@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,400;9..144,500;9..144,700;9..144,900&family=Geist+Mono:wght@400;500&family=Geist:wght@300;400;500;600;700&display=swap');

:root {
  --cream: #f5efe4;
  --cream-deep: #ece4d3;
  --ink: #1a1815;
  --ink-soft: #3a3530;
  --coral: #ff5436;
  --coral-soft: #ff7a5c;
  --mint: #b8d8c2;
  --butter: #f5d76e;
  --lavender: #c8b8e8;
  --paper: #fefcf7;
  --shadow-ink: 0 8px 0 var(--ink);
  --shadow-ink-sm: 0 4px 0 var(--ink);
  --shadow-ink-tight: 0 2px 0 var(--ink);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Geist', system-ui, sans-serif;
  background: var(--cream);
  color: var(--ink);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  background-image: radial-gradient(circle at 1px 1px, rgba(26, 24, 21, 0.06) 1px, transparent 0);
  background-size: 24px 24px;
}

::selection {
  background: var(--coral);
  color: var(--paper);
}

h1, h2, h3 {
  font-family: 'Fraunces', Georgia, serif;
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.05;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

.container-narrow {
  max-width: 820px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--cream);
  border-bottom: 2px solid var(--ink);
  backdrop-filter: blur(10px);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  max-width: 1200px;
  margin: 0 auto;
  gap: 1rem;
}

.logo {
  font-family: 'Fraunces', Georgia, serif;
  font-weight: 900;
  font-size: 1.4rem;
  text-decoration: none;
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  letter-spacing: -0.02em;
}

.logo small {
  color: var(--ink-soft);
  font-family: 'Geist Mono', monospace;
  font-size: 0.58em;
  font-weight: 500;
  letter-spacing: 0;
  margin-left: -0.2rem;
  align-self: flex-end;
  padding-bottom: 0.1rem;
}

.logo-mark {
  display: inline-block;
  width: 32px;
  height: 32px;
  background: var(--coral);
  border: 2px solid var(--ink);
  border-radius: 10px;
  position: relative;
  flex-shrink: 0;
}

.logo-mark::before,
.logo-mark::after {
  content: "";
  position: absolute;
  background: var(--paper);
  border: 2px solid var(--ink);
}

.logo-mark::before {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  left: 5px;
  top: 5px;
}

.logo-mark::after {
  width: 14px;
  height: 4px;
  border-radius: 999px;
  right: 5px;
  bottom: 7px;
}

.nav-links {
  display: flex;
  gap: 0.25rem;
  align-items: center;
  list-style: none;
}

.nav-links a {
  color: var(--ink);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.9rem;
  padding: 0.5rem 0.85rem;
  border-radius: 999px;
  transition: background 0.2s, color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
  background: var(--ink);
  color: var(--cream);
}

.nav-toggle {
  display: none;
  background: var(--paper);
  border: 2px solid var(--ink);
  border-radius: 999px;
  padding: 0.4rem 0.9rem;
  font-family: inherit;
  font-weight: 600;
  cursor: pointer;
}

.hero {
  padding: 4rem 0 3rem;
  text-align: center;
  position: relative;
}

.hero-eyebrow,
.section-eyebrow,
.breadcrumb {
  font-family: 'Geist Mono', monospace;
  font-size: 0.8rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--coral);
  margin-bottom: 1rem;
  font-weight: 500;
}

.hero h1 {
  font-size: clamp(2.5rem, 7vw, 5.5rem);
  margin-bottom: 1.5rem;
}

.hero h1 .accent,
.accent-text {
  font-style: italic;
  color: var(--coral);
}

.hero h1 .underline {
  position: relative;
  display: inline-block;
}

.hero h1 .underline::after {
  content: "";
  position: absolute;
  left: -2%;
  right: -2%;
  bottom: 0.05em;
  height: 0.25em;
  background: var(--butter);
  z-index: -1;
  transform: skewY(-1deg);
}

