/* ============================================
   GEOMETRY LAB — Neon Geometry Lab Theme
   ============================================ */

:root {
  --bg-deep:    #0b0e1a;
  --bg-canvas:  #101428;
  --bg-card:    #161a30;
  --grid-dot:   #1e2345;
  --neon-cyan:  #00f0d4;
  --neon-pink:  #ff2d78;
  --neon-yellow:#ffe145;
  --neon-purple:#b44dff;
  --neon-orange:#ff8a3d;
  --neon-green: #39ff7f;
  --text-main:  #e4e6f0;
  --text-dim:   #8489a8;
  --radius:     14px;
  --glow-cyan:  0 0 12px rgba(0,240,212,.45), 0 0 40px rgba(0,240,212,.15);
  --glow-pink:  0 0 12px rgba(255,45,120,.45), 0 0 40px rgba(255,45,120,.15);
}

/* ---------- RESET ---------- */
*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }

html, body {
  height: 100%;
  overflow: hidden;
  background: var(--bg-deep);
  color: var(--text-main);
  font-family: 'Nunito', sans-serif;
  font-size: 16px;
  -webkit-tap-highlight-color: transparent;
  touch-action: none;
}

h1, h2, h3, strong { font-family: 'Fredoka', sans-serif; }

/* ---------- LAYOUT ---------- */
#app {
  display: flex;
  flex-direction: column;
  height: 100%;
}

#header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 20px;
  background: var(--bg-card);
  border-bottom: 1px solid #1f2440;
  flex-shrink: 0;
  gap: 12px;
  z-index: 10;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-icon {
  font-size: 28px;
  color: var(--neon-cyan);
  text-shadow: var(--glow-cyan);
  animation: pulse-glow 2s ease-in-out infinite;
}

.logo h1 {
  font-size: 1.35rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--neon-cyan), var(--neon-purple));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: .5px;
}

/* ---------- TOOLBAR ---------- */
#toolbar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.tool-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border: 2px solid #2a2e52;
  border-radius: 50px;
  background: var(--bg-deep);
  color: var(--text-dim);
  font-family: 'Fredoka', sans-serif;
  font-size: .85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all .2s ease;
  white-space: nowrap;
}

.tool-btn .btn-icon { font-size: 1.1rem; }

.tool-btn:hover {
  border-color: var(--neon-cyan);
  color: var(--neon-cyan);
  box-shadow: var(--glow-cyan);
}

.tool-btn.active {
  border-color: var(--neon-cyan);
  background: rgba(0,240,212,.1);
  color: var(--neon-cyan);
  box-shadow: var(--glow-cyan);
}

.tool-btn[data-mode="advanced"].active {
  border-color: var(--neon-purple);
  background: rgba(180,77,255,.1);
  color: var(--neon-purple);
  box-shadow: 0 0 12px rgba(180,77,255,.4);
}

.tool-btn[data-mode="game"].active {
  border-color: var(--neon-yellow);
  background: rgba(255,225,69,.1);
  color: var(--neon-yellow);
  box-shadow: 0 0 12px rgba(255,225,69,.4);
}

.clear-btn:hover {
  border-color: var(--neon-pink);
  color: var(--neon-pink);
  box-shadow: var(--glow-pink);
}

/* ---------- MAIN / CANVAS ---------- */
#main {
  flex: 1;
  display: flex;
  position: relative;
  overflow: hidden;
}

#canvas-wrap {
  flex: 1;
  position: relative;
  overflow: hidden;
}

#canvas {
  display: block;
  width: 100%;
  height: 100%;
  cursor: crosshair;
}

