@import url('https://fonts.googleapis.com/css2?family=DM+Serif+Display&family=DM+Sans:wght@400;500;600;700&display=swap');
:root{--bg:#F5F3EE;--card:#fff;--primary:#2D5A3D;--primary-light:#4A8B5C;--primary-pale:#E8F0EA;--primary-dark:#1A3A26;
  --accent:#D4A843;--accent-light:#F5EDD4;--danger:#C0392B;--danger-light:#FADBD8;
  --text:#2C2C2C;--text-light:#6B6B6B;--text-muted:#999;--border:#E0DCD4;--border-dark:#B8B0A2;
  --shadow:0 2px 12px rgba(0,0,0,.06);--shadow-lg:0 8px 32px rgba(0,0,0,.1);
  --desk-bg:#D4C9A8;--desk-border:#A69B7B;--radius:12px;--radius-lg:16px;
  --font:'DM Serif Display',Georgia,serif;--font-sans:'DM Sans','Segoe UI',system-ui,sans-serif;--tr:.2s ease}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px;scroll-behavior:smooth}body{font-family:var(--font-sans);background:var(--bg);color:var(--text);line-height:1.6;min-height:100vh}
a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}img{max-width:100%}button{font-family:var(--font-sans)}

.app-layout{display:flex;min-height:100vh}
.sidebar{width:260px;background:var(--primary);color:#fff;display:flex;flex-direction:column;flex-shrink:0;position:sticky;top:0;height:100vh;overflow-y:auto;z-index:100}
.sidebar-header{padding:24px 20px 16px;border-bottom:1px solid rgba(255,255,255,.12)}.sidebar-header h1{font-family:var(--font);font-size:22px}
.sidebar-header .user-info{font-size:13px;opacity:.75;margin-top:6px}
.sidebar-header .role-badge{display:inline-block;font-size:10px;background:rgba(255,255,255,.18);padding:2px 8px;border-radius:4px;margin-top:4px;font-weight:600;text-transform:uppercase}
.sidebar-nav{flex:1;padding:12px 0}
.sidebar-nav .nav-item{display:flex;align-items:center;gap:12px;padding:11px 20px;cursor:pointer;font-size:14px;font-weight:500;border-left:3px solid transparent;transition:all var(--tr);color:rgba(255,255,255,.85)}
.sidebar-nav .nav-item:hover{background:rgba(255,255,255,.08);color:#fff}
.sidebar-nav .nav-item.active{background:rgba(255,255,255,.14);border-left-color:var(--accent);color:#fff;font-weight:600}
.sidebar-nav .nav-divider{height:1px;background:rgba(255,255,255,.1);margin:8px 16px}
.sidebar-footer{padding:16px 20px;border-top:1px solid rgba(255,255,255,.12)}
.sidebar-footer .nav-item{padding:8px 0;border-left:none;cursor:pointer}
.main-content{flex:1;display:flex;flex-direction:column;min-width:0}
.content-area{flex:1;padding:32px;max-width:1200px;width:100%;margin:0 auto}
.page-header{margin-bottom:24px}.page-header h2{font-family:var(--font);color:var(--primary);font-size:28px;margin-bottom:4px}
.page-header p{color:var(--text-light);font-size:14px}

/* Fullscreen mode */
.fullscreen-mode .sidebar,.fullscreen-mode .app-footer,.fullscreen-mode .no-print,.fullscreen-mode .page-header{display:none!important}
.fullscreen-mode .content-area{padding:8px;max-width:none;display:flex;align-items:center;justify-content:center;min-height:100vh}
.fullscreen-mode .card{box-shadow:none;border:none;padding:8px;width:100%}
.fullscreen-mode .desk-grid-wrap{padding:0;margin:0}
.fullscreen-mode .desk-grid{transform-origin:center center}
.fullscreen-mode .student-list,.fullscreen-mode .card.mt-20{display:none!important}
.fs-exit{position:fixed;top:12px;right:12px;width:36px;height:36px;border-radius:50%;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:center;cursor:pointer;z-index:9999;box-shadow:var(--shadow-lg);opacity:.5;transition:opacity .2s}.fs-exit:hover{opacity:1}

