:root {
  --purple: #6c5ce7;
  --purple-dark: #5344c9;
  --orange: #ff9f43;
  --orange-dark: #f0810f;
  --teal: #00cec9;
  --pink: #ff6b9a;
  --yellow: #ffd93d;
  --green: #2ecc71;
  --red: #ff5e5e;
  --ink: #2d2a4a;
  --ink-soft: #635f8a;
  --bg: #f4f1ff;
  --card: #ffffff;
  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-sm: 12px;
  --shadow: 0 10px 30px rgba(108, 92, 231, 0.15);
  --shadow-sm: 0 4px 12px rgba(108, 92, 231, 0.12);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  background: var(--bg);
  background-image:
    radial-gradient(circle at 10% 10%, rgba(255, 159, 67, 0.12) 0, transparent 40%),
    radial-gradient(circle at 90% 20%, rgba(0, 206, 201, 0.12) 0, transparent 40%),
    radial-gradient(circle at 50% 90%, rgba(108, 92, 231, 0.10) 0, transparent 45%);
  font-family: 'Nunito', system-ui, sans-serif;
  color: var(--ink);
}

h1, h2, h3, .display-font {
  font-family: 'Baloo 2', 'Nunito', sans-serif;
}

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

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 28px;
  flex-wrap: wrap;
  gap: 12px;
}

.app-brand {
  font-family: 'Baloo 2', sans-serif;
  font-weight: 800;
  font-size: 1.6rem;
  color: var(--purple-dark);
}

.app-brand-emoji { font-size: 1.8rem; }

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

.app-main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 10px 20px 60px;
}

.app-footer {
  text-align: center;
  color: var(--ink-soft);
  font-size: 0.85rem;
  padding: 24px 12px 40px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: 'Baloo 2', sans-serif;
  font-weight: 700;
  font-size: 1rem;
  padding: 12px 26px;
  border-radius: 999px;
  border: none;
  cursor: pointer;
  transition: transform 0.12s ease, box-shadow 0.12s ease;
  box-shadow: var(--shadow-sm);
}
.btn:active { transform: translateY(2px) scale(0.98); }
.btn-primary { background: var(--purple); color: #fff; }
.btn-primary:hover { background: var(--purple-dark); }
.btn-accent { background: var(--orange); color: #fff; }
.btn-accent:hover { background: var(--orange-dark); }
.btn-ghost { background: #fff; color: var(--purple-dark); border: 2px solid #e4dffc; box-shadow: none; }
.btn-ghost:hover { background: #f1eeff; }
.btn-danger { background: #fff; color: var(--red); border: 2px solid #ffd9d9; box-shadow: none; }
.btn-lg { padding: 18px 36px; font-size: 1.2rem; }
.btn-block { width: 100%; }

/* Cards */
.card {
  background: var(--card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 28px;
}
.card-sm { border-radius: var(--radius-md); padding: 20px; }

/* Landing */
.hero {
  text-align: center;
  padding: 30px 10px 10px;
}
.hero h1 {
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--purple-dark);
  margin-bottom: 8px;
}
.hero p { font-size: 1.15rem; color: var(--ink-soft); margin-bottom: 34px; }

.choice-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 10px;
}
@media (max-width: 700px) {
  .choice-grid { grid-template-columns: 1fr; }
}

.choice-card {
  border-radius: var(--radius-lg);
  padding: 36px 26px;
  color: #fff;
  text-align: center;
  box-shadow: var(--shadow);
  transition: transform 0.15s ease;
  display: block;
}
.choice-card:hover { transform: translateY(-4px); }
.choice-card.student { background: linear-gradient(135deg, var(--teal), #00b4b0); }
.choice-card.teacher { background: linear-gradient(135deg, var(--purple), var(--purple-dark)); }
.choice-card .emoji { font-size: 3.4rem; display: block; margin-bottom: 10px; }
.choice-card h2 { margin: 0 0 8px; font-size: 1.5rem; }
.choice-card p { margin: 0; opacity: 0.9; }

