/* Permanente Corporation — Industrial aesthetic stylesheet
   Concrete grays, paper white, matte black, Permanente green as sharp accent */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;700&family=Space+Grotesk:wght@400;500;600;700&display=swap');

:root {
  --concrete: #e4e7e4;
  --concrete-2: #d4d7d3;
  --paper: #f7f7f5;
  --paper-2: #eeeeec;
  --ink: #15181a;
  --ink-2: #2a2e30;
  --graphite: #5c6165;
  --line: #0f1214;
  --line-soft: rgba(15, 18, 20, 0.12);
  --line-rule: rgba(15, 18, 20, 0.20);
  --accent: #096d42;
  --accent-hi: #0a8751;
  --accent-2: #c4642b;
  --max: 1280px;
  --gutter: 24px;
  --sans: 'Inter', ui-sans-serif, system-ui, sans-serif;
  --display: 'Space Grotesk', ui-sans-serif, system-ui, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, 'SF Mono', 'Courier New', monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--sans);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.55;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

.wrap { width: min(calc(100% - 32px), var(--max)); margin: 0 auto; }

/* ========= Global technical grid accent ========= */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(15,18,20,0.025) 1px, transparent 1px);
  background-size: 80px 100%;
  pointer-events: none;
  z-index: 1;
}

/* ========= Header and hamburger ========= */
header.site-header {
  padding: 20px 0 18px;
  border-bottom: 1px solid var(--line);
  position: relative;
  z-index: 100;
  background: var(--paper);
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
}

.brand-lockup {
  display: inline-flex;
  align-items: center;
  gap: 16px;
  min-width: 0;
  flex: 1 1 auto;
}

.brand-logo {
  height: 36px;
  width: auto;
  display: block;
  flex: 0 0 auto;
}

.brand-meta {
  display: flex;
  flex-direction: column;
  border-left: 1px solid var(--line);
  padding-left: 16px;
  min-width: 0;
}

.brand-meta .label {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--graphite);
  line-height: 1.2;
}

.brand-meta .name {
  font-family: var(--display);
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.005em;
  color: var(--ink);
  margin-top: 2px;
}

.nav-toggle {
  background: var(--paper);
  border: 1px solid var(--line);
  width: 48px;
  height: 48px;
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  cursor: pointer;
  padding: 0;
  transition: background 0.15s ease, color 0.15s ease;
  flex: 0 0 auto;
  position: relative;
}

.nav-toggle::before {
  content: "MENU";
  position: absolute;
  left: -48px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--graphite);
}

.nav-toggle:hover, .nav-toggle:focus-visible {
  background: var(--ink);
  outline: none;
}

.nav-toggle:hover .bar,
.nav-toggle:focus-visible .bar {
  background: var(--paper);
}

.nav-toggle .bar {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--ink);
  transition: transform 0.25s ease, opacity 0.2s ease, background 0.15s ease;
}

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

/* ========= Nav overlay — full-screen grid menu ========= */
.nav-overlay {
  position: fixed;
  inset: 0;
  background: var(--ink);
  color: var(--paper);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
  z-index: 90;
  overflow-y: auto;
  padding: 80px 32px 32px;
}

.nav-overlay[aria-hidden="false"] { opacity: 1; pointer-events: auto; }

.nav-overlay-inner {
  max-width: var(--max);
  margin: 0 auto;
  transform: translateY(16px);
  opacity: 0;
  transition: transform 0.4s ease, opacity 0.4s ease;
  transition-delay: 0.05s;
}

.nav-overlay[aria-hidden="false"] .nav-overlay-inner {
  transform: translateY(0);
  opacity: 1;
}

.nav-overlay-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding-bottom: 24px;
  border-bottom: 1px solid rgba(247,247,245,0.2);
  margin-bottom: 32px;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(247,247,245,0.65);
}

.nav-overlay-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
  border-top: 1px solid rgba(247,247,245,0.15);
  border-left: 1px solid rgba(247,247,245,0.15);
}

.nav-overlay-grid a {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 28px 24px;
  border-right: 1px solid rgba(247,247,245,0.15);
  border-bottom: 1px solid rgba(247,247,245,0.15);
  transition: background 0.15s ease;
  color: var(--paper);
  min-height: 140px;
}

