@import url("/assets/fonts/noto-sans/noto-sans.css");

/* Public shared base (Stage 3) */
:root {
  --focus-ring: rgba(15, 127, 149, 0.45);
  --focus-ring-strong: rgba(12, 103, 122, 0.62);
  --font-size-caption: 12px;
  --font-size-body-sm: 13px;
  --font-size-body: 14px;
  --font-size-body-lg: 16px;
  --font-size-h1: clamp(24px, 3.6vw, 28px);
  --font-size-h2: clamp(20px, 3vw, 24px);
  --font-size-h3: clamp(17px, 2.4vw, 20px);
  --line-height-body: 1.45;
  --line-height-heading: 1.2;
}

html {
  font-size: 100%;
}

body {
  margin: 0;
  font-family: "Noto Sans", Arial, sans-serif;
  font-size: var(--font-size-body);
  line-height: var(--line-height-body);
}

h1,
h2,
h3 {
  line-height: var(--line-height-heading);
}

h1 {
  font-size: var(--font-size-h1);
}

h2 {
  font-size: var(--font-size-h2);
}

h3 {
  font-size: var(--font-size-h3);
}

a {
  text-decoration: none;
}

.skip-link {
  position: fixed;
  left: 12px;
  top: 10px;
  z-index: 4000;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid #0c6c7f;
  background: linear-gradient(180deg, #178ea6 0%, #0f7f95 100%);
  color: #ffffff;
  font-weight: 700;
  font-size: var(--font-size-body-sm);
  letter-spacing: 0.2px;
  transform: translateY(-140%);
  transition: transform 0.14s ease;
}
.skip-link:focus-visible {
  transform: translateY(0);
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--focus-ring-strong);
  outline-offset: 2px;
  border-radius: 8px;
}

.page-footer {
  margin-top: 24px;
  padding: 12px 0;
  border-top: 1px solid #d9e0e6;
  text-align: center;
  color: #6b7785;
  font-size: var(--font-size-caption);
  background: transparent;
  border-radius: 0;
}

.alert {
  margin: 10px 0;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid transparent;
  font-size: var(--font-size-body);
  line-height: 1.45;
}

.alert-error {
  background: #fff1ef;
  border-color: #f5c7c0;
  color: #9f2c1f;
}

.alert-success {
  background: #e9f9f2;
  border-color: #bde6d1;
  color: #186649;
}

button:disabled,
.is-disabled {
  cursor: not-allowed !important;
  opacity: 0.72;
}

.is-loading {
  cursor: wait !important;
}

.page-fade-ready body {
  opacity: 0;
  transform: translateY(4px);
}

.page-fade-ready.page-fade-in body {
  opacity: 1;
  transform: none;
  transition: opacity 0.16s ease, transform 0.16s ease;
}

.page-loading-layer {
  position: fixed;
  inset: 0;
  z-index: 5000;
  display: grid;
  place-items: center;
  padding: 18px;
  background: rgba(247, 248, 250, 0.58);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.14s ease;
}

.page-loading-layer.is-visible {
  opacity: 1;
  pointer-events: auto;
}

.page-loading-card,
.loading-overlay-card {
  display: grid;
  justify-items: center;
  gap: 10px;
  width: min(100%, 320px);
  border: 1px solid rgba(229, 231, 235, 0.9);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.94);
  color: #111827;
  padding: 16px;
  box-shadow: 0 18px 46px rgba(17, 24, 39, 0.14);
}

.page-loading-skeleton:empty {
  display: none;
}

.page-loading-message,
.loading-overlay-message {
  color: #4b5563;
  font-size: 13px;
  font-weight: 800;
  line-height: 1.35;
  text-align: center;
}

.loading-spinner,
.loading-button-spinner {
  width: 16px;
  height: 16px;
  border-radius: 999px;
  border: 2px solid rgba(37, 99, 235, 0.2);
  border-top-color: #2563eb;
  animation: loading-spin 0.75s linear infinite;
}

