:root {
  --assignment-primary: #F09E0B;
  --assignment-border: #3d4f63;
  --assignment-text: #e5e7eb;
  --player-max-width: 1380px;
  --player-primary: var(--assignment-primary);
  --player-border: var(--assignment-border);
  --player-text: var(--assignment-text);
  --assignment-card-a-border: rgba(217, 119, 6, 0.48);
  --assignment-card-a-bg-top: rgba(255, 247, 214, 0.99);
  --assignment-card-a-bg-bottom: rgba(253, 230, 138, 0.96);
  --assignment-card-a-label: rgba(146, 94, 5, 0.74);
  --assignment-card-b-border: rgba(194, 65, 12, 0.5);
  --assignment-card-b-bg-top: rgba(255, 237, 213, 0.99);
  --assignment-card-b-bg-bottom: rgba(253, 186, 116, 0.96);
  --assignment-card-b-label: rgba(154, 52, 18, 0.74);
  --assignment-solved-card-border: rgba(240, 158, 11, 0.5);
  --assignment-solved-card-bg-top: rgba(255, 246, 224, 0.99);
  --assignment-solved-card-bg-bottom: rgba(253, 230, 138, 0.96);
  --assignment-solved-card-label: rgba(146, 94, 5, 0.82);
  --assignment-scale: 1;
  --assignment-sidebar-width: 320px;
  --assignment-board-min-height: 460px;
}

body {
  background:
    radial-gradient(circle at top, rgba(240, 158, 11, 0.12), rgba(15, 23, 42, 0) 28%),
    linear-gradient(180deg, #0f172a 0%, #152234 100%);
}

.assignment-player-hero,
.assignment-stage,
.state-card {
  background: linear-gradient(180deg, rgba(38, 53, 73, 0.98), rgba(26, 37, 47, 0.98));
  border: 1px solid var(--assignment-border);
  border-radius: 18px;
  padding: 1.5rem;
}

.assignment-description {
  margin: 0;
  color: #cbd5e1;
}

.assignment-stage {
  display: grid;
  gap: 1rem;
}

.assignment-toolbar {
  display: flex;
  gap: 0.9rem;
  align-items: center;
  flex-wrap: wrap;
}

.assignment-stage-head {
  display: grid;
  gap: 1rem;
}

.fullscreen-toolbar {
  display: flex;
  width: 100%;
  justify-content: center;
}

.fullscreen-size-control {
  width: min(100%, 560px);
  display: grid;
  gap: 0.9rem;
  padding: 1.15rem 1.4rem;
  border-radius: 18px;
  border: 1px solid rgba(240, 158, 11, 0.24);
  background: rgba(15, 23, 42, 0.45);
}

.fullscreen-size-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  color: #e2e8f0;
  font-weight: 600;
}

.fullscreen-size-slider {
  width: 100%;
  accent-color: #F09E0B;
  cursor: pointer;
  min-height: 1.4rem;
}

.pill {
  border: 2px solid var(--assignment-border);
  padding: 0.55rem 1rem;
  border-radius: 999px;
  background: rgba(38, 53, 73, 0.72);
  font-size: 0.95rem;
  color: var(--assignment-text);
}

button {
  appearance: none;
  border: 1px solid var(--assignment-border);
  color: var(--assignment-text);
  background: rgba(38, 53, 73, 0.6);
  padding: 0.75rem 1rem;
  border-radius: 10px;
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 700;
  transition: all 0.2s ease;
}

button:not(.assignment-card):hover {
  background: rgba(240, 158, 11, 0.16);
  border-color: var(--assignment-primary);
}

button.ghost {
  background: transparent;
  border-color: var(--assignment-primary);
  color: var(--assignment-primary);
}

.state-card {
  color: #cbd5e1;
  text-align: center;
}

.hidden {
  display: none !important;
}

.assignment-app {
  display: grid;
  gap: 1rem;
}

.status-banner {
  padding: 0.95rem 1rem;
  border-radius: 12px;
  background: rgba(240, 158, 11, 0.12);
  border: 1px solid rgba(240, 158, 11, 0.28);
  color: #ffd88f;
  font-weight: 600;
  text-align: center;
}

