:root {
  --bg: #ffffff;
  --surface: #f5f7fb;
  --panel: #ffffff;
  --border: #e6eaf2;
  --text: #1f2937;
  --muted: #4b5563;
  --blue: #1877F2;
  --blue-dark: #0f67d1;
  --pink: #EBAAF2;
  --pink-light: #F7DEF8;
  --lilac: #efe7ff;
  --lilac-border: #e2d6ff;
  --hover: #f3f4f6;
  --radius: 12px;
  --shadow: 0 8px 24px rgba(17,24,39,.06);
}

/* Base */
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; background: var(--bg); color: var(--text); font: 16px/1.6 "Inter","Open Sans",system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif; }

/* Header */
.header { position: sticky; top: 0; z-index: 10; display: flex; align-items: center; justify-content: space-between; padding: 10px 16px; background: #fff; border-bottom: 1px solid var(--border); }
.header-left { display: flex; align-items: center; gap: 12px; }
.logo { height: 28px; }

.open-torus { font-weight: 400; letter-spacing: 0.04em; color: #ffffff; background-color: var(--pink); border: 1px solid #e2e8f0; border-radius: 6px; padding: 8px 14px; cursor: pointer; transition: background-color 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease; }
.open-torus:hover { color:white; background-color:var(--pink-light); border-color: #cbd5e1; }
.menu-toggle { width: 36px; height: 36px; border: 1px solid var(--border); background: #fff; border-radius: 10px; cursor: pointer; }
.header-right {
  display: flex;
  align-items: center;
  gap: 8px;
}
/* General toolbar button alignment */
.search-tutorial-btn,
.home-btn,
.feedback-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 44px;
  border-radius: 8px;
  cursor: pointer;
}

/* Search tutorial button */
.search-tutorial-btn {
  background-color: #ffffff;
  color: #0f3d8a;
  padding: 0 16px;
  border: 2px solid #1e64d1;
  text-decoration: none;
}

.search-icon {
  margin-left: 8px;
  color: #1e64d1;
}


.home-btn {
  background-color: #1e64d1;
  width: 44px;
  padding: 0;
  border: none;
  transition: background-color 0.2s ease, transform 0.2s ease;
}

.home-btn:hover {
  background-color: #0f3d8a;
  transform: scale(1.05);
}

.feedback-btn {
  background-color: #34a853;    
  width: 44px;
  padding: 0;
  border: none;
  transition: background-color 0.2s ease, transform 0.2s ease;
}
.feedback-btn:hover {
  background-color: #2b8e44;
  transform: scale(1.05);
}

.home-icon,
.feedback-icon {
  width: 24px;
  height: 24px;
  object-fit: contain;
  filter: brightness(0) invert(1); /* makes white on blue */
}


/* Layout */
.main-container { display: grid; grid-template-columns: 260px 1fr; gap: 0; width: 100%; min-height: calc(100vh - 56px); background: var(--surface); transition: grid-template-columns .28s ease; }
.main-container.collapsed { grid-template-columns: 72px 1fr; }
.main-container.offcanvas { grid-template-columns: 0 1fr; }
/* layout */
.header-left { display:flex; align-items:center; gap:12px; }

.brand{
  display:inline-flex;
  align-items:center;
  gap:5px;
  text-decoration:none;
  color:var(--text);
  line-height:1.1;
}

.brand-logo{
  width:50px;               
  height:50px;
  object-fit:contain;
}

/* text styling */
:root{ --brand-size: 20px; }
.brand-oli   { color:var(--text); font-size:var(--brand-size); }
.brand-torus { color:var(--blue); font-size:var(--brand-size); }
.brand-sub   { opacity:.78; font-size:calc(var(--brand-size) * .95); }

/* responsive: hide subtitle (and optionally logo) on small screens */
@media (max-width: 640px){
  .brand-sub { display:none; }
  /* uncomment to hide logo on small screens:
  .brand-logo { display:none; }
  */
}

@media (max-width: 960px) { .main-container { grid-template-columns: 1fr; } }

/* Sidebar */
.sidebar { background: #fff; border-right: 1px solid var(--border); padding: 14px 12px; transform: translateX(0); transition: transform .28s ease; overflow-y: auto; max-height: calc(100vh - 56px); }
.main-container.offcanvas .sidebar { transform: translateX(-100%); }
.section-title { user-select: none; cursor: pointer; display: flex; align-items: center; justify-content: space-between; padding: 10px 12px; margin: 6px 6px 0; border-radius: 10px; color: #111827; background: #d8e0f9; border: 1px solid var(--border); transition: background .15s ease, border-color .15s ease; }
.section-title:hover { background: var(--hover); }
.section-title.closed { opacity: .95; }
.dropdown-icon { opacity: .65; }

