:root {
      --ak-bg:      #060a10;
      --ak-bg2:     #0b1018;
      --ak-bg3:     #111827;
      --ak-accent:  #3b82f6;
      --ak-green:   #22c55e;
      --ak-yellow:  #f59e0b;
      --ak-red:     #ef4444;
      --ak-text:    #e8f0fe;
      --ak-muted:   rgba(232,240,254,.45);
      --ak-border:  rgba(255,255,255,.07);
      --ak-card:    rgba(255,255,255,.04);
      --ak-card-hover: rgba(255,255,255,.07);
      --ak-mono:    'JetBrains Mono', monospace;
      --sidebar-w:  260px;
      --topbar-h:   64px;
      --radius:     12px;
      --radius-sm:  8px;
    }

    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

    html, body {
      background: var(--ak-bg);
      color: var(--ak-text);
      font-family: 'Space Grotesk', sans-serif;
      font-size: 15px;
      line-height: 1.6;
      min-height: 100vh;
    }

    a { color: var(--ak-accent); text-decoration: none; }
    a:hover { color: #60a5fa; }

    /* ── SCROLLBAR ── */
    ::-webkit-scrollbar { width: 6px; height: 6px; }
    ::-webkit-scrollbar-track { background: var(--ak-bg2); }
    ::-webkit-scrollbar-thumb { background: rgba(255,255,255,.15); border-radius: 3px; }

    /* ── LAYOUT ── */
    .ak-layout { display: flex; min-height: 100vh; }

    /* ── SIDEBAR ── */
    .ak-sidebar {
      width: var(--sidebar-w);
      background: var(--ak-bg2);
      border-right: 1px solid var(--ak-border);
      display: flex;
      flex-direction: column;
      position: fixed;
      top: 0; left: 0;
      height: 100vh;
      z-index: 200;
      transition: transform .25s ease;
      overflow-y: auto;
    }
    .ak-sidebar.collapsed { transform: translateX(calc(-1 * var(--sidebar-w))); }

    .ak-sidebar-brand {
      padding: 20px 20px 16px;
      border-bottom: 1px solid var(--ak-border);
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .ak-sidebar-brand .brand-icon {
      width: 38px; height: 38px;
      background: linear-gradient(135deg, #1e40af, #3b82f6);
      border-radius: 10px;
      display: flex; align-items: center; justify-content: center;
      font-size: 18px; font-weight: 700; color: #fff; flex-shrink: 0;
    }
    .ak-sidebar-brand .brand-name {
      font-size: 18px; font-weight: 700; color: var(--ak-text);
      line-height: 1.2;
    }
    .ak-sidebar-brand .brand-school {
      font-size: 11px; color: var(--ak-muted); font-weight: 400;
    }

    .ak-nav { padding: 12px 10px; flex: 1; }

    .ak-nav-section {
      font-size: 10px;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: .08em;
      color: var(--ak-muted);
      padding: 10px 10px 4px;
      margin-top: 8px;
    }

    .ak-nav a {
      display: flex;
      align-items: center;
      gap: 10px;
      padding: 9px 12px;
      border-radius: var(--radius-sm);
      color: var(--ak-muted);
      font-size: 14px;
      font-weight: 500;
      transition: all .15s;
      margin-bottom: 2px;
    }
    .ak-nav a:hover { background: var(--ak-card-hover); color: var(--ak-text); }
    .ak-nav a.active { background: rgba(59,130,246,.15); color: var(--ak-accent); }
    .ak-nav a i { font-size: 16px; width: 20px; text-align: center; flex-shrink: 0; }

    .ak-nav-badge {
      margin-left: auto;
      background: var(--ak-red);
      color: #fff;
      font-size: 10px;
      font-weight: 700;
      padding: 1px 6px;
      border-radius: 20px;
    }

