/* ==========================================================================
   PanLbilt — Stylesheet
   Design language: architectural drawing set / spec sheet.
   Pages are framed as sheets (A-00 cover, A-01 advantages, etc.), and the
   visual system borrows from construction documents: blueprint grids,
   mono-spaced callouts, sheet numbers, hairline rules, drafting-tape rust.
   ========================================================================== */

:root {
  /* ---- palette ---- */
  --navy-deep:   #10283B;   /* primary ink / headings on light */
  --navy-panel:  #0C1F30;   /* darkest panel bg (footer, deepest sections) */
  --blue-print:  #16354D;   /* blueprint sheet background */
  --blue-line:   #2C567A;   /* blueprint grid line colour */
  --rust:        #B0522C;   /* drafting-tape accent / CTA / links */
  --rust-dim:    #8F4322;   /* rust hover / pressed */
  --chalk:       #EEF2F5;   /* chalk-white text on dark */
  --paper:       #FFFFFF;   /* on-white section bg */
  --paper-tint:  #EDF1F4;   /* on-light section bg */
  --ink:         #1C2733;   /* body text on light */
  --ink-soft:    #4B5158;   /* secondary body text on light */
  --ink-faint:   #5A5F66;   /* tertiary / captions on light */
  --line:        #D7DEE4;   /* hairline rule on light */
  --line-dark:   rgba(238,242,245,0.16); /* hairline rule on dark */

  /* ---- type ---- */
  --font-display: 'Space Grotesk', sans-serif;
  --font-body:    'Inter', sans-serif;
  --font-mono:    'IBM Plex Mono', monospace;

  --wrap: 1180px;
}

/* ---- reset ---- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}
body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  font-size: 16px;
  line-height: 1.55;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, h5 {
  font-family: var(--font-display);
  color: var(--navy-deep);
  margin: 0 0 0.4em;
  line-height: 1.15;
  letter-spacing: -0.01em;
}
p { margin: 0 0 1em; }
:focus-visible {
  outline: 2px solid var(--rust);
  outline-offset: 3px;
}

.wrap {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 28px;
}

/* ---- blueprint grid background ---- */
.blueprint-bg {
  background-color: var(--blue-print);
  background-image:
    linear-gradient(rgba(44,86,122,0.55) 1px, transparent 1px),
    linear-gradient(90deg, rgba(44,86,122,0.55) 1px, transparent 1px),
    linear-gradient(rgba(44,86,122,0.28) 1px, transparent 1px),
    linear-gradient(90deg, rgba(44,86,122,0.28) 1px, transparent 1px);
  background-size: 88px 88px, 88px 88px, 22px 22px, 22px 22px;
  background-position: -1px -1px;
  position: relative;
}
.blueprint-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 20% 0%, rgba(16,40,59,0) 0%, rgba(12,31,48,0.55) 78%);
  pointer-events: none;
}
.blueprint-bg .wrap { position: relative; z-index: 1; }

/* ==========================================================================
   NAV
   ========================================================================== */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(16,40,59,0.96);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line-dark);
}
.nav-inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 28px;
  height: 76px;
  display: flex;
  align-items: center;
  gap: 28px;
}
.wordmark { display: flex; align-items: center; margin-right: auto; }
.wordmark img { height: 26px; width: auto; }
.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}
.nav-links a {
  color: #B7C6D5;
  padding: 6px 0;
  border-bottom: 2px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.nav-links a:hover { color: var(--chalk); }
.nav-links a[aria-current="page"] {
  color: var(--chalk);
  border-bottom-color: var(--rust);
}
.nav-cta {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  background: var(--rust);
  color: var(--chalk);
  padding: 10px 18px;
  border-radius: 2px;
  white-space: nowrap;
  transition: background 0.15s ease;
}
.nav-cta:hover { background: var(--rust-dim); }
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--line-dark);
  color: var(--chalk);
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  padding: 8px 14px;
  border-radius: 2px;
  cursor: pointer;
}

