@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+KR:wght@400;500;700&display=swap');

:root {
    --primary-color: #2c3e50;
    --secondary-color: #34495e;
    --accent-color: #41b883;
    --text-color: #ecf0f1;
    --bg-color: #2c3e50;
    --card-bg: #34495e;
    --card-hover-bg: #4a627a;
    --border-color: rgba(255, 255, 255, 0.1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans KR', sans-serif;
    margin: 0;
    color: var(--text-color);
    background-color: var(--bg-color);
    line-height: 1.7;
}

/* --- 상단 네비게이션 --- */
.main-navigation {
    background: rgba(0, 0, 0, 0.2);
    padding: 10px 20px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    color: #fff;
    font-weight: 700;
    font-size: 18px;
    text-decoration: none;
}

.main-navigation nav a {
    color: rgba(255, 255, 255, 0.85);
    text-decoration: none;
    margin-left: 20px;
    font-size: 16px;
}

/* --- 메인 컨테이너 및 헤더 --- */
.container {
    max-width: 700px;
    margin: 30px auto;
    padding: 20px;
}

h1, h2 {
    text-align: center;
    color: #fff;
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 15px;
}

h1 { font-size: 28px; }
.submenu { display: flex; justify-content: center; gap: 15px; margin-bottom: 30px; padding-bottom: 20px; border-bottom: 1px solid rgba(255, 255, 255, 0.2); }
.submenu a { color: rgba(255, 255, 255, 0.8); text-decoration: none; font-weight: 500; padding: 8px 12px; border-radius: 8px; transition: all 0.2s ease; }
.submenu a:hover { background: rgba(255, 255, 255, 0.1); color: #fff; }
.submenu a.active { background: rgba(255, 255, 255, 0.2); color: #fff; font-weight: 700; }
h2 { font-size: 22px; margin-top: 40px; }
h3 { font-size: 18px; color: var(--accent-color); margin-top: 20px; }

/* --- 품목 선택 UI --- */
.selector-box {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 12px;
}

#searchInput {
    width: 100%;
    padding: 15px;
    font-size: 16px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--primary-color);
    color: #fff;
    box-sizing: border-box;
    margin-bottom: 20px;
}

.category-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 20px;
}

.category-filters button {
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 8px 15px;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.category-filters button:hover {
    background-color: var(--card-hover-bg);
}

.category-filters button.active {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
    font-weight: bold;
}

.selection-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
    gap: 10px;
    min-height: 100px;
}

.selection-card {
    background: var(--input-bg-color);
    padding: 15px;
    border-radius: 8px;
    cursor: pointer;
    border: 1px solid var(--border-color);
    transition: all 0.2s ease;
    text-align: center;
}

.selection-card:hover {
    background-color: var(--card-hover-bg);
    transform: translateY(-2px);
}

.selection-card.selected {
    border-color: var(--accent-color);
    background-color: var(--secondary-color);
    box-shadow: 0 0 15px rgba(65, 184, 131, 0.3);
}

.item-card-path { font-size: 12px; opacity: 0.7; }
.item-card-name { font-weight: 500; font-size: 15px; }
.item-card-sub { font-size: 12px; opacity: 0.8; margin-top: 4px; }
.item-card-lifespan { font-size: 14px; color: var(--accent-color); font-weight: bold; margin-top: 8px; }

/* --- 계산 영역 --- */
#calculationArea {
    display: none;
    background: var(--card-bg);
    padding: 20px;
    border-radius: 12px;
    margin-top: 30px;
}

#selectedItemInfo {
    text-align: center;
    margin-bottom: 20px;
    padding: 15px;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 8px;
}

.calc-mode-selector {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.calc-mode-selector label {
    flex-grow: 1;
    padding: 15px;
    text-align: center;
    cursor: pointer;
    border: 1px solid var(--border-color);
    border-radius: 8px;
}

.calc-mode-selector input[type="radio"] {
    display: none;
}

.calc-mode-selector input[type="radio"]:checked+label {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
    font-weight: bold;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 12px;
    font-size: 16px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--primary-color);
    color: #fff;
    box-sizing: border-box;
}

#mainCalcBtn {
    width: 100%;
    padding: 15px;
    font-size: 18px;
    font-weight: 700;
    border: none;
    background-color: var(--accent-color);
    color: #fff;
    border-radius: 8px;
    cursor: pointer;
    margin-top: 20px;
}

#result-area {
    margin-top: 20px;
    padding: 20px;
    background: var(--primary-color);
    border-radius: 8px;
}

/* --- 팝업(모달) --- */
.modal-overlay {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.7);
    justify-content: center;
    align-items: center;
}

.modal-content {
    background-color: var(--card-bg);
    margin: auto;
    padding: 30px;
    border: 1px solid var(--border-color);
    width: 90%;
    max-width: 800px;
    border-radius: 15px;
    position: relative;
    max-height: 80vh;
    overflow-y: auto;
}

.close-btn {
    color: #aaa;
    position: absolute;
    top: 15px;
    right: 25px;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}

.modal-content ul {
    list-style-position: inside;
    padding-left: 0;
}

blockquote {
    background: rgba(0, 0, 0, 0.2);
    border-left: 3px solid var(--accent-color);
    padding: 10px;
    margin: 10px 0;
}

.footer-link {
    text-align: center;
    margin-top: 40px;
}

.footer-link a {
    color: var(--accent-color);
}