/* ==========================================================================
   Handbook Virtual Assistant : Tempat Belajar
   Design tokens
   ========================================================================== */

:root {
  --color-primary: #196189;
  --color-primary-dark: #124a68;
  --color-deep: #042e3d;

  --color-bg: #f7f9fa;
  --color-surface: #ffffff;
  --color-sidebar-bg: #042e3d;
  --color-sidebar-bg-raised: #0a3c4e;

  --color-text: #1f2a2e;
  --color-text-muted: #5b6b70;
  --color-text-on-dark: #eaf2f5;
  --color-text-on-dark-muted: #9fb8c2;

  --color-border: #dbe3e6;
  --color-border-dark: #164a63;

  --color-accent-note: #2f7a5c;
  --color-accent-note-bg: #eaf5f0;

  --font-body: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --sidebar-width: 300px;
  --content-max-width: 780px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px rgba(4, 46, 61, 0.06);
  --shadow-md: 0 4px 16px rgba(4, 46, 61, 0.10);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.65;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }
img, svg { max-width: 100%; }

a:focus-visible, button:focus-visible, summary:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: 4px;
}

.app-shell { display: flex; min-height: 100vh; }

.sidebar {
  position: fixed;
  top: 0; left: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background: var(--color-sidebar-bg);
  color: var(--color-text-on-dark);
  overflow-y: auto;
  z-index: 40;
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--color-border-dark);
}

.sidebar-brand { padding: 22px 20px 16px; }
.sidebar-brand .brand-eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-on-dark-muted);
  display: block;
  margin-bottom: 4px;
}
.sidebar-brand .brand-title { font-size: 17px; font-weight: 600; color: var(--color-text-on-dark); line-height: 1.3; }

/* ---- Sidebar search box ---- */
.sidebar-search {
  position: relative;
  padding: 0 20px 16px;
  border-bottom: 1px solid var(--color-border-dark);
}
.sidebar-search .search-icon {
  position: absolute;
  left: 32px;
  top: 10px;
  color: var(--color-text-on-dark-muted);
  pointer-events: none;
}
.sidebar-search-input {
  width: 100%;
  box-sizing: border-box;
  padding: 8px 12px 8px 34px;
  font-family: var(--font-body);
  font-size: 13.5px;
  color: var(--color-text-on-dark);
  background: var(--color-sidebar-bg-raised);
  border: 1px solid var(--color-border-dark);
  border-radius: var(--radius-sm);
  outline: none;
}
.sidebar-search-input::placeholder { color: var(--color-text-on-dark-muted); }
.sidebar-search-input:focus { border-color: var(--color-primary); }

.search-results {
  display: none;
  position: absolute;
  left: 20px;
  right: 20px;
  top: 100%;
  margin-top: 6px;
  max-height: 360px;
  overflow-y: auto;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  z-index: 70;
}
.search-results.open { display: block; }

.search-result-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--color-border);
  text-decoration: none;
}
.search-result-item:last-child { border-bottom: none; }
.search-result-item:hover { background: var(--color-bg); text-decoration: none; }
.search-result-title {
  font-weight: 600;
  font-size: 13.5px;
  color: var(--color-deep);
}
.search-result-section {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-primary);
}
.search-result-snippet {
  font-size: 12.5px;
  color: var(--color-text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.search-empty {
  padding: 14px;
  font-size: 13px;
  color: var(--color-text-muted);
}

.sidebar-nav { padding: 12px 10px 32px; flex: 1; }

.nav-group { margin-bottom: 4px; border-radius: var(--radius-sm); overflow: hidden; }
.nav-group > summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 11px 12px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--color-text-on-dark);
  border-radius: var(--radius-sm);
  transition: background 0.15s ease;
}
.nav-group > summary::-webkit-details-marker { display: none; }
.nav-group > summary:hover { background: var(--color-sidebar-bg-raised); }
.nav-group > summary .chevron {
  flex-shrink: 0; width: 16px; height: 16px;
  transition: transform 0.18s ease;
  color: var(--color-text-on-dark-muted);
}
.nav-group[open] > summary .chevron { transform: rotate(90deg); }
.nav-group[open] > summary { background: var(--color-sidebar-bg-raised); }

