/* ==========================================================================
   MAVERICK PERFORMANCE SOLUTIONS — Component Library
   main.css — per BUILD_SPEC §2. Requires tokens.css loaded first.
   ========================================================================== */

/* --------------------------------------------------------------------------
   Layout primitives
   -------------------------------------------------------------------------- */

.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: 24px;
}

.section {
  padding-block: 88px;
}

.section--tight {
  padding-block: 56px;
}

.section--dark,
.dark-section {
  background-color: var(--mav-charcoal);
  background-image:
    repeating-linear-gradient(45deg, rgba(255,255,255,.015) 0 2px, transparent 2px 6px),
    repeating-linear-gradient(-45deg, rgba(255,255,255,.015) 0 2px, transparent 2px 6px);
  color: #E8ECF2;
}

.section--dark h2,
.section--dark h3,
.dark-section h2,
.dark-section h3 {
  color: #FFFFFF;
}

.section--dark a:not(.btn),
.dark-section a:not(.btn) {
  color: var(--mav-blue-electric);
}

.section--dark a:not(.btn):hover,
.dark-section a:not(.btn):hover {
  color: #FFFFFF;
}

.section-label {
  display: block;
  font-family: var(--font-display);
  font-size: .95rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .14em;
  color: var(--mav-blue);
  margin-bottom: 12px;
}

.section--dark .section-label,
.dark-section .section-label {
  color: var(--mav-blue-electric);
}

.section-head {
  max-width: 720px;
  margin-bottom: 48px;
}

.section-head--center {
  margin-inline: auto;
  text-align: center;
}

.section-head p {
  margin-top: 16px;
  color: var(--mav-steel);
  font-size: 1.075rem;
}

.section--dark .section-head p,
.dark-section .section-head p {
  color: #A9B2BF;
}

.lead {
  font-size: 1.15rem;
  color: var(--mav-steel);
  max-width: 64ch;
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 28px;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .06em;
  line-height: 1;
  color: #FFFFFF;
  background: var(--mav-blue);
  border: 1px solid var(--mav-blue);
  border-radius: var(--radius);
  text-decoration: none;
  white-space: nowrap;
  transition: background-color .18s ease, border-color .18s ease, color .18s ease, transform .18s ease, box-shadow .18s ease;
}

.btn:hover {
  background: var(--mav-blue-deep);
  border-color: var(--mav-blue-deep);
  color: #FFFFFF;
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(14,95,216,.28);
}

.btn:active {
  transform: translateY(0);
  box-shadow: none;
}

.btn--ghost {
  background: transparent;
  border-color: rgba(255,255,255,.45);
  color: #FFFFFF;
}

.btn--ghost:hover {
  background: rgba(255,255,255,.08);
  border-color: #FFFFFF;
  color: #FFFFFF;
  box-shadow: none;
}

/* Ghost on light surfaces (e.g. doc rows, light sections) */
.btn--ghost-dark,
.section .btn--ghost-dark,
.doc-row .btn--ghost,
.card .btn--ghost {
  background: transparent;
  border-color: var(--mav-line);
  color: var(--mav-blue);
}

.btn--ghost-dark:hover,
.doc-row .btn--ghost:hover,
.card .btn--ghost:hover {
  background: rgba(14,95,216,.06);
  border-color: var(--mav-blue);
  color: var(--mav-blue-deep);
  box-shadow: none;
}

.btn--safety {
  background: var(--mav-safety);
  border-color: var(--mav-safety);
  color: var(--mav-ink);
}

.btn--safety:hover {
  background: #E07900;
  border-color: #E07900;
  color: var(--mav-ink);
  box-shadow: 0 6px 16px rgba(255,138,0,.30);
}

.btn--sm {
  padding: 9px 18px;
  font-size: .95rem;
}

.btn--lg {
  padding: 16px 36px;
  font-size: 1.15rem;
}

/* --------------------------------------------------------------------------
   Header
   -------------------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--mav-surface);
  border-top: 3px solid var(--mav-blue);
  border-bottom: 1px solid var(--mav-line);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  min-height: 76px;
}

