:root {
    /* Colors */
    --bg-primary: #0a0a0f;
    --bg-secondary: #13131a;
    --bg-elevated: #1a1a24;
    --bg-card: rgba(26, 26, 36, 0.8);
    
    --text-primary: #e8e8f0;
    --text-secondary: #a0a0b0;
    --text-tertiary: #70707d;
    
    --accent-primary: #00ffcc;
    --accent-secondary: #7000ff;
    --accent-gradient: linear-gradient(135deg, #00ffcc 0%, #7000ff 100%);
    
    --terminal-bg: #0c0c0c;
    --terminal-text: #00ff00;
    --terminal-prompt: #00aaff;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

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

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding: var(--spacing-sm) 0;
    z-index: 1000;
}

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

.nav-brand {
    font-size: 1.25rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.mode-toggle {
    background: var(--bg-elevated);
    color: var(--text-primary);
    border: 1px solid rgba(0, 255, 204, 0.3);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.875rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    transition: all var(--transition-medium);
}

.mode-toggle:hover {
    background: rgba(0, 255, 204, 0.1);
    border-color: var(--accent-primary);
    transform: translateY(-2px);
}

.toggle-icon {
    font-size: 1rem;
    transition: transform var(--transition-medium);
}

.mode-toggle:hover .toggle-icon {
    transform: translateX(4px);
}

/* Portfolio Mode */
.portfolio-mode {
    display: none;
    min-height: 100vh;
    padding-top: 70px;
}

.portfolio-mode.active {
    display: block;
}

/* Hero Section */
.hero {
    min-height: calc(100vh - 70px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2xl) var(--spacing-md);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 100%;
    height: 150%;
    background: radial-gradient(circle, rgba(0, 255, 204, 0.15) 0%, transparent 70%);
    pointer-events: none;
}

.hero-content {
    max-width: 800px;
    text-align: center;
    position: relative;
    z-index: 1;
}

.hero-tag {
    display: inline-block;
    background: rgba(0, 255, 204, 0.1);
    border: 1px solid rgba(0, 255, 204, 0.3);
    color: var(--accent-primary);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: 2rem;
    font-size: 0.875rem;
    margin-bottom: var(--spacing-md);
    animation: fadeInUp 0.6s ease;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-title {
    font-size: clamp(2.5rem, 8vw, 4rem);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInUp 0.8s ease;
}

.hero-subtitle {
    font-size: clamp(1rem, 3vw, 1.25rem);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    animation: fadeInUp 1s ease;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    line-height: 1.8;
    animation: fadeInUp 1.2s ease;
}

.highlight {
    color: var(--accent-primary);
    font-weight: 600;
}

.hero-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-xl);
    animation: fadeInUp 1.4s ease;
}

.btn {
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-md);
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-medium);
    display: inline-block;
}

.btn-primary {
    background: var(--accent-gradient);
    color: var(--bg-primary);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0, 255, 204, 0.3);
}

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

.btn-secondary:hover {
    background: rgba(0, 255, 204, 0.1);
    transform: translateY(-3px);
}

.hero-stats {
    display: flex;
    gap: var(--spacing-xl);
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 1.6s ease;
}

.stat-item {
    text-align: center;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    color: var(--text-tertiary);
    font-size: 0.875rem;
    margin-top: var(--spacing-xs);
}

/* Sections */
.section {
    padding: var(--spacing-3xl) var(--spacing-md);
}

.bg-elevated {
    background: var(--bg-secondary);
}

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

.section-title {
    font-size: clamp(2rem, 5vw, 2.5rem);
    font-weight: 700;
    margin-bottom: var(--spacing-xl);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.section-icon {
    font-size: 2rem;
}

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

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--accent-primary), var(--accent-secondary));
}

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

.timeline-marker {
    position: absolute;
    left: calc(-1 * var(--spacing-xl) - 6px);
    top: 8px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--accent-primary);
    box-shadow: 0 0 20px var(--accent-primary);
}

.timeline-content {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: all var(--transition-medium);
}

.timeline-content:hover {
    transform: translateX(10px);
    border-color: rgba(0, 255, 204, 0.3);
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-sm);
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.timeline-header h3 {
    font-size: 1.25rem;
    color: var(--text-primary);
}

.timeline-period {
    color: var(--accent-primary);
    font-size: 0.875rem;
    font-weight: 600;
}

.timeline-location {
    color: var(--text-tertiary);
    margin-bottom: var(--spacing-sm);
}

.timeline-detail {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.badge {
    background: rgba(0, 255, 204, 0.1);
    border: 1px solid rgba(0, 255, 204, 0.3);
    color: var(--accent-primary);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
}

/* Cards */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.card {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: all var(--transition-medium);
}

.card:hover {
    transform: translateY(-5px);
    border-color: rgba(0, 255, 204, 0.3);
    box-shadow: 0 10px 40px rgba(0, 255, 204, 0.1);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.card-header h3 {
    font-size: 1.25rem;
    color: var(--text-primary);
}

