/* ============================================================
   Lowline pages (lowline.html / lowline-guide.html)
   アプリの見た目に合わせる：暗いグレーの地・アクセントは黄色1色・譜面は紙の色。
   ⚠️ body.ll-page の中だけに効かせる。index.html（サイト本体）の見た目は変えない。
   色の元はアプリの src/constants.js（U / C）。
   ============================================================ */

.ll-page {
  /* 地と面（アプリの U.bg / panel / well） */
  --bg:        #161616;
  --bg-2:      #1e1e1e;
  --bg-3:      #262626;
  --card:      #202020;
  --ink:       #ecebe8;
  --ink-soft:  #b9b7b2;
  --muted:     #8c8c8c;
  --faint:     #6e6e6e;
  --line:      #2b2b2b;
  --line-2:    #3a3a3a;
  --white:     #ffffff;

  /* アクセントは黄色だけ（U.acc / accBg / accEdge） */
  --acc:       #ffcc33;
  --acc-deep:  #ffd966;
  --acc-soft:  rgba(255, 204, 51, .28);
  --acc-tint:  #262110;
  --acc-edge:  #b8901a;
  --acc-text:  #1c1c1c;

  /* 譜面（C.paper ほか） */
  --paper:     #eeebe5;
  --paper-ink: #181714;
  --paper-sub: #72706a;
  --staff:     #a8a49b;
  --bar:       #7d7a73;
  --bar-hi:    #4f4c47;
  --sel:       #2f6db0;
  --sel-fill:  rgba(47, 109, 176, .13);
  --chroma:    #00B140;

  --shadow:    0 1px 0 rgba(255,255,255,.03) inset, 0 18px 40px rgba(0,0,0,.45);
  --shadow-sm: 0 1px 0 rgba(255,255,255,.03) inset, 0 8px 20px rgba(0,0,0,.35);

  --f-round: "Outfit", "Noto Sans JP", "Hiragino Kaku Gothic ProN", sans-serif;
  --f-mono:  "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --r:    6px;
  --r-lg: 10px;
  --ease: cubic-bezier(.2, .7, .2, 1);

  background: var(--bg);
  color: var(--ink);
  color-scheme: dark;
}
.ll-page ::selection { background: var(--acc); color: var(--acc-text); }

/* ---------- 見出し・ラベル ---------- */
.ll-page .eyebrow {
  font-family: var(--f-mono);
  font-weight: 600;
  font-size: 11.5px;
  letter-spacing: .2em;
  color: var(--acc);
}
/* 丸の代わりに「終止線」（細い線＋太い線）。ロゴの右端と同じ形 */
.ll-page .eyebrow::before {
  width: 7px; height: 14px;
  border: 0; border-radius: 0; box-shadow: none;
  background:
    linear-gradient(var(--acc), var(--acc)) left / 1.5px 100% no-repeat,
    linear-gradient(var(--acc), var(--acc)) right / 3.5px 100% no-repeat;
}
.ll-page .h-sec { font-weight: 700; letter-spacing: -.005em; }

/* ---------- ヘッダー・ボタン ---------- */
.ll-page .hdr { background: color-mix(in srgb, var(--bg) 82%, transparent); }
.ll-page .hdr.scrolled { border-bottom-color: var(--line); }
.ll-page .nav a { color: var(--ink-soft); }
.ll-page .nav a:hover, .ll-page .nav a[aria-current="page"] { color: var(--ink); }
.ll-page .nav a[aria-current="page"] { box-shadow: 0 2px 0 var(--acc); }
.ll-page .lang { border-color: var(--line-2); border-radius: 4px; padding: 2px; }
.ll-page .lang button { border-radius: 2px; font-family: var(--f-mono); }
.ll-page .lang button[aria-pressed="true"] { background: var(--acc); color: var(--acc-text); }
.ll-page .btn { border-radius: 4px; font-family: var(--f-round); }
.ll-page .btn--solid { background: var(--acc); color: var(--acc-text); box-shadow: 0 6px 18px rgba(255,204,51,.16); }
.ll-page .btn--solid:hover { background: var(--acc-deep); box-shadow: 0 8px 22px rgba(255,204,51,.26); }
.ll-page .foot { background: var(--bg); border-top: 1px solid var(--line); }
.ll-page .foot__bot { border-top-color: var(--line); }
.ll-page .foot__sns a { border-top-color: var(--line); }
.ll-page .foot__nav b, .ll-page .foot__sns b { font-family: var(--f-mono); }

