:root {
  --green-900: #14532d;
  --green-700: #1f6b3a;
  --green-500: #2f9e5c;
  --green-050: #eaf5ee;
  --gold: #b8860b;
  --red: #c0392b;
  --blue: #1d4ed8;
  --ink: #1c2420;
  --muted: #64756c;
  --line: #d9e3dc;
  --bg: #f5f7f5;
  --card: #ffffff;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(20, 40, 30, .10), 0 1px 2px rgba(20, 40, 30, .06);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", "Yu Gothic UI", Meiryo, sans-serif;
  font-size: 15px;
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
  padding-bottom: 56px;
}

/* ---------- header ---------- */
.app-header {
  background: linear-gradient(135deg, var(--green-900), var(--green-700));
  color: #fff;
  padding: calc(env(safe-area-inset-top) + 12px) 16px 12px;
}
.title-wrap { display: flex; align-items: center; gap: 8px; }
.logo { font-size: 22px; }
.app-header h1 { font-size: 17px; margin: 0; font-weight: 700; letter-spacing: .02em; }
.header-meta { font-size: 12px; opacity: .85; margin-top: 2px; }

/* ---------- tabs ---------- */
.tabs {
  display: flex;
  background: var(--card);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 20;
}
.tab {
  flex: 1;
  appearance: none;
  border: 0;
  background: transparent;
  padding: 12px 4px;
  font: inherit;
  font-weight: 600;
  font-size: 14px;
  color: var(--muted);
  border-bottom: 3px solid transparent;
  cursor: pointer;
}
.tab.is-active { color: var(--green-700); border-bottom-color: var(--green-500); }

main { padding: 12px; max-width: 900px; margin: 0 auto; }
.view { display: none; }
.view.is-active { display: block; }

/* ---------- generic bits ---------- */
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: 12px;
  overflow: hidden;
}
.card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 10px 12px;
  background: var(--green-050);
  border-bottom: 1px solid var(--line);
  font-weight: 700;
  font-size: 14px;
  color: var(--green-900);
}
.card-body { padding: 12px; }
.section-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--muted);
  margin: 16px 0 6px;
  letter-spacing: .04em;
}
.hint { font-size: 12px; color: var(--muted); margin: 4px 0 0; }
.row { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.grow { flex: 1 1 auto; min-width: 0; }
.spacer { flex: 1 1 auto; }

button, select, input, textarea {
  font: inherit;
  color: inherit;
}

/* iOS Safari はフォントが16px未満の入力欄にフォーカスすると自動でズームしてしまう。
   対局中に何度もズームされると使いづらいので、入力系は必ず16px以上にする。 */
input, select, textarea {
  font-size: 16px;
}

/* ダブルタップによるズーム待ちをなくし、タップ時の青いハイライトを消す */
button, .tab, .round-chip, .pname, label {
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}
.btn {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--ink);
  border-radius: 8px;
  padding: 8px 12px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn.primary { background: var(--green-700); border-color: var(--green-700); color: #fff; }
.btn.danger { background: #fff; border-color: #e6bdb7; color: var(--red); }
.btn.ghost { background: transparent; }
.btn.small { padding: 5px 9px; font-size: 13px; }
.btn[disabled] { opacity: .45; cursor: default; }

input[type="text"], input[type="number"], select {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 10px;
  background: #fff;
  width: 100%;
}
input:focus, select:focus { outline: 2px solid var(--green-500); outline-offset: -1px; }

.field { margin-bottom: 10px; }
.field > label { display: block; font-size: 12px; font-weight: 700; color: var(--muted); margin-bottom: 3px; }
.field-inline { display: flex; align-items: center; gap: 8px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; }

.pill {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 700;
  background: var(--green-050);
  color: var(--green-900);
  border: 1px solid var(--line);
}
.pill.warn { background: #fdf0e4; color: #9a5b12; border-color: #f0d5b5; }
.pill.ok { background: #e7f6ec; color: #14653c; border-color: #bfe4cc; }

.pos { color: var(--blue); }
.neg { color: var(--red); }
.num { font-variant-numeric: tabular-nums; }

/* ---------- round selector ---------- */
.round-bar { display: flex; gap: 6px; overflow-x: auto; padding-bottom: 4px; margin-bottom: 10px; }
.round-chip {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--card);
  border-radius: 999px;
  padding: 7px 14px;
  font-weight: 700;
  font-size: 13px;
  white-space: nowrap;
  cursor: pointer;
}
.round-chip.is-active { background: var(--green-700); border-color: var(--green-700); color: #fff; }
.round-chip .dot { font-size: 10px; margin-left: 4px; }

