/* DRIFT Partners — editorial site styles */

:root {
  --paper: #f4f1ea;
  --paper-deep: #ece8df;
  --paper-edge: #e0dbd0;
  --ink: #14110d;
  --ink-soft: #2a2520;
  --ink-mute: #6b6358;
  --ink-quiet: #948b7e;
  --rule: #c9c2b3;
  --rule-soft: #ddd6c8;
  --accent: #7a2e1f;        /* oxblood */
  --accent-soft: #9c4a3a;
  --highlight: #e8e2d2;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  background: var(--paper);
  color: var(--ink);
  font-family: 'Source Serif 4', 'Source Serif Pro', Georgia, serif;
  font-size: 18px;
  line-height: 1.55;
  font-feature-settings: "kern" 1, "liga" 1, "onum" 1;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body {
  overflow-x: hidden;
}

.mono {
  font-family: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, monospace;
  font-size: 0.78em;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.serif-display {
  font-family: 'Source Serif 4', 'Source Serif Pro', Georgia, serif;
  font-weight: 300;
  letter-spacing: -0.018em;
  line-height: 1.05;
}

a { color: inherit; text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { color: var(--accent); }

button { font: inherit; background: none; border: 0; color: inherit; cursor: pointer; }

/* ---------- Page shell ---------- */

.shell {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 56px;
}

@media (max-width: 720px) {
  .shell { padding: 0 24px; }
  html, body { font-size: 16px; }
}

/* ---------- Nav ---------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in oklab, var(--paper) 92%, transparent);
  backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--rule-soft);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0 12px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav-brand {
  display: flex;
  align-items: center;
  color: var(--ink);
}
.nav-brand svg { transition: opacity 200ms ease; }
.nav-brand:hover svg { opacity: 0.75; }

.nav-links {
  display: flex;
  gap: 36px;
  align-items: baseline;
}
.nav-links a {
  text-decoration: none;
  color: var(--ink-soft);
  transition: color 120ms ease;
}
.nav-links a:hover { color: var(--accent); }
.nav-cta {
  color: var(--ink) !important;
  border-bottom: 1px solid var(--ink);
  padding-bottom: 2px;
}

@media (max-width: 720px) {
  .nav-links { gap: 18px; font-size: 11px; }
  .nav-links a:not(.nav-cta):not(.always-show) { display: none; }
}

/* ---------- Hero ---------- */

.hero {
  padding: 120px 0 100px;
  border-bottom: 1px solid var(--rule);
  position: relative;
}

.hero-meta {
  display: flex;
  justify-content: space-between;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-bottom: 64px;
}
.hero-meta .dot {
  display: inline-block;
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent);
  margin-right: 8px;
  vertical-align: middle;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 88px;
  align-items: start;
}

.hero-headline {
  font-size: clamp(46px, 6.4vw, 96px);
  line-height: 0.98;
  letter-spacing: -0.025em;
  font-weight: 300;
}
.hero-headline em {
  font-style: italic;
  color: var(--accent);
  font-weight: 300;
}
.hero-headline .strike {
  position: relative;
  display: inline-block;
  color: var(--ink-mute);
}
.hero-headline .strike::after {
  content: "";
  position: absolute;
  left: 0; right: 0;
  top: 56%;
  height: 1px;
  background: var(--ink-mute);
}

.hero-side {
  display: flex;
  flex-direction: column;
  gap: 28px;
  padding-top: 18px;
}
.hero-side .label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-mute);
}
.hero-side p {
  font-size: 18px;
  line-height: 1.6;
  color: var(--ink-soft);
}
.hero-side p .lede {
  font-style: italic;
  color: var(--ink);
}

@media (max-width: 920px) {
  .hero { padding: 80px 0 60px; }
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
}

/* Drift glyph in hero */
.drift-glyph {
  position: absolute;
  right: 56px;
  top: 80px;
  width: 140px;
  height: 140px;
  opacity: 0.7;
  pointer-events: none;
}
@media (max-width: 920px) {
  .drift-glyph { display: none; }
}

