*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

[hidden] {
  display: none !important;
}

:root {
  --bg: #ffffff;
  --panel: #ffffff;
  --text: #1a1a1a;
  --muted: #6b7280;
  --accent: #000000;
  --border: #e5e7eb;
  --button-bg: #ffffff;
  --button-bg-hover: #f3f4f6;
  --button-border: #d1d5db;
  --slide-bg: #ffffff;
  --slide-border: #e5e7eb;
  --menu-hover-bg: rgba(0, 0, 0, 0.06);
  --backdrop: rgba(0, 0, 0, 0.28);
  --lens-border: rgba(0, 0, 0, 0.85);
  --nav-zone-hover: rgba(0, 0, 0, 0.12);
  --font: "Inter", "Roboto", "Helvetica Neue", "Arial", "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
  /* 脚注パネルの予約高さ。資料内で最も高い脚注に合わせて JS が設定する */
  --refs-band: 0px;
  /* サムネイルバーの実測高さ。表示中のみ JS が設定する */
  --filmstrip-band: 0px;
  --slide-max-h: calc(100vh - 3.5rem - var(--refs-band) - var(--filmstrip-band));
  /* テキストスライドの設計サイズ（16:9）。実表示は JS が --slide-scale で拡縮する */
  --slide-w: 960px;
  --slide-h: 540px;
  color-scheme: light;
}

html[data-theme="dark"] {
  --bg: #111111;
  --panel: #222222;
  --text: #ffffff;
  --muted: rgba(255, 255, 255, 0.72);
  --accent: #ffffff;
  --border: rgba(255, 255, 255, 0.22);
  --button-bg: rgba(255, 255, 255, 0.08);
  --button-bg-hover: rgba(255, 255, 255, 0.16);
  --button-border: rgba(255, 255, 255, 0.35);
  --slide-bg: #111111;
  --slide-border: rgba(255, 255, 255, 0.22);
  --menu-hover-bg: rgba(255, 255, 255, 0.1);
  --backdrop: rgba(0, 0, 0, 0.55);
  --lens-border: rgba(255, 255, 255, 0.85);
  --nav-zone-hover: rgba(255, 255, 255, 0.16);
  color-scheme: dark;
}

body {
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-weight: 400;
  display: flex;
  flex-direction: column;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 1.25rem;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-width: 0;
  flex: 1;
}

header h1 {
  font-size: 1rem;
  font-weight: 700;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
}

.menu-btn {
  font-size: 1.25rem;
  line-height: 1;
  padding: 0.35rem 0.65rem;
}

.menu-backdrop {
  position: fixed;
  inset: 0;
  background: var(--backdrop);
  z-index: 200;
  opacity: 0;
  transition: opacity 0.2s ease;
}

.menu-backdrop.visible {
  opacity: 1;
}

.side-menu {
  position: fixed;
  top: 0;
  left: 0;
  height: 100%;
  width: min(16rem, 80vw);
  background: var(--panel);
  border-right: 1px solid var(--border);
  z-index: 201;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  transform: translateX(-100%);
  transition: transform 0.2s ease;
}

.side-menu.open {
  transform: translateX(0);
}

.menu-section {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.menu-section + .menu-section {
  margin-top: 0.75rem;
}

.menu-heading {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  padding: 0 0.25rem;
}

.side-menu .menu-link {
  display: block;
  width: 100%;
  padding: 0.5rem 0.25rem;
  color: var(--text);
  text-decoration: none;
  font-size: 0.95rem;
  border-radius: 4px;
  transition: color 0.15s, background 0.15s;
}

.side-menu .menu-link:hover {
  color: var(--accent);
  background: var(--menu-hover-bg);
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.5rem 0.25rem;
  font-size: 0.95rem;
  color: var(--text);
  cursor: pointer;
  user-select: none;
}

.theme-toggle input {
  appearance: none;
  width: 2.5rem;
  height: 1.4rem;
  margin: 0;
  flex-shrink: 0;
  border: 1px solid var(--button-border);
  border-radius: 999px;
  background: var(--button-bg);
  position: relative;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

