/* ============================================================
   pdf.js reader
   ============================================================ */

:root {
  --topbar-h: 58px;
  --sidebar-w: 236px;
  --viewer-bg: #e9e5db;
  --page-shadow: 0 1px 2px rgba(23, 33, 31, 0.08),
    0 18px 42px -22px rgba(23, 33, 31, 0.42);
}

html,
body {
  height: 100%;
}

.viewer-body {
  height: 100dvh;
  overflow: hidden;
  background: var(--viewer-bg);
  overscroll-behavior: none;
}

.app {
  height: 100dvh;
  display: flex;
  flex-direction: column;
}

/* --- top bar ----------------------------------------------- */

.topbar {
  position: relative;
  z-index: 30;
  flex: none;
  height: var(--topbar-h);
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: 12px;
  padding: 0 12px;
  background: rgba(250, 248, 242, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px) saturate(1.15);
  -webkit-backdrop-filter: blur(14px) saturate(1.15);
  transition: box-shadow 0.2s ease;
}

.topbar.is-scrolled {
  box-shadow: 0 10px 24px -20px rgba(23, 33, 31, 0.5);
}

.tb-left,
.tb-right {
  display: flex;
  align-items: center;
  gap: 3px;
  min-width: 0;
}

.tb-right {
  justify-content: flex-end;
}

.icon-btn {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  flex: none;
  border-radius: 8px;
  color: var(--ink-soft);
  text-decoration: none;
  transition: background-color 0.16s ease, color 0.16s ease;
}

.icon-btn:hover {
  background: rgba(23, 33, 31, 0.065);
  color: var(--ink);
}

.icon-btn svg {
  width: 18px;
  height: 18px;
}

.doc-meta {
  display: flex;
  flex-direction: column;
  gap: 1px;
  min-width: 0;
  margin-left: 6px;
  padding-right: 8px;
}

.doc-title {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.doc-sub {
  font-size: 10.5px;
  letter-spacing: 0.03em;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* pager */

.pager {
  display: flex;
  align-items: center;
  gap: 1px;
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.6);
}

.pager-btn {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: var(--ink-soft);
  transition: background-color 0.16s ease, color 0.16s ease;
}

.pager-btn:hover {
  background: rgba(23, 33, 31, 0.07);
  color: var(--ink);
}

.pager-btn svg {
  width: 15px;
  height: 15px;
}

.page-input {
  width: 46px;
  height: 28px;
  padding: 0 2px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  font-family: var(--sans);
  font-size: 12.5px;
  font-variant-numeric: tabular-nums;
  text-align: center;
  color: var(--ink);
}

.page-input:hover {
  background: rgba(23, 33, 31, 0.05);
}

.page-input:focus {
  outline: none;
  background: #fff;
  box-shadow: inset 0 0 0 1px var(--accent);
}

.page-total {
  padding: 0 9px 0 3px;
  font-size: 11.5px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

/* zoom */

.zoom-group {
  display: flex;
  align-items: center;
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.6);
}

.zoom-btn {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  font-size: 15px;
  line-height: 1;
  color: var(--ink-soft);
  transition: background-color 0.16s ease, color 0.16s ease;
}

.zoom-btn:hover {
  background: rgba(23, 33, 31, 0.07);
  color: var(--ink);
}

.zoom-btn:disabled {
  opacity: 0.32;
  cursor: default;
  background: transparent;
}

.zoom-btn svg {
  width: 15px;
  height: 15px;
}

.zoom-value {
  min-width: 48px;
  height: 28px;
  padding: 0 4px;
  border-radius: 999px;
  font-size: 11.5px;
  font-variant-numeric: tabular-nums;
  color: var(--ink-soft);
  transition: background-color 0.16s ease, color 0.16s ease;
}

.zoom-value:hover {
  background: rgba(23, 33, 31, 0.07);
  color: var(--ink);
}

.tb-sep {
  width: 1px;
  height: 20px;
  margin: 0 4px;
  background: var(--line);
}

/* --- progress rail ----------------------------------------- */

.progress-rail {
  flex: none;
  height: 2px;
  background: rgba(23, 33, 31, 0.08);
  z-index: 29;
}

.progress-bar {
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, var(--accent), #46c3ad);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 0.08s linear;
}

/* --- workspace --------------------------------------------- */

.workspace {
  flex: 1;
  min-height: 0;
  display: flex;
  position: relative;
}

/* sidebar */

.sidebar {
  flex: none;
  width: var(--sidebar-w);
  display: flex;
  flex-direction: column;
  min-height: 0;
  background: rgba(247, 244, 237, 0.9);
  border-right: 1px solid var(--line);
  z-index: 24;
}

.app.sidebar-collapsed .sidebar {
  display: none;
}

.sidebar-head {
  flex: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 13px 16px 9px;
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.thumbs {
  position: relative;
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 2px 12px 24px;
  scrollbar-width: thin;
  scrollbar-color: rgba(23, 33, 31, 0.22) transparent;
}

.thumb {
  display: block;
  width: 100%;
  margin: 0 0 10px;
  padding: 5px;
  border-radius: 8px;
  text-align: center;
  transition: background-color 0.16s ease;
}

