:root {
  --ink: #171611;
  --paper: #f2efe8;
  --lime: #d8ff43;
  --line: rgba(23, 22, 17, 0.2);
  --reader-line: rgba(242, 239, 232, 0.18);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Inter, "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  text-rendering: optimizeLegibility;
}

button,
input {
  font: inherit;
}

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

a {
  color: inherit;
  text-decoration: none;
}

.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;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 76px;
  padding: 0 4vw;
  border-bottom: 1px solid var(--line);
  background: rgba(242, 239, 232, 0.88);
  backdrop-filter: blur(18px);
}

.brand,
.actions {
  display: flex;
  align-items: center;
}

.brand {
  gap: 12px;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.16em;
}

.brand-mark {
  width: 18px;
  height: 18px;
  background: var(--ink);
  border-radius: 50% 50% 8% 50%;
  transform: rotate(45deg);
}

.actions {
  gap: 24px;
  font-size: 0.86rem;
  font-weight: 700;
}

.text-link {
  border-bottom: 1px solid currentColor;
  padding-bottom: 3px;
}

.download-button {
  padding: 12px 18px;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--paper);
  transition: background 160ms ease, color 160ms ease;
}

.download-button:hover,
.download-button:focus-visible {
  background: var(--lime);
  color: var(--ink);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(140px, 0.22fr);
  min-height: 68vh;
  padding: clamp(72px, 10vw, 150px) 4vw 70px;
  border-bottom: 1px solid var(--line);
}

.hero-copy {
  max-width: 1050px;
}

.eyebrow {
  margin: 0 0 24px;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.2em;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 34px;
  font-size: clamp(4.2rem, 10vw, 10.5rem);
  font-weight: 800;
  letter-spacing: -0.075em;
  line-height: 0.83;
}

h1 span {
  display: block;
  color: transparent;
  -webkit-text-stroke: 1.8px var(--ink);
}

.intro {
  max-width: 610px;
  margin-bottom: 0;
  font-size: clamp(1rem, 1.5vw, 1.25rem);
  line-height: 1.8;
}

.hero-index {
  display: grid;
  grid-template-rows: auto 1fr auto;
  align-items: center;
  justify-items: center;
  gap: 18px;
  padding-top: 18px;
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.14em;
}

.hero-index div {
  width: 1px;
  height: 100%;
  background: var(--ink);
}

.hero-index span:last-child {
  writing-mode: vertical-rl;
}

.viewer-section {
  padding: clamp(64px, 8vw, 112px) 4vw;
  background: var(--ink);
  color: var(--paper);
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 32px;
  margin-bottom: 32px;
}

.section-heading .eyebrow {
  color: var(--lime);
}

.section-heading h2 {
  margin-bottom: 0;
  font-size: clamp(2.5rem, 5vw, 5rem);
  letter-spacing: -0.055em;
  line-height: 1;
}

.section-heading > p {
  max-width: 340px;
  margin-bottom: 4px;
  color: rgba(242, 239, 232, 0.62);
  font-size: 0.84rem;
  line-height: 1.6;
  text-align: right;
}

.reader {
  border: 1px solid var(--reader-line);
  background: #25241f;
  box-shadow: 0 28px 80px rgba(0, 0, 0, 0.28);
  outline: none;
}

.reader-toolbar {
  position: sticky;
  top: 76px;
  z-index: 15;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 66px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--reader-line);
  background: rgba(28, 27, 23, 0.94);
  backdrop-filter: blur(18px);
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.reader-button,
.reader-mobile-nav button {
  min-height: 42px;
  border: 1px solid rgba(242, 239, 232, 0.28);
  border-radius: 0;
  background: transparent;
  color: var(--paper);
  font-size: 0.78rem;
  font-weight: 750;
  cursor: pointer;
  transition: border-color 150ms ease, background 150ms ease, color 150ms ease;
}

.reader-button {
  padding: 0 14px;
}

.mode-controls {
  padding: 3px;
  border: 1px solid rgba(242, 239, 232, 0.18);
  background: rgba(17, 17, 15, 0.52);
}