.loading-button-spinner {
  flex: 0 0 auto;
  border-color: rgba(255, 255, 255, 0.45);
  border-top-color: #ffffff;
}

.btn-secondary .loading-button-spinner,
.secondary-button .loading-button-spinner {
  border-color: rgba(17, 24, 39, 0.18);
  border-top-color: #111827;
}

button.has-loading-spinner,
.btn.has-loading-spinner {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.loading-button-label {
  min-width: 0;
}

.is-area-loading {
  position: relative;
}

.loading-overlay {
  position: absolute;
  inset: 0;
  z-index: 5;
  display: grid;
  place-items: center;
  min-height: 120px;
  padding: 14px;
  border-radius: inherit;
  background: rgba(255, 255, 255, 0.72);
}

.loading-overlay-card {
  width: min(100%, 280px);
  box-shadow: 0 12px 30px rgba(17, 24, 39, 0.12);
}

.loading-skeleton-grid,
.loading-skeleton-form,
.loading-skeleton-table {
  width: 100%;
  display: grid;
  gap: 8px;
}

.loading-skeleton-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.loading-skeleton-grid span,
.loading-skeleton-form span,
.loading-skeleton-table span {
  display: block;
  min-height: 12px;
  border-radius: 8px;
  background: linear-gradient(90deg, #eef2f7 0%, #f8fafc 42%, #eef2f7 78%);
  background-size: 220% 100%;
  animation: loading-shimmer 1.2s ease-in-out infinite;
}

.loading-skeleton-grid span {
  min-height: 54px;
}

.loading-skeleton-form span:nth-child(1) {
  width: 58%;
}

.loading-skeleton-form span:nth-child(2) {
  min-height: 38px;
}

.loading-skeleton-form span:nth-child(3) {
  width: 42%;
  min-height: 34px;
}

.loading-skeleton-table {
  grid-template-columns: 0.8fr 1.2fr 0.9fr;
}

.loading-skeleton-table span {
  min-height: 15px;
}

@keyframes loading-spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

@keyframes loading-shimmer {
  0% {
    background-position: 120% 0;
  }
  100% {
    background-position: -120% 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .page-fade-ready body {
    opacity: 1;
    transform: none;
  }
}

/* Stage 5: accessibility baseline */
button,
input,
select,
textarea {
  font: inherit;
}

button,
.tab,
.back-home,
.search-clear,
.menu-button,
.install-button,
.chip,
.drawer a,
.btn,
.btn-action {
  min-height: 44px;
}

@media (max-width: 720px) {
  input:not([type="checkbox"]):not([type="radio"]),
  select,
  textarea {
    font-size: 16px;
  }
}

/* Minimalist UI system */
:root {
  --bg: #f7f8fa;
  --panel: #ffffff;
  --card: #ffffff;
  --ink: #111827;
  --muted: #6b7280;
  --accent: #2563eb;
  --accent-2: #0f766e;
  --accent-4: #dc2626;
  --line: #e5e7eb;
  --soft: #f3f4f6;
  --focus-ring: rgba(37, 99, 235, 0.22);
  --focus-ring-strong: rgba(37, 99, 235, 0.42);
}

html {
  background: var(--bg);
  color-scheme: light;
}

body {
  background: var(--bg);
  color: var(--ink);
  font-family: "Noto Sans", Arial, sans-serif;
  letter-spacing: 0;
}

body *,
body *::before,
body *::after {
  box-sizing: border-box;
  letter-spacing: 0;
  text-shadow: none !important;
}

a {
  color: var(--accent);
}

.skip-link {
  border: 1px solid #111827;
  border-radius: 8px;
  background: #111827;
  color: #ffffff;
  box-shadow: none;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
summary:focus-visible,
textarea:focus-visible {
  outline: 3px solid var(--focus-ring-strong);
  outline-offset: 2px;
  border-radius: 8px;
}

