:root {
  --bg: #17142f;
  --surface: #211d3d;
  --surface-raised: #2a254d;
  --node: #312c58;
  --edge: #332e55;
  --text: #fffaf2;
  --muted: #aaa5c3;
  --green: #58e6bd;
  --green-dark: #173f43;
  --red: #ff6f7d;
  --amber: #ffc857;
  --cyan: #5bc7ff;
  --border: rgba(255, 255, 255, 0.11);
  --shadow: 0 18px 50px rgba(7, 5, 25, 0.25);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: "Nunito", ui-rounded, "SF Pro Rounded", "Segoe UI", sans-serif;
  user-select: none;
  -webkit-user-select: none;
}

.app { max-width: 1020px; margin: 0 auto; padding: 24px; }

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  margin-bottom: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--text);
  text-decoration: none;
}
.brand-mark {
  width: 48px;
  height: 48px;
  border-radius: 13px;
  box-shadow: 0 8px 24px rgba(255, 111, 125, 0.2);
  transition: transform 0.2s ease;
}
.brand:hover .brand-mark { transform: rotate(-4deg) scale(1.04); }
.brand-copy { display: flex; flex-direction: column; }
.brand-name {
  font-family: ui-rounded, "SF Pro Rounded", "Arial Rounded MT Bold", sans-serif;
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.6px;
  line-height: 1.05;
}
.brand-tagline {
  margin-top: 3px;
  color: var(--amber);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 1.35px;
  text-transform: uppercase;
}

.site-nav { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.site-nav a {
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  padding: 9px 12px;
  border-radius: 999px;
  transition: color 0.15s ease, background 0.15s ease;
}
.site-nav a:hover { color: var(--text); background: rgba(255, 255, 255, 0.07); }
.site-nav a.nav-primary {
  color: #211932;
  background: var(--amber);
}
.site-nav a.nav-primary:hover { background: #ffd473; }

.puzzle-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 32px;
  margin: 10px 0 16px;
}
.game-controls {
  display: flex;
  align-items: flex-end;
  gap: 20px;
  flex-shrink: 0;
}
.control-group { display: flex; flex-direction: column; gap: 7px; }
.control-label {
  color: var(--muted);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 1.2px;
  text-transform: uppercase;
}
.puzzle-actions { display: flex; gap: 8px; }

#puzzle-label {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  min-height: 28px;
  padding-bottom: 7px;
  color: var(--muted);
}
.puzzle-context {
  color: var(--text);
  font-family: ui-rounded, "SF Pro Rounded", "Arial Rounded MT Bold", sans-serif;
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.3px;
}
.puzzle-context.daily { color: #e7b85c; }
.puzzle-context.random { color: var(--cyan); }
.puzzle-meta { font-size: 13px; }

.solved-badge {
  padding: 4px 8px;
  color: var(--green);
  background: var(--green-dark);
  border-radius: 999px;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.2px;
}

/* segmented difficulty picker */
.seg {
  display: inline-flex;
  gap: 3px;
  padding: 3px;
  background: rgba(9, 7, 27, 0.35);
  border-radius: 11px;
}
.seg button {
  border: none;
  border-radius: 8px;
  background: transparent;
  color: var(--muted);
  padding: 8px 12px;
}
.seg button.active {
  background: var(--green);
  color: #152b2d;
  font-weight: 800;
  box-shadow: 0 4px 14px rgba(88, 230, 189, 0.22);
}

button {
  font-family: inherit;
  font-weight: 700;
  background: var(--surface-raised);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 14px;
  font-size: 14px;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}
button:hover { background: #383260; border-color: rgba(255,255,255,0.2); transform: translateY(-1px); }
button:disabled { cursor: wait; opacity: 0.8; }
#today-puzzle { color: var(--amber); }
#today-puzzle.active { color: #211932; background: var(--amber); border-color: transparent; }
#today-puzzle.active:hover { background: #ffd474; }
#new-puzzle { color: var(--cyan); }
#new-puzzle.active { color: #102a38; background: var(--cyan); border-color: transparent; }
#new-puzzle.active:hover { background: #83d7ff; }
.button-icon {
  display: inline-block;
  margin-right: 3px;
  font-size: 17px;
  line-height: 0;
  vertical-align: -1px;
}
#new-puzzle.loading .button-icon { animation: button-spin 0.7s linear infinite; }

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

main { display: flex; gap: 30px; flex-wrap: wrap; }

.board-wrap {
  position: relative;
  flex: 1 1 380px;
  min-width: 320px;
  padding-top: 12px;
}

.board-top {
  position: absolute;
  z-index: 2;
  top: -14px;
  right: 0;
  left: 0;
  height: 52px;
  text-align: center;
  pointer-events: none;
}

#current-word {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 3px;
  height: 30px;
  color: var(--green);
}
#current-word.err { color: var(--red); animation: shake-x 0.45s ease; }
#current-word.warn { color: var(--amber); animation: soft-pulse 0.5s ease; }

