/* ============================================
   EduAI Admin Console — Mobile-First Stylesheet
   ============================================ */
:root {
  --a-bg:      #0f172a;
  --a-bg2:     #1e293b;
  --a-bg3:     #334155;
  --a-accent:  #3b82f6;
  --a-accent2: #1d4ed8;
  --a-success: #22c55e;
  --a-warn:    #f59e0b;
  --a-danger:  #ef4444;
  --a-text:    #f1f5f9;
  --a-text2:   #94a3b8;
  --a-text3:   #64748b;
  --a-border:  #334155;
  --a-border2: #475569;
  --a-card:    #1e293b;
  --a-card2:   #263244;
  --a-r:       10px;
  --a-rl:      16px;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
body.admin-body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;background:var(--a-bg);color:var(--a-text);min-height:100vh;font-size:14px}

/* ── LOGIN GATE ── */
.admin-gate{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:1rem;background:linear-gradient(135deg,#0f172a 0%,#1e3a5f 100%)}
.gate-card{background:var(--a-card);border:1px solid var(--a-border2);border-radius:var(--a-rl);padding:2.5rem 2rem;width:100%;max-width:420px;box-shadow:0 25px 50px rgba(0,0,0,.5)}
.gate-card .auth-logo{font-size:1.5rem;font-weight:800;color:var(--a-text);text-align:center;margin-bottom:1.5rem}
.gate-card h1{font-size:1.3rem;font-weight:700;text-align:center;margin-bottom:.25rem}
.auth-sub{color:var(--a-text2);font-size:13px;text-align:center;margin-bottom:1.5rem}
.auth-form{display:flex;flex-direction:column;gap:.9rem}
.auth-form label{display:flex;flex-direction:column;gap:5px;font-size:13px;font-weight:600;color:var(--a-text2)}
.auth-form input,.auth-form select{padding:.65rem .9rem;background:var(--a-bg);border:1px solid var(--a-border2);border-radius:var(--a-r);color:var(--a-text);font-size:14px;transition:border-color .15s;width:100%}
.auth-form input:focus,.auth-form select:focus{outline:none;border-color:var(--a-accent)}
.auth-msg{padding:.6rem .9rem;border-radius:var(--a-r);font-size:13px;margin-bottom:.75rem}
.auth-msg.error{background:rgba(239,68,68,.15);color:#fca5a5;border:1px solid rgba(239,68,68,.3)}
.auth-msg.success{background:rgba(34,197,94,.15);color:#86efac;border:1px solid rgba(34,197,94,.3)}
.gate-hint{font-size:12px;color:var(--a-text3);background:var(--a-bg);border-radius:var(--a-r);padding:.65rem .9rem;margin-top:.9rem;text-align:center;border:1px solid var(--a-border)}
.gate-hint strong{color:var(--a-text2)}
.auth-back{display:block;text-align:center;font-size:12px;color:var(--a-text3);margin-top:.75rem;text-decoration:none}
.auth-back:hover{color:var(--a-accent)}

/* ── BUTTONS ── */
.btn-primary{background:var(--a-accent);color:#fff;border:none;padding:.65rem 1.2rem;border-radius:var(--a-r);font-size:14px;font-weight:600;cursor:pointer;transition:background .15s;display:inline-flex;align-items:center;gap:.4rem}
.btn-primary:hover{background:var(--a-accent2)}
.btn-outline{background:transparent;color:var(--a-text);border:1px solid var(--a-border2);padding:.55rem 1rem;border-radius:var(--a-r);font-size:13px;font-weight:600;cursor:pointer;transition:all .15s;display:inline-flex;align-items:center;gap:.4rem;text-decoration:none}
.btn-outline:hover{border-color:var(--a-accent);color:var(--a-accent)}
.btn-danger{background:transparent;color:var(--a-danger);border:1px solid var(--a-danger);padding:.4rem .85rem;border-radius:var(--a-r);font-size:12px;font-weight:600;cursor:pointer;transition:all .15s;display:inline-flex;align-items:center;gap:4px}
.btn-danger:hover{background:rgba(239,68,68,.1)}
.btn-sm{padding:.4rem .8rem!important;font-size:12px!important}
.btn-full{width:100%;justify-content:center}
.admin-chip{font-size:10px;background:rgba(245,158,11,.2);color:#f59e0b;padding:2px 7px;border-radius:4px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;vertical-align:middle;margin-left:6px}

