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

:root {
  --ink:     #111;
  --dim:     #888;
  --rule:    #d0d0d0;
  --bg:      #fff;
  --serif:   'Times New Roman', Times, serif;
  --mono:    'IBM Plex Mono', 'Courier New', monospace;
  /* accent palette — deep scientific blue */
  --accent:    #1d4ed8;
  --acc-mid:   #3b82f6;
  --acc-bg:    #eff6ff;
  --accent-r:  29;
  --accent-g:  78;
  --accent-b:  216;
  /* text column fixed width */
  --text-col: 712px;
  /* PDF-exact values */
  --col-w:   295px;
  --pt-size: 12px;
  --pt-lh:   1.205;
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--serif);
  font-size: var(--body-size);
  line-height: 1.6;
}

a { color: inherit; text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── COVER PAGE ─────────────────────────────────────────── */
.cover-page {
  padding: 3.5rem 4rem 2.5rem;
  border-bottom: 2px solid var(--ink);
}

.cover-header {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: 2.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--rule);
}

.cover-seal { font-size: 1.6rem; color: var(--dim); }

.cover-motto {
  font-style: italic;
  font-size: 0.82rem;
  color: var(--dim);
  letter-spacing: 0.02em;
}

.cover-grid {
  display: grid;
  grid-template-columns: 1fr var(--panel);
  gap: 3rem;
  align-items: start;
}

/* Cover info block */
.cover-id-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 0.3rem;
}

.cover-type { font-family: var(--mono); font-size: 0.72rem; color: var(--dim); }
.cover-pnum { font-family: var(--mono); font-size: 1rem; font-weight: 500; }

.cover-name-date {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 1.2rem;
}

.cover-inventor-surname {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.cover-date { font-size: 0.8rem; color: var(--dim); font-family: var(--mono); }

.cover-divider {
  height: 1px;
  background: var(--rule);
  margin: 1rem 0;
}

/* Patent fields table */
.cover-fields {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
  line-height: 1.5;
}

.cover-fields td { padding: 0.15rem 0.5rem 0.15rem 0; vertical-align: top; }

.field-code {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--dim);
  white-space: nowrap;
  width: 2.5rem;
  padding-top: 0.22rem;
}

.field-label {
  color: var(--dim);
  white-space: nowrap;
  width: 5rem;
  font-size: 0.82rem;
}

.cover-fields tr.spacer td { height: 0.4rem; }
.claim-count { font-family: var(--mono); font-size: 0.75em; color: var(--dim); }

.cover-examiner {
  font-size: 0.78rem;
  color: var(--dim);
  margin-top: 0.6rem;
}

.cover-uspto {
  font-size: 0.78rem;
  margin-top: 0.3rem;
}

.cover-uspto a {
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* Cover model */
.cover-model-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  position: sticky;
  top: 2rem;
}

.cover-viewer {
  width: 100%;
  height: 60vh;
  background: transparent !important;
  --poster-color: transparent !important;
}

.model-tag {
  font-family: var(--mono);
  font-size: 0.62rem;
  color: var(--dim);
  margin-top: 0.5rem;
  text-align: center;
}

/* ── MAIN DOC — text full width, model floats as overlay ── */
.doc-grid {
  display: block;
}

/* ── PATENT BODY — transparent overlay; z-index above model-panel keeps text visible */
.patent-body {
  min-height: 100vh;
  pointer-events: none; /* let events fall through to viewer */
  position: relative;
  z-index: 20;
}

/* Page separator — spans both columns, three-part like the real patent */
.page-sep {
  column-span: all;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 0.3rem 0;
  margin: 1rem 0 0.9rem;
  font-family: var(--serif);
  font-size: var(--pt-size);
  color: var(--ink);
  border-top: 1px solid #999;
  border-bottom: 1px solid #999;
}

.page-sep span:nth-child(2) {
  /* center the patent number */
  text-align: center;
}

/* Page 21 title row — spans both columns */
.body-title {
  column-span: all;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding-bottom: 0.5rem;
  margin-bottom: 0.8rem;
  font-size: var(--pt-size);
}

.body-title-text {
  font-family: var(--serif);
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.body-title-num {
  font-family: var(--serif);
  font-size: 0.82rem;
  font-weight: 400;
}

/* Two-column text area — sits above viewer so text stays interactive */
.two-col {
  padding: 1.5rem 20px 2rem 32px;
  margin-left: 24px;
  column-width: var(--col-w);
  column-gap: 30px;
  column-rule: none;
  max-width: 672px;
  position: relative;
  z-index: 15;
  pointer-events: auto; /* text column is interactive; viewer works outside it */
}

section {
  margin-bottom: 1.4rem;
}

/* Section headings match PDF exactly: centered, bold, same serif, caps */
section h2 {
  font-family: var(--serif);
  font-size: var(--pt-size);
  font-weight: 700;
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 0.01em;
  line-height: var(--pt-lh);
  margin-bottom: 0.4em;
  margin-top: 0.3em;
  break-after: avoid;
  break-before: avoid;
}

section p,
.fig-list li {
  font-size: var(--pt-size);
  line-height: var(--pt-lh);
  text-align: justify;
  hyphens: auto;
  margin-bottom: 0;
  /* match PDF word spacing exactly */
  word-spacing: 0;
  letter-spacing: 0;
}

/* Line numbers — same font/size as PDF body, in left margin of each column */
.ln {
  font-family: var(--serif);
  font-size: var(--pt-size);
  color: var(--ink);
  display: inline-block;
  width: 20px;
  margin-left: -28px;
  text-align: right;
  padding-right: 5px;
  vertical-align: baseline;
  user-select: none;
}

/* ── FIG reference links ────────────────────────────────── */
.fig-ref {
  cursor: pointer;
  font-style: italic;
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-color: var(--acc-mid);
  transition: text-decoration-color 0.12s, background 0.12s;
  position: relative;
  white-space: nowrap;
  border-radius: 2px;
}

.fig-ref:hover { text-decoration-color: var(--accent); }
.fig-ref:active { background: var(--acc-bg); }

.fig-ref::after {
  content: attr(data-label);
  position: absolute;
  bottom: calc(100% + 5px);
  right: 0;
  left: auto;
  transform: none;
  background: var(--accent);
  color: #fff;
  font-family: var(--mono);
  font-size: 0.6rem;
  font-style: normal;
  white-space: nowrap;
  padding: 0.25rem 0.45rem;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.12s;
  z-index: 50;
}

.fig-ref:hover::after { opacity: 1; }

/* ── Reference numbers ──────────────────────────────────── */
.rn {
  font-style: normal;
  font-family: var(--mono);
  font-size: 0.75em;
  color: #555;
}

/* ── Figure list ────────────────────────────────────────── */
.fig-list {
  list-style: none;
  padding: 0;
  margin-bottom: 0.5rem;
  break-inside: auto;
}

.fig-list li {
  margin-bottom: 0.45rem;
  padding-left: 0;
  break-inside: avoid;
}

/* ── Inline figure ──────────────────────────────────────── */
.inline-fig {
  break-inside: avoid;
  margin: 1.2rem 0;
  text-align: center;
}

.inline-fig img {
  max-width: 100%;
  max-height: 220px;
  object-fit: contain;
}

.inline-fig figcaption {
  font-family: var(--mono);
  font-size: 0.62rem;
  color: var(--dim);
  margin-top: 0.4rem;
}

/* ── Claims ─────────────────────────────────────────────── */
.what-is-claimed { font-style: italic; margin-bottom: 0.4rem; }