/* メニューを2行に折らない（幅 800〜1000px で折れていた。トップページも同じ癖があるが、ここでは触らない） */
.ll-page .nav a { white-space: nowrap; }
@media (max-width: 1040px) {
  .ll-page .nav { gap: 18px; }
  .ll-page .brand small { display: none; }
}

/* スクロール位置 = 再生位置。上端を黄色い線が進む */
.ll-progress {
  position: fixed; left: 0; top: 0; z-index: 70;
  height: 2px; width: 100%;
  background: var(--acc);
  transform-origin: 0 50%;
  transform: scaleX(var(--ll-scroll, 0));
  box-shadow: 0 0 10px rgba(255,204,51,.6);
  pointer-events: none;
}

/* ---------- 流れ込む表示（譜面が横に流れる向き） ---------- */
/* 右から流れ込む途中の部品で、スマホの画面が横に広がらないように（トップページの home.css と同じ） */
.ll-page main { overflow-x: clip; }
.ll-page .reveal {
  transform: translateX(28px);
  transition: opacity .8s var(--ease), transform .8s var(--ease);
}
.ll-page .reveal.in { transform: none; }
.ll-page .ll-tags.reveal li,
.ll-page .ll-feats > .reveal,
.ll-page .ll-more li,
.ll-page .g-toc.reveal a {
  transition-delay: calc(var(--i, 0) * 55ms);
}
.ll-page .ll-tags.reveal li,
.ll-page .g-toc.reveal a {
  opacity: 0; transform: translateX(16px);
  transition-property: opacity, transform, border-color, color, background;
  transition-duration: .6s; transition-timing-function: var(--ease);
}
.ll-page .ll-tags.reveal.in li,
.ll-page .g-toc.reveal.in a { opacity: 1; transform: none; }

/* ============================================================
   販売ページ
   ============================================================ */
.ll-page .ll-hero {
  position: relative;
  overflow: hidden;
  padding-bottom: 40px;
}
/* 背景にうっすら弦（5本）。奥行きだけ出す */
.ll-page .ll-hero::before {
  content: "";
  position: absolute; inset: 0;
  background:
    radial-gradient(60% 50% at 70% 62%, rgba(255,204,51,.07), transparent 70%),
    repeating-linear-gradient(to bottom, transparent 0 37px, rgba(255,255,255,.035) 37px 38px);
  -webkit-mask-image: linear-gradient(to bottom, transparent, #000 25%, #000 75%, transparent);
          mask-image: linear-gradient(to bottom, transparent, #000 25%, #000 75%, transparent);
  pointer-events: none;
}
.ll-page .ll-hero .wrap { position: relative; }
.ll-page .ll-mark__icon { border-radius: 12px; box-shadow: 0 0 0 1px var(--line-2), 0 8px 24px rgba(0,0,0,.5); }
.ll-page .ll-logo img,
.ll-page .ll-close__logo { filter: invert(1); }   /* 黒1色のロゴを白に */
.ll-page .ll-lead { font-family: "Noto Sans JP", var(--f-round); font-weight: 700; }
.ll-page .ll-sub { color: var(--ink-soft); }

/* お試し版への入口 */
.ll-cta { margin: 28px 0 0; display: flex; flex-wrap: wrap; align-items: center; gap: 12px 18px; }
.ll-cta .btn { padding: 11px 20px; }
.ll-cta__note { font-size: 13.5px; line-height: 1.8; color: var(--muted); max-width: 30em; }