/* Logo lockup — brand mark SVG beside the wordmark SVG.
   Markup: <a class="logo" href="...">
             <img class="logo__mark" src="assets/img/logo-mark-color.svg" alt="Maverick Performance Solutions">
             <img class="logo__word" src="assets/img/logo-wordmark-color.svg" alt="">
           </a>
   Footer uses the -dark-bg.svg variants, sized via .site-footer scope. */
.logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.logo__mark {
  height: 44px;
  width: auto;
}

.logo__word {
  height: 26px;
  width: auto;
}

/* Dark-surface logo (footer) */
.site-footer .logo__mark {
  height: 38px;
}

.site-footer .logo__word {
  height: 22px;
}

/* Navigation */
.site-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.site-nav ul {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.site-nav a:not(.nav-cta) {
  display: inline-block;
  position: relative;
  padding: 26px 14px;
  font-family: var(--font-display);
  font-size: 1.08rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--mav-ink);
  text-decoration: none;
  transition: color .18s ease;
}

.site-nav a:not(.nav-cta):hover {
  color: var(--mav-blue);
}

.site-nav a:not(.nav-cta)::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 16px;
  height: 3px;
  background: var(--mav-blue);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .2s ease;
}

.site-nav a:not(.nav-cta):hover::after,
.site-nav a.is-active::after {
  transform: scaleX(1);
}

.site-nav a.is-active {
  color: var(--mav-blue);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  margin-left: 16px;
  padding: 11px 22px;
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .06em;
  line-height: 1;
  color: #FFFFFF;
  background: var(--mav-blue);
  border-radius: var(--radius);
  text-decoration: none;
  transition: background-color .18s ease, box-shadow .18s ease;
}

.nav-cta:hover {
  background: var(--mav-blue-deep);
  color: #FFFFFF;
  box-shadow: 0 4px 12px rgba(14,95,216,.28);
}

/* Mobile toggle (hidden on desktop) */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  border-radius: var(--radius);
}

.nav-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--mav-ink);
  border-radius: 2px;
  transition: transform .2s ease, opacity .2s ease;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* --------------------------------------------------------------------------
   Hero
   -------------------------------------------------------------------------- */

.hero {
  position: relative;
  background-color: var(--mav-charcoal);
  background-image:
    radial-gradient(1100px 480px at 78% -10%, rgba(14,95,216,.22), transparent 60%),
    radial-gradient(700px 380px at 8% 110%, rgba(61,139,255,.10), transparent 60%),
    repeating-linear-gradient(45deg, rgba(255,255,255,.015) 0 2px, transparent 2px 6px),
    repeating-linear-gradient(-45deg, rgba(255,255,255,.015) 0 2px, transparent 2px 6px);
  color: #FFFFFF;
  padding-block: 120px 128px;
  overflow: hidden;
}

.hero::after {
  /* thin electric rule along hero base */
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--mav-blue) 0%, var(--mav-blue-electric) 45%, transparent 90%);
}

.hero .container {
  position: relative;
}

.hero h1 {
  color: #FFFFFF;
  max-width: 18ch;
  margin-bottom: 22px;
}

.hero__kicker {
  display: block;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .16em;
  color: var(--mav-blue-electric);
  margin-bottom: 18px;
}

.hero p,
.hero__lead {
  font-size: 1.18rem;
  line-height: 1.65;
  color: #B7C0CC;
  max-width: 58ch;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 36px;
}

/* Interior hero — smaller, with breadcrumb */
.hero--interior {
  padding-block: 36px 64px;
}

.hero--interior h1 {
  font-size: clamp(2.1rem, 4vw, 3rem);
  margin-bottom: 14px;
}