/* ── LAYOUT: HEADER + SIDEBAR + MAIN ── */
.admin-wrap{display:flex;flex-direction:column;min-height:100vh}
.admin-header{background:var(--a-card);border-bottom:1px solid var(--a-border);position:sticky;top:0;z-index:100;width:100%}
.admin-header-inner{display:flex;align-items:center;justify-content:space-between;padding:.75rem 1rem;gap:.5rem;flex-wrap:wrap}
.admin-logo{font-size:1.1rem;font-weight:800;color:var(--a-text);display:flex;align-items:center;gap:4px;white-space:nowrap}
.admin-header-right{display:flex;gap:8px;flex-shrink:0}

/* Mobile nav bar (horizontal, scrollable) */
.admin-nav-bar{background:var(--a-bg2);border-bottom:1px solid var(--a-border);overflow-x:auto;display:flex;gap:0;padding:0;scrollbar-width:none;-webkit-overflow-scrolling:touch;white-space:nowrap;flex-shrink:0}
.admin-nav-bar::-webkit-scrollbar{display:none}
.admin-nav-btn{display:inline-flex;align-items:center;gap:.4rem;padding:.7rem 1rem;border:none;background:none;color:var(--a-text2);font-size:13px;font-weight:600;cursor:pointer;border-bottom:3px solid transparent;transition:all .15s;white-space:nowrap;flex-shrink:0}
.admin-nav-btn:hover{color:var(--a-text);background:rgba(255,255,255,.04)}
.admin-nav-btn.active{color:var(--a-accent);border-bottom-color:var(--a-accent);background:rgba(59,130,246,.06)}
.nav-icon{font-size:15px}

/* Content area */
.admin-body-area{flex:1;overflow-y:auto}
.admin-main{max-width:1200px;margin:0 auto;padding:1.5rem 1rem 3rem}
.admin-view{display:none}
.admin-view.active{display:block}

/* ── HEADINGS ── */
.view-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:1.25rem;flex-wrap:wrap;gap:.5rem}
.view-title{font-size:1.3rem;font-weight:800;color:var(--a-text)}
.view-subtitle{font-size:.95rem;font-weight:700;margin:1.5rem 0 .65rem;color:var(--a-text)}

/* ── STAT GRID ── */
.stat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:10px;margin-bottom:1.5rem}
.stat-card{background:var(--a-card2);border:1px solid var(--a-border2);border-radius:var(--a-rl);padding:1.1rem .9rem;text-align:center;border-top:3px solid var(--a-accent)}
.stat-card:nth-child(2){border-top-color:var(--a-success)}
.stat-card:nth-child(3){border-top-color:var(--a-warn)}
.stat-card:nth-child(4){border-top-color:#a78bfa}
.stat-card:nth-child(5){border-top-color:#f472b6}
.stat-card:nth-child(6){border-top-color:#34d399}
.stat-icon{font-size:1.3rem;margin-bottom:.25rem}
.stat-num{font-size:1.8rem;font-weight:800;color:var(--a-text);line-height:1}
.stat-label{font-size:10px;color:var(--a-text2);margin-top:4px;text-transform:uppercase;letter-spacing:.05em}

/* ── CARDS / TOOLBAR ── */
.admin-card{background:var(--a-card2);border:1px solid var(--a-border2);border-radius:var(--a-rl);padding:1.15rem;margin-bottom:1rem}
.admin-card h3{font-size:14px;font-weight:700;color:var(--a-text);margin-bottom:.9rem}
.admin-card p.muted-text{color:var(--a-text2);font-size:13px;margin-bottom:.65rem}
.admin-toolbar{display:flex;gap:8px;flex-wrap:wrap;align-items:center;background:var(--a-card);border:1px solid var(--a-border);border-radius:var(--a-r);padding:.6rem .85rem;margin-bottom:1rem}
.admin-toolbar input,.admin-toolbar select{background:var(--a-bg);border:1px solid var(--a-border2);color:var(--a-text);border-radius:var(--a-r);padding:.45rem .7rem;font-size:13px}
.admin-toolbar input{flex:1;min-width:140px}
.admin-toolbar select option{background:var(--a-bg)}
.admin-toolbar input:focus,.admin-toolbar select:focus{outline:none;border-color:var(--a-accent)}