.theme-toggle input::after {
  content: "";
  position: absolute;
  top: 0.12rem;
  left: 0.12rem;
  width: 1.05rem;
  height: 1.05rem;
  border-radius: 50%;
  background: var(--text);
  transition: transform 0.15s;
}

.theme-toggle input:checked {
  background: var(--accent);
  border-color: var(--accent);
}
.btn-primary:active {
  background: var(--text);
  border-color: var(--text);
}
.btn-danger {
  background: #dc3545;
  border-color: #dc3545;
  color: #fff;
}
.btn-danger:hover {
  background: #c82333;
  border-color: #bd2130;
}

.theme-toggle input:checked::after {
  transform: translateX(1.08rem);
}

.menu-footer {
  margin-top: auto;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.side-menu .deck-label {
  font-size: 0.8rem;
  color: var(--muted);
  padding: 0 0.25rem;
}

.deck-dialog .deck-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.deck-dialog .deck-option {
  width: 100%;
  text-align: left;
}

.deck-dialog .deck-option.is-current {
  border-color: var(--accent);
  color: var(--accent);
}

.deck-dialog .deck-id {
  color: var(--muted);
  font-size: 0.85em;
}

.deck-dialog .deck-empty {
  color: var(--muted);
  font-size: 0.9rem;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.fullscreen-btn {
  font-size: 1.15rem;
  line-height: 1;
  padding: 0.35rem 0.6rem;
  min-width: 2.25rem;
}

button {
  appearance: none;
  border: 1px solid var(--button-border);
  background: var(--button-bg);
  color: var(--text);
  padding: 0.45rem 1rem;
  border-radius: 6px;
  font-size: 0.9rem;
  font-family: inherit;
  cursor: pointer;
  touch-action: manipulation;
  transition: background 0.15s, border-color 0.15s;
}

button:hover:not(:disabled) {
  background: var(--button-bg-hover);
  border-color: var(--accent);
}

button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.status {
  font-size: 0.85rem;
  color: var(--muted);
  min-width: 8rem;
  text-align: center;
}

.help-dialog {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem 1.5rem;
  background: var(--panel);
  color: var(--text);
  max-width: 28rem;
  line-height: 1.7;
}

.help-dialog::backdrop {
  background: var(--backdrop);
}

.help-dialog h2 {
  font-size: 1rem;
  margin-bottom: 0.75rem;
}

.help-dialog ul {
  list-style: none;
  font-size: 0.9rem;
  color: var(--muted);
}

.help-dialog li + li {
  margin-top: 0.35rem;
}

.help-dialog .dialog-actions {
  margin-top: 1rem;
  text-align: right;
}

.stage {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
  background: var(--bg);
  position: relative;
  font-family: var(--font);
  color: var(--text);
}

.fs-title {
  display: none;
}

:is(.stage:fullscreen, .stage.is-fullscreen) {
  --slide-max-h: 100%;
}

:is(.stage:fullscreen, .stage.is-fullscreen).cover-slide .fs-title {
  display: none;
}

:is(.stage:fullscreen, .stage.is-fullscreen) .fs-title:not(:empty) {
  display: block;
  position: absolute;
  top: 0.7rem;
  right: 1rem;
  z-index: 60;
  margin: 0;
  max-width: min(42vw, 28rem);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 0.9rem;
  font-weight: 400;
  letter-spacing: 0.02em;
  color: var(--muted);
  pointer-events: none;
  user-select: none;
}

main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  overflow: hidden;
  position: relative;
  min-height: 0;
}

.viewer {
  position: relative;
  max-width: 100%;
  max-height: var(--slide-max-h);
  user-select: none;
}

