/* 기본 리셋 및 변수 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #4f46e5;
    --primary-dark: #4338ca;
    --secondary-color: #10b981;
    --text-color: #1f2937;
    --text-light: #6b7280;
    --bg-color: #f9fafb;
    --card-bg: #ffffff;
    --input-bg: #ffffff;
    --footer-bg: #1f2937;
    --border-color: #e5e7eb;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
}

/* 다크모드 변수 */
body.dark-mode, html.dark-mode body {
    --text-color: #f9fafb;
    --text-light: #d1d5db;
    --bg-color: #1f2937;
    --card-bg: #374151;
    --input-bg: #4b5563;
    --footer-bg: #111827;
    --border-color: #6b7280;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.3);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica', 'Arial', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Enable theme transitions only after JS has determined initial theme to avoid flash */
body.theme-ready {
    transition: background-color 0.3s ease, color 0.3s ease;
} 

/* 헤더 */
header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 2rem 0;
    box-shadow: var(--shadow-lg);
}

header h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.tagline {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1rem;
}

/* 테마 토글 버튼 */
.theme-toggle {
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: rotate(20deg);
}

.theme-icon {
    display: block;
}

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

/* 페이지 레이아웃 (사이드바 + 메인) */
.page-wrapper {
    display: flex;
    flex: 1;
    min-height: 0;
}

/* 사이드바 */
.sidebar {
    width: 260px;
    flex-shrink: 0;
    background: var(--card-bg);
    border-right: 1px solid var(--border-color);
    padding: 1.5rem 0;
    box-shadow: var(--shadow);
    transition: width 0.3s ease, background 0.3s, border-color 0.3s;
    overflow: hidden;
}

/* 데스크톱: 사이드바 토글(접기) - 축소 시 아이콘 전용 너비로 변경 */
@media (min-width: 769px) {
    .sidebar.sidebar-collapsed {
        width: 72px; /* 축소 너비 */
        padding-top: 1rem;
        border-right-width: 1px;
    }

    /* 축소 시 텍스트 숨기고 아이콘 중앙 정렬 */
    .sidebar.sidebar-collapsed .sidebar-nav a {
        padding: 0.6rem 0.4rem;
        justify-content: center;
        text-align: center;
    }

    .sidebar .sidebar-nav a {
        display: flex;
        align-items: center;
        gap: 0.75rem;
        position: relative; /* for tooltip positioning */
    }

    .sidebar .nav-icon {
        font-size: 1.4rem;
        width: 28px;
        display: inline-flex;
        justify-content: center;
    }

    .sidebar .nav-text { display: inline; }
    .sidebar.sidebar-collapsed .nav-text { display: none !important; }

    /* abbreviation: hidden by default, shown when sidebar is collapsed */
    .sidebar .nav-abbrev { display: none; font-weight: 600; font-size: 0.95rem; width: 28px; justify-content: center; }
    .sidebar.sidebar-collapsed .nav-abbrev { display: inline-flex; justify-content: center; }

    /* 축소 모드에서 카테고(섹션 레이블)와 구분선 숨김 */
    .sidebar.sidebar-collapsed .nav-category,
    .sidebar.sidebar-collapsed .nav-divider { display: none !important; }

    /* 툴팁 스타일 (축소된 사이드바에서 호버 시) */
    .sidebar.sidebar-collapsed .sidebar-nav a::after {
        content: attr(data-label);
        position: absolute;
        left: 84px;
        top: 50%;
        transform: translateY(-50%);
        background: var(--card-bg);
        color: var(--text-color);
        padding: 0.45rem 0.75rem;
        border-radius: 8px;
        box-shadow: var(--shadow-lg);
        display: inline-block;
        white-space: nowrap;
        max-width: 220px;
        overflow: hidden;
        text-overflow: ellipsis;
        z-index: 1000;
        font-size: 0.95rem;
        border: 1px solid var(--border-color);
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
        transition: opacity 0.15s ease, visibility 0.15s ease;
    }