.nav-overlay-grid a:hover,
.nav-overlay-grid a:focus-visible {
  background: rgba(9, 109, 66, 0.22);
  outline: none;
}

.nav-overlay-grid a.current {
  background: var(--accent);
}

.nav-overlay-grid .num {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: rgba(247,247,245,0.55);
  text-transform: uppercase;
}

.nav-overlay-grid a.current .num { color: rgba(255,255,255,0.8); }

.nav-overlay-grid .title {
  font-family: var(--display);
  font-size: 1.35rem;
  font-weight: 500;
  letter-spacing: -0.005em;
  line-height: 1.15;
}

.nav-overlay-grid .desc {
  font-size: 0.86rem;
  color: rgba(247,247,245,0.7);
  line-height: 1.45;
  margin-top: auto;
}

.nav-overlay-grid a.current .desc { color: rgba(255,255,255,0.85); }

.nav-overlay-footer {
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid rgba(247,247,245,0.2);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  color: rgba(247,247,245,0.7);
}

.nav-overlay-footer a { color: var(--paper); border-bottom: 1px solid rgba(247,247,245,0.4); padding-bottom: 1px; }
.nav-overlay-footer a:hover { border-bottom-color: var(--paper); }

body.nav-open { overflow: hidden; }

/* ========= Page-identifier bar ========= */
.page-id-bar {
  background: var(--ink);
  color: var(--paper);
  padding: 8px 0;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  position: relative;
  z-index: 5;
}

.page-id-bar .wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.page-id-bar .right { color: rgba(247,247,245,0.65); }

/* ========= Hero section ========= */
.hero {
  padding: 48px 0 56px;
  border-bottom: 1px solid var(--line);
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.hero-grid.single { grid-template-columns: 1fr; }

.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 20px;
}

.hero-kicker::before {
  content: "";
  width: 32px;
  height: 1px;
  background: var(--accent);
}

.hero-title {
  font-family: var(--display);
  font-size: clamp(2.2rem, 3.5vw + 1rem, 3.4rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0 0 24px;
  font-weight: 500;
  color: var(--ink);
}

.hero-title em {
  font-style: normal;
  color: var(--accent);
}

.hero-lede {
  font-size: 1.1rem;
  color: var(--ink-2);
  max-width: 58ch;
  margin: 0 0 24px;
}

.hero-lede + .hero-lede { margin-top: 16px; }

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 46px;
  padding: 0 22px;
  font-family: var(--sans);
  font-size: 0.94rem;
  font-weight: 500;
  letter-spacing: 0.005em;
  border-radius: 0;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
  white-space: nowrap;
  border: 1px solid var(--ink);
}

.btn-primary { background: var(--ink); color: var(--paper); }
.btn-primary:hover { background: var(--accent); border-color: var(--accent); transform: translateY(-1px); }

.btn-secondary { background: transparent; color: var(--ink); }
.btn-secondary:hover { background: var(--ink); color: var(--paper); transform: translateY(-1px); }

.btn .arrow {
  display: inline-block;
  transition: transform 0.15s ease;
}
.btn:hover .arrow { transform: translateX(3px); }

/* Hero-side content module */
.hero-module {
  border: 1px solid var(--line);
  background: var(--paper-2);
  padding: 28px;
  position: relative;
}

.hero-module::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 24px;
  height: 24px;
  border-top: 2px solid var(--accent);
  border-left: 2px solid var(--accent);
}

.hero-module-label {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--graphite);
  margin-bottom: 12px;
}

.hero-module h2 {
  font-family: var(--display);
  font-size: 1.6rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  margin: 0 0 12px;
  color: var(--ink);
}

.hero-module p {
  margin: 0 0 18px;
  font-size: 0.96rem;
  color: var(--ink-2);
}

.hero-module ul {
  list-style: none;
  padding: 0;
  margin: 0;
  border-top: 1px solid var(--line-soft);
}

.hero-module ul li {
  padding: 12px 0;
  border-bottom: 1px solid var(--line-soft);
  font-size: 0.9rem;
  display: flex;
  gap: 12px;
  color: var(--ink-2);
}

.hero-module ul li::before {
  content: attr(data-n);
  font-family: var(--mono);
  color: var(--accent);
  flex-shrink: 0;
  min-width: 24px;
}

/* ========= Section ========= */
.section {
  padding: 64px 0 40px;
  border-bottom: 1px solid var(--line-soft);
}