.hero p,
.tool-header p {
  font-size: 1.15rem;
  color: var(--ink-soft);
  max-width: 640px;
  margin: 0 auto;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: 'Geist', sans-serif;
  font-weight: 600;
  font-size: 1rem;
  padding: 0.85rem 1.35rem;
  border: 2px solid var(--ink);
  border-radius: 999px;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.15s ease, box-shadow 0.15s ease, opacity 0.15s ease;
  background: var(--paper);
  color: var(--ink);
  box-shadow: var(--shadow-ink-sm);
}

.btn:hover {
  transform: translate(-2px, -2px);
  box-shadow: 0 6px 0 var(--ink);
}

.btn:active {
  transform: translate(0, 2px);
  box-shadow: var(--shadow-ink-tight);
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--coral);
  color: var(--paper);
}

.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1.25rem;
  margin: 3rem 0;
}

.tool-page {
  padding: 2rem 0 4rem;
}

.tool-header h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  margin-bottom: 0.75rem;
}

.tool-card {
  background: var(--paper);
  border: 2px solid var(--ink);
  border-radius: 16px;
  padding: 1.75rem;
  text-decoration: none;
  color: var(--ink);
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: var(--shadow-ink-sm);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  min-height: 205px;
}

.tool-card:hover {
  transform: translate(-3px, -3px);
  box-shadow: 0 7px 0 var(--ink);
}

.tool-card-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--ink);
  border-radius: 14px;
  font-family: 'Fraunces', serif;
  font-size: 1.35rem;
  font-weight: 900;
  flex-shrink: 0;
}

.tool-card:nth-child(1) .tool-card-icon { background: var(--coral); color: var(--paper); }
.tool-card:nth-child(2) .tool-card-icon { background: var(--butter); }
.tool-card:nth-child(3) .tool-card-icon { background: var(--mint); }
.tool-card:nth-child(4) .tool-card-icon { background: var(--lavender); }
.tool-card:nth-child(5) .tool-card-icon { background: var(--ink); color: var(--cream); }
.tool-card:nth-child(6n+6) .tool-card-icon { background: var(--coral); color: var(--paper); }
.tool-card:nth-child(6n+7) .tool-card-icon { background: var(--butter); color: var(--ink); }
.tool-card:nth-child(6n+8) .tool-card-icon { background: var(--mint); color: var(--ink); }
.tool-card:nth-child(6n+9) .tool-card-icon { background: var(--lavender); color: var(--ink); }
.tool-card:nth-child(6n+10) .tool-card-icon { background: var(--paper); color: var(--ink); }

.tool-card h3 {
  font-size: 1.5rem;
  margin: 0;
}

.tool-card p {
  color: var(--ink-soft);
  font-size: 0.95rem;
  flex-grow: 1;
}

.tool-card-arrow {
  font-family: 'Fraunces', serif;
  font-style: italic;
  font-weight: 500;
  align-self: flex-end;
  font-size: 1rem;
}

.divider-stars {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin: 3rem 0;
  font-size: 1.5rem;
  color: var(--coral);
}

.divider-stars::before,
.divider-stars::after {
  content: "";
  flex: 1;
  height: 2px;
  background: var(--ink);
  max-width: 100px;
}

.deco-star {
  display: inline-block;
  animation: spin 8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.game-section {
  scroll-margin-top: 6rem;
  margin: 5rem 0;
}

.tool-header {
  text-align: center;
  margin-bottom: 2rem;
}

.tool-header h2 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  margin-bottom: 0.75rem;
}

.tool-panel {
  background: var(--paper);
  border: 2px solid var(--ink);
  border-radius: 20px;
  padding: 1.75rem;
  box-shadow: var(--shadow-ink);
  margin-bottom: 2rem;
}

.game-panel {
  max-width: 820px;
  margin-left: auto;
  margin-right: auto;
}

.score-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.score-strip div {
  background: var(--cream);
  border: 2px solid var(--ink);
  border-radius: 14px;
  padding: 0.85rem;
  text-align: center;
  box-shadow: var(--shadow-ink-tight);
}

