/* ============================================
   READER — Metamorfosis Book Reader Styles
   jimmyfrech.com/leer
   ============================================ */

/* ─── Copy Protection ─── */
.reader-shell,
.reader-shell * {
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}
/* Also protect the gate screen text */
.gate-screen {
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}
/* Allow selecting in inputs */
.gate-input {
  -webkit-user-select: text;
  -moz-user-select: text;
  -ms-user-select: text;
  user-select: text;
}

/* ─── Layout Shell ─── */
.reader-shell {
  display: grid;
  grid-template-columns: 280px 1fr;
  grid-template-rows: auto 1fr auto;
  min-height: 100dvh;
}

.reader-topbar {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-6);
  border-bottom: 1px solid var(--color-divider);
  background: var(--color-bg);
  position: sticky;
  top: 0;
  z-index: 100;
}

.reader-brand {
  font-size: var(--text-lg);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: #141741;
  text-decoration: none;
  line-height: 1;
  transition: opacity var(--transition-interactive);
}
[data-theme="dark"] .reader-brand {
  color: var(--color-text);
}
.reader-brand:hover {
  opacity: 0.75;
}
.reader-brand .accent {
  color: var(--color-primary);
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* Progress bar */
.progress-bar-wrap {
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-divider);
}
.progress-bar-fill {
  height: 100%;
  background: var(--color-primary);
  width: 0%;
  transition: width 0.3s ease;
}

/* Hamburger button (mobile) */
.hamburger-btn {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: 6px;
  border-radius: var(--radius-md);
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text-muted);
  transition: background var(--transition-interactive), color var(--transition-interactive);
}
.hamburger-btn:hover {
  background: var(--color-surface-2);
  color: var(--color-text);
}
.hamburger-btn span {
  display: block;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: transform var(--transition-interactive), opacity var(--transition-interactive);
}
.hamburger-btn[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.hamburger-btn[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.hamburger-btn[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Progress label */
.progress-label {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

/* ─── Sidebar ─── */
.reader-sidebar {
  grid-column: 1;
  grid-row: 2;
  border-right: 1px solid var(--color-divider);
  background: var(--color-surface);
  overflow-y: auto;
  position: sticky;
  top: 57px; /* topbar height */
  height: calc(100dvh - 57px);
  padding: var(--space-6) 0;
  scrollbar-width: thin;
  scrollbar-color: var(--color-border) transparent;
}

.sidebar-label {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-text-faint);
  padding: 0 var(--space-5) var(--space-3);
}

.toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.toc-item {
  display: block;
}

.toc-link {
  display: block;
  padding: var(--space-2) var(--space-5);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  line-height: 1.4;
  transition: color var(--transition-interactive),
              background var(--transition-interactive);
  border-left: 2px solid transparent;
}

.toc-link:hover {
  color: var(--color-text);
  background: var(--color-surface-2);
}

.toc-link.is-active {
  color: var(--color-primary);
  border-left-color: var(--color-primary);
  background: var(--color-primary-highlight);
  font-weight: 500;
}

.toc-part-link {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-faint);
  padding-top: var(--space-4);
  cursor: default;
  pointer-events: none;
  border-left: none;
}

/* ─── Main Reading Area ─── */
.reader-main {
  grid-column: 2;
  grid-row: 2;
  min-width: 0; /* prevent overflow */
  padding: clamp(var(--space-8), 5vw, var(--space-16)) clamp(var(--space-6), 5vw, var(--space-12));
  max-width: 100%;
}

.reader-content-wrap {
  max-width: 68ch;
  margin: 0 auto;
}

/* ─── Gate Screen ─── */
.gate-screen {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-8) var(--space-6);
}

.gate-inner {
  width: 100%;
  max-width: 420px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
}

.gate-title {
  font-size: var(--text-3xl);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.05;
  color: #141741;
}
[data-theme="dark"] .gate-title {
  color: var(--color-text);
}
.gate-title .accent {
  color: var(--color-primary);
}

.gate-subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  font-weight: 400;
  margin-bottom: var(--space-2);
}

.gate-form {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-top: var(--space-2);
}

