/* ==========================================================================
   Carpent — design system
   Grounded-industrial palette, expressive type, anti-grid organic layout.
   Deliberately not another purple-gradient AI-startup template.
   ========================================================================== */

:root{
  /* Palette: graphite / worn paper / rust (tool & automotive accent) / steel */
  --ink:        #15171B;
  --ink-soft:   #2B2E33;
  --paper:      #F4EFE4;
  --paper-dim:  #E9E2D2;
  --rust:       #C1521F;
  --rust-hot:   #E06A2C;
  --rust-dim:   #8C3B15;
  --steel:      #4C5A63;
  --steel-light:#8B99A0;
  --line:       rgba(21,23,27,0.14);
  --line-soft:  rgba(21,23,27,0.08);
  --on-ink:     #F4EFE4;

  --font-display: "Space Grotesk", "Arial Narrow", sans-serif;
  --font-body:    "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono:    "IBM Plex Mono", ui-monospace, monospace;

  --container: 1180px;
  --radius: 4px;
  --ease: cubic-bezier(.16,.84,.44,1);
}

*, *::before, *::after{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }

body{
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

h1,h2,h3,h4{
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.02;
  letter-spacing: -0.02em;
  margin: 0 0 0.4em;
}

.eyebrow{
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--rust-dim);
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 1.1em;
}
.eyebrow::before{
  content:"";
  width: 22px; height: 1px;
  background: var(--rust);
  display:inline-block;
}

p{ margin: 0 0 1em; color: var(--ink-soft); max-width: 62ch; }
.lede{ font-size: 1.2rem; color: var(--ink-soft); }

.container{
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 28px;
}

section{ position: relative; }

/* ---------- buttons ---------- */
.btn{
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 15px 26px;
  border-radius: var(--radius);
  border: 1px solid var(--ink);
  transition: transform .25s var(--ease), background .25s var(--ease), color .25s var(--ease), box-shadow .25s var(--ease);
  cursor: pointer;
  background: transparent;
}
.btn-primary{
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}
.btn-primary:hover{
  background: var(--rust);
  border-color: var(--rust);
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(193,82,31,0.28);
}
.btn-ghost{ color: var(--ink); border-color: var(--line); }
.btn-ghost:hover{ border-color: var(--ink); transform: translateY(-2px); }
.btn-on-ink{ color: var(--paper); border-color: rgba(244,239,228,0.4); }
.btn-on-ink:hover{ background: var(--rust); border-color: var(--rust); transform: translateY(-2px); }
.btn-arrow{ transition: transform .25s var(--ease); }
.btn:hover .btn-arrow{ transform: translateX(4px); }

/* ---------- nav ---------- */
.site-nav{
  position: sticky; top:0; z-index: 100;
  background: rgba(244,239,228,0.86);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line-soft);
}
.site-nav .container{
  display:flex; align-items:center; justify-content:space-between;
  height: 76px;
}
.brand{
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.3rem;
  text-decoration:none;
  color: var(--ink);
  letter-spacing: -0.02em;
  display:flex; align-items:center; gap:8px;
}
.brand .dot{ color: var(--rust); }
.nav-links{
  display:flex; align-items:center; gap: 34px;
  list-style:none; margin:0; padding:0;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.nav-links a{
  text-decoration:none; color: var(--ink-soft);
  position: relative; padding-bottom: 4px;
}
.nav-links a::after{
  content:""; position:absolute; left:0; bottom:0;
  width:0; height:1px; background: var(--rust);
  transition: width .25s var(--ease);
}
.nav-links a:hover::after, .nav-links a.active::after{ width:100%; }
.nav-links a.active{ color: var(--ink); }
.nav-cta{ display:flex; align-items:center; gap: 22px; }
.nav-toggle{ display:none; }

