
    position: sticky;
    top: 80px;
    max-height: calc(100vh - 100px);
}

.calculator-card {
    background: var(--bg-primary);
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    height: calc(100vh - 100px);
    display: flex;
    flex-direction: column;
}

/* 계산기 헤더 - 프로필 추가 */
.calculator-header {
    background: var(--bg-primary);
    padding: 1.5rem;
    text-align: center;
    border-bottom: 1px solid var(--border-primary);
}

.calculator-header.compact {
    display: flex;  
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem;
}

/* 작성자 정보 (왼쪽) */
.author-info {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.author-avatar {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    overflow: hidden;
    background: var(--bg-tertiary);
    border: 2px solid var(--border-primary);
    flex-shrink: 0;
}

.author-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.avatar-fallback {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #f3f4f6;
    color: #6b7280;
    font-size: 14px;
}

.avatar-fallback.initial {
    background: #3b82f6;
    color: white;
    font-weight: 700;
    font-size: 12px;
}

.author-name {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* 업데이트 날짜 (오른쪽) */
.update-badge {
    font-size: 0.75rem;
    color: var(--text-secondary);
    background: var(--bg-tertiary);
    padding: 0.375rem 0.75rem;
    border-radius: 20px;
    border: 1px solid var(--border-primary);
    font-weight: 500;
    white-space: nowrap;
    cursor: default;
    transition: all var(--transition-base);
}

.update-badge:hover {
    background: var(--bg-secondary);
    border-color: var(--border-secondary);
}

.calculator-header h2 {
    font-size: 1.375rem;
    font-weight: 700;
    margin: 0;
}

.calculator-body {
    background: var(--bg-primary);
    padding: 1rem;
    overflow-y: auto;
    flex: 1;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    scrollbar-color: var(--border-secondary) var(--bg-tertiary);
    will-change: scroll-position;
}

.calculator-body::-webkit-scrollbar {
    width: 6px;
}

.calculator-body::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
    border-radius: 3px;
}

.calculator-body::-webkit-scrollbar-thumb {
    background: var(--border-secondary);
    border-radius: 3px;
}

.calculator-body::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* 탭 스타일 */
.calculator-tabs {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0;
    margin-bottom: 1.5rem;
    background: none;
    padding: 0;
    border-bottom: 1px solid var(--border-primary);
}

.tab-button {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 0.25rem;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    gap: 2px;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.tab-button:hover {
    background: var(--bg-tertiary);
}

.tab-button.active {
    background: none;
}

.tab-button.active .tab-text-top {
    color: var(--primary-color);
    font-weight: 800;
}

.tab-button.active .tab-text-bottom {
    color: var(--primary-color);
}

.tab-button.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary-color);
}

.tab-text-top {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
}

.tab-text-bottom {
    font-size: 0.8125rem;
    font-weight: 400;
    color: var(--text-secondary);
}

/* 폼 스타일 */
.form-row, .form-row-group {
    margin-bottom: 1.25rem;
}

.form-row-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.form-col {
    display: flex;
    flex-direction: column;
}

label {
    display: block;
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

input[data-type="decimal"],
input[data-type="number"],
input[type="text"],
select {
    width: 100%;
    padding: 0.75rem;
    font-size: 1rem;
    font-weight: 500;
    border: 1px solid var(--border-primary);
    border-radius: 6px;
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: border-color var(--transition-base);
    height: 44px;
    -webkit-appearance: none;
    appearance: none;
    touch-action: manipulation;
}

/* placeholder 스타일 수정 - 더 작고 흐리게 */
input::placeholder {
    font-size: 0.875rem;
    color: #c0c0c0;
    opacity: 0.8;
    font-weight: 400;
}

select {
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 0.7rem center;
    background-size: 1.2em;
    padding-right: 2.5rem;
}

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

.input-with-unit input {
    padding-right: 3.5rem;
}

.unit-inline {
    position: absolute;
    right: 1rem;
    color: var(--text-secondary);
    font-weight: 400;
    pointer-events: none;
}

input:focus, select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(13, 110, 253, 0.25);
}

.help-text {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
    display: block;
}

.error-message {
    color: var(--danger-color);
    font-size: 0.75rem;
    margin-top: 0.25rem;
    display: block;
}

/* 양방향 계산 안내 추가 - 한 줄로 표시 */
.auto-calc-notice {
    background: #e3f2fd;
    border: 1px solid #1976d2;
    border-radius: 6px;
    padding: 0.75rem 1rem;
    margin-bottom: 1rem;
    font-size: 0.8125rem;
    color: #1565c0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    white-space: nowrap;
}

/* 툴팁 */
.tooltip-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    margin-left: 5px;
    background: #e3f2fd;
    color: #1976d2;
    border-radius: 50%;
    font-size: 12px;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition-fast);
    -webkit-tap-highlight-color: transparent;
}

.tooltip-icon:hover {
    background: #1976d2;
    color: #fff;
}

.tooltip-content {
    margin-top: 5px;
    padding: 8px 12px;
    background: #f5f5f5;
    border-left: 3px solid #1976d2;
    font-size: 13px;
    color: #666;
    border-radius: 4px;
    line-height: 1.6;
}

/* 아코디언 */
.accordion-wrapper {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1.25rem;
}

.accordion-button {
    padding: 0.75rem 1rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-primary);
    border-radius: 6px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    transition: all var(--transition-base);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    flex: 1;
}

