:root {
  --cream: #FBF7F2;
  --cream-2: #F3EBDF;
  --ink: #2A2320;
  --ink-2: #4A3F38;
  --terracotta: #C85C3C;
  --terracotta-dark: #A84527;
  --forest: #2D4A3E;
  --gold: #D4A84B;
  --soft: #E8DECD;
  --ok: #4A7C5A;
  --err: #B84A4A;
  --locked: #B8AFA3;
  --fs-boost: 0px;
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body {
  margin: 0; padding: 0;
  background: var(--cream);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.55;
}
body {
  max-width: 480px;
  margin: 0 auto;
  min-height: 100vh;
  position: relative;
  padding-bottom: 40px;
}
a { color: inherit; text-decoration: none; }

.header {
  padding: 20px 20px 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky; top: 0;
  background: var(--cream);
  z-index: 10;
  border-bottom: 1px solid var(--soft);
}
.header-title {
  font-size: 15px;
  color: var(--ink-2);
  letter-spacing: 0.5px;
  text-transform: uppercase;
  font-weight: 600;
}
.brand {
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--ink);
  font-size: 20px;
}
.brand-dot { color: var(--terracotta); }

.back-btn {
  background: none; border: none;
  color: var(--terracotta);
  font-size: 16px; font-weight: 600;
  cursor: pointer;
  padding: 6px 10px 6px 0;
  display: flex; align-items: center; gap: 4px;
  font-family: inherit;
}

.font-ctrl {
  background: var(--cream-2);
  border: 1px solid var(--soft);
  border-radius: 8px;
  padding: 4px 10px;
  font-size: 13px;
  font-weight: 700;
  color: var(--ink-2);
  cursor: pointer;
  font-family: inherit;
  white-space: nowrap;
  flex-shrink: 0;
}
.font-ctrl:active { transform: scale(0.95); }

.progress-wrap { padding: 0 20px 14px; background: var(--cream); }
.progress-bar { height: 6px; background: var(--soft); border-radius: 3px; overflow: hidden; }
.progress-fill { height: 100%; background: var(--terracotta); transition: width 0.4s ease; }
.progress-text { font-size: 14px; color: var(--ink-2); margin-top: 6px; }

.screen { padding: 20px; animation: fadeIn 0.3s ease; }
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: none; }
}

.hero { padding: 8px 0 20px; }
.hero-kicker { font-size: calc(15px + var(--fs-boost)); color: var(--terracotta); font-weight: 700; letter-spacing: 1px; text-transform: uppercase; }
.hero-title { font-size: calc(30px + var(--fs-boost)); line-height: 1.15; font-weight: 800; margin: 6px 0 10px; color: var(--ink); }
.hero-sub { color: var(--ink-2); font-size: calc(17px + var(--fs-boost)); }

.section-title {
  font-size: calc(15px + var(--fs-boost));
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--ink-2);
  margin: 24px 0 12px;
}

.class-list { display: flex; flex-direction: column; gap: 12px; }
.class-card {
  background: white;
  border: 1px solid var(--soft);
  border-radius: 14px;
  padding: 16px;
  display: flex; align-items: center; gap: 14px;
  cursor: pointer;
  transition: transform 0.15s ease, border-color 0.15s ease;
  text-decoration: none;
  color: inherit;
}
.class-card:active { transform: scale(0.98); }
.class-card.done { border-color: var(--ok); background: #F4F9F5; }
.class-card.locked {
  background: #F7F3EC;
  cursor: not-allowed;
  opacity: 0.7;
}
.class-card.locked:active { transform: none; }

.class-num {
  width: 38px; height: 38px; border-radius: 50%;
  background: var(--cream-2); color: var(--ink);
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 16px; flex-shrink: 0;
}
.class-card.done .class-num { background: var(--ok); color: white; }
.class-card.locked .class-num { background: var(--cream-2); color: var(--locked); }

.class-info { flex: 1; min-width: 0; }
.class-title { font-weight: 700; font-size: calc(17px + var(--fs-boost)); margin-bottom: 2px; }
.class-meta { font-size: calc(15px + var(--fs-boost)); color: var(--ink-2); }
.class-card.locked .class-title { color: var(--locked); }
.class-card.locked .class-meta { color: var(--locked); }
.class-chevron { color: var(--ink-2); font-size: 20px; }
.class-card.locked .class-chevron { color: var(--locked); }

.badge {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 20px;
  margin-left: 6px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  vertical-align: middle;
}
.badge.pronto { background: var(--cream-2); color: var(--ink-2); }
.badge.ok { background: #D8EDD8; color: var(--ok); }

.lesson-title { font-size: calc(28px + var(--fs-boost)); font-weight: 800; line-height: 1.2; margin: 0 0 6px; }
.lesson-kicker { font-size: calc(15px + var(--fs-boost)); color: var(--terracotta); font-weight: 700; text-transform: uppercase; letter-spacing: 1px; margin-bottom: 8px; }
.lesson-time { font-size: calc(15px + var(--fs-boost)); color: var(--ink-2); margin-bottom: 20px; display: flex; align-items: center; gap: 6px; }

