/* ── Reset & base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --navy:       #0a1628;
  --navy-mid:   #112240;
  --navy-light: #1a3a5c;
  --gold:       #c9a84c;
  --gold-light: #e8c96d;
  --white:      #ffffff;
  --off-white:  #f4f5f7;
  --gray-light: #e8eaed;
  --gray-mid:   #9aa0a6;
  --gray-dark:  #5f6368;
  --text-dark:  #1a1a2e;
  --text-mid:   #3d3d5c;
  --ins-bg:     #e6f4ea;
  --ins-color:  #137333;
  --del-bg:     #fce8e6;
  --del-color:  #c5221f;
  --shadow-sm:  0 1px 3px rgba(0,0,0,0.12);
  --shadow-md:  0 4px 12px rgba(0,0,0,0.15);
  --shadow-lg:  0 8px 24px rgba(0,0,0,0.2);
  --radius:     6px;
  --top-bar-h:  56px;
}

body {
  font-family: 'Georgia', serif;
  background: var(--off-white);
  color: var(--text-dark);
  height: 100vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

/* ── Top bar ── */
#top-bar {
  height: var(--top-bar-h);
  background: var(--navy);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  box-shadow: var(--shadow-md);
  z-index: 100;
  flex-shrink: 0;
}

#top-bar-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

#logo {
  height: 32px;
  width: auto;
}

#app-title {
  color: var(--white);
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 0.5px;
}

#top-bar-center {
  display: flex;
  align-items: center;
}

#side-toggle {
  display: flex;
  background: var(--navy-light);
  border-radius: 20px;
  padding: 3px;
}

.side-btn {
  padding: 6px 20px;
  border: none;
  border-radius: 17px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  background: transparent;
  color: var(--gray-mid);
}

.side-btn.active {
  background: var(--gold);
  color: var(--navy);
  font-weight: 600;
}

#top-bar-right {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* ── Buttons ── */
.nav-btn {
  padding: 7px 16px;
  border-radius: var(--radius);
  border: 1px solid rgba(255,255,255,0.2);
  background: transparent;
  color: var(--white);
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
}

.nav-btn:hover {
  background: rgba(255,255,255,0.1);
  border-color: rgba(255,255,255,0.4);
}

.nav-btn.primary {
  background: var(--gold);
  color: var(--navy);
  border-color: var(--gold);
  font-weight: 600;
}

.nav-btn.primary:hover {
  background: var(--gold-light);
  border-color: var(--gold-light);
}

/* Pulse the Re-Compare button when it appears so it isn't missed */
.nav-btn.primary#re-compare-button {
  animation: pulse-gold 1.5s ease-in-out 3;
}

@keyframes pulse-gold {
  0%, 100% { box-shadow: 0 0 0 0 rgba(201,168,76,0.6); }
  50% { box-shadow: 0 0 0 8px rgba(201,168,76,0); }
}

.nav-btn#restart-btn {
  border-color: rgba(255,255,255,0.15);
  color: rgba(255,255,255,0.7);
  font-size: 12px;
}

.nav-btn#restart-btn:hover {
  color: var(--white);
  border-color: rgba(255,255,255,0.4);
}

/* ── Main layout ── */
#main-layout {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* ── Sidebar ── */
#sidebar {
  width: 260px;
  min-width: 260px;
  background: var(--navy-mid);
  color: var(--white);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

#sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--navy-light);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  color: var(--gold);
}

#sidebar-header button {
  background: none;
  border: none;
  color: var(--gray-mid);
  cursor: pointer;
  font-size: 16px;
  padding: 2px 6px;
  border-radius: 3px;
}

#sidebar-header button:hover {
  background: var(--navy-light);
  color: var(--white);
}