    /* ── TOPBAR ── */
    .ak-topbar {
      position: fixed;
      top: 0; left: var(--sidebar-w); right: 0;
      height: var(--topbar-h);
      background: var(--ak-bg2);
      border-bottom: 1px solid var(--ak-border);
      display: flex;
      align-items: center;
      padding: 0 24px;
      gap: 16px;
      z-index: 100;
      transition: left .25s ease;
    }
    .ak-topbar.full-width { left: 0; }

    .ak-topbar-burger {
      display: none;
      background: none; border: none; color: var(--ak-text);
      font-size: 22px; cursor: pointer; padding: 4px;
    }

    .ak-topbar-title {
      font-size: 16px; font-weight: 600; color: var(--ak-text);
    }

    .ak-topbar-spacer { flex: 1; }

    .ak-topbar-actions {
      display: flex; align-items: center; gap: 12px;
    }

    .ak-notif-btn {
      position: relative;
      background: var(--ak-card);
      border: 1px solid var(--ak-border);
      color: var(--ak-text);
      width: 38px; height: 38px;
      border-radius: var(--radius-sm);
      display: flex; align-items: center; justify-content: center;
      cursor: pointer;
      font-size: 16px;
      transition: background .15s;
    }
    .ak-notif-btn:hover { background: var(--ak-card-hover); }
    .ak-notif-dot {
      position: absolute; top: 6px; right: 6px;
      width: 8px; height: 8px;
      background: var(--ak-red);
      border-radius: 50%;
      border: 2px solid var(--ak-bg2);
    }

    .ak-user-chip {
      display: flex; align-items: center; gap: 8px;
      background: var(--ak-card);
      border: 1px solid var(--ak-border);
      border-radius: var(--radius-sm);
      padding: 5px 12px 5px 8px;
      cursor: pointer;
      transition: background .15s;
    }
    .ak-user-chip:hover { background: var(--ak-card-hover); }
    .ak-user-avatar {
      width: 28px; height: 28px;
      background: linear-gradient(135deg, #1e40af, #3b82f6);
      border-radius: 8px;
      display: flex; align-items: center; justify-content: center;
      font-size: 12px; font-weight: 700; color: #fff;
    }
    .ak-user-name { font-size: 13px; font-weight: 600; }
    .ak-role-badge {
      font-size: 10px; font-weight: 700;
      padding: 2px 7px; border-radius: 20px;
      text-transform: uppercase; letter-spacing: .04em;
    }
    .role-director { background: rgba(139,92,246,.2); color: #a78bfa; }
    .role-teacher  { background: rgba(34,197,94,.15); color: #4ade80; }
    .role-student  { background: rgba(59,130,246,.15); color: #60a5fa; }
    .role-parent   { background: rgba(245,158,11,.15); color: #fbbf24; }

    /* ── MAIN CONTENT ── */
    .ak-main {
      margin-left: var(--sidebar-w);
      margin-top: var(--topbar-h);
      flex: 1;
      padding: 28px 28px 40px;
      min-width: 0;
      transition: margin-left .25s ease;
    }
    .ak-main.full-width { margin-left: 0; }

    /* ── MESSAGES ── */
    .ak-messages { margin-bottom: 20px; }
    .ak-alert {
      display: flex; align-items: flex-start; gap: 10px;
      padding: 12px 16px;
      border-radius: var(--radius-sm);
      margin-bottom: 8px;
      font-size: 14px;
      animation: slideIn .2s ease;
    }
    @keyframes slideIn { from { opacity:0; transform: translateY(-6px); } to { opacity:1; transform:none; } }
    .ak-alert-success { background: rgba(34,197,94,.12); border: 1px solid rgba(34,197,94,.3); color: #4ade80; }
    .ak-alert-error   { background: rgba(239,68,68,.12); border: 1px solid rgba(239,68,68,.3); color: #f87171; }
    .ak-alert-warning { background: rgba(245,158,11,.12); border: 1px solid rgba(245,158,11,.3); color: #fbbf24; }
    .ak-alert-info    { background: rgba(59,130,246,.12); border: 1px solid rgba(59,130,246,.3); color: #60a5fa; }
    .ak-alert-close { margin-left: auto; background: none; border: none; color: inherit; cursor: pointer; font-size: 16px; opacity: .7; }
    .ak-alert-close:hover { opacity: 1; }

