:root{
  --bg:#e9f0f3;
  --panel:#f1f5f7;
  --muted:#6b7d88;
  --accent: #294c62;
  --accent-2: #3f6978;
  --danger:#ff6b6b;
  --radius:12px;
  --shadow: 0 8px 30px rgba(20,30,40,0.08);
  font-family: Inter, "Segoe UI", Roboto, Arial, sans-serif;
}

/* ----- Alapok / háttér ----- */
* { box-sizing: border-box; }
html,body { height:100%; }
body {
  margin:0;
  background:
    repeating-linear-gradient(  -60deg,
      rgba(0,0,0,0.02) 0px,
      rgba(0,0,0,0.02) 1px,
      transparent 1px,
      transparent 28px
    ),
    repeating-linear-gradient(  30deg,
      rgba(0,0,0,0.01) 0px,
      rgba(0,0,0,0.01) 1px,
      transparent 1px,
      transparent 48px
    ),
    var(--bg);
  color:#253247;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  min-height:100vh;
}

/* ----- Topbar ----- */
.topbar{
  text-align:center;
  padding:36px 20px 10px;
}
.topbar h1{
  margin:0;
  font-size:30px;
  color:var(--accent);
  transform-origin:center;
  animation:fadeInDown .5s ease;
}
.topbar .subtitle{
  margin:6px 0 0;
  color:var(--muted);
  font-size:14px;
}

/* ----- Layout ----- */
.wrap{
  display:flex;
  gap:24px;
  padding:20px;
  max-width:1200px;
  margin:0 auto;
  align-items:flex-start;
}

/* ----- Sidebar / Panels ----- */
.sidebar{ width:300px; }
.panel{
  background: linear-gradient(180deg, rgba(255,255,255,0.8), var(--panel));
  padding:16px;
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  margin-bottom:18px;
  border: 1px solid rgba(41,76,98,0.04);
  animation:fadeIn .4s ease;
}
.panel h2{ margin:0 0 12px; font-size:16px; color:var(--accent); }
.tool-buttons{ display:flex; flex-direction:column; gap:8px; }

/* ----- Tool buttons (oldalsáv) ----- */
.tool{
  border:1px solid rgba(41,76,98,0.08);
  background:#fff;
  padding:10px;
  border-radius:8px;
  text-align:left;
  cursor:pointer;
  color:var(--accent);
  transition: transform .12s ease, box-shadow .12s ease, background .12s;
  font-size:14px;
}
.tool:hover{ transform:translateY(-4px); box-shadow:0 8px 20px rgba(20,30,40,0.06); }
.tool.active{ background:linear-gradient(90deg,var(--accent),var(--accent-2)); color:white; border-color:transparent; }

/* hint */
.hint{ margin-top:12px; color:var(--muted); font-size:13px; }
.hint .dot{ display:inline-block; width:10px; height:10px; border-radius:50%; margin-right:6px; vertical-align:middle; }
.hint .dot.single{ background:#18b38f; }
.hint .dot.double{ background:#3b82f6; }

/* ----- Custom input ----- */
.custom-input{
  padding:10px 12px;
  border-radius:12px;
  border:1px solid rgba(41,76,98,0.08);
  background:linear-gradient(180deg, #fff, rgba(255,255,255,0.95));
  outline:none;
  box-shadow: 0 2px 6px rgba(41,76,98,0.03) inset;
  transition: box-shadow .18s, border-color .18s, transform .08s;
  font-size:14px;
}
.custom-input:focus{
  border-color:var(--accent);
  box-shadow: 0 10px 30px rgba(41,76,98,0.06);
  transform: translateY(-1px);
}

/* ----- Buttons ----- */
.accent-btn{
  padding:10px 12px;
  border-radius:10px;
  background:var(--accent);
  color:white;
  border:none;
  cursor:pointer;
  box-shadow:0 10px 26px rgba(41,76,98,0.07);
  transition: transform .12s ease;
  font-weight:600;
}
.accent-btn:hover{ transform:translateY(-3px); }