/* Forms */
.form-wrap { max-width: 440px; margin: 20px auto; }
.form-group { margin-bottom: 18px; }
.form-group label {
  display: block;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--ink);
}
.form-control {
  width: 100%;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  border: 2px solid #e4dffc;
  font-size: 1rem;
  font-family: inherit;
  background: #fbfaff;
}
.form-control:focus { outline: none; border-color: var(--purple); }
.field-error, .text-danger { color: var(--red); font-size: 0.88rem; margin-top: 4px; display: block; }
.validation-summary-errors ul { color: var(--red); padding-left: 20px; margin: 0 0 12px; }

.avatar-picker { display: flex; flex-wrap: wrap; gap: 10px; }
.avatar-option {
  font-size: 1.6rem;
  padding: 10px;
  border-radius: 14px;
  border: 2px solid #e4dffc;
  background: #fbfaff;
  cursor: pointer;
}
.avatar-option.selected { border-color: var(--purple); background: #ece8ff; }

.center-text { text-align: center; }
.muted { color: var(--ink-soft); }

/* Join code badge */
.code-badge {
  display: inline-block;
  font-family: 'Baloo 2', sans-serif;
  font-weight: 800;
  letter-spacing: 4px;
  font-size: 1.4rem;
  background: #ece8ff;
  color: var(--purple-dark);
  padding: 10px 22px;
  border-radius: var(--radius-sm);
}

/* Class list / roster */
.class-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 18px; }
.class-card { border-radius: var(--radius-md); background: #fff; box-shadow: var(--shadow-sm); padding: 20px; }
.class-card h3 { margin: 0 0 6px; color: var(--purple-dark); }

.roster-table { width: 100%; border-collapse: collapse; margin-top: 10px; }
.roster-table th, .roster-table td {
  text-align: left;
  padding: 12px 14px;
  border-bottom: 1px solid #ece8ff;
}
.roster-table th { color: var(--ink-soft); font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.04em; }

.stars-pill {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: #fff6de;
  color: #c78a00;
  padding: 4px 12px;
  border-radius: 999px;
  font-weight: 700;
}

/* Game menu */
.game-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 20px; }
.game-tile {
  border-radius: var(--radius-lg);
  padding: 26px 20px;
  text-align: center;
  background: linear-gradient(160deg, #fff, #f7f4ff);
  box-shadow: var(--shadow-sm);
  border: 2px solid transparent;
}
.game-tile.active { cursor: pointer; border-color: #e4dffc; }
.game-tile.active:hover { border-color: var(--purple); transform: translateY(-3px); }
.game-tile.locked { opacity: 0.55; }
.game-tile .emoji { font-size: 3rem; }
.game-tile h3 { margin: 10px 0 4px; }
.game-tile .badge-soon {
  display: inline-block;
  margin-top: 10px;
  font-size: 0.75rem;
  background: #eee;
  color: #888;
  padding: 3px 10px;
  border-radius: 999px;
}

.student-chip {
  display: flex;
  align-items: center;
  gap: 10px;
  background: #fff;
  padding: 8px 16px;
  border-radius: 999px;
  box-shadow: var(--shadow-sm);
  font-weight: 700;
}
.student-chip .emoji { font-size: 1.4rem; }

/* Speed tier select */
.tier-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  max-width: 640px;
  margin: 20px auto 0;
}
@media (max-width: 640px) {
  .tier-grid { grid-template-columns: 1fr; }
}
.tier-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 26px 18px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  border: 3px solid transparent;
  cursor: pointer;
  transition: transform 0.12s ease, border-color 0.12s ease;
}
.tier-card:hover { transform: translateY(-3px); border-color: var(--purple); }
.tier-card .tier-emoji { font-size: 2.6rem; display: block; margin-bottom: 6px; }
.tier-card h3 { margin: 4px 0; }
.tier-card .tier-multiplier {
  display: inline-block;
  margin-top: 10px;
  font-weight: 700;
  font-size: 0.85rem;
  background: #fff6de;
  color: #c78a00;
  padding: 4px 12px;
  border-radius: 999px;
}

