/* ── Fonts ── */
@import url('https://fonts.googleapis.com/css2?family=Lora:ital,wght@0,400;0,600;1,400&family=DM+Sans:wght@400;500;600;700&display=swap');

/* ── Design tokens ── */
:root {
  --bg:           #f5f0eb;
  --card:         #ffffff;
  --text:         #2c2c2c;
  --muted:        #6b6469;
  --border:       #ddd5c8;
  --green:        #4a7c59;
  --green-light:  #e6f0ea;
  --green-dark:   #3a6347;
  --amber:        #c17f3a;
  --amber-light:  #fdf3e7;
  --red:          #c0392b;
  --red-light:    #fdecea;
  --yellow:       #d4a017;
  --yellow-light: #fdf8e1;
  --shadow-sm:    0 1px 3px rgba(0,0,0,.08);
  --shadow-md:    0 4px 16px rgba(0,0,0,.10);
  --radius:       12px;
  --radius-sm:    8px;
  --transition:   0.2s ease;
}

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

/* height:100% on both lets content overflow naturally to the document scroll layer,
   which every browser handles correctly including DuckDuckGo on Android. */
html {
  scroll-behavior: smooth;
  height: 100%;
  background: var(--bg); /* extends bg below body when content is short */
}
body {
  font-family: 'DM Sans', sans-serif;
  background: var(--bg);
  color: var(--text);
  height: 100%;
  line-height: 1.6;
  padding: 0;
  touch-action: pan-y pinch-zoom;
}

/* ── Layout ── */
.app-wrapper {
  max-width: 680px;
  margin: 0 auto;
  padding: 24px 16px 48px;
  /* overflow-y: auto — safe universal default.
     Without a fixed height on this container, auto never creates a scroll trap.
     The document-level scroll handles all vertical scrolling on every browser. */
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;  /* iOS Safari momentum scroll — harmless elsewhere */
  touch-action: pan-y;               /* pass vertical touch gestures to native scroll */
}

/* Chrome on iOS scroll fixes — applied ONLY when body.ios-chrome is present,
   which is set only when CriOS AND iPhone/iPad are both in the user agent.
   Safari, Android Chrome, and DuckDuckGo are never affected. */
.ios-chrome .app-wrapper {
  overflow-y: scroll;                /* CriOS requires explicit scroll declaration */
  -webkit-overflow-scrolling: auto;  /* remove Safari-specific hint; interferes with CriOS */
  overscroll-behavior-y: none;       /* suppress bounce/jump on scroll edges */
  transform: translateZ(0);          /* GPU compositing layer for smoother CriOS scroll */
}

/* ── Header ── */
.app-header {
  text-align: center;
  margin-bottom: 28px;
  position: relative;
}

/* ── Home button ── */
.home-btn {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  cursor: pointer;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--muted);
  padding: 8px 10px;
  display: flex;
  align-items: center;
  gap: 5px;
  border-radius: var(--radius-sm);
  min-height: 36px;
  transition: color var(--transition), background var(--transition);
  -webkit-tap-highlight-color: transparent;
}
.home-btn:hover,
.home-btn:active { color: var(--text); background: rgba(0,0,0,0.06); }
.app-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}
.logo-icon {
  font-size: 1.6rem;
  line-height: 1;
}
.logo-text {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--green);
  letter-spacing: -0.5px;
}
.logo-tagline {
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 2px;
  letter-spacing: 0.02em;
}

/* ── Step indicator ── */
.step-indicator {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  margin-bottom: 28px;
}
.step-dot {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--border);
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  z-index: 1;
  transition: background var(--transition), color var(--transition);
}
.step-dot.active {
  background: var(--green);
  color: #fff;
}
.step-dot.done {
  background: var(--green-light);
  color: var(--green);
}
.step-line {
  flex: 1;
  height: 2px;
  background: var(--border);
  max-width: 80px;
  transition: background var(--transition);
}
.step-line.done {
  background: var(--green-light);
}

