:root {
  --bg: #0f172a;
  --bg-2: #1e293b;
  --card: #1e293b;
  --border: #334155;
  --text: #f1f5f9;
  --muted: #94a3b8;
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  --accent: #06b6d4;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
}
.container { max-width: 880px; margin: 0 auto; padding: 24px; }

/* NAV */
nav {
  background: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  padding: 12px 24px;
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}
nav .brand { font-weight: 700; color: var(--accent); font-size: 1.1rem; text-decoration: none; }
nav .links { display: flex; gap: 16px; flex-wrap: wrap; }
nav .links a { color: var(--muted); text-decoration: none; font-size: 0.95rem; transition: color 0.15s; }
nav .links a:hover, nav .links a.active { color: var(--text); }
nav .streak { font-size: 0.85rem; color: var(--warning); }

header { text-align: center; padding: 32px 0 16px; }
h1 { font-size: 2rem; margin-bottom: 8px; background: linear-gradient(90deg, #6366f1, #06b6d4); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.subtitle { color: var(--muted); font-size: 0.95rem; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  margin: 16px 0;
}
.card h2 { font-size: 1.3rem; margin-bottom: 12px; color: var(--text); }
.card h3 { font-size: 1.05rem; margin: 16px 0 8px; color: var(--accent); }

.btn {
  display: inline-block;
  background: var(--primary);
  color: white;
  border: none;
  padding: 12px 24px;
  border-radius: 8px;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
  font-weight: 500;
}
.btn:hover { background: var(--primary-hover); transform: translateY(-1px); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }
.btn-secondary { background: var(--bg-2); border: 1px solid var(--border); }
.btn-secondary:hover { background: var(--border); }
.btn-small { padding: 8px 14px; font-size: 0.85rem; }
.btn-danger { background: var(--danger); }
.btn-success { background: var(--success); }
.active-mode { background: var(--primary); border-color: var(--primary); }

/* Tappable words in speaking prompts */
.prompt-word {
  cursor: pointer;
  border-radius: 4px;
  padding: 1px 3px;
  transition: background 0.15s;
}
.prompt-word:hover {
  background: rgba(99, 102, 241, 0.25);
}
.prompt-word:active {
  background: rgba(99, 102, 241, 0.5);
}

/* i18n based on user level — applied by adding lang-es / lang-bi / lang-en to body */
body.lang-es .i18n-en { display: none; }
body.lang-en .i18n-es { display: none; }
body.lang-bi .i18n-es { display: block; color: var(--muted); font-size: 0.82em; margin-top: 2px; font-style: italic; }
body.lang-bi label .i18n-es,
body.lang-bi h1 .i18n-es,
body.lang-bi h2 .i18n-es,
body.lang-bi h3 .i18n-es,
body.lang-bi p .i18n-es { display: inline; margin-left: 4px; }

.progress {
  background: var(--bg-2);
  height: 8px;
  border-radius: 4px;
  overflow: hidden;
  margin: 16px 0;
}
.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transition: width 0.3s;
}

.question { margin-bottom: 24px; }
.question-meta {
  font-size: 0.8rem;
  color: var(--muted);
  margin-bottom: 8px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.level-badge {
  display: inline-block;
  background: var(--bg-2);
  border: 1px solid var(--border);
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
}
.question-text { font-size: 1.05rem; margin-bottom: 16px; }
.question-context {
  background: var(--bg-2);
  padding: 12px 16px;
  border-left: 3px solid var(--accent);
  border-radius: 4px;
  margin-bottom: 12px;
  color: var(--text);
}

.options { display: flex; flex-direction: column; gap: 8px; }
.option {
  background: var(--bg-2);
  border: 1px solid var(--border);
  padding: 12px 16px;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.15s;
  text-align: left;
  color: var(--text);
  font-size: 0.95rem;
}
.option:hover { border-color: var(--primary); background: #2a3548; }
.option.selected { border-color: var(--primary); background: #312e81; }

.self-rate { display: flex; gap: 8px; flex-wrap: wrap; }
.self-rate button {
  flex: 1;
  min-width: 90px;
  padding: 10px;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  cursor: pointer;
  font-size: 0.85rem;
}
.self-rate button.selected { border-color: var(--primary); background: #312e81; }

.listen-btn {
  background: var(--accent);
  color: #0f172a;
  border: none;
  padding: 10px 20px;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
  margin-bottom: 12px;
}
.listen-btn:hover { background: #0891b2; }

.nav-buttons { display: flex; justify-content: space-between; margin-top: 24px; gap: 12px; }

/* RESULTS */
.result-level {
  text-align: center;
  padding: 32px;
  background: linear-gradient(135deg, #312e81, #1e3a8a);
  border-radius: 12px;
  margin-bottom: 24px;
}
.result-level .big {
  font-size: 4rem;
  font-weight: 700;
  background: linear-gradient(90deg, #fbbf24, #fb923c);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.result-level .label { color: var(--muted); margin-top: 8px; }

.skill-bar { margin-bottom: 14px; }
.skill-bar-header { display: flex; justify-content: space-between; margin-bottom: 4px; font-size: 0.9rem; }
.skill-bar-bg { background: var(--bg-2); height: 12px; border-radius: 6px; overflow: hidden; }
.skill-bar-fill { height: 100%; background: linear-gradient(90deg, var(--primary), var(--accent)); }

