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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.6;
    color: #ffffff;
    background: linear-gradient(135deg, #0c0c0c 0%, #1a1a1a 100%);
    overflow-x: hidden;
    min-height: 100vh;
    padding-top: 80px;  /* 새로 추가 */
}

/* 배경 애니메이션 효과 */
.background-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    opacity: 0.1;
}

.floating-shapes {
    position: absolute;
    width: 100px;
    height: 100px;
    background: linear-gradient(45deg, #ff6b6b, #4ecdc4);
    border-radius: 50%;
    animation: float 20s infinite ease-in-out;
}

.floating-shapes:nth-child(2) {
    top: 20%;
    left: 20%;
    animation-delay: -5s;
    background: linear-gradient(45deg, #a8edea, #fed6e3);
}

.floating-shapes:nth-child(3) {
    top: 60%;
    right: 20%;
    animation-delay: -10s;
    background: linear-gradient(45deg, #667eea, #764ba2);
}

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    33% { transform: translateY(-30px) rotate(120deg); }
    66% { transform: translateY(30px) rotate(240deg); }
}

/* 네비게이션 */
nav {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(20px);
    z-index: 1000;
    padding: 1rem 2rem;
    transition: all 0.3s ease;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    background: linear-gradient(45deg, #ff6b6b, #4ecdc4);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    color: #ffffff;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(45deg, #ff6b6b, #4ecdc4);
    transition: width 0.3s ease;
}

.nav-links a:hover::after {
    width: 100%;
}

/* 히어로 섹션 */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
}

.hero-content {
    max-width: 800px;
    z-index: 2;
}

.hero h1 {
    font-size: 4rem;
    font-weight: 800;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, #667eea, #764ba2, #ff6b6b, #4ecdc4);
    background-size: 400% 400%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradient 8s ease infinite;
}

@keyframes gradient {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.hero p {
    font-size: 1.3rem;
    color: #b3b3b3;
    margin-bottom: 2rem;
}

.cta-button {
    display: inline-block;
    padding: 12px 30px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.4);
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 20px 40px rgba(102, 126, 234, 0.6);
}

/* 섹션 공통 스타일 */
.section {
    padding: 80px 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 3rem;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 4px;
    background: linear-gradient(45deg, #ff6b6b, #4ecdc4);
    border-radius: 2px;
}

/* About 섹션 */
.about-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 4rem;
    align-items: center;
}

.profile-image {
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea, #764ba2);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    margin: 0 auto;
    box-shadow: 0 20px 60px rgba(102, 126, 234, 0.3);
    transition: transform 0.3s ease;
}

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

.about-text h3 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    color: #4ecdc4;
}

.about-text p {
    color: #b3b3b3;
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

/* Experience 섹션 */
.experience-timeline {
    position: relative;
    max-width: 1200px;
    margin: 0 auto;
}

.experience-timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 100%;
    background: linear-gradient(to bottom, #667eea, #764ba2);
    border-radius: 2px;
}

.experience-item {
    margin-bottom: 3rem;
    position: relative;
}

.experience-item:nth-child(odd) .experience-content {
    margin-left: 0;
    margin-right: 50%;
    padding-right: 2rem;
    text-align: right;
}

.experience-item:nth-child(even) .experience-content {
    margin-left: 50%;
    margin-right: 0;
    padding-left: 2rem;
    text-align: left;
}

.experience-content {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 2rem;
    position: relative;
    transition: all 0.3s ease;
}

.experience-content:hover {
    transform: translateY(-5px);
    background: rgba(255, 255, 255, 0.1);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
}

.experience-dot {
    position: absolute;
    left: 50%;
    top: 2rem;
    transform: translateX(-50%);
    width: 20px;
    height: 20px;
    background: linear-gradient(45deg, #667eea, #764ba2);
    border-radius: 50%;
    border: 4px solid #1a1a1a;
    z-index: 10;
}

.experience-period {
    background: linear-gradient(45deg, #ff6b6b, #4ecdc4);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.experience-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: #ffffff;
}

.experience-company {
    color: #4ecdc4;
    font-weight: 600;
    margin-bottom: 1rem;
}

.experience-description {
    color: #b3b3b3;
    line-height: 1.6;
    margin-bottom: 1rem;
}

.experience-skills {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.experience-item:nth-child(odd) .experience-skills {
    justify-content: flex-end;
}

.experience-item:nth-child(even) .experience-skills {
    justify-content: flex-start;
}

.experience-skill {
    background: rgba(102, 126, 234, 0.2);
    color: #667eea;
    padding: 4px 10px;
    border-radius: 15px;
    font-size: 0.75rem;
    font-weight: 500;
}

/* 스킬 섹션 */
.skills-container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 3rem;
}

.skill-category {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 20px;
    padding: 2rem;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.skill-category h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    text-align: center;
    color: #4ecdc4;
}

.skill-list {
    display: grid;
    gap: 1rem;
}

.skill-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    flex-direction: column;  /* 추가 */
    gap: 0.5rem;            /* 추가 */
}

