/* Fonts - Pretendard */
@import url("https://cdn.jsdelivr.net/gh/orioncactus/pretendard@v1.3.9/dist/web/static/pretendard.min.css");

:root {
    --bg-color: #f0f4f8;
    --text-color: #1a202c;
    --text-secondary: #4a5568;
    --accent-color: #0d9488;
    /* 바이오 테크 느낌의 틸(Teal) 색상 */
    --accent-hover: #0f766e;
    --border-color: #cbd5e0;
    --surface-color: #ffffff;
    --bg-secondary: #f3f4f6;
}

[data-theme="dark"] {
    --bg-color: #0f172a;
    --text-color: #e2e8f0;
    --text-secondary: #94a3b8;
    --accent-color: #2dd4bf;
    --accent-hover: #14b8a6;
    --border-color: #334155;
    --surface-color: #1e293b;
    --bg-secondary: #334155;
}

/* 3D 뷰어 카드 특수 효과 */
#molecule-interaction {
    box-shadow: 0 10px 30px -10px rgba(13, 148, 136, 0.2);
    transition: transform 0.3s ease;
}

#molecule-interaction:hover {
    transform: scale(1.02);
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, "Helvetica Neue", "Segoe UI", "Apple SD Gothic Neo", "Noto Sans KR", "Malgun Gothic", "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.2s;
}

a:hover {
    color: var(--accent-color);
}

/* --- Layout --- */
.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem;
    width: 100%;
    box-sizing: border-box;
}

header {
    padding: 2rem 0;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 3rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-color);
    letter-spacing: -0.5px;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 2.5rem;
    padding: 0;
    margin: 0;
}

nav a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
}

nav a.active,
nav a:hover {
    color: var(--accent-color);
}

/* --- Hero Section --- */
.hero {
    margin-bottom: 4rem;
    text-align: left;
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-color);
    letter-spacing: -0.02em;
}

.intro-text {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin-bottom: 2rem;
    font-weight: 300;
    word-break: keep-all;
}

/* --- Buttons --- */
.btn-group {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn {
    display: inline-block;
    padding: 0.6rem 1.2rem;
    background-color: var(--accent-color);
    color: #fff;
    border-radius: 6px;
    font-weight: 500;
    font-size: 0.9rem;
    transition: transform 0.2s, box-shadow 0.2s, background-color 0.2s;
    border: 1px solid transparent;
}

.btn:hover {
    background-color: var(--accent-hover);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 51, 102, 0.2);
}

.btn-secondary {
    background-color: #333;
}

.btn-secondary:hover {
    background-color: #4b5563;
}

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--text-color);
    color: var(--text-color);
}

.btn-outline:hover {
    background-color: var(--text-color);
    color: #fff;
}


/* --- Portal/Grid --- */
.section-title {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    font-weight: 600;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.5rem;
    display: inline-block;
}

.portal-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
}

.card {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
    cursor: pointer;
    position: relative;
    /* For Status Dot positioning */
}

.card:hover {
    border-color: var(--accent-color);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
    transform: translateY(-2px);
}

.card-icon {
    font-size: 1.5rem;
    color: var(--accent-color);
}

.card h3 {
    margin: 0;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-color);
}

.card p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
}

/* Status Dot */
.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: #d1d5db;
    /* Default Gray */
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    transition: background-color 0.3s;
}

.status-dot.up {
    background-color: #10b981;
    box-shadow: 0 0 5px #10b981;
}

.status-dot.down {
    background-color: #ef4444;
}

/* --- Blog List --- */
.blog-card {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    position: relative;
    /* For pseudo-element positioning */
    overflow: hidden;
    /* Clip the strip to border-radius */
    transition: all 0.2s;
    display: block;
    text-decoration: none;
    color: inherit;
}

.blog-card::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 6px;
    /* Accent strip width */
    background-color: var(--accent-color);
    opacity: 0;
    transition: opacity 0.2s;
}

.blog-card:hover {
    border-color: var(--accent-color);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    transform: translateX(4px);
}

.blog-card:hover::before {
    opacity: 1;
}

/* --- Portfolio Page --- */
.portfolio-section {
    margin-bottom: 3rem;
}

.research-item {
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
}

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

.research-item h3 {
    margin: 0 0 0.5rem 0;
    font-size: 1.2rem;
    color: var(--text-color);
}

.research-item .meta {
    font-size: 0.85rem;
    color: var(--text-secondary);
    display: block;
    margin-bottom: 0.5rem;
    font-family: monospace;
    background: var(--bg-secondary);
    display: inline-block;
    padding: 2px 6px;
    border-radius: 4px;
}

.research-item p {
    margin: 0;
    color: var(--text-secondary);
}

/* --- Footer --- */
footer {
    margin-top: auto;
    padding: 2rem 0;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.85rem;
    border-top: 1px solid var(--border-color);
}

.social-links {
    margin-top: 1rem;
    display: flex;
    justify-content: center;
    gap: 1.5rem;
}

.social-links a {
    font-size: 1.25rem;
    color: var(--text-secondary);
    transition: color 0.2s, transform 0.2s;
}

.social-links a:hover {
    color: var(--accent-color);
    transform: translateY(-2px);
}

/* --- Animations --- */
.fade-in {
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.4s ease-out, transform 0.4s ease-out;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* --- Mobile Responsiveness --- */
@media (max-width: 768px) {
    header {
        flex-direction: column;
        gap: 1.5rem;
    }
    header nav {
        flex-direction: column !important;
        gap: 1.5rem !important;
        width: 100%;
    }
    nav ul {
        flex-wrap: wrap;
        justify-content: center;
        gap: 1rem;
    }
    .hero h1 {
        font-size: 2rem;
    }
}