.mode-button {
  min-width: 86px;
  min-height: 36px;
  border-color: transparent;
}

.mode-button.is-active {
  border-color: var(--lime);
  background: var(--lime);
  color: var(--ink);
}

.reader-button:hover:not(:disabled),
.reader-button:focus-visible,
.reader-mobile-nav button:hover:not(:disabled),
.reader-mobile-nav button:focus-visible {
  border-color: var(--lime);
  background: var(--lime);
  color: var(--ink);
  outline: none;
}

.reader-button:disabled,
.reader-mobile-nav button:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.icon-button {
  width: 42px;
  padding: 0;
  font-size: 1.2rem;
}

.fullscreen-button {
  border-color: var(--lime);
  color: var(--lime);
}

.page-jump {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  min-width: 104px;
  height: 42px;
  color: rgba(242, 239, 232, 0.7);
  font-size: 0.78rem;
}

.page-jump input {
  width: 48px;
  height: 34px;
  border: 1px solid rgba(242, 239, 232, 0.3);
  border-radius: 0;
  background: #11110f;
  color: var(--paper);
  text-align: center;
  appearance: textfield;
}

.page-jump input::-webkit-inner-spin-button,
.page-jump input::-webkit-outer-spin-button {
  appearance: none;
  margin: 0;
}

.page-jump input:focus {
  border-color: var(--lime);
  outline: 2px solid rgba(216, 255, 67, 0.2);
}

.zoom-value {
  min-width: 74px;
  color: rgba(242, 239, 232, 0.72);
  font-size: 0.72rem;
  font-variant-numeric: tabular-nums;
  text-align: center;
}

.reader-stage {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: clamp(590px, 78vh, 920px);
  padding: 24px;
  overflow: auto;
  overscroll-behavior: contain;
  background-color: #33322d;
  background-image: radial-gradient(rgba(242, 239, 232, 0.1) 0.7px, transparent 0.7px);
  background-size: 9px 9px;
  touch-action: pan-y pinch-zoom;
}

#pdf-canvas {
  display: block;
  flex: 0 0 auto;
  background: #ffffff;
  box-shadow: 0 18px 55px rgba(0, 0, 0, 0.42);
}

#pdf-canvas[hidden] {
  display: none;
}

.pdf-scroll-view {
  width: 100%;
}

.pdf-scroll-view[hidden],
.scroll-page-canvas[hidden],
.scroll-page-placeholder[hidden] {
  display: none;
}

.reader[data-mode="scroll"] .reader-stage {
  display: block;
  padding: 0;
  overflow-x: hidden;
  overflow-y: auto;
  scroll-snap-type: y mandatory;
  scroll-behavior: smooth;
  touch-action: pan-y;
}

.scroll-page {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: var(--scroll-slot-height, 680px);
  padding: 24px;
  scroll-snap-align: start;
  scroll-snap-stop: always;
}

.scroll-page + .scroll-page {
  border-top: 1px solid rgba(242, 239, 232, 0.12);
}

.scroll-page-canvas {
  display: block;
  flex: 0 0 auto;
  background: #ffffff;
  box-shadow: 0 18px 55px rgba(0, 0, 0, 0.42);
}

.scroll-page-placeholder {
  position: absolute;
  display: grid;
  place-items: center;
  width: min(76%, 520px);
  aspect-ratio: 16 / 10;
  border: 1px solid rgba(242, 239, 232, 0.14);
  color: rgba(242, 239, 232, 0.42);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  background: rgba(17, 17, 15, 0.32);
}

.reader-loading,
.reader-error {
  position: absolute;
  inset: 0;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 28px;
  text-align: center;
  background: #292823;
}

.reader-loading[hidden],
.reader-error[hidden] {
  display: none;
}

.loading-kicker {
  margin-bottom: 18px;
  color: var(--lime);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.2em;
}

.reader-loading strong,
.reader-error strong {
  font-size: clamp(1.1rem, 2vw, 1.5rem);
}