    /* ── PAGE HEADER ── */
    .ak-page-header {
      display: flex; align-items: flex-start; justify-content: space-between;
      margin-bottom: 28px; gap: 16px; flex-wrap: wrap;
    }
    .ak-page-title { font-size: 22px; font-weight: 700; }
    .ak-page-sub { font-size: 13px; color: var(--ak-muted); margin-top: 2px; }

    /* ── CARDS ── */
    .ak-card {
      background: var(--ak-card);
      border: 1px solid var(--ak-border);
      border-radius: var(--radius);
      overflow: hidden;
    }
    .ak-card-header {
      padding: 16px 20px;
      border-bottom: 1px solid var(--ak-border);
      display: flex; align-items: center; justify-content: space-between;
      font-weight: 600; font-size: 15px;
    }
    .ak-card-body { padding: 20px; }

    /* ── STAT CARDS ── */
    .ak-stat-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
      gap: 16px;
      margin-bottom: 28px;
    }
    .ak-stat-card {
      background: var(--ak-card);
      border: 1px solid var(--ak-border);
      border-radius: var(--radius);
      padding: 20px;
      display: flex; align-items: flex-start; gap: 14px;
      transition: background .15s, transform .15s;
    }
    .ak-stat-card:hover { background: var(--ak-card-hover); transform: translateY(-2px); }
    .ak-stat-icon {
      width: 44px; height: 44px; border-radius: 10px;
      display: flex; align-items: center; justify-content: center;
      font-size: 20px; flex-shrink: 0;
    }
    .ak-stat-num { font-size: 26px; font-weight: 700; line-height: 1; }
    .ak-stat-label { font-size: 12px; color: var(--ak-muted); margin-top: 3px; }
    .ak-stat-trend { font-size: 11px; margin-top: 4px; }
    .trend-up { color: var(--ak-green); }
    .trend-down { color: var(--ak-red); }

    /* ── BUTTONS ── */
    .btn-ak {
      display: inline-flex; align-items: center; gap: 7px;
      padding: 9px 18px;
      border-radius: var(--radius-sm);
      font-size: 14px; font-weight: 600;
      cursor: pointer; border: none; transition: all .15s;
      font-family: inherit;
      text-decoration: none;
    }
    .btn-primary {
      background: linear-gradient(135deg, #1e40af, #3b82f6);
      color: #fff;
    }
    .btn-primary:hover { background: linear-gradient(135deg, #1d4ed8, #60a5fa); color: #fff; transform: translateY(-1px); box-shadow: 0 4px 14px rgba(59,130,246,.35); }
    .btn-success { background: rgba(34,197,94,.15); color: var(--ak-green); border: 1px solid rgba(34,197,94,.3); }
    .btn-success:hover { background: rgba(34,197,94,.25); color: var(--ak-green); }
    .btn-danger  { background: rgba(239,68,68,.15); color: var(--ak-red); border: 1px solid rgba(239,68,68,.3); }
    .btn-danger:hover  { background: rgba(239,68,68,.25); color: var(--ak-red); }
    .btn-ghost   { background: var(--ak-card); color: var(--ak-muted); border: 1px solid var(--ak-border); }
    .btn-ghost:hover   { background: var(--ak-card-hover); color: var(--ak-text); }
    .btn-sm { padding: 5px 12px; font-size: 12px; }
    .btn-xs { padding: 3px 9px; font-size: 11px; }

