/* =======================================================
   Hellespont v1 — minimal, calm, systems-oriented
   ======================================================= */

:root {
  --bg: #f7f5f0;           /* warm paper */
  --bg-elev: #fbfaf6;
  --ink: #1a1a1a;
  --ink-2: #3a3a3a;
  --muted: #6a6860;
  --line: #d9d5ca;
  --line-2: #eae5d8;
  --accent: #2b3a55;       /* deep navy */
  --accent-soft: #e9ecf3;
  --mark: #c7b27a;         /* subtle gold */
  --max: 1180px;
  --gutter: 28px;
  --radius: 4px;

  --serif: "IBM Plex Serif", Georgia, serif;
  --sans: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; text-decoration: none; }
a:hover { color: var(--accent); }

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

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

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(247, 245, 240, 0.88);
  backdrop-filter: saturate(160%) blur(8px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  height: 64px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  letter-spacing: 0.01em;
}
.brand-mark {
  width: 14px;
  height: 14px;
  background: var(--ink);
  display: inline-block;
  position: relative;
}
.brand-mark::after {
  content: "";
  position: absolute;
  inset: 3px;
  background: var(--mark);
}
.brand-mark.small { width: 10px; height: 10px; }
.brand-mark.small::after { inset: 2px; }
.brand-name { font-family: var(--serif); font-size: 18px; }

.nav {
  display: flex;
  gap: 22px;
  margin-left: auto;
  font-size: 14px;
  color: var(--ink-2);
}
.nav a {
  padding: 6px 2px;
  border-bottom: 1px solid transparent;
  transition: color .15s ease, border-color .15s ease;
}
.nav a:hover { border-bottom-color: var(--ink); }

.meta { margin-left: 12px; }
.tag {
  font-family: var(--mono);
  font-size: 11px;
  padding: 3px 7px;
  border: 1px solid var(--line);
  border-radius: 2px;
  color: var(--muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

@media (max-width: 760px) {
  .nav { display: none; }
}

/* ---------- Sections ---------- */
.section {
  padding: 88px 0;
}
.rule {
  height: 1px;
  background: var(--line);
}
.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 32px;
}
.col-span-4 { grid-column: span 4; }
.col-span-6 { grid-column: span 6; }
.col-span-8 { grid-column: span 8; }
@media (max-width: 880px) {
  .col-span-4, .col-span-6, .col-span-8 { grid-column: span 12; }
  .section { padding: 64px 0; }
}

.section-head {
  margin-bottom: 40px;
}
.section-head.sticky {
  position: sticky;
  top: 88px;
  align-self: start;
}
.section-num {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  display: inline-block;
  margin-bottom: 12px;
}
.section-head h2 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 34px;
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin: 0 0 10px 0;
}
.section-sub {
  color: var(--muted);
  max-width: 40ch;
  margin: 0;
}

/* ---------- Hero ---------- */
.hero {
  padding-top: 96px;
  padding-bottom: 64px;
}
.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 20px 0;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--mark);
  display: inline-block;
}
h1 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(34px, 5.2vw, 60px);
  line-height: 1.08;
  letter-spacing: -0.015em;
  margin: 0 0 20px 0;
  max-width: 18ch;
}
.lede {
  font-size: 19px;
  color: var(--ink-2);
  max-width: 62ch;
  margin: 0 0 22px 0;
}
.body {
  color: var(--ink-2);
  max-width: 65ch;
  margin: 0 0 24px 0;
}

.cta-row {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 8px;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 44px;
  padding: 0 18px;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 500;
  border: 1px solid transparent;
  transition: background .15s ease, color .15s ease, border-color .15s ease;
}
.btn.primary {
  background: var(--ink);
  color: var(--bg);
}
.btn.primary:hover { background: var(--accent); color: #fff; }
.btn.ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}
.btn.ghost:hover { border-color: var(--ink); }

/* ---------- Hero side card ---------- */
.sidecard { display: flex; align-items: flex-start; }
.card {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 18px 14px;
  width: 100%;
  font-family: var(--mono);
  font-size: 13px;
}
.card-head, .card-foot {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--line);
  color: var(--muted);
}
.card-foot {
  border-bottom: none;
  border-top: 1px dashed var(--line);
  padding-top: 10px;
  padding-bottom: 0;
  margin-top: 8px;
}
.card-head .v, .card-foot .v { color: var(--ink); }
.card-head .k, .card-foot .k {
  font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase;
}
.tabs-list {
  list-style: none;
  padding: 14px 0 6px;
  margin: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
}
.tabs-list li {
  display: flex;
  align-items: center;
  color: var(--ink-2);
}
.tabs-list li::before {
  content: "›";
  margin-right: 10px;
  color: var(--mark);
}