@media (max-width: 860px){
  .nav-links{
    position: fixed; inset: 76px 0 0 0;
    background: var(--paper);
    flex-direction: column;
    justify-content: flex-start;
    padding: 40px 28px;
    gap: 28px;
    font-size: 1rem;
    transform: translateX(100%);
    transition: transform .35s var(--ease);
  }
  .nav-links.open{ transform: translateX(0); }
  .nav-toggle{
    display:flex; flex-direction:column; gap:5px;
    background:none; border:none; cursor:pointer; padding: 8px;
  }
  .nav-toggle span{ width: 22px; height:2px; background: var(--ink); }
  .nav-cta .btn-ghost{ padding: 10px 14px; font-size: 0.76rem; }
}
@media (max-width: 400px){
  .nav-cta .btn-ghost{ display:none; }
}

/* ---------- hero ---------- */
.hero{
  padding: 100px 0 120px;
  position: relative;
  overflow: hidden;
}
.hero-grid{
  display:grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 60px;
  align-items: end;
}
.hero h1{
  font-size: clamp(2.6rem, 6vw, 5rem);
  max-width: 14ch;
}
.hero h1 em{
  font-style: normal;
  color: var(--rust);
}
.hero-side{
  font-family: var(--font-mono);
  font-size: 0.92rem;
  color: var(--ink-soft);
  border-left: 1px solid var(--line);
  padding-left: 24px;
  align-self: end;
  padding-bottom: 6px;
}
.hero-actions{ display:flex; gap:16px; margin-top: 40px; flex-wrap:wrap; }

.hero-blob{
  position: absolute;
  top: -160px; right: -180px;
  width: 620px; height: 620px;
  border-radius: 44% 56% 62% 38% / 42% 46% 54% 58%;
  background: radial-gradient(circle at 32% 28%, var(--rust-hot), var(--rust) 55%, var(--rust-dim) 100%);
  opacity: 0.16;
  filter: blur(2px);
  animation: blob-float 14s var(--ease) infinite alternate;
  z-index: -1;
}
@keyframes blob-float{
  0%{ transform: translate(0,0) rotate(0deg) scale(1); }
  100%{ transform: translate(-40px, 30px) rotate(12deg) scale(1.06); }
}

/* ---------- section scaffolding ---------- */
.section{ padding: 108px 0; border-top: 1px solid var(--line-soft); }
.section-ink{ background: var(--ink); color: var(--on-ink); }
.section-ink p{ color: rgba(244,239,228,0.72); }
.section-ink .eyebrow{ color: var(--rust-hot); }
.section-head{
  display:grid; grid-template-columns: 1.1fr 0.9fr; gap: 60px;
  margin-bottom: 64px; align-items: end;
}
.section-head h2{ font-size: clamp(2rem, 4vw, 2.9rem); max-width: 16ch; }

/* ---------- reveal-on-scroll ---------- */
.reveal{
  opacity: 0;
  transform: translateY(28px);
  transition: opacity .8s var(--ease), transform .8s var(--ease);
}
.reveal.is-visible{ opacity: 1; transform: translateY(0); }
.reveal-stagger > *{ transition-delay: calc(var(--i,0) * 90ms); }

/* ---------- cards / grids ---------- */
.grid-3{ display:grid; grid-template-columns: repeat(3,1fr); gap: 28px; }
.grid-2{ display:grid; grid-template-columns: repeat(2,1fr); gap: 28px; }
.grid-4{ display:grid; grid-template-columns: repeat(4,1fr); gap: 24px; }
@media (max-width: 1080px){ .grid-4{ grid-template-columns: repeat(2,1fr); } }

.card{
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 34px 28px;
  background: rgba(255,255,255,0.35);
  transition: transform .3s var(--ease), border-color .3s var(--ease), box-shadow .3s var(--ease);
}
.card:hover{
  transform: translateY(-6px);
  border-color: var(--rust);
  box-shadow: 0 18px 40px rgba(21,23,27,0.08);
}
.card .num{
  font-family: var(--font-mono);
  color: var(--rust-dim);
  font-size: 0.85rem;
  display:block;
  margin-bottom: 18px;
}
.card h3{ font-size: 1.25rem; margin-bottom: 0.5em; }
.card p{ font-size: 0.96rem; margin-bottom: 0; }

