:root{
  --primary:#2563eb; --primary-dark:#1e40af; --primary-light:#dbeafe;
  --sidebar:#0f172a; --sidebar-hover:#1e293b;
  --bg:#f1f5f9; --card:#ffffff; --text:#1e293b; --muted:#64748b;
  --border:#e2e8f0; --success:#16a34a; --danger:#dc2626; --warning:#d97706;
  --radius:12px; --shadow:0 1px 3px rgba(0,0,0,.08),0 1px 2px rgba(0,0,0,.06);
}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:'Segoe UI',system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--text);line-height:1.5}
a{text-decoration:none;color:inherit}

/* ---------- LAYOUT ---------- */
.layout{display:flex;min-height:100vh}
.sidebar{width:260px;background:var(--sidebar);color:#cbd5e1;position:fixed;height:100vh;overflow-y:auto;transition:.3s;z-index:1000}
.sidebar-brand{padding:20px;font-size:1.15rem;font-weight:700;color:#fff;border-bottom:1px solid #1e293b;display:flex;align-items:center;gap:10px}
.sidebar-brand span{font-size:1.6rem}
.sidebar-menu{padding:12px 0;list-style:none}
.sidebar-menu .menu-title{padding:14px 20px 6px;font-size:.7rem;text-transform:uppercase;letter-spacing:.5px;color:#64748b}
.sidebar-menu a{display:flex;align-items:center;gap:12px;padding:11px 20px;font-size:.9rem;transition:.2s;border-left:3px solid transparent}
.sidebar-menu a:hover{background:var(--sidebar-hover);color:#fff}
.sidebar-menu a.active{background:var(--sidebar-hover);color:#fff;border-left-color:var(--primary)}
.sidebar-menu a i{width:20px;text-align:center}

.main{flex:1;margin-left:260px;transition:.3s;min-width:0}
.topbar{background:var(--card);padding:14px 24px;display:flex;align-items:center;justify-content:space-between;box-shadow:var(--shadow);position:sticky;top:0;z-index:900}
.topbar-left{display:flex;align-items:center;gap:14px}
.menu-toggle{background:none;border:none;font-size:1.4rem;cursor:pointer;color:var(--text);display:none}
.topbar h1{font-size:1.1rem;font-weight:600}
.user-box{display:flex;align-items:center;gap:10px}
.user-avatar{width:38px;height:38px;border-radius:50%;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:600}
.user-info{text-align:right}
.user-info .name{font-size:.85rem;font-weight:600}
.user-info .role{font-size:.72rem;color:var(--muted)}
.content{padding:24px}

/* ---------- CARDS / STATS ---------- */
.stats-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:18px;margin-bottom:24px}
.stat-card{background:var(--card);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow);display:flex;align-items:center;gap:16px}
.stat-icon{width:52px;height:52px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:1.5rem;background:var(--primary-light);color:var(--primary)}
.stat-card .val{font-size:1.7rem;font-weight:700;line-height:1}
.stat-card .lbl{font-size:.82rem;color:var(--muted);margin-top:4px}

.card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);margin-bottom:20px}
.card-header{padding:16px 20px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:10px}
.card-header h2{font-size:1rem;font-weight:600}
.card-body{padding:20px}

/* ---------- TABLE ---------- */
.table-wrap{overflow-x:auto}
table{width:100%;border-collapse:collapse;font-size:.88rem;min-width:520px}
th,td{padding:11px 14px;text-align:left;border-bottom:1px solid var(--border)}
th{background:#f8fafc;font-weight:600;color:var(--muted);font-size:.78rem;text-transform:uppercase;letter-spacing:.3px}
tbody tr:hover{background:#f8fafc}

/* ---------- BADGE ---------- */
.badge{display:inline-block;padding:3px 10px;border-radius:20px;font-size:.72rem;font-weight:600}
.badge-success{background:#dcfce7;color:var(--success)}
.badge-danger{background:#fee2e2;color:var(--danger)}
.badge-warning{background:#fef3c7;color:var(--warning)}
.badge-info{background:var(--primary-light);color:var(--primary)}