/* 一番上（ロゴ・キャッチコピー・ボタン）は画面の中央に */
.ll-page .ll-hero .wrap > :not(.ll-stage) { margin-left: auto; margin-right: auto; text-align: center; }
.ll-page .ll-mark { justify-content: center; }
.ll-page .ll-logo img { margin: 0 auto; }
.ll-page .ll-lead, .ll-page .ll-sub { max-width: 36em; }
.ll-page .ll-cta { justify-content: center; }
.ll-page .ll-cta__note { flex-basis: 100%; max-width: none; text-align: center; }
.ll-page .ll-cta .btn--ghost { border-radius: 4px; border: 1px solid var(--line-2); background: transparent; color: var(--ink); }
.ll-page .ll-cta .btn--ghost:hover { border-color: var(--acc-edge); color: var(--acc); }
/* 購入の節のボタン */
.ll-buy { margin: 30px 0 0; display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; }
.ll-buy .btn { padding: 14px 32px; font-size: 15px; }
.ll-page .g-hero .g-note { text-align: left; }

/* 動く TAB（ヒーロー） */
.ll-stage {
  margin: 44px 0 0;
  padding: 14px 14px 12px;
  border-radius: var(--r-lg);
  background: #202020;
  border: 1px solid var(--line-2);
  box-shadow: var(--shadow);
}
.ll-stage__bar {
  display: flex; align-items: center; gap: 8px;
  margin: 0 2px 12px;
  font-family: var(--f-mono); font-size: 11px; letter-spacing: .08em; color: var(--muted);
}
.ll-stage__dots { display: flex; gap: 6px; margin-right: 8px; }
.ll-stage__dots i { width: 10px; height: 10px; border-radius: 50%; background: #3a3a3a; }
.ll-stage__title { flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.ll-stage__bpm { color: var(--ink-soft); }
/* 音のボタン（押すまで鳴らない） */
.ll-stage__sound {
  display: inline-flex; align-items: center; gap: 6px;
  margin-right: 10px; padding: 4px 10px 4px 8px;
  border: 1px solid var(--line-2); border-radius: 4px;
  font: 600 11px var(--f-mono); letter-spacing: .04em; color: var(--ink);
  background: #2a2a2a;
  transition: background .15s ease, color .15s ease, border-color .15s ease;
}
.ll-stage__sound:hover { border-color: var(--acc-edge); }
.ll-stage__sound svg { display: block; flex: none; width: 14px; height: 14px; }
.ll-stage__sound span { white-space: nowrap; }
.ll-stage__sound .wave { opacity: 0; transition: opacity .15s; }
.ll-stage__sound[aria-pressed="true"] { background: var(--acc); color: var(--acc-text); border-color: var(--acc); }
.ll-stage__sound[aria-pressed="true"] .wave { opacity: 1; }
.ll-stage__sound[aria-pressed="true"] .mute { opacity: 0; }
.ll-stage__bpm b { color: var(--acc); font-weight: 600; }
.ll-stage__paper {
  position: relative;
  border-radius: 3px;
  background: var(--paper);
  box-shadow: 0 0 0 1px #0f0f0f;
  overflow: hidden;
}
.ll-stage__paper svg { display: block; width: 100%; height: auto; }
.ll-stage__keys {
  display: flex; align-items: center; gap: 10px;
  min-height: 34px; margin: 12px 2px 0;
  font-size: 12.5px; color: var(--muted);
}
.ll-page .ll-stage__keys kbd {
  min-width: 26px; padding: 3px 8px; margin: 0;
  border: 0; border-radius: 4px;
  background: var(--acc); color: var(--acc-text);
  box-shadow: inset 0 -2px 0 rgba(0,0,0,.25);
  font-family: var(--f-mono); font-size: 13px; font-weight: 600;
}
.ll-stage__keys kbd.hit { animation: llKey .2s ease-out; }
.ll-stage__keys .lbl { transition: opacity .2s; }
@keyframes llKey { 0% { transform: translateY(2px); filter: brightness(.8); } 100% { transform: none; } }

