/* =============================================================================
   kof-layout.css — App shell.
   v2.0.0
   ----------------------------------------------------------------------------
   Structuur:
     .kof-shell
       .kof-sidebar       (240px charcoal, fixed)
       .kof-shell__main   (flex 1, scrollt)
         .kof-pageheader  (sticky top, 56px)
         .kof-page        (content container met max-width)
   ============================================================================= */

/* ====== Shell ====== */
.kof-shell {
    display: flex;
    min-height: 100vh;
    background: var(--kof-color-surface-alt);
}

.kof-shell__main {
    flex: 1 1 auto;
    display: flex;
    flex-direction: column;
    min-width: 0;       /* prevents flex children from overflowing */
    min-height: 100vh;
}

/* Gutter — ensures page content never sticks to the screen edge.
 * Constraint: max width keeps line lengths readable, padding gives breathing
 * room on both sides for sidebar-based layouts. */
.kof-shell__gutter {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 2.5rem 2rem;
}
@media (max-width: 900px) {
    .kof-shell__gutter {
        padding: 1.5rem 1rem;
    }
}

/* ====== Sidebar ====== */
.kof-sidebar {
    flex: 0 0 var(--kof-sidebar-w);
    width: var(--kof-sidebar-w);
    background: var(--kof-color-sidebar-bg);
    color: var(--kof-color-sidebar-fg);
    display: flex;
    flex-direction: column;
    padding: var(--kof-space-6) var(--kof-space-4);
    gap: var(--kof-space-6);
    border-right: var(--kof-border-hair);
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
}

.kof-sidebar__brand {
    padding: var(--kof-space-2) var(--kof-space-3);
    display: flex;
    align-items: center;
    gap: var(--kof-space-3);
}
.kof-sidebar__brand-logo {
    height: 24px;
    width: auto;
    filter: brightness(0) invert(1);
}

.kof-sidebar__user {
    display: flex;
    align-items: center;
    gap: var(--kof-space-3);
    padding: var(--kof-space-3);
    border-radius: var(--kof-radius-md);
    background: rgba(255,255,255,0.04);
}
.kof-sidebar__user-avatar {
    width: 28px;
    height: 28px;
    border-radius: var(--kof-radius-full);
    background: var(--kof-color-brand);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--kof-font-size-sm);
    font-weight: var(--kof-font-weight-semi);
    flex-shrink: 0;
}
.kof-sidebar__user-meta {
    min-width: 0;
    flex: 1;
}
.kof-sidebar__user-name {
    font-size: var(--kof-font-size-sm);
    font-weight: var(--kof-font-weight-medium);
    color: var(--kof-color-sidebar-fg);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.kof-sidebar__user-role {
    font-size: var(--kof-font-size-xs);
    color: var(--kof-color-sidebar-fg-muted);
}

.kof-sidebar__section-label {
    font-size: var(--kof-font-size-xs);
    color: var(--kof-color-sidebar-fg-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    padding: 0 var(--kof-space-3);
    margin-bottom: var(--kof-space-2);
}

.kof-sidebar__nav {
    display: flex;
    flex-direction: column;
    gap: var(--kof-space-1);
}

.kof-sidebar__link {
    display: flex;
    align-items: center;
    gap: var(--kof-space-3);
    padding: var(--kof-space-3) var(--kof-space-3);
    border-radius: var(--kof-radius-md);
    color: var(--kof-color-sidebar-fg);
    font-size: var(--kof-font-size-sm);
    font-weight: var(--kof-font-weight-medium);
    transition: background var(--kof-transition);
}
.kof-sidebar__link:hover {
    background: var(--kof-color-sidebar-hover);
}
.kof-sidebar__link--active {
    background: var(--kof-color-sidebar-active);
}