/* ---------- BUTTONS ---------- */
.btn{display:inline-flex;align-items:center;gap:7px;padding:9px 16px;border:none;border-radius:8px;font-size:.85rem;font-weight:600;cursor:pointer;transition:.2s}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-dark)}
.btn-success{background:var(--success);color:#fff}
.btn-danger{background:var(--danger);color:#fff}
.btn-sm{padding:6px 11px;font-size:.78rem}
.btn-outline{background:transparent;border:1px solid var(--border);color:var(--text)}
.btn-outline:hover{background:#f8fafc}

/* ---------- FORMS ---------- */
.form-group{margin-bottom:16px}
.form-group label{display:block;font-size:.85rem;font-weight:600;margin-bottom:6px}
.form-control{width:100%;padding:10px 13px;border:1px solid var(--border);border-radius:8px;font-size:.9rem;font-family:inherit;transition:.2s}
.form-control:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-light)}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}

/* ---------- ALERT ---------- */
.alert{padding:12px 16px;border-radius:8px;margin-bottom:16px;font-size:.88rem}
.alert-success{background:#dcfce7;color:#166534;border:1px solid #bbf7d0}
.alert-danger{background:#fee2e2;color:#991b1b;border:1px solid #fecaca}

/* ---------- LOGIN ---------- */
.login-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#1e40af,#2563eb);padding:20px}
.login-box{background:#fff;border-radius:16px;box-shadow:0 20px 50px rgba(0,0,0,.2);width:100%;max-width:400px;padding:38px 32px}
.login-box .logo{text-align:center;margin-bottom:24px}
.login-box .logo .icon{font-size:2.6rem}
.login-box .logo h1{font-size:1.3rem;margin-top:8px}
.login-box .logo p{font-size:.82rem;color:var(--muted)}
.login-hint{margin-top:16px;font-size:.75rem;color:var(--muted);text-align:center;background:#f8fafc;padding:10px;border-radius:8px}

/* ---------- OVERLAY ---------- */
.overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,.4);z-index:999}
.overlay.show{display:block}

.actions{display:flex;gap:6px}
.page-title{font-size:1.3rem;margin-bottom:4px}
.page-sub{color:var(--muted);font-size:.85rem;margin-bottom:20px}

/* ---------- RESPONSIVE ---------- */
@media(max-width:992px){
  .sidebar{transform:translateX(-100%)}
  .sidebar.show{transform:translateX(0)}
  .main{margin-left:0}
  .menu-toggle{display:block}
}
@media(max-width:576px){
  .content{padding:16px}
  .form-row{grid-template-columns:1fr}
  .user-info{display:none}
  .topbar{padding:12px 16px}
  .stat-card{padding:16px}
}

/* ============ DRAG & DROP ============ */
.dnd-hint{font-size:.8rem;color:var(--muted);margin-bottom:14px;display:flex;align-items:center;gap:6px}

/* Kanban */
.kanban{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.kanban-col{background:#f8fafc;border-radius:var(--radius);padding:14px;min-height:200px}
.kanban-col h3{font-size:.85rem;text-transform:uppercase;letter-spacing:.4px;margin-bottom:12px;color:var(--muted);display:flex;justify-content:space-between}
.kanban-col.drop-over{background:var(--primary-light);outline:2px dashed var(--primary)}
.kanban-card{background:#fff;border:1px solid var(--border);border-radius:10px;padding:12px;margin-bottom:10px;cursor:grab;box-shadow:var(--shadow);transition:.15s}
.kanban-card:active{cursor:grabbing}
.kanban-card.dragging{opacity:.4}
.kanban-card strong{font-size:.9rem;display:block}
.kanban-card p{font-size:.8rem;color:var(--muted);margin-top:4px}
.kanban-card .del{float:right;color:var(--danger);cursor:pointer;font-size:.85rem}
.col-todo h3{color:#d97706} .col-proses h3{color:var(--primary)} .col-selesai h3{color:var(--success)}

