:root {
  --radius-lg: 16px;
  --radius-md: 10px;
  --shadow-soft: 0 18px 40px rgba(15, 23, 42, 0.85);
  --shadow-chip: 0 10px 25px rgba(15, 23, 42, 0.9);
  --transition-fast: 0.15s ease-out;

  --bg: #020617;
  --bg-glow: #0f172a;
  --panel-bg: #020617;
  --panel-glow: rgba(15, 23, 42, 0.9);
  --panel-section-bg: #020617;
  --panel-section-glow: rgba(15, 23, 42, 0.95);
  --panel-border: #1e293b;
  --panel-border-strong: rgba(30, 64, 175, 0.65);

  --text: #e5e7eb;
  --subtle-text: #9ca3af;

  --accent: #6366f1;
  --accent-rgb: 99, 102, 241;
  --accent-soft: rgba(99, 102, 241, 0.25);
  --support-rgb: 45, 212, 191;

  --header-glow-a: rgba(99, 102, 241, 0.16);
  --header-glow-b: rgba(45, 212, 191, 0.15);
  --toolbar-glow-a: rgba(99, 102, 241, 0.35);
  --toolbar-glow-b: rgba(45, 212, 191, 0.35);

  --grid-line: rgba(148, 163, 184, 0.2);
  --classroom-bg: #020617;
  --canvas-border: rgba(30, 64, 175, 0.9);
  --canvas-glow: rgba(15, 23, 42, 0.95);

  --table-bg: rgba(45, 212, 191, 0.85);
  --table-border: rgba(22, 163, 139, 1);
  --table-glow-a: rgba(19, 78, 74, 0.7);
  --table-glow-b: rgba(59, 130, 246, 0.3);

  --seat-bg: rgba(15, 23, 42, 0.98);
  --seat-border: rgba(148, 163, 184, 0.7);

  --room-fill: rgba(37, 99, 235, 0.12);
  --room-stroke: rgba(129, 140, 248, 0.9);
  --room-vertex-fill: #f9fafb;
  --room-vertex-stroke: rgba(129, 140, 248, 0.9);
  --room-vertex-selected-fill: #f97316;
  --room-vertex-selected-stroke: #fb923c;

  --status-bg: radial-gradient(circle at 0 0, rgba(17, 24, 39, 0.96), #020617 80%);
  --status-border: rgba(55, 65, 81, 0.9);
  --status-text-error: #fecaca;

  --btn-border: rgba(148, 163, 184, 0.7);
  --btn-bg: rgba(15, 23, 42, 0.98);
  --btn-bg-glow: rgba(148, 163, 184, 0.08);
  --btn-primary-border: rgba(129, 140, 248, 0.9);
  --btn-primary-from: #4f46e5;
  --btn-primary-to: #0ea5e9;
  --btn-danger-border: rgba(248, 113, 113, 0.9);
  --btn-danger-from: #b91c1c;
  --btn-danger-to: #f97316;

  --input-border: rgba(30, 64, 175, 0.7);
  --input-glow: rgba(30, 64, 175, 0.35);
  --input-bg: rgba(15, 23, 42, 0.98);

  --select-border: rgba(129, 140, 248, 0.9);
  --select-accent: rgba(129, 140, 248, 0.45);
  --select-highlight: rgba(56, 189, 248, 0.2);
  --select-bg: rgba(15, 23, 42, 0.98);
  --select-arrow: rgba(99, 102, 241, 0.95);

  --chip-bg: rgba(15, 23, 42, 0.9);
  --chip-border: rgba(30, 64, 175, 0.7);
  --delete-hover: #fecaca;