/* ---------- table card ---------- */
.seat-table { width: 100%; border-collapse: collapse; }
.seat-table th, .seat-table td {
  padding: 6px 4px;
  border-bottom: 1px solid var(--line);
  font-size: 13px;
  text-align: right;
}
.seat-table th { font-size: 11px; color: var(--muted); font-weight: 700; }
.seat-table th:nth-child(1), .seat-table td:nth-child(1) { width: 30px; text-align: center; }
.seat-table th:nth-child(2), .seat-table td:nth-child(2) { text-align: left; }
.seat-table td.score-cell { width: 104px; }
.seat-table td.score-cell input {
  text-align: right;
  padding: 9px 8px;
  font-size: 16px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}
.seat-table td.rank-cell { width: 38px; text-align: center; }
.seat-table td.pt-cell { width: 64px; font-weight: 700; }
.seat-table tr.is-selected { background: #fff6d8; }
.seat-table tr:last-child td { border-bottom: 0; }

.seat-badge {
  display: inline-block;
  width: 22px; height: 22px; line-height: 22px;
  border-radius: 50%;
  background: var(--green-050);
  color: var(--green-900);
  font-size: 12px; font-weight: 700;
  text-align: center;
}
.pname {
  background: none; border: 0; padding: 10px 6px; margin: -10px -6px;
  font-weight: 600; text-align: left; cursor: pointer; border-radius: 6px;
  min-height: 44px;
  max-width: 100%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.pname:hover { background: #f0f4f1; }
.rank-badge { font-weight: 700; }
.rank-1 { color: var(--gold); }
.rank-4 { color: var(--muted); }

.sum-row {
  display: flex; justify-content: space-between; align-items: center;
  padding-top: 8px; font-size: 12px; color: var(--muted);
}
.sum-row .bad { color: var(--red); font-weight: 700; }
.sum-row .good { color: var(--green-700); font-weight: 700; }

/* ---------- standings ---------- */
.standings-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.standings {
  /* width:100% だと収まらないときに最後の列だけ潰れて文字が切れるため、
     自然幅で組んでコンテナ側で横スクロールさせる */
  width: auto;
  min-width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  white-space: nowrap;
}
.standings th, .standings td { padding: 7px 8px; border-bottom: 1px solid var(--line); text-align: right; }
.standings thead th { position: sticky; top: 0; background: var(--green-050); color: var(--green-900); font-size: 11px; z-index: 1; }
.standings th.name-col, .standings td.name-col { text-align: left; position: sticky; left: 0; background: var(--card); z-index: 2; }
.standings thead th.name-col { z-index: 3; background: var(--green-050); }
.standings th.rk-col, .standings td.rk-col { width: 34px; text-align: center; position: sticky; left: 0; background: var(--card); z-index: 2; }
.standings thead th.rk-col { z-index: 3; background: var(--green-050); }
.standings td.name-col { left: 34px; }
.standings th.name-col { left: 34px; }
.standings tbody tr.top1 td { background: #fffaec; }
.standings tbody tr.top1 td.name-col, .standings tbody tr.top1 td.rk-col { background: #fffaec; }
.standings .total-col { font-weight: 700; font-size: 14px; }
.sub { font-size: 10px; color: var(--muted); margin-left: 2px; }

/* ---------- players ---------- */
.player-row {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 0; border-bottom: 1px solid var(--line);
}
.player-row:last-child { border-bottom: 0; }
.player-row .idx { width: 22px; color: var(--muted); font-size: 12px; text-align: right; }
.chip-ctl { display: flex; align-items: center; gap: 4px; }
.chip-ctl .val { min-width: 28px; text-align: center; font-weight: 700; font-variant-numeric: tabular-nums; }

.empty {
  text-align: center; color: var(--muted); padding: 28px 12px; font-size: 14px;
}

/* ---------- toast ---------- */
.toast {
  position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%);
  background: rgba(20, 40, 30, .92); color: #fff;
  padding: 10px 18px; border-radius: 999px; font-size: 13px; font-weight: 600;
  z-index: 100; max-width: 90vw; text-align: center;
}

/* 指で操作する端末では、誤タップしないようボタンを大きくする */
@media (pointer: coarse) {
  .btn { min-height: 44px; padding: 10px 14px; }
  .btn.small { min-height: 40px; padding: 8px 12px; font-size: 14px; }
  .round-chip { min-height: 44px; padding: 10px 16px; }
  .tab { padding: 14px 4px; }
  .chip-ctl .btn.small { min-width: 44px; }
  .player-row input[type="text"] { min-height: 44px; }
}

/* 総合順位表を狭い画面に収める（横スクロールなしで全列見えるようにする） */
@media (max-width: 420px) {
  .standings th, .standings td { padding: 7px 4px; }
  .standings td.rk-col, .standings th.rk-col { width: 24px; }
  .standings td.name-col, .standings th.name-col { left: 24px; }
  .standings .sub { font-size: 9px; margin-left: 1px; }
}

