/* ── App Nav (top bar, desktop ≥768px) ───────────────────── */
.app-nav {
    display: flex;
    align-items: center;
    gap: 0;
    padding: 24px 16px;
    border-bottom: 0.5px solid var(--border);
    background: var(--bg);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    width: 100%;
    box-sizing: border-box;
    z-index: 200;
}

.app-nav-brand {
    flex: 0 0 auto;
    display: flex;
    align-items: center;
    gap: 8px;
    margin-right: 20px;
}

.nav-logo {
    height: 26px;
    width: auto;
    display: block;
    flex-shrink: 0;
}

.app-nav-title {
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: 2px;
    color: var(--fg);
    text-transform: uppercase;
}

.app-nav-tabs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    flex: 0 0 auto;
    border: 1px solid var(--border-3);
    border-radius: 6px;
    overflow: hidden;
    position: relative;
}

/* Sliding active background — starts left (aerodrome), slides right (area) */
.app-nav-tabs::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 50%;
    height: 100%;
    background: var(--fg);
    transition: transform 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 0;
    pointer-events: none;
}

.app-nav-tabs:has(#nav-tab-area.active)::before {
    transform: translateX(100%);
}

.app-nav-tab {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 6px 14px;
    border: none;
    background: transparent;
    color: var(--fg-2);
    font-family: inherit;
    font-size: 0.76rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    cursor: pointer;
    transition: color 0.28s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.15s ease;
    height: 35px;
    position: relative;
    z-index: 1;
    white-space: nowrap;
}

.app-nav-tab:not(.active):hover {
    box-shadow: inset 0 -2px 0 var(--fg);
}

.app-nav-tab.active {
    color: var(--bg);
}

.nav-tab-label {
    font-size: 0.76rem;
    font-weight: 700;
    letter-spacing: 0.07rem;
    margin-left:4px;
}

.app-nav-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-left: auto;
}

/* Clean icon buttons — override old bordered/stretching styles */
.app-nav-actions button {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 35px;
    padding: 0;
    background: transparent;
    border: none;
    border-radius: 6px;
    color: var(--fg-2);
    cursor: pointer;
    align-self: auto;
    transition: background 0.08s, color 0.08s;
    flex-shrink: 0;
    border: 1px solid var(--border-2);
}

.app-nav-actions button:hover {
     background: var(--fg);
    color: var(--bg);
    border-color: transparent;
    opacity: 1;
}

.app-nav-actions .pdf-export-btn {
    background:none;
    width: auto;
    padding: 0 10px;
    gap: 6px;
    color: var(var(--fg-1));
    font-family: inherit;
    font-size: 0.76rem;
    font-weight: 700;
    letter-spacing: 0.05em;
}

.app-nav-actions .pdf-export-btn:hover {
    background: var(--fg);
    color: var(--bg);
    opacity: 1;
}

.lang-btn .lang-label {
    font-size: 0.76rem;
    font-weight: 700;
    letter-spacing: 0.07em;
}

/* ── Info below search ───────────────────────────────────── */
.info-below-search {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    margin-top: 0;
    transition: opacity 0.15s;
    position: fixed;
    bottom: 16px;
    left: 0;
    right: 0;
    z-index: 150;
}

.info-below-engine {
    color: var(--fg-3);
    font-family: inherit;
    font-size: 0.55rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

#main-container.has-route .info-below-search,
#main-container.mode-area .info-below-search {
    display: none;
}

.info-below-btn {
    display: flex;
    align-items: center;
    gap: 5px;
    background: none;
    border: none;
    color: var(--fg-3);
    font-family: inherit;
    font-size: 0.75rem;
    cursor: pointer;
    padding: 5px 10px;
    border-radius: 6px;
    transition: color 0.15s;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.info-below-btn:hover {
    color: var(--fg);
}

/* ── Bottom Nav (mobile <768px) ──────────────────────────── */
.bottom-nav {
    display: none; /* shown via media query */
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 50px;
    background: var(--bg);
    border-top: 1px solid var(--border);
    z-index: 200;
    justify-content: space-around;
    align-items: stretch;
    overflow: hidden;
}

/* Sliding active background — starts left (aerodrome), slides right (area) */
.bottom-nav::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 50%;
    height: 100%;
    background: var(--fg);
    transition: transform 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 0;
    pointer-events: none;
}

.bottom-nav:has(#bottom-tab-area.active)::before {
    transform: translateX(100%);
}

.bottom-nav-tab {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 3px;
    border: none;
    background: transparent;
    color: var(--fg-3);
    font-family: inherit;
    font-size: 0.65rem;
    cursor: pointer;
    transition: color 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    padding-bottom: env(safe-area-inset-bottom, 0);
    position: relative;
    z-index: 1;
}

.bottom-nav-tab.active {
    color: var(--bg);
    font-weight: 600;
}

.bottom-nav-tab.active .nav-aerodrome-icon {
    filter: invert(1);
}

[data-theme="sunset"] .bottom-nav-tab.active .nav-aerodrome-icon,
[data-theme="day"] .bottom-nav-tab.active .nav-aerodrome-icon {
    filter: none;
}

.bottom-nav-tab svg {
    flex-shrink: 0;
}

.nav-aerodrome-icon {
    flex-shrink: 0;
    display: block;
    transition: filter 0s 0.05s; /* leaving active: pill departs from left quickly */
}

[data-theme="sunset"] .nav-aerodrome-icon,
[data-theme="day"] .nav-aerodrome-icon {
    filter: invert(1);
}

/* Active tab sits on dark pill — invert icon to stay readable */
.app-nav-tab.active .nav-aerodrome-icon {
    filter: invert(1);
    transition: filter 0s 0.18s; /* entering active: pill travels full width from right */
}

[data-theme="sunset"] .app-nav-tab.active .nav-aerodrome-icon,
[data-theme="day"] .app-nav-tab.active .nav-aerodrome-icon {
    filter: none;
}

[data-theme="sunset"] .nav-logo,
[data-theme="day"] .nav-logo {
    filter: invert(1);
}

@media (max-width: 767px) {
    .app-nav {
        padding: 15px 16px;
        transition: padding 0.28s ease;
    }

    .app-nav-tabs { display: none; }

    .nav-logo {
        transition: height 0.28s ease;
    }

    .app-nav-title {
        transition: font-size 0.28s ease;
    }

    .bottom-nav { display: flex; }
    .mode-layer { padding-bottom: calc(56px + env(safe-area-inset-bottom, 0)); }

    .info-below-search {
        position: fixed;
        bottom: calc(50px + env(safe-area-inset-bottom, 0));
        left: 0;
        right: 0;
        z-index: 150;
        margin-top: 0;
        background: transparent;
        pointer-events: auto;
        padding:10px 0;
    }

    #main-container.has-route .info-below-search,
    #main-container.mode-area .info-below-search {
        display: none;
    }

    /* ── Collapsed state (JS adds .nav-scrolled) ── */
    .app-nav.nav-scrolled {
        padding: 8px 16px;
    }

    .app-nav.nav-scrolled .nav-logo {
        height: 18px;
    }

    .app-nav.nav-scrolled .app-nav-title {
        font-size: 0.85rem;
    }
}