:root{
    --bg:#FAF6F1;
    --surface:#FFFFFF;
    --surface-alt:#F3EAE2;
    --primary:#6B2737;
    --primary-dark:#4F1C29;
    --primary-soft:#F3E2E6;
    --accent:#C9A227;
    --accent-soft:#FBF3DC;
    --text:#2B1F24;
    --text-soft:#8A7B80;
    --border:#E9DFD6;
    --success:#4F7942;
    --success-bg:#E8F0E3;
    --warning:#B8860B;
    --warning-bg:#FBF3DC;
    --danger:#B33A3A;
    --danger-bg:#FBE8E6;
    --info:#4F6C8A;
    --info-bg:#E8EEF3;
    --radius-sm:8px;
    --radius:14px;
    --radius-lg:20px;
    --shadow:0 2px 10px rgba(43,31,36,0.06);
    --shadow-md:0 10px 30px rgba(43,31,36,0.12);
  }
  *{box-sizing:border-box;}
  html,body{margin:0;padding:0;}
  body{
    background:var(--bg);
    color:var(--text);
    font-family:'Poppins',sans-serif;
    -webkit-font-smoothing:antialiased;
  }
  h1,h2,h3,.display{font-family:'Poppins',sans-serif;}
  button{font-family:inherit;}
  ::selection{background:var(--accent-soft);}

  #shell{display:flex;min-height:100vh;}

  /* SIDEBAR */
  #sidebar{
    width:228px;flex-shrink:0;background:var(--primary);
    color:#fff;display:flex;flex-direction:column;padding:28px 16px;
    position:sticky;top:0;height:100vh;
  }
  .brand{display:flex;align-items:center;gap:10px;padding:0 10px 28px 10px;}
  .brand-mark{
    width:34px;height:34px;border-radius:10px;background:rgba(255,255,255,0.14);
    display:flex;align-items:center;justify-content:center;font-weight:700;font-size:16px;
    color:#fff;flex-shrink:0;
  }
  .brand-text .t1{font-family:'Poppins',sans-serif;font-weight:600;font-size:19px;line-height:1.1;color:#fff;}
  .brand-text .t2{font-size:11px;color:rgba(255,255,255,0.6);letter-spacing:.04em;}
  .nav{display:flex;flex-direction:column;gap:4px;margin-top:8px;}
  .nav-item{
    display:flex;align-items:center;gap:12px;padding:11px 12px;border-radius:10px;
    color:rgba(255,255,255,0.78);cursor:pointer;font-size:14.5px;font-weight:500;
    border:none;background:transparent;text-align:left;width:100%;transition:background .15s,color .15s;
  }
  .nav-item svg{flex-shrink:0;opacity:.85;}
  .nav-item:hover{background:rgba(255,255,255,0.08);color:#fff;}
  .nav-item.active{background:rgba(255,255,255,0.16);color:#fff;}
  .sidebar-foot{margin-top:auto;padding:10px;font-size:11.5px;color:rgba(255,255,255,0.45);line-height:1.5;}

  /* MAIN */
  #main{flex:1;min-width:0;padding:32px 36px 80px;max-width:1180px;}
  .page-head{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:24px;flex-wrap:wrap;}
  .page-head h1{font-size:27px;margin:0 0 4px;font-weight:600;}
  .page-sub{color:var(--text-soft);font-size:14px;margin:0;}
  .btn{
    display:inline-flex;align-items:center;gap:7px;border:none;border-radius:10px;
    padding:10px 16px;font-size:14px;font-weight:600;cursor:pointer;transition:transform .08s, box-shadow .15s, background .15s;
    white-space:nowrap;
  }
  .btn:active{transform:scale(0.97);}
  .btn-primary{background:var(--primary);color:#fff;}
  .btn-primary:hover{background:var(--primary-dark);}
  .btn-ghost{background:var(--surface-alt);color:var(--text);}
  .btn-ghost:hover{background:#EBDFD3;}
  .btn-outline{background:transparent;color:var(--primary);border:1.5px solid var(--primary-soft);}
  .btn-outline:hover{background:var(--primary-soft);}
  .btn-sm{padding:6px 11px;font-size:12.5px;border-radius:8px;}
  .btn-icon{padding:7px;border-radius:8px;}
  .btn[disabled]{opacity:.45;cursor:not-allowed;}

  /* CARDS / GRID */
  .grid{display:grid;gap:18px;}
  .grid-dash{grid-template-columns:repeat(12,1fr);}
  .card{
    background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
    padding:20px;box-shadow:var(--shadow);
  }
  .card-title{display:flex;align-items:center;justify-content:space-between;margin-bottom:14px;}
  .card-title h3{font-size:15px;margin:0;font-weight:600;display:flex;align-items:center;gap:8px;}
  .card-title h3 svg{opacity:.6;}
  .stat-card .value{font-family:'Poppins',sans-serif;font-size:34px;font-weight:600;line-height:1;margin:4px 0 2px;}
  .stat-card .label{font-size:12.5px;color:var(--text-soft);}
  .stat-select{font-size:12px;border:1px solid var(--border);border-radius:7px;padding:3px 6px;background:var(--surface-alt);color:var(--text);}

