/* === CSS Variables === */
:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --accent: #58a6ff;
    --accent-hover: #79b8ff;
    --border: #30363d;
    --success: #3fb950;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --max-width: 800px;
    --nav-height: 60px;
}

/* Light mode */
[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f6f8fa;
    --bg-tertiary: #eaeef2;
    --text-primary: #1f2328;
    --text-secondary: #656d76;
    --accent: #0969da;
    --accent-hover: #0550ae;
    --border: #d0d7de;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* === Typography === */
h1, h2, h3, h4 {
    font-family: var(--font-mono);
    font-weight: 600;
    margin-bottom: 1rem;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 1.75rem; color: var(--accent); }
h3 { font-size: 1.25rem; }

p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

code, .mono {
    font-family: var(--font-mono);
}

/* === Layout === */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

main {
    padding: 2rem 0 4rem;
    min-height: calc(100vh - var(--nav-height) - 100px);
}

/* === Navigation === */
nav {
    position: sticky;
    top: 0;
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    height: var(--nav-height);
    z-index: 100;
}

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

.nav-brand {
    font-family: var(--font-mono);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    list-style: none;
    align-items: center;
}

.nav-links a {
    color: var(--text-secondary);
    font-size: 0.9rem;
    padding: 0.5rem 0;
    border-bottom: 2px solid transparent;
    transition: all 0.2s ease;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--text-primary);
    border-bottom-color: var(--accent);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
}

.theme-toggle {
    background: none;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 0.4rem 0.6rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.2s ease;
}

.theme-toggle:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

/* === Hero Section === */
.hero {
    padding: 4rem 0;
    text-align: center;
}

.hero h1 {
    margin-bottom: 0.5rem;
}

.hero .tagline {
    font-family: var(--font-mono);
    color: var(--accent);
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
}

.hero .intro {
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto 2rem;
}

.social-links {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.social-links a {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.2rem;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.9rem;
    transition: all 0.2s ease;
}

.social-links a:hover {
    background-color: var(--bg-tertiary);
    border-color: var(--accent);
}

/* === Quick Links === */
.quick-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-top: 3rem;
}

.quick-link {
    padding: 1.5rem;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    text-align: center;
    transition: all 0.2s ease;
}

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

.quick-link h3 {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.quick-link p {
    font-size: 0.85rem;
    margin: 0;
}

/* === Section Styles === */
.section {
    margin-bottom: 3rem;
}

.section-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border);
}

.section-header h2 {
    margin: 0;
}

/* === Experience Cards === */
.experience-item {
    padding: 1.5rem;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    margin-bottom: 1.5rem;
}

.experience-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.experience-header h3 {
    margin: 0;
    color: var(--text-primary);
}

.experience-header .company {
    color: var(--accent);
    font-family: var(--font-mono);
}

.experience-header .date {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.experience-item ul {
    list-style: none;
    padding-left: 0;
}

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

.experience-item li::before {
    content: ">";
    position: absolute;
    left: 0;
    color: var(--accent);
    font-family: var(--font-mono);
}

/* === Project Cards === */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.project-card {
    padding: 1.5rem;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    transition: all 0.2s ease;
}

.project-card:hover {
    border-color: var(--accent);
}

.project-card h3 {
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

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

.tech-tag {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    background-color: var(--bg-tertiary);
    border-radius: 4px;
    color: var(--text-secondary);
}

.project-links {
    margin-top: 1rem;
    display: flex;
    gap: 1rem;
}

/* === Certifications Grid === */
.certs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
}

.cert-card {
    padding: 1.25rem;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: all 0.2s ease;
}

.cert-card:hover {
    border-color: var(--success);
}

.cert-icon {
    font-size: 2rem;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-tertiary);
    border-radius: 8px;
}

.cert-info h3 {
    font-size: 0.95rem;
    margin-bottom: 0.25rem;
    color: var(--text-primary);
}

.cert-info p {
    font-size: 0.8rem;
    margin: 0;
    color: var(--text-secondary);
}

/* === Resume Page === */
.resume-actions {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background-color: var(--accent);
    color: var(--bg-primary);
    border-radius: 6px;
    font-weight: 500;
    transition: all 0.2s ease;
}

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

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--accent);
    color: var(--accent);
}

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

.resume-embed {
    width: 100%;
    height: 800px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background-color: var(--bg-secondary);
}

/* === Blog List === */
.blog-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.blog-post {
    padding: 1.5rem;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    transition: all 0.2s ease;
}

.blog-post:hover {
    border-color: var(--accent);
}

.blog-post h3 {
    margin-bottom: 0.5rem;
}

.blog-post h3 a {
    color: var(--text-primary);
}

.blog-post h3 a:hover {
    color: var(--accent);
}

.blog-meta {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.blog-tags {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
}

.blog-tag {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    padding: 0.2rem 0.5rem;
    background-color: var(--bg-tertiary);
    border-radius: 4px;
    color: var(--accent);
}

/* === Hobbies === */
.hobbies-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.hobby-card {
    padding: 1.5rem;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    text-align: center;
}

.hobby-card .hobby-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.hobby-card h3 {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

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

footer p {
    font-size: 0.85rem;
    margin: 0;
}

/* === Mobile Responsive === */
@media (max-width: 768px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.5rem; }

    .nav-links {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        right: 0;
        background-color: var(--bg-secondary);
        flex-direction: column;
        padding: 1rem;
        gap: 0;
        border-bottom: 1px solid var(--border);
        display: none;
    }

    .nav-links.active {
        display: flex;
    }

    .nav-links li {
        width: 100%;
    }

    .nav-links a {
        display: block;
        padding: 0.75rem;
        border-bottom: none;
    }

    .nav-toggle {
        display: block;
    }

    .hero {
        padding: 2rem 0;
    }

    .experience-header {
        flex-direction: column;
    }

    .projects-grid,
    .certs-grid {
        grid-template-columns: 1fr;
    }

    .resume-embed {
        height: 500px;
    }
}

/* === Utilities === */
.text-center { text-align: center; }
.text-muted { color: var(--text-secondary); }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }