:root {
    --primary-color: #154c79;
    --accent-color: #2b7bc6;
    --bg-color: #f0f4f8;
    --highlight-bg: #eef7ff;
    --highlight-border: #5fa8eb;
}

body {
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, 'Helvetica Neue', 'Segoe UI', 'Apple SD Gothic Neo', 'Noto Sans KR', 'Malgun Gothic', sans-serif;
    background-color: var(--bg-color);
    margin: 0;
    padding: 20px;
    color: #333;
    line-height: 1.6;
}
.container {
    max-width: 800px;
    margin: 0 auto;
}

header {
    text-align: center;
    margin-bottom: 50px;
    padding: 40px 0;
    background: white;
    border-radius: 20px;
    box-shadow: 0 4px 20px rgba(21, 76, 121, 0.08);
    border-top: 5px solid var(--primary-color);
}
h1 { 
    margin: 0; 
    color: var(--primary-color); 
    font-size: 1.8rem; 
    letter-spacing: -0.5px; 
    font-weight: 800;
}
p.subtitle { 
    color: #5d758a;
    margin-top: 12px; 
    font-size: 1.05rem; 
}

.month-section { margin-bottom: 50px; }
.month-title {
    border-bottom: 2px solid #ccdbe8;
    padding-bottom: 10px;
    margin-bottom: 20px;
    font-size: 1.4rem;
    color: var(--primary-color);
    font-weight: 700;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.card {
    background: white;
    border: 1px solid #e1e8ed;
    border-radius: 16px;
    padding: 25px;
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: relative;
    box-shadow: 0 2px 5px rgba(0,0,0,0.02);
}
.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(21, 76, 121, 0.12);
    border-color: var(--accent-color);
}

.card.latest {
    background-color: var(--highlight-bg);
    border: 2px solid var(--highlight-border);
}

.badge-new {
    position: absolute;
    top: -10px;
    right: -10px;
    background: #e53935;
    color: white;
    font-size: 0.8rem;
    font-weight: bold;
    padding: 5px 12px;
    border-radius: 20px;
    box-shadow: 0 3px 6px rgba(0,0,0,0.15);
    animation: bounce 2s infinite;
}

.card-date {
    font-size: 0.9rem;
    color: #78909c;
    font-weight: 600;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 5px;
}
.card.latest .card-date {
    color: var(--accent-color);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 700;
    line-height: 1.45;
    margin-bottom: 25px;
    word-break: keep-all;
    color: #2c3e50;
}

.card-icon {
    align-self: flex-end;
    font-size: 0.9rem;
    color: var(--primary-color);
    font-weight: 600;
    background: #f1f6fa;
    padding: 8px 15px;
    border-radius: 8px;
    transition: background 0.2s;
}
.card:hover .card-icon {
    background: var(--primary-color);
    color: white;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {transform: translateY(0);}
    40% {transform: translateY(-5px);}
    60% {transform: translateY(-3px);}
}

@media (max-width: 600px) {
    h1 { font-size: 1.5rem; }
    .container { padding: 0 10px; }
}