.hero--interior p,
.hero--interior .hero__lead {
  font-size: 1.08rem;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  list-style: none;
  margin-bottom: 28px;
  font-size: .85rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: .08em;
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #8E98A6;
}

.breadcrumb li + li::before {
  content: "/";
  color: #4A5260;
}

.breadcrumb a {
  color: var(--mav-blue-electric);
  text-decoration: none;
}

.breadcrumb a:hover {
  color: #FFFFFF;
}

.breadcrumb [aria-current="page"] {
  color: #C7CFDA;
}

/* --------------------------------------------------------------------------
   Cards
   -------------------------------------------------------------------------- */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 28px;
}

.card-grid--2 {
  grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
}

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 14px;
  background: var(--mav-surface);
  border: 1px solid var(--mav-line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  padding: 32px 28px;
  color: var(--mav-ink);
  overflow: hidden;
  transition: transform .22s ease, box-shadow .22s ease;
}

.card::before {
  /* blue top border reveal */
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--mav-blue);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .25s ease;
}

.card:hover,
.card:focus-within {
  transform: translateY(-5px);
  box-shadow: 0 4px 8px rgba(20,23,28,.10), 0 18px 40px rgba(20,23,28,.12);
}

.card:hover::before,
.card:focus-within::before {
  transform: scaleX(1);
}

.card h3 {
  color: var(--mav-ink);
}

.card p {
  color: var(--mav-steel);
  font-size: .98rem;
}

.card__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: var(--radius);
  background: rgba(14,95,216,.08);
  color: var(--mav-blue);
  margin-bottom: 4px;
}

.card__icon svg {
  width: 28px;
  height: 28px;
}

.card__meta {
  font-size: .82rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--mav-steel);
}

.card__link {
  margin-top: auto;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--mav-blue);
  text-decoration: none;
}

.card__link::after {
  content: " \2192";
}

/* Whole-card link helper: <a class="card card--link"> */
a.card,
.card--link {
  text-decoration: none;
  cursor: pointer;
}

/* Dark card variant for dark sections */
.card--dark {
  background: var(--mav-charcoal-2);
  border-color: rgba(255,255,255,.08);
  color: #E8ECF2;
}

.card--dark h3 { color: #FFFFFF; }
.card--dark p  { color: #A9B2BF; }
.card--dark .card__icon {
  background: rgba(61,139,255,.12);
  color: var(--mav-blue-electric);
}
.card--dark .card__link { color: var(--mav-blue-electric); }

/* --------------------------------------------------------------------------
   Stat row
   -------------------------------------------------------------------------- */

.stat-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 32px;
}

.stat {
  border-left: 3px solid var(--mav-blue);
  padding-left: 20px;
}

.stat__number {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 4vw, 3.4rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: .01em;
  color: var(--mav-ink);
}

.stat__label {
  display: block;
  margin-top: 8px;
  font-size: .85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--mav-steel);
}

.section--dark .stat__number,
.dark-section .stat__number,
.hero .stat__number {
  color: #FFFFFF;
}

.section--dark .stat,
.dark-section .stat,
.hero .stat {
  border-left-color: var(--mav-blue-electric);
}

.section--dark .stat__label,
.dark-section .stat__label,
.hero .stat__label {
  color: #8E98A6;
}

/* --------------------------------------------------------------------------
   CTA band
   -------------------------------------------------------------------------- */

.cta-band {
  background-color: var(--mav-charcoal);
  background-image:
    radial-gradient(900px 360px at 85% 0%, rgba(14,95,216,.25), transparent 60%),
    repeating-linear-gradient(45deg, rgba(255,255,255,.015) 0 2px, transparent 2px 6px),
    repeating-linear-gradient(-45deg, rgba(255,255,255,.015) 0 2px, transparent 2px 6px);
  border-top: 3px solid var(--mav-blue);
  color: #FFFFFF;
  padding-block: 72px;
}

