/* ── Reset ── */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Inter', system-ui, sans-serif;
}

/* ── Design tokens ── */
:root {
    /* Sidebar */
    --sidebar-bg:      #0F172A;
    --sidebar-hover:   #1E293B;
    --sidebar-active:  #1E293B;
    --sidebar-border:  #1E293B;
    --sidebar-text:    #94A3B8;
    --sidebar-text-hi: #F1F5F9;

    /* Accent */
    --accent:          #3B82F6;
    --accent-hover:    #2563EB;

    /* Surface & background */
    --bg:              #F1F5F9;
    --surface:         #FFFFFF;
    --surface-2:       #F8FAFC;
    --border:          #E2E8F0;
    --border-light:    #F1F5F9;

    /* Text */
    --text:            #0F172A;
    --text-2:          #475569;
    --text-3:          #94A3B8;

    /* Status */
    --success:         #15803D;
    --success-bg:      #DCFCE7;
    --warning:         #92400E;
    --warning-bg:      #FEF3C7;
    --danger:          #991B1B;
    --danger-bg:       #FEE2E2;

    /* Elevation */
    --shadow-sm: 0 1px 3px rgba(15,23,42,0.07), 0 1px 2px rgba(15,23,42,0.05);
    --shadow-md: 0 4px 12px rgba(15,23,42,0.09), 0 2px 4px rgba(15,23,42,0.05);
    --shadow-lg: 0 16px 48px rgba(15,23,42,0.14), 0 4px 12px rgba(15,23,42,0.06);

    /* Radii */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;

    /* Motion */
    --transition: 0.15s ease;
}

/* ── Body ── */
body {
    background: linear-gradient(160deg, #F1F5F9 0%, #E8F0FA 100%);
    background-attachment: fixed;
    color: var(--text);
    display: flex;
    min-height: 100vh;
}

/* ── Sidebar ── */
.sidebar {
    width: 230px;
    flex-shrink: 0;
    background: var(--sidebar-bg);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0; left: 0; bottom: 0;
    z-index: 50;
    transition: width 0.22s ease;
}
.sidebar-brand {
    padding: 1.35rem 1rem;
    border-bottom: 1px solid #1E293B;
    display: flex;
    align-items: center;
    gap: 0.65rem;
    text-decoration: none;
}
.brand-icon {
    width: 36px; height: 36px;
    background: var(--accent);
    border-radius: 10px;
    display: flex; align-items: center; justify-content: center;
    font-size: 1rem; color: #fff;
    flex-shrink: 0;
    box-shadow: 0 3px 10px rgba(59,130,246,0.5);
}
.brand-name {
    color: var(--sidebar-text-hi);
    font-weight: 700;
    font-size: 0.95rem;
    letter-spacing: -0.3px;
}
.sidebar-nav { padding: 0.85rem 0.6rem; flex: 1; display: flex; flex-direction: column; }
.nav-section-label {
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #334155;
    padding: 0.5rem 0.65rem 0.4rem;
}
.nav-item {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    padding: 0.55rem 0.65rem;
    border-radius: var(--radius-sm);
    color: var(--sidebar-text);
    text-decoration: none;
    font-size: 0.855rem;
    font-weight: 400;
    transition: background var(--transition), color var(--transition);
    margin-bottom: 2px;
    border-left: 3px solid transparent;
}
.nav-item:hover  { background: var(--sidebar-hover); color: var(--sidebar-text-hi); }
.nav-item.active {
    background: var(--sidebar-active);
    color: var(--sidebar-text-hi);
    border-left-color: var(--accent);
    font-weight: 500;
}
.nav-item i      { font-size: 0.95rem; width: 16px; text-align: center; }
.nav-item.active i { color: var(--accent); }

/* ── Sidebar collapse button (desktop only) ── */
.sidebar-collapse-btn {
    position: absolute;
    right: -12px;
    top: 68px;
    width: 24px;
    height: 24px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    color: var(--text-3);
    box-shadow: var(--shadow-sm);
    z-index: 51;
    transition: color var(--transition), box-shadow var(--transition);
}
.sidebar-collapse-btn:hover {
    color: var(--accent);
    box-shadow: var(--shadow-md);
}
.sidebar-collapse-btn i {
    transition: transform 0.22s ease;
}