.accordion-button.half-width {
    flex: none;
    width: auto;
    min-width: 160px;
}

.dotted-line {
    flex: 1;
    text-align: center;
    color: var(--border-secondary);
    font-size: 0.875rem;
    overflow: hidden;
    white-space: nowrap;
}

.accordion-button:hover {
    background: var(--bg-secondary);
    border-color: var(--primary-color);
}

.accordion-icon {
    transition: transform var(--transition-base);
    margin-left: 0.5rem;
}

.accordion-content {
    margin-top: 0.75rem;
    padding: 1rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-primary);
    border-radius: 6px;
    width: 100%;
}

.discount-section {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.discount-title {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 0.75rem;
    background: #e3f2fd;
    padding: 0.5rem 0.75rem;
    border-radius: 4px;
}

/* 옵션 그룹 스타일 */
.option-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.option-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.option-title input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    flex-shrink: 0;
}

.option-title label {
    margin: 0;
    cursor: pointer;
    font-weight: 600;
}

.rate-input {
    width: 60px;
    padding: 0.375rem 0.5rem;
    height: 32px;
    font-size: 0.875rem;
    text-align: center;
}

.unit-percent {
    color: var(--text-secondary);
    font-weight: 400;
}

/* 라디오 그룹, 체크박스 그룹 */
.radio-group, .checkbox-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.radio-item, .checkbox-item {
    display: flex;
    align-items: center;
    padding: 0.625rem 0.75rem;
    border: 1px solid var(--border-primary);
    border-radius: 6px;
    cursor: pointer;
    transition: all var(--transition-base);
    background: var(--bg-primary);
    -webkit-tap-highlight-color: transparent;
}

.radio-item:hover, .checkbox-item:hover {
    background: #f0f4f8;
    border-color: var(--primary-color);
}

.radio-item input[type="radio"],
.checkbox-item input[type="checkbox"] {
    margin-right: 0.75rem;
    width: 18px;
    height: 18px;
    cursor: pointer;
    flex-shrink: 0;
}

.radio-item input[type="radio"]:checked + span,
.checkbox-item input[type="checkbox"]:checked + span {
    color: var(--primary-color);
    font-weight: 600;
}

/* PC용 체크박스/라디오 appearance 속성 */
.option-group input[type="checkbox"],
.option-title input[type="checkbox"],
#withholding-check,
#cardfee-check,
#reverse-calc-check,
#batch-withholding-check,
#batch-cardfee-check {
    -webkit-appearance: checkbox;
    -moz-appearance: checkbox;
    appearance: checkbox;
}

.radio-group input[type="radio"],
.radio-item input[type="radio"],
input[name="withholding-rate"],
input[name="batch-withholding-rate"] {
    -webkit-appearance: radio;
    -moz-appearance: radio;
    appearance: radio;
}

/* 헬퍼 박스 */
.link-btn {
    background: none;
    border: none;
    color: var(--primary-color);
    padding: 0.5rem 0;
    font-size: 0.875rem;
    cursor: pointer;
    text-align: left;
    transition: color var(--transition-base);
    -webkit-tap-highlight-color: transparent;
    margin-top: 8px;
    margin-bottom: 15px;
}

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

.helper-box {
    margin: 1rem 0;
    padding: 1rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-primary);
    border-radius: 6px;
}

.apply-btn {
    margin-top: 0.75rem;
    padding: 0.5rem 1rem;
    background: var(--primary-color);
    color: #fff;
    border: none;
    border-radius: 4px;
    font-size: 0.875rem;
    cursor: pointer;
    transition: background var(--transition-base);
    -webkit-tap-highlight-color: transparent;
}

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

.apply-btn:active {
    transform: scale(0.98);
}

.appliance-checkboxes, .discount-checkboxes {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

/* 버튼 그리드 */
.button-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 1fr 1fr;
    grid-template-areas: 
        "share reset"
        "share calculate";
    gap: 8px;
    margin-top: 1.5rem;
    height: 90px;
}

.button-grid-bottom {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin-top: 1.5rem;
}

.button-grid-bottom .share-btn,
.button-grid-bottom .reset-btn {
    grid-area: unset;
}

.btn {
    border: 1px solid var(--border-primary);
    border-radius: 6px;
    background: var(--bg-primary);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.875rem;
    font-weight: 500;
    gap: 8px;
    padding: 0.75rem 1rem;
    min-height: 44px;
    font-family: inherit;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.btn:hover {
    border-color: var(--border-secondary);
    background: var(--bg-tertiary);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.btn svg {
    width: 16px;
    height: 16px;
}

.share-btn {
    grid-area: share;
    background: #fff7ed;
    border-color: #fed7aa;
    color: #ea580c;
}

.share-btn:hover {
    background: #ffedd5;
    border-color: #fdba74;
}

.calculate-btn {
    grid-area: calculate;
    background: var(--primary-color);
    color: #fff;
    border-color: var(--primary-color);
    font-weight: 600;
}

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

.reset-btn {
    grid-area: reset;
}

/* 결과 영역 */
.result-container {
    margin-top: 1rem;
}

.result-card {
    background: var(--bg-tertiary);
    border-radius: 12px;
    padding: 1rem;
    border: 1px solid var(--border-primary);
    margin-bottom: 0.75rem;
}

.result-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    text-align: center;
    color: var(--text-primary);
}