.claims-list {
  padding-left: 1.2rem;
  font-size: var(--pt-size);
}

.claims-list li {
  margin-bottom: 0.25rem;
  text-align: justify;
  line-height: var(--pt-lh);
  break-inside: avoid;
  font-size: var(--pt-size);
}

.claims-list li::marker {
  font-family: var(--mono);
  font-size: 0.72em;
  color: var(--dim);
}

.end-mark {
  text-align: center;
  letter-spacing: 0.5em;
  color: var(--dim);
  margin-top: 1.5rem;
  font-size: 0.9rem;
}

/* ── PATENT INTRO — bibliographic front matter ───────────────────── */
.patent-intro {
  margin-left: 24px;
  padding: 2rem 20px 2.8rem 32px;
  max-width: 720px;
  pointer-events: auto;
  position: relative;
  z-index: 15;
  border-bottom: 2px solid var(--ink);
}

/* ── Patent front-page header ─── */
.pi-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  border-bottom: 1.5px solid var(--ink);
  padding-bottom: 0.5rem;
  margin-bottom: 1rem;
}
.pi-header-l { display: flex; flex-direction: column; }
.pi-header-r {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  text-align: right;
  gap: 0.2rem;
}

.pi-fcode {
  font-family: var(--mono);
  font-size: 0.58rem;
  color: var(--dim);
  font-weight: 400;
  letter-spacing: 0;
}
.pi-doc-type {
  font-family: var(--serif);
  font-size: 0.88rem;
  font-weight: 400;
  letter-spacing: 0;
  line-height: 1.3;
  margin-bottom: 0.05rem;
}
.pi-inventor-name {
  font-family: var(--serif);
  font-size: 2.4rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1;
}
.pi-patnum {
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--dim);
}
.pi-num {
  font-family: var(--mono);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: 0.01em;
}
.pi-date-issued {
  font-family: var(--serif);
  font-size: 0.7rem;
  color: var(--dim);
}

/* ── Title block ─── */
.pi-title-block {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 0.55rem;
  padding: 0.75rem 0 1rem;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 1.2rem;
}
.pi-title-text {
  font-family: var(--serif);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.3;
  text-transform: uppercase;
  letter-spacing: 0.025em;
  text-align: center;
}

.pi-meta-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

.pi-fields {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--serif);
  font-size: 0.78rem;
  line-height: 1.6;
}

.pi-fields td {
  padding: 0.05rem 0.4rem 0.05rem 0;
  vertical-align: top;
}

.pi-code {
  font-family: var(--mono);
  font-size: 0.6rem;
  color: var(--dim);
  white-space: nowrap;
  width: 2rem;
  padding-top: 0.22rem;
}

.pi-field-label {
  font-family: var(--mono);
  font-size: 0.62rem;
  color: var(--dim);
  white-space: nowrap;
  width: 4.5rem;
  padding-top: 0.18rem;
}

.pi-fields .pi-mono {
  font-family: var(--mono);
  font-size: 0.68rem;
}

.pi-fields tr.spacer td { height: 0.45rem; }

.pi-abstract {
  border-top: 1px solid var(--rule);
  padding-top: 1.1rem;
}

.pi-abstract-label {
  font-family: var(--mono);
  font-size: 0.62rem;
  color: var(--dim);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 0.6rem;
}

.pi-abstract p {
  font-family: var(--serif);
  font-size: 0.9rem;
  line-height: 1.6;
  text-align: justify;
  hyphens: auto;
  max-width: 64ch;
}

.pi-claims-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 1rem;
  padding-top: 0.6rem;
  border-top: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 0.62rem;
  color: var(--dim);
}

.pi-claims-row a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.pi-section-head {
  font-family: var(--serif);
  font-size: 0.7rem;
  font-weight: 700;
  text-align: center;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  padding: 0.28rem 0;
  margin: 0.9rem 0 0.55rem;
}

.pi-ref-cat {
  font-family: var(--mono);
  font-size: 0.57rem;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  text-align: center;
  margin: 0.7rem 0 0.3rem;
}

.pi-refs {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--mono);
  font-size: 0.6rem;
  line-height: 1.65;
}
.pi-refs td {
  padding: 0 0.35rem 0 0;
  vertical-align: top;
}
.pi-refs td:first-child { min-width: 5rem; }
.pi-refs td:nth-child(2) { min-width: 1.8rem; }
.pi-refs td:nth-child(3) { min-width: 3rem; color: var(--dim); }

.pi-ref-other {
  font-family: var(--serif);
  font-size: 0.68rem;
  line-height: 1.5;
  margin: 0.3rem 0 0;
}

.pi-ref-continued {
  font-family: var(--serif);
  font-size: 0.62rem;
  color: var(--dim);
  margin: 0.15rem 0 0.5rem;
}

.pi-notice-cell {
  font-size: 0.7rem;
  color: var(--dim);
  line-height: 1.5;
}

.pi-examiner {
  margin-top: 1rem;
  padding-top: 0.8rem;
  border-top: 1px solid var(--rule);
  font-family: var(--serif);
  font-size: 0.72rem;
  line-height: 1.8;
}
.pi-examiner p { margin: 0; }

/* ── MODEL PANEL — full-screen transparent overlay ───────────────── */
.model-panel {
  position: fixed;
  inset: 0;
  background: transparent;
  pointer-events: none;
  z-index: 16;
}

/* ── Part tree panel — top right ────────────────────── */
.part-tree-panel {
  position: absolute;
  top: 3.8rem;
  right: 1.2rem;
  width: 230px;
  max-height: calc(100vh - 12rem);
  overflow-y: auto;
  background: rgba(255,255,255,0.94);
  backdrop-filter: blur(8px);
  border: 1px solid var(--rule);
  border-top: 2px solid var(--accent);
  pointer-events: auto;
  z-index: 20;
  box-shadow: 0 2px 16px rgba(0,0,0,0.06);
}

/* Model selector tabs — inside tree panel header */
.model-tabs {
  display: flex;
  gap: 0.25rem;
  flex-wrap: wrap;
  padding: 0.4rem;
  border-bottom: 1px solid var(--rule);
  pointer-events: auto;
}

.mtab {
  flex: 1;
  min-width: 0;
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.04em;
  padding: 0.3rem 0.4rem;
  border: 1px solid var(--rule);
  background: transparent;
  cursor: pointer;
  color: var(--dim);
  transition: all 0.12s;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.mtab:hover { border-color: var(--accent); color: var(--accent); }
.mtab.active { background: var(--accent); color: #fff; border-color: var(--accent); }

/* Viewer — full screen; JS partition disables pointer-events when mouse is over text */
.viewer-wrap {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  pointer-events: auto;
}

.main-viewer {
  width: 100%;
  height: 100%;
  background: transparent !important;
  --poster-color: transparent !important;
  --progress-bar-color: transparent;
  filter:
    url(#model-outline)
    drop-shadow(0 2px 8px  rgba(0,0,0,0.14))
    drop-shadow(0 6px 32px rgba(0,0,0,0.09));
  transform: translateX(15vw);
}

/* ── Hotspot annotations ────────────────────────────────── */
.hs {
  border: none;
  background: transparent;
  cursor: pointer;
  padding: 0;
  display: flex;
  align-items: center;
}

.hs-t {
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.03em;
  background: rgba(255,255,255,0.82);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(0,0,0,0.1);
  padding: 0.22rem 0.6rem;
  border-radius: 2rem;
  white-space: nowrap;
  color: var(--ink);
  box-shadow: 0 1px 6px rgba(0,0,0,0.13);
  transition: background 0.15s, box-shadow 0.15s, color 0.15s;
}

