:root {
  --bg: #0f1419;
  --panel: #1a2028;
  --text: #e6edf3;
  --muted: #8b949e;
  --accent: #3fb950;
  --persian: #d2a8ff;
  --border: #30363d;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; height: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Inter", sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}

.chat {
  max-width: 780px;
  margin: 0 auto;
  height: 100vh;
  display: flex;
  flex-direction: column;
  padding: 1rem;
}

header { padding-bottom: 1rem; border-bottom: 1px solid var(--border); }
header h1 { margin: 0; font-size: 1.25rem; font-weight: 600; }
.header-row { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.clear-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  border-radius: 6px;
  padding: 0.25rem 0.6rem;
  font-size: 0.75rem;
  cursor: pointer;
}
.clear-btn:hover { color: var(--text); border-color: var(--muted); }
.hint { color: var(--muted); font-size: 0.8rem; }

.messages {
  flex: 1;
  overflow-y: auto;
  padding: 1rem 0;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.msg { display: flex; flex-direction: column; gap: 0.25rem; }
.msg.user { align-items: flex-end; }
.msg.user .bubble { background: var(--panel); color: var(--text); border-radius: 12px 12px 2px 12px; padding: 0.5rem 0.75rem; max-width: 80%; }

.msg.tutor .bubble {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px 12px 12px 2px;
  padding: 0.75rem 1rem;
  max-width: 90%;
}

.persian-line {
  font-size: 1.5rem;
  color: var(--persian);
  direction: rtl;
  text-align: right;
  font-family: "Vazirmatn", "Noto Naskh Arabic", "Tahoma", serif;
  margin: 0.25rem 0;
  cursor: pointer;
}
.persian-line:hover { text-decoration: underline; }

.translit { color: var(--muted); font-style: italic; margin: 0.25rem 0; }
.english { color: var(--text); margin: 0.5rem 0 0.25rem; }
.notes { color: var(--muted); font-size: 0.85rem; margin-top: 0.5rem; padding-top: 0.5rem; border-top: 1px dashed var(--border); }

.audio-btn {
  background: transparent;
  border: 1px solid var(--accent);
  color: var(--accent);
  border-radius: 6px;
  padding: 0.25rem 0.75rem;
  font-size: 0.8rem;
  cursor: pointer;
  margin-top: 0.5rem;
}
.audio-btn:hover { background: rgba(63, 185, 80, 0.1); }

.composer {
  display: flex;
  gap: 0.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}
.composer input {
  flex: 1;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  padding: 0.75rem 1rem;
  font-size: 1rem;
}
.composer button {
  background: var(--accent);
  border: none;
  color: var(--bg);
  border-radius: 8px;
  padding: 0.75rem 1.25rem;
  font-weight: 600;
  cursor: pointer;
}
.composer button:disabled { opacity: 0.5; cursor: not-allowed; }

/* Markdown rendering inside tutor bubbles */
.markdown-body { color: var(--text); font-size: 0.95rem; line-height: 1.5; }
.markdown-body h1, .markdown-body h2, .markdown-body h3 { margin: 0.5rem 0 0.25rem; color: var(--text); }
.markdown-body p { margin: 0.4rem 0; }
.markdown-body ul, .markdown-body ol { margin: 0.4rem 0; padding-left: 1.25rem; }
.markdown-body li { margin: 0.15rem 0; }
.markdown-body code {
  background: rgba(63, 185, 80, 0.1);
  color: var(--persian);
  padding: 0 0.25rem;
  border-radius: 4px;
  font-size: 0.85em;
  font-family: "Vazirmatn", "SF Mono", Consolas, monospace;
}
.markdown-body strong { color: var(--text); }
.markdown-body em { color: var(--muted); }
.markdown-body table {
  border-collapse: collapse;
  width: 100%;
  margin: 0.5rem 0;
  font-size: 0.9rem;
}
.markdown-body th, .markdown-body td {
  border: 1px solid var(--border);
  padding: 0.35rem 0.5rem;
  text-align: left;
}
.markdown-body th { background: rgba(63, 185, 80, 0.08); color: var(--text); font-weight: 600; }
.markdown-body tr:nth-child(even) td { background: rgba(255,255,255,0.02); }
/* Persian text inside tables — right-align Persian chars */
.markdown-body td:first-child { font-family: "Vazirmatn", "Noto Naskh Arabic", "Tahoma", serif; }

/* ---- nav (Chat / Lessons) ---- */
.header-actions { display: flex; align-items: center; gap: 0.75rem; }
.nav { display: flex; gap: 0.25rem; }
.nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.85rem;
  padding: 0.25rem 0.6rem;
  border-radius: 6px;
  border: 1px solid transparent;
}
.nav a:hover { color: var(--text); }
.nav a.active { color: var(--accent); border-color: var(--border); }

/* ---- lessons: scrollable body so the page behaves like the chat column ---- */
.library, .lesson { flex: 1; overflow-y: auto; padding: 1rem 0; }
.hidden { display: none; }

/* library grid of lesson cards */
.library {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 0.75rem;
  align-content: start;
}
.card {
  display: block;
  text-decoration: none;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.85rem 1rem;
  color: var(--text);
  transition: border-color 0.12s;
}
.card:hover { border-color: var(--accent); }
.card.pending { opacity: 0.5; pointer-events: none; }
.card-level {
  display: inline-block;
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.05rem 0.5rem;
  margin-bottom: 0.4rem;
}
.card-title { font-weight: 600; font-size: 1rem; margin-bottom: 0.25rem; }
.card-summary { color: var(--muted); font-size: 0.82rem; line-height: 1.35; }
.card-meta { color: var(--accent); font-size: 0.72rem; margin-top: 0.5rem; }

/* lesson detail */
.back { color: var(--muted); text-decoration: none; font-size: 0.85rem; }
.back:hover { color: var(--text); }
.lesson-title { margin: 0.5rem 0 0.25rem; font-size: 1.35rem; }
.lesson-summary { color: var(--muted); margin: 0 0 1rem; }
.section { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--muted); margin: 1.5rem 0 0.5rem; }

.phrase, .dline {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--border);
}
.phrase-body { flex: 1; }
.translit-big { font-size: 1.15rem; color: var(--text); font-weight: 500; }
.persian-small {
  font-size: 1rem;
  color: var(--persian);
  direction: rtl;
  text-align: right;
  font-family: "Vazirmatn", "Noto Naskh Arabic", "Tahoma", serif;
  opacity: 0.75;
  margin-top: 0.15rem;
}
.phrase .english, .dline .english { color: var(--muted); margin: 0.1rem 0; }
.phrase .note {
  color: var(--muted);
  font-size: 0.8rem;
  margin-top: 0.3rem;
  font-style: italic;
}
.play {
  flex: none;
  background: transparent;
  border: 1px solid var(--accent);
  color: var(--accent);
  border-radius: 50%;
  width: 2rem;
  height: 2rem;
  font-size: 0.7rem;
  cursor: pointer;
  line-height: 1;
}
.play:hover { background: rgba(63, 185, 80, 0.1); }
.play:disabled { opacity: 0.4; cursor: default; }

.dialogue { background: var(--panel); border-radius: 12px; padding: 0.5rem 1rem; }
.dline { border-bottom: 1px dashed var(--border); }
.dline:last-child { border-bottom: none; }
.dline.b { opacity: 0.92; }

.answers { display: flex; flex-direction: column; gap: 0.75rem; margin-top: 1rem; }
.loading { color: var(--muted); padding: 2rem 0; text-align: center; }