/* ------------------------------------------------------------------
   Cryptogram — a printed-page aesthetic: hunter green ink on green-cream
   paper, with brass rules.
   ------------------------------------------------------------------ */

:root {
  --paper:      #eaefe1;
  --paper-2:    #dfe6d3;
  --card:       #f4f7ec;
  --ink:        #16281b;   /* deep hunter green, near-ink */
  --ink-soft:   #3c4f40;
  --ink-faint:  #6d8070;
  --rule:       #c2cfb8;
  --rule-soft:  #d5dfca;
  --accent:     #2c5d38;   /* hunter green */
  --brass:      #9a7b28;
  --good:       #4a7d4f;
  --bad:        #a8362f;
  --focus:      #2f5d8a;

  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, "Times New Roman", serif;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;

  --radius: 3px;
  --shadow: 0 1px 2px rgba(22, 40, 27, .06), 0 8px 24px -16px rgba(22, 40, 27, .35);
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper:      #101610;
    --paper-2:    #151d15;
    --card:       #18211a;
    --ink:        #e2ebda;
    --ink-soft:   #a6b49f;
    --ink-faint:  #71806c;
    --rule:       #2c3a2e;
    --rule-soft:  #212c23;
    --accent:     #79ba86;   /* light hunter green */
    --brass:      #c9a84c;
    --good:       #86c48f;
    --bad:        #e08b81;
    --focus:      #7fa9d8;
    --shadow: 0 1px 2px rgba(0, 0, 0, .5), 0 8px 24px -16px rgba(0, 0, 0, .9);
  }
}

/* Explicit toggle wins over the media query, in both directions. */
:root[data-theme="light"] {
  --paper: #eaefe1; --paper-2: #dfe6d3; --card: #f4f7ec;
  --ink: #16281b; --ink-soft: #3c4f40; --ink-faint: #6d8070;
  --rule: #c2cfb8; --rule-soft: #d5dfca;
  --accent: #2c5d38; --brass: #9a7b28;
  --good: #4a7d4f; --bad: #a8362f; --focus: #2f5d8a;
  --shadow: 0 1px 2px rgba(22, 40, 27, .06), 0 8px 24px -16px rgba(22, 40, 27, .35);
}
:root[data-theme="dark"] {
  --paper: #101610; --paper-2: #151d15; --card: #18211a;
  --ink: #e2ebda; --ink-soft: #a6b49f; --ink-faint: #71806c;
  --rule: #2c3a2e; --rule-soft: #212c23;
  --accent: #79ba86; --brass: #c9a84c;
  --good: #86c48f; --bad: #e08b81; --focus: #7fa9d8;
  --shadow: 0 1px 2px rgba(0, 0, 0, .5), 0 8px 24px -16px rgba(0, 0, 0, .9);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.6;
  -webkit-text-size-adjust: 100%;
  padding-bottom: 3rem;
}

main {
  max-width: 62rem;
  margin: 0 auto;
  padding: 0 1.25rem;
}

.skip-link {
  position: absolute; left: -9999px;
  background: var(--card); color: var(--ink);
  padding: .6rem 1rem; z-index: 10; border: 1px solid var(--rule);
}
.skip-link:focus { left: 1rem; top: 1rem; }

/* ---------------------------------------------------------- masthead */

.masthead {
  border-bottom: 1px solid var(--rule);
  background: var(--paper-2);
}
.masthead-inner {
  max-width: 62rem;
  margin: 0 auto;
  padding: 1.6rem 1.25rem 1.3rem;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}
.masthead h1 {
  margin: 0;
  font-size: clamp(1.9rem, 5.5vw, 2.7rem);
  font-weight: 400;
  letter-spacing: .22em;
  text-transform: uppercase;
  line-height: 1.05;
}
.tagline {
  margin: .5rem 0 0;
  font-size: .82rem;
  letter-spacing: .13em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.icon-btn {
  flex: none;
  width: 2.4rem; height: 2.4rem;
  border: 1px solid var(--rule);
  border-radius: 50%;
  background: var(--card);
  color: var(--ink-soft);
  font-size: 1.05rem;
  cursor: pointer;
}
.icon-btn:hover { color: var(--ink); border-color: var(--ink-faint); }

/* ---------------------------------------------------------- controls */

.controls { padding: 1.5rem 0 0; }

.control-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .55rem;
}

.btn {
  font-family: var(--serif);
  font-size: .95rem;
  padding: .5rem 1rem;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--card);
  color: var(--ink);
  cursor: pointer;
  transition: border-color .12s, background .12s;
}
.btn:hover:not(:disabled) { border-color: var(--ink-faint); }
.btn:disabled { opacity: .45; cursor: default; }
.btn-primary {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}
.btn-primary:hover:not(:disabled) { opacity: .87; }
.btn-quiet { color: var(--ink-soft); }

.field {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  font-size: .78rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.field select {
  font-family: var(--serif);
  font-size: .9rem;
  letter-spacing: 0;
  text-transform: none;
  color: var(--ink);
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: .4rem .5rem;
}
.stat-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1.4rem;
  margin-top: 1.1rem;
  padding: .7rem 0;
  border-top: 1px solid var(--rule-soft);
  border-bottom: 1px solid var(--rule-soft);
}
.stat { display: inline-flex; align-items: baseline; gap: .4rem; }
.stat-label {
  font-size: .7rem; letter-spacing: .14em; text-transform: uppercase;
  color: var(--ink-faint);
}
.stat-value { font-variant-numeric: tabular-nums; font-size: 1rem; }

/* ------------------------------------------------------------ puzzle */

.puzzle-shell { padding: 2rem 0 .5rem; }

.grid {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: .1rem 1.1rem;          /* row gap, word gap */
  justify-content: center;
  padding: 1.9rem 1.1rem 1.5rem;
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  min-height: 9rem;
}