.skill-item:last-child {
    border-bottom: none;
}

.skill-name {
    font-weight: 600;
    color: #ffffff;
}

.skill-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.skill-percentage {
    font-size: 0.9rem;
    color: #4ecdc4;
    font-weight: 600;
}

.skill-progress {
    width: 100%;
    height: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    overflow: hidden;
}

.skill-progress-bar {
    height: 100%;
    background: linear-gradient(45deg, #ff6b6b, #4ecdc4);
    border-radius: 4px;
    width: 0%;
    transition: width 1.5s ease-in-out;
}

/* 프로젝트 섹션 */
.projects-grid {
    display: grid;
    /* grid-template-columns: repeat(auto-fit, minmax(350px, 1fr)); */
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    /* gap: 3rem; */
}

.project-card {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 20px;
    overflow: hidden;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.project-image {
    height: 200px;
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: white;
    position: relative;
}

.project-image::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.3);
    z-index: 1;
}

.project-content {
    padding: 2rem;
}

.project-content h4 {
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.project-content p {
    color: #b3b3b3;
    margin-bottom: 1.5rem;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.tag {
    background: rgba(255, 107, 107, 0.2);
    color: #ff6b6b;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
}

.project-links {
    display: flex;
    gap: 1rem;
}

.project-link {
    color: #4ecdc4;
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.project-link:hover {
    color: #ff6b6b;
}

/* 연락처 섹션 */
.contact {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
    border-radius: 30px;
    padding: 80px 2rem;      /* 추가: 내부 패딩 */
    max-width: 1200px;       /* 추가: 최대 너비 */
    margin: 2rem auto;       /* 변경: auto로 중앙정렬 */
}

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

.contact-content p {
    text-align: center;
    margin-bottom: 2rem;  /* 여백 추가 */
}

.contact-info {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.contact-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.contact-icon {
    font-size: 2rem;
    color: #4ecdc4;
}

.contact-item span {
    color: #b3b3b3;
}

/* 푸터 */
footer {
    text-align: center;
    padding: 2rem;
    background: rgba(0, 0, 0, 0.5);
    color: #666;
}

/* 모달 관련 스타일 */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    animation: fadeIn 0.3s ease;
}

.modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: rgba(26, 26, 26, 0.95);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    margin: 5% auto;
    padding: 2rem;
    border-radius: 20px;
    width: 90%;
    max-width: 800px;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
    animation: slideIn 0.3s ease;
    color: #ffffff;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideIn {
    from { transform: scale(0.8) translateY(-50px); opacity: 0; }
    to { transform: scale(1) translateY(0); opacity: 1; }
}

.close {
    position: absolute;
    right: 1rem;
    top: 1rem;
    color: #b3b3b3;
    font-size: 2rem;
    font-weight: bold;
    cursor: pointer;
    transition: color 0.3s ease;
}

.close:hover {
    color: #4ecdc4;
}

.modal h3 {
    color: #4ecdc4;
    margin-bottom: 1.5rem;
    font-size: 1.8rem;
    font-weight: 700;
}

.modal h4 {
    color: #ffffff;
    margin: 1.5rem 0 1rem 0;
    font-size: 1.3rem;
    font-weight: 600;
}

.modal p, .modal li {
    line-height: 1.8;
    margin-bottom: 1rem;
    color: #b3b3b3;
}

.modal ul {
    margin-left: 1.5rem;
    margin-bottom: 1rem;
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin: 1rem 0;
}

.tech-item {
    background: linear-gradient(45deg, #667eea, #764ba2);
    color: white;
    padding: 0.4rem 0.8rem;
    border-radius: 15px;
    font-size: 0.9rem;
    font-weight: 500;
}

.achievement-list {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 1.5rem;
    border-radius: 15px;
    margin: 1rem 0;
    backdrop-filter: blur(10px);
}

.achievement-list ul {
    margin: 0;
    padding-left: 1rem;
}

.achievement-list li {
    margin-bottom: 0.8rem;
}

.achievement-list li strong {
    color: #4ecdc4;
}

/* 반응형 */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .about-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .nav-links {
        display: none;
    }
    .contact {
        padding: 60px 1rem;
        margin: 2rem 1rem;
    }
    .contact-info {
        flex-direction: column;
        gap: 1.5rem;
    }
    
    .section {
        padding: 60px 1rem;
    }

    .skills-container {
        grid-template-columns: 1fr;
    }

    .experience-timeline::before {
        display: none;
    }
    
    .experience-item:nth-child(odd) .experience-content,
    .experience-item:nth-child(even) .experience-content {
        margin: 0;
        padding: 2rem;
        text-align: left;
    }
    
    .experience-dot {
        left: 1rem;
    }
    
    .experience-item:nth-child(odd) .experience-skills,
    .experience-item:nth-child(even) .experience-skills {
        justify-content: flex-start;
    }

    .modal-content {
        margin: 2%;
        padding: 1.5rem;
        width: 95%;
    }
    
    .modal h3 {
        font-size: 1.5rem;
    }
    
    .modal h4 {
        font-size: 1.2rem;
    }
}