header {
    position: fixed;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 95%;
    max-width: 1200px;
    margin-top: 1.5rem;
    padding: 1rem 2rem;
    background: rgba(0, 0, 0, 0.7);
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    border: 1px solid var(--card-border);
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 1.2rem;
}

.logo img,
.logo svg {
    width: 36px;
    height: 36px;
    object-fit: contain;
}

.logo svg path {
    stroke: currentColor;
}

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

nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.3s ease;
}

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

.header-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* removed theme-toggle button */

.try-playground {
    background: #fff;
    color: #000;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.menu-toggle {
    display: none;
    width: 42px;
    height: 42px;
    border: 1px solid var(--card-border);
    border-radius: 10px;
    background: rgba(0, 0, 0, 0.55);
    color: var(--text-primary);
    cursor: pointer;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 5px;
}

.menu-toggle span {
    width: 18px;
    height: 2px;
    border-radius: 2px;
    background: currentColor;
    transition: transform 0.25s ease, opacity 0.2s ease;
}

.menu-toggle.is-open span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.menu-toggle.is-open span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.is-open span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

.mobile-nav {
    position: fixed;
    top: 88px;
    left: 50%;
    transform: translateX(-50%);
    width: 95%;
    max-width: 1200px;
    border: 1px solid var(--card-border);
    border-radius: 12px;
    background: rgba(0, 0, 0, 0.92);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 0.75rem;
    display: none;
    flex-direction: column;
    gap: 0.2rem;
    z-index: 999;
}

.mobile-nav a {
    color: var(--text-primary);
    text-decoration: none;
    padding: 0.7rem 0.85rem;
    border-radius: 8px;
    font-size: 0.96rem;
}

.mobile-nav a:hover {
    background: rgba(255, 255, 255, 0.08);
}

body.menu-open {
    overflow: hidden;
}

@media (max-width: 768px) {
    header {
        padding: 0.85rem 1rem;
        margin-top: 1rem;
    }

    nav {
        display: none;
    }

    .header-right {
        margin-left: auto;
        display: flex;
        align-items: center;
        gap: 0.5rem;
    }

    .try-playground {
        font-size: 0.8rem;
        padding: 0.4rem 0.8rem;
    }

    .menu-toggle {
        display: inline-flex;
    }

    .mobile-nav {
        display: flex;
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
        transform: translateX(-50%) translateY(-10px);
        transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s ease;
    }

    .mobile-nav.is-open {
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
        transform: translateX(-50%) translateY(0);
    }
}

@media (max-width: 480px) {
    .logo {
        font-size: 1.05rem;
    }

    .try-playground {
        padding: 0.45rem;
    }
}

.portfolio-section {
    padding: 5rem 0;
    background-color: var(--bg-secondary);
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.portfolio-item {
    position: relative;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.portfolio-item:hover {
    transform: translateY(-5px);
}

.portfolio-item img {
    width: 100%;
    height: 250px;
    object-fit: cover;
}

.portfolio-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.8), transparent);
    padding: 1.5rem;
    color: white;
}

.portfolio-overlay h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.portfolio-overlay p {
    font-size: 0.9rem;
    opacity: 0.9;
}

.portfolio-cta {
    text-align: center;
}

.portfolio-page {
    padding: 5rem 0;
    min-height: calc(100vh - 80px);
}

.portfolio-page .section-title h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
    position: relative;
    display: inline-block;
}

.portfolio-page .section-title h1::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 50%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border-radius: 2px;
}

.portfolio-page .section-title p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-top: 1rem;
}

.portfolio-filters-container {
    background: var(--card-bg);
    background-color: rgba(var(--card-bg-rgb), 0.8);
    padding: 1rem 2rem;
    border-radius: 12px;
    margin: 2rem auto 3rem;
    max-width: 800px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    border: 1px solid var(--card-border);
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.portfolio-filters {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    flex-wrap: wrap;
    padding: 0.5rem;
    width: 100%;
}

.portfolio-filters button {
    padding: 0.75rem 1.5rem;
    border: none;
    background: transparent;
    border-radius: 6px;
    color: var(--text-secondary);
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.3s ease;
    position: relative;
    font-size: 0.95rem;
}

.portfolio-filters button.active {
    background: var(--primary-color);
    color: white;
}

.portfolio-filters button.active::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 3px;
    background: var(--primary-color);
    border-radius: 2px;
}

.footer {
    background: var(--bg-color);
    border-top: 1px solid var(--card-border);
    padding: 4rem 0 0;
    margin-top: 4rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 3rem;
}

.footer-section {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 1.2rem;
}

.footer-logo img {
    width: 36px;
    height: 36px;
    object-fit: contain;
}

.footer-description {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-top: -0.5rem;
}

.footer-section h3 {
    color: var(--text-primary);
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.footer-section ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-section ul li {
    margin-bottom: 0.75rem;
}

.footer-section ul li a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: var(--text-primary);
}

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

.social-links a {
    color: var(--text-secondary);
    transition: color 0.3s ease;
}

.social-links a:hover {
    color: var(--text-primary);
}

.contact-info li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-secondary);
}

.contact-info svg {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
}

.footer-bottom {
    margin-top: 4rem;
    padding: 1.5rem;
    text-align: center;
    border-top: 1px solid var(--card-border);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .footer {
        padding: 3rem 0 0;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
        padding: 0 1rem;
    }

    .footer-section {
        text-align: center;
    }

    .footer-logo {
        justify-content: center;
    }

    .social-links {
        justify-content: center;
    }

    .contact-info li {
        justify-content: center;
    }
}

@media (max-width: 1024px) and (min-width: 769px) {
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
}