/* ============================================
   Modern Web Design - CSS Variables
   ============================================ */
:root {
    /* Dark Mode Colors */
    --dark-bg: #0a0a0f;
    --dark-surface: #151520;
    --dark-surface-elevated: #1a1a2e;
    --dark-text: #ffffff;
    --dark-text-secondary: #a0a0b0;
    --dark-border: rgba(100, 150, 255, 0.1);
    
    /* Accent Colors */
    --accent-primary: #6366f1;
    --accent-primary-hover: #818cf8;
    --accent-secondary: #8b5cf6;
    --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    
    /* Glass Morphism */
    --glass-bg: rgba(21, 21, 32, 0.6);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-backdrop: blur(20px) saturate(180%);
    
    /* Light Mode Colors */
    --light-bg: #fafafa;
    --light-surface: #ffffff;
    --light-surface-elevated: #f5f5f5;
    --light-text: #1a1a1a;
    --light-text-secondary: #6b7280;
    --light-border: rgba(0, 0, 0, 0.08);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 3rem;
    --spacing-xl: 5rem;
    --spacing-2xl: 8rem;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Courier New', monospace;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3.5rem;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);
    --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.3);
    
    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Layout */
    --header-height: 80px;
    --container-max-width: 1280px;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: calc(var(--header-height) + 2rem);
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    transition: background-color var(--transition-base), color var(--transition-base);
}

body.dark-mode {
    background-color: var(--dark-bg);
    color: var(--dark-text);
}

body:not(.dark-mode) {
    background-color: var(--light-bg);
    color: var(--light-text);
}

/* ============================================
   Container
   ============================================ */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ============================================
   Theme Toggle
   ============================================ */
.theme-toggle {
    position: fixed;
    top: var(--spacing-md);
    right: var(--spacing-md);
    z-index: 1000;
    width: 50px;
    height: 50px;
    border-radius: var(--radius-full);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-lg);
    transition: var(--transition-base);
    backdrop-filter: var(--glass-backdrop);
    -webkit-backdrop-filter: var(--glass-backdrop);
}

.dark-mode .theme-toggle {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--dark-text);
}

.dark-mode .theme-toggle:hover {
    background: var(--dark-surface-elevated);
    transform: scale(1.1);
}

body:not(.dark-mode) .theme-toggle {
    background: rgba(255, 255, 255, 0.8);
    border: 1px solid var(--light-border);
    color: var(--light-text);
}

body:not(.dark-mode) .theme-toggle:hover {
    background: var(--light-surface);
    transform: scale(1.1);
}

/* ============================================
   Navigation
   ============================================ */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 999;
    padding: var(--spacing-sm) 0;
    transition: var(--transition-base);
    backdrop-filter: var(--glass-backdrop);
    -webkit-backdrop-filter: var(--glass-backdrop);
}

.dark-mode .nav {
    background: var(--glass-bg);
    border-bottom: 1px solid var(--dark-border);
}

body:not(.dark-mode) .nav {
    background: rgba(255, 255, 255, 0.8);
    border-bottom: 1px solid var(--light-border);
}

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

.nav-logo {
    font-size: var(--font-size-xl);
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-decoration: none;
    letter-spacing: 0.05em;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav-link {
    position: relative;
    color: var(--dark-text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: var(--font-size-sm);
    transition: var(--transition-base);
    padding: var(--spacing-xs) 0;
}

.dark-mode .nav-link {
    color: var(--dark-text-secondary);
}

.dark-mode .nav-link:hover,
.dark-mode .nav-link.active {
    color: var(--dark-text);
}

body:not(.dark-mode) .nav-link {
    color: var(--light-text-secondary);
}

body:not(.dark-mode) .nav-link:hover,
body:not(.dark-mode) .nav-link.active {
    color: var(--light-text);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-gradient);
    transition: width var(--transition-base);
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.nav-toggle span {
    width: 25px;
    height: 2px;
    background: currentColor;
    transition: var(--transition-base);
}

.dark-mode .nav-toggle {
    color: var(--dark-text);
}

body:not(.dark-mode) .nav-toggle {
    color: var(--light-text);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: var(--header-height);
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 0;
}

.hero-pattern {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url("blockchain-pattern.svg");
    background-size: 240px 180px;
    background-repeat: repeat;
    opacity: 0.15;
}

