/* Joga Neck page. Builds on ../static/css/index.css (tokens, glass panes,
   eyebrow, titles, metric cards, results tables) and only adds what this
   page needs. */

/* Top capsule: same smoked glass as the main page's resource capsule. */
.neck-nav {
  left: 0;
  position: fixed;
  right: 0;
  top: calc(14px + env(safe-area-inset-top));
  z-index: 40;
}

.neck-nav ul {
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  background: var(--glass-dark);
  border: 1px solid var(--glass-dark-edge);
  border-radius: 999px;
  box-shadow: var(--glass-dark-shadow);
  display: flex;
  font-size: 0.95rem;
  gap: 2px;
  list-style: none;
  margin: 0 auto;
  padding: 3px;
  width: max-content;
}

.neck-nav a {
  align-items: center;
  border-radius: 999px;
  color: #fff;
  display: flex;
  font-family: 'Google Sans', sans-serif;
  gap: 0.45rem;
  padding: 0.35rem 0.95rem;
}

.neck-nav a:hover,
.neck-nav a:focus-visible {
  background: rgba(255, 255, 255, 0.2);
  color: #fff;
}

/* Hero pane */
main > .section.neck-hero {
  padding-top: 5.5rem;
}

.neck-hero-grid {
  align-items: center;
  display: grid;
  gap: 2.5rem;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
}

.neck-title {
  color: var(--joga);
  font-family: 'Google Sans', sans-serif;
  font-size: clamp(3rem, 7vw, 5.25rem);
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 0.95;
  margin-bottom: 1rem;
}

.neck-subtitle {
  color: var(--ink);
  font-family: 'Google Sans', sans-serif;
  font-size: clamp(1.25rem, 2.2vw, 1.6rem);
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: 1.25rem;
}

.neck-hero-figure.neck-viewer {
  aspect-ratio: 4 / 5;
  margin: 0;
  max-height: 540px;
  width: 100%;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.75rem;
}

.pill-button {
  align-items: center;
  border-radius: 999px;
  display: inline-flex;
  font-family: 'Google Sans', sans-serif;
  font-weight: 700;
  gap: 0.5rem;
  padding: 0.6rem 1.25rem;
  transition: transform 0.15s ease, background 0.15s ease;
}

.pill-button:hover,
.pill-button:focus-visible {
  transform: scale(1.03);
}

.pill-button--primary {
  background: var(--glass-sheen), #8c0018;
  border: 1px solid rgba(255, 255, 255, 0.6);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.5), 0 10px 28px rgba(117, 0, 20, 0.22);
  color: #fff;
}

.pill-button--primary:hover,
.pill-button--primary:focus-visible {
  background: var(--glass-sheen), #a3001c;
  color: #fff;
}

.pill-button--glass {
  background: var(--glass-inner);
  border: 1px solid var(--glass-edge);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.8);
  color: var(--ink);
}

.pill-button--glass:hover,
.pill-button--glass:focus-visible {
  background: rgba(255, 255, 255, 0.85);
  color: var(--ink);
}

/* Section tabs inside the hero pane */
.section-tabs {
  border-top: 1px solid var(--glass-line);
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  list-style: none;
  margin: 2.5rem 0 0;
  padding: 1.5rem 0 0;
}

.section-tabs a {
  border: 1px solid var(--glass-edge);
  border-radius: 999px;
  color: var(--ink);
  display: inline-block;
  font-family: 'Google Sans', sans-serif;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.3rem 0.9rem;
}

.section-tabs a:hover,
.section-tabs a:focus-visible {
  background: rgba(255, 255, 255, 0.85);
  color: var(--ink);
}

/* Four spec cards in a row */
.metric-grid--four {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin: 2.5rem auto 0;
  max-width: none;
}

.metric-grid--four .metric-card {
  border-top: 1px solid var(--glass-edge);
}

.metric-grid--four .metric-value {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
}

/* Spec and parts tables: full width, cells may wrap */
.neck-table {
  margin: 1.5rem 0 0;
}

