:root {
  color-scheme: light dark;
  --syk-toolbar-height: 54px;
  --syk-footer-height: 68px;
  --syk-safe-top: env(safe-area-inset-top, 0px);
  --syk-safe-bottom: env(safe-area-inset-bottom, 0px);
  font-family:
    -apple-system, BlinkMacSystemFont, "Yu Gothic", YuGothic,
    "Hiragino Kaku Gothic ProN", sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
}

body.syk-reader {
  background: #f6f3ed;
  color: #24211c;
  -webkit-user-select: none;
  user-select: none;
}

button,
input,
select,
a {
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

.syk-reader__app {
  --syk-chrome-bg: rgba(255, 253, 249, 0.96);
  --syk-chrome-text: #24211c;
  --syk-chrome-border: #d8d1c5;
  --syk-accent: #6b4a1e;
  --syk-page-bg: #fffdf9;
  --syk-stage-bg: #f6f3ed;
  position: fixed;
  inset: 0;
  display: grid;
  /* 列を minmax(0, 1fr) にしないと、暗黙の auto 列が max-content になり、
     長い書名のぶんヘッダーが横に伸びて右側のボタンが画面外へ出てしまう。 */
  grid-template-columns: minmax(0, 1fr);
  grid-template-rows:
    calc(var(--syk-toolbar-height) + var(--syk-safe-top))
    minmax(0, 1fr)
    calc(var(--syk-footer-height) + var(--syk-safe-bottom));
  background: #f6f3ed;
}

.syk-reader__app[data-theme="sepia"] {
  --syk-chrome-bg: rgba(237, 224, 197, 0.97);
  --syk-chrome-text: #352d21;
  --syk-chrome-border: #cdbd9e;
  --syk-accent: #6d4b1e;
  --syk-page-bg: #f1e5ca;
  --syk-stage-bg: #e7dcc4;
  background: #e7dcc4;
}

.syk-reader__app[data-theme="dark"] {
  --syk-chrome-bg: rgba(26, 28, 31, 0.97);
  --syk-chrome-text: #e8e3d9;
  --syk-chrome-border: #44474b;
  --syk-accent: #d9bd83;
  --syk-page-bg: #17191c;
  --syk-stage-bg: #111316;
  background: #111316;
}

.syk-reader__header,
.syk-reader__footer {
  z-index: 30;
  display: flex;
  min-width: 0;
  align-items: center;
  color: var(--syk-chrome-text);
  background: var(--syk-chrome-bg);
  border-color: var(--syk-chrome-border);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.syk-reader__header {
  gap: 6px;
  padding: var(--syk-safe-top) max(10px, env(safe-area-inset-right)) 0
    max(10px, env(safe-area-inset-left));
  border-bottom: 1px solid var(--syk-chrome-border);
}

.syk-reader__footer {
  flex-direction: row;
  justify-content: center;
  gap: clamp(10px, 2vw, 24px);
  padding: 0 max(16px, env(safe-area-inset-right)) var(--syk-safe-bottom)
    max(12px, env(safe-area-inset-left));
  border-top: 1px solid var(--syk-chrome-border);
}

.syk-reader__footer-nav {
  display: contents;
}

.syk-reader__page-jump {
  display: flex;
  align-items: center;
  width: auto;
  max-width: 720px;
  height: 32px;
  flex: 1 1 420px;
  order: 3;
}

.syk-reader__page-jump input {
  width: 100%;
  height: 24px;
  margin: 0;
  accent-color: var(--syk-accent);
  cursor: pointer;
}

.syk-reader__page-jump input:disabled {
  cursor: wait;
  opacity: 0.35;
}

.syk-reader__app.is-rtl .syk-reader__page-jump input {
  direction: rtl;
}

.syk-icon-button,
.syk-reader__footer button,
.syk-drawer-close {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  padding: 0 10px;
  color: var(--syk-chrome-text);
  background: transparent;
  border: 0;
  border-radius: 8px;
  text-decoration: none;
  cursor: pointer;
}

.syk-icon-button:hover,
.syk-icon-button:focus-visible,
.syk-reader__footer button:hover,
.syk-reader__footer button:focus-visible {
  color: var(--syk-accent);
  background: color-mix(in srgb, var(--syk-accent) 10%, transparent);
  outline: none;
}

/* 引き出しを閉じるボタン。丸い下地を敷いて、押せることが一目で分かるようにする。 */
.syk-drawer-close {
  position: relative;
  min-width: 44px;
  min-height: 44px;
  padding: 0;
  color: transparent;
  font-size: 0;
}