#feedback-label {
  height: 18px;
  font-size: 13px;
  letter-spacing: 1px;
  color: var(--muted);
  opacity: 0;
  transition: opacity 0.25s;
}
#feedback-label.show { opacity: 1; }
#feedback-label.err { color: var(--red); }
#feedback-label.warn { color: var(--amber); }
#feedback-label.bonus { color: var(--cyan); }

.fly-letter {
  position: fixed;
  z-index: 20;
  transform: translate(-50%, -50%);
  font-size: 24px;
  font-weight: 700;
  pointer-events: none;
}

#board {
  width: 100%;
  max-width: 520px;
  display: block;
  margin: 0 auto;
  touch-action: none;
}

.panel {
  flex: 1 1 260px;
  min-width: 240px;
  align-self: flex-start;
  margin-top: 42px;
  padding: 12px 0;
}

#status { color: var(--muted); font-size: 14px; margin-bottom: 12px; }

#words { display: flex; flex-wrap: wrap; gap: 8px; }

.chip {
  padding: 5px 10px;
  border-radius: 999px;
  background: var(--node);
  color: var(--muted);
  font-size: 13px;
  letter-spacing: 1px;
  min-width: 34px;
  text-align: center;
}
.chip.found { background: var(--green-dark); color: var(--green); font-weight: 600; }

#bonus-line { margin-top: 16px; color: var(--muted); font-size: 13px; }

/* SVG board */
.edge {
  stroke: var(--edge);
  stroke-width: 16;
  stroke-linecap: round;
  transition: opacity 0.4s;
}
.traceline {
  stroke: var(--green);
  stroke-width: 16;
  stroke-linecap: round;
  pointer-events: none;
  transition: opacity 0.45s, stroke 0.15s;
}
.traceline.bad { stroke: var(--red); }
.traceline.dupline { stroke: var(--amber); }
.traceline.bonusline { stroke: var(--cyan); }
.traceline.fadeout { opacity: 0; }
.cell circle {
  fill: var(--node);
  transition: fill 0.15s, opacity 0.4s;
}
.cell text {
  fill: var(--text);
  font-size: 34px;
  font-weight: 700;
  text-anchor: middle;
  dominant-baseline: central;
  pointer-events: none;
  transition: fill 0.15s, opacity 0.4s;
}
.cell.selected circle { fill: var(--green); }
.cell.selected text { fill: #10281a; }
.cell.removed, .edge.removed { opacity: 0; pointer-events: none; }

/* result animations */
.cell { transform-box: fill-box; transform-origin: center; }
.cell.pop, .cell.bonus-pop, .cell.dup { animation: cell-pop 0.5s ease; }
.cell.pop circle { fill: var(--green); }
.cell.bonus-pop circle { fill: var(--cyan); }
.cell.dup circle { fill: var(--amber); }
.cell.pop text, .cell.bonus-pop text, .cell.dup text { fill: #10281a; }
.cell.wiggle { animation: cell-shake 0.45s ease; }
.cell.wiggle circle { fill: var(--red); }
.cell.wiggle text { fill: #2b1114; }

@keyframes cell-pop {
  0% { transform: scale(1); }
  40% { transform: scale(1.25); }
  100% { transform: scale(1); }
}
@keyframes cell-shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-7px); }
  40% { transform: translateX(7px); }
  60% { transform: translateX(-5px); }
  80% { transform: translateX(4px); }
}
@keyframes shake-x {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-8px); }
  40% { transform: translateX(8px); }
  60% { transform: translateX(-5px); }
  80% { transform: translateX(4px); }
}
@keyframes soft-pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.12); }
}

#overlay {
  position: fixed;
  inset: 0;
  background: rgba(8, 6, 25, 0.78);
  backdrop-filter: blur(5px);
  display: flex;
  align-items: center;
  justify-content: center;
}
#overlay.hidden { display: none; }
.overlay-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 32px 48px;
  text-align: center;
  box-shadow: var(--shadow);
}
.overlay-card h2 { margin: 0 0 8px; color: var(--green); }
.overlay-card p { color: var(--muted); margin: 0 0 20px; }

/* ---- how to play (howto.html) ---- */

.howto { align-items: flex-start; }

.howto-steps {
  flex: 1 1 300px;
  min-width: 280px;
  max-width: 430px;
  padding: 10px 0;
}
.eyebrow {
  display: block;
  color: var(--red);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 1.5px;
  text-transform: uppercase;
}
.howto-steps h2, .page-heading h2 {
  margin: 5px 0 16px;
  font-family: ui-rounded, "SF Pro Rounded", "Arial Rounded MT Bold", sans-serif;
  font-size: 30px;
  letter-spacing: -0.7px;
}
.howto-steps ol { margin: 0; padding-left: 22px; }
.howto-steps li {
  margin-bottom: 14px;
  line-height: 1.5;
  color: var(--muted);
  font-size: 15px;
}
.howto-steps li strong { color: var(--text); }
.howto-steps li em { color: var(--text); font-style: normal; font-weight: 600; }