  --danger: #f97373;
}

body[data-theme="red"] {
  --bg: #140304;
  --bg-glow: #2a090d;
  --panel-border: #3f0b10;
  --panel-glow: rgba(61, 10, 15, 0.9);
  --panel-section-glow: rgba(54, 11, 16, 0.95);
  --accent: #fb7185;
  --accent-rgb: 251, 113, 133;
  --accent-soft: rgba(251, 113, 133, 0.25);
  --support-rgb: 249, 115, 22;
  --header-glow-a: rgba(251, 113, 133, 0.22);
  --header-glow-b: rgba(249, 115, 22, 0.2);
  --toolbar-glow-a: rgba(251, 113, 133, 0.45);
  --toolbar-glow-b: rgba(249, 150, 54, 0.35);
  --grid-line: rgba(248, 113, 113, 0.16);
  --table-bg: rgba(248, 113, 113, 0.92);
  --table-border: rgba(185, 28, 28, 0.95);
  --table-glow-a: rgba(185, 28, 28, 0.6);
  --table-glow-b: rgba(249, 115, 22, 0.4);
  --room-fill: rgba(248, 113, 113, 0.18);
  --room-stroke: rgba(248, 113, 113, 0.85);
  --room-vertex-stroke: rgba(248, 113, 113, 0.85);
  --select-border: rgba(248, 113, 113, 0.9);
  --select-arrow: rgba(248, 113, 113, 0.95);
  --btn-primary-border: rgba(248, 113, 113, 0.9);
  --btn-primary-from: #dc2626;
  --btn-primary-to: #fb923c;
  --canvas-border: rgba(248, 113, 113, 0.65);
}

body[data-theme="green"] {
  --bg: #03120d;
  --bg-glow: #08241a;
  --panel-border: #0f3d2f;
  --panel-glow: rgba(5, 33, 23, 0.9);
  --panel-section-glow: rgba(7, 40, 28, 0.95);
  --accent: #34d399;
  --accent-rgb: 52, 211, 153;
  --accent-soft: rgba(52, 211, 153, 0.25);
  --support-rgb: 16, 185, 129;
  --header-glow-a: rgba(52, 211, 153, 0.22);
  --header-glow-b: rgba(16, 185, 129, 0.18);
  --toolbar-glow-a: rgba(16, 185, 129, 0.35);
  --toolbar-glow-b: rgba(74, 222, 128, 0.3);
  --grid-line: rgba(52, 211, 153, 0.16);
  --table-bg: rgba(45, 212, 191, 0.9);
  --table-border: rgba(16, 185, 129, 0.95);
  --table-glow-a: rgba(15, 118, 110, 0.6);
  --table-glow-b: rgba(74, 222, 128, 0.35);
  --room-fill: rgba(45, 212, 191, 0.16);
  --room-stroke: rgba(16, 185, 129, 0.85);
  --room-vertex-stroke: rgba(16, 185, 129, 0.85);
  --select-border: rgba(16, 185, 129, 0.75);
  --select-arrow: rgba(52, 211, 153, 0.95);
  --btn-primary-border: rgba(16, 185, 129, 0.85);
  --btn-primary-from: #15803d;
  --btn-primary-to: #10b981;
  --canvas-border: rgba(16, 185, 129, 0.65);
}

body[data-theme="blue"] {
  --bg: #020b16;
  --bg-glow: #06213a;
  --panel-border: #12324c;
  --panel-glow: rgba(7, 21, 34, 0.9);
  --panel-section-glow: rgba(8, 26, 42, 0.95);
  --accent: #38bdf8;
  --accent-rgb: 56, 189, 248;
  --accent-soft: rgba(56, 189, 248, 0.25);
  --support-rgb: 59, 130, 246;
  --header-glow-a: rgba(56, 189, 248, 0.22);
  --header-glow-b: rgba(59, 130, 246, 0.2);
  --toolbar-glow-a: rgba(59, 130, 246, 0.4);
  --toolbar-glow-b: rgba(14, 165, 233, 0.35);
  --grid-line: rgba(56, 189, 248, 0.18);
  --table-bg: rgba(14, 165, 233, 0.9);
  --table-border: rgba(14, 116, 144, 0.95);
  --table-glow-a: rgba(14, 165, 233, 0.5);
  --table-glow-b: rgba(59, 130, 246, 0.35);
  --room-fill: rgba(56, 189, 248, 0.16);
  --room-stroke: rgba(56, 189, 248, 0.85);
  --room-vertex-stroke: rgba(56, 189, 248, 0.85);
  --select-border: rgba(56, 189, 248, 0.85);
  --select-arrow: rgba(56, 189, 248, 0.95);
  --btn-primary-border: rgba(59, 130, 246, 0.85);
  --btn-primary-from: #2563eb;
  --btn-primary-to: #0ea5e9;
  --canvas-border: rgba(56, 189, 248, 0.6);
}

