:root {
    --bg-color: #f0f4f8;
    --text-color: #1a365d;
    --card-bg: rgba(255, 255, 255, 0.9);
    --card-border: #90cdf4;
    --nav-bg: rgba(255, 255, 255, 0.95);
    --accent-color: #3182ce;
    --grid-color: rgba(49, 130, 206, 0.1);
    --font-en: 'Courier New', monospace;
    --font-mono: 'JetBrains Mono', monospace;
    --font-sans: 'Noto Sans KR', sans-serif;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #1a1f2c;
        --text-color: #e2e8f0;
        --card-bg: rgba(26, 32, 44, 0.9);
        --card-border: #2d4ed8;
        --nav-bg: rgba(26, 32, 44, 0.95);
        --accent-color: #60a5fa;
        --grid-color: rgba(96, 165, 250, 0.1);
    }
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 배경 그리드 패턴 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        linear-gradient(var(--grid-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
    background-size: 20px 20px;
    z-index: -1;
}

body {
    font-family: var(--font-sans);
    line-height: 1.6;
    padding: 20px;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: all 0.3s;
    word-break: keep-all;
    letter-spacing: -0.025em;
}

header {
    text-align: center;
    margin-bottom: 3rem;
    position: relative;
}

header h1 {
    font-family: var(--font-en);
    font-size: 2.5rem;
    text-transform: uppercase;
    letter-spacing: 3px;
    margin-bottom: 1rem;
    position: relative;
    display: inline-block;
    font-weight: 600;
}

header h1::before {
    content: '<';
    color: var(--accent-color);
    margin-right: 1rem;
}

header h1::after {
    content: '/>';
    color: var(--accent-color);
    margin-left: 1rem;
}

header p {
    font-size: 1.1rem;
    color: var(--accent-color);
    opacity: 0.9;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

header p .en {
    font-family: var(--font-en);
    text-transform: uppercase;
    letter-spacing: 1px;
}

header p .ko {
    font-family: var(--font-sans);
    font-weight: 700;
    letter-spacing: -0.025em;
}

header p::before,
header p::after {
    content: '';
    height: 1px;
    width: 30px;
    background-color: var(--accent-color);
    opacity: 0.5;
    margin: 0 10px;
}

nav.lab-nav {
    background: var(--nav-bg);
    padding: 1rem;
    margin-bottom: 2rem;
    position: sticky;
    top: 0;
    z-index: 100;
}

nav.lab-nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    gap: 2rem;
}

nav.lab-nav a {
    font-family: var(--font-mono);
    text-decoration: none;
    color: var(--text-color);
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: background-color 0.3s;
}

nav.lab-nav a:hover {
    background-color: var(--card-border);
}

nav.lab-nav a.active {
    background-color: var(--card-border);
}

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

.lab-item {
    border: 2px solid var(--card-border);
    padding: 1.5rem;
    border-radius: 12px;
    text-align: center;
    background-color: var(--card-bg);
    transition: all 0.3s;
    cursor: pointer;
    text-decoration: none;
    color: var(--text-color);
    display: block;
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(5px);
}

.lab-item::before {
    font-family: var(--font-en);
    content: 'LAB_' attr(href);
    position: absolute;
    top: 10px;
    left: 10px;
    font-size: 0.8rem;
    color: var(--accent-color);
    opacity: 0.7;
}

.lab-item:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
    border-color: var(--accent-color);
}

.lab-item img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 8px;
    margin-bottom: 1rem;
    border: 1px solid var(--card-border);
}

.lab-item h2 {
    font-family: var(--font-en);
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--accent-color);
    font-weight: 600;
}

.lab-item p {
    font-size: 1rem;
    opacity: 0.8;
    line-height: 1.5;
}

footer {
    text-align: center;
    padding: 1rem;
    background: var(--nav-bg);
    margin-top: 2rem;
    border-top: 1px solid var(--card-border);
    backdrop-filter: blur(5px);
}

/* 다크모드 토글 버튼 수정 */
.theme-toggle {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: var(--card-bg);
    border: 2px solid var(--accent-color);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    transition: all 0.3s ease;
    backdrop-filter: blur(5px);
}

.theme-toggle:hover {
    transform: scale(1.1) rotate(45deg);
}

.theme-toggle svg {
    width: 24px;
    height: 24px;
    fill: var(--accent-color);
}

/* 다크모드 강제 적용을 위한 클래스 */
[data-theme="dark"] {
    --bg-color: #1a1a1a;
    --text-color: #ffffff;
    --card-bg: #2d2d2d;
    --card-border: #404040;
    --nav-bg: #2d2d2d;
}

[data-theme="light"] {
    --bg-color: #ffffff;
    --text-color: #333333;
    --card-bg: #ffffff;
    --card-border: #dddddd;
    --nav-bg: #f4f4f4;
}