/* ═══════════════════════════════════════════════
   HEADER.CSS
   Site header: top bar, main nav, logo, hamburger,
   mobile dropdown menu. Used on every page.
   ═══════════════════════════════════════════════ */

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--white);
}

/* Top bar */

.top-bar {
    background: var(--white);
    border-bottom: 1px solid rgba(0,0,0,0.05);
    padding: 0.5rem 1rem;
}

.top-bar-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.top-bar-link {
    color: var(--muted);
    text-decoration: none;
    font-size: 0.85rem;
    text-align: center;
}

.top-bar-divider {
    display: none;
}

/* Navigation */

nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1rem;
    background: rgba(255,255,255,0.97);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    box-sizing: border-box;
}

/* Logo */

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    flex: 1;
    min-width: 0;
}

.logo-img {
    width: 40px;
    height: 40px;
    object-fit: contain;
    flex-shrink: 0;
}

.logo-text {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 700;
    color: var(--bg-dark);
    line-height: 1.15;
    white-space: normal;
    word-break: break-word;
}

/* HAMBURGER */

.hamburger {
    display: flex;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    flex-shrink: 0;
}

.hamburger span {
    width: 24px;
    height: 2px;
    background: #333;
    transition: 0.3s;
}

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

.hamburger.open span:nth-child(2) {
    opacity: 0;
}

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

/* Mobile menu */

.nav-links {
    display: none;
    list-style: none;
    margin: 0;
    padding: 0;
}

.main-nav {
    position: relative;
}

.mobile-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: var(--white);
    border-top: 1px solid var(--border);
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
    z-index: 1000;
}

.mobile-menu.open {
    display: flex;
    flex-direction: column;
}

.mobile-menu a {
    display: block;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border);
    text-decoration: none;
    color: var(--text);
}

.mobile-menu a:last-child {
    border-bottom: none;
}

/* Desktop */
@media (min-width: 1101px) {

    .top-bar {
        padding: 0.4rem 4rem;
    }

    .top-bar-content {
        flex-direction: row;
        justify-content: flex-end;
        gap: 1rem;
    }

    .top-bar-divider {
        display: inline-block;
        color: var(--muted);
    }

    .top-bar-link[href^="mailto"] {
        display: inline;
    }

    nav {
        padding: 1rem 4rem;
    }

    .logo-img {
        width: 50px;
        height: 50px;
    }

    .logo-text {
        font-size: 1.4rem;
        white-space: nowrap;
    }

    .hamburger {
        display: none;
    }

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

    .nav-links a {
        text-decoration: none;
        color: var(--muted);
        font-size: 0.9rem;
        transition: 0.2s;
    }

    .nav-links a:hover {
        color: var(--accent);
    }

    .nav-cta {
        background: var(--accent);
        color: white !important;
        padding: 0.6rem 1.4rem;
        border-radius: 5px;
        white-space: nowrap;
    }

    .nav-cta:hover {
        background: var(--accent-hover);
    }
}

/* Tablet / mobile (≤768px) */
/* Note: .hamburger visibility is controlled solely by the
   min-width:1101px desktop breakpoint above — not repeated here. */

@media (max-width: 768px) {
    .top-bar { padding: 0.5rem 1rem; }
    .top-bar-content { justify-content: center; flex-wrap: wrap; gap: 0.5rem; }
    .top-bar-divider { margin: 0 0.5rem; }
    .top-bar-link { font-size: 0.8rem; }
    .top-bar-link[href^="mailto"] { display: inline; }

    nav { padding: 1rem 1.5rem; }
    .nav-links { display: none; }

    .logo-text {
        font-size: 0.95rem;
        line-height: 1.1;
    }

    .mobile-menu { top: 57px; }
}