/* CSS Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Light Mode Color Palette */
    --primary-blue: #2563eb;
    --primary-blue-light: #3b82f6;
    --primary-blue-dark: #1e40af;
    --secondary-cyan: #06b6d4;
    --accent-green: #10b981;
    --neutral-900: #111827;
    --neutral-800: #1f2937;
    --neutral-700: #374151;
    --neutral-600: #4b5563;
    --neutral-500: #6b7280;
    --neutral-400: #9ca3af;
    --neutral-300: #d1d5db;
    --neutral-200: #e5e7eb;
    --neutral-100: #f3f4f6;
    --neutral-50: #f9fafb;
    --white: #ffffff;
    
    /* Semantic Colors for Light Mode */
    --bg-primary: var(--white);
    --bg-secondary: var(--neutral-50);
    --bg-tertiary: var(--neutral-100);
    --text-primary: var(--neutral-900);
    --text-secondary: var(--neutral-700);
    --text-tertiary: var(--neutral-600);
    --border-primary: var(--neutral-200);
    --border-secondary: var(--neutral-300);
    --card-bg: var(--white);
    --navbar-bg: rgba(255, 255, 255, 0.95);
    --navbar-bg-scrolled: rgba(255, 255, 255, 0.98);
    --hero-bg: linear-gradient(135deg, var(--neutral-50) 0%, rgba(37, 99, 235, 0.05) 100%);
    --code-bg: var(--neutral-800);
    --code-border: var(--neutral-600);
    
    /* Typography */
    --font-primary: 'Noto Sans KR', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
}

/* Dark Mode Color Variables */
body.dark-mode {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-tertiary: #94a3b8;
    --border-primary: #334155;
    --border-secondary: #475569;
    --card-bg: #1e293b;
    --navbar-bg: rgba(15, 23, 42, 0.95);
    --navbar-bg-scrolled: rgba(15, 23, 42, 0.98);
    --hero-bg: linear-gradient(135deg, #0f172a 0%, rgba(37, 99, 235, 0.1) 100%);
    --code-bg: #0f172a;
    --code-border: #334155;
    
    /* Dark mode shadow adjustments */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.2);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.3), 0 2px 4px -2px rgb(0 0 0 / 0.2);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.4), 0 4px 6px -4px rgb(0 0 0 / 0.3);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.5), 0 8px 10px -6px rgb(0 0 0 / 0.4);
}

/* Dark mode specific adjustments */
body.dark-mode .comment { color: #94a3b8; }
body.dark-mode .keyword { color: #93c5fd; }
body.dark-mode .string { color: #6ee7b7; }
body.dark-mode .function { color: #fbbf24; }
body.dark-mode .code-title { color: #cbd5e1; }
body.dark-mode .code-content pre { color: #f1f5f9; }

/* Smooth transitions for all elements */
*, *::before, *::after {
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

/* Smooth transitions for theme switching */
body {
    transition: background-color 0.3s ease, color 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

h1 { font-size: 3rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 2rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1.125rem; }

p {
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: var(--navbar-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-primary);
    z-index: 1000;
    transition: all 0.3s ease;
}

.navbar.scrolled {
    background: var(--navbar-bg-scrolled);
    box-shadow: var(--shadow-md);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.nav-logo a {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-blue);
    text-decoration: none;
    background: linear-gradient(135deg, var(--primary-blue), var(--secondary-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-xl);
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    position: relative;
    transition: color 0.3s ease;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-blue);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-blue);
    transition: width 0.3s ease;
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background: var(--text-secondary);
    margin: 3px 0;
    transition: 0.3s;
}

/* Dark Mode Toggle Button */
.dark-mode-toggle {
    transition: all 0.3s ease !important;
}

.dark-mode-toggle:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-lg) !important;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: var(--hero-bg);
    padding-top: 80px;
    position: relative;
    overflow: hidden;
}

/* Animated Background */
.hero-bg-animation {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
}

/* Floating Shapes */
.floating-shapes {
    position: absolute;
    width: 100%;
    height: 100%;
}

.shape {
    position: absolute;
    opacity: 0.1;
    animation: float 6s ease-in-out infinite;
}

.shape-1 {
    width: 60px;
    height: 60px;
    background: linear-gradient(45deg, var(--primary-blue), var(--secondary-cyan));
    border-radius: 50%;
    top: 20%;
    left: 10%;
    animation-delay: 0s;
}

