:root {
  color: #edf2df;
  background: #090d09;
  font-family: "SFMono-Regular", "Cascadia Mono", "Roboto Mono", ui-monospace, monospace;
  --phosphor: #a4ff68;
  --amber: #ffb454;
  --ink: #090d09;
  --screen: #101a12;
  --screen-raised: #172219;
  --line: rgba(164,255,104,.19);
  --muted: #81907e;
  --cell: min(48px, calc((100vw - 68px) / 7));
}

* { box-sizing: border-box; }
html { color-scheme: dark; }
body {
  min-width: 320px;
  margin: 0;
  background:
    linear-gradient(rgba(164,255,104,.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(164,255,104,.025) 1px, transparent 1px),
    radial-gradient(circle at 80% 8%, rgba(255,180,84,.08), transparent 24rem),
    #090d09;
  background-size: 28px 28px, 28px 28px, auto, auto;
}

button, a { -webkit-tap-highlight-color: transparent; }
button { font: inherit; }
main { width: min(1080px, calc(100% - 32px)); margin: 0 auto; }
nav {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: .68rem;
  letter-spacing: .09em;
  text-transform: uppercase;
}
nav > span {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  pointer-events: none;
}
nav > .brand { margin-right: auto; }
nav > .leaderboard-link { margin-left: auto; }
.brand { display: inline-flex; align-items: center; gap: 9px; color: #edf2df; font-family: ui-rounded, system-ui, sans-serif; font-size: .86rem; font-weight: 800; letter-spacing: -.025em; text-decoration: none; text-transform: none; }
.brand img { border-radius: 9px; }

.game-hero { display: grid; grid-template-columns: 1.1fr .9fr; align-items: end; gap: 50px; padding: 70px 0 52px; }
.eyebrow { margin: 0 0 14px; color: var(--phosphor); font-size: .66rem; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; }
h1, h2 { margin: 0; font-family: "Arial Black", Impact, ui-sans-serif, sans-serif; font-weight: 900; letter-spacing: -.07em; text-transform: uppercase; }
h1 { font-size: clamp(4rem, 9vw, 7rem); line-height: .77; }
h1 em { color: var(--amber); font-style: normal; -webkit-text-stroke: 1px rgba(255,180,84,.25); }
.game-hero > p { max-width: 440px; margin: 0 0 2px; color: #a7b0a1; font-family: ui-sans-serif, system-ui, sans-serif; font-size: 1.02rem; line-height: 1.7; }

.play-layout { display: grid; grid-template-columns: minmax(390px, 500px) 1fr; align-items: center; gap: clamp(38px, 7vw, 90px); }
.console {
  position: relative;
  overflow: hidden;
  padding: 18px;
  border: 1px solid rgba(164,255,104,.28);
  border-radius: 25px;
  background: linear-gradient(145deg, rgba(255,255,255,.035), transparent), #111812;
  box-shadow: 0 34px 100px rgba(0,0,0,.52), inset 0 0 0 5px rgba(0,0,0,.22);
}
.console::after {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: repeating-linear-gradient(to bottom, transparent 0 3px, rgba(0,0,0,.055) 3px 4px);
  content: "";
  pointer-events: none;
}
.console > * { position: relative; z-index: 1; }
.console-top { display: grid; grid-template-columns: 1.2fr 1.2fr .7fr; gap: 10px; }
.console-top > div { padding: 10px 12px; border: 1px solid var(--line); border-radius: 11px; background: #0c120d; }
.console-top small, .console-top strong { display: block; }
.console-top small { margin-bottom: 4px; color: var(--muted); font-size: .55rem; letter-spacing: .12em; text-transform: uppercase; }
.console-top strong { color: var(--phosphor); font-size: 1rem; letter-spacing: .08em; }
.console-top > div:last-child strong { color: var(--amber); }

