/* ============================================================
   MODULAR ROOST — Design tokens
   Limewash background, charcoal ink, cedar + moss accents.
   Display: Space Grotesk · Body: IBM Plex Sans · Utility: IBM Plex Mono
   ============================================================ */

:root {
  --limewash: #F3F0E9;
  --limewash-dim: #ECE8DE;
  --charcoal: #211F1C;
  --charcoal-soft: #4A4742;
  --cedar: #B9743E;
  --cedar-deep: #9C5F2F;
  --moss: #54624A;
  --moss-deep: #3E4838;
  --concrete: #C7C1B3;
  --concrete-line: #D9D4C7;
  --white: #FCFBF8;

  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'IBM Plex Sans', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;

  --unit: 1px;
  --module: 8px;
  --radius: 3px;
  --max-w: 1180px;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
}

body {
  margin: 0;
  background: var(--limewash);
  color: var(--charcoal);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

a { color: inherit; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0;
  color: var(--charcoal);
}

p { margin: 0; }

button { font-family: inherit; cursor: pointer; }

:focus-visible {
  outline: 2px solid var(--cedar);
  outline-offset: 3px;
}

.wrap {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 32px;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cedar-deep);
  display: flex;
  align-items: center;
  gap: 10px;
}

.eyebrow::before {
  content: "";
  width: 16px;
  height: 1px;
  background: var(--cedar-deep);
  display: inline-block;
}

/* ---------------- NAV ---------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(243, 240, 233, 0.92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--concrete-line);
}

.nav {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 18px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  letter-spacing: -0.01em;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-mark {
  width: 22px;
  height: 22px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  gap: 2px;
}
.logo-mark span { background: var(--charcoal); }
.logo-mark span:nth-child(2) { background: var(--cedar); }
.logo-mark span:nth-child(3) { background: var(--moss); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 34px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.03em;
  text-decoration: none;
  color: var(--charcoal-soft);
  position: relative;
  padding-bottom: 3px;
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 0%;
  height: 1px;
  background: var(--cedar);
  transition: width 0.25s var(--ease);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.nav-links a.active { color: var(--charcoal); }

.nav-cta {
  font-family: var(--font-mono);
  font-size: 13px;
  background: var(--charcoal);
  color: var(--limewash);
  border: none;
  padding: 10px 18px;
  border-radius: var(--radius);
  text-decoration: none;
  transition: background 0.2s var(--ease), transform 0.2s var(--ease);
  display: inline-block;
}
.nav-cta:hover { background: var(--cedar-deep); transform: translateY(-1px); }

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--concrete);
  border-radius: var(--radius);
  width: 38px;
  height: 38px;
  align-items: center;
  justify-content: center;
}
.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  content: "";
  display: block;
  width: 16px;
  height: 1.5px;
  background: var(--charcoal);
  position: relative;
}
.nav-toggle span::before { position: absolute; top: -5px; }
.nav-toggle span::after { position: absolute; top: 5px; }

/* ---------------- BUTTONS ---------------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 13.5px;
  letter-spacing: 0.02em;
  text-decoration: none;
  padding: 13px 22px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  transition: transform 0.2s var(--ease), background 0.2s var(--ease), border-color 0.2s var(--ease);
}

.btn-primary {
  background: var(--cedar);
  color: var(--white);
}
.btn-primary:hover { background: var(--cedar-deep); transform: translateY(-2px); }

.btn-ghost {
  border-color: var(--charcoal);
  color: var(--charcoal);
}
.btn-ghost:hover { background: var(--charcoal); color: var(--limewash); transform: translateY(-2px); }

.btn-light {
  border-color: var(--concrete);
  color: var(--charcoal);
}
.btn-light:hover { border-color: var(--charcoal); }