.word { display: flex; gap: .18rem; }

.cell {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 1.55rem;
  padding: .1rem 0 .15rem;
  border-radius: 2px;
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
}
.cell.punct { cursor: default; width: auto; min-width: .5rem; }

.slot {
  width: 100%;
  height: 1.85rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.22rem;
  line-height: 1;
  border-bottom: 1.5px solid var(--rule);
  color: var(--ink);
}
.cell.punct .slot {
  border-bottom: none;
  color: var(--ink-soft);
  align-items: flex-end;
}

/* Letter tiles are native <input>s; strip the UA chrome so they read as the
   same underlined slots, while keeping real focus and keyboard behaviour. */
input.slot {
  display: block;
  text-align: center;
  line-height: 1.85rem;
  padding: 0;
  margin: 0;
  border: none;
  border-bottom: 1.5px solid var(--rule);
  border-radius: 0;
  background: transparent;
  font-family: inherit;
  text-transform: uppercase;
  color: var(--ink);
  outline: none;
  box-shadow: none;
  -webkit-appearance: none;
  appearance: none;
  caret-color: var(--accent);
  /* The .cell above sets user-select:none; iOS Safari then blocks typing into
     the input entirely. Re-enabling selection on the input restores text entry. */
  -webkit-user-select: text;
  user-select: text;
  touch-action: manipulation;
}
input.slot:focus { outline: none; }
input.slot:read-only { cursor: default; caret-color: transparent; }

.cipher {
  height: 1.15rem;
  display: flex;
  align-items: center;
  font-family: var(--mono);
  font-size: .68rem;
  letter-spacing: .04em;
  color: var(--ink-faint);
  margin-top: .22rem;
}

.cell.selected .slot   { border-bottom-color: var(--accent); border-bottom-width: 2.5px; }
.cell.selected .cipher { color: var(--accent); font-weight: 700; }
.cell.peer .slot       { border-bottom-color: var(--brass); border-bottom-width: 2.5px; }
.cell.peer .cipher     { color: var(--brass); font-weight: 700; }
.cell.revealed .slot   { color: var(--brass); font-weight: 600; }
.cell.conflict .slot   { color: var(--bad); border-bottom-color: var(--bad); }
.cell:not(.punct):hover .slot { background: color-mix(in srgb, var(--ink) 5%, transparent); }

.grid.solved .slot { color: var(--good); border-bottom-color: color-mix(in srgb, var(--good) 45%, transparent); }
.grid.solved .cell.revealed .slot { color: var(--brass); }

.message {
  min-height: 1.5rem;
  margin: 1rem 0 0;
  text-align: center;
  font-size: .95rem;
  color: var(--ink-soft);
}
.message.good { color: var(--good); }
.message.bad  { color: var(--bad); }

/* ---------------------------------------------------- solution card */

.solution-card {
  margin: 1.4rem auto 0;
  max-width: 40rem;
  padding: 1.5rem 1.6rem;
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  text-align: center;
}
.solution-quote {
  margin: 0;
  font-size: 1.16rem;
  font-style: italic;
  line-height: 1.55;
}
.solution-attr {
  margin: .9rem 0 0;
  font-size: .8rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.solution-source {
  display: block;
  margin-top: .3rem;
  letter-spacing: .06em;
  text-transform: none;
  font-style: italic;
  color: var(--ink-faint);
}
.solution-meta {
  margin: .9rem 0 0;
  font-size: .85rem;
  color: var(--ink-faint);
  font-variant-numeric: tabular-nums;
}

/* ------------------------------------------------- alphabet & tables */

.section-heading {
  margin: 0 0 .7rem;
  font-size: .72rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  font-weight: 400;
  color: var(--ink-faint);
}

.bank { margin-top: 2.2rem; }
.bank-grid {
  display: flex;
  flex-wrap: wrap;
  gap: .3rem;
}
.bank-letter {
  width: 1.7rem; height: 1.7rem;
  display: flex; align-items: center; justify-content: center;
  font-size: .92rem;
  border: 1px solid var(--rule-soft);
  border-radius: 2px;
  color: var(--ink-soft);
  background: var(--card);
}
.bank-letter.used {
  color: var(--ink-faint);
  background: transparent;
  border-color: transparent;
  text-decoration: line-through;
  text-decoration-color: var(--ink-faint);
}
.bank-letter.dupe {
  color: var(--bad);
  border-color: var(--bad);
  text-decoration: none;
}

/* -------------------------------------------------------------- help */

.help { margin-top: 2.4rem; max-width: 44rem; }
.help p { margin: 0 0 .8rem; font-size: .95rem; color: var(--ink-soft); }
.keys { color: var(--ink-faint) !important; font-size: .85rem !important; }
kbd {
  font-family: var(--mono);
  font-size: .75rem;
  padding: .12rem .35rem;
  border: 1px solid var(--rule);
  border-bottom-width: 2px;
  border-radius: 3px;
  background: var(--card);
  color: var(--ink-soft);
}

.colophon {
  max-width: 62rem;
  margin: 3rem auto 0;
  padding: 1.2rem 1.25rem 0;
  border-top: 1px solid var(--rule-soft);
  font-size: .8rem;
  color: var(--ink-faint);
}
.colophon p { margin: 0; }

:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }

@media (max-width: 620px) {
  body { font-size: 16px; }
  .grid { gap: .1rem .75rem; padding: 1.4rem .6rem 1.1rem; }
  .cell { width: 1.35rem; }
  .slot { height: 1.6rem; font-size: 1.08rem; }
  input.slot { line-height: 1.6rem; }
  .cipher { font-size: .62rem; }
  .stat-row { gap: 1rem; }
  .control-row .btn { flex: 1 1 auto; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}