/* ========== 配色（仕様書 §2） ========== */
:root {
  --surface:        #fcfcfb;
  --plane:          #f9f9f7;
  --ink-primary:    #0b0b0b;
  --ink-secondary:  #52514e;
  --ink-muted:      #898781;
  --grid:           #e1e0d9;
  --axis:           #c3c2b7;
  --border:         rgba(11,11,11,0.10);
  --series-1:       #2a78d6;
  --series-2:       #eb6834;
  --series-3:       #1baf7a;
  --tint-1:         rgba(42,120,214,0.10);
  --tint-2:         rgba(235,104,52,0.10);
  --tint-3:         rgba(27,175,122,0.14);
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --surface: #1a1a19; --plane: #0d0d0d;
    --ink-primary: #ffffff; --ink-secondary: #c3c2b7; --ink-muted: #898781;
    --grid: #2c2c2a; --axis: #383835; --border: rgba(255,255,255,0.10);
    --series-1: #3987e5; --series-2: #d95926; --series-3: #199e70;
    --tint-1: rgba(57,135,229,0.18); --tint-2: rgba(217,89,38,0.18); --tint-3: rgba(25,158,112,0.20);
  }
}
:root[data-theme="dark"] {
  --surface: #1a1a19; --plane: #0d0d0d;
  --ink-primary: #ffffff; --ink-secondary: #c3c2b7; --ink-muted: #898781;
  --grid: #2c2c2a; --axis: #383835; --border: rgba(255,255,255,0.10);
  --series-1: #3987e5; --series-2: #d95926; --series-3: #199e70;
  --tint-1: rgba(57,135,229,0.18); --tint-2: rgba(217,89,38,0.18); --tint-3: rgba(25,158,112,0.20);
}
:root[data-theme="light"] { color-scheme: light; }
:root[data-theme="dark"]  { color-scheme: dark; }

/* ========== 基本 ========== */
* { box-sizing: border-box; }

/* 文字サイズ切替：html の font-size を変えることで rem 指定が一斉に拡大する */
html { scroll-behavior: smooth; font-size: 16px; }
html[data-fontsize="large"]  { font-size: 19px; }
html[data-fontsize="xlarge"] { font-size: 22px; }

body {
  margin: 0;
  background: var(--plane);
  color: var(--ink-primary);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  line-height: 1.75;
  font-size: 1rem;
  overflow-x: hidden;
}
main { max-width: 800px; margin: 0 auto; padding: 0 14px 48px; }
section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px 20px;
  margin: 20px 0;
  scroll-margin-top: 4.5rem; /* 文字を大きくするとナビも高くなるので rem で追従させる */
}
h1 { font-size: clamp(1.5rem, 5vw, 2.3rem); line-height: 1.4; margin: 0.4em 0; }
h2 { font-size: 1.25rem; margin: 0 0 0.6em; line-height: 1.5; }
h2 .secno {
  display: inline-block; font-size: 0.8rem; font-weight: 600;
  color: var(--ink-muted); border: 1px solid var(--grid); border-radius: 6px;
  padding: 0 8px; margin-right: 8px; vertical-align: 2px;
}
p { margin: 0.6em 0; }
.lead { color: var(--ink-secondary); }
button, select, input { font-family: inherit; font-size: 1rem; }
button {
  cursor: pointer; border: 1px solid var(--border); border-radius: 8px;
  background: var(--surface); color: var(--ink-primary); padding: 8px 14px;
}
button:hover { border-color: var(--axis); }
button[aria-pressed="true"] {
  background: var(--tint-1); border-color: var(--series-1);
  font-weight: 700;
}
button.primary {
  background: var(--series-1); color: #fff; border-color: transparent; font-weight: 700;
}
:focus-visible { outline: 2px solid var(--series-1); outline-offset: 2px; border-radius: 4px; }