/* ---------- tier cards ---------- */
.tier{
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 38px 30px;
  display:flex; flex-direction:column; gap: 18px;
  background: var(--paper);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease);
}
.tier:hover{ transform: translateY(-6px); box-shadow: 0 18px 44px rgba(21,23,27,0.1); }
.tier.featured{ border-color: var(--ink); background: var(--ink); color: var(--on-ink); }
.tier.featured p{ color: rgba(244,239,228,0.72); }
.tier.featured .tier-name{ color: var(--rust-hot); }
.tier-name{
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.82rem;
  color: var(--rust-dim);
}
.tier h3{ font-size: 1.5rem; }
.tier ul{ list-style:none; margin: 0; padding:0; display:flex; flex-direction:column; gap: 10px; font-size: 0.92rem; }
.tier li{ padding-left: 18px; position:relative; color: var(--ink-soft); }
.tier.featured li{ color: rgba(244,239,228,0.8); }
.tier li::before{ content:"—"; position:absolute; left:0; color: var(--rust); }

/* ---------- friction finder widget ---------- */
.finder{
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 44px;
  background: rgba(255,255,255,0.5);
}
.finder-prompt{ font-family: var(--font-mono); font-size: 0.85rem; color: var(--steel); margin-bottom: 20px; }
.finder-pills{ display:flex; flex-wrap:wrap; gap: 10px; margin-bottom: 30px; }
.pill{
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.03em;
  padding: 10px 18px;
  border: 1px solid var(--line);
  border-radius: 100px;
  background: transparent;
  cursor: pointer;
  transition: all .2s var(--ease);
}
.pill:hover{ border-color: var(--rust-hot); color: var(--rust-hot); }
.pill.active{ background: var(--ink); color: var(--paper); border-color: var(--ink); }
.finder-output{
  border-top: 1px solid var(--line);
  padding-top: 26px;
  min-height: 108px;
}
.finder-output .tag{
  font-family: var(--font-mono); font-size: 0.78rem; text-transform: uppercase;
  letter-spacing: 0.1em; color: var(--rust-hot); display:block; margin-bottom: 10px;
}
.finder-output p{ font-size: 1.02rem; color: var(--ink); margin-bottom: 0; }
.finder-output .cursor{
  display:inline-block; width: 8px; height: 1em; background: var(--rust);
  animation: blink 1s step-end infinite; vertical-align: -2px; margin-left: 2px;
}
@keyframes blink{ 50%{ opacity:0; } }

/* ---------- workflow diagram ---------- */
.flow{ display:flex; align-items:center; gap: 0; flex-wrap: wrap; margin-top: 40px; }
.flow-step{
  font-family: var(--font-mono); font-size: 0.82rem;
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 16px 20px; background: rgba(255,255,255,0.5);
  display:flex; flex-direction:column; gap:6px; min-width: 150px;
}
.section-ink .flow-step{ background: rgba(244,239,228,0.05); border-color: rgba(244,239,228,0.18); }
.flow-step .label{ color: var(--rust-dim); text-transform:uppercase; letter-spacing:.08em; font-size:0.72rem; }
.section-ink .flow-step .label{ color: var(--rust-hot); }
.flow-arrow{ flex: 0 0 auto; width: 44px; height: 1px; background: var(--line); position: relative; margin: 0 6px; }
.section-ink .flow-arrow{ background: rgba(244,239,228,0.25); }
.flow-arrow::after{
  content:""; position:absolute; right:0; top:-3px;
  border: 3px solid transparent; border-left-color: var(--rust);
}
.flow-pulse{
  position:absolute; top:-2px; left:0; width:6px; height:5px; border-radius:50%;
  background: var(--rust); animation: pulse-run 2.6s linear infinite;
}
@keyframes pulse-run{
  0%{ left:0; opacity:0; } 8%{ opacity:1; } 92%{ opacity:1; } 100%{ left: calc(100% - 6px); opacity:0; }
}

