/* Minimal dark sheet, deliberately close to the kana trainer it is modelled on. */
:root {
  --bg: #1b1b1b;
  --card: #262626;
  --line: #3a3a3a;
  --text: #d8d8d8;
  --dim: #8a8a8a;
  --bad: #e2544a;
  --ok: #5fb56a;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 24px 16px 40px;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 "Segoe UI", Helvetica, Arial, sans-serif;
  --char-font: sans-serif;
}

main { max-width: 940px; margin: 0 auto; }

hr {
  border: 0;
  border-top: 1px dashed var(--line);
  margin: 18px 0;
}

.head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

h1 {
  margin: 0;
  font-size: 30px;
  letter-spacing: -0.5px;
}

h2 {
  margin: 0 0 4px;
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--dim);
}

button {
  font: inherit;
  color: var(--text);
  background: #2f2f2f;
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 6px 12px;
  cursor: pointer;
}

button:hover { background: #3a3a3a; }
button.on { background: #4a4a4a; border-color: #666; color: #fff; }

button.link {
  background: none;
  border: 0;
  padding: 0;
  color: #7aa7d8;
  text-decoration: underline;
  cursor: pointer;
}

button.link:hover { background: none; color: #9dc3ea; }
button.link.danger { color: #b06b66; }

.tabs { display: flex; gap: 8px; }

/* --- game card --- */
.card {
  background: var(--card);
  padding: 28px 20px 18px;
  text-align: center;
}

.prompt {
  font-family: var(--char-font);
  font-size: 92px;
  line-height: 1.15;
  min-height: 108px;
  color: #eaeaea;
  transition: color 0.12s;
  user-select: none;
}

.practice.with-tone-guide {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 24px;
}
.question { min-width: 0; }
.tone-guide { text-align: left; font-size: 13px; }
.tone-guide ul { margin: 6px 0 0; padding-left: 18px; }
.tone-guide li { margin: 3px 0; }
.tone-guide b { font-weight: 600; }

.prompt.empty { color: var(--dim); font-size: 48px; }
.prompt.bad { color: var(--bad); }

#answer {
  width: 100%;
  max-width: 520px;
  margin: 6px auto 0;
  display: block;
  padding: 8px 10px;
  font: 18px/1.4 inherit;
  text-align: center;
  color: #fff;
  background: transparent;
  border: 2px solid #cfcfcf;
  border-radius: 3px;
}

#answer:focus { outline: none; border-color: #fff; }
#answer.ok, #answer.ok:focus { border-color: var(--ok); }
#answer::placeholder { color: #6e6e6e; font-size: 15px; }
#answer:disabled { border-color: var(--line); }

.reveal {
  margin-top: 10px;
  min-height: 22px;
  font-size: 15px;
  color: var(--bad);
}

.meta {
  margin-top: 22px;
  font-size: 13px;
  color: var(--dim);
  display: flex;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
}

.toggle-row { text-align: center; }

/* --- options --- */
.options { margin-top: 18px; }
.block { margin: 0 0 26px; }

.hint { margin: 0 0 10px; font-size: 13px; color: var(--dim); }

.presets { display: flex; flex-wrap: wrap; gap: 8px; }

.settings { display: flex; flex-direction: column; gap: 6px; font-size: 14px; }
.settings label { cursor: pointer; }
.settings label:has(input:disabled) { color: var(--dim); cursor: default; }
.settings input { margin-right: 6px; vertical-align: -1px; }
.radios { display: flex; gap: 14px; color: var(--dim); }
.radios label { color: var(--text); }

/* --- list chart --- */
.listchart { display: flex; flex-direction: column; gap: 2px; }

.listrow {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 4px 14px;
  padding: 6px 8px;
  background: #222;
  border-left: 3px solid transparent;
}

.listrow.on { background: var(--card); border-left-color: #7aa7d8; }

.rowlabel {
  min-width: 220px;
  font-size: 13px;
  color: var(--dim);
  cursor: pointer;
}