.result-content {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

/* 결과 스타일 */
.result-total-top {
    background: linear-gradient(135deg, #3b82f6, #2563eb);
    color: #fff;
    padding: 20px;
    border-radius: 12px;
    text-align: center;
    margin-bottom: 10px;
    position: relative;
}

.total-label {
    display: block;
    font-size: 0.875rem;
    opacity: 0.9;
    margin-bottom: 8px;
}

.total-amount {
    display: block;
    font-size: 2rem;
    font-weight: 700;
}

.discount-applied {
    display: block;
    font-size: 1rem;
    margin-top: 10px;
    font-weight: 600;
    color: #ffeb3b;
}

.result-details {
    margin-top: 0;
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-primary);
}

.result-item:last-child {
    border-bottom: none;
}

.result-item.primary {
    font-size: 1rem;
    font-weight: 500;
    padding: 12px 0;
}

.result-subitems {
    background: #f9fafb;
    padding: 10px 20px;
    margin-bottom: 15px;
    border-left: 3px solid #e5e7eb;
}

.subitem {
    display: flex;
    justify-content: space-between;
    font-size: 0.8125rem;
    color: #666;
    padding: 4px 0;
}

.subitem span:first-child {
    font-size: 0.75rem;
}

.result-item.highlight {
    background: #e3f2fd;
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 15px;
    font-size: 1.125rem;
    font-weight: 700;
    border: none;
    position: relative;
}

.result-item.highlight .value {
    color: #1976d2;
    font-size: 1.5rem;
}

.result-comparison {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid #eee;
}

.comparison-item {
    text-align: center;
    padding: 10px;
    background: #f5f5f5;
    border-radius: 8px;
}

.comparison-item .label {
    display: block;
    font-size: 0.8125rem;
    color: #666;
    margin-bottom: 5px;
}

.comparison-item .value {
    display: block;
    font-size: 1.125rem;
    font-weight: 700;
    color: #333;
}

/* 가이드 영역 */
.guide-wrapper {
    flex: 1;
    background: var(--bg-primary);
    border-radius: 16px;
    padding: 2.5rem;
    box-shadow: var(--shadow-md);
    min-height: 400px;
    min-width: 0;
    will-change: scroll-position;
}

.guide-content > h2 {
    font-size: 1.75rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.guide-section {
    margin-bottom: 2.5rem;
}

.guide-section h3 {
    font-size: 1.125rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
    font-weight: 600;
}

.guide-section h4 {
    font-size: 1rem;
    margin: 1.5rem 0 0.75rem;
    color: var(--text-primary);
    font-weight: 600;
}

.guide-section h5 {
    font-size: 0.9375rem;
    margin: 1rem 0 0.5rem;
    color: var(--text-primary);
    font-weight: 500;
}

/* 새로운 가이드 스타일 추가 */
/* 빠른 Q&A 스타일 */
.quick-qa {
    background: var(--bg-tertiary);
    border-radius: 12px;
    padding: 1.5rem;
}

.quick-qa h4 {
    color: var(--primary-color);
    margin: 1.5rem 0 0.75rem;
    font-size: 1rem;
}

.quick-qa h4:first-child {
    margin-top: 0;
}

.quick-qa p {
    font-size: 0.9rem;
    line-height: 1.8;
    color: var(--text-secondary);
}

/* 케이스 스터디 */
.case-study {
    margin-top: 1rem;
}

.case-content {
    background: #f0f7ff;
    border-left: 4px solid var(--primary-color);
    padding: 1.25rem;
    margin-bottom: 1.5rem;
    border-radius: 0 8px 8px 0;
}

.case-content p {
    font-style: italic;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.case-list {
    list-style: none;
    padding: 0;
    margin: 1rem 0;
}

.case-list li {
    padding: 0.5rem 0;
    font-size: 0.875rem;
}

.case-result {
    background: #d4edda;
    padding: 0.75rem 1rem;
    border-radius: 6px;
    margin-top: 1rem;
    font-weight: 600;
}

/* Before/After */
.before-after {
    display: grid;
    gap: 0.75rem;
    margin: 1rem 0;
}

.before, .after {
    padding: 0.75rem;
    border-radius: 6px;
    font-size: 0.875rem;
}

.before {
    background: #f8d7da;
    color: #721c24;
}

.after {
    background: #d4edda;
    color: #155724;
}

/* 변경사항 하이라이트 */
.change-highlight {
    margin-top: 1rem;
}

.change-item {
    margin-bottom: 1.5rem;
    padding: 1rem;
    background: var(--bg-tertiary);
    border-radius: 8px;
    position: relative;
    padding-left: 4rem;
}

.change-badge {
    position: absolute;
    left: 0.75rem;
    top: 1rem;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
}

.change-badge {
    background: #17a2b8;
    color: white;
}

.change-badge.new {
    background: #28a745;
}

.change-badge.warning {
    background: #dc3545;
}

/* 마감일 박스 */
.deadline-box {
    background: #fff3cd;
    border: 1px solid #ffeaa7;
    border-radius: 8px;
    padding: 1rem;
    margin-top: 1.5rem;
}

.deadline-box h4 {
    color: #856404;
    margin-bottom: 0.5rem;
    font-size: 0.9375rem;
}

/* 인보이스 팁 */
.invoice-tips {
    background: var(--bg-tertiary);
    border-radius: 12px;
    padding: 1.5rem;
}

.must-know {
    margin-bottom: 1.5rem;
}

.common-mistake {
    background: #fff5f5;
    border: 1px solid #ffcccc;
    border-radius: 8px;
    padding: 1rem;
}