/* ==========================================================================
   SHEET LABEL — the small "SHEET A-01 — Section" tag
   ========================================================================== */
.sheet-label {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 22px;
}
.sheet-label .num { color: var(--rust); font-weight: 600; }
.sheet-label .rule { flex: 0 0 34px; height: 1px; background: currentColor; opacity: 0.5; }
.sheet-label.on-dark { color: #9FB3C6; }
.sheet-label.on-light { color: var(--ink-faint); }
.sheet-label.on-light .num { color: var(--rust); }

/* ==========================================================================
   HERO (home) + PAGE BANNER (interior pages)
   ========================================================================== */
.hero { padding: 56px 0 84px; }
.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
}
.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--rust);
  margin-bottom: 18px;
}
.hero h1 {
  color: var(--chalk);
  font-size: clamp(34px, 4.6vw, 52px);
  margin-bottom: 20px;
}
.hero h1 em {
  font-style: normal;
  color: #9FC2DE;
}
.hero .lede {
  color: #C9D6E3;
  font-size: 17px;
  max-width: 50ch;
  margin-bottom: 34px;
}
.hero-ctas { display: flex; gap: 14px; flex-wrap: wrap; }

.page-banner {
  padding: 64px 0 56px;
}
.page-banner h1 {
  color: var(--chalk);
  font-size: clamp(28px, 4vw, 40px);
  max-width: 22ch;
}
.page-banner p {
  color: #C9D6E3;
  max-width: 56ch;
  font-size: 16px;
  margin-bottom: 0;
}

/* ==========================================================================
   BUTTONS
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  padding: 13px 22px;
  border-radius: 2px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}
.btn-primary { background: var(--rust); color: var(--chalk); }
.btn-primary:hover { background: var(--rust-dim); }
.btn-ghost {
  background: transparent;
  color: var(--chalk);
  border-color: rgba(238,242,245,0.4);
}
.btn-ghost:hover { border-color: var(--chalk); background: rgba(238,242,245,0.06); }

/* ==========================================================================
   STRIP — legislation / notice banner
   ========================================================================== */
.strip {
  background: var(--navy-panel);
  border-top: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
  padding: 13px 0;
}
.strip .wrap {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: baseline;
  font-size: 13.5px;
}
.strip span:first-child {
  font-family: var(--font-mono);
  color: var(--rust);
  letter-spacing: 0.03em;
  font-size: 12px;
}
.strip span:last-child { color: #B7C6D5; }
.strip strong { color: var(--chalk); font-weight: 600; }

/* ==========================================================================
   SECTION SURFACES
   ========================================================================== */
.on-white { background: var(--paper); padding: 88px 0; }
.on-light { background: var(--paper-tint); padding: 88px 0; }
.on-dark  { background: var(--navy-panel); padding: 88px 0; }

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 24px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}
.section-head h2 { font-size: clamp(24px, 3vw, 32px); max-width: 32ch; }
.section-head .note {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--ink-faint);
  margin-bottom: 0;
  max-width: 34ch;
}
.on-dark .section-head { text-align: center; justify-content: center; flex-direction: column; align-items: center; }
.on-dark .section-head .note { color: #B7C6D5; }
.on-dark > .wrap > .btn,
.on-dark > .wrap { text-align: center; }
.on-dark .btn { margin: 0 auto; }

/* ==========================================================================
   ADVANTAGE GRID (home preview cards)
   ========================================================================== */
.adv-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.adv-card {
  background: var(--paper);
  padding: 30px 26px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.adv-card .tag {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--rust);
  letter-spacing: 0.06em;
}
.adv-card .figure {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 600;
  color: var(--navy-deep);
  margin-top: 4px;
}
.adv-card h3 { font-size: 18px; margin-top: 6px; }
.adv-card p { color: var(--ink-soft); font-size: 14.5px; margin-bottom: 0; }