.page-footer {
  border-top-color: var(--line);
  color: var(--muted);
}

.page-footer a {
  color: inherit;
  font-weight: 700;
  text-decoration: none;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-top: 8px;
}

.brand-mark.brand-mark-fallback {
  width: 38px;
  height: 38px;
  min-width: 38px;
  border-radius: 8px;
  background: #1f2937;
  color: #ffffff;
  display: inline-grid;
  place-items: center;
  font-size: 13px;
  font-weight: 750;
}

.brand-mark.brand-mark-fallback img {
  display: none;
}

.alert,
.alert-error,
.alert-success {
  border-radius: 8px;
  box-shadow: none;
}

.alert-error {
  background: #fef2f2;
  border-color: #fecaca;
  color: #991b1b;
}

.alert-success {
  background: #ecfdf5;
  border-color: #bbf7d0;
  color: #166534;
}

/* Public tutorial share */
.tutorial-public-share-page {
  min-height: 100vh;
  background: #f3f4f6;
}

.tutorial-public-shell {
  width: min(1120px, calc(100% - 28px));
  margin: 0 auto;
  padding: 24px 0 40px;
}

.tutorial-public-article {
  overflow: hidden;
  border: 1px solid #d8dee6;
  border-radius: 8px;
  background: #ffffff;
  box-shadow: 0 16px 32px rgba(17, 24, 39, 0.08);
}

.tutorial-public-cover {
  min-height: 260px;
  aspect-ratio: 16 / 5.8;
  background:
    linear-gradient(135deg, rgba(15, 118, 110, 0.92), rgba(37, 99, 235, 0.78)),
    #1f2937;
}

.tutorial-public-cover--video {
  min-height: 0;
  aspect-ratio: 16 / 9;
}

.tutorial-public-cover img {
  width: 100%;
  height: 100%;
  min-height: 260px;
  object-fit: cover;
  display: block;
}

.tutorial-public-cover .tutorial-cover-embed,
.tutorial-public-cover .tutorial-cover-player,
.tutorial-public-cover .tutorial-cover-embed iframe,
.tutorial-public-cover .tutorial-youtube-poster,
.tutorial-public-cover .tutorial-youtube-poster img {
  width: 100%;
  height: 100%;
  min-height: 260px;
  display: block;
}

.tutorial-public-cover .tutorial-cover-embed iframe {
  border: 0;
  background: #0f172a;
}

.tutorial-public-cover > span {
  width: 100%;
  height: 100%;
  min-height: 260px;
  display: grid;
  place-items: center;
  padding: 24px;
  color: #ffffff;
  text-align: center;
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 800;
  line-height: 1.1;
}

.tutorial-public-header {
  display: grid;
  gap: 12px;
  padding: 24px;
  border-bottom: 1px solid #e5e7eb;
}

.tutorial-public-header h1 {
  max-width: 880px;
  margin: 0;
  color: #111827;
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.08;
}

.tutorial-public-header p {
  max-width: 820px;
  margin: 0;
  color: #4b5563;
  font-size: 16px;
  line-height: 1.62;
}

.tutorial-public-badges,
.tutorial-public-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tutorial-public-badges span,
.tutorial-public-tags span {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  border-radius: 999px;
  background: #eef2ff;
  color: #1f2937;
  padding: 4px 10px;
  font-size: 12px;
  font-weight: 800;
}

.tutorial-public-tags span {
  background: #f3f4f6;
  color: #4b5563;
}

.tutorial-public-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 330px);
  gap: 20px;
  padding: 24px;
}

.tutorial-public-content {
  min-width: 0;
}

.tutorial-public-content h2,
.tutorial-public-content h3,
.tutorial-public-side h2 {
  margin: 24px 0 10px;
  color: #111827;
  line-height: 1.2;
}