.card{background:var(--card);border-radius:var(--radius-lg);padding:24px;box-shadow:var(--shadow);border:1px solid var(--border)}
.card-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}
.card-header h3{font-family:var(--font);color:var(--primary);font-size:18px}

.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 20px;border-radius:8px;border:none;cursor:pointer;font-weight:600;font-size:14px;transition:all var(--tr);white-space:nowrap;line-height:1.4}
.btn:hover{transform:translateY(-1px);box-shadow:0 4px 12px rgba(0,0,0,.1)}.btn:active{transform:translateY(0)}
.btn:disabled{opacity:.5;cursor:not-allowed;transform:none}
.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-light)}
.btn-accent{background:var(--accent);color:#fff}.btn-danger{background:var(--danger);color:#fff}
.btn-ghost{background:transparent;color:var(--primary);border:2px solid var(--primary)}.btn-ghost:hover{background:var(--primary-pale)}
.btn-secondary{background:var(--primary-pale);color:var(--primary)}
.btn-sm{padding:6px 14px;font-size:13px}.btn-xs{padding:3px 8px;font-size:11px;border-radius:6px}
.btn-group{display:flex;gap:8px;flex-wrap:wrap}

.form-group{margin-bottom:16px}.form-group label,.form-label{display:block;font-size:13px;font-weight:600;color:var(--text-light);margin-bottom:6px}
.form-control{width:100%;padding:10px 14px;border-radius:8px;border:2px solid var(--border);font-family:var(--font-sans);font-size:14px;outline:none;transition:border-color var(--tr);background:#fff}
.form-control:focus{border-color:var(--primary)}select.form-control{cursor:pointer}textarea.form-control{resize:vertical;min-height:80px}
.form-row{display:flex;gap:12px}.form-row>*{flex:1}
.form-check{display:flex;align-items:center;gap:8px;font-size:14px;cursor:pointer}
.form-check input[type="checkbox"]{width:18px;height:18px;accent-color:var(--primary);cursor:pointer}
.form-hint{font-size:12px;color:var(--text-muted);margin-top:4px}

.badge{display:inline-block;padding:3px 10px;border-radius:12px;font-size:12px;font-weight:600}
.badge-success{background:var(--primary-pale);color:var(--primary)}.badge-warning{background:var(--accent-light);color:#8B6914}
.badge-danger{background:var(--danger-light);color:var(--danger)}.badge-muted{background:var(--bg);color:var(--text-light)}

/* ===== DESK GRID ===== */
.desk-grid-wrap{overflow-x:auto;overflow-y:visible;-webkit-overflow-scrolling:touch;padding:16px 8px 20px;margin:-8px}
.desk-grid{display:flex;flex-direction:column;align-items:center;gap:6px;min-width:min-content}
.desk-element{border-radius:0;font-size:13px;font-weight:600;text-align:center;box-sizing:border-box}
/* Board: 6 cells = 264px, Pult: 4 cells = 176px */
.desk-element.board{background:var(--border-dark);border:2px solid var(--desk-border);color:var(--text);padding:2px 0;font-size:11px;width:264px}
.desk-element.teacher-desk{background:var(--desk-bg);border:2px solid var(--desk-border);color:var(--text);padding:8px 0;width:176px}
.desk-rows{display:flex;flex-direction:column;gap:var(--row-gap,0px);padding:8px 0}
.desk-row{display:flex;gap:var(--col-gap,0px);justify-content:center;align-items:stretch}
.desk{background:var(--desk-bg);border:2px solid var(--desk-border);border-radius:0;padding:6px;display:flex;gap:6px;justify-content:center;align-items:center;width:88px;height:88px;flex-shrink:0;box-sizing:border-box}
.desk.double{width:176px}

