/* ============================================================
   Site Header — sticky at top, always visible
   ============================================================ */

.site-header {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: 67px;
    z-index: 100;
    background: rgba(250, 247, 242, 0.96);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-light);
    box-shadow: 0 2px 24px var(--shadow);
}

.site-header__inner {
    max-width: var(--container);
    height: 100%;
    margin: 0 auto;
    padding: 0 var(--gutter);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
}

/* ── Brand: logo mark + name + tagline ─────────────────────── */
.brand {
    display: flex;
    align-items: center;
    gap: 0.9rem;
    text-decoration: none;
    flex-shrink: 0;
}
.brand__mark {
    width: 44px;
    height: 44px;
    background: var(--ink);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-serif);
    font-weight: 700;
    font-size: 16px;
    color: var(--gold-light);
    letter-spacing: -1px;
}
.brand__text {
    display: flex;
    flex-direction: column;
    line-height: 1.1;
}
.brand__name {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--ink);
}
.brand__tagline {
    font-size: 0.62rem;
    color: var(--gold);
    letter-spacing: 0.18em;
    text-transform: uppercase;
    font-family: var(--font-sans);
    font-weight: 500;
    margin-top: 2px;
}

/* ── Main nav ──────────────────────────────────────────────── */
.main-nav__list {
    display: flex;
    align-items: center;
    gap: 2.2rem;
    list-style: none;
}
.main-nav__list a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.8rem;
    letter-spacing: 0.07em;
    text-transform: uppercase;
    font-weight: 400;
    transition: color 0.2s;
    position: relative;
    padding: 0.3rem 0;
}
.main-nav__list a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0; right: 0;
    height: 1px;
    background: var(--gold);
    transform: scaleX(0);
    transition: transform 0.25s;
    transform-origin: left;
}
.main-nav__list a:hover,
.main-nav__list a.is-active {
    color: var(--gold);
}
.main-nav__list a:hover::after,
.main-nav__list a.is-active::after {
    transform: scaleX(1);
}

.main-nav__toggle {
    display: none;
    background: transparent;
    border: none;
    cursor: pointer;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
}
.main-nav__toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--ink);
    transition: transform 0.25s, opacity 0.25s;
}
.main-nav__toggle[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}
.main-nav__toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
}
.main-nav__toggle[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ── Auth (login + register) ───────────────────────────────── */
.header-auth {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-shrink: 0;
}
.header-auth__link {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.78rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    font-weight: 400;
    transition: color 0.2s;
}
.header-auth__link:hover { color: var(--gold); }

.header-auth__btn {
    background: var(--ink);
    color: var(--gold-light);
    padding: 0.55rem 1.4rem;
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    font-weight: 500;
    text-decoration: none;
    border-radius: 2px;
    transition: all 0.25s;
}
.header-auth__btn:hover {
    background: var(--gold);
    color: var(--ink);
}

/* ── Mobile ────────────────────────────────────────────────── */
@media (max-width: 900px) {
    .site-header__inner {
        gap: 1rem;
    }
    .brand__tagline { display: none; }
    .brand__mark    { width: 38px; height: 38px; font-size: 14px; }
    .brand__name    { font-size: 1.05rem; }

    .main-nav__toggle { display: flex; }

    .main-nav__list {
        position: absolute;
        top: var(--header-h);
        left: 0; right: 0;
        flex-direction: column;
        gap: 0;
        background: var(--cream);
        border-bottom: 1px solid var(--border);
        padding: 1rem var(--gutter);
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
    }
    .main-nav[data-open="true"] .main-nav__list {
        max-height: 70vh;
        overflow-y: auto;
    }
    .main-nav__list li {
        width: 100%;
        border-bottom: 1px solid var(--border-light);
    }
    .main-nav__list li:last-child { border-bottom: none; }
    .main-nav__list a {
        display: block;
        padding: 0.9rem 0;
        width: 100%;
    }

    .header-auth__link { display: none; }   /* keep only Register on mobile */
}