:root {
  --bg: #faf8f4;
  --panel: #ffffff;
  --ink: #1f1b16;
  --muted: #6b6258;
  --border: #e4ddd2;
  --accent: #8a5a3b;
  --accent-ink: #ffffff;
  --correct: #3f7a4f;
  --error: #a5432e;
  --flagged: #b8863b;
  --radius: 12px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17140f;
    --panel: #221d17;
    --ink: #f2ede4;
    --muted: #b3a897;
    --border: #3a3226;
    --accent: #d0a273;
    --accent-ink: #1f1b16;
    --correct: #7fbf8f;
    --error: #e08a73;
    --flagged: #e0b063;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
  min-height: 100vh;
}

.arabic {
  font-family: "Scheherazade New", "Amiri", "Traditional Arabic", serif;
  direction: rtl;
  font-size: 1.9rem;
  line-height: 1.7;
}

a { color: var(--accent); }

button {
  font: inherit;
  cursor: pointer;
  border: none;
  border-radius: 8px;
  padding: 0.6rem 1.1rem;
  background: var(--accent);
  color: var(--accent-ink);
}
button.secondary {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--ink);
}
button:disabled { opacity: 0.55; cursor: default; }

input[type="text"], input[type="email"], input[type="password"] {
  font: inherit;
  padding: 0.6rem 0.75rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--ink);
  width: 100%;
}

/* Auth page */
.auth-shell {
  max-width: 420px;
  margin: 8vh auto;
  padding: 0 1rem;
}
.auth-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
}
.auth-card h1 {
  margin-top: 0;
  font-size: 1.3rem;
}
.auth-tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}
.auth-tabs button {
  flex: 1;
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
}
.auth-tabs button.active {
  background: var(--accent);
  color: var(--accent-ink);
  border-color: var(--accent);
}
.field { margin-bottom: 0.9rem; }
.field label {
  display: block;
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 0.3rem;
}
.form-error {
  color: var(--error);
  font-size: 0.9rem;
  min-height: 1.2em;
  margin-bottom: 0.5rem;
}
.form-note {
  color: var(--muted);
  font-size: 0.85rem;
  margin-top: 1rem;
}
.hidden { display: none !important; }

/* Lesson page */
.lesson-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 0;
  min-height: 100vh;
}
@media (max-width: 800px) {
  .lesson-shell { grid-template-columns: 1fr; }
  .sidebar { order: -1; border-left: none; border-bottom: 1px solid var(--border); }
}

.chat-column {
  display: flex;
  flex-direction: column;
  height: 100vh;
}
@media (max-width: 800px) {
  .chat-column { height: auto; }
}

.chat-header {
  padding: 0.9rem 1.25rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.chat-header h1 { font-size: 1.05rem; margin: 0; }
.chat-header .category { color: var(--muted); font-size: 0.85rem; }

.transcript {
  flex: 1;
  overflow-y: auto;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.turn {
  max-width: 640px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.9rem 1.1rem;
}
.turn.tutor { align-self: flex-start; }
.turn.learner {
  align-self: flex-end;
  background: var(--accent);
  color: var(--accent-ink);
  border-color: var(--accent);
}
.turn.learner .arabic { color: var(--accent-ink); }
.turn .translit { color: var(--muted); font-size: 0.9rem; margin-top: 0.35rem; }
.turn.learner .translit { color: var(--accent-ink); opacity: 0.85; }
.turn .english { font-size: 0.95rem; margin-top: 0.15rem; }
.turn .note {
  margin-top: 0.5rem;
  font-size: 0.85rem;
  color: var(--muted);
  border-top: 1px dashed var(--border);
  padding-top: 0.5rem;
}
.turn.verdict-correct { border-color: var(--correct); }
.turn.verdict-incorrect { border-color: var(--error); }
.turn .verdict-label { font-weight: 600; font-size: 0.85rem; }
.turn.verdict-correct .verdict-label { color: var(--correct); }
.turn.verdict-incorrect .verdict-label { color: var(--error); }

.prompt-line { font-size: 0.95rem; margin-bottom: 0.2rem; }

.composer {
  border-top: 1px solid var(--border);
  padding: 1rem 1.25rem;
  display: flex;
  gap: 0.6rem;
  align-items: flex-start;
}
.composer input { flex: 1; direction: rtl; font-size: 1.1rem; }
.your-turn {
  font-size: 0.8rem;
  color: var(--muted);
  padding: 0 1.25rem;
}

.sidebar {
  border-left: 1px solid var(--border);
  padding: 1.25rem;
  overflow-y: auto;
}
.sidebar h2 { font-size: 0.95rem; margin: 0 0 0.75rem; }
.sidebar .stat-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.9rem;
  margin-bottom: 0.4rem;
  color: var(--muted);
}
.sidebar .stat-row strong { color: var(--ink); }

.progress-bar-track {
  height: 10px;
  border-radius: 6px;
  background: var(--border);
  overflow: hidden;
  margin: 0.75rem 0 1.25rem;
}
.progress-bar-fill {
  height: 100%;
  background: var(--accent);
  transition: width 0.3s ease;
}

.flagged-list { list-style: none; padding: 0; margin: 0; }
.flagged-list li {
  font-size: 0.85rem;
  padding: 0.4rem 0;
  border-bottom: 1px solid var(--border);
}
.flagged-list .arabic { font-size: 1.1rem; }

.completion-screen {
  max-width: 560px;
  margin: 10vh auto;
  text-align: center;
  padding: 0 1rem;
}
.completion-screen .badge {
  font-size: 3rem;
}