/* SVG の中身 */
.lls-str { stroke: var(--staff); stroke-width: 1.2; }
.lls-str.pluck { animation: llPluck .42s ease-out; }
.lls-beat { stroke: #cdc9c0; stroke-width: 1; }
.lls-barl { stroke: var(--bar); stroke-width: 1.4; }
.lls-edge { stroke: var(--bar-hi); stroke-width: 2.2; }
.lls-lbl { fill: var(--paper-sub); font: 600 13px var(--f-mono); }
.lls-mno { fill: var(--paper-sub); font: 600 11px var(--f-mono); }
.lls-note { opacity: 0; transform-box: fill-box; transform-origin: 50% 50%; }
.lls-note.show { opacity: 1; }
.lls-note.on { animation: llPop .28s var(--ease); }
.lls-note.off { opacity: 1; animation: llFade .5s ease forwards; }
.lls-note rect { fill: var(--paper); }
.lls-note text { fill: var(--paper-ink); font: 700 19px "Helvetica Neue", Arial, sans-serif; text-anchor: middle; dominant-baseline: central; }
.lls-note.hit rect { animation: llHit .5s ease-out; }
.lls-tech { fill: var(--paper-sub); font: 700 12px "Helvetica Neue", Arial, sans-serif; text-anchor: middle; opacity: 0; transition: opacity .25s; }
.lls-tech.on { opacity: 1; }
.lls-arc { fill: none; stroke: var(--paper-ink); stroke-width: 1.4; opacity: 0; transition: opacity .25s; }
.lls-arc.on { opacity: 1; }
.lls-cur { fill: var(--sel-fill); stroke: var(--sel); stroke-width: 1.6; transition: transform .2s var(--ease), opacity .25s; }
.lls-head { transition: opacity .3s; }
.lls-head line { stroke: var(--acc); stroke-width: 2.5; }
.lls-head rect { fill: rgba(255,204,51,.22); }
@keyframes llPop { 0% { opacity: 0; transform: scale(1.5); } 100% { opacity: 1; transform: none; } }
@keyframes llFade { to { opacity: 0; } }
@keyframes llHit { 0% { fill: var(--acc); } 100% { fill: var(--paper); } }
@keyframes llPluck {
  0% { transform: translateY(0); stroke: var(--paper-ink); }
  25% { transform: translateY(1.4px); }
  50% { transform: translateY(-1px); }
  75% { transform: translateY(.5px); }
  100% { transform: none; stroke: var(--staff); }
}

/* 画面写真は窓の枠に入れる */
.ll-page .ll-shot {
  margin: 34px 0 0;
  border: 1px solid var(--line-2);
  border-radius: var(--r-lg);
  background: #202020;
  box-shadow: var(--shadow);
}
.ll-page .ll-shot figcaption {
  padding: 10px 14px;
  font-family: var(--f-mono); font-size: 11px; letter-spacing: .06em; color: var(--muted);
  border-top: 1px solid var(--line-2);
}

.ll-page .ll-prose p { color: var(--ink-soft); }
.ll-page .ll-tags li {
  border-radius: 4px;
  background: var(--card);
  border-color: var(--line-2);
  color: var(--ink);
}
.ll-page .ll-tags li:hover { border-color: var(--acc-edge); color: var(--acc); }

/* 機能カード */
.ll-page .ll-feat {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: opacity .8s var(--ease), transform .8s var(--ease), border-color .25s ease;
}
.ll-page .ll-feat.in:hover { border-color: var(--acc-edge); transform: translateY(-3px); transition-delay: 0s; }
.ll-page .ll-feat__no { font-family: var(--f-mono); font-weight: 600; font-size: 13px; letter-spacing: .1em; margin-bottom: 10px; }
.ll-page .ll-feat__no::before { content: "M"; opacity: .55; }   /* 小節番号の書き方 */
.ll-page .ll-feat h3 { font-family: "Noto Sans JP", var(--f-round); }
.ll-page .ll-feat p { color: var(--ink-soft); }
.ll-page .ll-feat .ll-feat__note { color: var(--muted); }
.ll-page .ll-chips { flex-wrap: wrap; }
.ll-page .ll-chips li {
  font-family: var(--f-mono); font-weight: 600; font-size: 11.5px;
  border-radius: 3px;
  background: var(--acc-tint);
  border-color: rgba(255,204,51,.22);
  color: var(--acc);
  white-space: nowrap;
}

/* カードの頭の小さな絵（JS が中身を作る） */
.ll-viz {
  position: relative;
  height: 108px;
  margin: -26px -24px 22px;
  background: #1a1a1a;
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}
.ll-viz:empty { display: none; }