.hs:hover .hs-t {
  background: rgba(var(--accent-r),var(--accent-g),var(--accent-b),0.12);
  box-shadow: 0 2px 10px rgba(0,0,0,0.18);
}

.hs.hs-active .hs-t {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  box-shadow: 0 2px 10px rgba(var(--accent-r),var(--accent-g),var(--accent-b),0.35);
}

/* ── Trackball gizmo + controls hint — bottom left ─────── */
.gizmo-panel {
  position: absolute;
  bottom: 1.8rem;
  right: calc(260px + 2.4rem); /* sits left of the view-section cluster */
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.6rem;
  pointer-events: auto;
}

.gizmo-canvas {
  display: block;
  border-radius: 50%;
  cursor: grab;
  box-shadow: 0 2px 10px rgba(0,0,0,0.18), 0 0 0 1px rgba(120,145,200,0.25);
  transition: box-shadow 0.15s;
}

.gizmo-canvas:hover {
  box-shadow: 0 3px 14px rgba(0,0,0,0.24), 0 0 0 1.5px rgba(120,145,200,0.45);
}

.gizmo-canvas:active { cursor: grabbing; }

.controls-hint {
  background: rgba(255,255,255,0.88);
  backdrop-filter: blur(8px);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 0.42rem 0.6rem;
  display: flex;
  flex-direction: column;
  gap: 0.22rem;
  pointer-events: none;
}

.ch-item {
  display: flex;
  align-items: center;
  gap: 0.38rem;
  font-family: var(--mono);
  font-size: 0.52rem;
  color: var(--dim);
  white-space: nowrap;
  letter-spacing: 0.01em;
}

.ch-icon {
  width: 11px;
  height: 17px;
  flex-shrink: 0;
  color: var(--dim);
}

/* ── View preset buttons — pinned bottom-right ──────────── */
.view-section {
  position: absolute;
  bottom: 3.5rem;
  right: 1.2rem;
  width: 260px;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  pointer-events: auto;
}

.view-label {
  font-family: var(--mono);
  font-size: 0.58rem;
  letter-spacing: 0.1em;
  color: var(--dim);
}

.view-btns {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.3rem;
}

.vbtn {
  font-family: var(--mono);
  font-size: 0.58rem;
  letter-spacing: 0.03em;
  border: 1px solid var(--rule);
  background: transparent;
  padding: 0.22rem 0.3rem;
  cursor: pointer;
  color: var(--dim);
  transition: all 0.12s;
  text-align: center;
}

.vbtn:hover { border-color: var(--accent); color: var(--accent); }
.vbtn.active { background: var(--accent); color: #fff; border-color: var(--accent); }

/* ── SVG view controls ───────────────────────────────────── */
.view-controls {
  position: absolute;
  bottom: 3.5rem;
  right: 1.2rem;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.45rem;
  pointer-events: auto;
  /* needed for zoom-bar absolute positioning */
  isolation: isolate;
}

/* ── Zoom bar ─────────────────────────────────────────────── */
.zoom-bar {
  position: absolute;
  right: 4px;
  top: 0;
  bottom: 58px;
  width: 18px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  pointer-events: auto;
  z-index: 2;
}

.zoom-icon {
  font-family: var(--mono);
  font-size: 0.58rem;
  line-height: 1;
  color: rgba(var(--accent-r), var(--accent-g), var(--accent-b), 0.55);
  user-select: none;
}

.zoom-track {
  flex: 1;
  width: 3px;
  background: rgba(var(--accent-r), var(--accent-g), var(--accent-b), 0.15);
  border-radius: 2px;
  position: relative;
  cursor: pointer;
}

.zoom-fill {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(var(--accent-r), var(--accent-g), var(--accent-b), 0.55);
  border-radius: 2px;
  height: 50%;
}

.zoom-thumb {
  position: absolute;
  left: 50%;
  transform: translate(-50%, 50%);
  width: 9px;
  height: 9px;
  background: var(--accent);
  border-radius: 50%;
  border: 1.5px solid rgba(255,255,255,0.85);
  bottom: 50%;
  cursor: grab;
  transition: transform 0.05s, box-shadow 0.12s;
}
.zoom-thumb:active { cursor: grabbing; box-shadow: 0 0 0 3px rgba(var(--accent-r), var(--accent-g), var(--accent-b), 0.28); }

.view-presets {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.22rem;
  margin-bottom: -15px;
}

.vc-btn {
  position: relative;
  background: transparent;
  border: none;
  padding: 0;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 92px;
  height: 36px;
  transition: filter 0.15s;
}

.vc-btn-lg {
  width: 147px;
  height: 53px;
}

.vc-svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  backdrop-filter: blur(14px) saturate(160%);
  -webkit-backdrop-filter: blur(14px) saturate(160%);
}

.vc-shape {
  stroke: none;
  transition: fill 0.15s;
}

/* ── Small buttons: light glass (like homepage secondary) ── */
.vc-btn:not(.vc-btn-lg) {
  filter: drop-shadow(0 3px 10px rgba(var(--accent-r), var(--accent-g), var(--accent-b), 0.32));
}
.vc-btn:not(.vc-btn-lg) .vc-shape {
  fill: rgba(var(--accent-r), var(--accent-g), var(--accent-b), 0.10);
}
.vc-btn:not(.vc-btn-lg):hover {
  filter: drop-shadow(0 4px 14px rgba(var(--accent-r), var(--accent-g), var(--accent-b), 0.52));
}
.vc-btn:not(.vc-btn-lg):hover .vc-shape {
  fill: rgba(var(--accent-r), var(--accent-g), var(--accent-b), 0.22);
}
.vc-btn:not(.vc-btn-lg).active .vc-shape {
  fill: rgba(var(--accent-r), var(--accent-g), var(--accent-b), 0.32);
}

/* ── Large button: dark glass (like homepage primary) ── */
.vc-btn-lg {
  filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.48));
}
.vc-btn-lg .vc-shape {
  fill: rgba(0, 0, 0, 0.44);
}
.vc-btn-lg:hover {
  filter: drop-shadow(0 4px 16px rgba(var(--accent-r), var(--accent-g), var(--accent-b), 0.58));
}
.vc-btn-lg:hover .vc-shape {
  fill: rgba(var(--accent-r), var(--accent-g), var(--accent-b), 0.58);
}

.vc-label {
  position: relative;
  z-index: 1;
  font-family: var(--mono);
  font-size: 0.56rem;
  letter-spacing: 0.12em;
  transition: color 0.15s;
  pointer-events: none;
}

.vc-btn:not(.vc-btn-lg) .vc-label { color: var(--accent); }
.vc-btn-lg .vc-label { color: #fff; margin-top: 20px; }

/* ── Fig label display — pinned very bottom-right ────────── */
.cam-info pre { margin: 0 0 0.4rem; color: #666; font-size: inherit; font-family: inherit; line-height: inherit; }
.cam-info #camCopy {
  font-family: var(--mono); font-size: 0.55rem; padding: 0.15rem 0.5rem;
  background: var(--accent); color: #fff; border: none; border-radius: 3px; cursor: pointer;
}
.cam-info #camCopy:hover { opacity: 0.85; }

.cam-cluster {
  position: absolute;
  top: 50%;
  right: 1.2rem;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  pointer-events: auto;
  z-index: 25;
}

.cam-info {
  font-family: var(--mono);
  font-size: 0.6rem;
  line-height: 1.7;
  color: #888;
  letter-spacing: 0.03em;
  white-space: nowrap;
  pointer-events: auto;
}