/* ==========================================================================
   MODEL GRID (model / offering cards)
   ========================================================================== */
.model-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.model-card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 26px 22px;
  scroll-margin-top: 100px;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.model-card:hover { border-color: var(--rust); transform: translateY(-2px); }
.model-card .icon {
  width: 30px;
  height: 30px;
  color: var(--rust);
  margin-bottom: 16px;
}
.model-card h3 { font-size: 17px; margin-bottom: 8px; }
.model-card p { color: var(--ink-soft); font-size: 14px; margin-bottom: 0; }
.model-card p a { color: var(--rust); }

/* ==========================================================================
   MEDIA BLOCK — image + text, two column
   ========================================================================== */
.media-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}
.media-block.reverse { direction: rtl; }
.media-block.reverse > * { direction: ltr; }
.media-text {}

/* ==========================================================================
   PHOTO FRAME — captioned image block, drawn like a figure plate
   ========================================================================== */
.photo-frame, .photo-frame-light {
  border: 1px solid var(--line-dark);
  border-radius: 2px;
  overflow: hidden;
}
.photo-frame { background: rgba(238,242,245,0.03); }
.photo-frame-light { background: var(--paper); border-color: var(--line); }
.photo-frame .cap, .photo-frame-light .cap {
  display: flex;
  justify-content: space-between;
  padding: 10px 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.photo-frame .cap { color: #9FB3C6; border-bottom: 1px solid var(--line-dark); }
.photo-frame-light .cap { color: var(--ink-faint); border-bottom: 1px solid var(--line); }
.photo-frame .pad, .photo-frame-light .pad { padding: 14px; }
.photo-frame img, .photo-frame-light img { border-radius: 1px; width: 100%; height: auto; }
.photo-frame video, .photo-frame-light video {
  border-radius: 1px;
  width: 100%;
  height: auto;
  display: block;
  background: #000;
}

/* ==========================================================================
   DATA GRID — spec cells (advantages page, off-grid systems)
   ========================================================================== */
.data-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.data-cell {
  background: var(--paper);
  padding: 22px 22px 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.data-cell .k {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.data-cell .v {
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 600;
  color: var(--navy-deep);
}
.data-cell .u { font-size: 13px; color: var(--ink-soft); }

/* ==========================================================================
   TECH GRID / TECH LIST — indexed spec lists
   ========================================================================== */
.tech-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}
.tech-list-light, .tech-list { display: flex; flex-direction: column; gap: 22px; }
.tech-list-light li, .tech-list li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line);
}
.tech-list li { border-bottom-color: var(--line-dark); }
.tech-list-light li:last-child, .tech-list li:last-child { border-bottom: none; padding-bottom: 0; }
.tech-list-light .idx, .tech-list .idx {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--rust);
  padding-top: 3px;
  min-width: 34px;
}
.tech-list .idx { color: #E08A63; }
.tech-list-light h4 { font-size: 15.5px; margin-bottom: 6px; color: var(--navy-deep); }
.tech-list h4 { font-size: 15.5px; margin-bottom: 6px; color: var(--chalk); }
.tech-list-light p { font-size: 14px; color: var(--ink-soft); margin-bottom: 0; }
.tech-list p { font-size: 14px; color: #B7C6D5; margin-bottom: 0; }

/* ==========================================================================
   PROCESS / STEP — numbered sequence (design-build, technology)
   ========================================================================== */
.process {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.step {
  padding: 24px 20px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--rust);
  border-radius: 2px;
  background: var(--paper);
}
.stepnum {
  display: block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--rust);
  margin-bottom: 12px;
}
.step h4 { font-size: 16px; margin-bottom: 8px; }
.step p { font-size: 14px; color: var(--ink-soft); margin-bottom: 0; }