    .sidebar.sidebar-collapsed .sidebar-nav a:hover::after {
        opacity: 1;
        visibility: visible;
    }

    /* 토글 항목: 메뉴 목록의 첫 항목으로 이동 - 툴팁 스타일 수정 */
    .sidebar.sidebar-collapsed .toggle-item .sidebar-local-toggle::after {
        content: attr(title);
        position: absolute;
        left: 84px;
        top: 50%;
        transform: translateY(-50%);
        background: var(--card-bg);
        color: var(--text-color);
        padding: 0.35rem 0.6rem;
        border-radius: 8px;
        box-shadow: var(--shadow-lg);
        display: inline-block;
        white-space: nowrap;
        max-width: 220px;
        overflow: hidden;
        text-overflow: ellipsis;
        z-index: 1000;
        font-size: 0.9rem;
        border: 1px solid var(--border-color);
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
        transition: opacity 0.15s ease, visibility 0.15s ease;
    }

    .sidebar.sidebar-collapsed .toggle-item .sidebar-local-toggle:hover::after,
    .sidebar.sidebar-collapsed .toggle-item .sidebar-local-toggle:focus::after {
        opacity: 1;
        visibility: visible;
    }

    /* 토글 리스트 아이템 스타일 */
    .toggle-item { padding-top: 0.35rem; padding-bottom: 0.35rem; }
    .toggle-item .nav-icon { font-size: 1.25rem; }
    .sidebar-local-toggle { /* anchor 스타일과 통일 */
        background: transparent;
        border: none;
        padding: 0;
        color: var(--text-light);
    }

    /* 데스크톱에서는 헤더의 사이드바 토글을 숨김 (사이드바 내 토글 사용) */
    header .sidebar-toggle { display: none; }
}

.sidebar-nav {
    list-style: none;
}

.sidebar-nav .nav-category {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.75rem 1.5rem 0.35rem;
    margin-top: 0.5rem;
}

.sidebar-nav .nav-category:first-child {
    margin-top: 0;
}

.sidebar-nav a {
    display: block;
    padding: 0.5rem 1.5rem;
    color: var(--text-color);
    text-decoration: none;
    font-size: 0.95rem;
    border-left: 3px solid transparent;
    margin-left: 0;
    transition: background 0.2s, border-color 0.2s, color 0.2s;
}

.sidebar-nav a:hover {
    background: var(--bg-color);
    color: var(--primary-color);
}

.sidebar-nav a.active {
    border-left-color: var(--primary-color);
    background: var(--bg-color);
    color: var(--primary-color);
    font-weight: 600;
}

.sidebar-nav .nav-divider {
    height: 1px;
    background: var(--border-color);
    margin: 0.75rem 1rem;
}

/* 메인 콘텐츠 영역 (사이드바 옆) */
.page-wrapper main {
    flex: 1;
    min-width: 0;
    padding: 2rem 1.5rem;
}

.page-wrapper main.container {
    max-width: none;
    margin: 0;
    padding: 2rem 1.5rem;
}

/* 사이드바 토글 버튼 (데스크톱·모바일 공통) */
.sidebar-toggle {
    display: flex;
    background: transparent; /* 배경 제거 */
    border: none;
    box-shadow: none;
    color: white;
    padding: 0.35rem;
    cursor: pointer;
    font-size: 1.25rem;
    align-items: center;
    justify-content: center;
    margin-right: 0.5rem;
    width: 40px;
    height: 40px;
}

/* 사이드바 상단 로컬 토글 기본 (아이콘 전용, 배경 없음) */
.sidebar-local-toggle {
    background: transparent;
    border: none;
    box-shadow: none;
    padding: 0.35rem;
    cursor: pointer;
    color: var(--text-light);
    font-size: 1.15rem;
}

/* hover 시 색상 변화로 피드백 제공 (배경 없음) */
.sidebar-toggle:hover,
.sidebar-local-toggle:hover {
    color: var(--primary-color);
}

.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    z-index: 99;
    opacity: 0;
    transition: opacity 0.3s;
}