.viewer.image-slide {
  cursor: crosshair;
}

/* 設計サイズで組んだ内容を scale で拡縮するため、折り返し位置は表示サイズに依存しない */
.viewer.text-slide {
  cursor: default;
  user-select: text;
  width: var(--slide-w);
  height: var(--slide-h);
  max-width: none;
  max-height: none;
  flex: 0 0 auto;
  background: var(--slide-bg);
  border: 1px solid var(--slide-border);
  border-radius: 8px;
  overflow: hidden;
  transform: scale(var(--slide-scale, 1));
  transform-origin: center center;
  --logo-h: 1.26rem;
  --logo-w: 4.76rem;
  --logo-clear: calc(var(--logo-h) * 2 / 3);
  --logo-pad: calc(var(--logo-h) * 0.12);
  /* スライド下端からロゴまでの距離。小さいほどロゴが下に寄る */
  --logo-bottom: calc(var(--logo-h) * 3 / 4);
  /* 本文がロゴに重ならないよう、下側に確保する高さ */
  --logo-reserve: calc(
    var(--logo-h) + var(--logo-pad) * 2 + var(--logo-bottom) + var(--logo-clear)
  );
}

.slide-text-center,
.slide-cover {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  height: 100%;
  padding: 2rem 2rem max(2rem, var(--logo-reserve));
}

.slide-text-center h2,
.slide-cover h2 {
  font-size: 2.25rem;
  font-weight: 700;
  line-height: 1.4;
}

.slide-text-center p,
.slide-cover-subtitle {
  margin-top: 1rem;
  font-size: 1.35rem;
  color: var(--muted);
  line-height: 1.6;
}

.slide-cover-speaker {
  margin-top: 1.75rem;
  font-size: 1.2rem;
  color: var(--muted);
  line-height: 1.6;
}

.slide-text-topleft {
  height: 100%;
  overflow-y: auto;
  padding: 2.5rem 3rem var(--logo-reserve);
}

.slide-text-topleft h2 {
  font-size: 1.85rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 1.5rem;
}

.slide-body {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.slide-text-topleft .slide-body > p {
  font-size: 1.1rem;
  line-height: 1.85;
  white-space: pre-wrap;
}

.slide-col-grid {
  display: grid;
  gap: 0.75rem;
  width: 100%;
  align-items: stretch;
}

.slide-col-grid[data-cols="2"],
.slide-col-grid[data-cols="4"] {
  grid-template-columns: 1fr 1fr;
}

.slide-col-grid[data-cols="3"] {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.slide-col-box {
  min-width: 0;
  min-height: 4.5rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: color-mix(in srgb, var(--panel) 88%, var(--text) 6%);
}

.slide-col-box h3 {
  font-size: 1.045rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 0.4rem;
}

.slide-col-box p {
  font-size: 0.99rem;
  line-height: 1.65;
  white-space: pre-wrap;
}

.viewer.text-slide h2,
.viewer.text-slide h3,
.viewer.text-slide p {
  cursor: text;
}

/* 全画面はクリックでページ送りするため、テキストカーソルを出さない */
:is(.stage:fullscreen, .stage.is-fullscreen) .viewer.text-slide h2,
:is(.stage:fullscreen, .stage.is-fullscreen) .viewer.text-slide h3,
:is(.stage:fullscreen, .stage.is-fullscreen) .viewer.text-slide p {
  cursor: default;
}

.viewer.image-slide img {
  display: block;
  max-width: 100%;
  max-height: var(--slide-max-h);
  width: auto;
  height: auto;
  object-fit: contain;
}

.slide-logo-box {
  position: absolute;
  left: var(--logo-clear);
  bottom: var(--logo-bottom);
  z-index: 2;
  padding: var(--logo-pad);
  background: #fff;
  pointer-events: none;
  user-select: none;
}

.slide-logo {
  display: block;
  max-height: var(--logo-h);
  max-width: var(--logo-w);
  width: auto;
  height: auto;
  object-fit: contain;
}

:is(.stage:fullscreen, .stage.is-fullscreen) main {
  padding: 0;
}

/* 画面端に貼り付かないよう、上下 3%・左右 2% の余白を残す */
:is(.stage:fullscreen, .stage.is-fullscreen) .viewer.image-slide {
  width: 100%;
  height: 100%;
  padding: 3vh 2vw;
}