.shape-2 {
    width: 80px;
    height: 80px;
    background: linear-gradient(45deg, var(--secondary-cyan), var(--accent-green));
    clip-path: polygon(50% 0%, 0% 100%, 100% 100%);
    top: 60%;
    left: 85%;
    animation-delay: -2s;
}

.shape-3 {
    width: 40px;
    height: 40px;
    background: linear-gradient(45deg, var(--accent-green), var(--primary-blue));
    border-radius: 10px;
    top: 15%;
    right: 20%;
    animation-delay: -4s;
}

.shape-4 {
    width: 100px;
    height: 100px;
    background: linear-gradient(45deg, var(--primary-blue), var(--accent-green));
    clip-path: polygon(30% 0%, 70% 0%, 100% 30%, 100% 70%, 70% 100%, 30% 100%, 0% 70%, 0% 30%);
    top: 70%;
    left: 5%;
    animation-delay: -1s;
}

.shape-5 {
    width: 50px;
    height: 50px;
    background: linear-gradient(45deg, var(--secondary-cyan), var(--primary-blue));
    border-radius: 50%;
    top: 40%;
    left: 75%;
    animation-delay: -3s;
}

.shape-6 {
    width: 70px;
    height: 70px;
    background: linear-gradient(45deg, var(--accent-green), var(--secondary-cyan));
    clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
    top: 25%;
    left: 50%;
    animation-delay: -5s;
}

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

/* Particles */
.particles {
    position: absolute;
    width: 100%;
    height: 100%;
}

.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: var(--primary-blue);
    border-radius: 50%;
    opacity: 0.6;
    animation: particle-float 8s linear infinite;
}

@keyframes particle-float {
    0% {
        transform: translateY(100vh) translateX(0);
        opacity: 0;
    }
    10% {
        opacity: 0.6;
    }
    90% {
        opacity: 0.6;
    }
    100% {
        transform: translateY(-100px) translateX(100px);
        opacity: 0;
    }
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: grid !important;
    grid-template-columns: 60% 40% !important;
    grid-template-areas: "content visual" !important;
    gap: 40px !important;
    align-items: center;
    position: relative;
    z-index: 2;
    min-height: 80vh;
    width: 100%;
}

.hero-content {
    grid-area: content !important;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
    width: 100%;
}

.hero-text {
    flex: 1;
}

/* Hero Stats */
.hero-stats {
    display: flex;
    gap: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
    flex-wrap: wrap;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    background: var(--card-bg);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-primary);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    opacity: 0;
    transform: translateY(20px);
    animation: statSlideIn 0.8s ease forwards;
}

.stat-item:nth-child(1) { animation-delay: 3.2s; }
.stat-item:nth-child(2) { animation-delay: 3.4s; }
.stat-item:nth-child(3) { animation-delay: 3.6s; }

@keyframes statSlideIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.stat-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.stat-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary-blue), var(--secondary-cyan));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 1.1rem;
}

.stat-info {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-tertiary);
    font-weight: 500;
}

/* Hero Visual - 강제 표시 */
.hero-visual {
    grid-area: visual !important;
    display: flex !important;
    flex-direction: column;
    gap: var(--spacing-xl);
    position: relative;
    width: 100%;
    opacity: 1 !important;
    visibility: visible !important;
    transform: translateY(0) !important;
}

/* Profile Section */
.profile-section {
    background: var(--card-bg);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-primary);
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
    opacity: 1 !important;
    visibility: visible !important;
}

.profile-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-blue), var(--secondary-cyan), var(--accent-green));
}

.profile-avatar {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.avatar-container {
    position: relative;
    display: inline-block;
    margin-bottom: var(--spacing-lg);
}

.avatar-image {
    width: 100px;
    height: 100px;
    background: linear-gradient(135deg, var(--primary-blue), var(--secondary-cyan));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 2.5rem;
    position: relative;
    animation: none;
}

.avatar-status {
    position: absolute;
    bottom: 5px;
    right: 5px;
    background: var(--card-bg);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-md);
    border: 2px solid var(--border-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.75rem;
    animation: none;
}

.status-dot {
    width: 8px;
    height: 8px;
    background: var(--accent-green);
    border-radius: 50%;
    animation: none;
}

