:root {
  --ink: #1b1a16;
  --bg: #f4efe7;
  --surface: rgba(255, 255, 255, 0.8);
  --surface-strong: rgba(255, 255, 255, 0.95);
  --muted: rgba(27, 26, 22, 0.6);
  --shadow: rgba(27, 26, 22, 0.18);
  --accent: #ff7a40;
  --accent-2: #2cb9a9;
  --accent-3: #f5c84a;
  --accent-4: #4c7dff;
  --accent-5: #f06f9d;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: "Sora", "Trebuchet MS", sans-serif;
  color: var(--ink);
  min-height: 100vh;
  background:
    radial-gradient(circle at 8% 12%, rgba(255, 122, 64, 0.28), transparent 45%),
    radial-gradient(circle at 86% 18%, rgba(76, 125, 255, 0.25), transparent 40%),
    radial-gradient(circle at 60% 90%, rgba(44, 185, 169, 0.2), transparent 50%),
    var(--bg);
}

.sky {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
}

.blob {
  position: absolute;
  border-radius: 999px;
  opacity: 0.5;
  filter: blur(0.5px);
  mix-blend-mode: multiply;
  animation: float 16s ease-in-out infinite;
}

.blob-1 {
  width: 300px;
  height: 300px;
  background: rgba(255, 122, 64, 0.45);
  top: -80px;
  left: -60px;
}

.blob-2 {
  width: 260px;
  height: 260px;
  background: rgba(44, 185, 169, 0.45);
  bottom: -90px;
  right: 10%;
  animation-delay: -4s;
}

.blob-3 {
  width: 220px;
  height: 220px;
  background: rgba(245, 200, 74, 0.5);
  top: 12%;
  right: -70px;
  animation-delay: -8s;
}

.grid-lines {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(90deg, rgba(27, 26, 22, 0.04) 1px, transparent 1px),
    linear-gradient(0deg, rgba(27, 26, 22, 0.04) 1px, transparent 1px);
  background-size: 120px 120px;
  opacity: 0.4;
}

.page {
  position: relative;
  z-index: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: 2.6rem 6vw 3rem;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  text-decoration: none;
  color: var(--ink);
  font-weight: 600;
  background: var(--surface-strong);
  padding: 0.4rem 0.8rem;
  border-radius: 999px;
  box-shadow: 0 10px 20px var(--shadow);
  border: 1px solid rgba(27, 26, 22, 0.08);
}

.hero {
  margin-top: 1.4rem;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.28rem;
  font-size: 0.75rem;
  color: var(--muted);
}

h1,
h2,
h3,
h4 {
  font-family: "Changa One", "Trebuchet MS", sans-serif;
}

h1 {
  font-size: clamp(2.4rem, 3vw + 1rem, 3.2rem);
  margin-top: 0.6rem;
}

.subtitle {
  margin-top: 0.6rem;
  max-width: 620px;
  color: var(--muted);
  line-height: 1.5;
}

.hero-meta {
  margin-top: 1.4rem;
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.meta-card {
  background: var(--surface-strong);
  border-radius: 14px;
  padding: 0.65rem 0.9rem;
  box-shadow: 0 10px 20px var(--shadow);
  border: 1px solid rgba(27, 26, 22, 0.08);
  min-width: 130px;
}

.meta-label {
  display: block;
  font-size: 0.75rem;
  color: var(--muted);
}

.meta-value {
  font-weight: 600;
  font-size: 1.05rem;
}

.layout {
  margin-top: 2.2rem;
  display: grid;
  grid-template-columns: minmax(220px, 280px) minmax(0, 1fr);
  gap: 1.6rem;
  align-items: start;
}

.game-menu {
  background: var(--surface);
  border-radius: 20px;
  padding: 1.2rem;
  box-shadow: 0 20px 40px var(--shadow);
  border: 1px solid rgba(27, 26, 22, 0.08);
  display: grid;
  gap: 0.9rem;
}

.menu-header p {
  color: var(--muted);
  font-size: 0.9rem;
  margin-top: 0.4rem;
}

.game-list {
  display: grid;
  gap: 0.8rem;
}

.game-card {
  border: none;
  background: var(--surface-strong);
  padding: 0.75rem 0.85rem;
  border-radius: 14px;
  cursor: pointer;
  display: grid;
  gap: 0.2rem;
  text-align: left;
  box-shadow: 0 12px 18px rgba(27, 26, 22, 0.08);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.game-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 26px rgba(27, 26, 22, 0.12);
}

.game-card.is-active {
  border: 2px solid var(--accent);
  background: #fff3ed;
}

.card-title {
  font-weight: 700;
}

.card-subtitle {
  font-size: 0.85rem;
  color: var(--muted);
}

.card-tag {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.12rem;
  color: var(--accent-4);
}

.game-stage {
  display: grid;
  gap: 1.4rem;
}

.game-panel {
  background: var(--surface);
  border-radius: 20px;
  padding: 1.4rem;
  box-shadow: 0 24px 40px var(--shadow);
  border: 1px solid rgba(27, 26, 22, 0.08);
  display: none;
}

.game-panel.is-active {
  display: block;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  flex-wrap: wrap;
}