.dark-mode .hero-pattern {
    opacity: 0.15;
}

body:not(.dark-mode) .hero-pattern {
    opacity: 0.05;
}

.hero-gradient {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 50%, rgba(99, 102, 241, 0.1) 0%, transparent 50%);
}

.hero-container {
    position: relative;
    z-index: 1;
    width: 100%;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    animation: fadeInUp 1s ease;
    padding-top: var(--spacing-lg);
}

.hero-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 500;
    margin-bottom: var(--spacing-lg);
    backdrop-filter: var(--glass-backdrop);
    -webkit-backdrop-filter: var(--glass-backdrop);
}

.dark-mode .hero-badge {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--accent-primary);
}

body:not(.dark-mode) .hero-badge {
    background: rgba(255, 255, 255, 0.8);
    border: 1px solid var(--light-border);
    color: var(--accent-primary);
}

.hero-title {
    font-size: clamp(var(--font-size-3xl), 8vw, var(--font-size-5xl));
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

.dark-mode .hero-title {
    color: var(--dark-text);
}

body:not(.dark-mode) .hero-title {
    color: var(--light-text);
}

.hero-title-line {
    display: block;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--accent-primary);
}

.hero-description {
    font-size: var(--font-size-lg);
    max-width: 600px;
    margin: 0 auto var(--spacing-lg);
    color: var(--dark-text-secondary);
}

.dark-mode .hero-description {
    color: var(--dark-text-secondary);
}

body:not(.dark-mode) .hero-description {
    color: var(--light-text-secondary);
}

.hero-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

.hero-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    max-width: 600px;
    margin: var(--spacing-xl) auto 0;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    backdrop-filter: var(--glass-backdrop);
    -webkit-backdrop-filter: var(--glass-backdrop);
}

.dark-mode .hero-info {
    background: var(--glass-bg);
    border: 1px solid var(--dark-border);
}

body:not(.dark-mode) .hero-info {
    background: rgba(255, 255, 255, 0.8);
    border: 1px solid var(--light-border);
}

.hero-info-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: var(--font-size-sm);
}

.hero-info-item a {
    color: var(--dark-text-secondary);
    text-decoration: none;
    transition: var(--transition-base);
}

.dark-mode .hero-info-item a {
    color: var(--dark-text-secondary);
}

.dark-mode .hero-info-item a:hover {
    color: var(--accent-primary);
}

body:not(.dark-mode) .hero-info-item a {
    color: var(--light-text-secondary);
}

body:not(.dark-mode) .hero-info-item a:hover {
    color: var(--accent-primary);
}

.hero-info-item i {
    color: var(--accent-primary);
    font-size: var(--font-size-lg);
    width: 24px;
    text-align: center;
}

.hero-info-item code {
    font-family: var(--font-mono);
    font-size: var(--font-size-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
}

.dark-mode .hero-info-item code {
    background: var(--dark-surface);
}

body:not(.dark-mode) .hero-info-item code {
    background: var(--light-surface-elevated);
}

.copy-btn {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--accent-primary);
    padding: var(--spacing-xs);
    transition: var(--transition-base);
    display: inline-flex;
    align-items: center;
}

.copy-btn:hover {
    transform: scale(1.1);
}

.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-lg);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-xs);
    color: var(--dark-text-secondary);
}

.dark-mode .scroll-indicator {
    color: var(--dark-text-secondary);
}

body:not(.dark-mode) .scroll-indicator {
    color: var(--light-text-secondary);
}

.scroll-line {
    width: 1px;
    height: 30px;
    background: currentColor;
    animation: scrollLine 2s infinite;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: var(--font-size-base);
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--accent-gradient);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: transparent;
    border: 2px solid;
}

.dark-mode .btn-secondary {
    border-color: var(--dark-border);
    color: var(--dark-text);
}

.dark-mode .btn-secondary:hover {
    background: var(--dark-surface-elevated);
    border-color: var(--accent-primary);
}

body:not(.dark-mode) .btn-secondary {
    border-color: var(--light-border);
    color: var(--light-text);
}

body:not(.dark-mode) .btn-secondary:hover {
    background: var(--light-surface-elevated);
    border-color: var(--accent-primary);
}

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-sm);
}

/* ============================================
   Sections
   ============================================ */
.section {
    padding: var(--spacing-2xl) 0;
    position: relative;
}

