:root {
  --bg: #0a0f1f;
  --bg-2: #131b3a;
  --card: #171f3b;
  --card-2: #1f2a52;
  --ink: #f8f6ff;
  --muted: #b4b9d6;
  --accent: #22e3b5;
  --accent-2: #ff6b6b;
  --accent-3: #6aa8ff;
  --accent-4: #ffd166;
  --accent-soft: rgba(34, 227, 181, 0.15);
  --shadow: 0 30px 60px rgba(7, 10, 22, 0.45);
  --glow: 0 0 24px rgba(34, 227, 181, 0.45);
  --glow-strong: 0 0 36px rgba(106, 168, 255, 0.45);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Space Grotesk", "Trebuchet MS", sans-serif;
  color: var(--ink);
  background: radial-gradient(circle at 12% 12%, rgba(255, 209, 102, 0.2), transparent 40%),
    radial-gradient(circle at 80% 0%, rgba(34, 227, 181, 0.25), transparent 42%),
    radial-gradient(circle at 70% 90%, rgba(106, 168, 255, 0.2), transparent 40%),
    linear-gradient(135deg, var(--bg), var(--bg-2));
}

body::before,
body::after {
  content: "";
  position: fixed;
  width: 380px;
  height: 380px;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.25;
  z-index: -1;
}

body::before {
  top: -140px;
  left: -60px;
  background: radial-gradient(circle, var(--accent-3), transparent 70%);
}

body::after {
  bottom: -160px;
  right: -80px;
  background: radial-gradient(circle, var(--accent-2), transparent 70%);
}

#app::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image: linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 42px 42px;
  pointer-events: none;
  opacity: 0.4;
  z-index: -1;
}

#app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.topbar {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding: 18px 32px 14px;
  align-items: center;
  flex-wrap: wrap;
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(10, 15, 31, 0.75);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.brand {
  display: flex;
  gap: 16px;
  align-items: center;
}

.brand h1 {
  margin: 0;
  font-size: 24px;
  letter-spacing: 0.6px;
}

.brand p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 14px;
}

h2 {
  font-size: 24px;
  margin-bottom: 8px;
}

h3 {
  margin-bottom: 8px;
}

p {
  color: var(--muted);
}

.muted {
  color: var(--muted);
}

.logo {
  background: linear-gradient(135deg, var(--accent), var(--accent-3));
  color: #0c1020;
  font-weight: 700;
  padding: 12px 16px;
  border-radius: 16px;
  letter-spacing: 1px;
  box-shadow: var(--glow-strong);
  position: relative;
  overflow: hidden;
}

.logo::after {
  content: "";
  position: absolute;
  inset: -40% 60% 40% -60%;
  background: linear-gradient(120deg, transparent, rgba(255, 255, 255, 0.6), transparent);
  opacity: 0.5;
  transform: translateX(-120%);
  animation: shimmer 3.5s ease-in-out infinite;
}

.stats {
  display: flex;
  gap: 16px;
}

.nav-tools {
  display: flex;
  align-items: center;
  gap: 12px;
}

.profile-switch {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: #d6f2ff;
  background: rgba(15, 26, 46, 0.6);
  border: 1px solid rgba(114, 168, 221, 0.3);
  border-radius: 999px;
  padding: 6px 12px;
}

.profile-switch select {
  background: rgba(11, 18, 32, 0.9);
  color: #eaf6ff;
  border: 1px solid rgba(114, 168, 221, 0.4);
  border-radius: 999px;
  padding: 4px 10px;
  font: inherit;
}

.profile-switch select:focus {
  outline: 2px solid rgba(114, 168, 221, 0.7);
  outline-offset: 2px;
}

.user-chip {
  font-size: 12px;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(106, 168, 255, 0.15);
  border: 1px solid rgba(106, 168, 255, 0.45);
  color: var(--ink);
  letter-spacing: 0.2px;
}

.nav-status {
  font-size: 12px;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--muted);
  letter-spacing: 0.3px;
  text-transform: uppercase;
}

.main-nav {
  display: flex;
  gap: 10px;
  padding: 8px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: var(--shadow);
}

