:root {
  --ink: #251f1a;
  --ink-soft: #4b3f34;
  --paper: #f5efe6;
  --paper-deep: #e9ddcc;
  --accent: #b6522f;
  --accent-deep: #7a2e1a;
  --nav-bg: #efe4d6;
  --highlight: #f3c98b;
  --shadow: rgba(45, 34, 26, 0.18);
}

* {
  box-sizing: border-box;
}

html {
  max-width: 100%;
}

body {
  margin: 0;
  max-width: 100%;
  color: var(--ink);
  background:
    radial-gradient(
      circle at 20% 20%,
      rgba(255, 255, 255, 0.55),
      transparent 45%
    ),
    radial-gradient(
      circle at 80% 0%,
      rgba(236, 196, 140, 0.35),
      transparent 50%
    ),
    linear-gradient(135deg, #fbf7f2 0%, #efe0cb 50%, #f8f1e7 100%);
  font-family: "Avenir Next", "Gill Sans", "Trebuchet MS", sans-serif;
  line-height: 1.6;
}

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

.hero {
  padding: clamp(24px, 6vw, 48px) clamp(16px, 6vw, 6vw) clamp(16px, 4vw, 32px);
  background:
    linear-gradient(120deg, rgba(182, 82, 47, 0.12), transparent 55%),
    linear-gradient(220deg, rgba(122, 46, 26, 0.18), transparent 45%);
  border-bottom: 1px solid rgba(63, 44, 31, 0.2);
  animation: fade-up 0.8s ease both;
}

.hero h1 {
  font-family:
    "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Garamond, serif;
  font-size: clamp(1.5rem, 6vw, 3.6rem);
  letter-spacing: 0.02em;
  margin: 0 0 8px;
}

.hero p {
  margin: 0;
  max-width: 54ch;
  color: var(--ink-soft);
  font-size: 1.05rem;
}

.layout {
  display: grid;
  grid-template-columns: minmax(200px, 280px) minmax(0, 1fr);
  gap: clamp(16px, 4vw, 28px);
  padding: clamp(16px, 4vw, 32px) clamp(12px, 6vw, 6vw) clamp(32px, 8vw, 64px);
}

.toc {
  background: var(--nav-bg);
  border-radius: 18px;
  padding: clamp(16px, 4vw, 24px);
  box-shadow: 0 18px 40px var(--shadow);
  position: sticky;
  top: 24px;
  max-height: calc(100vh - 48px);
  overflow: auto;
  animation: fade-up 0.8s ease 0.1s both;
}

.toc h2 {
  margin-top: 0;
  font-size: 1.1rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-deep);
}

.toc input {
  width: 100%;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid rgba(70, 50, 36, 0.2);
  font-size: 0.95rem;
  margin-bottom: 14px;
  background: #fffaf3;
}

.toc-letters {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(28px, 1fr));
  gap: 6px;
  margin-bottom: 16px;
}

.toc-letters a {
  font-size: 0.75rem;
  text-decoration: none;
  text-align: center;
  color: var(--accent-deep);
  padding: 4px 6px;
  border-radius: 6px;
  background: rgba(182, 82, 47, 0.12);
}

.toc-letters a:hover {
  background: rgba(182, 82, 47, 0.25);
}

.toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 6px;
}

.toc-list a {
  text-decoration: none;
  color: var(--ink);
  padding: 6px 8px;
  border-radius: 10px;
  display: block;
  transition:
    background 0.2s ease,
    color 0.2s ease;
}

.toc-list a:hover,
.toc-list a:focus {
  background: rgba(182, 82, 47, 0.15);
  color: var(--accent-deep);
}

.toc-list a.active {
  background: rgba(182, 82, 47, 0.22);
  color: var(--accent-deep);
  font-weight: 600;
}

.content {
  background: rgba(255, 255, 255, 0.6);
  border-radius: clamp(12px, 3vw, 24px);
  padding: clamp(16px, 4vw, 32px) clamp(16px, 5vw, 36px);
  box-shadow: 0 20px 55px var(--shadow);
  animation: fade-up 0.8s ease 0.2s both;
  overflow-wrap: break-word;
  word-wrap: break-word;
  min-width: 0;
}

