:root {
  --bg: #ffffff;
  --card: #ffffff;
  --card-2: #f7f7f7;
  --border: #dddddd;
  --text: #222222;
  --muted: #717171;
  --accent: #ff385c;
  --accent-soft: rgba(255, 56, 92, 0.14);
  --good: #6bbf7b;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, system-ui, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  max-width: 1120px;
  margin: 0 auto;
  padding: 28px 20px 12px;
}
.topbar h1 { font-size: 1.6rem; margin: 0; font-weight: 600; letter-spacing: -0.02em; }
.tagline { color: var(--muted); margin: 4px 0 0; font-size: 0.95rem; }
.back { color: #222222; text-decoration: none; font-size: 0.85rem; white-space: nowrap; opacity: 0.85; }
.back:hover { opacity: 1; }

.progress { max-width: 1120px; margin: 8px auto 0; padding: 0 20px; }
.progress-bar { height: 4px; background: var(--accent); border-radius: 999px; width: 0%; transition: width 0.35s ease; }

.stepper {
  display: flex;
  gap: 8px;
  max-width: 1120px;
  margin: 18px auto 0;
  padding: 0 20px;
  overflow-x: auto;
  scrollbar-width: none;
}
.stepper::-webkit-scrollbar { display: none; }
.step-pill {
  flex: 0 0 auto;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--muted);
  border-radius: 999px;
  padding: 7px 14px;
  font-size: 0.78rem;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.15s;
}
.step-pill:hover { color: var(--text); }
.step-pill.active { background: var(--accent); border-color: var(--accent); color: #ffffff; font-weight: 600; }
.step-pill.done { border-color: var(--accent); color: var(--text); }
.step-pill.done::before { content: "✓ "; color: var(--accent); }

.stage { max-width: 1120px; margin: 22px auto 60px; padding: 0 20px; }

.lesson-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 30px;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.1);
}
.eyebrow { color: var(--accent); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 14px; font-weight: 600; }
.lesson :first-child { margin-top: 0; }
.lesson p { margin: 0 0 14px; }
.lesson strong { color: #222222; }
.lesson em { color: var(--text); }

.example {
  margin-top: 22px;
  background: var(--card-2);
  border-left: 3px solid var(--accent);
  border-radius: 10px;
  padding: 14px 18px;
}
.example-label { font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--muted); margin-bottom: 6px; }
.example p { margin: 0; color: var(--text); font-size: 0.95rem; }

.practice {
  margin-top: 26px;
  border-top: 1px dashed var(--border);
  padding-top: 22px;
}
.practice-label { font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--accent); margin-bottom: 8px; font-weight: 600; }
.practice-prompt { margin: 0 0 12px; font-weight: 500; }
textarea {
  width: 100%;
  background: #f7f7f7;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 13px 15px;
  font: inherit;
  font-size: 0.95rem;
  resize: vertical;
}
textarea:focus { outline: none; border-color: var(--accent); }

.practice-actions { display: flex; align-items: center; gap: 12px; margin-top: 12px; }
.coach-note { color: var(--muted); font-size: 0.85rem; }

.coach {
  margin-top: 16px;
  background: var(--accent-soft);
  border: 1px solid rgba(255, 56, 92, 0.3);
  border-radius: 12px;
  padding: 16px 18px;
  white-space: pre-wrap;
  font-size: 0.95rem;
}
.coach .coach-head { font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--accent); margin-bottom: 8px; font-weight: 600; }

.btn { border: none; border-radius: 11px; padding: 12px 20px; font: inherit; font-weight: 600; font-size: 0.92rem; cursor: pointer; transition: filter 0.12s, opacity 0.12s; }
.btn.primary { background: var(--accent); color: #ffffff; }
.btn.primary:hover { filter: brightness(1.08); }
.btn.ghost { background: transparent; color: var(--text); border: 1px solid var(--border); }
.btn.ghost:hover { border-color: var(--accent); }
.btn:disabled { opacity: 0.5; cursor: default; }

.nav-row { display: flex; justify-content: space-between; margin-top: 22px; }

.done { text-align: center; background: var(--card); border: 1px solid var(--border); border-radius: 18px; padding: 40px 30px; margin-top: 10px; }
.done h2 { margin: 0 0 12px; }
.done p { color: var(--muted); max-width: 60ch; margin: 0 auto 12px; }
.done .done-cta { color: var(--text); }
.done .btn { margin-top: 16px; }

.hidden { display: none !important; }

@media (max-width: 560px) {
  .lesson-card { padding: 22px; }
  .topbar { flex-direction: column; }
}