@media (max-width: 380px) {
  body { font-size: 14px; }
  main { padding: 10px; }
  .card-body { padding: 10px; }
  .seat-table td.score-cell { width: 96px; }
  .seat-table th, .seat-table td { padding: 6px 3px; }
}

/* ホームバー（セーフエリア）にボタンが隠れないようにする */
body {
  padding-bottom: calc(56px + env(safe-area-inset-bottom));
}
main {
  padding-left: max(12px, env(safe-area-inset-left));
  padding-right: max(12px, env(safe-area-inset-right));
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e8efe9;
    --muted: #9bb0a3;
    --line: #2f3d35;
    --bg: #121714;
    --card: #1a211d;
    --green-050: #1f2e25;
    --green-700: #2f9e5c;
    --green-900: #9fe0b8;
  }
  input[type="text"], input[type="number"], select { background: #141a17; color: var(--ink); }
  .btn { background: #212a25; }
  .btn.primary { background: #24804a; border-color: #24804a; }
  .btn.danger { background: #241a19; border-color: #5c3630; color: #f0928a; }
  .pname:hover { background: #26312b; }
  .seat-table tr.is-selected { background: #3a3520; }
  .standings tbody tr.top1 td,
  .standings tbody tr.top1 td.name-col,
  .standings tbody tr.top1 td.rk-col { background: #2a2a1c; }
  .pill.warn { background: #3a2a18; color: #e8b878; border-color: #5c4526; }
  .pill.ok { background: #17301f; color: #8fd6a8; border-color: #2f5c3f; }
  .pos { color: #6fa8ff; }
}

/* ==========================================================================
   使い方ガイド（全画面オーバーレイ）
   ========================================================================== */

.guide-btn {
  margin-left: auto;
  appearance: none;
  border: 1px solid rgba(255, 255, 255, .45);
  background: rgba(255, 255, 255, .12);
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  padding: 6px 12px;
  min-height: 34px;
  border-radius: 999px;
  cursor: pointer;
  white-space: nowrap;
}
.guide-btn::before { content: '？'; margin-right: 3px; }
.guide-btn:active { background: rgba(255, 255, 255, .25); }

.guide {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: var(--bg);
  display: flex;
  flex-direction: column;
}
.guide[hidden] { display: none !important; }

.guide-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: calc(env(safe-area-inset-top) + 12px) 16px 12px;
  background: linear-gradient(135deg, var(--green-900), var(--green-700));
  color: #fff;
  font-size: 16px;
  flex: 0 0 auto;
}
.guide-head .btn { background: rgba(255,255,255,.15); border-color: rgba(255,255,255,.45); color: #fff; }

.guide-body {
  flex: 1 1 auto;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding: 16px max(16px, env(safe-area-inset-left)) calc(32px + env(safe-area-inset-bottom));
  max-width: 720px;
  width: 100%;
  margin: 0 auto;
  scroll-behavior: smooth;
}
.guide-body h3 {
  font-size: 16px;
  color: var(--green-900);
  border-left: 4px solid var(--green-500);
  padding-left: 10px;
  margin: 28px 0 10px;
  scroll-margin-top: 8px;
}
.guide-body h3:first-of-type { margin-top: 18px; }
.guide-body p { margin: 8px 0; }
.guide-body ul { margin: 8px 0; padding-left: 20px; }
.guide-body li { margin: 4px 0; }
.guide-body code {
  background: var(--green-050);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 1px 5px;
  font-size: 13px;
}
.guide-body img {
  display: block;
  width: 100%;
  max-width: 300px;
  height: auto;
  margin: 12px auto;
  border: 1px solid var(--line);
  border-radius: 10px;
  box-shadow: var(--shadow);
  background: var(--card);
}

.guide-lead {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px;
  font-size: 13px;
  line-height: 1.7;
}

.guide-toc {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 14px;
}
.guide-toc a {
  font-size: 12.5px;
  font-weight: 700;
  text-decoration: none;
  color: var(--green-900);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 12px;
}

.guide-table {
  width: 100%;
  border-collapse: collapse;
  margin: 10px 0;
  font-size: 13px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.guide-table th, .guide-table td {
  padding: 8px 10px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}
.guide-table th { width: 34%; color: var(--green-900); font-weight: 700; white-space: nowrap; }
.guide-table tr:last-child th, .guide-table tr:last-child td { border-bottom: 0; }

.guide-note {
  background: var(--green-050);
  border: 1px solid var(--line);
  border-left: 4px solid var(--green-500);
  border-radius: 8px;
  padding: 10px 12px;
  font-size: 13px;
  line-height: 1.7;
}