.seat{width:52px;height:52px;border-radius:50%;border:2px solid var(--border-dark);background:var(--border);display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all var(--tr);position:relative;overflow:hidden;font-size:11px;color:var(--text-light);flex-shrink:0}
.seat:hover{border-color:var(--primary);transform:scale(1.05)}
.seat.filled{border-color:var(--primary);background:var(--primary);color:#fff;font-weight:700}
.seat.filled.has-photo{background-size:cover;background-position:center;color:transparent}
.seat.locked{opacity:.6;cursor:not-allowed}.seat .seat-num{font-size:10px}
.seat .seat-text{font-size:9px;line-height:1.1;text-align:center;padding:1px 2px;word-break:break-all;max-height:100%;overflow:hidden;color:#fff}
.seat.name-only{background:var(--primary)}.seat.name-only .seat-text{font-size:10px;font-weight:700}
/* Name-only without circle: just text (two-line for V+N) */
.seat-name-flat{font-size:13px;font-weight:700;color:var(--text);text-align:center;padding:6px 4px;min-width:60px;display:flex;flex-direction:column;align-items:center;justify-content:center;cursor:pointer;transition:all var(--tr);line-height:1.2}
.seat-name-flat:hover{color:var(--primary)}
.seat-name-flat div{max-width:80px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
/* Empty seat in name-only mode: just number, no circle */
.seat-num-flat{font-size:11px;color:var(--text-muted);cursor:pointer;text-align:center;padding:4px}

.seat-wrap{display:flex;flex-direction:column;align-items:center;gap:2px;position:relative;width:76px;flex-shrink:0}
.seat-label{font-size:11px;font-weight:600;color:var(--text);text-align:center;max-width:76px;overflow:hidden;white-space:nowrap;text-overflow:ellipsis;line-height:1.3}
.seat-label.seat-label-2l{white-space:normal;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;line-height:1.15;font-size:10px;max-height:2.4em}
.seat-delete{position:absolute;top:-4px;right:-4px;width:16px;height:16px;border-radius:50%;background:var(--danger);color:#fff;font-size:10px;display:flex;align-items:center;justify-content:center;cursor:pointer;z-index:5;border:1px solid #fff;line-height:1;opacity:0;transition:opacity .15s}
.seat-wrap:hover .seat-delete{opacity:1}
.seat.dragging{opacity:.4;transform:scale(.9)}
.seat.drag-over,.seat-name-flat.drag-over{border-color:var(--accent);box-shadow:0 0 12px rgba(212,168,67,.4)}
.park-zone{min-height:60px;border:2px dashed var(--border-dark);border-radius:12px;padding:8px;display:flex;flex-wrap:wrap;gap:8px;align-items:center;justify-content:center;margin-top:12px;background:rgba(0,0,0,.02)}
.park-zone.drag-over{border-color:var(--accent);background:var(--accent-light)}
.park-zone-label{font-size:11px;color:var(--text-muted);width:100%;text-align:center}

/* Desk arrangement editor */
.da-container{user-select:none;margin:0 auto}
.da-desk{position:absolute;background:var(--desk-bg);border:2px solid var(--desk-border);border-radius:0;cursor:grab;display:flex;align-items:center;justify-content:center;z-index:2;transition:box-shadow .15s}
.da-desk:hover{box-shadow:0 0 0 3px var(--primary-light);z-index:3}
.da-desk:active{cursor:grabbing}
.da-seat-num{font-size:13px;font-weight:700;color:var(--text);pointer-events:none}
.da-split{position:absolute;top:-8px;right:-8px;width:20px;height:20px;border-radius:50%;background:var(--accent);color:#fff;font-size:12px;display:flex;align-items:center;justify-content:center;cursor:pointer;z-index:5;border:2px solid #fff;line-height:1}
.da-split:hover{transform:scale(1.2)}
.da-merge{position:absolute;width:20px;height:20px;border-radius:50%;background:var(--primary);color:#fff;font-size:12px;display:flex;align-items:center;justify-content:center;cursor:pointer;z-index:5;border:2px solid #fff;line-height:1}
.da-merge:hover{transform:scale(1.2)}
.desk-grid-sm .desk-rows{gap:4px;padding:4px 0}.desk-grid-sm .desk-row{gap:4px}
.desk-grid-sm .desk{padding:3px;gap:3px;width:36px;height:28px;border-radius:0;border-width:1px}
.desk-grid-sm .desk.double{width:68px}
.desk-grid-sm .seat{width:22px;height:22px;font-size:7px;border-width:1px}
.desk-grid-sm .desk-element{padding:2px 10px;font-size:8px;border-radius:0}

