/* Light Letters - the look of the panel.
   Everything is inside .light-letters, so it does not change the rest of your page.
   To change colours, edit the values right below. */

.light-letters {
  --ll-board-background: radial-gradient(120% 60% at 50% 0%, #1c1c1c 0%, #0c0c0c 70%);
  --ll-board-border: #262626;
  --ll-letter-color: #ffffff;      /* colour of the dimmed letters */
  --ll-field-background: #1b1b1b;  /* code field */
  --ll-field-border: #2e2e2e;
  --ll-field-text: #ececec;
  --ll-button-background: #f2f2f2;
  --ll-button-text: #111111;
  --ll-message-color: #ffc15e;     /* "unknown characters" etc. */
  --ll-font: system-ui, -apple-system, 'Segoe UI', Roboto, 'Noto Sans', 'Noto Sans SC', 'Microsoft YaHei', sans-serif;

  font-family: var(--ll-font);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.light-letters *,
.light-letters *::before,
.light-letters *::after { box-sizing: border-box; }


/* ---------- Code field + button ---------- */

.light-letters .ll-code-bar { display: flex; gap: 8px; margin: 0; }

.light-letters .ll-code-bar input {
  flex: 1;
  min-width: 0;
  font: inherit;
  font-size: 18px;
  letter-spacing: 0.08em;
  padding: 12px 14px;
  color: var(--ll-field-text);
  background: var(--ll-field-background);
  border: 1px solid var(--ll-field-border);
  border-radius: 8px;
}
.light-letters .ll-code-bar input:focus { outline: 2px solid #555; outline-offset: -1px; }

.light-letters .ll-code-bar button {
  font: inherit;
  font-size: 16px;
  font-weight: 650;
  padding: 0 26px;
  color: var(--ll-button-text);
  background: var(--ll-button-background);
  border: 1px solid var(--ll-button-background);
  border-radius: 8px;
  cursor: pointer;
}
.light-letters .ll-code-bar button:hover { filter: brightness(0.92); }


/* ---------- Messages under the field ---------- */

.light-letters .ll-status { display: flex; flex-direction: column; gap: 8px; }
.light-letters .ll-status:empty { display: none; }

.light-letters .ll-message {
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 13.5px;
  color: var(--ll-message-color);
  background: rgba(255, 193, 94, 0.1);
}
.light-letters .ll-error { color: #ff6b6f; background: rgba(255, 107, 111, 0.12); }

.light-letters .ll-clear-text {
  text-align: center;
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 0.12em;
}


/* ---------- The letter board ---------- */

.light-letters .ll-board {
  /* The letters grow and shrink with the width of the board. */
  container-type: inline-size;
  width: 100%;
  background: var(--ll-board-background);
  border: 1px solid var(--ll-board-border);
  border-radius: 16px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
}

/* Padding on an inner element, so "cqi" (1% of the board width) works. */
.light-letters .ll-board-inner { padding: 6cqi 5cqi 4cqi; }

.light-letters .ll-grid {
  display: grid;
  grid-template-columns: repeat(var(--ll-cols), 1fr);
}

.light-letters .ll-cell {
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 1 / 1.15;
  font-size: calc(52cqi / var(--ll-cols));
  font-weight: 500;
  color: var(--ll-letter-color);
  opacity: var(--ll-dim-opacity);
  user-select: none;
  transition: opacity 0.4s ease, color 0.4s ease, text-shadow 0.4s ease;
}

.light-letters .ll-cell.ll-lit {
  opacity: 1;
  color: var(--ll-lit-color);
  font-weight: 700;
  text-shadow:
    0 0 calc(var(--ll-glow) * 0.5em) var(--ll-lit-color),
    0 0 calc(var(--ll-glow) * 1.2em) color-mix(in srgb, var(--ll-lit-color) 60%, transparent);
}

.light-letters .ll-caption {
  margin-top: 3cqi;
  text-align: center;
  font-size: max(10px, 1.8cqi);
  letter-spacing: 0.45em;
  color: #5c5c5c;
}


/* ---------- Small screens ---------- */

@media (max-width: 720px) {
  .light-letters .ll-code-bar input { font-size: 16px; }
  .light-letters .ll-code-bar button { padding: 0 18px; }
}