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

.dark-mode .section-alt {
    background: var(--dark-surface);
}

body:not(.dark-mode) .section-alt {
    background: var(--light-surface-elevated);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.section-number {
    display: inline-block;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--accent-primary);
    margin-bottom: var(--spacing-sm);
    font-family: var(--font-mono);
}

.section-title {
    font-size: clamp(var(--font-size-2xl), 5vw, var(--font-size-4xl));
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

.dark-mode .section-title {
    color: var(--dark-text);
}

body:not(.dark-mode) .section-title {
    color: var(--light-text);
}

.section-description {
    font-size: var(--font-size-lg);
    color: var(--dark-text-secondary);
}

.dark-mode .section-description {
    color: var(--dark-text-secondary);
}

body:not(.dark-mode) .section-description {
    color: var(--light-text-secondary);
}

/* ============================================
   About Section
   ============================================ */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: start;
}

.about-text {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.about-intro {
    font-size: var(--font-size-lg);
    font-weight: 500;
}

.dark-mode .about-text p {
    color: var(--dark-text-secondary);
}

body:not(.dark-mode) .about-text p {
    color: var(--light-text-secondary);
}

.about-highlights {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.highlight-card {
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    backdrop-filter: var(--glass-backdrop);
    -webkit-backdrop-filter: var(--glass-backdrop);
    transition: var(--transition-base);
    border: 1px solid transparent;
}

.dark-mode .highlight-card {
    background: var(--glass-bg);
    border-color: var(--dark-border);
}

.dark-mode .highlight-card:hover {
    background: var(--dark-surface-elevated);
    border-color: var(--accent-primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

body:not(.dark-mode) .highlight-card {
    background: rgba(255, 255, 255, 0.8);
    border-color: var(--light-border);
}

body:not(.dark-mode) .highlight-card:hover {
    background: var(--light-surface);
    border-color: var(--accent-primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.highlight-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl);
    background: var(--accent-gradient);
    color: white;
    margin-bottom: var(--spacing-md);
}

.highlight-card h3 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xs);
}

.dark-mode .highlight-card h3 {
    color: var(--dark-text);
}

body:not(.dark-mode) .highlight-card h3 {
    color: var(--light-text);
}

.highlight-card p {
    font-size: var(--font-size-sm);
    color: var(--dark-text-secondary);
}

.dark-mode .highlight-card p {
    color: var(--dark-text-secondary);
}

body:not(.dark-mode) .highlight-card p {
    color: var(--light-text-secondary);
}

/* ============================================
   Timeline / Experience
   ============================================ */
.timeline {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 20px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--accent-gradient);
    opacity: 0.3;
}

.dark-mode .timeline::before {
    background: var(--accent-gradient);
}

body:not(.dark-mode) .timeline::before {
    background: linear-gradient(to bottom, var(--accent-primary), var(--accent-secondary));
}

.timeline-item {
    position: relative;
    padding-left: var(--spacing-2xl);
    margin-bottom: var(--spacing-xl);
}

.timeline-marker {
    position: absolute;
    left: 12px;
    top: 0;
    width: 16px;
    height: 16px;
    border-radius: var(--radius-full);
    background: var(--accent-gradient);
    border: 3px solid;
}

.dark-mode .timeline-marker {
    border-color: var(--dark-bg);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

body:not(.dark-mode) .timeline-marker {
    border-color: var(--light-bg);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.timeline-content-card {
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    backdrop-filter: var(--glass-backdrop);
    -webkit-backdrop-filter: var(--glass-backdrop);
    border: 1px solid transparent;
    transition: var(--transition-base);
    max-width: 100%;
    overflow-x: hidden;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.dark-mode .timeline-content-card {
    background: var(--glass-bg);
    border-color: var(--dark-border);
}

.dark-mode .timeline-content-card:hover {
    background: var(--dark-surface-elevated);
    border-color: var(--accent-primary);
    transform: translateX(8px);
    box-shadow: var(--shadow-lg);
}

body:not(.dark-mode) .timeline-content-card {
    background: rgba(255, 255, 255, 0.8);
    border-color: var(--light-border);
}

body:not(.dark-mode) .timeline-content-card:hover {
    background: var(--light-surface);
    border-color: var(--accent-primary);
    transform: translateX(8px);
    box-shadow: var(--shadow-lg);
}

