/*
 * MRKTN.io — Editorial Ledger
 * Paper, ink, hairlines. Serif display, mono figures. No shadows, no glass, no glow.
 */

@import url('https://fonts.googleapis.com/css2?family=Newsreader:ital,opsz,wght@0,6..72,400;0,6..72,500;0,6..72,600;1,6..72,400;1,6..72,500&family=Inter:wght@400;500;600&family=IBM+Plex+Mono:wght@400;500&display=swap');

:root {
  --paper: #faf8f4;
  --ink: #161412;
  --ink-soft: #57514a;
  --ink-faint: #8a847c;
  --rule: rgba(22, 20, 18, 0.16);
  --rule-strong: var(--ink);
  --accent: #b3261e;

  --serif: 'Newsreader', Georgia, serif;
  --sans: 'Inter', -apple-system, sans-serif;
  --mono: 'IBM Plex Mono', 'Courier New', monospace;

  --max-width: 1120px;
  --pad: 24px;
  --header-h: 64px;
}

@media (max-width: 760px) {
  :root {
    --header-h: 102px;
    --pad: 32px;
  }
}

/* Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 20px);
  overflow-x: clip;
}

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: var(--serif);
  font-weight: 500;
  line-height: 1.12;
  letter-spacing: -0.01em;
}

h4, h5 {
  font-family: var(--sans);
  font-weight: 600;
}

p {
  color: var(--ink-soft);
}

a {
  color: inherit;
  text-decoration: none;
}

em {
  font-family: var(--serif);
}

:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 3px;
}

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding-left: max(var(--pad), env(safe-area-inset-left));
  padding-right: max(var(--pad), env(safe-area-inset-right));
  width: 100%;
}

/* Skip link */
.skip-link {
  position: absolute;
  top: -100px;
  left: 0;
  background: var(--ink);
  color: var(--paper);
  padding: 8px 16px;
  z-index: 100;
  font-family: var(--mono);
  font-size: 0.8rem;
}
.skip-link:focus {
  top: 0;
}

/* Mono label utility */
.kicker {
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
  display: block;
}

/* ---------- Header ---------- */
.header-nav {
  position: sticky;
  top: 0;
  background: var(--paper);
  border-bottom: 1px solid var(--rule-strong);
  z-index: 50;
}

.nav-wrap {
  display: flex;
  align-items: center;
  gap: 32px;
  height: var(--header-h);
}

.logo {
  font-family: var(--serif);
  font-size: 1.45rem;
  font-weight: 600;
  letter-spacing: 0;
  flex-shrink: 0;
}

.logo span {
  color: var(--accent);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
  margin-left: auto;
}

.nav-menu a {
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  white-space: nowrap;
}

.nav-menu a:hover,
.nav-menu a.active {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

.nav-cta {
  padding: 9px 18px;
  flex-shrink: 0;
}

/* Mobile: logo + CTA on top, full nav as a swipeable row below. No hamburger. */
@media (max-width: 760px) {
  .nav-wrap {
    height: auto;
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: center;
    gap: 0;
    padding-top: 12px;
  }

  .logo {
    grid-row: 1;
    grid-column: 1;
  }

  .nav-cta {
    grid-row: 1;
    grid-column: 2;
    justify-self: end;
  }

  .nav-menu {
    grid-row: 2;
    grid-column: 1 / -1;
    margin: 12px 0 0 0;
    padding: 11px 0;
    gap: 24px;
    border-top: 1px solid var(--rule);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .nav-menu::-webkit-scrollbar {
    display: none;
  }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 26px;
  font-family: var(--mono);
  font-size: 0.76rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  cursor: pointer;
  border: 1px solid var(--ink);
  border-radius: 0;
  background: transparent;
  color: var(--ink);
  transition: background 0.15s ease, color 0.15s ease;
}

.btn-primary {
  background: var(--ink);
  color: var(--paper);
}

.btn-primary:hover {
  background: var(--paper);
  color: var(--ink);
}

.btn-secondary:hover {
  background: var(--ink);
  color: var(--paper);
}

/* ---------- Hero ---------- */
.hero {
  padding-top: 110px;
  padding-bottom: 80px;
}

