:root {
  --bg: #020617;
  --panel: rgba(15, 23, 42, 0.92);
  --panel-soft: rgba(15, 23, 42, 0.75);
  --border: rgba(148, 163, 184, 0.18);
  --text: #f8fafc;
  --muted: #cbd5e1;
  --subtle: #94a3b8;
  --pink: #d946ef;
  --pink-soft: rgba(217, 70, 239, 0.16);
  --sky: #38bdf8;
  --emerald: #34d399;
  --amber: #fbbf24;
  --rose: #fb7185;
  --shadow: 0 24px 80px rgba(2, 6, 23, 0.45);
  --radius-xl: 32px;
  --radius-lg: 24px;
  --radius-md: 18px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(217, 70, 239, 0.18), transparent 30%),
    radial-gradient(circle at top right, rgba(56, 189, 248, 0.18), transparent 28%),
    linear-gradient(180deg, #020617 0%, #0f172a 100%);
}

body {
  padding: 24px;
}

.app-shell {
  max-width: 1200px;
  margin: 0 auto;
}

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
}

.hero {
  padding: 28px;
  margin-bottom: 24px;
  background:
    linear-gradient(135deg, rgba(15, 23, 42, 0.96), rgba(49, 46, 129, 0.86)),
    var(--panel);
}

.hero-grid,
.main-grid,
.zone-grid,
.badges-grid {
  display: grid;
  gap: 20px;
}

.hero-grid {
  grid-template-columns: 1.35fr 0.9fr;
  align-items: start;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 999px;
  background: var(--pink-soft);
  color: #f5d0fe;
  font-weight: 700;
  font-size: 0.9rem;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.1;
}

h1 {
  margin-top: 16px;
  font-size: clamp(2.3rem, 4vw, 4.4rem);
}

p {
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}

.hero-stats,
.badges-grid,
.mission-list,
.button-row,
.chips,
.answer-list {
  display: grid;
  gap: 12px;
}

.hero-stats {
  margin-top: 24px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.stat,
.progress-card,
.tab-button,
.badge,
.panel,
.option,
.sequence-item,
.result-box,
.score-box,
.question-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.stat,
.progress-card,
.badge,
.panel,
.score-box,
.question-card {
  background: rgba(255, 255, 255, 0.04);
}

.stat,
.progress-card,
.badge,
.panel,
.score-box,
.question-card,
.result-box {
  padding: 18px;
}

.label {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--subtle);
  font-size: 0.74rem;
}

.value {
  margin-top: 8px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.9rem;
  font-weight: 900;
}

.progress-bar {
  height: 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.1);
  overflow: hidden;
  margin-top: 14px;
}

.progress-fill {
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--pink), var(--sky), var(--emerald));
  transition: width 0.35s ease;
}

.mini-fill {
  background: linear-gradient(90deg, var(--amber), var(--pink));
}

.mission-list {
  margin-top: 16px;
}

.mission-item {
  padding: 12px 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  color: var(--muted);
}

.mission-item.done {
  background: rgba(52, 211, 153, 0.12);
  color: #d1fae5;
  border-color: rgba(52, 211, 153, 0.3);
}

.main-grid {
  grid-template-columns: 1fr 0.9fr;
  margin-bottom: 24px;
}

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

button,
input {
  font: inherit;
}

.tab-button,
.action,
.option,
.answer-button {
  cursor: pointer;
  transition: transform 0.18s ease, background 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}

.tab-button:hover,
.action:hover,
.option:hover,
.answer-button:hover {
  transform: translateY(-1px);
}

.tab-button {
  padding: 12px 18px;
  background: rgba(15, 23, 42, 0.88);
  color: var(--muted);
}

.tab-button.active {
  background: linear-gradient(135deg, #c026d3, #db2777);
  color: white;
  border-color: transparent;
}

.zone-grid {
  grid-template-columns: 1fr 1.08fr;
}

.zone-grid.equal {
  grid-template-columns: 1fr 1fr;
}

.zone-grid.quiz {
  grid-template-columns: 1fr 0.78fr;
}

.section-header,
.panel-header {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 18px;
}

.task-tag {
  white-space: nowrap;
  padding: 9px 12px;
  border-radius: 999px;
  font-size: 0.88rem;
  font-weight: 700;
}

.task-pink { background: rgba(217, 70, 239, 0.18); color: #f5d0fe; }
.task-sky { background: rgba(56, 189, 248, 0.18); color: #dbeafe; }
.task-green { background: rgba(52, 211, 153, 0.18); color: #d1fae5; }
.task-amber { background: rgba(251, 191, 36, 0.18); color: #fef3c7; }

.example-grid,
.options-grid {
  margin-top: 20px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.example-card,
.option {
  padding: 16px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: rgba(2, 6, 23, 0.72);
}

.example-card.active,
.option.active,
.answer-button.selected {
  border-color: rgba(217, 70, 239, 0.75);
  background: rgba(217, 70, 239, 0.12);
}