/* ---------- OVERLAYS ---------- */
.hidden { display: none !important; }

#shape-label {
  position: absolute;
  top: 16px;
  left: 50%;
  transform: translateX(-50%);
  padding: 8px 24px;
  border-radius: 50px;
  background: rgba(0,240,212,.12);
  border: 1px solid rgba(0,240,212,.35);
  color: var(--neon-cyan);
  font-family: 'Fredoka', sans-serif;
  font-size: 1.3rem;
  font-weight: 600;
  text-shadow: var(--glow-cyan);
  pointer-events: none;
  animation: slide-in-top .4s ease;
  z-index: 5;
  transition: top .25s ease;
}

/* Push shape label down when game prompt is also visible */
#shape-label.offset-for-prompt {
  top: 68px;
}

#angle-equation {
  position: absolute;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  padding: 10px 24px;
  border-radius: var(--radius);
  background: rgba(180,77,255,.1);
  border: 1px solid rgba(180,77,255,.3);
  color: var(--neon-purple);
  font-family: 'Fredoka', sans-serif;
  font-size: 1.05rem;
  font-weight: 500;
  text-shadow: 0 0 8px rgba(180,77,255,.4);
  pointer-events: none;
  z-index: 5;
  white-space: nowrap;
}

#game-prompt {
  position: absolute;
  top: 16px;
  left: 50%;
  transform: translateX(-50%);
  padding: 10px 16px 10px 28px;
  border-radius: 50px;
  background: rgba(255,225,69,.12);
  border: 2px solid rgba(255,225,69,.4);
  color: var(--neon-yellow);
  font-family: 'Fredoka', sans-serif;
  font-size: 1.2rem;
  font-weight: 600;
  text-shadow: 0 0 10px rgba(255,225,69,.4);
  pointer-events: auto;
  z-index: 6;
  animation: slide-in-top .4s ease;
  text-align: center;
  max-width: 90vw;
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ---------- GAME PANEL ---------- */
#game-panel {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  padding: 32px 36px;
  border-radius: 20px;
  background: var(--bg-card);
  border: 2px solid #2a2e52;
  box-shadow: 0 8px 40px rgba(0,0,0,.5);
  z-index: 20;
  text-align: center;
}

#game-panel h2 {
  font-size: 1.5rem;
  margin-bottom: 20px;
  color: var(--neon-yellow);
  text-shadow: 0 0 10px rgba(255,225,69,.3);
}

.game-level-btn {
  display: flex;
  align-items: center;
  gap: 16px;
  width: 100%;
  padding: 14px 20px;
  margin-bottom: 12px;
  border: 2px solid #2a2e52;
  border-radius: var(--radius);
  background: var(--bg-deep);
  color: var(--text-main);
  cursor: pointer;
  transition: all .25s ease;
  text-align: left;
}

.game-level-btn:hover {
  border-color: var(--neon-cyan);
  box-shadow: var(--glow-cyan);
}

.game-level-btn .level-num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--neon-cyan), var(--neon-purple));
  color: #fff;
  font-family: 'Fredoka', sans-serif;
  font-size: 1.4rem;
  font-weight: 700;
  flex-shrink: 0;
}

.game-level-btn .level-info strong {
  display: block;
  font-size: 1rem;
}

.game-level-btn .level-info small {
  color: var(--text-dim);
  font-size: .82rem;
}

/* ---------- SUCCESS BANNER ---------- */
#success-banner {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  padding: 28px 40px;
  border-radius: 20px;
  background: rgba(57,255,127,.1);
  border: 2px solid rgba(57,255,127,.4);
  box-shadow: 0 0 30px rgba(57,255,127,.2);
  text-align: center;
  z-index: 25;
  animation: pop-in .4s cubic-bezier(.17,.67,.24,1.27);
}

#success-text {
  display: block;
  font-family: 'Fredoka', sans-serif;
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--neon-green);
  text-shadow: 0 0 14px rgba(57,255,127,.5);
  margin-bottom: 16px;
}

.neon-btn {
  padding: 10px 28px;
  border: 2px solid var(--neon-cyan);
  border-radius: 50px;
  background: rgba(0,240,212,.1);
  color: var(--neon-cyan);
  font-family: 'Fredoka', sans-serif;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all .2s ease;
}