/* ── Model rotation panel ─────────────────────────────── */
.rot-panel {
  background: rgba(255,255,255,0.88);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--rule);
  border-top: 2px solid var(--accent);
  padding: 0.45rem 0.6rem 0.5rem;
  box-shadow: 0 2px 16px rgba(0,0,0,0.06);
  min-width: 170px;
}

.rot-header {
  font-family: var(--mono);
  font-size: 0.46rem;
  letter-spacing: 0.12em;
  color: var(--dim);
  text-transform: uppercase;
  margin-bottom: 0.35rem;
  padding-bottom: 0.25rem;
  border-bottom: 1px solid var(--rule);
}

.rot-row {
  display: flex;
  align-items: center;
  gap: 0.42rem;
  margin-bottom: 0.22rem;
}

.rot-label {
  font-family: var(--mono);
  font-size: 0.55rem;
  font-weight: 600;
  color: var(--ink);
  width: 10px;
  flex-shrink: 0;
}

.rot-slider {
  flex: 1;
  height: 3px;
  -webkit-appearance: none;
  appearance: none;
  background: rgba(var(--accent-r),var(--accent-g),var(--accent-b),0.15);
  border-radius: 2px;
  cursor: pointer;
  min-width: 90px;
  outline: none;
}

.rot-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  border: 1.5px solid rgba(255,255,255,0.85);
  box-shadow: 0 1px 4px rgba(0,0,0,0.18);
  cursor: grab;
}

.rot-slider::-webkit-slider-thumb:active { cursor: grabbing; }

.rot-slider::-moz-range-thumb {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  border: 1.5px solid rgba(255,255,255,0.85);
  cursor: grab;
}

.rot-val {
  font-family: var(--mono);
  font-size: 0.5rem;
  color: var(--dim);
  width: 34px;
  text-align: right;
  flex-shrink: 0;
}

.rot-reset {
  font-family: var(--mono);
  font-size: 0.48rem;
  letter-spacing: 0.08em;
  color: var(--dim);
  border: 1px solid var(--rule);
  background: transparent;
  padding: 0.2rem 0.5rem;
  cursor: pointer;
  margin-top: 0.28rem;
  width: 100%;
  transition: border-color 0.12s, color 0.12s;
}

.rot-reset:hover { border-color: var(--accent); color: var(--accent); }

.fig-display {
  position: absolute;
  bottom: 1rem;
  right: 1.2rem;
  width: 260px;
  font-family: var(--mono);
  font-size: 0.6rem;
  color: var(--accent);
  padding-top: 0.4rem;
  border-top: 1px solid var(--rule);
  min-height: 1.4em;
  transition: color 0.2s;
  pointer-events: auto;
}

/* ── Footer ─────────────────────────────────────────────── */
.site-footer {
  display: flex;
  justify-content: space-between;
  padding: 1rem 2.5rem;
  border-top: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 0.65rem;
  color: var(--dim);
}

.site-footer a:hover { text-decoration: underline; }

/* ── Active section highlight ───────────────────────────── */
section.in-view > h2 { color: var(--ink); }

/* ── Back-to-text button (mobile: fig-ref jump) ────────── */
.back-to-text-btn {
  position: fixed;
  bottom: 1.4rem;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(18, 18, 18, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  color: #fff;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.07em;
  border: none;
  border-radius: 2rem;
  padding: 0.6rem 1.6rem;
  cursor: pointer;
  z-index: 1000;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.22s;
}

/* ── Responsive ─────────────────────────────────────────── */
@media (max-width: 768px) {

  /* ── Patent page: model on top, text below ── */
  .doc-grid {
    display: flex;
    flex-direction: column;
  }

  .model-panel {
    order: -1;
    position: relative !important;
    inset: auto !important;
    width: 100%;
    height: auto;
    display: flex;
    flex-direction: column;
    pointer-events: auto;
    z-index: 5;
    border-bottom: 2px solid var(--accent);
    background: #fafafa;
  }

  /* Model tabs: visually first via order */
  .part-tree-panel {
    order: -1;
    position: relative !important;
    top: auto !important;
    right: auto !important;
    width: 100% !important;
    max-height: none;
    border: none;
    border-top: 2px solid var(--accent);
    border-bottom: 1px solid var(--rule);
    border-radius: 0;
    box-shadow: none;
    overflow: visible;
  }
  .tree-header, .tree-list { display: none; }
  .model-tabs { border-bottom: none; flex-wrap: nowrap; }

  /* Viewer */
  .viewer-wrap {
    order: 0;
    position: relative !important;
    inset: auto !important;
    width: 100%;
    height: 44vh;
    flex-shrink: 0;
    pointer-events: auto;
  }
  .main-viewer { transform: none !important; }

  /* View presets: horizontal row */
  .view-controls {
    order: 1;
    position: relative !important;
    bottom: auto !important;
    right: auto !important;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.45rem 0.6rem;
    flex-shrink: 0;
    isolation: auto;
    background: rgba(255,255,255,0.96);
    backdrop-filter: blur(6px);
    border-top: 1px solid var(--rule);
  }
  .view-presets {
    flex-direction: row;
    gap: 0.25rem;
    margin-bottom: 0;
  }
  .vc-btn:not(.vc-btn-lg) { width: 54px; height: 22px; }
  .vc-btn-lg, .zoom-bar { display: none !important; }

  /* Fig label strip */
  .fig-display {
    order: 2;
    position: relative !important;
    bottom: auto !important;
    right: auto !important;
    width: 100% !important;
    padding: 0.3rem 1rem;
    font-size: 0.55rem;
    border-top: 1px solid var(--rule);
    background: var(--acc-bg);
    min-height: 0;
    flex-shrink: 0;
  }

  .gizmo-panel, .cam-cluster { display: none !important; }

  /* Patent body: full width, below model */
  .patent-body {
    order: 1;
    position: static !important;
    z-index: auto !important;
    pointer-events: auto !important;
  }
  .patent-intro {
    margin-left: 0;
    padding: 2rem 1.2rem 1.5rem;
    max-width: 100%;
  }
  .pi-meta-grid { grid-template-columns: 1fr; gap: 1rem; }
  .two-col {
    column-count: 1 !important;
    column-width: auto !important;
    max-width: 100%;
    margin-left: 0;
    padding: 1rem 1.2rem;
  }
  .patent-nav { padding: 0.6rem 1rem; }

  /* Back-to-text button visible when JS adds .visible */
  .back-to-text-btn.visible {
    opacity: 1;
    pointer-events: auto;
  }

  /* ── Landing: locked to viewport, SVGs nested upper-right (mobile) ── */
  .landing-body {
    height: 100vh;
    height: 100dvh;
    overflow: hidden;
  }
  .landing {
    position: relative;
    height: 100vh;
    height: 100dvh;
    padding: 1.5rem 1.4rem 1.1rem;
    gap: 0;
    min-height: 0;
    overflow: hidden;
    justify-content: flex-end;
  }

  /* Hero text + header: stacked at bottom via flex-end + order */
  .landing-hero {
    position: static;
    flex: none;
    order: 1;
    max-width: 65%;
    padding: 0;
    overflow: visible;
    justify-content: flex-start;
  }
  .landing-badge { font-size: 0.58rem; margin-bottom: 0.4rem; }
  .landing-title { font-size: clamp(1.4rem, 6vw, 2.4rem); margin-bottom: 0.5rem; }
  .landing-sub   { display: block; font-size: 0.62rem; line-height: 1.5; opacity: 0.75; max-width: 100%; }

