/* ─────────────────────────────────────────────
   Base & Reset
───────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg:           #f5f2ec;
  --ink:          #2a2520;
  --ink-faint:    #8a8278;
  --ink-ghost:    #c4bfb8;
  --accent:       #7a6e62;
  --overlay:      rgba(42, 37, 32, 0.92);
  --sidebar-w:    200px;
  --transition-speed: 600ms;
}

html, body {
  height: 100%;
  width: 100%;
  overflow: hidden;
}

body {
  background: var(--bg);
  color: var(--ink);
  font-family: 'Georgia', 'Times New Roman', serif;
  -webkit-font-smoothing: antialiased;
}

/* ─────────────────────────────────────────────
   Utility
───────────────────────────────────────────── */
.hidden {
  display: none !important;
}

/* ─────────────────────────────────────────────
   Cover Page
───────────────────────────────────────────── */
#cover {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  opacity: 1;
  transition: opacity var(--transition-speed) ease;
  z-index: 10;
}

.cover-inner {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.collection-title {
  font-size: clamp(1.6rem, 5vw, 3rem);
  font-weight: normal;
  letter-spacing: 0.12em;
  color: var(--ink);
}

.collection-subtitle {
  font-size: clamp(0.75rem, 2vw, 0.95rem);
  letter-spacing: 0.25em;
  color: var(--ink-faint);
  font-style: italic;
}

.enter-btn {
  margin-top: 2rem;
  background: none;
  border: none;
  color: var(--ink-faint);
  font-family: inherit;
  font-size: 0.8rem;
  letter-spacing: 0.35em;
  cursor: pointer;
  padding: 0.5rem 0;
  transition: color 300ms ease;
  text-transform: lowercase;
}

.enter-btn:hover {
  color: var(--ink);
}

/* ─────────────────────────────────────────────
   Reader layout (sidebar + main)
───────────────────────────────────────────── */
#reader {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: row;
}

/* ─────────────────────────────────────────────
   Sidebar
───────────────────────────────────────────── */
.sidebar {
  position: relative;
  display: flex;
  flex-direction: row;
  flex-shrink: 0;
  height: 100%;
  z-index: 3;
}

/* The sliding panel */
.sidebar-inner {
  width: var(--sidebar-w);
  height: 100%;
  overflow-y: auto;
  padding: 3rem 1.4rem 3rem 1.8rem;
  border-right: 1px solid rgba(138, 130, 120, 0.12);
  /* Subtle fade at top and bottom for long lists */
  -webkit-mask-image: linear-gradient(
    to bottom,
    transparent 0%,
    black 8%,
    black 92%,
    transparent 100%
  );
  mask-image: linear-gradient(
    to bottom,
    transparent 0%,
    black 8%,
    black 92%,
    transparent 100%
  );
  /* Collapsed by default — slide in/out */
  transform: translateX(0);
  transition: transform 400ms ease, opacity 400ms ease;
  opacity: 1;
}

.sidebar.collapsed .sidebar-inner {
  transform: translateX(calc(-1 * var(--sidebar-w)));
  opacity: 0;
  pointer-events: none;
}

/* Collapsed: sidebar takes up no horizontal space */
.sidebar {
  width: var(--sidebar-w);
  transition: width 400ms ease;
}

.sidebar.collapsed {
  width: 0;
}

/* Toggle button — sits on the edge of the sidebar */
.sidebar-toggle {
  position: absolute;
  top: 1.4rem;
  right: -2rem;        /* peeks out past the panel edge */
  width: 2rem;
  height: 2rem;
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 4;
  color: var(--ink-ghost);
  transition: color 200ms ease;
}

.sidebar-toggle:hover {
  color: var(--ink-faint);
}

.sidebar-toggle-icon {
  font-size: 1.2rem;
  line-height: 1;
}

/* Sidebar content */
.sidebar-heading {
  font-size: 0.6rem;
  letter-spacing: 0.45em;
  color: var(--ink-ghost);
  text-transform: uppercase;
  margin-bottom: 1.8rem;
}

.sidebar-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.sidebar-list li a {
  font-family: 'Georgia', serif;
  font-size: 0.78rem;
  color: var(--ink-ghost);
  text-decoration: none;
  letter-spacing: 0.03em;
  line-height: 1.4;
  display: block;
  transition: color 200ms ease;
}

.sidebar-list li a:hover {
  color: var(--ink-faint);
}

.sidebar-list li.active-poem a {
  color: var(--ink-faint);
  font-style: italic;
}

/* ─────────────────────────────────────────────
   Reader main (poem + nav)
───────────────────────────────────────────── */
.reader-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-width: 0; /* prevent flex overflow */
}

