/* ===================================
   CSS Reset & Base Styles
   =================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 라이트 모드 색상 팔레트 */
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-secondary: #64748b;
    --color-background: #ffffff;
    --color-surface: #f8fafc;
    --color-surface-hover: #f1f5f9;
    --color-border: #e2e8f0;
    --color-border-light: #f1f5f9;
    --color-text: #1e293b;
    --color-text-secondary: #64748b;
    --color-text-light: #94a3b8;
    --color-accent: rgba(37, 99, 235, 0.1);
    --color-success: #059669;
    --color-warning: #d97706;
    --color-error: #dc2626;
    --color-info: #0284c7;
    
    /* 타이포그래피 - 한글 최적화 (Context7 기반) */
    --font-family: 'Noto Sans KR', 'Malgun Gothic', '맑은 고딕', 'Apple SD Gothic Neo', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
    --font-size-base: 14px;
    --font-size-small: 12px;
    --font-size-xs: 10px;
    --font-size-h1: 28px;
    --font-size-h2: 22px;
    --font-size-h3: 18px;
    --font-size-h4: 16px;
    
    /* 테두리 반경 */
    --border-radius: 8px;
    
    /* 간격 */
    --spacing-xs: 6px;
    --spacing-sm: 10px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* 브레이크포인트 */
    --breakpoint-mobile: 768px;
    --breakpoint-tablet: 1024px;
    
    /* 애니메이션 */
    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-medium: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* 그라디언트 */
    --gradient-primary: linear-gradient(135deg, #2563eb 0%, #3b82f6 100%);
    --gradient-surface: linear-gradient(145deg, #f8fafc 0%, #ffffff 100%);
}

html {
    font-size: var(--font-size-base);
}

body {
    font-family: var(--font-family);
    color: var(--color-text);
    background: var(--color-background);
    background-image: 
        radial-gradient(circle at 20% 80%, rgba(37, 99, 235, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(37, 99, 235, 0.03) 0%, transparent 50%);
    line-height: 1.7; /* 한글 가독성 향상 */
    min-height: 100vh;
    font-weight: 400; /* 한글 최적화 */
    letter-spacing: -0.01em; /* 한글 자간 조정 */
    word-spacing: 0.05em; /* 한글 어간 조정 */
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===================================
   Typography
   =================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 500; /* 한글 제목 최적화 */
    line-height: 1.4; /* 한글 제목 가독성 향상 */
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em; /* 한글 제목 자간 조정 */
}

h1 { font-size: var(--font-size-h1); }
h2 { font-size: var(--font-size-h2); }
h3 { font-size: var(--font-size-h3); }
h4 { font-size: var(--font-size-h4); }

p {
    margin-bottom: var(--spacing-sm);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: opacity var(--transition-fast);
}

a:hover {
    opacity: 0.7;
}

/* ===================================
   Layout
   =================================== */
.layout-container {
    display: flex;
    max-width: 1400px;
    margin: 0 auto;
    gap: var(--spacing-lg);
    padding: 0 var(--spacing-md);
}

.content-main {
    flex: 1;
    min-width: 0; /* flexbox에서 overflow 방지 */
}

.ad-space {
    width: 200px;
    min-height: 600px;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    padding: var(--spacing-md);
}

.ad-placeholder {
    width: 100%;
    height: 250px;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border: 2px dashed var(--color-border);
    border-radius: var(--border-radius);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: var(--color-text-secondary);
    font-size: var(--font-size-small);
    text-align: center;
    transition: all var(--transition-fast);
}

.ad-placeholder:hover {
    background: linear-gradient(135deg, #e9ecef 0%, #dee2e6 100%);
    border-color: var(--color-primary);
}

.ad-placeholder p {
    margin: 0 0 var(--spacing-xs) 0;
    font-weight: 600;
}

.ad-placeholder small {
    font-size: 0.75rem;
    opacity: 0.7;
}

.container {
    max-width: 100%;
    margin: 0 auto;
    padding: 0 8px;
}

.main-content {
    flex: 1;
    padding: var(--spacing-md) 0;
}

/* ===================================
   Header
   =================================== */
.header {
    background: var(--gradient-surface);
    border-bottom: 1px solid var(--color-border);
    color: var(--color-text);
    padding: var(--spacing-md) 0;
    text-align: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--gradient-primary);
}

.logo {
    font-size: var(--font-size-h1);
    margin-bottom: var(--spacing-xs);
    cursor: pointer;
    transition: all var(--transition-fast);
    user-select: none;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.logo:hover {
    transform: scale(1.02);
    filter: brightness(1.1);
}

.logo.clickable:hover {
    transform: scale(1.05);
}

.logo.clickable:active {
    transform: scale(0.95);
}

.tagline {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    font-weight: 400;
    opacity: 0.8;
}

/* 햄버거 버튼 (모바일 전용) */
.hamburger-btn {
    position: absolute;
    left: 8px;
    top: 50%;
    transform: translateY(-50%);
    width: 36px;
    height: 36px;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    background: var(--color-surface);
    display: none;
    align-items: center;
    justify-content: center;
    gap: 5px; /* 선 사이 간격을 넓혀 햄버거 형태 강조 */
    -webkit-appearance: none;
    -webkit-tap-highlight-color: rgba(0,0,0,0);
    z-index: 1002;
    box-shadow: 0 2px 6px rgba(0,0,0,0.06);
}

/* SVG 햄버거 아이콘 - 선은 라운드 캡으로 처리 */
.hamburger-icon {
    display: block;
}

.hamburger-icon path {
    stroke: var(--color-text);
    stroke-width: 2.5;
    stroke-linecap: round;
}

@media (max-width: 768px) {
    .hamburger-btn { display: inline-flex !important; }
}