:is(.stage:fullscreen, .stage.is-fullscreen) .viewer.image-slide img {
  width: 100%;
  height: 100%;
}

/* 全画面でも設計サイズは変えず、枠線だけ消して画面と一体に見せる */
:is(.stage:fullscreen, .stage.is-fullscreen) .viewer.text-slide {
  border-color: transparent;
  border-radius: 0;
  /* ロゴをスライド下端より下へ出すため */
  overflow: visible;
}

/* 全画面ではスライド下端より外へ出し、通常表示より画像 1 個分低い位置に置く */
:is(.stage:fullscreen, .stage.is-fullscreen) .slide-logo-box {
  bottom: calc(var(--logo-h) * -3 / 4);
}

/* 全画面時のみ、左右 5% をページ送りのクリック範囲として表示する */
.nav-zone {
  display: none;
  touch-action: manipulation;
}

:is(.stage:fullscreen, .stage.is-fullscreen) .nav-zone {
  display: block;
  position: absolute;
  top: 0;
  bottom: 0;
  width: 5%;
  z-index: 70;
  cursor: pointer;
  background: transparent;
  transition: background 0.15s ease;
}

:is(.stage:fullscreen, .stage.is-fullscreen) .nav-zone-prev {
  left: 0;
}

:is(.stage:fullscreen, .stage.is-fullscreen) .nav-zone-next {
  right: 0;
}

:is(.stage:fullscreen, .stage.is-fullscreen) .nav-zone:hover {
  background: var(--nav-zone-hover);
}

:is(.stage:fullscreen, .stage.is-fullscreen) .nav-zone.is-disabled {
  cursor: default;
}

:is(.stage:fullscreen, .stage.is-fullscreen) .nav-zone.is-disabled:hover {
  background: transparent;
}

.filmstrip {
  position: relative;
  flex-shrink: 0;
  background: var(--panel);
  border-top: 1px solid var(--border);
  /* レンズ（z-index: 100）より手前に出す */
  z-index: 110;
}

.filmstrip[hidden] {
  display: none;
}

.filmstrip-track {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: thin;
  overscroll-behavior-x: contain;
}

.filmstrip-item {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.2rem;
  padding: 0.25rem;
  border: 1px solid transparent;
  border-radius: 6px;
  background: transparent;
}

.filmstrip-item:hover:not(:disabled) {
  background: var(--menu-hover-bg);
  border-color: var(--button-border);
}

.filmstrip-item.is-active {
  background: var(--menu-hover-bg);
  border-color: var(--accent);
}

.filmstrip-thumb {
  position: relative;
  display: block;
  width: 128px;
  height: 72px;
  overflow: hidden;
  background: var(--slide-bg);
  border: 1px solid var(--slide-border);
  border-radius: 4px;
}

.filmstrip-thumb img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

/* 設計サイズのまま組んだテキストスライドを、左上基準で縮小して収める */
.filmstrip-thumb .viewer.text-slide {
  position: absolute;
  top: 0;
  left: 0;
  transform-origin: top left;
  background: transparent;
  border: 0;
  border-radius: 0;
  pointer-events: none;
}

.filmstrip-thumb .slide-text-topleft {
  overflow: hidden;
}

.filmstrip-caption {
  font-size: 0.65rem;
  line-height: 1.2;
  color: var(--muted);
  width: 128px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  text-align: center;
}

.filmstrip-item.is-active .filmstrip-caption {
  color: var(--accent);
  font-weight: 700;
}

/* 全画面ではスライドを狭めず、下端に近づいたときだけ重ねて出す */
:is(.stage:fullscreen, .stage.is-fullscreen) .filmstrip {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  opacity: 0;
  transform: translateY(100%);
  pointer-events: none;
  transition: transform 0.18s ease, opacity 0.18s ease;
}

:is(.stage:fullscreen, .stage.is-fullscreen).filmstrip-peek .filmstrip {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