/* ── TABLE ── */
.table-wrap{background:var(--a-card2);border:1px solid var(--a-border2);border-radius:var(--a-rl);overflow:hidden;overflow-x:auto}
table.admin-table{width:100%;border-collapse:collapse;font-size:13px;min-width:600px}
table.admin-table th{text-align:left;padding:.65rem .85rem;background:var(--a-bg2);font-weight:700;font-size:11px;text-transform:uppercase;letter-spacing:.05em;color:var(--a-text2);border-bottom:1px solid var(--a-border2)}
table.admin-table td{padding:.65rem .85rem;border-bottom:1px solid var(--a-border);color:var(--a-text);vertical-align:middle}
table.admin-table tr:last-child td{border-bottom:none}
table.admin-table tr:hover td{background:rgba(255,255,255,.02)}
.level-tag{background:rgba(59,130,246,.18);color:#93c5fd;padding:2px 9px;border-radius:20px;font-size:11px;font-weight:700;white-space:nowrap}
.row-actions{display:flex;gap:6px}
.icon-btn{background:var(--a-bg);border:1px solid var(--a-border2);border-radius:6px;width:30px;height:30px;cursor:pointer;font-size:13px;display:inline-flex;align-items:center;justify-content:center;color:var(--a-text2);transition:all .15s;flex-shrink:0}
.icon-btn:hover{border-color:var(--a-accent);color:var(--a-accent);background:rgba(59,130,246,.1)}
.icon-btn.danger:hover{border-color:var(--a-danger);color:var(--a-danger);background:rgba(239,68,68,.1)}

/* ── BREAKDOWN ── */
.breakdown-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:8px}
.breakdown-item{background:var(--a-card2);border:1px solid var(--a-border);border-radius:var(--a-r);padding:.65rem .85rem;display:flex;justify-content:space-between;align-items:center;font-size:12.5px}
.breakdown-item strong{color:var(--a-accent);font-size:1.05rem;font-weight:800}

/* ── CONTENT TABS ── */
.content-level-tabs{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:1.1rem}
.level-tab-btn{padding:.45rem .9rem;border-radius:20px;border:1px solid var(--a-border2);background:var(--a-card);font-size:12.5px;font-weight:600;cursor:pointer;color:var(--a-text2);transition:all .15s}
.level-tab-btn:hover{border-color:var(--a-accent);color:var(--a-accent)}
.level-tab-btn.active{border-color:var(--a-accent);background:var(--a-accent);color:#fff}

/* ── FACULTY/PROGRAMME EDITOR ── */
.faculty-block{background:var(--a-card);border:1px solid var(--a-border2);border-radius:var(--a-rl);margin-bottom:.75rem;overflow:hidden}
.faculty-head{display:flex;align-items:center;justify-content:space-between;padding:.85rem 1rem;background:var(--a-bg2);cursor:pointer}
.faculty-head:hover{background:var(--a-bg3)}
.faculty-head h4{font-size:13.5px;font-weight:700;color:var(--a-text)}
.faculty-body{padding:.9rem 1rem;display:none}
.faculty-body.open{display:block}
.programme-row{border:1px solid var(--a-border);border-radius:var(--a-r);padding:.8rem .9rem;margin-bottom:.65rem;background:var(--a-bg2)}
.programme-row-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:.55rem}
.programme-row-head strong{font-size:13px;color:var(--a-text)}
.course-chip-row{display:flex;flex-wrap:wrap;gap:5px;margin-top:.4rem}
.course-chip{background:rgba(59,130,246,.15);color:#93c5fd;font-size:11.5px;padding:3px 9px;border-radius:20px;display:inline-flex;align-items:center;gap:5px}
.course-chip button{background:none;border:none;cursor:pointer;color:#60a5fa;font-size:13px;line-height:1;padding:0}
.course-chip button:hover{color:var(--a-danger)}
.inline-add-row{display:flex;gap:6px;margin-top:.65rem}
.inline-add-row input{flex:1;min-width:0;padding:.4rem .7rem;background:var(--a-bg);border:1px solid var(--a-border2);border-radius:var(--a-r);color:var(--a-text);font-size:12.5px}
.inline-add-row input:focus{outline:none;border-color:var(--a-accent)}