/* ── Card ── */
.card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 28px 24px;
  box-shadow: var(--shadow-sm);
  margin-bottom: 16px;
}
.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--green);
  margin-bottom: 6px;
}
.card-subtitle {
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 20px;
}

/* ── Screens ── */
.screen { display: none; }
.screen.active { display: block; }

/* ── Form elements ── */
.field { margin-bottom: 20px; }
.field label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 8px;
  color: var(--text);
}
.field-hint {
  font-size: 0.78rem;
  color: var(--muted);
  margin-top: 4px;
}

/* Level selector */
.level-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.level-option {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 16px;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
  background: var(--card);
}
.level-option:hover { border-color: var(--green); background: var(--green-light); }
.level-option input[type="radio"] { display: none; }
.level-option.selected { border-color: var(--green); background: var(--green-light); }
.level-badge {
  min-width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--muted);
  transition: background var(--transition), color var(--transition);
  flex-shrink: 0;
}
.level-option.selected .level-badge {
  background: var(--green);
  color: #fff;
}
.level-info strong {
  display: block;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text);
}
.level-info span {
  font-size: 0.8rem;
  color: var(--muted);
}

/* Length selector */
.length-options {
  display: flex;
  gap: 10px;
}
.length-option {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 14px 8px;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
  background: var(--card);
  text-align: center;
}
.length-option input[type="radio"] { display: none; }
.length-option:hover { border-color: var(--amber); background: var(--amber-light); }
.length-option.selected { border-color: var(--amber); background: var(--amber-light); }
.length-num {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--amber);
}
.length-label {
  font-size: 0.75rem;
  color: var(--muted);
  margin-top: 2px;
}

/* Text input */
.text-input {
  width: 100%;
  padding: 12px 14px;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: 'DM Sans', sans-serif;
  font-size: 1rem;
  color: var(--text);
  background: #fff;
  transition: border-color var(--transition);
  outline: none;
}
.text-input:focus { border-color: var(--green); }

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 24px;
  border-radius: var(--radius-sm);
  font-family: 'DM Sans', sans-serif;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  border: none;
  transition: background var(--transition), transform 0.1s, opacity var(--transition);
  text-decoration: none;
}
.btn:active { transform: scale(0.98); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-primary {
  background: var(--green);
  color: #fff;
  width: 100%;
}
.btn-primary:hover:not(:disabled) { background: var(--green-dark); }

.btn-secondary {
  background: transparent;
  color: var(--green);
  border: 2px solid var(--green);
  width: 100%;
}
.btn-secondary:hover:not(:disabled) { background: var(--green-light); }

.btn-amber {
  background: var(--amber);
  color: #fff;
  width: 100%;
}
.btn-amber:hover:not(:disabled) { background: #a56b2f; }

.btn-sm {
  padding: 9px 18px;
  font-size: 0.9rem;
}

.btn-row {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 20px;
}

/* ── Loading spinner ── */
.spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid rgba(255,255,255,0.4);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  flex-shrink: 0;
}
.spinner.green {
  border-color: rgba(74,124,89,0.3);
  border-top-color: var(--green);
}
@keyframes spin { to { transform: rotate(360deg); } }

.loading-card {
  text-align: center;
  padding: 40px 24px;
}
.loading-card p {
  color: var(--muted);
  margin-top: 16px;
  font-size: 0.95rem;
}
.loading-card .spinner {
  width: 36px;
  height: 36px;
  margin: 0 auto;
}

/* ── Passage display ── */
.passage-text {
  font-family: 'Lora', serif;
  font-size: 1.08rem;
  line-height: 1.85;
  color: var(--text);
  white-space: pre-wrap;
}
.passage-text p { margin-bottom: 1.1em; }
.passage-text p:last-child { margin-bottom: 0; }

.passage-meta {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}
.badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.03em;
}
.badge-green { background: var(--green-light); color: var(--green); }
.badge-amber { background: var(--amber-light); color: var(--amber); }