.sidebar-overlay.show {
    opacity: 1;
}

@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: -260px;
        top: 0;
        bottom: 0;
        z-index: 100;
        overflow-y: auto;
        transition: left 0.3s ease;
    }

    .sidebar.open {
        left: 0;
    }

    .sidebar-overlay.show {
        display: block;
    }

    .page-wrapper main,
    .page-wrapper main.container {
        padding: 1.5rem 1rem;
    }
}

/* 메인 (페이지 레이아웃 없을 때 호환) */
body:not(:has(.page-wrapper)) main {
    flex: 1;
    padding: 2rem 0;
}

/* Hero 섹션 */
.hero {
    text-align: center;
    margin-bottom: 3rem;
    padding: 2rem;
    background: var(--card-bg);
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.hero h2 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.hero p {
    color: var(--text-light);
    font-size: 1.1rem;
}

/* 도구 그리드 */
.tools-grid {
    margin-bottom: 3rem;
}

.tools-grid h3 {
    margin: 2rem 0 1rem;
    color: var(--text-color);
    font-size: 1.5rem;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.tool-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    text-decoration: none;
    color: var(--text-color);
    border: 2px solid transparent;
    position: relative;
}

.tool-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.tool-card.coming-soon {
    opacity: 0.6;
    cursor: not-allowed;
}

.tool-card.coming-soon:hover {
    transform: none;
    border-color: transparent;
}

.tool-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.tool-card h4 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.tool-card p {
    color: var(--text-light);
    font-size: 0.95rem;
    line-height: 1.5;
}

.badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: var(--text-light);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
}

/* 푸터 */
footer {
    background: var(--footer-bg);
    color: white;
    text-align: center;
    padding: 2rem 0;
    margin-top: auto;
}

footer p {
    opacity: 0.8;
}

/* 계산기 페이지 스타일 */
.calc-container {
    max-width: 1000px;
    margin: 0 auto;
}

.calc-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.calc-card h2 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    color: var(--text-color);
}

.deposit-tabs {
    display: flex;
    gap: 0.5rem;
}

.tab-btn {
    padding: 0.5rem 0.9rem;
    border: 1px solid var(--border-color);
    background: transparent;
    border-radius: 8px;
    cursor: pointer;
}

.tab-btn.active {
    background: rgba(79, 70, 229, 0.08);
    border-color: var(--primary-color);
}

.form-group {
    margin-bottom: 1.5rem;
}

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

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

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

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.btn {
    background: var(--primary-color);
    color: white;
    padding: 1rem 2rem;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s;
    width: 100%;
}

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

/* 결과 표시 */
.result-section {
    display: none;
    margin-top: 2rem;
}

.result-section.show {
    display: block;
}

.result-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.result-card {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 1.5rem;
    border-radius: 12px;
    text-align: center;
}

.result-card.secondary {
    background: linear-gradient(135deg, var(--secondary-color) 0%, #059669 100%);
}

.result-card h3 {
    font-size: 0.9rem;
    opacity: 0.9;
    margin-bottom: 0.5rem;
}

.result-card .value {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.result-card .unit {
    font-size: 0.9rem;
    opacity: 0.8;
}

/* 테이블 */
.table-container {
    overflow-x: auto;
    margin-top: 2rem;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: var(--card-bg);
    transition: background-color 0.3s ease;
}

table th,
table td {
    padding: 1rem;
    text-align: right;
    border-bottom: 1px solid var(--border-color);
    transition: border-color 0.3s ease;
}

table th {
    background: var(--bg-color);
    font-weight: 600;
    color: var(--text-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

table td {
    color: var(--text-light);
    transition: color 0.3s ease;
}

table tr:hover {
    background: var(--bg-color);
    transition: background-color 0.3s ease;
}

/* 반응형 */
@media (max-width: 768px) {
    header h1 {
        font-size: 1.5rem;
    }
    
    .hero h2 {
        font-size: 1.5rem;
    }
    
    .grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .result-cards {
        grid-template-columns: 1fr;
    }
}