:root {
    --bg: #000000;
    --card-bg: #0a0a0a;
    --card-border: #1a1a1a;
    --sky: #38bdf8;
    --text: #ffffff;
    --text-dim: #888888;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.2;
}

.highlight {
    background: linear-gradient(90deg, #38bdf8, #818cf8);

    -webkit-background-clip: text; 
    background-clip: text;      

    -webkit-text-fill-color: transparent;
    color: transparent;        
}

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

html { 
    scroll-behavior: smooth; 
}

body { 
    background-color: var(--bg); 
    color: var(--text); 
    font-family: 'Pretendard', -apple-system, sans-serif; 
    line-height: 1.6;
}

nav { 
    position: fixed; 
    top: 0; 
    width: 100%; 
    padding: 1.5rem; 
    z-index: 1000; 
    backdrop-filter: blur(10px); 
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.nav-inner { 
    max-width: 1000px; 
    margin: 0 auto; 
    display: flex; 
    justify-content: space-between; 
    align-items: center;
}

.brand { 
    font-weight: 900; 
    font-size: 0.9rem; 
    color: var(--sky);
    letter-spacing: 1px;
}

.nav-links a { 
    color: var(--text-dim); 
    text-decoration: none; 
    margin-left: 24px; 
    font-size: 0.85rem;
    transition: 0.3s;
}

.nav-links a:hover { 
    color: var(--sky); 
}

main { 
    max-width: 1000px; 
    margin: 0 auto; 
    padding: 160px 24px 80px; 
}

.section { 
    margin-bottom: 120px; 
    scroll-margin-top: 100px;
}

.section-label { 
    font-size: 20px; 
    color: var(--sky); 
    letter-spacing: 0.2em; 
    margin-bottom: 32px; 
    font-weight: 800; 
    display: block;
}

.hero { 
    margin-bottom: 100px; 
}

.badge { 
    display: inline-block; 
    padding: 6px 16px; 
    background: rgba(56, 189, 248, 0.1); 
    color: var(--sky); 
    border-radius: 100px; 
    font-size: 0.8rem; 
    font-weight: 700;
    margin-bottom: 24px; 
    border: 1px solid rgba(56, 189, 248, 0.2); 
}

h1 { 
    font-size: clamp(2.5rem, 6vw, 4rem); 
    font-weight: 800; 
    line-height: 1.1; 
    margin-bottom: 28px; 
    letter-spacing: -0.04em; 
}

.text-sky { 
    color: var(--sky); 
}

.description { 
    font-size: 1.2rem; 
    color: var(--text-dim); 
    max-width: 750px; 
    margin-bottom: 48px; 
}

.hero-buttons { 
    display: flex; 
    gap: 16px; 
    margin-bottom: 60px;
}

.btn { 
    padding: 14px 28px; 
    border-radius: 12px; 
    text-decoration: none; 
    font-weight: 700; 
    font-size: 0.9rem;
    transition: 0.3s; 
}

.btn.primary { 
    background: var(--sky); 
    color: #000; 
}

.btn.secondary { 
    border: 1px solid var(--card-border); 
    color: #fff; 
}

.btn:hover {
    transform: translateY(-3px);
}

.about-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 24px;
    padding: 48px;
    width: 100%;
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px 60px;
}

.about-item {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.about-item strong {
    font-size: 0.7rem;
    color: var(--text-dim);
    letter-spacing: 0.1em;
}

.about-item span {
    font-size: 1.1rem;
    color: var(--text);
    font-weight: 600;
}

.skills-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
}

.skill-group h3 {
    font-size: 0.9rem;
    margin-bottom: 20px;
    color: var(--text);
}

.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tags span {
    background: #111;
    padding: 6px 14px;
    border-radius: 8px;
    font-size: 0.8rem;
    border: 1px solid var(--card-border);
    color: var(--text-dim);
}

.grid-container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 24px;
    padding: 40px;
    transition: 0.3s;
}

.card:hover {
    border-color: var(--sky);
}

.card.wide {
    grid-column: span 2;
}

.date {
    font-size: 0.8rem;
    color: var(--sky);
    margin-bottom: 12px;
    display: block;
}

.project-desc {
    font-size: 1.1rem;
    margin-bottom: 20px;
}

.project-details {
    padding-left: 20px;
    margin-bottom: 24px;
    color: var(--text-dim);
    font-size: 0.9rem;
}

.minimal-timeline {
    border-top: 1px solid var(--card-border);
}

.tl-row {
    display: flex;
    padding: 32px 0;
    border-bottom: 1px solid var(--card-border);
}

.tl-year {
    width: 120px;
    font-size: 1rem;
    font-weight: 800;
    color: var(--sky);
    flex-shrink: 0;
}

.tl-events {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.tl-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.tl-org {
    font-size: 0.85rem;
    color: var(--text-dim);
    font-style: normal;
}

footer {
    text-align: center;
    padding: 80px 0;
    border-top: 1px solid var(--card-border);
    color: var(--text-dim);
    font-size: 0.8rem;
}

@media (max-width: 768px) {
    main { padding-top: 120px; }
    h1 { font-size: 2.5rem; }
    .about-grid, .grid-container { grid-template-columns: 1fr; }
    .card.wide { grid-column: span 1; }
    .tl-row { flex-direction: column; gap: 12px; }
    .tl-item { flex-direction: column; align-items: flex-start; gap: 4px; }
}

.skills-list {
    border-top: 1px solid var(--card-border);
}

.skill-row {
    display: flex;
    padding: 32px 0;
    border-bottom: 1px solid var(--card-border);
}

.skill-category {
    width: 150px;
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--sky);
    flex-shrink: 0;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.skill-tags span {
    font-size: 1rem;
    color: var(--text);
    font-weight: 500;
}

.skill-tags span::after {
    content: "/";
    margin-left: 12px;
    color: var(--card-border);
}

.skill-tags span:last-child::after {
    content: "";
}

/* 스크롤 시 상단 바 가림 방지 */
#skills {
    scroll-margin-top: 120px;
}

@media (max-width: 768px) {
    .skill-row {
        flex-direction: column;
        gap: 16px;
    }
    .skill-category {
        width: 100%;
        font-size: 0.8rem;
    }
    .skill-tags span {
        font-size: 0.9rem;
    }
}