/* ─────────────────────────────────────────────
   JMath – style.css
   Premium glassmorphism UI + animations
───────────────────────────────────────────── */

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

/* ── Tokens ─────────────────────────────────── */
:root {
  --bg-from:   #0f0c29;
  --bg-to:     #302b63;
  --glass-bg:  rgba(255, 255, 255, 0.08);
  --glass-border: rgba(255, 255, 255, 0.18);
  --accent:    #00c6ff;
  --accent2:   #0072ff;
  --success:   #00e676;
  --danger:    #ff5252;
  --text:      #f0f0f0;
  --text-muted:#b0b8d0;
  --radius:    16px;
  --shadow:    0 8px 32px rgba(0, 0, 0, 0.45);
  --transition: 0.28s ease;
}

[data-theme="light"] {
  --bg-from:   #e0ecff;
  --bg-to:     #c8d8f8;
  --glass-bg:  rgba(255, 255, 255, 0.55);
  --glass-border: rgba(120, 150, 220, 0.4);
  --accent:    #0072ff;
  --accent2:   #004fc8;
  --text:      #1a1a2e;
  --text-muted:#4a5568;
  --shadow:    0 8px 32px rgba(0, 80, 200, 0.15);
}

/* ── Base ───────────────────────────────────── */
body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Segoe UI', system-ui, sans-serif;
  background: linear-gradient(135deg, var(--bg-from), var(--bg-to));
  color: var(--text);
  transition: background var(--transition), color var(--transition);
  padding: 20px;
}

/* ── App container ──────────────────────────── */
#app {
  position: relative;
  width: min(480px, 100%);
  min-height: 360px;
  background: var(--glass-bg);
  backdrop-filter: blur(18px) saturate(180%);
  -webkit-backdrop-filter: blur(18px) saturate(180%);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 36px 32px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  animation: fadeSlideIn 0.4s ease both;
}

@keyframes fadeSlideIn {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Animate every inner content swap */
.screen-enter {
  animation: fadeSlideIn 0.35s ease both;
}

/* ── Typography ─────────────────────────────── */
h1 { font-size: 2rem; font-weight: 800; letter-spacing: -0.5px; }
h2 { font-size: 1.4rem; font-weight: 700; }
h3 { font-size: 1.1rem; font-weight: 600; }

.subtitle {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.5;
}

/* Typewriter cursor */
.typewriter::after {
  content: '|';
  animation: blink 1s step-end infinite;
}
@keyframes blink { 50% { opacity: 0; } }

/* ── Buttons ────────────────────────────────── */
button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 22px;
  border: none;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #fff;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition);
  box-shadow: 0 4px 14px rgba(0, 114, 255, 0.35);
}

button:hover  { transform: translateY(-2px) scale(1.04); box-shadow: 0 6px 20px rgba(0, 114, 255, 0.5); }
button:active { transform: scale(0.97); }

button.secondary {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--text);
  box-shadow: none;
}
button.secondary:hover { background: rgba(255,255,255,0.14); }

button.correct {
  background: linear-gradient(135deg, #00c853, var(--success));
  box-shadow: 0 4px 14px rgba(0, 200, 83, 0.4);
}
button.wrong {
  background: linear-gradient(135deg, #d50000, var(--danger));
  box-shadow: 0 4px 14px rgba(255, 82, 82, 0.4);
  animation: shake 0.4s ease;
}

@keyframes shake {
  0%,100% { transform: translateX(0); }
  20%     { transform: translateX(-8px); }
  40%     { transform: translateX(8px); }
  60%     { transform: translateX(-5px); }
  80%     { transform: translateX(5px); }
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
}

/* ── Module cards ───────────────────────────── */
.module-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  cursor: pointer;
  transition: transform var(--transition), background var(--transition);
  text-align: left;
  width: 100%;
  color: var(--text);
  box-shadow: none;
  background: rgba(255,255,255,0.06);
}
.module-card:hover { background: rgba(255,255,255,0.14); transform: translateX(4px); }
.module-card .icon { font-size: 1.8rem; flex-shrink: 0; }
.module-card .meta { flex: 1; }
.module-card .meta strong { display: block; font-size: 1rem; }
.module-card .meta span  { font-size: 0.8rem; color: var(--text-muted); }
.module-card .badge {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 20px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #fff;
  white-space: nowrap;
}
.module-card .badge.done { background: linear-gradient(135deg, #00c853, var(--success)); }

/* ── Progress bar ───────────────────────────── */
.progress-wrap {
  width: 100%;
  background: rgba(255,255,255,0.12);
  border-radius: 20px;
  height: 8px;
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  border-radius: 20px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  transition: width 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.progress-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-align: right;
}

/* ── Lesson content ─────────────────────────── */
.lesson-content {
  line-height: 1.7;
  font-size: 0.97rem;
}
.lesson-content code {
  background: rgba(0,0,0,0.25);
  padding: 2px 6px;
  border-radius: 5px;
  font-family: monospace;
  font-size: 0.92em;
}
.lesson-content .highlight {
  background: linear-gradient(135deg, rgba(0,198,255,0.2), rgba(0,114,255,0.1));
  border-left: 3px solid var(--accent);
  padding: 10px 14px;
  border-radius: 0 10px 10px 0;
  margin: 8px 0;
}

/* ── Quiz choices ───────────────────────────── */
.choices {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.choice-btn {
  text-align: left;
  background: rgba(255,255,255,0.08);
  border: 1px solid var(--glass-border);
  color: var(--text);
  box-shadow: none;
  font-weight: 500;
  justify-content: flex-start;
  padding: 13px 18px;
}
.choice-btn:hover { background: rgba(255,255,255,0.18); transform: translateX(4px); }
.choice-btn:disabled { cursor: default; transform: none; }

/* ── Score / Result ─────────────────────────── */
.result-score {
  font-size: 3.5rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}
.stars { font-size: 2rem; letter-spacing: 4px; }

/* ── Theme toggle ───────────────────────────── */
.theme-toggle {
  position: fixed;
  top: 16px;
  right: 16px;
  width: 44px;
  height: 44px;
  padding: 0;
  border-radius: 50%;
  font-size: 1.25rem;
  z-index: 1000;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(12px);
  color: var(--text);
  box-shadow: var(--shadow);
}
.theme-toggle:hover { transform: scale(1.12); }

/* ── Confetti canvas ────────────────────────── */
#confettiCanvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 999;
}

/* ── Divider ────────────────────────────────── */
hr {
  border: none;
  border-top: 1px solid var(--glass-border);
}

/* ── Scrollbar ──────────────────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--glass-border); border-radius: 3px; }