/* ==========================================================================
   Chess It Out -- off-canvas navigation
   ==========================================================================
   Replaces the old fixed `nav-container` top bar.

   Deliberately off-canvas rather than a top bar: the game views are a
   height:100vh grid whose board sizing derives from --board_size. A floating
   burger plus a drawer adds nothing to the document flow, so the board maths
   is untouched and the same navigation works on every page.
   ========================================================================== */

/* ------------------------------------------------------------- burger --- */

.burger {
    position: fixed;
    top: var(--burger-inset);
    left: var(--burger-inset);
    z-index: var(--z-burger);

    display: inline-flex;
    align-items: center;
    justify-content: center;

    width: var(--burger-size);
    height: var(--burger-size);
    padding: 0;

    color: var(--text);
    background-color: color-mix(in srgb, var(--surface-1) 82%, transparent);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    backdrop-filter: blur(8px);
    cursor: pointer;

    transition: background-color var(--transition), border-color var(--transition),
                color var(--transition);
}

.burger:hover {
    background-color: var(--surface-2);
    border-color: var(--border-strong);
}

.burger:focus-visible {
    box-shadow: var(--ring);
}

/* While the drawer is open it would sit on top of the drawer's own logo, and
   the drawer has its own close button. */
body.sidebar-open .burger {
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition);
}

.burger .icon {
    width: 1.5rem;
    height: 1.5rem;
}

/* -------------------------------------------------------------- scrim --- */

.sidebar-scrim {
    position: fixed;
    inset: 0;
    z-index: var(--z-scrim);
    background-color: var(--scrim);
    backdrop-filter: blur(2px);

    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition), visibility var(--transition);
}

body.sidebar-open .sidebar-scrim {
    opacity: 1;
    visibility: visible;
}

/* ------------------------------------------------------------ sidebar --- */

.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: var(--z-sidebar);

    display: flex;
    flex-direction: column;
    width: var(--sidebar-width);
    max-width: 100vw;

    background-color: var(--surface-1);
    border-right: 1px solid var(--border);
    box-shadow: var(--shadow-lg);

    transform: translateX(-100%);
    visibility: hidden;
    transition: transform var(--transition-slow), visibility var(--transition-slow);

    /* This drawer is the one thing on the page that is allowed to scroll --
       see the `#container_all *` override in game_base.css. */
    overflow-y: auto;
    overscroll-behavior: contain;
}

body.sidebar-open .sidebar {
    transform: translateX(0);
    visibility: visible;
}

@media (prefers-reduced-motion: reduce) {
    .sidebar {
        transition: visibility 0s;
    }
}

/* Header ------------------------------------------------------------------ */

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    border-bottom: 1px solid var(--border);
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    color: var(--text);
    text-decoration: none;
    min-width: 0;
}

.sidebar-brand:hover {
    color: var(--text);
    text-decoration: none;
}

.sidebar-brand img {
    width: 2.25rem;
    height: 2.25rem;
    object-fit: contain;
    flex: none;
}

.sidebar-brand-text {
    font-size: var(--fs-lg);
    font-weight: var(--fw-semibold);
    line-height: var(--lh-tight);
    letter-spacing: -0.01em;
    color: var(--accent);
}

.sidebar-brand-sub {
    display: block;
    font-size: var(--fs-xs);
    font-weight: var(--fw-medium);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-faint);
}

.sidebar-close {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.25rem;
    height: 2.25rem;
    flex: none;
    padding: 0;
    color: var(--text-muted);
    background: none;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background-color var(--transition), color var(--transition);
}

.sidebar-close:hover {
    background-color: var(--surface-2);
    color: var(--text);
}

.sidebar-close:focus-visible {
    box-shadow: var(--ring);
}

/* Account block ----------------------------------------------------------- */

.sidebar-account {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    padding: var(--space-4);
    border-bottom: 1px solid var(--border);
}