.tutorial-public-content h2:first-child,
.tutorial-public-content h3:first-child,
.tutorial-public-side h2:first-child {
  margin-top: 0;
}

.tutorial-public-content p,
.tutorial-public-content li,
.tutorial-public-content blockquote,
.tutorial-public-side p,
.tutorial-public-side li {
  color: #263241;
  font-size: 15px;
  line-height: 1.7;
}

.tutorial-public-content blockquote {
  margin: 16px 0;
  border-left: 4px solid #2563eb;
  background: #eff6ff;
  padding: 12px 14px;
  color: #1e3a8a;
}

.tutorial-public-content pre {
  overflow-x: auto;
  border-radius: 8px;
  background: #111827;
  color: #f9fafb;
  padding: 14px;
}

.tutorial-public-content code {
  border-radius: 6px;
  background: #eef2f7;
  padding: 1px 5px;
}

.tutorial-public-content a {
  color: #1d4ed8;
  font-weight: 800;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.tutorial-public-content a:hover,
.tutorial-public-content a:focus-visible {
  color: #1e40af;
}

.tutorial-public-content .tutorial-content-image {
  margin: 18px 0;
}

.tutorial-public-content .tutorial-content-image img,
.tutorial-public-content .tutorial-inline-image img {
  display: block;
  max-width: 100%;
  height: auto;
  border: 1px solid #d7e2ea;
  border-radius: 8px;
  background: #ffffff;
}

.tutorial-public-content .tutorial-content-image figcaption {
  margin-top: 6px;
  color: #64748b;
  font-size: 12px;
  font-weight: 800;
  line-height: 1.4;
}

.tutorial-public-content .tutorial-content-embed {
  margin: 18px 0;
}

.tutorial-public-content .tutorial-embed-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border: 1px solid #d7e2ea;
  border-radius: 8px;
  background: #0f172a;
}

.tutorial-public-content .tutorial-embed-frame iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.tutorial-public-content .tutorial-youtube-player,
.tutorial-public-cover .tutorial-youtube-player {
  position: relative;
  overflow: hidden;
  background: #0f172a;
}

.tutorial-youtube-fullscreen-lock {
  overflow: hidden;
}

.tutorial-public-content .tutorial-youtube-player.is-app-fullscreen,
.tutorial-public-cover .tutorial-youtube-player.is-app-fullscreen {
  position: fixed;
  inset: 0;
  z-index: 9999;
  width: 100vw;
  height: 100dvh;
  max-width: none;
  aspect-ratio: auto;
  display: grid;
  grid-template-rows: minmax(0, 1fr) auto;
  gap: 10px;
  padding: 12px;
  padding-top: max(12px, env(safe-area-inset-top));
  padding-right: max(12px, env(safe-area-inset-right));
  padding-bottom: max(12px, env(safe-area-inset-bottom));
  padding-left: max(12px, env(safe-area-inset-left));
  border: 0;
  border-radius: 0;
  background: #000000;
  box-sizing: border-box;
}

.tutorial-public-content .tutorial-youtube-player.is-app-fullscreen .tutorial-youtube-stage,
.tutorial-public-cover .tutorial-youtube-player.is-app-fullscreen .tutorial-youtube-stage {
  min-height: 0;
  height: 100%;
}

.tutorial-public-content .tutorial-youtube-player.is-app-fullscreen .tutorial-youtube-frame,
.tutorial-public-cover .tutorial-youtube-player.is-app-fullscreen .tutorial-youtube-frame {
  border-radius: 0;
}

.tutorial-public-content .tutorial-youtube-player.is-app-fullscreen .tutorial-youtube-controls,
.tutorial-public-cover .tutorial-youtube-player.is-app-fullscreen .tutorial-youtube-controls {
  position: static;
  inset: auto;
  width: 100%;
  margin: 0;
}