.cta-band .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  flex-wrap: wrap;
}

.cta-band h2 {
  color: #FFFFFF;
  max-width: 22ch;
}

.cta-band p {
  margin-top: 12px;
  color: #A9B2BF;
  max-width: 56ch;
}

.cta-band__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */

.site-footer {
  background-color: var(--mav-charcoal);
  background-image:
    repeating-linear-gradient(45deg, rgba(255,255,255,.015) 0 2px, transparent 2px 6px),
    repeating-linear-gradient(-45deg, rgba(255,255,255,.015) 0 2px, transparent 2px 6px);
  color: #A9B2BF;
  padding-top: 72px;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 56px;
}

.site-footer h4 {
  color: #FFFFFF;
  font-size: 1.05rem;
  letter-spacing: .08em;
  margin-bottom: 18px;
}

.site-footer ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.site-footer a {
  color: #A9B2BF;
  text-decoration: none;
  font-size: .95rem;
  transition: color .18s ease;
}

.site-footer a:hover {
  color: #FFFFFF;
}

.site-footer__tagline {
  margin-top: 18px;
  font-size: .95rem;
  line-height: 1.6;
  color: #8E98A6;
  max-width: 32ch;
}

.site-footer__address {
  font-size: .85rem;
  line-height: 1.5;
  color: #8E98A6;
}

.site-footer__bottom {
  border-top: 1px solid rgba(255,255,255,.08);
  padding-block: 22px;
  font-size: .85rem;
  color: #717B89;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

/* --------------------------------------------------------------------------
   Badge
   -------------------------------------------------------------------------- */

.badge {
  display: inline-block;
  padding: 4px 10px;
  font-size: .72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .1em;
  line-height: 1.4;
  color: var(--mav-blue);
  background: rgba(14,95,216,.08);
  border: 1px solid rgba(14,95,216,.25);
  border-radius: 999px;
  white-space: nowrap;
}

.badge--safety {
  color: #7A4200;
  background: rgba(255,138,0,.12);
  border-color: rgba(255,138,0,.45);
}

.badge--dark {
  color: var(--mav-blue-electric);
  background: rgba(61,139,255,.12);
  border-color: rgba(61,139,255,.35);
}

.badge--neutral {
  color: var(--mav-steel);
  background: rgba(90,100,114,.08);
  border-color: var(--mav-line);
}

/* Industry chips (system pages: "Where it performs") */
.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  list-style: none;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  font-family: var(--font-display);
  font-size: .98rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--mav-ink);
  background: var(--mav-surface);
  border: 1px solid var(--mav-line);
  border-radius: 999px;
}

/* --------------------------------------------------------------------------
   Color swatches (Architect Center, Joint Systems)
   Markup pattern:
   <ul class="swatch-grid">
     <li class="swatch" style="--sw:var(--mavjoint-black)">
       <span class="swatch__color" aria-hidden="true"></span>
       <span class="swatch__name">Black</span>
       <span class="swatch__note">Optional one-line note</span>
     </li>
   </ul>
   -------------------------------------------------------------------------- */

.swatch-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  gap: 20px;
  list-style: none;
}

.swatch {
  background: var(--mav-surface);
  border: 1px solid var(--mav-line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.swatch__color {
  display: block;
  height: 84px;
  background: var(--sw);
  border-bottom: 1px solid var(--mav-line);
}

.swatch__name {
  display: block;
  padding: 12px 14px 2px;
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--mav-ink);
}

.swatch__name:last-child {
  padding-bottom: 12px;
}

.swatch__note {
  display: block;
  padding: 0 14px 12px;
  font-size: .78rem;
  color: var(--mav-steel);
}

/* --------------------------------------------------------------------------
   Feature list (checkmarks)
   -------------------------------------------------------------------------- */

.feature-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.feature-list li {
  position: relative;
  padding-left: 34px;
  line-height: 1.55;
}

