:root {
  --background: #edf0ec;
  --background-soft: #f8faf7;
  --ink: #18211f;
  --muted: #66716d;
  --panel: rgba(250, 252, 249, 0.9);
  --panel-solid: #fbfcfa;
  --border: rgba(24, 33, 31, 0.14);
  --button: rgba(250, 252, 249, 0.88);
  --button-hover: #ffffff;
  --shadow: 0 18px 50px rgba(24, 33, 31, 0.18);
  --paper-shadow: 0 8px 30px rgba(24, 33, 31, 0.16);
  --accent: #0f766e;
  --pdf-filter: none;
}

:root[data-theme="dark"] {
  --background: #111816;
  --background-soft: #19221f;
  --ink: #eef5f1;
  --muted: #a8b6b0;
  --panel: rgba(23, 32, 29, 0.9);
  --panel-solid: #17201d;
  --border: rgba(238, 245, 241, 0.16);
  --button: rgba(23, 32, 29, 0.9);
  --button-hover: #22302b;
  --shadow: 0 20px 70px rgba(0, 0, 0, 0.34);
  --paper-shadow: 0 8px 34px rgba(0, 0, 0, 0.36);
  --accent: #5eead4;
  --pdf-filter: invert(0.9) hue-rotate(180deg) saturate(0.86) brightness(0.94) contrast(0.92);
}

* {
  box-sizing: border-box;
}

html {
  background: var(--background);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background:
    radial-gradient(circle at 16px 16px, rgba(15, 118, 110, 0.08), transparent 24px),
    linear-gradient(180deg, var(--background-soft), var(--background));
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

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

.pdf-site {
  min-height: 100vh;
  padding: 0;
}

.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 40;
  width: 100%;
  height: 3px;
  background: color-mix(in srgb, var(--ink), transparent 92%);
}

.progress-bar-fill {
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, var(--accent), color-mix(in srgb, var(--accent), white 20%));
  transform-origin: left center;
  transition: width 80ms linear;
}

.side-controls {
  position: fixed;
  top: max(18px, env(safe-area-inset-top));
  left: max(12px, env(safe-area-inset-left));
  z-index: 30;
  display: grid;
  gap: 10px;
}

.control-button {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--ink);
  background: var(--button);
  box-shadow: 0 10px 26px rgba(24, 33, 31, 0.12);
  backdrop-filter: blur(16px);
  cursor: pointer;
  font: 700 20px/1 ui-sans-serif, system-ui, sans-serif;
  text-decoration: none;
  transition: transform 160ms ease, background 160ms ease, border-color 160ms ease;
}

.control-button:hover {
  background: var(--button-hover);
  transform: translateY(-1px);
}

.control-button:focus-visible,
.theme-toggle:focus-visible,
.toc-close:focus-visible,
.search-button:focus-visible,
.toc-link:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent), transparent 42%);
  outline-offset: 3px;
}

.toc-panel {
  position: fixed;
  inset: 0;
  z-index: 25;
  display: grid;
  align-items: start;
  justify-items: center;
  padding: max(76px, env(safe-area-inset-top) + 70px) 14px 24px;
  background: rgba(13, 18, 17, 0.2);
  backdrop-filter: blur(5px);
}

.toc-panel[hidden] {
  display: none;
}

.search-card {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  min-width: 0;
  padding: 6px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--button);
  box-shadow: none;
  backdrop-filter: blur(16px);
}

.search-count {
  margin-top: 8px;
  padding: 0 14px;
  color: var(--muted);
  font: 600 12px/1.2 ui-sans-serif, system-ui, sans-serif;
  text-align: center;
}

.search-count:empty {
  display: none;
}

.search-input {
  flex: 1;
  min-width: 0;
  border: 0;
  background: transparent;
  color: var(--ink);
  font: 600 15px/1.2 ui-sans-serif, system-ui, sans-serif;
  outline: none;
}

.search-input::placeholder {
  color: var(--muted);
}

.search-actions {
  display: flex;
  gap: 6px;
}

.search-button {
  height: 34px;
  padding: 0 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--ink);
  background: var(--button);
  cursor: pointer;
  font: 650 13px/1 ui-sans-serif, system-ui, sans-serif;
}

.search-button:hover {
  background: var(--button-hover);
}

.toc-card {
  width: min(92vw, 620px);
  max-height: min(72vh, 680px);
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(20px);
}

.toc-header {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  padding: 14px 14px 10px;
  border-bottom: 1px solid var(--border);
}

.toc-card.is-searching .toc-header {
  grid-template-columns: minmax(0, 1fr) auto;
}

.toc-card.is-searching .theme-toggle,
.toc-card.is-searching .toc-list {
  display: none;
}

.toc-panel.is-searching {
  padding: max(14px, env(safe-area-inset-top)) 10px 0;
  background: transparent;
  backdrop-filter: none;
}

.toc-panel.is-searching .toc-card {
  width: min(92vw, 620px);
  max-height: none;
  overflow: visible;
  border-radius: 999px;
  box-shadow: var(--shadow);
}

.toc-panel.is-searching .toc-header {
  padding: 8px;
  border-bottom: 0;
}

.toc-panel.is-searching .search-count {
  margin-top: 4px;
}

.theme-toggle {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--ink);
  background: var(--button);
  cursor: pointer;
  font: 700 18px/1 ui-sans-serif, system-ui, sans-serif;
}

