/* ==========================================================
   Layout admin : sidebar + topbar + main
   ========================================================== */

.app-shell {
    display: grid;
    grid-template-columns: var(--sidebar-width) 1fr;
    min-height: 100vh;
}

@media (max-width: 900px) {
    .app-shell {
        grid-template-columns: 1fr;
    }
}

/* ----- Sidebar ----- */
.sidebar {
    background: var(--color-surface);
    border-right: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
}

@media (max-width: 900px) {
    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        width: min(280px, 85vw);
        z-index: var(--z-modal, 50);
        transform: translateX(-100%);
        transition: transform var(--duration-normal, 200ms) var(--ease-default, ease);
        box-shadow: var(--shadow-xl, 0 10px 30px rgba(0,0,0,0.18));
    }
    body.sidebar-open .sidebar {
        transform: translateX(0);
    }
}

/* ----- Sidebar backdrop (mobile only) ----- */
.sidebar-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.45);
    z-index: calc(var(--z-modal, 50) - 1);
    opacity: 0;
    transition: opacity var(--duration-normal, 200ms) var(--ease-default, ease);
}
@media (max-width: 900px) {
    body.sidebar-open .sidebar-backdrop {
        display: block;
        opacity: 1;
    }
}

/* ----- Sidebar toggle button (mobile only) ----- */
.sidebar-toggle {
    display: none;
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    width: 40px;
    height: 40px;
    align-items: center;
    justify-content: center;
    color: var(--color-text);
    cursor: pointer;
    flex-shrink: 0;
}
.sidebar-toggle:hover {
    background: var(--color-surface-alt);
}
.sidebar-toggle .icon {
    width: 20px;
    height: 20px;
}
@media (max-width: 900px) {
    .sidebar-toggle {
        display: inline-flex;
    }
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-5) var(--space-6);
    border-bottom: 1px solid var(--color-border);
    height: var(--topbar-height);
}

.sidebar-brand .logo-mark {
    width: 32px;
    height: 32px;
    flex-shrink: 0;
    color: var(--color-accent);
}

.sidebar-brand .name {
    font-weight: var(--fw-semibold);
    font-size: var(--fs-md);
    letter-spacing: var(--tracking-tight);
    line-height: 1.2;
}
.sidebar-brand .name small {
    display: block;
    font-size: var(--fs-xs);
    color: var(--color-text-muted);
    font-weight: var(--fw-regular);
}

.sidebar-nav {
    padding: var(--space-4) var(--space-3);
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
    flex: 1;
}

.sidebar-section-title {
    padding: var(--space-3) var(--space-3) var(--space-1);
    font-size: var(--fs-xs);
    font-weight: var(--fw-semibold);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wide);
    color: var(--color-text-soft);
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    color: var(--color-text-muted);
    font-size: var(--fs-sm);
    font-weight: var(--fw-medium);
    transition: background-color var(--duration-fast) var(--ease-default),
                color var(--duration-fast) var(--ease-default);
}

.sidebar-link:hover {
    background: var(--color-surface-alt);
    color: var(--color-text);
}

.sidebar-link.active {
    background: var(--color-accent-soft);
    color: var(--color-accent-darker);
}

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

.sidebar-link .icon {
    width: 18px;
    height: 18px;
    color: var(--color-text-soft);
    flex-shrink: 0;
}

.sidebar-footer {
    padding: var(--space-4);
    border-top: 1px solid var(--color-border);
    font-size: var(--fs-xs);
    color: var(--color-text-soft);
}

/* ----- Topbar ----- */
.topbar {
    height: var(--topbar-height);
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-6);
    gap: var(--space-4);
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    backdrop-filter: saturate(180%) blur(10px);
}

.topbar-search {
    flex: 1;
    max-width: 480px;
}

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

.user-chip {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-full);
    background: var(--color-surface-alt);
    transition: background-color var(--duration-fast) var(--ease-default);
}

.user-chip:hover { background: var(--color-border-soft); }

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--color-accent);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--fw-semibold);
    font-size: var(--fs-sm);
    flex-shrink: 0;
}

