/* ============================================================
   TimeKeeper Admin — Layout (Sidebar · Topbar · Shell)
   Modern-minimal: deep-navy rail, airy content, hairline chrome.
   ============================================================ */

.app-body {
    display: grid;
    grid-template-columns: var(--sidebar-w) 1fr;
    min-height: 100dvh;
}

/* ── Sidebar ── */
.app-sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: var(--sidebar-w);
    padding: 0;
    gap: 0;
    background:
        radial-gradient(120% 60% at 50% -10%, oklch(34% 0.07 264 / 0.55), transparent 70%),
        linear-gradient(185deg, var(--navy-900) 0%, oklch(21% 0.05 266) 100%);
    color: var(--sidebar-fg);
    display: flex;
    flex-direction: column;
    z-index: 100;
    overflow-y: auto;
    border-right: 1px solid var(--sidebar-border);
}
.app-sidebar { scrollbar-color: oklch(100% 0 0 / 0.16) transparent; }
.app-sidebar::-webkit-scrollbar { width: 10px; }
.app-sidebar::-webkit-scrollbar-track { background: transparent; }
.app-sidebar::-webkit-scrollbar-thumb {
    background: oklch(100% 0 0 / 0.14);
    border-radius: var(--radius-full);
    border: 3px solid transparent;
    background-clip: padding-box;
}
.app-sidebar::-webkit-scrollbar-thumb:hover { background: oklch(100% 0 0 / 0.26); }

.sidebar-brand {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    padding: var(--space-5) var(--space-5) var(--space-4);
}
.sidebar-brand .brand {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    text-decoration: none;
    color: inherit;
}
.brand-mark {
    display: grid;
    place-items: center;
    width: 40px;
    height: 40px;
    background: linear-gradient(145deg, var(--navy-400), var(--navy-600));
    box-shadow: inset 0 0 0 1px oklch(100% 0 0 / 0.16), 0 4px 12px oklch(20% 0.06 265 / 0.5);
    border-radius: var(--radius-md);
    font-weight: 800;
    font-size: var(--text-md);
    letter-spacing: 0.01em;
    color: #fff;
    flex-shrink: 0;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.25; }
.brand-text strong { font-size: var(--text-md); font-weight: 700; color: #fff; letter-spacing: -0.01em; }
.brand-text small { font-size: var(--text-xs); color: var(--sidebar-muted); margin-top: 1px; }

.sidebar-close {
    display: none;
    place-items: center;
    width: 36px; height: 36px;
    background: none;
    border: 1px solid var(--sidebar-border);
    border-radius: var(--radius-sm);
    color: var(--sidebar-muted);
    cursor: pointer;
}
.sidebar-close:hover { color: #fff; background: var(--sidebar-hover-bg); }

/* ── Navigation ── */
.sidebar-nav {
    flex: 1;
    padding: var(--space-2) var(--space-3) var(--space-4);
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 1px;
}
.sidebar-nav-label {
    padding: var(--space-4) var(--space-3) var(--space-2);
    font-size: var(--text-xs);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.11em;
    color: var(--sidebar-muted);
}
.sidebar-nav-label:first-child { padding-top: var(--space-2); }

.sidebar-nav a {
    position: relative;
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: 9px var(--space-3);
    font-size: var(--text-base);
    font-weight: 500;
    color: var(--sidebar-fg);
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}
.sidebar-nav a:hover {
    background: var(--sidebar-hover-bg);
    color: var(--sidebar-active-fg);
    text-decoration: none;
}
.sidebar-nav a:focus-visible {
    outline: 2px solid var(--sidebar-indicator);
    outline-offset: -2px;
}
.sidebar-nav a[aria-current="page"] {
    background: var(--sidebar-active-bg);
    color: var(--sidebar-active-fg);
    font-weight: 600;
}
/* active indicator — a soft rounded bar */
.sidebar-nav a[aria-current="page"]::before {
    content: "";
    position: absolute;
    left: -3px;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 18px;
    border-radius: var(--radius-full);
    background: var(--sidebar-indicator);
    box-shadow: 0 0 10px var(--sidebar-indicator);
}
.sidebar-nav a svg {
    flex-shrink: 0; width: 18px; height: 18px;
    opacity: 0.6;
    transition: opacity var(--dur) var(--ease), color var(--dur) var(--ease);
}
.sidebar-nav a:hover svg { opacity: 0.95; }
.sidebar-nav a[aria-current="page"] svg { opacity: 1; color: var(--sidebar-indicator); }

