:root {
    --bg-dark: #060d17;
    --bg-darker: #02060b;
    --cyan: #00f2fe;
    --cyan-glow: rgba(0, 242, 254, 0.4);
    --blue: #4facfe;
    --text-main: #f8f9fa;
    --text-muted: #94a3b8;
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.08);
}

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

body {
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    padding: 20px 0;
    z-index: 1000;
    transition: all 0.3s ease;
    background: transparent;
}

.navbar.scrolled {
    background: rgba(6, 13, 23, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
    padding: 15px 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo img {
    height: 48px;
    filter: drop-shadow(0 0 8px rgba(255, 255, 255, 0.5));
}

.nav-links a {
    color: var(--text-main);
    text-decoration: none;
    margin-left: 30px;
    font-size: 0.95rem;
    font-weight: 500;
    transition: color 0.3s;
}

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

.btn-outline {
    border: 1px solid var(--glass-border);
    padding: 10px 24px;
    border-radius: 30px;
    transition: all 0.3s ease;
}

.nav-links .btn-outline:hover {
    border-color: var(--cyan);
    box-shadow: 0 0 15px var(--cyan-glow);
}

/* Hero Section */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding: 0 30px;
    overflow: hidden;
}

.hero-bg-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60vw;
    height: 60vw;
    background: radial-gradient(circle, rgba(0, 242, 254, 0.15) 0%, rgba(6, 13, 23, 0) 70%);
    z-index: -1;
    animation: pulseGlow 8s infinite alternate;
}

@keyframes pulseGlow {
    0% { transform: translate(-50%, -50%) scale(1); opacity: 0.8; }
    100% { transform: translate(-50%, -50%) scale(1.1); opacity: 1; }
}

.hero-content {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
    z-index: 10;
}

.badge {
    display: inline-block;
    padding: 6px 16px;
    background: var(--glass-bg);
    border: 1px solid var(--cyan);
    color: var(--cyan);
    border-radius: 30px;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 1px;
    margin-bottom: 24px;
    box-shadow: 0 0 10px var(--cyan-glow);
}

.hero h1 {
    font-size: 4rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 24px;
    letter-spacing: -1px;
}

.text-gradient {
    background: linear-gradient(135deg, var(--cyan), var(--blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.2rem;
    color: var(--text-muted);
    margin-bottom: 40px;
    font-weight: 300;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
}

.btn-primary, .btn-secondary {
    padding: 14px 32px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.btn-primary {
    background: linear-gradient(135deg, var(--cyan), var(--blue));
    color: #fff;
    box-shadow: 0 4px 15px var(--cyan-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 242, 254, 0.6);
}

.btn-secondary {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-main);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
}

/* Sections */
.section {
    padding: 120px 30px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: 20px;
    font-weight: 700;
}

.text-center {
    text-align: center;
}

.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
}

/* About Section */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-text p {
    color: var(--text-muted);
    font-size: 1.1rem;
    line-height: 1.8;
}

.about-visual {
    height: 400px;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.abstract-oreum .circle {
    position: absolute;
    border-radius: 50%;
    border: 1px solid var(--cyan);
    opacity: 0.3;
}

.c1 { width: 300px; height: 300px; animation: float 6s infinite ease-in-out; }
.c2 { width: 400px; height: 400px; border-style: dashed; animation: float 8s infinite ease-in-out reverse; }
.c3 { width: 200px; height: 200px; background: radial-gradient(circle, var(--cyan-glow), transparent); animation: pulseGlow 4s infinite alternate; }

@keyframes float {
    0% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(180deg); }
    100% { transform: translateY(0px) rotate(360deg); }
}

/* Technology Section */
.tech-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    margin-top: 60px;
}

.tech-card {
    padding: 40px;
    transition: transform 0.3s ease;
}

.tech-card:hover {
    transform: translateY(-10px);
    border-color: var(--cyan);
}

.tech-icon {
    font-size: 3rem;
    margin-bottom: 24px;
}

.tech-card h3 {
    font-size: 1.5rem;
    margin-bottom: 16px;
    color: var(--cyan);
}

.tech-card p {
    color: var(--text-muted);
    font-size: 1.05rem;
}

/* Footer */
.footer {
    background: var(--bg-darker);
    padding: 60px 30px;
    border-top: 1px solid var(--glass-border);
}

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

.footer-logo {
    display: flex;
    align-items: center;
    gap: 15px;
    font-size: 1.2rem;
    font-weight: 600;
}

.logo-img-small {
    height: 32px;
    filter: grayscale(1) brightness(2);
}

.footer-info {
    text-align: right;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Animations */
.fade-in-up {
    animation: fadeInUp 1s ease forwards;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

.reveals {
    opacity: 0;
    transform: translateY(40px);
    transition: all 0.8s ease-out;
}

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

/* Responsive */
@media (max-width: 900px) {
    .about-grid, .tech-grid { grid-template-columns: 1fr; }
    .hero h1 { font-size: 2.8rem; }
    .nav-links a:not(.btn-outline) { display: none; }
    .footer-content { flex-direction: column; gap: 20px; text-align: center; }
    .footer-info { text-align: center; }
}