/* ============================================================
   Stanford Entrepreneurs — site stylesheet
   Editorial × Stanford academic
   ============================================================ */

:root {
  --paper:        #F4F1EA;
  --paper-warm:   #EDE8DC;
  --ink:          #1A1A1A;
  --ink-soft:     #2C2A26;
  --muted:        #6B6358;
  --rule:         #C9C2B2;
  --rule-soft:    #DDD7C8;
  --stanford:     #8C1515;

  --serif: "EB Garamond", "Cormorant Garamond", Georgia, "Times New Roman", serif;
  --sans:  "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --mono:  "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;

  --measure: 36rem;        /* ideal reading width */
  --gutter:  2.5rem;
  --frame:   clamp(1.25rem, 4vw, 3.5rem);
}

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
img, svg { display: block; max-width: 100%; }
a { color: inherit; }

/* ---------- base ---------- */
html {
  font-size: 17px;
  -webkit-text-size-adjust: 100%;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-feature-settings: "kern", "liga", "onum";
  line-height: 1.55;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

/* ---------- nav ---------- */
.site-nav {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  padding: 1.5rem var(--frame) 1.25rem;
  border-bottom: 1px solid var(--rule);
  background: var(--paper);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  background: rgba(244, 241, 234, 0.92);
}

.wordmark {
  font-family: var(--serif);
  text-decoration: none;
  color: var(--ink);
  display: block;
  line-height: 1;
}
.wordmark .name {
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}
.wordmark .working {
  display: block;
  margin-top: 0.4rem;
  font-family: var(--sans);
  font-size: 0.62rem;
  font-style: italic;
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.nav-links {
  display: flex;
  gap: 1.75rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--sans);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  align-items: center;
}
.nav-links a {
  text-decoration: none;
  color: var(--ink);
  padding-bottom: 0.2rem;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s ease;
}
.nav-links a:hover { border-bottom-color: var(--stanford); }
.nav-links a.is-current { border-bottom-color: var(--ink); }

/* ---------- main column ---------- */
main {
  flex: 1;
  padding: 0 var(--frame);
}

.page {
  max-width: 64rem;
  margin: 0 auto;
  padding: 4rem 0 6rem;
}

.page-narrow {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 4rem 0 6rem;
}

/* ---------- page-head ---------- */
.page-head {
  margin-bottom: 4rem;
  position: relative;
}

.kicker {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 1.5rem;
}

.kicker .roman {
  color: var(--stanford);
  margin-right: 0.6em;
}

h1.display {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(2.6rem, 5.4vw, 4.4rem);
  line-height: 1.02;
  letter-spacing: -0.015em;
  margin: 0 0 1.5rem;
}

.standfirst {
  font-family: var(--serif);
  font-style: italic;
  font-size: clamp(1.2rem, 1.6vw, 1.45rem);
  line-height: 1.45;
  max-width: 38rem;
  color: var(--ink-soft);
  margin: 0;
}

/* ---------- body type ---------- */
.prose {
  max-width: var(--measure);
  margin: 0 auto;
}

.prose > * + * { margin-top: 1.1em; }
.prose h2 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 1.6rem;
  letter-spacing: -0.01em;
  margin-top: 3.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
  line-height: 1.2;
}
.prose h2 .num {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--stanford);
  display: block;
  margin-bottom: 0.7rem;
}
.prose h3 {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink);
  margin-top: 2.5rem;
  margin-bottom: 0.4rem;
}
.prose p {
  font-size: 1.12rem;
  line-height: 1.65;
  margin: 0;
}
.prose blockquote {
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.35rem;
  line-height: 1.45;
  margin: 2.2rem 0;
  padding-left: 1.2rem;
  border-left: 2px solid var(--stanford);
  color: var(--ink-soft);
}
.prose ul, .prose ol {
  font-size: 1.08rem;
  line-height: 1.6;
  padding-left: 1.2rem;
}
.prose li + li { margin-top: 0.4em; }
.prose hr {
  border: 0;
  border-top: 1px solid var(--rule);
  margin: 3rem 0;
}

/* small caps inline */
.sc {
  font-variant: small-caps;
  letter-spacing: 0.04em;
}

/* ---------- masthead / front matter ---------- */
.cover {
  padding: 5rem 0 4rem;
  text-align: left;
  border-bottom: 1px solid var(--rule);
}
.cover .masthead-line {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0;
}
.cover .title-stack {
  margin: 1.5rem 0 2rem;
}
.cover .title-stack .title {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(3.5rem, 9vw, 7rem);
  line-height: 0.92;
  letter-spacing: -0.025em;
  margin: 0;
}
.cover .title-stack .title em {
  font-style: italic;
  color: var(--ink-soft);
}
.cover .pulled-quote {
  font-family: var(--serif);
  font-style: italic;
  font-size: clamp(1.35rem, 2vw, 1.7rem);
  line-height: 1.4;
  max-width: 32rem;
  color: var(--ink);
  margin: 2rem 0 0;
}

