/* ========================================
   CHAPTER PAGE SPECIFIC STYLES
======================================== */

/* Chapter Page Body */
.chapter-page {
  background: var(--color-bg-0);
}

/* Chapter Main Container */
.chapter-main {
  min-height: 100dvh;
  padding-block-start: 80px; /* Account for fixed header */
}

/* Chapter Container (Narrower reading width) */
.chapter-container {
  max-inline-size: var(--content-width);
  margin-inline: auto;
  padding-inline: var(--space-md);
}

/* ========================================
   READING CONTROLS
======================================== */

.reading-controls {
  display: flex;
  gap: var(--space-sm);
  align-items: center;
}

.control-btn {
  inline-size: 36px;
  block-size: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-smooth);

  & :is(svg, i) {
    inline-size: 18px;
    block-size: 18px;
    font-size: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  &:hover {
    background: var(--color-bg-1);
    border-color: var(--color-accent-soft);
    color: var(--color-accent);
  }
}

/* Language Selector */
.language-selector {
  position: relative;
}

.lang-dropdown {
  position: absolute;
  inset-block-start: calc(100% + var(--space-xs));
  inset-inline-end: 0;
  background: var(--color-bg-1);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-elev-3);
  padding: var(--space-xs);
  min-inline-size: 140px;
  z-index: 100;
  display: none;
  animation: slideDown 0.2s var(--ease-smooth);
  margin-top: 0.75rem;
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

.lang-option {
  inline-size: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-xs) var(--space-sm);
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  font-family: var(--font-ui);
  font-size: var(--text-sm);
  text-align: start;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-smooth);

  &:hover {
    background: var(--color-bg-2);
    color: var(--color-text-primary);
  }

  &.active {
    color: var(--color-accent);
    font-weight: var(--weight-bold);
  }

  & i {
    font-size: 12px;
  }
}

/* ========================================
   TOP NAVIGATION
======================================== */

.chapter-nav-top {
  padding-block: var(--space-md);
  border-block-end: 1px solid var(--color-border-subtle);
  background: var(--color-bg-0);
}

.nav-back {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-family: var(--font-button);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-wide);
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-smooth);

  &::after {
    display: none;
  }

  & :is(svg, i) {
    inline-size: 20px;
    block-size: 20px;
    font-size: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  &:hover {
    color: var(--color-accent);
  }
}

/* Reading Progress Bar */
.chapter-progress-container {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  block-size: 3px;
  background: var(--color-bg-1);
  z-index: 1001;

  & .chapter-progress-bar {
    block-size: 100%;
    background: linear-gradient(
      90deg,
      var(--color-accent-soft),
      var(--color-accent)
    );
    inline-size: 0%;
    transition: inline-size 150ms ease-out;
  }
}

/* ========================================
   CHAPTER IMAGES / GALLERY
======================================== */

.chapter-images {
  padding-block: var(--space-xl) 0;
  background: var(--color-bg-0);
}

.image-gallery {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  align-items: center;
}

.gallery-item {
  inline-size: 100%;
  max-inline-size: 800px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-elev-2);
  border: 1px solid var(--color-border-subtle);
  background: var(--color-bg-1);
  transition: transform var(--duration-mid) var(--ease-smooth);

  &:hover {
    transform: scale(1.01);
  }

  & img {
    display: block;
    inline-size: 100%;
    block-size: auto;
    object-fit: cover;
    aspect-ratio: 16 / 9; /* Default aspect ratio for cover/images */
  }
}

@media (width <= 768px) {
  .gallery-item img {
    aspect-ratio: auto; /* Allow natural aspect ratio on mobile */
  }
}

/* ========================================
   CHAPTER HEADER
======================================== */

.chapter-header {
  padding-block: var(--space-xl) var(--space-lg);
  text-align: center;
  border-block-end: 1px solid var(--color-border-subtle);

  & .chapter-meta {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
    margin-block-end: var(--space-md);
    font-size: var(--text-sm);
  }