.score-strip span {
  display: block;
  font-family: 'Fraunces', Georgia, serif;
  font-weight: 900;
  font-size: 2rem;
  line-height: 1;
}

.score-strip small {
  display: block;
  margin-top: 0.25rem;
  font-family: 'Geist Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.status-line {
  min-height: 2.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  margin: 1rem 0;
  padding: 0.75rem 1rem;
  background: var(--ink);
  color: var(--cream);
  border-radius: 14px;
  font-family: 'Fraunces', Georgia, serif;
  font-weight: 700;
  font-size: 1.25rem;
}

.tic-board {
  width: min(100%, 390px);
  margin: 1.5rem auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  aspect-ratio: 1;
}

.tic-cell {
  border: 2px solid var(--ink);
  background: var(--cream);
  border-radius: 16px;
  box-shadow: var(--shadow-ink-tight);
  cursor: pointer;
  font-family: 'Fraunces', Georgia, serif;
  font-size: clamp(3rem, 16vw, 5rem);
  font-weight: 900;
  line-height: 1;
  color: var(--ink);
  transition: transform 0.15s, background 0.15s;
}

.tic-cell:hover {
  transform: translate(-1px, -1px);
  background: var(--butter);
}

.tic-cell.o {
  color: var(--coral);
}

.tic-cell.win {
  background: var(--mint);
}

.memory-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
  width: min(100%, 540px);
  margin: 1.5rem auto;
}

.memory-card {
  aspect-ratio: 1;
  border: 2px solid var(--ink);
  border-radius: 14px;
  background: var(--coral);
  color: transparent;
  cursor: pointer;
  box-shadow: var(--shadow-ink-tight);
  font-family: 'Fraunces', Georgia, serif;
  font-weight: 900;
  font-size: clamp(1.6rem, 7vw, 3.3rem);
  transition: transform 0.18s, background 0.18s, color 0.18s;
}

.memory-card:hover {
  transform: translate(-1px, -1px);
}

.memory-card.revealed,
.memory-card.matched {
  background: var(--butter);
  color: var(--ink);
}

.memory-card.matched {
  background: var(--mint);
}

.rps-stage {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 1rem;
  align-items: center;
  margin-bottom: 1rem;
}

.rps-pick {
  background: var(--cream);
  border: 2px solid var(--ink);
  border-radius: 18px;
  padding: 1.5rem 1rem;
  text-align: center;
  box-shadow: var(--shadow-ink-tight);
}

.rps-pick small {
  display: block;
  font-family: 'Geist Mono', monospace;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--ink-soft);
  margin-bottom: 0.5rem;
}

.rps-pick strong {
  display: block;
  font-family: 'Fraunces', Georgia, serif;
  font-size: clamp(2rem, 8vw, 4rem);
  line-height: 1;
}

.rps-versus {
  font-family: 'Fraunces', Georgia, serif;
  font-weight: 900;
  font-style: italic;
  color: var(--coral);
  font-size: 1.5rem;
}

.choice-row,
.center-controls {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  justify-content: center;
  margin: 1.25rem 0;
}

.compact-score {
  max-width: 520px;
  margin: 1.25rem auto 0;
}

.number-display {
  font-family: 'Fraunces', Georgia, serif;
  font-weight: 900;
  font-size: clamp(4.5rem, 18vw, 9rem);
  line-height: 1;
  text-align: center;
  padding: 0.5rem 0;
  color: var(--coral);
  letter-spacing: -0.04em;
}

.input-row {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  align-items: end;
}

