:root {
    --color-primary: #00ff88;
    --color-secondary: #00d4ff;
    --color-accent: #ff006e;
    --color-dark: #0a0a0f;
    --color-dark-light: #13131a;
    --color-dark-card: #1a1a24;
    --color-gray: #9ca3af;
    --color-white: #ffffff;
    --spacing: 2rem;
    --radius: 16px;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Segoe UI', system-ui, sans-serif;
    background: var(--color-dark);
    color: var(--color-white);
    line-height: 1.6;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image: 
        linear-gradient(rgba(0, 255, 136, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 255, 136, 0.02) 1px, transparent 1px);
    background-size: 50px 50px;
    pointer-events: none;
    z-index: 0;
}

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(10, 10, 15, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 255, 136, 0.1);
    z-index: 1000;
    padding: 1rem 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--color-primary);
    text-shadow: 0 0 20px rgba(0, 255, 136, 0.5);
}

.nav-menu {
    display: flex;
    gap: 0.5rem;
    list-style: none;
}

.nav-menu a {
    color: var(--color-gray);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    transition: all 0.3s;
    font-size: 0.9rem;
}

.nav-menu a:hover {
    color: var(--color-primary);
    background: rgba(0, 255, 136, 0.1);
}

.nav-menu a.active {
    color: var(--color-primary);
    background: rgba(0, 255, 136, 0.15);
    box-shadow: 0 0 20px rgba(0, 255, 136, 0.3);
    font-weight: 700;
}

.fullscreen-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 5rem 2rem 2rem;
    position: relative;
}

.section-alt {
    background: var(--color-dark-light);
}

.section-content {
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
}

.section-title {
    font-size: clamp(2rem, 5vw, 3rem);
    text-align: center;
    margin-bottom: 3rem;
    color: var(--color-white);
    font-weight: 900;
}

.section-title::after {
    content: '';
    display: block;
    width: 80px;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    margin: 1rem auto 0;
    box-shadow: 0 0 20px rgba(0, 255, 136, 0.5);
}

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

.hero-background {
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 50% 50%, 
        rgba(0, 255, 136, 0.1) 0%, 
        transparent 50%);
    pointer-events: none;
}

.badge {
    display: inline-block;
    padding: 0.5rem 1.5rem;
    background: rgba(0, 255, 136, 0.1);
    border: 1px solid rgba(0, 255, 136, 0.3);
    border-radius: 50px;
    color: var(--color-primary);
    font-size: 0.9rem;
    margin-bottom: 2rem;
}

.main-title {
    font-size: clamp(2rem, 8vw, 5rem);
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: 1.5rem;
}

.title-small {
    display: block;
    font-size: 0.4em;
    font-weight: 600;
    color: var(--color-gray);
}

.title-large {
    display: block;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    font-size: clamp(1rem, 3vw, 1.25rem);
    color: var(--color-gray);
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: 1rem 2rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    display: inline-block;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: var(--color-dark);
}

.btn-primary:hover {
    box-shadow: 0 0 30px rgba(0, 255, 136, 0.5);
    transform: translateY(-2px);
}

.btn-secondary {
    background: rgba(0, 255, 136, 0.1);
    border: 1px solid var(--color-primary);
    color: var(--color-primary);
}

.btn-secondary:hover {
    background: var(--color-primary);
    color: var(--color-dark);
}

.scroll-hint {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    color: var(--color-gray);
    font-size: 0.9rem;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(-10px); }
}

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

.three-columns {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.edu-card, .exp-card, .skill-category, .soft-card, .hobby-card, .contact-card {
    background: rgba(26, 26, 36, 0.6);
    backdrop-filter: blur(10px);
    padding: 2rem;
    border-radius: var(--radius);
    border: 1px solid rgba(0, 255, 136, 0.1);
    transition: all 0.3s;
}

.edu-card:hover, .exp-card:hover, .skill-category:hover, 
.soft-card:hover, .hobby-card:hover, .contact-card:hover {
    border-color: var(--color-primary);
    box-shadow: 0 0 30px rgba(0, 255, 136, 0.3);
    transform: translateY(-5px);
}

.edu-year {
    color: var(--color-primary);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.edu-card h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.edu-school {
    color: var(--color-gray);
    margin-bottom: 1rem;
}

.edu-description {
    color: var(--color-primary);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.edu-detail {
    color: var(--color-gray);
    font-size: 0.9rem;
}

.edu-courses {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1rem;
}

.course-tag {
    padding: 0.4rem 1rem;
    background: rgba(0, 255, 136, 0.1);
    border: 1px solid rgba(0, 255, 136, 0.2);
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--color-gray);
}

.experience-container {
    max-width: 800px;
    margin: 0 auto;
}

.exp-card h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.exp-date {
    color: var(--color-primary);
    font-weight: 600;
}

.exp-description {
    color: var(--color-gray);
    margin: 1rem 0;
}

.category-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.skill-category h3 {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
}

.skill-items {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.skill-item span {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--color-gray);
    font-size: 0.9rem;
}

.skill-bar {
    height: 8px;
    background: rgba(0, 255, 136, 0.1);
    border-radius: 10px;
    overflow: hidden;
}

.skill-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    border-radius: 10px;
    transition: width 1s ease;
}

.soft-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

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

.soft-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.soft-card h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.soft-card p {
    color: var(--color-gray);
    font-size: 0.9rem;
}

.hobbies-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

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

.hobby-icon {
    font-size: 3.5rem;
    margin-bottom: 1rem;
}

.hobby-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.hobby-card p {
    color: var(--color-gray);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

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

.contact-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.contact-card h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.contact-card a {
    color: var(--color-primary);
    text-decoration: none;
    font-size: 0.9rem;
}

.contact-card a:hover {
    text-decoration: underline;
}

.footer-info {
    text-align: center;
    color: var(--color-gray);
    font-size: 0.85rem;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid rgba(0, 255, 136, 0.1);
}

.footer-info p {
    margin: 0.25rem 0;
}

@media (max-width: 768px) {
    .nav-menu {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .nav-menu a {
        font-size: 0.8rem;
        padding: 0.4rem 0.8rem;
    }
    
    .fullscreen-section {
        padding: 4rem 1rem 1rem;
    }
    
    .section-title {
        margin-bottom: 2rem;
    }
    
    .two-columns, .three-columns {
        grid-template-columns: 1fr;
    }
    
    .edu-courses {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .logo {
        font-size: 1.2rem;
    }
    
    .nav-menu a {
        font-size: 0.75rem;
        padding: 0.3rem 0.6rem;
    }
    
    .badge {
        font-size: 0.8rem;
        padding: 0.4rem 1rem;
    }
    
    .btn {
        padding: 0.8rem 1.5rem;
        font-size: 0.9rem;
    }
}