/* ── CSS VARIABLES ── */
:root {
  --bg:             #000000;
  --bg-surface:     #1e1e1c;
  --bg-card:        #111111;
  --bg-elevated:    #1a1a1a;
  --border:         #2C2C2A;
  --border-soft:    rgba(255,255,255,0.06);
  --border-med:     #444441;
  --text-primary:   #ffffff;
  --text-secondary: #888780;
  --text-muted:     #5F5E5A;
  --text-faint:     #444441;
  --accent:         #5F5E5A;
  --accent-hover:   #888780;
  --nav-bg:         rgba(0,0,0,0.75);
  --btn-primary-bg: #ffffff;
  --btn-primary-text: #141413;
  --toggle-track:   #2C2C2A;
  --toggle-thumb:   #888780;
  --toggle-border:  #444441;
  --link-color:     #3b82f6;
  --tag-bg:         #1a1a1a;
  --tag-border:     #2C2C2A;
  --sidebar-active: rgba(255,255,255,0.05);
  --toc-border:     #2C2C2A;
  --highlight:      rgba(255,255,255,0.03);
}
[data-theme="light"] {
  --bg:             #ffffff;
  --bg-surface:     #F9F9F9;
  --bg-card:        #F9F9F9;
  --bg-elevated:    #F1EFE8;
  --border:         #E8E8E8;
  --border-soft:    rgba(0,0,0,0.06);
  --border-med:     #D3D1C7;
  --text-primary:   #2C2C2A;
  --text-secondary: #888780;
  --text-muted:     #B4B2A9;
  --text-faint:     #D3D1C7;
  --accent:         #444441;
  --accent-hover:   #2C2C2A;
  --nav-bg:         rgba(255,255,255,0.90);
  --btn-primary-bg: #2C2C2A;
  --btn-primary-text: #F1EFE8;
  --toggle-track:   #E8E8E8;
  --toggle-thumb:   #2C2C2A;
  --toggle-border:  #D3D1C7;
  --link-color:     #2563eb;
  --tag-bg:         #F1EFE8;
  --tag-border:     #E8E8E8;
  --sidebar-active: rgba(0,0,0,0.04);
  --toc-border:     #E8E8E8;
  --highlight:      rgba(0,0,0,0.02);
}

/* ── RESET ── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html, body { overflow-x: hidden; scroll-behavior: smooth; }
html { background: #141413; }
html[data-theme="light"] { background: #ffffff; }
body {
  background: var(--bg);
  color: var(--text-primary);
  font-family: 'Sora', sans-serif;
  padding-top: 80px;
  min-height: 100vh;
  transition: background 0.35s ease, color 0.35s ease;
}

/* ── NAVBAR ── */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 60px;
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  position: fixed;
  top: 0; left: 0;
  width: 100%;
  z-index: 1000;
  transition: background 0.35s ease, border-color 0.35s ease;
}
.logo {
  font-weight: 600;
  font-size: 18px;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-primary);
  text-decoration: none;
}
.logo-icon {
  width: 32px; height: 32px;
  border-radius: 8px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  color: var(--text-muted);
  font-size: 16px;
  flex-shrink: 0;
}
.logo-text { color: var(--text-secondary); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
}
.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--text-primary); }
.btn-nav {
  background: var(--btn-primary-bg) !important;
  color: var(--btn-primary-text) !important;
  padding: 8px 18px;
  border-radius: 10px;
  font-size: 13px;
  font-weight: 600;
  transition: opacity 0.2s, transform 0.2s;
}
.btn-nav:hover { opacity: 0.88; transform: translateY(-1px); }

/* ── THEME TOGGLE ── */
.theme-toggle { cursor: pointer; display: flex; align-items: center; }
.toggle-track {
  width: 52px; height: 28px;
  background: var(--toggle-track);
  border: 1px solid var(--toggle-border);
  border-radius: 999px;
  position: relative;
  transition: background 0.3s, border-color 0.3s;
  display: flex; align-items: center;
  padding: 0 4px;
  justify-content: space-between;
}
.toggle-icon { font-size: 12px; z-index: 1; line-height: 1; transition: opacity 0.3s; }
.toggle-icon--moon { color: #888780; }
.toggle-icon--sun  { color: #B4B2A9; }
.toggle-thumb {
  position: absolute;
  width: 20px; height: 20px;
  background: var(--toggle-thumb);
  border-radius: 50%;
  top: 3px; left: 4px;
  transition: left 0.3s cubic-bezier(0.4,0,0.2,1), background 0.3s;
}
[data-theme="light"] .toggle-thumb { left: 28px; }

/* ── HAMBURGER ── */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.hamburger span {
  display: block;
  width: 22px; height: 2px;
  background: var(--text-secondary);
  border-radius: 2px;
  transition: background 0.2s;
}
.mobile-right {
  display: none;
  align-items: center;
  gap: 10px;
}
.theme-toggle--mobile { cursor: pointer; display: flex; align-items: center; }

/* ── MOBILE NAV ── */
.mobile-nav {
  display: none;
  flex-direction: column;
  gap: 0;
  position: fixed;
  top: 80px; left: 0;
  width: 100%;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  z-index: 999;
  transform: translateY(-110%);
  transition: transform 0.3s ease;
}
.mobile-nav.open { transform: translateY(0); }
.mobile-link {
  padding: 14px 24px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 15px;
  border-bottom: 1px solid var(--border);
  transition: background 0.2s;
}
.mobile-link:hover { background: var(--bg-surface); color: var(--text-primary); }
.mobile-cta {
  background: var(--btn-primary-bg);
  color: var(--btn-primary-text) !important;
  font-weight: 600;
  text-align: center;
}