.input-row > * {
  flex: 1;
  min-width: 0;
}

.guess-row {
  max-width: 620px;
  margin: 1.25rem auto 0;
}

input[type="number"],
input[type="text"],
textarea {
  width: 100%;
  font-family: 'Geist', sans-serif;
  font-size: 1rem;
  padding: 0.85rem 1rem;
  border: 2px solid var(--ink);
  border-radius: 12px;
  background: var(--cream);
  color: var(--ink);
}

textarea {
  min-height: 130px;
  resize: vertical;
}

input:focus,
textarea:focus {
  outline: none;
  background: var(--paper);
  box-shadow: 0 0 0 4px var(--butter);
}

.connect-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 0.5rem;
  width: min(100%, 560px);
  margin: 1.5rem auto;
  padding: 0.75rem;
  background: var(--ink);
  border: 2px solid var(--ink);
  border-radius: 18px;
  box-shadow: var(--shadow-ink-sm);
}

.connect-cell {
  aspect-ratio: 1;
  border: 2px solid var(--ink);
  border-radius: 50%;
  background: var(--cream);
  cursor: pointer;
}

.connect-cell.red { background: var(--coral); }
.connect-cell.yellow { background: var(--butter); }

.snake-grid {
  display: grid;
  grid-template-columns: repeat(15, 1fr);
  gap: 2px;
  width: min(100%, 480px);
  margin: 1.5rem auto;
  padding: 0.5rem;
  background: var(--ink);
  border: 2px solid var(--ink);
  border-radius: 16px;
  box-shadow: var(--shadow-ink-sm);
}

.snake-cell {
  aspect-ratio: 1;
  background: var(--cream);
  border-radius: 4px;
}

.snake-cell.head { background: var(--coral); }
.snake-cell.body { background: var(--mint); }
.snake-cell.food { background: var(--butter); }

.dpad {
  display: grid;
  grid-template-columns: repeat(3, 64px);
  gap: 0.5rem;
  justify-content: center;
  margin: 1rem 0;
}

.dpad .empty {
  visibility: hidden;
}

.mine-grid {
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  gap: 0.35rem;
  width: min(100%, 520px);
  margin: 1.5rem auto;
}

.mine-cell,
.letter-btn {
  border: 2px solid var(--ink);
  background: var(--cream);
  color: var(--ink);
  border-radius: 10px;
  box-shadow: var(--shadow-ink-tight);
  cursor: pointer;
  font-family: 'Geist Mono', monospace;
  font-weight: 700;
}

.mine-cell {
  aspect-ratio: 1;
  font-size: clamp(0.85rem, 3vw, 1.25rem);
}

.mine-cell.open {
  background: var(--paper);
  box-shadow: none;
}

.mine-cell.flag {
  background: var(--butter);
}

.word-display,
.hangman-word,
.typing-prompt {
  background: var(--cream);
  border: 2px solid var(--ink);
  border-radius: 18px;
  box-shadow: var(--shadow-ink-tight);
  padding: 1.5rem;
  text-align: center;
  font-family: 'Fraunces', Georgia, serif;
  font-weight: 900;
  font-size: clamp(2rem, 8vw, 4.5rem);
  letter-spacing: 0.08em;
  margin: 1.25rem 0;
  word-break: break-word;
}

.typing-prompt {
  font-size: clamp(1.3rem, 4vw, 2rem);
  letter-spacing: 0;
  line-height: 1.35;
}

.letter-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(44px, 1fr));
  gap: 0.5rem;
  margin: 1.25rem auto;
  max-width: 620px;
}

.letter-btn {
  min-height: 44px;
}

.letter-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.simon-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(110px, 170px));
  gap: 0.85rem;
  justify-content: center;
  margin: 1.5rem auto;
}

.simon-pad {
  aspect-ratio: 1;
  border: 2px solid var(--ink);
  border-radius: 22px;
  box-shadow: var(--shadow-ink-sm);
  cursor: pointer;
  transition: transform 0.15s, filter 0.15s;
}

.simon-pad.coral { background: var(--coral); }
.simon-pad.butter { background: var(--butter); }
.simon-pad.mint { background: var(--mint); }
.simon-pad.lavender { background: var(--lavender); }
.simon-pad.active {
  filter: brightness(1.25);
  transform: translate(-3px, -3px) scale(1.03);
}

