@import url('https://fonts.googleapis.com/css2?family=Sora:wght@300;400;500;600;700&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@700&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@700&display=swap');

:root {
    /* Color System */
    --primary-color: #0A84FF;      /* iOS Blue */
    --secondary-color: #5E5CE6;    /* iOS Purple */
    --background-color: #111111;   /* 약간 밝은 검정 */
    --surface-color: #1C1C1E;      /* iOS Dark Gray */
    --card-color: #2C2C2E;         /* iOS Card Background */
    --text-color: #FFFFFF;
    --text-secondary: #AEAEB2;     /* 더 밝은 회색 */
    --success-color: #30D158;      /* iOS Green */
    --error-color: #FF453A;        /* iOS Red */
    
    /* Typography */
    --font-size-xs: 0.75rem;    /* 12px */
    --font-size-sm: 0.875rem;   /* 14px */
    --font-size-base: 1rem;     /* 16px */
    --font-size-lg: 1.125rem;   /* 18px */
    --font-size-xl: 1.25rem;    /* 20px */
    --font-size-2xl: 1.5rem;    /* 24px */
    --font-size-3xl: 2rem;      /* 32px */
    --font-size-4xl: 2.5rem;    /* 40px */
    --font-size-5xl: 3rem;      /* 48px */
    
    /* Spacing */
    --space-1: 0.25rem;   /* 4px */
    --space-2: 0.5rem;    /* 8px */
    --space-3: 0.75rem;   /* 12px */
    --space-4: 1rem;      /* 16px */
    --space-5: 1.5rem;    /* 24px */
    --space-6: 2rem;      /* 32px */
    --space-7: 2.5rem;    /* 40px */
    --space-8: 3rem;      /* 48px */
    --space-9: 4rem;      /* 64px */
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    
    /* Container */
    --container-width: 1200px;
    --section-spacing: 5rem;
}

/* Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent !important;
}

*:focus {
    outline: none !important;
}

body {
    font-family: 'Sora', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
    background-image: 
        radial-gradient(circle at 15% 50%, rgba(10, 132, 255, 0.08) 0%, transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(94, 92, 230, 0.08) 0%, transparent 25%);
}

/* Layout */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 var(--space-5);
}

section {
    padding: var(--section-spacing) 0;
}

/* Section Headers */
.section-header {
    text-align: center;
    margin-bottom: var(--space-7);
}

.section-subtitle {
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--primary-color);
    margin-bottom: var(--space-2);
}

.section-title {
    font-size: var(--font-size-4xl);
    color: var(--text-color);
}

/* Cards & Items */
.card-base {
    background: rgba(44, 44, 46, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-lg);
    transition: all 0.3s ease;
    backdrop-filter: blur(12px);
}

.card-base:hover {
    transform: translateY(-4px);
    border-color: var(--primary-color);
    background: rgba(44, 44, 46, 0.6);
}

/* Grid Layouts */
.grid-base {
    display: grid;
    gap: var(--space-4);
}

/* Buttons */
.button-base {
    padding: var(--space-4) var(--space-6);
    border-radius: var(--radius-md);
    font-weight: 500;
    transition: all 0.3s ease;
    cursor: pointer;
}

.button-primary {
    background: var(--primary-color);
    color: var(--text-color);
}

.button-secondary {
    background: transparent;
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
}

/* Icons */
.icon-base {
    color: var(--primary-color);
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Responsive Design */
@media (max-width: 1200px) {
    :root {
        --container-width: 90%;
    }
}

@media (max-width: 768px) {
    :root {
        --section-spacing: 4rem;
        --font-size-4xl: 2rem;
        --font-size-3xl: 1.75rem;
    }
}

@media (max-width: 480px) {
    :root {
        --section-spacing: 3rem;
    }
}

/* Intro Section 스타일 수정 */
.intro-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: calc(var(--section-spacing) + 80px) 0 var(--section-spacing);
    position: relative;
}

.intro-content {
    display: grid;
    grid-template-columns: 400px minmax(0, 1fr);
    gap: var(--space-8);
    align-items: center;
    margin: 0 auto;
    max-width: 1100px;
    width: 100%;
}

.intro-profile {
    position: relative;
}

.profile-image {
    width: 400px;
    height: 400px;
    border-radius: var(--radius-xl);
    overflow: hidden;
    position: relative;
}

.profile-image::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(
        to bottom,
        transparent 0%,
        rgba(0, 0, 0, 0.2) 100%
    );
    border-radius: var(--radius-lg);
}

