/* Otto Everything Manual — Premium Stylesheet */
:root {
  --gold: #C8A45A;
  --gold-dim: rgba(200,164,90,0.12);
  --gold-border: rgba(200,164,90,0.3);
  --bg: #F7F5F0;
  --bg-card: #FFFFFF;
  --bg-sidebar: #1A1714;
  --text: #1A1714;
  --text-dim: #6B635A;
  --text-on-dark: #E8E2D8;
  --border: rgba(0,0,0,0.06);
  --radius: 14px;
  --shadow: 0 2px 12px rgba(0,0,0,0.06);
  --sidebar-w: 260px;
}

* { margin:0; padding:0; box-sizing:border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  display: flex;
  min-height: 100vh;
}

/* ── Sidebar ──────────────────────────────────────────── */
.sidebar {
  width: var(--sidebar-w);
  background: var(--bg-sidebar);
  color: var(--text-on-dark);
  position: fixed;
  top: 0; left: 0; bottom: 0;
  display: flex;
  flex-direction: column;
  z-index: 100;
  transition: transform .3s ease;
}

.sidebar-header {
  padding: 24px 20px 16px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sidebar-close { display: none; background: none; border: none; color: var(--text-on-dark); font-size: 20px; cursor: pointer; }

.logo { display: flex; align-items: center; gap: 10px; }
.logo-icon { font-size: 28px; }
.logo-title { font-family: 'Outfit', sans-serif; font-weight: 700; font-size: 20px; letter-spacing: 3px; }
.logo-subtitle { font-size: 9px; letter-spacing: 2px; color: var(--gold); font-weight: 500; }

.sidebar-nav { flex: 1; overflow-y: auto; padding: 16px 12px; }

.nav-section { margin-bottom: 20px; }
.nav-section-title { font-size: 10px; letter-spacing: 1.5px; text-transform: uppercase; color: rgba(255,255,255,0.35); padding: 8px; font-weight: 600; }

.nav-link {
  display: block;
  padding: 9px 12px;
  border-radius: 10px;
  color: rgba(255,255,255,0.6);
  text-decoration: none;
  font-size: 13px;
  font-weight: 500;
  transition: all .2s;
}
.nav-link:hover { color: #fff; background: rgba(255,255,255,0.06); }
.nav-link.active { color: var(--gold); background: var(--gold-dim); border: 1px solid var(--gold-border); }

.sidebar-footer { padding: 16px 20px; border-top: 1px solid rgba(255,255,255,0.06); font-size: 11px; color: rgba(255,255,255,0.25); }

/* ── Main Content ─────────────────────────────────────── */
.main-content {
  margin-left: var(--sidebar-w);
  flex: 1;
  min-height: 100vh;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(247,245,240,0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  padding: 16px 32px;
  border-bottom: 1px solid var(--border);
}
.topbar-title { font-family: 'Outfit', sans-serif; font-size: 16px; font-weight: 600; }
.menu-toggle { display: none; background: none; border: none; font-size: 22px; cursor: pointer; margin-right: 12px; }

.content-scroll { max-width: 900px; margin: 0 auto; padding: 0 32px 64px; }

/* ── Hero ─────────────────────────────────────────────── */
.hero {
  padding: 64px 0 48px;
  text-align: center;
}
.hero-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--gold);
  background: var(--gold-dim);
  padding: 6px 16px;
  border-radius: 20px;
  border: 1px solid var(--gold-border);
  margin-bottom: 20px;
}
.hero-title {
  font-family: 'Outfit', sans-serif;
  font-size: clamp(36px, 6vw, 56px);
  font-weight: 700;
  letter-spacing: 4px;
  margin-bottom: 16px;
}
.hero-subtitle {
  font-size: 16px;
  color: var(--text-dim);
  max-width: 520px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ── Chapters ─────────────────────────────────────────── */
.chapter {
  padding: 48px 0 32px;
  border-bottom: 1px solid var(--border);
}
.chapter-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}
.chapter-number {
  font-family: 'Outfit', sans-serif;
  font-size: 12px;
  font-weight: 700;
  color: var(--gold);
  background: var(--gold-dim);
  border: 1px solid var(--gold-border);
  border-radius: 8px;
  padding: 4px 10px;
  letter-spacing: 1px;
}
.chapter h2 {
  font-family: 'Outfit', sans-serif;
  font-size: 28px;
  font-weight: 600;
}
.chapter h3 {
  font-family: 'Outfit', sans-serif;
  font-size: 18px;
  font-weight: 600;
  margin: 28px 0 12px;
  color: var(--text);
}
.chapter p {
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-dim);
  margin-bottom: 16px;
}

/* ── Image Grid ───────────────────────────────────────── */
.image-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin: 20px 0;
}

.screenshot {
  background: var(--bg-card);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  transition: transform .2s, box-shadow .2s;
}
.screenshot:hover { transform: translateY(-2px); box-shadow: 0 6px 24px rgba(0,0,0,0.1); }
.screenshot.center { max-width: 380px; margin: 20px auto; }
.screenshot.mobile { max-width: 380px; margin-left: auto; margin-right: auto; }
.screenshot.desktop { max-width: 380px; margin-left: auto; margin-right: auto; }

.screenshot img {
  width: 100%;
  display: block;
  cursor: zoom-in;
}
.screenshot figcaption {
  padding: 10px 16px;
  font-size: 12px;
  color: var(--text-dim);
  text-align: center;
  border-top: 1px solid var(--border);
}

