:root {
  --ink: #0f172a;
  --muted: #64748b;
  --paper: #f8fafc;
  --accent: #f97316;
  --accent-deep: #ea580c;
  --leaf: #0f766e;
  --danger: #dc2626;
  --shadow: rgba(15, 23, 42, 0.18);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Space Grotesk", "Segoe UI", sans-serif;
  color: var(--ink);
  background: radial-gradient(circle at 20% 10%, #fff2e1 0%, #f8fafc 55%, #e2e8f0 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px 18px 48px;
}

.bg-glow {
  position: fixed;
  inset: 0;
  background: linear-gradient(120deg, rgba(249, 115, 22, 0.15), rgba(15, 118, 110, 0.1));
  filter: blur(80px);
  z-index: -1;
}

.shell {
  width: min(520px, 100%);
  display: grid;
  gap: 22px;
  animation: fadeUp 0.6s ease-out;
}

.mode {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.mode-btn {
  border: 1px solid #e2e8f0;
  background: #fff;
  padding: 8px 12px;
  border-radius: 999px;
  font-size: 13px;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.mode-btn.active {
  border-color: var(--accent);
  box-shadow: 0 8px 16px var(--shadow);
}

.card {
  background: var(--paper);
  border-radius: 24px;
  padding: 26px;
  box-shadow: 0 24px 48px rgba(15, 23, 42, 0.12);
  display: grid;
  gap: 16px;
}

.filters {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.filters > label {
  display: grid;
  gap: 6px;
  font-size: 12px;
  color: var(--muted);
}

.tag-list {
  min-height: 84px;
  max-height: 180px;
  overflow: auto;
  border-radius: 10px;
  border: 1px solid #e2e8f0;
  background: #fff;
  font-family: inherit;
  font-size: 13px;
  padding: 6px;
  display: grid;
  gap: 6px;
}

.tag-item {
  display: flex;
  align-items: center;
  gap: 8px;
}

.option-field {
  display: grid;
  gap: 6px;
  font-size: 12px;
  color: var(--muted);
}

.option-field input {
  width: 100%;
  padding: 8px 10px;
  border-radius: 10px;
  border: 1px solid #e2e8f0;
  font-size: 14px;
}

.label {
  color: var(--muted);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  margin: 0;
}

.prompt {
  font-size: 26px;
  font-weight: 600;
}

.answer-stack {
  display: grid;
  gap: 10px;
}

.answer-field {
  display: grid;
  gap: 6px;
  font-size: 13px;
  color: var(--muted);
}

.answer-input {
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid #e2e8f0;
  font-size: 16px;
  background: #fff;
}

.answer-input[readonly] {
  background: #f8fafc;
}

.answer-input.is-correct {
  border-color: #15803d;
  box-shadow: 0 0 0 2px rgba(21, 128, 61, 0.12);
}

.answer-input.is-incorrect {
  border-color: #dc2626;
  box-shadow: 0 0 0 2px rgba(220, 38, 38, 0.12);
}

.actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.button-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.button-left {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
}

.login-area {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}

.queue-status {
  display: inline-flex;
  align-items: center;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid #f59e0b;
  background: #fffbeb;
  color: #92400e;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.01em;
}


button {
  font-family: inherit;
}

.primary {
  background: var(--accent);
  border: none;
  color: #fff;
  padding: 10px 16px;
  border-radius: 12px;
  cursor: pointer;
}

.primary:hover {
  background: var(--accent-deep);
}

.ghost {
  background: transparent;
  border: 1px solid #cbd5f5;
  padding: 10px 16px;
  border-radius: 12px;
  cursor: pointer;
}

.result {
  border-top: 1px solid #e2e8f0;
  padding-top: 14px;
  display: grid;
  gap: 8px;
}

.hidden {
  display: none !important;
}

.result-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
}

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

.grade {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.success {
  background: var(--leaf);
  color: #fff;
  border: none;
  padding: 10px 16px;
  border-radius: 12px;
}

.danger {
  background: var(--danger);
  color: #fff;
  border: none;
  padding: 10px 16px;
  border-radius: 12px;
}

.options {
  background: rgba(255, 255, 255, 0.8);
  border-radius: 18px;
  padding: 14px 16px;
  box-shadow: 0 12px 28px rgba(15, 23, 42, 0.08);
}

.options summary {
  cursor: pointer;
  font-size: 14px;
  color: var(--muted);
  list-style: none;
}

.options summary::-webkit-details-marker {
  display: none;
}

.docs {
  background: rgba(255, 255, 255, 0.8);
  border-radius: 18px;
  padding: 14px 16px;
  box-shadow: 0 12px 28px rgba(15, 23, 42, 0.08);
}

.docs summary {
  cursor: pointer;
  font-size: 14px;
  color: var(--muted);
  list-style: none;
}

.docs summary::-webkit-details-marker {
  display: none;
}

.docs-body {
  margin-top: 12px;
  display: grid;
  gap: 10px;
  font-size: 13px;
  color: var(--ink);
}

.docs-body h4 {
  margin: 8px 0 0;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.docs-body p {
  margin: 0;
  color: var(--muted);
}

.docs-body ul {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
}

.options-grid {
  margin-top: 12px;
  display: grid;
  gap: 14px;
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 520px) {
  .filters {
    grid-template-columns: 1fr;
  }

  .card {
    padding: 22px;
  }

  .prompt {
    font-size: 22px;
  }
}