/* ========================================
   DS-Style Instruction Manual
   ======================================== */

/* --- CSS Custom Properties --- */
:root {
  --manual-paper: #f5f0e8;
  --manual-paper-dark: #ebe4d6;
  --manual-edge: #c4b89a;
  --manual-brown-start: #362c24;
  --manual-brown-end: #736356;
  --manual-gold: #c29544;
  --manual-gold-light: #eee29b;
  --manual-text: #2c2420;
  --manual-text-light: #5a4e44;
  --manual-text-muted: #8a7e74;
  --manual-spine-gold: #b8923e;

  /* Section accent colors */
  --accent-brown: #6b4c3b;
  --accent-olive: #5c6b3b;
  --accent-amber: #8b6914;
  --accent-steel: #4a6278;
  --accent-mauve: #6b4a6b;
  --accent-sage: #4a6b5c;

  --page-width: 720px;
  --page-min-height: 680px;
  --nav-height: 56px;
}

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

body.manual-body {
  font-family: 'M PLUS Rounded 1c', 'Noto Sans JP', sans-serif;
  background-color: #4a3f35;
  color: var(--manual-text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* --- Header --- */
.manual-header {
  background: linear-gradient(to bottom, var(--manual-brown-end), var(--manual-brown-start));
  padding: 12px 24px;
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 3px solid var(--manual-gold);
}

.manual-header-content {
  max-width: var(--page-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.manual-header-back {
  color: #fff;
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  opacity: 0.85;
  transition: opacity 0.2s;
}

.manual-header-back:hover {
  opacity: 1;
  color: var(--manual-gold-light);
}

.manual-header-title {
  color: var(--manual-gold-light);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.manual-lang-switch {
  display: flex;
  gap: 8px;
}

.manual-lang-switch a {
  color: #d6cfc1;
  text-decoration: none;
  font-size: 13px;
  font-weight: 500;
  padding: 2px 8px;
  border-radius: 4px;
  transition: all 0.2s;
}

.manual-lang-switch a:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.1);
}

.manual-lang-switch a.active {
  color: var(--manual-brown-start);
  background: var(--manual-gold);
}

/* --- Page Container --- */
.manual-container {
  max-width: var(--page-width);
  margin: 0 auto;
  padding: 24px 16px 100px;
}

/* --- Page (each page) --- */
.manual-page {
  background: var(--manual-paper);
  border: 1px solid var(--manual-edge);
  border-radius: 2px 6px 6px 2px;
  min-height: var(--page-min-height);
  padding: 48px 48px 60px 56px;
  position: relative;
  box-shadow:
    4px 4px 12px rgba(0, 0, 0, 0.15),
    1px 1px 3px rgba(0, 0, 0, 0.1),
    inset -2px 0 8px rgba(0, 0, 0, 0.03);
  margin-bottom: 0;
}

/* Spine (left binding) */
.manual-page::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 20px;
  height: 100%;
  background: linear-gradient(
    to right,
    var(--manual-spine-gold) 0%,
    #d4aa5a 40%,
    var(--manual-paper) 100%
  );
  border-right: 1px dashed var(--manual-edge);
  border-radius: 2px 0 0 2px;
  opacity: 0.5;
}

/* Page number */
.manual-page::after {
  content: attr(data-page);
  position: absolute;
  bottom: 20px;
  font-size: 12px;
  color: var(--manual-text-muted);
  font-weight: 500;
}

.manual-page[data-page]::after {
  right: 32px;
}

.manual-page.page-even::after {
  right: auto;
  left: 32px;
}

/* --- Cover Page --- */
.page-cover {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  min-height: var(--page-min-height);
  background: linear-gradient(135deg, #f5f0e8 0%, #ebe4d6 100%);
  border: 3px solid var(--manual-gold);
  border-radius: 6px;
}

.page-cover::before {
  display: none;
}

.page-cover::after {
  display: none;
}

.cover-border {
  border: 2px solid var(--manual-gold);
  border-radius: 4px;
  padding: 48px 40px;
  width: 85%;
  max-width: 480px;
}

.cover-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 24px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.cover-icon img {
  border-radius: 18px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

.cover-title {
  font-size: 28px;
  font-weight: 800;
  color: var(--manual-brown-start);
  letter-spacing: 1px;
  margin-bottom: 4px;
}

.cover-subtitle {
  font-size: 18px;
  font-weight: 700;
  color: var(--manual-gold);
  margin-bottom: 24px;
}

