/* ==========================================================================
   Pi Consulting — design system
   Precision-driven identity: near-black ink on cool paper, one amber accent,
   condensed technical display type, hairline structure, pi-digit motif.
   ========================================================================== */

:root {
  /* -- palette (light) -- */
  --paper: #eff0ea;
  --paper-raised: #ffffff;
  --ink: #14161a;
  --ink-dim: #5c6058;
  --line: #d6d8cf;
  --line-strong: #b9bcb1;
  --accent: #b8720a;
  --accent-ink: #ffffff;
  --accent-wash: #f5e6cd;
  --shadow: 0 1px 2px rgba(20, 22, 26, 0.05), 0 10px 30px -18px rgba(20, 22, 26, 0.25);

  /* -- type -- */
  --font-display: "Big Shoulders Display", "Arial Narrow", sans-serif;
  --font-body: "Public Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;

  /* -- rhythm -- */
  --container: 1120px;
  --gutter: clamp(20px, 5vw, 56px);
  --radius: 3px;

  /* -- motion (from Emil Kowalski's animation rules) -- */
  --ease-out: cubic-bezier(0.23, 1, 0.32, 1);
  --ease-in-out: cubic-bezier(0.77, 0, 0.175, 1);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #14161a;
    --paper-raised: #1b1e20;
    --ink: #edede4;
    --ink-dim: #9a9e97;
    --line: #2c2f2a;
    --line-strong: #40443d;
    --accent: #e3a83b;
    --accent-ink: #14161a;
    --accent-wash: #332a15;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 10px 30px -18px rgba(0, 0, 0, 0.6);
  }
}

:root[data-theme="dark"] {
  --paper: #14161a;
  --paper-raised: #1b1e20;
  --ink: #edede4;
  --ink-dim: #9a9e97;
  --line: #2c2f2a;
  --line-strong: #40443d;
  --accent: #e3a83b;
  --accent-ink: #14161a;
  --accent-wash: #332a15;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 10px 30px -18px rgba(0, 0, 0, 0.6);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.skip-link {
  position: absolute;
  top: -60px;
  left: 12px;
  z-index: 100;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 13px;
  padding: 10px 16px;
  border-radius: var(--radius);
  text-decoration: none;
  transition: top 160ms var(--ease-out);
}
.skip-link:focus {
  top: 12px;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.01em;
  text-wrap: balance;
  margin: 0;
}

p { margin: 0; }

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* -- pi-digit ambient texture -- */
.pi-texture {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
  z-index: 0;
}
.pi-texture span {
  position: absolute;
  font-family: var(--font-mono);
  font-size: clamp(120px, 22vw, 320px);
  font-weight: 500;
  color: var(--ink);
  opacity: 0.035;
  white-space: nowrap;
  letter-spacing: 0.04em;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) rotate(-2deg);
}

/* -- crosshair / tick corner mark -- */
.tick {
  position: relative;
}
.tick::before, .tick::after {
  content: "";
  position: absolute;
  width: 9px;
  height: 9px;
  border-top: 1.5px solid var(--line-strong);
  opacity: 0.9;
}
.tick::before { top: 0; left: 0; border-left: 1.5px solid var(--line-strong); }
.tick::after  { top: 0; right: 0; border-right: 1.5px solid var(--line-strong); }

/* ==========================================================================
   Header / nav
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.site-header .bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.wordmark {
  display: flex;
  align-items: baseline;
  gap: 6px;
  font-family: var(--font-display);
  font-size: 22px;
  text-transform: none;
  text-decoration: none;
  color: var(--ink);
  letter-spacing: 0;
}
.wordmark .pi-glyph {
  font-family: var(--font-mono);
  font-size: 22px;
  color: var(--accent);
  font-weight: 600;
}

.nav-links {
  display: flex;
  gap: 32px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-links a {
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-dim);
  transition: color 160ms ease;
  padding: 4px 0;
  border-bottom: 1.5px solid transparent;
}
.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--ink);
  border-bottom-color: var(--accent);
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--ink);
}

@media (max-width: 760px) {
  .nav-toggle { display: flex; }
  .nav-links {
    position: fixed;
    inset: 68px 0 0 0;
    background: var(--paper);
    flex-direction: column;
    gap: 0;
    padding: 8px var(--gutter) 40px;
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: transform 220ms var(--ease-out), opacity 220ms var(--ease-out);
  }
  .nav-links[data-open="true"] {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .nav-links li { border-bottom: 1px solid var(--line); }
  .nav-links a { display: block; padding: 16px 0; font-size: 14px; }
}

/* ==========================================================================
   Hero
   ========================================================================== */

.hero {
  position: relative;
  border-bottom: 1px solid var(--line);
  padding: clamp(64px, 12vw, 128px) 0 clamp(48px, 8vw, 88px);
  overflow: hidden;
}

.hero .eyebrow {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
  position: relative;
  z-index: 1;
}

.hero h1 {
  position: relative;
  z-index: 1;
  font-size: clamp(48px, 9vw, 108px);
  line-height: 0.92;
  margin-top: 18px;
  max-width: 16ch;
}

.hero .lede {
  position: relative;
  z-index: 1;
  font-family: var(--font-body);
  text-transform: none;
  font-size: clamp(17px, 2vw, 21px);
  color: var(--ink-dim);
  max-width: 46ch;
  margin-top: 22px;
  line-height: 1.55;
}