/* ── Callout ──────────────────────────────────────────── */
.callout {
  background: var(--gold-dim);
  border: 1px solid var(--gold-border);
  border-radius: var(--radius);
  padding: 16px 20px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--text);
  margin: 20px 0;
}

/* ── Section Divider ──────────────────────────────────── */
.section-divider {
  text-align: center;
  padding: 56px 0 24px;
}
.section-divider span {
  font-family: 'Outfit', sans-serif;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--gold);
  background: var(--bg);
  padding: 0 20px;
  position: relative;
}
.section-divider::before {
  content: '';
  display: block;
  height: 1px;
  background: var(--gold-border);
  margin-bottom: -8px;
}

/* ── Lightbox ─────────────────────────────────────────── */
.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  cursor: zoom-out;
  opacity: 0;
  transition: opacity .25s;
}
.lightbox.visible { opacity: 1; }
.lightbox img { max-width: 90vw; max-height: 90vh; border-radius: 8px; box-shadow: 0 8px 40px rgba(0,0,0,0.4); }

/* ── Section Loading Indicator ────────────────────────── */
.section-loading {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 3px;
  z-index: 200;
  background: transparent;
  pointer-events: none;
  opacity: 0;
  transition: opacity .15s;
}
.section-loading.visible { opacity: 1; }
.section-loading .section-loader {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  position: absolute;
  top: 8px; left: 50%;
  transform: translateX(-50%);
  background: var(--bg-sidebar);
  color: var(--gold);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 500;
  box-shadow: 0 4px 16px rgba(0,0,0,0.25);
}

/* ── Video / Slideshow Player ─────────────────────────── */
.video-player {
  margin: 24px auto;
  border-radius: var(--radius);
  overflow: hidden;
  background: #0A0908;
  box-shadow: 0 4px 24px rgba(0,0,0,0.15);
  border: 1px solid var(--gold-border);
  max-width: 400px;
}

.slide-container {
  position: relative;
  min-height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #0A0908;
  overflow: hidden;
}

.slide-img {
  width: 100%;
  display: block;
  object-fit: contain;
  transition: opacity .35s ease;
  max-height: 600px;
}

.slide-caption {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  padding: 16px 20px 18px;
  background: linear-gradient(transparent, rgba(0,0,0,0.88));
  color: #fff;
  font-size: 13px;
  font-weight: 500;
  line-height: 1.5;
  text-shadow: 0 1px 4px rgba(0,0,0,0.6);
  min-height: 56px;
  display: flex;
  align-items: flex-end;
}

/* Loading Spinner */
.slide-loader {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(10,9,8,0.6);
  z-index: 5;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s;
}
.slide-loader.visible { opacity: 1; }

.loader-spinner {
  width: 28px;
  height: 28px;
  border: 3px solid rgba(200,164,90,0.2);
  border-top-color: var(--gold);
  border-radius: 50%;
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Controls Bar */
.slide-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  background: #131110;
  border-top: 1px solid rgba(200,164,90,0.15);
  border-bottom: 1px solid rgba(200,164,90,0.08);
}

.slide-btn {
  background: none;
  border: 1px solid rgba(200,164,90,0.25);
  color: var(--gold);
  width: 32px; height: 32px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all .2s;
  flex-shrink: 0;
}
.slide-btn:hover {
  background: var(--gold-dim);
  border-color: var(--gold-border);
}

.slide-counter {
  font-size: 12px;
  color: rgba(255,255,255,0.5);
  font-weight: 500;
  min-width: 44px;
  text-align: center;
  flex-shrink: 0;
}

.slide-progress {
  flex: 1;
  height: 3px;
  background: rgba(255,255,255,0.08);
  border-radius: 2px;
  overflow: hidden;
}
.slide-progress-bar {
  height: 100%;
  width: 0%;
  background: var(--gold);
  border-radius: 2px;
}

.subtitle-track {
  background: #131110;
  padding: 12px;
  border-top: 1px solid rgba(200,164,90,0.08);
  max-height: 240px;
  overflow-y: auto;
}

.subtitle-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.sub-item {
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 12px;
  color: rgba(255,255,255,0.45);
  cursor: pointer;
  transition: all .25s ease;
  border: 1px solid transparent;
  line-height: 1.5;
}
.sub-item:hover {
  color: rgba(255,255,255,0.7);
  background: rgba(255,255,255,0.04);
}
.sub-item.active {
  color: var(--gold);
  background: var(--gold-dim);
  border-color: var(--gold-border);
  font-weight: 500;
}

.chapter ul {
  margin: 12px 0 16px 20px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-dim);
}
.chapter ul li { margin-bottom: 4px; }

/* ── Footer ───────────────────────────────────────────── */
.manual-footer {
  text-align: center;
  padding: 48px 0 32px;
  color: var(--text-dim);
  font-size: 13px;
}

/* ── Mobile ───────────────────────────────────────────── */
@media (max-width: 768px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); box-shadow: 4px 0 24px rgba(0,0,0,0.3); }
  .sidebar-close { display: block; }
  .main-content { margin-left: 0; }
  .menu-toggle { display: inline-block; }
  .topbar { display: flex; align-items: center; padding: 14px 16px; }
  .content-scroll { padding: 0 16px 48px; }
  .hero { padding: 40px 0 32px; }
  .image-grid { grid-template-columns: 1fr; }
  .screenshot.mobile { max-width: 100%; }
  .video-player { max-width: 100%; }
}