/* ========== ナビ ========== */
nav {
  position: sticky; top: 0; z-index: 50;
  background: var(--plane);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; gap: 4px;
  overflow-x: auto; white-space: nowrap;
  padding: 8px 10px;
}
nav a {
  color: var(--ink-secondary); text-decoration: none; font-size: 0.82rem;
  padding: 4px 8px; border-radius: 6px; flex-shrink: 0;
}
nav a:hover { color: var(--ink-primary); background: var(--tint-1); }
#fontToggle  { margin-left: auto; font-size: 0.8rem; padding: 4px 10px; flex-shrink: 0; }
#themeToggle { font-size: 0.8rem; padding: 4px 10px; flex-shrink: 0; }

/* ========== 導入画面（目的の提示） ========== */
body.intro-open { overflow: hidden; }
#intro {
  position: fixed; inset: 0; z-index: 100;
  /* 三系列色のごく薄い光をにじませた背景（静的装飾） */
  background:
    radial-gradient(46rem 30rem at 12% -6%,  var(--tint-1), transparent 60%),
    radial-gradient(40rem 28rem at 106% 30%, var(--tint-2), transparent 62%),
    radial-gradient(44rem 30rem at 50% 112%, var(--tint-3), transparent 60%),
    var(--plane);
  overflow-y: auto;
  display: flex; justify-content: center;
  padding: 24px 16px;
}
#intro[hidden] { display: none; }
/* 中央寄せは align-items ではなく margin:auto で行う。
   align-items:center だと内容が画面より高いとき上端が切れてスクロールできなくなるため。 */
.intro-inner {
  margin: auto;
  max-width: 720px; width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 34px 30px 30px;
  text-align: center;
  position: relative; overflow: hidden;
  box-shadow: 0 24px 70px -24px rgba(11, 11, 11, 0.28);
}
/* カード上端のアクセントライン（3系列色のグラデーション） */
.intro-inner::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 5px;
  background: linear-gradient(90deg, var(--series-1), var(--series-3) 55%, var(--series-2));
}
.intro-kicker {
  display: inline-block;
  margin: 0 0 16px; color: var(--ink-secondary);
  font-size: 0.85rem; font-weight: 600; letter-spacing: 0.14em;
  border: 1px solid var(--grid); border-radius: 999px;
  padding: 3px 16px;
  background: var(--plane);
}
/* 冒頭のトークン列（静的装飾・本編§1の予告） */
.intro-tokens { margin: 0 0 18px; line-height: 2.1; }
.intro-tokens .tok { font-size: 0.95rem; }
.intro-caret {
  display: inline-block; width: 2px; height: 1.15em;
  background: var(--series-1); vertical-align: -3px; margin-left: 3px;
}
.intro-purpose {
  margin: 0 auto 24px;
  font-size: clamp(1.1rem, 3.2vw, 1.45rem);
  font-weight: 700; line-height: 1.9;
}
.intro-purpose em {
  font-style: normal;
  background: var(--tint-1);
  box-shadow: 0 -0.45em 0 0 var(--tint-1) inset; /* 蛍光ペン風 */
  color: var(--series-1);
  padding: 0 2px;
}
.intro-facts {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 10px; text-align: left; margin-bottom: 22px;
}
.intro-fact {
  display: flex; flex-direction: column; gap: 6px;
  border: 1px solid var(--grid); border-radius: 12px;
  background: var(--plane);
  padding: 12px 14px;
}
.intro-fact-label {
  font-size: 0.78rem; font-weight: 700; letter-spacing: 0.06em;
  color: var(--series-1);
}
.intro-fact-body { line-height: 1.7; font-size: 0.88rem; }
/* 7つの実験プレビュー */
.intro-chapters { margin-bottom: 26px; }
.intro-chapters-title {
  margin: 0 0 12px; font-size: 1.02rem; font-weight: 700;
  display: flex; align-items: center; gap: 12px;
}
.intro-chapters-title::before, .intro-chapters-title::after {
  content: ""; flex: 1; height: 1px; background: var(--grid);
}
.intro-chapters-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 12px 8px;
}
.intro-ch {
  position: relative;
  display: grid; grid-template-columns: auto 1fr; grid-template-rows: auto auto;
  column-gap: 10px; row-gap: 1px; align-items: center;
  text-align: left; padding: 10px 12px;
  background: var(--surface);
  border: 1px solid var(--grid); border-radius: 12px;
  line-height: 1.5;
  transition: transform 0.12s ease, border-color 0.12s ease, box-shadow 0.12s ease;
}
.intro-ch:hover {
  transform: translateY(-2px);
  border-color: var(--series-1);
  box-shadow: 0 8px 20px -10px rgba(11, 11, 11, 0.35);
}
.intro-ch-no {
  grid-row: 1 / 3;
  width: 1.9rem; height: 1.9rem; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-weight: 800; font-size: 0.95rem;
}
.intro-ch-no.c1 { background: var(--series-1); }
.intro-ch-no.c2 { background: var(--series-2); }
.intro-ch-no.c3 { background: var(--series-3); }
.intro-ch-name { font-weight: 700; font-size: 0.92rem; }
.intro-ch-desc { font-size: 0.8rem; color: var(--ink-secondary); }
.intro-ch-badge {
  position: absolute; top: -0.8em; right: 10px;
  font-style: normal; font-size: 0.68rem; font-weight: 700;
  color: var(--series-2); border: 1px solid var(--series-2);
  border-radius: 999px; padding: 0 7px;
  background: var(--surface); white-space: nowrap;
}
.intro-chapters-hint { margin: 10px 0 0; font-size: 0.82rem; color: var(--ink-muted); }
.intro-start {
  font-size: 1.25rem; padding: 16px 64px; border-radius: 999px;
  min-height: 56px; /* 押しやすい大きさを確保 */
  box-shadow: 0 10px 24px -10px var(--series-1);
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}
.intro-start:hover { transform: translateY(-1px); box-shadow: 0 14px 28px -10px var(--series-1); }
.intro-sub { margin: 12px 0 0; font-size: 0.9rem; color: var(--ink-secondary); }
.intro-tools {
  margin-top: 24px; padding-top: 18px;
  border-top: 1px solid var(--border);
  display: flex; gap: 10px; align-items: center; justify-content: center;
  flex-wrap: wrap;
  font-size: 0.9rem; color: var(--ink-secondary);
}
.intro-note {
  margin: 14px 0 0; font-size: 0.85rem; color: var(--ink-muted); line-height: 1.7;
}
@media (prefers-reduced-motion: reduce) {
  .intro-ch, .intro-ch:hover, .intro-start, .intro-start:hover { transition: none; transform: none; }
}
@media (max-width: 640px) {
  .intro-facts { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
  .intro-inner { padding: 26px 18px 24px; }
  .intro-chapters-grid { grid-template-columns: 1fr; }
  .intro-start { width: 100%; padding: 16px 20px; }
}