.common-mistake h4 {
    color: var(--danger-color);
    font-size: 0.9375rem;
    margin-bottom: 0.5rem;
}

/* 실수 리스트 */
.mistake-list {
    counter-reset: mistake-counter;
    list-style: none;
    padding: 0;
}

.mistake-list li {
    counter-increment: mistake-counter;
    position: relative;
    padding-left: 3rem;
    margin-bottom: 1.5rem;
}

.mistake-list li::before {
    content: counter(mistake-counter);
    position: absolute;
    left: 0;
    top: 0;
    width: 2rem;
    height: 2rem;
    background: var(--danger-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
}

.mistake-list li strong {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.mistake-list li p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* 타입 선택기 */
.type-selector {
    margin-top: 1rem;
}

.check-item {
    background: var(--bg-tertiary);
    border-radius: 8px;
    padding: 1.25rem;
    margin-bottom: 1.5rem;
}

.check-item p {
    margin: 0.5rem 0;
    font-size: 0.9rem;
}

/* 심플 테이블 */
.simple-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

.simple-table th,
.simple-table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border-primary);
}

.simple-table th {
    background: var(--bg-tertiary);
    font-weight: 600;
    font-size: 0.875rem;
}

.simple-table td {
    font-size: 0.875rem;
}

/* 기존 가이드 관련 스타일 */
.usage-scenarios {
    background: var(--bg-tertiary);
    border-radius: 12px;
    padding: 1.5rem;
}

.scenario {
    margin-bottom: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-primary);
}

.scenario:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.scenario h5 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-size: 0.9375rem;
}

.scenario p {
    font-size: 0.875rem;
    line-height: 1.8;
    color: var(--text-secondary);
}

.scenario a {
    color: var(--primary-color);
    text-decoration: none;
}

.scenario a:hover {
    text-decoration: underline;
}

.tip-section, .discount-section {
    margin-bottom: 2rem;
}

.tip-card, .discount-card {
    background: var(--bg-tertiary);
    border-radius: 12px;
    padding: 1.5rem;
    border: 1px solid var(--border-primary);
}

.tip-card h4, .discount-card h4 {
    font-size: 1rem;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.tip-card p {
    font-size: 0.875rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.tip-list {
    list-style: none;
    padding: 0;
}

.tip-list li {
    padding: 0.5rem 0 0.5rem 1.5rem;
    position: relative;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.tip-list li::before {
    content: "💡";
    position: absolute;
    left: 0;
}

.discount-table {
    width: 100%;
    margin-bottom: 1rem;
}

.discount-table td {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-primary);
}

.discount-table td:last-child {
    text-align: right;
    color: var(--primary-color);
    font-weight: 600;
}

.discount-table tr:last-child td {
    border-bottom: none;
}

/* 비교 테이블 */
.comparison-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-primary);
    overflow: hidden;
    margin: 1rem 0;
    font-size: 0.9rem;
}

.comparison-table th,
.comparison-table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border-primary);
}

.comparison-table th {
    background: var(--bg-tertiary);
    font-weight: 600;
}

/* FAQ */
.faq-section {
    margin-top: 2.5rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-primary);
}

.faq-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.faq-item {
    background: var(--bg-tertiary);
    border-radius: 8px;
    border: 1px solid var(--border-primary);
    overflow: hidden;
    transition: all var(--transition-base);
}

.faq-question {
    width: 100%;
    padding: 1rem 1.25rem;
    background: transparent;
    border: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    text-align: left;
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
    transition: background var(--transition-base);
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.faq-question:hover {
    background: var(--bg-secondary);
}

.faq-icon {
    font-size: 1.25rem;
    transition: transform var(--transition-base);
    flex-shrink: 0;
    margin-left: 1rem;
}

.faq-question.active .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    padding: 0 1.25rem;
    max-height: 0;
    overflow: hidden;
    transition: all var(--transition-slow);
    background: var(--bg-primary);
}

.faq-answer.active {
    padding: 1rem 1.25rem 1.25rem;
    max-height: 500px;
}

.faq-answer p {
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--text-secondary);
}

/* 공유 모달 */
.share-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 1rem;
}

.share-modal-content {
    background: var(--bg-primary);
    border-radius: 12px;
    padding: 0;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    animation: modalSlideIn 0.3s ease-out;
}

@keyframes modalSlideIn {
    from {
        transform: translateY(-20px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.share-modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border-primary);
}

.share-modal-header h3 {
    margin: 0;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
}

.close-modal {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    transition: all var(--transition-base);
}

.close-modal:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.share-buttons {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
    padding: 1.5rem;
}

.share-button {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 1rem;
    border: 1px solid var(--border-primary);
    border-radius: 8px;
    background: var(--bg-primary);
    font-size: 0.875rem;
    color: var(--text-primary);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
    font-family: inherit;
}

.share-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.share-button svg {
    width: 1.5rem;
    height: 1.5rem;
}