.timeline-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.timeline-date {
    font-family: var(--font-mono);
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--accent-primary);
}

.timeline-badge {
    font-size: var(--font-size-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-full);
    background: var(--accent-gradient);
    color: white;
    font-weight: 600;
}

.timeline-title {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-md);
}

.dark-mode .timeline-title {
    color: var(--dark-text);
}

body:not(.dark-mode) .timeline-title {
    color: var(--light-text);
}

.timeline-content {
    font-size: var(--font-size-sm);
    line-height: 1.8;
    word-wrap: break-word;
    overflow-wrap: break-word;
    max-width: 100%;
}

.dark-mode .timeline-content {
    color: var(--dark-text-secondary);
}

body:not(.dark-mode) .timeline-content {
    color: var(--light-text-secondary);
}

.timeline-content ul {
    list-style: none;
    padding-left: var(--spacing-md);
}

.timeline-content li {
    position: relative;
    padding-left: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.timeline-content li::before {
    content: '▹';
    position: absolute;
    left: 0;
    color: var(--accent-primary);
}

.timeline-content ul ul {
    margin-top: var(--spacing-sm);
    margin-left: var(--spacing-md);
}

.timeline-content strong {
    color: var(--accent-primary);
}

/* ============================================
   Skills Section
   ============================================ */
.skills-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.skills-category {
    margin-bottom: var(--spacing-lg);
}

.skills-category-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

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

.skills-category-header h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
}

.dark-mode .skills-category-header h3 {
    color: var(--dark-text);
}

body:not(.dark-mode) .skills-category-header h3 {
    color: var(--light-text);
}

.skills-category-desc {
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-lg);
    color: var(--dark-text-secondary);
}

.dark-mode .skills-category-desc {
    color: var(--dark-text-secondary);
}

body:not(.dark-mode) .skills-category-desc {
    color: var(--light-text-secondary);
}

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

.skill-card {
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    backdrop-filter: var(--glass-backdrop);
    -webkit-backdrop-filter: var(--glass-backdrop);
    border: 1px solid transparent;
    transition: var(--transition-base);
    text-align: center;
}

.dark-mode .skill-card {
    background: var(--glass-bg);
    border-color: var(--dark-border);
}

.dark-mode .skill-card:hover {
    background: var(--dark-surface-elevated);
    border-color: var(--accent-primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

body:not(.dark-mode) .skill-card {
    background: rgba(255, 255, 255, 0.8);
    border-color: var(--light-border);
}

body:not(.dark-mode) .skill-card:hover {
    background: var(--light-surface);
    border-color: var(--accent-primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.skill-icon {
    font-size: var(--font-size-2xl);
    color: var(--accent-primary);
    margin-bottom: var(--spacing-sm);
}

.skill-card h4 {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.dark-mode .skill-card h4 {
    color: var(--dark-text);
}

body:not(.dark-mode) .skill-card h4 {
    color: var(--light-text);
}

.skill-card p {
    font-size: var(--font-size-sm);
    color: var(--dark-text-secondary);
}

.dark-mode .skill-card p {
    color: var(--dark-text-secondary);
}

body:not(.dark-mode) .skill-card p {
    color: var(--light-text-secondary);
}

/* ============================================
   Projects Section
   ============================================ */
.projects-filter {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

.filter-btn {
    padding: var(--spacing-xs) var(--spacing-lg);
    border-radius: var(--radius-full);
    border: none;
    background: transparent;
    cursor: pointer;
    font-weight: 500;
    font-size: var(--font-size-sm);
    transition: var(--transition-base);
}

.dark-mode .filter-btn {
    color: var(--dark-text-secondary);
    border: 1px solid var(--dark-border);
}

.dark-mode .filter-btn:hover,
.dark-mode .filter-btn.active {
    background: var(--accent-gradient);
    color: white;
    border-color: transparent;
}

body:not(.dark-mode) .filter-btn {
    color: var(--light-text-secondary);
    border: 1px solid var(--light-border);
}

body:not(.dark-mode) .filter-btn:hover,
body:not(.dark-mode) .filter-btn.active {
    background: var(--accent-gradient);
    color: white;
    border-color: transparent;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--spacing-lg);
}

.project-card {
    border-radius: var(--radius-lg);
    backdrop-filter: var(--glass-backdrop);
    -webkit-backdrop-filter: var(--glass-backdrop);
    border: 1px solid transparent;
    transition: var(--transition-base);
    overflow: hidden;
    display: block;
}