.signal-message { min-height: 39px; padding: 13px 5px 8px; color: #8ba687; font-size: .68rem; text-align: center; }
.rule-line {
  margin: -3px 0 8px;
  color: #637260;
  font-size: .56rem;
  line-height: 1.35;
  text-align: center;
}
.display { position: relative; width: calc(var(--cell) * 7 + 28px); margin: 0 auto; }
.column-clues { display: grid; grid-template-columns: repeat(7, var(--cell)); width: calc(var(--cell) * 7); height: 25px; }
.row-clues { display: grid; grid-template-rows: repeat(8, var(--cell)); width: 28px; }
.column-clues span, .row-clues span { display: grid; place-items: center; color: var(--amber); font-size: .67rem; font-weight: 850; }
.column-clues span::before, .row-clues span::before { color: #536151; content: "·"; }
.column-clues span { grid-template-rows: 7px 1fr; }
.row-clues span { grid-template-columns: 7px 1fr; }
.board-row { display: flex; }
.board {
  display: grid;
  grid-template-columns: repeat(7, var(--cell));
  grid-template-rows: repeat(8, var(--cell));
  width: calc(var(--cell) * 7);
  height: calc(var(--cell) * 8);
  overflow: hidden;
  border: 1px solid rgba(164,255,104,.31);
  border-radius: 12px;
  background: var(--screen);
  box-shadow: inset 0 0 28px rgba(164,255,104,.045);
}
.cell {
  position: relative;
  min-width: 0;
  padding: 0;
  border: 0;
  border-right: 1px solid rgba(164,255,104,.085);
  border-bottom: 1px solid rgba(164,255,104,.085);
  background: transparent;
  cursor: pointer;
  touch-action: manipulation;
}
.cell::after { position: absolute; inset: 5px; border: 1px solid rgba(164,255,104,.07); border-radius: 6px; content: ""; }
.cell.tone-light::after { border-color: #c5ff9f; background: var(--phosphor); box-shadow: 0 0 11px rgba(164,255,104,.32), inset 0 0 0 2px rgba(255,255,255,.18); }
.cell.tone-dark::after { border-color: #ffd19b; background: var(--amber); box-shadow: 0 0 9px rgba(255,180,84,.2), inset 0 0 0 2px rgba(255,255,255,.12); }
.cell.preview-valid::after { border-color: rgba(237,242,223,.9); background: rgba(164,255,104,.22); box-shadow: inset 0 0 0 2px var(--phosphor); }
.cell.preview-invalid::after { border-color: #ff677d; background: rgba(255,103,125,.15); }
.board.is-rejected { animation: board-reject .32s ease; }
.cell:focus-visible { z-index: 2; outline: 2px solid #fff; outline-offset: -4px; }

.signal-flash {
  position: absolute;
  z-index: 5;
  top: 42%;
  left: 50%;
  padding: 9px 14px;
  border: 1px solid var(--phosphor);
  border-radius: 999px;
  background: rgba(9,13,9,.94);
  color: var(--phosphor);
  font-size: .68rem;
  font-weight: 900;
  letter-spacing: .09em;
  text-transform: uppercase;
  transform: translate(-50%, -50%);
  animation: signal-pop .25s ease-out;
  pointer-events: none;
}
.signal-flash[hidden] { display: none; }
@keyframes signal-pop { from { opacity: 0; transform: translate(-50%, -42%) scale(.9); } }
@keyframes board-reject {
  35% { border-color: #ff677d; box-shadow: inset 0 0 28px rgba(255,103,125,.14); }
}

.tray-head { display: flex; align-items: center; justify-content: space-between; padding: 15px 3px 8px; color: var(--muted); font-size: .59rem; letter-spacing: .11em; text-transform: uppercase; }
.tray-head button, .console-bottom button { min-height: 34px; border: 1px solid var(--line); border-radius: 8px; background: #0c120d; color: #dce9d3; cursor: pointer; font-size: .63rem; font-weight: 800; }
.tray-head button { padding: 0 11px; }
.tray-head button:disabled { cursor: default; opacity: .35; }
.piece-tray { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; min-height: 90px; }
.piece {
  position: relative;
  min-width: 0;
  min-height: 88px;
  padding: 0;
  border: 1px solid rgba(164,255,104,.11);
  border-radius: 12px;
  background: #0c120d;
  cursor: pointer;
  touch-action: manipulation;
}
.piece::before { position: absolute; inset: 6px; border: 1px dashed rgba(164,255,104,.07); border-radius: 8px; content: ""; }
.piece.selected { border-color: var(--phosphor); background: rgba(164,255,104,.07); box-shadow: 0 0 0 2px rgba(164,255,104,.08), inset 0 0 18px rgba(164,255,104,.06); }
.piece:focus-visible { outline: 2px solid #fff; outline-offset: 2px; }
.piece-cell { position: absolute; top: 50%; left: 50%; width: 22px; height: 22px; border: 2px solid #0c120d; border-radius: 5px; transform: translate(calc(-50% + var(--dx)), calc(-50% + var(--dy))); }
.piece-cell.light { background: var(--phosphor); box-shadow: inset 0 0 0 1px #d8ffbd; }
.piece-cell.dark { background: var(--amber); box-shadow: inset 0 0 0 1px #ffdbaf; }

.console-bottom { display: flex; align-items: center; gap: 12px; padding: 13px 3px 2px; color: #778275; font-size: .58rem; text-transform: uppercase; }
.console-bottom span { display: inline-flex; align-items: center; gap: 5px; }
.console-bottom button { margin-left: auto; padding: 0 10px; }
.lamp { display: inline-block; width: 8px; height: 8px; border-radius: 2px; }.lamp-light { background: var(--phosphor); }.lamp-dark { background: var(--amber); }

