/* Button */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    font-family: var(--font-primary);
    font-size: var(--text-sm);
    font-weight: 400;
    border-radius: var(--radius-sm);
    transition: all var(--transition-base);
    cursor: pointer;
}

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

.btn--primary:hover {
    background-color: #d42e3c;
    color: var(--color-white);
}

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

.btn--outline:hover {
    background-color: var(--color-white);
    color: var(--color-dark);
}

.btn__arrow {
    display: inline-block;
    transition: transform var(--transition-fast);
}

.btn:hover .btn__arrow {
    transform: translateX(4px);
}

/* Navigation */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: var(--spacing-md) 0;
    transition: background-color var(--transition-base), backdrop-filter var(--transition-base);
}

.site-header.is-scrolled {
    background-color: rgba(20, 20, 20, 0.7);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

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

.site-logo {
    position: relative;
    z-index: 101;
}

.site-logo svg,
.site-logo img {
    height: clamp(30px, 2.45vw, 47px);
    width: auto;
}

.main-nav__list {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.main-nav__link {
    font-family: var(--font-primary);
    font-size: var(--text-base);
    color: var(--color-white);
    transition: color var(--transition-fast);
}

.main-nav__link:hover,
.main-nav__link--active {
    color: var(--color-accent);
}


/* Mobile menu toggle */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    z-index: 101;
    position: relative;
}

.menu-toggle__bar {
    width: 28px;
    height: 2px;
    background-color: var(--color-white);
    transition: all var(--transition-base);
    transform-origin: center;
}

.menu-toggle.is-open .menu-toggle__bar:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

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

.menu-toggle.is-open .menu-toggle__bar:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

@media (max-width: 768px) {
    .menu-toggle {
        display: flex;
    }

    .main-nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 100%;
        height: 100vh;
        background-color: var(--color-dark);
        display: flex;
        align-items: center;
        justify-content: center;
        transition: right var(--transition-base);
    }

    .main-nav.is-open {
        right: 0;
    }

    .main-nav__list {
        flex-direction: column;
        gap: var(--spacing-lg);
    }

    .main-nav__link {
        font-size: var(--text-lg);
    }
}

/* Footer */
.site-footer {
    background-color: var(--color-dark-alt);
    padding: var(--spacing-lg) 0;
}

.site-footer .container {
    position: relative;
    padding-top: var(--spacing-lg);
}

.site-footer .container::before {
    content: '';
    position: absolute;
    top: 0;
    left: var(--container-padding);
    right: var(--container-padding);
    height: 1px;
    background-color: var(--color-gray);
}

.site-footer .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.footer-nav__list {
    display: flex;
    gap: var(--spacing-lg);
}

.footer-nav__link {
    font-size: var(--text-base);
    color: var(--color-white);
}

.footer-nav__link:hover {
    color: var(--color-accent);
}

.footer-copyright {
    font-size: var(--text-base);
    color: var(--color-light-gray);
}

.footer-logo svg,
.footer-logo img {
    height: clamp(30px, 2.45vw, 47px);
    width: auto;
}

/* Project card — shared */
.project-card {
    display: block;
}

.project-card__image {
    width: 100%;
    aspect-ratio: 18 / 7;
    object-fit: cover;
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-md);
}

.project-card__info {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.project-card__title {
    font-size: var(--text-45);
    color: var(--color-white);
    margin-bottom: var(--spacing-xs);
}

.project-card__desc {
    font-size: var(--text-md);
    color: var(--color-gray);
    letter-spacing: 0;
}

.project-card__tags {
    display: flex;
    gap: var(--spacing-sm);
}

.project-card__tag {
    font-size: var(--text-25);
    color: var(--color-border);
    padding: 0.5em 1em;
    border: 1px solid var(--color-dark-muted);
    border-radius: var(--radius-sm);
}

/* Shared fade animations */
.fade-up {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-up.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.fade-up-delay-1 { transition-delay: 0.15s; }
.fade-up-delay-2 { transition-delay: 0.3s; }
.fade-up-delay-3 { transition-delay: 0.45s; }

/* Shared button */
.btn--accent {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    background-color: var(--color-accent);
    color: var(--color-white);
    font-family: var(--font-primary);
    font-size: var(--text-md);
    padding: var(--spacing-sm) var(--spacing-lg);
    height: clamp(44px, 3.13vw, 60px);
    border: none;
    border-radius: var(--radius-sm);
    cursor: none;
    transition: background-color var(--transition-base);
    text-decoration: none;
}

.btn--accent:hover {
    background-color: #d42e3c;
    color: var(--color-white);
}

.btn--accent .btn-arrow {
    display: inline-block;
    width: clamp(20px, 1.56vw, 30px);
    height: 0;
    border-top: 1px solid var(--color-white);
    position: relative;
    transition: width var(--transition-fast);
}

.btn--accent .btn-arrow::after {
    content: '';
    position: absolute;
    right: -1px;
    top: -5px;
    width: 8px;
    height: 8px;
    border-right: 2px solid var(--color-white);
    border-top: 2px solid var(--color-white);
    transform: rotate(45deg);
}

.btn--accent:hover .btn-arrow {
    width: clamp(28px, 2.08vw, 40px);
}

@media (max-width: 1024px) {
    .project-card__info {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
}

@media (max-width: 768px) {
    .site-footer .container {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }

    .footer-nav__list {
        flex-wrap: wrap;
        justify-content: center;
        gap: var(--spacing-md);
    }

    .project-card__tags {
        flex-wrap: wrap;
    }

    .project-card__image {
        aspect-ratio: 1;
    }

    .project-card__title {
        font-size: var(--text-4xl);
    }

    .project-card__desc {
        font-size: var(--text-45);
    }
}