:root {
    --bg-primary: #0a0e27;
    --bg-secondary: #151b3b;
    --bg-card: #1a2342;
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --accent: #00d4ff;
    --accent-dark: #0099cc;
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --border: #2d3a5c;
    --shadow: rgba(0, 212, 255, 0.1);
    /* Spacing scale */
    --space-1: 0.25rem;  /* 4px */
    --space-2: 0.5rem;   /* 8px */
    --space-3: 0.75rem;  /* 12px */
    --space-4: 1rem;     /* 16px */
    --space-6: 1.5rem;   /* 24px */
    --space-8: 2rem;     /* 32px */
    --space-12: 3rem;    /* 48px */
    --space-16: 4rem;    /* 64px */
    /* Typography scale */
    --text-xs: 0.75rem;   /* 12px */
    --text-sm: 0.875rem;  /* 14px */
    --text-base: 1rem;    /* 16px */
    --text-lg: 1.125rem;  /* 18px */
    --text-xl: 1.25rem;   /* 20px */
    --text-2xl: 1.5rem;  /* 24px */
    --text-3xl: 1.875rem; /* 30px */
    --text-4xl: 2.25rem;  /* 36px */
    --text-5xl: 3rem;     /* 48px */
    --text-6xl: 3.75rem;  /* 60px */
}

[data-theme="light"] {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-card: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --accent: #0ea5e9;
    --accent-dark: #0284c7;
    --success: #10b981;
    --border: #e2e8f0;
    --shadow: rgba(0, 0, 0, 0.1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background 0.3s, color 0.3s;
    font-size: var(--text-base);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(10, 14, 39, 0.9);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 1rem 0;
    border-bottom: 1px solid var(--border);
}

[data-theme="light"] .navbar {
    background: rgba(255, 255, 255, 0.9);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent);
    text-decoration: none;
}

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

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: var(--accent);
}

.theme-toggle {
    background: none;
    border: 2px solid var(--border);
    border-radius: 8px;
    padding: 0.5rem;
    cursor: pointer;
    color: var(--text-primary);
    transition: border-color 0.3s;
}

.theme-toggle:hover {
    border-color: var(--accent);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 6rem 0 4rem;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.profile-card {
    text-align: center;
    margin-bottom: 2rem;
}

.profile-img {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--accent);
    box-shadow: 0 8px 32px var(--shadow);
    margin-bottom: 1rem;
}

.profile-badge {
    display: inline-block;
    background: var(--success);
    color: white;
    padding: 0.25rem 1rem;
    border-radius: 16px;
    font-size: 0.85rem;
    font-weight: 600;
}

.hero-greeting {
    color: var(--accent);
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.hero-name {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, var(--text-primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-title {
    font-size: 1.5rem;
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: 1.5rem;
}

.hero-description {
    font-size: var(--text-base);
    color: var(--text-secondary);
    margin-bottom: var(--space-6);
    line-height: 1.8;
}

.hero-contact {
    display: flex;
    gap: var(--space-4);
    margin-bottom: var(--space-6);
    flex-wrap: wrap;
}

.hero-contact-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: var(--text-sm);
    padding: var(--space-2) var(--space-3);
    border: 1px solid var(--border);
    border-radius: 8px;
    transition: all 0.3s;
}

.hero-contact-link:hover {
    color: var(--accent);
    border-color: var(--accent);
    transform: translateY(-2px);
}

.hero-cta {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

.btn {
    padding: 0.75rem 2rem;
    border-radius: 8px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s;
    display: inline-block;
}

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

.btn-primary:hover {
    background: var(--accent-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow);
}

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

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

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

.social-link {
    color: var(--text-secondary);
    transition: color 0.3s, transform 0.3s;
    display: inline-flex;
}

.social-link:hover {
    color: var(--accent);
    transform: translateY(-2px);
}

