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

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

/* ================
   Themes
   ================ */

html[data-theme="dark"] {
  --bg-main: radial-gradient(circle at top, #111827 0, #020617 45%, #020617 100%);
  --bg-header: rgba(15, 23, 42, 0.95);
  --bg-card: rgba(15, 23, 42, 0.98);
  --bg-card-soft: rgba(15, 23, 42, 0.9);
  --border-subtle: rgba(148, 163, 184, 0.35);
  --accent: #38bdf8;
  --accent-soft: rgba(56, 189, 248, 0.12);
  --accent-strong: #0ea5e9;
  --text-main: #e5e7eb;
  --text-soft: #9ca3af;
  --danger: #f97373;
  --success: #4ade80;
  --pill-bg: rgba(15, 23, 42, 0.9);
  --overlay-bg: rgba(15, 23, 42, 0.98);
}

html[data-theme="light"] {
  --bg-main: radial-gradient(circle at top, #eff6ff 0, #e5e7eb 50%, #e5e7eb 100%);
  --bg-header: rgba(248, 250, 252, 0.96);
  --bg-card: #f9fafb;
  --bg-card-soft: #f3f4f6;
  --border-subtle: rgba(148, 163, 184, 0.5);
  --accent: #2563eb;
  --accent-soft: rgba(37, 99, 235, 0.12);
  --accent-strong: #1d4ed8;
  --text-main: #0f172a;
  --text-soft: #6b7280;
  --danger: #b91c1c;
  --success: #16a34a;
  --pill-bg: #e5e7eb;
  --overlay-bg: #ffffff;
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg-main);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.hidden {
  display: none !important;
}

/* ================
   Header
   ================ */
.app-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--bg-header);
  border-bottom: 1px solid var(--border-subtle);
  padding: 0.75rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.logo-dot {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: var(--accent-strong);
  box-shadow: 0 0 14px rgba(56, 189, 248, 0.7);
}

.logo-text {
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 0.78rem;
  color: var(--text-soft);
}

/* Theme toggle button */
.contrast-toggle {
  border-radius: 999px;
  border: 1px solid var(--border-subtle);
  background: var(--bg-card-soft);
  color: var(--text-soft);
  padding: 0.25rem 0.6rem;
  font-size: 0.7rem;
  cursor: pointer;
  text-transform: uppercase;
}

/* ================
   Main layout
   ================ */
.app-main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

.card {
  background: var(--bg-card);
  border-radius: 1.5rem;
  border: 1px solid var(--border-subtle);
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.25);
}

.game-card {
  width: 100%;
  max-width: 520px;
  padding: 1.75rem 1.5rem 1.5rem;
}

/* Title */
.game-title {
  font-size: 1.35rem;
  margin: 0 0 0.9rem 0;
  text-align: center;
}

/* ================
   Play mode toggle (single vs multi)
   ================ */
.playmode-toggle {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.25rem;
  padding: 0.4rem;
  border-radius: 999px;
  border: 1px solid var(--border-subtle);
  background: var(--bg-card-soft);
  margin: 0 auto 0.6rem;
  width: fit-content;
}

.mode-btn {
  border: none;
  background: transparent;
  color: var(--text-soft);
  font-size: 0.8rem;
  padding: 0.25rem 0.8rem;
  border-radius: 999px;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* Dark mode: white text on toggles */
html[data-theme="dark"] .mode-btn {
  color: #e5e7eb;
}

.mode-btn.active {
  background: var(--accent-soft);
  color: var(--accent-strong);
  border: 1px solid var(--accent);
}

/* ================
   Multiplayer controls
   ================ */
.multiplayer-controls {
  border-radius: 1rem;
  border: 1px dashed var(--border-subtle);
  background: var(--bg-card-soft);
  padding: 0.6rem 0.7rem;
  margin-bottom: 0.7rem;
  font-size: 0.8rem;
}

.mp-row {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  margin-bottom: 0.4rem;
}