.share-button.facebook {
    border-color: #1877f2;
    color: #1877f2;
}

.share-button.facebook:hover {
    background: #1877f2;
    color: #fff;
}

.share-button.facebook svg {
    fill: #1877f2;
}

.share-button.facebook:hover svg {
    fill: white;
}

.share-button.twitter {
    border-color: #000;
    color: #000;
}

.share-button.twitter:hover {
    background: #000;
    color: #fff;
}

.share-button.twitter svg {
    fill: #000;
}

.share-button.twitter:hover svg {
    fill: white;
}

.share-button.kakao {
    border-color: #fee500;
    color: #3a1d1d;
}

.share-button.kakao:hover {
    background: #fee500;
}

.share-button.kakao svg {
    fill: #3a1d1d;
}

.share-button.naver {
    border-color: #03c75a;
    color: #03c75a;
}

.share-button.naver:hover {
    background: #03c75a;
    color: #fff;
}

.share-button.naver svg {
    fill: #03c75a;
}

.share-button.naver:hover svg {
    fill: white;
}

.share-button.copy-link {
    grid-column: 1 / -1;
    flex-direction: row;
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.share-button.copy-link:hover {
    background: var(--primary-color);
    color: #fff;
}

.share-button.copy-link svg {
    stroke: var(--primary-color);
}

.share-button.copy-link:hover svg {
    stroke: white;
}

/* 모바일 메뉴 관련 스타일 수정 */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--global-nav-text);
    font-size: 1.5rem;
    padding: 0.75rem 0.75rem 0.75rem 0.5rem;
    margin-right: 0.5rem;
    margin-left: 0;
    cursor: pointer;
    user-select: none;
    min-width: 44px;
    min-height: 44px;
    -webkit-tap-highlight-color: transparent;
    -webkit-user-select: none;
    touch-action: manipulation;
}

.mobile-menu {
    position: fixed;
    top: 0;
    left: -280px;
    width: 280px;
    height: 100vh;
    background: var(--bg-primary);
    box-shadow: 2px 0 10px rgba(0,0,0,0.1);
    transition: left 0.3s ease;
    z-index: 1100;
    overflow-y: auto;
}

.mobile-menu.active {
    left: 0;
}

.mobile-menu-btn,
.mobile-menu-close,
.mobile-menu-overlay {
    -webkit-tap-highlight-color: transparent;
}

.mobile-menu-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 1050;
}

.mobile-menu-overlay.active {
    display: block;
}

.mobile-menu-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-primary);
    background: var(--bg-primary);
}

.mobile-menu-header h3 {
    margin: 0;
    font-size: 1.125rem;
    color: var(--text-primary);
}

.mobile-menu-header button {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.mobile-menu-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.mobile-menu-list > li {
    border-bottom: 1px solid var(--border-primary);
}

.mobile-menu-list > li > a {
    display: block;
    padding: 1rem 1.5rem;
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: background var(--transition-base);
}

.mobile-menu-list > li > a:hover {
    background: var(--bg-tertiary);
}

.mobile-menu-list > li.active > a {
    color: var(--primary-color);
    background: #f0f7ff;
}

.mobile-menu-list ul {
    list-style: none;
    padding: 0;
    margin: 0;
    background: var(--bg-tertiary);
}

.mobile-menu-list ul li {
    border-top: 1px solid var(--border-primary);
}

.mobile-menu-list ul a {
    display: block;
    padding: 0.75rem 2.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    transition: all var(--transition-base);
}

.mobile-menu-list ul a:hover {
    color: var(--primary-color);
    background: var(--bg-primary);
}

/* 2025 개정사항 스타일 */
.revision-card {
    background: #fff3cd;
    border: 1px solid #ffeaa7;
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.revision-card h4 {
    color: #856404;
    margin-bottom: 1rem;
}

.revision-list {
    list-style: none;
    padding: 0;
}

.revision-list li {
    padding: 0.5rem 0 0.5rem 1.5rem;
    position: relative;
}

.revision-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #856404;
    font-weight: bold;
}

.schedule-table {
    margin: 1.5rem 0;
}

.comparison-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 1rem;
}

.comparison-card {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-primary);
    border-radius: 8px;
    padding: 1.5rem;
}

.comparison-card h5 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.125rem;
}

.comparison-card ul {
    list-style: none;
    padding: 0;
}

.comparison-card li {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-primary);
}

.comparison-card li:last-child {
    border-bottom: none;
}

.penalty-card {
    background: #f8d7da;
    border: 1px solid #f5c2c7;
    border-radius: 12px;
    padding: 1.5rem;
    margin-top: 1.5rem;
}

.penalty-card h4 {
    color: #842029;
    margin-bottom: 1rem;
}

.penalty-card h5 {
    color: #842029;
    font-size: 1rem;
    margin: 1rem 0 0.5rem;
}

.penalty-card ul {
    list-style: none;
    padding: 0;
}

.penalty-card li {
    padding: 0.25rem 0 0.25rem 1.5rem;
    position: relative;
}

.penalty-card li::before {
    content: "•";
    position: absolute;
    left: 0.5rem;
    color: #842029;
}

.exclude-list {
    list-style: none;
    padding: 0;
}

.exclude-list li {
    padding: 0.5rem 0 0.5rem 1.5rem;
    position: relative;
    color: var(--danger-color);
}

.exclude-list li::before {
    content: "✕";
    position: absolute;
    left: 0;
    color: var(--danger-color);
    font-weight: bold;
}

/* 외부 링크 스타일 */
.info-box a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    border-bottom: 1px solid transparent;
    transition: border-color var(--transition-base);
}

.info-box a:hover {
    border-bottom-color: var(--primary-color);
}

/* 부가세 계산기 전용 스타일 추가 */
/* 버튼 그리드 수정 - 공급가액 세로 2열 */
.button-grid-vat {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 1fr 1fr;
    grid-template-areas: 
        "share reset"
        "share calculate";
    gap: 8px;
    margin-top: 1.5rem;
    height: 90px;
}