  .landing-header {
    order: 2;
    flex-shrink: 0;
    margin-bottom: 0;
    padding-top: 0.6rem;
    padding-bottom: 0;
    gap: 0.5rem;
    flex-wrap: wrap;
  }
  .landing-logo    { font-size: 1.5rem; }
  .landing-tagline { font-size: 0.56rem; }

  .landing-footer  { display: none; }
  .landing-cam-info { display: none; }

  .landing-ctas { pointer-events: auto; }

  /* Outer wrap dissolves — each btn individually fixed like desktop */
  .cta-outer-wrap { display: contents !important; }

  /* Both buttons: fixed, right-aligned at 13px, 90vw wide */
  .cta-btn {
    position: fixed !important;
    right: 13px !important;
    width: 90vw;
    animation: none;
    pointer-events: auto;
  }

  /* Nested like desktop: secondary on top, primary arm fits into its notch.
     Primary top = 13px + secondary thin strip height (90vw × 15/534). */
  .cta-secondary { top: 13px !important;                       z-index: 2 !important; }
  .cta-primary   { top: calc(13px + 90vw * 0.0281) !important; z-index: 1 !important; }

  /* SVGs full-width — override desktop's 45vw rule */
  .cta-primary .cta-svg,
  .cta-secondary .cta-svg { width: 100% !important; height: auto; }

  /* Only label text, no description */
  .cta-desc  { display: none; }
  .cta-label { font-size: 0.78rem; }

  /* Text over right block of each L-shape — override desktop calc() */
  .cta-primary .cta-text {
    left: 57% !important;
    right: 2% !important;
    top: 70% !important;
    bottom: 2% !important;
  }
  .cta-secondary .cta-text {
    left: 57% !important;
    right: 2% !important;
    top: 12% !important;
    bottom: 12% !important;
  }

  /* Suppress desktop line decorations */
  .cta-primary::before, .cta-secondary::before { display: none; }
}

/* ════════════════════════════════════════════════════════
   LANDING PAGE
════════════════════════════════════════════════════════ */
.landing-body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.landing {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  padding: 3rem 4rem 3rem 5.5rem;
  gap: 0;
  position: relative;
  z-index: 1;
  pointer-events: none;
}

/* Re-enable on specific interactive elements */
.landing-logo-link,
.landing-header-right,
.landing-hero-text,
.landing-footer,
.landing-cam-info {
  pointer-events: auto;
}

/* CTA hitbox: only the L-shaped SVG path, not the full bounding box */
.cta-hitarea { pointer-events: all; }
.cta-text    { pointer-events: none; }

.landing-header {
  display: flex;
  align-items: baseline;
  gap: 1.5rem;
  margin-bottom: auto;
  padding-bottom: 2rem;
}

.landing-logo {
  font-family: var(--mono);
  font-size: 2.8rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--ink);
  position: relative;
  animation: l-fade-in 0.65s cubic-bezier(0.16, 1, 0.3, 1) both;
}
.landing-logo::after {
  content: '';
  position: absolute;
  left: 0; bottom: -3px;
  width: 100%; height: 1.5px;
  background: var(--accent);
  transform-origin: left;
  animation: l-logo-bar 1.5s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.landing-logo-link {
  text-decoration: none;
  color: var(--ink);
}

.landing-logo-link:hover { color: var(--accent); }

.landing-tagline {
  font-family: var(--mono);
  font-size: 0.65rem;
  color: var(--dim);
  letter-spacing: 0.06em;
  animation: l-fade-in 0.6s 0.28s ease both;
}

.landing-hero {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  max-width: 480px;
  padding: 4rem 0;
}

.landing-badge {
  font-family: var(--mono);
  font-size: 0.65rem;
  color: var(--dim);
  letter-spacing: 0.08em;
  margin-bottom: 1.2rem;
  animation: l-rise 0.7s 0.45s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.landing-title {
  font-family: 'Inter', sans-serif;
  font-size: clamp(2.2rem, 5.5vw, 4.4rem);
  font-weight: 600;
  line-height: 1.06;
  letter-spacing: -0.03em;
  color: var(--ink);
  margin-bottom: 1.6rem;
  animation: l-rise 0.9s 0.6s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.landing-sub {
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.75;
  color: #666;
  max-width: 480px;
  margin-bottom: 3rem;
  animation: l-fade-in 0.9s 0.92s ease both;
}

.landing-ctas {
  position: static;
}

.cta-outer-wrap {
  display: contents;
}

@keyframes line-extend-left {
  from { clip-path: inset(0 0 0 100%); }
  to   { clip-path: inset(0 0 0 0%); }
}

.cta-btn {
  position: fixed;
  right: 30px;
  display: block;
  text-decoration: none;
  color: inherit;
}

/* Horizontal lines shooting left from each button's arm endcap */
.cta-primary::before,
.cta-secondary::before {
  content: '';
  position: absolute;
  right: 100%;
  height: 1px;
  width: 29vw;
  pointer-events: none;
  clip-path: inset(0 0 0 100%);
  animation: line-extend-left 2.2s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.cta-primary::before {
  top: 2.16%;
  background: linear-gradient(to left,
    rgba(var(--accent-r), var(--accent-g), var(--accent-b), 0.55) 0%,
    rgba(var(--accent-r), var(--accent-g), var(--accent-b), 0.18) 55%,
    transparent 100%);
  animation-delay: 0.4s;
}

.cta-secondary::before {
  top: 3.26%;
  background: linear-gradient(to left,
    rgba(var(--accent-r), var(--accent-g), var(--accent-b), 0.45) 0%,
    rgba(var(--accent-r), var(--accent-g), var(--accent-b), 0.12) 55%,
    transparent 100%);
  animation-delay: 0.15s;
}

/* Glass fill — SVG path fill, cross-browser (replaces foreignObject+clipPath which breaks in Safari) */
.cta-svg {
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
}

.cta-fill {
  transition: fill 0.25s;
}

.cta-primary .cta-fill          { fill: rgba(0, 0, 0, 0.44); }
.cta-primary.hovered .cta-fill  { fill: rgba(var(--accent-r), var(--accent-g), var(--accent-b), 0.58); }

.cta-secondary .cta-fill        { fill: rgba(var(--accent-r), var(--accent-g), var(--accent-b), 0.10); }
.cta-secondary.hovered .cta-fill { fill: rgba(var(--accent-r), var(--accent-g), var(--accent-b), 0.20); }

.cta-svg {
  display: block;
  height: auto;
}

/* ── Primary (Development Updates): dark glass ── */
.cta-primary {
  top: 62px;
  z-index: 1;
  animation: l-fade-in 0.8s 0.72s ease both;
}
.cta-primary .cta-svg { width: 45vw; }

.cta-primary .cta-path {
  fill: none;
  stroke: none;
}
.cta-primary         { filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.50)); }
.cta-primary.hovered { filter: drop-shadow(0 4px 16px rgba(var(--accent-r), var(--accent-g), var(--accent-b), 0.60)); }

/* ── Secondary (Patent & 3D Model): light glass ── */
.cta-secondary {
  top: 30px;
  z-index: 2;
  animation: l-fade-in 0.8s 0.52s ease both;
}
.cta-secondary .cta-svg { width: 45vw; }

.cta-secondary .cta-path {
  fill: none;
  stroke: none;
}

.cta-secondary .cta-path-draw {
  fill: none;
  stroke: var(--accent);
  stroke-width: 0.5;
  stroke-linecap: round;
  pointer-events: none;
}

