:root {
  --bg: #f6f1e7;
  --paper: #fffdf8;
  --text: #1f1c18;
  --muted: #6f665b;
  --line: #e7dccd;
  --accent: #8b2e1e;
  --shadow: 0 18px 50px rgba(34, 23, 10, 0.12);
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  background:
  radial-gradient(circle at top, rgba(139, 46, 30, 0.08), transparent 28rem),
  linear-gradient(180deg, #f5efe5 0%, var(--bg) 100%);
  color: var(--text);
  font-family: "Source Serif 4", Georgia, Cambria, "Times New Roman", Times, serif;
  line-height: 1.65;
}
.page {
  width: min(860px, calc(100vw - 32px));
  margin: 32px auto 72px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 40px 24px 56px;
}
.toc {
  position: fixed;
  top: 24px;
  left: max(16px, calc(50vw - 760px));
  width: 260px;
  max-height: calc(100vh - 48px);
  overflow: auto;
  padding: 18px 16px;
  background: rgba(255, 253, 248, 0.94);
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: 0 12px 34px rgba(34, 23, 10, 0.10);
  backdrop-filter: blur(10px);
}
.toc h2 {
  margin: 0 0 0.85rem;
  font-size: 0.92rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}
.toc ol {
  margin: 0;
  padding: 0;
  list-style: none;
}
.toc li + li {
  margin-top: 0.5rem;
}
.toc a {
  display: block;
  color: var(--text);
  text-decoration: none;
  font-family: "Source Sans 3", "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 0.95rem;
  line-height: 1.35;
}
.toc a.sub {
  padding-left: 14px;
  color: var(--muted);
  font-size: 0.88rem;
}
.toc a:hover {
  color: var(--accent);
}
h1, h2, h3, h4, h5, h6 {
  color: #181512;
  line-height: 1.15;
  margin: 2rem 0 0.8rem;
  font-family: "Source Sans 3", "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-weight: 700;
}
h1 {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  margin-top: 0;
  margin-bottom: 0.8rem;
  letter-spacing: -0.02em;
}
.signature {
  display: inline-flex;
  align-items: center;
  gap: 0.85rem;
  margin: 0 0 2rem;
  text-decoration: none;
  color: var(--muted);
  font-family: "Source Sans 3", "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 0.98rem;
  line-height: 1.2;
}
.signature:hover {
  color: var(--accent);
}
.signature-logo {
  width: 42px;
  height: 42px;
  border-radius: 999px;
  object-fit: cover;
  flex: 0 0 auto;
  box-shadow: 0 6px 18px rgba(34, 23, 10, 0.14);
}
.signature-text {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}
.signature-name {
  color: #181512;
  font-weight: 600;
}
.signature-date {
  color: var(--muted);
  font-size: 0.9rem;
}
h2, h3, h4, h5, h6 {
  font-size: clamp(1.35rem, 2.8vw, 2rem);
}
p, li, figcaption, blockquote {
  font-size: 1.14rem;
}
p {
  margin: 1rem 0;
}
a {
  color: var(--accent);
  overflow-wrap: anywhere;
}
figure {
  margin: 2rem 0;
}
img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 12px;
  cursor: zoom-in;
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.10);
}
figcaption {
  margin-top: 0.65rem;
  color: var(--muted);
  text-align: center;
  font-family: "Source Sans 3", "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 0.95rem;
}
blockquote {
  margin: 1.5rem 0;
  padding: 0.4rem 0 0.4rem 1rem;
  border-left: 4px solid #d8c4a7;
  color: #493f35;
}
.embed-wrap {
  margin: 2rem 0;
  aspect-ratio: 16 / 9;
  border-radius: 14px;
  overflow: hidden;
  background: #000;
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.12);
}
.embed-wrap iframe {
  width: 100%;
  height: 100%;
  border: 0;
}
.page-footer {
  margin-top: 3rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-family: "Source Sans 3", "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 0.9rem;
  line-height: 1.45;
}
.page-footer p {
  margin: 0.4rem 0;
}
.lightbox {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  background: rgba(12, 9, 6, 0.86);
  padding: 24px;
  z-index: 9999;
}
.lightbox.open {
  display: flex;
}
.lightbox img {
  max-width: min(96vw, 1600px);
  max-height: 92vh;
  width: auto;
  border-radius: 12px;
  cursor: zoom-out;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.4);
}
.lightbox button {
  position: absolute;
  top: 18px;
  right: 18px;
  border: 0;
  background: rgba(255, 255, 255, 0.14);
  color: white;
  width: 44px;
  height: 44px;
  border-radius: 999px;
  font-size: 28px;
  line-height: 1;
  cursor: pointer;
}
@media (max-width: 640px) {
  .page {
    width: min(100vw - 16px, 860px);
    margin: 8px auto 32px;
    padding: 22px 14px 34px;
    border-radius: 12px;
  }
  p, li, figcaption, blockquote {
    font-size: 1.03rem;
  }
}
@media (min-width: 1280px) {
  .page {
    margin-left: max(320px, calc(50vw - 430px));
    margin-right: auto;
  }
}
@media (max-width: 1279px) {
  .toc {
    display: none;
  }
}
.page-nav {
  margin: 2.5rem 0 1.5rem;
  padding: 1rem 1.25rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(139, 46, 30, 0.05);
  font-family: "Source Sans 3", "Helvetica Neue", Arial, sans-serif;
  font-weight: 600;
}
.page-nav-back {
  margin-top: 0.5rem;
}
.page-nav a {
  text-decoration: none;
}
.back-link {
  margin: 1.25rem 0 0;
  font-family: "Source Sans 3", "Helvetica Neue", Arial, sans-serif;
  font-size: 0.9rem;
}
.back-link a {
  color: var(--muted);
}
.toc li.toc-other {
  margin-top: 0.9rem;
  padding-top: 0.6rem;
  border-top: 1px solid var(--line);
  font-weight: 600;
}