.profile-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.intro-text {
    display: flex;
    flex-direction: column;
    justify-content: center;
    height: 100%;
}

.intro-title {
    margin-bottom: var(--space-5);
}

.intro-title h1 {
    font-size: var(--font-size-5xl);
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: var(--space-3);
    line-height: 1.1;
}

.intro-title .gradient-text {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

/* 일본어 설정일 때 특별히 적용 */
html[lang="ja"] .intro-title h1 {
    font-size: clamp(1rem, 3vw, 2.5rem);
}

html[lang="ja"] .intro-title .gradient-text {
    font-size: clamp(0.9rem, 2.2vw, 1.8rem);
}

/* 영어 모드일 때 */
html[lang="en"] .intro-title h1 {
    font-size: clamp(1.3rem, 4.8vw, 2.2rem);
    letter-spacing: -0.04em;
    word-spacing: -0.06em;
    transform: scale(0.98);
}

html[lang="en"] .intro-title .gradient-text {
    font-size: clamp(1.1rem, 4.2vw, 1.8rem);
    letter-spacing: -0.03em;
    word-spacing: -0.04em;
    transform: scale(0.98);
}

.intro-description {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--space-5);
    width: 100%;
}

.intro-description + .intro-description {
    margin-top: 0;
    margin-bottom: var(--space-5);
}

.intro-links {
    display: flex;
    gap: var(--space-4);
}

.contact-link, .github-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.9rem 1.8rem;
    border-radius: var(--radius-md);
    font-weight: 500;
    transition: all 0.3s ease;
}

.contact-link {
    background: var(--primary-color);
    color: var(--text-color);
}

.github-link {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-color);
}

.contact-link:hover, .github-link:hover {
    transform: translateY(-2px);
}

/* 반응형 디자인 수정 */
@media (max-width: 1024px) {
    .intro-content {
        grid-template-columns: 300px minmax(0, 1fr);
        gap: var(--space-6);
    }

    .profile-image {
        width: 300px;
        height: 300px;
    }

    .intro-title h1 {
        font-size: 3rem;
    }

    .intro-title .gradient-text {
        font-size: 2.2rem;
    }
}

/* 모바일 대응을 위한 미디어 쿼리 수정 */
@media (max-width: 768px) {
    .intro-section {
        padding-top: 100px;
        min-height: auto;
    }

    .intro-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--space-6);
    }

    .profile-image {
        width: 260px;
        height: 260px;
        margin: 0 auto;
    }

    .intro-text {
        margin: 0 auto;
    }

    .intro-title h1,
    .intro-title .gradient-text {
        transform-origin: center;
        text-align: center;
    }

    .intro-title h1 {
        font-size: clamp(1.6rem, 5.5vw, 2.6rem);
    }

    .intro-title .gradient-text {
        font-size: clamp(1.4rem, 5vw, 2.2rem);
    }

    .intro-description {
        font-size: var(--font-size-base);
        margin: var(--space-4) auto var(--space-6);
    }

    .intro-links {
        justify-content: center;
        gap: var(--space-3);
    }

    .contact-link, .github-link {
        justify-content: center;
        padding: 0.8rem 1.5rem;
        min-width: 140px;
    }

    /* 모바일에서 일본어 설정일 때 */
    html[lang="ja"] .intro-title h1 {
        font-size: clamp(1.4rem, 5vw, 2.4rem);
    }

    html[lang="ja"] .intro-title .gradient-text {
        font-size: clamp(1.2rem, 4.5vw, 2rem);
    }

    /* 모바일에서 영어 모드일 때 */
    html[lang="en"] .intro-title h1 {
        font-size: clamp(1.3rem, 4.8vw, 2.2rem);
        letter-spacing: -0.04em;
        word-spacing: -0.06em;
        transform: scale(0.98);
    }

    html[lang="en"] .intro-title .gradient-text {
        font-size: clamp(1.1rem, 4.2vw, 1.8rem);
        letter-spacing: -0.03em;
        word-spacing: -0.04em;
        transform: scale(0.98);
    }
}

/* 더 작은 화면에서의 추가 조정 */
@media (max-width: 480px) {
    .intro-links {
        flex-direction: column;
    }