/* Collapse the sidebar to a thin strip with just the expand arrow.
   The selector carries two IDs so it beats the generic "#sidebar-header button"
   (1,0,1) rule above, so the gold / 18px arrow styling actually applies. */
#sidebar-header #sidebar-collapse-btn {
  background: none;
  border: none;
  color: var(--gold);
  cursor: pointer;
  font-size: 18px;
  padding: 4px 8px;
}

#sidebar.collapsed {
  width: 32px;
  min-width: 32px;
}

#sidebar.collapsed #table-of-contents,
#sidebar.collapsed #sidebar-header span {
  display: none;
}

/* Centre the arrow in the thin strip so the header padding doesn't clip it */
#sidebar.collapsed #sidebar-header {
  padding-left: 0;
  padding-right: 0;
  justify-content: center;
}

#table-of-contents {
  list-style: none;
  padding: 12px 0;
  overflow-y: auto;
  flex: 1;
}
/* Firefox-only fallback for the TOC, scoped so Chrome/Edge keeps the bold 8px
   gold ::-webkit-scrollbar below instead of a thin standard one */
@supports (-moz-appearance: none) {
  #table-of-contents {
    scrollbar-width: thin;
    scrollbar-color: var(--gold) var(--navy-mid);
  }
}
#table-of-contents::-webkit-scrollbar {
  height: 8px;
  width: 8px;
}
#table-of-contents::-webkit-scrollbar-thumb {
  background: var(--gold);
  border-radius: 4px;
}
#table-of-contents::-webkit-scrollbar-track {
  background: var(--navy-mid);
}

#table-of-contents li {
  padding: 8px 20px;
  font-size: 12px;
  cursor: pointer;
  border-left: 3px solid transparent;
  transition: all 0.15s;
  line-height: 1.4;
  color: rgba(255,255,255,0.7);
}

#table-of-contents li:hover {
  background: var(--navy-light);
  color: var(--white);
  border-left-color: var(--gold);
}

#table-of-contents li.section {
  font-weight: 600;
  color: var(--white);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding-top: 12px;
  display: flex;
  align-items: center;
  gap: 6px;
}

/* The collapse-arrow wrapper (the <span> around .hide-section) is the actual
   flex child of the section row, so flex-shrink belongs here, not on the input */
#table-of-contents li.section > span {
  flex-shrink: 0;
}

#table-of-contents li.subsection {
  padding-left: 48px;
}

@keyframes subtle-pulse {
  0%, 100% { background: rgba(201, 168, 76, 0.08); }
  50% { background: rgba(201, 168, 76, 0.18); }
}

#table-of-contents li.changed {
  border-left-color: var(--gold);
  color: var(--gold-light);
  background: rgba(201, 168, 76, 0.08);
  animation: subtle-pulse 2.5s ease-in-out infinite;
}

/* ── Docs area ── */
#docs-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  height: calc(100vh - var(--top-bar-h));
  padding-bottom: 0;
}

#docs-area.comparing {
  flex-direction: row;
  overflow-x: auto;
}

/* ── Upload zone ── */
#upload-zone {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px;
  overflow-y: auto;
  height: 100%;
  max-height: calc(100vh - var(--top-bar-h));
  box-sizing: border-box;
}

#upload-instructions {
  text-align: center;
  margin-bottom: 24px;
  padding: 0 20px;
  flex-shrink: 0;
}

#upload-instructions h2 {
  font-size: 24px;
  color: var(--navy);
  margin-bottom: 12px;
}

#upload-instructions p {
  color: var(--gray-dark);
  font-size: 15px;
  max-width: 480px;
  line-height: 1.6;
}

.upload-hint {
  margin-top: 8px;
  font-size: 13px !important;
  color: var(--gray-mid) !important;
}

#docs {
  display: flex;
  flex-direction: row;
  flex: 1;
  overflow-x: auto;
  overflow-y: hidden;
  height: 100%;
  width: 100%;
  align-items: flex-start;
}

