:root {
    --header-h: 78px;
    --header-bg: rgba(255,255,255,.78);
    --header-bg-dark: rgba(7,11,19,.72);
    --header-border: rgba(15,23,42,.08);
    --header-border-dark: rgba(255,255,255,.08);
    --header-shadow: 0 10px 22px rgba(2,8,23,.06);
}

/* Header */
.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--header-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--header-border);
    transition: background .25s ease, box-shadow .25s ease, border-color .25s ease;
}

@media (prefers-color-scheme: dark) {
    .site-header {
        background: var(--header-bg-dark);
        border-bottom: 1px solid var(--header-border-dark);
    }
}

.header-inner {
    min-height: var(--header-h);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    padding: 10px 0;
}

/* Brand */
.brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--text);
    font-weight: 900;
    letter-spacing: .01em;
}

.brand-logo {
    height: 54px; 
    width: auto;
    display: block;
    object-fit: contain;
}

/* Nav */
.nav {
    display: flex;
    align-items: center;
    gap: 10px;
}

    /* Link pills */
    .nav a {
        text-decoration: none;
        color: var(--muted);
        font-weight: 800;
        font-size: .95rem;
        padding: 10px 12px;
        border-radius: 999px;
        border: 1px solid transparent;
        transition: transform .12s ease, background .12s ease, color .12s ease, border-color .12s ease;
        position: relative;
    }

        .nav a:hover {
            color: var(--text);
            background: var(--chip);
            border-color: var(--chip-border);
            transform: translateY(-1px);
        }
        .nav a:after {
            content: none !important;
        }

/* Buttons */
.button {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    font-weight: 900;
    cursor: pointer;
    border: 1px solid transparent;
    border-radius: 999px;
    padding: 12px 16px;
    background: linear-gradient(90deg, var(--primary), #1d4ed8);
    color: #fff;
    box-shadow: var(--shadow-soft);
    transition: transform .16s ease, box-shadow .16s ease, filter .16s ease;
    text-align: center;
    justify-content: center;
    white-space: nowrap;
}

.nav a.button,
.nav a.button:visited,
.nav a.button:hover,
.nav a.button:active,
.nav a.button:focus {
    color: #fff !important;
}

.button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
    filter: brightness(1.02);
    color: #fff;
}

.button.small {
    padding: 10px 14px;
    font-size: .92rem;
}

.button-outline {
    background: transparent;
    border-color: color-mix(in oklab, var(--primary), transparent 40%);
    color: var(--text);
    box-shadow: none;
}

    .button-outline:hover {
        background: color-mix(in oklab, var(--primary), transparent 88%);
        border-color: color-mix(in oklab, var(--primary), transparent 55%);
    }


.visually-hidden {
    position: absolute !important;
    height: 1px;
    width: 1px;
    overflow: hidden;
    clip: rect(1px, 1px, 1px, 1px);
    white-space: nowrap;
}


.no-scroll {
    overflow: hidden;
}


.menu-toggle {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

/* Hamburger button */
.menu-btn {
    display: none;
    border: 1px solid var(--border);
    background: var(--card);
    border-radius: 14px;
    padding: 10px 12px;
    cursor: pointer;
    line-height: 0;
    box-shadow: var(--shadow-soft);
}

@media (prefers-color-scheme: dark) {
    .menu-btn {
        box-shadow: none;
    }
}

.menu-icon,
.menu-icon::before,
.menu-icon::after {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    position: relative;
    transition: transform .25s ease, opacity .25s ease, top .25s ease;
}

    .menu-icon::before,
    .menu-icon::after {
        content: '';
        position: absolute;
        left: 0;
    }

    .menu-icon::before {
        top: -7px;
    }

    .menu-icon::after {
        top: 7px;
    }

.nav-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(2,8,23,0.65);
    z-index: 999; 
}


@media (max-width: 880px) {
    .menu-btn {
        display: inline-block;
    }

    .nav {
        display: none;
    }


    .menu-toggle:checked ~ .nav {
        display: flex;
        flex-direction: column;
        position: absolute;
        right: 4%;
        top: calc(var(--header-h) - 6px);
        width: min(92vw, 320px);
        gap: 8px;
        background: rgba(255,255,255,0.985);
        border: 1px solid var(--header-border);
        border-radius: 18px;
        padding: 12px;
        box-shadow: var(--shadow);
        z-index: 1001;
    }

    @media (prefers-color-scheme: dark) {
        .menu-toggle:checked ~ .nav {
            background: rgba(7,11,19,0.985);
            border-color: var(--header-border-dark);
        }
    }

    .menu-toggle:checked ~ .nav a {
        width: 100%;
        justify-content: flex-start;
        padding: 12px 12px;
    }

    .menu-toggle:checked ~ .menu-btn .menu-icon {
        transform: rotate(45deg);
    }

        .menu-toggle:checked ~ .menu-btn .menu-icon::before {
            top: 0;
            transform: rotate(90deg);
        }

        .menu-toggle:checked ~ .menu-btn .menu-icon::after {
            opacity: 0;
        }

    /* Backdrop show */
    .menu-toggle:checked ~ .nav-backdrop {
        display: block;
    }
}

@media (max-width: 520px) {
    .menu-btn {
        transform: scale(1.1);
        transform-origin: center;
    }
}

@media (prefers-reduced-motion: reduce) {
    .site-header,
    .nav a,
    .button,
    .menu-icon,
    .menu-icon::before,
    .menu-icon::after {
        transition: none !important;
    }
}