/* ---------- Section primitives ---------- */

section.band {
  padding: 110px 0;
  border-bottom: 1px solid var(--rule);
}
section.band.tight { padding: 70px 0; }
section.band.dark {
  background: var(--ink);
  color: var(--paper);
  border-bottom-color: #2a2520;
}
section.band.deep {
  background: var(--paper-deep);
}

@media (max-width: 720px) {
  section.band { padding: 70px 0; }
}

.section-head {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 56px;
  align-items: baseline;
  margin-bottom: 56px;
}
.section-head .ord {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-mute);
  padding-top: 10px;
  border-top: 1px solid var(--rule);
}
section.band.dark .section-head .ord { color: #888076; border-top-color: #2a2520; }

.section-head h2 {
  font-family: 'Source Serif 4', serif;
  font-size: clamp(34px, 4.2vw, 56px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  font-weight: 300;
  text-wrap: balance;
}
.section-head h2 em { font-style: italic; color: var(--accent); }
section.band.dark .section-head h2 em { color: #d99a85; }

@media (max-width: 720px) {
  .section-head { grid-template-columns: 1fr; gap: 14px; }
  .section-head .ord { padding-top: 8px; }
}

.prose {
  max-width: 64ch;
  font-size: 19px;
  line-height: 1.62;
  color: var(--ink-soft);
}
section.band.dark .prose { color: #d8d2c4; }
.prose p + p { margin-top: 1.1em; }
.prose .pull {
  font-family: 'Source Serif 4', serif;
  font-style: italic;
  color: var(--ink);
}
section.band.dark .prose .pull { color: var(--paper); }

/* ---------- Drift definition card ---------- */

.def-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}
@media (max-width: 920px) {
  .def-row { grid-template-columns: 1fr; gap: 40px; }
}

.def-card {
  border: 1px solid var(--rule);
  background: var(--paper);
  padding: 36px 36px 32px;
  position: relative;
}
.def-card .term {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-bottom: 20px;
}
.def-card .term::before {
  content: "n.";
  font-style: italic;
  text-transform: none;
  color: var(--accent);
  margin-right: 8px;
}
.def-card .definition {
  font-size: 22px;
  line-height: 1.4;
  font-weight: 300;
  color: var(--ink);
}
.def-card .definition em { font-style: italic; }
.def-card .footnote {
  margin-top: 24px;
  padding-top: 18px;
  border-top: 1px dashed var(--rule);
  font-size: 14px;
  color: var(--ink-mute);
}

/* ---------- Mechanisms ---------- */

.mechanism-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}
@media (max-width: 1100px) {
  .mechanism-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .mechanism-grid { grid-template-columns: 1fr; }
}

.mech {
  background: var(--paper);
  padding: 32px 24px 28px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-height: 240px;
  transition: background 200ms ease;
  cursor: default;
}
.mech:hover { background: var(--paper-deep); }
.mech .num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--ink-mute);
}
.mech h4 {
  font-family: 'Source Serif 4', serif;
  font-size: 20px;
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: -0.01em;
}
.mech p {
  font-size: 14px;
  line-height: 1.5;
  color: var(--ink-mute);
}
.mech .icon {
  width: 56px;
  height: 56px;
  margin-bottom: 6px;
}

/* ---------- Method (4 steps) ---------- */

.method {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border-top: 1px solid var(--rule);
}
@media (max-width: 980px) {
  .method { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 580px) {
  .method { grid-template-columns: 1fr; }
}
.step {
  padding: 36px 28px 40px;
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  position: relative;
  background: var(--paper);
}
.method > .step:last-child { border-right: 0; }
@media (max-width: 980px) {
  .method > .step:nth-child(2) { border-right: 0; }
}
.step .ord-large {
  font-family: 'Source Serif 4', serif;
  font-size: 56px;
  font-weight: 300;
  font-style: italic;
  color: var(--accent);
  line-height: 1;
  letter-spacing: -0.02em;
  margin-bottom: 28px;
}
.step h3 {
  font-family: 'Source Serif 4', serif;
  font-size: 24px;
  font-weight: 400;
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin-bottom: 14px;
}
.step p {
  font-size: 15px;
  line-height: 1.6;
  color: var(--ink-mute);
}
.step .step-diagram {
  margin-top: 24px;
  height: 80px;
}