/* Upload view (pre-compare): a CSS grid that auto-fits and WRAPS the upload
   cards to new rows, so 2/3/4/5+ versions never overflow off-screen or stretch
   oversized. Scoped to :not(.comparing) — NOT #upload-zone — because the
   doc-blocks live inside #upload-zone in BOTH states. */
#docs-area:not(.comparing) #docs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 240px));
  gap: 24px;
  justify-content: center;
  width: 100%;
  max-width: 1000px;
  margin: 0 auto;
  /* Override the shared base #docs (flex:1 / height:100% / overflow-y:hidden)
     so the grid sizes to its content and wrapped rows aren't clipped — the
     #upload-zone scrolls instead. */
  flex: none;
  height: auto;
  overflow: visible;
}

/* Each doc-block is now a GRID ITEM. Strip its panel chrome so only the dashed
   upload card shows, and min-width:0 lets it shrink into its grid cell. */
#docs-area:not(.comparing) .doc-block {
  border-right: none;
  min-width: 0;
  max-width: none;
  width: auto;
  height: auto;
  padding: 0;
  flex: none;
  overflow: visible;
  display: flex;
  flex-direction: column;
}

/* ...but no gap/padding in compare mode, so resize handles sit flush
   against the panel edges */
#docs-area.comparing #docs {
  gap: 0;
  padding: 0;
}

/* ── Doc blocks ── */
.doc-block {
  display: inline-flex;
  flex-direction: column;
  min-width: 320px;
  max-width: 45vw;
  flex: 1;
  height: 100%;
  overflow-y: auto;
  overflow-x: hidden;
  background: var(--white);
  border-right: 1px solid var(--gray-light);
  /* No top padding: the sticky .doc-version-header sticks to top:0 of the
     scroll container's padding box, so any top padding leaves a gap above the
     header when scrolled. Top spacing now comes from the header itself. */
  padding: 0 20px 24px;
  /* Extra clearance so the last line of content isn't hidden behind the
     fixed #legal-disclaimer bar at the bottom of the viewport */
  padding-bottom: 32px;
  font-size: 14px;
  line-height: 1.7;
  position: relative;
  flex-shrink: 0;
}

.upload-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  border: 2px dashed var(--gray-light);
  border-radius: 12px;
  padding: 40px 24px;
  text-align: center;
  transition: border-color 0.2s, background 0.2s;
  background: var(--white);
  width: 100%;
  box-sizing: border-box;
}

.upload-card:hover {
  border-color: var(--gold);
  background: rgba(201, 168, 76, 0.03);
}

.upload-icon {
  font-size: 40px;
  opacity: 0.4;
}

.upload-card .file-button {
  background: var(--navy);
  color: var(--white);
  border: none;
  padding: 8px 20px;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 13px;
  transition: background 0.2s;
}

.upload-card .file-button:hover {
  background: var(--navy-light);
}

.doc-title {
  border: none;
  border-bottom: 1px solid var(--gray-light);
  padding: 4px 8px;
  font-size: 13px;
  color: var(--gray-dark);
  text-align: center;
  width: 100%;
  background: transparent;
  outline: none;
}

/* "Version N" label inside the upload card */
.upload-label {
  font-size: 13px;
  color: var(--gray-dark);
  font-weight: 500;
}

/* Filename confirmation shown below the upload card after a file is chosen.
   Lives outside .upload-card (see index.html / docBlockTemplate) so hiding the
   card on upload doesn't hide this. Width matches the card so the centered text
   sits directly beneath it. */
.upload-text {
  font-size: 11px;
  text-align: center;
  width: 100%;
  word-break: break-word;
  color: var(--ins-color);
  margin-top: 8px;
  box-sizing: border-box;
}

.upload-text:empty {
  display: none;
  margin: 0;
}

.hide-button {
  position: absolute;
  top: 8px;
  right: 8px;
  padding: 4px 8px;
  font-size: 10px;
  font-family: inherit;
  background: var(--white);
  border: 1px solid var(--gray-light);
  border-radius: 4px;
  cursor: pointer;
  color: var(--gray-dark);
  z-index: 11;
  box-shadow: var(--shadow-sm);
  width: auto;
  white-space: nowrap;
}