.gate-input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  color: var(--color-text);
  transition: border-color var(--transition-interactive),
              box-shadow var(--transition-interactive);
}
.gate-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-highlight);
}
.gate-input::placeholder {
  color: var(--color-text-faint);
}
.gate-input.is-error {
  border-color: var(--color-error);
  box-shadow: 0 0 0 3px var(--color-error-highlight);
}

.gate-btn {
  width: 100%;
  padding: var(--space-3) var(--space-6);
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition-interactive),
              transform var(--transition-interactive),
              box-shadow var(--transition-interactive);
}
.gate-btn:hover {
  background: var(--color-primary-hover);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}
.gate-btn:active {
  transform: translateY(0);
}
.gate-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.gate-error {
  display: none;
  font-size: var(--text-xs);
  color: var(--color-error);
  text-align: left;
  width: 100%;
}
.gate-error.is-visible {
  display: block;
}

.gate-disclaimer {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  margin-top: var(--space-1);
  line-height: 1.5;
}

/* ─── Chapter Content ─── */
.chapter-body {
  animation: fadeChapter 0.3s ease both;
}

@keyframes fadeChapter {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.chapter-title {
  font-size: var(--text-2xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text);
  margin-bottom: var(--space-8);
  line-height: 1.2;
}

.chapter-body p {
  font-size: 18px;
  line-height: 1.8;
  color: var(--color-text);
  margin-bottom: var(--space-5);
  max-width: none;
}

/* Part divider styling */
.part-chapter .chapter-title {
  font-size: var(--text-xl);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-primary);
  border-bottom: 1px solid var(--color-divider);
  padding-bottom: var(--space-4);
  margin-bottom: var(--space-6);
}

.part-chapter .chapter-body p {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  font-style: italic;
}

.part-chapter .chapter-body p:first-child {
  display: none; /* Hide the repeated part title in content */
}

/* ─── Chapter Navigation ─── */
.chapter-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-4);
  margin-top: clamp(var(--space-12), 6vw, var(--space-20));
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-divider);
}

.chapter-nav-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  cursor: pointer;
  text-decoration: none;
  transition: background var(--transition-interactive),
              color var(--transition-interactive),
              border-color var(--transition-interactive),
              transform var(--transition-interactive);
  min-width: 0;
  max-width: 45%;
}
.chapter-nav-btn:hover {
  background: var(--color-surface-2);
  color: var(--color-text);
  border-color: var(--color-text-muted);
  transform: translateY(-1px);
}
.chapter-nav-btn.is-hidden {
  visibility: hidden;
  pointer-events: none;
}

.nav-btn-label {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  display: block;
  line-height: 1;
  margin-bottom: 2px;
}
.nav-btn-title {
  display: block;
  line-height: 1.3;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 20ch;
}

.chapter-nav-center {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-align: center;
  white-space: nowrap;
}

/* ─── Reader Footer ─── */
.reader-footer {
  grid-column: 1 / -1;
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--color-divider);
  text-align: center;
}

.reader-footer-text {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}
.reader-footer-text a {
  color: var(--color-text-muted);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color var(--transition-interactive);
}
.reader-footer-text a:hover {
  color: var(--color-primary);
}

/* ─── Mobile Sidebar Overlay ─── */
@media (max-width: 768px) {
  .reader-shell {
    grid-template-columns: 1fr;
  }

  .hamburger-btn {
    display: flex;
  }

  .reader-sidebar {
    grid-column: 1;
    grid-row: auto;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: min(280px, 85vw);
    z-index: 200;
    height: 100dvh;
    transform: translateX(-100%);
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: var(--shadow-lg);
    padding-top: var(--space-16);
  }

  .reader-sidebar.is-open {
    transform: translateX(0);
  }

  .sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    z-index: 150;
    opacity: 0;
    transition: opacity 0.3s ease;
  }
  .sidebar-overlay.is-visible {
    display: block;
    opacity: 1;
  }

  .reader-main {
    grid-column: 1;
    padding: var(--space-6) var(--space-5);
  }

  .chapter-nav-btn .nav-btn-title {
    max-width: 14ch;
  }

  .reader-topbar {
    padding: var(--space-3) var(--space-4);
  }
}

@media (max-width: 480px) {
  .reader-content-wrap {
    max-width: 100%;
  }
  .chapter-body p {
    font-size: 17px;
  }
}