/* ===================================
   Footer
   =================================== */
.footer {
    background-color: var(--color-surface);
    color: var(--color-text-secondary);
    padding: var(--spacing-md) 0;
    text-align: center;
    margin-top: auto;
    border-top: 1px solid var(--color-border);
}

.footer p {
    margin-bottom: var(--spacing-xs);
    font-size: var(--font-size-small);
}

.footer-contact {
    color: var(--color-text-secondary);
    font-weight: 500;
}

.contact-email {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 600;
    transition: color var(--transition-fast);
}

.contact-email:hover {
    color: var(--color-secondary);
    text-decoration: underline;
}

.contact-email:active {
    color: var(--color-primary);
}

.footer-note {
    color: var(--color-text-secondary);
    font-style: italic;
}

.footer-update {
    color: var(--color-text-secondary);
}

.footer-source {
    color: var(--color-text-secondary);
    font-style: italic;
    font-size: 11px;
}

/* ===================================
   후원 섹션
   =================================== */
.donation-section {
    margin: var(--spacing-md) 0;
    padding: var(--spacing-md) 0;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.donation-text {
    font-size: var(--font-size-small);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
}

.donation-buttons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.donation-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    background-color: var(--color-surface);
    color: var(--color-text);
    text-decoration: none;
    font-size: var(--font-size-small);
    font-weight: 500;
    transition: all var(--transition-fast);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    cursor: pointer;
    font-family: inherit;
}

.donation-btn:hover {
    background-color: var(--color-primary);
    color: var(--color-background);
    border-color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.donation-btn:active {
    transform: translateY(0);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.donation-icon {
    font-size: 18px;
    line-height: 1;
}

.donation-label {
    line-height: 1;
}

/* 카카오페이 버튼 특별 스타일 */
.donation-kakaopay {
    background: linear-gradient(135deg, #FEE500 0%, #FDD835 100%);
    border-color: #FEE500;
    color: #3C1E1E;
}

.donation-kakaopay:hover {
    background: linear-gradient(135deg, #FDD835 0%, #FBC02D 100%);
    border-color: #FBC02D;
    color: #3C1E1E;
}

/* 토스 버튼 특별 스타일 */
.donation-toss {
    background: linear-gradient(135deg, #0064FF 0%, #0052D4 100%);
    border-color: #0064FF;
    color: #FFFFFF;
}

.donation-toss:hover {
    background: linear-gradient(135deg, #0052D4 0%, #003D99 100%);
    border-color: #0052D4;
    color: #FFFFFF;
}

/* 모바일 반응형 */
@media (max-width: 768px) {
    .donation-section {
        margin: var(--spacing-sm) 0;
        padding: var(--spacing-sm) 0;
    }
    
    .donation-text {
        font-size: 13px;
        margin-bottom: var(--spacing-xs);
    }
    
    .donation-btn {
        padding: 8px 16px;
        font-size: 13px;
        gap: 6px;
    }
    
    .donation-icon {
        font-size: 16px;
    }
    
    .donation-buttons {
        gap: var(--spacing-xs);
    }
}

.footer a {
    font-weight: 600;
}

/* ===================================
   Screen Management (SPA)
   =================================== */
.screen {
    display: none;
    opacity: 0;
    transition: opacity var(--transition-medium);
    min-height: 500px; /* 최소 높이 보장 */
}

.screen.active {
    display: block;
    opacity: 1;
}

/* 계산기 화면 스타일 */
.calculator-screen {
    padding: var(--spacing-lg) 0;
}

.screen-title {
    text-align: center;
    margin-bottom: var(--spacing-md);
    color: var(--color-primary);
}

/* 홈 화면 제목 특별 스타일 */
#home-screen .screen-title {
    font-size: 32px;
    font-weight: 800;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, var(--color-primary) 0%, #3b82f6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-xl);
    text-shadow: 0 2px 4px rgba(37, 99, 235, 0.1);
}

/* ===================================
   Calculator Grid (홈 화면)
   =================================== */
.calculator-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.calculator-card {
    position: relative;
    background: var(--gradient-surface);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 12px;
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    backdrop-filter: blur(10px);
    overflow: hidden;
}

.calculator-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.calculator-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(37, 99, 235, 0.2);
    border-color: var(--color-primary);
}

.calculator-card:hover::before {
    opacity: 1;
}

.card-icon {
    font-size: 36px;
    text-align: center;
    margin-bottom: 8px;
    opacity: 0.9;
    transition: all var(--transition-fast);
    filter: drop-shadow(0 0 10px rgba(37, 99, 235, 0.3));
}

.calculator-card:hover .card-icon {
    transform: scale(1.1);
    filter: drop-shadow(0 0 20px rgba(37, 99, 235, 0.5));
}

.card-title {
    font-size: 14px;
    margin-bottom: 6px;
    color: var(--color-text);
    font-weight: 600;
    letter-spacing: -0.2px;
    line-height: 1.3;
}

.card-description {
    color: var(--color-text-secondary);
    font-size: 11px;
    margin-bottom: 0;
    line-height: 1.5;
}

/* ===================================
   Dropdown Menu (대출 계산기)
   =================================== */
.calculator-card.has-dropdown {
    overflow: visible;
}

.dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-background);
    border: 2px solid var(--color-primary);
    border-top: none;
    border-radius: 0 0 12px 12px;
    margin-top: -10px;
    padding-top: 10px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
    z-index: 10;
    opacity: 0;
    transform: translateY(-10px);
    transition: opacity 0.25s ease-out, transform 0.25s ease-out;
}

.dropdown-menu.show {
    display: block;
    opacity: 1;
    transform: translateY(0);
}