.guide-faq { margin: 10px 0 0; }
.guide-faq dt {
  font-weight: 700;
  color: var(--green-900);
  margin-top: 14px;
  font-size: 14px;
}
.guide-faq dt::before { content: 'Q. '; }
.guide-faq dd { margin: 4px 0 0; font-size: 13px; line-height: 1.7; }

body.guide-open { overflow: hidden; }

/* ==========================================================================
   学習タブ（用語集 / 聴牌トレーニング）
   ========================================================================== */

.subtabs {
  display: flex;
  gap: 6px;
  margin-bottom: 12px;
}
.subtab {
  flex: 1;
  appearance: none;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--muted);
  font: inherit;
  font-weight: 700;
  font-size: 14px;
  padding: 10px 6px;
  min-height: 44px;
  border-radius: 10px;
  cursor: pointer;
  white-space: nowrap;   /* 「イーシャンテン」が2行に折り返さないように */
}
.subtab.is-active {
  background: var(--green-700);
  border-color: var(--green-700);
  color: #fff;
}

/* ---- 牌 ---- */
.mj-tile {
  width: 30px;
  height: 43px;
  display: block;
  flex: 0 0 auto;
}
.mj-hand {
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
  align-items: flex-end;
}
/* 出題の手牌13枚は1行に収める。収まらない画面では横スクロールさせ、
   折り返して2段になるのを防ぐ（牌姿が読み取りにくくなるため）。 */
.mj-hand-wrap {
  display: flex;
  justify-content: center;
  padding: 6px 0 2px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.mj-hand-wrap .mj-hand {
  gap: 1px;
  justify-content: center;
  flex-wrap: nowrap;
  margin: 0 auto;
}
.mj-hand-wrap .mj-tile { width: 24px; height: 35px; }

.mj-question {
  text-align: center;
  font-weight: 700;
  font-size: 15px;
  color: var(--green-900);
  margin: 10px 0 0;
}

/* ---- 用語集 ---- */
.gl-entry {
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}
.gl-entry:first-child { padding-top: 0; }
.gl-entry:last-child { border-bottom: 0; padding-bottom: 0; }
.gl-term {
  font-weight: 700;
  font-size: 14px;
  color: var(--green-900);
  margin-bottom: 3px;
}
.gl-desc { font-size: 13px; line-height: 1.7; }
.gl-tiles { margin-top: 8px; }
.gl-waits {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  margin-top: 8px;
  padding: 8px;
  background: var(--green-050);
  border-radius: 8px;
}
.gl-waits-label {
  font-size: 11px;
  font-weight: 700;
  color: #fff;
  background: var(--green-700);
  border-radius: 999px;
  padding: 3px 9px;
  white-space: nowrap;
}
.gl-waits-label.miss { background: var(--red); }
.gl-waits-name { font-size: 12px; color: var(--muted); }

/* ---- 牌を選ぶ ---- */
.mj-picker-group { margin-bottom: 10px; }
.mj-picker-group:last-child { margin-bottom: 0; }
.mj-picker-label {
  display: block;
  font-size: 11px;
  font-weight: 700;
  color: var(--muted);
  margin-bottom: 4px;
}
.mj-picker-row {
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  gap: 3px;
}
.mj-pick {
  appearance: none;
  border: 2px solid transparent;
  background: none;
  padding: 1px;
  border-radius: 6px;
  cursor: pointer;
  min-width: 0;
  display: flex;
  justify-content: center;
}
.mj-pick .mj-tile { width: 100%; height: auto; max-width: 34px; }
.mj-pick.is-on {
  border-color: var(--green-500);
  background: var(--green-050);
  box-shadow: 0 0 0 1px var(--green-500);
}

/* ---- 結果 ---- */
.card-head.is-correct { background: #e7f6ec; color: #14653c; }
.card-head.is-wrong { background: #fdecea; color: #96281b; }
.mj-result-line {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 8px;
}
.mj-shape {
  font-size: 13px;
  color: var(--muted);
  margin: 4px 0 0;
}

/* 5タブになるので、狭い画面では文字を詰める */
@media (max-width: 420px) {
  .tab { font-size: 12.5px; padding: 12px 2px; }
  .subtab { font-size: 12px; padding: 10px 2px; }
  .mj-tile { width: 26px; height: 38px; }
  .mj-hand-wrap .mj-tile { width: 22px; height: 32px; }
}

@media (prefers-color-scheme: dark) {
  .card-head.is-correct { background: #17301f; color: #8fd6a8; }
  .card-head.is-wrong { background: #351d1a; color: #f0928a; }
  .mj-pick.is-on { background: #1f2e25; }
}