/* ── Vocabulary grid ── */
.vocab-instructions {
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 16px;
  line-height: 1.5;
}
.vocab-counter {
  font-weight: 700;
  color: var(--green);
  font-size: 0.95rem;
  margin-bottom: 12px;
}
.word-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 20px;
}
@media (min-width: 480px) {
  .word-grid { grid-template-columns: repeat(4, 1fr); }
}
@media (min-width: 600px) {
  .word-grid { grid-template-columns: repeat(5, 1fr); }
}
.word-chip {
  padding: 10px 6px;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  background: #fff;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text);
  cursor: pointer;
  text-align: center;
  transition: border-color var(--transition), background var(--transition), color var(--transition);
  word-break: break-word;
  touch-action: manipulation;  /* tap without blocking scroll on the grid */
}
.word-chip:hover:not(.revealed) { border-color: var(--green); background: var(--green-light); }
.word-chip.selected {
  border-color: var(--green);
  background: var(--green);
  color: #fff;
}
/* Revealed states after submission */
.word-chip.result-correct {
  border-color: #27ae60;
  background: #e8f8ee;
  color: #1a7a3f;
  cursor: default;
}
.word-chip.result-wrong {
  border-color: var(--red);
  background: var(--red-light);
  color: var(--red);
  cursor: default;
}
.word-chip.result-missed {
  border-color: var(--yellow);
  background: var(--yellow-light);
  color: #8a6800;
  cursor: default;
}
.word-chip.result-neutral {
  border-color: var(--border);
  background: #f8f8f8;
  color: var(--muted);
  cursor: default;
}
.word-chip .chip-icon {
  display: block;
  font-size: 0.7rem;
  margin-top: 2px;
}

/* Vocab results summary */
.vocab-results-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 16px;
  font-size: 0.82rem;
}
.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
}
.legend-dot {
  width: 12px;
  height: 12px;
  border-radius: 3px;
  flex-shrink: 0;
}
.legend-dot.correct  { background: #27ae60; }
.legend-dot.wrong    { background: var(--red); }
.legend-dot.missed   { background: var(--yellow); }

.vocab-score-box {
  background: var(--green-light);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  margin-bottom: 20px;
  text-align: center;
}
.vocab-score-num {
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--green);
  line-height: 1;
}
.vocab-score-label {
  font-size: 0.85rem;
  color: var(--green);
  margin-top: 4px;
}
.vocab-encouragement {
  font-size: 0.9rem;
  color: var(--muted);
  margin-top: 8px;
}

/* ── Summary / Screen 4 ── */
.mode-toggle {
  display: flex;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin-bottom: 20px;
}
.mode-btn {
  flex: 1;
  padding: 10px;
  background: transparent;
  border: none;
  cursor: pointer;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--muted);
  transition: background var(--transition), color var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}
.mode-btn.active {
  background: var(--green);
  color: #fff;
}

.summary-textarea {
  width: 100%;
  min-height: 120px;
  padding: 14px;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: 'Lora', serif;
  font-size: 1.02rem;
  line-height: 1.7;
  color: var(--text);
  resize: vertical;
  transition: border-color var(--transition);
  outline: none;
  background: #fff;
}
.summary-textarea:focus { border-color: var(--green); }

/* Microphone UI */
.mic-permission-notice {
  background: var(--amber-light);
  border: 1px solid #e8c88a;
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  font-size: 0.83rem;
  color: #7a5a20;
  margin-bottom: 14px;
  line-height: 1.5;
}
.mic-permission-notice strong { color: var(--amber); }

/* iOS Chrome: voice unavailable notice below textarea */
.ios-type-notice {
  font-size: 0.78rem;
  color: var(--muted);
  margin-top: 8px;
  line-height: 1.5;
}