.button-grid-vat .share-btn {
    grid-area: share;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 4px;
    padding: 0.5rem;
}

.button-grid-vat .reset-btn {
    grid-area: reset;
}

.button-grid-vat .calculate-btn {
    grid-area: calculate;
}

/* 견적/간이과세 탭 전용 버튼 그리드 추가 */
.button-grid-tools {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin-top: 1.5rem;
}

.button-grid-tools .share-btn,
.button-grid-tools .reset-btn {
    grid-area: unset;
}

/* 결과 하단 버튼 그리드 - 수정된 레이아웃 */
.button-grid-result {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 1fr 1fr;
    grid-template-areas: 
        "share excel"
        "share reset";
    gap: 8px;
    margin-top: 1.5rem;
    height: 90px;
}

.button-grid-result .share-btn-result {
    grid-area: share;
    background: #fff7ed;
    border-color: #fed7aa;
    color: #ea580c;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 4px;
    padding: 0.5rem;
}

.button-grid-result .share-btn-result:hover {
    background: #ffedd5;
    border-color: #fdba74;
}

.button-grid-result .excel-btn {
    grid-area: excel;
}

.button-grid-result .reset-btn {
    grid-area: reset;
}

/* 카드수수료 옵션 스타일 - 왼쪽 정렬 수정 */
.cardfee-input-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-left: 1.75rem;
    margin-top: 0.5rem;
}

#cardfee-options, #batch-cardfee-options {
    align-items: center;
    gap: 0.5rem;
    margin-left: 1.75rem;
    margin-top: 0.5rem;
}

.input-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* 일괄 계산 스타일 */
.batch-items-container {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.batch-item {
    display: grid;
    grid-template-columns: 1fr 2fr auto;
    gap: 0.5rem;
    align-items: center;
}

.batch-item .item-name {
    width: 100%;
    padding: 0.75rem;
    font-size: 1rem;
    font-weight: 500;
    border: 1px solid var(--border-primary);
    border-radius: 6px;
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: border-color var(--transition-base);
    height: 44px;
}

.remove-btn {
    width: 32px;
    height: 32px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-primary);
    border-radius: 4px;
    cursor: pointer;
    color: var(--danger-color);
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.remove-btn:hover {
    background: #fee2e2;
    border-color: var(--danger-color);
}

.add-item-btn {
    width: 100%;
    padding: 0.75rem;
    background: var(--bg-tertiary);
    border: 1px dashed var(--border-secondary);
    border-radius: 6px;
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 0.875rem;
    transition: all 0.2s;
    margin-top: 0.5rem;
}

.add-item-btn:hover {
    background: var(--bg-secondary);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

/* 도구 탭 스타일 */
.result-box {
    background: var(--bg-tertiary);
    border-radius: 8px;
    padding: 1rem;
    margin-top: 1rem;
}

.reverse-text-box {
    background: var(--bg-primary);
    border: 1px solid var(--border-primary);
    border-radius: 6px;
    padding: 1rem;
    margin-bottom: 1rem;
}

.reverse-text-box pre {
    margin: 0;
    white-space: pre-wrap;
    font-family: inherit;
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--text-primary);
}

.copy-btn {
    padding: 0.5rem 1rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.875rem;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

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

/* 엑셀 버튼 스타일 */
.excel-btn {
    background: #107c41;
    color: white;
    border-color: #107c41;
}

.excel-btn:hover {
    background: #0e5a30;
    border-color: #0e5a30;
}

/* 정보 박스 */
.info-box {
    background: #e3f2fd;
    border: 1px solid #1976d2;
    border-radius: 6px;
    padding: 1rem;
    font-size: 0.875rem;
    line-height: 1.6;
}

/* 모바일 미디어쿼리 시작 */
@media (max-width: 768px) {
    .mobile-menu-btn {
        display: block !important;
    }

    .nav-brand {
        margin-right: auto;  
    }

    .nav-menu {
        display: none;
    }

    body {
        font-size: 16px !important;
        -webkit-text-size-adjust: 100%;
    }

    .global-nav-container {
        padding: 0 1rem 0 0.5rem;
    }

    .nav-brand {
        font-size: 1.125rem;
        margin-right: 1rem;
    }

    .breadcrumb-container {
        padding: 0 1rem;
    }

    .main-title-section {
        padding: 1.5rem 0;
    }
    
    .main-title {
        font-size: 1.75rem;
        flex-direction: row;
        gap: 0.5rem;
        flex-wrap: nowrap;
    }
    
    .title-icon {
        font-size: 1.5rem;
        flex-shrink: 0;
    }
    
    .main-subtitle {
        font-size: 0.9375rem;
        padding: 0 1rem;
        line-height: 1.6;
    }

    .calculator-header.compact {
        display: flex;
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        gap: 0.5rem;
        padding: 0.75rem;
    }

    .author-info {
        order: 1;
    }
    
    .update-badge {
        order: 2;
        font-size: 0.6875rem;
        padding: 0.25rem 0.5rem;
    }
    
    .author-avatar {
        width: 24px;
        height: 24px;
    }
    
    .author-name {
        font-size: 0.8125rem;
    }

    .main-wrapper {
        flex-direction: column;
        padding: 0;
        gap: 0;
    }