.assignment-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(250px, 320px);
  gap: 1rem;
  align-items: start;
}

.assignment-board-panel,
.assignment-solved-panel {
  display: grid;
  gap: 0.85rem;
  min-width: 0;
}

.assignment-panel-head {
  display: grid;
  gap: 0.35rem;
}

.assignment-panel-head h2 {
  margin: 0;
  color: #ffffff;
  font-size: 1.15rem;
}

.assignment-panel-head p {
  margin: 0;
  color: #cbd5e1;
  font-size: 0.92rem;
}

.assignment-board {
  position: relative;
  min-height: var(--assignment-board-min-height);
  border-radius: 20px;
  border: 1px solid rgba(71, 85, 105, 0.9);
  background:
    linear-gradient(180deg, rgba(19, 34, 44, 0.92), rgba(12, 21, 30, 0.96)),
    radial-gradient(circle at top left, rgba(240, 158, 11, 0.12), transparent 40%);
  overflow: hidden;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.03);
}

.assignment-board::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 24px 24px;
  pointer-events: none;
}

.assignment-card {
  position: absolute;
  width: var(--assignment-card-width, 180px);
  height: var(--assignment-card-height, 124px);
  aspect-ratio: 4 / 3;
  padding: 1rem;
  border-radius: 18px;
  border: 1px solid rgba(148, 163, 184, 0.45);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(226, 232, 240, 0.94));
  box-shadow: 0 14px 26px rgba(0, 0, 0, 0.25);
  color: #13202b;
  font: inherit;
  font-weight: 700;
  line-height: 1.35;
  text-align: left;
  overflow-wrap: anywhere;
  word-break: break-word;
  user-select: none;
  touch-action: none;
  cursor: grab;
  z-index: 2;
  transition: box-shadow 0.2s ease, border-color 0.2s ease, transform 0.12s ease, filter 0.2s ease;
}

.assignment-card--a {
  border-color: var(--assignment-card-a-border);
  background: linear-gradient(180deg, var(--assignment-card-a-bg-top), var(--assignment-card-a-bg-bottom));
}

.assignment-card--b {
  border-color: var(--assignment-card-b-border);
  background: linear-gradient(180deg, var(--assignment-card-b-bg-top), var(--assignment-card-b-bg-bottom));
}

.assignment-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 18px 34px rgba(15, 23, 42, 0.28);
  filter: saturate(1.03);
}

.assignment-card--a:hover {
  border-color: rgba(217, 119, 6, 0.74);
  box-shadow: 0 18px 34px rgba(217, 119, 6, 0.16);
}

.assignment-card--b:hover {
  border-color: rgba(194, 65, 12, 0.76);
  box-shadow: 0 18px 34px rgba(194, 65, 12, 0.18);
}

.assignment-card.is-dragging {
  cursor: grabbing;
  box-shadow: 0 18px 34px rgba(0, 0, 0, 0.35);
  transform: scale(1.03);
  z-index: 10;
}

.assignment-card__label {
  display: block;
  margin-bottom: 0.55rem;
  color: rgba(19, 32, 43, 0.58);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.assignment-card--a .assignment-card__label {
  color: var(--assignment-card-a-label);
}

.assignment-card--b .assignment-card__label {
  color: var(--assignment-card-b-label);
}

.assignment-card__text {
  display: block;
}

.solved-pairs {
  display: grid;
  gap: 0.75rem;
}

.solved-empty {
  padding: 1rem;
  border-radius: 16px;
  border: 1px dashed rgba(148, 163, 184, 0.32);
  color: #94a3b8;
  text-align: center;
  background: rgba(15, 23, 42, 0.28);
}

.solved-pair {
  display: grid;
  gap: 0.75rem;
  padding: 0.85rem;
  border-radius: 18px;
  border: 1px solid rgba(240, 158, 11, 0.32);
  background: linear-gradient(180deg, rgba(240, 158, 11, 0.12), rgba(15, 23, 42, 0.42));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.03);
}

