:root {
  --ink: #1c231d;
  --ink-soft: #4a5548;
  --paper: #f7f5ee;
  --paper-raised: #ffffff;
  --wire: #8a9186;
  --wire-faint: #dcd8c9;
  --accent: #7a6a3f;
  --accent-soft: #ece4cd;
  --olive: #4f6b4a;
  --olive-soft: #dfe8dc;
  --card-border: #e6e1d1;
  --shadow: 0 1px 2px rgba(28, 35, 29, 0.05), 0 10px 28px -14px rgba(28, 35, 29, 0.16);
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --serif: "Fraunces", Georgia, "Times New Roman", serif;
  color-scheme: light;
}

:root[data-theme="dark"] {
  --ink: #eef0e9;
  --ink-soft: #b7bfb1;
  --paper: #14170f;
  --paper-raised: #1b1f17;
  --wire: #616a5c;
  --wire-faint: #2a2e24;
  --accent: #d3b876;
  --accent-soft: #33291a;
  --olive: #9bc198;
  --olive-soft: #23301f;
  --card-border: #2b2f24;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.35), 0 14px 34px -14px rgba(0, 0, 0, 0.55);
  color-scheme: dark;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ink: #eef0e9;
    --ink-soft: #b7bfb1;
    --paper: #14170f;
    --paper-raised: #1b1f17;
    --wire: #616a5c;
    --wire-faint: #2a2e24;
    --accent: #d3b876;
    --accent-soft: #33291a;
    --olive: #9bc198;
    --olive-soft: #23301f;
    --card-border: #2b2f24;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.35), 0 14px 34px -14px rgba(0, 0, 0, 0.55);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--accent-soft); color: var(--ink); }

a { color: inherit; }

.wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 28px;
}

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

.site-nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--wire-faint);
}

.site-nav .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 18px;
  padding-bottom: 18px;
}

.wordmark {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 18px;
  letter-spacing: -0.01em;
  text-decoration: none;
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.wordmark .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  display: inline-block;
  margin-right: 2px;
}

.wordmark .tail {
  font-family: var(--mono);
  font-weight: 400;
  font-size: 12px;
  color: var(--wire);
  letter-spacing: 0.02em;
}

.nav-links {
  display: flex;
  gap: 28px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 13.5px;
}

.nav-links a {
  text-decoration: none;
  color: var(--ink-soft);
  transition: color 0.15s ease;
}

.nav-links a:hover { color: var(--ink); }

.nav-cta {
  font-family: var(--mono);
  font-size: 12.5px;
  padding: 7px 14px;
  border-radius: 8px;
  background: var(--ink);
  color: var(--paper);
  text-decoration: none;
  white-space: nowrap;
}

:root[data-theme="dark"] .nav-cta { background: var(--accent); color: #14170f; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .nav-cta { background: var(--accent); color: #14170f; }
}

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

.hero {
  padding: 84px 0 64px;
  border-bottom: 1px solid var(--wire-faint);
}

.eyebrow {
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
}

.eyebrow::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

h1 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(34px, 4.6vw, 54px);
  line-height: 1.08;
  margin: 0 0 22px;
  letter-spacing: -0.01em;
  max-width: 18ch;
}

h1 em {
  font-style: italic;
  color: var(--accent);
}

.hero .lede {
  font-size: 17.5px;
  color: var(--ink-soft);
  max-width: 62ch;
  margin: 0 0 36px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 10px;
  font-size: 14.5px;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.12s ease, filter 0.12s ease;
}

.btn:hover { filter: brightness(0.96); }
.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--ink);
  color: var(--paper);
}
:root[data-theme="dark"] .btn-primary { background: var(--accent); color: #14170f; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .btn-primary { background: var(--accent); color: #14170f; }
}

.btn-ghost {
  border: 1px solid var(--wire-faint);
  color: var(--ink);
  background: var(--paper-raised);
}

.stat-row {
  display: flex;
  gap: 0;
  flex-wrap: wrap;
  border-top: 1px solid var(--wire-faint);
  padding-top: 22px;
}

.stat {
  padding: 0 30px 0 0;
  margin-right: 30px;
  border-right: 1px solid var(--wire-faint);
}
.stat:last-child { border-right: none; margin-right: 0; }

.stat .n {
  font-family: var(--mono);
  font-size: 27px;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  display: block;
  letter-spacing: -0.01em;
}

.stat .l {
  font-size: 11.5px;
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ---------- Generic section ---------- */

section { padding: 76px 0; border-bottom: 1px solid var(--wire-faint); }
section:last-of-type { border-bottom: none; }