  & .chapter-number {
    font-family: var(--font-button);
    font-weight: var(--weight-bold);
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wide);
  }

  & .chapter-date {
    color: var(--color-text-muted);
    font-family: var(--font-button);
    font-size: var(--text-xs);
    letter-spacing: var(--tracking-wide);
  }

  & .chapter-title {
    font-family: var(--font-title);
    font-size: var(--text-3xl);
    font-weight: var(--weight-bold);
    color: var(--color-text-primary);
    letter-spacing: var(--tracking-tight);
    line-height: var(--leading-tight);
    max-inline-size: 25ch;
    margin-inline: auto;
    text-wrap: balance;
  }
}

/* ========================================
   CHAPTER BODY
======================================== */

.chapter-body {
  padding-block: var(--space-xl);
}

/* Loading State */
.loading-state {
  text-align: center;
  padding-block: var(--space-xl);

  & .loading-spinner {
    inline-size: 48px;
    block-size: 48px;
    border: 3px solid var(--color-border-subtle);
    border-block-start-color: var(--color-accent);
    border-radius: 50%;
    margin-inline: auto;
    margin-block-end: var(--space-md);
    animation: spin 1s linear infinite;
  }

  & p {
    color: var(--color-text-muted);
    font-size: var(--text-sm);
  }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Error State */
.error-state {
  text-align: center;
  padding-block: var(--space-xl);

  & :is(svg, i) {
    inline-size: 64px;
    block-size: 64px;
    font-size: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-danger);
    margin-inline: auto;
    margin-block-end: var(--space-md);
  }

  & h2 {
    font-family: var(--font-title);
    font-size: var(--text-xl);
    color: var(--color-text-primary);
    margin-block-end: var(--space-sm);
  }

  & p {
    color: var(--color-text-secondary);
    margin-block-end: var(--space-lg);
  }
}

/* Chapter Content (Markdown Rendered) */
.chapter-content {
  line-height: var(--leading-relaxed);
  font-size: var(--text-md);
}

/* Markdown Typography */
.chapter-content {
  & h2 {
    font-family: var(--font-title);
    font-size: var(--text-xl);
    font-weight: var(--weight-bold);
    color: var(--color-text-primary);
    margin-block-start: 2.5rem;
    margin-block-end: 1.25rem;
    letter-spacing: var(--tracking-tight);
    line-height: var(--leading-tight);
    text-wrap: balance;
  }

  & h3 {
    font-family: var(--font-title);
    font-size: var(--text-lg);
    font-weight: var(--weight-bold);
    color: var(--color-text-primary);
    margin-block-start: 2rem;
    margin-block-end: 1rem;
    letter-spacing: var(--tracking-tight);
    text-wrap: balance;
  }

  & p {
    color: var(--color-text-secondary);
    margin-block-end: 1.75rem;
    max-inline-size: 100%;
    line-height: var(--leading-relaxed);
  }

  & strong {
    color: var(--color-text-primary);
    font-weight: 600;
  }

  & em {
    color: var(--color-text-primary);
    font-style: italic;
  }

  & blockquote {
    border-inline-start: 4px solid var(--color-accent-soft);
    padding-block: var(--space-sm);
    padding-inline: var(--space-lg);
    margin-block: 2rem;
    color: var(--color-text-secondary);
    background: var(--color-bg-1);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    font-style: italic;
    font-size: 1.1em;
  }

  & hr {
    border: none;
    block-size: 1px;
    background: var(--color-border-subtle);
    margin-block: var(--space-xl);
  }

  & :is(ul, ol) {
    margin-block: var(--space-md);
    padding-inline-start: var(--space-lg);
    color: var(--color-text-secondary);
  }

  & li {
    margin-block-end: var(--space-xs);
  }

  & code {
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
    background: var(--color-bg-1);
    padding-block: 0.2em;
    padding-inline: 0.4em;
    border-radius: var(--radius-sm);
    color: var(--color-accent-soft);
  }