.cta {
  display: inline-block;
  margin-top: 10px;
  background: var(--green);
  color: #152b2d;
  font-weight: 800;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: 11px;
  padding: 10px 18px;
}
.cta:hover { background: #7bf0cf; }

.howto-demo { flex: 1 1 340px; min-width: 300px; }

#demo-word {
  height: 30px;
  text-align: center;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 3px;
  color: var(--green);
}
#demo-word.hit { animation: soft-pulse 0.5s ease; }

.demo-board-wrap { position: relative; max-width: 440px; margin: 0 auto; }
#demo-board { width: 100%; display: block; }

#demo-hand {
  position: absolute;
  left: 0;
  top: 0;
  z-index: 5;
  pointer-events: none;
  font-size: 46px;
  /* the fingertip of the emoji sits near its top-centre; nudge so it
     lands on the cell centre */
  transform: translate(-42%, -12%);
  transition: left 0.32s ease-in-out, top 0.32s ease-in-out, opacity 0.5s;
  filter: drop-shadow(0 4px 10px rgba(0, 0, 0, 0.55));
}
.hand-inner {
  display: inline-block;
  transition: transform 0.2s ease;
  transform-origin: 50% 15%;
}
#demo-hand.pressing .hand-inner { transform: scale(0.82) translateY(4px); }

#demo-caption {
  min-height: 22px;
  margin: 12px 0 14px;
  text-align: center;
  color: var(--muted);
  font-size: 14px;
  transition: opacity 0.3s;
}

#demo-words {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  max-width: 440px;
  margin: 0 auto;
}

/* ---- browse page (puzzles.html) ---- */

.page-heading { margin: 34px 0 20px; }

.browse-controls {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin: 8px 0 24px;
}
.toggle { color: var(--muted); font-size: 14px; cursor: pointer; }
.toggle input { accent-color: var(--green); }
#browse-stats { color: var(--muted); font-size: 14px; margin-left: auto; }

#today-row h2 {
  font-size: 12px;
  margin: 0 0 10px;
  color: var(--amber);
  letter-spacing: 1.2px;
  text-transform: uppercase;
}
.today-cards { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 24px; }
.today-slot { display: flex; flex-direction: column; gap: 4px; }
.today-diff { color: var(--muted); font-size: 12px; letter-spacing: 1px; text-transform: uppercase; }
.today-card { min-width: 150px; }

#puzzle-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 8px;
}

.puzzle-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 2px;
  background: rgba(42, 37, 77, 0.84);
  border: 1px solid var(--border);
  border-radius: 13px;
  padding: 13px 14px;
  text-decoration: none;
  border-left-width: 3px;
  transition: transform 0.15s ease, background 0.15s ease;
}
.puzzle-card:hover { background: #383260; transform: translateY(-2px); }
.puzzle-card.easy { border-left-color: var(--green); }
.puzzle-card.medium { border-left-color: var(--amber); }
.puzzle-card.hard { border-left-color: var(--red); }
.puzzle-card.solved { opacity: 0.55; }
.pc-id { color: var(--text); font-weight: 600; font-size: 14px; }
.pc-meta { color: var(--muted); font-size: 12px; }
.pc-check {
  position: absolute;
  top: 8px;
  right: 10px;
  color: var(--green);
  font-weight: 700;
}

@media (max-width: 720px) {
  .app { padding: 16px; }
  .site-header { align-items: flex-start; margin-bottom: 18px; }
  .brand-mark { width: 42px; height: 42px; }
  .brand-name { font-size: 21px; }
  .brand-tagline { font-size: 9px; }
  .site-nav { justify-content: flex-end; gap: 2px; }
  .site-nav a { padding: 8px; font-size: 13px; }
  .puzzle-toolbar { align-items: stretch; flex-direction: column; gap: 12px; }
  .game-controls { align-items: stretch; flex-direction: column; gap: 12px; }
  #puzzle-label { padding-bottom: 0; }
  .control-group { width: 100%; }
  .seg, .puzzle-actions { display: flex; }
  .seg button, .puzzle-actions button { flex: 1; }
  .board-wrap { min-width: 0; flex-basis: 100%; }
  .panel { min-width: 0; margin-top: 0; width: 100%; }
  .howto-steps, .howto-demo { min-width: 0; max-width: none; flex-basis: 100%; }
  #browse-stats { width: 100%; margin-left: 0; }
}

@media (max-width: 460px) {
  .site-header { flex-direction: column; }
  .site-nav { width: 100%; justify-content: flex-start; }
  .brand-mark { width: 40px; height: 40px; }
  .board-top { height: 46px; }
  #puzzle-label { align-items: flex-start; flex-direction: column; gap: 2px; }
  .overlay-card { width: calc(100% - 32px); padding: 28px 20px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}