/* ========================================
   금융 계산기 - 공통 스타일
   ======================================== */

:root {
    /* 색상 팔레트 */
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --secondary-color: #10b981;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
        'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    color: var(--text-primary);
    background-color: var(--bg-light);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* 헤더 */
.header {
    background: var(--bg-white);
    border-bottom: 1px solid #e2e8f0;
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(8px);
    background: rgba(255, 255, 255, 0.95);
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.25rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.625rem;
    transition: opacity 0.3s;
}

.logo:hover {
    opacity: 0.8;
}

.logo-icon {
    color: var(--primary-color);
    flex-shrink: 0;
}

.nav-menu {
    display: flex;
    gap: 2.5rem;
    list-style: none;
}

.nav-menu a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.2s;
    position: relative;
}

.nav-menu a:hover {
    color: var(--text-primary);
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -0.5rem;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.3s;
}

.nav-menu a:hover::after {
    width: 100%;
}

/* 모바일 메뉴 버튼 */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-primary);
}

/* 메인 컨테이너 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

/* 페이지 헤더 */
.page-header {
    text-align: center;
    margin-bottom: 3rem;
}

.page-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.page-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* 카드 스타일 */
.card {
    background: var(--bg-white);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow-md);
    transition: transform 0.3s, box-shadow 0.3s;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

/* 버튼 스타일 */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    display: inline-block;
    text-decoration: none;
    text-align: center;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

.btn-block {
    width: 100%;
}

/* 폼 스타일 */
.form-group {
    margin-bottom: 1.5rem;
}

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

.form-input {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

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

.form-select {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    background-color: white;
    cursor: pointer;
}

.input-unit {
    position: relative;
}

.input-unit input {
    padding-right: 3rem;
}

.input-unit::after {
    content: attr(data-unit);
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    font-weight: 500;
}

/* 결과 카드 */
.result-card {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    border-radius: 12px;
    padding: 2rem;
    margin-top: 2rem;
}

.result-title {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
    opacity: 0.9;
}

.result-value {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.result-detail {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    padding: 1rem;
    margin-top: 1rem;
}

.result-detail-item {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

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

/* 푸터 */
.footer {
    background: var(--text-primary);
    color: white;
    padding: 3rem 1.5rem 2rem;
    margin-top: 4rem;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    margin-bottom: 1rem;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.3s;
}

.footer-links a:hover {
    color: white;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 2rem;
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
}

/* 레이아웃 그리드 */
.layout-grid {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 2rem;
}

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

.sidebar {
    position: sticky;
    top: 100px;
    height: fit-content;
}

/* 반응형 디자인 */
@media (max-width: 640px) {
    /* 헤더 최적화 */
    .header-container {
        padding: 1rem;
    }
    
    .logo {
        font-size: 1.125rem;
    }
    
    .nav-menu {
        display: none;
    }
    
    .mobile-menu-btn {
        display: block;
        font-size: 1.5rem;
        padding: 0.5rem;
    }
    
    /* 컨테이너 여백 축소 */
    .container {
        padding: 1rem;
    }
    
    /* 페이지 헤더 */
    .page-header {
        padding: 1.5rem 0;
        margin-bottom: 1.5rem;
    }
    
    .page-title {
        font-size: 1.75rem;
        line-height: 1.3;
    }
    
    .page-subtitle {
        font-size: 0.9rem;
        line-height: 1.5;
    }
    
    /* 레이아웃 */
    .layout-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .sidebar {
        position: static;
        order: 2;
    }
    
    /* 카드 */
    .card {
        padding: 1.25rem;
        margin-bottom: 1rem;
    }
    
    /* 폼 요소 */
    .form-group {
        margin-bottom: 1.25rem;
    }
    
    .form-label {
        font-size: 0.9rem;
        margin-bottom: 0.5rem;
    }
    
    .form-input,
    .form-select {
        font-size: 1rem;
        padding: 0.75rem;
        min-height: 48px; /* 터치 최적화 */
    }
    
    /* 버튼 */
    .btn {
        padding: 0.875rem 1.5rem;
        font-size: 1rem;
        min-height: 48px; /* 터치 최적화 */
    }
    