/* 全画面ではバーが重なり表示なので、フッターを持ち上げない */
:is(.stage:fullscreen, .stage.is-fullscreen) .footer-meta {
  bottom: 0.75rem;
}

.lens {
  position: fixed;
  border-radius: 20px;
  border: 3px solid var(--lens-border);
  box-shadow:
    0 0 0 1px rgba(0, 0, 0, 0.4),
    0 8px 24px rgba(0, 0, 0, 0.45);
  pointer-events: none;
  overflow: hidden;
  opacity: 0;
  transition: opacity 0.12s ease;
  z-index: 100;
  background-repeat: no-repeat;
  background-color: #000;
}

.lens.visible {
  opacity: 1;
}

.empty {
  color: var(--muted);
  text-align: center;
  line-height: 1.6;
}

.references {
  padding: 0.75rem 1.25rem;
  background: var(--panel);
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  line-height: 1.8;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.references.hidden {
  display: none;
}

/* 脚注のないスライドでも高さを保ち、スライドの表示位置をずらさない */
html.has-references .references {
  height: var(--refs-band);
  overflow-y: auto;
}

html.has-references .references.hidden {
  display: flex;
  visibility: hidden;
}

.references .ref-item {
  display: block;
}

.references a {
  color: var(--accent);
  text-decoration: none;
  word-break: break-all;
}

.references a:hover {
  text-decoration: underline;
}

.references .ref-num {
  color: var(--muted);
}

.references .ref-text {
  color: var(--text);
}

.footer-meta {
  position: fixed;
  right: 1rem;
  /* 画面下端から積み上がる脚注パネルとサムネイルバーの上に置く */
  bottom: calc(0.75rem + var(--refs-band) + var(--filmstrip-band));
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.15rem;
  z-index: 50;
  pointer-events: none;
  user-select: none;
}

.slide-number {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.02em;
  color: var(--text);
}

.powered-by {
  font-size: 0.7rem;
  color: var(--muted);
  margin: 0;
}

.powered-by span {
  color: var(--text);
  font-weight: 500;
}

/* GitHub Status Badge & Tab Styles */
.gh-status-badge {
  font-size: 0.75rem;
  color: var(--muted);
  padding: 0.15rem 0.4rem;
  background: var(--button-bg-hover);
  border: 1px solid var(--button-border);
  border-radius: 4px;
  width: fit-content;
}

.source-tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.5rem;
}

.tab-btn {
  flex: 1;
  padding: 0.4rem 0.75rem;
  font-size: 0.85rem;
  border: 1px solid var(--button-border);
  background: var(--button-bg);
  cursor: pointer;
}

.tab-btn.active {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--bg);
  font-weight: 600;
}

.gh-repo-form {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1rem;
  background: var(--button-bg-hover);
  padding: 0.75rem;
  border-radius: 6px;
}

.input-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.input-row label {
  font-size: 0.8rem;
  width: 5.5rem;
  color: var(--muted);
}

.input-row input {
  flex: 1;
  padding: 0.4rem 0.6rem;
  border: 1px solid var(--button-border);
  border-radius: 4px;
  background: var(--bg);
  color: var(--text);
  font-family: inherit;
  font-size: 1.1rem;
}

.gh-login-btn {
  display: inline-block;
  text-align: center;
  text-decoration: none;
}

/* Typography & General Components */
.gh-auth-dialog {
  max-width: 32rem;
}

.gh-user-container {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem;
  background: var(--button-bg-hover);
  border-radius: 8px;
  margin-bottom: 1rem;
}

.gh-avatar {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  border: 1px solid var(--border);
}

.gh-user-info {
  display: flex;
  flex-direction: column;
  flex: 1;
}

.gh-username {
  font-weight: 700;
  font-size: 0.95rem;
}

.gh-user-status {
  font-size: 0.75rem;
  color: var(--muted);
}

.btn-danger {
  background: #d32f2f;
  color: #fff;
  border-color: #b71c1c;
}

.btn-danger:hover {
  background: #b71c1c;
}

.btn-primary {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
  font-weight: 600;
}