.role-header {
  text-transform: uppercase;
  font-size: 0.9rem;
  color: #a5a1a1;
  padding: 12px 15px 4px;
  border-top: 1px solid #e3e3e3;
  margin-top: 10px;
}
.role-header:first-child {
  border-top: none;
  margin-top: 0;
}

.submenu {
  list-style: none;
  margin: 10px 6px;   
  padding: 0;
  display: block;    
  padding-left: 10px;
}

.submenu.collapsed { display: none; }
.submenu li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 10px 12px;
  border-radius: 10px;
  background: #fff;
  border: 1px solid var(--border);
  color: #1f2937;
  cursor: pointer;
  margin-bottom: 10px;
  transition: background-color .2s ease, color .2s ease, border-color .2s ease;
  width: 100%;
  box-sizing: border-box;
}
.submenu li:hover { background: var(--hover); border-color: #dbe6ff; }
.submenu li.selected {
  background: var(--lilac);
  border-color: var(--lilac-border);
  color: #3b2c58;
}
.submenu li .badge::after { content: attr(data-label); }
.submenu li .badge { margin-left: 12px; white-space: nowrap; }
.main-container.collapsed .submenu li span:not(.tag), .main-container.collapsed .section-title .title-text { display: none; }

/* layout */
.submenu li{ display:flex; align-items:center; justify-content:space-between; gap:8px; }
.submenu li .title{ flex:1 1 auto; min-width:0; }

/* pill badge */
.submenu li .badge{
  flex:0 0 auto;
  display:inline-flex; align-items:center; justify-content:center;
  padding:4px 10px; border-radius:999px; font-size:12px; line-height:1;
  margin-left:12px; white-space:nowrap; border:1px solid transparent;
}
.submenu li .badge::after{ content: attr(data-label); }

/* colors */
.submenu li .badge[data-level="intermediate"]{
  color:#b45309;
  font-size: 9px;
  background:#fde9d4;
  border-color:#f3d7ba;
}
.submenu li .badge[data-level="advanced"]{
  color:#7c2d12;
  font-size:9px;
  background:#fbe3d6;
  border-color:#efc6b8;
}

.content { background: #fff; border-left: 1px solid var(--border); min-height: 100%; padding: 24px; overflow: auto; position: relative; }
.main-container.offcanvas .content::after { content:""; position:absolute; inset:0; background: transparent; pointer-events:none; transition: background .28s ease; }

/* Video container */
.video-container { width: 100%; max-width: 1100px; margin: 24px auto 0; }
.video-container video { width: 100%; height: auto; display: block; background: #000; border-radius: 12px; border: 1px solid var(--border); box-shadow: var(--shadow); }
.title-bar { width: 100%; max-width: 1100px; margin: 12px auto 0; padding: 10px 14px; border-radius: 10px; background: #e9f2ff; color: #0f3d8a; font-weight: 700; border: 1px solid #d6e6ff; }
.page-content { width: 100%; max-width: 1100px; margin: 14px auto 20px; padding: 0 2px; color: var(--muted); }
.page-content h2 { color: #111827; margin: 8px 0 6px; }
.page-content p { margin: 8px 0; }

/* Buttons */
.button { background: var(--blue); color: #fff; border: none; padding: 10px 14px; border-radius: 10px; cursor: pointer; }
.button:hover { background: var(--blue-dark); }

/* Caret */
.caret { display:inline-grid; place-items:center; width:30px; height:30px; border-radius:8px; color:#9aa0ae; transition: background .15s ease, color .15s ease; }
.section-title .caret svg { transition: transform .18s ease; transform-origin: 50% 50%; }
.section-title.open .caret svg { transform: rotate(90deg); }
@media (max-width: 480px) { .caret{ width:24px; height:24px; border-radius:7px; } }

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .sidebar, .main-container { transition: none !important; }
}

/* Sidebar "spotlight" after opening from search */
@keyframes menu-spotlight {
  0%   { box-shadow: 0 0 0 0 rgba(10,80,255,.35); }
  100% { box-shadow: 0 0 0 16px rgba(10,80,255,0); }
}
.submenu li.spotlight {
  position: relative;
  animation: menu-spotlight 900ms ease-out 0s 1;
  border-color: var(--blue);
}

#searchOverlay[hidden], #searchModal[hidden] { display: none !important; }

#searchOverlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.45);
  z-index: 9998;
  backdrop-filter: blur(1px);
}

#searchModal {
  position: fixed;
  left: 50%;
  top: 10%;
  transform: translateX(-50%);
  width: min(92vw, 820px);
  max-height: 80vh;
  overflow: auto;
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 16px;
  padding: 18px;
  box-shadow: 0 12px 28px rgba(0,0,0,.18);
  z-index: 9999;
}

/* ===============================
   Scroll Isolation & Panel Behavior
   =============================== */
html, body {
  height: 100%;
  overflow: hidden; /* lock page scroll */
}

.sidebar, .content {
  overflow: auto;
  max-height: calc(100vh - 56px); /* adjust if header height changes */
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
}