/* ---------------- SECTION RHYTHM ---------------- */

section { padding: 96px 0; }
section.tight { padding: 64px 0; }
.border-top { border-top: 1px solid var(--concrete-line); }
.on-dim { background: var(--limewash-dim); }
.on-charcoal { background: var(--charcoal); color: var(--limewash); }
.on-charcoal h1, .on-charcoal h2, .on-charcoal h3 { color: var(--limewash); }
.on-charcoal .eyebrow { color: var(--cedar); }
.on-charcoal .eyebrow::before { background: var(--cedar); }

/* ---------------- MODULE UNIT (signature device) ---------------- */
/* The recurring "kit of parts" block used across hero, philosophy,
   process, and quote pages. */

.module {
  border: 1.5px solid var(--charcoal);
  border-radius: var(--radius);
  background: var(--white);
  position: relative;
}

.module-dim {
  position: absolute;
  bottom: 6px;
  right: 8px;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--charcoal-soft);
  letter-spacing: 0.02em;
}

/* ---------------- REVEAL ---------------- */

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-group .reveal:nth-child(2) { transition-delay: 0.08s; }
.reveal-group .reveal:nth-child(3) { transition-delay: 0.16s; }
.reveal-group .reveal:nth-child(4) { transition-delay: 0.24s; }

/* ---------------- FOOTER ---------------- */

.site-footer {
  background: var(--charcoal);
  color: var(--concrete);
  padding: 64px 0 28px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 48px;
  border-bottom: 1px solid #3a382f;
}

.footer-grid h4 {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--limewash);
  margin-bottom: 16px;
}

.footer-grid p, .footer-grid a {
  color: var(--concrete);
  font-size: 14px;
  text-decoration: none;
  display: block;
  margin-bottom: 10px;
  line-height: 1.5;
}
.footer-grid a:hover { color: var(--cedar); }

.footer-logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  color: var(--limewash);
  margin-bottom: 14px;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 24px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--charcoal-soft);
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------------- SHARED PAGE HERO (interior pages) ---------------- */

.page-hero {
  padding: 64px 0 56px;
  border-bottom: 1px solid var(--concrete-line);
}

.page-hero h1 {
  font-size: clamp(36px, 5vw, 56px);
  line-height: 1.05;
  margin-top: 18px;
  max-width: 760px;
}

.page-hero .lede {
  margin-top: 22px;
  max-width: 560px;
  font-size: 17px;
  color: var(--charcoal-soft);
}

/* ---------------- UTILITY ---------------- */

.mono { font-family: var(--font-mono); }
.center { text-align: center; }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mt-48 { margin-top: 48px; }
.mt-64 { margin-top: 64px; }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }

/* ---------------- CONFIGURATOR (signature element) ---------------- */

.configurator {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 28px;
  margin-top: 48px;
  align-items: stretch;
}

.module-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.module-block {
  background: var(--white);
  border: 1.5px solid var(--concrete);
  border-radius: var(--radius);
  padding: 18px 16px 16px;
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 28px;
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease), box-shadow 0.2s var(--ease);
  min-height: 104px;
}

.module-block:hover { transform: translateY(-2px); border-color: var(--charcoal); }

.module-block.is-active {
  border-color: var(--charcoal);
  box-shadow: inset 0 0 0 1px var(--charcoal);
  background: var(--charcoal);
}

.module-block.is-active .mb-name { color: var(--limewash); }
.module-block.is-active .mb-spec { color: var(--concrete); }
.module-block.is-active .mb-check { opacity: 1; transform: scale(1); }

.mb-top { display: flex; align-items: flex-start; justify-content: space-between; }

.mb-name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 16px;
}

.mb-spec {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--charcoal-soft);
  letter-spacing: 0.01em;
}

.mb-check {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--cedar);
  opacity: 0;
  transform: scale(0.5);
  transition: all 0.2s var(--ease);
  flex-shrink: 0;
}

.configurator-readout {
  background: var(--white);
  border: 1.5px solid var(--charcoal);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  flex-direction: column;
}