/* 01: 波形 → フレット番号 */
.ll-viz--wave { display: flex; align-items: center; gap: 3px; padding: 0 22px; }
.ll-viz--wave i {
  flex: 1; min-width: 2px; border-radius: 1px;
  height: calc(var(--h) * 1%);
  background: #4a4a4a;
  animation: llWave 6s linear infinite;
  animation-delay: calc(var(--x) * 3.2s);
}
.ll-viz--wave b {
  position: absolute; top: 12px;
  left: calc(22px + var(--x) * (100% - 44px));
  transform: translateX(-50%);
  font: 600 12px var(--f-mono); color: var(--acc-text);
  background: var(--acc); border-radius: 3px; padding: 1px 5px;
  opacity: 0;
  animation: llFret 6s ease-out infinite;
  animation-delay: calc(var(--x) * 3.2s);
}
.ll-viz--wave::after {
  content: ""; position: absolute; top: 0; bottom: 0; width: 2px; left: 22px;
  background: var(--acc); box-shadow: 0 0 12px rgba(255,204,51,.7);
  animation: llScan 6s linear infinite;
}
/* 読み取り線が通った瞬間から少しの間だけ明るくなる */
@keyframes llWave { 0% { background: var(--acc-edge); } 30% { background: #7a7a7a; } 55%, 100% { background: #4a4a4a; } }
@keyframes llScan { 0% { transform: translateX(0); opacity: 1; } 53% { transform: translateX(calc(var(--scan-w, 300px))); opacity: 1; } 54%, 100% { opacity: 0; } }
@keyframes llFret {
  0% { opacity: 0; transform: translate(-50%, 6px); }
  3% { opacity: 1; transform: translate(-50%, 0); }
  80% { opacity: 1; transform: translate(-50%, 0); }
  90%, 100% { opacity: 0; }
}

/* 02: 書き出す動画（緑の地に白い TAB が流れる） */
.ll-viz--video { background: var(--chroma); }
.ll-viz--video .strip {
  position: absolute; top: 0; left: 0; height: 100%;
  display: flex; width: max-content;
  animation: llStrip 9s linear infinite;
}
.ll-viz--video svg { height: 100%; width: auto; display: block; }
.ll-viz--video::after {
  content: ""; position: absolute; top: 14px; bottom: 14px; left: 30%;
  width: 2px; background: rgba(255,255,255,.85);
}
.ll-viz--video .tag {
  position: absolute; right: 10px; bottom: 8px; z-index: 1;
  font: 600 10px var(--f-mono); letter-spacing: .08em; color: rgba(255,255,255,.9);
}
@keyframes llStrip { to { transform: translateX(-50%); } }

/* 03: ライブラリと自動保存 */
.ll-viz--lib { display: flex; align-items: center; gap: 18px; padding: 0 22px; }
.ll-viz--lib ul { flex: 1; display: grid; gap: 5px; }
.ll-viz--lib li {
  display: flex; justify-content: space-between; gap: 10px;
  padding: 5px 9px; border-radius: 3px;
  font: 500 11.5px var(--f-mono); color: var(--ink-soft);
  background: #222; border: 1px solid var(--line);
  animation: llRow 7.5s ease infinite;
  animation-delay: calc(var(--i) * 2.5s);
}
.ll-viz--lib li span { color: var(--faint); }
@keyframes llRow {
  0%, 30%, 100% { border-color: var(--line); background: #222; }
  6%, 22% { border-color: var(--sel); background: #1d2633; }
}
.ll-viz--lib .ring {
  flex: none; width: 54px; height: 54px; border-radius: 50%;
  display: grid; place-items: center;
  background: conic-gradient(var(--acc) calc(var(--p, 0) * 1turn), #333 0);
  font: 600 9.5px var(--f-mono); color: var(--ink-soft); letter-spacing: .04em;
  position: relative;
}
.ll-viz--lib .ring::before { content: ""; position: absolute; inset: 4px; border-radius: 50%; background: #1a1a1a; }
.ll-viz--lib .ring span { position: relative; text-align: center; line-height: 1.25; }