.hero .kicker {
  margin-bottom: 28px;
}

.hero-title {
  font-size: clamp(2.7rem, 6.5vw, 5rem);
  max-width: 18ch;
  margin-bottom: 32px;
}

.hero-title em {
  font-style: italic;
  font-weight: 500;
}

.hero-description {
  max-width: 62ch;
  font-size: 1.08rem;
  margin-bottom: 44px;
}

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

/* ---------- Ledger table ---------- */
.ledger {
  border-top: 1px solid var(--rule-strong);
  border-bottom: 1px solid var(--rule-strong);
  padding: 10px 0;
  margin-bottom: 0;
}

.ledger-row {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 12px 0;
}

.ledger-row + .ledger-row {
  border-top: 1px solid var(--rule);
}

.ledger-label {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
  white-space: nowrap;
}

.ledger-leader {
  flex: 1;
  border-bottom: 1px dotted var(--ink-faint);
  transform: translateY(-4px);
}

.ledger-value {
  font-family: var(--mono);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--ink);
  white-space: nowrap;
}

.ledger-note {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--ink-faint);
  padding-top: 14px;
}

/* ---------- Sections ---------- */
.section {
  padding-top: 96px;
  padding-bottom: 96px;
}

.section-rule {
  border-top: 1px solid var(--rule-strong);
}

.section-head {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 24px;
  align-items: baseline;
  margin-bottom: 56px;
}

.section-no {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--ink-faint);
}

.section-title {
  font-size: clamp(1.9rem, 3.6vw, 2.7rem);
}

.section-sub {
  grid-column: 2;
  max-width: 60ch;
  margin-top: 12px;
}

@media (max-width: 640px) {
  .section-head {
    grid-template-columns: 1fr;
    gap: 8px;
  }
  .section-sub {
    grid-column: 1;
  }
}

/* ---------- Claims (three editorial blocks) ---------- */
.claims-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 48px;
}

@media (max-width: 880px) {
  .claims-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

.claim {
  border-top: 1px solid var(--rule-strong);
  padding-top: 24px;
}

.claim .kicker {
  margin-bottom: 18px;
}

.claim h3 {
  font-size: 1.45rem;
  margin-bottom: 14px;
}

.claim p {
  font-size: 0.95rem;
  margin-bottom: 20px;
}

.claim a {
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--ink);
  padding-bottom: 2px;
}

.claim a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ---------- Service index rows ---------- */
.index-rows {
  border-bottom: 1px solid var(--rule-strong);
}

.index-row {
  display: grid;
  grid-template-columns: 80px 1fr 1.4fr;
  gap: 24px;
  padding: 44px 0;
  border-top: 1px solid var(--rule-strong);
}

@media (max-width: 760px) {
  .index-row {
    grid-template-columns: 1fr;
    gap: 12px;
    padding: 32px 0;
  }
}

.index-no {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--ink-faint);
  padding-top: 6px;
}

.index-row h3 {
  font-size: 1.6rem;
  max-width: 14ch;
}

.index-row p {
  font-size: 0.98rem;
}

/* ---------- Q&A (native details) ---------- */
.qa-list {
  border-bottom: 1px solid var(--rule-strong);
}

.qa-list details {
  border-top: 1px solid var(--rule-strong);
}

.qa-list summary {
  list-style: none;
  cursor: pointer;
  padding: 26px 0;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 24px;
  font-family: var(--serif);
  font-size: 1.35rem;
  font-weight: 500;
  user-select: none;
}

.qa-list summary::-webkit-details-marker {
  display: none;
}

.qa-list summary::after {
  content: '+';
  font-family: var(--mono);
  font-size: 1rem;
  color: var(--ink-faint);
}

.qa-list details[open] summary::after {
  content: '\2212'; /* minus sign */
}

.qa-list .qa-body {
  padding: 0 0 30px 0;
  max-width: 68ch;
}

.qa-body p + p,
.qa-body ul + p,
.qa-body p + ul {
  margin-top: 14px;
}

.qa-body ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.qa-body li {
  color: var(--ink-soft);
  font-size: 0.97rem;
  padding-left: 22px;
  position: relative;
}