/* ─────────────────────────────────────────────
   Poem display
───────────────────────────────────────────── */
.poem-display {
  flex: 1;
  width: 100%;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 4rem 3rem 2rem;
  opacity: 1;
  transition: opacity var(--transition-speed) ease;
  overflow-y: auto;
  -webkit-mask-image: linear-gradient(
    to bottom,
    transparent 0%,
    black 5%,
    black 90%,
    transparent 100%
  );
  mask-image: linear-gradient(
    to bottom,
    transparent 0%,
    black 5%,
    black 90%,
    transparent 100%
  );
}

.poem-inner {
  max-width: 560px;
  width: 100%;
  padding-bottom: 3rem;
}

.poem-title-label {
  font-size: 0.72rem;
  letter-spacing: 0.3em;
  color: var(--ink-faint);
  text-transform: uppercase;
  margin-bottom: 0.6rem;
}

.poem-author {
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  color: var(--ink-faint);
  font-style: italic;
  text-transform: none;
}

.poem-body {
  font-size: clamp(0.95rem, 2.2vw, 1.1rem);
  line-height: 2;
  color: var(--ink);
  white-space: pre-wrap;
  margin-top: 2.5rem;
}

/* Multi-part poems */
.poem-part {
  margin-bottom: 3rem;
}

.poem-part:first-child {
  margin-top: 2.5rem;
}

.poem-part-number {
  display: block;
  font-size: 0.65rem;
  letter-spacing: 0.35em;
  color: var(--ink-faint);
  margin-bottom: 1.2rem;
  font-style: normal;
}

.poem-part-text {
  font-size: clamp(0.95rem, 2.2vw, 1.1rem);
  line-height: 2;
  color: var(--ink);
  white-space: pre-wrap;
}

/* ─────────────────────────────────────────────
   Navigation
───────────────────────────────────────────── */
.nav-hints {
  display: flex;
  align-items: center;
  gap: 2rem;
  padding: 1.5rem 2rem 2rem;
}

.nav-arrow {
  font-size: 1rem;
  color: var(--ink-faint);
  cursor: pointer;
  transition: color 200ms ease, opacity 200ms ease;
  user-select: none;
  padding: 0.5rem;
}

.nav-arrow:hover {
  color: var(--ink);
}

.nav-arrow.disabled {
  opacity: 0.2;
  pointer-events: none;
}

.poem-counter {
  font-size: 0.7rem;
  letter-spacing: 0.25em;
  color: var(--ink-faint);
  min-width: 4rem;
  text-align: center;
}

/* ─────────────────────────────────────────────
   Mobile TOC overlay (replaces sidebar on small screens)
───────────────────────────────────────────── */
.toc-overlay {
  position: fixed;
  inset: 0;
  background: var(--overlay);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 20;
  opacity: 0;
  transition: opacity 400ms ease;
}

.toc-overlay.visible {
  opacity: 1;
}

.toc-inner {
  text-align: center;
  position: relative;
  padding: 2rem;
  max-height: 90vh;
  overflow-y: auto;
}

.toc-heading {
  font-size: 0.7rem;
  letter-spacing: 0.4em;
  color: rgba(245, 242, 236, 0.4);
  text-transform: uppercase;
  margin-bottom: 2.5rem;
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.toc-list li a {
  font-family: 'Georgia', serif;
  font-size: clamp(1rem, 3vw, 1.3rem);
  color: rgba(245, 242, 236, 0.85);
  text-decoration: none;
  letter-spacing: 0.06em;
  transition: color 200ms ease;
}

.toc-list li a:hover {
  color: #f5f2ec;
}

.toc-list li.active-poem a {
  color: #f5f2ec;
  border-bottom: 1px solid rgba(245, 242, 236, 0.3);
  padding-bottom: 1px;
}

.toc-close {
  position: absolute;
  top: -1rem;
  right: -1rem;
  background: none;
  border: none;
  color: rgba(245, 242, 236, 0.35);
  font-size: 0.9rem;
  cursor: pointer;
  padding: 0.5rem;
  transition: color 200ms ease;
}

.toc-close:hover {
  color: rgba(245, 242, 236, 0.8);
}

/* ─────────────────────────────────────────────
   Mobile — hide sidebar, use overlay instead
───────────────────────────────────────────── */
@media (max-width: 680px) {
  .sidebar {
    display: none;
  }

  /* Show a floating ⋮ button for mobile TOC */
  .mobile-toc-btn {
    display: flex;
  }

  .poem-display {
    padding: 3rem 1.5rem 1.5rem;
  }

  .nav-hints {
    padding: 1rem 1.5rem 1.5rem;
  }
}

/* On desktop, hide the mobile overlay trigger entirely
   (sidebar handles it) */
@media (min-width: 681px) {
  #tocOverlay {
    display: none !important;
  }
}