.syk-drawer-close::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 32px;
  height: 32px;
  background: color-mix(in srgb, var(--syk-chrome-text) 9%, transparent);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: background 0.15s ease;
}

.syk-drawer-close::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 13px;
  height: 13px;
  background:
    linear-gradient(currentColor, currentColor) center / 100% 2px no-repeat,
    linear-gradient(currentColor, currentColor) center / 2px 100% no-repeat;
  color: var(--syk-chrome-text);
  transform: translate(-50%, -50%) rotate(45deg);
}

.syk-drawer-close:hover::before,
.syk-drawer-close:focus-visible::before {
  background: color-mix(in srgb, var(--syk-accent) 20%, transparent);
}

.syk-drawer-close:hover::after,
.syk-drawer-close:focus-visible::after {
  color: var(--syk-accent);
}

.syk-drawer-close:focus-visible {
  outline: none;
}

/* 出版社の印。押せるものではないので、指も目も邪魔しない置き方にする。 */
.syk-reader__logo {
  width: auto;
  height: 22px;
  flex: 0 0 auto;
  margin-left: 2px;
  opacity: 0.92;
  pointer-events: none;
  user-select: none;
}

.syk-reader__book-info {
  min-width: 0;
  flex: 1;
  text-align: center;
}

.syk-reader__book-info strong {
  display: block;
  overflow: hidden;
  font-family: "Yu Mincho", YuMincho, "Hiragino Mincho ProN", serif;
  font-size: 15px;
  line-height: 1.35;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.syk-reader__mode-label {
  display: block;
  min-height: 14px;
  color: color-mix(in srgb, var(--syk-chrome-text) 68%, transparent);
  font-size: 10px;
  line-height: 1.3;
}

.syk-reader__close {
  font-size: 28px;
  font-weight: 300;
}

.syk-reader__search-toggle svg {
  width: 21px;
  height: 21px;
  overflow: visible;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-width: 1.8;
}

.syk-reader__stage {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 0;
  min-height: 0;
  padding: clamp(10px, 1.2vh, 16px) 20px;
  overflow: hidden;
}

.syk-reader__viewer {
  position: relative;
  width: auto;
  height: min(100%, 94vh);
  max-width: min(840px, 100%);
  max-height: 94vh;
  aspect-ratio: 1 / 1.414;
  flex: 0 0 auto;
  padding:
    calc(clamp(4px, 0.8vw, 10px) + 16px)
    clamp(4px, 0.8vw, 10px)
    calc(clamp(4px, 0.8vw, 10px) + 8px);
  overflow: hidden;
  background: var(--syk-page-bg);
  border: 1px solid color-mix(in srgb, var(--syk-chrome-border) 78%, transparent);
  box-shadow: 0 8px 32px rgba(42, 33, 22, 0.16);
}

.syk-reader__viewer iframe {
  background: transparent;
  border: 0;
}

.syk-reader__loading,
.syk-reader__error {
  position: absolute;
  inset: 0;
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 24px;
  color: var(--syk-chrome-text);
  background: var(--syk-stage-bg);
  text-align: center;
}

.syk-reader__app.is-recalculating .syk-reader__viewer {
  visibility: hidden;
}

.syk-reader__viewer::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 8;
  background: var(--syk-page-bg);
  opacity: 0;
  pointer-events: none;
  transition: opacity 120ms ease-out;
}

.syk-reader__app.is-section-transitioning .syk-reader__viewer::after {
  opacity: 1;
  transition-duration: 0ms;
}

.syk-reader__stage::before,
.syk-reader__stage::after {
  position: absolute;
  z-index: 9;
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
  transition: opacity 100ms ease-out;
}

.syk-reader__stage::before {
  content: "";
  top: calc(50% - 31px);
  left: calc(50% - 17px);
  width: 34px;
  height: 34px;
  border: 3px solid color-mix(in srgb, var(--syk-accent) 25%, transparent);
  border-top-color: var(--syk-accent);
  border-radius: 50%;
  animation: syk-reader-spin 0.8s linear infinite;
}

.syk-reader__stage::after {
  content: "読み込み中";
  top: calc(50% + 18px);
  left: 50%;
  color: var(--syk-chrome-text);
  font-size: 13px;
  line-height: 1;
  white-space: nowrap;
  transform: translateX(-50%);
}