/* ── Nav group (expandable section with sub-items) ── */
.nav-group { margin-top: 0.35rem; margin-bottom: 2px; }
.nav-group-hd {
    display: flex; align-items: center; gap: 0.65rem;
    padding: 0.55rem 0.65rem;
    border-radius: var(--radius-sm);
    color: var(--sidebar-text);
    font-size: 0.855rem; font-weight: 400;
    cursor: pointer; user-select: none;
    transition: background var(--transition), color var(--transition);
    border-left: 3px solid transparent;
}
.nav-group-hd:hover { background: var(--sidebar-hover); color: var(--sidebar-text-hi); }
.nav-group-hd.open  { color: var(--sidebar-text-hi); }
.nav-group-hd i.grp-icon { font-size: 0.95rem; width: 16px; text-align: center; flex-shrink: 0; }
.nav-group-chevron  { margin-left: auto; font-size: 0.68rem; flex-shrink: 0; transition: transform 0.2s ease; }
.nav-group-hd.open .nav-group-chevron { transform: rotate(90deg); }

.nav-group-body { display: none; padding-left: 0.35rem; padding-top: 2px; }
.nav-group-hd.open ~ .nav-group-body { display: block; }

.nav-subitem {
    display: flex; align-items: center; gap: 0.65rem;
    padding: 0.48rem 0.65rem 0.48rem 1.1rem;
    border-radius: var(--radius-sm);
    color: var(--sidebar-text);
    text-decoration: none;
    font-size: 0.825rem; font-weight: 400;
    transition: background var(--transition), color var(--transition);
    margin-bottom: 1px;
    border-left: 3px solid transparent;
}
.nav-subitem:hover  { background: var(--sidebar-hover); color: var(--sidebar-text-hi); }
.nav-subitem.active { background: var(--sidebar-active); color: var(--sidebar-text-hi);
                      border-left-color: var(--accent); font-weight: 500; }
.nav-subitem i { font-size: 0.875rem; width: 16px; text-align: center; }
.nav-subitem.active i { color: var(--accent); }

/* ── Collapsed state ── */
.sidebar-collapsed .sidebar           { width: 64px; }
.sidebar-collapsed .sidebar-brand     { justify-content: center; padding: 1.35rem 0; }
.sidebar-collapsed .brand-name        { display: none; }
.sidebar-collapsed .nav-section-label { display: none; }
.sidebar-collapsed .nav-label         { display: none; }
.sidebar-collapsed .nav-item          { justify-content: center; padding: 0.55rem 0; gap: 0; }
.sidebar-collapsed .nav-item i        { width: auto; }
.sidebar-collapsed .sidebar-collapse-btn i { transform: rotate(180deg); }
/* In collapsed mode the group body is always hidden; header centres like a nav-item */
.sidebar-collapsed .nav-group-body  { display: none !important; }
.sidebar-collapsed .nav-group-hd    { justify-content: center; padding: 0.55rem 0; gap: 0; border-left-color: transparent; }
.sidebar-collapsed .nav-group-hd i.grp-icon { width: auto; }
.sidebar-collapsed .nav-group-chevron { display: none; }

/* ── Main layout ── */
.main {
    margin-left: 230px;
    flex: 1;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: margin-left 0.22s ease;
}
.sidebar-collapsed .main { margin-left: 64px; }
.topbar {
    background: linear-gradient(to right, #EFF6FF, #EEF2FF);
    border-bottom: 2px solid var(--accent);
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.12);
    padding: 0 2rem;
    height: 62px;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    position: sticky;
    top: 0;
    z-index: 40;
}
.page-title {
    font-size: 0.975rem;
    font-weight: 700;
    letter-spacing: -0.35px;
    background: linear-gradient(135deg, #1E3A5F 0%, #3B82F6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ── Topbar right cluster ── */
.topbar-end { display: flex; align-items: center; gap: 0.5rem; margin-left: auto; }