.neon-btn:hover {
  background: rgba(0,240,212,.2);
  box-shadow: var(--glow-cyan);
}

/* ---------- HINT BAR ---------- */
#hint-bar {
  position: absolute;
  bottom: 12px;
  left: 50%;
  transform: translateX(-50%);
  padding: 8px 20px;
  border-radius: 50px;
  background: rgba(132,137,168,.12);
  border: 1px solid rgba(132,137,168,.2);
  color: var(--text-dim);
  font-size: .85rem;
  pointer-events: none;
  z-index: 5;
  white-space: nowrap;
  max-width: 95vw;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ---------- HINT TOGGLE BUTTON ---------- */
.hint-toggle {
  background: rgba(255,225,69,.15);
  border: 1.5px solid rgba(255,225,69,.4);
  font-size: 1.15rem;
  cursor: pointer;
  margin-left: 12px;
  padding: 4px 10px;
  border-radius: 50px;
  transition: transform .2s, filter .2s, background .2s, box-shadow .2s;
  vertical-align: middle;
  line-height: 1;
  pointer-events: auto;
  animation: hint-pulse 2s ease-in-out 3;
}
.hint-toggle:hover {
  transform: scale(1.15);
  background: rgba(255,225,69,.25);
  box-shadow: 0 0 12px rgba(255,225,69,.4);
}
.hint-toggle.active {
  transform: scale(1.15);
  background: rgba(255,225,69,.3);
  box-shadow: 0 0 16px rgba(255,225,69,.5);
  border-color: rgba(255,225,69,.7);
}

@keyframes hint-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(255,225,69,0); }
  50% { box-shadow: 0 0 14px 4px rgba(255,225,69,.35); }
}

/* ---------- HINT CARD ---------- */
#hint-card {
  position: absolute;
  top: 64px;
  left: 50%;
  transform: translateX(-50%);
  max-width: 460px;
  width: 92vw;
  z-index: 8;
  animation: hint-card-in .35s ease;
  pointer-events: none;
}

@keyframes hint-card-in {
  from { opacity: 0; transform: translateX(-50%) translateY(-12px) scale(.96); }
  to   { opacity: 1; transform: translateX(-50%) translateY(0) scale(1); }
}

#hint-card-inner {
  background: rgba(22,26,48,.96);
  border: 2px solid rgba(255,225,69,.45);
  border-radius: 18px;
  padding: 20px 24px;
  backdrop-filter: blur(10px);
  box-shadow: 0 4px 30px rgba(255,225,69,.1), 0 0 0 1px rgba(255,225,69,.08);
}

#hint-card-desc {
  font-family: 'Fredoka', sans-serif;
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--neon-yellow);
  margin-bottom: 10px;
  line-height: 1.45;
  text-shadow: 0 0 8px rgba(255,225,69,.25);
}

#hint-card-tip {
  font-family: 'Nunito', sans-serif;
  font-size: .95rem;
  color: var(--text-main);
  line-height: 1.6;
}

/* ---------- TUTORIAL OVERLAY ---------- */
#tutorial-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(11,14,26,.88);
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(6px);
  animation: fade-in .4s ease;
}

#tutorial-overlay.hidden { display: none; }

#tutorial-modal {
  background: var(--bg-card);
  border: 2px solid #2a2e52;
  border-radius: 22px;
  padding: 40px 36px 28px;
  max-width: 440px;
  width: 90vw;
  text-align: center;
  box-shadow: 0 12px 60px rgba(0,0,0,.6);
}

.tutorial-page { min-height: 180px; }
.tutorial-page.hidden { display: none; }

.tutorial-icon {
  font-size: 3rem;
  margin-bottom: 16px;
  display: inline-block;
  animation: pulse-glow 2s ease-in-out infinite;
  color: var(--neon-cyan);
  text-shadow: var(--glow-cyan);
}