.profile-info h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    font-size: 1.25rem;
}

.profile-info p {
    color: var(--text-secondary);
    margin: 0;
    font-size: 0.9rem;
}

/* Tech Stack */
.tech-stack h4 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
    font-size: 1.1rem;
    text-align: center;
}

.tech-icons {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

/* tech-icon 관련 모든 스타일 제거됨 - 인라인 스타일로 처리 */

/* Code Window Adjustments - 애니메이션 완전 제거 */
.code-window {
    background: var(--code-bg);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    font-family: var(--font-mono);
    transition: none !important;
    margin: var(--spacing-xl) 0;
    border: 1px solid var(--border-primary);
    opacity: 1 !important;
    visibility: visible !important;
    width: 100%;
    max-width: 100%;
    transform: none !important;
}

.code-window:hover {
    transform: none !important;
    transition: none !important;
    box-shadow: var(--shadow-xl) !important;
}

.code-header {
    background: var(--code-border);
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
    border-bottom: 1px solid var(--border-secondary);
}

.code-dots {
    display: flex;
    gap: var(--spacing-sm);
}

.code-dots span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    animation: none;
}

.dot-1 { 
    background: #ef4444; 
}
.dot-2 { 
    background: #f59e0b; 
}
.dot-3 { 
    background: var(--accent-green); 
}

.code-title {
    color: var(--neutral-300);
    font-size: 0.875rem;
}

.code-status {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.status-indicator {
    width: 8px;
    height: 8px;
    background: var(--accent-green);
    border-radius: 50%;
    animation: none;
}

.status-text {
    color: var(--neutral-400);
    font-size: 0.75rem;
    animation: none;
}

/* Achievement Badges */
.achievement-badges {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.badge-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    background: var(--card-bg);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-primary);
    transition: all 0.3s ease;
    opacity: 0;
    transform: translateX(30px);
    animation: badgeSlideIn 0.6s ease forwards;
}

.badge-item:nth-child(1) { animation-delay: 4.6s; }
.badge-item:nth-child(2) { animation-delay: 4.8s; }
.badge-item:nth-child(3) { animation-delay: 5s; }

@keyframes badgeSlideIn {
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.badge-item:hover {
    background: linear-gradient(135deg, var(--primary-blue), var(--secondary-cyan));
    color: var(--white);
    transform: translateX(-5px);
    box-shadow: var(--shadow-md);
}

.badge-item:hover .badge-icon {
    background: rgba(255, 255, 255, 0.2);
    color: var(--white);
}

.badge-icon {
    width: 40px;
    height: 40px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-blue);
    font-size: 1.1rem;
    transition: all 0.3s ease;
}

.badge-text {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color 0.3s ease;
}

.badge-item:hover .badge-text {
    color: var(--white);
}

/* Section Styles */
section {
    padding: var(--spacing-3xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-title {
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.section-subtitle {
    font-size: 1.25rem;
    color: var(--text-tertiary);
    max-width: 600px;
    margin: 0 auto;
}

/* About Section */
.about {
    background: var(--bg-secondary);
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-3xl);
    align-items: start;
}

.about-text h3 {
    color: var(--primary-blue);
    margin-bottom: var(--spacing-lg);
}

.about-philosophy,
.growth-story,
.personal-info {
    margin-bottom: var(--spacing-2xl);
}

.timeline {
    position: relative;
    padding-left: var(--spacing-xl);
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 2px;
    background: var(--primary-blue);
}

.timeline-item {
    position: relative;
    margin-bottom: var(--spacing-xl);
}

.timeline-marker {
    position: absolute;
    left: -33px;
    top: 5px;
    width: 12px;
    height: 12px;
    background: var(--primary-blue);
    border-radius: 50%;
    border: 3px solid var(--card-bg);
}

.timeline-content h4 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

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

.personal-info li {
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--border-primary);
}

.about-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

.stat-card {
    background: var(--card-bg);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: transform 0.3s ease, background-color 0.3s ease;
    border: 1px solid var(--border-primary);
}

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

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-sm);
}

.stat-label {
    color: var(--text-tertiary);
    font-weight: 500;
}

/* Experience Section */
.experience-timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.experience-item {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-3xl);
    align-items: start;
}