    /* ── FORMS ── */
    .ak-form-group { margin-bottom: 18px; }
    .ak-label {
      display: block; margin-bottom: 6px;
      font-size: 13px; font-weight: 600; color: var(--ak-text);
    }
    .ak-label-hint { font-weight: 400; color: var(--ak-muted); font-size: 11px; margin-left: 6px; }
    .ak-input, .ak-select, .ak-textarea {
      width: 100%;
      background: rgba(255,255,255,.05);
      border: 1px solid var(--ak-border);
      border-radius: var(--radius-sm);
      color: var(--ak-text);
      font-family: inherit;
      font-size: 14px;
      padding: 10px 14px;
      transition: border-color .15s, box-shadow .15s;
      outline: none;
    }
    .ak-input:focus, .ak-select:focus, .ak-textarea:focus {
      border-color: var(--ak-accent);
      box-shadow: 0 0 0 3px rgba(59,130,246,.15);
    }
    .ak-input::placeholder, .ak-textarea::placeholder { color: var(--ak-muted); }
    .ak-select { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='rgba(232,240,254,.45)' d='M6 8L1 3h10z'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 12px center; padding-right: 36px; }
    .ak-select option { background: var(--ak-bg3); }
    .ak-textarea { resize: vertical; min-height: 100px; }

    /* ── TABLES ── */
    .ak-table-wrap { overflow-x: auto; }
    .ak-table {
      width: 100%; border-collapse: collapse;
      font-size: 14px;
    }
    .ak-table th {
      padding: 10px 14px;
      text-align: left;
      font-size: 11px;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: .06em;
      color: var(--ak-muted);
      border-bottom: 1px solid var(--ak-border);
      white-space: nowrap;
    }
    .ak-table td {
      padding: 12px 14px;
      border-bottom: 1px solid var(--ak-border);
      vertical-align: middle;
    }
    .ak-table tr:last-child td { border-bottom: none; }
    .ak-table tbody tr:hover td { background: var(--ak-card-hover); }

    /* ── BADGES ── */
    .badge {
      display: inline-flex; align-items: center;
      font-size: 11px; font-weight: 600;
      padding: 3px 9px; border-radius: 20px;
      white-space: nowrap; letter-spacing: .02em;
    }
    .badge-blue   { background: rgba(59,130,246,.15);  color: #60a5fa; }
    .badge-green  { background: rgba(34,197,94,.15);   color: #4ade80; }
    .badge-yellow { background: rgba(245,158,11,.15);  color: #fbbf24; }
    .badge-red    { background: rgba(239,68,68,.15);   color: #f87171; }
    .badge-purple { background: rgba(139,92,246,.15);  color: #a78bfa; }
    .badge-gray   { background: rgba(255,255,255,.08); color: var(--ak-muted); }

    /* ── MODAL ── */
    .ak-modal-overlay {
      position: fixed; inset: 0;
      background: rgba(0,0,0,.6); backdrop-filter: blur(4px);
      z-index: 500; display: none;
      align-items: center; justify-content: center; padding: 20px;
    }
    .ak-modal-overlay.open { display: flex; }
    .ak-modal {
      background: var(--ak-bg3);
      border: 1px solid var(--ak-border);
      border-radius: var(--radius);
      width: 100%; max-width: 540px;
      max-height: 90vh; overflow-y: auto;
      animation: modalIn .2s ease;
    }
    @keyframes modalIn { from { opacity:0; transform: scale(.96); } to { opacity:1; transform: none; } }
    .ak-modal-header {
      padding: 18px 22px;
      border-bottom: 1px solid var(--ak-border);
      display: flex; align-items: center; justify-content: space-between;
      font-size: 16px; font-weight: 700;
    }
    .ak-modal-body { padding: 22px; }
    .ak-modal-footer {
      padding: 16px 22px;
      border-top: 1px solid var(--ak-border);
      display: flex; justify-content: flex-end; gap: 10px;
    }
    .ak-modal-close { background: none; border: none; color: var(--ak-muted); font-size: 20px; cursor: pointer; }
    .ak-modal-close:hover { color: var(--ak-text); }

    /* ── TABS ── */
    .ak-tabs { display: flex; gap: 4px; margin-bottom: 20px; border-bottom: 1px solid var(--ak-border); padding-bottom: 0; }
    .ak-tab {
      padding: 9px 18px;
      font-size: 14px; font-weight: 500;
      color: var(--ak-muted);
      cursor: pointer; border: none; background: none;
      border-bottom: 2px solid transparent;
      margin-bottom: -1px;
      transition: all .15s;
      font-family: inherit;
    }
    .ak-tab:hover { color: var(--ak-text); }
    .ak-tab.active { color: var(--ak-accent); border-bottom-color: var(--ak-accent); font-weight: 600; }