/* ── Profile chip (avatar circle + name, single clickable button) ── */
.profile-chip {
    display: flex; align-items: center; gap: 0.5rem;
    background: #fff; cursor: pointer;
    padding: 0.28rem 0.75rem 0.28rem 0.28rem;
    border-radius: 40px;
    border: 1px solid #BFDBFE;
    box-shadow: 0 1px 4px rgba(59, 130, 246, 0.12);
    transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
}
.profile-chip:hover {
    background: #F0F7FF;
    border-color: var(--accent);
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.2);
}
.profile-name {
    font-size: 0.82rem; font-weight: 500; color: #1E3A5F;
    max-width: 140px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}

/* ── Profile avatar circle ── */
.profile-avatar {
    width: 34px; height: 34px;
    border-radius: 50%;
    background: var(--accent);
    color: #fff;
    display: flex; align-items: center; justify-content: center;
    font-size: 0.78rem; font-weight: 700;
    letter-spacing: 0; line-height: 1;
    flex-shrink: 0;
    box-shadow: 0 1px 3px rgba(59,130,246,0.35);
    transition: box-shadow var(--transition);
}
.profile-chip:hover .profile-avatar { box-shadow: 0 2px 6px rgba(59,130,246,0.45); }

/* ── Profile modal large avatar ── */
.profile-avatar-lg {
    width: 48px; height: 48px;
    border-radius: 50%;
    background: var(--accent);
    color: #fff;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.05rem; font-weight: 700;
    flex-shrink: 0;
    box-shadow: 0 2px 8px rgba(59,130,246,0.35);
}

/* ── Buttons ── */
.btn {
    display: inline-flex; align-items: center; gap: 0.4rem;
    font-size: 0.835rem; font-weight: 500;
    padding: 0.5rem 1.05rem;
    border-radius: var(--radius-sm);
    border: none;
    cursor: pointer;
    text-decoration: none;
    transition: background var(--transition), box-shadow var(--transition), color var(--transition);
    line-height: 1.4;
}
.btn-primary  { background: var(--accent); color: #fff; box-shadow: 0 1px 3px rgba(59,130,246,0.35); }
.btn-primary:hover  { background: var(--accent-hover); color: #fff; box-shadow: 0 2px 6px rgba(59,130,246,0.4); }
.btn-primary:disabled { background: #BFDBFE; box-shadow: none; cursor: not-allowed; }
.btn-success  { background: #16A34A; color: #fff; box-shadow: 0 1px 3px rgba(22,163,74,0.25); }
.btn-success:hover  { background: var(--success); }
.btn-success:disabled { background: #86EFAC; box-shadow: none; cursor: not-allowed; }
.btn-outline  { background: transparent; color: var(--text-2); border: 1px solid var(--border); }
.btn-outline:hover  { background: var(--surface-2); color: var(--text); border-color: #CBD5E1; }
.btn-ghost    { background: transparent; color: var(--text-2); border: none; padding: 0.4rem 0.7rem; border-radius: var(--radius-sm); }
.btn-ghost:hover    { background: var(--border-light); color: var(--text); }
.btn-danger   { background: var(--danger); color: #fff; }
.btn-danger:hover   { background: #7F1D1D; color: #fff; }

/* ── Spinner ── */
.spinner {
    width: 18px; height: 18px;
    border: 2px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
    display: inline-block;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Icon button (small square icon-only action button) ── */
.icon-btn {
    background: transparent; border: none; cursor: pointer;
    color: var(--text-3); font-size: 0.85rem;
    padding: 0.38rem 0.48rem; border-radius: var(--radius-sm);
    display: inline-flex; align-items: center; justify-content: center;
    text-decoration: none;
    transition: background var(--transition), color var(--transition);
}
.icon-btn:hover { background: var(--border-light); color: var(--text-2); }
.icon-btn.icon-btn-danger:hover { background: var(--danger-bg); color: var(--danger); }

/* ── Badge ── */
.badge {
    display: inline-flex; align-items: center;
    font-size: 0.7rem; font-weight: 500;
    padding: 0.22em 0.7em;
    border-radius: 20px;
    letter-spacing: 0.01em;
}
.badge-active      { background: var(--success-bg); color: var(--success); }
.badge-vacant      { background: var(--warning-bg); color: var(--warning); }
.badge-maintenance { background: var(--danger-bg);  color: var(--danger); }