.experience-period {
    background: var(--primary-blue);
    color: var(--white);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    text-align: center;
    font-weight: 600;
    font-size: 0.875rem;
}

.experience-content {
    background: var(--card-bg);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    border-left: 4px solid var(--border-primary);
    transition: all 0.3s ease;
    border: 1px solid var(--border-primary);
}

.experience-item.featured .experience-content {
    border-left-color: var(--primary-blue);
}

.experience-content:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.experience-content h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.experience-content h4 {
    color: var(--text-tertiary);
    font-weight: 500;
    margin-bottom: var(--spacing-md);
}

.experience-role {
    color: var(--primary-blue);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
}

.tech-achievements {
    margin-top: var(--spacing-lg);
}

.achievement {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-primary);
}

.achievement i {
    color: var(--primary-blue);
    font-size: 1.25rem;
}

/* Skills Section */
.skills {
    background: var(--bg-secondary);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-2xl);
}

.skill-category {
    background: var(--card-bg);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-primary);
    transition: background-color 0.3s ease;
}

.skill-category.core {
    border-top: 4px solid var(--primary-blue);
}

.skill-category h3 {
    color: var(--primary-blue);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.skill-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    transition: all 0.3s ease;
}

.skill-item:hover {
    background: var(--bg-tertiary);
    transform: translateX(5px);
}

.skill-item.expert {
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(6, 182, 212, 0.1));
}

.skill-icon {
    width: 50px;
    height: 50px;
    background: var(--primary-blue);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 1.25rem;
    flex-shrink: 0;
}

.skill-info {
    flex: 1;
}

.skill-info h4 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.skill-info p {
    color: var(--text-tertiary);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-md);
}

.skill-level {
    width: 100%;
    height: 8px;
    background: var(--border-primary);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.skill-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-blue), var(--secondary-cyan));
    border-radius: var(--radius-sm);
    transition: width 2s ease;
    animation: skillBarAnimation 2s ease;
}

@keyframes skillBarAnimation {
    from { width: 0; }
    to { width: var(--final-width); }
}

.specialty-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.specialty-tag {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.3s ease;
    border: 1px solid var(--border-primary);
}

.specialty-tag:hover {
    background: var(--primary-blue);
    color: var(--white);
    border-color: var(--primary-blue);
}

/* Blog Section */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
}

.blog-post {
    background: var(--card-bg);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
    border: 1px solid var(--border-primary);
}

.blog-post:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.blog-post.featured {
    grid-column: span 2;
    background: linear-gradient(135deg, var(--primary-blue), var(--secondary-cyan));
    color: var(--white);
}

.blog-post.featured .post-category,
.blog-post.featured h3,
.blog-post.featured .post-excerpt {
    color: var(--white);
}

.blog-post > * {
    padding: var(--spacing-xl);
}

.post-category {
    background: var(--accent-green);
    color: var(--white);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    display: inline-block;
    margin-bottom: var(--spacing-lg);
}

.blog-post h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.post-excerpt {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.post-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.post-tag {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 500;
    border: 1px solid var(--border-primary);
}

.blog-post.featured .post-tag {
    background: rgba(255, 255, 255, 0.2);
    color: var(--white);
    border-color: rgba(255, 255, 255, 0.3);
}

/* Contact Section */
.contact {
    background: var(--bg-secondary);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
}

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    border: 1px solid var(--border-primary);
}

.contact-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.contact-icon {
    width: 60px;
    height: 60px;
    background: var(--primary-blue);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 1.5rem;
}

.contact-details h4 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.contact-details a {
    color: var(--primary-blue);
    text-decoration: none;
    font-weight: 500;
}

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

.contact-form {
    background: var(--card-bg);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-primary);
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    color: var(--text-secondary);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--border-primary);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.3s ease, background-color 0.3s ease;
    background: var(--bg-primary);
    color: var(--text-primary);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-blue);
}

/* Footer */
.footer {
    background: var(--text-primary);
    color: var(--bg-primary);
    padding: var(--spacing-2xl) 0;
}

body.dark-mode .footer {
    background: #0f172a;
    color: var(--text-tertiary);
}