/* Rounding game */
.game-shell {
  max-width: 720px;
  margin: 0 auto;
}
.game-hud {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
  flex-wrap: wrap;
  gap: 10px;
}
.hud-hearts { font-size: 1.4rem; letter-spacing: 3px; }
.hud-score { font-family: 'Baloo 2', sans-serif; font-weight: 800; color: var(--purple-dark); font-size: 1.2rem; }
.hud-progress {
  height: 10px;
  background: #ece8ff;
  border-radius: 99px;
  overflow: hidden;
  margin-bottom: 22px;
}
.hud-progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--teal), var(--purple));
  border-radius: 99px;
  transition: width 0.3s ease;
}

.mascot-bubble {
  background: #fff;
  border-radius: var(--radius-md);
  padding: 16px 20px;
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 24px;
}
.mascot-bubble .emoji { font-size: 2.2rem; }
.mascot-bubble p { margin: 0; font-weight: 700; font-size: 1.05rem; }

.number-display {
  text-align: center;
  font-family: 'Baloo 2', sans-serif;
  font-weight: 800;
  font-size: 4rem;
  color: var(--purple-dark);
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow);
  margin-bottom: 26px;
}

.number-line-wrap { margin-bottom: 30px; }
.number-line {
  position: relative;
  height: 70px;
  margin: 0 20px;
}
.number-line .track {
  position: absolute;
  top: 30px;
  left: 0;
  right: 0;
  height: 6px;
  background: #ece8ff;
  border-radius: 4px;
}
.number-line .tick {
  position: absolute;
  top: 18px;
  width: 3px;
  height: 30px;
  background: var(--purple);
  border-radius: 2px;
}
.number-line .tick-label {
  position: absolute;
  top: 46px;
  transform: translateX(-50%);
  font-weight: 700;
  color: var(--ink-soft);
  font-size: 0.85rem;
}
.number-line .marker {
  position: absolute;
  top: -4px;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--orange);
  border: 3px solid #fff;
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
  transform: translateX(-50%);
}

.answers-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}
.answer-btn {
  font-family: 'Baloo 2', sans-serif;
  font-size: 2rem;
  font-weight: 800;
  padding: 24px;
  border-radius: var(--radius-md);
  border: 3px solid #e4dffc;
  background: #fff;
  cursor: pointer;
  color: var(--ink);
  box-shadow: var(--shadow-sm);
  transition: transform 0.1s ease;
}
.answer-btn:hover { border-color: var(--purple); transform: translateY(-2px); }
.answer-btn.correct { background: #eafff1; border-color: var(--green); color: #1e9e51; }
.answer-btn.wrong { background: #fff0f0; border-color: var(--red); color: #d13a3a; }
.answer-btn:disabled { cursor: default; }
.answer-btn-text { font-size: 1.3rem; padding: 22px 16px; }
.answer-btn-text .big-emoji { font-size: 2.2rem; display: block; margin-bottom: 6px; }

.streak-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: linear-gradient(135deg, var(--orange), var(--pink));
  color: #fff;
  padding: 6px 16px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.9rem;
}

/* Yuvarlama Avcısı (balloon catch arcade) */
.avci-banner {
  text-align: center;
  font-family: 'Baloo 2', sans-serif;
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--purple-dark);
  background: #fff;
  border-radius: var(--radius-md);
  padding: 14px 18px;
  box-shadow: var(--shadow-sm);
  margin-bottom: 14px;
}
.avci-arena {
  position: relative;
  height: 400px;
  background: linear-gradient(180deg, #eef0ff, #f9f7ff);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  margin-bottom: 8px;
}
.balloon {
  position: absolute;
  bottom: -100px;
  width: 72px;
  height: 90px;
  border-radius: 50% 50% 50% 50% / 60% 60% 40% 40%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Baloo 2', sans-serif;
  font-weight: 800;
  font-size: 1.25rem;
  color: #fff;
  cursor: pointer;
  box-shadow: 0 6px 14px rgba(0,0,0,0.18);
  animation-name: balloon-float;
  animation-timing-function: linear;
  animation-fill-mode: forwards;
  user-select: none;
  border: none;
  padding: 0;
}
@keyframes balloon-float {
  from { bottom: -100px; }
  to { bottom: 430px; }
}
.balloon.popped {
  animation-play-state: paused;
  transform: scale(1.5);
  opacity: 0;
  transition: transform 0.25s ease, opacity 0.25s ease;
}
.balloon.wrong-pop {
  animation-play-state: paused;
  box-shadow: 0 0 0 4px var(--red);
  transition: opacity 0.35s ease;
  opacity: 0;
}