body[data-theme="yellow"] {
  --bg: #161204;
  --bg-glow: #2f2404;
  --panel-border: #3d2d07;
  --panel-glow: rgba(39, 29, 6, 0.9);
  --panel-section-glow: rgba(42, 33, 8, 0.95);
  --accent: #facc15;
  --accent-rgb: 250, 204, 21;
  --accent-soft: rgba(250, 204, 21, 0.25);
  --support-rgb: 251, 191, 36;
  --header-glow-a: rgba(250, 204, 21, 0.25);
  --header-glow-b: rgba(251, 191, 36, 0.2);
  --toolbar-glow-a: rgba(250, 204, 21, 0.4);
  --toolbar-glow-b: rgba(251, 146, 60, 0.35);
  --grid-line: rgba(250, 204, 21, 0.14);
  --table-bg: rgba(253, 224, 71, 0.9);
  --table-border: rgba(217, 119, 6, 0.95);
  --table-glow-a: rgba(202, 138, 4, 0.45);
  --table-glow-b: rgba(249, 115, 22, 0.4);
  --room-fill: rgba(250, 204, 21, 0.18);
  --room-stroke: rgba(234, 179, 8, 0.85);
  --room-vertex-stroke: rgba(234, 179, 8, 0.85);
  --select-border: rgba(234, 179, 8, 0.75);
  --select-arrow: rgba(250, 204, 21, 0.95);
  --btn-primary-border: rgba(234, 179, 8, 0.8);
  --btn-primary-from: #ca8a04;
  --btn-primary-to: #facc15;
  --canvas-border: rgba(234, 179, 8, 0.6);
}

body[data-theme="orange"] {
  --bg: #1a0e03;
  --bg-glow: #311804;
  --panel-border: #492308;
  --panel-glow: rgba(43, 18, 4, 0.9);
  --panel-section-glow: rgba(46, 20, 4, 0.95);
  --accent: #fb923c;
  --accent-rgb: 251, 146, 60;
  --accent-soft: rgba(251, 146, 60, 0.25);
  --support-rgb: 249, 115, 22;
  --header-glow-a: rgba(251, 146, 60, 0.22);
  --header-glow-b: rgba(249, 115, 22, 0.2);
  --toolbar-glow-a: rgba(249, 115, 22, 0.4);
  --toolbar-glow-b: rgba(251, 191, 36, 0.35);
  --grid-line: rgba(251, 146, 60, 0.16);
  --table-bg: rgba(253, 186, 116, 0.9);
  --table-border: rgba(217, 119, 6, 0.95);
  --table-glow-a: rgba(194, 65, 12, 0.5);
  --table-glow-b: rgba(249, 115, 22, 0.35);
  --room-fill: rgba(251, 146, 60, 0.15);
  --room-stroke: rgba(248, 153, 83, 0.85);
  --room-vertex-stroke: rgba(248, 153, 83, 0.85);
  --select-border: rgba(251, 146, 60, 0.8);
  --select-arrow: rgba(251, 146, 60, 0.95);
  --btn-primary-border: rgba(251, 146, 60, 0.85);
  --btn-primary-from: #ea580c;
  --btn-primary-to: #f97316;
  --canvas-border: rgba(251, 146, 60, 0.6);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  background: radial-gradient(circle at top, var(--bg-glow) 0, var(--bg) 30%, var(--bg) 100%);
  color: var(--text);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
  transition: background 0.3s ease, color 0.3s ease;
}

/* Header */

.app-header {
  padding: 14px 22px;
  border-bottom: 1px solid var(--panel-border);
  background:
    radial-gradient(circle at top left, var(--header-glow-a), transparent 60%),
    radial-gradient(circle at top right, var(--header-glow-b), transparent 55%),
    var(--panel-bg);
  box-shadow: 0 18px 35px rgba(15, 23, 42, 0.85);
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.app-title {
  display: flex;
  align-items: center;
  gap: 12px;
}

