/* ============================================================
   Navigation — Druid Learning Hub
   Top nav, mobile sidebar, command palette, avatar dropdown.
   ============================================================ */

/* ---- Top Nav ---- */
.site-nav {
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    display: flex;
    align-items: center;
    height: var(--nav-height);
    padding: 0 var(--space-4);
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    transition: box-shadow var(--transition-base);
}
.site-nav--scrolled {
    box-shadow: var(--shadow-sm);
}

/* Logo */
.site-nav__logo a {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-family: var(--font-heading);
    font-weight: var(--font-bold);
    font-size: var(--text-lg);
    color: var(--color-text);
}
.site-nav__logo a:hover { color: var(--color-text); }
.site-nav__logo-icon {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary);
    border-radius: var(--radius-md);
    color: #FFF;
}
.site-nav__logo-icon .material-symbols-outlined { font-size: 20px; }

/* Center links */
.site-nav__links {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    margin-left: var(--space-8);
    flex: 1;
}
.site-nav__link {
    padding: 6px 12px;
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--color-text-secondary);
    border-radius: var(--radius-md);
    transition: color var(--transition-fast), background var(--transition-fast);
    white-space: nowrap;
}
.site-nav__link:hover {
    color: var(--color-text);
    background: var(--color-bg-tertiary);
}
.site-nav__link--active {
    color: var(--color-primary);
    background: var(--color-primary-light);
}

/* Right section */
.site-nav__right {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

/* Search button */
.nav-search-btn {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: 6px 12px;
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: border-color var(--transition-fast);
}
.nav-search-btn:hover { border-color: var(--color-border-strong); }
.nav-search-btn .material-symbols-outlined { font-size: 18px; }
.nav-search-btn kbd {
    margin-left: var(--space-2);
}

/* Theme toggle */
.nav-theme-toggle {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    transition: background var(--transition-fast);
}
.nav-theme-toggle:hover { background: var(--color-bg-tertiary); }
.theme-icon-dark { display: none; }
[data-theme="dark"] .theme-icon-light { display: none; }
[data-theme="dark"] .theme-icon-dark { display: inline; }
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) .theme-icon-light { display: none; }
    :root:not([data-theme="light"]) .theme-icon-dark { display: inline; }
}

/* Bell */
.nav-bell {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    transition: background var(--transition-fast);
}
.nav-bell:hover { background: var(--color-bg-tertiary); }

/* Streak & XP */
.nav-streak, .nav-xp {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    padding: 4px 8px;
    border-radius: var(--radius-full);
}
.nav-streak {
    color: var(--color-streak);
    background: rgba(239, 68, 68, 0.1);
}
.nav-streak .material-symbols-outlined { font-size: 18px; }
.nav-xp {
    color: var(--color-xp);
    background: rgba(245, 158, 11, 0.1);
}
.nav-xp .material-symbols-outlined { font-size: 18px; }

/* Avatar */
.nav-avatar-wrap {
    position: relative;
}
.nav-avatar {
    width: 34px;
    height: 34px;
    border-radius: var(--radius-full);
    background: var(--color-primary);
    color: #FFF;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--font-bold);
    font-size: var(--text-sm);
    cursor: pointer;
    transition: box-shadow var(--transition-fast);
}
.nav-avatar:hover { box-shadow: 0 0 0 2px var(--color-primary-200); }

/* Avatar Dropdown */
.avatar-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    width: 240px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-4px);
    transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
    z-index: var(--z-dropdown);
}
.avatar-dropdown.open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.avatar-dropdown__header {
    padding: var(--space-3) var(--space-4);
    border-bottom: 1px solid var(--color-border);
}
.avatar-dropdown__name {
    font-weight: var(--font-semibold);
    font-size: var(--text-sm);
}
.avatar-dropdown__email {
    font-size: var(--text-xs);
    color: var(--color-text-tertiary);
}
.avatar-dropdown__item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-sm);
    color: var(--color-text);
    transition: background var(--transition-fast);
}
.avatar-dropdown__item:hover {
    background: var(--color-bg-tertiary);
    color: var(--color-text);
}
.avatar-dropdown__item .material-symbols-outlined { font-size: 18px; color: var(--color-text-secondary); }
.avatar-dropdown__item--danger { color: var(--color-error); }
.avatar-dropdown__item--danger:hover { background: var(--color-error-light); color: var(--color-error); }
.avatar-dropdown__item--danger .material-symbols-outlined { color: var(--color-error); }
.avatar-dropdown__divider {
    height: 1px;
    background: var(--color-border);
    margin: var(--space-1) 0;
}