.dropdown-item {
    width: 100%;
    padding: var(--spacing-md);
    background-color: transparent;
    border: none;
    text-align: center;
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-text);
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.dropdown-item:first-child {
    border-top: 1px solid var(--color-border);
}

.dropdown-item:not(:last-child) {
    border-bottom: 1px solid var(--color-border);
}

.dropdown-item:last-child {
    border-radius: 0 0 10px 10px;
}

/* ===================================
   Back Button
   =================================== */
.back-button {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: 8px;
    font-size: var(--font-size-base);
    cursor: pointer;
    transition: all var(--transition-fast);
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
    font-weight: 500;
}

.back-button:hover {
    background: var(--color-primary);
    color: #000;
    border-color: var(--color-primary);
    transform: translateX(-2px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

/* ===================================
   Calculator Content
   =================================== */
.calculator-content {
    max-width: 100%;
    margin: 0 auto;
    padding: 0;
}

/* ===================================
   Form Elements
   =================================== */

/* 라디오 버튼 그룹 */
.radio-group {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xs);
}

.radio-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    cursor: pointer;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    transition: all var(--transition-fast);
    user-select: none;
}

.radio-label:hover {
    background: var(--color-surface-hover);
    border-color: var(--color-primary);
}

.radio-label input[type="radio"] {
    margin: 0;
    accent-color: var(--color-primary);
}

.radio-label input[type="radio"]:checked + .radio-text {
    color: var(--color-primary);
    font-weight: 600;
}

.radio-text {
    font-size: var(--font-size-small);
    transition: color var(--transition-fast);
}
.input-section {
    background-color: var(--color-surface);
    padding: var(--spacing-sm);
    border-radius: 8px;
    margin-bottom: var(--spacing-sm);
}

.form-group {
    margin-bottom: var(--spacing-sm);
}

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

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--color-text);
    font-size: 15px;
    line-height: 1.4;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 10px 12px;
    font-size: 15px;
    font-weight: 400; /* 한글 입력 필드 최적화 */
    border: 2px solid var(--color-border);
    border-radius: 8px;
    background-color: var(--color-background);
    color: var(--color-text);
    transition: border-color var(--transition-fast);
    line-height: 1.6; /* 한글 입력 가독성 향상 */
    letter-spacing: -0.01em; /* 한글 입력 자간 조정 */
}

.form-group input:focus,
.form-group select:focus,
.unit-select:focus {
    outline: none;
    border-color: var(--color-primary);
}

.form-group input::placeholder {
    color: var(--color-text-secondary);
}

/* ===================================
   Input with Unit
   =================================== */
.input-with-unit {
    display: flex;
    gap: 6px;
    align-items: center;
}

.input-with-unit input {
    flex: 1;
    min-width: 180px;
    padding: 12px 16px;
    font-size: 16px;
}

.unit-select {
    width: 35px;
    flex-shrink: 0;
    font-size: 12px;
    padding: 12px 4px;
    text-align: center;
    font-weight: 600;
    background-color: var(--color-background);
    border: 2px solid var(--color-border);
    border-radius: 8px;
    color: var(--color-text);
    transition: border-color var(--transition-fast);
}

/* ===================================
   Buttons
   =================================== */
.button-group {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.btn {
    flex: 1;
    padding: 10px var(--spacing-md);
    font-size: var(--font-size-base);
    font-weight: 500; /* 한글 버튼 최적화 */
    border: 1px solid;
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
    letter-spacing: -0.01em; /* 한글 버튼 자간 조정 */
}

.btn-primary {
    background: var(--gradient-primary);
    color: #000;
    border-color: var(--color-primary);
    font-weight: 700;
    letter-spacing: 0.3px;
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
    filter: brightness(1.1);
}

.btn-secondary {
    background: var(--color-surface);
    color: var(--color-text);
    border-color: var(--color-border);
    font-weight: 600;
}

.btn-secondary:hover {
    background: var(--color-surface-hover);
    border-color: var(--color-primary);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
}

/* ===================================
   Tab Navigation
   =================================== */
.tab-navigation {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--color-border);
}

.tab-btn {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-lg);
    background-color: transparent;
    border: none;
    border-bottom: 3px solid transparent;
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    margin-bottom: -2px;
}

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

.tab-btn.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* ===================================
   Tab Navigation
   =================================== */
.tab-navigation {
    display: flex;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-sm);
    background: var(--color-surface);
    border-radius: 8px;
    padding: var(--spacing-xs);
    border: 1px solid var(--color-border);
}

.tab-btn {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    border: none;
    border-radius: 8px;
    color: var(--color-text-secondary);
    font-size: var(--font-size-small);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: center;
}

.tab-btn:hover {
    background: var(--color-surface-hover);
    color: var(--color-text);
}

.tab-btn.active {
    background: var(--gradient-primary);
    color: #000;
    font-weight: 700;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* ===================================
   Result Section
   =================================== */
.result-section {
    background-color: var(--color-surface);
    padding: var(--spacing-sm);
    border-radius: 8px;
    margin-bottom: var(--spacing-sm);
}

.result-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
    align-items: start;
}

.result-main {
    display: flex;
    flex-direction: column;
    min-width: 0; /* flex item이 축소될 수 있도록 */
}

.result-explanation {
    display: flex;
    flex-direction: column;
    background-color: var(--color-surface);
    padding: var(--spacing-sm);
    border-radius: 8px;
    border: 1px solid var(--color-border);
    max-width: 100%;
    overflow-wrap: break-word;
}

/* 반응형 디자인 */
@media (max-width: 1200px) {
    .layout-container {
        max-width: 100%;
        padding: 0 var(--spacing-sm);
    }
    
