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

:root {
    --primary-color: #00758d;
    --secondary-color: #5dc9e2;
    --text-color: #333;
    --bg-color: #fffef9;
    --card-bg: #ffffff;
    --border-color: #e0e0e0;
    --hover-color: #f5f5f5;
}

[data-theme="dark"] {
    --primary-color: #5dc9e2;
    --secondary-color: #00758d;
    --text-color: #e8e8e8;
    --bg-color: #0f1419;
    --card-bg: #1a1f2e;
    --border-color: #2a2f3e;
    --hover-color: #252a3a;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
        sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    transition: background-color 0.3s ease, color 0.3s ease;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    transition: background-color 0.3s ease;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
}

nav {
    display: flex;
    gap: 2rem;
    align-items: center;
}

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

nav a:hover {
    color: var(--primary-color);
}

.theme-toggle {
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

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

/* Mobile menu */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 1.5rem;
    cursor: pointer;
}

.mobile-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem;
}

.mobile-nav.active {
    display: block;
}

.mobile-nav a {
    display: block;
    padding: 0.5rem 0;
    color: var(--text-color);
    text-decoration: none;
    border-bottom: 1px solid var(--border-color);
}

/* Main Content */
main {
    flex: 1;
    padding: 3rem 0;
}

.hero {
    text-align: center;
    margin-bottom: 4rem;
}

.hero h1 {
    font-size: 3rem;
    font-weight: bold;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.hero p {
    font-size: 1.2rem;
    color: var(--text-color);
    opacity: 0.8;
    max-width: 600px;
    margin: 0 auto;
}

/* Blog content */
.blog-container {
    max-width: 800px;
    margin: 0 auto;
}

.back-link {
    display: inline-block;
    margin-bottom: 2rem;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.back-link:hover {
    color: var(--secondary-color);
}

.blog-article {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 3rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.blog-article h1 {
    color: var(--primary-color);
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.blog-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 3rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.blog-date {
    color: var(--text-color);
    opacity: 0.7;
    font-size: 0.9rem;
}

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

.blog-tag {
    background-color: var(--secondary-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

.blog-content {
    font-size: 1.1rem;
    line-height: 1.8;
}

.blog-content p {
    margin-bottom: 1.5rem;
}

.blog-content p:first-of-type {
    font-size: 1.2rem;
    color: var(--text-color);
    opacity: 0.9;
}

.blog-content em {
    color: var(--secondary-color);
    font-style: italic;
}

.blog-content strong {
    color: var(--primary-color);
    font-weight: 600;
}

/* Technologies Grid */
.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.tech-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    color: var(--text-color);
}

.tech-card:hover {
    background-color: var(--hover-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.tech-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.tech-card h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.tech-card p {
    opacity: 0.8;
    font-size: 0.9rem;
}

/* Additional Links */
.additional-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-top: 3rem;
}

.link-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem 2rem;
    text-decoration: none;
    color: var(--text-color);
    transition: all 0.3s ease;
    min-width: 150px;
    text-align: center;
}

.link-card:hover {
    background-color: var(--hover-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.link-card h4 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

/* Projects Page */
.projects-container {
    display: none;
}

.projects-container.active {
    display: block;
}

.back-btn {
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    margin-bottom: 2rem;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.back-btn:hover {
    background-color: var(--hover-color);
}

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

.project-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    transition: all 0.3s ease;
}

.project-card:hover {
    background-color: var(--hover-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

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

.project-card p {
    opacity: 0.8;
    margin-bottom: 1rem;
}

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

.project-links a {
    color: var(--primary-color);
    text-decoration: none;
    font-size: 0.9rem;
    border: 1px solid var(--primary-color);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.project-links a:hover {
    background-color: var(--primary-color);
    color: var(--bg-color);
}

/* Footer */
footer {
    background-color: var(--card-bg);
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    text-align: center;
    margin-top: auto;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header-content nav {
        display: none;
    }

    .mobile-menu-btn {
        display: block;
    }

    .hero h1 {
        font-size: 2rem;
    }

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

    .additional-links {
        flex-direction: column;
        align-items: center;
    }

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

    /* blog pages */
    .nav-links {
        gap: 1rem;
    }

    .blog-article {
        padding: 2rem 1.5rem;
    }

    .blog-article h1 {
        font-size: 2rem;
    }

    .blog-meta {
        flex-direction: column;
        gap: 1rem;
        align-items: flex-start;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .tech-card {
        padding: 1.5rem;
    }

    .hero h1 {
        font-size: 1.8rem;
    }

    .nav-links {
        flex-direction: column;
        gap: 0.5rem;
    }

    .blog-article {
        padding: 1.5rem 1rem;
    }

    .blog-article h1 {
        font-size: 1.8rem;
    }

    .blog-content {
        font-size: 1rem;
    }
}