.tutorial-public-content .tutorial-youtube-poster,
.tutorial-public-cover .tutorial-youtube-poster {
  position: relative;
  width: 100%;
  height: 100%;
  display: block;
  border: 0;
  padding: 0;
  background: #0f172a;
  cursor: pointer;
  text-align: left;
}

.tutorial-public-content .tutorial-youtube-poster::after,
.tutorial-public-cover .tutorial-youtube-poster::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(15, 23, 42, 0.08), rgba(15, 23, 42, 0.54));
  pointer-events: none;
}

.tutorial-public-content .tutorial-youtube-poster img,
.tutorial-public-cover .tutorial-youtube-poster img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
}

.tutorial-public-content .tutorial-youtube-stage,
.tutorial-public-cover .tutorial-youtube-stage {
  position: relative;
  width: 100%;
  height: 100%;
}

.tutorial-public-content .tutorial-youtube-frame,
.tutorial-public-cover .tutorial-youtube-frame {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  background: #000000;
}

.tutorial-public-content .tutorial-youtube-frame iframe,
.tutorial-public-cover .tutorial-youtube-frame iframe {
  width: 100%;
  height: 100%;
  display: block;
  border: 0;
  background: #000000;
}

.tutorial-public-content .tutorial-youtube-overlay,
.tutorial-public-cover .tutorial-youtube-overlay {
  position: absolute;
  right: 16px;
  bottom: 16px;
  left: 16px;
  z-index: 1;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 12px;
  pointer-events: none;
}

.tutorial-public-content .tutorial-youtube-play,
.tutorial-public-cover .tutorial-youtube-play {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  padding: 0 16px;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.78);
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.22);
  backdrop-filter: blur(10px);
  color: #ffffff;
  font-size: 14px;
  font-weight: 800;
}

.tutorial-public-content .tutorial-youtube-play-icon,
.tutorial-public-cover .tutorial-youtube-play-icon {
  width: 0;
  height: 0;
  margin-left: 2px;
  border-top: 8px solid transparent;
  border-bottom: 8px solid transparent;
  border-left: 14px solid #ffffff;
}

.tutorial-public-content .tutorial-youtube-source,
.tutorial-public-cover .tutorial-youtube-source {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 0 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.9);
  color: #111827;
  font-size: 12px;
  font-weight: 800;
}

.tutorial-public-content .tutorial-youtube-player.is-playing .tutorial-youtube-poster,
.tutorial-public-cover .tutorial-youtube-player.is-playing .tutorial-youtube-poster {
  display: none;
}

.tutorial-public-content .tutorial-youtube-player.is-mounted .tutorial-youtube-poster,
.tutorial-public-cover .tutorial-youtube-player.is-mounted .tutorial-youtube-poster {
  display: none;
}

.tutorial-public-content .tutorial-youtube-controls,
.tutorial-public-cover .tutorial-youtube-controls {
  position: absolute;
  right: 12px;
  bottom: 12px;
  left: 12px;
  z-index: 2;
  display: grid;
  gap: 8px;
  padding: 10px 12px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 8px;
  background: rgba(15, 23, 42, 0.82);
  box-shadow: 0 12px 28px rgba(15, 23, 42, 0.28);
  backdrop-filter: blur(12px);
}

.tutorial-public-content .tutorial-youtube-controls-top,
.tutorial-public-cover .tutorial-youtube-controls-top {
  display: flex;
  align-items: center;
  gap: 10px;
}

.tutorial-public-content .tutorial-youtube-controls-actions,
.tutorial-public-cover .tutorial-youtube-controls-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.tutorial-public-content .tutorial-youtube-control-button,
.tutorial-public-cover .tutorial-youtube-control-button {
  width: 38px;
  min-width: 38px;
  height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  color: #ffffff;
  cursor: pointer;
}

.tutorial-public-content .tutorial-youtube-control-button:hover,
.tutorial-public-content .tutorial-youtube-control-button:focus-visible,
.tutorial-public-cover .tutorial-youtube-control-button:hover,
.tutorial-public-cover .tutorial-youtube-control-button:focus-visible {
  background: rgba(255, 255, 255, 0.16);
  border-color: rgba(255, 255, 255, 0.28);
  outline: none;
}