.panel-header p {
  color: var(--muted);
  margin-top: 0.3rem;
}

.panel-note {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.12rem;
  color: var(--accent-2);
}

.ghost-link {
  text-decoration: none;
  color: var(--ink);
  font-weight: 600;
  padding: 0.4rem 0.7rem;
  border-radius: 999px;
  border: 1px solid rgba(27, 26, 22, 0.15);
  background: rgba(255, 255, 255, 0.8);
}

.iframe-wrap {
  margin-top: 1.2rem;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid rgba(27, 26, 22, 0.1);
  background: #000;
}

.iframe-wrap iframe {
  width: 100%;
  height: 620px;
  border: none;
  display: block;
}

.mini-game {
  margin-top: 1.2rem;
  background: var(--surface-strong);
  border-radius: 18px;
  padding: 1.2rem;
  display: grid;
  gap: 1rem;
  border: 1px solid rgba(27, 26, 22, 0.08);
}

.game-header {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  flex-wrap: wrap;
}

.game-header h4 {
  margin-bottom: 0.35rem;
}

.muted {
  color: var(--muted);
  font-size: 0.9rem;
}

.game-stats {
  display: grid;
  gap: 0.2rem;
  font-size: 0.85rem;
  color: var(--muted);
}

.word-card,
.fraction-stage,
.pattern-stage {
  background: #fff;
  border-radius: 16px;
  padding: 1.2rem;
  border: 1px solid rgba(27, 26, 22, 0.08);
  box-shadow: inset 0 0 0 1px rgba(27, 26, 22, 0.03);
}

.word-prompt {
  font-size: 2rem;
  letter-spacing: 0.4rem;
  text-align: center;
  font-weight: 600;
}

.word-hint {
  margin-top: 0.5rem;
  color: var(--muted);
  text-align: center;
}

.options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 0.7rem;
}

.option-button {
  border: none;
  border-radius: 12px;
  padding: 0.65rem 0.8rem;
  background: #fff;
  cursor: pointer;
  font-weight: 600;
  box-shadow: 0 8px 18px rgba(27, 26, 22, 0.08);
  border: 1px solid rgba(27, 26, 22, 0.1);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.option-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 24px rgba(27, 26, 22, 0.12);
}

.option-button.is-correct {
  background: rgba(44, 185, 169, 0.2);
  border-color: rgba(44, 185, 169, 0.6);
}

.option-button.is-wrong {
  background: rgba(240, 111, 157, 0.2);
  border-color: rgba(240, 111, 157, 0.6);
}

.feedback {
  min-height: 1.5rem;
  font-weight: 600;
}

.ghost {
  justify-self: start;
  border: 1px solid rgba(27, 26, 22, 0.2);
  background: transparent;
  padding: 0.5rem 0.9rem;
  border-radius: 999px;
  font-weight: 600;
  cursor: pointer;
}

.fraction-stage {
  display: grid;
  gap: 0.8rem;
  justify-items: center;
}

.fraction-plate {
  --fill: 50%;
  width: min(240px, 70vw);
  aspect-ratio: 1;
  border-radius: 50%;
  background: conic-gradient(
    var(--accent-2) 0 var(--fill),
    rgba(27, 26, 22, 0.08) var(--fill) 100%
  );
  border: 8px solid #fff;
  box-shadow: 0 14px 30px rgba(27, 26, 22, 0.18);
}

.fraction-caption {
  font-weight: 600;
}

.pattern-stage {
  display: grid;
  place-items: center;
}

.pattern-sequence {
  display: grid;
  grid-template-columns: repeat(4, minmax(60px, 1fr));
  gap: 0.8rem;
  width: 100%;
}

.pattern-token {
  width: 60px;
  height: 60px;
  background: var(--token-color);
  border-radius: 16px;
  border: 2px solid rgba(27, 26, 22, 0.1);
  margin: 0 auto;
}

.pattern-token.shape-circle {
  border-radius: 50%;
}

.pattern-token.shape-triangle {
  border-radius: 0;
  clip-path: polygon(50% 0%, 0% 100%, 100% 100%);
}

.pattern-token.placeholder {
  background: repeating-linear-gradient(
    135deg,
    rgba(27, 26, 22, 0.05),
    rgba(27, 26, 22, 0.05) 8px,
    rgba(27, 26, 22, 0.12) 8px,
    rgba(27, 26, 22, 0.12) 16px
  );
}

.option-token {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.footer {
  margin-top: 2.8rem;
  color: var(--muted);
}

.reveal {
  opacity: 0;
  transform: translateY(16px);
  animation: fadeUp 0.7s ease forwards;
  animation-delay: calc(var(--delay) * 0.15s);
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(16px);
  }
}

@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .iframe-wrap iframe {
    height: 520px;
  }
}

@media (max-width: 600px) {
  .page {
    padding: 2rem 5vw 2.4rem;
  }

  .game-list {
    grid-auto-flow: column;
    grid-auto-columns: minmax(200px, 1fr);
    overflow-x: auto;
    padding-bottom: 0.2rem;
  }

  .pattern-sequence {
    grid-template-columns: repeat(4, 1fr);
  }

  .pattern-token {
    width: 50px;
    height: 50px;
  }
}