/**
 * Navigation bar styles.
 *
 * Laid out the way YouTube does it: the brand sits on the left, the search box
 * takes all the space in the middle, and the account actions are pushed to the
 * right edge. The bar is flat (the same colour as the page) rather than a raised
 * card, and every hover is a soft circular wash instead of a filled button.
 */

.navbar {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--yt-border);
    padding: 0 16px;
    height: 56px;
    display: flex;
    align-items: center;
    gap: 8px;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: -0.02em;
    padding: 4px 6px 4px 2px;
    border-radius: var(--radius-sm);
    flex: none;
}

.navbar-brand:focus-visible {
    outline: 2px solid var(--accent-red);
    outline-offset: 2px;
}

/* The rounded red square behind the play glyph, as on the YouTube wordmark. */
.brand-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 30px;
    height: 30px;
    background: var(--accent-red);
    color: #fff;
    border-radius: 8px;
    font-size: 0.85rem;
    padding-left: 2px;
}

.navbar-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    /* Take the remaining width so the search can stretch and the real actions
       end up pinned to the right edge, exactly like YouTube's bar. */
    flex: 1;
    justify-content: flex-end;
    min-width: 0;
}

.navbar-nav {
    display: flex;
    align-items: center;
    gap: 4px;
    list-style: none;
    flex: none;
}

/* --- Language switcher --------------------------------------------------- */

.language-form {
    display: flex;
    flex: none;
}

.lang-toggle {
    display: flex;
    align-items: center;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    padding: 2px;
    gap: 2px;
}

.lang-option {
    border: none;
    background: none;
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.03em;
    padding: 5px 9px;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.lang-option:hover {
    color: var(--text-primary);
}

.lang-option.active {
    background: var(--accent-red);
    color: #fff;
}

/* --- Theme toggle -------------------------------------------------------- */

.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: none;
    background: transparent;
    color: var(--text-primary);
    cursor: pointer;
    font-size: 1rem;
    line-height: 1;
    transition: background var(--transition-fast);
    flex: none;
}

.theme-toggle:hover {
    background: var(--yt-hover);
}

.theme-icon-sun {
    display: none;
}

[data-theme="light"] .theme-icon-sun {
    display: inline;
}

[data-theme="light"] .theme-icon-moon {
    display: none;
}

/* --- Links --------------------------------------------------------------- */

.nav-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--text-primary);
    text-decoration: none;
    padding: 8px 14px;
    border-radius: var(--radius-full);
    font-weight: 500;
    font-size: 0.9rem;
    white-space: nowrap;
    transition: background var(--transition-fast), color var(--transition-fast);
}

.nav-link:hover {
    background: var(--yt-hover);
}

.nav-link.btn-primary {
    background: var(--accent-red);
    color: #fff;
}

.nav-link.btn-primary:hover {
    background: var(--accent-red-hover);
}

.nav-link.btn-outline {
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.nav-link.btn-outline:hover {
    background: var(--yt-hover);
    border-color: var(--text-secondary);
}

/* "Upload" behaves like YouTube's Create pill: a filled chip. */
.btn-upload {
    background: var(--yt-chip);
    color: var(--text-primary);
}

.btn-upload:hover {
    background: var(--yt-chip-hover);
}

.logout-form {
    display: inline-flex;
}

.logout-btn {
    background: none;
    cursor: pointer;
    font-family: inherit;
    font-size: inherit;
}

.nav-username {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    background: var(--accent-red);
    font-weight: 600;
    font-size: 0.95rem;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    text-transform: uppercase;
    flex: none;
}

/* --- Hamburger (hidden on desktop) --------------------------------------- */

.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    padding: 10px;
    background: transparent;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    flex: none;
}

.nav-toggle:hover {
    background: var(--yt-hover);
}

.nav-toggle-bar {
    display: block;
    width: 100%;
    height: 2px;
    border-radius: 2px;
    background: var(--text-primary);
    transition: transform var(--transition-normal), opacity var(--transition-normal);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
    opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ------------------------------------------------------------------ */
/* Mobile / small tablet: the actions collapse into a dropdown panel.  */
/* The search box is the first thing in that panel, as on the YouTube   */
/* phone layout where the bar holds only the logo and a magnifier.      */
/* ------------------------------------------------------------------ */

@media (max-width: 768px) {
    .navbar {
        padding: 0 12px;
    }

    .nav-toggle {
        display: flex;
    }

    .navbar-brand {
        margin-right: auto;
    }

    .navbar-actions {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        display: none;
        flex-direction: column;
        align-items: stretch;
        gap: 14px;
        padding: 16px;
        background: var(--bg-secondary);
        border-bottom: 1px solid var(--yt-border);
        box-shadow: var(--shadow-lg);
        max-height: calc(100vh - 56px);
        overflow-y: auto;
    }

    .navbar-actions.open {
        display: flex;
    }

    .navbar-nav {
        flex-direction: column;
        align-items: stretch;
        gap: 4px;
        width: 100%;
    }

    .navbar-nav li {
        width: 100%;
    }

    .nav-link,
    .nav-username {
        display: flex;
        justify-content: center;
        text-align: center;
        padding: 12px 16px;
    }

    .nav-username {
        width: 100%;
        height: auto;
        border-radius: var(--radius-md);
        background: var(--bg-tertiary);
        color: var(--text-primary);
        text-transform: none;
    }

    .logout-form {
        display: block;
        width: 100%;
    }

    .logout-btn {
        width: 100%;
    }

    .lang-toggle {
        align-self: center;
    }

    .language-form {
        justify-content: center;
    }

    .theme-toggle {
        align-self: center;
    }
}