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

body {
    font-family: 'Noto Sans KR', sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #f5f5f5 0%, #e8e8e8 100%);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    color: white;
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo i {
    font-size: 2rem;
    color: #f39c12;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
}

.nav {
    display: flex;
    gap: 2rem;
}

.nav a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav a:hover {
    color: #f39c12;
}

/* Hero Section */
.hero {
    margin-top: 80px;
    padding: 4rem 0;
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    color: white;
    position: relative;
    overflow: hidden;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: start;
}

.hero-content {
    text-align: left;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.hero-content h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: #f39c12;
    position: relative;
    text-align: left;
}

.hero-content h2::after {
    display: none;
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    text-align: left;
}

.cta-button {
    display: inline-block;
    background: #f39c12;
    color: white;
    padding: 1rem 2rem;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(243, 156, 18, 0.3);
    text-align: left;
    align-self: flex-start;
}

.cta-button:hover {
    background: #e67e22;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(243, 156, 18, 0.4);
}

.chess-board {
    position: relative;
    height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.board-pattern {
    width: 250px;
    height: 250px;
    object-fit: contain;
    border-radius: 8px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
    animation: float 3s ease-in-out infinite;
}

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

/* Sections */
section {
    padding: 4rem 0;
}

section h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #2c3e50;
    position: relative;
}

section h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 160px;
    height: 4px;
    background: #f39c12;
    border-radius: 2px;
}

/* About Section */
.about {
    background: white;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.profile-info h3 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    color: #2c3e50;
}

.info-list {
    list-style: none;
}

.info-list li {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
    font-size: 1.1rem;
    padding: 0.8rem;
    background: #f8f9fa;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.info-list li:hover {
    background: #e9ecef;
    transform: translateX(5px);
}

.info-list i {
    color: #f39c12;
    font-size: 1.2rem;
    width: 24px;
    text-align: center;
    flex-shrink: 0;
}

.blog-link {
    color: #f39c12;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
}

.blog-link:hover {
    color: #e67e22;
    text-decoration: underline;
}

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

.profile-image {
    max-width: 100%;
    height: auto;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.profile-image:hover {
    transform: scale(1.05);
}

/* Certificates Section */
.certificates {
    background: #f8f9fa;
}

.cert-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.cert-item {
    background: white;
    padding: 2rem;
    text-align: center;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.cert-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
    border-color: #f39c12;
}

.cert-item i {
    font-size: 3rem;
    color: #f39c12;
    margin-bottom: 1rem;
}

.cert-item h3 {
    font-size: 1.1rem;
    color: #2c3e50;
    font-weight: 600;
}

/* Experience Section */
.experience {
    background: white;
}

.exp-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.exp-item {
    background: white;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    text-align: center;
}

.exp-link {
    display: block;
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

.exp-link:hover {
    color: inherit;
    transform: translateY(-5px);
}

.exp-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
}

.exp-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-bottom: 3px solid #f39c12;
}

.exp-item h3 {
    font-size: 1.3rem;
    color: #2c3e50;
    margin: 1rem 0;
    padding: 0 1rem;
}

.exp-item p {
    color: #666;
    padding: 0 1rem 1.5rem;
}

/* Contact Section */
.contact {
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    color: white;
}

.contact h2 {
    color: white;
}

.contact h2::after {
    background: #f39c12;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 1.5rem;
    background: rgba(255,255,255,0.1);
    border-radius: 10px;
    transition: all 0.3s ease;
    margin-bottom: 1rem;
}

.contact-item:hover {
    background: rgba(255,255,255,0.15);
    transform: translateX(5px);
}

.contact-item i {
    font-size: 2rem;
    color: #f39c12;
    width: 24px;
    text-align: center;
    flex-shrink: 0;
}

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

.contact-item a {
    color: #f39c12;
    text-decoration: none;
}

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

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

.bottom-image {
    max-width: 100%;
    height: auto;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    transition: transform 0.3s ease;
}

.bottom-image:hover {
    transform: scale(1.05);
}

.contact-form {
    background: rgba(255,255,255,0.1);
    padding: 2rem;
    border-radius: 15px;
}

.contact-form h3 {
    margin-bottom: 1.5rem;
    color: #f39c12;
}

.contact-form input,
.contact-form select,
.contact-form textarea {
    width: 100%;
    padding: 1rem;
    margin-bottom: 1rem;
    border: none;
    border-radius: 8px;
    background: rgba(255,255,255,0.9);
    font-family: 'Noto Sans KR', sans-serif;
    transition: all 0.3s ease;
}

.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
    outline: none;
    background: white;
    box-shadow: 0 0 0 3px rgba(243, 156, 18, 0.3);
}

.submit-btn {
    width: 100%;
    padding: 1rem;
    background: #f39c12;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.submit-btn:hover {
    background: #e67e22;
    transform: translateY(-2px);
}

/* Footer */
.footer {
    background: #1a252f;
    color: white;
    padding: 2rem 0;
    text-align: center;
}

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

.social-links a {
    color: white;
    font-size: 1.5rem;
    margin-left: 1rem;
    transition: color 0.3s ease;
}

.social-links a:first-child {
    margin-left: 0;
}

.social-links a:hover {
    color: #f39c12;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header .container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav {
        gap: 1rem;
        font-size: 0.9rem;
    }
    
    .hero .container,
    .about-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .exp-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }
    
    .hero-content h2 {
        font-size: 2rem;
    }
    
    .chess-board {
        height: 200px;
    }
    
    .board-pattern {
        width: 180px;
        height: 180px;
    }
    
    .cert-grid {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
        gap: 1rem;
    }
    
    .footer .container {
        flex-direction: column;
        gap: 1rem;
    }
    
    section h2 {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero {
        padding: 2rem 0;
        margin-top: 120px;
    }
    
    section {
        padding: 2rem 0;
    }
    
    .hero-content h2 {
        font-size: 1.5rem;
    }
    
    .hero-content p {
        font-size: 1rem;
    }
    
    .cert-item {
        padding: 1.5rem 1rem;
    }
    
    .contact-form {
        padding: 1.5rem;
    }
}