.listrow.on .rowlabel { color: var(--text); }
.rowlabel input { margin-right: 6px; vertical-align: -1px; }

.cells { display: flex; flex-wrap: wrap; gap: 10px; }

.cell { display: inline-flex; flex-direction: column; align-items: center; min-width: 34px; }
.cell b { font-family: var(--char-font); font-size: 22px; font-weight: normal; }
.cell i { font-style: normal; font-size: 11px; color: var(--dim); }

/* Small "?" beside a romanization, with a CSS-only tooltip on hover and keyboard focus. */
.help {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 13px;
  height: 13px;
  margin-left: 4px;
  padding: 0;
  border: 1px solid #4d4d4d;
  border-radius: 50%;
  background: #2f2f2f;
  color: var(--dim);
  font-size: 9px;
  line-height: 1;
  cursor: help;
  vertical-align: 1px;
}

.help:hover, .help:focus { background: #3d3d3d; color: var(--text); border-color: #6a6a6a; outline: none; }

.help::after {
  content: attr(data-tip);
  position: absolute;
  bottom: 145%;
  left: 50%;
  transform: translateX(-50%);
  width: 270px;
  padding: 9px 11px;
  background: #131313;
  border: 1px solid #4d4d4d;
  border-radius: 3px;
  color: var(--text);
  font-size: 12px;
  font-style: normal;
  font-weight: normal;
  line-height: 1.45;
  text-align: left;
  white-space: normal;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.12s;
  pointer-events: none;
  z-index: 5;
}

.help:hover::after, .help:focus::after { opacity: 1; visibility: visible; }

/* Unselected rows dim to match how the grid charts show what is out of play. */
.listrow:not(.on) .cell b { color: #565656; }
.listrow:not(.on) .cell i { color: #4a4a4a; }

/* --- grid chart --- */
.gridwrap { overflow-x: auto; padding-bottom: 4px; }

.gridchart { border-collapse: collapse; }

.gridchart th,
.gridchart td {
  border: 1px solid #333;
  padding: 2px;
  text-align: center;
  min-width: 40px;
}

.gridchart th { background: #222; color: var(--dim); font-weight: normal; }
.gridchart th.on { background: #303030; color: var(--text); }
.gridchart th.corner { border: 0; background: none; }
.gridchart th label { display: block; cursor: pointer; padding: 3px 4px; }
.gridchart th span { display: block; font-family: var(--char-font); font-size: 17px; }
.gridchart th.rowhead label { display: flex; align-items: center; gap: 5px; justify-content: flex-start; }

.gridchart td {
  color: #4e4e4e;
  padding: 3px 4px;
  line-height: 1.1;
}

.gridchart td b { font-family: var(--char-font); font-size: 19px; font-weight: normal; display: block; }
.gridchart td i { font-style: normal; font-size: 10px; }
.gridchart td.on { background: var(--card); color: var(--text); }
.gridchart td.on i { color: var(--dim); }
.gridchart td.gap { background: #1f1f1f; }

/* --- weak spots --- */
.weak { display: flex; flex-wrap: wrap; gap: 10px; font-size: 13px; color: var(--dim); margin-bottom: 10px; }
.weakcell { display: inline-flex; flex-direction: column; align-items: center; min-width: 34px; }
.weakcell b { font-family: var(--char-font); font-size: 22px; font-weight: normal; color: var(--bad); }
.weakcell i { font-style: normal; font-size: 11px; }

footer {
  margin-top: 30px;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
  font-size: 12px;
  color: #6a6a6a;
  text-align: center;
}

@media (max-width: 640px) {
  .practice.with-tone-guide { gap: 12px; }
  .tone-guide { max-width: 175px; font-size: 12px; }
  .prompt { font-size: 68px; min-height: 84px; }
  .rowlabel { min-width: 100%; }
}