.section:last-of-type { border-bottom: none; }

.section-id {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.section-id::before {
  content: "§";
  font-size: 1rem;
  color: var(--accent);
}

.section-head {
  margin-bottom: 32px;
  max-width: 820px;
}

.section-head h2 {
  font-family: var(--display);
  font-size: clamp(1.7rem, 1.8vw + 1rem, 2.4rem);
  line-height: 1.15;
  letter-spacing: -0.015em;
  margin: 0;
  font-weight: 500;
  color: var(--ink);
}

.section-head h2 em {
  font-style: normal;
  color: var(--accent);
}

.section-head p.lede {
  font-size: 1.04rem;
  color: var(--ink-2);
  margin: 14px 0 0;
  max-width: 68ch;
}

/* ========= Data / spec-sheet components ========= */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0;
  border: 1px solid var(--line);
  border-right: none;
  border-bottom: none;
}

.stat {
  padding: 24px 22px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}

.stat-id {
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--graphite);
  margin-bottom: 10px;
}

.stat-value {
  font-family: var(--display);
  font-size: 2rem;
  font-weight: 600;
  color: var(--ink);
  line-height: 1;
  letter-spacing: -0.02em;
}

.stat-unit {
  font-family: var(--mono);
  font-size: 0.74rem;
  color: var(--graphite);
  margin-left: 4px;
}

.stat-label {
  font-size: 0.86rem;
  color: var(--ink-2);
  margin-top: 10px;
  line-height: 1.4;
}

/* ========= Product / feature grid ========= */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.feature-item {
  grid-column: span 6;
  padding: 28px 26px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--paper);
  transition: background 0.15s ease;
  position: relative;
}

.feature-item:hover { background: var(--paper-2); }

.feature-item.wide { grid-column: span 12; }
.feature-item.third { grid-column: span 4; }

.feature-num {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--accent);
  margin-bottom: 10px;
}

.feature-title {
  font-family: var(--display);
  font-size: 1.24rem;
  font-weight: 500;
  letter-spacing: -0.005em;
  line-height: 1.25;
  margin: 0 0 12px;
  color: var(--ink);
}

.feature-item p {
  margin: 0 0 12px;
  font-size: 0.96rem;
  color: var(--ink-2);
  line-height: 1.55;
}

.feature-item p:last-child { margin-bottom: 0; }

.feature-item ul {
  list-style: none;
  padding: 0;
  margin: 12px 0 0;
  font-size: 0.88rem;
  color: var(--graphite);
}

.feature-item ul li {
  padding: 6px 0;
  border-top: 1px solid var(--line-soft);
}

/* ========= Narrative block — long-form body ========= */
.narrative {
  background: var(--paper-2);
  border-left: 3px solid var(--accent);
  padding: 28px 32px;
  margin: 24px 0;
  max-width: 880px;
}

.narrative p {
  font-size: 1rem;
  color: var(--ink);
  margin: 0 0 14px;
  line-height: 1.65;
}

.narrative p:last-child { margin-bottom: 0; }

.narrative .label {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}

/* ========= Diagrams ========= */
.diagram {
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 28px;
  margin: 24px 0;
}

.diagram .diagram-label {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--graphite);
  margin-bottom: 14px;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.diagram .diagram-label .right { color: var(--accent); }

.diagram svg {
  width: 100%;
  height: auto;
  display: block;
  max-width: 100%;
}

.diagram .caption {
  font-size: 0.86rem;
  color: var(--graphite);
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
  line-height: 1.5;
  max-width: 72ch;
}

/* ========= Download cards ========= */
.download-list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--line);
}

.download-item {
  display: grid;
  grid-template-columns: 80px 1fr auto;
  gap: 24px;
  padding: 26px 0;
  border-bottom: 1px solid var(--line);
  align-items: start;
  transition: background 0.15s ease;
}

.download-item:hover { background: var(--paper-2); padding-left: 12px; padding-right: 12px; }

.download-num {
  font-family: var(--mono);
  font-size: 0.86rem;
  letter-spacing: 0.1em;
  color: var(--accent);
  padding-top: 3px;
}

.download-content h3 {
  font-family: var(--display);
  font-size: 1.25rem;
  font-weight: 500;
  letter-spacing: -0.005em;
  margin: 0 0 8px;
  color: var(--ink);
}