/* 04: 音色とメーター */
.ll-viz--tone { display: flex; align-items: center; justify-content: center; gap: 26px; }
.ll-viz--tone .seg { display: flex; border: 1px solid var(--line-2); border-radius: 4px; padding: 2px; gap: 2px; }
.ll-viz--tone .seg span {
  font: 600 11px var(--f-mono); padding: 4px 10px; border-radius: 2px; color: var(--muted);
  animation: llSeg 6s steps(1) infinite;
}
.ll-viz--tone .seg span + span { animation-delay: -3s; }
@keyframes llSeg { 0% { background: var(--acc); color: var(--acc-text); } 50% { background: transparent; color: var(--muted); } }
.ll-viz--tone .meters { display: flex; gap: 4px; height: 70px; align-items: flex-end; }
.ll-viz--tone .meters i {
  width: 9px; height: 100%;
  background: linear-gradient(to top, #5b8a3a 0 62%, var(--acc) 62% 86%, #e08b2c 86%);
  -webkit-mask-image: repeating-linear-gradient(to top, #000 0 4px, transparent 4px 6px);
          mask-image: repeating-linear-gradient(to top, #000 0 4px, transparent 4px 6px);
  clip-path: inset(calc(100% - var(--lv, 40%)) 0 0 0);
  transition: clip-path .09s linear;
}

/* ほかにも */
.ll-page .ll-more { background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--r-lg); }
.ll-page .ll-more li { color: var(--ink-soft); }
.ll-page .ll-more li::before { border-radius: 0; width: 5px; height: 5px; }

/* 締め：ロゴの上を再生線が1回通る */
.ll-page .ll-close__logo { width: min(360px, 76%); }
.ll-close__sweep { position: relative; display: inline-block; }
.ll-close__sweep::after {
  content: ""; position: absolute; top: -10%; bottom: -10%; left: 0; width: 3px;
  background: var(--acc); box-shadow: 0 0 16px rgba(255,204,51,.8);
  opacity: 0;
}
.ll-close__sweep.in::after { animation: llSweep 2.2s var(--ease) .3s 1 forwards; }
@keyframes llSweep { 0% { left: 0; opacity: 0; } 8% { opacity: 1; } 88% { opacity: 1; } 100% { left: 100%; opacity: 0; } }

/* 仕様・流れ・よくある質問 */
.ll-page .ll-spec { border-top-color: var(--line); }
.ll-page .ll-spec dt, .ll-page .ll-spec dd { border-bottom-color: var(--line); }
.ll-page .ll-price { font-family: var(--f-round); color: var(--acc); font-size: 24px; }
.ll-page .ll-mail { color: var(--acc); }
.ll-page .ll-flow li { background: var(--card); border-color: var(--line); border-radius: var(--r); }
.ll-page .ll-flow li::before { border-radius: 3px; color: var(--acc-text); font-family: var(--f-mono); }
.ll-page .ll-qa, .ll-page .ll-qa dd { border-color: var(--line); }
.ll-page .ll-soon { color: var(--ink-soft); padding: 12px 16px; border-left: 3px solid var(--acc); background: var(--acc-tint); border-radius: 0 var(--r) var(--r) 0; }

/* ============================================================
   使い方ガイド
   ============================================================ */
.ll-page .g-toc a { background: var(--card); border-color: var(--line); border-radius: var(--r); }
.ll-page .g-toc a:hover { border-color: var(--acc-edge); }
.ll-page .g-toc span { border-radius: 3px; background: var(--acc-tint); color: var(--acc); font-family: var(--f-mono); }
.ll-page .g-list li::before { border-radius: 0; width: 5px; height: 5px; }
.ll-page .g-list--num li::before { width: auto; height: auto; font-family: var(--f-mono); }
.ll-page .g-box { background: var(--card); border: 1px solid var(--line); border-left: 3px solid var(--acc); border-radius: 0 var(--r) var(--r) 0; }
.ll-page .g-box h3 { color: var(--acc); }
.ll-page .g-shot img, .ll-page .g-side img { border-color: var(--line-2); border-radius: var(--r); }
.ll-page .g-keys { border-top-color: var(--line); }
.ll-page .g-keys dt, .ll-page .g-keys dd { border-bottom-color: var(--line); transition: background .2s ease; }
/* 行に触れると、アプリのカーソルと同じ青で選ばれる */
.ll-page .g-keys dt:hover, .ll-page .g-keys dt:hover + dd,
.ll-page .g-keys dd:has(+ dt:hover) { background: var(--sel-fill); }
.ll-page kbd {
  border-radius: 4px;
  background: #2a2a2a; border-color: #444; box-shadow: 0 2px 0 #0f0f0f;
  color: var(--ink); font-family: var(--f-mono);
  transition: transform .1s ease, box-shadow .1s ease, background .15s ease, color .15s ease;
}
.ll-page .g-keys dt:hover kbd { background: var(--acc); color: var(--acc-text); border-color: var(--acc); transform: translateY(1px); box-shadow: 0 1px 0 #0f0f0f; }
.ll-page .g-back a { color: var(--acc); }