.secondary-btn{
  padding:10px 12px;
  border-radius:10px;
  background:#f2f5f6;
  border:1px solid rgba(41,76,98,0.04);
  cursor:pointer;
  color:var(--accent);
}
.primary{
  background:linear-gradient(90deg,var(--accent),var(--accent-2));
  color:white;
  border:none;
  padding:10px 14px;
  border-radius:8px;
  cursor:pointer;
  box-shadow:0 10px 26px rgba(41,76,98,0.08);
  transition: transform .12s ease, box-shadow .12s ease;
}

/* ENSURE generate button always visible (fix) */
#generateBtn{
  background:linear-gradient(90deg,var(--accent),var(--accent-2)) !important;
  color:#ffffff !important;
  border: none !important;
  padding:10px 14px !important;
  border-radius:8px !important;
  box-shadow:0 10px 26px rgba(41,76,98,0.1) !important;
  font-weight:600;
}
#generateBtn:hover{ transform:translateY(-3px); }
#generateBtn:disabled{
  opacity:0.8 !important;
  cursor:not-allowed;
  filter:grayscale(0.07);
  color:white !important;
}

/* ----- Students panel ----- */
.students-panel .add-row{ display:flex; gap:8px; margin-bottom:8px; }
.students-panel input{ flex:1; }
.students-panel button{ padding:10px 12px; border-radius:8px; border:none; background:#eef6fb; cursor:pointer; color:var(--accent); }
.students-panel .wide{ margin-top:10px; width:100%; padding:10px; border-radius:8px; border:none; background:#f2fbff; cursor:pointer; color:var(--accent); }
.student-list{
  margin-top:12px;
  max-height:260px;
  overflow:auto;
  padding:8px;
  border-radius:8px;
  border:1px dashed rgba(41,76,98,0.04);
  background:linear-gradient(180deg, rgba(255,255,255,0.6), rgba(255,255,255,0.4));
}
.student-item{
  display:flex; align-items:center; justify-content:space-between;
  padding:8px 10px; border-radius:6px; background:#fff; margin-bottom:8px;
  border:1px solid rgba(41,76,98,0.03);
  transition: transform .12s ease;
}
.student-item:hover{ transform:translateX(6px); }
.student-item.assigned{ opacity:0.8; }
.student-item .left{ display:flex; align-items:center; gap:10px; }
.student-item .badge{ font-size:12px; padding:4px 6px; border-radius:12px; background:rgba(41,76,98,0.08); color:var(--accent); }
.student-item button{ border:none; background:transparent; cursor:pointer; color:var(--danger); font-weight:700; }

/* ----- Top controls / canvas wrap ----- */
.canvas-wrap{ flex:1; display:flex; flex-direction:column; }
.top-controls{ display:flex; gap:10px; margin-bottom:12px; align-items:center; }
.top-controls button{ padding:10px 14px; border-radius:8px; border:1px solid #e9eefc; background:white; cursor:pointer; }

/* toggle-grid button specific (should not inherit .tool active styles) */
.toggle-grid-btn{
  border:1px solid rgba(41,76,98,0.08);
  background:#fff;
  padding:10px 12px;
  border-radius:8px;
  color:var(--accent);
  cursor:pointer;
  transition: transform .12s ease, box-shadow .12s ease, background-color .18s;
}
.toggle-grid-btn:hover{ transform:translateY(-3px); box-shadow:0 8px 20px rgba(20,30,40,0.06); }

/* ----- Canvas area ----- */
#canvasContainer, .canvas{
  background: linear-gradient(180deg,#f8fbff,#f3f6f7);
  border-radius:12px;
  padding:18px;
  position:relative;
  box-shadow:var(--shadow);
  outline:none;
  overflow:auto;
  min-height:200px;
}

