/* Barra de navegación y pie de página COMPARTIDOS por todo el sitio.
   Se carga en index.html, base.html (categorías, alumnos, exámenes) y admin.html.
   Para cambiar el diseño de la barra o del footer se edita SOLO este archivo
   (y el texto/enlaces en templates/_navbar.html, templates/_footer.html e index.html). */

:root {
    --bg-primary: #0a192f;
    --bg-secondary: #112240;
    --border: #233554;
    --text-main: #e6f1ff;
    --text-muted: #8892b0;
    --accent: #00d2ff;
    --accent-glow: rgba(0, 210, 255, 0.2);
    --nav-h: 72px;
    --border-color: var(--border);
    --bg-card: var(--bg-secondary);
    --highlight: var(--accent);
}

[hidden] { display: none !important; }

.sr-only {
    position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
    overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* Páginas con pie al fondo aunque tengan poco contenido (base.html y admin.html) */
body.pagina { display: flex; flex-direction: column; min-height: 100vh; }
body.pagina > main,
body.pagina > .main-container,
body.pagina > .top { width: 100%; }
body.pagina > .site-footer { margin-top: auto; }

/* ---------- Navbar ---------- */
.navbar, .site-footer {
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.5;
    color: var(--text-main);
}
.navbar *, .site-footer * { box-sizing: border-box; margin: 0; padding: 0; }
.navbar { box-sizing: border-box; }

.navbar {
    position: sticky;
    top: 0;
    z-index: 50;
    height: var(--nav-h);
    flex-shrink: 0;
    background-color: rgba(10, 25, 47, 0.85);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
}

.nav-inner {
    max-width: 1100px;
    height: 100%;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: inherit;
    flex-shrink: 0;
}

.avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--border);
    background-color: var(--bg-secondary);
}

.avatar-fallback {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: none;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-secondary);
    border: 2px solid var(--accent);
    color: var(--accent);
    font-weight: 700;
    font-size: 0.9rem;
}

.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-text strong { font-size: 1rem; }
.brand-text span { font-size: 0.75rem; color: var(--text-muted); }

.nav-menu {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    list-style: none;
}

.nav-menu a {
    display: block;
    padding: 0.5rem 0.8rem;
    border-radius: 8px;
    text-decoration: none;
    color: var(--text-muted);
    font-size: 0.92rem;
    font-weight: 500;
    white-space: nowrap;
    transition: color 0.2s, background-color 0.2s;
}

.nav-menu a:hover,
.nav-menu a[aria-current="page"] {
    color: var(--text-main);
    background-color: rgba(35, 53, 84, 0.6);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    flex-shrink: 0;
}

.navbar .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.6rem 1.1rem;
    border-radius: 8px;
    font-size: 0.92rem;
    font-weight: 600;
    line-height: 1.5;
    cursor: pointer;
    border: 1px solid transparent;
    text-decoration: none;
    transition: all 0.2s;
    font-family: inherit;
    white-space: nowrap;
    min-height: 0;
}
.navbar .btn svg { width: 18px; height: 18px; flex-shrink: 0; }

.navbar .btn-primary { background-color: var(--accent); color: var(--bg-primary); }
.navbar .btn-primary:hover { box-shadow: 0 0 0 4px var(--accent-glow); transform: translateY(-1px); }

.navbar .btn-login { background-color: transparent; color: var(--text-main); border-color: var(--border); }
.navbar .btn-login:hover { border-color: var(--text-muted); }
.navbar .btn-login.is-logged { border-color: var(--accent); color: var(--accent); }
.navbar .btn-login .label { max-width: 12ch; overflow: hidden; text-overflow: ellipsis; }

.navbar .menu-toggle {
    display: none;
    background: none;
    border: 1px solid var(--border);
    color: var(--text-main);
    border-radius: 8px;
    width: 42px;
    height: 42px;
    cursor: pointer;
    align-items: center;
    justify-content: center;
}
.navbar .menu-toggle svg { width: 22px; height: 22px; }

.navbar a:focus-visible,
.navbar button:focus-visible,
.site-footer a:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 6px; }

/* ---------- Footer ---------- */
.site-footer {
    border-top: 1px solid var(--border);
    color: var(--text-muted);
}

.footer-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 2.5rem 1.5rem;
    display: flex;
    flex-direction: row-reverse; /* íconos a la derecha, texto a la izquierda */
    justify-content: space-between;
    align-items: flex-start;
}

.footer-text {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    align-items: flex-start;
    text-align: left;
}

.footer-profesor {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.footer-info {
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.contact-links { display: flex; gap: 1.25rem; }

.contact-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    transition: color 0.2s ease, border-color 0.2s ease;
}
.contact-icon:hover { color: var(--text-main); border-color: var(--highlight); }
.contact-icon svg { width: 18px; height: 18px; fill: currentColor; }

/* ---------- Responsive ---------- */
/* Tablet y teléfono: menú hamburguesa */
@media (max-width: 1180px) {
    .navbar .menu-toggle { display: inline-flex; }

    .brand { min-width: 0; flex-shrink: 1; }
    .brand-text { min-width: 0; }
    .brand-text strong {
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    .nav-menu {
        position: absolute;
        top: var(--nav-h);
        left: 0;
        right: 0;
        flex-direction: column;
        align-items: stretch;
        gap: 0.25rem;
        padding: 1rem 1.5rem 1.5rem;
        background-color: var(--bg-primary);
        border-bottom: 1px solid var(--border);
        box-shadow: 0 24px 40px rgba(0, 0, 0, 0.45);
        max-height: calc(100vh - var(--nav-h));
        max-height: calc(100dvh - var(--nav-h));
        overflow-y: auto;
        overscroll-behavior: contain;
        display: none;
    }
    .nav-menu.open { display: flex; }
    .nav-menu li { width: 100%; }
    .nav-menu a { padding: 0.9rem 1rem; font-size: 1rem; }

    .nav-actions .btn-upload-nav .label { display: none; }
    .nav-actions .btn-upload-nav { padding: 0.6rem; }

    /* Botones táctiles de 44px */
    .nav-actions .btn,
    .navbar .menu-toggle { min-width: 44px; min-height: 44px; }
}

@media (max-width: 700px) {
    .brand-text span { display: none; }
    .navbar .btn-login .label { display: none; }
    .navbar .btn-login { padding: 0.6rem; }
    .nav-inner { gap: 0.75rem; }
}

@media (max-width: 520px) {
    .nav-inner { padding: 0 1rem; }
    .nav-actions { gap: 0.4rem; }
    .nav-menu { padding: 0.75rem 1rem 1.25rem; }

    .footer-inner {
        flex-direction: column;
        align-items: center;
        gap: 1.25rem;
        padding: 2rem 1rem;
    }
    .contact-links { justify-content: center; }
    .footer-text { align-items: center; text-align: center; }
    .footer-profesor { font-size: 0.8rem; }
    .footer-info { font-size: 0.72rem; }
}

@media (max-width: 400px) {
    .brand-text { display: none; }
}

@media (prefers-reduced-motion: reduce) {
    .navbar *, .site-footer * { transition: none !important; }
}