@media (max-width: 640px) {
  .ll-stage { margin-top: 30px; padding: 10px 10px 8px; }
  .ll-stage__bar { margin-bottom: 10px; }
  .ll-viz { margin: -26px -24px 20px; }
}

/* ============================================================
   文字組み：見出しは控えめに、本文は読みやすく
   ============================================================ */
/* 日本語を文節の途中で折り返さない（Chrome / Edge）。行末に1〜2文字だけ残る改行も避ける */
.ll-page :is(p, li, dt, dd, h1, h2, h3, figcaption) { word-break: auto-phrase; text-wrap: pretty; }
.ll-page :is(h1, h2, h3, .ll-lead, .ll-close__lead) { text-wrap: balance; }

.ll-page .eyebrow { color: var(--muted); font-weight: 500; letter-spacing: .16em; }
.ll-page .eyebrow::before { opacity: .7; background:
    linear-gradient(var(--muted), var(--muted)) left / 1.5px 100% no-repeat,
    linear-gradient(var(--muted), var(--muted)) right / 3.5px 100% no-repeat; }
.ll-page .h-sec {
  font-family: "Noto Sans JP", var(--f-round);
  font-size: clamp(21px, 2.1vw, 27px);
  font-weight: 500;
  line-height: 1.55;
  letter-spacing: .02em;
  margin-bottom: 22px;
}
.ll-page .ll-lead { font-size: clamp(18px, 1.9vw, 23px); font-weight: 500; letter-spacing: .02em; }
.ll-page .ll-sub { font-size: 15.5px; }
.ll-page .ll-prose p { font-size: 16px; line-height: 2.05; }
.ll-page .ll-feat h3 { font-size: 16.5px; font-weight: 500; }
.ll-page .ll-sub-h { font-family: "Noto Sans JP", var(--f-round); font-weight: 500; font-size: 16px; color: var(--ink); }
.ll-page .ll-close__lead { font-family: "Noto Sans JP", var(--f-round); font-weight: 500; font-size: clamp(19px, 2.2vw, 26px); line-height: 1.8; }
.ll-page .g-box h3 { font-family: "Noto Sans JP", var(--f-round); font-weight: 500; }

/* ============================================================
   レイアウト
   すべて画面中央の1本の列（720px）に揃える。
   節の名前・見出し・短い説明文は中央揃え。表・手順・質問は列の中で左揃え。
   画面写真・動く TAB・機能カードだけ広い幅（--maxw）で、これも中央。
   ============================================================ */
.ll-page { --maxw: 1200px; --col: 720px; }

/* 節の頭（名前＋見出し）は中央 */
.ll-page .ll-sec .eyebrow,
.ll-page .g-sec .eyebrow { display: flex; justify-content: center; }
.ll-page .ll-sec .h-sec,
.ll-page .g-sec .h-sec { text-align: center; }
/* 短い説明文とタグも中央（コンセプト・エディターの節） */
.ll-page .ll-sec .ll-prose { text-align: center; }
.ll-page .ll-sec .ll-tags { justify-content: center; }
.ll-page .ll-sec .g-back,
.ll-page .g-sec .g-back { text-align: center; }

/* 本文の列 */
.ll-sec > .wrap { max-width: var(--maxw); }
.ll-sec > .wrap > * { max-width: var(--col); margin-left: auto; margin-right: auto; }
.ll-sec > .wrap > :is(.ll-shot, .ll-feats, .ll-more) { max-width: none; }
.ll-sec > .wrap > .eyebrow { display: flex; width: max-content; }

