/* ===== English Lab ===== */
:root {
  --bg: #faf7f2;
  --card: #ffffff;
  --ink: #1f2333;
  --ink-soft: #5a6072;
  --accent: #5b5bd6;
  --accent-soft: #ecebfc;
  --green: #2f9e6e;
  --green-soft: #e2f5ec;
  --red: #d64545;
  --red-soft: #fbe9e9;
  --amber: #b98a1e;
  --amber-soft: #fdf3da;
  --border: #e7e2d8;
  --radius: 16px;
  --shadow: 0 2px 10px rgba(31, 35, 51, .06);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  font-size: 17px;
}

/* ---- Topbar ---- */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 24px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 10;
}
.logo { font-size: 22px; font-weight: 800; text-decoration: none; color: var(--ink); letter-spacing: -.5px; }
.logo span { color: var(--accent); }
.topbar nav { display: flex; align-items: center; gap: 18px; }
.topbar nav a { text-decoration: none; color: var(--ink-soft); font-weight: 600; }
.topbar nav a.active, .topbar nav a:hover { color: var(--accent); }
.badge {
  background: var(--red); color: #fff; border-radius: 999px;
  font-size: 12px; padding: 1px 8px; font-weight: 700; vertical-align: middle;
}
.teacher-toggle {
  display: flex; align-items: center; gap: 6px;
  font-size: 14px; font-weight: 600; color: var(--ink-soft);
  cursor: pointer; user-select: none;
  background: var(--accent-soft); padding: 6px 12px; border-radius: 999px;
}

/* ---- Layout ---- */
.container { max-width: 900px; margin: 0 auto; padding: 32px 20px 80px; }
.container.narrow { max-width: 640px; }
.footer { text-align: center; color: var(--ink-soft); font-size: 14px; padding: 24px; }
.loading { color: var(--ink-soft); text-align: center; padding: 40px; }

/* ---- Hub ---- */
.hero { text-align: center; margin: 24px 0 48px; }
.hero h1 { font-size: 34px; letter-spacing: -.5px; margin-bottom: 8px; }
.hero p { color: var(--ink-soft); max-width: 520px; margin: 0 auto; }

.category { --cat: var(--accent); margin-bottom: 48px; }
.category > h2 {
  display: flex; align-items: center; gap: 10px;
  font-size: 21px; color: var(--ink);
  padding-bottom: 10px; margin-bottom: 16px;
  position: relative;
}
.category > h2::after {
  content: ""; position: absolute; left: 0; bottom: 0;
  width: 42px; height: 3px; border-radius: 2px;
  background: var(--cat);
}
.cat-emoji { font-size: 22px; }
.theme-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; }

.theme-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px; box-shadow: var(--shadow);
  transition: box-shadow .15s ease, transform .15s ease;
}
.theme-card:not(.soon):hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(31, 35, 51, .1);
}
.theme-card h3 {
  font-size: 17px; margin-bottom: 12px; color: var(--ink);
  display: flex; align-items: center; gap: 8px;
}
.theme-card h3::before {
  content: ""; width: 7px; height: 7px; border-radius: 50%;
  background: var(--cat); flex-shrink: 0;
}
.theme-card.soon { opacity: .55; }
.soon-tag { font-size: 12px; font-weight: 700; color: var(--ink-soft); background: var(--bg); border: 1px solid var(--border); border-radius: 999px; padding: 2px 10px; }

.lesson-link {
  display: flex; align-items: center; gap: 12px;
  text-decoration: none; color: var(--ink);
  background: var(--bg);
  border: 1px solid transparent;
  border-radius: 12px; padding: 10px 12px; margin-top: 8px;
  font-weight: 600; transition: border-color .15s ease;
}
.lesson-link:hover { border-color: color-mix(in srgb, var(--cat) 55%, transparent); }
.lesson-link .thumb {
  width: 48px; height: 48px; flex-shrink: 0;
  object-fit: cover; object-position: top;
  border-radius: 10px;
  background: var(--border);
}
.lesson-link .ll-body { display: flex; flex-direction: column; min-width: 0; }
.lesson-link .ll-title { line-height: 1.3; }
.lesson-link .meta { display: block; font-size: 13px; font-weight: 500; color: var(--ink-soft); margin-top: 2px; }
.lesson-link .done-check { color: var(--green); font-weight: 800; margin-left: 6px; }

/* ---- Lesson page ---- */
.lesson-header { text-align: center; margin-bottom: 12px; }
.lesson-header .crumbs { font-size: 14px; color: var(--ink-soft); margin-bottom: 6px; }
.lesson-header h1 { font-size: 34px; letter-spacing: -.5px; }
.lesson-header .subtitle { color: var(--ink-soft); font-size: 19px; }
.lesson-meta { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin-top: 14px; }
.pill {
  background: var(--card); border: 1px solid var(--border); border-radius: 999px;
  padding: 4px 14px; font-size: 14px; font-weight: 600; color: var(--ink-soft);
}
.pill.accent { background: var(--accent-soft); color: var(--accent); border-color: transparent; }

.hero-img {
  width: 100%; max-height: 380px; object-fit: cover; object-position: top;
  border-radius: var(--radius); margin: 20px 0 6px; box-shadow: var(--shadow);
}
.img-caption { text-align: center; font-size: 13px; color: var(--ink-soft); margin-bottom: 20px; }

.block {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px; margin: 26px 0; box-shadow: var(--shadow);
}
.block-tag {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 800; text-transform: uppercase; letter-spacing: 1px;
  color: var(--accent); margin-bottom: 6px;
}
.block-tag .num {
  background: var(--accent); color: #fff; width: 24px; height: 24px; border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center; font-size: 13px;
}
.block h2 { font-size: 24px; margin-bottom: 4px; }
.block .block-time { font-size: 14px; color: var(--ink-soft); margin-bottom: 16px; }

