/* Phase 1 – Desktop-Grundlayout mit einklappbarer Seitenleiste */

.app-shell {
    min-height: 100vh;

    display: grid;
    grid-template-columns:
        var(--sidebar-width)
        minmax(0, 1fr);

    transition: grid-template-columns 180ms ease;
}

.app-sidebar {
    position: sticky;
    z-index: 20;
    top: 0;

    min-width: 0;
    height: 100vh;

    display: flex;
    flex-direction: column;

    border-right: 1px solid var(--sidebar-border);

    background:
        linear-gradient(
            180deg,
            color-mix(
                in srgb,
                var(--sidebar-accent) 5%,
                transparent
            ),
            transparent 18rem
        ),
        var(--sidebar-background);
    color: var(--sidebar-text);

    box-shadow: var(--shadow-soft);
    overflow: hidden;
}

.app-main {
    min-width: 0;
}

.app-authenticated .main-content {
    width: min(
        calc(100% - 3rem),
        var(--max-width)
    );

    padding-block: 3rem 5rem;
}

.auth-main-content {
    padding-block: 3rem 5rem;
}

.sidebar-header {
    flex: 0 0 auto;

    border-bottom: 1px solid var(--sidebar-border);
    padding: 1rem;
}

.sidebar-brand-row {
    min-height: 3.25rem;

    display: flex;
    align-items: center;
    gap: 0.65rem;
}

.sidebar-brand {
    min-width: 0;
    flex: 1 1 auto;

    display: flex;
    align-items: center;
    gap: 0.8rem;

    color: var(--sidebar-text);

    font-family:
        Georgia,
        "Times New Roman",
        serif;
    font-size: 1.12rem;
    font-weight: 700;
    line-height: 1.02;
    text-decoration: none;
}

.sidebar-brand-mark {
    width: 2.4rem;
    height: 2.4rem;
    flex: 0 0 auto;

    display: grid;
    place-items: center;

    border: 1px solid var(--sidebar-border);
    border-radius: 50%;

    background: var(--sidebar-surface);
    color: var(--sidebar-accent);
}

.sidebar-brand-mark .sidebar-icon {
    width: 1.45rem;
    height: 1.45rem;
}

.sidebar-brand-copy {
    overflow: hidden;

    white-space: nowrap;
}

.sidebar-collapse-toggle {
    width: 2.3rem;
    height: 2.3rem;
    flex: 0 0 auto;

    display: grid;
    place-items: center;

    margin: 0;
    border: 1px solid var(--sidebar-border);
    border-radius: 50%;
    padding: 0;

    background: var(--sidebar-surface);
    color: var(--sidebar-muted);

    transition:
        border-color 140ms ease,
        color 140ms ease,
        transform 140ms ease;
}

.sidebar-collapse-toggle:hover {
    border-color: var(--sidebar-accent);
    color: var(--sidebar-accent);
}

.sidebar-collapse-toggle:focus-visible,
.sidebar-link:focus-visible,
.sidebar-user-link:focus-visible,
.sidebar-user-action:focus-visible,
.sidebar-footer-action:focus-visible,
.sidebar-subnavigation a:focus-visible {
    outline: 2px solid var(--sidebar-accent);
    outline-offset: 2px;
}

.sidebar-collapse-icon {
    width: 1.15rem;
    height: 1.15rem;

    fill: none;
    stroke: currentColor;
    stroke-width: 1.8;
    stroke-linecap: round;
    stroke-linejoin: round;

    transition: transform 180ms ease;
}

.sidebar-user-panel {
    display: grid;
    gap: 0.5rem;

    margin-top: 1rem;
}

.sidebar-user-link,
.sidebar-user-action {
    width: 100%;
    min-width: 0;

    display: grid;
    grid-template-columns: 2.2rem minmax(0, 1fr);
    align-items: center;
    gap: 0.7rem;

    border: 1px solid transparent;
    border-radius: 0.8rem;
    padding: 0.55rem;

    background: transparent;
    color: var(--sidebar-text);

    text-align: left;
    text-decoration: none;

    transition:
        background-color 140ms ease,
        border-color 140ms ease,
        color 140ms ease;
}

.sidebar-user-link:hover,
.sidebar-user-action:hover,
.sidebar-user-link.is-current,
.sidebar-user-action[aria-pressed="true"] {
    border-color: var(--sidebar-border);
    background: var(--sidebar-surface);
}

.sidebar-user-action[aria-pressed="true"] {
    color: var(--sidebar-accent);
}

.sidebar-user-avatar {
    width: 2.2rem;
    height: 2.2rem;

    display: grid;
    place-items: center;

    border-radius: 50%;

    background: var(--sidebar-accent);
    color: var(--accent-text);

    font-size: 0.8rem;
    font-weight: 800;
    letter-spacing: 0.06em;
}

.sidebar-user-copy {
    min-width: 0;

    display: grid;
    gap: 0.1rem;
}

.sidebar-user-copy strong,
.sidebar-user-copy span {
    overflow: hidden;

    text-overflow: ellipsis;
    white-space: nowrap;
}

.sidebar-user-copy strong {
    font-size: 0.9rem;
}

.sidebar-user-copy span {
    color: var(--sidebar-muted);

    font-size: 0.72rem;
}

.sidebar-navigation {
    min-height: 0;
    flex: 1 1 auto;

    display: flex;
    flex-direction: column;
    gap: 1rem;

    padding: 1rem;
    overflow-x: hidden;
    overflow-y: auto;
    scrollbar-width: thin;
}