    .contact-link, .github-link {
        width: 100%;
    }

    .intro-title h1 {
        font-size: clamp(1.2rem, 4.5vw, 2rem);
    }

    .intro-title .gradient-text {
        font-size: clamp(1rem, 4vw, 1.6rem);
    }

    /* 더 작은 화면에서 일본어 설정일 때 */
    html[lang="ja"] .intro-title h1 {
        font-size: clamp(1.3rem, 5.5vw, 2.2rem);
    }

    html[lang="ja"] .intro-title .gradient-text {
        font-size: clamp(1.1rem, 5vw, 1.8rem);
    }

    /* 더 작은 화면에서 영어 모드일 때 */
    html[lang="en"] .intro-title h1 {
        font-size: clamp(1.2rem, 4.5vw, 2rem);
        letter-spacing: -0.04em;
        word-spacing: -0.06em;
        transform: scale(0.96);
    }

    html[lang="en"] .intro-title .gradient-text {
        font-size: clamp(1rem, 4vw, 1.6rem);
        letter-spacing: -0.03em;
        word-spacing: -0.04em;
        transform: scale(0.96);
    }
}

/* Header & Navigation */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 80px;
    background: rgba(17, 17, 17, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    z-index: 1000;
}

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

.mobile-menu-btn {
    display: none;
    background: transparent;
    border: none;
    color: var(--text-color);
    font-size: 1.5rem;
    cursor: pointer;
    padding: var(--space-2);
    z-index: 1000;
    transition: all 0.3s ease;
}

.mobile-menu-btn:hover {
    color: var(--primary-color);
}

/* Contact Links */
.contact-link, .github-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.8rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 500;
    transition: all 0.3s ease;
    text-decoration: none;
}

.contact-link {
    background: var(--primary-color);
    color: var(--text-color);
}

.github-link {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--text-color);
}

.contact-link:hover, .github-link:hover {
    transform: translateY(-2px);
}

/* Experience Section */
.timeline {
    max-width: 1100px;
    margin: 0 auto;
    width: 100%;
}

.timeline-item {
    margin-bottom: var(--space-8);
    padding: var(--space-8);
    background: rgba(44, 44, 46, 0.5);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(12px);
    transition: all 0.3s ease;
}

.timeline-item:hover {
    transform: translateY(-2px);
    border-color: rgba(10, 132, 255, 0.3);
    background: rgba(44, 44, 46, 0.6);
}

.timeline-date {
    color: var(--primary-color);
    font-weight: 500;
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-3);
}

.timeline-content h3 {
    font-size: var(--font-size-2xl);
    color: var(--text-color);
    margin-bottom: var(--space-4);
    letter-spacing: -0.02em;
    line-height: 1.3;
    font-weight: 600;
}

.company-header {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-6);
}

.company-header h4 {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin: 0;
}

.company-description {
    margin-bottom: var(--space-6);
}

.company-description p {
    color: var(--text-secondary);
    font-size: var(--font-size-base);
    line-height: 1.6;
    margin: 0;
}

.timeline-item-description {
    color: var(--text-secondary);
    margin-bottom: var(--space-5);
    line-height: 1.7;
}

.timeline-item-description strong {
    display: block;
    margin-bottom: var(--space-5);
    color: var(--text-color);
    font-size: var(--font-size-base);
    line-height: 1.4;
}

.timeline-item-description p {
    margin-bottom: var(--space-5);
    font-size: var(--font-size-base);
    line-height: 1.7;
}

/* 마지막 항목은 마진 제거 */
.timeline-item-description p:last-child {
    margin-bottom: 0;
}

/* 모바일에서도 동일한 간격 유지 */
@media (max-width: 768px) {
    .timeline-item-description strong {
        margin-bottom: var(--space-5);
    }
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    margin-top: var(--space-6);
}

/* Projects 섹션과 동일한 태그 스타일 적용 */
.tech-tags span {
    font-size: var(--font-size-sm);
    padding: var(--space-2) var(--space-4);
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
    color: var(--text-color);
    transition: all 0.3s ease;
}

.tech-tags span:hover {
    background: rgba(10, 132, 255, 0.2);
    transform: translateY(-1px);
}

/* 앱스토어, 플레이스토어 링크 스타일 */
.company-header a {
    color: var(--text-secondary);
    font-size: 1.2rem;
    text-decoration: none;
    display: flex;
    align-items: center;
}

/* 모바일 대응 */
@media (max-width: 768px) {
    .timeline-item {
        padding: var(--space-6);
        margin-bottom: var(--space-7);
    }
    