/* ガイドの左の目次は、広い画面だけ（上の目次は狭い画面用） */
.g-rail { display: none; }

@media (min-width: 1000px) {
  .ll-page .ll-hero { padding-top: 112px; }
  .ll-page .ll-stage { margin-top: 56px; padding: 18px 18px 14px; }
  .ll-page .ll-stage__keys { font-size: 13.5px; }

  .ll-sec > .wrap > .ll-shot { margin-top: 48px; }
  .ll-page .ll-feats { gap: 20px; margin-top: 32px; }
  .ll-page .ll-feat { padding: 28px 30px; }
  .ll-page .ll-viz { height: 132px; margin: -28px -30px 24px; }
  .ll-page .ll-more { margin-top: 20px; padding: 24px 30px; }
  .ll-page .ll-more ul { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .ll-page .ll-close { padding: 110px 0; }
  .ll-sec > .wrap > .g-back { margin-top: 44px; }

  /* ---- ガイド：本文の列を中央に。画面写真も同じ列の幅 ---- */
  .ll-page .g-main .wrap.narrow,
  .ll-page .g-hero .wrap.narrow { max-width: calc(var(--col) + 2 * var(--gut)); }
  .ll-page .g-sec { padding-top: 64px; }
  .ll-page .g-keys--2 { column-gap: 0; }
  .ll-page .g-shot { margin-top: 32px; }
}

/* 中央の列の左に目次が収まる広さのときだけ、目次を左に固定 */
@media (min-width: 1400px) {
  .g-layout { position: relative; }
  .g-rail {
    display: block;
    position: absolute; top: 0; bottom: 0;
    right: calc(50% + var(--col) / 2 + 56px);
    width: 220px;
  }
  .ll-page .g-hero .g-toc { display: none; }
  .g-rail nav {
    position: sticky; top: 100px;
    display: grid; gap: 2px;
    padding: 72px 0 40px;
  }
  .g-rail a {
    display: flex; gap: 12px; align-items: baseline;
    padding: 8px 12px;
    border-left: 2px solid var(--line-2);
    color: var(--muted);
    font-size: 13.5px; line-height: 1.6;
    transition: color .2s ease, border-color .2s ease, background .2s ease;
  }
  .g-rail a span { font-family: var(--f-mono); font-size: 11.5px; color: var(--faint); }
  .g-rail a b { font-weight: 500; }
  .g-rail a:hover { color: var(--ink); }
  /* 今読んでいる所に、再生線と同じ黄色の印 */
  .g-rail a[aria-current="true"] { color: var(--ink); border-left-color: var(--acc); background: linear-gradient(90deg, rgba(255,204,51,.07), transparent); }
  .g-rail a[aria-current="true"] span { color: var(--acc); }
}

@media (min-width: 1280px) {
  .ll-page .ll-hero { padding-top: 124px; padding-bottom: 56px; }
}

/* 動きを減らす設定の人には、止まった絵だけ出す */
@media (prefers-reduced-motion: reduce) {
  .ll-page .reveal, .ll-page .ll-tags.reveal li, .ll-page .g-toc.reveal a { opacity: 1; transform: none; transition: none; }
  .ll-progress { display: none; }
  .ll-viz *, .ll-viz::after, .ll-close__sweep::after { animation: none !important; }
  .ll-viz--wave b { opacity: 1; }
  .ll-viz--wave::after { display: none; }
  .lls-note { opacity: 1; }
}

/* ============================================================
   規約と表記（lowline-legal.html）・フッターの規約リンク
   ============================================================ */
/* 左の目次が無いページなので、上の目次を広い画面でも出す（ガイドは 1400px 以上で隠す） */
@media (min-width: 1400px) { .ll-page .lg-hero .g-toc { display: grid; } }
.ll-page .lg-date { text-align: center; }
/* 購入ボタンの下の一言（規約へのリンク） */
.ll-page .ll-buy-legal { text-align: center; margin-top: 14px; }
/* フッターの右に、規約へのリンク（全ページ共通） */
.ll-page .foot__legal { display: flex; flex-wrap: wrap; gap: 4px 18px; }
.ll-page .foot__legal a { color: var(--muted); transition: color .2s ease; }
.ll-page .foot__legal a:hover { color: var(--acc); }