:root {
  --bg: #0f1216;
  --panel: #171c23;
  --panel-2: #1f262f;
  --border: #2a323c;
  --text: #e8edf2;
  --text-dim: #94a2b3;
  --accent: #f5a623;
  --accent-2: #ffd27f;
  --good: #3ecf8e;
  --bad: #ef6461;
  --radius: 14px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Inter", system-ui, sans-serif;
  background: radial-gradient(1200px 600px at 70% -10%, #1b2530 0%, var(--bg) 60%);
  color: var(--text);
  min-height: 100vh;
}

h1, h2, h3, .brand { font-family: "Outfit", sans-serif; }

/* ── Top bar ───────────────────────────────────────────── */
.topbar {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 16px 28px;
  border-bottom: 1px solid var(--border);
  background: rgba(15, 18, 22, 0.7);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 10;
}
.brand { font-weight: 700; font-size: 20px; color: var(--accent-2); }
.tabs { display: flex; gap: 6px; margin-left: auto; }
.tab {
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 15px;
  font-weight: 500;
  padding: 8px 14px;
  border-radius: 10px;
  cursor: pointer;
}
.tab:hover { color: var(--text); background: var(--panel-2); }
.tab.active { color: var(--bg); background: var(--accent); }
.badge {
  display: inline-block;
  min-width: 20px;
  text-align: center;
  background: var(--bad);
  color: #fff;
  border-radius: 999px;
  font-size: 12px;
  padding: 1px 6px;
  margin-left: 4px;
}
.ghost {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-dim);
  border-radius: 10px;
  padding: 7px 12px;
  cursor: pointer;
}
.ghost:hover { color: var(--text); border-color: var(--text-dim); }

/* ── Layout ────────────────────────────────────────────── */
.content { max-width: 860px; margin: 0 auto; padding: 32px 20px 80px; }
.view { display: none; }
.view.active { display: block; }
.hidden { display: none !important; }

/* ── Ask ───────────────────────────────────────────────── */
.ask-hero h1 { font-size: 34px; margin: 8px 0 6px; }
.subtitle { color: var(--text-dim); margin: 0 0 22px; line-height: 1.5; }
#ask-form { display: flex; flex-direction: column; gap: 12px; }
textarea {
  width: 100%;
  resize: vertical;
  background: var(--panel);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: var(--radius);
  padding: 14px 16px;
  font-size: 16px;
  font-family: inherit;
}
textarea:focus { outline: none; border-color: var(--accent); }
button[type="submit"], .primary {
  align-self: flex-start;
  background: var(--accent);
  color: #1a1206;
  font-weight: 600;
  font-size: 15px;
  border: none;
  border-radius: 10px;
  padding: 11px 20px;
  cursor: pointer;
}
button[type="submit"]:disabled { opacity: 0.5; cursor: default; }

/* ── Panels ────────────────────────────────────────────── */
.answer-panel, .card, .review-stage, .history-item {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 24px;
  margin-top: 22px;
  line-height: 1.6;
}
.answer-panel h1, .answer-panel h2, .answer-panel h3 { margin-top: 1em; }
.answer-panel pre {
  background: var(--bg);
  padding: 14px;
  border-radius: 10px;
  overflow-x: auto;
  border: 1px solid var(--border);
}
.answer-panel code { font-family: ui-monospace, monospace; font-size: 13.5px; }
.answer-panel :not(pre) > code { background: var(--panel-2); padding: 1px 6px; border-radius: 6px; }

.schedule-note {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
  color: var(--text-dim);
  font-size: 14px;
}

.flashcards-preview { margin-top: 18px; }
.flashcards-preview h3 { font-size: 15px; color: var(--accent-2); margin: 0 0 10px; }
.fc-pill {
  display: block;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 14px;
  margin-bottom: 8px;
  font-size: 14px;
}

.loading { color: var(--text-dim); }
.spinner {
  display: inline-block; width: 14px; height: 14px;
  border: 2px solid var(--border); border-top-color: var(--accent);
  border-radius: 50%; animation: spin 0.7s linear infinite; vertical-align: -2px;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Review ────────────────────────────────────────────── */
.empty { text-align: center; color: var(--text-dim); padding: 60px 20px; font-size: 17px; }
.review-progress { color: var(--text-dim); font-size: 14px; margin-bottom: 8px; }
.review-question { font-size: 20px; font-family: "Outfit"; margin: 6px 0 18px; }
.review-answer {
  background: var(--panel-2); border: 1px solid var(--border);
  border-radius: 10px; padding: 14px 16px; margin: 14px 0; line-height: 1.6;
}
.review-actions { display: flex; gap: 10px; margin-top: 18px; flex-wrap: wrap; }
.btn-reveal { background: var(--panel-2); color: var(--text); border: 1px solid var(--border); }
.btn-pass { background: var(--good); color: #062019; }
.btn-miss { background: var(--bad); color: #2a0c0c; }
.review-actions button { border: none; border-radius: 10px; padding: 11px 20px; font-weight: 600; cursor: pointer; font-size: 15px; }
.item-context { color: var(--text-dim); font-size: 14px; margin-bottom: 6px; }

/* ── History ───────────────────────────────────────────── */
.history-item { cursor: pointer; margin-top: 14px; transition: border-color .15s; }
.history-item:hover { border-color: var(--text-dim); }
.history-q { font-weight: 600; font-size: 16px; }
.history-meta { color: var(--text-dim); font-size: 13px; margin-top: 6px; display: flex; gap: 14px; flex-wrap: wrap; }
.tag { background: var(--panel-2); border-radius: 999px; padding: 2px 10px; font-size: 12px; }
.tag.mastered { color: var(--good); }
.tag.learning { color: var(--accent-2); }