/* ---------- Vignettes (case studies) ---------- */

.vignette {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 56px;
  padding: 48px 0;
  border-bottom: 1px solid var(--rule-soft);
}
.vignette:last-child { border-bottom: 0; }

@media (max-width: 820px) {
  .vignette { grid-template-columns: 1fr; gap: 18px; }
}

.vignette .vmeta {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-mute);
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.vignette .vmeta .industry { color: var(--ink); }
.vignette h3 {
  font-family: 'Source Serif 4', serif;
  font-size: 28px;
  font-weight: 400;
  letter-spacing: -0.015em;
  line-height: 1.15;
  margin-bottom: 16px;
}
.vignette .v-body p {
  font-size: 17px;
  line-height: 1.6;
  color: var(--ink-soft);
}
.vignette .v-body p + p { margin-top: 0.9em; }
.vignette .outcome {
  margin-top: 24px;
  padding-top: 18px;
  border-top: 1px dashed var(--rule);
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 18px;
  align-items: baseline;
}
.vignette .outcome .label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}
.vignette .outcome p {
  font-style: italic;
  color: var(--ink);
  font-size: 17px;
  line-height: 1.5;
}

/* ---------- Engagement bands ---------- */

.engagements {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
@media (max-width: 920px) { .engagements { grid-template-columns: 1fr; } }

.eng {
  border: 1px solid var(--rule);
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  background: var(--paper);
}
.eng .ekind {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-mute);
}
.eng h4 {
  font-family: 'Source Serif 4', serif;
  font-size: 28px;
  font-weight: 300;
  letter-spacing: -0.015em;
  line-height: 1.1;
}
.eng .duration {
  font-style: italic;
  color: var(--accent);
  font-size: 15px;
}
.eng p {
  font-size: 15px;
  line-height: 1.55;
  color: var(--ink-mute);
}
.eng ul {
  list-style: none;
  border-top: 1px dashed var(--rule);
  padding-top: 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.eng li {
  font-size: 14px;
  color: var(--ink-soft);
  padding-left: 18px;
  position: relative;
}
.eng li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--ink-quiet);
}

/* ---------- Self-qualifier ---------- */

.qualifier {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  border: 1px solid var(--rule);
  padding: 48px;
  background: var(--paper);
}
@media (max-width: 820px) {
  .qualifier { grid-template-columns: 1fr; gap: 24px; padding: 32px; }
}
.qualifier h3 {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-bottom: 22px;
}
.qualifier ul { list-style: none; display: flex; flex-direction: column; gap: 14px; }
.qualifier li {
  font-size: 16px;
  line-height: 1.45;
  padding-left: 28px;
  position: relative;
}
.qualifier .for li::before {
  content: "→";
  position: absolute; left: 0;
  color: var(--accent);
  font-family: 'Source Serif 4', serif;
}
.qualifier .notfor {
  border-left: 1px solid var(--rule);
  padding-left: 64px;
}
.qualifier .notfor li::before {
  content: "×";
  position: absolute; left: 0;
  color: var(--ink-quiet);
}
.qualifier .notfor li {
  color: var(--ink-mute);
}
@media (max-width: 820px) {
  .qualifier .notfor { border-left: 0; padding-left: 0; border-top: 1px solid var(--rule); padding-top: 24px; }
}

/* ---------- Partners (about) ---------- */

.partners-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
}
@media (max-width: 820px) { .partners-row { grid-template-columns: 1fr; gap: 40px; } }

.partner h3 {
  font-family: 'Source Serif 4', serif;
  font-size: 32px;
  font-weight: 400;
  letter-spacing: -0.015em;
  margin-bottom: 6px;
}
.partner .role {
  font-style: italic;
  color: var(--accent);
  margin-bottom: 24px;
  font-size: 16px;
}
.partner p {
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink-soft);
}
.partner p + p { margin-top: 0.9em; }