.thumb:hover {
  background: rgba(23, 33, 31, 0.05);
}

.thumb-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 612 / 792;
  border: 1px solid rgba(23, 33, 31, 0.14);
  border-radius: 2px;
  background: #fff;
  overflow: hidden;
  box-shadow: 0 2px 6px rgba(23, 33, 31, 0.07);
  transition: border-color 0.16s ease, box-shadow 0.16s ease;
}

.thumb-frame img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity 0.25s ease;
}

.thumb.is-rendered .thumb-frame img {
  opacity: 1;
}

.thumb-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(100deg, #f2efe8 20%, #faf8f3 40%, #f2efe8 60%);
  background-size: 220% 100%;
  animation: shimmer 1.8s linear infinite;
  transition: opacity 0.25s ease;
}

.thumb.is-rendered .thumb-frame::after {
  opacity: 0;
}

.thumb-num {
  display: block;
  margin-top: 5px;
  font-size: 10px;
  font-variant-numeric: tabular-nums;
  color: var(--muted);
  transition: color 0.16s ease;
}

.thumb.is-active .thumb-frame {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(14, 138, 122, 0.26),
    0 6px 14px -6px rgba(14, 138, 122, 0.4);
}

.thumb.is-active .thumb-num {
  color: var(--accent-deep);
  font-weight: 600;
}

/* viewport + scroller */

.viewport {
  position: relative;
  flex: 1;
  min-width: 0;
  display: flex;
}

.scroller {
  position: relative;
  flex: 1;
  overflow: auto;
  overscroll-behavior: contain;
  padding: 26px 22px 90px;
  scrollbar-width: thin;
  scrollbar-color: rgba(23, 33, 31, 0.28) transparent;
  background: var(--viewer-bg);
}

.scroller:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}

.scroller::-webkit-scrollbar {
  width: 12px;
  height: 12px;
}

.scroller::-webkit-scrollbar-thumb {
  background: rgba(23, 33, 31, 0.24);
  border: 3px solid var(--viewer-bg);
  border-radius: 999px;
}

.scroller::-webkit-scrollbar-thumb:hover {
  background: rgba(23, 33, 31, 0.36);
}

.pages {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 26px;
  min-height: 100%;
}

.page {
  position: relative;
  flex: none;
  width: var(--page-w, 612px);
  margin: 0 auto;
  background: #fff;
  border-radius: 2px;
  box-shadow: var(--page-shadow);
  overflow: hidden;
  aspect-ratio: 612 / 792;
}

.page::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background: linear-gradient(100deg, #f4f1ea 20%, #fbfaf5 40%, #f4f1ea 60%);
  background-size: 220% 100%;
  animation: shimmer 1.8s linear infinite;
  transition: opacity 0.3s ease;
}

.page.is-rendered::before {
  opacity: 0;
  animation: none;
}

.page canvas {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  height: auto;
}

/* --- pdf.js text layer ------------------------------------- */

.textLayer {
  position: absolute;
  inset: 0;
  z-index: 2;
  overflow: hidden;
  opacity: 1;
  line-height: 1;
  text-align: initial;
  text-size-adjust: none;
  -webkit-text-size-adjust: none;
  forced-color-adjust: none;
  transform-origin: 0 0;
  caret-color: CanvasText;
}

.textLayer :is(span, br) {
  color: transparent;
  position: absolute;
  white-space: pre;
  cursor: text;
  transform-origin: 0% 0%;
}

.textLayer ::selection {
  background: rgba(14, 138, 122, 0.26);
  background: color-mix(in srgb, var(--accent) 28%, transparent);
}

.textLayer br::selection {
  background: transparent;
}

.textLayer .endOfContent {
  display: block;
  position: absolute;
  inset: 100% 0 0;
  z-index: 0;
  cursor: default;
  user-select: none;
}

/* --- link annotations -------------------------------------- */

.linkLayer {
  position: absolute;
  inset: 0;
  z-index: 3;
  pointer-events: none;
}

.linkLayer a {
  position: absolute;
  display: block;
  pointer-events: auto;
  border-radius: 2px;
  background: rgba(14, 138, 122, 0);
  transition: background-color 0.15s ease;
}

.linkLayer a:hover {
  background: rgba(14, 138, 122, 0.12);
}

/* --- loading / error --------------------------------------- */

.load-overlay {
  position: absolute;
  inset: 0;
  z-index: 20;
  display: grid;
  place-items: center;
  padding: 24px;
  background: #f6f3eb;
  transition: opacity 0.38s ease, visibility 0.38s ease;
}

.load-overlay.is-hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loader {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  text-align: center;
}

.spinner {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 2px solid rgba(23, 33, 31, 0.12);
  border-top-color: var(--accent);
  animation: spin 0.75s linear infinite;
}

.load-title {
  font-size: 13.5px;
  color: var(--ink-soft);
  letter-spacing: 0.02em;
}

.load-bar {
  width: 190px;
  height: 3px;
  border-radius: 99px;
  background: rgba(23, 33, 31, 0.1);
  overflow: hidden;
}

