/* ==========================================================================
   NeurotechEU Student Handbook — Styling
   ========================================================================== */

/* ── Variables (re-declared for independence from front page) ── */
:root {
  --nteu-purple: #260387;
  --nteu-purple-dark: #1a025e;
  --nteu-purple-light: #5e5afe;
  --nteu-mint: #82fec8;
  --nteu-cream: #fef6e8;
  --nteu-white: #ffffff;
  --nteu-gray-50: #f9fafb;
  --nteu-gray-100: #f3f4f6;
  --nteu-gray-200: #e5e7eb;
  --nteu-gray-600: #4b5563;
  --nteu-gray-800: #1f2937;
  --nteu-radius: 12px;
  --nteu-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
  --nteu-transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── Hide default page title on handbook pages (we use node title) ── */
.page-handbook #block-neurotecheu-page-title {
  display: none;
}

/* ── Smooth in-page anchor scrolling (TOC + search deep-links) ── */
.page-handbook {
  scroll-behavior: smooth;
}

/* ── Sidebar Navigation ── */
.nteu-handbook__nav {
  position: sticky;
  top: 100px;
  flex: 0 0 280px;
  align-self: flex-start;
  background: var(--nteu-white);
  border-radius: var(--nteu-radius);
  box-shadow: var(--nteu-shadow);
  padding: 24px 0;
  overflow: hidden;
}

.nteu-handbook__nav-title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 16px;
  padding: 0 20px;
  font-family: 'Poppins', sans-serif;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--nteu-purple);
}

.nteu-handbook__nav-icon {
  flex-shrink: 0;
}

/* Mobile toggle — hidden on desktop */
.nteu-handbook__nav-toggle {
  display: none;
}

.nteu-handbook__nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.nteu-handbook__nav-item {
  border-left: 3px solid transparent;
  transition: border-color var(--nteu-transition), background var(--nteu-transition);
}

.nteu-handbook__nav-item--active {
  border-left-color: var(--nteu-purple);
  background: linear-gradient(90deg, rgba(38, 3, 135, 0.06), transparent);
}

.nteu-handbook__nav-link {
  display: block;
  padding: 10px 20px;
  color: var(--nteu-gray-600);
  text-decoration: none;
  font-size: 0.9rem;
  line-height: 1.4;
  transition: color var(--nteu-transition);
}

.nteu-handbook__nav-link:hover {
  color: var(--nteu-purple);
}

.nteu-handbook__nav-item--active > .nteu-handbook__nav-link {
  color: var(--nteu-purple);
  font-weight: 600;
}

/* Sub-navigation */
.nteu-handbook__nav-sublist {
  list-style: none;
  margin: 0;
  padding: 0 0 4px 16px;
}

.nteu-handbook__nav-subitem {
  border-left: 2px solid var(--nteu-gray-200);
}

.nteu-handbook__nav-subitem--active {
  border-left-color: var(--nteu-purple-light);
}

.nteu-handbook__nav-sublink {
  display: block;
  padding: 6px 16px;
  color: var(--nteu-gray-600);
  text-decoration: none;
  font-size: 0.85rem;
  transition: color var(--nteu-transition);
}

.nteu-handbook__nav-sublink:hover {
  color: var(--nteu-purple);
}

.nteu-handbook__nav-subitem--active .nteu-handbook__nav-sublink {
  color: var(--nteu-purple);
  font-weight: 600;
}

/* ── Collapsible sections (<details>/<summary>) ── */
.nteu-handbook__nav-section {
  width: 100%;
}

.nteu-handbook__nav-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  list-style: none;
}

/* Remove the default disclosure triangle across browsers. */
.nteu-handbook__nav-summary::-webkit-details-marker {
  display: none;
}
.nteu-handbook__nav-summary::marker {
  content: '';
}

.nteu-handbook__nav-summary .nteu-handbook__nav-link {
  flex: 1;
}

.nteu-handbook__nav-caret {
  flex-shrink: 0;
  margin-right: 16px;
  color: var(--nteu-gray-600);
  transition: transform var(--nteu-transition);
}

.nteu-handbook__nav-section[open] > .nteu-handbook__nav-summary .nteu-handbook__nav-caret {
  transform: rotate(90deg);
}

.nteu-handbook__nav-summary:hover .nteu-handbook__nav-caret {
  color: var(--nteu-purple);
}

/* Keyboard focus visibility on the summary row. */
.nteu-handbook__nav-summary:focus-visible {
  outline: 2px solid var(--nteu-purple-light);
  outline-offset: -2px;
}

/* ── Sidebar Search ── */
.nteu-handbook__search {
  padding: 0 20px 16px;
  margin-bottom: 8px;
  border-bottom: 1px solid var(--nteu-gray-200);
  position: relative;
}

.nteu-handbook__search-label {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--nteu-gray-600);
  margin-bottom: 6px;
}

.nteu-handbook__search-field {
  position: relative;
  display: flex;
  align-items: center;
}