/* Code Window */
.code-window {
    background: #1e1e1e;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.window-header {
    background: #2d2d2d;
    padding: 0.75rem 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.dot.red { background: #ff5f57; }
.dot.yellow { background: #ffbd2e; }
.dot.green { background: #28c840; }

.filename {
    margin-left: 1rem;
    color: #999;
    font-size: 0.9rem;
}

.code-window pre {
    padding: 1.5rem;
    color: #d4d4d4;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 0.9rem;
    line-height: 1.6;
    overflow-x: auto;
}

.keyword { color: #569cd6; }
.string { color: #ce9178; }
.function { color: #dcdcaa; }

/* Sections */
.section {
    padding: 6rem 0;
}

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

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 3rem;
    color: var(--text-primary);
}

/* About Section */
.about-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 4rem;
    align-items: start;
}

.about-text p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-size: 1.05rem;
    line-height: 1.8;
}

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

.stat-card {
    background: var(--bg-card);
    padding: 1.5rem;
    border-radius: 12px;
    text-align: center;
    border: 1px solid var(--border);
    transition: transform 0.3s, box-shadow 0.3s;
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px var(--shadow);
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 0.25rem;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Skills Section */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.skill-category {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border);
}

.skill-category h3 {
    color: var(--accent);
    margin-bottom: 1.5rem;
    font-size: 1.2rem;
}

.skill-item {
    margin-bottom: 1rem;
}

.skill-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
}

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

.skill-percent {
    color: var(--accent);
    font-weight: 600;
}

.skill-bar {
    height: 8px;
    background: var(--border);
    border-radius: 4px;
    overflow: hidden;
}

.skill-progress {
    height: 100%;
    background: linear-gradient(90deg, var(--accent), var(--accent-dark));
    border-radius: 4px;
    transition: width 1s ease-in-out;
}

/* Experience Timeline */
.timeline {
    position: relative;
    padding-left: 2rem;
}

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

.timeline-item {
    position: relative;
    margin-bottom: 3rem;
    padding-left: 2rem;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -2.5rem;
    top: 0;
    width: 12px;
    height: 12px;
    background: var(--accent);
    border-radius: 50%;
    border: 3px solid var(--bg-primary);
}

.timeline-header {
    margin-bottom: 1rem;
}

.timeline-header h3 {
    color: var(--text-primary);
    font-size: 1.3rem;
    margin-bottom: 0.25rem;
}

.timeline-role {
    color: var(--accent);
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.timeline-meta {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.timeline-description {
    list-style: none;
    margin-top: 1rem;
}

.timeline-description li {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    padding-left: 1.5rem;
    position: relative;
}

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

.timeline-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1rem;
}

.tech-tag {
    background: var(--bg-primary);
    color: var(--accent);
    padding: 0.25rem 0.75rem;
    border-radius: 16px;
    font-size: 0.85rem;
    border: 1px solid var(--accent);
}

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

.project-card {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border);
    transition: transform 0.3s, box-shadow 0.3s;
}

.project-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px var(--shadow);
}

.project-card h3 {
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.project-card p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

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

.project-link {
    color: var(--accent);
    text-decoration: none;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: gap 0.3s;
}

.project-link:hover {
    gap: 0.75rem;
}

/* Contact Section */
.contact-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.contact-text {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 2rem;
}

.contact-links {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: center;
}

.contact-link {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-secondary);
    text-decoration: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--border);
    transition: all 0.3s;
    min-width: 300px;
    justify-content: center;
}

.contact-link:hover {
    color: var(--accent);
    border-color: var(--accent);
    transform: translateX(4px);
}

/* Footer */
.footer {
    padding: 2rem 0;
    text-align: center;
    border-top: 1px solid var(--border);
    color: var(--text-secondary);
}

/* Responsive */
@media (max-width: 768px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

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

    .hero-cta {
        justify-content: center;
    }

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

    .nav-links {
        display: none;
    }

    .code-window {
        margin-top: 2rem;
    }
}