:root {
  --bg: #0f1416;
  --panel: #161d20;
  --panel-2: #1d262a;
  --border: #2a3438;
  --text: #eef2f3;
  --text-dim: #9fb0b5;
  --accent: #f4b41a;
  --accent-2: #2ea3a3;
  --good: #4caf6d;
  --bad: #e0605a;
  --radius: 14px;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  min-height: 100vh;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
  position: sticky;
  top: 0;
  z-index: 10;
  flex-wrap: wrap;
  gap: 10px;
}

.brand {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.3px;
}

.topnav { display: flex; gap: 8px; flex-wrap: wrap; }

.navbtn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
  padding: 7px 13px;
  border-radius: 999px;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 600;
  transition: all 0.15s ease;
}

.navbtn:hover { border-color: var(--accent-2); color: var(--text); }

.navbtn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #201800;
}

#app {
  max-width: 900px;
  margin: 0 auto;
  padding: 28px 20px 80px;
}

h1 { font-size: 1.7rem; margin: 0 0 6px; }
h2 { font-size: 1.3rem; margin: 0 0 12px; }
p.sub { color: var(--text-dim); margin-top: 0; }

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  margin-bottom: 18px;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

@media (max-width: 640px) {
  .grid-2 { grid-template-columns: 1fr; }
}

.big-action {
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: flex-start;
  padding: 26px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: linear-gradient(160deg, var(--panel-2), var(--panel));
  cursor: pointer;
  text-align: left;
  color: var(--text);
  transition: transform 0.12s ease, border-color 0.12s ease;
}

.big-action:hover { transform: translateY(-2px); border-color: var(--accent-2); }
.big-action .icon { font-size: 2rem; }
.big-action .title { font-size: 1.15rem; font-weight: 700; }
.big-action .desc { color: var(--text-dim); font-size: 0.9rem; }

.pill {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 999px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  font-size: 0.8rem;
  color: var(--accent);
  font-weight: 700;
}

.btn {
  background: var(--accent);
  color: #201800;
  border: none;
  padding: 10px 20px;
  border-radius: 10px;
  font-weight: 700;
  cursor: pointer;
  font-size: 0.95rem;
}
.btn:hover { filter: brightness(1.08); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.btn.secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
.btn.secondary:hover { border-color: var(--accent-2); }

.btn.ghost {
  background: transparent;
  color: var(--text-dim);
  border: none;
  text-decoration: underline;
  padding: 6px 4px;
}

.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.row.between { justify-content: space-between; }
.row.end { justify-content: flex-end; }

.progressbar {
  height: 8px;
  background: var(--panel-2);
  border-radius: 999px;
  overflow: hidden;
  border: 1px solid var(--border);
}
.progressbar > div { height: 100%; background: var(--accent-2); }

/* Assessment */
.q-option {
  display: block;
  width: 100%;
  text-align: left;
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 12px 16px;
  border-radius: 10px;
  margin-bottom: 8px;
  cursor: pointer;
  font-size: 0.95rem;
}
.q-option:hover { border-color: var(--accent-2); }
.q-option.correct { border-color: var(--good); background: rgba(76,175,109,0.12); }
.q-option.incorrect { border-color: var(--bad); background: rgba(224,96,90,0.12); }
.q-option:disabled { cursor: default; }

.speak-btn {
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--accent-2);
  border-radius: 999px;
  width: 42px;
  height: 42px;
  font-size: 1.1rem;
  cursor: pointer;
  flex-shrink: 0;
}
.speak-btn:hover { border-color: var(--accent-2); }

/* Conversation */
.chat-log {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 16px;
  min-height: 120px;
}
.bubble {
  max-width: 85%;
  padding: 12px 16px;
  border-radius: 14px;
  font-size: 1rem;
  line-height: 1.4;
}
.bubble.npc {
  background: var(--panel-2);
  border: 1px solid var(--border);
  align-self: flex-start;
}
.bubble.user {
  background: rgba(46,163,163,0.18);
  border: 1px solid var(--accent-2);
  align-self: flex-end;
}
.bubble.system {
  background: transparent;
  border: 1px dashed var(--border);
  color: var(--text-dim);
  align-self: center;
  font-size: 0.85rem;
}
.bubble .translation {
  color: var(--text-dim);
  font-size: 0.85rem;
  margin-top: 4px;
  font-style: italic;
}

.mic-btn {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  border: none;
  background: var(--accent);
  color: #201800;
  font-size: 1.8rem;
  cursor: pointer;
  box-shadow: 0 0 0 0 rgba(244,180,26,0.5);
}
.mic-btn.listening {
  background: var(--bad);
  color: #fff;
  animation: pulse 1.2s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(224,96,90,0.5); }
  70% { box-shadow: 0 0 0 18px rgba(224,96,90,0); }
  100% { box-shadow: 0 0 0 0 rgba(224,96,90,0); }
}