/* Hafıza Eşleştirme (memory match) */
.memory-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  max-width: 560px;
  margin: 0 auto;
}
@media (max-width: 560px) {
  .memory-grid { grid-template-columns: repeat(3, 1fr); }
}
.memory-card {
  aspect-ratio: 3 / 4;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--purple), var(--purple-dark));
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Baloo 2', sans-serif;
  font-weight: 800;
  font-size: 1.4rem;
  color: #fff;
  cursor: pointer;
  user-select: none;
}
.memory-card.flipped {
  background: #fff;
  color: var(--ink);
  border: 3px solid var(--purple);
}
.memory-card.matched {
  background: #eafff1;
  border: 3px solid var(--green);
  color: #1e9e51;
  cursor: default;
}
.memory-card.mismatch {
  animation: shake 0.4s;
  background: #fff0f0;
  border: 3px solid var(--red);
  color: #d13a3a;
}

/* Yuvarlama Klavyesi (numeric keypad typing) */
.typed-display {
  text-align: center;
  font-family: 'Baloo 2', sans-serif;
  font-weight: 800;
  font-size: 2.6rem;
  color: var(--purple-dark);
  background: #fff;
  border-radius: var(--radius-md);
  padding: 16px;
  box-shadow: var(--shadow-sm);
  margin-bottom: 18px;
  min-height: 1.4em;
  letter-spacing: 2px;
}
.typed-display.placeholder { color: #c9c4ea; }
.keypad-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  max-width: 340px;
  margin: 0 auto;
}
.keypad-btn {
  font-family: 'Baloo 2', sans-serif;
  font-weight: 800;
  font-size: 1.6rem;
  padding: 18px 0;
  border-radius: var(--radius-sm);
  border: 2px solid #e4dffc;
  background: #fff;
  color: var(--ink);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
}
.keypad-btn:hover { border-color: var(--purple); }
.keypad-btn.keypad-confirm { background: var(--green); color: #fff; border-color: var(--green); }
.keypad-btn.keypad-clear { background: #fff0f0; color: var(--red); border-color: #ffd9d9; font-size: 1.1rem; }

/* Doğru mu Yanlış mı? */
.statement-display {
  text-align: center;
  font-family: 'Baloo 2', sans-serif;
  font-weight: 700;
  font-size: 1.6rem;
  line-height: 1.4;
  color: var(--ink);
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 30px 24px;
  box-shadow: var(--shadow);
  margin-bottom: 26px;
}
.tf-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.tf-btn.tf-true.correct, .tf-btn.tf-false.correct { background: #eafff1; border-color: var(--green); color: #1e9e51; }
.tf-btn.wrong { background: #fff0f0; border-color: var(--red); color: #d13a3a; }

/* Hangileri Doğru? (multi-select) */
.chip-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  gap: 14px;
  margin-bottom: 24px;
}
.chip-btn {
  font-family: 'Baloo 2', sans-serif;
  font-weight: 800;
  font-size: 1.4rem;
  padding: 20px 10px;
  border-radius: var(--radius-md);
  border: 3px solid #e4dffc;
  background: #fff;
  color: var(--ink);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
}
.chip-btn.selected { border-color: var(--purple); background: #ece8ff; }
.chip-btn.chip-correct { border-color: var(--green); background: #eafff1; color: #1e9e51; }
.chip-btn.chip-missed { border-color: var(--orange); background: #fff6e8; color: var(--orange-dark); }
.chip-btn.chip-wrong { border-color: var(--red); background: #fff0f0; color: #d13a3a; }
.chip-btn:disabled { cursor: default; }