    .ad-space {
        width: 150px;
    }
    
    .ad-placeholder {
        height: 200px;
    }
}



/* 모바일에서 광고 공간 숨김 + 사이드바 오프캔버스 (최상위 우선순위) */
@media (max-width: 768px) {
    .ad-space,
    .sidebar-ad {
        display: none !important;
    }

    .sidebar-left {
        position: fixed;
        top: 0;
        left: 0;
        bottom: 0;
        width: 80%;
        max-width: 320px;
        background: var(--color-background);
        z-index: 1001;
        transform: translateX(-100%);
        transition: transform var(--transition-medium);
        padding: var(--spacing-md);
        overflow-y: auto;
        border-right: 1px solid var(--color-border);
        box-shadow: 4px 0 16px rgba(0,0,0,0.08);
    }

    .drawer-open .sidebar-left {
        transform: translateX(0);
    }

    .drawer-backdrop {
        position: fixed;
        inset: 0;
        background: rgba(0,0,0,0.25);
        backdrop-filter: blur(2px);
        z-index: 1000;
        opacity: 0;
        pointer-events: none;
        transition: opacity var(--transition-medium);
    }

    .drawer-open .drawer-backdrop {
        opacity: 1;
        pointer-events: auto;
    }

    .layout-container {
        flex-direction: column;
        gap: 0;
        padding: 0;
        max-width: 100%;
    }
    
    .content-main {
        width: 100%;
        padding: 0;
        flex: 1;
    }
}

.result-title {
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary);
    font-size: var(--font-size-h4);
}

.result-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-sm);
}

.result-item {
    background-color: var(--color-background);
    padding: var(--spacing-xs);
    border-radius: 6px;
    border: 1px solid var(--color-border);
    text-align: center;
}

.result-item.highlight {
    border: 2px solid var(--color-primary);
    background-color: var(--color-primary);
    color: var(--color-background);
}

.result-label {
    display: block;
    font-size: var(--font-size-xs);
    margin-bottom: 2px;
    opacity: 0.8;
}

.result-value {
    display: block;
    font-size: var(--font-size-base);
    font-weight: 700;
    line-height: 1.2;
}

.result-details {
    margin-top: var(--spacing-lg);
}

.result-details h4 {
    margin-bottom: var(--spacing-sm);
}

/* ===================================
   Table
   =================================== */
.result-table {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--color-background);
    border-radius: 8px;
    overflow: hidden;
}

.result-table thead {
    background-color: var(--color-primary);
    color: var(--color-background);
}

.result-table th,
.result-table td {
    padding: var(--spacing-xs);
    text-align: center;
    border-bottom: 1px solid var(--color-border);
    font-size: var(--font-size-small);
}

.result-table th {
    font-weight: 600;
}

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

.result-table tbody tr:hover {
    background-color: var(--color-surface);
}

/* ===================================
   Lotto Tickets
   =================================== */
.lotto-tickets {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
}

.lotto-ticket {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: var(--spacing-sm);
}

.lotto-ticket-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
    color: var(--color-text);
}

.lotto-balls {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 8px;
}

.lotto-ball {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--color-background);
    border: 2px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: var(--color-text);
}

.lotto-ball.marked {
    border-color: var(--color-primary);
    background: var(--color-accent);
}

@media (max-width: 768px) {
    .lotto-tickets { grid-template-columns: 1fr; }
}

/* ===================================
   Explanation (아코디언)
   =================================== */
.explanation-section {
    margin-top: 0;
}

.explanation-section.inline {
    margin-top: var(--spacing-md);
}

.explanation-toggle {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    font-size: var(--font-size-small);
    font-weight: 600;
    color: var(--color-primary);
    cursor: pointer;
    text-align: left;
    transition: all var(--transition-fast);
    margin-bottom: var(--spacing-sm);
}

.explanation-toggle:hover {
    background-color: var(--color-surface);
}

.explanation-toggle.active {
    border-bottom-left-radius: 0;
    border-bottom-right-radius: 0;
}

.explanation-content {
    max-height: 0;
    overflow: hidden;
    background-color: var(--color-background);
    border: 1px solid var(--color-border);
    border-top: none;
    border-radius: 0 0 8px 8px;
    transition: max-height var(--transition-medium);
    font-size: var(--font-size-small);
    line-height: 1.5;
    padding: 0 var(--spacing-md);
}

.explanation-content.show {
    max-height: 1000px;
    padding: var(--spacing-md);
}

.explanation-content:not(.show) {
    padding: 0 var(--spacing-md);
}

.explanation-step {
    padding: var(--spacing-xs) 0;
    border-bottom: 1px solid var(--color-border);
    font-size: var(--font-size-small);
    line-height: 1.4;
}

.explanation-step:last-child {
    border-bottom: none;
}

.explanation-step strong {
    color: var(--color-primary);
}

/* ===================================
   Chart Section
   =================================== */
.chart-section {
    background-color: var(--color-surface);
    padding: var(--spacing-sm);
    border-radius: 8px;
    margin-top: var(--spacing-sm);
}

.chart-section h3 {
    margin-bottom: var(--spacing-md);
}

.chart-section canvas {
    max-width: 100%;
    height: auto;
    cursor: default;
}

/* Chart Tooltip (dynamically created) */
#chart-tooltip {
    font-family: var(--font-family);
    line-height: 1.5;
}

/* ===================================
   Error Notification
   =================================== */
.error-notification {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 10000;
    max-width: 400px;
    background: linear-gradient(135deg, #ff6b6b, #ff5252);
    color: white;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(255, 107, 107, 0.3);
    animation: slideInRight 0.3s ease-out;
}

.error-content {
    padding: 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    position: relative;
}

.error-icon {
    font-size: 20px;
    flex-shrink: 0;
}

.error-message {
    flex: 1;
    font-weight: 500;
    line-height: 1.4;
}

.error-details {
    font-size: 12px;
    opacity: 0.9;
    margin-top: 4px;
    display: block;
}