.btn-primary:hover {
  opacity: 0.9;
}

.btn-large {
  width: 100%;
  padding: 0.75rem;
  font-size: 1rem;
}

.gh-device-section .desc {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 1rem;
}

.gh-code-container {
  margin-top: 1rem;
  padding: 1rem;
  border: 1px dashed var(--border);
  border-radius: 8px;
  background: var(--button-bg-hover);
  text-align: center;
}

.code-box {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  margin: 0.75rem 0;
}

.user-code {
  font-family: monospace;
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  background: var(--bg);
  padding: 0.4rem 1rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  color: var(--accent);
}

.btn-link {
  display: inline-block;
  margin-top: 0.5rem;
  color: var(--accent);
  text-decoration: underline;
  font-weight: 600;
}

.poll-status {
  margin-top: 0.75rem;
  font-size: 0.8rem;
  color: var(--muted);
  font-style: italic;
}

.gh-advanced-details {
  margin-top: 1.25rem;
  font-size: 0.85rem;
}

.gh-advanced-details summary {
  cursor: pointer;
  color: var(--muted);
  user-select: none;
}

.advanced-form {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: 0.75rem;
  padding-left: 0.5rem;
}

/* トースト通知 */
.update-toast {
  position: fixed;
  top: 70px;
  right: 20px;
  background: var(--panel);
  color: var(--text);
  padding: 1rem 1.5rem;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  display: flex;
  align-items: center;
  gap: 1rem;
  z-index: 10000;
  opacity: 0;
  transform: translateY(-20px);
  pointer-events: none;
  transition: all 0.3s ease;
  border: 1px solid var(--border);
}

.update-toast.show {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.update-toast button {
  background: var(--accent);
  color: var(--bg);
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.9rem;
  transition: opacity 0.2s;
}
.update-toast button:hover {
  opacity: 0.9;
}

.update-toast .close-btn {
  background: transparent;
  color: var(--text);
  padding: 0.25rem 0.5rem;
  font-size: 1.2rem;
  opacity: 0.7;
}
.update-toast .close-btn:hover {
  background: transparent;
  opacity: 1;
}

/* Mobile optimizations */
@media (max-width: 768px), (max-width: 950px) and (max-height: 500px) {
  .controls {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 0.75rem;
    background: var(--panel);
    border-top: 1px solid var(--border);
    justify-content: center;
    gap: 0.35rem;
    z-index: 10000;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.05);
  }
  
  .controls .status {
    min-width: auto;
    margin: 0 0.5rem;
  }
  
  .stage {
    padding-bottom: 3.5rem;
  }
  
  .footer-meta {
    position: static;
    align-items: center;
    padding: 0.5rem 0;
    margin-top: auto;
  }
  
  .powered-by {
    display: block;
  }
  
  .filmstrip {
    position: fixed;
    bottom: 3.8rem;
    left: 0;
    right: 0;
    z-index: 110;
  }
  
  :is(.stage:fullscreen, .stage.is-fullscreen) .filmstrip {
    bottom: 3.8rem;
  }
  
  /* Ensure header elements fit in narrow screens */
  header {
    gap: 0.5rem;
  }
  
  .header-right {
    gap: 0.25rem;
  }
}

.stage.is-fullscreen { position: fixed; inset: 0; z-index: 9999; background: var(--bg); display: flex; flex-direction: column; width: 100vw; height: 100vh; overflow: hidden; }


/* Hide Powered By in landscape to save vertical space */
@media (max-width: 950px) and (max-height: 500px) {
  .powered-by {
    display: none;
  }
  .footer-meta {
    position: absolute;
    bottom: 3.75rem;
    right: 0.75rem;
    align-items: flex-end;
    padding: 0;
    margin: 0;
  }
}


/* Hide maximize button on mobile portrait */
@media (max-width: 768px) and (orientation: portrait) {
  #fullscreenBtn {
    display: none;
  }
}