.lesson p { font-size: calc(17px + var(--fs-boost)); margin: 14px 0; color: var(--ink); }
.lesson p.lead { font-size: calc(18px + var(--fs-boost)); color: var(--ink); }
.lesson h3 { font-size: calc(20px + var(--fs-boost)); margin: 28px 0 10px; color: var(--forest); font-weight: 800; }
.lesson strong { color: var(--terracotta-dark); font-weight: 700; }
.lesson em { color: var(--ink-2); font-style: italic; }

.callout {
  background: var(--cream-2);
  border-left: 4px solid var(--gold);
  padding: 14px 16px;
  border-radius: 8px;
  margin: 20px 0;
  font-size: calc(16px + var(--fs-boost));
}
.callout-title { font-weight: 800; color: var(--forest); font-size: calc(15px + var(--fs-boost)); text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 6px; }

.tip {
  background: #F0F5F1;
  border-left: 4px solid var(--ok);
  padding: 14px 16px;
  border-radius: 8px;
  margin: 20px 0;
  font-size: calc(16px + var(--fs-boost));
}
.tip-title { font-weight: 800; color: var(--ok); font-size: calc(15px + var(--fs-boost)); text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 6px; }

.figure {
  margin: 24px -4px;
  background: white;
  border: 1px solid var(--soft);
  border-radius: 14px;
  padding: 18px 14px 14px;
}
.figure svg { width: 100%; height: auto; display: block; }
.figure-cap { font-size: calc(15px + var(--fs-boost)); color: var(--ink-2); text-align: center; margin-top: 10px; font-style: italic; }

.key-points {
  background: white;
  border: 1px solid var(--soft);
  border-radius: 14px;
  padding: 16px 18px;
  margin: 24px 0 10px;
}
.key-points-title { font-weight: 800; font-size: calc(16px + var(--fs-boost)); text-transform: uppercase; color: var(--terracotta); letter-spacing: 0.5px; margin-bottom: 10px; }
.key-points ul { margin: 0; padding-left: 18px; }
.key-points li { margin: 6px 0; font-size: calc(16px + var(--fs-boost)); }

.btn {
  display: block; width: 100%;
  padding: 16px; margin-top: 28px;
  background: var(--terracotta); color: white;
  border: none; border-radius: 12px;
  font-size: calc(17px + var(--fs-boost)); font-weight: 700;
  cursor: pointer;
  transition: transform 0.15s ease;
  font-family: inherit;
  text-align: center;
  text-decoration: none;
}
.btn:active { transform: scale(0.98); }
.btn.secondary { background: white; color: var(--ink); border: 1.5px solid var(--soft); margin-top: 12px; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.quiz-q { font-size: calc(19px + var(--fs-boost)); font-weight: 700; margin: 20px 0 16px; line-height: 1.35; }
.quiz-progress { font-size: calc(15px + var(--fs-boost)); color: var(--ink-2); font-weight: 600; margin-bottom: 8px; }
.quiz-options { display: flex; flex-direction: column; gap: 10px; }
.quiz-opt {
  background: white; border: 1.5px solid var(--soft);
  border-radius: 12px; padding: 14px 16px;
  text-align: left; font-size: calc(16px + var(--fs-boost)); cursor: pointer;
  transition: all 0.15s ease; color: var(--ink);
  font-family: inherit;
}
.quiz-opt:active { transform: scale(0.99); }
.quiz-opt.correct { border-color: var(--ok); background: #F0F7F1; color: var(--ok); font-weight: 600; }
.quiz-opt.wrong { border-color: var(--err); background: #FBF0F0; color: var(--err); }
.quiz-opt:disabled { cursor: default; }

.feedback {
  margin-top: 18px; padding: 14px; border-radius: 10px;
  font-size: calc(16px + var(--fs-boost)); line-height: 1.5;
}
.feedback.ok { background: #F0F7F1; color: var(--ok); border: 1px solid #CFE5D4; }
.feedback.bad { background: #FBF0F0; color: var(--err); border: 1px solid #EDD0D0; }

.result-card {
  text-align: center; padding: 30px 20px; background: white;
  border-radius: 16px; border: 1px solid var(--soft); margin-top: 20px;
}
.result-score { font-size: 48px; font-weight: 800; color: var(--terracotta); margin: 10px 0; }
.result-msg { color: var(--ink-2); font-size: calc(16px + var(--fs-boost)); }
.celebrate { font-size: 64px; margin-bottom: 8px; }

.tag {
  display: inline-block;
  background: var(--cream-2);
  color: var(--ink-2);
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 600;
}

.footer {
  padding: 30px 20px 10px;
  text-align: center;
  font-size: calc(14px + var(--fs-boost));
  color: var(--ink-2);
}
.footer a { color: var(--terracotta); font-weight: 600; }
.version { font-size: 12px; color: var(--locked); margin-top: 4px; display: inline-block; }