/* dotted grid background (visible when snap / grid enabled) */
/* animation for grid pulse on toggle */
#canvasContainer::before, .canvas::before{
  content:"";
  position:absolute; left:0; right:0; top:0; bottom:0;
  background-image:
    radial-gradient(rgba(41,76,98,0.03) 1px, transparent 1px);
  background-size:18px 18px;
  opacity:0.45;
  pointer-events:none;
  border-radius:10px;
  transition: opacity .24s ease, transform .22s ease;
}
#canvasContainer.snap::before, .canvas.snap::before{ opacity:0.9; }
#canvasContainer.grid-anim::before{ animation: gridPulse .55s ease; }

/* ----- Desk styles ----- */
.desk{
  position:absolute;
  min-width:150px;
  max-width:260px;
  background:var(--panel);
  border-radius:8px;
  border:1px solid rgba(41,76,98,0.06);
  box-shadow:0 10px 30px rgba(20,30,40,0.06);
  cursor:grab;
  user-select:none;
  padding:6px;
  transform-origin:left top;
  transition: left .12s ease, top .12s ease, transform .12s ease, box-shadow .12s ease;
}
.desk.pop{ animation:popIn .28s cubic-bezier(.2,.9,.2,1); }
.desk .desk-header{ display:flex; align-items:center; gap:6px; padding:6px; border-bottom:1px solid rgba(41,76,98,0.03); }
.desk .desk-actions{ display:flex; gap:6px; margin-left:auto; }
.desk .small-btn{ border:none; background:#f3f6ff; padding:4px 6px; border-radius:6px; cursor:pointer; color:var(--accent); }
.desk .seat-row{ display:flex; gap:6px; padding:6px; flex-wrap:wrap; }

/* selected desk */
.desk.selected{
  box-shadow:0 18px 46px rgba(20,30,50,0.14);
  transform:translateY(-6px);
  z-index:50;
  border-color:rgba(41,76,98,0.12);
}

/* ----- Seat and student chip ----- */
.seat{
  min-width:80px; max-width:180px; min-height:40px;
  border-radius:6px; border:1px dashed transparent;
  background:#fbfdff;
  display:flex; align-items:center; justify-content:center;
  position:relative; padding:6px; box-sizing:border-box; overflow:hidden; text-align:center;
  transition: background .12s ease, transform .12s ease, box-shadow .12s ease;
}
.seat.empty{ color:var(--muted); font-size:13px; }
.seat.flash{ animation:seatFlash .36s ease; }
.student-chip{
  display:block; max-width:100%; word-break: break-word; white-space: normal;
  padding:6px 8px; border-radius:12px; background:#eef6fb; border:1px solid rgba(41,76,98,0.08);
  cursor:grab; color:var(--accent); font-size:13px; line-height:1.1;
  transition: transform .12s ease, box-shadow .12s ease;
}
.student-chip.dragging{ transform:scale(.98) rotate(-2deg); box-shadow:0 18px 40px rgba(20,30,50,0.12); }

/* tanári hely */
.seat[data-type="teacher"]{
  min-width:140px; min-height:48px; background:#fff7e6; border:1px solid #fde3a7;
}

/* ----- Status / Footer ----- */
.statusbar{ margin-top:12px; padding:10px; color:var(--muted); text-align:center; font-size:13px; }
.footer{ text-align:center; padding:18px; color:var(--muted); font-size:13px; }

/* canvas hint */
.canvas-hint{
  position:absolute; left:50%; top:50%; transform:translate(-50%,-50%);
  color:var(--muted); text-align:center; pointer-events:none; animation:fadeIn .5s ease;
  font-size:14px;
}