    .timeline-content h3 {
        margin-bottom: var(--space-4);
        font-size: var(--font-size-xl);
    }
    
    .company-header {
        margin-bottom: var(--space-5);
        gap: var(--space-2);
    }
    
    .company-description {
        margin-bottom: var(--space-5);
    }
    
    .company-description p {
        font-size: var(--font-size-sm);
        line-height: 1.5;
    }
    
    .timeline-item-description {
        margin-bottom: var(--space-5);
    }
    
    .tech-tags {
        margin-top: var(--space-5);
        gap: var(--space-2);
    }
}

/* 더 작은 화면에서도 패딩 유지 */
@media (max-width: 480px) {
    .timeline-item {
        padding: var(--space-5);
        margin-bottom: var(--space-6);
    }
    
    .timeline-content h3 {
        font-size: var(--font-size-lg);
    }
    
    .company-header h4 {
        font-size: var(--font-size-base);
    }
    
    .timeline-item-description p {
        font-size: var(--font-size-sm);
        line-height: 1.6;
    }
}

/* Projects Section */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--space-5);
}

.project-card {
    background: rgba(44, 44, 46, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    transition: all 0.3s ease;
    backdrop-filter: blur(12px);
}

.project-card p {
    color: var(--text-secondary);
    margin-bottom: var(--space-4);
    font-size: var(--font-size-base);
    line-height: 1.6;
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--space-5);
}

.project-title {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.project-title h3 {
    font-size: var(--font-size-xl);
    color: var(--text-color);
    margin: 0;
    line-height: 1;
}

.project-links {
    display: flex;
    gap: var(--space-3);
    height: 24px;
    transform: translateY(-2px);
}

.project-period {
    font-size: var(--font-size-sm);
    color: var(--primary-color);
    font-weight: 500;
    margin-top: 0.25rem;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-top: var(--space-4);
}

.project-tags span {
    font-size: var(--font-size-sm);
    padding: 0.3rem 0.8rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
}

.project-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 1.2rem;
    transition: color 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    padding: 0;
}

.project-links a:hover {
    color: var(--primary-color);
}

/* Contact Section */
.contact-content {
    max-width: 500px;
    margin: 0 auto;
    text-align: center;
}

.contact-description {
    font-size: var(--font-size-xl);
    color: var(--text-secondary);
    margin-bottom: var(--space-6);
}

.contact-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-4);
}

.contact-method {
    background: rgba(44, 44, 46, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-lg);
    padding: var(--space-4);
    display: flex;
    align-items: center;
    gap: var(--space-3);
    transition: all 0.3s ease;
    color: var(--text-color);
    text-decoration: none;
    backdrop-filter: blur(12px);
}

.contact-method:hover {
    transform: translateY(-3px);
    border-color: var(--primary-color);
    background: rgba(44, 44, 46, 0.6);
}

/* Language Selector */
.language-selector {
    display: flex;
    gap: var(--space-2);
}

.lang-btn {
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--text-color);
    padding: 0.4rem 0.8rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.3s ease;
}

.lang-btn.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

/* Mobile Menu */
@media (max-width: 768px) {
    .header {
        height: 60px;
        padding: 0;
    }

    .header .container {
        padding: 0 1rem;
        position: relative;
    }

    .logo {
        font-size: 1.5rem;
        font-weight: 600;
    }

    .language-selector {
        margin-left: auto;
        margin-right: 3.5rem;
    }

    .mobile-menu-btn {
        display: block;
        position: absolute;
        right: 1rem;
        background: transparent;
        border: none;
        color: var(--text-color);
        font-size: 1.5rem;
        padding: 0.5rem;
        cursor: pointer;
        z-index: 1001;
    }

    .nav {
        display: none;
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        background: rgba(17, 17, 17, 0.98);
        backdrop-filter: blur(12px);
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        z-index: 999;
        opacity: 0;
        transform: translateY(-10px);
        transition: opacity 0.3s ease;
    }

    .nav.active {
        display: block;
        opacity: 1;
    }

    .nav ul {
        flex-direction: column;
        padding: 0;
        margin: 0;
        width: 100%;
        text-align: center;
    }

    .nav-link {
        display: block;
        padding: 1rem;
        color: var(--text-color);
        opacity: 0.8;
        transition: opacity 0.3s ease;
        text-decoration: none;
        border: none;
        margin: 0;
    }

    .nav-link:hover, .nav-link:active {
        background: rgba(255, 255, 255, 0.1);
        color: var(--primary-color);
        opacity: 1;
    }

