:root {
  --ink: var(--t-ink);
  --muted: var(--t-muted);
  --paper: var(--t-bg);
  --white: var(--t-panel);
  --line: var(--t-line);
  --soft: var(--t-panel);
  --green: var(--t-accent);
  --green-dark: var(--t-success);
  --red: var(--t-danger);
  --mono: "DM Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.game-intro h1 strong { text-transform: uppercase; }
.game-intro h1 strong:last-child { text-decoration: underline; text-decoration-color: var(--green); text-decoration-thickness: 6px; text-underline-offset: 2px; }

.board-header > .connection { display: grid; visibility: hidden; min-height: 16px; }
.board-header > .connection.offline { visibility: visible; }
.gauge { display: inline-flex; align-items: flex-end; gap: 4px; }
.gauge i { width: 16px; height: 14px; border-radius: 2px; background: var(--line); transition: background-color .4s ease; }
.gauge i.on { background: var(--green); }

.ladder { position: relative; max-height: 340px; overflow-y: auto; scrollbar-width: thin; background: linear-gradient(var(--line), var(--line)) 10px 0 / 2px 100% no-repeat; }
.ladder-empty { padding: 42px 24px; color: var(--muted); font-size: 14px; text-align: center; }
.rung { position: relative; min-height: 70px; padding: 0 20px; display: grid; grid-template-columns: 42px 1fr 68px 96px; align-items: center; gap: 10px; border-bottom: 1px solid var(--line); }
.rung:last-child { border-bottom: 0; }
.rung::before { content: ""; position: absolute; left: 5px; top: 50%; width: 13px; height: 2px; background: var(--line); }
.rung.current { background: var(--t-panel-deep); box-shadow: 3px 0 0 var(--green) inset; }
.rung.current::before { background: var(--green); }
.rung-number { color: var(--muted); font: 400 12px var(--mono); }
.rung strong { font: 500 23px var(--mono); letter-spacing: .1em; }
.rung strong span { display: inline-grid; min-width: .72em; place-items: center; }
.changed-letter { border-radius: 3px; background: var(--green); color: #19191a; }
.changed-letter.ghost { text-decoration: line-through; opacity: .75; }
.rung-note { color: var(--muted); font: 500 12px var(--mono); text-align: center; text-transform: uppercase; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.rung-note .edit-glyph { margin-right: 4px; }
.current-label { color: var(--green-dark); font-size: 12px; font-weight: 600; text-transform: uppercase; letter-spacing: .04em; text-align: right; }
.rung-new { animation: rung-in .22s cubic-bezier(.2, .8, .2, 1); }
.rung-new strong span { animation: tile-in .15s cubic-bezier(.2, .8, .2, 1) backwards; animation-delay: calc(var(--tile, 0) * 30ms); }
.rung-new strong .changed-letter { animation: letter-pop .2s cubic-bezier(.34, 1.56, .64, 1) backwards; animation-delay: calc(var(--tile, 0) * 30ms); }
.ladder.win::before { background: var(--green); }
.ladder.win::after { content: ""; position: absolute; left: 8px; top: -20%; width: 6px; height: 72px; background: var(--green); box-shadow: 0 0 8px var(--green); animation: spine-sweep .6s ease both; }

.word-form { padding: 22px 20px 11px; border-top: 1px solid var(--line); }
.form-heading { margin-bottom: 8px; display: flex; justify-content: space-between; align-items: center; gap: 10px; }
.form-heading label { font-size: 14px; font-weight: 600; }
.form-heading span { color: var(--muted); font-size: 13px; }
.form-meta { display: flex; align-items: center; gap: 10px; }
.input-wrap { min-height: 48px; display: flex; align-items: center; border: 1px solid var(--t-line-strong); border-radius: 5px; overflow: hidden; transition: box-shadow .12s, border-color .12s; }
.input-wrap:focus-within { border-color: var(--ink); box-shadow: 0 0 0 2px rgba(25,25,24,.12); }
.input-wrap.preview-valid { border-color: var(--green-dark); box-shadow: 0 0 0 2px rgba(85,123,24,.12); }
.input-wrap.preview-invalid { border-color: var(--red); }
.input-wrap input { min-width: 80px; height: 50px; flex: 1; border: 0; outline: 0; padding: 0 14px; background: transparent; font: 500 18px var(--mono); text-transform: uppercase; letter-spacing: .06em; }
.input-wrap input::placeholder { color: var(--muted); text-transform: none; letter-spacing: 0; }
.input-feedback { color: var(--muted); font: 500 12px var(--mono); text-transform: uppercase; white-space: nowrap; }
.input-feedback.valid { color: var(--green-dark); }
.input-feedback.invalid { color: var(--red); }
.input-wrap button { align-self: stretch; min-width: 76px; margin: 4px; border: 0; border-radius: 3px; color: var(--white); background: var(--ink); font-size: 14px; font-weight: 600; cursor: pointer; }
.input-wrap button:hover:not(:disabled) { color: var(--ink); background: var(--green); }
.input-wrap button:disabled { color: var(--muted); background: var(--soft); cursor: default; }