.hide-button:hover {
  background: var(--navy);
  color: var(--white);
  border-color: var(--navy);
}

/* ── Document content ── */
.doc { outline: none; }

.doc h1 {
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--navy);
  border-bottom: 2px solid var(--navy);
  padding-bottom: 6px;
  margin: 24px 0 12px;
}

.doc h2 {
  font-size: 13px;
  font-weight: 600;
  color: var(--navy-light);
  margin: 16px 0 8px;
  border-bottom: 1px solid var(--gray-light);
  padding-bottom: 4px;
}

.doc p {
  font-size: 13px;
  line-height: 1.7;
  margin-bottom: 6px;
  color: var(--text-dark);
}

/* ── Redline colors ── */
ins {
  background: #c8e9d1;
  color: #0d5c2e;
  text-decoration: none;
  border-radius: 2px;
  padding: 0 2px;
  font-weight: 500;
}

del {
  background: var(--del-bg);
  color: var(--del-color);
  text-decoration: line-through;
  border-radius: 2px;
  padding: 0 1px;
}

/* ── Collapse buttons ── */
.hide-article, .hide-paragraphs, .hide-section {
  background: none;
  border: none;
  color: var(--gold);
  cursor: pointer;
  font-size: 12px;
  padding: 0 4px;
  margin-right: 6px;
  transition: transform 0.2s;
}

.hide-section {
  background: none;
  border: none;
  color: var(--gold);
  cursor: pointer;
  font-size: 11px;
  padding: 0 4px;
  margin-right: 4px;
}

/* ── Resize handle between panels (drag to resize all panels together) ── */
.expand {
  width: 6px;
  /* Stretch to the full row height — without this the empty div is 0px tall
     (because #docs uses align-items:flex-start), so the handle is unclickable */
  align-self: stretch;
  cursor: col-resize;
  background: var(--gray-light);
  flex-shrink: 0;
  transition: background 0.2s;
}
.expand:hover {
  background: var(--gold);
}

/* ── Sticky version header on each document panel ── */
.doc-version-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  background: var(--navy);
  color: var(--gold);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  /* The .hide-button now lives inside this flex header (no longer absolutely
     positioned), so the header no longer needs to reserve right-side space */
  padding: 8px 12px;
  /* margin-top 0 (doc-block now has no top padding); -20px sides bleed the
     header to the full panel width */
  margin: 0 -20px 16px -20px;
  z-index: 10;
  border-bottom: 2px solid var(--gold);
  gap: 8px;
}

/* The hide/unhide button, moved into the flex header — no absolute positioning */
.doc-version-header .hide-button {
  position: relative;
  top: auto;
  right: auto;
  margin-left: 8px;
  flex-shrink: 0;
}

/* Print button in each version ribbon */
.print-version-btn {
  background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.3);
  color: var(--gold);
  cursor: pointer;
  font-size: 15px;
  padding: 4px 10px;
  border-radius: 4px;
  transition: all 0.2s;
}
.print-version-btn:hover {
  background: var(--gold);
  color: var(--navy);
  border-color: var(--gold);
}

/* (The old .restore-tab was removed — a hidden panel now collapses to a narrow
   ~64px strip with an "Unhide" button, which serves the same purpose with one
   mechanism instead of two.) */
/* When collapsed to the 64px strip, keep the header visible so the Unhide
   button (now living inside it) stays reachable — but strip it down to just
   that button: hide the version name and print button, and shrink the header
   to fit the narrow strip. */
.panel-collapsed .doc-version-header {
  justify-content: center;
  padding: 8px 4px;
  margin: 0 -4px 12px -4px;
}
.panel-collapsed .doc-version-header .version-name,
.panel-collapsed .doc-version-header .print-version-btn {
  display: none;
}
.panel-collapsed .doc-version-header .hide-button {
  margin-left: 0;
}