.syk-reader__app.is-section-transition-waiting .syk-reader__stage::before,
.syk-reader__app.is-section-transition-waiting .syk-reader__stage::after {
  visibility: visible;
  opacity: 1;
}

.syk-reader__loading[hidden],
.syk-reader__error[hidden] {
  display: none;
}

.syk-reader__spinner {
  width: 34px;
  height: 34px;
  border: 3px solid color-mix(in srgb, var(--syk-accent) 25%, transparent);
  border-top-color: var(--syk-accent);
  border-radius: 50%;
  animation: syk-reader-spin 0.8s linear infinite;
}

@keyframes syk-reader-spin {
  to {
    transform: rotate(360deg);
  }
}

@media (prefers-reduced-motion: reduce) {
  .syk-reader__viewer::after,
  .syk-reader__stage::before,
  .syk-reader__stage::after {
    transition: none;
  }
}

.syk-reader__error strong {
  font-size: 20px;
}

.syk-reader__error p {
  margin: 0;
}

.syk-reader__error a {
  padding: 10px 18px;
  color: #fff;
  background: var(--syk-accent);
  border-radius: 6px;
  text-decoration: none;
}

.syk-reader__footer button {
  gap: 8px;
  min-width: 92px;
  font-size: 16px;
}

#syk-prev::before {
  content: "‹";
}

#syk-next::after {
  content: "›";
}

#syk-prev {
  order: 1;
}

#syk-location {
  min-width: 72px;
  order: 2;
  text-align: center;
}

#syk-next {
  order: 4;
}

.syk-reader__app.is-rtl #syk-next {
  order: 1;
}

.syk-reader__app.is-rtl #syk-location {
  order: 2;
}

.syk-reader__app.is-rtl #syk-prev {
  order: 4;
}

.syk-reader__app.is-rtl #syk-next::after {
  content: "‹";
  order: -1;
}

.syk-reader__app.is-rtl #syk-prev::before {
  content: "›";
  order: 1;
}

.syk-reader__footer button:disabled {
  cursor: wait;
  opacity: 0.45;
}

.syk-reader__footer output {
  max-width: 42%;
  overflow: hidden;
  color: color-mix(in srgb, var(--syk-chrome-text) 74%, transparent);
  font-size: 12px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.syk-reader__drawer {
  position: fixed;
  top: 0;
  bottom: 0;
  z-index: 60;
  width: min(88vw, 360px);
  padding-top: var(--syk-safe-top);
  overflow: auto;
  color: var(--syk-chrome-text);
  background: var(--syk-chrome-bg);
  box-shadow: 0 0 28px rgba(0, 0, 0, 0.2);
  visibility: hidden;
  transition:
    transform 0.22s ease,
    visibility 0.22s;
}

.syk-reader__drawer--left {
  left: 0;
  transform: translateX(-105%);
}

.syk-reader__drawer--right {
  right: 0;
  transform: translateX(105%);
}

.syk-reader__drawer.is-open {
  visibility: visible;
  transform: translateX(0);
}

.syk-reader__drawer-head {
  position: sticky;
  top: 0;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 56px;
  padding: 6px 12px 6px 20px;
  background: var(--syk-chrome-bg);
  border-bottom: 1px solid var(--syk-chrome-border);
}

.syk-reader__backdrop {
  position: fixed;
  inset: 0;
  z-index: 50;
  width: 100%;
  height: 100%;
  padding: 0;
  background: rgba(0, 0, 0, 0.38);
  border: 0;
}

.syk-reader__toc {
  padding: 12px 10px 32px;
}

.syk-reader__toc-level {
  margin: 0;
  padding: 0;
  list-style: none;
}

.syk-reader__toc-level .syk-reader__toc-level {
  padding-left: 16px;
}

.syk-reader__toc li {
  margin: 0;
}

.syk-reader__toc button {
  width: 100%;
  padding: 11px 10px;
  color: var(--syk-chrome-text);
  background: transparent;
  border: 0;
  border-bottom: 1px solid
    color-mix(in srgb, var(--syk-chrome-border) 70%, transparent);
  text-align: left;
  cursor: pointer;
}

.syk-reader__toc button:hover,
.syk-reader__toc button:focus-visible {
  color: var(--syk-accent);
  outline: none;
}

.syk-reader__visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.syk-reader__search-form {
  padding: 16px 14px 8px;
}

.syk-reader__search-controls {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 8px;
}