.mic-controls {
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: center;
}
.mic-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 32px;
  min-height: 52px;        /* iOS/Android minimum touch target */
  min-width: 200px;
  border-radius: 50px;
  border: none;
  font-family: 'DM Sans', sans-serif;
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  touch-action: manipulation;       /* prevent double-tap zoom on mobile */
  -webkit-tap-highlight-color: transparent;
  transition: background var(--transition), transform 0.1s;
  position: relative;
  z-index: 1;
}
.mic-btn:active { transform: scale(0.97); }
.mic-btn.idle     { background: var(--green); color: #fff; }
.mic-btn.idle:hover { background: var(--green-dark); }
.mic-btn.recording { background: var(--red); color: #fff; animation: pulse-bg 1.2s ease-in-out infinite; }

@keyframes pulse-bg {
  0%, 100% { box-shadow: 0 0 0 0 rgba(192,57,43,0.4); }
  50%       { box-shadow: 0 0 0 12px rgba(192,57,43,0); }
}

.recording-indicator {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--red);
  font-weight: 600;
}
.rec-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--red);
  animation: blink 1s step-start infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.mic-transcript-preview {
  width: 100%;
  font-size: 0.82rem;
  color: var(--muted);
  font-style: italic;
  text-align: center;
  min-height: 20px;
}

/* ── Feedback two-card display ── */
.fb-card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 20px 22px;
  box-shadow: var(--shadow-sm);
  margin-bottom: 14px;
  border-left: 4px solid var(--green);
}
.fb-card-vocab {
  border-left-color: var(--amber);
}
.fb-card-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--green);
  margin-bottom: 10px;
}
.fb-card-vocab .fb-card-label {
  color: var(--amber);
}
.fb-score-row {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 8px;
}
.fb-fraction {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--amber);
  line-height: 1;
  letter-spacing: -1px;
}
.fb-score-msg {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--amber);
}
.fb-card-text {
  font-size: 0.97rem;
  line-height: 1.72;
  color: var(--text);
  margin: 0;
}
.fb-words-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 8px;
}

.feedback-section {
  margin-bottom: 16px;
}
.feedback-section-title {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: 6px;
}
.feedback-section p {
  font-size: 0.95rem;
  color: var(--text);
  line-height: 1.6;
}
.feedback-divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 16px 0;
}

.words-used-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 8px;
}
.words-used-list .word-tag {
  padding: 4px 10px;
  background: var(--green-light);
  color: var(--green);
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 600;
}

.closing-card {
  background: linear-gradient(135deg, #fdf8f0, var(--amber-light));
  border-radius: var(--radius);
  padding: 20px;
  border-left: 4px solid var(--amber);
}
.closing-card p {
  font-family: 'Lora', serif;
  font-size: 1rem;
  line-height: 1.7;
  color: #5a3a10;
  font-style: italic;
}

.btn-new-session {
  margin-top: 24px;
}

/* ── Error message ── */
.error-msg {
  background: var(--red-light);
  border: 1px solid #f0b0a8;
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  font-size: 0.88rem;
  color: var(--red);
  margin-top: 12px;
  display: none;
}
.error-msg.visible { display: block; }

/* ── Utility ── */
.hidden { display: none !important; }
.mt-8  { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-20 { margin-top: 20px; }
.text-center { text-align: center; }
.text-muted  { color: var(--muted); font-size: 0.88rem; }

/* ── Home confirmation modal ── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  padding: 20px;
}
.modal-box {
  background: #fff;
  border-radius: 16px;
  padding: 30px 24px 24px;
  max-width: 320px;
  width: 100%;
  text-align: center;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.25);
}
.modal-msg {
  font-size: 1rem;
  line-height: 1.65;
  color: var(--text);
  margin-bottom: 22px;
}
.modal-btns {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* ── Mobile tweaks ── */
@media (max-width: 400px) {
  .card { padding: 20px 16px; }
  .feedback-score { flex-direction: column; text-align: center; }
  .btn-row { gap: 8px; }
}