/* ============================================================
   TrainerBjörn — Practical Lesson layer
   Turns a blog article into an interactive, clickable lesson that
   still lives on the notebook paper. Loaded on every post page;
   only does anything when build-posts.js has emitted .is-lesson
   widgets (so plain articles are unaffected).

   Brand: notebook paper (#FCF8F6), Kalam/Caveat hands, Training Teal
   (#0ea5a4), warm yellow/pink/orange accents. Playful, hand-drawn,
   sticky-note feel — fun and clickable, never corporate.
   ============================================================ */

:root {
  --lesson-teal:   var(--brand-turquoise, #0ea5a4);
  --lesson-yellow: var(--brand-yellow, #e8b830);
  --lesson-pink:   var(--brand-pink, #c65dad);
  --lesson-orange: var(--brand-orange, #e76844);
  --lesson-ink:    #2b2b2b;
  --lesson-line:   rgba(0, 0, 0, 0.16);
  --lesson-paper:  #fffdfb;
}

/* ── Lesson header: level/duration chips + progress bar ───────────── */
.lesson-meta { display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 0.4rem 0 1.1rem; }
.lesson-chip {
  font-family: 'Kalam', cursive; font-size: 0.95rem; line-height: 1;
  padding: 0.45rem 0.85rem; border-radius: 22px;
  border: 1.5px solid var(--lesson-line); color: var(--lesson-ink);
  background: #fff; display: inline-flex; align-items: center; gap: 0.4em;
  transform: rotate(-0.6deg);
}
.lesson-chip.lesson-level    { border-color: var(--lesson-teal);   color: var(--lesson-teal); }
.lesson-chip.lesson-duration { border-color: var(--lesson-orange); color: var(--lesson-orange); transform: rotate(0.7deg); }

.lesson-progress {
  position: relative; height: 14px; border-radius: 10px;
  background: rgba(0, 0, 0, 0.06); border: 1.5px solid var(--lesson-line);
  overflow: hidden; margin: 0 0 0.4rem;
}
.lesson-progress-bar {
  position: absolute; inset: 0 auto 0 0; width: 0%;
  background: repeating-linear-gradient(45deg, var(--lesson-teal) 0 10px, #13bdbb 10px 20px);
  transition: width 0.45s cubic-bezier(.4, 1.3, .5, 1);
}
.lesson-progress-label {
  font-family: 'Kalam', cursive; font-size: 0.82rem; color: var(--lesson-ink);
  opacity: 0.7; display: block; text-align: right; margin-bottom: 1.4rem;
}

/* ── Shared card frame (objectives / recap) ───────────────────────── */
.lesson-card {
  position: relative; background: var(--lesson-paper);
  border: 1.5px solid var(--lesson-line); border-radius: 14px;
  padding: 1.1rem 1.3rem 1.2rem; margin: 1.6rem 0;
  box-shadow: 2px 3px 0 rgba(0, 0, 0, 0.05);
}
.lesson-card-title {
  font-family: 'Caveat', 'Kalam', cursive; font-weight: 700;
  font-size: 1.6rem; color: var(--lesson-teal); margin: 0 0 0.6rem;
}

/* ── Objectives: clickable goal checklist (sticky-note) ───────────── */
.lesson-objectives { background: #fffceb; border-color: rgba(232, 184, 48, 0.5); transform: rotate(-0.4deg); }
.lesson-objectives .lesson-card-title { color: #b4870c; }
.lesson-goals { list-style: none; margin: 0; padding: 0; }
.lesson-goals li { margin: 0.35rem 0; }
.lesson-goals label {
  display: flex; align-items: flex-start; gap: 0.6em; cursor: pointer;
  font-family: 'Kalam', cursive; font-size: 1.05rem; line-height: 1.4; color: var(--lesson-ink);
}
.lesson-goal-check { appearance: none; -webkit-appearance: none; flex: 0 0 auto;
  width: 22px; height: 22px; margin-top: 1px; border: 2px solid var(--lesson-teal);
  border-radius: 6px; background: #fff; cursor: pointer; position: relative; transition: background 0.15s; }
.lesson-goal-check:checked { background: var(--lesson-teal); }
.lesson-goal-check:checked::after { content: "✓"; position: absolute; inset: -2px 0 0 3px; color: #fff; font-weight: 700; }
.lesson-goal-check:checked + span { text-decoration: line-through; opacity: 0.55; }