.mp-name-label {
  font-size: 0.8rem;
  color: var(--text-soft);
  white-space: nowrap;
}

.mp-name-input {
  flex: 1;
  min-width: 0;
}

.mp-join-btn {
  width: 100%;
  margin-bottom: 0.4rem;
}

.multiplayer-status {
  color: var(--text-soft);
  margin-bottom: 0.25rem;
}

/* Lobby countdown */
.mp-countdown {
  font-family: "Courier New", ui-monospace, SFMono-Regular, Menlo, Monaco,
    Consolas, "Liberation Mono", "Lucida Console", monospace;
  font-size: 1.1rem;
  color: #f97373;
  margin-bottom: 0.35rem;
  text-align: center;
}

.multiplayer-players-list {
  list-style: none;
  padding: 0;
  margin: 0.25rem 0 0;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  align-items: flex-start;
}

.multiplayer-players-list li {
  padding: 0.1rem 0.4rem;
  border-radius: 999px;
  background: var(--pill-bg);
  border: 1px solid var(--border-subtle);
  font-size: 0.75rem;
}

/* ================
   Mode toggle (Multiplication vs Algebra)
   ================ */
.mode-toggle {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.25rem;
  padding: 0.4rem;
  border-radius: 999px;
  border: 1px solid var(--border-subtle);
  background: var(--bg-card-soft);
  margin: 0.6rem auto 0.9rem;
  width: fit-content;
}

/* ================
   Controls row
   ================ */
.controls-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: flex-end;
  justify-content: center;
  margin-bottom: 0.75rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  min-width: 120px;
}

.field-label {
  font-size: 0.8rem;
  color: var(--text-soft);
}

.field-input {
  background: var(--bg-card-soft);
  border-radius: 999px;
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  padding: 0.45rem 0.85rem;
  font-size: 0.9rem;
  outline: none;
}

.field-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px rgba(56, 189, 248, 0.45);
}

.field-buttons {
  flex-direction: row;
  gap: 0.5rem;
}

/* Show/hide based on single / multi mode */
.single-only {
  display: flex;
}

body.multi-play .single-only {
  display: none !important;
}

/* Show/hide controls based on multiplication vs algebra */
.multi-only {
  display: flex;
}

.algebra-only {
  display: none;
}

body.algebra-mode .multi-only {
  display: none;
}

body.algebra-mode .algebra-only {
  display: flex;
}

/* ================
   Timer
   ================ */
.timed-info {
  text-align: center;
  margin-bottom: 0.75rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
}

.timer-label {
  font-size: 0.8rem;
  color: var(--text-soft);
}

.timer-display {
  font-family: "Courier New", ui-monospace, SFMono-Regular, Menlo, Monaco,
    Consolas, "Liberation Mono", "Lucida Console", monospace;
  font-size: 1.2rem;
  padding: 0.2rem 0.7rem;
  border-radius: 0.5rem;
  background: #111827;
  color: #f87171;
  letter-spacing: 0.08em;
  min-width: 120px;
  text-align: center;
  border: 1px solid rgba(248, 113, 113, 0.4);
  box-shadow: 0 0 10px rgba(248, 113, 113, 0.3);
}

/* ================
   Question area
   ================ */
/* Hidden by default; only show when game is playing */
.question-area {
  display: none;
  background: var(--bg-card-soft);
  border-radius: 1.25rem;
  padding: 1.1rem 1rem 1rem;
  border: 1px solid rgba(148, 163, 184, 0.3);
  margin-bottom: 0.6rem;
  transition: border-color 0.15s ease, box-shadow 0.15s ease,
    background-color 0.15s ease;
  min-height: 120px;
}

body.playing .question-area {
  display: block;
}

.question-area.correct {
  border-color: var(--success);
  box-shadow: 0 0 12px rgba(74, 222, 128, 0.35);
}

.question-area.wrong {
  border-color: var(--danger);
  box-shadow: 0 0 12px rgba(248, 113, 113, 0.35);
  background-color: rgba(127, 29, 29, 0.35);
}