.game-message.message-in { animation: message-in .15s ease; }
.shake { animation: shake .28s ease; }

.board-actions kbd { margin-left: 5px; color: var(--muted); font: 400 12px var(--mono); }
.board-actions .reveal-button { border: 0; color: var(--red); }
.hint-result { margin: 0 20px 20px; padding: 12px 14px; border-left: 3px solid var(--green); background: var(--t-panel-deep); font: 500 13px var(--mono); }

.solution { margin: 0 20px 20px; padding: 14px; border: 1px solid var(--line); border-radius: 5px; background: var(--white); }
.solution > div { display: flex; justify-content: space-between; color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .06em; gap: 10px; }
.solution p { margin: 10px 0 0; display: flex; flex-wrap: wrap; align-items: center; gap: 7px; }
.solution b { font: 500 14px var(--mono); text-transform: uppercase; }
.solution i { color: var(--muted); font-style: normal; }

.range-inputs { display: grid; grid-template-columns: 1fr 20px 1fr; align-items: end; gap: 8px; }
.range-inputs > span { padding-bottom: 11px; color: var(--muted); font-size: 13px; text-align: center; }
.range-inputs label { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .06em; }
.range-inputs input { width: 100%; height: 43px; margin-top: 6px; border: 1px solid var(--t-line-strong); border-radius: 4px; padding: 0 10px; background: var(--white); font: 500 14px var(--mono); }

.rule-example code { padding: 6px 8px; background: var(--white); font: 500 14px var(--mono); }

html[data-theme="dark"] dialog.modal .modal-card { border: 1px solid var(--t-line-strong); box-shadow: 0 28px 90px rgb(0 0 0 / 60%); }

@keyframes rung-in { from { opacity: 0; transform: translateY(-8px); } }
@keyframes tile-in { from { opacity: 0; transform: scale(.9); } }
@keyframes letter-pop { from { opacity: 0; transform: scale(.85); } }
@keyframes shake { 25% { transform: translateX(-4px); } 50% { transform: translateX(3px); } 75% { transform: translateX(-2px); } }
@keyframes message-in { from { opacity: 0; } }
@keyframes spine-sweep { from { top: -20%; } to { top: 105%; } }

@media (max-width: 600px) {
  .game-shell { width: calc(100% - 20px); margin-top: 32px; }
  .game-intro { margin-inline: 8px; display: block; }
  .rule-copy { max-width: none; margin-top: 10px; }
  .mode-switch { justify-content: space-evenly; }
  .site-header nav { grid-row: 3; grid-column: 1 / -1; flex-wrap: wrap; justify-content: center; }
  .board-header { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .board-header > div, .board-header > .connection { padding-inline: 8px; }
  .ladder { background-position: 6px 0; }
  .rung { padding-inline: 14px; grid-template-columns: 31px 1fr 47px; }
  .rung::before { left: 1px; width: 9px; }
  .ladder.win::after { left: 3px; }
  .rung strong { font-size: 17px; }
  .current-label { display: none; }
  .word-form { padding-inline: 14px; }
  .form-meta span { max-width: 160px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .input-feedback { display: none; }
  .board-actions { padding-inline: 14px; }
  .board-actions kbd { display: none; }
  .solution { margin-inline: 14px; }
  .hint-result { margin-inline: 14px; }
}

@media (max-width: 480px) {
  .board-header { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}