.nav-button {
  background: transparent;
  border: 1px solid transparent;
  color: var(--muted);
  padding: 8px 14px;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 600;
  letter-spacing: 0.2px;
  transition: color 0.2s ease, border 0.2s ease, background 0.2s ease, transform 0.2s ease;
}

.nav-button:hover {
  color: var(--ink);
  border-color: rgba(34, 227, 181, 0.5);
  background: rgba(34, 227, 181, 0.08);
  transform: translateY(-1px);
}

.nav-button.active {
  color: #0c1020;
  background: linear-gradient(135deg, var(--accent), var(--accent-3));
  border-color: transparent;
  box-shadow: var(--glow);
}

.stat {
  background: linear-gradient(145deg, var(--card), var(--card-2));
  padding: 12px 16px;
  border-radius: 16px;
  box-shadow: var(--shadow);
  min-width: 90px;
  text-align: center;
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.stat .label {
  display: block;
  font-size: 12px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.stat .value {
  font-size: 18px;
  font-weight: 700;
}

.content {
  padding: 12px 32px 32px;
  flex: 1;
}

.view {
  display: none;
  animation: fadeIn 0.3s ease;
}

.view.active {
  display: block;
}

.view-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 16px;
}

.card {
  background: linear-gradient(150deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.01));
  padding: 20px;
  border-radius: 18px;
  box-shadow: var(--shadow);
  border: 1px solid rgba(255, 255, 255, 0.08);
  text-align: left;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border 0.2s ease;
  color: var(--ink);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(34, 227, 181, 0.12), transparent 60%);
  opacity: 0;
  transition: opacity 0.2s ease;
}

.card:hover {
  transform: translateY(-4px) scale(1.01);
  box-shadow: 0 30px 70px rgba(7, 9, 18, 0.4);
  border-color: rgba(34, 227, 181, 0.4);
}

.card:hover::before {
  opacity: 1;
}

.card h3 {
  font-size: 20px;
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
}

.skill-card {
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.02));
  border-radius: 18px;
  padding: 18px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: var(--shadow);
  display: grid;
  gap: 8px;
  position: relative;
  overflow: hidden;
}

.skill-card.is-locked {
  opacity: 0.6;
}

.skill-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.skill-week {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--muted);
}

.skill-level {
  font-size: 12px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  border: 1px solid rgba(255, 255, 255, 0.18);
}

.level-0 {
  color: var(--muted);
}

.level-1 {
  color: var(--accent);
  border-color: rgba(34, 227, 181, 0.5);
}

.level-2 {
  color: var(--accent-3);
  border-color: rgba(106, 168, 255, 0.5);
}

.level-3 {
  color: var(--accent-4);
  border-color: rgba(255, 209, 102, 0.55);
}

.skill-footer {
  display: flex;
  justify-content: flex-end;
}

.skill-chip {
  font-size: 12px;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(34, 227, 181, 0.12);
  color: var(--accent);
}

.skill-chip.locked {
  background: rgba(255, 255, 255, 0.08);
  color: var(--muted);
}

.shop-list {
  display: grid;
  gap: 12px;
}

.shop-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 12px;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.03);
}

.shop-item p {
  margin: 4px 0 0;
  font-size: 12px;
}

.frame-neon {
  border: 1px solid rgba(34, 227, 181, 0.55);
  box-shadow: 0 0 22px rgba(34, 227, 181, 0.25);
}

.frame-royal {
  border: 1px solid rgba(106, 168, 255, 0.6);
  box-shadow: 0 0 26px rgba(106, 168, 255, 0.25);
}

.foil-cosmic::after {
  content: "";
  position: absolute;
  inset: -40% -10%;
  background: radial-gradient(circle, rgba(106, 168, 255, 0.2), transparent 60%);
  opacity: 0.7;
  pointer-events: none;
}

.foil-ember::after {
  content: "";
  position: absolute;
  inset: -40% -10%;
  background: radial-gradient(circle, rgba(255, 107, 107, 0.22), transparent 60%);
  opacity: 0.7;
  pointer-events: none;
}

.panel {
  background: linear-gradient(160deg, var(--card), var(--card-2));
  padding: 20px;
  border-radius: 18px;
  box-shadow: var(--shadow);
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.panel.hint {
  margin-top: 20px;
  background: linear-gradient(140deg, rgba(34, 227, 181, 0.12), rgba(106, 168, 255, 0.08));
  border: 1px dashed rgba(34, 227, 181, 0.5);
}