.nteu-handbook__search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--nteu-gray-600);
  pointer-events: none;
  z-index: 1;
}

/* Qualify with input[type="search"] so the left padding beats the theme's
   global input[type="search"] { padding: 8px 12px } rule and the text clears
   the icon. */
.nteu-handbook__search input[type="search"].nteu-handbook__search-input {
  width: 100%;
  padding: 8px 12px 8px 38px;
  border: 1px solid var(--nteu-gray-200);
  border-radius: 8px;
  font-size: 0.875rem;
  color: var(--nteu-gray-800);
  background: var(--nteu-gray-50);
  transition: border-color var(--nteu-transition), background var(--nteu-transition);
}

.nteu-handbook__search input[type="search"].nteu-handbook__search-input:focus {
  outline: none;
  border-color: var(--nteu-purple-light);
  background: var(--nteu-white);
}

.nteu-handbook__search-results {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
  max-height: 320px;
  overflow-y: auto;
  border: 1px solid var(--nteu-gray-200);
  border-radius: 8px;
  background: var(--nteu-white);
  box-shadow: var(--nteu-shadow);
}

.nteu-handbook__search-result + .nteu-handbook__search-result {
  border-top: 1px solid var(--nteu-gray-100);
}

.nteu-handbook__search-link {
  display: block;
  padding: 8px 12px;
  text-decoration: none;
  transition: background var(--nteu-transition);
}

.nteu-handbook__search-link:hover,
.nteu-handbook__search-link:focus {
  background: rgba(38, 3, 135, 0.06);
}

.nteu-handbook__search-result-title {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--nteu-purple);
}

.nteu-handbook__search-result-sub {
  display: block;
  font-size: 0.78rem;
  color: var(--nteu-gray-600);
  margin-top: 2px;
}

.nteu-handbook__search-empty {
  margin: 8px 0 0;
  font-size: 0.82rem;
  color: var(--nteu-gray-600);
  font-style: italic;
}

/* Hide JS-only UI until the behavior reveals it (prevents a dead box). */
.js-only[hidden] {
  display: none;
}

/* ── Main Content Area ── */
.page-handbook .block-system-main-block {
  flex: 1;
  min-width: 0;
}

/* Clear the sticky site header when jumping to an anchor. */
.page-handbook .node__content h3,
.page-handbook .node__content h4 {
  scroll-margin-top: 100px;
}

/* ── On this page (TOC) — floated sticky right rail on wide screens ── */
.page-handbook .node__content .nteu-handbook__toc {
  margin: 0 0 24px;
}

@media (min-width: 1100px) {
  .page-handbook .node__content .nteu-handbook__toc {
    float: right;
    width: 220px;
    margin: 4px 0 24px 32px;
    position: sticky;
    top: 100px;
    background: var(--nteu-gray-50);
    border: 1px solid var(--nteu-gray-200);
    border-radius: var(--nteu-radius);
    padding: 16px;
  }
}

.nteu-handbook__toc-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  background: var(--nteu-gray-50);
  border: 1px solid var(--nteu-gray-200);
  border-radius: 8px;
  padding: 10px 14px;
  color: var(--nteu-purple);
  font-family: 'Poppins', sans-serif;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
}

.nteu-handbook__toc-toggle svg {
  transition: transform var(--nteu-transition);
}

.nteu-handbook__toc-toggle[aria-expanded="true"] svg {
  transform: rotate(180deg);
}

.nteu-handbook__toc-title {
  font-family: 'Poppins', sans-serif;
}

.nteu-handbook__toc-list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
}

.nteu-handbook__toc-item {
  margin: 0;
  line-height: 1.3;
}

.nteu-handbook__toc-item--level-4 {
  padding-left: 14px;
}

.nteu-handbook__toc-link {
  display: block;
  padding: 5px 0;
  font-size: 0.85rem;
  color: var(--nteu-gray-600);
  text-decoration: none;
  border-left: 2px solid transparent;
  padding-left: 10px;
  transition: color var(--nteu-transition), border-color var(--nteu-transition);
}

.nteu-handbook__toc-link:hover {
  color: var(--nteu-purple);
  border-left-color: var(--nteu-purple-light);
}

/* On wide screens the toggle button is hidden; the list shows always. */
@media (min-width: 1100px) {
  .nteu-handbook__toc-toggle {
    pointer-events: none;
  }
  .nteu-handbook__toc-toggle svg {
    display: none;
  }
  .nteu-handbook__toc-list {
    display: block;
  }
}

/* Below 1100px the TOC is full-width and collapsible. */
@media (max-width: 1099px) {
  .nteu-handbook__toc-list {
    display: none;
  }
  .nteu-handbook__toc-list--open {
    display: block;
  }
}

/* ── Prev / Next pager ── */
.nteu-handbook__pager {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--nteu-gray-200);
  clear: both;
}