/* Question meta pill */
.question-meta-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.25rem;
  font-size: 0.85rem;
  padding: 0.15rem 0.7rem;
  border-radius: 999px;
  background: var(--pill-bg);
  border: 1px solid rgba(148, 163, 184, 0.6);
  margin: 0 auto 0.4rem;
}

.dot-separator {
  opacity: 0.7;
}

.question-pill {
  display: inline-flex;
  align-items: baseline;
  justify-content: center;
  gap: 0.4rem;
  font-size: 1.8rem;
  font-weight: 600;
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
  background: radial-gradient(circle at top, var(--accent-soft), transparent 70%);
  margin: 0 auto 0.4rem;
}

.operator,
.equals {
  color: var(--accent-strong);
}

/* Result operand (only visible in algebra mode) */
.result-operand {
  min-width: 1.5ch;
  text-align: center;
}

body.multiplication-mode .result-operand {
  display: none;
}

body.algebra-mode .result-operand {
  display: inline-block;
}

/* Hint below question */
.question-hint {
  text-align: center;
  font-size: 0.9rem;
  color: var(--text-soft);
  min-height: 1.1rem;
}

/* Answer BELOW question */
.answer-wrapper {
  margin-top: 0.5rem;
  text-align: center;
}

.answer-input-below {
  width: 80%;
  max-width: 300px;
  font-size: 2.4rem;
  font-weight: 700;
  padding: 0.6rem 0.8rem;
  border-radius: 1rem;
  border: 2px solid var(--accent);
  background: #0f172a;
  color: #f9fafb;
  text-align: center;
  outline: none;
}

/* Light theme override for answer box */
html[data-theme="light"] .answer-input-below {
  background: #ffffff;
  color: #0f172a;
}

/* ================
   Buttons
   ================ */
.button-row {
  display: none;
  gap: 0.5rem;
  justify-content: center;
  margin-bottom: 0.5rem;
}

body.playing .button-row {
  display: flex;
}

.btn {
  border-radius: 999px;
  border: 1px solid transparent;
  padding: 0.45rem 0.9rem;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.18s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 90px;
}

.btn.primary {
  background: linear-gradient(135deg, #0f766e, #22c55e);
  color: #ecfdf3;
  border-color: rgba(16, 185, 129, 0.7);
}

.btn.primary:hover {
  filter: brightness(1.08);
  transform: translateY(-1px);
}

.btn.ghost {
  background: transparent;
  border-color: var(--border-subtle);
  color: var(--text-soft);
}

.btn.ghost:hover {
  border-color: var(--accent);
  color: var(--accent-strong);
}

/* Stop button */
.btn.danger {
  background: linear-gradient(135deg, #b91c1c, #ef4444);
  color: #fee2e2;
  border-color: rgba(239, 68, 68, 0.6);
}

.btn.danger:hover {
  filter: brightness(1.08);
  transform: translateY(-1px);
}

/* ================
   Feedback + stats
   ================ */
.feedback {
  text-align: center;
  font-size: 0.9rem;
  margin-top: 0.6rem;
  min-height: 1.2rem;
}

.feedback.correct {
  color: var(--success);
}

.feedback.wrong {
  color: var(--danger);
}

.stats {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  justify-content: center;
  margin-top: 0.7rem;
  font-size: 0.8rem;
}

.stat-pill {
  background: var(--pill-bg);
  border-radius: 999px;
  padding: 0.3rem 0.75rem;
  border: 1px solid rgba(148, 163, 184, 0.5);
}

/* You said the 4 stats pills are not needed visually */
.stats {
  display: none !important;
}

/* ================
   Big tick / cross overlay
   ================ */
.result-overlay {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  z-index: 50;
}

.result-icon {
  font-size: 5rem;
  font-weight: 700;
  opacity: 0;
  transform: scale(0.8);
  transition: opacity 0.15s ease, transform 0.15s ease;
  text-shadow: 0 0 18px rgba(0, 0, 0, 0.8);
}

