:root {
  --green: #1f4d3a;
  --green-light: #2f6b52;
  --cream: #f3efe4;
  --gold: #c99a3c;
  --ink: #24291f;
  --muted: #6b7568;
  --card: #ffffff;
  --danger: #b3402f;
  --radius: 14px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--cream);
  color: var(--ink);
}

.screen { display: none; min-height: 100vh; padding: 24px 20px 60px; max-width: 480px; margin: 0 auto; }
.screen.active { display: block; }

.brand { text-align: center; margin-bottom: 18px; }
.brand .icon {
  width: 56px; height: 56px; border-radius: 50%; background: var(--green);
  display: flex; align-items: center; justify-content: center;
  font-size: 0; margin: 0 auto 10px;
  background-image: url("data:image/png;base64,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");
  background-repeat: no-repeat; background-position: center; background-size: 30px auto;
}
.brand h1 { font-size: 22px; color: var(--green); margin: 0 0 6px; text-align: center; }
.badge {
  display: inline-block; background: #fff3d6; color: var(--gold); border: 1px solid #ecd9a6;
  padding: 4px 12px; border-radius: 999px; font-size: 13px; font-weight: 600;
}
.badge-row { text-align: center; margin-bottom: 18px; }

.lang-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin: 18px 0; }
.lang-btn, .btn-secondary {
  background: white; border: 1px solid #ddd6c4; border-radius: 999px; padding: 12px;
  font-size: 15px; cursor: pointer; text-align: center;
}
.lang-btn.selected { border-color: var(--green); color: var(--green); font-weight: 600; }

.footnote {
  font-size: 12px; color: var(--muted); background: white; border-radius: var(--radius);
  padding: 12px 14px; margin-top: 30px; text-align: center; border: 1px solid #eee5cf;
}

.btn-primary {
  display: block; width: 100%; background: var(--green); color: white; border: none;
  border-radius: 999px; padding: 15px; font-size: 16px; font-weight: 600; cursor: pointer;
  margin-top: 14px;
}
.btn-primary:disabled { opacity: .5; cursor: not-allowed; }
.btn-primary.danger { background: var(--danger); }

.card {
  background: var(--card); border-radius: var(--radius); padding: 16px; margin-bottom: 12px;
  border: 1px solid #eee5cf;
}
.row { display: flex; align-items: center; justify-content: space-between; }
.row-list .card { display: flex; align-items: center; justify-content: space-between; cursor: pointer; }
.row-title { font-weight: 600; }
.row-sub { font-size: 12px; color: var(--muted); margin-top: 2px; }
.lock { color: var(--gold); font-size: 13px; font-weight: 600; }
.free-tag { color: var(--green); font-size: 13px; font-weight: 600; }

.section-title { font-size: 13px; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); margin: 22px 0 8px; }

.progress-bar { height: 6px; background: #e7e0cc; border-radius: 4px; overflow: hidden; margin-bottom: 18px; }
.progress-bar > div { height: 100%; background: var(--green); }

.question-text { font-size: 18px; font-weight: 600; margin: 6px 0 18px; line-height: 1.4; }
.option {
  display: block; width: 100%; text-align: left; background: white; border: 1px solid #ddd6c4;
  border-radius: 12px; padding: 14px; margin-bottom: 10px; font-size: 15px; cursor: pointer;
}
.option.correct { border-color: var(--green); background: #eaf5ee; }
.option.incorrect { border-color: var(--danger); background: #fbecea; }
.option:disabled { cursor: default; }
.explanation { font-size: 14px; background: #f7f3e6; border-radius: 10px; padding: 14px; margin-top: 4px; color: #4a4232; }
.explain-row { margin-bottom: 10px; }
.explain-row:last-child { margin-bottom: 0; }
.explain-label { font-size: 11px; text-transform: uppercase; letter-spacing: .04em; color: var(--green); font-weight: 700; margin-bottom: 3px; }
.explain-answer { font-weight: 600; }
.values-badge {
  display: inline-block; background: #fff3d6; color: var(--gold); border: 1px solid #ecd9a6;
  font-size: 11px; font-weight: 700; padding: 3px 10px; border-radius: 999px; margin-bottom: 10px;
}
.memory-cue { font-size: 12px; color: var(--gold); margin-top: 0; }

.exam-timer { text-align: center; font-size: 14px; font-weight: 700; color: var(--green); margin-bottom: 10px; }
.exam-timer.low-time { color: var(--danger); }

.exam-breakdown { background: #f7f3e6; border-radius: 10px; padding: 16px; margin: 18px 0; font-size: 14px; text-align: left; }
.exam-breakdown .result-line { font-size: 18px; font-weight: 700; margin-bottom: 8px; text-align: center; }
.exam-breakdown .result-line.pass { color: var(--green); }
.exam-breakdown .result-line.fail { color: var(--danger); }
.exam-breakdown .breakdown-row { margin-bottom: 8px; }
.exam-breakdown .breakdown-note { color: var(--muted); font-size: 13px; }

.score-circle {
  width: 120px; height: 120px; border-radius: 50%; border: 8px solid var(--green);
  display: flex; align-items: center; justify-content: center; margin: 20px auto;
  font-size: 28px; font-weight: 700; color: var(--green);
}

.feature-list { list-style: none; padding: 0; margin: 16px 0; }
.feature-list li { padding: 8px 0 8px 26px; position: relative; font-size: 14px; }
.feature-list li::before { content: "✓"; position: absolute; left: 0; color: var(--green); font-weight: 700; }

.price { font-size: 34px; font-weight: 700; color: var(--green); text-align: center; margin: 10px 0 0; }
.price-sub { text-align: center; color: var(--muted); font-size: 13px; margin-bottom: 18px; }

input[type="email"] {
  width: 100%; padding: 13px 14px; border-radius: 10px; border: 1px solid #ddd6c4; font-size: 15px;
}

.link-btn { background: none; border: none; color: var(--muted); text-decoration: underline; cursor: pointer; font-size: 14px; }
.center { text-align: center; }
.top-nav { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; }
.top-nav button { background: none; border: none; font-size: 20px; cursor: pointer; }
.msg { font-size: 13px; padding: 10px 12px; border-radius: 10px; margin-top: 10px; }
.msg.error { background: #fbecea; color: var(--danger); }
.msg.ok { background: #eaf5ee; color: var(--green); }