/* ═══════════════════════════════════════════════════════
   HEADER NAV — Shared across all A-Lab pages
   Ensures consistent header background, button sizes,
   and responsive behavior site-wide.
   ═══════════════════════════════════════════════════════ */

/* --- HEADER BAR --- */
header {
    position: fixed !important;
    top: 0 !important;
    left: 0 !important;
    width: 100% !important;
    padding: 20px 40px !important;
    display: flex !important;
    justify-content: space-between !important;
    align-items: center !important;
    z-index: 10000 !important;
    background: var(--bg, #030407) !important;
    border-bottom: 1px solid var(--border, rgba(255,255,255,0.08)) !important;
    backdrop-filter: none !important;
    box-sizing: border-box !important;
    pointer-events: none !important;
}

/* Light theme override */
body.light-theme header {
    background: var(--bg, #f5f5f7) !important;
    border-bottom-color: var(--border, rgba(0,0,0,0.1)) !important;
}

/* --- HEADER CONTROLS CONTAINER --- */
header .header-controls,
header > div[style*="pointer-events"],
header > div:last-child {
    pointer-events: auto !important;
    display: flex !important;
    align-items: center !important;
    gap: 10px !important;
}

/* --- LOGO --- */
header .logo {
    pointer-events: auto !important;
    z-index: 10002 !important;
    position: relative !important;
}

/* --- BACK BUTTON (/// НАЗАД) --- */
header .back-btn {
    pointer-events: auto !important;
    font-family: var(--font-code, 'JetBrains Mono', monospace) !important;
    text-transform: uppercase !important;
    font-size: 0.75rem !important;
    font-weight: 700 !important;
    border: 1px solid var(--border, rgba(255,255,255,0.08)) !important;
    background: rgba(255, 255, 255, 0.05) !important;
    padding: 10px 22px !important;
    border-radius: 50px !important;
    color: white !important;
    text-decoration: none !important;
    cursor: pointer !important;
    transition: all 0.3s ease !important;
    display: inline-flex !important;
    align-items: center !important;
    white-space: nowrap !important;
    line-height: 1 !important;
}

body.light-theme header .back-btn {
    color: #1d1d1f !important;
    background: rgba(0, 0, 0, 0.04) !important;
    border-color: rgba(0, 0, 0, 0.1) !important;
}

header .back-btn:hover {
    border-color: var(--tech-blue, #00E5FF) !important;
    color: var(--tech-blue, #00E5FF) !important;
    box-shadow: 0 0 15px rgba(0, 229, 255, 0.2) !important;
    transform: translateY(-2px) !important;
}

/* --- MENU BUTTON (/// МЕНЮ) --- */
header .menu-btn {
    pointer-events: auto !important;
    font-family: var(--font-code, 'JetBrains Mono', monospace) !important;
    text-transform: uppercase !important;
    font-size: 0.75rem !important;
    font-weight: 700 !important;
    border: 1px solid var(--border, rgba(255,255,255,0.08)) !important;
    background: rgba(255, 255, 255, 0.05) !important;
    padding: 10px 22px !important;
    border-radius: 50px !important;
    color: white !important;
    text-decoration: none !important;
    cursor: pointer !important;
    transition: all 0.3s ease !important;
    display: inline-flex !important;
    align-items: center !important;
    white-space: nowrap !important;
    line-height: 1 !important;
}

body.light-theme header .menu-btn {
    color: #1d1d1f !important;
    background: rgba(0, 0, 0, 0.04) !important;
    border-color: rgba(0, 0, 0, 0.1) !important;
}

header .menu-btn:hover {
    border-color: var(--tech-blue, #00E5FF) !important;
    color: var(--tech-blue, #00E5FF) !important;
    box-shadow: 0 0 15px rgba(0, 229, 255, 0.2) !important;
    transform: translateY(-2px) !important;
}

/* --- THEME TOGGLE BUTTON --- */
header .theme-toggle {
    pointer-events: auto !important;
    background: transparent !important;
    border: 1px solid var(--border, rgba(255,255,255,0.08)) !important;
    color: var(--text, #fff) !important;
    width: 40px !important;
    height: 40px !important;
    border-radius: 50% !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    font-size: 1.2rem !important;
    transition: 0.3s !important;
    cursor: pointer !important;
}

header .theme-toggle:hover {
    border-color: var(--accent, #FF2A2A) !important;
    color: var(--accent, #FF2A2A) !important;
}

/* ═══════════════════════════════════════════════════════
   MOBILE RESPONSIVE
   ═══════════════════════════════════════════════════════ */
@media (max-width: 768px) {
    header {
        padding: 12px 16px !important;
    }

    header .back-btn,
    header .menu-btn {
        font-size: 0.65rem !important;
        padding: 8px 14px !important;
    }

    header .theme-toggle {
        width: 34px !important;
        height: 34px !important;
        font-size: 1rem !important;
    }

    header .logo img {
        height: 28px !important;
    }
}

@media (max-width: 480px) {
    header .back-btn,
    header .menu-btn {
        font-size: 0.6rem !important;
        padding: 7px 12px !important;
    }
}