.card-period {
    color: var(--accent-primary);
    font-size: 0.875rem;
    font-weight: 600;
}

.card-subtitle,
.card-role {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.card-list {
    list-style: none;
    margin-bottom: var(--spacing-md);
}

.card-list li {
    color: var(--text-secondary);
    padding-left: var(--spacing-md);
    position: relative;
    margin-bottom: var(--spacing-xs);
}

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

.card-tags {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.tag {
    background: rgba(112, 0, 255, 0.1);
    border: 1px solid rgba(112, 0, 255, 0.3);
    color: var(--accent-secondary);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
}

/* Projects */
.project-card {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.project-header h3 {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.project-description {
    color: var(--text-secondary);
    line-height: 1.6;
    flex-grow: 1;
}

.project-links {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(0, 255, 204, 0.1);
    border: 1px solid rgba(0, 255, 204, 0.3);
    border-radius: var(--radius-sm);
    color: var(--accent-primary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 600;
    transition: all var(--transition-medium);
}

.project-link:hover {
    background: rgba(0, 255, 204, 0.2);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 255, 204, 0.2);
}

.link-icon {
    font-size: 1rem;
}


/* Skills */
.skills-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.skill-category {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
}

.skill-category-title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--accent-primary);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.skill-tag {
    background: rgba(0, 255, 204, 0.1);
    border: 1px solid rgba(0, 255, 204, 0.3);
    color: var(--text-primary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    transition: all var(--transition-medium);
}

.skill-tag:hover {
    background: rgba(0, 255, 204, 0.2);
    transform: translateY(-2px);
}

/* Contact */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.contact-card {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    text-decoration: none;
    color: var(--text-primary);
    transition: all var(--transition-medium);
}

.contact-card:hover {
    transform: translateY(-5px);
    border-color: rgba(0, 255, 204, 0.3);
    box-shadow: 0 10px 40px rgba(0, 255, 204, 0.1);
}

.contact-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.contact-label {
    color: var(--text-tertiary);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-xs);
}

.contact-value {
    color: var(--accent-primary);
    font-weight: 600;
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    padding: var(--spacing-xl);
    text-align: center;
    color: var(--text-tertiary);
}

/* Terminal Mode */
.terminal-mode {
    display: none;
    min-height: 100vh;
    padding: var(--spacing-md);
    background: var(--terminal-bg);
}

.terminal-mode.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.terminal-container {
    width: 100%;
    max-width: 1000px;
    background: #1a1a1a;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.terminal-header {
    background: #2d2d2d;
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    border-bottom: 1px solid #404040;
}

.terminal-buttons {
    display: flex;
    gap: var(--spacing-xs);
}

.terminal-button {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.terminal-button.red {
    background: #ff5f56;
}

.terminal-button.yellow {
    background: #ffbd2e;
}

.terminal-button.green {
    background: #27c93f;
}

.terminal-title {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.875rem;
    color: #888;
}

.terminal-body {
    background: var(--terminal-bg);
    padding: var(--spacing-lg);
    min-height: 70vh;
    max-height: 70vh;
    overflow-y: auto;
    font-family: 'JetBrains Mono', monospace;
}

.terminal-output {
    color: var(--terminal-text);
    font-size: 0.875rem;
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

.terminal-welcome {
    color: var(--terminal-text);
    margin-bottom: var(--spacing-md);
}

.terminal-welcome pre {
    color: var(--accent-primary);
    font-size: 0.5rem;
    line-height: 1.2;
}

.terminal-welcome p {
    margin-bottom: var(--spacing-xs);
}

.cmd-highlight {
    color: var(--terminal-prompt);
    font-weight: 600;
}

.terminal-input-line {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

.terminal-prompt {
    color: var(--terminal-prompt);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.875rem;
    white-space: nowrap;
}

.terminal-input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--terminal-text);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.875rem;
}

.terminal-line {
    margin-bottom: var(--spacing-xs);
}

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

.terminal-error {
    color: #ff5555;
}

.terminal-success {
    color: var(--accent-primary);
}

.terminal-dir {
    color: #55aaff;
}

.terminal-file {
    color: #aaaaaa;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--accent-primary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-secondary);
}

/* Responsive */
@media (max-width: 768px) {
    .hero {
        min-height: auto;
        padding: var(--spacing-xl) var(--spacing-md);
    }
    
    .hero-stats {
        gap: var(--spacing-md);
    }
    
    .section {
        padding: var(--spacing-2xl) var(--spacing-md);
    }
    
    .timeline {
        padding-left: var(--spacing-lg);
    }
    
    .card-grid {
        grid-template-columns: 1fr;
    }
    
    .skills-container {
        grid-template-columns: 1fr;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .terminal-welcome pre {
        font-size: 0.35rem;
    }
}