.game-over {
  position: absolute;
  z-index: 10;
  inset: 25px 28px 0 0;
  display: grid;
  place-content: center;
  justify-items: center;
  padding: 24px;
  border: 1px solid rgba(255,180,84,.72);
  border-radius: 12px;
  background: radial-gradient(circle at 50% 35%, rgba(255,180,84,.1), transparent 12rem), rgba(9,13,9,.965);
  box-shadow: 0 24px 70px rgba(0,0,0,.7);
  text-align: center;
}
.game-over[hidden] { display: none; }
.game-over > span { color: var(--amber); font-size: .57rem; letter-spacing: .16em; }
.game-over h2 { margin-top: 14px; font-size: clamp(2rem, 8vw, 3.7rem); line-height: .9; }
.game-over > strong { margin-top: 18px; color: var(--phosphor); font-size: 1.55rem; letter-spacing: .08em; }
.game-over > p { margin: 8px 0 20px; color: var(--amber); font-size: .68rem; font-weight: 850; letter-spacing: .1em; text-transform: uppercase; }
.game-over > div { display: flex; gap: 8px; }
.game-over button { min-height: 40px; padding: 0 13px; border: 1px solid var(--phosphor); border-radius: 8px; background: var(--phosphor); color: #091009; cursor: pointer; font-size: .68rem; font-weight: 900; }
.game-over button + button { border-color: rgba(255,180,84,.65); background: transparent; color: var(--amber); }
.game-over small { min-height: 18px; margin-top: 12px; color: #91a28c; font-size: .62rem; }

aside { max-width: 440px; }
aside h2 { font-size: clamp(2.55rem, 5vw, 4.4rem); line-height: .88; }
aside ol { display: grid; gap: 13px; margin: 30px 0 0; padding: 0; counter-reset: steps; list-style: none; }
aside li { position: relative; padding: 0 0 0 42px; color: #9ca898; font-family: ui-sans-serif, system-ui, sans-serif; line-height: 1.55; counter-increment: steps; }
aside li::before { position: absolute; top: 0; left: 0; display: grid; place-items: center; width: 27px; height: 27px; border: 1px solid var(--line); border-radius: 50%; color: var(--phosphor); content: counter(steps, decimal-leading-zero); font-family: ui-monospace, monospace; font-size: .58rem; }
aside strong { color: #eef4e8; }
.privacy { margin: 30px 0 0; padding-top: 20px; border-top: 1px solid var(--line); color: #6f7a6c; font-family: ui-sans-serif, system-ui, sans-serif; font-size: .77rem; line-height: 1.65; }
footer { max-width: 650px; padding: 88px 0 66px; color: #667063; font-family: ui-sans-serif, system-ui, sans-serif; font-size: .8rem; line-height: 1.65; }
footer strong { color: var(--phosphor); }

@media (max-width: 820px) {
  .game-hero { grid-template-columns: 1fr; gap: 22px; padding: 52px 0 34px; }
  .game-hero > p { max-width: 620px; }
  .play-layout { grid-template-columns: 1fr; }
  .console { justify-self: center; width: min(500px, 100%); }
  aside { max-width: 650px; }
}

@media (max-width: 520px) {
  main { width: calc(100% - 16px); }
  nav { min-height: 58px; padding: 0 5px; }
  nav > span { display: none; }
  .game-hero { padding: 5px 5px 3px; }
  .game-hero > div { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; }
  .game-hero .eyebrow { max-width: 120px; margin: 0; line-height: 1.5; }
  h1 { font-size: clamp(2.6rem, 14vw, 4rem); line-height: .8; text-align: right; }
  .game-hero > p { display: none; }
  .play-layout { gap: 44px; }
  .console { padding: 10px; border-radius: 19px; }
  .console-top > div { padding: 8px; }
  .console-top strong { font-size: .83rem; }
  .signal-message { min-height: 32px; padding-top: 9px; font-size: .61rem; }
  .rule-line { margin-bottom: 5px; font-size: .52rem; }
  .piece-tray { min-height: 78px; }
  .piece { min-height: 76px; }
  .piece-cell { width: 19px; height: 19px; }
  .game-over { inset: 25px 28px 0 0; }
  aside { padding: 0 8px; }
  footer { padding: 64px 8px; }
}

/* === P1.1 Leaderboard — Transmission Log === */
.leaderboard-link {
  margin-left: auto;
  padding: 6px 14px;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--phosphor);
  font-size: .62rem;
  letter-spacing: .09em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background .15s, border-color .15s;
}
.leaderboard-link:hover { background: var(--screen-raised); border-color: rgba(164,255,104,.4); }

.rank-status {
  margin: 10px 0 6px;
  font-size: .62rem;
  color: var(--muted);
  letter-spacing: .04em;
  font-variant-numeric: tabular-nums;
}
.rank-status::before { content: "> "; color: var(--phosphor); }