/* Vertical document name shown in the collapsed 64px strip */
.collapsed-label {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-size: 11px;
  font-weight: 600;
  color: var(--navy);
  text-align: center;
  margin-top: 40px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-height: calc(100vh - 200px);
}

/* ── Reveal text button ── */
.reveal-text {
  display: block;
  margin: 8px 0;
  padding: 4px 12px;
  background: var(--off-white);
  border: 1px solid var(--gray-light);
  border-radius: 4px;
  font-size: 12px;
  color: var(--gray-dark);
  cursor: pointer;
  transition: all 0.2s;
}

.reveal-text:hover {
  background: var(--navy);
  color: var(--white);
  border-color: var(--navy);
}

/* ── Popup ── */
.popup {
  position: fixed;
  background: var(--white);
  border: 1px solid var(--gray-light);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: 16px;
  max-width: 360px;
  min-width: 200px;
  z-index: 500;
  font-size: 13px;
}

.popup .term {
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 8px;
  font-size: 13px;
  border-bottom: 1px solid var(--gray-light);
  padding-bottom: 6px;
}

.popup .definition {
  color: var(--text-mid);
  line-height: 1.6;
  font-size: 12px;
}

.close-popup-button {
  position: absolute;
  top: 8px;
  right: 8px;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--gray-mid);
  font-size: 14px;
  padding: 2px 5px;
  border-radius: 3px;
}

.close-popup-button:hover {
  background: var(--gray-light);
  color: var(--text-dark);
}

.zoom-button {
  margin-top: 10px;
  display: block;
  font-size: 11px;
  color: var(--navy-light);
  background: var(--off-white);
  border: 1px solid var(--gray-light);
  border-radius: 3px;
  padding: 3px 8px;
  cursor: pointer;
  transition: all 0.2s;
}

.zoom-button:hover {
  background: var(--navy);
  color: var(--white);
}

/* ── Definitions modal ── */
#def-modal {
  position: fixed;
  top: var(--top-bar-h);
  right: 0;
  width: 340px;
  height: calc(100vh - var(--top-bar-h));
  background: var(--white);
  border-left: 1px solid var(--gray-light);
  box-shadow: var(--shadow-lg);
  overflow-y: auto;
  z-index: 200;
  padding: 20px;
}

#def-modal h3 {
  color: var(--navy);
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--gold);
}

.definitionItem {
  font-size: 12px;
  line-height: 1.6;
  padding: 10px 0;
  border-bottom: 1px solid var(--gray-light);
  color: var(--text-mid);
}

/* ── Patent badge ── */
#patent-badge {
  font-size: 9px;
  color: rgba(255,255,255,0.4);
  letter-spacing: 0.3px;
  white-space: nowrap;
  margin-right: 8px;
}

/* ── Drag over highlight ── */
body.drag-over #upload-zone {
  background: rgba(201, 168, 76, 0.05);
  border: 2px dashed var(--gold);
}

/* ── Scrollbar styling (global) ── */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}
::-webkit-scrollbar-track {
  background: var(--gray-light);
}
::-webkit-scrollbar-thumb {
  background: var(--navy-light);
  border-radius: 5px;
  border: 2px solid var(--gray-light);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--navy);
}

/* Firefox-only fallback: scoped via @supports so it does NOT suppress the bold
   10px ::-webkit-scrollbar styling in Chrome/Edge (setting scrollbar-width there
   would make Chromium ignore the webkit pseudo-elements). */
@supports (-moz-appearance: none) {
  * {
    scrollbar-width: thin;
    scrollbar-color: var(--navy-light) var(--gray-light);
  }
}

/* ── Responsive ── */
@media (max-width: 768px) {
  #top-bar-center { display: none; }
  .doc-block { min-width: 85vw; }
}