/* ============================================================
   SlayerX Typing — lesson.css
   Interactive, Reactive Typing Arena with Caret Animation
   ============================================================ */

.lesson-body {
  background-color: var(--bg-body);
  min-height: 100vh;
}

/* ── Top Bar ────────────────────────────────────────────────── */
.lesson-topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  max-width: 900px;
  margin: 28px auto 12px;
  padding: 0 16px;
}

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

.lesson-title-text {
  font-family: 'Outfit', sans-serif;
  font-weight: 900;
  font-size: 1.6rem;
  color: var(--text-main);
  letter-spacing: -0.02em;
}

.lesson-stats-row {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.stat-pill {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
  color: var(--text-main);
  box-shadow: var(--shadow-sm);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.stat-pill span {
  color: var(--primary);
  font-weight: 800;
}

.stat-pill-btn {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
  color: var(--text-muted);
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: all 0.2s;
}

.stat-pill-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.stat-pill-btn.active,
.btn-mode.active-strict {
  background: var(--primary) !important;
  color: white !important;
  border-color: var(--primary-dark) !important;
  box-shadow: 0 4px 12px var(--primary-glow);
}

/* ── Progress Bar ───────────────────────────────────────────── */
.progress-bar-wrap {
  max-width: 900px;
  margin: 10px auto 20px;
  padding: 0 16px;
}

.progress-bar {
  height: 8px;
  background: var(--border-subtle);
  border-radius: 999px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 999px;
  transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── Typing Arena ───────────────────────────────────────────── */
.typing-arena {
  max-width: 900px;
  margin: 0 auto 40px;
  padding: 40px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 28px;
  box-shadow: var(--shadow-arena);
  text-align: center;
  position: relative;
  cursor: text;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.typing-arena:hover,
.typing-arena:focus-within {
  border-color: var(--border-active);
  box-shadow: var(--shadow-hover);
}

.word-meta-card {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.meta-exam {
  background: rgba(79, 70, 229, 0.1);
  color: var(--primary);
  font-size: 12px;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: 999px;
}

.meta-exams {
  font-size: 12px;
  color: var(--text-dim);
  font-weight: 600;
}

.meta-mistake {
  font-size: 13px;
  color: var(--error);
  margin-left: 8px;
}

.meta-mistake code {
  background: var(--error-bg);
  color: var(--error);
  padding: 2px 8px;
  border-radius: 6px;
  font-weight: 800;
  font-family: 'JetBrains Mono', monospace;
}

.word-prompt {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-dim);
  font-weight: 800;
  margin-bottom: 14px;
}

/* ── Reactive Word Display ──────────────────────────────────── */
.word-display {
  font-family: 'JetBrains Mono', 'Outfit', monospace;
  font-size: clamp(2.4rem, 6vw, 3.8rem);
  font-weight: 700;
  letter-spacing: 0.04em;
  margin: 16px 0 24px;
  min-height: 80px;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  user-select: none;
}

.char-row {
  display: inline-flex;
  align-items: baseline;
  gap: 3px;
  padding: 4px 8px;
  background: transparent;
  border: none;
}

.char {
  display: inline-block;
  padding: 0 2px;
  border: none !important;
  outline: none !important;
  background: transparent !important;
  position: relative;
  line-height: 1.15;
  transition: color 0.1s ease;
}

.char.pending {
  color: var(--char-pending);
  opacity: 0.65;
  background: transparent !important;
  border: none !important;
}

/* Caret / Active indicator: underline indicator without bulky box */
.char.active {
  color: var(--text-main);
  background: transparent !important;
  border: none !important;
}

.char.active::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -4px;
  height: 3px;
  width: 100%;
  background: var(--primary);
  border-radius: 2px;
  animation: blink 0.8s infinite;
}

.char.correct {
  color: var(--char-correct);
  background: transparent !important;
  border: none !important;
  font-weight: 700;
}

.char.wrong {
  color: var(--char-wrong);
  background: transparent !important;
  border: none !important;
  border-bottom: 3px solid var(--char-wrong) !important;
  font-weight: 700;
}