.cta-hitarea { cursor: pointer; }

.cta-secondary         { filter: drop-shadow(0 4px 14px rgba(var(--accent-r), var(--accent-g), var(--accent-b), 0.42)) drop-shadow(0 1px 3px rgba(var(--accent-r), var(--accent-g), var(--accent-b), 0.22)); }
.cta-secondary.hovered { filter: drop-shadow(0 5px 18px rgba(var(--accent-r), var(--accent-g), var(--accent-b), 0.58)) drop-shadow(0 1px 4px rgba(var(--accent-r), var(--accent-g), var(--accent-b), 0.28)); }

/* ── Text overlays ── */
.cta-text {
  position: absolute;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.35rem;
  pointer-events: none;
}

/* Primary text: lower block area, below secondary overlap (~57%) and notch (~68%) */
.cta-primary .cta-text {
  left: calc(58% + 50px);
  right: 3%;
  top: 70%;
  bottom: 3%;
  color: #fff;
}

/* Secondary text: in its block area (block starts ~57% across Vector 2) */
.cta-secondary .cta-text {
  left: calc(58% + 50px);
  right: 3%;
  top: 10%;
  bottom: 10%;
  color: var(--ink);
  transition: color 0.16s;
}
.cta-secondary.hovered .cta-text { color: var(--accent); }

.cta-label {
  font-family: 'Inter', sans-serif;
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.cta-desc {
  font-family: var(--mono);
  font-size: 0.72rem;
  font-style: normal;
  line-height: 1.4;
  opacity: 0.72;
}

.landing-footer {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding-top: 2rem;
  border-top: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 0.62rem;
  color: var(--dim);
  margin-top: auto;
  animation: l-fade-in 0.7s 1.15s ease both;
}

.landing-footer a { color: var(--dim); }
.landing-footer a:hover { color: var(--accent); text-decoration: underline; }

/* ── Landing 3D model background ──────────────────────── */
.landing-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: auto;
}
.landing-viewer {
  width: 100%;
  height: 100%;
  background: transparent !important;
  --poster-color: transparent !important;
  filter: drop-shadow(0 20px 60px rgba(29,78,216,0.2)) drop-shadow(0 4px 18px rgba(29,78,216,0.10));
}

/* ── Landing header right (tagline + swatches) ─────────── */
.landing-header-right {
  display: flex;
  align-items: center;
  gap: 1.4rem;
}
.landing-scheme-row {
  display: flex;
  gap: 7px;
  align-items: center;
  animation: l-fade-in 0.6s 0.42s ease both;
}
.l-swatch {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  border: none;
  cursor: pointer;
  opacity: 0.45;
  transition: opacity 0.18s, transform 0.18s, box-shadow 0.18s;
  padding: 0;
  flex-shrink: 0;
}
.l-swatch.active {
  opacity: 1;
  transform: scale(1.3);
  box-shadow: 0 0 0 2px rgba(0,0,0,0.08), 0 0 0 3px var(--accent);
}
.l-swatch:hover:not(.active) { opacity: 0.8; transform: scale(1.1); }

/* ── Landing camera readout ────────────────────────────── */
.landing-cam-info {
  position: fixed;
  bottom: 1.4rem;
  left: 1.6rem;
  font-family: var(--mono);
  font-size: 0.58rem;
  line-height: 1.7;
  color: #888;
  letter-spacing: 0.03em;
  white-space: nowrap;
  pointer-events: auto;
  z-index: 50;
}
.landing-cam-info pre { margin: 0 0 0.35rem; font-family: inherit; font-size: inherit; }
#landingCamCopy {
  font-family: var(--mono); font-size: 0.55rem; padding: 0.15rem 0.5rem;
  background: var(--accent); color: #fff; border: none;
  border-radius: 3px; cursor: pointer;
}
#landingCamCopy:hover { opacity: 0.85; }

/* ── Landing load animations ───────────────────────────── */
@keyframes l-fade-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}
@keyframes l-rise {
  from { opacity: 0; transform: translateY(9px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes l-logo-bar {
  0%   { transform: scaleX(0); opacity: 1; }
  58%  { transform: scaleX(1); opacity: 1; }
  82%  { transform: scaleX(1); opacity: 0.7; }
  100% { transform: scaleX(1); opacity: 0; }
}

/* ── Color scheme swatches ───────────────────────────── */
.scheme-row {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.38rem 0.65rem;
  border-bottom: 1px solid var(--rule);
  background: var(--acc-bg);
}

.scheme-label {
  font-family: var(--mono);
  font-size: 0.49rem;
  letter-spacing: 0.1em;
  color: var(--dim);
  margin-right: 0.15rem;
  user-select: none;
}

.scheme-divider {
  width: 1px;
  height: 10px;
  background: var(--rule);
  margin: 0 0.45rem;
  flex-shrink: 0;
}

.scheme-exp-label {
  opacity: 0.55;
  font-style: italic;
}

.swatch {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  border: 1.5px solid rgba(0,0,0,0.12);
  cursor: pointer;
  padding: 0;
  flex-shrink: 0;
  transition: transform 0.12s, box-shadow 0.12s;
}

.swatch:hover { transform: scale(1.25); }

.swatch.active {
  box-shadow: 0 0 0 2px #fff, 0 0 0 3.5px currentColor;
}

@keyframes aurora-spin { to { filter: hue-rotate(360deg); } }

.swatch-aurora {
  background: conic-gradient(
    #1d4ed8, #0d9488, #16a34a, #d97706, #c2410c, #e11d48, #7c3aed, #1d4ed8
  );
  border-color: transparent;
  animation: aurora-spin 4s linear infinite;
}

.swatch-aurora.active {
  box-shadow: 0 0 0 2px #fff, 0 0 0 3.5px rgba(120,120,120,0.6);
}

/* ── Part tree ───────────────────────────────────────── */
.tree-header {
  padding: 0.35rem 0.65rem;
  font-family: var(--mono);
  font-size: 0.52rem;
  letter-spacing: 0.12em;
  color: var(--dim);
  border-bottom: 1px solid var(--rule);
  background: var(--acc-bg);
}

.tree-list,
.tree-children {
  list-style: none;
  padding: 0;
  margin: 0;
}

.tree-list { padding: 0.2rem 0; }

.tree-row {
  display: flex;
  align-items: center;
  gap: 0.28rem;
  padding: 0.22rem 0.6rem;
  cursor: pointer;
  font-family: var(--mono);
  font-size: 0.58rem;
  color: var(--ink);
  transition: background 0.1s, color 0.1s;
  white-space: nowrap;
  overflow: hidden;
}

.tree-row:hover  { background: var(--acc-bg); color: var(--accent); }
.tree-row.active {
  background: rgba(29,78,216,0.12);
  color: var(--accent);
  font-weight: 600;
  border-left: 2px solid var(--accent);
  padding-left: calc(0.6rem - 2px);
}

.tree-toggle, .tree-dot {
  font-size: 0.48rem;
  width: 10px;
  flex-shrink: 0;
  color: var(--dim);
  user-select: none;
}

.tree-name { flex: 1; overflow: hidden; text-overflow: ellipsis; }

.tree-rn {
  font-size: 0.5rem;
  color: var(--accent);
  background: var(--acc-bg);
  padding: 0.05rem 0.22rem;
  border-radius: 2px;
  flex-shrink: 0;
}

.tree-vis-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-left: 0.3rem;
  padding: 2px;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--dim);
  flex-shrink: 0;
  border-radius: 2px;
  opacity: 0.7;
  transition: opacity 0.15s, color 0.15s;
}
.tree-vis-btn:hover { opacity: 1; color: var(--accent); }
.tree-vis-btn.vis-hidden { opacity: 0.3; color: var(--dim); }
.tree-vis-btn.vis-hidden svg ellipse { stroke-dasharray: 3 2; }