/* ── Steps: numbered cards with a "done" toggle ───────────────────── */
.lesson-step {
  position: relative; border: 1.5px solid var(--lesson-line); border-radius: 14px;
  padding: 1.1rem 1.3rem 1.2rem 1.3rem; margin: 1.5rem 0;
  background: #fff; box-shadow: 2px 3px 0 rgba(0, 0, 0, 0.05);
  transition: border-color 0.25s, box-shadow 0.25s, opacity 0.25s;
}
.lesson-step.is-done { border-color: var(--lesson-teal); box-shadow: 2px 3px 0 rgba(14, 165, 164, 0.18); }
.lesson-step-head { display: flex; align-items: center; gap: 0.7rem; margin-bottom: 0.5rem; flex-wrap: wrap; }
.lesson-step-num {
  flex: 0 0 auto; width: 38px; height: 38px; border-radius: 50%;
  background: var(--lesson-teal); color: #fff;
  font-family: 'Caveat', cursive; font-weight: 700; font-size: 1.5rem;
  display: flex; align-items: center; justify-content: center;
  transform: rotate(-4deg); box-shadow: 1px 2px 0 rgba(0, 0, 0, 0.12);
}
.lesson-step.is-done .lesson-step-num { background: var(--lesson-pink); }
.lesson-step-title { font-family: 'Caveat', 'Kalam', cursive; font-weight: 700; font-size: 1.55rem; color: var(--lesson-ink); margin: 0; flex: 1 1 auto; }
.lesson-step-done {
  font-family: 'Kalam', cursive; font-size: 0.92rem; color: var(--lesson-teal);
  display: inline-flex; align-items: center; gap: 0.4em; cursor: pointer; user-select: none;
  border: 1.5px solid var(--lesson-teal); border-radius: 20px; padding: 0.25rem 0.7rem; white-space: nowrap;
}
.lesson-step.is-done .lesson-step-done { background: var(--lesson-teal); color: #fff; }
.lesson-step-check { accent-color: #fff; cursor: pointer; }
.lesson-step-body > :first-child { margin-top: 0; }

/* ── Try-it: practical "do this yourself" callout ─────────────────── */
.lesson-tryit {
  display: flex; gap: 0.9rem; align-items: flex-start;
  background: rgba(14, 165, 164, 0.08); border-left: 6px solid var(--lesson-teal);
  border-radius: 10px; padding: 1rem 1.2rem; margin: 1.5rem 0;
}
.lesson-tryit-mark, .lesson-takeaway-mark {
  flex: 0 0 auto; width: 34px; height: 34px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem; color: #fff; transform: rotate(-5deg);
}
.lesson-tryit-mark { background: var(--lesson-teal); }
.lesson-tryit-label { font-family: 'Caveat', cursive; font-weight: 700; font-size: 1.3rem; color: var(--lesson-teal); display: block; margin-bottom: 0.1rem; }
.lesson-tryit-body > :first-child { margin-top: 0; }

/* ── Takeaway: highlighted sticky note ────────────────────────────── */
.lesson-takeaway {
  display: flex; gap: 0.9rem; align-items: flex-start;
  background: #fff6fb; border: 1.5px dashed var(--lesson-pink);
  border-radius: 12px; padding: 1rem 1.2rem; margin: 1.6rem 0; transform: rotate(0.4deg);
}
.lesson-takeaway-mark { background: var(--lesson-pink); }
.lesson-takeaway-label { font-family: 'Caveat', cursive; font-weight: 700; font-size: 1.3rem; color: var(--lesson-pink); display: block; margin-bottom: 0.1rem; }
.lesson-takeaway-body > :first-child { margin-top: 0; }