.panel h3 {
  margin-top: 0;
}

.primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-3));
  color: #0c1020;
  border: none;
  padding: 12px 18px;
  border-radius: 14px;
  cursor: pointer;
  font-size: 16px;
  font-weight: 700;
  box-shadow: var(--glow);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.primary:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 0 34px rgba(34, 227, 181, 0.6);
}

.primary:focus-visible,
.ghost:focus-visible,
.nav-button:focus-visible {
  outline: 2px solid rgba(255, 209, 102, 0.9);
  outline-offset: 2px;
}

.ghost {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.35);
  color: var(--ink);
  padding: 10px 16px;
  border-radius: 12px;
  cursor: pointer;
}

.ghost.small {
  padding: 8px 12px;
  font-size: 13px;
}

.ghost:hover {
  border-color: rgba(34, 227, 181, 0.6);
  color: var(--accent);
}

.ghost:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  border-color: rgba(255, 255, 255, 0.2);
  color: var(--muted);
}

.cta {
  margin-top: 20px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.lesson {
  margin-top: 24px;
}

.lesson.hidden {
  display: none;
}

.lesson h3 {
  margin-top: 0;
}

.question {
  margin: 16px 0;
}

.question-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.result-tag {
  font-size: 12px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

.result-list {
  display: grid;
  gap: 8px;
  margin: 12px 0 18px;
}

.result-item {
  display: flex;
  align-items: center;
  gap: 10px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 12px;
  padding: 8px 12px;
}

.result-text {
  flex: 1;
}

.result-badge {
  font-size: 12px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

.result-item .result-icon {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
}

.result-item.correct {
  border-color: rgba(34, 227, 181, 0.6);
}

.result-item.correct .result-icon {
  background: rgba(34, 227, 181, 0.2);
  color: var(--accent);
}

.result-item.correct .result-badge {
  color: var(--accent);
  background: rgba(34, 227, 181, 0.15);
}

.result-item.incorrect,
.result-item.unanswered {
  border-color: rgba(255, 107, 107, 0.6);
}

.result-item.incorrect .result-icon,
.result-item.unanswered .result-icon {
  background: rgba(255, 107, 107, 0.2);
  color: var(--accent-2);
}

.result-item.incorrect .result-badge,
.result-item.unanswered .result-badge {
  color: var(--accent-2);
  background: rgba(255, 107, 107, 0.15);
}

.options {
  display: grid;
  gap: 8px;
}

.locked {
  opacity: 0.55;
  pointer-events: none;
}

.chip {
  display: inline-block;
  background: rgba(255, 255, 255, 0.08);
  color: var(--accent);
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 12px;
  margin-top: 8px;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  border: 1px solid rgba(34, 227, 181, 0.35);
}

.link-list {
  list-style: none;
  padding-left: 0;
}

.link-list li {
  margin: 8px 0;
}

.link-list a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}

.link-list a:hover {
  text-decoration: underline;
}

.score {
  font-weight: 700;
}

.mistakes {
  margin: 18px 0 8px;
  display: grid;
  gap: 14px;
}

.mistake-card {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  padding: 14px;
  border-radius: 14px;
}

.mistake-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.mistake-card.incorrect {
  border-color: rgba(255, 107, 107, 0.6);
}

.mistake-card.unanswered {
  border-color: rgba(255, 107, 107, 0.6);
}

.mistake-card p {
  margin: 6px 0;
}

.badges {
  padding-left: 18px;
}

.footer {
  text-align: center;
  padding: 16px;
  color: var(--muted);
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes shimmer {
  0% {
    transform: translateX(-120%);
  }
  55%,
  100% {
    transform: translateX(160%);
  }
}

@media (max-width: 720px) {
  .topbar {
    flex-direction: column;
    align-items: flex-start;
  }

  .stats {
    width: 100%;
    flex-wrap: wrap;
  }

  .main-nav {
    width: 100%;
    flex-wrap: wrap;
    justify-content: flex-start;
  }

  .nav-tools {
    width: 100%;
    justify-content: space-between;
  }

  .content {
    padding: 0 20px 24px;
  }
}