.nteu-handbook__pager-spacer {
  flex: 1;
}

.nteu-handbook__pager-link {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1;
  max-width: 48%;
  padding: 14px 18px;
  border: 1px solid var(--nteu-gray-200);
  border-radius: var(--nteu-radius);
  text-decoration: none;
  color: var(--nteu-gray-800);
  transition: border-color var(--nteu-transition), box-shadow var(--nteu-transition), transform var(--nteu-transition);
}

.nteu-handbook__pager-link:hover {
  border-color: var(--nteu-purple-light);
  box-shadow: var(--nteu-shadow);
  transform: translateY(-1px);
}

.nteu-handbook__pager-link--next {
  margin-left: auto;
  text-align: right;
  flex-direction: row;
  justify-content: flex-end;
}

.nteu-handbook__pager-arrow {
  flex-shrink: 0;
  color: var(--nteu-purple);
}

.nteu-handbook__pager-text {
  display: flex;
  flex-direction: column;
}

.nteu-handbook__pager-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--nteu-gray-600);
}

.nteu-handbook__pager-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--nteu-purple);
}

.page-handbook .node__content {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--nteu-gray-800);
}

.page-handbook .node__content h1,
.page-handbook .node__content h2,
.page-handbook .node__content h3 {
  font-family: 'Poppins', sans-serif;
  color: var(--nteu-purple);
  margin-top: 1.5em;
}

.page-handbook .node__content h1 {
  font-size: 2rem;
  margin-top: 0;
  margin-bottom: 0.5em;
  padding-bottom: 12px;
  border-bottom: 3px solid var(--nteu-mint);
}

.page-handbook .node__content h2 {
  font-size: 1.5rem;
  margin-bottom: 0.5em;
}

.page-handbook .node__content h3 {
  font-size: 1.15rem;
  color: var(--nteu-purple-dark);
}

.page-handbook .node__content p {
  margin-bottom: 1em;
}

.page-handbook .node__content ul,
.page-handbook .node__content ol {
  margin-bottom: 1em;
  padding-left: 1.5em;
}

.page-handbook .node__content li {
  margin-bottom: 0.4em;
}

.page-handbook .node__content a {
  color: var(--nteu-purple-light);
  text-decoration: underline;
  text-decoration-color: rgba(94, 90, 254, 0.3);
  text-underline-offset: 2px;
  transition: color var(--nteu-transition), text-decoration-color var(--nteu-transition);
}

.page-handbook .node__content a:hover {
  color: var(--nteu-purple);
  text-decoration-color: var(--nteu-purple);
}

/* ── Tables ── */
.page-handbook .node__content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5em 0;
  font-size: 0.9rem;
  border-radius: var(--nteu-radius);
  overflow: hidden;
  box-shadow: var(--nteu-shadow);
}

.page-handbook .node__content thead th {
  background: var(--nteu-purple);
  color: var(--nteu-white);
  padding: 12px 16px;
  text-align: left;
  font-weight: 600;
}

.page-handbook .node__content tbody td {
  padding: 10px 16px;
  border-bottom: 1px solid var(--nteu-gray-200);
}

.page-handbook .node__content tbody tr:nth-child(even) {
  background: var(--nteu-gray-50);
}

.page-handbook .node__content tbody tr:hover {
  background: rgba(130, 254, 200, 0.1);
}

/* ── Info / highlight boxes ── */
.page-handbook .node__content blockquote {
  background: var(--nteu-cream);
  border-left: 4px solid var(--nteu-purple);
  padding: 16px 20px;
  margin: 1.5em 0;
  border-radius: 0 var(--nteu-radius) var(--nteu-radius) 0;
  font-size: 0.95rem;
}

.page-handbook .node__content blockquote p:last-child {
  margin-bottom: 0;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .nteu-handbook__nav {
    position: static;
    flex: none;
    margin-bottom: 24px;
    padding: 16px 0;
  }

  .nteu-handbook__pager {
    flex-direction: column;
  }

  .nteu-handbook__pager-link {
    max-width: 100%;
  }

  .nteu-handbook__pager-link--next {
    margin-left: 0;
  }

  .nteu-handbook__nav-title {
    margin-bottom: 0;
    padding: 0 16px;
  }

  .nteu-handbook__nav-toggle {
    display: flex;
    align-items: center;
    gap: 6px;
    background: none;
    border: 1px solid var(--nteu-gray-200);
    border-radius: 6px;
    padding: 8px 12px;
    margin: 12px 16px 0;
    color: var(--nteu-purple);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    width: calc(100% - 32px);
    justify-content: center;
  }

  .nteu-handbook__nav-toggle svg {
    transition: transform var(--nteu-transition);
  }

  .nteu-handbook__nav-toggle[aria-expanded="true"] svg {
    transform: rotate(180deg);
  }

  .nteu-handbook__nav-list {
    display: none;
    margin-top: 12px;
  }

  .nteu-handbook__nav-list.nteu-handbook__nav-list--open {
    display: block;
  }
}

@media (min-width: 769px) {
  .nteu-handbook__nav-toggle {
    display: none;
  }
}