/* ── Quiz: click-to-check multiple choice ─────────────────────────── */
.lesson-quiz {
  border: 1.5px solid var(--lesson-line); border-radius: 14px;
  padding: 1.1rem 1.3rem 1.2rem; margin: 1.6rem 0; background: #fff;
  box-shadow: 2px 3px 0 rgba(0, 0, 0, 0.05);
}
.lesson-quiz-kicker { font-family: 'Caveat', cursive; font-weight: 700; font-size: 1.3rem; color: var(--lesson-orange); }
.lesson-quiz-q { font-family: 'Kalam', cursive; font-weight: 700; font-size: 1.15rem; color: var(--lesson-ink); margin: 0.2rem 0 0.9rem; }
.lesson-quiz-opts { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 0.55rem; }
.lesson-opt {
  font-family: 'Kalam', cursive; font-size: 1.02rem; text-align: left; width: 100%;
  border: 1.5px solid var(--lesson-line); border-radius: 12px; padding: 0.7rem 0.95rem;
  background: #fff; color: var(--lesson-ink); cursor: pointer;
  transition: border-color 0.15s, background 0.15s, transform 0.1s;
  display: flex; align-items: center; gap: 0.6em;
}
.lesson-opt::before { content: ""; flex: 0 0 auto; width: 18px; height: 18px; border-radius: 50%; border: 2px solid var(--lesson-line); }
.lesson-opt:hover:not(:disabled) { border-color: var(--lesson-teal); transform: translateX(2px); }
.lesson-opt.is-correct { border-color: var(--lesson-teal); background: rgba(14, 165, 164, 0.12); }
.lesson-opt.is-correct::before { content: "✓"; border-color: var(--lesson-teal); background: var(--lesson-teal); color: #fff; display: flex; align-items: center; justify-content: center; font-size: 12px; }
.lesson-opt.is-wrong { border-color: var(--lesson-orange); background: rgba(231, 104, 68, 0.1); }
.lesson-opt.is-wrong::before { content: "✕"; border-color: var(--lesson-orange); background: var(--lesson-orange); color: #fff; display: flex; align-items: center; justify-content: center; font-size: 12px; }
.lesson-opt:disabled { cursor: default; }
.lesson-quiz-explain {
  margin-top: 0.9rem; padding: 0.8rem 1rem; border-radius: 10px;
  background: rgba(232, 184, 48, 0.14); border-left: 5px solid var(--lesson-yellow);
  font-family: 'Kalam', cursive; line-height: 1.5; color: var(--lesson-ink);
}
.lesson-quiz-explain[hidden] { display: none; }

/* ── Code copy button (added by lesson.js) ────────────────────────── */
.lesson-pre-wrap { position: relative; }
.lesson-copy {
  position: absolute; top: 8px; right: 8px;
  font-family: 'Kalam', cursive; font-size: 0.8rem; cursor: pointer;
  border: 1.5px solid var(--lesson-line); border-radius: 16px;
  background: #fff; color: var(--lesson-ink); padding: 0.2rem 0.7rem; opacity: 0.85;
}
.lesson-copy:hover { border-color: var(--lesson-teal); color: var(--lesson-teal); opacity: 1; }
.lesson-copy.copied { border-color: var(--lesson-teal); background: var(--lesson-teal); color: #fff; }

/* ── Completion banner (built by lesson.js) ───────────────────────── */
.lesson-done-banner {
  margin: 2rem 0 0.5rem; padding: 1.2rem 1.4rem; border-radius: 16px;
  background: rgba(14, 165, 164, 0.1); border: 2px dashed var(--lesson-teal);
  font-family: 'Caveat', cursive; text-align: center; transform: rotate(-0.5deg);
}
.lesson-done-banner strong { font-size: 1.7rem; color: var(--lesson-teal); display: block; }
.lesson-done-banner span { font-family: 'Kalam', cursive; }
.lesson-done-banner[hidden] { display: none; }

@media (max-width: 620px) {
  .lesson-step-title, .lesson-step-num { font-size: 1.3rem; }
  .lesson-step-head { gap: 0.5rem; }
}