.plan-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:16px}
.plan-card{cursor:pointer;transition:all var(--tr);position:relative}.plan-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg)}
.plan-card .plan-title{font-family:var(--font);font-size:20px;color:var(--primary)}
.plan-card .plan-subtitle{font-size:13px;color:var(--text-light);margin-top:2px}
.plan-card .plan-preview{margin:12px 0;overflow:hidden;max-height:120px;transform:scale(.55);transform-origin:top center}
.plan-card .plan-meta{display:flex;justify-content:space-between;font-size:12px;color:var(--text-light);padding-top:8px;border-top:1px solid var(--border)}
.plan-card .plan-top{display:flex;justify-content:space-between;align-items:flex-start}
.plan-card .plan-top-actions{display:flex;gap:4px;margin-top:4px;opacity:0;transition:opacity .15s}
.plan-card:hover .plan-top-actions{opacity:1}

.display-toggle{display:inline-flex;border:2px solid var(--border);border-radius:8px;overflow:hidden;flex-wrap:wrap}
.display-toggle button{padding:4px 8px;border:none;background:#fff;cursor:pointer;font-size:10px;font-weight:600;color:var(--text-light);transition:all .15s}
.display-toggle button.active{background:var(--primary);color:#fff}
.display-toggle button:hover:not(.active){background:var(--primary-pale)}

.student-list{display:flex;flex-wrap:wrap;gap:8px}
.student-chip{display:flex;align-items:center;gap:8px;background:var(--bg);border:1px solid var(--border);border-radius:10px;padding:6px 12px;cursor:pointer;transition:all var(--tr)}
.student-chip:hover{border-color:var(--primary);background:var(--primary-pale)}
.student-avatar{width:36px;height:36px;border-radius:50%;border:2px solid var(--primary);background:var(--primary);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:12px;overflow:hidden;flex-shrink:0}
.student-avatar img{width:100%;height:100%;object-fit:cover}
.student-avatar-lg{width:140px;height:140px;border-radius:50%;border:4px solid var(--primary);background:var(--primary);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:48px;overflow:hidden;margin:0 auto}
.student-avatar-lg img{width:100%;height:100%;object-fit:cover}

.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.5);backdrop-filter:blur(4px);z-index:1000;display:flex;align-items:center;justify-content:center;padding:20px;animation:fadeIn .2s}
.modal{background:var(--card);border-radius:var(--radius-lg);padding:28px;max-width:560px;width:100%;max-height:90vh;overflow-y:auto;box-shadow:var(--shadow-lg);animation:slideUp .3s}
.modal.modal-wide{max-width:800px}
.modal-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px}
.modal-header h3{font-family:var(--font);color:var(--primary);font-size:20px}
.modal-close{background:none;border:none;cursor:pointer;padding:4px;color:var(--text-light);font-size:20px;line-height:1}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}@keyframes slideUp{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}
.toast-container{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);z-index:9999}
.toast{padding:12px 24px;border-radius:12px;font-weight:600;font-size:14px;box-shadow:var(--shadow-lg);animation:slideUp .3s;white-space:nowrap}
.toast-success{background:var(--primary);color:#fff}.toast-error{background:var(--danger);color:#fff}

.auth-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--primary),var(--primary-light)50%,var(--accent));padding:20px}
.auth-card{max-width:440px;width:100%;text-align:center}
.auth-logo{width:68px;height:68px;border-radius:50%;background:var(--primary-pale);display:flex;align-items:center;justify-content:center;margin:0 auto 16px}
.auth-card h1{font-family:var(--font);color:var(--primary);font-size:30px;margin-bottom:4px}
.auth-card .subtitle{color:var(--text-light);font-size:14px;margin-bottom:28px}