.tutorial-public-content .tutorial-youtube-control-svg,
.tutorial-public-cover .tutorial-youtube-control-svg {
  width: 18px;
  height: 18px;
  display: block;
}

.tutorial-public-content .tutorial-youtube-control-svg--pause,
.tutorial-public-content .tutorial-youtube-control-svg--mute,
.tutorial-public-content .tutorial-youtube-control-svg--compress,
.tutorial-public-cover .tutorial-youtube-control-svg--pause,
.tutorial-public-cover .tutorial-youtube-control-svg--mute,
.tutorial-public-cover .tutorial-youtube-control-svg--compress {
  display: none;
}

.tutorial-public-content .tutorial-youtube-player.is-playing [data-youtube-action="toggle"] .tutorial-youtube-control-svg--play,
.tutorial-public-cover .tutorial-youtube-player.is-playing [data-youtube-action="toggle"] .tutorial-youtube-control-svg--play,
.tutorial-public-content .tutorial-youtube-player.is-muted [data-youtube-action="mute"] .tutorial-youtube-control-svg--volume,
.tutorial-public-cover .tutorial-youtube-player.is-muted [data-youtube-action="mute"] .tutorial-youtube-control-svg--volume,
.tutorial-public-content .tutorial-youtube-player.is-fullscreen [data-youtube-action="fullscreen"] .tutorial-youtube-control-svg--expand,
.tutorial-public-cover .tutorial-youtube-player.is-fullscreen [data-youtube-action="fullscreen"] .tutorial-youtube-control-svg--expand {
  display: none;
}

.tutorial-public-content .tutorial-youtube-player.is-playing [data-youtube-action="toggle"] .tutorial-youtube-control-svg--pause,
.tutorial-public-cover .tutorial-youtube-player.is-playing [data-youtube-action="toggle"] .tutorial-youtube-control-svg--pause,
.tutorial-public-content .tutorial-youtube-player.is-muted [data-youtube-action="mute"] .tutorial-youtube-control-svg--mute,
.tutorial-public-cover .tutorial-youtube-player.is-muted [data-youtube-action="mute"] .tutorial-youtube-control-svg--mute,
.tutorial-public-content .tutorial-youtube-player.is-fullscreen [data-youtube-action="fullscreen"] .tutorial-youtube-control-svg--compress,
.tutorial-public-cover .tutorial-youtube-player.is-fullscreen [data-youtube-action="fullscreen"] .tutorial-youtube-control-svg--compress {
  display: block;
}

.tutorial-public-content .tutorial-youtube-time,
.tutorial-public-cover .tutorial-youtube-time {
  margin-left: auto;
  color: #ffffff;
  font-size: 12px;
  font-weight: 800;
  white-space: nowrap;
}

.tutorial-public-content .tutorial-youtube-time-separator,
.tutorial-public-cover .tutorial-youtube-time-separator {
  margin: 0 5px;
  color: rgba(255, 255, 255, 0.72);
}

.tutorial-public-content .tutorial-youtube-seek,
.tutorial-public-cover .tutorial-youtube-seek {
  width: 100%;
  margin: 0;
  -webkit-appearance: none;
  appearance: none;
  background: transparent;
  accent-color: #f59e0b;
  --youtube-progress: 0%;
}

.tutorial-public-content .tutorial-youtube-seek::-webkit-slider-runnable-track,
.tutorial-public-cover .tutorial-youtube-seek::-webkit-slider-runnable-track {
  height: 4px;
  border-radius: 999px;
  background: linear-gradient(90deg, #f59e0b var(--youtube-progress), rgba(255, 255, 255, 0.22) 0);
}