.dark-mode .project-card {
    background: var(--glass-bg);
    border-color: var(--dark-border);
}

.dark-mode .project-card:hover {
    background: var(--dark-surface-elevated);
    border-color: var(--accent-primary);
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl), var(--shadow-glow);
}

body:not(.dark-mode) .project-card {
    background: rgba(255, 255, 255, 0.8);
    border-color: var(--light-border);
}

body:not(.dark-mode) .project-card:hover {
    background: var(--light-surface);
    border-color: var(--accent-primary);
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.project-card-header {
    padding: var(--spacing-lg);
    background: var(--accent-gradient);
    color: white;
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.project-icon {
    font-size: var(--font-size-2xl);
}

.project-card-header h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.project-card-body {
    padding: var(--spacing-lg);
}

.project-card-body p {
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
    color: var(--dark-text-secondary);
}

.dark-mode .project-card-body p {
    color: var(--dark-text-secondary);
}

body:not(.dark-mode) .project-card-body p {
    color: var(--light-text-secondary);
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
}

.project-tags span {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 500;
}

.dark-mode .project-tags span {
    background: var(--dark-surface);
    color: var(--accent-primary);
}

body:not(.dark-mode) .project-tags span {
    background: var(--light-surface-elevated);
    color: var(--accent-primary);
}

.project-role {
    font-size: var(--font-size-xs);
    color: var(--dark-text-secondary);
}

.dark-mode .project-role {
    color: var(--dark-text-secondary);
}

body:not(.dark-mode) .project-role {
    color: var(--light-text-secondary);
}

.project-card[style*="display: none"] {
    display: none !important;
}

/* ============================================
   Additional Information
   ============================================ */
.additional-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.additional-card {
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    backdrop-filter: var(--glass-backdrop);
    -webkit-backdrop-filter: var(--glass-backdrop);
    border: 1px solid transparent;
    transition: var(--transition-base);
}

.dark-mode .additional-card {
    background: var(--glass-bg);
    border-color: var(--dark-border);
}

.dark-mode .additional-card:hover {
    background: var(--dark-surface-elevated);
    border-color: var(--accent-primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

body:not(.dark-mode) .additional-card {
    background: rgba(255, 255, 255, 0.8);
    border-color: var(--light-border);
}

body:not(.dark-mode) .additional-card:hover {
    background: var(--light-surface);
    border-color: var(--accent-primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.additional-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl);
    background: var(--accent-gradient);
    color: white;
    margin-bottom: var(--spacing-md);
}

.additional-card h3 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-md);
}

.additional-card h3:not(:first-of-type) {
    margin-top: var(--spacing-lg);
}

.dark-mode .additional-card h3 {
    color: var(--dark-text);
}

body:not(.dark-mode) .additional-card h3 {
    color: var(--light-text);
}

.language-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.language-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.language-name {
    min-width: 80px;
    font-weight: 500;
    font-size: var(--font-size-sm);
}

.dark-mode .language-name {
    color: var(--dark-text);
}

body:not(.dark-mode) .language-name {
    color: var(--light-text);
}

.language-level {
    display: flex;
    gap: 4px;
    flex: 1;
}

.level-dot {
    width: 8px;
    height: 8px;
    border-radius: var(--radius-full);
    transition: var(--transition-base);
}

.dark-mode .level-dot {
    background: var(--dark-surface);
}

.dark-mode .level-dot.active {
    background: var(--accent-primary);
}

body:not(.dark-mode) .level-dot {
    background: var(--light-surface-elevated);
}

body:not(.dark-mode) .level-dot.active {
    background: var(--accent-primary);
}

.language-label {
    min-width: 60px;
    text-align: right;
    font-size: var(--font-size-xs);
    font-weight: 500;
    color: var(--dark-text-secondary);
}

.dark-mode .language-label {
    color: var(--dark-text-secondary);
}

body:not(.dark-mode) .language-label {
    color: var(--light-text-secondary);
}

.interests {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.interest-tag {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 500;
}

.dark-mode .interest-tag {
    background: var(--dark-surface);
    color: var(--accent-primary);
}

body:not(.dark-mode) .interest-tag {
    background: var(--light-surface-elevated);
    color: var(--accent-primary);
}