    /* ── GRID ── */
    .ak-grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
    .ak-grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 20px; }
    .ak-row { display: flex; gap: 16px; align-items: flex-start; }
    .ak-row > * { flex: 1; min-width: 0; }

    /* ── EMPTY STATE ── */
    .ak-empty {
      text-align: center; padding: 50px 20px;
      color: var(--ak-muted);
    }
    .ak-empty i { font-size: 40px; margin-bottom: 12px; display: block; opacity: .4; }
    .ak-empty p { font-size: 15px; }

    /* ── AVATAR ── */
    .ak-avatar {
      display: inline-flex; align-items: center; justify-content: center;
      border-radius: 50%; font-weight: 700; color: #fff; flex-shrink: 0;
      background: linear-gradient(135deg, #1e40af, #3b82f6);
    }
    .ak-avatar-sm { width: 32px; height: 32px; font-size: 12px; }
    .ak-avatar-md { width: 40px; height: 40px; font-size: 15px; }
    .ak-avatar-lg { width: 56px; height: 56px; font-size: 20px; }

    /* ── PROGRESS ── */
    .ak-progress {
      height: 6px; background: rgba(255,255,255,.1);
      border-radius: 3px; overflow: hidden;
    }
    .ak-progress-bar {
      height: 100%; border-radius: 3px;
      background: linear-gradient(90deg, #1e40af, #3b82f6);
      transition: width .3s ease;
    }

    /* ── RESPONSIVE ── */
    @media (max-width: 900px) {
      .ak-sidebar { transform: translateX(calc(-1 * var(--sidebar-w))); box-shadow: 4px 0 20px rgba(0,0,0,.5); }
      .ak-sidebar.mobile-open { transform: none; }
      .ak-topbar { left: 0; }
      .ak-topbar-burger { display: flex; }
      .ak-main { margin-left: 0; padding: 16px; }
      .ak-grid-2, .ak-grid-3 { grid-template-columns: 1fr; }
      .ak-row { flex-direction: column; }
    }
    @media (max-width: 600px) {
      .ak-stat-grid { grid-template-columns: 1fr 1fr; }
      .ak-page-header { flex-direction: column; align-items: stretch; }
    }
    @media (max-width: 400px) {
      .ak-stat-grid { grid-template-columns: 1fr; }
    }

    /* ── OVERLAY backdrop for mobile sidebar ── */
    .ak-sidebar-overlay {
      display: none;
      position: fixed; inset: 0; background: rgba(0,0,0,.5);
      z-index: 199;
    }
    .ak-sidebar-overlay.visible { display: block; }

    /* ── MISC ── */
    .text-muted { color: var(--ak-muted); }
    .text-green { color: var(--ak-green); }
    .text-red   { color: var(--ak-red); }
    .text-yellow{ color: var(--ak-yellow); }
    .text-accent{ color: var(--ak-accent); }
    .fw-600 { font-weight: 600; }
    .fw-700 { font-weight: 700; }
    .fs-12 { font-size: 12px; }
    .fs-13 { font-size: 13px; }
    .mono { font-family: var(--ak-mono); }
    .mt-0 { margin-top: 0; }
    .mb-0 { margin-bottom: 0; }
    .mt-8 { margin-top: 8px; }
    .mt-16 { margin-top: 16px; }
    .mb-16 { margin-bottom: 16px; }
    .mb-20 { margin-bottom: 20px; }
    .mb-28 { margin-bottom: 28px; }
    .gap-8 { gap: 8px; }
    .d-flex { display: flex; }
    .align-center { align-items: center; }
    .justify-between { justify-content: space-between; }
    .flex-wrap { flex-wrap: wrap; }