/* ── Modal ── */
.modal-overlay {
    display: none; position: fixed; inset: 0;
    background: rgba(15,23,42,0.5);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 200;
    align-items: center; justify-content: center;
}
.modal-overlay.open { display: flex; animation: overlayIn 0.18s ease; }
@keyframes overlayIn { from { opacity: 0; } to { opacity: 1; } }

.modal {
    background: var(--surface);
    border-radius: var(--radius-lg);
    width: 440px;
    max-width: calc(100vw - 2rem);
    max-height: calc(100vh - 3rem);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    animation: modalIn 0.18s ease;
}
@keyframes modalIn {
    from { opacity: 0; transform: translateY(-10px) scale(0.98); }
    to   { opacity: 1; transform: translateY(0)    scale(1); }
}
.modal-header {
    padding: 1.1rem 1.5rem;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
    display: flex; align-items: center; gap: 0.75rem;
}
.modal-title  { font-size: 1rem; font-weight: 700; color: var(--text); letter-spacing: -0.3px; flex: 1; min-width: 0; }
.modal-close  {
    background: transparent; border: none; cursor: pointer;
    color: var(--text-3); font-size: 0.875rem;
    padding: 0.28rem 0.45rem; border-radius: var(--radius-sm);
    display: flex; align-items: center; justify-content: center;
    flex-shrink: 0;
    transition: background var(--transition), color var(--transition);
}
.modal-close:hover { background: var(--border-light); color: var(--text); }
.modal-body   { padding: 1.35rem 1.5rem; overflow-y: auto; flex: 1; }
.modal-footer { padding: 1.1rem 1.5rem; border-top: 1px solid var(--border); display: flex; gap: 0.5rem; justify-content: flex-end; flex-shrink: 0; }

/* ── Forms ── */
.form-group   { margin-bottom: 1.1rem; }
.form-label   { display: block; font-size: 0.825rem; font-weight: 400; color: var(--text-2); margin-bottom: 0.4rem; }
.form-control, .form-select {
    width: 100%;
    padding: 0.55rem 0.875rem;
    font-size: 0.875rem;
    color: var(--text);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    outline: none;
    transition: border-color var(--transition), box-shadow var(--transition);
    font-family: inherit;
}
.form-control:focus, .form-select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(59,130,246,0.15);
}
textarea.form-control { resize: vertical; min-height: 76px; }
.form-error { font-size: 0.8rem; color: var(--danger); margin-top: 0.75rem; display: none; }
.form-error.show { display: block; }

/* ── Content area ── */
.content {
    padding: 2rem;
    flex: 1;
    width: 100%;
}
@media (max-width: 768px) { .content { padding: 1rem; } }

/* ── Footer ── */
.footer {
    margin-top: auto;
    padding: 1.5rem 2rem;
    font-size: 0.73rem;
    color: var(--text-3);
    border-top: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    gap: 0.4rem;
}
.footer-dot { opacity: 0.4; }

/* ── Mobile sidebar toggle ── */
.nav-toggle {
    display: none;
    background: none; border: none; cursor: pointer;
    color: #1E3A5F; font-size: 1.2rem; padding: 0.35rem;
    border-radius: var(--radius-sm); transition: background var(--transition), color var(--transition);
    margin-right: 0.25rem;
}
.nav-toggle:hover { background: rgba(59,130,246,0.08); color: var(--accent); }
.sidebar-overlay {
    display: none; position: fixed; inset: 0;
    background: rgba(15,23,42,0.5); z-index: 49;
}
.sidebar-overlay.open { display: block; }

/* ── Responsive ── */
@media (max-width: 768px) {
    .nav-toggle { display: flex; align-items: center; }
    .sidebar { transform: translateX(-230px); transition: transform 0.22s ease; }
    .sidebar.open { transform: translateX(0); }
    .main { margin-left: 0; transition: none; }
    .sidebar-collapsed .main { margin-left: 0; }
    .sidebar-collapse-btn { display: none; }
    .topbar { padding: 0 1rem; gap: 0.5rem; }
    .footer { padding: 1.25rem 1rem; }
}