.app-logo-img {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  object-fit: contain;
  background: rgba(15, 23, 42, 0.6);
  padding: 4px;
  box-shadow: 0 12px 25px rgba(15, 23, 42, 0.85);
}

.app-title-main {
  font-weight: 600;
  letter-spacing: 0.02em;
  font-size: 17px;
}

.app-title-sub {
  font-size: 12px;
  color: var(--subtle-text);
}

.app-header-controls {
  display: flex;
  align-items: center;
  gap: 12px;
}

.theme-switcher {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--subtle-text);
}

/* Layout */

.app-main {
  display: grid;
  grid-template-columns: minmax(260px, 340px) minmax(0, 1fr);
  height: calc(100vh - 60px);
}

/* Left panel */

.panel {
  background: radial-gradient(circle at top left, var(--panel-glow), var(--panel-bg) 60%);
  border-right: 1px solid var(--panel-border);
  padding: 16px 14px 18px;
  overflow-y: auto;
}

.panel-section {
  background: radial-gradient(circle at top, var(--panel-section-glow), var(--panel-section-bg) 70%);
  border-radius: var(--radius-lg);
  padding: 12px 12px 14px;
  border: 1px solid var(--panel-border-strong);
  box-shadow: var(--shadow-soft);
  margin-bottom: 12px;
}

.panel-section h2 {
  margin: 0 0 10px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--subtle-text);
}

.hint {
  margin: 6px 0 0;
  font-size: 11px;
  color: var(--subtle-text);
}

.class-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 10px;
}

.class-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--chip-border);
  background: rgba(15, 23, 42, 0.75);
  color: var(--text);
  cursor: pointer;
  box-shadow: var(--shadow-chip);
  transition:
    border-color var(--transition-fast),
    background var(--transition-fast),
    transform var(--transition-fast);
}

.class-pill.active {
  border-color: var(--accent);
  background: rgba(var(--accent-rgb), 0.18);
  transform: translateY(-1px);
}

.class-pill:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.class-label {
  font-size: 12px;
}

.class-delete-btn {
  width: 16px;
  height: 16px;
  border-radius: 999px;
  border: none;
  background: transparent;
  color: var(--subtle-text);
  font-size: 11px;
  cursor: pointer;
  padding: 0;
  line-height: 1;
  transition: color var(--transition-fast), transform var(--transition-fast);
}

.class-pill.active .class-delete-btn {
  color: var(--text);
}

.class-delete-btn:hover {
  color: var(--delete-hover);
  transform: scale(1.05);
}

.profile-actions {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.profile-actions .btn {
  width: 100%;
}

/* Form controls */

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px 10px;
}

label {
  font-size: 12px;
  color: var(--subtle-text);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

input,
select,
textarea,
button {
  font-family: inherit;
}

/* Add student row */

.add-student-row {
  display: flex;
  gap: 6px;
  align-items: center;
}

.add-student-row input {
  flex: 1;
  border-radius: 999px;
  border: 1px solid var(--input-border);
  background:
    radial-gradient(circle at 0 0, var(--input-glow), transparent 55%),
    var(--input-bg);
  color: var(--text);
  padding: 7px 9px;
  font-size: 12px;
  outline: none;
  box-shadow: var(--shadow-chip);
}

.add-student-row input::placeholder {
  color: rgba(148, 163, 184, 0.8);
  font-size: 11px;
}

.add-student-row input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent), var(--shadow-chip);
}

.stacked {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 8px;
}

/* Custom dropdowns */

.select {
  position: relative;
  display: block;
}

.select select {
  width: 100%;
  border-radius: 999px;
  border: 1px solid var(--select-border);
  background:
    radial-gradient(circle at 0 0, var(--select-accent), transparent 55%),
    radial-gradient(circle at 100% 100%, var(--select-highlight), transparent 60%),
    var(--select-bg);
  color: var(--text);
  padding: 8px 30px 8px 11px;
  font-size: 12px;
  outline: none;
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  box-shadow: var(--shadow-chip);
  cursor: pointer;
}