.syk-reader__search-controls input,
.syk-reader__search-controls button {
  min-height: 44px;
  color: var(--syk-chrome-text);
  background: var(--syk-page-bg);
  border: 1px solid var(--syk-chrome-border);
  border-radius: 8px;
}

.syk-reader__search-controls input {
  min-width: 0;
  padding: 8px 11px;
  -webkit-user-select: text;
  user-select: text;
}

.syk-reader__search-controls button {
  padding: 8px 14px;
  color: var(--syk-page-bg);
  background: var(--syk-accent);
  cursor: pointer;
}

.syk-reader__search-controls input:disabled,
.syk-reader__search-controls button:disabled {
  cursor: wait;
  opacity: 0.52;
}

.syk-reader__search-status {
  min-height: 24px;
  margin: 0;
  padding: 4px 18px 10px;
  color: color-mix(in srgb, var(--syk-chrome-text) 72%, transparent);
  font-size: 12px;
}

.syk-reader__search-results {
  margin: 0;
  padding: 0 10px 32px;
  list-style: none;
}

.syk-reader__search-results li {
  margin: 0;
}

.syk-reader__search-result {
  display: block;
  width: 100%;
  padding: 12px 10px;
  color: var(--syk-chrome-text);
  background: transparent;
  border: 0;
  border-bottom: 1px solid
    color-mix(in srgb, var(--syk-chrome-border) 70%, transparent);
  text-align: left;
  cursor: pointer;
}

.syk-reader__search-result:hover,
.syk-reader__search-result:focus-visible {
  color: var(--syk-accent);
  background: color-mix(in srgb, var(--syk-accent) 7%, transparent);
  outline: none;
}

.syk-reader__search-result-title {
  display: block;
  margin-bottom: 5px;
  font-size: 12px;
  font-weight: 700;
}

.syk-reader__search-result-excerpt {
  display: -webkit-box;
  overflow: hidden;
  color: color-mix(in srgb, var(--syk-chrome-text) 82%, transparent);
  font-family: "Yu Mincho", YuMincho, "Hiragino Mincho ProN", serif;
  font-size: 13px;
  line-height: 1.65;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
}

.syk-reader__search-result-excerpt mark {
  padding: 0;
  color: inherit;
  background: color-mix(in srgb, #f1c84b 55%, transparent);
}

.syk-reader__settings {
  display: grid;
  gap: 12px;
  padding: 20px;
}

.syk-reader__settings label,
.syk-reader__setting-label {
  margin-top: 5px;
  font-size: 13px;
  font-weight: 700;
}

.syk-reader__settings select,
.syk-reader__wide-button {
  width: 100%;
  min-height: 44px;
  padding: 8px 10px;
  color: var(--syk-chrome-text);
  background: transparent;
  border: 1px solid var(--syk-chrome-border);
  border-radius: 7px;
}

.syk-reader__settings select option {
  color: #222;
  background: #fff;
}

.syk-reader__stepper {
  display: grid;
  grid-template-columns: 48px 1fr 48px;
  align-items: center;
  border: 1px solid var(--syk-chrome-border);
  border-radius: 7px;
}

.syk-reader__stepper button {
  min-height: 44px;
  color: var(--syk-chrome-text);
  background: transparent;
  border: 0;
  font-size: 22px;
  cursor: pointer;
}

.syk-reader__stepper output {
  text-align: center;
}

.syk-reader__theme-buttons {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.syk-reader__theme-buttons button {
  min-height: 44px;
  color: var(--syk-chrome-text);
  background: transparent;
  border: 1px solid var(--syk-chrome-border);
  border-radius: 7px;
  cursor: pointer;
}

.syk-reader__theme-buttons button.is-selected {
  color: #fff;
  background: var(--syk-accent);
  border-color: var(--syk-accent);
}

.syk-reader__wide-button {
  margin-top: 10px;
  cursor: pointer;
}

@media (min-width: 900px) and (max-height: 849px) {
  :root {
    --syk-toolbar-height: 46px;
    --syk-footer-height: 52px;
  }

  .syk-reader__stage {
    padding: 8px 20px;
  }

  .syk-reader__viewer {
    width: min(72dvh, calc(100vw - 80px), 760px);
    height: 100%;
    max-width: none;
    max-height: 100%;
    aspect-ratio: auto;
  }
}

/* 縦幅の短いPC／横向きタブレット専用。スマホ表示には切り替えない。 */
@media (min-width: 769px) and (max-height: 700px) {
  :root {
    --syk-toolbar-height: 42px;
    --syk-footer-height: 46px;
  }