/* ========== 使い方セクション（初心者向け案内） ========== */
#usage { border-color: var(--series-1); border-width: 2px; }
#usage .usage-lead { font-size: 1.05rem; margin-bottom: 18px; }
.usage-grid { display: grid; gap: 12px; }
.usage-card {
  display: flex; gap: 14px; align-items: flex-start;
  background: var(--tint-1); border-radius: 10px; padding: 14px 16px;
}
.usage-num {
  flex-shrink: 0;
  width: 2rem; height: 2rem; border-radius: 50%;
  background: var(--series-1); color: #fff;
  font-weight: 700; font-size: 1.05rem;
  display: flex; align-items: center; justify-content: center;
  margin-top: 2px;
}
.usage-card h3 { margin: 0 0 4px; font-size: 1.02rem; line-height: 1.5; }
.usage-card p  { margin: 0; }
.usage-list { margin: 8px 0 0; padding-left: 1.2em; }
.usage-list li { margin: 4px 0; }
.usage-tip {
  border: 1px dashed var(--axis); border-radius: 10px;
  padding: 12px 16px; margin-top: 14px;
}
.usage-tip h3 { margin: 0 0 4px; font-size: 1rem; }
.usage-tip p  { margin: 0; }
@media (max-width: 480px) {
  .usage-card { gap: 10px; padding: 12px; }
}