.nav-group-label { display: flex; align-items: baseline; gap: 8px; min-width: 0; }
.nav-group-label .group-num { font-family: var(--font-mono); font-size: 11px; color: var(--color-primary); flex-shrink: 0; }
.nav-group-label .group-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.nav-list { list-style: none; margin: 2px 0 8px; padding: 0 4px 0 14px; display: flex; flex-direction: column; gap: 1px; }
.nav-list a {
  display: block;
  padding: 8px 12px;
  font-size: 13.5px;
  color: var(--color-text-on-dark-muted);
  border-radius: var(--radius-sm);
  border-left: 2px solid transparent;
  transition: background 0.15s ease, color 0.15s ease;
}
.nav-list a:hover { background: var(--color-sidebar-bg-raised); color: var(--color-text-on-dark); text-decoration: none; }
.nav-list a.active { background: var(--color-primary); color: #ffffff; border-left-color: #ffffff; font-weight: 500; }

.hamburger {
  display: none;
}
.sidebar-overlay { display: none; }

.main {
  margin-left: var(--sidebar-width);
  flex: 1;
  min-width: 0;
  display: flex;
  justify-content: center;
  padding: 56px 32px 96px;
}
.content { width: 100%; max-width: var(--content-max-width); }

.content .part-eyebrow {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin: 0 0 8px;
}
.content h1 { font-size: 32px; font-weight: 700; line-height: 1.25; color: var(--color-deep); margin: 0 0 28px; }
.content h2 {
  font-size: 23px; font-weight: 700; color: var(--color-deep);
  margin: 48px 0 16px; padding-top: 8px; border-top: 1px solid var(--color-border);
}
.content h2:first-of-type { border-top: none; padding-top: 0; }
.content p { margin: 0 0 16px; }
.content ul, .content ol { margin: 0 0 16px; padding-left: 22px; }
.content li { margin-bottom: 6px; }

.content table { width: 100%; border-collapse: collapse; margin: 8px 0 24px; font-size: 14.5px; }
.content th, .content td { text-align: left; padding: 10px 12px; border: 1px solid var(--color-border); vertical-align: top; }
.content th { background: var(--color-bg); font-weight: 600; color: var(--color-deep); }

.callout { border-radius: var(--radius-md); padding: 18px 22px; margin: 0 0 28px; border: 1px solid transparent; }
.callout-label {
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.06em;
  text-transform: uppercase; font-weight: 600; display: block; margin-bottom: 8px;
}
.callout p:last-child { margin-bottom: 0; }
.callout-note { background: var(--color-accent-note-bg); border-color: rgba(47, 122, 92, 0.25); }
.callout-note .callout-label { color: var(--color-accent-note); }

.glossary-term {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 18px 22px;
  margin: 0 0 16px;
}
.glossary-term .term-title {
  display: block;
  font-weight: 700;
  font-size: 16px;
  color: var(--color-deep);
  margin-bottom: 8px;
}
.glossary-term .term-desc {
  margin: 0 0 12px;
  color: var(--color-text);
}
.glossary-term .term-example {
  margin: 0;
  padding-top: 10px;
  border-top: 1px dashed var(--color-border);
  font-size: 14px;
  color: var(--color-text-muted);
}
.glossary-term .term-example .example-label {
  font-weight: 600;
  color: var(--color-primary);
}

/* ==========================================================================
   Kartu perbandingan "Istilah Sering Tertukar"
   ========================================================================== */

.vs-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin: 0 0 18px;
}
.vs-card .vs-title {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 16px;
  color: var(--color-deep);
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}
.vs-card .vs-badge {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: #ffffff;
  background: var(--color-primary);
  border-radius: 999px;
  padding: 2px 10px;
  flex-shrink: 0;
}
.vs-card .vs-block {
  margin-bottom: 12px;
}
.vs-card .vs-block:last-child {
  margin-bottom: 0;
}
.vs-card .vs-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 4px;
}
.vs-card .vs-text {
  margin: 0;
  color: var(--color-text);
}