.feature-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background-color: rgba(14,95,216,.10);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%230E5FD8' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 12.5l4.5 4.5L19 7.5'/%3E%3C/svg%3E");
  background-size: 13px;
  background-position: center;
  background-repeat: no-repeat;
}

.section--dark .feature-list li::before,
.dark-section .feature-list li::before {
  background-color: rgba(61,139,255,.15);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%233D8BFF' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 12.5l4.5 4.5L19 7.5'/%3E%3C/svg%3E");
}

/* --------------------------------------------------------------------------
   Spec table
   -------------------------------------------------------------------------- */

.table-spec {
  width: 100%;
  background: var(--mav-surface);
  border: 1px solid var(--mav-line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  font-size: .95rem;
}

.table-spec caption {
  caption-side: bottom;
  padding: 12px 4px 0;
  font-size: .82rem;
  color: var(--mav-steel);
  text-align: left;
}

.table-spec th,
.table-spec td {
  padding: 14px 20px;
  text-align: left;
  border-bottom: 1px solid var(--mav-line);
  vertical-align: top;
}

.table-spec thead th {
  font-family: var(--font-display);
  font-size: .95rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: #FFFFFF;
  background: var(--mav-charcoal);
  border-bottom: 3px solid var(--mav-blue);
}

.table-spec tbody th {
  font-weight: 600;
  color: var(--mav-ink);
  white-space: nowrap;
}

.table-spec tbody td {
  color: var(--mav-steel);
}

.table-spec tbody tr:last-child th,
.table-spec tbody tr:last-child td {
  border-bottom: none;
}

.table-spec tbody tr:nth-child(even) {
  background: rgba(245,247,250,.7);
}

.table-wrap {
  overflow-x: auto;
}

/* --------------------------------------------------------------------------
   Document rows (Details & Drawings, Specifications)
   -------------------------------------------------------------------------- */

.doc-group {
  margin-bottom: 40px;
}

.doc-group__title {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--mav-ink);
}

.doc-group__count {
  font-family: var(--font-body);
  font-size: .82rem;
  font-weight: 600;
  text-transform: none;
  letter-spacing: .04em;
  color: var(--mav-steel);
}

.doc-row {
  display: grid;
  grid-template-columns: 44px 150px 1fr auto auto;
  align-items: center;
  gap: 18px;
  padding: 16px 18px;
  background: var(--mav-surface);
  border: 1px solid var(--mav-line);
  border-radius: var(--radius);
  margin-bottom: 10px;
  transition: border-color .18s ease, box-shadow .18s ease;
}

.doc-row:hover {
  border-color: var(--mav-blue);
  box-shadow: var(--shadow-card);
}

.doc-row__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius);
  background: rgba(14,95,216,.08);
  color: var(--mav-blue);
  flex-shrink: 0;
}

.doc-row__icon svg {
  width: 22px;
  height: 22px;
}

.doc-row__code {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--mav-blue);
  white-space: nowrap;
}

.doc-row__title {
  font-weight: 500;
  color: var(--mav-ink);
  line-height: 1.4;
}

.doc-row__desc {
  display: block;
  margin-top: 2px;
  font-size: .85rem;
  font-weight: 400;
  color: var(--mav-steel);
}

.doc-row__size,
.doc-row__meta {
  font-size: .82rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--mav-steel);
  white-space: nowrap;
  text-align: right;
}

.doc-row__action {
  justify-self: end;
}

/* --------------------------------------------------------------------------
   Filter bar
   -------------------------------------------------------------------------- */

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  background: var(--mav-surface);
  border: 1px solid var(--mav-line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  margin-bottom: 32px;
}

.filter-bar label {
  font-size: .8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--mav-steel);
}

.filter-bar input[type="search"],
.filter-bar input[type="text"],
.filter-bar select {
  padding: 10px 14px;
  font-size: .95rem;
  color: var(--mav-ink);
  background: var(--mav-bg);
  border: 1px solid var(--mav-line);
  border-radius: var(--radius);
  transition: border-color .18s ease, box-shadow .18s ease;
}