.neck-table th,
.neck-table td {
  vertical-align: top;
  white-space: normal;
}

.neck-table td:first-child {
  white-space: nowrap;
}

.neck-table .num {
  text-align: right;
  white-space: nowrap;
}

.table-scroll {
  overflow-x: auto;
  padding: 0 2px 2px;
}

/* Build steps: image beside text, alternating */
.build-steps {
  display: grid;
  gap: 1.25rem;
  list-style: none;
  margin: 2.5rem 0 0;
  padding: 0;
}

.build-step {
  align-items: center;
  background: var(--glass-inner);
  border: 1px solid var(--glass-edge);
  border-radius: 18px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.8);
  display: grid;
  gap: 1.5rem;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  padding: 1.5rem;
}

.build-step:nth-child(even) .build-step-figure {
  order: 2;
}

.build-step-figure {
  margin: 0;
}

.build-step-figure img {
  display: block;
  height: auto;
  margin: 0 auto;
  max-height: 340px;
  object-fit: contain;
  width: 100%;
}

.build-step-head {
  align-items: center;
  display: flex;
  gap: 0.75rem;
  margin-bottom: 0.6rem;
}

.build-step-head .step-number {
  background: var(--accent);
}

.build-step h3 {
  color: var(--ink);
  font-family: 'Google Sans', sans-serif;
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.3;
}

.build-step p {
  color: #45515e;
  font-size: 0.95rem;
  line-height: 1.6;
}

.build-step p + p {
  margin-top: 0.6rem;
}

.fastener {
  background: rgba(225, 129, 76, 0.14);
  border-radius: 6px;
  color: var(--ink);
  font-weight: 700;
  padding: 0 0.3rem;
  white-space: nowrap;
}

.legend-note {
  color: var(--muted);
  font-size: 0.9rem;
  margin-top: 1rem;
}

.legend-swatch {
  background: #d9480f;
  border-radius: 3px;
  display: inline-block;
  height: 0.8rem;
  margin: 0 0.25rem -0.05rem 0;
  width: 0.8rem;
}

/* Unitree version card */
.variant-card {
  align-items: center;
  background: var(--glass-inner);
  border: 1px solid var(--glass-edge);
  border-radius: 18px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.8);
  display: grid;
  gap: 1.5rem;
  grid-template-columns: 180px minmax(0, 1fr);
  margin-top: 2rem;
  padding: 1.25rem 1.5rem;
}

.variant-figure img {
  border-radius: 12px;
  display: block;
  height: auto;
  width: 100%;
}

.variant-card h3 {
  color: var(--ink);
  font-family: 'Google Sans', sans-serif;
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
}

.variant-card p {
  color: #45515e;
  font-size: 0.95rem;
  line-height: 1.6;
}

.variant-card .button-row {
  margin-top: 0.9rem;
}

/* Mount section: photo beside the steps */
.mount-grid {
  align-items: start;
  display: grid;
  gap: 2rem;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  margin-top: 2rem;
}

.mount-figure {
  margin: 0;
}

.mount-figure img {
  border-radius: 18px;
  box-shadow: 0 14px 40px rgba(20, 35, 50, 0.16);
  display: block;
  height: auto;
  width: 100%;
}

.mount-figure figcaption {
  color: var(--muted);
  font-size: 0.85rem;
  margin-top: 0.6rem;
  text-align: center;
}

.numbered {
  counter-reset: numbered;
  list-style: none;
  margin: 0;
  padding: 0;
}

.numbered li {
  counter-increment: numbered;
  margin: 0 0 1rem;
  padding-left: 2.6rem;
  position: relative;
}

.numbered li::before {
  align-items: center;
  background: var(--sage);
  border-radius: 50%;
  color: var(--ink);
  content: counter(numbered);
  display: inline-flex;
  font-family: 'Google Sans', sans-serif;
  font-size: 0.85rem;
  font-weight: 800;
  height: 1.8rem;
  justify-content: center;
  left: 0;
  position: absolute;
  top: 0;
  width: 1.8rem;
}