  .empty{color:var(--text-soft);font-size:13.5px;padding:14px 4px;text-align:center;}

  /* LIST ROWS */
  .row-item{
    display:flex;align-items:center;gap:12px;padding:10px 8px;border-radius:10px;
  }
  .row-item:hover{background:var(--surface-alt);}
  .avatar{
    width:34px;height:34px;border-radius:50%;background:var(--primary-soft);color:var(--primary-dark);
    display:flex;align-items:center;justify-content:center;font-weight:700;font-size:13px;flex-shrink:0;font-family:'Poppins',sans-serif;
  }
  .row-main{flex:1;min-width:0;}
  .row-main .name{font-weight:600;font-size:13.8px;}
  .row-main .sub{font-size:12px;color:var(--text-soft);margin-top:1px;}
  .row-actions{display:flex;gap:6px;flex-shrink:0;}

  .badge{
    display:inline-flex;align-items:center;gap:4px;font-size:11px;font-weight:700;
    padding:3px 9px;border-radius:99px;letter-spacing:.01em;
  }
  .badge-success{background:var(--success-bg);color:var(--success);}
  .badge-warning{background:var(--warning-bg);color:var(--warning);}
  .badge-danger{background:var(--danger-bg);color:var(--danger);}
  .badge-info{background:var(--info-bg);color:var(--info);}
  .badge-neutral{background:var(--surface-alt);color:var(--text-soft);}

  /* TABLE */
  table{width:100%;border-collapse:collapse;font-size:13.5px;}
  th{text-align:left;font-size:11.5px;text-transform:uppercase;letter-spacing:.04em;color:var(--text-soft);padding:8px 10px;border-bottom:1px solid var(--border);}
  td{padding:10px 10px;border-bottom:1px solid var(--border);}
  tr:last-child td{border-bottom:none;}
  td.num{font-variant-numeric:tabular-nums;}

  /* SECTION (alunos / agenda) */
  .section-row{display:flex;gap:20px;align-items:flex-start;flex-wrap:wrap;}
  .col{flex:1;min-width:300px;}

  .search-box{
    display:flex;align-items:center;gap:8px;background:var(--surface);border:1px solid var(--border);
    border-radius:10px;padding:8px 12px;margin-bottom:14px;
  }
  .search-box input{border:none;outline:none;font-size:14px;flex:1;background:transparent;color:var(--text);font-family:inherit;}

  /* FORMS */
  .field{margin-bottom:14px;}
  .field label{display:block;font-size:12.5px;font-weight:600;color:var(--text-soft);margin-bottom:5px;}
  .field input,.field select,.field textarea{
    width:100%;padding:9px 11px;border:1.5px solid var(--border);border-radius:9px;font-size:14px;
    font-family:inherit;color:var(--text);background:var(--surface);
  }
  .field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--primary);}
  .field-row{display:flex;gap:12px;}
  .field-row .field{flex:1;}
  .checkrow{display:flex;align-items:center;gap:8px;font-size:13.5px;margin-bottom:14px;}
  .checkrow input{width:auto;}
  .hint{font-size:11.5px;color:var(--text-soft);margin-top:4px;}

  /* MODAL */
  .modal-overlay{
    position:fixed;inset:0;background:rgba(43,31,36,0.45);display:flex;align-items:center;justify-content:center;
    z-index:100;padding:20px;backdrop-filter:blur(2px);
  }
  .modal{
    background:var(--surface);border-radius:var(--radius-lg);padding:26px 26px 22px;width:100%;max-width:460px;
    box-shadow:var(--shadow-md);max-height:88vh;overflow-y:auto;
  }
  .modal h2{font-size:19px;margin:0 0 18px;font-weight:600;}
  .modal-foot{display:flex;justify-content:flex-end;gap:10px;margin-top:18px;}

  /* TOAST */
  #toast-root{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);z-index:200;display:flex;flex-direction:column;gap:8px;align-items:center;}
  .toast{background:var(--primary-dark);color:#fff;padding:10px 18px;border-radius:99px;font-size:13.5px;font-weight:500;box-shadow:var(--shadow-md);animation:toastin .2s ease;}
  @keyframes toastin{from{opacity:0;transform:translateY(8px);}to{opacity:1;transform:translateY(0);}}

  /* PROGRESS (equalizer) */
  .eq{display:flex;gap:3px;align-items:flex-end;height:20px;}
  .eq i{flex:1;display:block;background:var(--border);border-radius:2px;}
  .eq i.done{background:var(--success);}
  .eq i.last{background:var(--accent);}

  /* AGENDA */
  .agenda-nav{display:flex;align-items:center;gap:10px;margin-bottom:18px;}
  .agenda-range{font-weight:600;font-size:14.5px;min-width:190px;}
  .day-block{margin-bottom:22px;}
  .day-head{display:flex;align-items:baseline;gap:8px;margin-bottom:8px;padding-bottom:6px;border-bottom:1px solid var(--border);}
  .day-head .dow{font-family:'Poppins',sans-serif;font-weight:600;font-size:15.5px;}
  .day-head .dnum{font-size:12.5px;color:var(--text-soft);}
  .day-head .dtoday{color:var(--primary);}