.filter-bar input[type="search"],
.filter-bar input[type="text"] {
  flex: 1 1 220px;
  min-width: 180px;
}

.filter-bar input:focus-visible,
.filter-bar select:focus-visible {
  outline: none;
  border-color: var(--mav-blue);
  box-shadow: 0 0 0 3px rgba(14,95,216,.18);
}

.filter-bar__count {
  margin-left: auto;
  font-size: .85rem;
  font-weight: 600;
  color: var(--mav-steel);
  white-space: nowrap;
}

/* --------------------------------------------------------------------------
   Tree nav (catalog left rail)
   Markup pattern:
   <nav class="tree-nav">
     <div class="tree-nav__group">
       <button class="tree-nav__toggle" aria-expanded="true">Epoxy
         <span class="tree-nav__count">22</span></button>
       <ul class="tree-nav__list">
         <li><a href="#ep-cv">Cove Base <span class="tree-nav__count">5</span></a></li>
       </ul>
     </div>
   </nav>
   -------------------------------------------------------------------------- */

.tree-nav {
  background: var(--mav-surface);
  border: 1px solid var(--mav-line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  padding: 10px;
  align-self: start;
  position: sticky;
  top: 100px;
}

.tree-nav__group + .tree-nav__group {
  border-top: 1px solid var(--mav-line);
}

.tree-nav__toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  width: 100%;
  padding: 13px 12px;
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--mav-ink);
  text-align: left;
  border-radius: var(--radius);
  transition: color .18s ease, background-color .18s ease;
}

.tree-nav__toggle:hover {
  color: var(--mav-blue);
  background: rgba(14,95,216,.05);
}

.tree-nav__toggle::before {
  content: "";
  flex-shrink: 0;
  width: 9px;
  height: 9px;
  border-right: 2px solid var(--mav-blue);
  border-bottom: 2px solid var(--mav-blue);
  transform: rotate(-45deg);
  transition: transform .2s ease;
  margin-right: 2px;
}

.tree-nav__toggle[aria-expanded="true"]::before {
  transform: rotate(45deg);
}

.tree-nav__toggle .tree-nav__count {
  margin-left: auto;
}

.tree-nav__list {
  list-style: none;
  padding: 2px 0 10px 23px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.tree-nav__toggle[aria-expanded="false"] + .tree-nav__list {
  display: none;
}

.tree-nav__list a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 8px 10px;
  font-size: .92rem;
  font-weight: 500;
  color: var(--mav-steel);
  text-decoration: none;
  border-left: 2px solid var(--mav-line);
  transition: color .18s ease, border-color .18s ease, background-color .18s ease;
}

.tree-nav__list a:hover,
.tree-nav__list a.is-active {
  color: var(--mav-blue);
  border-left-color: var(--mav-blue);
  background: rgba(14,95,216,.05);
}

.tree-nav__count {
  font-family: var(--font-body);
  font-size: .72rem;
  font-weight: 600;
  color: var(--mav-steel);
  background: var(--mav-bg);
  border: 1px solid var(--mav-line);
  border-radius: 999px;
  padding: 1px 8px;
  white-space: nowrap;
}

/* Two-column catalog layout */
.catalog-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 40px;
  align-items: start;
}

/* --------------------------------------------------------------------------
   Forms (contact page)
   -------------------------------------------------------------------------- */

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.field--full {
  grid-column: 1 / -1;
}

.field label {
  font-size: .82rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--mav-ink);
}

.field input,
.field select,
.field textarea {
  padding: 12px 14px;
  font-size: .98rem;
  color: var(--mav-ink);
  background: var(--mav-surface);
  border: 1px solid var(--mav-line);
  border-radius: var(--radius);
  transition: border-color .18s ease, box-shadow .18s ease;
}