.hero .actions {
  position: relative;
  z-index: 1;
  display: flex;
  gap: 14px;
  margin-top: 34px;
  flex-wrap: wrap;
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 13px 22px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  transition: transform 160ms var(--ease-out), background 160ms ease, border-color 160ms ease;
  cursor: pointer;
}
.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--ink);
  color: var(--paper);
}
:root[data-theme="dark"] .btn-primary,
@media (prefers-color-scheme: dark) {
  .btn-primary { background: var(--ink); color: var(--paper); }
}
.btn-primary:hover { background: var(--accent); color: var(--accent-ink); }

.btn-ghost {
  border-color: var(--line-strong);
  color: var(--ink);
  background: transparent;
}
.btn-ghost:hover { border-color: var(--ink); }

/* ==========================================================================
   Sections
   ========================================================================== */

section.block {
  padding: clamp(56px, 9vw, 100px) 0;
  border-bottom: 1px solid var(--line);
}
section.block:last-of-type { border-bottom: none; }

.block-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 24px;
  margin-bottom: 44px;
  flex-wrap: wrap;
}

.block-head .index {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink-dim);
}

.block-head h2 {
  font-size: clamp(30px, 4vw, 44px);
  margin-top: 8px;
}

.block-head .intro {
  max-width: 40ch;
  font-family: var(--font-body);
  text-transform: none;
  color: var(--ink-dim);
  font-size: 16px;
  line-height: 1.6;
}

/* -- pillars / feature grid -- */
.pillars {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.pillar {
  background: var(--paper-raised);
  padding: 30px 26px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.pillar .num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
}
.pillar h3 {
  font-size: 20px;
  text-transform: none;
  letter-spacing: 0;
}
.pillar p {
  font-family: var(--font-body);
  font-size: 14.5px;
  color: var(--ink-dim);
  line-height: 1.6;
}

@media (max-width: 900px) {
  .pillars { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .pillars { grid-template-columns: 1fr; }
}

/* -- work / portfolio grid --
   Deliberately not three equal columns: one project is featured wider,
   the other two stack beside it. Three identical cards in a row is the
   layout every template defaults to; a real edit picks one to lead. */
.work-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  grid-template-rows: repeat(2, 1fr);
  gap: 28px;
}
.work-card--featured {
  grid-row: 1 / 3;
}
.work-card--featured .frame { aspect-ratio: 4 / 5; }
@media (max-width: 900px) {
  .work-grid { grid-template-columns: 1fr; grid-template-rows: none; }
  .work-card--featured { grid-row: auto; }
  .work-card--featured .frame { aspect-ratio: 4 / 3; }
}

.work-card {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
}
.work-card .frame {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background: var(--paper-raised);
}
.work-card .frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 400ms var(--ease-out);
}
@media (hover: hover) and (pointer: fine) {
  .work-card:hover .frame img { transform: scale(1.04); }
}
.work-card .tag {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent);
  margin-top: 16px;
}
.work-card h3 {
  font-size: 19px;
  text-transform: none;
  letter-spacing: 0;
  margin-top: 6px;
}
.work-card p {
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--ink-dim);
  margin-top: 8px;
  line-height: 1.55;
}

/* -- stat row -- */
.stat-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border: 1px solid var(--line);
  background: var(--line);
  gap: 1px;
}
.stat {
  background: var(--paper-raised);
  padding: 26px 24px;
}
.stat .value {
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 600;
  color: var(--ink);
}
.stat .label {
  font-family: var(--font-body);
  font-size: 13.5px;
  color: var(--ink-dim);
  margin-top: 6px;
}
@media (max-width: 700px) {
  .stat-row { grid-template-columns: 1fr; }
}

/* -- CTA banner -- */
.cta-banner {
  background: var(--ink);
  color: var(--paper);
  padding: clamp(48px, 8vw, 80px) 0;
}
.cta-banner .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}
.cta-banner h2 {
  font-size: clamp(28px, 4vw, 42px);
  max-width: 14ch;
}
.cta-banner .btn-primary {
  background: var(--accent);
  color: var(--accent-ink);
}
.cta-banner .btn-primary:hover { background: var(--paper); color: var(--ink); }

/* ==========================================================================
   Contact form
   ========================================================================== */

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 56px;
}
@media (max-width: 860px) {
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
}

.contact-info dl {
  margin: 28px 0 0;
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.contact-info dt {
  font-family: var(--font-mono);
  font-size: 11.5px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ink-dim);
}
.contact-info dd {
  margin: 4px 0 0;
  font-size: 17px;
}
.contact-info dd a { text-decoration: none; border-bottom: 1px solid var(--line-strong); }
.contact-info dd a:hover { border-color: var(--accent); color: var(--accent); }

form.contact-form {
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.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(--ink-dim);
}
.field input,
.field textarea {
  font-family: var(--font-body);
  font-size: 15.5px;
  color: var(--ink);
  background: var(--paper-raised);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: 13px 14px;
  transition: border-color 160ms ease;
}
.field input:focus,
.field textarea:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  border-color: var(--accent);
}
.field textarea { resize: vertical; min-height: 140px; }

.form-note {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--ink-dim);
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  border-top: 1px solid var(--line);
  padding: 40px 0;
}
.site-footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--ink-dim);
}
.site-footer a { text-decoration: none; color: var(--ink-dim); }
.site-footer a:hover { color: var(--accent); }
.site-footer .foot-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  list-style: none;
  margin: 0;
  padding: 0;
}

@media (max-width: 560px) {
  .site-footer .container { justify-content: flex-start; }
  .site-footer .foot-links { gap: 8px 16px; }
}

@media (prefers-reduced-motion: reduce) {
  .work-card .frame img { transition: none; }
}