/* three masthead axioms */
.axioms {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2.5rem;
  padding: 5rem 0;
  border-bottom: 1px solid var(--rule);
}
.axiom .label {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--stanford);
  margin: 0 0 1rem;
}
.axiom .text {
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.15rem;
  line-height: 1.4;
  color: var(--ink);
  margin: 0;
}
@media (max-width: 800px) {
  .axioms { grid-template-columns: 1fr; gap: 2rem; padding: 3rem 0; }
}

/* contents — magazine table of contents */
.contents {
  padding: 4rem 0;
  border-bottom: 1px solid var(--rule);
}
.contents .head {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 2.5rem;
}
.contents ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}
.contents li {
  display: grid;
  grid-template-columns: 4rem 1fr auto;
  gap: 1.5rem;
  padding: 1.4rem 0;
  border-top: 1px solid var(--rule-soft);
  align-items: baseline;
}
.contents li:last-child { border-bottom: 1px solid var(--rule-soft); }
.contents li .num {
  font-family: var(--mono);
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  color: var(--stanford);
}
.contents li .title {
  font-family: var(--serif);
  font-size: 1.45rem;
  line-height: 1.2;
  font-weight: 500;
  text-decoration: none;
  color: var(--ink);
}
.contents li .title:hover { color: var(--stanford); }
.contents li .desc {
  font-family: var(--serif);
  font-style: italic;
  font-size: 1rem;
  color: var(--muted);
  margin-top: 0.35rem;
  max-width: 28rem;
}
.contents li .meta {
  font-family: var(--sans);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  text-align: right;
}
@media (max-width: 700px) {
  .contents li { grid-template-columns: 3rem 1fr; }
  .contents li .meta { grid-column: 1 / -1; text-align: left; padding-left: 0; }
}

/* ---------- section-specific registers ---------- */

/* signals = sans-serif, compressed, numbered */
.signals-list {
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--sans);
}
.signals-list li {
  display: grid;
  grid-template-columns: 3rem 1fr;
  gap: 1.25rem;
  padding: 1.5rem 0;
  border-top: 1px solid var(--rule-soft);
  font-size: 1.02rem;
  line-height: 1.45;
  color: var(--ink);
}
.signals-list li:last-child { border-bottom: 1px solid var(--rule-soft); }
.signals-list .n {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--stanford);
  padding-top: 0.15rem;
}
.signals-list .tag {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-top: 0.5rem;
  display: inline-block;
}

/* playbook = engineering doc */
.playbook-block {
  font-family: var(--sans);
  background: var(--paper-warm);
  padding: 2rem;
  margin: 2.5rem 0;
  border-left: 3px solid var(--ink);
}
.playbook-block .label {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 1rem;
}
.playbook-block .title {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 1.1rem;
  margin: 0 0 1rem;
  color: var(--ink);
}
.playbook-block p,
.playbook-block li {
  font-family: var(--sans);
  font-size: 0.94rem;
  line-height: 1.55;
}

/* predictions — three columns, three timescales */
.predictions {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2.5rem;
  margin: 3rem 0;
}
.prediction {
  border-top: 2px solid var(--ink);
  padding-top: 1.25rem;
}
.prediction .scale {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--stanford);
  margin: 0 0 0.5rem;
}
.prediction .span {
  font-family: var(--serif);
  font-size: 1.35rem;
  font-weight: 500;
  margin: 0 0 1rem;
  color: var(--ink);
}
.prediction .from {
  font-family: var(--sans);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin: 0 0 0.5rem;
}
.prediction .desc {
  font-family: var(--serif);
  font-size: 1.02rem;
  line-height: 1.5;
  color: var(--ink-soft);
  font-style: italic;
}
@media (max-width: 800px) {
  .predictions { grid-template-columns: 1fr; }
}

/* founder stories — large serif portrait-style */
.story-card {
  padding: 3.5rem 0;
  border-top: 1px solid var(--rule);
}
.story-card .role {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 1rem;
}
.story-card .hook {
  font-family: var(--serif);
  font-size: 1.7rem;
  font-style: italic;
  line-height: 1.35;
  margin: 0;
  max-width: 36rem;
  color: var(--ink);
}

/* essay structure */
.essay-rule {
  font-family: var(--sans);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  border-top: 1px solid var(--rule);
  padding-top: 1rem;
  margin-top: 3rem;
}