.char.char-lock-error {
  color: var(--error) !important;
  background: transparent !important;
  border: none !important;
  box-shadow: none !important;
  border-bottom: 3px solid var(--error) !important;
  animation: shake 0.3s ease-in-out;
}

/* ── Seamless Bottom-Only Input ─────────────────────────────── */
.input-wrap {
  margin: 24px auto 14px;
  max-width: 460px;
}

.typing-input {
  width: 100%;
  padding: 12px 14px;
  font-size: 1.4rem;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 700;
  text-align: center;
  border: none !important;
  border-bottom: 2px solid var(--border-strong) !important;
  border-radius: 0 !important;
  outline: none !important;
  background: transparent !important;
  color: var(--text-main);
  box-shadow: none !important;
  transition: border-bottom-color 0.2s ease, color 0.2s ease;
}

.typing-input:focus {
  border-bottom-color: var(--primary) !important;
  background: transparent !important;
  box-shadow: none !important;
}

.typing-input::placeholder {
  color: var(--text-dim);
  font-weight: 500;
  opacity: 0.6;
}

/* Feedback notifications */
.feedback-row {
  min-height: 28px;
  margin: 8px 0;
}

.feedback-correct {
  color: var(--success);
  font-weight: 700;
  font-size: 14px;
  display: none;
  animation: fadeIn 0.2s ease-out;
}

.feedback-wrong {
  color: var(--error);
  font-weight: 700;
  font-size: 13px;
  display: none;
  animation: fadeIn 0.2s ease-out;
}

.feedback-wrong kbd {
  background: var(--bg-alt);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 11px;
}

/* Buttons */
.arena-actions {
  display: flex;
  justify-content: center;
  gap: 14px;
  margin-top: 24px;
}

.btn-skip, .btn-mode {
  background: var(--bg-alt);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  font-weight: 700;
  font-size: 13px;
  padding: 9px 20px;
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-skip:hover, .btn-mode:hover {
  background: var(--border-subtle);
  color: var(--text-main);
  transform: translateY(-1px);
}

.btn-mode.active {
  background: var(--error);
  color: white;
  border-color: var(--error);
}

/* ── Keyframe Animations ────────────────────────────────────── */
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-8px); }
  40%, 80% { transform: translateX(8px); }
}

.shake {
  animation: shake 0.35s ease-in-out;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

@keyframes pulse-caret {
  0% { transform: scale(1); }
  100% { transform: scale(1.03); }
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ── Summary Card ───────────────────────────────────────────── */
.summary-card {
  max-width: 640px;
  margin: 30px auto;
  padding: 44px 32px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 28px;
  box-shadow: var(--shadow-arena);
  text-align: center;
  animation: fadeIn 0.3s ease-out;
}

.summary-header h2 {
  font-size: 2.2rem;
  margin-bottom: 24px;
}

.summary-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 28px;
}

.summary-stat {
  background: var(--bg-alt);
  border: 1px solid var(--border-subtle);
  padding: 18px 8px;
  border-radius: 18px;
}

.summary-num {
  display: block;
  font-family: 'Outfit', sans-serif;
  font-size: 2rem;
  font-weight: 900;
  color: var(--primary);
  line-height: 1.1;
  margin-bottom: 4px;
}

.summary-label {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-dim);
  text-transform: uppercase;
}

.missed-title {
  font-size: 1.15rem;
  margin: 24px 0 14px;
  text-align: left;
}

.missed-list {
  text-align: left;
  max-height: 240px;
  overflow-y: auto;
  margin-bottom: 24px;
  padding-right: 6px;
}

.summary-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.btn-retry {
  background: var(--error);
  color: white;
  border: none;
  font-weight: 700;
  padding: 12px 24px;
  border-radius: 12px;
  box-shadow: 0 4px 14px rgba(239, 68, 68, 0.3);
  transition: transform 0.15s;
}

.btn-retry:hover {
  transform: translateY(-2px);
}