:root {
  --bg: #0f1724;
  --panel: #162033;
  --panel-strong: #1f2c45;
  --panel-border: #31415e;
  --ink: #e6eefc;
  --muted: #9badc8;
  --accent: #9fc0ff;
  --accent-soft: #cfe0ff;
  --shadow: rgba(0, 0, 0, 0.36);
  --footer-bg: #0d1118;
  --footer-bg-soft: #151a22;
  --footer-border: #283142;
  --footer-ink: #e8e3db;
  --footer-muted: #adb4bf;
  --footer-accent: #9fc0ff;
  --footer-code-bg: #0a0d12;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top right, rgba(93, 126, 184, 0.18), transparent 28%),
    radial-gradient(circle at bottom left, rgba(33, 56, 95, 0.2), transparent 34%),
    linear-gradient(180deg, #0f1724 0%, var(--bg) 100%);
}

.body-shell {
  display: flex;
  min-height: 100vh;
  flex-direction: column;
}

.app-shell {
  display: grid;
  grid-template-columns: minmax(220px, 280px) 1fr;
  flex: 1 0 auto;
}

.sidebar {
  padding: 1.5rem;
  background: var(--panel);
  border-right: 1px solid var(--panel-border);
  box-shadow: 10px 0 30px var(--shadow);
}

.sidebar h1 {
  margin-top: 0;
}

.control-stack,
.slider-wrap,
.toggle-wrap {
  display: grid;
  gap: 0.5rem;
}

.slider-wrap {
  grid-auto-flow: column;
  align-items: center;
  grid-template-columns: max-content 1fr;
}

.toggle-wrap {
  grid-auto-flow: column;
  align-items: center;
  justify-content: start;
}

.toggle-wrap input[type="checkbox"] {
  inline-size: 1.1rem;
  block-size: 1.1rem;
}

button,
select,
input[type="range"] {
  font: inherit;
}

button,
select {
  border: 1px solid var(--panel-border);
  border-radius: 0.7rem;
  background: linear-gradient(180deg, #2a3a59 0%, #1a2740 100%);
  color: var(--ink);
  padding: 0.75rem 0.9rem;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.08),
    0 8px 18px rgba(0, 0, 0, 0.18);
}

select {
  background-color: #1a2740;
  color: #f5f8ff;
}

select option {
  background: #152036;
  color: #f5f8ff;
}

select option:checked,
select option:hover {
  background: #2e4268;
  color: #ffffff;
}

button {
  cursor: pointer;
  background: linear-gradient(180deg, #43628f 0%, #223552 100%);
  color: #f5f8ff;
  font-weight: 700;
}

.nav-button {
  min-inline-size: 2.35rem;
  padding: 0.1rem 0.55rem 0.18rem;
  font-size: 1.45rem;
  line-height: 1;
  align-self: center;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-block-size: 2rem;
}

#toggle-fullscreen {
  min-inline-size: 2.35rem;
  padding: 0.1rem 0.5rem 0.18rem;
  align-self: center;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-block-size: 2rem;
  line-height: 1;
}

.slider-wrap input[type="range"] {
  min-inline-size: 0;
}

button:hover,
select:hover {
  border-color: var(--accent);
}

.reader {
  display: grid;
  grid-template-rows: auto 1fr;
  gap: 0.35rem;
  padding: 0.7rem;
  min-height: 0;
}

.toolbar {
  display: grid;
  grid-template-columns: auto 1fr auto auto auto;
  gap: 0.28rem;
  align-items: center;
  padding: 0.18rem 0.28rem;
  border: 1px solid var(--panel-border);
  border-radius: 0.65rem;
  background: rgba(18, 26, 42, 0.9);
  box-shadow:
    0 8px 18px var(--shadow),
    inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

#reader-canvas {
  width: 100%;
  height: calc(100vh - 4.5rem);
  touch-action: none;
  border: 1px solid var(--panel-border);
  border-radius: 0.95rem;
  background:
    linear-gradient(135deg, rgba(37, 49, 71, 0.98), rgba(18, 24, 37, 0.96)),
    repeating-linear-gradient(
      45deg,
      rgba(255, 255, 255, 0.03),
      rgba(255, 255, 255, 0.03) 16px,
      rgba(255, 255, 255, 0.08) 16px,
      rgba(255, 255, 255, 0.08) 32px
    );
  box-shadow: 0 22px 52px rgba(0, 0, 0, 0.38);
}

.reader.single-page-mode #reader-canvas {
  height: calc(100vh - 4.5rem);
}

@media (max-width: 920px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    border-right: 0;
    border-bottom: 1px solid var(--panel-border);
  }

  .toolbar {
    grid-template-columns: auto minmax(5rem, 1fr) auto auto auto;
    gap: 0.22rem;
  }

  .toolbar button,
  .toolbar select {
    padding: 0.32rem 0.45rem;
  }

  .toggle-wrap {
    font-size: 0.9rem;
    gap: 0.35rem;
  }

  #toggle-fullscreen {
    padding-inline: 0.65rem;
  }

  #reader-canvas {
    height: 66vh;
  }
}

@media (orientation: portrait) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    border-right: 0;
    border-bottom: 1px solid var(--panel-border);
    box-shadow: 0 8px 24px var(--shadow);
  }

  .reader {
    padding-top: 1rem;
  }
}

.site-footer {
  flex: 0 0 auto;
  border-top: 1px solid var(--footer-border);
  background:
    linear-gradient(180deg, rgba(21, 26, 34, 0.98), rgba(13, 17, 24, 0.98));
  color: var(--footer-ink);
  box-shadow: 0 -12px 30px rgba(0, 0, 0, 0.3);
}

.site-footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.5rem 1.5rem 2rem;
}

.site-footer h2 {
  margin: 0 0 0.75rem;
  font-size: 1rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--footer-muted);
}

.markdown-body {
  line-height: 1.55;
  overflow-wrap: anywhere;
  color: var(--footer-ink);
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
  margin: 1.1rem 0 0.5rem;
  line-height: 1.2;
}

.markdown-body p,
.markdown-body ul,
.markdown-body pre {
  margin: 0.75rem 0;
}

.markdown-body a {
  color: var(--footer-accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.16em;
}

.markdown-body a:hover {
  text-decoration: underline;
}

.markdown-body ul {
  padding-left: 1.5rem;
}

.markdown-body pre {
  padding: 0.9rem 1rem;
  overflow: auto;
  border-radius: 0.75rem;
  background: var(--footer-code-bg);
  border: 1px solid var(--footer-border);
}

.markdown-body code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.95em;
  color: #f0ede7;
}

.markdown-body pre code {
  color: inherit;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
  color: #ffffff;
}

.markdown-body hr {
  border: 0;
  border-top: 1px solid var(--footer-border);
  margin: 1.25rem 0;
}

.markdown-body blockquote {
  margin: 0.9rem 0;
  padding: 0.75rem 1rem;
  border-left: 3px solid var(--footer-border);
  background: rgba(255, 255, 255, 0.03);
  color: var(--footer-muted);
}