.select select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent), var(--shadow-chip);
}

.select::after {
  content: "▾";
  position: absolute;
  right: 11px;
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
  font-size: 11px;
  color: var(--select-arrow);
  opacity: 0.95;
}

.select.select-compact select {
  padding: 5px 20px 5px 9px;
  font-size: 11px;
}

.select.select-compact::after {
  font-size: 9px;
}

/* Student list */

.students-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
  max-height: 180px;
  overflow-y: auto;
  padding-right: 2px;
  margin-bottom: 8px;
}

.student-row {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 6px;
  border-radius: 999px;
  background: var(--chip-bg);
  border: 1px solid var(--chip-border);
  box-shadow: 0 6px 16px rgba(15, 23, 42, 0.9);
}

.student-name {
  font-size: 12px;
  color: var(--text);
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.student-delete-btn {
  width: 18px;
  height: 18px;
  border-radius: 999px;
  border: none;
  background: transparent;
  color: #9ca3af;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  cursor: pointer;
  padding: 0;
  line-height: 1;
  transition: background var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.student-delete-btn:hover {
  background: rgba(15, 23, 42, 0.3);
  color: var(--delete-hover);
}

.student-delete-btn:active {
  transform: translateY(0.5px);
}

/* Buttons */

.btn {
  border-radius: 999px;
  border: 1px solid var(--btn-border);
  background:
    radial-gradient(circle at 10% 0, var(--btn-bg-glow), transparent 55%),
    var(--btn-bg);
  color: var(--text);
  font-size: 12px;
  padding: 7px 11px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  box-shadow: var(--shadow-chip);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast);
  min-width: 0;
}

.btn.primary {
  border-color: var(--btn-primary-border);
  background:
    radial-gradient(circle at 0 0, var(--accent-soft), transparent 55%),
    linear-gradient(135deg, var(--btn-primary-from), var(--btn-primary-to));
}

.btn.danger {
  border-color: var(--btn-danger-border);
  background:
    radial-gradient(circle at 5% 0, rgba(248, 113, 113, 0.4), transparent 55%),
    linear-gradient(135deg, var(--btn-danger-from), var(--btn-danger-to));
  font-size: 11px;
}

.btn.full {
  width: 100%;
  margin-top: 8px;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 16px 40px rgba(15, 23, 42, 0.95);
}

.btn:active {
  transform: translateY(0);
  box-shadow: var(--shadow-chip);
}

/* Canvas side */

.canvas-section {
  padding: 14px 14px 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.canvas-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 7px 10px;
  border-radius: 999px;
  border: 1px solid var(--panel-border);
  background:
    radial-gradient(circle at 0 0, var(--toolbar-glow-a), transparent 60%),
    radial-gradient(circle at 100% 0, var(--toolbar-glow-b), transparent 55%),
    var(--panel-bg);
  box-shadow: 0 14px 30px rgba(15, 23, 42, 0.95);
  font-size: 11px;
}

.toolbar-title {
  font-weight: 500;
}

.toolbar-hint {
  color: var(--subtle-text);
}

.classroom-wrapper {
  flex: 1;
  border-radius: 20px;
  border: 1px solid var(--canvas-border);
  overflow: auto;
  background: radial-gradient(circle at top left, var(--canvas-glow), var(--panel-bg) 70%);
  box-shadow: 0 26px 60px rgba(15, 23, 42, 0.98);
}

/* Classroom canvas */

#classroom {
  position: relative;
  min-height: 420px;
  min-width: 420px;
  background-color: var(--classroom-bg);
  background-image: linear-gradient(
      to right,
      var(--grid-line) 1px,
      transparent 1px
    ),
    linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
  background-size: 60px 60px;
  border-radius: 20px;
}

/* Room polygon */

#roomSvg {
  position: absolute;
  inset: 0;
  pointer-events: auto;
}

.room-polygon {
  fill: var(--room-fill);
  stroke: var(--room-stroke);
  stroke-width: 2;
  cursor: grab;
}