.roadmap-step {
  padding: 12px;
  border-left: 3px solid var(--primary);
  background: var(--bg-2);
  border-radius: 0 8px 8px 0;
  margin-bottom: 10px;
}
.roadmap-step strong { color: var(--accent); }

/* RESOURCES */
.resource-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 12px; }
.resource-card {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  text-decoration: none;
  color: var(--text);
  transition: all 0.2s;
  display: block;
}
.resource-card:hover { border-color: var(--primary); transform: translateY(-2px); }
.resource-card h4 { color: var(--accent); margin-bottom: 6px; }
.resource-card p { font-size: 0.85rem; color: var(--muted); }
.resource-card .tag {
  display: inline-block;
  background: var(--bg);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.7rem;
  margin-top: 8px;
  color: var(--accent);
}
.resource-card .priority {
  float: right;
  background: var(--primary);
  color: white;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 600;
}

/* STREAK / DASHBOARD */
.streak-card {
  background: linear-gradient(135deg, #7c2d12 0%, #b45309 100%);
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 16px;
  text-align: center;
}
.streak-card.ok {
  background: linear-gradient(135deg, #065f46 0%, #047857 100%);
}
.streak-card.warning {
  background: linear-gradient(135deg, #7c2d12 0%, #991b1b 100%);
}
.streak-card .num { font-size: 3rem; font-weight: 700; }
.streak-card .label { font-size: 0.95rem; opacity: 0.9; }

.summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
  margin: 16px 0;
}
.stat-box {
  background: var(--bg-2);
  padding: 16px;
  border-radius: 8px;
  text-align: center;
}
.stat-box .num { font-size: 1.8rem; font-weight: 700; color: var(--accent); }
.stat-box .lab { font-size: 0.8rem; color: var(--muted); }

/* SPEAKING MODULE */
.speak-prompt {
  font-size: 1.6rem;
  text-align: center;
  padding: 32px 16px;
  background: var(--bg-2);
  border-radius: 12px;
  margin-bottom: 16px;
  line-height: 1.4;
}
.speak-translation {
  color: var(--muted);
  font-size: 0.9rem;
  text-align: center;
  font-style: italic;
  margin-bottom: 16px;
}
.speak-controls {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-bottom: 16px;
  flex-wrap: wrap;
}
.mic-btn {
  background: var(--danger);
  color: white;
  border: none;
  padding: 16px 32px;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
}
.mic-btn.recording {
  background: #dc2626;
  animation: pulse 1.5s infinite;
}
@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}
.speak-result {
  background: var(--bg-2);
  padding: 16px;
  border-radius: 8px;
  margin-top: 16px;
}
.speak-result .transcript-word {
  display: inline-block;
  padding: 2px 6px;
  margin: 2px;
  border-radius: 4px;
  font-weight: 500;
}
.speak-result .transcript-word.ok { background: rgba(16, 185, 129, 0.25); color: #6ee7b7; }
.speak-result .transcript-word.bad { background: rgba(239, 68, 68, 0.25); color: #fca5a5; text-decoration: line-through; }
.speak-result .transcript-word.missing { background: rgba(245, 158, 11, 0.25); color: #fcd34d; }
.speak-score {
  text-align: center;
  font-size: 2.5rem;
  font-weight: 700;
  margin: 16px 0;
}
.speak-score.high { color: var(--success); }
.speak-score.mid { color: var(--warning); }
.speak-score.low { color: var(--danger); }

/* MISC */
.hidden { display: none !important; }
.feedback-badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 0.85rem;
  font-weight: 600;
}
.feedback-badge.correct { background: rgba(16, 185, 129, 0.2); color: var(--success); }
.feedback-badge.incorrect { background: rgba(239, 68, 68, 0.2); color: var(--danger); }

.word-of-day {
  background: linear-gradient(135deg, #064e3b 0%, #134e4a 100%);
  border-radius: 12px;
  padding: 24px;
}
.word-of-day .word { font-size: 2rem; font-weight: 700; color: #fbbf24; }
.word-of-day .phonetic { color: var(--muted); font-style: italic; margin: 4px 0; }
.word-of-day .definition { margin: 12px 0; }
.word-of-day .example { color: var(--muted); font-style: italic; margin-top: 8px; }

footer { text-align:center; padding: 32px 0; color: var(--muted); font-size: 0.85rem; }

@media (max-width: 600px) {
  h1 { font-size: 1.5rem; }
  .container { padding: 16px; }
  .card { padding: 16px; }
  .speak-prompt { font-size: 1.2rem; padding: 20px 12px; }
  nav { flex-direction: column; align-items: stretch; }
  nav .links { justify-content: center; gap: 10px; font-size: 0.9rem; }

  /* Pomodoro widget smaller on phones */
  .pomo-widget {
    bottom: 12px !important;
    right: 12px !important;
    padding: 10px !important;
    min-width: 140px !important;
  }
  .pomo-widget .pomo-time { font-size: 1.4rem !important; }

  /* Stat boxes wider on small screens */
  .summary-grid { grid-template-columns: repeat(2, 1fr) !important; }

  /* Tables scroll horizontally on phone */
  table { font-size: 0.85rem; }
}