.error-close {
    background: none;
    border: none;
    color: white;
    font-size: 18px;
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    transition: background-color 0.2s;
    flex-shrink: 0;
}

.error-close:hover {
    background-color: rgba(255, 255, 255, 0.2);
}

@keyframes slideInRight {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* ===================================
   Table Scroll (모바일)
   =================================== */
.table-wrapper {
    overflow-x: auto;
    /* overflow-y: auto; */
    /* max-height: 300px; */
    -webkit-overflow-scrolling: touch;
    border: 1px solid var(--color-border);
    border-radius: 6px;
}

.result-table {
    min-width: 100%;
    font-size: var(--font-size-small);
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 768px) {
    :root {
        --font-size-h1: 24px;
        --font-size-h2: 20px;
        --font-size-h3: 16px;
        --font-size-h4: 14px;
        --font-size-base: 14px;
        --font-size-small: 12px;
        --spacing-lg: 20px;
        --spacing-xl: 24px;
    }
    
    /* 광고 숨김 (오프캔버스 규칙은 상단 블록에 정의) */
    .ad-space,
    .sidebar-ad {
        display: none !important;
    }
    
    /* 가로 스크롤 방지 */
    html, body {
        overflow-x: hidden;
        width: 100%;
        max-width: 100vw;
        position: relative;
    }
    
    body {
        padding: 0;
        margin: 0;
    }
    
    .layout-container {
        flex-direction: column;
        gap: 0;
        padding: 0;
        max-width: 100%;
    }
    
    .layout-container,
    .content-main,
    .container,
    .calculator-content,
    .screen {
        max-width: 100%;
        overflow-x: hidden;
    }
    
    .content-main {
        width: 100%;
        padding: 0;
        flex: 1;
    }
    
    img, video, canvas, iframe {
        max-width: 100%;
        height: auto;
    }
    
    .container {
        padding: 0 var(--spacing-md);
    }
    
    /* 헤더 최적화 */
    .header {
        padding: var(--spacing-sm) 0;
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    }
    
    .logo {
        font-size: 20px;
        margin-bottom: 4px;
    }
    
    .tagline {
        font-size: 12px;
    }
    
    /* 메인 컨텐츠 */
    .main-content {
        padding: var(--spacing-sm) 0;
    }
    
    .calculator-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
        padding: 0;
    }
    
    .calculator-card {
        padding: var(--spacing-md);
        margin: 0;
    }
    
    .card-icon {
        font-size: 36px;
        margin-bottom: var(--spacing-xs);
    }
    
    .card-title {
        font-size: var(--font-size-h3);
    }
    
    .card-description {
        font-size: 12px;
    }
    
    /* 폼 요소 최적화 */
    .button-group {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .btn {
        min-height: 44px; /* 터치 타겟 최소 크기 */
        padding: 12px var(--spacing-md);
        font-size: var(--font-size-base);
    }
    
    .back-button {
        min-height: 44px;
        padding: 10px var(--spacing-md);
    }
    
    .form-group input,
    .form-group select {
        min-height: 44px;
        font-size: 16px; /* iOS 줌 방지 */
        padding: 12px;
    }
    
    /* 결과 섹션 */
    .result-container {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .result-summary {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .result-section {
        padding: var(--spacing-md);
    }
    
    .input-section {
        padding: var(--spacing-md);
    }
    
    /* 탭 네비게이션 */
    .tab-navigation {
        flex-wrap: wrap;
        gap: var(--spacing-xs);
        padding: var(--spacing-xs);
    }
    
    .tab-btn {
        min-height: 44px;
        padding: var(--spacing-sm);
        font-size: var(--font-size-small);
    }
    
    /* 테이블 최적화 */
    .result-table {
        font-size: var(--font-size-small);
    }
    
    .result-table th,
    .result-table td {
        padding: 8px 4px;
        font-size: 12px;
    }
    
    .table-wrapper {
        margin: 0 calc(-1 * var(--spacing-md));
        border-left: none;
        border-right: none;
        border-radius: 0;
    }
    
    /* 차트 최적화 */
    .chart-section {
        padding: var(--spacing-sm);
        margin: 0 calc(-1 * var(--spacing-md));
    }
    
    .chart-section canvas {
        height: 250px !important;
        width: 100% !important;
    }
    
    /* 스크린 타이틀 */
    .screen-title {
        font-size: var(--font-size-h2);
        margin-bottom: var(--spacing-md);
    }
    
    /* 설명 토글 */
    .explanation-toggle {
        min-height: 44px;
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    /* 드롭다운 메뉴 */
    .dropdown-menu {
        position: fixed;
        left: var(--spacing-md);
        right: var(--spacing-md);
        width: auto;
        margin-top: var(--spacing-sm);
    }
    
    /* 푸터 최적화 */
    .footer {
        padding: var(--spacing-md) var(--spacing-sm);
        font-size: 11px;
    }
    
    .footer p {
        margin-bottom: var(--spacing-xs);
        font-size: 11px;
        line-height: 1.4;
    }
}

@media (min-width: 769px) and (max-width: 1023px) {
    .calculator-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .calculator-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* ===================================
   Error Messages
   =================================== */
.error-message {
    background-color: #FFF5F5;
    border: 1px solid #FF0000;
    color: #CC0000;
    padding: var(--spacing-sm);
    border-radius: 8px;
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-small);
}

/* ===================================
   Loading State
   =================================== */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

/* ===================================
   Utility Classes
   =================================== */
.text-center {
    text-align: center;
}

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

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

@keyframes slideDown {
    from {
        max-height: 0;
    }
    to {
        max-height: 1000px;
    }
}