.field textarea {
  min-height: 140px;
  resize: vertical;
}

.field input:focus-visible,
.field select:focus-visible,
.field textarea:focus-visible {
  outline: none;
  border-color: var(--mav-blue);
  box-shadow: 0 0 0 3px rgba(14,95,216,.18);
}

.field__hint {
  font-size: .82rem;
  color: var(--mav-steel);
}

/* --------------------------------------------------------------------------
   Diagram block (SVG cross-sections on system pages)
   -------------------------------------------------------------------------- */

.diagram {
  background: var(--mav-surface);
  border: 1px solid var(--mav-line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  padding: 32px;
}

.diagram svg {
  width: 100%;
  height: auto;
}

.diagram figcaption {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--mav-line);
  font-size: .85rem;
  color: var(--mav-steel);
}

/* Two-column content split (text + diagram / text + list) */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}

.split--start {
  align-items: start;
}

/* --------------------------------------------------------------------------
   Utilities
   -------------------------------------------------------------------------- */

.mt-0 { margin-top: 0; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mt-48 { margin-top: 48px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.mb-32 { margin-bottom: 32px; }
.mb-48 { margin-bottom: 48px; }
.text-center { text-align: center; }
.muted { color: var(--mav-steel); }

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: -48px;
  left: 16px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--mav-blue);
  color: #FFFFFF;
  border-radius: 0 0 var(--radius) var(--radius);
  font-weight: 600;
  transition: top .18s ease;
}

.skip-link:focus {
  top: 0;
  color: #FFFFFF;
}

/* --------------------------------------------------------------------------
   Responsive — single breakpoint @ 880px
   -------------------------------------------------------------------------- */

@media (max-width: 880px) {
  .section {
    padding-block: 56px;
  }

  .hero {
    padding-block: 72px 80px;
  }

  .hero--interior {
    padding-block: 28px 48px;
  }

  /* Header: collapse nav behind toggle */
  .site-header .container {
    flex-wrap: wrap;
    gap: 0;
    padding-block: 12px;
    min-height: 0;
  }

  .nav-toggle {
    display: flex;
    margin-left: auto;
  }

  .site-nav {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 0 16px;
    border-top: 1px solid var(--mav-line);
    margin-top: 12px;
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav ul {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: 100%;
  }

  .site-nav a:not(.nav-cta) {
    display: block;
    padding: 14px 4px;
    border-bottom: 1px solid var(--mav-line);
  }

  .site-nav a:not(.nav-cta)::after {
    left: 4px;
    right: auto;
    bottom: 10px;
    width: 36px;
  }

  .nav-cta {
    margin: 16px 4px 0;
    justify-content: center;
  }

  /* Grids stack */
  .card-grid,
  .card-grid--2,
  .form-grid,
  .split,
  .stat-row {
    grid-template-columns: 1fr;
  }

  .stat-row {
    gap: 24px;
  }

  .site-footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }

  .cta-band .container {
    flex-direction: column;
    align-items: flex-start;
  }

  /* Catalog: rail stacks above content */
  .catalog-layout {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .tree-nav {
    position: static;
  }

  /* Doc rows: stack metadata */
  .doc-row {
    grid-template-columns: 44px 1fr;
    grid-template-areas:
      "icon code"
      "icon title"
      "icon meta"
      "icon action";
    row-gap: 6px;
  }

  .doc-row__icon   { grid-area: icon; align-self: start; }
  .doc-row__code   { grid-area: code; }
  .doc-row__title  { grid-area: title; }
  .doc-row__size,
  .doc-row__meta   { grid-area: meta; text-align: left; }
  .doc-row__action { grid-area: action; justify-self: start; margin-top: 6px; }

  .filter-bar__count {
    margin-left: 0;
    width: 100%;
  }
}

@media (max-width: 560px) {
  .site-footer__grid {
    grid-template-columns: 1fr;
  }
}