/* Sortable list (ATP) */
.sortable{list-style:none}
.sortable li{background:#fff;border:1px solid var(--border);border-radius:10px;padding:12px 14px;margin-bottom:8px;display:flex;align-items:center;gap:12px;cursor:grab;box-shadow:var(--shadow)}
.sortable li.dragging{opacity:.4}
.sortable li.drop-over{border-color:var(--primary);border-style:dashed}
.sortable .grip{color:var(--muted);font-size:1.1rem}
.sortable .num{width:26px;height:26px;background:var(--primary-light);color:var(--primary);border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.8rem;flex-shrink:0}
.sortable .body{flex:1;min-width:0}
.sortable .body b{font-size:.9rem}
.sortable .body small{color:var(--muted);font-size:.78rem}

/* Denah kelas */
.denah-wrap{display:flex;gap:20px;flex-wrap:wrap}
.denah-grid{flex:1;min-width:300px}
.papan{background:var(--sidebar);color:#fff;text-align:center;padding:8px;border-radius:8px;margin-bottom:16px;font-size:.8rem;letter-spacing:1px}
.seat-grid{display:grid;gap:10px}
.seat{background:#f8fafc;border:2px dashed var(--border);border-radius:10px;min-height:64px;display:flex;align-items:center;justify-content:center;padding:6px;text-align:center;font-size:.8rem;transition:.15s}
.seat.filled{background:var(--primary-light);border-style:solid;border-color:var(--primary);cursor:grab}
.seat.drop-over{background:#dbeafe;border-color:var(--primary)}
.seat.dragging{opacity:.4}
.siswa-pool{width:220px;background:#f8fafc;border-radius:var(--radius);padding:14px;max-height:500px;overflow-y:auto}
.siswa-pool h4{font-size:.8rem;text-transform:uppercase;color:var(--muted);margin-bottom:10px}
.pool-item{background:#fff;border:1px solid var(--border);border-radius:8px;padding:8px 10px;margin-bottom:6px;font-size:.82rem;cursor:grab}
.pool-item.dragging{opacity:.4}

/* Dropzone upload */
.dropzone{border:2px dashed var(--border);border-radius:var(--radius);padding:30px;text-align:center;color:var(--muted);cursor:pointer;transition:.15s;background:#f8fafc}
.dropzone.drop-over{border-color:var(--primary);background:var(--primary-light);color:var(--primary)}
.dropzone .icon{font-size:2rem}
.dropzone .fname{margin-top:8px;font-weight:600;color:var(--text)}

/* ============ AI PANEL ============ */
.ai-badge{display:inline-flex;align-items:center;gap:5px;background:linear-gradient(135deg,#7c3aed,#2563eb);color:#fff;padding:3px 10px;border-radius:20px;font-size:.72rem;font-weight:600}
.btn-ai{background:linear-gradient(135deg,#7c3aed,#2563eb);color:#fff}
.btn-ai:hover{filter:brightness(1.08)}
.ai-panel{border:1px solid #e9d5ff;background:linear-gradient(180deg,#faf5ff,#fff);border-radius:var(--radius);padding:18px;margin-top:16px}
.ai-result{background:#fff;border:1px solid var(--border);border-radius:10px;padding:16px;margin-top:14px;white-space:pre-wrap;font-size:.9rem;line-height:1.65;max-height:520px;overflow-y:auto}
.ai-loading{display:flex;align-items:center;gap:10px;color:var(--primary);font-size:.9rem;padding:10px 0}
.spinner{width:18px;height:18px;border:3px solid var(--primary-light);border-top-color:var(--primary);border-radius:50%;animation:spin .7s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

@media(max-width:768px){
  .kanban{grid-template-columns:1fr}
  .denah-wrap{flex-direction:column}
  .siswa-pool{width:100%}
}