:root {
  --bg: #e4e4e4;
  --bg-panel: #fff;
  --accent: #ff6b35;
  --accent-glow: rgba(255, 107, 53, 0.25);
  --accent-soft: #e85d04;
  --selected: #1a9b6c;
  --selected-glow: rgba(26, 155, 108, 0.35);
  --text: #1a1a1a;
  --text-dim: #5c5c5c;
  --line: rgba(0, 0, 0, 0.08);
  --line-strong: rgba(0, 0, 0, 0.14);
  --cell-radius: 10px;
  --radius: 14px;
  --page-margin: 50px;
  --ease: cubic-bezier(0.34, 1.2, 0.64, 1);
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html,
body {
  margin: 0;
  height: 100dvh;
  width: 100dvw;
  overflow: hidden;
  overscroll-behavior: none;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: "Outfit", system-ui, sans-serif;
  color: var(--text);
  background: var(--bg);
}

/* ── Menu button ── */
.menu-btn {
  position: fixed;
  z-index: 40;
  top: max(10px, env(safe-area-inset-top));
  left: max(10px, env(safe-area-inset-left));
  width: 32px;
  height: 32px;
  padding: 0;
  border: none;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0.55;
  transition: opacity 0.2s ease;
}

.menu-btn:hover {
  opacity: 0.9;
}

.menu-btn:active {
  opacity: 1;
}

body.drawer-open .menu-btn {
  opacity: 0;
  pointer-events: none;
}

.menu-icon,
.menu-icon::before,
.menu-icon::after {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--text);
  border-radius: 1px;
  position: relative;
}

.menu-icon::before,
.menu-icon::after {
  content: "";
  position: absolute;
  left: 0;
}

.menu-icon::before {
  top: -6px;
}

.menu-icon::after {
  top: 6px;
}

/* ── Drawer ── */
.drawer {
  position: fixed;
  z-index: 60;
  top: 0;
  left: 0;
  width: var(--drawer-w);
  height: 100dvh;
  background: var(--bg-panel);
  box-shadow: 4px 0 32px rgba(0, 0, 0, 0.15);
  transform: translateX(-100%);
  transition: transform 0.38s var(--ease);
  padding: max(16px, env(safe-area-inset-top)) max(20px, env(safe-area-inset-left)) 24px 20px;
}

.drawer.open {
  transform: translateX(0);
}

.drawer-inner {
  display: flex;
  flex-direction: column;
  gap: 20px;
  height: 100%;
  justify-content: center;
}

.drawer-close {
  position: absolute;
  top: max(12px, env(safe-area-inset-top));
  right: 14px;
  width: 36px;
  height: 36px;
  border: none;
  border-radius: 8px;
  background: var(--bg);
  color: var(--text-dim);
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}

.drawer-close:hover {
  color: var(--text);
  background: var(--line);
}

.drawer-scrim {
  position: fixed;
  inset: 0;
  z-index: 55;
  background: rgba(0, 0, 0, 0.35);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.35s var(--ease-out), visibility 0.35s;
}

.drawer-scrim.visible {
  opacity: 1;
  visibility: visible;
}

.drawer-scrim[hidden] {
  display: block !important;
}

.title {
  margin: 0;
  font-family: "Bebas Neue", sans-serif;
  font-size: clamp(2.4rem, 10vw, 3.2rem);
  letter-spacing: 0.06em;
  color: var(--text);
  line-height: 0.95;
}

.seed-form {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.seed-label {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-dim);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.seed-row {
  display: flex;
  gap: 8px;
  align-items: stretch;
}

.seed-input {
  flex: 1;
  min-width: 0;
  padding: 10px 14px;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--line-strong);
  border-radius: 12px;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.seed-input:focus {
  border-color: var(--accent-soft);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.seed-input::-webkit-outer-spin-button,
.seed-input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.seed-input[type="number"] {
  -moz-appearance: textfield;
  appearance: textfield;
}

.btn-seed {
  padding: 10px 18px;
  color: var(--text);
  background: #fff;
  border: 1px solid var(--line-strong);
  flex-shrink: 0;
}

