.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: 100px;
    font-size: 15px;
    font-weight: 600;
    letter-spacing: 0.02em;
    transition: all var(--transition-base);
    border: 1.5px solid transparent;
}

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

.btn-arrow {
    font-size: 16px;
    transition: transform var(--transition-base);
}

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

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

.btn-outline-dark {
    border-color: var(--color-text-primary);
    color: var(--color-text-primary);
}

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

.btn-outline-white {
    border-color: var(--color-text-white);
    color: var(--color-text-white);
}

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

.btn-nav {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: 1.5px solid var(--color-border);
    color: var(--color-text-primary);
    transition: all var(--transition-base);
}

.btn-nav:hover {
    background: var(--color-text-primary);
    border-color: var(--color-text-primary);
    color: var(--color-text-white);
}

.btn-nav.swiper-button-disabled {
    opacity: 0.25;
    pointer-events: none;
}

.site-header {
    position: absolute;
    top: 18px;
    left: 18px;
    right: 18px;
    z-index: 1000;
    padding: 28px 60px;
    border-bottom: 1px solid transparent;
}

.site-header.scrolled {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    padding: 16px 60px;
    background: rgba(16, 18, 19, 0.82);
    backdrop-filter: blur(20px) saturate(1.2);
    -webkit-backdrop-filter: blur(20px) saturate(1.2);
    border-radius: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    box-shadow: 0 1px 30px rgba(0, 0, 0, 0.3);
}

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

.header-logo img {
    height: 40px;
    width: auto;
    transition: opacity var(--transition-base);
}

.logo-circle {
    display: flex;
    align-items: center;
    transition: opacity var(--transition-base);
}

.logo-circle svg {
    width: 44px;
    height: 44px;
}

.logo-circle:hover {
    opacity: 0.7;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 28px;
}

.btn-header-cta {
    display: inline-flex;
    align-items: center;
    color: var(--color-text-white);
    font-size: 15px;
    font-weight: 500;
    letter-spacing: 0.01em;
    transition: opacity var(--transition-base);
    border: none;
    background: none;
    padding: 0;
}

.btn-header-cta:hover {
    opacity: 0.6;
}

.hamburger-menu {
    display: flex;
    flex-direction: column;
    gap: 7px;
    width: 26px;
    padding: 4px 0;
    cursor: pointer;
    z-index: 1001;
}

.hamburger-line {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--color-text-white);
    border-radius: 2px;
    transition: all var(--transition-base);
    transform-origin: center;
}

.hamburger-menu.active .hamburger-line:first-child {
    transform: rotate(45deg) translate(3px, 3px);
}

.hamburger-menu.active .hamburger-line:last-child {
    transform: rotate(-45deg) translate(3px, -3px);
}

.overlay-menu {
    position: fixed;
    inset: 0;
    z-index: 999;
    background: var(--color-bg-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.overlay-menu.active {
    opacity: 1;
    visibility: visible;
}

.overlay-nav ul {
    display: flex;
    flex-direction: column;
    gap: 8px;
    text-align: center;
}

.overlay-nav ul li {
    overflow: hidden;
}

.overlay-nav ul li a {
    display: inline-block;
    font-size: clamp(32px, 5vw, 56px);
    font-weight: 600;
    color: var(--color-text-white);
    line-height: 1.2;
    transition: opacity var(--transition-base), transform var(--transition-base);
    transform: translateY(100%);
    opacity: 0;
}

.overlay-menu.active .overlay-nav ul li a {
    transform: translateY(0);
    opacity: 1;
}

.overlay-nav ul li:nth-child(1) a {
    transition-delay: 0.1s;
}

.overlay-nav ul li:nth-child(2) a {
    transition-delay: 0.15s;
}

.overlay-nav ul li:nth-child(3) a {
    transition-delay: 0.2s;
}

.overlay-nav ul li:nth-child(4) a {
    transition-delay: 0.25s;
}

.overlay-nav ul li:nth-child(5) a {
    transition-delay: 0.3s;
}

.overlay-nav ul li:nth-child(6) a {
    transition-delay: 0.35s;
}

.overlay-nav ul li:nth-child(7) a {
    transition-delay: 0.4s;
}

.overlay-nav ul li a:hover {
    opacity: 0.5;
}