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

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
}

.footer-links a {
    color: inherit;
    text-decoration: none;
    transition: color 0.3s ease;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 80px;
        flex-direction: column;
        background: var(--card-bg);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: var(--shadow-lg);
        padding: var(--spacing-xl) 0;
        border-top: 1px solid var(--border-primary);
    }

    .nav-menu.active {
        left: 0;
    }

    .hamburger {
        display: flex;
    }

    .hamburger.active .bar:nth-child(2) {
        opacity: 0;
    }

    .hamburger.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }

    .hamburger.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }

    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-2xl);
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .stat-item {
        min-width: 120px;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-cta {
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .hero-visual {
        order: -1;
    }
    
    .profile-section {
        padding: var(--spacing-lg);
    }
    
    .avatar-image {
        width: 80px;
        height: 80px;
        font-size: 2rem;
    }
    
    .tech-icons {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .tech-icon {
        width: 50px;
        height: 50px;
        font-size: 1.2rem;
    }
    
    .achievement-badges {
        flex-direction: row;
        flex-wrap: wrap;
        gap: var(--spacing-sm);
    }
    
    .badge-item {
        flex: 1;
        min-width: 140px;
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .badge-icon {
        width: 30px;
        height: 30px;
        font-size: 0.9rem;
    }

    .about-content {
        grid-template-columns: 1fr;
    }

    .about-stats {
        grid-template-columns: 1fr 1fr;
    }

    .experience-item {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

    .experience-period {
        width: fit-content;
        margin: 0 auto;
    }

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

    .blog-post.featured {
        grid-column: span 1;
    }

    .contact-content {
        grid-template-columns: 1fr;
    }

    .footer-content {
        flex-direction: column;
        gap: var(--spacing-lg);
        text-align: center;
    }

    h1 { font-size: 2.5rem; }
    h2 { font-size: 2rem; }
    h3 { font-size: 1.5rem; }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }

    .hero-title {
        font-size: 2rem;
    }
    
    .hero-stats {
        flex-direction: column;
        align-items: center;
    }
    
    .stat-item {
        width: 100%;
        max-width: 200px;
    }
    
    .hero-keywords {
        justify-content: center;
    }

    .about-stats {
        grid-template-columns: 1fr;
    }

    .skill-item {
        flex-direction: column;
        text-align: center;
    }
    
    .tech-icons {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-sm);
    }
    
    .tech-icon {
        width: 45px;
        height: 45px;
        font-size: 1.1rem;
    }
    
    .achievement-badges {
        flex-direction: column;
    }
    
    .badge-item {
        width: 100%;
        min-width: unset;
    }
}

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

.fade-in-up {
    animation: fadeInUp 0.6s ease forwards;
}

/* Smooth transitions for all interactive elements */
a, button, .btn, .skill-item, .blog-post, .contact-item {
    transition: all 0.3s ease;
}

/* Focus styles for accessibility */
a:focus, button:focus, input:focus, textarea:focus {
    outline: 2px solid var(--primary-blue);
    outline-offset: 2px;
}

/* Hero Title and Basic Styles */
.hero-title {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

/* Typewriter Effect */
.typewriter-container {
    position: relative;
    display: inline-block;
}

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

.cursor {
    color: var(--primary-blue);
    animation: blink 1s infinite;
    font-weight: normal;
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

/* Fade in animations - 복원 */
.fade-in-delayed {
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 1s ease forwards;
}

/* hero-visual만 애니메이션 없이 바로 표시 */
.hero-visual.fade-in-delayed {
    opacity: 1 !important;
    transform: translateY(0) !important;
    animation: none !important;
}

.hero-subtitle.fade-in-delayed {
    animation-delay: 2s;
}

.hero-description.fade-in-delayed {
    animation-delay: 2.5s;
}

.hero-keywords.fade-in-delayed {
    animation-delay: 3s;
}

.hero-cta.fade-in-delayed {
    animation-delay: 3.5s;
}

/* Keywords animation */
.hero-keywords .keyword {
    opacity: 0;
    transform: translateY(20px);
    animation: keywordSlideIn 0.6s ease forwards;
}

@keyframes keywordSlideIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.highlight {
    background: linear-gradient(135deg, var(--primary-blue), var(--secondary-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradientShift 3s ease-in-out infinite;
}

@keyframes gradientShift {
    0%, 100% { 
        filter: hue-rotate(0deg);
    }
    50% { 
        filter: hue-rotate(20deg);
    }
}