/* ---------- stat / status strip ---------- */
.status-strip{
  display:flex; flex-wrap:wrap; gap: 40px;
  font-family: var(--font-mono); font-size: 0.82rem;
  color: var(--steel-light);
  padding: 22px 0; border-top:1px solid var(--line); border-bottom:1px solid var(--line);
}
.status-strip .dot-live{
  display:inline-block; width:7px; height:7px; border-radius:50%;
  background: var(--rust); margin-right: 8px;
  box-shadow: 0 0 0 rgba(193,82,31,0.5);
  animation: live-ping 2s var(--ease) infinite;
}
@keyframes live-ping{
  0%{ box-shadow: 0 0 0 0 rgba(193,82,31,0.45); }
  70%{ box-shadow: 0 0 0 8px rgba(193,82,31,0); }
  100%{ box-shadow: 0 0 0 0 rgba(193,82,31,0); }
}

/* ---------- quote / bio ---------- */
.bio-grid{ display:grid; grid-template-columns: 0.8fr 1.2fr; gap: 64px; align-items:start; }
.bio-photo{
  aspect-ratio: 4/5;
  border-radius: var(--radius);
  background: linear-gradient(160deg, var(--steel), var(--ink));
  position: relative;
  overflow: hidden;
  display:flex; align-items:flex-end; padding: 24px;
}
.bio-photo .cap{ font-family: var(--font-mono); color: rgba(244,239,228,0.7); font-size: 0.78rem; }
.pull-quote{
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 2.4vw, 2rem);
  line-height: 1.2;
  font-weight: 500;
  color: var(--ink);
  border-left: 3px solid var(--rust);
  padding-left: 26px;
  margin: 34px 0;
}

/* ---------- timeline (approach page) ---------- */
.timeline{ display:flex; flex-direction:column; }
.tl-row{
  display:grid; grid-template-columns: 90px 1fr; gap: 30px;
  padding: 34px 0; border-top: 1px solid var(--line);
}
.tl-row:last-child{ border-bottom: 1px solid var(--line); }
.tl-index{ font-family: var(--font-mono); font-size: 0.85rem; color: var(--rust); padding-top: 4px; }
.tl-body h3{ font-size: 1.4rem; margin-bottom: 0.35em; }
.tl-body p{ max-width: 60ch; }

/* ---------- CTA band ---------- */
.cta-band{
  border-radius: var(--radius);
  background: var(--ink);
  color: var(--on-ink);
  padding: 72px 56px;
  display:grid; grid-template-columns: 1.3fr 0.7fr; gap: 40px; align-items:center;
  position: relative; overflow:hidden;
}
.cta-band h2{ font-size: clamp(1.8rem, 3.4vw, 2.6rem); max-width: 16ch; }
.cta-band p{ color: rgba(244,239,228,0.72); }

/* ---------- footer ---------- */
.site-footer{ padding: 60px 0 40px; border-top: 1px solid var(--line); }
.footer-grid{ display:flex; justify-content:space-between; align-items:flex-end; flex-wrap:wrap; gap: 30px; }
.footer-links{ display:flex; gap: 24px; list-style:none; margin:0; padding:0; font-family: var(--font-mono); font-size:0.82rem; }
.footer-links a{ text-decoration:none; color: var(--ink-soft); }
.footer-links a:hover{ color: var(--rust-dim); }
.footer-meta{ font-family: var(--font-mono); font-size: 0.76rem; color: var(--steel-light); margin-top: 30px; }

/* ---------- tool chips ---------- */
.tool-chips{ display:flex; flex-wrap:wrap; gap: 14px; margin-top: 40px; }
.tool-chip{
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  padding: 16px 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255,255,255,0.4);
  transition: transform .25s var(--ease), border-color .25s var(--ease);
}
.tool-chip:hover{ transform: translateY(-3px); border-color: var(--rust); }
.tool-chip.more{
  font-family: var(--font-mono); font-weight: 400; font-size: 0.86rem;
  color: var(--steel); border-style: dashed; background: transparent;
}