/* Basamak Makinesi (place value counting machine) */
.basamak-shell { max-width: 780px; margin: 0 auto; }
.big-number-display {
  text-align: center;
  font-weight: 700;
  color: var(--ink-soft);
  margin-bottom: 6px;
  font-size: 1.1rem;
}
.basamak-number-row {
  position: relative;
  display: flex;
  justify-content: center;
  gap: 16px;
  margin: 18px 0 24px;
  flex-wrap: wrap;
  perspective: 600px;
}
.digit-box {
  position: relative;
  width: 100px;
  height: 122px;
  background: #fff;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Baloo 2', sans-serif;
  font-weight: 800;
  font-size: 3rem;
  color: var(--purple-dark);
  transition: box-shadow 0.25s ease;
}
.digit-box .digit-label {
  position: absolute;
  bottom: 8px;
  left: 0;
  right: 0;
  text-align: center;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--ink-soft);
  letter-spacing: 0.03em;
}
.digit-box.flip .digit-value { animation: digit-flip 0.35s ease; display: inline-block; }
@keyframes digit-flip {
  0% { transform: rotateX(90deg); opacity: 0.3; }
  60% { transform: rotateX(-15deg); opacity: 1; }
  100% { transform: rotateX(0); opacity: 1; }
}
.digit-box.carry-glow { box-shadow: 0 0 0 5px var(--orange), var(--shadow); }
.digit-box.borrow-glow { box-shadow: 0 0 0 5px var(--pink), var(--shadow); }

.carry-particle {
  position: absolute;
  top: -10px;
  font-family: 'Baloo 2', sans-serif;
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--orange-dark);
  pointer-events: none;
  animation: carry-fly 0.75s ease forwards;
  z-index: 5;
}
.carry-particle.borrow { color: var(--pink); }
@keyframes carry-fly {
  0% { opacity: 1; transform: translate(0, 0) scale(1); }
  100% { opacity: 0; transform: translate(var(--fly-x, -126px), -60px) scale(1.25); }
}

.control-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-bottom: 14px;
}
.toggle-btn {
  padding: 10px 20px;
  border-radius: 999px;
  border: 2px solid #e4dffc;
  background: #fff;
  font-weight: 700;
  font-family: 'Nunito', sans-serif;
  cursor: pointer;
  color: var(--ink);
}
.toggle-btn.active { background: var(--purple); color: #fff; border-color: var(--purple); }
.caption-box {
  text-align: center;
  min-height: 3.2em;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--purple-dark);
  background: #fff;
  border-radius: var(--radius-md);
  padding: 14px 20px;
  box-shadow: var(--shadow-sm);
  margin: 6px 0 22px;
}

/* Result screen */
.result-screen { text-align: center; padding: 20px 0; }
.result-stars { font-size: 3rem; margin: 14px 0; }
.result-stat-row { display: flex; justify-content: center; gap: 26px; margin: 22px 0; flex-wrap: wrap; }
.result-stat { background: #fff; border-radius: var(--radius-md); padding: 16px 24px; box-shadow: var(--shadow-sm); min-width: 110px; }
.result-stat .value { font-family: 'Baloo 2', sans-serif; font-weight: 800; font-size: 1.6rem; color: var(--purple-dark); }
.result-stat .label { color: var(--ink-soft); font-size: 0.85rem; }

.confetti-piece {
  position: fixed;
  top: -20px;
  width: 10px;
  height: 16px;
  opacity: 0.9;
  animation: confetti-fall linear forwards;
  z-index: 999;
}
@keyframes confetti-fall {
  to { transform: translateY(105vh) rotate(540deg); opacity: 0.3; }
}

@keyframes pop-in {
  0% { transform: scale(0.7); opacity: 0; }
  100% { transform: scale(1); opacity: 1; }
}
.pop-in { animation: pop-in 0.25s ease; }

@keyframes shake {
  10%, 90% { transform: translateX(-2px); }
  20%, 80% { transform: translateX(4px); }
  30%, 50%, 70% { transform: translateX(-8px); }
  40%, 60% { transform: translateX(8px); }
}
.shake { animation: shake 0.4s; }