/* ===================================
   Enhanced Tab Menu Styles (상환방식 개선)
   Cache Buster: 2024-12-19 15:30
   =================================== */
.tab-menu {
    display: flex;
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    border-radius: 12px;
    padding: 6px;
    margin-top: var(--spacing-md);
    border: 2px solid var(--color-border-light);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
    position: relative;
    overflow: hidden;
}

.tab-menu::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--color-primary), #3b82f6, #1d4ed8);
    opacity: 0.1;
}

.tab-button {
    flex: 1;
    padding: var(--spacing-md) var(--spacing-sm);
    border: none;
    background: transparent;
    color: var(--color-text-secondary);
    font-size: var(--font-size-small);
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    min-height: 60px;
    justify-content: center;
}

.tab-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--color-primary), #3b82f6);
    opacity: 0;
    border-radius: 8px;
    transition: opacity 0.3s ease;
    z-index: -1;
}

.tab-button:hover {
    color: var(--color-primary);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.15);
}

.tab-button:hover::before {
    opacity: 0.05;
}

.tab-button.active {
    background: linear-gradient(135deg, var(--color-primary), #3b82f6);
    color: white;
    box-shadow: 0 4px 16px rgba(37, 99, 235, 0.3);
    transform: translateY(-2px);
}

.tab-button.active::before {
    opacity: 0;
}

.tab-button.active:hover {
    background: linear-gradient(135deg, var(--color-primary-dark), #1d4ed8);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
}

/* 상환방식별 아이콘 스타일 */
.tab-button .repayment-icon {
    font-size: 18px;
    margin-bottom: 2px;
    opacity: 0.8;
    transition: all 0.3s ease;
}

.tab-button.active .repayment-icon {
    opacity: 1;
    transform: scale(1.1);
}

.tab-button .repayment-label {
    font-size: 12px;
    font-weight: 500;
    line-height: 1.2;
}

/* 상환방식 설명 스타일 */
.repayment-description {
    margin-top: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    border-radius: 8px;
    border-left: 3px solid var(--color-primary);
    transition: all 0.3s ease;
}

.repayment-description small {
    color: var(--color-text-secondary);
    font-size: 12px;
    line-height: 1.4;
    display: block;
}

.repayment-description:hover {
    background: linear-gradient(135deg, #e0f2fe 0%, #bae6fd 100%);
    transform: translateX(2px);
}

/* 반응형 탭 메뉴 */
@media (max-width: 768px) {
    .tab-menu {
        flex-direction: column;
        gap: var(--spacing-xs);
        padding: var(--spacing-sm);
    }
    
    .tab-button {
        padding: var(--spacing-md);
        font-size: var(--font-size-small);
        min-height: 44px;
        flex-direction: row;
        justify-content: flex-start;
        gap: var(--spacing-sm);
    }
    
    .tab-button .repayment-icon {
        font-size: 18px;
        margin-bottom: 0;
    }
    
    .tab-button .repayment-label {
        font-size: var(--font-size-small);
    }
}

@media (max-width: 480px) {
    :root {
        --font-size-h1: 22px;
        --font-size-h2: 18px;
        --font-size-h3: 15px;
    }
    
    .logo {
        font-size: 18px;
    }
    
    .tagline {
        font-size: 11px;
    }
    
    .tab-button {
        font-size: 12px;
        padding: var(--spacing-sm);
        min-height: 44px;
    }
    
    .tab-button .repayment-icon {
        font-size: 16px;
    }
    
    .tab-button .repayment-label {
        font-size: 11px;
    }
    
    .calculator-card {
        padding: var(--spacing-sm);
    }
    
    .card-icon {
        font-size: 32px;
    }
    
    .container {
        padding: 0 var(--spacing-sm);
    }
}

.fade-in {
    animation: fadeIn var(--transition-medium);
}

/* ===================================
   News Section Styles
   =================================== */
.news-section {
    margin-top: var(--spacing-xl);
    padding: var(--spacing-lg);
    max-width: 1400px;
    margin-left: auto;
    margin-right: auto;
}

.section-title {
    font-size: var(--font-size-h2);
    margin-bottom: var(--spacing-lg);
    text-align: center;
    color: var(--color-text);
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(5, minmax(220px, 1fr));
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

@media (max-width: 1400px) {
    .news-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

@media (max-width: 1024px) {
    .news-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .news-section {
        padding: var(--spacing-md);
        margin-top: var(--spacing-md);
    }
    
    .news-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
        margin-top: var(--spacing-sm);
    }
    
    .news-card {
        padding: var(--spacing-md);
        border-radius: 12px;
    }
    
    .news-card-image {
        aspect-ratio: 16 / 9; /* 모바일에서 더 넓은 비율 */
        margin-bottom: var(--spacing-sm);
    }
    
    .news-card-title {
        font-size: 15px;
        line-height: 1.5;
        min-height: auto;
        margin: var(--spacing-sm) 0;
        -webkit-line-clamp: 2;
    }
    
    .news-card-header {
        font-size: 12px;
        margin-bottom: 6px;
    }
    
    .news-card-footer {
        margin-top: var(--spacing-sm);
        padding-top: var(--spacing-sm);
    }
    
    .news-card-tag {
        font-size: 11px;
        padding: 4px 8px;
    }
    
    .news-card-link {
        font-size: 11px;
    }
}

@media (max-width: 480px) {
    .news-section {
        padding: var(--spacing-sm);
        margin-top: var(--spacing-sm);
    }
    
    .news-grid {
        gap: var(--spacing-sm);
    }
    
    .news-card {
        padding: var(--spacing-sm);
        border-radius: 10px;
    }
    