.q-list { list-style: none; }
.q-list li {
  padding: 12px 16px; margin: 10px 0; background: var(--bg);
  border-left: 4px solid var(--accent); border-radius: 8px; font-size: 18px;
}

/* Vocabulary */
.vocab-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 12px; }
.vocab-card {
  background: var(--bg); border-radius: 12px; padding: 14px 16px; cursor: pointer;
  border: 1px solid var(--border); transition: border-color .15s;
}
.vocab-card:hover { border-color: var(--accent); }
.vocab-card .word { font-weight: 800; font-size: 18px; }
.vocab-card .type { font-size: 12px; color: var(--accent); font-weight: 700; margin-left: 6px; }
.vocab-card .pt { color: var(--ink-soft); font-weight: 600; }
.vocab-card .example { font-size: 14px; color: var(--ink-soft); font-style: italic; margin-top: 6px; display: none; }
.vocab-card.open .example { display: block; }
.vocab-hint { font-size: 14px; color: var(--ink-soft); margin-bottom: 12px; }

/* Reading */
.reading-text p { margin-bottom: 14px; font-size: 18px; }
.reading-text strong { color: var(--accent); }
.reading-img { width: 100%; border-radius: 12px; margin-bottom: 16px; max-height: 300px; object-fit: cover; object-position: top; }

/* Grammar */
.grammar-explain p { margin-bottom: 10px; }
.example-box {
  background: var(--accent-soft); border-radius: 10px; padding: 14px 18px; margin: 14px 0;
}
.example-box p { margin: 4px 0; font-size: 17px; }
.practice-item { margin: 12px 0; padding: 12px 16px; background: var(--bg); border-radius: 10px; }
.practice-item .prompt { font-weight: 600; }
.reveal-btn {
  background: none; border: none; color: var(--accent); font-weight: 700; cursor: pointer;
  font-size: 15px; padding: 4px 0; font-family: inherit;
}
.practice-item .answer { display: none; color: var(--green); font-weight: 600; }
.practice-item.open .answer { display: block; }

/* Quiz */
.quiz-q { margin: 20px 0; }
.quiz-q .q-text { font-weight: 700; font-size: 18px; margin-bottom: 10px; }
.quiz-opt {
  display: block; width: 100%; text-align: left; font-family: inherit; font-size: 16px;
  background: var(--bg); border: 2px solid var(--border); border-radius: 10px;
  padding: 10px 16px; margin: 8px 0; cursor: pointer; transition: border-color .15s;
}
.quiz-opt:hover { border-color: var(--accent); }
.quiz-opt.correct { border-color: var(--green); background: var(--green-soft); }
.quiz-opt.wrong { border-color: var(--red); background: var(--red-soft); }
.quiz-opt:disabled { cursor: default; }
.quiz-result {
  text-align: center; padding: 20px; border-radius: 12px; margin-top: 20px;
  background: var(--accent-soft); font-size: 20px; font-weight: 700; display: none;
}

.big-btn {
  display: inline-block; background: var(--accent); color: #fff; border: none; cursor: pointer;
  font-family: inherit; font-size: 17px; font-weight: 700; border-radius: 12px;
  padding: 14px 28px; margin-top: 16px; text-decoration: none; transition: opacity .15s;
}
.big-btn:hover { opacity: .9; }
.big-btn.secondary { background: var(--card); color: var(--accent); border: 2px solid var(--accent); }
.big-btn:disabled { opacity: .5; cursor: default; }

/* Teacher notes */
.teacher-note {
  display: none; background: var(--amber-soft); border-left: 4px solid var(--amber);
  border-radius: 8px; padding: 12px 16px; margin-top: 16px; font-size: 15px;
}
.teacher-note::before { content: "👩‍🏫 Nota da professora: "; font-weight: 700; }
body.teacher .teacher-note { display: block; }

/* ---- Review (flashcards) ---- */
.review-head { text-align: center; margin-bottom: 24px; }
.review-head h1 { font-size: 30px; }
.review-head p { color: var(--ink-soft); }

.flashcard {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 48px 28px; text-align: center; cursor: pointer;
  min-height: 220px; display: flex; flex-direction: column; justify-content: center;
}
.flashcard .fc-word { font-size: 32px; font-weight: 800; }
.flashcard .fc-answer { display: none; margin-top: 12px; }
.flashcard.flipped .fc-answer { display: block; }
.flashcard .fc-pt { font-size: 22px; color: var(--accent); font-weight: 700; }
.flashcard .fc-example { font-style: italic; color: var(--ink-soft); margin-top: 8px; }
.flashcard .fc-hint { font-size: 14px; color: var(--ink-soft); margin-top: 16px; }

.review-actions { display: flex; gap: 12px; justify-content: center; margin-top: 20px; }
.review-actions button {
  flex: 1; max-width: 200px; font-family: inherit; font-size: 17px; font-weight: 700;
  border-radius: 12px; padding: 14px; cursor: pointer; border: none;
}
.btn-wrong { background: var(--red-soft); color: var(--red); }
.btn-right { background: var(--green-soft); color: var(--green); }

.review-empty {
  text-align: center; background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 48px 24px;
}
.review-empty .emoji { font-size: 48px; }
.review-progress { text-align: center; color: var(--ink-soft); font-size: 14px; margin-bottom: 12px; }

@media (max-width: 600px) {
  .hero h1 { font-size: 26px; }
  .lesson-header h1 { font-size: 26px; }
  .block { padding: 20px 16px; }
  .topbar { flex-direction: column; gap: 10px; }
}