.numbered li strong {
  color: var(--ink);
}

.numbered li p,
.numbered li {
  color: #45515e;
}

.screw-red {
  color: var(--red);
}

.screw-blue {
  color: #2f6fd6;
}

/* Wiring flow */
.flow {
  display: grid;
  gap: 1rem;
  margin: 2rem 0 0;
}

.flow-row {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.flow-label {
  color: var(--muted);
  flex: 0 0 100%;
  font-family: 'Google Sans', sans-serif;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.flow-node {
  background: var(--glass-inner);
  border: 1px solid var(--glass-edge);
  border-radius: 14px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.8);
  color: var(--ink);
  font-family: 'Google Sans', sans-serif;
  font-size: 0.92rem;
  font-weight: 700;
  line-height: 1.25;
  padding: 0.6rem 0.9rem;
}

.flow-arrow {
  color: var(--muted);
  font-family: 'Google Sans', sans-serif;
  font-size: 0.78rem;
  font-weight: 700;
  text-align: center;
}

.flow-arrow::after {
  content: ' \2192';
  font-size: 1.1rem;
}

/* File cards */
.file-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 2rem;
}

.file-card {
  background: var(--glass-inner);
  border: 1px solid var(--glass-edge);
  border-radius: 18px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.8);
  color: var(--ink);
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 1.25rem;
  transition: transform 0.15s ease, background 0.15s ease;
}

.file-card:hover,
.file-card:focus-visible {
  background: rgba(255, 255, 255, 0.85);
  color: var(--ink);
  transform: translateY(-2px);
}

.file-card .icon {
  color: var(--accent-dark);
  font-size: 1.3rem;
  height: auto;
  justify-content: flex-start;
  width: auto;
}

.file-card strong {
  font-family: 'Google Sans', sans-serif;
  font-size: 1.05rem;
}

.file-card span {
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.45;
}

/* Citation */
.bibtex {
  background: rgba(16, 24, 32, 0.88);
  border-radius: 14px;
  color: #e8edf2;
  font-size: 0.82rem;
  line-height: 1.55;
  margin-top: 1rem;
  overflow-x: auto;
  padding: 1.25rem 1.5rem;
}

.license-note {
  color: #45515e;
  margin-top: 1.5rem;
}

@media screen and (max-width: 1023px) {
  .metric-grid--four,
  .file-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media screen and (max-width: 768px) {
  main > .section.neck-hero {
    padding-top: 4.5rem;
  }

  .neck-nav ul {
    font-size: 0.85rem;
  }

  .neck-nav a {
    padding: 0.3rem 0.7rem;
  }

  .neck-hero-grid,
  .build-step,
  .mount-grid,
  .variant-card {
    grid-template-columns: 1fr;
  }

  .variant-figure {
    margin: 0 auto;
    max-width: 200px;
  }

  .neck-hero-figure {
    order: -1;
  }

  .neck-hero-figure.neck-viewer {
    margin: 0 auto;
    max-height: 380px;
    max-width: 320px;
  }

  .build-step:nth-child(even) .build-step-figure {
    order: 0;
  }

  .build-step {
    padding: 1.1rem;
  }

  .metric-grid--four {
    gap: 0.6rem;
  }

  .file-grid {
    grid-template-columns: 1fr;
  }

  .neck-table td:first-child {
    white-space: normal;
  }
}

@media (prefers-reduced-transparency: reduce) {
  .neck-nav ul {
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
    background: #17202a;
  }
}

.neck-table caption {
  padding-left: 0.25rem;
}

@media screen and (max-width: 768px) {
  .flow-row {
    align-items: flex-start;
    flex-direction: column;
  }

  .flow-arrow {
    padding-left: 1rem;
  }

  .flow-label {
    flex: none;
  }

  .flow-arrow::after {
    content: ' \2193';
  }
}