/* ==========================================================================
   TABLES
   ========================================================================== */
.table-scroll { overflow-x: auto; border: 1px solid var(--line); border-radius: 2px; }
.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14.5px;
  min-width: 560px;
}
.spec-table caption {
  text-align: left;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--ink-faint);
  padding: 14px 18px;
  background: var(--paper-tint);
  border-bottom: 1px solid var(--line);
}
.spec-table th {
  text-align: left;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--ink-faint);
  padding: 12px 18px;
  background: var(--paper-tint);
  border-bottom: 1px solid var(--line);
}
.spec-table td {
  padding: 13px 18px;
  border-bottom: 1px solid var(--line);
  color: var(--ink-soft);
}
.spec-table tr:last-child td { border-bottom: none; }
.spec-table td.model { font-family: var(--font-display); font-weight: 600; color: var(--navy-deep); }
.spec-table td.note { color: var(--ink-faint); font-size: 13.5px; }

/* ==========================================================================
   CONTACT PAGE
   ========================================================================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 40px;
  align-items: start;
}
.form-card {
  background: var(--paper);
  border-radius: 3px;
  padding: 30px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.form-row { display: flex; flex-direction: column; gap: 8px; }
.form-row label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.form-row input, .form-row select, .form-row textarea {
  font-family: var(--font-body);
  font-size: 15px;
  padding: 11px 13px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--paper-tint);
  color: var(--ink);
}
.form-row textarea { min-height: 96px; resize: vertical; }
.form-row input:focus, .form-row select:focus, .form-row textarea:focus {
  outline: 2px solid var(--rust);
  outline-offset: 1px;
  background: var(--paper);
}
.contact-card {
  background: rgba(238,242,245,0.05);
  border: 1px solid rgba(238,242,245,0.18);
  border-radius: 3px;
  padding: 26px 28px;
}
.contact-card dl { margin: 0; display: flex; flex-direction: column; gap: 16px; }
.contact-card dl > div { border-bottom: 1px solid var(--line-dark); padding-bottom: 14px; }
.contact-card dl > div:last-child { border-bottom: none; padding-bottom: 0; }
.contact-card dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #9FB3C6;
  margin-bottom: 4px;
}
.contact-card dd { margin: 0; color: var(--chalk); font-size: 15px; }
.contact-card dd a { color: var(--chalk); border-bottom: 1px solid rgba(238,242,245,0.35); }
.contact-card dd a:hover { border-color: var(--chalk); }

/* ==========================================================================
   FOOTER
   ========================================================================== */
footer {
  background: var(--navy-deep);
  padding: 64px 0 26px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--line-dark);
}
.footer-logo { height: 24px; margin-bottom: 14px; }
.footer-grid h5 {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #9FB3C6;
  margin-bottom: 16px;
}
.footer-grid ul { display: flex; flex-direction: column; gap: 10px; }
.footer-grid ul a { color: #C9D6E3; font-size: 14.5px; }
.footer-grid ul a:hover { color: var(--chalk); }
.footer-bottom {
  padding-top: 22px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: #6E85A0;
  letter-spacing: 0.02em;
}

/* ==========================================================================
   RESPONSIVE
   ========================================================================== */
@media (max-width: 980px) {
  .adv-grid, .model-grid { grid-template-columns: repeat(2, 1fr); }
  .process { grid-template-columns: repeat(2, 1fr); }
  .data-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px 24px; }
}

@media (max-width: 800px) {
  .hero-grid, .media-block, .media-block.reverse, .tech-grid, .contact-grid {
    grid-template-columns: 1fr;
    direction: ltr;
  }
  .hero-grid { gap: 40px; }
  .contact-grid > div:first-child { order: 1; }

  .nav-toggle { display: inline-block; }
  .nav-inner { flex-wrap: wrap; height: auto; padding-top: 14px; padding-bottom: 14px; }
  .nav-links {
    flex-basis: 100%;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    max-height: 0;
    overflow: hidden;
    order: 3;
    transition: max-height 0.2s ease;
  }
  .nav-links.open { max-height: 320px; padding-top: 10px; }
  .nav-links a { width: 100%; padding: 8px 0; }
  .nav-cta { order: 2; }
}

@media (max-width: 640px) {
  .adv-grid, .model-grid, .data-grid, .process { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .section-head { align-items: flex-start; }
  .on-white, .on-light, .on-dark { padding: 56px 0; }
  .hero { padding: 40px 0 56px; }
}