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

:root {
  --pink: #ff78b2;
  --pink-dark: #e05597;
  --purple: #9f7dff;
  --text: #2f2440;
  --muted: #786d8a;
  --card-bg: rgba(255, 255, 255, 0.95);
  --shadow: 0 18px 46px rgba(86, 53, 116, 0.14);
  --shadow-soft: 0 10px 24px rgba(86, 53, 116, 0.1);
  --line: #eadff6;
  --danger: #ef4444;
}

html {
  direction: rtl;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Cairo", sans-serif;
  background:
    radial-gradient(circle at top right, rgba(255, 203, 227, 0.55), transparent 28%),
    radial-gradient(circle at bottom left, rgba(215, 223, 255, 0.72), transparent 34%),
    linear-gradient(135deg, #fff8fc, #f6f4ff);
  color: var(--text);
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
}

.page {
  min-height: 100vh;
  padding: 20px 14px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.shell {
  width: min(100%, 920px);
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.back-link,
.brand-badge {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 16px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.86);
  box-shadow: var(--shadow-soft);
  font-weight: 700;
}

.back-link {
  color: var(--muted);
}

.brand-badge {
  color: #fff;
  background: linear-gradient(135deg, var(--pink), var(--purple));
}

.wrapper {
  width: 100%;
  max-width: 560px;
}

.level-screen {
  text-align: center;
  padding: 2rem 1rem;
}

.level-screen h1 {
  font-size: clamp(2rem, 5vw, 2.8rem);
  margin: 0 0 8px;
  font-weight: 800;
}

.level-screen p {
  margin: 0 0 24px;
  color: var(--muted);
}

.level-buttons {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 250px;
  margin: 0 auto;
}

.level-btn {
  font-size: 1.1rem;
  font-weight: 800;
  padding: 0.95rem 1.2rem;
  border: none;
  border-radius: 16px;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s;
}

.level-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-soft);
}

.level-btn.easy {
  background: linear-gradient(135deg, #76d88b, #57c97a);
  color: #16301d;
}

.level-btn.medium {
  background: linear-gradient(135deg, #ffd76a, #ffbf47);
  color: #473300;
}

.level-btn.hard {
  background: linear-gradient(135deg, #ff7f96, #ef4f74);
  color: #fff;
}

.hidden {
  display: none !important;
}

.game-screen {
  background: var(--card-bg);
  border-radius: 28px;
  box-shadow: var(--shadow);
  padding: 18px;
}

.header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.header h1 {
  font-size: 1.7rem;
  margin: 0;
  font-weight: 800;
}

.toolbar {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-wrap: wrap;
}

.timer {
  font-variant-numeric: tabular-nums;
  font-weight: 800;
  color: var(--muted);
  min-width: 3.5rem;
}

.level-badge {
  font-size: 0.82rem;
  font-weight: 700;
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
  background: #f2ecff;
  color: #6a4ec7;
}

.btn {
  font-size: 0.92rem;
  font-weight: 700;
  padding: 0.55rem 1rem;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  background: linear-gradient(135deg, var(--pink), var(--purple));
  color: #fff;
  transition: transform 0.1s, opacity 0.15s;
}

.btn:hover {
  opacity: 0.92;
}

.btn:active {
  transform: scale(0.98);
}

.btn-ghost {
  background: #fff;
  color: var(--text);
  border: 1px solid var(--line);
}

.game-container {
  position: relative;
}

.board-wrapper {
  background: linear-gradient(180deg, #faf8ff, #f5f1ff);
  border-radius: 20px;
  padding: 12px;
  margin-bottom: 1rem;
  border: 1px solid var(--line);
}

.board {
  display: grid;
  aspect-ratio: 1;
  max-width: 100%;
  margin: 0 auto;
  border: 2px solid var(--pink);
  border-radius: 10px;
  overflow: hidden;
  background: #fff;
}

.board-4 { grid-template-columns: repeat(4, 1fr); grid-template-rows: repeat(4, 1fr); }
.board-6 { grid-template-columns: repeat(6, 1fr); grid-template-rows: repeat(6, 1fr); }
.board-9 { grid-template-columns: repeat(9, 1fr); grid-template-rows: repeat(9, 1fr); }

.cell {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: clamp(0.9rem, 4vw, 1.25rem);
  font-weight: 800;
  border: 1px solid rgba(120, 109, 138, 0.12);
  cursor: pointer;
  transition: background 0.15s;
  min-height: 0;
  background: #fff;
}

.cell.given {
  background: rgba(255, 120, 178, 0.12);
  color: var(--pink-dark);
  cursor: default;
}

.cell.user {
  color: var(--text);
}

.cell.selected {
  background: rgba(159, 125, 255, 0.18);
  outline: 2px solid var(--purple);
  outline-offset: -2px;
  z-index: 1;
}

.cell.same-number {
  background: rgba(255, 120, 178, 0.12);
}

.cell.error {
  color: var(--danger);
  background: rgba(239, 68, 68, 0.12);
}

.cell.cell-edge-r {
  border-right-width: 2px;
  border-right-color: rgba(120, 109, 138, 0.35);
}

.cell.cell-edge-b {
  border-bottom-width: 2px;
  border-bottom-color: rgba(120, 109, 138, 0.35);
}

.number-pad {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.5rem;
}

.num-btn {
  font-size: 1.05rem;
  font-weight: 800;
  padding: 0.7rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  cursor: pointer;
  background: #fff;
  color: var(--text);
  transition: transform 0.1s, background 0.15s;
}

.num-btn:hover {
  background: #faf7ff;
}

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

.num-btn-clear {
  grid-column: span 2;
  background: #fff3f3;
  color: var(--danger);
  border-color: rgba(239, 68, 68, 0.2);
}

.win-overlay {
  position: fixed;
  inset: 0;
  background: rgba(34, 24, 49, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 1rem;
}

.win-box {
  background: #fff;
  border-radius: 24px;
  padding: 2rem;
  text-align: center;
  max-width: 340px;
  width: 100%;
  box-shadow: var(--shadow);
}

.win-box h2 {
  margin: 0 0 0.5rem;
  font-size: 1.75rem;
  color: var(--text);
}

.win-time {
  margin: 0 0 1.5rem;
  color: var(--muted);
}

.btn-large {
  padding: 0.8rem 1.5rem;
  font-size: 1rem;
}

@media (max-width: 600px) {
  .page {
    padding: 14px 10px;
    align-items: flex-start;
  }

  .game-screen {
    padding: 14px;
    border-radius: 22px;
  }

  .header-actions,
  .toolbar {
    width: 100%;
  }

  .number-pad {
    grid-template-columns: repeat(5, 1fr);
  }

  .btn {
    font-size: 0.84rem;
    padding: 0.5rem 0.8rem;
  }
}