/* ========== 注記（誠実さ） ========== */
.note {
  font-size: 0.88rem; color: var(--ink-secondary);
  border-left: 3px solid var(--series-2);
  background: var(--tint-2);
  border-radius: 0 8px 8px 0;
  padding: 8px 12px; margin-top: 14px; line-height: 1.6;
}

/* ========== トークンチップ ========== */
.tokline { line-height: 2.3; word-break: break-all; }
.tok {
  display: inline-block; border: 1px solid var(--border); border-radius: 6px;
  padding: 1px 7px; margin: 2px 2px; font-size: 0.95rem; white-space: pre-wrap;
}
.tok.alt0 { background: var(--tint-1); }
.tok.alt1 { background: var(--tint-2); }

/* ========== §0 ヒーロー ========== */
#sec0 { text-align: center; padding-top: 40px; padding-bottom: 36px; }
#heroAnim { min-height: 3.2em; margin-top: 18px; }
#heroAnim .tok { font-size: 1.05rem; animation: pop .25s ease; }
#heroAnim .caret {
  display: inline-block; width: 2px; height: 1.2em; background: var(--series-1);
  vertical-align: -3px; animation: blink 0.8s steps(1) infinite; margin-left: 2px;
}
@keyframes pop { from { transform: translateY(4px); opacity: 0; } to { transform: none; opacity: 1; } }
@keyframes blink { 50% { opacity: 0; } }
@media (prefers-reduced-motion: reduce) {
  #heroAnim .tok { animation: none; }
  #heroAnim .caret { animation: none; }
  html { scroll-behavior: auto; }
  .bar { transition: none !important; }
}

/* ========== §1 ========== */
#tokInput {
  width: 100%; min-height: 3.2em; resize: vertical;
  background: var(--plane); color: var(--ink-primary);
  border: 1px solid var(--axis); border-radius: 8px; padding: 10px;
  line-height: 1.6;
}
.counter-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0; }
.counter {
  flex: 1 1 100px; text-align: center; background: var(--plane);
  border: 1px solid var(--grid); border-radius: 10px; padding: 8px 4px;
}
.counter .num { font-size: 1.5rem; font-weight: 700; display: block; line-height: 1.3; }
.counter .lbl { font-size: 0.75rem; color: var(--ink-muted); }
.preset-row { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; }
.preset-row button { font-size: 0.85rem; padding: 6px 10px; }
#tokOut { border: 1px dashed var(--grid); border-radius: 10px; padding: 10px; min-height: 3em; }