  .syk-reader__header {
    padding-right: max(6px, env(safe-area-inset-right));
    padding-left: max(6px, env(safe-area-inset-left));
  }

  .syk-reader__footer {
    gap: clamp(6px, 1.2vw, 14px);
    padding-right: max(10px, env(safe-area-inset-right));
    padding-left: max(10px, env(safe-area-inset-left));
  }

  .syk-icon-button,
  .syk-reader__footer button {
    min-height: 36px;
  }

  .syk-reader__stage {
    padding: 4px 12px;
  }

  .syk-reader__viewer {
    width: min(calc((100dvh - 96px) * 0.9), calc(100vw - 48px), 760px);
    height: 100%;
    max-width: none;
    max-height: 100%;
    aspect-ratio: auto;
  }
}

@media (max-width: 768px) {
  .syk-reader__footer {
    flex-direction: column;
    gap: 0;
    padding: 0 max(12px, env(safe-area-inset-right)) var(--syk-safe-bottom)
      max(12px, env(safe-area-inset-left));
  }

  .syk-reader__footer-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    min-height: 48px;
  }

  .syk-reader__page-jump {
    width: 92%;
    max-width: none;
    height: 28px;
    flex: 0 0 auto;
    order: initial;
  }

  #syk-location {
    min-width: 0;
  }

  #syk-prev {
    order: initial;
  }

  #syk-next {
    order: initial;
  }

  .syk-reader__app.is-rtl #syk-next {
    order: 1;
  }

  .syk-reader__app.is-rtl #syk-location {
    order: 2;
  }

  .syk-reader__app.is-rtl #syk-prev {
    order: 3;
  }

  .syk-reader__stage {
    padding: 0;
  }

  .syk-reader__viewer {
    width: 100%;
    height: 100%;
    max-height: none;
    aspect-ratio: auto;
    padding: calc(2px + 0.3em) 2px;
    border: 0;
    box-shadow: none;
  }
}

@media (max-width: 560px) {
  :root {
    --syk-toolbar-height: 54px;
    --syk-footer-height: 78px;
  }

  .syk-reader__header {
    padding-right: max(4px, env(safe-area-inset-right));
    padding-left: max(4px, env(safe-area-inset-left));
  }

  .syk-icon-button {
    min-width: 40px;
    padding: 0 7px;
  }

  .syk-reader__footer button {
    min-width: 72px;
  }

  .syk-reader__footer button span {
    display: none;
  }

  /* 狭い画面では書名の場所を優先し、印は引っ込める。 */
  .syk-reader__logo {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .syk-reader__drawer,
  .syk-reader__spinner {
    transition: none;
    animation-duration: 1.8s;
  }
}

/* ---------------- 使い方 ---------------- */
/*
 * **ここから「はじめての方へ」の終わりまでは、PDFビュアと同じ中身にしてある。**
 * 片方だけ直さないこと（devtools-notice.js と同じ扱い）。
 * PDFビュアの引き出しは flex、EPUBビュアの引き出しは overflow:auto の塊なので、
 * 下の drawer-foot は両方で効くように sticky と flex を両方書いてある。
 */

/* 引き出しの一番下に置く「使い方」。中身が長くても押し出されない。 */
.syk-reader__drawer-foot {
  position: sticky;
  bottom: 0;
  flex: 0 0 auto;
  padding: 10px 12px calc(12px + var(--syk-safe-bottom));
  background: var(--syk-chrome-bg);
  border-top: 1px solid var(--syk-chrome-border);
}

.syk-reader__drawer-foot .syk-reader__wide-button {
  margin-top: 0;
}

/*
 * 引き出し（z-index 60）より上に出す。
 * 「Aa」の中から開くので、引き出しに隠れてはいけない。
 */
.syk-reader__help {
  position: fixed;
  z-index: 80;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: max(16px, var(--syk-safe-top)) 16px max(16px, var(--syk-safe-bottom));
  background: rgba(20, 18, 15, 0.55);
  inset: 0;
}

.syk-reader__help[hidden] {
  display: none;
}

.syk-help__sheet {
  display: flex;
  width: min(100%, 560px);
  max-height: 100%;
  flex-direction: column;
  border-radius: 12px;
  background: var(--syk-chrome-bg);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.32);
  color: var(--syk-chrome-text);
}

.syk-help__head {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 10px 8px 10px 20px;
  border-bottom: 1px solid var(--syk-chrome-border);
}