    .btn-block {
        width: 100%;
    }
    
    /* 결과 섹션 */
    .result-card {
        padding: 1.5rem;
    }
    
    .result-title {
        font-size: 0.95rem;
    }
    
    .result-value {
        font-size: 1.875rem;
        line-height: 1.2;
    }
    
    .result-subtitle {
        font-size: 0.875rem;
    }
    
    .result-detail {
        gap: 0.75rem;
    }
    
    .result-detail-item {
        font-size: 0.9rem;
    }
    
    /* 테이블 */
    table {
        font-size: 0.875rem;
    }
    
    table th,
    table td {
        padding: 0.5rem 0.375rem;
    }
    
    /* 사이드바 카드 간격 축소 */
    .sidebar .card {
        margin-bottom: 1rem;
    }
    
    /* Footer */
    .footer {
        padding: 2rem 1rem;
        font-size: 0.875rem;
    }
}

/* 모바일 하단 네비게이션 바 (앱 스타일) */
.mobile-bottom-nav {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: white;
    border-top: 1px solid #e5e7eb;
    padding: 0.5rem 0 calc(0.5rem + env(safe-area-inset-bottom));
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.05);
    z-index: 1000;
}

.mobile-bottom-nav .nav-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    color: #9ca3af;
    transition: all 0.2s ease;
    padding: 0.5rem;
    border-radius: 12px;
    position: relative;
}

.mobile-bottom-nav .nav-item:active {
    transform: scale(0.95);
}

.mobile-bottom-nav .nav-item.active {
    color: #2563eb;
}

.mobile-bottom-nav .nav-item.active::before {
    content: '';
    position: absolute;
    top: -0.5rem;
    left: 50%;
    transform: translateX(-50%);
    width: 32px;
    height: 3px;
    background: #2563eb;
    border-radius: 0 0 3px 3px;
}

.mobile-bottom-nav .nav-icon {
    width: 24px;
    height: 24px;
    margin-bottom: 0.25rem;
    transition: transform 0.2s ease;
    stroke-width: 2;
}

.mobile-bottom-nav .nav-item.active .nav-icon {
    transform: scale(1.05);
    stroke-width: 2.5;
}

.mobile-bottom-nav .nav-label {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: -0.01em;
}

/* 모바일에서 하단 네비게이션 표시 */
@media (max-width: 768px) {
    .mobile-bottom-nav {
        display: flex;
        justify-content: space-around;
        align-items: center;
    }
    
    /* 모바일에서 상단 헤더 완전히 숨김 */
    .header {
        display: none !important;
    }
    
    header {
        display: none !important;
    }
    
    /* 모바일에서 body에 하단 네비게이션 바 높이만큼 패딩 추가 */
    body {
        padding-bottom: calc(70px + env(safe-area-inset-bottom));
        padding-top: 0 !important;
    }
    
    .footer {
        margin-bottom: 0 !important;
    }
}

/* 작은 모바일 화면 (스마트폰) */
@media (max-width: 480px) {
    .header-container {
        padding: 0.875rem;
    }
    
    .logo {
        font-size: 1rem;
    }
    
    .logo-icon {
        font-size: 1.125rem;
    }
    
    .container {
        padding: 0.75rem;
    }
    
    .page-header {
        padding: 1rem 0;
        margin-bottom: 1rem;
    }
    
    .page-title {
        font-size: 1.5rem;
    }
    
    .page-subtitle {
        font-size: 0.85rem;
    }
    
    .card {
        padding: 1rem;
        border-radius: 12px;
    }
    
    .form-group {
        margin-bottom: 1rem;
    }
    
    .form-label {
        font-size: 0.875rem;
    }
    
    .result-value {
        font-size: 1.625rem;
    }
    
    .result-title {
        font-size: 0.875rem;
    }
    
    .result-subtitle {
        font-size: 0.8rem;
    }
    
    table {
        font-size: 0.8rem;
    }
    
    table th,
    table td {
        padding: 0.4rem 0.25rem;
    }
    
    /* 차트 높이 조정 */
    canvas {
        max-height: 250px;
    }
}

/* 유틸리티 클래스 */
.text-center {
    text-align: center;
}

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.hidden {
    display: none;
}