/* ---------- Principles ---------- */
.principles {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.principles li {
  padding: 26px 24px 26px 0;
  border-right: 1px solid var(--line-2);
}
.principles li:last-child { border-right: none; padding-right: 0; }
.principles .n {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.12em;
}
.principles h3 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 19px;
  margin: 10px 0 6px 0;
  letter-spacing: -0.005em;
}
.principles p {
  color: var(--muted);
  font-size: 14.5px;
  margin: 0;
}
@media (max-width: 1000px) {
  .principles { grid-template-columns: repeat(2, 1fr); }
  .principles li { border-right: none; border-bottom: 1px solid var(--line-2); padding-right: 24px; }
  .principles li:nth-child(odd) { border-right: 1px solid var(--line-2); }
}
@media (max-width: 560px) {
  .principles { grid-template-columns: 1fr; }
  .principles li { border-right: none !important; }
}

/* ---------- How it works ---------- */
.stack { display: grid; gap: 28px; }
.block {
  border: 1px solid var(--line);
  background: var(--bg-elev);
  padding: 24px 26px;
  border-radius: var(--radius);
}
.block-title {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 20px;
  margin: 0 0 10px 0;
  letter-spacing: -0.005em;
}
.block-k {
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-right: 10px;
  padding: 2px 6px;
  background: var(--accent-soft);
  border-radius: 2px;
}
.block p { margin: 0; color: var(--ink-2); }

.roles {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 14px;
}
.role {
  border: 1px solid var(--line-2);
  padding: 14px 14px;
  border-radius: var(--radius);
  background: var(--bg);
}
.role-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 6px;
}
.role-name { font-weight: 600; font-size: 15px; }
.role-tag {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}
.role p { margin: 0; color: var(--ink-2); font-size: 14.5px; }
@media (max-width: 760px) {
  .roles { grid-template-columns: 1fr; }
}

/* ---------- Architecture table ---------- */
.arch-table {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-elev);
  overflow: hidden;
}
.arch-row {
  display: grid;
  grid-template-columns: 220px 1fr 60px;
  gap: 24px;
  padding: 16px 22px;
  border-top: 1px solid var(--line-2);
  align-items: baseline;
}
.arch-row:first-child { border-top: none; }
.arch-head {
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
  background: var(--bg);
  padding: 12px 22px;
}
.arch-name {
  font-family: var(--serif);
  font-size: 18px;
  letter-spacing: -0.005em;
}
.arch-row > div:nth-child(2) { color: var(--ink-2); }
.mono {
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--muted);
  text-align: right;
}
@media (max-width: 640px) {
  .arch-row { grid-template-columns: 1fr 40px; }
  .arch-row > div:nth-child(2) { grid-column: 1 / -1; color: var(--muted); font-size: 14px; }
}

/* ---------- Workflow steps ---------- */
.steps {
  list-style: none;
  padding: 0;
  margin: 0;
  counter-reset: step;
}
.steps li {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 16px;
  padding: 18px 0;
  border-top: 1px solid var(--line-2);
}
.steps li:first-child { border-top: 1px solid var(--line); }
.steps li:last-child { border-bottom: 1px solid var(--line); }
.step-n {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--muted);
  padding-top: 2px;
}
.steps h4 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 18px;
  margin: 0 0 4px 0;
  letter-spacing: -0.005em;
}
.steps p { margin: 0; color: var(--ink-2); font-size: 15px; }

/* ---------- Compare ---------- */
.compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin-top: 24px;
}
.compare-col {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
  background: var(--bg-elev);
}
.compare-col.highlight {
  border-color: var(--ink);
  background: var(--bg);
}
.compare-head {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 10px;
}
.compare-col.highlight .compare-head { color: var(--accent); }
.compare-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.compare-col li {
  padding: 8px 0;
  border-top: 1px dashed var(--line-2);
  color: var(--ink-2);
  font-size: 15px;
}
.compare-col li:first-child { border-top: none; }
@media (max-width: 720px) {
  .compare { grid-template-columns: 1fr; }
}

/* ---------- Contact ---------- */
.contact .checklist ol {
  margin: 10px 0 22px 0;
  padding-left: 20px;
  color: var(--ink-2);
}
.contact .checklist li { padding: 4px 0; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 28px 0;
  background: var(--bg);
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 13px;
  color: var(--muted);
}
.foot-col { display: flex; align-items: center; gap: 8px; }
.foot-col.right { margin-left: auto; }
.foot-col.mono, .mono { font-family: var(--mono); }

/* ---------- Selection ---------- */
::selection {
  background: var(--mark);
  color: var(--ink);
}