.syk-help__head strong {
  display: block;
  font-size: 17px;
}

.syk-help__subtitle {
  display: block;
  color: color-mix(in srgb, var(--syk-chrome-text) 62%, transparent);
  font-size: 11px;
  line-height: 1.4;
}

.syk-help__tabs {
  display: grid;
  flex: 0 0 auto;
  grid-template-columns: repeat(2, 1fr);
  border-bottom: 1px solid var(--syk-chrome-border);
}

/* 目次の切り替えタブと同じ見た目。EPUBビュアにはそちらが無いので、
   使い方のぶんはここで完結させてある。 */
.syk-help__tab {
  min-height: 44px;
  padding: 8px;
  color: color-mix(in srgb, var(--syk-chrome-text) 70%, transparent);
  background: transparent;
  border: 0;
  border-bottom: 2px solid transparent;
  font-size: 13px;
  cursor: pointer;
}

.syk-help__tab[aria-selected="true"] {
  color: var(--syk-accent);
  border-bottom-color: var(--syk-accent);
  font-weight: 700;
}

.syk-help__body {
  flex: 1 1 auto;
  padding: 6px 20px 14px;
  overflow: auto;
  overscroll-behavior: contain;
}

.syk-help__group {
  margin: 12px 0 6px;
  color: color-mix(in srgb, var(--syk-chrome-text) 62%, transparent);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.syk-help__row {
  display: grid;
  align-items: start;
  gap: 12px;
  grid-template-columns: 46px minmax(0, 1fr);
  padding: 9px 0;
  border-top: 1px solid color-mix(in srgb, var(--syk-chrome-border) 55%, transparent);
}

.syk-help__group + .syk-help__row {
  border-top: 0;
}

/*
 * アイコンの枠。中身はヘッダーの本物のボタンから写したものが入るので、
 * ここでは「本物と同じ見え方」になる下地だけを用意する。
 */
.syk-help__icon {
  display: flex;
  width: 46px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--syk-chrome-border);
  border-radius: 8px;
  background: color-mix(in srgb, var(--syk-chrome-text) 4%, transparent);
  color: var(--syk-chrome-text);
  font-size: 19px;
  line-height: 1;
}

/* ヘッダーから写した検索アイコンにも、本物と同じ線の引き方を効かせる。 */
.syk-help__icon svg {
  width: 21px;
  height: 21px;
  overflow: visible;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
}

/* 欄外クリックの矢印だけは、絵そのものに色が付いているので線を足さない。 */
.syk-help__icon--art svg {
  width: 34px;
  height: 34px;
  fill: revert;
  stroke: revert;
  stroke-width: revert;
}

.syk-help__icon--close {
  font-size: 26px;
  font-weight: 300;
}

.syk-help__icon--text {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.syk-help__name {
  font-size: 14px;
  font-weight: 700;
  line-height: 1.5;
}

.syk-help__text {
  margin: 2px 0 0;
  color: color-mix(in srgb, var(--syk-chrome-text) 78%, transparent);
  font-size: 12.5px;
  line-height: 1.65;
}

.syk-help__foot {
  flex: 0 0 auto;
  padding: 12px 20px 16px;
  border-top: 1px solid var(--syk-chrome-border);
}

.syk-help__primary {
  width: 100%;
  min-height: 46px;
  padding: 8px 10px;
  border: 1px solid var(--syk-accent);
  border-radius: 7px;
  background: var(--syk-accent);
  color: #fff;
  font-size: 15px;
  cursor: pointer;
}

.syk-reader__app[data-theme="dark"] .syk-help__primary {
  color: #17191c;
}

/* ---- はじめての方へ ---- */

.syk-help__sheet--intro {
  gap: 6px;
  padding: 26px 22px 22px;
  text-align: center;
}

.syk-help__eyebrow {
  color: var(--syk-accent);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.syk-help__sheet--intro strong {
  font-family: "Yu Mincho", YuMincho, "Hiragino Mincho ProN", serif;
  font-size: 19px;
  line-height: 1.5;
}

.syk-help__sheet--intro p {
  margin: 4px 0 14px;
  color: color-mix(in srgb, var(--syk-chrome-text) 76%, transparent);
  font-size: 12.5px;
  line-height: 1.75;
  text-align: left;
}

.syk-help__intro-buttons {
  display: grid;
  gap: 8px;
}

.syk-help__intro-buttons .syk-reader__wide-button {
  margin-top: 0;
  cursor: pointer;
}