.text-fallback {
  display: flex;
  gap: 8px;
  margin-top: 14px;
}
.text-fallback input {
  flex: 1;
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 14px;
  border-radius: 10px;
  font-size: 0.95rem;
}

.scenario-card {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
}

/* Reading */
.flashcard {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px;
  text-align: center;
  cursor: pointer;
  min-height: 140px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
}
.flashcard .de { font-size: 1.6rem; font-weight: 700; }
.flashcard .en { color: var(--text-dim); font-size: 1.1rem; }
.flashcard .hint { color: var(--text-dim); font-size: 0.8rem; }

.word-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
@media (max-width: 560px) {
  .word-list { grid-template-columns: 1fr; }
}
.word-row {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
}
.word-row .de { font-weight: 700; }
.word-row .en {
  color: var(--text-dim);
  margin-left: auto;
  filter: blur(4px);
  transition: filter 0.15s ease;
  cursor: pointer;
}
.word-row .en.revealed { filter: none; }
.word-row .status {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--border);
  flex-shrink: 0;
}
.word-row .status.known { background: var(--good); }
.word-row .status.learning { background: var(--accent); }

/* Pronunciation gate on the lesson teach screen */
.word-row.done-row { border-color: var(--good); background: rgba(76,175,109,0.08); }
.gate-status { font-size: 1.1rem; width: 22px; text-align: center; flex-shrink: 0; }
.speak-btn.listening { animation: pulse 1.2s infinite; border-color: var(--bad); color: var(--bad); }

.tabs { display: flex; gap: 8px; margin-bottom: 16px; flex-wrap: wrap; }
.tab {
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text-dim);
  padding: 8px 14px;
  border-radius: 999px;
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
}
.tab.active { background: var(--accent-2); color: #06201f; border-color: var(--accent-2); }

.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--panel-2);
  border: 1px solid var(--border);
  padding: 10px 20px;
  border-radius: 999px;
  font-size: 0.9rem;
  z-index: 50;
}

.back-link {
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 0.9rem;
  margin-bottom: 10px;
  padding: 0;
  text-decoration: underline;
}

/* Lessons */
.lesson-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 10px; }
.lesson-node {
  display: flex; flex-direction: column; gap: 6px; align-items: flex-start; text-align: left;
  background: var(--panel-2); border: 1px solid var(--border); border-radius: 12px; padding: 14px;
  color: var(--text); cursor: pointer; font-size: 0.95rem; font-weight: 600;
}
.lesson-node:hover { border-color: var(--accent-2); }
.lesson-node.done { border-color: rgba(76,175,109,0.5); }
.lesson-node.next { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent); }
.lesson-meta { font-size: 0.8rem; }
.stars { color: var(--accent); letter-spacing: 2px; }
.badge { background: var(--accent); color: #201800; border-radius: 999px; padding: 2px 10px; font-size: 0.72rem; font-weight: 800; }

.lesson-top { display: flex; align-items: center; gap: 14px; margin-bottom: 16px; }
.lesson-card { min-height: 260px; }
.q-option.selected { border-color: var(--accent-2); background: rgba(46,163,163,0.15); }

.tile-line {
  min-height: 56px; display: flex; flex-wrap: wrap; gap: 8px; padding: 8px 0;
  border-bottom: 2px solid var(--border); margin-bottom: 16px;
}
.tile-line.ok { border-color: var(--good); }
.tile-line.bad { border-color: var(--bad); }
.tile-bank { display: flex; flex-wrap: wrap; gap: 8px; }
.tile {
  background: var(--panel-2); border: 1px solid var(--border); color: var(--text);
  border-radius: 10px; padding: 10px 14px; font-size: 1rem; cursor: pointer;
}
.tile:hover { border-color: var(--accent-2); }

.match-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.match-grid .q-option { margin-bottom: 8px; }

.feedback {
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
  margin-top: 14px; padding: 14px 18px; border-radius: 12px; border: 1px solid var(--border);
  background: var(--panel-2);
}
.feedback.good { background: rgba(76,175,109,0.15); border-color: var(--good); }
.feedback.bad { background: rgba(224,96,90,0.15); border-color: var(--bad); }

/* Practiced words highlighted in tutor replies */
mark.hl { background: none; color: inherit; border-bottom: 2px solid var(--accent); }

.emoji-option { font-size: 2rem; text-align: center; padding: 18px 10px; }