.tutorial-public-content .tutorial-youtube-seek::-webkit-slider-thumb,
.tutorial-public-cover .tutorial-youtube-seek::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  margin-top: -5px;
  border: 2px solid #f59e0b;
  border-radius: 999px;
  background: #ffffff;
}

.tutorial-public-content .tutorial-youtube-seek::-moz-range-track,
.tutorial-public-cover .tutorial-youtube-seek::-moz-range-track {
  height: 4px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.22);
}

.tutorial-public-content .tutorial-youtube-seek::-moz-range-progress,
.tutorial-public-cover .tutorial-youtube-seek::-moz-range-progress {
  height: 4px;
  border-radius: 999px;
  background: #f59e0b;
}

.tutorial-public-content .tutorial-youtube-seek::-moz-range-thumb,
.tutorial-public-cover .tutorial-youtube-seek::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border: 2px solid #f59e0b;
  border-radius: 999px;
  background: #ffffff;
}

.tutorial-public-content .tutorial-youtube-seek:disabled,
.tutorial-public-cover .tutorial-youtube-seek:disabled {
  opacity: 0.45;
}

.tutorial-public-content .tutorial-content-embed figcaption {
  margin-top: 6px;
  color: #64748b;
  font-size: 12px;
  font-weight: 800;
  line-height: 1.4;
}

.tutorial-public-content pre code {
  background: transparent;
  padding: 0;
}

.tutorial-public-content .tutorial-check-list,
.tutorial-public-side .tutorial-plain-list {
  padding-left: 20px;
}

.tutorial-public-content .tutorial-check-list {
  list-style: none;
  padding-left: 0;
}

.tutorial-public-content .tutorial-check-list li {
  display: flex;
  gap: 9px;
  align-items: flex-start;
}

.tutorial-public-content .tutorial-checkmark {
  flex: 0 0 auto;
  color: #0f766e;
  font-weight: 900;
}

.tutorial-public-side {
  display: grid;
  gap: 14px;
  align-content: start;
}

.tutorial-public-side section {
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  background: #f9fafb;
  padding: 14px;
}

.tutorial-public-muted,
.tutorial-public-side .tutorial-empty {
  color: #6b7280;
  font-size: 13px;
  font-weight: 700;
}

.tutorial-public-attachment,
.tutorial-public-audio {
  width: 100%;
  border: 1px solid #d8dee6;
  border-radius: 8px;
  background: #ffffff;
}

.tutorial-public-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  margin-top: 10px;
  border: 1px solid #cbd5e1;
  border-radius: 8px;
  background: #ffffff;
  color: #111827;
  padding: 8px 12px;
  font-weight: 800;
}

@media (max-width: 860px) {
  .tutorial-public-layout {
    grid-template-columns: 1fr;
  }

  .tutorial-public-cover,
  .tutorial-public-cover img,
  .tutorial-public-cover span {
    min-height: 210px;
  }

  .tutorial-public-cover--video,
  .tutorial-public-cover--video .tutorial-cover-embed,
  .tutorial-public-cover--video .tutorial-cover-player,
  .tutorial-public-cover--video .tutorial-cover-embed iframe,
  .tutorial-public-cover--video .tutorial-youtube-poster,
  .tutorial-public-cover--video .tutorial-youtube-poster img {
    min-height: 0;
  }
}

@media (max-width: 620px) {
  .tutorial-public-shell {
    width: 100%;
    padding: 0;
  }

  .tutorial-public-article {
    border-radius: 0;
    border-left: 0;
    border-right: 0;
  }

  .tutorial-public-header,
  .tutorial-public-layout {
    padding: 18px;
  }

  .tutorial-public-content .tutorial-youtube-overlay,
  .tutorial-public-cover .tutorial-youtube-overlay {
    right: 12px;
    bottom: 12px;
    left: 12px;
    gap: 8px;
  }