.cover-meta {
  font-size: 13px;
  color: var(--manual-text-muted);
  line-height: 1.8;
}

.cover-rating {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
  padding: 4px 16px;
  border: 1px solid var(--manual-edge);
  border-radius: 4px;
  font-size: 12px;
  font-weight: 700;
  color: var(--manual-text-light);
}

/* --- Chapter Header --- */
.chapter-header {
  background: linear-gradient(to right, var(--manual-brown-start), var(--manual-brown-end));
  color: #fff;
  padding: 12px 20px;
  margin: -48px -48px 28px -56px;
  padding-left: 44px;
  border-radius: 0 6px 0 0;
  position: relative;
}

.chapter-header::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--manual-gold);
}

.chapter-number {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--manual-gold);
  display: block;
  margin-bottom: 2px;
}

.chapter-header .chapter-title {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 0.5px;
  color: var(--manual-paper);
}

/* Section accent strip on chapter header */
.chapter-header[data-accent="brown"] { border-left: 4px solid var(--accent-brown); }
.chapter-header[data-accent="olive"] { border-left: 4px solid var(--accent-olive); }
.chapter-header[data-accent="amber"] { border-left: 4px solid var(--accent-amber); }
.chapter-header[data-accent="steel"] { border-left: 4px solid var(--accent-steel); }
.chapter-header[data-accent="mauve"] { border-left: 4px solid var(--accent-mauve); }
.chapter-header[data-accent="sage"] { border-left: 4px solid var(--accent-sage); }

/* --- Table of Contents --- */
.toc-title {
  font-size: 22px;
  font-weight: 800;
  color: var(--manual-brown-start);
  text-align: center;
  margin-bottom: 32px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--manual-gold);
}

.toc-list {
  list-style: none;
}

.toc-item {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 0;
  border-bottom: 1px dotted var(--manual-edge);
  cursor: pointer;
  transition: background 0.15s;
}

.toc-item:hover {
  background: rgba(194, 149, 68, 0.08);
}

.toc-item-page {
  font-size: 13px;
  font-weight: 700;
  color: var(--manual-gold);
  min-width: 24px;
  text-align: right;
}

.toc-item-title {
  font-size: 14px;
  font-weight: 500;
  color: var(--manual-text);
  flex: 1;
}

.toc-item-dots {
  flex: 1;
  border-bottom: 1px dotted var(--manual-edge);
  min-width: 20px;
  margin-bottom: 4px;
}

/* --- Content Typography --- */
.manual-page h2 {
  font-size: 18px;
  font-weight: 700;
  color: var(--manual-brown-start);
  margin: 24px 0 12px;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--manual-gold);
}

.manual-page h3 {
  font-size: 15px;
  font-weight: 700;
  color: var(--accent-brown);
  margin: 20px 0 8px;
}

.manual-page p {
  font-size: 14px;
  margin-bottom: 12px;
  line-height: 1.8;
}

.manual-page ul,
.manual-page ol {
  font-size: 14px;
  padding-left: 20px;
  margin-bottom: 12px;
}

.manual-page li {
  margin-bottom: 4px;
  line-height: 1.7;
}

/* --- Callout Boxes --- */
.callout {
  border-radius: 6px;
  padding: 14px 16px;
  margin: 16px 0;
  font-size: 13px;
  line-height: 1.7;
  position: relative;
  padding-left: 40px;
}

.callout::before {
  position: absolute;
  left: 14px;
  top: 13px;
  font-size: 16px;
}

.callout-tip {
  background: rgba(194, 149, 68, 0.1);
  border: 1px solid var(--manual-gold);
  border-left: 3px solid var(--manual-gold);
}

.callout-tip::before {
  content: '💡';
}

.callout-warning {
  background: rgba(180, 60, 40, 0.06);
  border: 1px solid #c0694a;
  border-left: 3px solid #c0694a;
}

.callout-warning::before {
  content: '⚠';
}

.callout-note {
  background: rgba(0, 0, 0, 0.03);
  border: 1px solid var(--manual-edge);
  border-left: 3px solid var(--manual-text-muted);
}

.callout-note::before {
  content: '📝';
}

.callout-title {
  font-weight: 700;
  display: block;
  margin-bottom: 4px;
}

/* --- Screenshot Placeholder --- */
.screenshot-placeholder {
  aspect-ratio: 9 / 19.5;
  max-width: 200px;
  margin: 16px auto;
  background: linear-gradient(135deg, #e8e2d6 0%, #ddd6c8 100%);
  border: 2px dashed var(--manual-edge);
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--manual-text-muted);
  font-size: 12px;
  font-weight: 500;
  text-align: center;
  gap: 8px;
  position: relative;
}