.sidebar-identity {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    min-width: 0;
}

.sidebar-avatar {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    flex: none;
    font-size: var(--fs-md);
    font-weight: var(--fw-bold);
    text-transform: uppercase;
    color: var(--text-on-brand);
    background-color: var(--brand);
    border-radius: var(--radius-full);
}

.sidebar-identity-text {
    min-width: 0;
}

.sidebar-username {
    display: block;
    font-size: var(--fs-md);
    font-weight: var(--fw-semibold);
    line-height: var(--lh-tight);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.sidebar-rating {
    display: flex;
    align-items: baseline;
    gap: var(--space-2);
    font-size: var(--fs-sm);
    color: var(--text-muted);
    font-variant-numeric: tabular-nums;
}

.sidebar-rating strong {
    font-size: var(--fs-lg);
    font-weight: var(--fw-bold);
    color: var(--accent);
}

.rating-delta-up { color: var(--success); }
.rating-delta-down { color: var(--danger); }

/* Navigation -------------------------------------------------------------- */

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
    padding: var(--space-4);
}

.sidebar-section-title {
    padding: 0 var(--space-3) var(--space-2);
    font-size: var(--fs-xs);
    font-weight: var(--fw-semibold);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-faint);
}

/* Wie ein Sidebar-Eintrag, nur mit dem Haken rechts aussen. */
.sidebar-setting {
    justify-content: space-between;
}

.sidebar-setting input[type="checkbox"] {
    appearance: none;
    -webkit-appearance: none;
    width: 1.25rem;
    height: 1.25rem;
    margin: 0;
    flex: none;

    border: 2px solid var(--border-strong);
    border-radius: var(--radius-sm);
    background-color: transparent;
    background-position: center;
    background-repeat: no-repeat;
    background-size: 80%;
    cursor: pointer;
    transition: background-color var(--transition), border-color var(--transition);
}

.sidebar-setting input[type="checkbox"]:checked {
    background-color: var(--accent);
    border-color: var(--accent);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23131518' stroke-width='3.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'/%3E%3C/svg%3E");
}

.sidebar-setting input[type="checkbox"]:focus-visible {
    box-shadow: var(--ring);
}

.sidebar-setting span {
    flex: 1;
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    width: 100%;

    min-height: 2.75rem;
    padding: 0 var(--space-3);

    font-family: var(--font-ui);
    font-size: var(--fs-md);
    font-weight: var(--fw-medium);
    text-align: left;
    color: var(--text);

    background: none;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background-color var(--transition), color var(--transition);
}

.sidebar-link:hover {
    background-color: var(--surface-2);
    color: var(--text);
    text-decoration: none;
}

.sidebar-link:focus-visible {
    box-shadow: var(--ring);
}

.sidebar-link .icon {
    color: var(--text-faint);
}

.sidebar-link:hover .icon {
    color: var(--accent);
}

.sidebar-link.is-active {
    background-color: var(--brand-soft);
    color: var(--text);
}

.sidebar-link.is-active .icon {
    color: var(--accent);
}

.sidebar-link:disabled,
.sidebar-link.is-disabled {
    opacity: 0.45;
    cursor: not-allowed;
    pointer-events: none;
}

.sidebar-link-hint {
    margin-left: auto;
    font-size: var(--fs-xs);
    color: var(--text-faint);
}

.sidebar-divider {
    height: 1px;
    margin: var(--space-2) 0;
    background-color: var(--border);
    border: none;
}

/* Footer ------------------------------------------------------------------ */

.sidebar-footer {
    margin-top: auto;
    padding: var(--space-4);
    border-top: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.sidebar-share {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.sidebar-note {
    font-size: var(--fs-xs);
    line-height: var(--lh-normal);
    color: var(--text-faint);
}

/* ------------------------------------------------------------ narrow ----- */

@media (max-width: 480px) {
    .sidebar {
        width: 100vw;
        border-right: none;
    }
}