.download-content p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--ink-2);
  line-height: 1.5;
  max-width: 72ch;
}

.download-meta {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--graphite);
  text-transform: uppercase;
  padding-top: 4px;
  margin-bottom: 12px;
  text-align: right;
}

.download-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  background: var(--ink);
  color: var(--paper);
  border: 1px solid var(--ink);
  font-family: var(--sans);
  font-size: 0.86rem;
  font-weight: 500;
  letter-spacing: 0.005em;
  transition: background 0.15s ease, border-color 0.15s ease;
  white-space: nowrap;
}

.download-link:hover { background: var(--accent); border-color: var(--accent); }

.download-link svg {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}

/* ========= Contact ========= */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
  border: 1px solid var(--line);
  border-right: none;
  border-bottom: none;
}

.contact-block {
  padding: 28px 26px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}

.contact-block .label {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}

.contact-block h3 {
  font-family: var(--display);
  font-size: 1.15rem;
  font-weight: 500;
  letter-spacing: -0.005em;
  margin: 0 0 12px;
  color: var(--ink);
}

.contact-block p, .contact-block address {
  font-style: normal;
  font-size: 0.94rem;
  color: var(--ink-2);
  line-height: 1.6;
  margin: 0;
}

.contact-block a { color: var(--accent); border-bottom: 1px solid var(--accent); padding-bottom: 1px; }
.contact-block a:hover { color: var(--accent-hi); border-bottom-color: var(--accent-hi); }

/* ========= Footer ========= */
footer.site-footer {
  background: var(--ink);
  color: var(--paper);
  padding: 48px 0 32px;
  margin-top: 64px;
  position: relative;
  z-index: 5;
}

footer.site-footer .wrap { display: flex; flex-direction: column; gap: 28px; }

footer.site-footer .footer-top {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 40px;
  padding-bottom: 28px;
  border-bottom: 1px solid rgba(247,247,245,0.2);
  align-items: start;
}

footer.site-footer .footer-brand img {
  height: 32px;
  width: auto;
  display: block;
  filter: brightness(0) invert(1);
  margin-bottom: 16px;
}

footer.site-footer .footer-brand p {
  font-size: 0.88rem;
  color: rgba(247,247,245,0.75);
  line-height: 1.6;
  margin: 0;
  max-width: 48ch;
}

footer.site-footer .footer-cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

footer.site-footer .col-label {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(247,247,245,0.6);
  margin-bottom: 14px;
}

footer.site-footer .col a,
footer.site-footer .col p {
  display: block;
  font-size: 0.88rem;
  color: rgba(247,247,245,0.85);
  padding: 4px 0;
  margin: 0;
  line-height: 1.5;
}

footer.site-footer .col a:hover { color: var(--paper); }

footer.site-footer .footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: rgba(247,247,245,0.55);
}

/* ========= Responsive ========= */
@media (max-width: 960px) {
  .hero-grid { grid-template-columns: 1fr; gap: 32px; }
  .feature-item { grid-column: span 12; }
  .feature-item.third { grid-column: span 12; }
  .contact-grid { grid-template-columns: 1fr; }
  footer.site-footer .footer-top { grid-template-columns: 1fr; }
  footer.site-footer .footer-cols { grid-template-columns: repeat(2, 1fr); }
  .nav-overlay-grid { grid-template-columns: 1fr; }
  .download-item { grid-template-columns: 60px 1fr; }
  .download-meta { display: none; }
  .download-item .download-link-wrap { grid-column: 1 / -1; margin-top: 12px; }
}

@media (max-width: 640px) {
  body::before { background-size: 40px 100%; }
  .brand-meta { display: none; }
  .nav-toggle::before { display: none; }
  .hero { padding: 36px 0 40px; }
  .section { padding: 44px 0 28px; }
  .narrative { padding: 22px 20px; }
  .feature-item { padding: 22px 20px; }
  footer.site-footer .footer-cols { grid-template-columns: 1fr; }
}

@media print {
  body::before { display: none; }
  body { background: #fff; color: #000; }
  .nav-toggle, .nav-overlay, .cta-row, .page-id-bar { display: none !important; }
  .hero, .section { border: none; }
  footer.site-footer { background: #fff; color: #000; }
  a { color: #000; }
}