    /* 구분선 제거 */
    .nav ul li:not(:last-child) {
        border-bottom: none;
    }

    /* 언어 선택 버튼 크기 조정 */
    .lang-btn {
        padding: 0.3rem 0.6rem;
        font-size: 0.9rem;
    }
}

/* 더 작은 화면에서의 조 */
@media (max-width: 480px) {
    .header .container {
        padding: var(--space-3) var(--space-3);
    }

    .mobile-menu-btn {
        right: var(--space-3);
    }

    .language-selector {
        right: calc(var(--space-3) + 40px);
    }

    .lang-btn {
        padding: 0.2rem 0.5rem;
        font-size: 0.8rem;
    }
}

/* Navigation Styles */
.nav {
    flex: 1;
    display: flex;
    justify-content: center;
}

.nav ul {
    display: flex;
    gap: var(--space-6);
    list-style: none;
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: var(--font-size-base);
    transition: all 0.3s ease;
    padding: var(--space-2) 0;
    position: relative;
    opacity: 0.9;
    transition: opacity 0.3s ease;
}

.nav-link::after {
    display: none;
}

.nav-link:hover {
    color: var(--text-color);
    opacity: 1;
}

/* Skills Section */
.skills-container {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.skills-category {
    background: rgba(44, 44, 46, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    backdrop-filter: blur(12px);
}

.skills-category h3 {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: var(--font-size-lg);
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.skills-category h3 i {
    font-size: var(--font-size-lg);
}

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

.skill-item {
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    padding: 0.75rem 1rem;
    transition: all 0.3s ease;
    width: 100%;
}

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

.skill-name {
    color: var(--text-color);
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.skill-level {
    display: flex;
    gap: 4px;
    color: var(--primary-color);
    font-size: 0.8rem;
}

.skill-level i {
    opacity: 0.8;
    transition: all 0.3s ease;
}

.skill-item:hover .skill-level i {
    opacity: 1;
    transform: scale(1.1);
}

.level-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
    transition: width 0.5s ease;
}

.skill-item:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-2px);
}

.skill-item:hover .level-bar {
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0% { opacity: 1; }
    50% { opacity: 0.7; }
    100% { opacity: 1; }
}

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

.background-card {
    background: rgba(44, 44, 46, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-lg);
    padding: 2rem;
    backdrop-filter: blur(12px);
    transition: transform 0.3s ease;
}

.background-card:hover {
    transform: translateY(-5px);
}

.category-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.category-header i {
    font-size: var(--font-size-xl);
    color: var(--primary-color);
}

.category-header h3 {
    font-size: var(--font-size-xl);
    color: var(--text-color);
    margin: 0;
}

.background-items {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.background-item {
    position: relative;
    padding-left: 1.25rem;
}

.background-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--primary-color);
    border-radius: 1px;
}

.background-item h4 {
    font-size: var(--font-size-lg);
    color: var(--text-color);
    margin: 0 0 0.5rem 0;
}

.background-item .item-detail {
    font-size: var(--font-size-base);
    color: var(--text-secondary);
    margin: 0 0 0.5rem 0;
}

.background-item .item-period {
    font-size: var(--font-size-sm);
    color: var(--primary-color);
}

@media (max-width: 768px) {
    .background-grid {
        grid-template-columns: 1fr;
    }
    
    .skills-category {
        padding: 1.5rem;
    }
    
    .skills-grid {
        gap: 0.75rem;
    }
    
    .skill-item {
        padding: 0.5rem 1rem;
    }
}

/* Animation */
@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    font-family: 'Outfit', sans-serif;
    font-size: 1.8rem;
    font-weight: 700;
    letter-spacing: -0.03em;
}

.logo-text {
    color: var(--text-color);
    transition: all 0.3s ease;
}

.logo-text:first-child {
    color: var(--primary-color);
    margin-right: 1px;
}

.logo-dot {
    color: var(--secondary-color);
    margin: 0 2px;
    transition: all 0.3s ease;
}

.logo:hover .logo-text:first-child {
    transform: translateX(-2px);
}

.logo:hover .logo-dot {
    color: var(--primary-color);
    transform: scale(1.2);
}

.logo:hover .logo-text:last-child {
    color: var(--secondary-color);
}

@media (max-width: 768px) {
    .logo {
        font-size: 1.5rem;
    }
}

/* Mobile Navigation */
@media (max-width: 768px) {
    .logo {
        font-size: 1.5rem;  /* 모바일에서는 기존 크기 지 */
    }