/* Depth indentation */
.tree-children > .tree-item > .tree-row          { padding-left: 1.4rem; }
.tree-children > .tree-item > .tree-children
  > .tree-item > .tree-row                       { padding-left: 2.2rem; }
.tree-children > .tree-item > .tree-children
  > .tree-item > .tree-children > .tree-item
  > .tree-row                                    { padding-left: 3rem; }
.tree-children > .tree-item > .tree-children
  > .tree-item > .tree-children > .tree-item
  > .tree-children > .tree-item > .tree-row      { padding-left: 3.8rem; }

/* ── Patent page top nav ──────────────────────────────── */
.patent-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.2rem;
  padding: 0.7rem 2.5rem;
  border-bottom: 1px solid var(--rule);
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 100;
  box-shadow: 0 2px 0 var(--acc-bg), 0 1px 14px rgba(0,0,0,0.04);
}

.patent-nav-swatches {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: auto;
}

body.patent-page {
  padding-top: 2.6rem;
}

.patent-nav-back {
  font-family: var(--mono);
  font-size: 0.65rem;
  color: var(--dim);
  text-decoration: none;
  letter-spacing: 0.04em;
  transition: color 0.12s;
}

.patent-nav-back:hover { color: var(--accent); }

.patent-nav-id {
  font-family: var(--mono);
  font-size: 0.65rem;
  color: var(--dim);
}

@media (max-width: 480px) {
  .landing { padding: 1.2rem 1rem 0.9rem; }
  .landing-title { font-size: clamp(1.35rem, 8vw, 2rem); }
  .cta-label { font-size: 0.72rem; }
  .cta-desc  { font-size: 0.55rem; }
  .pi-inventor-name { font-size: 2.8rem; }
  .pi-title-text { font-size: 1.1rem; }
}

/* ══════════════════════════════════════════════════════════
   PROGRESS PAGE
   ══════════════════════════════════════════════════════════ */

.prog-outer {
  background: var(--bg);
  min-height: 100vh;
}

/* ── Top nav ──────────────────────────────────────────── */
.prog-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 52px;
  z-index: 200;
  display: flex;
  align-items: center;
  gap: 1.2rem;
  padding: 0 2rem;
  background: rgba(255,255,255,0.94);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--rule);
}

.prog-nav-logo {
  font-family: var(--mono);
  font-size: 1.05rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--ink);
  text-decoration: none;
  flex-shrink: 0;
}

.prog-nav-title {
  font-family: var(--mono);
  font-size: 0.65rem;
  color: var(--dim);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.prog-nav-link {
  margin-left: auto;
  font-family: var(--mono);
  font-size: 0.65rem;
  color: var(--dim);
  letter-spacing: 0.04em;
  text-decoration: none;
  transition: color 0.14s;
}
.prog-nav-link:hover { color: var(--accent); text-decoration: none; }

/* ── Timeline strip ───────────────────────────────────── */
.prog-strip {
  position: fixed;
  top: 52px; left: 0; right: 0;
  height: 52px;
  z-index: 190;
  background: rgba(255,255,255,0.97);
  border-bottom: 1px solid var(--rule);
  display: flex;
  align-items: center;
  padding: 0 2rem;
}

.prog-strip-track {
  position: relative;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.prog-strip-track::before {
  content: '';
  position: absolute;
  top: 50%; left: 0; right: 0;
  height: 1px;
  background: var(--rule);
  transform: translateY(-50%);
  z-index: 0;
}

.prog-strip-fill {
  position: absolute;
  top: 50%; left: 0;
  height: 2px;
  width: 0%;
  background: var(--accent);
  transform: translateY(-50%);
  z-index: 1;
  transition: width 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── Phase nodes in strip ─────────────────────────────── */
.prog-node {
  position: relative;
  z-index: 2;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
}

.prog-node-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--rule);
  border: 2px solid var(--bg);
  box-shadow: 0 0 0 1.5px var(--rule);
  transition: background 0.3s, box-shadow 0.3s;
}

.prog-node[data-active="true"] .prog-node-dot {
  background: var(--accent);
  box-shadow: 0 0 0 1.5px var(--accent);
}

.prog-node-label {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1px;
  pointer-events: none;
}

.prog-node-date {
  font-family: var(--mono);
  font-size: 0.52rem;
  color: var(--dim);
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.prog-node-name {
  font-family: var(--mono);
  font-size: 0.58rem;
  color: var(--ink);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  white-space: nowrap;
  transition: color 0.2s;
}

.prog-node[data-active="true"] .prog-node-name { color: var(--accent); }
.prog-node:hover .prog-node-name { color: var(--accent); }

/* ── Main layout ──────────────────────────────────────── */
.prog-main {
  display: flex;
  padding-top: 104px; /* nav + strip */
  min-height: calc(100vh - 104px);
}

/* ── Skeleton column (sticky left) ───────────────────── */
.prog-skel-col {
  width: 38%;
  flex-shrink: 0;
  position: sticky;
  top: 104px;
  height: calc(100vh - 104px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1.5rem 1rem 1rem;
  border-right: 1px solid var(--rule);
  overflow: hidden;
}

.prog-skel-wrap {
  flex: 1;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.prog-skel-wrap svg {
  max-height: calc(100vh - 180px);
  max-width: 100%;
  flex-shrink: 0;
}

/* SVG path default stroke override */
.prog-skel-wrap svg path,
.prog-skel-wrap svg circle,
.prog-skel-wrap svg line,
.prog-skel-wrap svg polyline,
.prog-skel-wrap svg ellipse {
  stroke: var(--ink);
  fill: none;
}

/* Active layer accent color */
.prog-skel-wrap svg #head path,
.prog-skel-wrap svg #ui   path,
.prog-skel-wrap svg #ui   circle,
.prog-skel-wrap svg #ui   line { stroke-width: 1.1; }

.prog-skel-caption {
  width: 100%;
  padding: 0.6rem 0.5rem 0.25rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
}

.prog-skel-layer {
  font-family: var(--mono);
  font-size: 0.6rem;
  color: var(--accent);
  letter-spacing: 0.06em;
  text-align: center;
  min-height: 1em;
  transition: color 0.3s;
}

.prog-skel-hint {
  font-family: var(--mono);
  font-size: 0.52rem;
  color: var(--dim);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* Hide hint once phase > 0 */
.prog-skel-caption[data-phase]:not([data-phase="0"]) .prog-skel-hint {
  opacity: 0;
}

/* ── Events column (right, scrollable) ────────────────── */
.prog-events-col {
  flex: 1;
  padding: 3rem 3.5rem 5rem 3.5rem;
  max-width: 680px;
}

/* ── Phase section ────────────────────────────────────── */
.prog-phase {
  display: flex;
  gap: 1.6rem;
  padding-bottom: 5rem;
  min-height: 80vh;
}

.prog-phase-last {
  min-height: auto;
  padding-bottom: 3rem;
}

/* Spine (vertical line + dot on left) */
.prog-phase-spine {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex-shrink: 0;
  width: 16px;
  padding-top: 0.3rem;
}

.prog-phase-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2px solid var(--accent);
  background: var(--bg);
  flex-shrink: 0;
  transition: background 0.4s;
}

.prog-phase-dot-granted {
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(var(--accent-r), var(--accent-g), var(--accent-b), 0.14);
}

.prog-phase-line {
  flex: 1;
  width: 1px;
  background: var(--rule);
  margin-top: 6px;
}