  & pre {
    background: var(--color-bg-1);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin-block: var(--space-md);

    & code {
      background: none;
      padding: 0;
    }
  }
}

/* ========================================
   LIKE BUTTON
======================================== */

.like-btn {
  &.liked {
    color: var(--color-accent);
    border-color: var(--color-accent);
    background: var(--color-bg-2);
    box-shadow: 0 0 10px var(--color-accent-soft);

    & .heart-icon {
      color: var(--color-accent);
      filter: drop-shadow(0 0 4px var(--color-accent));
    }
  }

  & .heart-icon {
    transition: all var(--duration-fast) var(--ease-smooth);
  }

  &:hover .heart-icon {
    transform: scale(1.1);
  }
}

/* ========================================
   COMMENTS SECTION
======================================== */

.chapter-comments {
  padding-block: var(--space-xl);
  border-block-start: 1px solid var(--color-border-subtle);
  background: var(--color-bg-0);
}

.comments-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-block-end: var(--space-lg);
  border-block-end: 1px solid var(--color-border-subtle);
  padding-block-end: var(--space-sm);
}

.comments-title {
  font-family: var(--font-title);
  font-size: var(--text-xl);
  color: var(--color-text-primary);
}

.comment-count {
  font-family: var(--font-button);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
}

/* Comment Form */
.comment-form-container {
  margin-block-end: var(--space-xl);
}

.comment-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  padding: var(--space-lg);
  background: var(--color-bg-1);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
}

.form-user-info {
  display: flex;
  align-items: center;
  gap: var(--space-sm);

  & .user-name {
    font-family: var(--font-button);
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    color: var(--color-text-secondary);
  }
}

.comment-form textarea {
  inline-size: 100%;
  min-block-size: 100px;
  padding: var(--space-md);
  background: var(--color-bg-0);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-sm);
  color: var(--color-text-primary);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  line-height: var(--leading-normal);
  resize: vertical;
  transition: border-color var(--duration-fast) var(--ease-smooth);

  &:focus {
    outline: none;
    border-color: var(--color-accent-soft);
  }
}

.form-actions {
  display: flex;
  justify-content: flex-end;
}

.comment-login-prompt {
  text-align: center;
  padding: var(--space-xl);

  & p {
    margin-block-end: var(--space-md);
    color: var(--color-text-secondary);
  }
}

/* Comments List */
.comments-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.comment-item {
  display: flex;
  gap: var(--space-md);
  padding-block-end: var(--space-lg);
  border-block-end: 1px solid var(--color-border-subtle);
  animation: fadeIn 0.5s var(--ease-smooth);

  &:last-child {
    border-block-end: none;
  }
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.comment-content-wrapper {
  flex: 1;
}

.comment-meta {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-block-end: var(--space-xs);
}

.comment-author {
  font-family: var(--font-button);
  font-size: var(--text-sm);
  font-weight: var(--weight-bold);
  color: var(--color-text-primary);
}

.comment-date {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.comment-text {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
  white-space: pre-wrap;
}

.no-comments {
  text-align: center;
  padding: var(--space-xl);
  color: var(--color-text-muted);
  font-style: italic;
}

/* Avatar sizes */
.user-avatar.small {
  inline-size: 28px;
  block-size: 28px;

  & span {
    font-size: 10px;
  }
}

/* ========================================
   BOTTOM NAVIGATION
======================================== */

.chapter-nav-bottom {
  padding-block: var(--space-xl);
  border-block-start: 1px solid var(--color-border-subtle);
}

/* Chapter Pagination */
.chapter-pagination {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
  margin-block-end: var(--space-xl);

  & .chapter-nav-link {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md);
    background: var(--color-bg-1);
    border: 1px solid var(--color-border-subtle);
    border-radius: var(--radius-md);
    text-decoration: none;
    transition: all var(--duration-mid) var(--ease-smooth);

    &::after {
      display: none;
    }

    &:hover {
      border-color: var(--color-accent-soft);
      transform: translateY(-2px);
      box-shadow: var(--shadow-elev-1);
    }