/* ---------- meta blocks ---------- */
.meta-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem 3rem;
  margin: 3rem 0;
  padding: 2.5rem 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.meta-grid .item .label {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 0.5rem;
}
.meta-grid .item .value {
  font-family: var(--serif);
  font-size: 1.15rem;
  line-height: 1.4;
  margin: 0;
  color: var(--ink);
}
@media (max-width: 700px) {
  .meta-grid { grid-template-columns: 1fr; gap: 1.75rem; }
}

/* ---------- masthead/colophon table ---------- */
.colophon-table {
  width: 100%;
  border-collapse: collapse;
  margin: 2.5rem 0;
}
.colophon-table tr {
  border-top: 1px solid var(--rule-soft);
}
.colophon-table tr:last-child { border-bottom: 1px solid var(--rule-soft); }
.colophon-table td {
  padding: 1rem 0;
  vertical-align: top;
  font-size: 1.02rem;
}
.colophon-table td.role {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  width: 16rem;
  padding-right: 2rem;
}
.colophon-table td.name {
  font-family: var(--serif);
  font-size: 1.1rem;
  color: var(--ink);
}
.colophon-table td.name em {
  font-style: italic;
  color: var(--muted);
  font-size: 0.95rem;
  display: block;
  margin-top: 0.25rem;
}

/* ---------- subscribe / role picker ---------- */
.role-picker {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin: 2.5rem 0;
}
.role-picker label {
  font-family: var(--sans);
  border: 1px solid var(--rule);
  padding: 1.5rem;
  cursor: pointer;
  transition: all 0.15s ease;
  display: block;
  background: var(--paper);
}
.role-picker label:hover {
  border-color: var(--ink);
}
.role-picker input { display: none; }
.role-picker input:checked + .body {
  /* highlight handled by label */
}
.role-picker label:has(input:checked) {
  border-color: var(--stanford);
  background: var(--paper-warm);
}
.role-picker .role-name {
  font-family: var(--serif);
  font-size: 1.25rem;
  font-weight: 500;
  display: block;
  margin-bottom: 0.4rem;
  color: var(--ink);
}
.role-picker .role-path {
  font-family: var(--sans);
  font-size: 0.82rem;
  line-height: 1.5;
  color: var(--muted);
}
.role-picker .role-path strong {
  color: var(--stanford);
  font-weight: 600;
}
@media (max-width: 700px) {
  .role-picker { grid-template-columns: 1fr; }
}

.email-form {
  display: flex;
  gap: 0;
  margin: 2.5rem 0;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}
.email-form input[type="email"] {
  flex: 1;
  background: transparent;
  border: 0;
  padding: 1.1rem 0.5rem 1.1rem 0;
  font-family: var(--serif);
  font-size: 1.15rem;
  color: var(--ink);
  outline: none;
}
.email-form input[type="email"]::placeholder { color: var(--muted); font-style: italic; }
.email-form button {
  background: transparent;
  border: 0;
  padding: 1.1rem 0;
  font-family: var(--sans);
  font-weight: 600;
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.email-form button:hover { color: var(--stanford); }
.email-form button::after { content: "→"; font-size: 1.1rem; }

/* ---------- footer ---------- */
.site-foot {
  border-top: 1px solid var(--rule);
  padding: 2.5rem var(--frame) 3rem;
  margin-top: 4rem;
  font-family: var(--sans);
  font-size: 0.78rem;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}
.site-foot .colophon-line {
  letter-spacing: 0.08em;
}
.site-foot .stamp {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.site-foot a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid var(--rule);
}
.site-foot a:hover { color: var(--ink); border-bottom-color: var(--ink); }

/* ---------- folio (page reference numerals) ---------- */
.folio {
  position: absolute;
  top: 0;
  right: 0;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--muted);
}

/* ---------- small utilities ---------- */
.rule {
  border: 0;
  border-top: 1px solid var(--rule);
  margin: 3rem 0;
}
.rule-thin { border-top: 1px solid var(--rule-soft); }
.rule-red { border-top: 2px solid var(--stanford); width: 3rem; margin: 2rem 0; }

.cap-small {
  font-family: var(--sans);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.next-link {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  border-top: 1px solid var(--rule);
  padding-top: 1.5rem;
  margin-top: 4rem;
  font-family: var(--sans);
  font-size: 0.82rem;
}
.next-link a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 0.1rem;
}
.next-link a:hover { border-bottom-color: var(--stanford); color: var(--stanford); }
.next-link .label {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  display: block;
  margin-bottom: 0.4rem;
}

/* ---------- callout boxes ---------- */
.callout {
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.4rem;
  line-height: 1.4;
  text-align: center;
  padding: 3rem 1rem;
  margin: 3.5rem 0;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  color: var(--ink);
  max-width: 42rem;
  margin-left: auto;
  margin-right: auto;
}