.screenshot-placeholder::before {
  content: '📱';
  font-size: 32px;
  opacity: 0.5;
}

.screenshot-placeholder::after {
  content: attr(data-label);
  font-size: 11px;
  background: var(--manual-paper);
  padding: 2px 10px;
  border-radius: 3px;
  border: 1px solid var(--manual-edge);
}

.screenshot-placeholder img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 10px;
  display: block;
}

.screenshot-placeholder img ~ * {
  display: none;
}

/* Small screenshots inline */
.screenshot-small {
  max-width: 140px;
}

/* --- Two Column Layout --- */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  align-items: start;
  margin: 16px 0;
}

.two-col-text-ss {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 20px;
  align-items: start;
  margin: 16px 0;
}

.two-col-text-ss .screenshot-placeholder {
  max-width: 160px;
  margin: 0;
}

/* --- Tables --- */
.manual-table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 13px;
}

.manual-table th {
  background: linear-gradient(to bottom, var(--manual-brown-end), var(--manual-brown-start));
  color: #fff;
  padding: 8px 12px;
  text-align: left;
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 0.3px;
}

.manual-table th:first-child {
  border-radius: 4px 0 0 0;
}

.manual-table th:last-child {
  border-radius: 0 4px 0 0;
}

.manual-table td {
  padding: 8px 12px;
  border-bottom: 1px solid var(--manual-edge);
  vertical-align: top;
}

.manual-table tr:nth-child(even) td {
  background: rgba(0, 0, 0, 0.02);
}

.manual-table tr:last-child td {
  border-bottom: 2px solid var(--manual-gold);
}

/* --- Numbered Steps --- */
.step-list {
  list-style: none;
  counter-reset: step-counter;
  padding-left: 0;
}

.step-list li {
  counter-increment: step-counter;
  position: relative;
  padding-left: 36px;
  margin-bottom: 14px;
}

.step-list li::before {
  content: counter(step-counter);
  position: absolute;
  left: 0;
  top: 1px;
  width: 24px;
  height: 24px;
  background: var(--manual-gold);
  color: var(--manual-brown-start);
  border-radius: 50%;
  font-size: 12px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* --- Icon Grid (Shop items) --- */
.icon-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
  margin: 16px 0;
}

.icon-item {
  text-align: center;
  padding: 8px 4px;
  background: rgba(0, 0, 0, 0.02);
  border: 1px solid var(--manual-edge);
  border-radius: 6px;
  font-size: 11px;
  line-height: 1.4;
}

.icon-item-emoji {
  font-size: 24px;
  display: block;
  margin-bottom: 4px;
}

.icon-item-img {
  width: 36px;
  height: 36px;
  display: block;
  margin: 0 auto 4px;
  object-fit: contain;
}

/* --- Navigation Bar (Desktop) --- */
.manual-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: linear-gradient(to bottom, var(--manual-brown-end), var(--manual-brown-start));
  border-top: 3px solid var(--manual-gold);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  z-index: 100;
  padding: 0 16px;
}

.manual-nav-btn {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #fff;
  padding: 6px 20px;
  border-radius: 6px;
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  min-width: 80px;
}

.manual-nav-btn:hover:not(:disabled) {
  background: var(--manual-gold);
  color: var(--manual-brown-start);
  border-color: var(--manual-gold);
}

.manual-nav-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.manual-nav-page {
  color: var(--manual-gold-light);
  font-size: 13px;
  font-weight: 700;
  min-width: 80px;
  text-align: center;
}

.manual-nav-toc-btn {
  background: none;
  border: 1px solid var(--manual-gold);
  color: var(--manual-gold);
  padding: 6px 14px;
  border-radius: 6px;
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

.manual-nav-toc-btn:hover {
  background: var(--manual-gold);
  color: var(--manual-brown-start);
}

/* --- Sidebar (Table of Contents overlay) --- */
.manual-sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: 280px;
  height: 100%;
  background: var(--manual-paper);
  border-right: 3px solid var(--manual-gold);
  box-shadow: 4px 0 16px rgba(0, 0, 0, 0.3);
  z-index: 200;
  transform: translateX(-100%);
  transition: transform 0.3s ease;
  overflow-y: auto;
  padding: 20px;
}

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

.manual-sidebar-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 199;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
}