/* Phase content */
.prog-phase-content {
  flex: 1;
  min-width: 0;
}

/* Phase header */
.prog-phase-head {
  margin-bottom: 1.6rem;
}

.prog-phase-mono {
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--accent);
  letter-spacing: 0.08em;
  display: block;
  margin-bottom: 0.35rem;
}

.prog-phase-title {
  font-family: var(--serif);
  font-size: 1.9rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin-bottom: 0.45rem;
}

.prog-phase-sub {
  font-family: var(--serif);
  font-size: 0.95rem;
  color: var(--dim);
  line-height: 1.5;
}

/* ── Expandable block ─────────────────────────────────── */
.prog-block {
  border: 1px solid var(--rule);
  border-radius: 6px;
  margin-bottom: 0.8rem;
  overflow: hidden;
  transition: border-color 0.2s;
}

.prog-block:hover { border-color: rgba(var(--accent-r), var(--accent-g), var(--accent-b), 0.35); }

.prog-block-granted {
  border-color: rgba(var(--accent-r), var(--accent-g), var(--accent-b), 0.4);
  background: rgba(var(--accent-r), var(--accent-g), var(--accent-b), 0.025);
}

.prog-block-trigger {
  width: 100%;
  padding: 0.9rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  font-family: var(--serif);
}

.prog-block-title {
  flex: 1;
  font-size: 0.98rem;
  font-weight: 500;
  color: var(--ink);
}

.prog-block-icon {
  width: 14px;
  height: 14px;
  color: var(--dim);
  flex-shrink: 0;
  transition: transform 0.28s cubic-bezier(0.4, 0, 0.2, 1), color 0.2s;
}

.prog-block-trigger.is-open .prog-block-icon {
  transform: rotate(180deg);
  color: var(--accent);
}

/* Block body — collapsed by default */
.prog-block-body {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  border-top: 1px solid transparent;
}

.prog-block[data-expanded="true"] .prog-block-body {
  border-top-color: var(--rule);
}

/* ── Infographic content ──────────────────────────────── */
.prog-infographic {
  padding: 1.1rem 1rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* Stat row */
.prog-stat-row {
  display: flex;
  align-items: stretch;
  gap: 0;
  border: 1px solid var(--rule);
  border-radius: 5px;
  overflow: hidden;
}

.prog-stat {
  flex: 1;
  padding: 0.75rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.prog-stat-val {
  font-family: var(--mono);
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.prog-stat-val.mono { font-size: 0.82rem; }

.prog-stat-lbl {
  font-family: var(--serif);
  font-size: 0.72rem;
  color: var(--dim);
}

.prog-stat-divider {
  width: 1px;
  background: var(--rule);
  flex-shrink: 0;
}

/* Diagram / parts grid */
.prog-diagram {
  border: 1px solid var(--rule);
  border-radius: 5px;
  overflow: hidden;
}

.prog-diagram-label {
  font-family: var(--mono);
  font-size: 0.58rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--dim);
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--rule);
  background: rgba(0,0,0,0.015);
}

.prog-parts-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
}

.prog-part {
  padding: 0.5rem 0.75rem;
  font-family: var(--serif);
  font-size: 0.82rem;
  color: var(--ink);
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}

.prog-part:nth-child(3n) { border-right: none; }
.prog-part:nth-last-child(-n+3) { border-bottom: none; }

.prog-part-num {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--accent);
  flex-shrink: 0;
}

/* Goals list */
.prog-goal-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.prog-goal-list li {
  font-family: var(--serif);
  font-size: 0.9rem;
  color: var(--ink);
  padding-left: 1.1rem;
  position: relative;
}

.prog-goal-list li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.75rem;
}

/* Quote block */
.prog-quote {
  border-left: 2px solid var(--accent);
  padding: 0.5rem 1rem;
  background: var(--acc-bg);
  border-radius: 0 4px 4px 0;
}

.prog-quote p {
  font-family: var(--serif);
  font-style: italic;
  font-size: 0.92rem;
  color: var(--ink);
  line-height: 1.5;
}

/* Mini timeline */
.prog-timeline-mini {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.prog-tmi-row {
  display: flex;
  align-items: center;
  gap: 0.7rem;
}

.prog-tmi-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  border: 1.5px solid var(--rule);
  flex-shrink: 0;
}

.prog-tmi-filled {
  background: var(--accent);
  border-color: var(--accent);
}

.prog-tmi-label {
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--ink);
  letter-spacing: 0.02em;
}

.prog-tmi-future { color: var(--dim); }

/* Note text */
.prog-block-note {
  font-family: var(--serif);
  font-size: 0.84rem;
  color: var(--dim);
  line-height: 1.55;
}

/* External link */
.prog-ext-link {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.65rem;
  color: var(--accent);
  letter-spacing: 0.04em;
  border-bottom: 1px solid rgba(var(--accent-r), var(--accent-g), var(--accent-b), 0.3);
  text-decoration: none;
  transition: border-color 0.15s;
}

.prog-ext-link:hover {
  border-bottom-color: var(--accent);
  text-decoration: none;
}

/* IPC block */
.prog-ipc-block {
  border: 1px solid var(--rule);
  border-radius: 5px;
  overflow: hidden;
}

.prog-ipc-label {
  font-family: var(--mono);
  font-size: 0.58rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--dim);
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--rule);
  background: rgba(0,0,0,0.015);
}

.prog-ipc-row {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding: 0.45rem 0.75rem;
  border-bottom: 1px solid var(--rule);
}

.prog-ipc-row:last-child { border-bottom: none; }

.prog-ipc-code {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--accent);
  letter-spacing: 0.02em;
  flex-shrink: 0;
}

.prog-ipc-desc {
  font-family: var(--serif);
  font-size: 0.82rem;
  color: var(--dim);
}

/* Grant names */
.prog-grant-names {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.prog-grant-names div {
  font-family: var(--serif);
  font-size: 0.88rem;
  color: var(--ink);
  display: flex;
  gap: 0.6rem;
}

.prog-dim {
  font-family: var(--mono);
  font-size: 0.62rem;
  color: var(--dim);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  min-width: 4.5rem;
  padding-top: 0.1rem;
  flex-shrink: 0;
}

/* Roadmap */
.prog-roadmap {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.prog-rm-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--serif);
  font-size: 0.88rem;
  color: var(--ink);
}

.prog-rm-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
  background: var(--accent);
}

.prog-rm-open {
  background: none;
  border: 1.5px solid var(--rule);
}

.prog-rm-done { color: var(--ink); font-weight: 500; }

/* ── Footer ───────────────────────────────────────────── */
.prog-footer {
  border-top: 1px solid var(--rule);
  padding: 1.2rem 3.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 0.6rem;
  color: var(--dim);
  letter-spacing: 0.04em;
}

.prog-footer-links {
  display: flex;
  gap: 1.5rem;
}

.prog-footer-links a {
  color: var(--dim);
  text-decoration: none;
  transition: color 0.14s;
}

.prog-footer-links a:hover { color: var(--accent); }

/* ── Responsive ───────────────────────────────────────── */
@media (max-width: 860px) {
  .prog-main { flex-direction: column; }
  .prog-skel-col {
    position: relative;
    top: auto;
    height: 50vw;
    max-height: 340px;
    width: 100%;
    border-right: none;
    border-bottom: 1px solid var(--rule);
  }
  .prog-events-col { padding: 2rem 1.5rem 3rem; }
  .prog-phase { min-height: auto; }
  .prog-node-name { display: none; }
  .prog-footer { flex-direction: column; gap: 0.5rem; padding: 1rem; }
}