.loading-track {
  width: min(340px, 72vw);
  height: 3px;
  margin-top: 22px;
  overflow: hidden;
  background: rgba(242, 239, 232, 0.16);
}

.loading-track span {
  display: block;
  width: 4%;
  height: 100%;
  background: var(--lime);
  transition: width 180ms ease;
}

.reader-error p {
  margin: 12px 0 22px;
  color: rgba(242, 239, 232, 0.65);
}

.reader-error a,
.noscript-message a {
  color: var(--lime);
  text-decoration: underline;
  text-underline-offset: 5px;
}

.reader-mobile-nav {
  display: none;
}

.swipe-hint,
.noscript-message {
  margin: 0;
  padding: 13px 16px;
  border-top: 1px solid var(--reader-line);
  color: rgba(242, 239, 232, 0.48);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  text-align: center;
}

.reader:fullscreen {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  width: 100vw;
  height: 100vh;
  border: 0;
  background: #25241f;
}

.reader:fullscreen .reader-toolbar {
  position: static;
}

.reader:fullscreen .reader-stage {
  height: auto;
  min-height: 0;
}

footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 28px;
  min-height: 160px;
  padding: 36px 4vw;
  border-top: 1px solid rgba(242, 239, 232, 0.15);
  background: var(--ink);
  color: var(--paper);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.16em;
}

footer p {
  margin-bottom: 0;
}

footer a {
  color: var(--lime);
}

@media (max-width: 900px) {
  .fit-button,
  .zoom-value {
    display: none;
  }

  .reader-toolbar {
    gap: 10px;
  }
}

@media (max-width: 720px) {
  .topbar {
    min-height: 66px;
    padding-inline: 20px;
  }

  .text-link {
    display: none;
  }

  .download-button {
    padding: 10px 13px;
  }

  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding: 72px 20px 56px;
  }

  h1 {
    font-size: clamp(3.5rem, 21vw, 6rem);
  }

  .hero-index {
    display: none;
  }

  .viewer-section {
    padding: 60px 0 0;
  }

  .section-heading {
    display: block;
    padding-inline: 20px;
  }

  .section-heading > p {
    margin-top: 16px;
    text-align: left;
  }

  .reader {
    border-right: 0;
    border-left: 0;
  }

  .reader-toolbar {
    top: 66px;
    justify-content: center;
    min-height: 58px;
    padding: 8px 10px;
  }

  .mode-controls {
    order: 3;
  }

  .mode-button {
    min-width: 76px;
    min-height: 36px;
    padding-inline: 9px;
    font-size: 0.72rem;
  }

  .reader-toolbar .reader-button-wide,
  .view-controls .icon-button,
  .view-controls .fit-button,
  .view-controls .zoom-value {
    display: none;
  }

  .page-jump {
    min-width: 116px;
  }

  .fullscreen-button {
    min-height: 38px;
    padding-inline: 12px;
  }

  .reader-stage {
    align-items: flex-start;
    height: min(68svh, 760px);
    min-height: 460px;
    padding: 14px;
  }

  .scroll-page {
    padding: 14px;
  }

  .reader-mobile-nav {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    gap: 10px;
    padding: 10px;
    border-top: 1px solid var(--reader-line);
    background: #1c1b17;
  }

  .reader-mobile-nav button {
    min-height: 48px;
    padding: 0 12px;
  }

  .reader-mobile-nav button:last-child {
    justify-self: stretch;
  }

  .reader-mobile-nav span {
    min-width: 86px;
    font-size: 0.75rem;
    font-variant-numeric: tabular-nums;
    text-align: center;
  }

  .swipe-hint {
    padding-bottom: calc(13px + env(safe-area-inset-bottom));
  }

  .reader:fullscreen .reader-toolbar {
    top: 0;
  }

  footer {
    min-height: 130px;
    padding-inline: 20px;
    letter-spacing: 0.1em;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .reader-button,
  .reader-mobile-nav button,
  .loading-track span {
    transition: none;
  }
}