.tutorial-page h2 {
  font-family: 'Fredoka', sans-serif;
  font-size: 1.4rem;
  color: var(--neon-cyan);
  margin-bottom: 14px;
}

.tutorial-page p {
  font-family: 'Nunito', sans-serif;
  font-size: .95rem;
  line-height: 1.7;
  color: var(--text-main);
}

.tutorial-page p strong {
  color: var(--neon-yellow);
  font-family: 'Fredoka', sans-serif;
}

.tutorial-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 28px;
  gap: 12px;
}

.tutorial-dots {
  display: flex;
  gap: 8px;
}

.tutorial-dots .dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #2a2e52;
  transition: background .25s, box-shadow .25s;
}

.tutorial-dots .dot.active {
  background: var(--neon-cyan);
  box-shadow: 0 0 8px rgba(0,240,212,.5);
}

.tutorial-nav .neon-btn {
  min-width: 90px;
  font-size: .88rem;
  padding: 8px 18px;
}

.tutorial-nav .neon-btn:disabled {
  opacity: .3;
  cursor: default;
  pointer-events: none;
}

/* ---------- PROGRESS COUNTER ---------- */
#progress-counter {
  position: absolute;
  top: 60px;
  right: 16px;
  padding: 6px 14px;
  border-radius: 50px;
  background: rgba(255,45,120,.1);
  border: 1px solid rgba(255,45,120,.3);
  font-family: 'Fredoka', sans-serif;
  font-size: .9rem;
  font-weight: 600;
  color: var(--neon-pink);
  z-index: 5;
  pointer-events: none;
}

#progress-counter.hidden { display: none; }

/* ---------- ANIMATIONS ---------- */
@keyframes fade-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}


@keyframes pulse-glow {
  0%, 100% { opacity: 1; }
  50% { opacity: .65; text-shadow: 0 0 20px rgba(0,240,212,.7); }
}

@keyframes slide-in-top {
  from { opacity: 0; transform: translateX(-50%) translateY(-16px); }
  to   { opacity: 1; transform: translateX(-50%) translateY(0); }
}

@keyframes pop-in {
  from { opacity: 0; transform: translate(-50%,-50%) scale(.8); }
  to   { opacity: 1; transform: translate(-50%,-50%) scale(1); }
}

/* ---------- RESPONSIVE ---------- */
@media (max-width: 700px) {
  #header {
    flex-direction: column;
    padding: 8px 12px;
    gap: 8px;
  }
  .logo h1 { font-size: 1.1rem; }

  #toolbar { justify-content: center; }

  .tool-btn {
    padding: 6px 12px;
    font-size: .78rem;
  }
  .tool-btn .btn-label { display: none; }
  .tool-btn .btn-icon { font-size: 1.25rem; }

  #shape-label { font-size: 1rem; padding: 6px 16px; }
  #shape-label.offset-for-prompt { top: 58px; }
  #game-prompt { font-size: 1rem; padding: 8px 12px 8px 18px; }
  #angle-equation { font-size: .85rem; padding: 8px 16px; }

  #game-panel {
    width: 88vw;
    padding: 24px 20px;
  }

  #success-banner { width: 85vw; padding: 22px 20px; }
  #success-text { font-size: 1.3rem; }

  #hint-bar { font-size: .75rem; }

  #hint-card { max-width: 92vw; top: 52px; }
  #hint-card-inner { padding: 14px 16px; }
  #hint-card-desc { font-size: .95rem; }
  #hint-card-tip { font-size: .84rem; }

  #tutorial-modal { padding: 28px 22px 22px; }
  .tutorial-icon { font-size: 2.4rem; }
  .tutorial-page h2 { font-size: 1.2rem; }
  .tutorial-page p { font-size: .88rem; }
  .tutorial-page { min-height: 150px; }

  #progress-counter { font-size: .78rem; top: 52px; right: 10px; }
}

@media (max-width: 400px) {
  .tool-btn { padding: 6px 8px; gap: 0; }
}