:root {
  color-scheme: light;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #192637;
  background: #edf2f7;
  --ink: #192637;
  --muted: #718093;
  --teal: #285f6b;
  --teal-dark: #1e4c57;
  --line: #d4dde5;
  --gold: #bd7b20;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

* {
  box-sizing: border-box;
}

body {
  min-width: 320px;
  min-height: 100vh;
  min-height: 100dvh;
  margin: 0;
  background:
    radial-gradient(ellipse at 10% 0%, rgb(210 225 241 / 70%), transparent 38rem),
    radial-gradient(ellipse at 100% 100%, rgb(218 234 229 / 55%), transparent 36rem),
    #edf2f7;
}

main {
  display: flex;
  width: 100%;
  height: 100vh;
  height: 100dvh;
  flex-direction: column;
  gap: 0;
  margin: 0 auto;
  padding: 8px 12px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: inherit;
  text-decoration: none;
}

.brand-mark {
  display: block;
  width: 36px;
  height: 36px;
  flex: 0 0 auto;
  border-radius: 24%;
  object-fit: cover;
  box-shadow: 0 3px 10px rgb(35 75 89 / 16%);
}

h1 {
  margin: 0;
  font-size: 0.98rem;
  letter-spacing: -0.025em;
}

.tagline {
  display: block;
  margin-top: 1px;
  color: #718093;
  font-size: 0.68rem;
}

.panel {
  border: 1px solid rgb(210 220 231 / 92%);
  border-radius: 20px;
  background: rgb(255 255 255 / 91%);
  box-shadow: 0 22px 60px rgb(38 56 76 / 10%), 0 2px 6px rgb(38 56 76 / 4%);
  backdrop-filter: blur(12px);
}

#upload-panel {
  display: flex;
  width: min(620px, 100%);
  flex: 1;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  align-self: center;
  padding: clamp(28px, 6vw, 64px);
  text-align: center;
  animation: panel-enter 420ms ease-out both;
}

.upload-icon {
  display: grid;
  width: 68px;
  height: 68px;
  margin-bottom: 22px;
  place-items: center;
  border: 1px solid #d4e5e5;
  border-radius: 22px;
  color: #276373;
  background: linear-gradient(145deg, #f0f8f7, #e2f0ee);
  font-size: 2rem;
  font-weight: 400;
  box-shadow: 0 10px 24px rgb(39 99 115 / 10%);
}

#upload-panel h2 {
  max-width: 440px;
  margin: 0;
  font-size: clamp(1.6rem, 4vw, 2.25rem);
  letter-spacing: -0.045em;
  line-height: 1.15;
}

#upload-panel p {
  max-width: 410px;
  margin: 14px 0 24px;
  color: #68788c;
  line-height: 1.6;
}

input[type="file"] {
  max-width: 100%;
  margin-top: 12px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  clip-path: inset(50%);
}

.file-picker {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 8px 14px;
  border: 1px solid #cbd7df;
  border-radius: 10px;
  color: #35485a;
  background: #fff;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: background 150ms ease, border-color 150ms ease, transform 150ms ease;
}

.file-picker:hover,
button:hover:not(:disabled) {
  border-color: #8ba8b0;
  background: #f3f8f8;
}

.upload-picker {
  min-height: 48px;
  padding: 12px 22px;
  border-color: #285f6b;
  color: #fff;
  background: #285f6b;
  box-shadow: 0 7px 16px rgb(40 95 107 / 18%);
}

.upload-picker:hover {
  border-color: #1e4c57;
  color: #fff;
  background: #1e4c57;
  transform: translateY(-1px);
}

#reader-panel {
  display: flex;
  min-height: 0;
  flex: 1;
  flex-direction: column;
  overflow: hidden;
  padding: 8px;
  animation: panel-enter 320ms ease-out both;
}

.reader-toolbar {
  display: flex;
  min-height: 44px;
  flex: 0 0 auto;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 0 2px 8px;
}

.reader-toolbar .brand {
  flex: 0 0 auto;
  gap: 8px;
}

.navigation-controls,
.reader-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

button {
  min-height: 36px;
  padding: 6px 10px;
  border: 1px solid #ced9e1;
  border-radius: 10px;
  color: #31475a;
  background: linear-gradient(180deg, #fff, #f6f8fa);
  box-shadow: 0 1px 2px rgb(25 38 55 / 6%), inset 0 1px 0 rgb(255 255 255 / 90%);
  font: inherit;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition:
    background 150ms ease,
    border-color 150ms ease,
    color 150ms ease,
    box-shadow 150ms ease,
    transform 150ms ease;
}

button:hover:not(:disabled) {
  border-color: #9bb4bb;
  background: linear-gradient(180deg, #fff, #edf5f5);
  box-shadow: 0 3px 9px rgb(35 75 89 / 10%), inset 0 1px 0 #fff;
  transform: translateY(-1px);
}

button:active:not(:disabled) {
  box-shadow: inset 0 2px 4px rgb(25 38 55 / 10%);
  transform: translateY(0);
}

button:focus-visible,
.file-picker:focus-within,
.brand:focus-visible {
  outline: 3px solid rgb(53 126 137 / 35%);
  outline-offset: 2px;
}

.icon-button {
  width: 36px;
  padding: 0;
  font-size: 1.15rem;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.42;
  box-shadow: none;
}