.room-polygon:active {
  cursor: grabbing;
}

.room-vertex {
  fill: var(--room-vertex-fill);
  stroke: var(--room-vertex-stroke);
  stroke-width: 2;
  cursor: pointer;
  filter: drop-shadow(0 0 4px rgba(15, 23, 42, 0.9));
}

.room-vertex-selected {
  fill: var(--room-vertex-selected-fill);
  stroke: var(--room-vertex-selected-stroke);
}

/* Table & seats */

.table {
  position: absolute;
  border-radius: 14px;
  background:
    radial-gradient(circle at 20% 0, var(--table-glow-a), transparent 65%),
    radial-gradient(circle at 100% 100%, var(--table-glow-b), transparent 55%),
    var(--table-bg);
  border: 1px solid var(--table-border);
  box-shadow: 0 20px 45px rgba(15, 23, 42, 0.95);
  cursor: move;
  padding: 4px;
  overflow: visible;
  z-index: 2;
}

.table::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  border: 1px solid rgba(15, 23, 42, 0.3);
  pointer-events: none;
}

.table.round-table {
  border-radius: 999px;
  clip-path: circle(50% at 50% 50%);
}

.table.round-table .table-body {
  border-radius: 999px;
}

.table-header {
  font-size: 10px;
  color: rgba(15, 23, 42, 0.7);
  padding: 0 4px 1px;
  display: flex;
  justify-content: flex-start;
  align-items: center;
  gap: 4px;
}

.table-delete-btn {
  margin-left: auto;
  width: 16px;
  height: 16px;
  border-radius: 999px;
  border: none;
  background: transparent;
  color: rgba(15, 23, 42, 0.6);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  cursor: pointer;
  padding: 0;
  line-height: 1;
  transition: background var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.table-delete-btn:hover {
  background: rgba(15, 23, 42, 0.12);
  color: rgba(127, 29, 29, 0.96);
  transform: translateY(-0.5px);
}

.table-delete-btn:active {
  transform: translateY(0);
}

.table-body {
  position: relative;
  width: 100%;
  height: 100%;
}

.table-resize-handle {
  position: absolute;
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: var(--room-vertex-fill);
  border: 2px solid rgba(15, 23, 42, 0.9);
  box-shadow: 0 0 4px rgba(15, 23, 42, 0.9);
  z-index: 5;
}

.table-resize-nw {
  top: -7px;
  left: -7px;
  cursor: nwse-resize;
}

.table-resize-ne {
  top: -7px;
  right: -7px;
  cursor: nesw-resize;
}

.table-resize-se {
  bottom: -7px;
  right: -7px;
  cursor: nwse-resize;
}

.table-resize-sw {
  bottom: -7px;
  left: -7px;
  cursor: nesw-resize;
}

.seat {
  position: absolute;
  transform: translate(-50%, -50%);
  width: 26px;
  height: 26px;
  border-radius: 999px;
  background:
    radial-gradient(circle at 0 0, rgba(156, 163, 175, 0.6), transparent 65%),
    var(--seat-bg);
  border: 1px solid var(--seat-border);
  box-shadow: 0 10px 22px rgba(15, 23, 42, 0.95);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2px;
  font-size: 9px;
  line-height: 1.1;
  text-align: center;
  color: var(--text);
  pointer-events: none;
}

/* Status area */

.status {
  margin-top: 6px;
  font-size: 11px;
  color: var(--subtle-text);
  padding: 6px 9px;
  border-radius: 999px;
  border: 1px dashed var(--status-border);
  background: var(--status-bg);
  max-height: 60px;
  overflow-y: auto;
}

.status.error {
  color: var(--status-text-error);
}

/* Responsive */

@media (max-width: 900px) {
  .app-main {
    grid-template-columns: 1fr;
    grid-auto-rows: auto;
  }

  .panel {
    border-right: none;
    border-bottom: 1px solid var(--panel-border);
  }

  .canvas-section {
    height: auto;
    min-height: 420px;
  }

  .app-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .app-header-controls {
    width: 100%;
  }
}