.pgp-section {
    margin-top: var(--spacing-lg);
}

.pgp-section h3 {
    font-size: var(--font-size-base);
    margin-bottom: var(--spacing-sm);
}

.pgp-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.pgp-info code {
    font-family: var(--font-mono);
    font-size: var(--font-size-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
}

.dark-mode .pgp-info code {
    background: var(--dark-surface);
}

body:not(.dark-mode) .pgp-info code {
    background: var(--light-surface-elevated);
}

/* ============================================
   Modal
   ============================================ */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 2000;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
}

.modal.show {
    display: flex;
}

.modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    z-index: 1;
    max-width: 600px;
    width: 100%;
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    backdrop-filter: var(--glass-backdrop);
    -webkit-backdrop-filter: var(--glass-backdrop);
}

.dark-mode .modal-content {
    background: var(--glass-bg);
    border: 1px solid var(--dark-border);
}

body:not(.dark-mode) .modal-content {
    background: rgba(255, 255, 255, 0.95);
    border: 1px solid var(--light-border);
}

.modal-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    border: none;
    background: transparent;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-lg);
    transition: var(--transition-base);
}

.dark-mode .modal-close {
    color: var(--dark-text-secondary);
}

.dark-mode .modal-close:hover {
    background: var(--dark-surface-elevated);
    color: var(--dark-text);
}

body:not(.dark-mode) .modal-close {
    color: var(--light-text-secondary);
}

body:not(.dark-mode) .modal-close:hover {
    background: var(--light-surface-elevated);
    color: var(--light-text);
}

.modal-content h2 {
    margin-bottom: var(--spacing-lg);
}

.dark-mode .modal-content h2 {
    color: var(--dark-text);
}

body:not(.dark-mode) .modal-content h2 {
    color: var(--light-text);
}

.modal-content pre {
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: var(--font-size-xs);
    line-height: 1.6;
    margin-bottom: var(--spacing-lg);
}

.dark-mode .modal-content pre {
    background: var(--dark-surface);
    color: var(--dark-text);
}

body:not(.dark-mode) .modal-content pre {
    background: var(--light-surface-elevated);
    color: var(--light-text);
}

/* ============================================
   Footer
   ============================================ */
.footer {
    padding: var(--spacing-xl) 0;
    border-top: 1px solid;
}

.dark-mode .footer {
    border-color: var(--dark-border);
    background: var(--dark-surface);
}

body:not(.dark-mode) .footer {
    border-color: var(--light-border);
    background: var(--light-surface-elevated);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-logo {
    font-size: var(--font-size-xl);
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-text {
    font-size: var(--font-size-sm);
}

.dark-mode .footer-text {
    color: var(--dark-text-secondary);
}

body:not(.dark-mode) .footer-text {
    color: var(--light-text-secondary);
}

/* ============================================
   WANTED Banner
   ============================================ */
.wanted-banner {
    display: block;
    margin: var(--spacing-lg) auto 0;
    text-decoration: none;
    max-width: 320px;
    animation: wantedFloat 3s ease-in-out infinite;
    transform-origin: center;
}

.wanted-frame {
    position: relative;
    padding: var(--spacing-md) var(--spacing-lg);
    border: 3px solid;
    border-radius: var(--radius-md);
    transform: rotate(-2deg);
    transition: var(--transition-base);
    backdrop-filter: var(--glass-backdrop);
    -webkit-backdrop-filter: var(--glass-backdrop);
    box-shadow: var(--shadow-lg);
}

.dark-mode .wanted-frame {
    background: var(--glass-bg);
    border-color: #ff6b6b;
    box-shadow: 0 0 30px rgba(255, 107, 107, 0.3), var(--shadow-xl);
}

body:not(.dark-mode) .wanted-frame {
    background: rgba(255, 255, 255, 0.95);
    border-color: #ff6b6b;
    box-shadow: 0 0 30px rgba(255, 107, 107, 0.2), var(--shadow-xl);
}

.wanted-banner:hover {
    animation-play-state: paused;
}

.wanted-banner:hover .wanted-frame {
    transform: rotate(0deg) scale(1.05);
    box-shadow: 0 0 40px rgba(255, 107, 107, 0.5), var(--shadow-xl);
}