/* ── Sidebar footer ── */
.sidebar-foot {
    padding: var(--space-3) var(--space-3) var(--space-4);
    border-top: 1px solid var(--sidebar-border);
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}
.sidebar-secure {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 0 var(--space-2);
    font-size: var(--text-xs);
    color: var(--sidebar-muted);
}
.sidebar-foot .header-action { margin: 0; }
.sidebar-logout {
    width: 100%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    font-family: var(--font);
    font-size: var(--text-base);
    font-weight: 500;
    color: var(--sidebar-fg);
    background: oklch(100% 0 0 / 0.05);
    border: 1px solid var(--sidebar-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}
.sidebar-logout:hover { background: oklch(100% 0 0 / 0.11); color: #fff; }
.sidebar-logout:focus-visible { outline: 2px solid var(--sidebar-indicator); outline-offset: 2px; }
.sidebar-logout svg { width: 16px; height: 16px; }

/* ── Main area ── */
.app-main {
    grid-column: 2;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
}

/* ── Topbar ── */
.app-topbar {
    position: sticky;
    top: 0;
    z-index: 50;
    height: var(--topbar-h);
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: 0 var(--space-6);
    background: oklch(100% 0 0 / 0.8);
    -webkit-backdrop-filter: saturate(1.4) blur(10px);
    backdrop-filter: saturate(1.4) blur(10px);
    border-bottom: 1px solid var(--border);
}
.topbar-title {
    font-size: var(--text-md);
    font-weight: 650;
    color: var(--ink-strong);
    letter-spacing: -0.01em;
}
.topbar-actions {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: var(--space-3);
}
.topbar-user {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: 5px 10px 5px 6px;
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    background: var(--surface);
    font-size: var(--text-sm);
    color: var(--muted-strong);
}
.topbar-user .avatar {
    display: grid;
    place-items: center;
    width: 24px; height: 24px;
    border-radius: var(--radius-full);
    background: linear-gradient(145deg, var(--navy-400), var(--navy-600));
    color: #fff;
    font-size: var(--text-xs);
    font-weight: 700;
}

.sidebar-toggle {
    display: none;
    place-items: center;
    width: 40px; height: 40px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--ink);
    cursor: pointer;
}
.sidebar-toggle:hover { background: var(--surface-alt); }

/* ── Page shell ── */
.page-shell {
    flex: 1;
    width: 100%;
    max-width: 1360px;
    margin: 0 auto;
    padding: var(--space-6) var(--space-6) var(--space-8);
}
.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    margin-bottom: var(--space-6);
    flex-wrap: wrap;
}
.page-title {
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--ink-strong);
    letter-spacing: -0.025em;
    margin: 0;
}

/* ── Footer ── */
.site-footer {
    padding: var(--space-4) var(--space-6);
    border-top: 1px solid var(--border);
}
.footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: var(--text-xs);
    color: var(--muted);
    max-width: 1360px;
    margin: 0 auto;
}

/* ── Auth pages own their layout in legacy admin.css ── */

/* ── Responsive ── */
@media (max-width: 1024px) {
    .app-body { grid-template-columns: 1fr; }
    .app-main { grid-column: 1; }
    .app-sidebar {
        transform: translateX(-100%);
        transition: transform var(--dur) var(--ease);
        box-shadow: var(--shadow-lg);
    }
    .app-sidebar.is-open { transform: translateX(0); }
    .sidebar-close { display: grid; }
    .sidebar-toggle { display: grid; }
    .sidebar-scrim {
        position: fixed;
        inset: 0;
        background: oklch(20% 0.04 265 / 0.4);
        z-index: 99;
        opacity: 0;
        visibility: hidden;
        transition: opacity var(--dur) var(--ease), visibility var(--dur);
    }
    .sidebar-scrim.is-open { opacity: 1; visibility: visible; }
}

@media (max-width: 640px) {
    .page-shell { padding: var(--space-4) var(--space-4) var(--space-7); }
    .app-topbar { padding: 0 var(--space-4); }
    .brand-text small { display: none; }
}