.rule-box,
.showcase,
.preview-strip,
.sequence-box,
.schema-box {
  margin-top: 20px;
}

.rule-box,
.showcase,
.sequence-box,
.schema-box,
.result-box {
  background: rgba(2, 6, 23, 0.72);
}

.rule-box,
.showcase,
.sequence-box,
.schema-box {
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  padding: 18px;
}

.showcase-binary,
.binary-chip {
  font-family: Consolas, "Courier New", monospace;
}

.showcase-binary {
  margin-top: 16px;
  border-radius: 16px;
  border: 1px solid rgba(132, 204, 22, 0.22);
  background: rgba(0, 0, 0, 0.82);
  padding: 14px;
  color: #bef264;
  word-break: break-word;
}

.input-group {
  margin-top: 20px;
}

.input-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 700;
  color: var(--muted);
}

.text-input {
  width: 100%;
  padding: 14px 16px;
  border-radius: 18px;
  border: 1px solid rgba(148, 163, 184, 0.3);
  background: rgba(2, 6, 23, 0.84);
  color: white;
}

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

.binary-chip {
  padding: 10px 12px;
  border-radius: 14px;
  border: 1px solid rgba(148, 163, 184, 0.22);
  background: rgba(2, 6, 23, 0.78);
  color: #bae6fd;
  font-size: 0.9rem;
}

.button-row {
  margin-top: 18px;
  grid-auto-flow: column;
  justify-content: start;
}

.action {
  padding: 12px 16px;
  border: 0;
  border-radius: 16px;
  font-weight: 800;
}

.primary { background: linear-gradient(135deg, #c026d3, #db2777); color: white; }
.secondary { background: rgba(51, 65, 85, 0.9); color: #e2e8f0; }

.status-box {
  margin-top: 20px;
  padding: 16px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: rgba(2, 6, 23, 0.72);
  color: var(--muted);
  line-height: 1.7;
}

.status-box.success {
  background: rgba(52, 211, 153, 0.12);
  color: #d1fae5;
  border-color: rgba(52, 211, 153, 0.32);
}

.sequence-box,
.schema-box {
  min-height: 180px;
}

.sequence-line,
.schema-line {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.sequence-item,
.schema-node,
.badge-icon {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.sequence-item,
.schema-node {
  padding: 12px 16px;
  background: rgba(217, 70, 239, 0.1);
  color: white;
}

.schema-node {
  background: rgba(15, 23, 42, 0.9);
}

.schema-node.final {
  color: #d1fae5;
  border-color: rgba(52, 211, 153, 0.32);
  background: rgba(52, 211, 153, 0.12);
}

.arrow {
  color: var(--subtle);
  font-size: 1.25rem;
}

.badges-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-bottom: 24px;
}

.badge {
  display: flex;
  align-items: center;
  gap: 14px;
}

.badge.unlocked {
  background: rgba(251, 191, 36, 0.12);
  border-color: rgba(251, 191, 36, 0.3);
}

.badge-icon {
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: 18px;
  background: rgba(148, 163, 184, 0.25);
  font-size: 1.45rem;
}

.badge.unlocked .badge-icon {
  background: linear-gradient(135deg, #f59e0b, #f97316);
}

.badge-title {
  font-weight: 800;
  color: white;
}

.badge-state {
  margin-top: 4px;
  color: var(--subtle);
  font-size: 0.92rem;
}

.questions {
  margin-top: 22px;
  display: grid;
  gap: 18px;
}

.answer-list {
  margin-top: 14px;
}

.answer-button {
  width: 100%;
  padding: 14px 16px;
  text-align: left;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: rgba(15, 23, 42, 0.84);
  color: #e2e8f0;
}

.answer-button.correct {
  background: rgba(52, 211, 153, 0.12);
  border-color: rgba(52, 211, 153, 0.35);
  color: #d1fae5;
}

.answer-button.wrong {
  background: rgba(251, 113, 133, 0.14);
  border-color: rgba(251, 113, 133, 0.38);
  color: #ffe4e6;
}

.explain {
  margin-top: 14px;
  color: var(--muted);
}

.score-box {
  position: sticky;
  top: 24px;
  height: fit-content;
}

.score-number {
  margin-top: 6px;
  font-size: 4rem;
  font-weight: 900;
}

.stars {
  margin-top: 14px;
  font-size: 1.4rem;
  letter-spacing: 0.08em;
  color: var(--amber);
}

.fade-in {
  animation: fadeUp 0.35s ease;
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 1024px) {
  .hero-grid,
  .main-grid,
  .zone-grid,
  .zone-grid.equal,
  .zone-grid.quiz,
  .badges-grid {
    grid-template-columns: 1fr;
  }

  .hero-stats {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  body {
    padding: 14px;
  }

  .hero,
  .panel,
  .score-box,
  .progress-card,
  .question-card,
  .badge {
    padding: 16px;
  }

  .button-row {
    grid-auto-flow: row;
  }

  .example-grid,
  .options-grid {
    grid-template-columns: 1fr;
  }
}