.section-head { margin-bottom: 40px; }

.section-label {
  font-family: var(--mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--wire);
  margin-bottom: 10px;
}

.section-head h2 {
  font-family: var(--serif);
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 600;
  margin: 0 0 10px;
}

.section-head p {
  font-size: 15px;
  color: var(--ink-soft);
  max-width: 68ch;
  margin: 0;
}

/* ---------- Case study: river chart ---------- */

.river-scroll { overflow-x: auto; padding-bottom: 4px; }

.river {
  min-width: 760px;
  display: flex;
  align-items: flex-end;
  gap: 3px;
  height: 130px;
  padding: 0 2px;
}

.river-bar {
  flex: 1;
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  height: 100%;
}

.river-bar .bar {
  width: 100%;
  border-radius: 2px 2px 0 0;
  background: var(--wire-faint);
  position: relative;
  transition: filter 0.15s ease;
}

.river-bar.phase-1 .bar { background: var(--accent-soft); border-top: 2px solid var(--accent); }
.river-bar.phase-2 .bar { background: var(--wire-faint); border-top: 2px solid var(--wire); }
.river-bar.phase-3 .bar,
.river-bar.phase-4 .bar { background: var(--olive-soft); border-top: 2px solid var(--olive); }
.river-bar.phase-5 .bar,
.river-bar.phase-6 .bar { background: var(--accent-soft); border-top: 2px solid var(--accent); }

.river-bar:hover .bar { filter: brightness(0.94); }
:root[data-theme="dark"] .river-bar:hover .bar { filter: brightness(1.25); }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .river-bar:hover .bar { filter: brightness(1.25); }
}

.river-bar .count {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--ink-soft);
  margin-bottom: 4px;
  font-variant-numeric: tabular-nums;
  opacity: 0;
  transition: opacity 0.15s ease;
}
.river-bar:hover .count { opacity: 1; }

.river-labels {
  min-width: 760px;
  display: flex;
  gap: 3px;
  padding: 0 2px;
  margin-top: 6px;
}
.river-labels span {
  flex: 1;
  font-family: var(--mono);
  font-size: 9.5px;
  color: var(--wire);
  text-align: center;
  white-space: nowrap;
}

.river-legend {
  display: flex;
  gap: 20px;
  margin-top: 18px;
  flex-wrap: wrap;
}
.river-legend .item {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 12.5px;
  color: var(--ink-soft);
}
.river-legend .swatch { width: 11px; height: 11px; border-radius: 2px; }

/* ---------- Phase cards ---------- */

.phases {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 1px;
  background: var(--wire-faint);
  border: 1px solid var(--wire-faint);
  border-radius: 10px;
  overflow: hidden;
  margin-top: 32px;
}

.phase-card {
  background: var(--paper-raised);
  padding: 18px 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.phase-card .pnum { font-family: var(--mono); font-size: 10.5px; color: var(--wire); }
.phase-card .prange { font-family: var(--mono); font-size: 10.5px; color: var(--ink-soft); }
.phase-card h3 { font-family: var(--serif); font-size: 15.5px; font-weight: 600; margin: 2px 0 0; line-height: 1.2; }
.phase-card p { font-size: 12px; color: var(--ink-soft); margin: 0; line-height: 1.45; }

/* ---------- War stories ---------- */

.war-stories {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
  margin-top: 32px;
}

.war-story {
  background: var(--paper-raised);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 22px;
  box-shadow: var(--shadow);
}

.war-story .tag {
  font-family: var(--mono);
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
  margin-bottom: 10px;
  display: block;
}

.war-story h3 {
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 600;
  margin: 0 0 10px;
  line-height: 1.3;
}

.war-story p {
  font-size: 13.5px;
  color: var(--ink-soft);
  margin: 0;
}

/* ---------- Timeline (feature areas) ---------- */

.trunk { position: relative; padding-left: 26px; margin-top: 40px; }

.trunk::before {
  content: "";
  position: absolute;
  left: 26px;
  top: 4px;
  bottom: 4px;
  width: 2px;
  background: linear-gradient(180deg, var(--accent) 0%, var(--wire) 30%, var(--olive) 65%, var(--accent) 100%);
}

.area {
  position: relative;
  margin-left: 20px;
  padding: 0 0 44px 40px;
  border-left: 1px solid var(--wire-faint);
}
.area:last-child { border-left: 1px solid transparent; padding-bottom: 0; }