.btn-seed:hover {
  background: var(--bg);
}

.btn-seed:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn {
  font-family: inherit;
  font-weight: 700;
  font-size: 0.95rem;
  border: none;
  border-radius: 999px;
  cursor: pointer;
  transition:
    transform 0.25s var(--ease),
    box-shadow 0.25s var(--ease),
    background 0.25s var(--ease-out);
}

.btn:active {
  transform: scale(0.96);
}

.btn-new {
  padding: 12px 22px;
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-soft));
  box-shadow: 0 4px 16px var(--accent-glow);
  align-self: flex-start;
}

/* ── Board viewport & 1D pan ── */
.board-viewport {
  position: fixed;
  inset: 0;
  overflow: hidden;
  touch-action: none;
  cursor: grab;
  user-select: none;
  -webkit-user-select: none;
}

.board-stage,
.board,
.cell {
  touch-action: none;
  -webkit-touch-callout: none;
}

/* Margins applied via JS on .board-frame (absolute children ignore viewport padding) */
.board-frame {
  position: absolute;
  overflow: hidden;
}

.board-stage {
  position: absolute;
  will-change: transform;
  transition: transform 0.08s linear;
}

.board-viewport.is-dragging .board-stage {
  transition: none;
}

.board {
  width: 100%;
  height: 100%;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  grid-template-rows: repeat(5, 1fr);
  gap: 6px;
  padding: 6px;
  background: transparent;
}

/* portrait: T/B margins, pan L/R. landscape: L/R margins, pan up/down */
.board-viewport[data-layout="portrait"] .board-stage {
  left: 0;
  right: auto;
  bottom: 0;
  top: auto;
}

.board-viewport[data-layout="landscape"] .board-stage {
  right: 0;
  left: auto;
  top: 0;
  bottom: auto;
}

.board-viewport.is-dragging {
  cursor: grabbing;
}

.board-viewport.is-dragging .cell {
  pointer-events: none;
}

.cell {
  position: relative;
  margin: 0;
  padding: 5px;
  border: none;
  border-radius: var(--cell-radius);
  background: #fff;
  cursor: pointer;
  overflow: hidden;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  aspect-ratio: 1;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.1);
  -webkit-tap-highlight-color: transparent;
  transition:
    transform 0.35s var(--ease),
    box-shadow 0.35s var(--ease-out),
    filter 0.35s var(--ease-out),
    background 0.35s var(--ease-out);
}

.cell img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: bottom center;
  pointer-events: none;
  user-select: none;
  transition: transform 0.4s var(--ease), filter 0.35s var(--ease-out);
}

.cell-glow {
  position: absolute;
  inset: 0;
  opacity: 0;
  background: radial-gradient(circle at 50% 85%, var(--selected-glow), transparent 70%);
  transition: opacity 0.4s var(--ease-out);
  pointer-events: none;
}

.cell-mark {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: scale(0.3);
  transition: opacity 0.3s var(--ease-out), transform 0.4s var(--ease);
  pointer-events: none;
  z-index: 4;
}

.cell-mark svg {
  width: 58%;
  height: 58%;
  color: #fff;
  filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.45));
}

.cell::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: var(--cell-radius);
  background: transparent;
  transition: background 0.3s var(--ease-out);
  pointer-events: none;
  z-index: 1;
}

.cell::after {
  content: "";
  position: absolute;
  inset: 0;
  border: 3px solid transparent;
  border-radius: var(--cell-radius);
  transition: border-color 0.35s var(--ease-out), border-width 0.35s var(--ease-out);
  pointer-events: none;
  z-index: 3;
}

.cell:hover:not(.selected) {
  transform: scale(1.03);
  z-index: 1;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.14);
}

.cell.selected {
  transform: scale(0.92);
  background: #b8efd9;
  box-shadow:
    0 0 0 5px var(--selected),
    0 0 0 9px rgba(26, 155, 108, 0.25),
    0 8px 24px var(--selected-glow);
}