    .calculator-wrapper {
        width: 100%;
        position: relative;
        top: 0;
        max-height: none;
        margin-bottom: 2rem;
    }

    .calculator-card {
        height: auto;
        border-radius: 0;
        box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    }

    .calculator-header h2 {
        font-size: 1.25rem;
    }

    .calculator-body {
        padding: 1rem;
        overflow-y: visible;
        -webkit-overflow-scrolling: touch;
    }

    .guide-wrapper {
        border-radius: 0;
        padding: 1.5rem;
        margin-top: 0;
        border-top: 8px solid var(--bg-secondary);
    }

    .table-of-contents {
        margin: 0 0 1.5rem;
    }

    .toc-list {
        grid-template-columns: 1fr;
    }

    .form-row, .form-row-group {
        margin-bottom: 1.25rem !important;
    }

    .form-row-group {
        grid-template-columns: 1fr 1fr;
        gap: 0.5rem;
    }

    label {
        font-size: 0.875rem !important;
    }

    input, select {
        font-size: 16px !important;
        height: 44px;
        min-height: 44px;
    }

    .unit-inline {
        font-size: 0.875rem;
    }

    .tab-button {
        padding: 0.625rem 0.125rem;
    }

    .tab-text-top {
        font-size: 1rem;
    }

    .tab-text-bottom {
        font-size: 0.75rem;
    }

    .calculator-tabs {
        margin-bottom: 1rem;
    }

    .accordion-button.half-width {
        min-width: 120px;
        font-size: 0.75rem;
        padding: 0.5rem 0.625rem;
    }

    .dotted-line {
        display: none;
    }

    .button-grid {
        grid-template-columns: 1fr 1fr;
        grid-template-rows: auto auto;
        grid-template-areas: 
            "share reset"
            "calculate calculate";
        gap: 0.5rem;
        margin-top: 1rem;
        height: auto;
    }

    .button-grid-bottom {
        gap: 0.5rem;
        margin-top: 1rem;
    }

    .btn {
        font-size: 0.8125rem;
        padding: 0.625rem 0.5rem;
        min-height: 40px;
    }

    .btn svg {
        width: 14px;
        height: 14px;
    }

    .total-amount {
        font-size: 1.75rem;
    }

    .discount-applied {
        font-size: 0.875rem;
    }

    .result-card {
        padding: 0.875rem;
    }

    .result-card h3 {
        font-size: 1.125rem;
    }

    .result-item {
        padding: 0.375rem 0;
        font-size: 0.875rem;
    }

    .result-item.primary {
        font-size: 0.9375rem;
        padding: 0.75rem 0;
    }

    .result-subitems {
        padding: 0.75rem 1rem;
    }

    .subitem {
        font-size: 0.75rem;
    }

    .result-item.highlight {
        padding: 0.75rem;
        font-size: 1rem;
    }

    .result-item.highlight .value {
        font-size: 1.25rem;
    }

    .guide-content > h2 {
        font-size: 1.5rem;
    }

    .guide-section {
        margin-bottom: 2rem;
    }

    .guide-section h3 {
        font-size: 1.125rem;
    }

    .guide-section h4 {
        font-size: 1rem;
        margin: 1.25rem 0 0.75rem;
    }

    .guide-section h5 {
        font-size: 0.9375rem;
    }

    .usage-scenarios,
    .tip-card,
    .discount-card {
        padding: 1rem;
    }

    .scenario {
        margin-bottom: 1.25rem;
        padding-bottom: 1.25rem;
    }

    .scenario h5 {
        font-size: 0.875rem;
    }

    .scenario p {
        font-size: 0.8125rem;
        line-height: 1.8;
    }

    .tip-section, .discount-section {
        margin-bottom: 1.5rem;
    }

    .tip-list li {
        font-size: 0.8125rem;
    }

    .discount-table {
        font-size: 0.8125rem;
    }

    .comparison-table {
        font-size: 0.75rem;
    }

    .comparison-table th,
    .comparison-table td {
        padding: 0.5rem 0.375rem;
    }

    .faq-section {
        margin-top: 2rem;
        padding-top: 1.5rem;
    }

    .faq-item {
        margin-bottom: 0.5rem;
    }

    .faq-question {
        padding: 0.875rem 1rem;
        font-size: 0.875rem;
    }

    .faq-icon {
        font-size: 1rem;
    }

    .faq-answer {
        font-size: 0.8125rem;
    }

    .faq-answer.active {
        padding: 0.75rem 1rem 1rem;
    }

    .share-modal-content {
        max-width: 350px;
    }

    .share-buttons {
        grid-template-columns: 1fr 1fr;
        gap: 0.625rem;
        padding: 1.25rem;
    }

    .share-button {
        padding: 0.75rem;
        font-size: 0.75rem;
    }

    .share-button svg {
        width: 1.25rem;
        height: 1.25rem;
    }

    .btn, .tab-button, input, select, .faq-question {
        min-height: 44px;
        min-width: 44px;
    }

    input[type="email"],
    input[type="number"],
    input[type="tel"],
    input[type="text"],
    select,
    textarea {
        font-size: 16px !important;
    }
    
    /* 모바일 체크박스/라디오버튼 크기 조정 */
    input[type="checkbox"],
    input[type="radio"] {
        width: 16px !important;
        height: 16px !important;
        min-width: 16px !important;
        min-height: 16px !important;
        max-width: 16px !important;
        max-height: 16px !important;
        -webkit-transform: scale(1) !important;
        transform: scale(1) !important;
    }
    
