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

:root {
    --bg-color: #f0f4f0;
    --leaf-green: #4CAF50;
    --dark-green: #2E7D32;
    --light-green: #E8F5E9;
    --text-dark: #333;
    --card-bg: #fff;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    font-family: 'Noto Sans KR', sans-serif;
    background-color: var(--bg-color);
    background-image: radial-gradient(color-mix(in srgb, var(--leaf-green), transparent 90%) 1px, transparent 1px);
    background-size: 30px 30px;
    color: var(--text-dark);
}

header {
    background-color: white;
    padding: 40px 20px;
    text-align: center;
    border-bottom: 8px solid var(--leaf-green);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
}

.header-sub {
    font-family: 'Jua', sans-serif;
    color: #666;
    font-size: 1.2rem;
    margin-bottom: 10px;
}

.poster-title {
    font-family: 'Black Han Sans', sans-serif;
    font-size: 3.5rem;
    margin: 0;
    line-height: 1.2;
    word-break: keep-all;
    -webkit-text-stroke: 0.01px white;
    text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.1);
}

.t-dark {
    color: #333;
}

.t-green {
    color: var(--leaf-green);
}

.container {
    max-width: 1200px;
    margin: 40px auto;
    padding: 0 20px;
    display: flex;
    flex-wrap: wrap;
    gap: 30px;
}

.column {
    flex: 1;
    min-width: 400px;
    display: flex;
    flex-direction: column;
    gap: 30px;
}

@media (max-width: 900px) {
    .column {
        min-width: 100%;
    }

    .poster-title {
        font-size: 2.5rem;
    }
}

.poster-card {
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    border: 1px solid #ddd;
    display: flex;
    flex-direction: column;
}

.card-title {
    margin: 0;
    padding: 15px 20px;
    font-family: 'Do Hyeon', sans-serif;
    font-size: 1.8rem;
    color: #fff;
}

.bg-green {
    background-color: var(--dark-green);
}

.card-body {
    padding: 20px;
    font-size: 1rem;
    line-height: 1.6;
}

.card-body p {
    margin: 0 0 15px 0;
}

.card-body p:last-child {
    margin-bottom: 0;
}

.method-step {
    background: var(--light-green);
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 15px;
}

.method-step strong {
    color: var(--dark-green);
    display: block;
    margin-bottom: 5px;
}

.method-step p {
    margin: 0;
    font-size: 0.95rem;
}

.image-box {
    text-align: center;
}

.caption {
    font-size: 0.9rem;
    color: #666;
    margin-top: 5px;
    font-style: italic;
}

.conclusion {
    border-left: 5px solid var(--leaf-green);
    background: var(--light-green);
}

.reference-card .card-title {
    color: var(--dark-green);
    border-bottom: 2px solid var(--dark-green);
}

.reference-card ol {
    padding-left: 20px;
    font-size: 0.85rem;
    color: #555;
    margin: 0;
}

.reference-card li {
    margin-bottom: 8px;
}

/* Data Table */
.data-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

.data-table th,
.data-table td {
    border: 1px solid #ddd;
    padding: 12px;
    text-align: center;
}

.data-table th {
    background-color: var(--dark-green);
    color: white;
    font-family: 'Jua', sans-serif;
}

.data-table tr:nth-child(even) {
    background-color: #f9f9f9;
}

/* Back Button */
.back-btn {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: linear-gradient(135deg, var(--leaf-green) 0%, var(--dark-green) 100%);
    color: white;
    padding: 15px 25px;
    border-radius: 50px;
    text-decoration: none;
    font-family: 'Jua', sans-serif;
    font-size: 1.1rem;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
    z-index: 1000;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

.back-btn:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(76, 175, 80, 0.4);
}