.cell.selected::before {
  background: rgba(13, 122, 82, 0.28);
}

.cell.selected::after {
  border-color: #0a6b47;
  border-width: 5px;
}

.cell.selected .cell-glow {
  opacity: 1;
  background: radial-gradient(circle at 50% 50%, rgba(26, 155, 108, 0.35), transparent 72%);
}

.cell.selected .cell-mark {
  opacity: 1;
  transform: scale(1);
}

.cell.selected img {
  filter: saturate(0.85) brightness(0.92);
  transform: scale(0.94);
}

/* ── Modal ── */
.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(6px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s var(--ease-out), visibility 0.3s;
}

.modal-backdrop.open {
  opacity: 1;
  visibility: visible;
}

.modal-backdrop[hidden] {
  display: flex !important;
}

.modal {
  width: min(400px, 100%);
  padding: 28px 24px;
  border-radius: var(--radius);
  background: #fff;
  border: 1px solid var(--line-strong);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.18);
  transform: scale(0.9) translateY(12px);
  transition: transform 0.35s var(--ease);
}

.modal-backdrop.open .modal {
  transform: scale(1) translateY(0);
}

.modal h2 {
  margin: 0 0 10px;
  font-family: "Bebas Neue", sans-serif;
  font-size: 1.75rem;
  letter-spacing: 0.05em;
  color: var(--text);
}

.modal p {
  margin: 0 0 22px;
  color: var(--text-dim);
  line-height: 1.5;
  font-size: 0.95rem;
}

.modal-actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  flex-wrap: wrap;
}

.btn-ghost {
  padding: 11px 18px;
  background: transparent;
  color: var(--text-dim);
  border: 1px solid var(--line-strong);
}

.btn-ghost:hover {
  color: var(--text);
  background: var(--bg);
}

.btn-danger {
  padding: 11px 20px;
  color: #fff;
  background: linear-gradient(135deg, #e84545, #c62828);
  box-shadow: 0 4px 20px rgba(232, 69, 69, 0.35);
}

.board.refreshing .cell {
  animation: cell-in 0.5s var(--ease) backwards;
}

.board.refreshing .cell:nth-child(1) { animation-delay: 0ms; }
.board.refreshing .cell:nth-child(2) { animation-delay: 20ms; }
.board.refreshing .cell:nth-child(3) { animation-delay: 40ms; }
.board.refreshing .cell:nth-child(4) { animation-delay: 60ms; }
.board.refreshing .cell:nth-child(5) { animation-delay: 80ms; }
.board.refreshing .cell:nth-child(6) { animation-delay: 100ms; }
.board.refreshing .cell:nth-child(7) { animation-delay: 120ms; }
.board.refreshing .cell:nth-child(8) { animation-delay: 140ms; }
.board.refreshing .cell:nth-child(9) { animation-delay: 160ms; }
.board.refreshing .cell:nth-child(10) { animation-delay: 180ms; }
.board.refreshing .cell:nth-child(11) { animation-delay: 200ms; }
.board.refreshing .cell:nth-child(12) { animation-delay: 220ms; }
.board.refreshing .cell:nth-child(13) { animation-delay: 240ms; }
.board.refreshing .cell:nth-child(14) { animation-delay: 260ms; }
.board.refreshing .cell:nth-child(15) { animation-delay: 280ms; }
.board.refreshing .cell:nth-child(16) { animation-delay: 300ms; }
.board.refreshing .cell:nth-child(17) { animation-delay: 320ms; }
.board.refreshing .cell:nth-child(18) { animation-delay: 340ms; }
.board.refreshing .cell:nth-child(19) { animation-delay: 360ms; }
.board.refreshing .cell:nth-child(20) { animation-delay: 380ms; }
.board.refreshing .cell:nth-child(21) { animation-delay: 400ms; }
.board.refreshing .cell:nth-child(22) { animation-delay: 420ms; }
.board.refreshing .cell:nth-child(23) { animation-delay: 440ms; }
.board.refreshing .cell:nth-child(24) { animation-delay: 460ms; }
.board.refreshing .cell:nth-child(25) { animation-delay: 480ms; }

@keyframes cell-in {
  from {
    opacity: 0;
    transform: scale(0.85);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}