    .news-card-title {
        font-size: 14px;
        -webkit-line-clamp: 2;
    }
    
    .section-title {
        font-size: var(--font-size-h3);
        margin-bottom: var(--spacing-sm);
    }
}

.news-card {
    position: relative;
    background: white;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 12px;
    transition: all var(--transition-medium);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    gap: 8px;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.05);
    text-decoration: none;
    color: inherit;
}

.news-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(37, 99, 235, 0.15);
    border-color: var(--color-primary);
    text-decoration: none;
}

.news-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 11px;
    color: var(--color-text-secondary);
    margin-bottom: 4px;
}

.news-card-source {
    font-weight: 500;
    color: var(--color-primary);
}

.news-card-date {
    color: var(--color-text-light);
}

.news-card-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text);
    line-height: 1.4;
    margin: 8px 0;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    min-height: 60px;
    flex-grow: 1;
}


.news-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 6px;
    padding-top: 8px;
    border-top: 1px solid var(--color-border-light);
}

.news-card-tag {
    font-size: 10px;
    padding: 3px 6px;
    background: var(--color-accent);
    color: var(--color-primary);
    border-radius: 3px;
    font-weight: 500;
}

.news-card-link {
    display: flex;
    align-items: center;
    gap: 2px;
    font-size: 10px;
    color: var(--color-primary);
    text-decoration: none;
}

.news-card-link:hover {
    text-decoration: underline;
}

/* 관련 계산기 추천 배지 */
.news-card-related {
    position: absolute;
    top: 12px;
    right: 12px;
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 4px 8px;
    background: var(--color-primary);
    color: white;
    border-radius: 12px;
    font-size: 10px;
    cursor: pointer;
    z-index: 10;
    transition: all var(--transition-fast);
    opacity: 0;
    transform: scale(0.9);
}

.news-card:hover .news-card-related {
    opacity: 1;
    transform: scale(1);
}

.news-card-related-icon {
    font-size: 12px;
}

.news-card-related-text {
    font-weight: 500;
    font-size: 10px;
}

.news-card-related:hover {
    background: var(--color-primary-dark);
    transform: scale(1.05);
}

.news-card-image {
    position: relative;
    width: 100%;
    aspect-ratio: 1 / 1; /* 정사각형 */
    overflow: hidden;
    border-radius: 6px;
    margin-bottom: 8px;
    transition: transform var(--transition-medium);
}

.news-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.news-card:hover .news-card-image { transform: scale(1.03); }

.news-loading {
    text-align: center;
    padding: 40px 20px;
    color: var(--color-text-secondary);
}

.news-loading::after {
    content: '';
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-left: 10px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.news-error {
    text-align: center;
    padding: 40px 20px;
    color: var(--color-error);
}


/* ===================================
   Sidebar Styles
   =================================== */
.sidebar-left {
    width: 220px;
    min-width: 220px;
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    background: var(--color-surface);
    border-right: 1px solid var(--color-border);
}

.sidebar-title {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--color-primary);
}

/* 주식 지수 */
.stock-indices {
    background: white;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 12px;
}

.stock-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0;
    border-bottom: 1px solid var(--color-border-light);
}

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

.stock-name {
    font-size: 12px;
    font-weight: 500;
    color: var(--color-text);
}

.stock-value {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-text);
}

.stock-change {
    font-size: 11px;
    font-weight: 600;
    padding: 2px 6px;
    border-radius: 3px;
}

.stock-change.up {
    background: #fee2e2;
    color: #dc2626;
}

.stock-change.down {
    background: #dbeafe;
    color: #2563eb;
}

.stock-change.same {
    background: #f3f4f6;
    color: #6b7280;
}

.stock-update-time {
    font-size: 10px;
    color: var(--color-text-light);
    text-align: center;
    margin-top: 8px;
    padding-top: 8px;
    border-top: 1px solid var(--color-border-light);
}

/* 사이드바 후원 섹션 */
.sidebar-donation {
    background: white;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 12px;
    margin-bottom: var(--spacing-md);
}

.sidebar-donation-text {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-text);
    text-align: center;
    margin-bottom: 10px;
}

.sidebar-donation-buttons {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.sidebar-donation-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 12px;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    text-decoration: none;
    font-size: 12px;
    font-weight: 500;
    transition: all var(--transition-fast);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    cursor: pointer;
    position: relative;
    z-index: 1;
    pointer-events: auto;
    width: 100%;
    font-family: inherit;
}

.sidebar-donation-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
}

.sidebar-donation-btn:active {
    transform: translateY(0);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.sidebar-donation-btn:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.sidebar-donation-icon {
    font-size: 16px;
    line-height: 1;
}

.sidebar-donation-label {
    line-height: 1;
}

/* 사이드바 카카오페이 버튼 */
.sidebar-donation-kakaopay {
    background: linear-gradient(135deg, #FEE500 0%, #FDD835 100%);
    border-color: #FEE500;
    color: #3C1E1E;
}

.sidebar-donation-kakaopay:hover {
    background: linear-gradient(135deg, #FDD835 0%, #FBC02D 100%);
    border-color: #FBC02D;
    color: #3C1E1E;
}

/* 사이드바 토스 버튼 */
.sidebar-donation-toss {
    background: linear-gradient(135deg, #0064FF 0%, #0052D4 100%);
    border-color: #0064FF;
    color: #FFFFFF;
}

.sidebar-donation-toss:hover {
    background: linear-gradient(135deg, #0052D4 0%, #003D99 100%);
    border-color: #0052D4;
    color: #FFFFFF;
}

/* QR 코드 모달 */
.qr-modal {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 9999;
    align-items: center;
    justify-content: center;
}

.qr-modal[aria-hidden="false"] {
    display: flex;
}

.qr-modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
}

.qr-modal-content {
    position: relative;
    background: white;
    border-radius: 16px;
    padding: 30px;
    max-width: 400px;
    width: 90%;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    z-index: 1;
    text-align: center;
}