/* ── PAGE LAYOUT ── */
.page-wrapper {
  max-width: 1100px;
  margin: 0 auto;
  padding: 60px 40px 100px;
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 60px;
  align-items: start;
}

/* ── SIDEBAR TOC ── */
.toc {
  position: sticky;
  top: 100px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.toc-header {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-faint);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 12px;
  padding-left: 12px;
}
.toc-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-radius: 8px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 13px;
  font-weight: 500;
  transition: background 0.2s, color 0.2s;
  border-left: 2px solid transparent;
}
.toc-link:hover { background: var(--sidebar-active); color: var(--text-primary); }
.toc-link.active { background: var(--sidebar-active); color: var(--text-primary); border-left-color: var(--accent-hover); }
.toc-link .toc-num {
  font-size: 10px;
  color: var(--text-faint);
  min-width: 14px;
}

/* ── CONTENT ── */
.content { min-width: 0; }

.page-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-faint);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 16px;
  background: var(--bg-elevated);
  padding: 5px 12px;
  border-radius: 6px;
  border: 1px solid var(--border);
}

.page-title {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  letter-spacing: -1px;
  color: var(--text-primary);
  margin-bottom: 10px;
  line-height: 1.15;
}

.page-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}
.meta-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--text-muted);
  background: var(--tag-bg);
  border: 1px solid var(--tag-border);
  padding: 4px 10px;
  border-radius: 6px;
}

/* ── SECTIONS ── */
.doc-section {
  margin-bottom: 52px;
  padding: 32px;
  background: var(--highlight);
  border: 1px solid var(--border-soft);
  border-radius: 16px;
  transition: border-color 0.2s, background 0.35s;
}
.doc-section:hover {
  border-color: var(--border);
}

.section-num {
  font-size: 10px;
  font-weight: 700;
  color: var(--text-faint);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 8px;
}
.section-heading {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.section-heading i {
  font-size: 16px;
  color: var(--text-muted);
  background: var(--bg-elevated);
  width: 30px; height: 30px;
  border-radius: 8px;
  display: inline-flex; align-items: center; justify-content: center;
  border: 1px solid var(--border);
  flex-shrink: 0;
}
.section-body {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.8;
}
.section-body p { margin-bottom: 12px; }
.section-body p:last-child { margin-bottom: 0; }

.doc-list {
  list-style: none;
  margin: 12px 0 4px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.doc-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}
.doc-list li::before {
  content: "";
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--accent-hover);
  margin-top: 8px;
  flex-shrink: 0;
}

.doc-link {
  color: var(--link-color);
  text-decoration: none;
  font-weight: 500;
  transition: opacity 0.2s;
}
.doc-link:hover { opacity: 0.75; }

/* ── DIVIDER ── */
.page-divider {
  height: 1px;
  background: linear-gradient(to right, transparent, var(--border), transparent);
  margin: 48px 0;
}

/* ── FOOTER ── */
footer {
  padding: 32px 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
  gap: 16px;
}
.footer-left { font-size: 14px; font-weight: 600; color: var(--text-muted); display: flex; align-items: center; gap: 8px; }
.footer-links { display: flex; gap: 20px; }
.footer-links a { font-size: 12px; color: var(--text-faint); text-decoration: none; transition: color 0.2s; }
.footer-links a:hover { color: var(--text-secondary); }
.footer-right { font-size: 12px; color: var(--text-faint); }

/* ── BACK BUTTON ── */
.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-secondary);
  text-decoration: none;
  padding: 7px 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  font-weight: 500;
  transition: color 0.2s, border-color 0.2s, transform 0.2s;
  margin-bottom: 28px;
}
.back-btn:hover { color: var(--text-primary); border-color: var(--border-med); transform: translateX(-2px); }

/* ── RESPONSIVE ── */
@media (max-width: 1024px) {
  .navbar { padding: 14px 30px; }
  .page-wrapper { padding: 60px 24px 80px; gap: 40px; }
  footer { padding: 24px 30px; }
}
@media (max-width: 768px) {
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .mobile-nav { display: flex; }
  .mobile-right { display: flex; }
  .nav-links .theme-toggle { display: none; }
  .navbar { background: var(--bg) !important; backdrop-filter: none; -webkit-backdrop-filter: none; }
  .page-wrapper { grid-template-columns: 1fr; gap: 0; }
  .toc { display: none; }
  .doc-section { padding: 22px; }
  footer { flex-direction: column; align-items: center; text-align: center; }
}
@media (max-width: 480px) {
  .navbar { padding: 14px 20px; }
  .page-wrapper { padding: 40px 16px 80px; }
}
@media (min-width: 769px) {
  .theme-toggle--mobile { display: none; }
  .mobile-right { display: none; }
}

.logo-icon {
  width: 40px;
  height: 40px;
  position: relative;
  overflow: hidden;
  background: transparent;
  border: none;
}

.logo-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  position: absolute;
  top: 0;
  left: 0;
}

.logo-img--white {
  display: block;
}

.logo-img--dark {
  display: none;
}

[data-theme="light"] .logo-img--white {
  display: none;
}

[data-theme="light"] .logo-img--dark {
  display: block;
}