/* ========== §2 散布図 ========== */
.scatter-wrap { position: relative; }
#scatter { width: 100%; height: auto; display: block; background: var(--plane); border: 1px solid var(--grid); border-radius: 10px; }
#scatter .pt { cursor: pointer; }
#scatter .pt:focus { outline: none; }
#scatter .pt:focus .marker, #scatter .pt:hover .marker { stroke: var(--ink-primary); stroke-width: 2; }
#scatter .pt.selected .marker { stroke: var(--ink-primary); stroke-width: 2.5; }
#scatterTip {
  position: absolute; pointer-events: none; display: none;
  background: var(--ink-primary); color: var(--surface);
  font-size: 0.8rem; padding: 3px 9px; border-radius: 6px; white-space: nowrap;
  transform: translate(-50%, -140%); z-index: 5;
}
.legend { display: flex; flex-wrap: wrap; gap: 14px; font-size: 0.85rem; color: var(--ink-secondary); margin: 8px 2px; }
.legend .sw { display: inline-block; width: 12px; height: 12px; margin-right: 5px; vertical-align: -1px; }
.legend .sw.s1 { background: var(--series-1); border-radius: 50%; }
.legend .sw.s2 { background: var(--series-2); }
.legend .sw.s3 { background: var(--series-3); clip-path: polygon(50% 0, 100% 100%, 0 100%); }
#nearestList { font-size: 0.92rem; margin-top: 10px; min-height: 1.6em; }
.vec-panel {
  background: var(--plane); border: 1px solid var(--grid); border-radius: 12px;
  padding: 14px; margin-top: 18px;
}
.vec-row { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; font-size: 1.05rem; }
.vec-row select {
  background: var(--surface); color: var(--ink-primary);
  border: 1px solid var(--axis); border-radius: 8px; padding: 6px 6px;
}
#vecResult { font-size: 1.35rem; font-weight: 700; }
#vecRanked { font-size: 0.85rem; color: var(--ink-secondary); margin-top: 6px; }

/* ========== §3 Attention ========== */
.tabs { display: flex; gap: 8px; margin-bottom: 12px; flex-wrap: wrap; }
.att-chip {
  border: 1px solid var(--border); border-radius: 6px;
  padding: 2px 8px 3px; margin: 2px; background: var(--surface); color: var(--ink-primary);
  display: inline-flex; flex-direction: column; align-items: center; line-height: 1.4;
  min-width: 2em;
}
.att-chip .w { font-size: 0.68rem; line-height: 1.1; min-height: 0.9em; opacity: 0.95; }
.att-chip.src { outline: 2px solid var(--series-2); outline-offset: 1px; font-weight: 700; }
#attHint { font-size: 0.85rem; color: var(--ink-muted); min-height: 1.5em; margin-top: 8px; }

/* ========== 棒グラフ（§4・§5・§6） ========== */
.bars { margin-top: 10px; }
.bar-row { display: flex; align-items: center; gap: 8px; margin: 7px 0; }
.bar-row .tk {
  flex: 0 0 5.2em; text-align: right; font-size: 0.95rem;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.bar-track { flex: 1 1 auto; position: relative; height: 26px; }
.bar-track::before {
  content: ""; position: absolute; inset: 0 0 0 0;
  border-left: 2px solid var(--axis);
}
.bar {
  position: absolute; left: 0; top: 2px; bottom: 2px;
  background: var(--series-1); border-radius: 0 4px 4px 0;
  transition: width 0.25s ease;
  min-width: 0;
}
.bar-lbl {
  position: absolute; top: 50%; transform: translateY(-50%);
  font-size: 0.8rem; font-weight: 600; white-space: nowrap; color: var(--ink-primary);
  transition: left 0.25s ease;
}
.bar-row.cut .tk { text-decoration: line-through; color: var(--ink-muted); }
.bar-row.cut .bar { background: var(--axis); }
.bar-row.cut .bar-lbl { color: var(--ink-muted); text-decoration: line-through; font-weight: 400; }
.cut-divider {
  border: none; border-top: 2px dashed var(--series-2);
  margin: 10px 0 2px; position: relative; overflow: visible;
}
.cut-divider::after {
  content: "ここで打ち切り"; position: absolute; right: 0; top: -0.7em;
  background: var(--surface); color: var(--series-2);
  font-size: 0.75rem; font-weight: 700; padding: 0 6px;
}
.sum-line { font-size: 0.8rem; color: var(--ink-muted); text-align: right; margin-top: 4px; }