    /* 옵션 타이틀 레이아웃 조정 */
    .option-title {
        align-items: center;
    }
    
    .option-title label {
        font-size: 0.875rem;
        margin-bottom: 0;
    }
    
    /* 라디오 그룹 아이템 조정 */
    .radio-item {
        padding: 0.5rem;
    }
    
    .radio-item input[type="radio"] {
        margin-right: 0.5rem;
    }
    
    /* 모바일용 체크박스 appearance 속성 추가 */
    .option-group input[type="checkbox"],
    .option-title input[type="checkbox"],
    #withholding-check,
    #cardfee-check,
    #reverse-calc-check,
    #batch-withholding-check,
    #batch-cardfee-check {
        -webkit-appearance: checkbox !important;
        -moz-appearance: checkbox !important;
        appearance: checkbox !important;
    }

    .radio-group input[type="radio"],
    .radio-item input[type="radio"],
    input[name="withholding-rate"],
    input[name="batch-withholding-rate"] {
        width: 16px !important;
        height: 16px !important;
        -webkit-appearance: radio !important;
        -moz-appearance: radio !important;
        appearance: radio !important;
    }
    
    .radio-item,
    .checkbox-item {
        padding: 0.5rem 0.625rem;
    }
    
    .radio-item span,
    .checkbox-item span {
        font-size: 0.8125rem;
    }
    
    .revision-card,
    .penalty-card {
        padding: 1rem;
    }
    
    .comparison-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .comparison-card {
        padding: 1rem;
    }
    
    .revision-list li,
    .penalty-card li,
    .exclude-list li {
        font-size: 0.875rem;
    }
  
    /* 양방향 계산 안내 - 모바일에서도 한 줄로 */
    .auto-calc-notice {
        font-size: 0.7rem;
        padding: 0.5rem 0.75rem;
        white-space: normal;
        flex-wrap: wrap;
        text-align: center;
        line-height: 1.4;
    }
    
    /* 부가세 계산기 모바일 추가 */
    .button-grid-vat {
        grid-template-columns: 1fr 1fr;
        grid-template-rows: auto auto;
        height: auto;
    }
    
    .button-grid-vat .share-btn {
        flex-direction: row;
        gap: 8px;
    }
    
    .button-grid-tools {
        gap: 0.5rem;
        margin-top: 1rem;
    }
    
    .button-grid-result {
        grid-template-columns: 1fr 1fr;
        grid-template-rows: auto auto;
        height: auto;
    }
    
    .button-grid-result .share-btn-result {
        flex-direction: row;
        gap: 8px;
    }
    
    .batch-item {
        grid-template-columns: 1fr;
        gap: 0.5rem;
        position: relative;
        padding-right: 2.5rem;
    }
    
    .batch-item .remove-btn {
        position: absolute;
        right: 0.5rem;
        top: 0.5rem;
    }
    
    .auto-calc-notice {
        font-size: 0.75rem;
        padding: 0.625rem 0.875rem;
    }
    
    .rate-input {
        width: 50px;
        font-size: 0.8125rem;
    }
    
    .option-title {
        flex-wrap: wrap;
    }

    /* 옵션 그룹 텍스트 크기 조정 */
    .option-title label {
        font-size: 0.8125rem !important;
    }

    .accordion-content {
        padding: 0.75rem !important;
    }
    
    /* 새로운 가이드 스타일 - 모바일 */
    .quick-qa {
        padding: 1rem;
    }
    
    .quick-qa h4 {
        font-size: 0.9375rem;
    }
    
    .case-content {
        padding: 1rem;
    }
    
    .change-item {
        padding-left: 1rem;
        padding-top: 2.5rem;
    }
    
    .change-badge {
        top: 0.5rem;
        left: 0.5rem;
    }
    
    .mistake-list li {
        padding-left: 2.5rem;
    }
    
    .mistake-list li::before {
        width: 1.75rem;
        height: 1.75rem;
        font-size: 0.875rem;
    }
}
/* 모바일 미디어쿼리 끝 */

/* 태블릿 대응 */
@media (min-width: 769px) and (max-width: 1024px) {
    .main-wrapper {
        flex-direction: column;
        max-width: 768px;
    }

    .main-title {
        font-size: 1.875rem;
    }
    
    .main-subtitle {
        font-size: 1rem;
    }

    .calculator-wrapper {
        width: 100%;
        position: relative;
        top: 0;
        max-height: none;
        margin-bottom: 2rem;
    }

    .calculator-card {
        height: auto;
    }

    .guide-wrapper {
        width: 100%;
    }
}

/* 접근성 개선 */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0s !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0s !important;
    }
}

@media (prefers-contrast: high) {
    .btn {
        border-width: 2px;
    }
    
    input:focus, select:focus {
        outline: 3px solid var(--primary-color);
        outline-offset: 2px;
    }
}

/* 인쇄 스타일 */
@media print {
    .global-nav,
    .breadcrumb,
    .main-title-section,
    .table-of-contents,
    .btn,
    .button-grid,
    .button-grid-bottom,
    .divider-content,
    .faq-section {
        display: none !important;
    }
    
    .calculator-card,
    .guide-wrapper {
        box-shadow: none !important;
        page-break-inside: avoid;
    }
    
    .result-container {
        page-break-inside: avoid;
    }
}