@media (max-width: 900px) {
  .sidebar {
    transform: translateX(-100%);
    transition: transform 0.22s ease;
    width: min(84vw, 320px);
    box-shadow: var(--shadow-md);
    padding-top: 64px;
  }
  .sidebar.open { transform: translateX(0); }

  .main { margin-left: 0; padding: 76px 20px 72px; }

  .sidebar-brand { padding-top: 4px; }

  /* Floating square hamburger / close button */
  .hamburger {
    display: flex;
    align-items: center;
    justify-content: center;
    position: fixed;
    top: 14px;
    left: 14px;
    width: 42px;
    height: 42px;
    border-radius: var(--radius-sm);
    background: var(--color-sidebar-bg);
    color: var(--color-text-on-dark);
    border: 1px solid var(--color-border-dark);
    cursor: pointer;
    z-index: 60;
    box-shadow: var(--shadow-md);
  }
  .hamburger .icon-close { display: none; }
  .hamburger.open .icon-burger { display: none; }
  .hamburger.open .icon-close { display: block; }

  .sidebar-overlay { display: none; position: fixed; inset: 0; background: rgba(4, 46, 61, 0.5); z-index: 39; }
  .sidebar-overlay.open { display: block; }

  .content h1 { font-size: 26px; }
  .content h2 { font-size: 20px; }
}

/* ===================== PASSWORD GATE ===================== */
html.hb-locked, html.hb-locked body{ overflow:hidden; height:100%; }
html.hb-locked .app-shell, html.hb-locked .hamburger{
  filter: blur(10px) saturate(0.9);
  pointer-events: none;
  user-select: none;
  transition: filter .2s ease;
}
#hb-auth-overlay{
  position:fixed; inset:0; z-index:9999;
  display:none;
  align-items:center; justify-content:center;
  background: rgba(4,46,61,0.6);
  backdrop-filter: blur(3px);
  padding: 20px;
}
html.hb-locked #hb-auth-overlay{ display:flex; }
#hb-auth-card{
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 34px 30px 28px;
  width: min(360px, 100%);
  box-shadow: 0 20px 60px rgba(4,46,61,0.35);
  text-align: center;
  font-family: var(--font-body);
  animation: hb-pop .18s ease;
}
@keyframes hb-pop{ from{ opacity:0; transform:translateY(6px) scale(.98); } to{ opacity:1; transform:translateY(0) scale(1); } }
#hb-auth-mark{
  width:44px; height:44px; border-radius:var(--radius-md); margin:0 auto 16px;
  background:linear-gradient(135deg, var(--color-deep), var(--color-primary));
  display:flex; align-items:center; justify-content:center;
  color:#fff; font-family: var(--font-body); font-weight:700; font-size:18px;
  box-shadow: 0 4px 12px rgba(4,46,61,0.25);
}
#hb-auth-card h2{
  font-family: var(--font-body); font-weight:700; font-size:18px;
  color: var(--color-text); margin: 0 0 6px;
}
#hb-auth-card p{
  font-size: 13.5px; color: var(--color-text-muted); margin: 0 0 20px; line-height:1.5;
}
#hb-auth-form{ display:flex; flex-direction:column; gap:10px; }
#hb-auth-input{
  width:100%; padding:11px 14px; border-radius:var(--radius-sm);
  border:1.5px solid var(--color-border); background:var(--color-bg);
  font-family: var(--font-body); font-size:14.5px; color:var(--color-text);
  outline:none; text-align:center; letter-spacing:.03em;
  transition: border-color .15s ease;
}
#hb-auth-input:focus{ border-color: var(--color-primary); }
#hb-auth-submit{
  width:100%; padding:11px 14px; border-radius:var(--radius-sm); border:none; cursor:pointer;
  background: var(--color-primary); color:#fff;
  font-family: var(--font-body); font-weight:700; font-size:14px;
  transition: background .15s ease, transform .1s ease;
}
#hb-auth-submit:hover{ background: var(--color-primary-dark); }
#hb-auth-submit:active{ transform: scale(.98); }
#hb-auth-error{
  font-size:12.5px; color:#B91C1C; min-height:16px; margin-top:2px;
  font-family: var(--font-body); font-weight:600;
}