.readout-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 12px 0;
  border-bottom: 1px solid var(--concrete-line);
  font-family: var(--font-mono);
}

.readout-row:first-child { padding-top: 0; }

.readout-row span {
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--charcoal-soft);
}

.readout-row strong {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 600;
}

.plan-preview {
  margin-top: 18px;
  height: 46px;
  border: 1px solid var(--concrete);
  border-radius: var(--radius);
  display: flex;
  overflow: hidden;
}

/* ---------------- CARDS ---------------- */

.model-card {
  border: 1px solid var(--concrete);
  border-radius: var(--radius);
  background: var(--white);
  overflow: hidden;
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}
.model-card:hover { border-color: var(--charcoal); transform: translateY(-3px); }

.model-card-render {
  height: 150px;
  position: relative;
  overflow: hidden;
}

.model-card-body { padding: 22px; }

.model-card-body h3 { font-size: 19px; }

.model-card-body .desc {
  margin-top: 8px;
  font-size: 14px;
  color: var(--charcoal-soft);
}

.model-spec-table {
  margin-top: 18px;
  font-family: var(--font-mono);
  font-size: 12px;
}

.model-spec-table div {
  display: flex;
  justify-content: space-between;
  padding: 7px 0;
  border-top: 1px solid var(--concrete-line);
  color: var(--charcoal-soft);
}
.model-spec-table div strong { color: var(--charcoal); font-weight: 500; }

.module-chips { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 14px; }
.module-chip {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.03em;
  padding: 4px 9px;
  border-radius: 20px;
  border: 1px solid var(--concrete);
  color: var(--charcoal-soft);
}

/* ---------------- PRINCIPLE CARDS ---------------- */

.principle-card {
  background: var(--white);
  border: 1px solid var(--concrete);
  border-radius: var(--radius);
  padding: 28px;
}

.principle-mark {
  width: 28px;
  height: 28px;
  background: var(--cedar);
  border-radius: var(--radius);
  margin-bottom: 20px;
}

.principle-card h3 { font-size: 18px; margin-bottom: 10px; }
.principle-card p { font-size: 14.5px; color: var(--charcoal-soft); }

/* ---------------- PROCESS TIMELINE ---------------- */

.process-list {
  position: relative;
  margin-top: 56px;
}

.process-step {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 32px;
  padding: 36px 0;
  border-top: 1px solid var(--concrete-line);
  position: relative;
}
.process-step:first-child { border-top: 1px solid var(--charcoal); }

.process-num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--cedar-deep);
  padding-top: 4px;
}

.process-step h3 {
  font-size: 24px;
  display: flex;
  align-items: baseline;
  gap: 16px;
}

.process-duration {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--charcoal-soft);
  font-weight: 400;
}

.process-step p {
  margin-top: 12px;
  max-width: 600px;
  color: var(--charcoal-soft);
  font-size: 15px;
}

/* ---------------- ABSTRACT RENDERS (CSS "photography") ---------------- */

.render-a { background: linear-gradient(135deg, #C7C1B3 0%, #54624A 55%, #211F1C 100%); }
.render-b { background: linear-gradient(160deg, #B9743E 0%, #9C5F2F 50%, #211F1C 100%); }
.render-c { background: linear-gradient(145deg, #54624A 0%, #211F1C 70%); }
.render-d { background: linear-gradient(120deg, #D9D4C7 0%, #B9743E 60%, #3E4838 100%); }

.render-grain {
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(0deg, rgba(252,251,248,0.05) 0px, transparent 1px, transparent 3px);
  mix-blend-mode: overlay;
}

.render-frame {
  position: absolute;
  inset: 14px;
  border: 1px solid rgba(252,251,248,0.35);
}

.render-tag {
  position: absolute;
  bottom: 12px;
  left: 12px;
  font-family: var(--font-mono);
  font-size: 10px;
  color: #FCFBF8;
  letter-spacing: 0.04em;
  z-index: 2;
}

