:root {
    --primary: #6366f1;
    --primary-light: #818cf8;
    --bg-dark: #0f172a;
    --bg-card: rgba(30, 41, 59, 0.7);
    --text-white: #f8fafc;
    --text-muted: #94a3b8;
    --glass-border: rgba(255, 255, 255, 0.1);
    --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', 'Noto Sans KR', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-white);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Background Blobs */
.blob-bg {
    position: fixed;
    top: -10%;
    right: -5%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.15) 0%, transparent 70%);
    z-index: -1;
    filter: blur(50px);
    animation: float 20s infinite alternate;
}

.blob-2 {
    bottom: -10%;
    left: -5%;
    top: auto;
    right: auto;
    background: radial-gradient(circle, rgba(168, 85, 247, 0.15) 0%, transparent 70%);
    animation: float 25s infinite alternate-reverse;
}

@keyframes float {
    0% { transform: translate(0, 0); }
    100% { transform: translate(50px, 100px); }
}

/* Navigation */
nav {
    position: fixed;
    top: 0;
    width: 100%;
    padding: 1.5rem 0;
    z-index: 1000;
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--glass-border);
}

nav .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: 2px;
    background: linear-gradient(45deg, var(--primary), #a855f7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    display: flex;
    gap: 2.5rem;
    list-style: none;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-white);
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
    opacity: 0.7;
}

.nav-links a:hover {
    opacity: 1;
    color: var(--primary-light);
}

/* Hero Section */
header#hero {
    height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
}

.hero-content h2 {
    font-size: 1.5rem;
    font-weight: 300;
    color: var(--primary-light);
    margin-bottom: 0.5rem;
}

.hero-content h1 {
    font-size: 4.5rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    line-height: 1.1;
}

.hero-content p {
    font-size: 1.2rem;
    color: var(--text-muted);
    max-width: 600px;
    margin-bottom: 2.5rem;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
}

.btn {
    padding: 0.8rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    transition: var(--transition);
}

.btn.primary {
    background-color: var(--primary);
    color: white;
    box-shadow: 0 10px 20px rgba(99, 102, 241, 0.2);
}

.btn.primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 30px rgba(99, 102, 241, 0.3);
}

.btn.secondary {
    border: 1px solid var(--glass-border);
    color: var(--text-white);
    background: rgba(255, 255, 255, 0.05);
}

.btn.secondary:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* Sections */
section {
    padding: 8rem 0;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3.5rem;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 60px;
    height: 4px;
    background: var(--primary);
    border-radius: 2px;
}

/* About Me */
.about-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 4rem;
}

.about-text p {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    color: var(--text-muted);
}

.about-info {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: 20px;
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
}

.info-item {
    margin-bottom: 1.5rem;
}

.info-item:last-child { margin-bottom: 0; }

.info-item .label {
    display: block;
    font-size: 0.8rem;
    text-transform: uppercase;
    color: var(--primary-light);
    letter-spacing: 1px;
    margin-bottom: 0.3rem;
}

.info-item .value {
    font-weight: 500;
}

/* Skills */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
}

.skill-card {
    background: var(--bg-card);
    padding: 2.5rem;
    border-radius: 24px;
    border: 1px solid var(--glass-border);
    transition: var(--transition);
}

.skill-card:hover {
    transform: translateY(-10px);
    border-color: var(--primary);
    background: rgba(30, 41, 59, 0.9);
}

.skill-card i {
    width: 48px;
    height: 48px;
    color: var(--primary);
    margin-bottom: 1.5rem;
}

.skill-card h3 {
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.skill-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* Experience Timeline */
.timeline {
    position: relative;
    max-width: 900px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 15px;
    top: 0;
    width: 2px;
    height: 100%;
    background: linear-gradient(to bottom, var(--primary), transparent);
}

.timeline-item {
    padding-left: 60px;
    margin-bottom: 4rem;
    position: relative;
}

.timeline-item .time {
    font-size: 0.9rem;
    color: var(--primary-light);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.timeline-item .dot {
    position: absolute;
    left: 0;
    top: 5px;
    width: 30px;
    height: 30px;
    background: var(--bg-dark);
    border: 3px solid var(--primary);
    border-radius: 50%;
    z-index: 2;
}

.timeline-item .content {
    background: var(--bg-card);
    padding: 2.5rem;
    border-radius: 24px;
    border: 1px solid var(--glass-border);
}

.timeline-item .content h3 {
    font-size: 1.4rem;
    margin-bottom: 0.3rem;
}

.timeline-item .company {
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    font-weight: 500;
}

.timeline-item ul {
    list-style: none;
}

.timeline-item li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.8rem;
    color: var(--text-muted);
}

.timeline-item li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--primary);
}

/* Education */
.edu-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.edu-card {
    background: var(--bg-card);
    padding: 2.5rem;
    border-radius: 24px;
    border: 1px solid var(--glass-border);
}

.edu-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.edu-card h3 {
    font-size: 1.2rem;
    max-width: 70%;
}

.edu-card .date {
    color: var(--primary-light);
    font-weight: 600;
    font-size: 0.9rem;
}

.edu-card p {
    color: var(--text-muted);
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeIn 0.8s forwards;
}

.delay-1 { animation-delay: 0.2s; }
.delay-2 { animation-delay: 0.4s; }
.delay-3 { animation-delay: 0.6s; }

@keyframes fadeIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.reveal {
    opacity: 0;
    transform: translateY(50px);
    transition: all 1s ease-out;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* Footer */
footer {
    padding: 4rem 0;
    border-top: 1px solid var(--glass-border);
    text-align: center;
    color: var(--text-muted);
}

/* Responsive */
@media (max-width: 768px) {
    .container { padding: 0 1.5rem; }
    .hero-content h1 { font-size: 3rem; }
    .about-grid { grid-template-columns: 1fr; }
    .edu-grid { grid-template-columns: 1fr; }
    .nav-links { display: none; }
}