:root {
  --bg: #252525;
  --panel: #2d2d2d;
  --panel-edge: #111;
  --text: #f2f2f2;
  --muted: #bbbbbb;
  --link: #e4d38a;
  --link-hover: #fff2b0;
  --accent: #6fa14d;
  --shadow: rgba(0, 0, 0, 0.45);
  --manual-sidebar-offset: 20px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: #1f1f1f url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23272727' d='M0 0h12v12H0z'/%3E%3Cpath fill='%23222222' d='M0 0h6v6H0zM6 6h6v6H6z'/%3E%3C/svg%3E");
  color: var(--text);
  font: 16px/1.45 "Helvetica Neue", Helvetica, Arial, sans-serif;
}

a {
  color: var(--link);
  text-decoration: none;
}

a:hover {
  color: var(--link-hover);
  text-decoration: underline;
}

.outer {
  width: 100%;
}

.inner {
  width: min(1260px, calc(100vw - 32px));
  margin: 0 auto;
}

#header_wrap {
  background: linear-gradient(#3d3d3d, #252525);
  border-bottom: 1px solid #111;
  box-shadow: inset 0 -1px 0 rgba(255, 255, 255, 0.05);
}

#header_wrap .inner {
  padding: 18px 0 26px;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  margin-bottom: 28px;
  font-size: 15px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.site-nav a {
  color: #f0f0f0;
}

.site-nav a[aria-current="page"] {
  color: #ffffff;
  text-decoration: none;
  text-shadow: 0 0 12px rgba(228, 211, 138, 0.35);
}

.site-nav a[aria-current="page"]::before {
  content: ">";
  margin-right: 6px;
  color: var(--accent);
}

#project_title {
  margin: 0;
  font-size: clamp(38px, 7vw, 62px);
  line-height: 1;
  letter-spacing: 0.04em;
  color: #ffffff;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.6);
}

#project_tagline {
  margin: 4px 0 0;
  font-size: 20px;
  font-weight: 400;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #d2d2d2;
}

#project_credit {
  margin: 8px 0 0;
  font-size: 13px;
  letter-spacing: 0.03em;
  color: #b8c4cc;
}

#main_content_wrap {
  background: transparent;
}

#main_content {
  padding: 34px 0 42px;
}

.manual-layout {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 28px;
  align-items: start;
}

.manual-sidebar {
  align-self: start;
}

.manual-sidebar-panel {
  position: fixed;
  top: var(--manual-sidebar-offset);
  left: max(16px, calc((100vw - min(1260px, calc(100vw - 32px))) / 2));
  width: 280px;
  max-height: calc(100vh - var(--manual-sidebar-offset) - 20px);
  overflow: auto;
  padding: 16px 16px 18px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid #3a3a3a;
  border-radius: 10px;
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.25);
}

.manual-sidebar-title {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.manual-sidebar-nav ul {
  margin: 0;
  padding-left: 16px;
}

.manual-sidebar-nav > ul {
  padding-left: 0;
  list-style: none;
}

.manual-sidebar-nav li {
  margin-top: 4px;
  list-style: none;
}

.manual-sidebar-nav a {
  display: inline-block;
  padding: 2px 0;
  color: #ddd7bf;
  font-size: 14px;
  line-height: 1.35;
}

.manual-sidebar-nav a.is-active {
  color: #ffffff;
  text-decoration: none;
  text-shadow: 0 0 12px rgba(228, 211, 138, 0.35);
}

.manual-sidebar-nav a.is-active::before {
  content: ">";
  margin-right: 6px;
  color: var(--accent);
}

.manual-body {
  min-width: 0;
}

section {
  margin: 0 0 28px;
}

h3 {
  margin: 0 0 12px;
  font-size: 28px;
  color: #ffffff;
  border-bottom: 1px solid #3f3f3f;
  padding-bottom: 8px;
}

p,
li {
  color: var(--text);
}

p {
  margin: 0 0 16px;
}

ul {
  margin: 0;
  padding-left: 22px;
}

li + li {
  margin-top: 6px;
}

strong {
  color: #ffffff;
}

#footer_wrap {
  border-top: 1px solid #101010;
  background: #171717;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

#footer_wrap .inner {
  padding: 22px 0 34px;
}

.copyright {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.embed-frame {
  margin: 20px 0 0;
  padding: 14px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid #3a3a3a;
  border-radius: 8px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
}

.notice {
  margin: 18px 0 0;
  padding: 14px 16px;
  background: rgba(255, 255, 255, 0.04);
  border-left: 4px solid var(--accent);
  border-radius: 8px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.notice.warning {
  border-left-color: #d6a44d;
  background: rgba(214, 164, 77, 0.08);
}

.notice p:last-child,
.simulator-shell p:last-child {
  margin-bottom: 0;
}

.simulator-shell {
  margin-top: 18px;
  min-height: 280px;
  padding: 20px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.02));
  border: 1px solid #3a3a3a;
  border-radius: 10px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.03), 0 10px 30px rgba(0, 0, 0, 0.22);
}

.simulator-shell h4 {
  margin: 0 0 12px;
  font-size: 18px;
  color: #ffffff;
}

.simulator-shell code {
  color: #fff2b0;
}

.simulator-frame {
  display: block;
  width: 100%;
  min-height: 820px;
  margin-top: 18px;
  border: 1px solid #3a3a3a;
  border-radius: 10px;
  background: #101112;
}

.svg-embed {
  display: block;
  width: 100%;
  min-height: 880px;
  background: #ffffff;
  border: 0;
}

@media (max-width: 720px) {
  #header_wrap .inner {
    padding: 16px 0 22px;
  }

  .site-nav {
    gap: 8px 14px;
    margin-bottom: 22px;
    font-size: 14px;
  }

  #project_tagline {
    font-size: 18px;
  }

  #project_credit {
    font-size: 12px;
    letter-spacing: 0.08em;
  }

  .manual-layout {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .manual-sidebar-panel {
    position: static;
    width: auto;
    max-height: none;
  }

  h3 {
    font-size: 24px;
  }

  .embed-frame {
    padding: 10px;
  }

  .svg-embed {
    min-height: 560px;
  }
}