/* ---------- Clients ---------- */

.clients {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 4px 56px;
  font-family: 'Source Serif 4', serif;
  font-size: 18px;
}
.clients div {
  padding: 14px 0;
  border-top: 1px solid var(--rule-soft);
  color: var(--ink-soft);
  letter-spacing: 0.005em;
}
@media (max-width: 720px) {
  .clients { grid-template-columns: 1fr 1fr; gap: 0 32px; }
}

/* ---------- Contact / sign-off ---------- */

.signoff {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}
@media (max-width: 920px) { .signoff { grid-template-columns: 1fr; gap: 48px; } }

.signoff .letter {
  font-family: 'Source Serif 4', serif;
  font-size: 22px;
  line-height: 1.5;
  font-weight: 300;
  color: var(--paper);
  letter-spacing: -0.01em;
}
.signoff .letter p + p { margin-top: 1em; }
.signoff .letter em { font-style: italic; color: #d99a85; }

.signoff .contact-card {
  background: rgba(255,255,255,0.03);
  border: 1px solid #2a2520;
  padding: 36px;
}
.signoff .contact-card .label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #888076;
  margin-bottom: 20px;
}
.signoff .contact-card .email {
  font-family: 'Source Serif 4', serif;
  font-size: 32px;
  font-weight: 300;
  color: var(--paper);
  text-decoration: none;
  display: inline-block;
  border-bottom: 1px solid #4a4239;
  padding-bottom: 4px;
  letter-spacing: -0.01em;
}
.signoff .contact-card .email:hover { color: #d99a85; border-bottom-color: #d99a85; }
.signoff .contact-card .meta {
  margin-top: 28px;
  display: grid;
  gap: 14px;
  font-size: 14px;
  color: #b8b1a4;
}
.signoff .contact-card .meta .row {
  display: flex; justify-content: space-between; gap: 16px;
  border-top: 1px dashed #2a2520;
  padding-top: 12px;
}
.signoff .contact-card .meta .k { color: #888076; }

/* Form */
.note-form {
  margin-top: 36px;
  border-top: 1px solid #2a2520;
  padding-top: 32px;
}
.note-form .label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #888076;
  margin-bottom: 16px;
}
.note-form .field {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 16px;
  border-bottom: 1px solid #2a2520;
  padding: 12px 0;
  align-items: baseline;
}
.note-form .field span {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: #888076;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.note-form input,
.note-form textarea {
  background: transparent;
  border: 0;
  color: var(--paper);
  font: inherit;
  font-family: 'Source Serif 4', serif;
  font-size: 16px;
  width: 100%;
  outline: none;
  resize: none;
}
.note-form input::placeholder,
.note-form textarea::placeholder { color: #5a5249; font-style: italic; }
.note-form .submit {
  margin-top: 24px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--paper);
  border-bottom: 1px solid var(--paper);
  padding-bottom: 4px;
  cursor: pointer;
  transition: color 120ms ease, border-color 120ms ease;
}
.note-form .submit:hover { color: #d99a85; border-bottom-color: #d99a85; }
.note-form .sent {
  margin-top: 24px;
  color: #d99a85;
  font-style: italic;
}

/* ---------- Footer ---------- */

footer.foot {
  padding: 40px 0;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-mute);
  display: flex;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

/* ---------- Marginalia / annotations ---------- */

.marg {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-mute);
}

/* ---------- Utility ---------- */

.rule {
  height: 1px;
  background: var(--rule);
  margin: 48px 0;
}
.rule.thin { background: var(--rule-soft); }

.eyebrow {
  display: inline-block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 18px;
}

/* ---------- Drift indicator (decorative) ---------- */

.field-anim {
  display: block;
  width: 100%;
  height: auto;
}

/* Vignette quote pull */
.bigpull {
  font-family: 'Source Serif 4', serif;
  font-style: italic;
  font-weight: 300;
  font-size: clamp(28px, 3.4vw, 48px);
  line-height: 1.18;
  letter-spacing: -0.018em;
  max-width: 24ch;
  color: var(--ink);
  text-wrap: balance;
}
.bigpull .quietmark { color: var(--accent); font-style: normal; }

/* dark variant */
section.band.dark .bigpull { color: var(--paper); }

/* selection */
::selection {
  background: var(--accent);
  color: var(--paper);
}