.load-bar span {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: var(--accent);
  transition: width 0.2s ease;
}

.load-pct {
  font-size: 11px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.load-error {
  max-width: 460px;
  text-align: center;
}

.error-icon {
  width: 40px;
  height: 40px;
  margin: 0 auto 16px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: rgba(180, 83, 45, 0.12);
  color: #a24a26;
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 700;
}

.load-error h2 {
  margin-bottom: 10px;
  font-family: var(--serif);
  font-size: 21px;
  font-weight: 700;
}

.load-error > p {
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--muted);
}

.load-error .hint {
  margin-top: 12px;
  padding: 12px 14px;
  border: 1px dashed rgba(23, 33, 31, 0.18);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.5);
  font-size: 12.5px;
  line-height: 1.75;
  text-align: left;
}

.load-error code {
  padding: 1px 5px;
  border-radius: 4px;
  background: rgba(23, 33, 31, 0.07);
  font-family: var(--mono);
  font-size: 11.5px;
}

.error-actions {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-top: 18px;
}

.btn-small {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 38px;
  padding: 0 18px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  font-size: 13px;
  text-decoration: none;
  color: var(--ink);
  background: transparent;
  transition: background-color 0.16s ease;
}

.btn-small:hover {
  background: rgba(23, 33, 31, 0.05);
}

.btn-small.primary {
  background: var(--ink);
  border-color: var(--ink);
  color: #f7f4ec;
}

.btn-small.primary:hover {
  background: #0b1513;
}

/* --- floating to-top --------------------------------------- */

.to-top {
  position: absolute;
  right: 20px;
  bottom: 20px;
  z-index: 16;
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.94);
  border: 1px solid var(--line);
  color: var(--ink-soft);
  box-shadow: 0 8px 20px -10px rgba(23, 33, 31, 0.4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s ease,
    background-color 0.16s ease;
}

.to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.to-top:hover {
  background: #fff;
  color: var(--ink);
}

.to-top svg {
  width: 17px;
  height: 17px;
}

/* --- backdrop & file warning ------------------------------- */

.backdrop {
  display: none;
}

.file-warning {
  display: none;
}

html.file-protocol .app {
  display: none;
}

html.file-protocol .file-warning {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  padding: 24px;
  background: var(--paper);
}

.file-warning-card {
  max-width: 520px;
  padding: 30px 32px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--paper-soft);
  box-shadow: var(--shadow-soft);
}

.file-warning-card h1 {
  margin-bottom: 12px;
  font-family: var(--serif);
  font-size: 24px;
}

.file-warning-card p {
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--muted);
}

.file-warning-card p + p {
  margin-top: 10px;
}

.file-warning-card code {
  padding: 2px 6px;
  border-radius: 5px;
  background: rgba(23, 33, 31, 0.07);
  font-family: var(--mono);
  font-size: 12px;
}

.file-warning-card .btn-small {
  margin-top: 20px;
}

/* --- animations -------------------------------------------- */

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

@keyframes shimmer {
  from {
    background-position: 130% 0;
  }
  to {
    background-position: -90% 0;
  }
}

/* --- responsive -------------------------------------------- */

@media (max-width: 860px) {
  :root {
    --topbar-h: 54px;
  }

  .topbar {
    padding: 0 6px;
    gap: 6px;
  }

  .doc-meta {
    display: none;
  }

  .zoom-group,
  .tb-sep,
  .tb-right .fullscreen-btn {
    display: none;
  }

  .pager {
    padding: 2px;
  }

  .page-total {
    font-size: 11px;
    padding-right: 7px;
  }

  .sidebar {
    position: fixed;
    top: var(--topbar-h);
    bottom: 0;
    left: 0;
    width: min(300px, 86vw);
    transform: translateX(-102%);
    transition: transform 0.28s cubic-bezier(0.2, 0.7, 0.2, 1);
    box-shadow: 24px 0 60px -30px rgba(23, 33, 31, 0.55);
    background: #f7f4ed;
  }

  .app.sidebar-open .sidebar {
    transform: none;
  }

  .app.sidebar-collapsed .sidebar {
    display: flex;
  }

  .backdrop {
    display: block;
    position: fixed;
    inset: var(--topbar-h) 0 0;
    z-index: 22;
    background: rgba(15, 23, 21, 0.32);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s ease, visibility 0.25s ease;
  }

  .app.sidebar-open .backdrop {
    opacity: 1;
    visibility: visible;
  }

  .scroller {
    padding: 14px 10px 72px;
  }

  .pages {
    gap: 14px;
  }

  .to-top {
    right: 14px;
    bottom: 14px;
  }

  .thumbs {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 4px 8px;
    align-content: start;
    padding: 2px 10px 24px;
  }

  .thumb {
    margin: 0;
    padding: 4px;
    border-radius: 6px;
  }

  .thumb-num {
    margin-top: 3px;
    font-size: 9.5px;
  }
}

@media (max-width: 420px) {
  .tb-left .back-btn + .icon-btn {
    margin-left: -4px;
  }

  .pager {
    gap: 0;
  }

  .page-input {
    width: 38px;
  }
}