/* ── SUBJECT EDITOR ── */
.subject-block{background:var(--a-card);border:1px solid var(--a-border2);border-radius:var(--a-rl);padding:.9rem 1rem;margin-bottom:.75rem}
.subject-block-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:.6rem}
.subject-block-head strong{font-size:13.5px;font-weight:700;color:var(--a-text)}
.topic-chip-row{display:flex;flex-wrap:wrap;gap:5px}
.topic-chip{background:rgba(255,255,255,.07);color:var(--a-text);font-size:11.5px;padding:3px 9px;border-radius:20px;display:inline-flex;align-items:center;gap:5px;border:1px solid var(--a-border)}
.topic-chip button{background:none;border:none;cursor:pointer;color:var(--a-text3);font-size:13px;line-height:1;padding:0}
.topic-chip button:hover{color:var(--a-danger)}

/* ── EXAM BUILDER ── */
.exam-q-card{background:var(--a-card);border:1px solid var(--a-border2);border-radius:var(--a-rl);padding:1rem;margin-bottom:.75rem}
.exam-q-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:.65rem}
.exam-q-head strong{font-size:13px;color:var(--a-text2)}
.exam-q-card input[type="text"]{width:100%;padding:.5rem .75rem;background:var(--a-bg);border:1px solid var(--a-border2);border-radius:var(--a-r);color:var(--a-text);font-size:13px;margin-bottom:.45rem}
.exam-q-card input[type="text"]:focus{outline:none;border-color:var(--a-accent)}
.exam-opt-row{display:flex;align-items:center;gap:8px;margin-bottom:6px}
.exam-opt-row input[type="radio"]{width:16px;height:16px;flex-shrink:0;accent-color:var(--a-accent);cursor:pointer}
.exam-opt-row input[type="text"]{margin-bottom:0}
.exam-opt-row input[type="radio"]:checked+input{border-color:var(--a-success);background:rgba(34,197,94,.06)}
.empty-state{text-align:center;padding:2.5rem 1rem;color:var(--a-text3);font-size:13px}
.empty-state-icon{font-size:2rem;margin-bottom:.5rem}

/* ── VIDEO FORM + GRID ── */
.video-form-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:8px;align-items:end;margin-top:.65rem}
.video-form-grid label{display:flex;flex-direction:column;gap:4px;font-size:12px;font-weight:600;color:var(--a-text2)}
.video-form-grid input,.video-form-grid select{padding:.45rem .7rem;background:var(--a-bg);border:1px solid var(--a-border2);border-radius:var(--a-r);color:var(--a-text);font-size:13px}
.video-form-grid input:focus,.video-form-grid select:focus{outline:none;border-color:var(--a-accent)}
.video-form-grid select option{background:var(--a-bg)}
.video-admin-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(170px,1fr));gap:10px}
.video-admin-card{background:var(--a-card);border:1px solid var(--a-border2);border-radius:var(--a-rl);overflow:hidden}
.video-admin-thumb{width:100%;aspect-ratio:16/9;background:var(--a-bg);overflow:hidden}
.video-admin-thumb img{width:100%;height:100%;object-fit:cover;display:block}
.video-admin-body{padding:.65rem .8rem}
.video-admin-title{font-size:12px;font-weight:700;margin-bottom:2px;color:var(--a-text)}
.video-admin-meta{font-size:11px;color:var(--a-text3);margin-bottom:.4rem}