.manual-sidebar-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.sidebar-close {
  position: absolute;
  top: 12px;
  right: 12px;
  background: none;
  border: none;
  font-size: 20px;
  color: var(--manual-text-muted);
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 4px;
  line-height: 1;
}

.sidebar-close:hover {
  background: rgba(0, 0, 0, 0.05);
  color: var(--manual-text);
}

.sidebar-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--manual-brown-start);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--manual-gold);
}

.sidebar-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
  color: var(--manual-text);
  transition: background 0.15s;
  border: none;
  background: none;
  width: 100%;
  text-align: left;
  font-family: inherit;
}

.sidebar-item:hover {
  background: rgba(194, 149, 68, 0.12);
}

.sidebar-item.active {
  background: rgba(194, 149, 68, 0.18);
  color: var(--accent-brown);
  font-weight: 700;
}

.sidebar-item-page {
  color: var(--manual-gold);
  font-size: 11px;
  font-weight: 700;
  min-width: 18px;
}

/* --- Comparison (theme) --- */
.comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 16px 0;
}

.comparison-item {
  text-align: center;
}

.comparison-label {
  font-size: 13px;
  font-weight: 700;
  color: var(--manual-brown-start);
  margin-bottom: 8px;
}

/* --- Credits Page --- */
.credits-content {
  text-align: center;
  padding-top: 60px;
}

.credits-logo {
  margin-bottom: 24px;
}

.credits-app-name {
  font-size: 22px;
  font-weight: 800;
  color: var(--manual-brown-start);
  margin-bottom: 8px;
}

.credits-version {
  font-size: 13px;
  color: var(--manual-text-muted);
  margin-bottom: 32px;
}

.credits-divider {
  width: 60px;
  height: 2px;
  background: var(--manual-gold);
  margin: 24px auto;
}

.credits-section-title {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--manual-text-muted);
  margin-bottom: 8px;
}

.credits-text {
  font-size: 14px;
  color: var(--manual-text);
  margin-bottom: 4px;
}

.credits-footnote {
  margin-top: 32px;
  font-size: 12px;
  color: var(--manual-text-muted);
}

/* --- Comparison description --- */
.comparison-description {
  font-size: 13px;
  margin-top: 8px;
}

.credits-link {
  color: var(--manual-gold);
  text-decoration: none;
}

.credits-link:hover {
  text-decoration: underline;
}

/* --- Desktop: Page Flip Mode --- */
@media (min-width: 769px) {
  .manual-container {
    padding-bottom: calc(var(--nav-height) + 32px);
  }

  .manual-page {
    display: none;
  }

  .manual-page.active {
    display: block;
    animation: pageIn 0.25s ease;
  }

  @keyframes pageIn {
    from {
      opacity: 0;
      transform: translateX(12px);
    }
    to {
      opacity: 1;
      transform: translateX(0);
    }
  }
}

/* --- Mobile: Scroll Mode --- */
@media (max-width: 768px) {
  .manual-nav {
    display: none;
  }

  .manual-container {
    padding: 12px 8px 40px;
  }

  .manual-page {
    display: block;
    margin-bottom: 16px;
    min-height: auto;
    padding: 32px 24px 48px 32px;
  }

  .manual-page::before {
    width: 12px;
  }

  .chapter-header {
    margin: -32px -24px 20px -32px;
    padding-left: 28px;
  }

  .two-col,
  .two-col-text-ss {
    grid-template-columns: 1fr;
  }

  .icon-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .screenshot-placeholder {
    max-width: 160px;
  }

  .page-cover {
    min-height: 400px;
  }

  .cover-border {
    padding: 32px 24px;
    width: 90%;
  }

  .cover-title {
    font-size: 22px;
  }

  .cover-subtitle {
    font-size: 16px;
  }

  .comparison-grid {
    grid-template-columns: 1fr;
  }
}

/* --- Reduced Motion --- */
@media (prefers-reduced-motion: reduce) {
  .manual-page.active {
    animation: none;
  }

  .manual-sidebar {
    transition: none;
  }

  .manual-sidebar-overlay {
    transition: none;
  }
}

/* --- Print --- */
@media print {
  .manual-nav,
  .manual-header,
  .manual-sidebar,
  .manual-sidebar-overlay {
    display: none;
  }

  .manual-page {
    display: block;
    break-inside: avoid;
    page-break-inside: avoid;
    box-shadow: none;
    border: 1px solid #ccc;
    margin-bottom: 16px;
  }

  body.manual-body {
    background: #fff;
  }
}