/* ---------------- CASE STUDIES ---------------- */

.case-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
  padding: 72px 0;
}
.case-block:not(:last-child) { border-bottom: 1px solid var(--concrete-line); }
.case-block.flip .case-render { order: 2; }

.case-render {
  height: 360px;
  border-radius: var(--radius);
  position: relative;
  overflow: hidden;
}

.case-stats {
  display: flex;
  gap: 28px;
  margin-top: 28px;
  flex-wrap: wrap;
}

.case-stat strong {
  display: block;
  font-family: var(--font-display);
  font-size: 24px;
}
.case-stat span {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--charcoal-soft);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.pull-quote {
  margin-top: 28px;
  padding-left: 18px;
  border-left: 2px solid var(--cedar);
  font-family: var(--font-display);
  font-size: 17px;
  line-height: 1.5;
  color: var(--charcoal);
}
.pull-quote cite {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-style: normal;
  color: var(--charcoal-soft);
}

/* ---------------- FAQ ---------------- */

.faq-item {
  border-top: 1px solid var(--concrete-line);
  padding: 6px 0;
}
.faq-item:last-child { border-bottom: 1px solid var(--concrete-line); }

.faq-item summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 16.5px;
}
.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 400;
  color: var(--cedar-deep);
  transition: transform 0.2s var(--ease);
  flex-shrink: 0;
  margin-left: 16px;
}
.faq-item[open] summary::after { transform: rotate(45deg); }

.faq-item p {
  padding-bottom: 20px;
  max-width: 640px;
  font-size: 14.5px;
  color: var(--charcoal-soft);
}

/* ---------------- SPEC TABLE (materials) ---------------- */

.spec-table { margin-top: 24px; border-top: 1px solid var(--concrete-line); }
.spec-row {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 24px;
  padding: 16px 0;
  border-bottom: 1px solid var(--concrete-line);
  font-size: 14.5px;
}
.spec-row .label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--cedar-deep);
}
.spec-row .value { color: var(--charcoal-soft); }

/* ---------------- FORM ---------------- */

.quote-form { display: flex; flex-direction: column; gap: 20px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }

.field { display: flex; flex-direction: column; gap: 8px; }
.field label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--charcoal-soft);
}
.field input, .field textarea, .field select {
  font-family: var(--font-body);
  font-size: 15px;
  padding: 13px 14px;
  border: 1.5px solid var(--concrete);
  border-radius: var(--radius);
  background: var(--white);
  color: var(--charcoal);
  resize: vertical;
}
.field input:focus, .field textarea:focus, .field select:focus {
  border-color: var(--charcoal);
  outline: none;
}

.form-note {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--charcoal-soft);
}

.form-success {
  display: none;
  border: 1.5px solid var(--moss);
  background: rgba(84, 98, 74, 0.08);
  color: var(--moss-deep);
  padding: 16px 18px;
  border-radius: var(--radius);
  font-size: 14px;
}
.form-success.show { display: block; }

/* ---------------- RESPONSIVE ---------------- */

@media (max-width: 880px) {
  .nav-links, .nav-cta { display: none; }
  .nav-toggle { display: flex; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  section { padding: 64px 0; }
  .configurator { grid-template-columns: 1fr; }
  .case-block { grid-template-columns: 1fr; gap: 28px; }
  .case-block.flip .case-render { order: 0; }
  .case-render { height: 260px; }
  .form-row { grid-template-columns: 1fr; }
  .process-step { grid-template-columns: 1fr; gap: 8px; }
}

@media (max-width: 880px) {
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--limewash);
    border-bottom: 1px solid var(--concrete-line);
    padding: 24px 32px;
    gap: 20px;
  }
  .nav-cta.open { display: inline-block; margin: 0 32px 24px; }
}

@media (max-width: 560px) {
  .wrap { padding: 0 20px; }
  .nav { padding: 16px 20px; }
  section { padding: 56px 0; }
}