/* Auth buttons (logged out) */
.nav-auth {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

/* Mobile toggle */
.site-nav__toggle {
    display: none;
    width: 36px;
    height: 36px;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
}

/* ---- Mobile Nav Sidebar ---- */
.mobile-nav-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: var(--z-overlay);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), visibility var(--transition-base);
}
.mobile-nav-overlay.open { opacity: 1; visibility: visible; }

.mobile-nav {
    position: fixed;
    top: 0;
    right: 0;
    width: min(320px, 85vw);
    height: 100%;
    background: var(--color-surface);
    z-index: calc(var(--z-overlay) + 1);
    transform: translateX(100%);
    transition: transform var(--transition-slow);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}
.mobile-nav.open { transform: translateX(0); }

.mobile-nav__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4);
    border-bottom: 1px solid var(--color-border);
}
.mobile-nav__close {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
}

.mobile-nav__profile {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-4);
    border-bottom: 1px solid var(--color-border);
}
.mobile-nav__avatar {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: var(--color-primary);
    color: #FFF;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--font-bold);
}
.mobile-nav__name { font-weight: var(--font-semibold); font-size: var(--text-sm); }
.mobile-nav__role { font-size: var(--text-xs); color: var(--color-text-secondary); }

.mobile-nav__gamify {
    display: flex;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    border-bottom: 1px solid var(--color-border);
}

.mobile-nav__links {
    flex: 1;
    padding: var(--space-2) 0;
}
.mobile-nav__link {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--color-text-secondary);
    transition: background var(--transition-fast), color var(--transition-fast);
}
.mobile-nav__link:hover,
.mobile-nav__link--active {
    background: var(--color-primary-light);
    color: var(--color-primary);
}
.mobile-nav__link .material-symbols-outlined { font-size: 20px; }

.mobile-nav__footer {
    border-top: 1px solid var(--color-border);
    padding: var(--space-2) 0;
}

/* ---- Command Palette ---- */
.cmd-palette-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: var(--z-modal);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-fast), visibility var(--transition-fast);
}
.cmd-palette-backdrop.open { opacity: 1; visibility: visible; }

.cmd-palette {
    position: fixed;
    top: 20%;
    left: 50%;
    transform: translateX(-50%) translateY(-8px);
    width: min(560px, 90vw);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    z-index: calc(var(--z-modal) + 1);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
}
.cmd-palette.open {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.cmd-palette__input-wrap {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    border-bottom: 1px solid var(--color-border);
}
.cmd-palette__input-wrap .material-symbols-outlined {
    font-size: 20px;
    color: var(--color-text-tertiary);
}
.cmd-palette__input {
    flex: 1;
    border: none;
    background: none;
    font-size: var(--text-base);
    outline: none;
    color: var(--color-text);
}

.cmd-palette__results {
    max-height: 320px;
    overflow-y: auto;
    padding: var(--space-2);
}
.cmd-palette__group-label {
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: var(--space-2) var(--space-3);
}
.cmd-palette__item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2) var(--space-3);
    font-size: var(--text-sm);
    color: var(--color-text);
    border-radius: var(--radius-md);
    transition: background var(--transition-fast);
}
.cmd-palette__item:hover {
    background: var(--color-primary-light);
    color: var(--color-primary);
}
.cmd-palette__item .material-symbols-outlined { font-size: 18px; color: var(--color-text-secondary); }

.cmd-palette__footer {
    display: flex;
    gap: var(--space-4);
    padding: var(--space-2) var(--space-4);
    border-top: 1px solid var(--color-border);
    font-size: var(--text-xs);
    color: var(--color-text-tertiary);
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
    .site-nav__links { display: none; }
    .nav-search-btn span:not(.material-symbols-outlined),
    .nav-search-btn kbd { display: none; }
    .nav-search-btn { padding: 6px; }
    .nav-streak, .nav-xp { display: none; }
    .nav-auth .site-nav__link { display: none; }
    .site-nav__toggle { display: flex; }
}