.learning-card{max-width:500px;margin:0 auto;text-align:center}.learning-progress{font-size:13px;color:var(--text-light);margin-bottom:16px}
.learning-choices{display:grid;gap:12px;justify-items:center;margin:20px 0}
.learning-choice{cursor:pointer;border-radius:50%;border:4px solid transparent;transition:all var(--tr)}
.learning-choice:hover{border-color:var(--primary-light);transform:scale(1.05)}
.learning-choice.correct{border-color:var(--primary)}.learning-choice.wrong{border-color:var(--danger);opacity:.4}
.learning-choice-text{cursor:pointer;padding:12px 20px;border:2px solid var(--border);border-radius:10px;font-size:16px;font-weight:600;transition:all var(--tr)}
.learning-choice-text:hover{border-color:var(--primary);background:var(--primary-pale)}
.learning-choice-text.correct{border-color:var(--primary);background:var(--primary-pale)}
.learning-choice-text.wrong{border-color:var(--danger);background:var(--danger-light);opacity:.5}
.learning-result{font-size:20px;font-weight:700;margin:12px 0}
.learning-result.correct{color:var(--primary)}.learning-result.wrong{color:var(--danger)}

.data-table{width:100%;border-collapse:collapse;font-size:14px}
.data-table th{text-align:left;padding:10px 12px;font-size:12px;font-weight:600;color:var(--text-light);text-transform:uppercase;border-bottom:2px solid var(--border)}
.data-table td{padding:12px;border-bottom:1px solid var(--border);vertical-middle}
.data-table tr:hover td{background:var(--bg)}
.tier-row{display:flex;align-items:center;gap:8px;margin-bottom:8px}.tier-row .form-control{width:100px}.tier-row span{font-size:13px;white-space:nowrap}
.tier-row .tier-del{cursor:pointer;color:var(--danger);font-size:16px;font-weight:700}

.app-footer{background:var(--primary-dark);color:rgba(255,255,255,.65);padding:16px 32px;font-size:12px;display:flex;justify-content:space-between;align-items:center}
.app-footer a{color:rgba(255,255,255,.8);text-decoration:underline;margin-left:16px}.app-footer a:hover{color:#fff}

.flex{display:flex}.flex-col{flex-direction:column}.flex-center{align-items:center;justify-content:center}
.flex-between{justify-content:space-between}.flex-wrap{flex-wrap:wrap}
.gap-4{gap:4px}.gap-8{gap:8px}.gap-12{gap:12px}.gap-16{gap:16px}.gap-20{gap:20px}
.text-center{text-align:center}.text-muted{color:var(--text-light)}.text-sm{font-size:13px}.text-xs{font-size:11px}
.mt-4{margin-top:4px}.mt-8{margin-top:8px}.mt-12{margin-top:12px}.mt-16{margin-top:16px}.mt-20{margin-top:20px}
.mb-8{margin-bottom:8px}.mb-12{margin-bottom:12px}.mb-16{margin-bottom:16px}
.w-full{width:100%}.hidden{display:none!important}.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.empty-state{text-align:center;padding:48px 24px;color:var(--text-light)}
.spinner{width:32px;height:32px;border:3px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin .6s linear infinite;margin:20px auto}
@keyframes spin{to{transform:rotate(360deg)}}
@media(max-width:900px){.sidebar{width:220px}.content-area{padding:20px}.grid-2{grid-template-columns:1fr}}
@media(max-width:700px){.app-layout{flex-direction:column}.sidebar{width:100%;height:auto;position:relative;flex-direction:row;overflow-x:auto}
  .sidebar-header{padding:12px 16px;white-space:nowrap}.sidebar-header h1{font-size:18px}.sidebar-header .user-info,.sidebar-header .role-badge{display:none}
  .sidebar-nav{display:flex;padding:0}.sidebar-nav .nav-item{padding:12px 14px;font-size:12px;border-left:none;border-bottom:3px solid transparent;white-space:nowrap}
  .sidebar-nav .nav-item.active{border-bottom-color:var(--accent)}.sidebar-nav .nav-item svg{display:none}.sidebar-nav .nav-divider{display:none}
  .sidebar-footer{display:none}.content-area{padding:16px}.plan-grid{grid-template-columns:1fr}.form-row{flex-direction:column}.modal{padding:20px;margin:10px}}
@media print{.sidebar,.app-footer,.btn,.no-print{display:none!important}.main-content{margin:0}.content-area{padding:0;max-width:none}
  .card{box-shadow:none;border:1px solid #ccc;break-inside:avoid}}