:root {
  --bg: #0b1020;
  --card: #121a33;
  --text: #e9eeff;
  --muted: #aeb7e6;
  --border: rgba(255, 255, 255, 0.12);
  --primary: #5b8cff;
  --primary-2: #3a66d8;
  --ok: #35d07f;
  --bad: #ff5c7a;
  --focus: rgba(91, 140, 255, 0.35);
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto,
    Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  background: radial-gradient(1200px 700px at 20% -10%, #1b2a5a 0%, transparent 60%),
    radial-gradient(900px 600px at 90% 0%, #2d4aa8 0%, transparent 55%),
    var(--bg);
  color: var(--text);
  line-height: 1.4;
}

.app {
  max-width: 980px;
  margin: 0 auto;
  padding: 28px 18px 40px;
}

.topbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

.topbar__stats {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.topbar h1 {
  margin: 0 0 6px;
  font-size: 24px;
}

.subtitle {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.statusLine {
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--muted);
  min-width: 240px;
  text-align: right;
  font-size: 13px;
}

.card {
  background: rgba(18, 26, 51, 0.72);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 18px;
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.25);
}

.levelHeader {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.levelHeader__title {
  font-weight: 700;
  font-size: 16px;
}

.levelHeader__meta {
  color: var(--muted);
  font-size: 13px;
}

.levelForm {
  margin: 0;
}

.examplesList {
  display: grid;
  gap: 10px;
}

.example {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  align-items: center;
  padding: 12px 12px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.03);
}

.example__prompt {
  font-weight: 650;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: baseline;
}

.example__prompt .eq {
  color: var(--muted);
  font-weight: 600;
}

.example__feedback {
  font-size: 13px;
  color: var(--muted);
  min-height: 18px;
  text-align: right;
}

.example__feedback--ok {
  color: rgba(53, 208, 127, 0.95);
}

.example__feedback--bad {
  color: rgba(255, 92, 122, 0.95);
}

.inputWrap {
  display: flex;
  align-items: center;
  gap: 10px;
}

.answerInput {
  width: 110px;
  background: rgba(0, 0, 0, 0.22);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 12px;
  border-radius: 12px;
  outline: none;
}

.answerInput:focus {
  border-color: rgba(91, 140, 255, 0.55);
  box-shadow: 0 0 0 4px var(--focus);
}

.answerInput:disabled {
  opacity: 0.75;
  cursor: not-allowed;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: flex-start;
  margin-top: 14px;
  align-items: center;
}

.btn {
  appearance: none;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.03);
  color: var(--text);
  border-radius: 14px;
  padding: 10px 14px;
  font-weight: 650;
  cursor: pointer;
  transition: background 140ms ease, border-color 140ms ease, transform 70ms ease;
}

.btn:active {
  transform: translateY(1px);
}

.btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 4px var(--focus);
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.btn-primary {
  background: rgba(91, 140, 255, 0.18);
  border-color: rgba(91, 140, 255, 0.45);
}

.btn-primary:hover:not(:disabled) {
  background: rgba(91, 140, 255, 0.26);
  border-color: rgba(91, 140, 255, 0.65);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.04);
}

.btn-secondary:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.07);
}

.btn-ghost {
  background: transparent;
}

.resultsSummary {
  margin-top: 12px;
  padding: 12px;
  border-radius: 14px;
  border: 1px dashed rgba(255, 255, 255, 0.16);
  color: var(--muted);
  min-height: 28px;
}

.completionSummary {
  margin-top: 12px;
  padding: 12px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.03);
  color: var(--muted);
  min-height: 28px;
}

.example.is-correct {
  border-color: rgba(53, 208, 127, 0.35);
  background: rgba(53, 208, 127, 0.08);
}

.example.is-wrong {
  border-color: rgba(255, 92, 122, 0.4);
  background: rgba(255, 92, 122, 0.07);
}

.footer {
  margin-top: 14px;
  color: var(--muted);
  font-size: 13px;
}

@media (max-width: 680px) {
  .topbar {
    flex-direction: column;
    align-items: flex-start;
  }
  .statusLine {
    min-width: unset;
    text-align: left;
  }
  .example {
    grid-template-columns: 1fr;
  }
  .example__feedback {
    text-align: left;
  }
  .answerInput {
    width: 100%;
  }
}