.user-meta { display: flex; flex-direction: column; line-height: 1.1; }
.user-meta .name { font-weight: var(--fw-medium); font-size: var(--fs-sm); }
.user-meta .role { font-size: var(--fs-xs); color: var(--color-text-muted); }

/* ----- Main ----- */
.main {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    min-width: 0;
}

.page {
    padding: var(--space-8) var(--space-6);
    flex: 1;
    max-width: var(--container-max);
    width: 100%;
    margin: 0 auto;
}

.page-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--space-4);
    margin-bottom: var(--space-8);
}

.page-title {
    font-size: var(--fs-2xl);
    font-weight: var(--fw-bold);
    letter-spacing: var(--tracking-tight);
    margin: 0;
}

.page-subtitle {
    color: var(--color-text-muted);
    font-size: var(--fs-sm);
    margin-top: var(--space-1);
}

.page-actions {
    display: flex;
    gap: var(--space-2);
}

.grid {
    display: grid;
    gap: var(--space-5);
}

.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid-5 { grid-template-columns: repeat(5, minmax(0, 1fr)); }

@media (max-width: 1100px) {
    .grid-4, .grid-5 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 700px) {
    .grid-2, .grid-3, .grid-4, .grid-5 { grid-template-columns: 1fr; }
}

@media (max-width: 900px) {
    .topbar {
        padding: 0 var(--space-3);
        gap: var(--space-2);
    }
    .topbar-search { max-width: none; min-width: 0; }
    .user-meta { display: none; }
    .page { padding: var(--space-5) var(--space-4); }
    .page-header {
        flex-direction: column;
        align-items: stretch;
        margin-bottom: var(--space-5);
    }
    .page-actions { flex-wrap: wrap; }
}
@media (max-width: 600px) {
    .topbar-search { display: none; }
}

/* ----- Layout auth (login centre) ----- */
.auth-shell {
    min-height: 100vh;
    display: grid;
    grid-template-columns: 1fr;
    background:
        radial-gradient(1000px 600px at -10% 110%, rgba(16, 185, 129, 0.10), transparent 60%),
        radial-gradient(800px 500px at 110% -20%, rgba(14, 165, 233, 0.06), transparent 60%),
        var(--color-bg);
    place-items: center;
    padding: var(--space-6);
}

.auth-card {
    width: 100%;
    max-width: 420px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    box-shadow: var(--shadow-lg);
}

.auth-brand {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-6);
}

.auth-brand .logo-mark {
    width: 36px;
    height: 36px;
    color: var(--color-accent);
}

.auth-brand .name {
    font-weight: var(--fw-bold);
    font-size: var(--fs-md);
    letter-spacing: var(--tracking-tight);
}
.auth-brand .name small {
    display: block;
    font-size: var(--fs-xs);
    color: var(--color-text-muted);
    font-weight: var(--fw-regular);
}

.auth-title {
    font-size: var(--fs-2xl);
    font-weight: var(--fw-bold);
    letter-spacing: var(--tracking-tight);
    margin-bottom: var(--space-2);
}

.auth-subtitle {
    color: var(--color-text-muted);
    font-size: var(--fs-sm);
    margin-bottom: var(--space-6);
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.auth-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: var(--space-2);
}

.auth-footer {
    margin-top: var(--space-6);
    padding-top: var(--space-5);
    border-top: 1px solid var(--color-border);
    font-size: var(--fs-xs);
    color: var(--color-text-muted);
    text-align: center;
}

/* ----- Dashboard cards ----- */
.kpi {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    transition: transform var(--duration-normal) var(--ease-default),
                box-shadow var(--duration-normal) var(--ease-default);
}

.kpi:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.kpi-label {
    font-size: var(--fs-xs);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wide);
    color: var(--color-text-muted);
    font-weight: var(--fw-semibold);
}

.kpi-value {
    font-size: var(--fs-3xl);
    font-weight: var(--fw-bold);
    letter-spacing: var(--tracking-tight);
    color: var(--color-text);
    line-height: 1;
    margin-top: var(--space-1);
}

.kpi-trend {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    font-size: var(--fs-xs);
    color: var(--color-text-muted);
}

.kpi-icon {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    background: var(--color-accent-soft);
    color: var(--color-accent-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-3);
}
.kpi-icon .icon { width: 18px; height: 18px; }