/* ----- Modal ----- */
.modal{
  display:none; position:fixed; inset:0; background:rgba(0,0,0,0.35);
  align-items:center; justify-content:center; z-index:1200;
}
.modal[aria-hidden="false"]{ display:flex; }
.modal-content{
  width:420px; max-width:95%;
  background:linear-gradient(180deg,#fff,#fbfdff);
  padding:18px; border-radius:12px;
  box-shadow:0 20px 50px rgba(20,40,60,0.25);
  border:1px solid rgba(41,76,98,0.06);
  transform-origin:center;
}
.modal-animate{ animation:modalPop .28s cubic-bezier(.2,.9,.2,1); }

/* modal vertical layout for configurator fields */
.modal-row-vertical{ display:flex; flex-direction:column; gap:10px; margin-top:6px; }
.modal-label{ display:flex; flex-direction:column; gap:6px; font-size:14px; color:var(--muted); }

/* ----- Live preview inside modal ----- */
.live-preview{ margin-top:12px; }
.preview-info{ font-size:13px; color:var(--muted); margin-bottom:8px; }
.preview-frame{
  width:100%; height:160px; border-radius:8px;
  background:linear-gradient(180deg, rgba(255,255,255,0.6), rgba(255,255,255,0.4));
  border:1px dashed rgba(41,76,98,0.04);
  display:flex; align-items:center; justify-content:center; padding:12px; box-sizing:border-box;
}
.canvas-preview{
  width:100px; height:60px;
  background: linear-gradient(180deg,#ffffff,#f1f6fa);
  border-radius:4px;
  border:1px solid rgba(41,76,98,0.06);
  box-shadow:0 8px 20px rgba(20,30,40,0.06) inset;
  transition: width .18s ease, height .18s ease, transform .18s ease;
  display:flex; align-items:center; justify-content:center; font-size:11px; color:var(--muted);
  user-select:none;
}

/* ----- Toast / Notifications ----- */
.toast-container{
  position:fixed; right:18px; bottom:18px; z-index:1500; display:flex; flex-direction:column; gap:8px;
}
.toast{
  min-width:200px; max-width:360px;
  padding:10px 14px; border-radius:10px; color:white;
  box-shadow:0 8px 20px rgba(20,40,60,0.18);
  font-size:14px; display:flex; align-items:center; gap:10px;
  opacity:0; transform:translateY(6px); transition:opacity .22s, transform .22s;
}
.toast.show{ opacity:1; transform:translateY(0); }
.toast.info{ background: linear-gradient(90deg, var(--accent), var(--accent-2)); }
.toast.success{ background: linear-gradient(90deg,#2a9d8f,#57c6a6); }
.toast.error{ background: linear-gradient(90deg,#ff6b6b,#ff9b9b); }

/* ----- Keyframes / Animations ----- */
@keyframes popIn {
  0% { transform: translateY(8px) scale(.96); opacity:0 }
  60% { transform: translateY(-6px) scale(1.02); opacity:1 }
  100% { transform: translateY(0) scale(1) }
}
@keyframes seatFlash {
  0% { box-shadow:0 0 0 rgba(41,76,98,0); background:#fff }
  40% { box-shadow:0 0 24px rgba(41,76,98,0.08); background:#eaf6ff }
  100% { box-shadow:0 0 0 rgba(41,76,98,0); background:#fbfdff }
}
@keyframes modalPop {
  0% { transform: translateY(10px) scale(.98); opacity:0 }
  60% { transform: translateY(-6px) scale(1.02); opacity:1 }
  100% { transform: translateY(0) scale(1); opacity:1 }
}
@keyframes fadeIn {
  from { opacity:0; transform: translateY(6px) }
  to { opacity:1; transform: translateY(0) }
}
@keyframes fadeInDown {
  from { opacity:0; transform: translateY(-8px) }
  to { opacity:1; transform: translateY(0) }
}
@keyframes gridPulse {
  0% { opacity: 0.9; transform: scale(0.995); }
  50% { opacity: 1; transform: scale(1.002); }
  100% { opacity: 0.9; transform: scale(1); }
}

/* ----- Small helpers ----- */
.muted{ color:var(--muted); font-size:13px; text-align:center; }
.hidden{ display:none !important; }