.tile-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.6rem;
  width: min(100%, 430px);
  margin: 1.5rem auto;
  padding: 0.7rem;
  background: var(--ink);
  border-radius: 18px;
  border: 2px solid var(--ink);
  box-shadow: var(--shadow-ink-sm);
}

.tile {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--cream);
  border-radius: 12px;
  font-family: 'Fraunces', Georgia, serif;
  font-weight: 900;
  font-size: clamp(1.4rem, 7vw, 3rem);
}

.tile-2 { background: var(--cream); }
.tile-4 { background: var(--cream-deep); }
.tile-8, .tile-16 { background: var(--butter); }
.tile-32, .tile-64 { background: var(--coral); color: var(--paper); }
.tile-128, .tile-256, .tile-512 { background: var(--mint); }
.tile-1024, .tile-2048 { background: var(--ink); color: var(--cream); }

.math-question {
  min-height: 7rem;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  font-family: 'Fraunces', Georgia, serif;
  font-weight: 900;
  font-size: clamp(2.8rem, 10vw, 6rem);
  margin: 1rem 0;
}

.section {
  margin: 5rem 0;
}

.section h2 {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  margin-bottom: 2rem;
  max-width: 640px;
}

.use-cases {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}

.use-case {
  padding: 1.25rem;
  background: var(--paper);
  border: 2px solid var(--ink);
  border-radius: 12px;
  box-shadow: var(--shadow-ink-tight);
}

.use-case h4 {
  font-family: 'Fraunces', Georgia, serif;
  font-weight: 700;
  font-size: 1.1rem;
  margin-bottom: 0.4rem;
}

.use-case p {
  font-size: 0.9rem;
  color: var(--ink-soft);
}

.game-link {
  display: block;
  text-decoration: none;
  color: var(--ink);
  transition: transform 0.2s, box-shadow 0.2s;
}

.game-link:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-ink-sm);
}

footer {
  margin-top: 5rem;
  padding: 3rem 0 2rem;
  border-top: 2px solid var(--ink);
  background: var(--cream-deep);
}

.footer-inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 2rem;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

.footer-tagline {
  font-family: 'Fraunces', Georgia, serif;
  font-size: 1.2rem;
  font-weight: 500;
  font-style: italic;
  color: var(--ink-soft);
  max-width: 340px;
}

.footer-inner h4 {
  font-family: 'Geist Mono', monospace;
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

.footer-inner ul {
  list-style: none;
}

.footer-inner li {
  margin-bottom: 0.5rem;
}

.footer-inner a {
  color: var(--ink);
  text-decoration: none;
  font-size: 0.95rem;
}

.footer-inner a:hover {
  color: var(--coral);
}

.footer-bottom {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--ink);
  text-align: center;
  font-size: 0.85rem;
  color: var(--ink-soft);
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

.pop-in {
  animation: popIn 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes popIn {
  0% { transform: scale(0.6); opacity: 0; }
  100% { transform: scale(1); opacity: 1; }
}

@media (max-width: 820px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--cream);
    border-bottom: 2px solid var(--ink);
    flex-direction: column;
    padding: 1rem;
    gap: 0.25rem;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    width: 100%;
    text-align: left;
  }

  .nav-toggle {
    display: block;
  }

  .footer-inner {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  .hero {
    padding: 2.5rem 0 2rem;
  }

  .tool-panel {
    padding: 1.25rem;
  }

  .score-strip,
  .rps-stage {
    grid-template-columns: 1fr;
  }

  .rps-versus {
    text-align: center;
  }

  .choice-row .btn,
  .controls-row .btn,
  .guess-row .btn {
    width: 100%;
  }

  .memory-grid {
    gap: 0.5rem;
  }

  .tic-board {
    gap: 0.5rem;
  }
}