  .tutorial-public-content .tutorial-youtube-play,
  .tutorial-public-cover .tutorial-youtube-play {
    width: 46px;
    min-width: 46px;
    min-height: 46px;
    padding: 0;
    justify-content: center;
    border-radius: 999px;
    font-size: 0;
  }

  .tutorial-public-content .tutorial-youtube-source,
  .tutorial-public-cover .tutorial-youtube-source {
    display: none;
  }

  .tutorial-public-content .tutorial-youtube-play > span:last-child,
  .tutorial-public-cover .tutorial-youtube-play > span:last-child {
    display: none;
  }

  .tutorial-public-content .tutorial-youtube-play-icon,
  .tutorial-public-cover .tutorial-youtube-play-icon {
    margin-left: 3px;
    border-top-width: 7px;
    border-bottom-width: 7px;
    border-left-width: 12px;
  }

  .tutorial-public-content .tutorial-youtube-controls,
  .tutorial-public-cover .tutorial-youtube-controls {
    right: 8px;
    bottom: 8px;
    left: 8px;
    display: block;
    gap: 0;
    padding: 0;
    border: 0;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
    backdrop-filter: none;
  }

  .tutorial-public-content .tutorial-youtube-controls-top,
  .tutorial-public-cover .tutorial-youtube-controls-top {
    gap: 6px;
    min-height: 38px;
    padding: 0 8px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 10px;
    background: rgba(15, 23, 42, 0.88);
    box-shadow: 0 8px 18px rgba(15, 23, 42, 0.26);
    backdrop-filter: blur(10px);
  }

  .tutorial-public-content .tutorial-youtube-controls-actions,
  .tutorial-public-cover .tutorial-youtube-controls-actions {
    gap: 4px;
  }

  .tutorial-public-content .tutorial-youtube-control-button,
  .tutorial-public-cover .tutorial-youtube-control-button {
    width: 30px;
    min-width: 30px;
    height: 30px;
    border-color: rgba(255, 255, 255, 0.08);
    background: transparent;
  }

  .tutorial-public-content .tutorial-youtube-control-svg,
  .tutorial-public-cover .tutorial-youtube-control-svg {
    width: 15px;
    height: 15px;
  }

  .tutorial-public-content .tutorial-youtube-time,
  .tutorial-public-cover .tutorial-youtube-time {
    font-size: 10px;
  }

  .tutorial-public-content .tutorial-youtube-seek,
  .tutorial-public-cover .tutorial-youtube-seek {
    position: absolute;
    right: 0;
    bottom: 42px;
    left: 0;
    width: auto;
    margin: 0 10px;
  }

  .tutorial-public-content .tutorial-youtube-controls [data-youtube-action="mute"],
  .tutorial-public-cover .tutorial-youtube-controls [data-youtube-action="mute"] {
    display: none;
  }

  .tutorial-public-content .tutorial-youtube-player.is-app-fullscreen .tutorial-youtube-controls,
  .tutorial-public-cover .tutorial-youtube-player.is-app-fullscreen .tutorial-youtube-controls {
    position: static;
  }

  .tutorial-public-content .tutorial-youtube-player.is-app-fullscreen .tutorial-youtube-controls-top,
  .tutorial-public-cover .tutorial-youtube-player.is-app-fullscreen .tutorial-youtube-controls-top {
    padding: 0 10px;
  }

  .tutorial-public-content .tutorial-youtube-player.is-app-fullscreen .tutorial-youtube-seek,
  .tutorial-public-cover .tutorial-youtube-player.is-app-fullscreen .tutorial-youtube-seek {
    position: static;
    width: 100%;
    margin: 0;
  }

  .tutorial-public-content .tutorial-youtube-player.is-app-fullscreen .tutorial-youtube-controls [data-youtube-action="mute"],
  .tutorial-public-cover .tutorial-youtube-player.is-app-fullscreen .tutorial-youtube-controls [data-youtube-action="mute"] {
    display: inline-flex;
  }
}