/* ========== §4 ========== */
.prompt-row { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 14px; }
.temp-panel { display: flex; align-items: center; gap: 14px; margin: 10px 0 4px; flex-wrap: wrap; }
.temp-value {
  font-size: 2rem; font-weight: 800; min-width: 4.2em; text-align: center;
  background: var(--plane); border: 1px solid var(--grid); border-radius: 10px; padding: 2px 10px;
  font-variant-numeric: tabular-nums;
}
.temp-value .u { font-size: 0.8rem; font-weight: 600; color: var(--ink-muted); display: block; line-height: 1; padding-bottom: 4px; }
input[type="range"] { flex: 1 1 160px; accent-color: var(--series-1); min-height: 28px; }

/* ========== §5 ========== */
.strategy-row { display: flex; flex-wrap: wrap; gap: 4px 18px; margin: 8px 0; }
.strategy-row label { display: inline-flex; align-items: center; gap: 6px; cursor: pointer; }
.param-row { display: flex; align-items: center; gap: 10px; margin: 6px 0; flex-wrap: wrap; }
.param-row .pv { font-variant-numeric: tabular-nums; font-weight: 700; min-width: 4.5em; }
.param-row.dim { opacity: 0.45; }

/* ========== §6 ========== */
.gen-settings {
  font-size: 0.88rem; color: var(--ink-secondary); background: var(--plane);
  border: 1px solid var(--grid); border-radius: 10px; padding: 8px 12px; margin-bottom: 12px;
}
#genText {
  border: 1px dashed var(--grid); border-radius: 10px; padding: 12px;
  min-height: 3.4em; line-height: 2.3; word-break: break-all;
}
#genText .ctx { color: var(--ink-muted); }
#genText .tok.gen { background: var(--tint-3); border-color: var(--series-3); }
#genText .tok.last { outline: 2px solid var(--series-3); font-weight: 700; }
.gen-btns { display: flex; gap: 10px; margin: 14px 0; flex-wrap: wrap; }
#genEnd {
  display: none; margin: 10px 0; padding: 10px 14px; border-radius: 10px;
  background: var(--tint-2); border: 1px solid var(--series-2); font-weight: 600;
}
.retry-hint { font-size: 0.95rem; border-left: 3px solid var(--series-3); padding-left: 10px; }
#genHistory { margin-top: 14px; }
.hist-step {
  border: 1px solid var(--grid); border-radius: 10px; padding: 8px 12px; margin: 8px 0;
  background: var(--plane);
}
.hist-step h4 { margin: 0 0 4px; font-size: 0.82rem; color: var(--ink-muted); font-weight: 600; }
.hist-row { display: flex; align-items: center; gap: 8px; font-size: 0.82rem; margin: 2px 0; }
.hist-row .tk { flex: 0 0 4.5em; text-align: right; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.hist-row .htrack { flex: 1 1 auto; height: 10px; position: relative; }
.hist-row .hbar { position: absolute; left: 0; top: 0; bottom: 0; background: var(--series-1); border-radius: 0 2px 2px 0; }
.hist-row .hp { flex: 0 0 4.6em; font-variant-numeric: tabular-nums; color: var(--ink-secondary); }
.hist-row.chosen { font-weight: 700; }
.hist-row.chosen .hbar { background: var(--series-3); }
.hist-row.chosen .hp { color: var(--ink-primary); }
.hist-row .mark { flex: 0 0 1.1em; font-weight: 700; color: var(--series-3); }
.hist-row.cutrow { opacity: 0.5; }
.hist-row.cutrow .tk { text-decoration: line-through; }
.hist-row.cutrow .hbar { background: var(--axis); }

/* ========== §7 ========== */
.finale {
  font-size: clamp(1.15rem, 4vw, 1.6rem); font-weight: 800; text-align: center;
  margin: 26px 0 8px; line-height: 1.6;
}
footer { text-align: center; color: var(--ink-muted); font-size: 0.8rem; padding: 10px 14px 40px; }

@media (max-width: 480px) {
  section { padding: 18px 14px; }
  .bar-row .tk { flex-basis: 4.2em; font-size: 0.85rem; }
  .temp-value { font-size: 1.6rem; }
}