.qa-body li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--ink-faint);
}

.takeaway {
  font-family: var(--serif);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--ink);
}

/* ---------- Stage timeline (Distribution 101) ---------- */
.timeline {
  position: relative;
  max-width: 820px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--rule-strong);
}

.tl-stage {
  position: relative;
  padding: 0 0 72px 52px;
}

.tl-stage:last-child {
  padding-bottom: 0;
}

.tl-stage::before {
  content: '';
  position: absolute;
  left: 0;
  top: 5px;
  width: 13px;
  height: 13px;
  background: var(--paper);
  border: 1px solid var(--ink);
}

.tl-stage.tl-key::before {
  background: var(--accent);
  border-color: var(--accent);
}

.tl-stage .kicker {
  margin-bottom: 10px;
}

.tl-stage h3 {
  font-size: 1.7rem;
  margin-bottom: 10px;
}

.tl-context {
  font-size: 0.97rem;
  max-width: 60ch;
  margin-bottom: 24px;
}

.tl-stage .qa-list summary {
  font-size: 1.15rem;
}

/* Locked stages (gated behind the worksheet) */
.tl-stage.tl-locked::before {
  border-style: dashed;
}

.tl-locked .qa-list,
.tl-locked .tl-context {
  opacity: 0.4;
}

.tl-locked .qa-list {
  pointer-events: none;
  user-select: none;
}

.lock-tag {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
  border: 1px dashed var(--ink-faint);
  padding: 3px 9px;
  margin-left: 12px;
  vertical-align: middle;
  white-space: nowrap;
}

.unlock-note {
  font-family: var(--mono);
  font-size: 0.74rem;
  color: var(--ink-soft);
  margin-top: 16px;
}

.unlock-note a {
  border-bottom: 1px solid var(--ink);
  color: var(--ink);
}

.unlock-note a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* Commitment block */
.commit-state {
  font-family: var(--mono);
  font-size: 0.74rem;
  color: var(--ink-soft);
  margin-top: 16px;
}

.commit-state.signed {
  color: var(--accent);
}

/* ---------- Letter (1923) ---------- */
.letter {
  max-width: 660px;
}

.letter p {
  font-family: var(--serif);
  font-size: 1.18rem;
  line-height: 1.75;
  color: var(--ink);
  margin-bottom: 26px;
}

.letter p.aside {
  font-family: var(--sans);
  font-size: 0.95rem;
  color: var(--ink-soft);
}

.letter .pull {
  font-size: 1.5rem;
  font-weight: 500;
  font-style: italic;
  border-left: 3px solid var(--accent);
  padding-left: 24px;
  margin: 40px 0;
}

.letter-sig {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-top: 40px;
}

/* ---------- Capability grid ---------- */
.cap-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-top: 1px solid var(--rule-strong);
  border-left: 1px solid var(--rule-strong);
}

@media (max-width: 760px) {
  .cap-grid {
    grid-template-columns: 1fr;
  }
}

.cap-cell {
  padding: 36px 32px;
  border-right: 1px solid var(--rule-strong);
  border-bottom: 1px solid var(--rule-strong);
}

.cap-cell h4 {
  font-family: var(--serif);
  font-size: 1.3rem;
  font-weight: 500;
  margin-bottom: 12px;
}

.cap-cell p {
  font-size: 0.93rem;
}

/* ---------- Memo block (CMO / CTA) ---------- */
.memo {
  border: 1px solid var(--rule-strong);
  padding: 64px 56px;
  max-width: 860px;
  margin: 0 auto;
}

@media (max-width: 640px) {
  .memo {
    padding: 40px 24px;
  }
}

.memo .kicker {
  margin-bottom: 20px;
}

.memo h2 {
  font-size: clamp(1.7rem, 3.4vw, 2.4rem);
  margin-bottom: 20px;
  max-width: 24ch;
}

.memo p {
  max-width: 60ch;
  margin-bottom: 32px;
}

.memo-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid var(--rule-strong);
  padding: 64px 0 40px 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 56px;
}