.solved-pair__cards {
  display: grid;
  gap: 0.65rem;
}

.solved-card {
  padding: 0.85rem 0.9rem;
  border-radius: 14px;
  border: 1px solid var(--assignment-solved-card-border);
  background: linear-gradient(180deg, var(--assignment-solved-card-bg-top), var(--assignment-solved-card-bg-bottom));
  color: #13202b;
  font-weight: 700;
  line-height: 1.32;
  overflow-wrap: anywhere;
}

.solved-card--a {
  border-color: var(--assignment-solved-card-border);
  background: linear-gradient(180deg, var(--assignment-solved-card-bg-top), var(--assignment-solved-card-bg-bottom));
}

.solved-card--b {
  border-color: var(--assignment-solved-card-border);
  background: linear-gradient(180deg, var(--assignment-solved-card-bg-top), var(--assignment-solved-card-bg-bottom));
}

.solved-pair__badge {
  justify-self: start;
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
  background: rgba(240, 158, 11, 0.18);
  color: #ffd88f;
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.assignment-stage:fullscreen {
  width: 100%;
  max-width: none;
  min-height: 100vh;
  border-radius: 0;
  padding: 1rem 1.1rem 1.1rem;
  overflow-y: auto;
  background:
    radial-gradient(circle at top, rgba(240, 158, 11, 0.12), rgba(15, 23, 42, 0.98) 30%, rgba(10, 15, 25, 1) 100%),
    #111827;
}

.assignment-stage:fullscreen .assignment-stage-head {
  position: sticky;
  top: 0;
  z-index: 20;
  width: 100%;
  margin-left: 0;
  margin-right: 0;
  padding-top: 4px;
  padding-bottom: 8px;
  background: linear-gradient(180deg, rgba(17, 24, 39, 0.96), rgba(17, 24, 39, 0.84) 70%, rgba(17, 24, 39, 0));
  backdrop-filter: blur(10px);
}

.assignment-stage:fullscreen .assignment-app {
  gap: 0.75rem;
}

.assignment-stage:fullscreen .assignment-toolbar {
  gap: 0.7rem;
}

.assignment-stage:fullscreen .assignment-board-panel,
.assignment-stage:fullscreen .assignment-solved-panel {
  gap: 0.7rem;
}

.assignment-stage:fullscreen .assignment-toolbar,
.assignment-stage:fullscreen .fullscreen-toolbar,
.assignment-stage:fullscreen .status-banner,
.assignment-stage:fullscreen .assignment-layout {
  width: 100%;
  margin-left: 0;
  margin-right: 0;
}

.assignment-stage:fullscreen .assignment-layout {
  grid-template-columns: minmax(0, 1fr) minmax(240px, var(--assignment-sidebar-width));
  gap: 0.8rem;
}

.assignment-stage:fullscreen .assignment-solved-panel {
  width: 100%;
  min-width: 240px;
  max-width: var(--assignment-sidebar-width);
}

.assignment-stage:fullscreen .pill,
.assignment-stage:fullscreen .assignment-toolbar button,
.assignment-stage:fullscreen .fullscreen-toolbar button,
.assignment-stage:fullscreen .fullscreen-size-header,
.assignment-stage:fullscreen .status-banner {
  font-size: 1.1rem;
}

.assignment-stage:fullscreen .pill,
.assignment-stage:fullscreen .assignment-toolbar button,
.assignment-stage:fullscreen .fullscreen-toolbar button {
  min-height: 3.4rem;
}

.assignment-stage:fullscreen .assignment-card {
  font-size: 1rem;
}

.fullscreen-toolbar.hidden {
  display: none !important;
}

@media (max-width: 980px) {
  .assignment-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .assignment-toolbar {
    flex-direction: column;
    align-items: stretch;
  }

  .pill,
  button {
    width: 100%;
    text-align: center;
  }

  .assignment-stage:fullscreen .assignment-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .assignment-player-hero,
  .assignment-stage,
  .state-card {
    padding: 1rem;
  }

  .assignment-card {
    padding: 0.85rem;
    border-radius: 16px;
  }
}