.leaderboard-top {
  list-style: none;
  margin: 6px 0 0;
  padding: 0;
  display: grid;
  gap: 5px;
  max-height: 280px;
  overflow-y: auto;
}
.leaderboard-top::-webkit-scrollbar { width: 4px; }
.leaderboard-top::-webkit-scrollbar-track { background: transparent; }
.leaderboard-top::-webkit-scrollbar-thumb { background: var(--line); border-radius: 2px; }

.leaderboard-top li {
  display: grid;
  grid-template-columns: 28px 1fr auto;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  background: var(--screen);
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: .66rem;
  position: relative;
  overflow: hidden;
}
.leaderboard-top .rank {
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  letter-spacing: .05em;
  font-size: .62rem;
}
.leaderboard-top li:nth-child(1) .rank { color: var(--phosphor); font-weight: 900; }
.leaderboard-top li:nth-child(1) { border-color: rgba(164,255,104,.42); box-shadow: inset 0 0 14px rgba(164,255,104,.06); }
.leaderboard-top li:nth-child(2) .rank { color: var(--phosphor); opacity: .82; }
.leaderboard-top li:nth-child(3) .rank { color: var(--amber); }

.leaderboard-top .name {
  color: var(--phosphor);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  letter-spacing: .02em;
}
.leaderboard-top .score-wrap { display: flex; align-items: center; gap: 8px; }
.leaderboard-top .signal-bar { width: 44px; height: 4px; background: rgba(164,255,104,.1); border-radius: 2px; overflow: hidden; }
.leaderboard-top .signal-bar-fill { height: 100%; background: var(--phosphor); border-radius: 2px; box-shadow: 0 0 6px rgba(164,255,104,.4); }
.leaderboard-top .score { color: var(--amber); font-variant-numeric: tabular-nums; font-weight: 700; min-width: 48px; text-align: right; }

.leaderboard-top li.is-me {
  background: rgba(164,255,104,.08);
  border-color: var(--phosphor);
  box-shadow: 0 0 0 1px rgba(164,255,104,.15), inset 0 0 18px rgba(164,255,104,.05);
}
.leaderboard-top li.is-me::after {
  position: absolute; inset: 0;
  background: repeating-linear-gradient(to bottom, transparent 0 2px, rgba(164,255,104,.04) 2px 3px);
  pointer-events: none; content: "";
}
.leaderboard-top li.is-me .name::before { content: "\25B6 "; color: var(--phosphor); font-size: .55rem; }

#submit-leaderboard {
  background: var(--phosphor); color: var(--ink); border: none;
  padding: 8px 14px; border-radius: 8px;
  font-weight: 900; font-size: .66rem; letter-spacing: .06em; text-transform: uppercase;
  cursor: pointer;
  box-shadow: 0 0 12px rgba(164,255,104,.3);
  transition: box-shadow .15s;
}
#submit-leaderboard:hover:not(:disabled) { box-shadow: 0 0 20px rgba(164,255,104,.5); }
#submit-leaderboard:disabled { opacity: .4; cursor: default; box-shadow: none; }

.leaderboard-panel[hidden] { display: none; }
.leaderboard-panel {
  position: fixed; inset: 0; z-index: 50;
  padding: 40px 20px; overflow-y: auto;
  display: flex; flex-direction: column; align-items: center; gap: 14px;
  background:
    linear-gradient(rgba(164,255,104,.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(164,255,104,.025) 1px, transparent 1px),
    rgba(9,13,9,.95);
  background-size: 28px 28px, 28px 28px, auto;
}
.leaderboard-panel .leaderboard-head {
  display: flex; justify-content: space-between; align-items: center;
  width: 100%; max-width: 480px;
  padding-bottom: 12px; border-bottom: 1px solid var(--line);
}
.leaderboard-panel h2 {
  margin: 0; font-size: .78rem; color: var(--phosphor);
  letter-spacing: .12em; text-transform: uppercase;
  font-family: ui-monospace, monospace; font-weight: 800;
}
.leaderboard-panel h2::before { content: "\25E2 "; color: var(--amber); }
.leaderboard-panel #close-leaderboard {
  background: transparent; border: 1px solid var(--line);
  color: var(--phosphor); width: 30px; height: 30px; border-radius: 50%;
  font-size: 1rem; cursor: pointer; display: grid; place-items: center;
  transition: border-color .15s, background .15s;
}
.leaderboard-panel #close-leaderboard:hover { border-color: var(--phosphor); background: rgba(164,255,104,.08); }
.leaderboard-panel .rank-status,
.leaderboard-panel .leaderboard-top { width: 100%; max-width: 480px; }
.leaderboard-panel .leaderboard-top { max-height: none; }

@media (max-width: 380px) {
  .leaderboard-top .signal-bar { display: none; }
}