.content h2,
.content h3 {
  font-family:
    "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Garamond, serif;
  letter-spacing: 0.02em;
  color: var(--accent-deep);
}

.entry-title {
  font-weight: 700;
  color: var(--accent-deep);
  letter-spacing: 0.04em;
  animation: fade-up 0.6s ease both;
  animation-delay: var(--entry-delay, 0s);
  scroll-margin-top: 1rem;
}

.entry-title:target {
  background: var(--highlight);
  padding: 2px 6px;
  border-radius: 6px;
}

.entry-link {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px dashed rgba(122, 46, 26, 0.4);
}

.entry-link:hover {
  color: var(--accent-deep);
  border-bottom-style: solid;
}

.note {
  font-style: italic;
  color: var(--ink-soft);
}

@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Collapse/expand toggle */
.toc-toggle {
  position: fixed;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  z-index: 100;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 0 8px 8px 0;
  padding: 12px 8px;
  cursor: pointer;
  font-size: 1.2rem;
  box-shadow: 2px 2px 8px var(--shadow);
  transition:
    background 0.2s ease,
    left 0.3s ease;
}

.toc-toggle:hover {
  background: var(--accent-deep);
}

.toc-toggle::before {
  content: "◀";
  display: block;
}

.toc.collapsed + .content ~ .toc-toggle::before,
body.toc-collapsed .toc-toggle::before {
  content: "▶";
}

.toc {
  transition:
    margin-left 0.3s ease,
    opacity 0.3s ease,
    width 0.3s ease;
}

.toc.collapsed {
  margin-left: -340px;
  opacity: 0;
  pointer-events: none;
}

.layout {
  transition: grid-template-columns 0.3s ease;
}

.layout.toc-hidden {
  grid-template-columns: 0 minmax(0, 1fr);
}

/* Entry popup preview */
.entry-popup {
  position: fixed;
  z-index: 300;
  max-width: min(420px, 90vw);
  max-height: min(320px, 60vh);
  overflow-y: auto;
  background: var(--paper);
  border-radius: 12px;
  padding: 16px 20px;
  box-shadow:
    0 8px 32px var(--shadow),
    0 2px 8px rgba(45, 34, 26, 0.1);
  border: 1px solid rgba(70, 50, 36, 0.15);
  font-size: 0.95rem;
  line-height: 1.55;
  opacity: 0;
  transform: translateY(4px);
  transition:
    opacity 0.2s ease,
    transform 0.2s ease;
  pointer-events: none;
}

.entry-popup.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.entry-popup .entry-title {
  animation: none;
}

.entry-popup p {
  margin: 0 0 0.75em;
}

.entry-popup p:last-child {
  margin-bottom: 0;
}

.entry-popup .entry-link {
  pointer-events: auto;
}

@media (max-width: 700px) {
  .page,
  .hero,
  .content {
    max-width: 100%;
  }

  .toc {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: min(85vw, 320px);
    max-height: 100vh;
    border-radius: 0 18px 18px 0;
    z-index: 200;
    margin-left: 0;
    transform: translateX(-100%);
    transition: transform 0.3s ease, opacity 0.3s ease;
    animation: none;
  }

  body.toc-open .toc {
    transform: translateX(0);
    opacity: 1;
    pointer-events: auto;
  }

  .toc-toggle {
    top: 50%;
    bottom: auto;
    transform: translateY(-50%);
    z-index: 201;
    transition: left 0.3s ease;
    padding: 10px 6px;
    font-size: 1rem;
    left: 0;
  }

  body.toc-open .toc-toggle {
    left: min(85vw, 320px);
  }

  .toc-toggle::before {
    content: "▶";
  }

  body.toc-open .toc-toggle::before {
    content: "◀";
  }

  .layout,
  .layout.toc-hidden {
    display: block;
    grid-template-columns: none;
    max-width: 100%;
  }

  .content {
    border-radius: clamp(8px, 2vw, 16px);
  }
}