.kof-sidebar__link-icon {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}
.kof-sidebar__link-icon svg {
    width: 100%;
    height: 100%;
    stroke-width: 1.75;
}
.kof-sidebar__link-label {
    min-width: 0;
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.kof-sidebar__footer {
    margin-top: auto;
    display: flex;
    flex-direction: column;
    gap: var(--kof-space-1);
}

/* ====== Page header (sticky bar above content) ====== */
.kof-pageheader {
    position: sticky;
    top: 0;
    z-index: var(--kof-z-sticky);
    background: var(--kof-color-surface);
    border-bottom: var(--kof-border-hair);
    height: var(--kof-pageheader-h);
    display: flex;
    align-items: center;
    padding: 0 var(--kof-space-8);
}

.kof-pageheader__inner {
    display: flex;
    align-items: center;
    gap: var(--kof-space-8);
    width: 100%;
    max-width: var(--kof-content-max);
    margin: 0 auto;
}

.kof-pageheader__nav {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.kof-breadcrumbs {
    display: flex;
    align-items: center;
    gap: var(--kof-space-2);
    font-size: var(--kof-font-size-xs);
    color: var(--kof-color-text-muted);
}
.kof-breadcrumbs__item {
    color: var(--kof-color-text-muted);
    transition: color var(--kof-transition);
}
.kof-breadcrumbs__item:hover {
    color: var(--kof-color-ink);
}
.kof-breadcrumbs__sep {
    color: var(--kof-color-text-soft);
}
.kof-breadcrumbs__current {
    color: var(--kof-color-ink);
    font-weight: var(--kof-font-weight-medium);
}

.kof-pageheader__title {
    font-size: var(--kof-font-size-base);
    font-weight: var(--kof-font-weight-semi);
    color: var(--kof-color-ink);
    line-height: var(--kof-line-tight);
}

.kof-pageheader__sub {
    display: none;     /* sub-line collapses on this compact header */
}

.kof-pageheader__actions {
    display: flex;
    align-items: center;
    gap: var(--kof-space-3);
}

/* ====== Page container ====== */
.kof-page {
    flex: 1;
    padding: var(--kof-space-8) var(--kof-space-8);
    max-width: var(--kof-content-max);
    width: 100%;
    margin: 0 auto;
}

.kof-page__header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--kof-space-8);
    margin-bottom: var(--kof-space-8);
    flex-wrap: wrap;
}

.kof-page__title {
    font-size: var(--kof-font-size-h1);
    font-weight: var(--kof-font-weight-semi);
    color: var(--kof-color-ink);
    letter-spacing: var(--kof-letter-tight);
    line-height: var(--kof-line-tight);
}

.kof-page__sub {
    margin-top: var(--kof-space-2);
    font-size: var(--kof-font-size-sm);
    color: var(--kof-color-text-muted);
}

.kof-page__actions {
    display: flex;
    gap: var(--kof-space-3);
    flex-wrap: wrap;
}

/* ====== Section spacing helper ====== */
.kof-section + .kof-section {
    margin-top: var(--kof-space-12);
}

/* ====== Grid utility (2 / 3 / 4 col on page) ====== */
.kof-grid {
    display: grid;
    gap: var(--kof-space-6);
    grid-template-columns: repeat(2, minmax(0, 1fr));
}
@media (min-width: 900px) {
    .kof-grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .kof-grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

/* ====== Responsive ====== */
@media (max-width: 899px) {
    .kof-shell {
        flex-direction: column;
    }
    .kof-sidebar {
        position: relative;
        width: 100%;
        height: auto;
        flex-direction: row;
        overflow-x: auto;
        padding: var(--kof-space-3);
    }
    .kof-sidebar__nav {
        flex-direction: row;
    }
    .kof-sidebar__brand,
    .kof-sidebar__user,
    .kof-sidebar__section-label,
    .kof-sidebar__footer {
        display: none;
    }
    .kof-page {
        padding: var(--kof-space-6) var(--kof-space-4);
    }
    .kof-pageheader {
        padding: 0 var(--kof-space-4);
    }
}