.qr-modal-close {
    position: absolute;
    top: 15px;
    right: 15px;
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    font-size: 28px;
    line-height: 1;
    color: var(--color-text-secondary);
    cursor: pointer;
    border-radius: 50%;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.qr-modal-close:hover {
    background: var(--color-accent);
    color: var(--color-text);
    transform: rotate(90deg);
}

.qr-modal-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-text);
    margin: 0 0 10px 0;
}

.qr-modal-description {
    font-size: 14px;
    color: var(--color-text-secondary);
    margin: 0 0 20px 0;
}

.qr-code-container {
    background: white;
    padding: 20px;
    border-radius: 12px;
    border: 2px solid var(--color-border);
    margin: 0 auto 20px;
    display: inline-block;
}

.qr-code-image {
    display: block;
    width: 250px;
    height: 250px;
    max-width: 100%;
    margin: 0 auto;
}

.qr-modal-footer {
    font-size: 12px;
    color: var(--color-text-light);
    margin: 0;
}

/* 모바일에서 QR 모달 */
@media (max-width: 768px) {
    .qr-modal-content {
        padding: 24px;
        max-width: 90%;
    }
    
    .qr-code-image {
        width: 200px;
        height: 200px;
    }
    
    .qr-modal-title {
        font-size: 18px;
    }
}

/* 통계 대시보드 팝업 */
.stats-popup {
    position: fixed;
    inset: 0;
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.stats-popup-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(1px);
    animation: fadeIn 0.3s ease;
}

.stats-popup-content {
    position: relative;
    background: white;
    border-radius: 12px;
    padding: 16px;
    max-width: 380px;
    width: 80%;
    max-height: 60vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    z-index: 1;
    animation: slideUp 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

.stats-popup-close {
    position: absolute;
    top: 12px;
    right: 12px;
    width: 28px;
    height: 28px;
    border: none;
    background: transparent;
    font-size: 24px;
    line-height: 1;
    color: var(--color-text-secondary);
    cursor: pointer;
    border-radius: 50%;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.stats-popup-close:hover {
    background: var(--color-accent);
    color: var(--color-text);
    transform: rotate(90deg);
}

.stats-popup-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-text);
    margin: 0 0 8px 0;
    text-align: center;
}

.stats-popup-dont-show-today {
    position: absolute;
    top: 42px;
    right: 12px;
    padding: 3px 6px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    color: var(--color-text-secondary);
    font-size: 10px;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.stats-popup-dont-show-today:hover {
    background: var(--color-surface-hover);
    border-color: var(--color-primary);
    color: var(--color-text);
}

.stats-popup-body {
    margin-bottom: 0;
}

.stats-summary {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-sm);
    padding: var(--spacing-xs);
    background: var(--color-surface);
    border-radius: var(--border-radius);
}

.stats-summary-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
}

.stats-label {
    font-size: var(--font-size-small);
    color: var(--color-text-secondary);
}

.stats-value {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-primary);
}

.stats-top-calculators h3 {
    font-size: 14px;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text);
}

.stats-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.stats-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--color-surface);
    border-radius: var(--border-radius);
    border: 1px solid var(--color-border);
    transition: all var(--transition-fast);
    font-size: 13px;
}

.stats-item:hover {
    background: var(--color-surface-hover);
    border-color: var(--color-primary);
    transform: translateX(4px);
}

.stats-item-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.stats-item-icon {
    font-size: 20px;
}

.stats-item-name {
    font-weight: 500;
    color: var(--color-text);
}

.stats-item-count {
    font-weight: 700;
    color: var(--color-primary);
    font-size: 14px;
}


/* 뉴스 필터 탭 */
.news-filter-tabs {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.news-filter-tab {
    padding: 6px 12px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    color: var(--color-text-secondary);
    font-size: var(--font-size-small);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.news-filter-tab:hover {
    background: var(--color-surface-hover);
    border-color: var(--color-primary);
}

.news-filter-tab.active {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

/* 모바일에서 통계 팝업 */
@media (max-width: 768px) {
    .stats-popup-content {
        padding: 16px;
        max-width: 90%;
    }
    
    .stats-popup-title {
        font-size: 18px;
    }
    
    .stats-popup-dont-show-today {
        top: 45px;
        right: 10px;
        font-size: 10px;
        padding: 3px 6px;
    }
    
    .stats-summary {
        grid-template-columns: 1fr;
    }
    
    .news-filter-tabs {
        width: 100%;
        justify-content: flex-start;
        margin-top: var(--spacing-sm);
    }
    
    .news-filter-tab {
        font-size: 11px;
        padding: 5px 10px;
    }
}

/* 계산기 네비게이션 */
.calculator-nav {
    background: white;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 12px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 10px;
    border-radius: 6px;
    cursor: pointer;
    transition: all var(--transition-fast);
    margin-bottom: 4px;
}

.nav-item:hover {
    background: var(--color-accent);
    transform: translateX(4px);
}

.nav-item.active {
    background: var(--color-primary);
    color: white;
}

.nav-icon {
    font-size: 20px;
}

.nav-label {
    font-size: 12px;
    font-weight: 500;
}

/* 사이드바 광고 */
.sidebar-ad {
    margin-top: auto;
}

/* 레이아웃 조정 */
.layout-container {
    display: flex;
    gap: var(--spacing-md);
}

.content-main {
    flex: 1;
    min-width: 0;
}

/* 모바일 반응형 - 뉴스 카드만 */
@media (max-width: 768px) {
    .news-card {
        padding: 10px;
    }
    
    .section-title {
        font-size: var(--font-size-h3);
    }
}