/* ── DANGER ZONE ── */
.danger-zone{border:1px solid rgba(239,68,68,.35);border-radius:var(--a-rl);padding:1rem;background:rgba(239,68,68,.05)}
.danger-zone p{color:var(--a-text2);font-size:13px;margin-bottom:.65rem}

/* ── TOAST ── */
.adm-toast{position:fixed;bottom:16px;right:16px;left:16px;background:var(--a-card2);color:var(--a-text);border:1px solid var(--a-border2);border-left:3px solid var(--a-accent);padding:.7rem 1rem;border-radius:var(--a-r);font-size:13px;z-index:9999;box-shadow:0 8px 24px rgba(0,0,0,.4);animation:slideUp .2s ease;max-width:400px;margin:0 auto}
@keyframes slideUp{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}

/* ── SCROLLBAR ── */
::-webkit-scrollbar{width:5px;height:5px}
::-webkit-scrollbar-track{background:var(--a-bg)}
::-webkit-scrollbar-thumb{background:var(--a-border2);border-radius:3px}

/* ── RESPONSIVE: desktop gets sidebar ── */
@media(min-width:900px){
  .admin-wrap{display:grid;grid-template-columns:220px 1fr;grid-template-rows:auto auto 1fr}
  .admin-header{grid-column:1/-1}
  .admin-nav-bar{grid-column:1;grid-row:2/4;flex-direction:column;border-bottom:none;border-right:1px solid var(--a-border);overflow-y:auto;overflow-x:hidden;padding:.75rem 0;gap:2px}
  .admin-nav-btn{border-bottom:none;border-left:3px solid transparent;border-radius:0 var(--a-r) var(--a-r) 0;padding:.65rem 1rem;justify-content:flex-start}
  .admin-nav-btn.active{border-left-color:var(--a-accent);border-bottom:none}
  .admin-body-area{grid-column:2;grid-row:2/4;overflow-y:auto}
  .adm-toast{left:auto;right:24px;bottom:24px;width:auto;min-width:260px}
}

/* ── LEARNING OBJECTIVES: topic-chip button + editor modal ── */
.btn-obj{background:none;border:none;cursor:pointer;color:var(--a-accent);font-size:13px;line-height:1;padding:0;margin-left:2px}
.btn-obj:hover{filter:brightness(1.2)}

.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.55);display:flex;align-items:center;justify-content:center;z-index:10000;padding:1rem}
.modal-box{background:var(--a-card);border:1px solid var(--a-border2);border-radius:var(--a-rl);padding:1.25rem;max-width:480px;width:100%;max-height:85vh;overflow-y:auto;box-shadow:0 20px 60px rgba(0,0,0,.5)}
.modal-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:.25rem}
.modal-head h3{font-size:15px;font-weight:700;color:var(--a-text)}
.modal-actions{display:flex;justify-content:space-between;gap:8px;margin-top:1rem;flex-wrap:wrap}

.obj-edit-row{display:flex;gap:6px;align-items:center;margin-bottom:6px}
.obj-edit-row select{flex:0 0 54px;background:var(--a-bg);border:1px solid var(--a-border2);border-radius:var(--a-r);color:var(--a-text);font-size:15px;padding:.35rem}
.obj-edit-row input{flex:1;min-width:0;background:var(--a-bg);border:1px solid var(--a-border2);border-radius:var(--a-r);color:var(--a-text);font-size:12.5px;padding:.4rem .6rem}
.obj-edit-row .btn-del-obj{background:none;border:none;color:var(--a-text3);cursor:pointer;font-size:14px;padding:0 4px}
.obj-edit-row .btn-del-obj:hover{color:var(--a-danger)}

/* ── Backend DB sync banner ── */
.sync-banner { font-size: 12.5px; padding: .6rem 1rem; text-align: center; font-weight: 600; }
.sync-banner.ok      { background: rgba(34,197,94,.15); color: #4ade80; }
.sync-banner.warn    { background: rgba(245,158,11,.15); color: #fbbf24; }
.sync-banner.error    { background: rgba(239,68,68,.15); color: #f87171; }