.toolbar-button[aria-pressed="true"] {
  border-color: #2f7375;
  color: #fff;
  background: linear-gradient(145deg, #438c89, #28666c);
  box-shadow: 0 3px 10px rgb(40 102 108 / 22%), inset 0 1px 0 rgb(255 255 255 / 20%);
}

.toolbar-button[aria-pressed="true"]:hover:not(:disabled) {
  border-color: #245b61;
  color: #fff;
  background: linear-gradient(145deg, #397c7b, #205860);
  box-shadow: 0 5px 13px rgb(40 102 108 / 28%), inset 0 1px 0 rgb(255 255 255 / 20%);
}

.fullscreen-button {
  border-color: #d3e1e2;
}

.compact-picker {
  min-height: 36px;
  font-size: 0.8rem;
}

.page-status {
  min-width: 126px;
  color: #607186;
  text-align: center;
  font-variant-numeric: tabular-nums;
  font-size: 0.85rem;
}

.canvas-wrap {
  display: flex;
  min-height: 0;
  flex: 1;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 5px;
  border: 1px solid #dce3ea;
  border-radius: 13px;
  background:
    radial-gradient(ellipse at center, rgb(255 255 255 / 78%), transparent 75%),
    linear-gradient(145deg, #e7edf1, #e1e8ed);
  box-shadow: inset 0 1px 3px rgb(44 63 80 / 5%);
}

.pages-container {
  display: flex;
  width: 100%;
  height: 100%;
  align-items: center;
  justify-content: center;
  gap: clamp(6px, 1vw, 14px);
}

.page-frame {
  position: relative;
  display: flex;
  min-width: 0;
  min-height: 0;
  flex: 0 1 auto;
  align-items: center;
  justify-content: center;
}

.page-canvas {
  display: block;
  max-width: 100%;
  max-height: 100%;
  background: #fff;
  box-shadow: 0 16px 34px rgb(33 47 63 / 18%), 0 1px 4px rgb(33 47 63 / 12%);
}

.bookmark-ribbon {
  position: absolute;
  top: 0;
  right: clamp(12px, 2vw, 24px);
  z-index: 1;
  display: flex;
  width: 42px;
  height: 78px;
  flex-direction: column;
  align-items: center;
  padding: 10px 0 16px;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 50% 78%, 0 100%);
  color: #fffaf0;
  background: linear-gradient(160deg, #d99a3b, #a96117);
  filter: drop-shadow(0 4px 5px rgb(95 62 21 / 22%));
  pointer-events: none;
}

.bookmark-ribbon > span:first-child {
  font-size: 0.9rem;
  line-height: 1;
}

.ribbon-label {
  margin-top: 7px;
  font-size: 0.55rem;
  font-weight: 750;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  writing-mode: vertical-rl;
}

#message {
  position: fixed;
  right: 20px;
  bottom: 14px;
  z-index: 2;
  max-width: min(440px, calc(100% - 40px));
  margin: 0;
  padding: 8px 13px;
  border: 1px solid #d7e0e7;
  border-radius: 10px;
  color: #526579;
  background: #fff;
  box-shadow: 0 6px 20px rgb(33 47 63 / 10%);
  text-align: center;
  font-size: 0.82rem;
}

#message:empty {
  display: none;
}

#message[data-error="true"] {
  border-color: #f0caca;
  color: #a12c2c;
  background: #fff8f8;
}

[hidden] {
  display: none !important;
}

html:fullscreen,
html:fullscreen body {
  width: 100%;
  height: 100%;
  background: #edf2f7;
}

html:fullscreen main {
  width: 100%;
  max-width: none;
  height: 100%;
}

@keyframes panel-enter {
  from {
    opacity: 0;
    transform: translateY(8px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 560px) {
  main {
    gap: 0;
    padding: 6px;
  }

  #reader-panel {
    padding: 10px;
  }

  .reader-toolbar {
    justify-content: center;
    gap: 6px;
    padding-bottom: 6px;
  }

  .reader-toolbar .brand {
    width: 100%;
    justify-content: center;
  }

  .reader-actions {
    justify-content: center;
  }

  .reader-actions button,
  .reader-actions .file-picker {
    min-height: 32px;
    padding: 5px 7px;
    font-size: 0.7rem;
  }

  .reader-actions .visually-hidden {
    position: absolute;
  }

  .canvas-wrap {
    padding: 3px;
  }

  .pages-container {
    gap: 5px;
  }

  .bookmark-ribbon {
    right: 8px;
    width: 32px;
    height: 62px;
    padding-top: 7px;
  }

  .ribbon-label {
    margin-top: 5px;
    font-size: 0.48rem;
  }

  .page-status {
    min-width: 110px;
    font-size: 0.78rem;
  }
}

@media (max-height: 560px) {
  main {
    gap: 0;
    padding-top: 4px;
    padding-bottom: 4px;
  }

  .brand-mark {
    width: 30px;
    height: 30px;
    border-radius: 8px;
  }

  #reader-panel {
    padding: 5px;
  }

  .reader-toolbar {
    min-height: 34px;
    padding-bottom: 4px;
  }

  .reader-toolbar button,
  .compact-picker {
    min-height: 30px;
  }

  .canvas-wrap {
    padding: 4px;
  }
}

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