.hero-subtitle {
    font-size: 2rem;
    color: var(--neutral-700);
    margin-bottom: var(--spacing-lg);
}

.hero-description {
    font-size: 1.25rem;
    color: var(--neutral-600);
    margin-bottom: var(--spacing-xl);
}

.hero-keywords {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-2xl);
}

.keyword {
    background: var(--primary-blue);
    color: var(--white);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    transform: translateY(0);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

/* ::before 효과 제거 */
.keyword::before {
    display: none !important;
}

.keyword:hover::before {
    display: none !important;
}

.keyword:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.hero-cta {
    display: flex;
    gap: var(--spacing-lg);
}

.btn {
    display: inline-block;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-lg);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
    cursor: pointer;
    text-align: center;
    min-width: 140px;
}

/* ::before 효과 제거 */
.btn::before {
    display: none !important;
}

.btn:hover::before {
    display: none !important;
}

.btn-primary {
    background: var(--primary-blue);
    color: var(--white) !important;
    border-color: var(--primary-blue);
}

.btn-primary:hover {
    background: var(--primary-blue-dark);
    color: var(--white) !important;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: transparent !important;
    color: var(--primary-blue) !important;
    border: 2px solid var(--primary-blue) !important;
}

.btn-secondary:hover {
    background: var(--primary-blue) !important;
    color: var(--white) !important;
    border-color: var(--primary-blue) !important;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* 다크모드에서도 버튼 텍스트 보이도록 */
body.dark-mode .btn-secondary {
    background: transparent !important;
    color: var(--primary-blue) !important;
    border: 2px solid var(--primary-blue) !important;
}

body.dark-mode .btn-secondary:hover {
    background: var(--primary-blue) !important;
    color: var(--white) !important;
}

/* Code Window Enhanced Styles */
.code-window:hover {
    transform: none !important;
    transition: none !important;
    box-shadow: var(--shadow-xl) !important;
}

.code-header {
    background: var(--code-border);
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
}

.code-dots {
    display: flex;
    gap: var(--spacing-sm);
}

.code-dots span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    animation: none;
}

.dot-1 { 
    background: #ef4444; 
}
.dot-2 { 
    background: #f59e0b; 
}
.dot-3 { 
    background: var(--accent-green); 
}

.code-title {
    color: var(--neutral-300);
    font-size: 0.875rem;
}

.code-status {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.status-indicator {
    width: 8px;
    height: 8px;
    background: var(--accent-green);
    border-radius: 50%;
    animation: none;
}

.status-text {
    color: var(--neutral-400);
    font-size: 0.75rem;
    animation: none;
}

.line-numbers {
    color: var(--neutral-500);
    font-size: 0.875rem;
    line-height: 1.8;
    margin-right: var(--spacing-md);
    user-select: none;
    display: flex;
    flex-direction: column;
    min-width: 30px;
    flex-shrink: 0;
}

.line-numbers span {
    min-height: 1.6em;
}

.code-content {
    padding: var(--spacing-lg);
    display: flex;
    position: relative;
}

.line-numbers {
    color: var(--neutral-500);
    font-size: 0.875rem;
    line-height: 1.8;
    margin-right: var(--spacing-md);
    user-select: none;
    display: flex;
    flex-direction: column;
}

.line-numbers span {
    min-height: 1.6em;
}

.code-content pre {
    color: var(--neutral-300);
    font-size: 0.875rem;
    line-height: 1.8;
    overflow: visible;
    flex: 1;
    margin: 0;
    white-space: pre-wrap;
    word-wrap: break-word;
    font-family: var(--font-mono);
    animation: none;
    width: 100%;
    max-width: 100%;
    display: block;
}

/* Code typing animation */
@keyframes codeType {
    from { width: 0; }
    to { width: 100%; }
}

.code-content pre {
    overflow: hidden;
    white-space: nowrap;
    animation: codeType 4s steps(200) 1s both;
}

.comment { 
    color: #9ca3af; 
    font-style: italic;
}
.keyword { 
    color: #60a5fa; 
    background: none; 
    padding: 0; 
    border-radius: 0; 
    font-weight: bold;
}
.string { 
    color: #34d399; 
}
.function { 
    color: #fbbf24; 
    font-weight: bold;
}