* {
  box-sizing: border-box;
}

:root {
  --bg: #070b14;
  --panel: rgba(15, 23, 42, 0.9);
  --panel-soft: rgba(255, 255, 255, 0.06);
  --border: rgba(255, 255, 255, 0.13);
  --text: #eef4ff;
  --muted: #94a3b8;
  --green: #32d583;
  --blue: #5b8cff;
  --purple: #9b7cff;
  --red: #ff5c7a;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, Arial, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 18% 20%, rgba(91, 140, 255, 0.28), transparent 28%),
    radial-gradient(circle at 85% 12%, rgba(155, 124, 255, 0.22), transparent 30%),
    radial-gradient(circle at 50% 95%, rgba(50, 213, 131, 0.12), transparent 34%),
    var(--bg);
}

.page {
  width: min(820px, 100%);
  margin: 0 auto;
  padding: 34px 22px;
}

.back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 26px;
  padding: 12px 18px;
  border-radius: 999px;
  color: var(--text);
  text-decoration: none;
  background: rgba(255, 255, 255, 0.075);
  border: 1px solid var(--border);
  font-weight: 900;
  transition: 0.2s ease;
}

.back:hover {
  transform: translateY(-2px);
  border-color: rgba(91, 140, 255, 0.65);
}

.panel {
  padding: 36px;
  border-radius: 34px;
  background: linear-gradient(145deg, rgba(15, 23, 42, 0.94), rgba(17, 24, 39, 0.82));
  border: 1px solid var(--border);
  box-shadow: 0 32px 90px rgba(0, 0, 0, 0.48);
  backdrop-filter: blur(18px);
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--green);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1 {
  margin: 0 0 26px;
  font-size: clamp(38px, 7vw, 64px);
  line-height: 0.95;
  letter-spacing: -0.06em;
}

.mode-selector {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin: 0 0 34px;
  padding: 10px;
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.045);
  border: 1px solid var(--border);
}

.mode,
button {
  width: 100%;
  min-height: 52px;
  padding: 14px 16px;
  border-radius: 17px;
  border: 0;
  font-size: 15px;
  font-weight: 900;
  cursor: pointer;
  transition: 0.2s ease;
}

.mode {
  background: transparent;
  color: var(--muted);
  border: 1px solid transparent;
}

.mode:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.07);
}

.mode.active {
  color: white;
  background: linear-gradient(135deg, var(--blue), var(--purple));
  box-shadow: 0 16px 36px rgba(91, 140, 255, 0.28);
}

#quizBox,
#resultBox {
  padding: 28px;
  border-radius: 28px;
  background: var(--panel-soft);
  border: 1px solid var(--border);
}

.pill {
  display: inline-flex;
  align-items: center;
  margin: 0 0 18px;
  padding: 8px 14px;
  border-radius: 999px;
  color: #b9ccff;
  background: rgba(91, 140, 255, 0.15);
  font-size: 14px;
  font-weight: 900;
}

#direction {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 15px;
  font-weight: 900;
}

#word {
  margin: 0 0 28px;
  font-size: clamp(44px, 9vw, 76px);
  line-height: 1;
  letter-spacing: -0.06em;
}

input {
  width: 100%;
  height: 58px;
  margin-bottom: 16px;
  padding: 0 18px;
  border-radius: 18px;
  border: 1px solid var(--border);
  background: rgba(7, 11, 20, 0.74);
  color: var(--text);
  font-size: 17px;
  outline: none;
  transition: 0.2s ease;
}

input::placeholder {
  color: #64748b;
}

input:focus {
  border-color: rgba(91, 140, 255, 0.9);
  box-shadow: 0 0 0 4px rgba(91, 140, 255, 0.16);
}

#checkBtn {
  margin-top: 4px;
  background: linear-gradient(135deg, var(--green), #12b76a);
  color: #03130b;
  box-shadow: 0 16px 34px rgba(50, 213, 131, 0.2);
}

#nextBtn,
.secondary {
  margin-top: 14px;
  background: rgba(255, 255, 255, 0.085);
  color: var(--text);
  border: 1px solid var(--border);
}

button:hover {
  transform: translateY(-2px);
  filter: brightness(1.05);
}

button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
  filter: none;
}

#feedback {
  min-height: 26px;
  margin: 22px 0 6px;
  font-size: 20px;
  font-weight: 900;
}

#solution {
  min-height: 24px;
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
}

.hidden {
  display: none;
}

#resultBox h2 {
  margin: 0 0 18px;
  font-size: 34px;
}

#resultBox h3 {
  margin: 28px 0 12px;
  color: var(--text);
}

#resultBox p {
  margin: 8px 0;
  color: var(--muted);
}

#resultBox strong {
  color: var(--text);
}

ul {
  padding: 0;
  margin: 0;
  list-style: none;
}

li {
  margin: 10px 0;
  padding: 16px;
  border-radius: 18px;
  background: rgba(7, 11, 20, 0.45);
  border: 1px solid var(--border);
  line-height: 1.6;
}

#correctWrongBtn {
  margin-top: 24px;
}

#restartBtn {
  margin-top: 14px;
}

@media (max-width: 680px) {
  .page {
    padding: 22px 14px;
  }

  .panel {
    padding: 22px;
    border-radius: 26px;
  }

  .mode-selector {
    grid-template-columns: 1fr;
    gap: 10px;
    margin-bottom: 24px;
  }

  #quizBox,
  #resultBox {
    padding: 20px;
  }

  h1 {
    margin-bottom: 22px;
  }

  #word {
    margin-bottom: 24px;
  }
}