.theme-toggle:hover {
  background: var(--button-hover);
}

.toc-close {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--ink);
  background: transparent;
  cursor: pointer;
  font: 500 24px/1 ui-sans-serif, system-ui, sans-serif;
}

.toc-list {
  display: block;
  max-height: calc(min(72vh, 680px) - 104px);
  overflow: auto;
  padding: 12px;
}

.toc-tree {
  list-style: none;
  margin: 0;
  padding: 0;
}

.toc-tree > li + li {
  margin-top: 4px;
}

.toc-tree .toc-tree {
  margin-left: 14px;
  padding-left: 12px;
  border-left: 1px solid color-mix(in srgb, var(--border), transparent 10%);
}

.toc-entry {
  display: flex;
  align-items: center;
  gap: 8px;
}

.toc-link {
  flex: 1;
  display: block;
  width: 100%;
  min-height: 42px;
  padding: 11px 12px;
  border: 0;
  border-radius: 12px;
  color: var(--ink);
  background: transparent;
  cursor: pointer;
  font: 650 14px/1.35 ui-sans-serif, system-ui, sans-serif;
  text-align: left;
}

.toc-copy {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  flex: 0 0 auto;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--muted);
  background: var(--button);
  cursor: pointer;
  font: 700 15px/1 ui-sans-serif, system-ui, sans-serif;
}

.toc-copy:hover {
  background: var(--button-hover);
  color: var(--ink);
}

.toc-link:hover {
  background: color-mix(in srgb, var(--accent), transparent 88%);
}

.toc-link[data-depth="1"] {
  padding-left: 28px;
  color: var(--muted);
  font-weight: 620;
}

.toc-link[data-depth="2"] {
  padding-left: 44px;
  color: var(--muted);
  font-weight: 560;
}

.status {
  position: fixed;
  inset: 50% auto auto 50%;
  z-index: 12;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 40px;
  padding: 0 16px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--muted);
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
  transform: translate(-50%, -50%);
  font: 600 13px/1.2 ui-sans-serif, system-ui, sans-serif;
  letter-spacing: 0;
  white-space: nowrap;
}

.status:empty {
  display: none;
}

.status::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: var(--accent);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent), transparent 82%);
}

.viewer {
  display: grid;
  justify-items: stretch;
  gap: 0;
  width: 100%;
}

.pdf-page-shell {
  position: relative;
  display: block;
  width: 100%;
  height: auto;
  background: #ffffff;
  box-shadow: var(--paper-shadow);
  filter: var(--pdf-filter);
}

.pdf-page {
  display: block;
  width: 100%;
  height: auto;
}

.pdf-page-shell + .pdf-page-shell {
  margin-top: 12px;
}

.annotationLayer {
  position: absolute;
  inset: 0;
  transform-origin: 0 0;
}

.annotationLayer section {
  position: absolute;
  box-sizing: border-box;
  margin: 0;
  transform-origin: 0 0;
}

.annotationLayer a {
  position: absolute;
  display: block;
  width: 100%;
  height: 100%;
  color: transparent;
  text-decoration: none;
}

.annotationLayer a:hover {
  background: rgba(15, 118, 110, 0.12);
}

.searchHighlightLayer {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.searchHighlight {
  position: absolute;
  background: rgba(255, 214, 102, 0.55);
  border-radius: 3px;
  mix-blend-mode: multiply;
}

.pdf-fallback {
  display: block;
  width: 100%;
  min-height: 100vh;
  border: 0;
  background: #ffffff;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 720px) {
  .opening-stage {
    grid-template-columns: 1fr;
    width: min(100vw - 32px, 560px);
    gap: 28px;
    padding: 28px 0 40px;
  }

  .opening-scroll {
    width: min(100%, 460px);
  }

  .opening-copy {
    text-align: center;
    justify-self: center;
  }

  .opening-text {
    margin-left: auto;
    margin-right: auto;
  }

  .opening-button {
    width: min(100%, 320px);
  }

  body {
    background: var(--background);
  }

  .side-controls {
    top: auto;
    bottom: max(14px, env(safe-area-inset-bottom));
    left: max(10px, env(safe-area-inset-left));
    gap: 8px;
  }

  .control-button {
    width: 44px;
    height: 44px;
    font-size: 18px;
  }

  .toc-panel {
    align-items: end;
    padding: 18px 10px max(72px, env(safe-area-inset-bottom) + 64px);
  }

  .toc-card {
    width: min(100%, 560px);
    max-height: min(76vh, 620px);
    border-radius: 16px;
  }

  .search-card {
    width: 100%;
    border-radius: 20px;
    padding: 9px 10px;
  }

  .search-count {
    padding: 0 10px;
  }

  .search-actions {
    gap: 4px;
  }

  .search-button {
    padding: 0 10px;
  }

  .toc-header {
    padding: 15px 15px 10px;
  }

  .toc-list {
    max-height: calc(min(76vh, 620px) - 96px);
    padding: 10px;
  }

  .toc-link {
    min-height: 46px;
    padding-top: 13px;
    padding-bottom: 13px;
  }

  .pdf-page-shell + .pdf-page-shell {
    margin-top: 8px;
  }
}