    .nav {
        display: none;
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        background: rgba(17, 17, 17, 0.98);
        backdrop-filter: blur(12px);
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        z-index: 999;
        opacity: 0;
        transition: opacity 0.3s ease;
    }

    .nav.active {
        display: block;
        opacity: 1;
    }

    .nav ul {
        flex-direction: column;
        padding: 0;  /* 전체 ul의 패딩 제거 */
        margin: 0;
        width: 100%;
        text-align: center;
    }

    .nav ul li {
        margin: 0;  /* li의 마진 제 */
    }

    .nav-link {
        display: block;
        width: 100%;  /* 전체 너비 사용 */
        padding: 1rem 2rem;  /* 링크 내부의 패딩만 유지 */
        color: var(--text-color);
        opacity: 0.8;
        transition: opacity 0.3s ease, background-color 0.3s ease;
        text-decoration: none;
    }

    .nav-link:hover, .nav-link:active {
        background: rgba(255, 255, 255, 0.1);
        color: var(--primary-color);
        opacity: 1;
    }
}

/* 복사 알림 스타일 */
.copy-notification {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary-color);
    color: var(--text-color);
    padding: 1rem 2rem;
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    z-index: 1000;
    animation: fadeInOut 3s ease;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

@keyframes fadeInOut {
    0% { opacity: 0; transform: translate(-50%, 20px); }
    15% { opacity: 1; transform: translate(-50%, 0); }
    85% { opacity: 1; transform: translate(-50%, 0); }
    100% { opacity: 0; transform: translate(-50%, -20px); }
}

.timeline-item-content {
    margin-bottom: var(--space-6);
}

.timeline-item-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: var(--space-3);
}

.timeline-item-period {
    font-size: var(--font-size-sm);
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.timeline-item-description {
    color: var(--text-secondary);
    line-height: 1.7;
}

.timeline-item-description p {
    margin-bottom: var(--space-3);
    font-size: var(--font-size-base);
}

.timeline-item-description p:last-child {
    margin-bottom: 0;
}

.timeline-content h3 {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: var(--space-2);
}

.company-header {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

.company-header h4 {
    font-size: var(--font-size-lg);
    color: var(--primary-color);
    font-weight: 500;
}

.company-appstore-link {
    color: var(--text-secondary);
    font-size: 1.2rem;
    transition: color 0.3s ease;
    text-decoration: none;
    display: flex;
    align-items: center;
}

.company-appstore-link:hover {
    color: var(--primary-color);
}

/* 플레이스토어 링크 스타일 추가 */
.company-playstore-link {
    color: var(--text-secondary);
    font-size: 1.2rem;
    transition: color 0.3s ease;
    text-decoration: none;
    display: flex;
    align-items: center;
}

.company-playstore-link:hover {
    color: var(--primary-color);
}

/* 앱스토어, 플레이스토어 아이콘 공통 스타일 */
.company-header a {
    color: var(--text-secondary);
    font-size: 1.2rem;
    transition: color 0.3s ease;
    text-decoration: none;
    display: flex;
    align-items: center;
}

.company-header a:hover {
    color: var(--primary-color);
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: 1000;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.modal.active {
    display: flex;
    opacity: 1;
}

.modal-content {
    background: var(--surface-color);
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 800px;
    max-height: 90vh;
    margin: auto;
    position: relative;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transform: translateY(20px);
    transition: transform 0.3s ease;
}

.modal.active .modal-content {
    transform: translateY(0);
}

.modal-header {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-title {
    margin: 0;
    color: var(--text-color);
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0.5rem;
    transition: color 0.3s ease;
}

.modal-close:hover {
    color: var(--text-color);
}

.modal-body {
    padding: 1.5rem;
    overflow-y: auto;
    max-height: calc(90vh - 4rem);
}

.readme-content {
    color: var(--text-color);
    line-height: 1.6;
}

.readme-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
}

.readme-content pre {
    background: rgba(0, 0, 0, 0.2);
    padding: 1rem;
    border-radius: var(--radius-md);
    overflow-x: auto;
}

.readme-content code {
    font-family: 'Fira Code', monospace;
}

.project-links button {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0;
    transition: color 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.project-links button:hover {
    color: var(--primary-color);
}

.project-title {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.project-period {
    font-size: var(--font-size-sm);
    color: var(--primary-color);
    font-weight: 500;
}