@media (max-width: 760px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }
}

.footer-brand h4 {
  font-family: var(--serif);
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 14px;
}

.footer-brand h4 span {
  color: var(--accent);
}

.footer-brand p {
  max-width: 38ch;
  font-size: 0.92rem;
}

.footer-nav h5 {
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 18px;
}

.footer-nav ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-nav a {
  font-size: 0.92rem;
  color: var(--ink-soft);
  border-bottom: 1px solid transparent;
}

.footer-nav a:hover {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

.colophon {
  font-family: var(--mono);
  font-size: 0.72rem;
  line-height: 1.9;
  color: var(--ink-faint);
  max-width: 62ch;
  margin-bottom: 28px;
}

.colophon a {
  color: var(--ink-soft);
  border-bottom: 1px solid var(--ink-soft);
}

.colophon a:hover {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

.footer-bottom {
  border-top: 1px solid var(--rule);
  padding-top: 28px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--ink-faint);
}

@media (max-width: 576px) {
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

.footer-bottom-links {
  display: flex;
  gap: 24px;
}

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

/* ---------- University specifics ---------- */
.status-tag {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
  border: 1px solid var(--rule);
  padding: 4px 10px;
  display: inline-block;
  white-space: nowrap;
  justify-self: start;
  align-self: start;
  margin-top: 8px;
}

.status-tag.live {
  color: var(--accent);
  border-color: var(--accent);
}

.index-row.track-row {
  grid-template-columns: 170px 1fr 1.4fr;
}

@media (max-width: 760px) {
  .index-row.track-row {
    grid-template-columns: 1fr;
  }
}

.notice {
  border: 1px solid var(--rule-strong);
  border-left: 4px solid var(--accent);
  padding: 40px 44px;
  max-width: 860px;
}

@media (max-width: 640px) {
  .notice {
    padding: 28px 22px;
  }
}

.notice h4 {
  font-family: var(--serif);
  font-size: 1.35rem;
  font-weight: 500;
  margin-bottom: 14px;
}

.notice p {
  font-size: 0.97rem;
  margin-bottom: 16px;
  max-width: 70ch;
}

.notice .btn {
  margin-top: 8px;
}

.syllabus {
  border-bottom: 1px solid var(--rule-strong);
}

.syllabus details {
  border-top: 1px solid var(--rule-strong);
}

.syllabus summary {
  list-style: none;
  cursor: pointer;
  padding: 26px 0;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 24px;
  font-family: var(--serif);
  font-size: 1.35rem;
  font-weight: 500;
  user-select: none;
}

.syllabus summary::-webkit-details-marker {
  display: none;
}

.syllabus summary::after {
  content: '+';
  font-family: var(--mono);
  font-size: 1rem;
  color: var(--ink-faint);
}

.syllabus details[open] summary::after {
  content: '\2212';
}

.syllabus ul {
  list-style: none;
  padding: 0 0 30px 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-width: 68ch;
}

.syllabus li {
  color: var(--ink-soft);
  font-size: 0.97rem;
  padding-left: 22px;
  position: relative;
}

.syllabus li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--ink-faint);
}

/* ---------- Mobile rhythm & overflow fixes ---------- */
@media (max-width: 760px) {
  .section {
    padding-top: 64px;
    padding-bottom: 64px;
  }

  .hero {
    padding-top: 56px;
    padding-bottom: 48px;
  }

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

  .tl-stage {
    padding-left: 38px;
    padding-bottom: 56px;
  }

  .letter p {
    font-size: 1.1rem;
  }

  .letter .pull {
    font-size: 1.3rem;
    padding-left: 18px;
  }
}

/* Ledger rows: wrap instead of overflow on narrow screens */
@media (max-width: 640px) {
  .ledger-label,
  .ledger-value {
    white-space: normal;
  }

  .ledger-value {
    text-align: right;
  }

  .ledger-leader {
    min-width: 24px;
  }
}

/* Stack CTAs full-width on small phones */
@media (max-width: 520px) {
  .hero-actions .btn,
  .memo-actions .btn {
    width: 100%;
  }
}