.sidebar-section {
    display: grid;
    gap: 0.3rem;
}

.sidebar-section-title {
    margin: 0 0 0.25rem;
    padding-inline: 0.65rem;

    color: var(--sidebar-muted);

    font-size: 0.66rem;
    font-weight: 800;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    white-space: nowrap;
}

.sidebar-link,
.sidebar-footer-action {
    width: 100%;
    min-width: 0;

    display: grid;
    grid-template-columns: 1.75rem minmax(0, 1fr);
    align-items: center;
    gap: 0.7rem;

    border: 1px solid transparent;
    border-radius: 0.75rem;
    padding: 0.65rem 0.7rem;

    background: transparent;
    color: var(--sidebar-text);

    font-size: 0.88rem;
    font-weight: 650;
    text-align: left;
    text-decoration: none;

    transition:
        background-color 140ms ease,
        border-color 140ms ease,
        color 140ms ease,
        transform 140ms ease;
}

.sidebar-link:hover,
.sidebar-footer-action:hover {
    border-color: var(--sidebar-border);
    background: var(--sidebar-surface);
    color: var(--sidebar-accent);
}

.sidebar-link.is-current {
    border-color: color-mix(
        in srgb,
        var(--sidebar-accent) 30%,
        var(--sidebar-border)
    );

    background: var(--sidebar-surface-active);
    color: var(--sidebar-accent);
}

.sidebar-quick-link {
    border-color: color-mix(
        in srgb,
        var(--sidebar-accent) 25%,
        var(--sidebar-border)
    );
}

.sidebar-icon {
    width: 1.35rem;
    height: 1.35rem;

    fill: none;
    stroke: currentColor;
    stroke-width: 1.7;
    stroke-linecap: round;
    stroke-linejoin: round;

    pointer-events: none;
}

.sidebar-label {
    min-width: 0;

    overflow: hidden;

    text-overflow: ellipsis;
    white-space: nowrap;
}

.sidebar-navigation-group > .sidebar-link {
    grid-template-columns:
        1.75rem
        minmax(0, 1fr)
        1rem;
}

.sidebar-group-chevron {
    width: 1rem;
    height: 1rem;

    fill: none;
    stroke: currentColor;
    stroke-width: 1.8;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.sidebar-subnavigation {
    display: grid;
    gap: 0.12rem;

    margin: 0.25rem 0 0 1.55rem;
    border-left: 1px solid var(--sidebar-border);
    padding-left: 0.7rem;
}

.sidebar-subnavigation a {
    border-radius: 0.55rem;
    padding: 0.5rem 0.65rem;

    color: var(--sidebar-muted);

    font-size: 0.76rem;
    font-weight: 620;
    line-height: 1.3;
    text-decoration: none;
}

.sidebar-subnavigation a:hover,
.sidebar-subnavigation a.is-current {
    background: var(--sidebar-surface);
    color: var(--sidebar-accent);
}

.sidebar-footer {
    flex: 0 0 auto;

    display: grid;
    gap: 0.25rem;

    border-top: 1px solid var(--sidebar-border);
    padding: 0.8rem 1rem 1rem;

    background: var(--sidebar-background);
}

.sidebar-footer form {
    margin: 0;
}

.sidebar-footer-action {
    border: 0;
}

.sidebar-logout-action:hover {
    color: var(--danger);
}

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

.theme-icon-moon {
    display: block;
}

html[data-theme="dark"] .theme-icon-sun {
    display: block;
}

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

html.sidebar-collapsed .app-shell {
    grid-template-columns:
        var(--sidebar-collapsed-width)
        minmax(0, 1fr);
}

html.sidebar-collapsed .sidebar-brand-row {
    display: grid;
    justify-items: center;
    gap: 0.55rem;
}

html.sidebar-collapsed .sidebar-brand {
    flex: 0 0 auto;
}

html.sidebar-collapsed .sidebar-brand-copy,
html.sidebar-collapsed .sidebar-user-copy,
html.sidebar-collapsed .sidebar-label,
html.sidebar-collapsed .sidebar-section-title,
html.sidebar-collapsed .sidebar-group-chevron,
html.sidebar-collapsed .sidebar-subnavigation {
    display: none;
}

html.sidebar-collapsed .sidebar-collapse-icon {
    transform: rotate(180deg);
}

html.sidebar-collapsed .sidebar-user-link,
html.sidebar-collapsed .sidebar-user-action,
html.sidebar-collapsed .sidebar-link,
html.sidebar-collapsed .sidebar-footer-action {
    grid-template-columns: 1.75rem;
    justify-content: center;
    justify-items: center;

    padding-inline: 0.55rem;
}

html.sidebar-collapsed .sidebar-user-link,
html.sidebar-collapsed .sidebar-user-action {
    grid-template-columns: 2.2rem;
}

html.sidebar-collapsed .sidebar-navigation,
html.sidebar-collapsed .sidebar-header,
html.sidebar-collapsed .sidebar-footer {
    padding-inline: 0.75rem;
}

html.sidebar-collapsed .sidebar-navigation {
    align-items: stretch;
}

html.sidebar-collapsed .sidebar-brand-mark {
    width: 2.5rem;
    height: 2.5rem;
}

@media (prefers-reduced-motion: reduce) {
    .app-shell,
    .sidebar-collapse-icon,
    .sidebar-link,
    .sidebar-footer-action,
    body {
        transition: none;
    }
}

/* ========================================================================== */