.result-icon.show {
  opacity: 1;
  transform: scale(1);
}

.result-icon.correct-flash {
  color: var(--success);
}

.result-icon.wrong-flash {
  color: var(--danger);
}

/* ================
   Keypad
   ================ */
.keypad {
  margin: 0.6rem auto 0.6rem;
  max-width: 360px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
  opacity: 0;
  transform: translateY(30px);
  max-height: 0;
  overflow: hidden;
  transition: opacity 0.25s ease, transform 0.25s ease, max-height 0.25s ease;
}

/* Slide-up visible state */
.keypad.keypad-visible {
  opacity: 1;
  transform: translateY(0);
  max-height: 400px;
}

.keypad button {
  border-radius: 0.9rem;
  border: 1px solid var(--border-subtle);
  background: #020617;
  color: #f9fafb;
  font-size: 1.4rem;
  font-weight: 600;
  padding: 0.65rem 0;
  cursor: pointer;
  transition: background 0.12s ease, transform 0.1s ease, box-shadow 0.1s ease;
}

/* Light mode keypad */
html[data-theme="light"] .keypad button {
  background: #e5e7eb;
  color: #0f172a;
}

.keypad button:active {
  transform: translateY(1px);
  box-shadow: 0 0 0 1px var(--accent-soft);
}

.keypad-func {
  font-size: 0.9rem;
}

.keypad-enter {
  grid-column: 1 / -1;
  background: linear-gradient(135deg, #0f766e, #22c55e);
  border-color: rgba(16, 185, 129, 0.7);
}

/* ================
   Leaderboard overlay
   ================ */
.leaderboard-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 60;
}

.leaderboard-card {
  background: var(--overlay-bg);
  color: var(--text-main);
  border-radius: 1.5rem;
  padding: 1.2rem 1.4rem 1rem;
  max-width: 400px;
  width: 90%;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.45);
  border: 1px solid var(--border-subtle);
}

.leaderboard-title {
  margin: 0 0 0.75rem;
  text-align: center;
}

.leaderboard-content {
  max-height: 260px;
  overflow-y: auto;
  margin-bottom: 0.75rem;
  font-size: 0.9rem;
}

.leaderboard-table {
  width: 100%;
  border-collapse: collapse;
}

.leaderboard-table th,
.leaderboard-table td {
  padding: 0.3rem 0.4rem;
  border-bottom: 1px solid rgba(148, 163, 184, 0.4);
  text-align: left;
  font-size: 0.8rem;
}

.leaderboard-table th {
  font-weight: 600;
}

.leaderboard-table tr:nth-child(1) td {
  font-weight: 700;
}

.lb-close-btn {
  width: 100%;
}

/* ================
   MINIMAL PLAYING UI (all devices)
   ================ */
/* When the game is running, hide all the top controls everywhere
   so you basically see: question area + answer pill + keypad + bottom buttons */
body.playing .app-header,
body.playing .game-title,
body.playing .feedback,
body.playing .stats,
body.playing .timed-info,
body.playing .mode-toggle,
body.playing .playmode-toggle,
body.playing .multiplayer-controls,
body.playing .controls-row {
  display: none;
}

/* Allow scrolling so buttons are never cut off */
body.playing {
  overflow-y: auto;
}

/* ================
   Mobile tweaks
   ================ */
@media (max-width: 600px) {
  .app-main {
    align-items: stretch;
    padding: 0.75rem;
  }

  .game-card {
    padding: 1.25rem 1rem 1rem;
    border-radius: 1.25rem;
  }

  .game-title {
    font-size: 1.2rem;
    margin-bottom: 0.75rem;
  }

  .question-pill {
    font-size: 1.6rem;
  }

  .answer-input-below {
    font-size: 1.6rem;
    padding: 0.45rem 0.6rem;
    border-width: 2px;
    max-width: 220px;
  }

  .keypad button {
    font-size: 1.5rem;
    padding: 0.75rem 0;
  }

  body.playing .question-area {
    margin-top: 0.25rem;
  }
}