  /* MONTH GRID */
  .month-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:6px;}
  .month-head-row{margin-bottom:6px;}
  .month-dow{font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.04em;color:var(--text-soft);text-align:center;padding:4px 0;}
  .month-cell{
    background:var(--surface);border:1px solid var(--border);border-radius:10px;
    min-height:96px;padding:6px;display:flex;flex-direction:column;gap:3px;
  }
  .month-cell.out{background:var(--surface-alt);opacity:.55;}
  .month-cell.today{border-color:var(--primary);box-shadow:0 0 0 1px var(--primary);}
  .month-cell-num{font-size:12px;font-weight:600;color:var(--text-soft);margin-bottom:2px;}
  .month-cell.today .month-cell-num{color:var(--primary);}
  .month-chip{
    font-size:10.5px;font-weight:600;padding:2px 6px;border-radius:6px;background:var(--info-bg);color:var(--info);
    white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
  }
  .month-chip.st-realizada{background:var(--success-bg);color:var(--success);}
  .month-chip.st-falta{background:var(--danger-bg);color:var(--danger);}
  .month-more{font-size:10px;color:var(--text-soft);padding:1px 6px;}
  @media (max-width:800px){ .month-cell{min-height:64px;} .month-dow{font-size:9.5px;} }
  .lesson-card{
    display:flex;align-items:center;gap:14px;padding:11px 12px;border-radius:10px;background:var(--surface);
    border:1px solid var(--border);border-left:4px solid var(--info);margin-bottom:8px;
  }
  .lesson-card.st-realizada{border-left-color:var(--success);}
  .lesson-card.st-falta{border-left-color:var(--danger);opacity:.75;}
  .lesson-time{font-weight:700;font-size:13.5px;width:48px;flex-shrink:0;font-variant-numeric:tabular-nums;}
  .lesson-main{flex:1;min-width:0;}
  .lesson-main .lname{font-weight:600;font-size:13.8px;}
  .lesson-main .lsub{font-size:11.8px;color:var(--text-soft);margin-top:1px;}
  .lesson-actions{display:flex;align-items:center;gap:6px;flex-shrink:0;}
  .status-select{font-size:12px;border:1.5px solid var(--border);border-radius:8px;padding:5px 8px;background:var(--surface-alt);color:var(--text);font-weight:600;}

  .back-link{display:inline-flex;align-items:center;gap:6px;color:var(--text-soft);font-size:13px;cursor:pointer;margin-bottom:14px;font-weight:600;border:none;background:none;padding:0;}
  .back-link:hover{color:var(--primary);}

  .tabs{display:flex;gap:4px;border-bottom:1px solid var(--border);margin-bottom:18px;}
  .tab{padding:9px 4px;margin-right:18px;font-size:13.5px;font-weight:600;color:var(--text-soft);cursor:pointer;border-bottom:2px solid transparent;margin-bottom:-1px;}
  .tab.active{color:var(--primary);border-bottom-color:var(--primary);}

  .student-head{display:flex;align-items:center;gap:14px;margin-bottom:6px;}
  .student-head .avatar{width:48px;height:48px;font-size:18px;}
  .student-head h1{margin:0;}

  @media(max-width:880px){
    #shell{flex-direction:column;}
    #sidebar{
      width:100%;height:auto;position:sticky;top:0;flex-direction:row;align-items:center;
      padding:12px 14px;z-index:50;
    }
    .brand{padding:0 8px 0 0;}
    .sidebar-foot{display:none;}
    .nav{flex-direction:row;margin-top:0;flex:1;justify-content:flex-end;}
    .nav-item span{display:none;}
    #main{padding:20px 16px 60px;}
    .section-row{flex-direction:column;}
    .grid-dash > *{grid-column:1 / -1 !important;}
    table{display:block;overflow-x:auto;-webkit-overflow-scrolling:touch;}
  }

  /* PHONES */
  @media(max-width:600px){
    #main{padding:16px 12px 56px;}
    .page-head h1{font-size:22px;}
    .brand-text .t2{display:none;}
    .nav-item{padding:9px 8px;}
    .modal{padding:20px 18px 18px;}
    .modal h2{font-size:17px;}
    .field-row{flex-direction:column;gap:0;}
    .agenda-nav{flex-wrap:wrap;row-gap:8px;}
    .agenda-range{min-width:0;font-size:13px;}
    .stat-card .value{font-size:26px;}
    .month-grid{gap:3px;}
    .month-cell{min-height:52px;padding:4px;border-radius:7px;}
    .month-cell-num{font-size:10.5px;}
    .month-chip{font-size:9px;padding:1px 4px;}
    .lesson-card{flex-wrap:wrap;}
    .modal-foot{flex-wrap:wrap;}
    .modal-foot .btn{flex:1;justify-content:center;}
  }