    &.prev-chapter {
      justify-content: flex-start;
    }

    &.next-chapter {
      justify-content: flex-end;
      grid-column: 2;
    }
  }
}

/* ========================================
   LOGIN PROMPT
======================================== */

.chapter-login-prompt {
  grid-column: 2;
  padding: var(--space-lg);
  display: none; /* Controlled by JS */
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--space-sm);
  background: var(--color-bg-1);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  transition: all var(--duration-mid) var(--ease-smooth);

  & .login-prompt-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xs);
  }

  & .login-prompt-title {
    font-family: var(--font-title);
    font-size: var(--text-md);
    color: var(--color-text-primary);
    margin-block: var(--space-xs) 0;
  }

  & p {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    margin-block-end: var(--space-md);
    max-inline-size: 40ch;
  }

  & .btn-primary {
    inline-size: fit-content;
  }

  &:hover {
    border-color: var(--color-accent-soft);
    transform: translateY(-2px);
    box-shadow: var(--shadow-elev-1);
  }
}

.chapter-nav-link {
  & :is(svg, i) {
    inline-size: 20px;
    block-size: 20px;
    font-size: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-accent);
    flex-shrink: 0;
  }

  & .nav-link-content {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
  }

  & .nav-link-label {
    font-family: var(--font-button);
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wide);
    font-weight: var(--weight-medium);
  }

  & .nav-link-title {
    font-family: var(--font-title);
    font-size: var(--text-md);
    color: var(--color-text-primary);
    font-weight: var(--weight-semibold);
    letter-spacing: var(--tracking-tight);
  }
}

/* Single navigation item (when only prev or next exists) */
.chapter-pagination:has(.chapter-nav-link:only-child) {
  grid-template-columns: 1fr;
}

/* ========================================
   SHARE SECTION
======================================== */

.chapter-share {
  text-align: center;
  padding: var(--space-lg);
  background: var(--color-bg-1);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-subtle);

  & p {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    margin-block-end: var(--space-md);
  }

  & .share-buttons {
    display: flex;
    justify-content: center;
    gap: var(--space-sm);
    flex-wrap: wrap;
  }

  & .share-btn {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    padding-block: var(--space-xs);
    padding-inline: var(--space-md);
    font-family: var(--font-button);
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    letter-spacing: var(--tracking-wide);
    background: transparent;
    border: 1px solid var(--color-border-subtle);
    border-radius: var(--radius-pill);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-smooth);

    & :is(svg, i) {
      inline-size: 16px;
      block-size: 16px;
      font-size: 14px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    &:hover {
      background: var(--color-bg-2);
      border-color: var(--color-accent-soft);
      color: var(--color-accent);
    }

    &:active {
      transform: scale(0.95);
    }
  }
}

/* ========================================
   FONT SIZE VARIANTS
======================================== */

body.font-small .chapter-content {
  font-size: var(--text-sm);
}

body.font-medium .chapter-content {
  font-size: var(--text-md);
}

body.font-large .chapter-content {
  font-size: var(--text-lg);
}

/* ========================================
   RESPONSIVE
======================================== */

@media (width <= 768px) {
  .chapter-main {
    padding-block-start: 70px;
  }

  .chapter-header {
    padding-block: var(--space-lg) var(--space-md);
  }

  .chapter-title {
    font-size: var(--text-lg);
  }

  .chapter-pagination {
    grid-template-columns: 1fr;
  }

  .chapter-nav-link.next-chapter,
  .chapter-login-prompt {
    grid-column: 1;
  }

  .reading-controls {
    gap: var(--space-xs);
  }

  .control-btn {
    inline-size: 32px;
    block-size: 32px;
  }
}

@media (width <= 600px) {
  .site-title {
    display: none;
  }

  .share-buttons {
    flex-direction: column;
  }

  .share-btn {
    inline-size: 100%;
    justify-content: center;
  }
}