.wanted-stars {
    position: absolute;
    top: -10px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: var(--spacing-xs);
    font-size: var(--font-size-base);
    color: #ffd700;
    text-shadow: 0 0 10px rgba(255, 215, 0, 0.8);
}

.wanted-title {
    font-size: var(--font-size-2xl);
    font-weight: 900;
    text-align: center;
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-sm);
    font-family: var(--font-mono);
    text-transform: uppercase;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.dark-mode .wanted-title {
    color: #ff6b6b;
}

body:not(.dark-mode) .wanted-title {
    color: #ff6b6b;
}

.wanted-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
}

.wanted-icon {
    font-size: var(--font-size-2xl);
    color: var(--accent-primary);
    animation: documentPulse 2s ease-in-out infinite;
}

.wanted-text {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
}

.wanted-slogan {
    font-size: var(--font-size-base);
    font-weight: 600;
    font-style: italic;
    text-align: center;
    white-space: nowrap;
}

.dark-mode .wanted-slogan {
    color: var(--dark-text);
}

body:not(.dark-mode) .wanted-slogan {
    color: var(--light-text);
}

.wanted-subtitle {
    font-size: var(--font-size-sm);
    font-weight: 500;
    opacity: 0.8;
}

.dark-mode .wanted-subtitle {
    color: var(--dark-text-secondary);
}

body:not(.dark-mode) .wanted-subtitle {
    color: var(--light-text-secondary);
}

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

@keyframes documentPulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.1);
    }
}

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

@keyframes scrollLine {
    0%, 100% {
        opacity: 0;
        transform: translateY(-10px);
    }
    50% {
        opacity: 1;
        transform: translateY(10px);
    }
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1024px) {
    .about-grid {
        grid-template-columns: 1fr;
    }
    
    .projects-grid {
        grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    }
    
    .skills-grid {
        grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 70px;
    }
    
    .wanted-banner {
        max-width: 100%;
        margin-top: var(--spacing-md);
    }
    
    .wanted-frame {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .wanted-title {
        font-size: var(--font-size-xl);
    }
    
    .wanted-icon {
        font-size: var(--font-size-xl);
    }
    
    .wanted-slogan {
        font-size: var(--font-size-sm);
    }
    
    .nav-menu {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--glass-bg);
        backdrop-filter: var(--glass-backdrop);
        -webkit-backdrop-filter: var(--glass-backdrop);
        padding: var(--spacing-lg);
        border-top: 1px solid;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition-base);
        gap: var(--spacing-md);
    }
    
    .dark-mode .nav-menu {
        border-color: var(--dark-border);
    }
    
    body:not(.dark-mode) .nav-menu {
        background: rgba(255, 255, 255, 0.95);
        border-color: var(--light-border);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
    
    .hero-title {
        font-size: var(--font-size-3xl);
    }
    
    .hero-actions {
        flex-direction: column;
        width: 100%;
    }
    
    .hero-actions .btn {
        width: 100%;
        justify-content: center;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .skills-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    }
    
    .additional-grid {
        grid-template-columns: 1fr;
    }
    
    .timeline::before {
        left: 15px;
    }
    
    .timeline-item {
        padding-left: var(--spacing-xl);
    }
    
    .timeline-marker {
        left: 7px;
    }
    
    .timeline-content ul {
        padding-left: var(--spacing-sm);
    }
    
    .timeline-content li {
        padding-left: var(--spacing-md);
    }
    
    .timeline-content ul ul {
        margin-left: var(--spacing-sm);
        padding-left: var(--spacing-sm);
    }
    
    .timeline-content-card {
        padding: var(--spacing-md);
    }
    
    .section {
        padding: var(--spacing-xl) 0;
    }
    
    .container {
        padding: 0 var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: var(--font-size-2xl);
    }
    
    .hero-subtitle {
        font-size: var(--font-size-lg);
    }
    
    .section-title {
        font-size: var(--font-size-2xl);
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
    }
    
    .timeline-content ul {
        padding-left: var(--spacing-xs);
    }
    
    .timeline-content li {
        padding-left: var(--spacing-sm);
        font-size: var(--font-size-xs);
    }
    
    .timeline-content ul ul {
        margin-left: var(--spacing-xs);
        padding-left: var(--spacing-xs);
    }
    
    .timeline-content-card {
        padding: var(--spacing-sm);
    }
    
    .timeline-item {
        padding-left: var(--spacing-lg);
    }
}