/* ---------- fit checklist ---------- */
.fit-grid{ display:grid; grid-template-columns: 1fr 1fr; gap: 28px; margin-top: 40px; }
.fit-col{
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 30px 28px;
}
.fit-col.yes{ border-color: var(--rust-dim); }
.fit-col h3{ font-size: 1.05rem; margin-bottom: 0.8em; }
.fit-col.yes h3{ color: var(--rust-dim); }
.fit-col.no h3{ color: var(--steel); }
.fit-col ul{ list-style:none; margin:0; padding:0; display:flex; flex-direction:column; gap: 12px; }
.fit-col li{ padding-left: 24px; position:relative; font-size: 0.96rem; color: var(--ink-soft); }
.fit-col.yes li::before{ content:"✓"; position:absolute; left:0; color: var(--rust-dim); font-family: var(--font-mono); }
.fit-col.no li::before{ content:"—"; position:absolute; left:0; color: var(--steel-light); font-family: var(--font-mono); }

/* ---------- FAQ ---------- */
.faq{ max-width: 78ch; }
.faq-item{
  border-top: 1px solid var(--line);
  padding: 22px 0;
}
.faq-item:last-child{ border-bottom: 1px solid var(--line); }
.faq-item summary{
  cursor: pointer;
  list-style: none;
  display:flex; align-items:center; justify-content:space-between; gap: 20px;
  font-family: var(--font-display); font-weight: 500; font-size: 1.05rem;
  color: var(--ink);
}
.faq-item summary::-webkit-details-marker{ display:none; }
.faq-item summary::after{
  content:"+"; font-family: var(--font-mono); font-size: 1.2rem; color: var(--rust);
  flex: 0 0 auto; transition: transform .2s var(--ease);
}
.faq-item[open] summary::after{ content:"—"; }
.faq-item p{ margin-top: 14px; margin-bottom: 0; font-size: 0.98rem; }

/* ---------- form success state ---------- */
.form-success{
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 44px;
  background: rgba(255,255,255,0.5);
}
.form-success .tag{
  font-family: var(--font-mono); font-size: 0.78rem; text-transform: uppercase;
  letter-spacing: 0.1em; color: var(--rust-dim); display:block; margin-bottom: 10px;
}
.form-success p{ font-size: 1.05rem; color: var(--ink); margin-bottom: 0; }

/* ---------- form ---------- */
.form-grid{ display:grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.field{ display:flex; flex-direction:column; gap: 8px; margin-bottom: 20px; }
.field.full{ grid-column: 1 / -1; }
.field label{ font-family: var(--font-mono); font-size: 0.78rem; text-transform:uppercase; letter-spacing:.06em; color: var(--steel); }
.field input, .field select, .field textarea{
  font-family: var(--font-body); font-size: 1rem;
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 14px 16px; background: rgba(255,255,255,0.5); color: var(--ink);
}
.field input:focus, .field select:focus, .field textarea:focus{
  outline: none; border-color: var(--rust);
}

/* ---------- responsive ---------- */
@media (max-width: 900px){
  .hero-grid, .section-head, .bio-grid, .cta-band, .form-grid, .fit-grid{
    grid-template-columns: 1fr;
  }
  .hero-side{ border-left:none; border-top:1px solid var(--line); padding-left:0; padding-top:20px; }
  .grid-3, .grid-2, .grid-4{ grid-template-columns: 1fr; }
  .section{ padding: 76px 0; }
  .cta-band{ padding: 48px 30px; }
}

/* utility */
.mt-0{ margin-top:0; }
.text-center{ text-align:center; }
.max-w{ max-width: 68ch; }
.center-col{ margin-left:auto; margin-right:auto; text-align:center; }