.area::before {
  content: "";
  position: absolute;
  left: -21px;
  top: 20px;
  width: 40px;
  height: 40px;
  border-left: 2px solid var(--branch-color, var(--wire));
  border-bottom: 2px solid var(--branch-color, var(--wire));
  border-radius: 0 0 0 16px;
  opacity: 0.5;
}

.area::after {
  content: "";
  position: absolute;
  left: -25px;
  top: 16px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--branch-color, var(--wire));
  box-shadow: 0 0 0 4px var(--paper);
}

.area-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 4px;
  flex-wrap: wrap;
}

.area-title-group { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; }

.area h3 { font-family: var(--serif); font-size: 18px; font-weight: 600; margin: 0; }
.area .since { font-family: var(--mono); font-size: 11px; color: var(--wire); }

.status-pill {
  font-family: var(--mono);
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 3px 9px;
  border-radius: 100px;
  white-space: nowrap;
  border: 1px solid transparent;
  flex-shrink: 0;
}
.status-pill.active { background: var(--accent-soft); color: var(--accent); border-color: color-mix(in srgb, var(--accent) 35%, transparent); }
.status-pill.mature { background: var(--olive-soft); color: var(--olive); border-color: color-mix(in srgb, var(--olive) 35%, transparent); }

.milestones {
  display: flex;
  flex-direction: column;
  background: var(--paper-raised);
  border: 1px solid var(--card-border);
  border-radius: 10px;
  box-shadow: var(--shadow);
  overflow: hidden;
  margin-top: 14px;
}

.ms {
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: 16px;
  padding: 11px 15px;
  border-bottom: 1px solid var(--card-border);
  align-items: baseline;
}
.ms:last-child { border-bottom: none; }

.ms .date {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--wire);
  font-variant-numeric: tabular-nums;
}
.ms .msg { font-size: 13px; color: var(--ink); line-height: 1.4; }

/* ---------- Approach steps ---------- */

.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
  margin-top: 32px;
}

.step {
  position: relative;
  padding-top: 8px;
}

.step .snum {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--accent);
  margin-bottom: 10px;
  display: block;
}

.step h3 {
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 600;
  margin: 0 0 8px;
}

.step p { font-size: 13.5px; color: var(--ink-soft); margin: 0; }

/* ---------- Services ---------- */

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 20px;
  margin-top: 32px;
}

.service-card {
  background: var(--paper-raised);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 24px;
}

.service-card h3 {
  font-family: var(--serif);
  font-size: 17.5px;
  font-weight: 600;
  margin: 0 0 10px;
}

.service-card p { font-size: 13.5px; color: var(--ink-soft); margin: 0; }

/* ---------- Platforms strip ---------- */

.platform-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.platform-chip {
  font-family: var(--mono);
  font-size: 13px;
  padding: 9px 16px;
  border-radius: 100px;
  border: 1px solid var(--card-border);
  background: var(--paper-raised);
  color: var(--ink);
}

.platform-chip.highlight {
  border-color: color-mix(in srgb, var(--accent) 45%, transparent);
  color: var(--accent);
  background: var(--accent-soft);
}

/* ---------- Contact ---------- */

.contact-box {
  background: var(--ink);
  color: var(--paper);
  border-radius: 16px;
  padding: 48px 40px;
  text-align: center;
}

:root[data-theme="dark"] .contact-box { background: var(--paper-raised); border: 1px solid var(--card-border); }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .contact-box { background: var(--paper-raised); border: 1px solid var(--card-border); }
}

.contact-box h2 {
  font-family: var(--serif);
  font-size: clamp(24px, 3vw, 30px);
  font-weight: 600;
  margin: 0 0 12px;
}

.contact-box p {
  font-size: 15px;
  opacity: 0.82;
  max-width: 50ch;
  margin: 0 auto 26px;
}

.contact-box .btn-primary {
  background: var(--paper);
  color: var(--ink);
}
:root[data-theme="dark"] .contact-box .btn-primary { background: var(--accent); color: #14170f; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .contact-box .btn-primary { background: var(--accent); color: #14170f; }
}

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

footer {
  padding: 32px 0 48px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--wire);
}

/* ---------- Responsive ---------- */

@media (max-width: 860px) {
  .phases { grid-template-columns: repeat(2, 1fr); }
  .ms { grid-template-columns: 1fr; gap: 3px; }
  .nav-links { display: none; }
}

@media (max-width: 520px) {
  .phases { grid-template-columns: 1fr; }
  .wrap { padding: 0 18px; }
  .contact-box { padding: 36px 22px; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
  html { scroll-behavior: auto; }
}