:root {
  --paper: #f9f7f4;
  --surface: #ffffff;
  --ink: #1a1a1a;
  --muted: #5c5c5c;
  --rule: #d9d4cd;
  --rule-strong: #bcb6ad;
  --accent: #1f4e79;
  --max-width: 1240px;
  --reading-width: 70ch;
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(180deg, rgba(10, 10, 10, 0.015) 0, rgba(10, 10, 10, 0) 180px),
    repeating-linear-gradient(0deg, rgba(0, 0, 0, 0.008), rgba(0, 0, 0, 0.008) 1px, transparent 1px, transparent 28px),
    var(--paper);
  font-family: "Source Serif 4", Georgia, "Times New Roman", serif;
  line-height: 1.65;
}

img {
  max-width: 100%;
}

h1,
h2,
h3 {
  margin: 0 0 10px;
  color: #111;
  line-height: 1.15;
}

h1 {
  font-family: "Source Serif 4", Georgia, serif;
  font-weight: 700;
  letter-spacing: -0.01em;
  font-size: clamp(2rem, 4.3vw, 3.35rem);
}

h2 {
  font-family: "Libre Franklin", Arial, sans-serif;
  font-weight: 700;
  font-size: 0.86rem;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  border-top: 2px solid #111;
  padding-top: 10px;
  margin-bottom: 18px;
}

h3 {
  font-family: "Source Serif 4", Georgia, serif;
  font-size: clamp(1.08rem, 1.65vw, 1.34rem);
  font-weight: 600;
}

p,
li {
  font-size: clamp(1rem, 1.1vw, 1.08rem);
  color: var(--ink);
}

a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 0.14em;
}

a:hover {
  color: #0f365a;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 12;
  background: rgba(249, 247, 244, 0.97);
  backdrop-filter: blur(4px);
  border-bottom: 1px solid #111;
}

.topbar-inner {
  width: min(var(--max-width), 94%);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 80px 1fr auto auto;
  align-items: center;
  column-gap: 20px;
  padding: 9px 0;
}

.brand {
  font-family: "Libre Franklin", Arial, sans-serif;
  font-weight: 800;
  letter-spacing: 0.09em;
  font-size: 0.9rem;
  color: #111;
  border: 1px solid #111;
  background: transparent;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  display: grid;
  place-items: center;
}

.top-nav {
  display: flex;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
}

.top-nav a,
.mobile-nav a {
  font-family: "Libre Franklin", Arial, sans-serif;
  font-size: 0.78rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: #1f1f1f;
  text-decoration: none;
}

.top-nav a:hover,
.mobile-nav a:hover {
  text-decoration: underline;
  text-decoration-thickness: 1px;
}

.contact-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: "Libre Franklin", Arial, sans-serif;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  color: #111;
  border: 1px solid #111;
  padding: 7px 11px;
  background: transparent;
}

.contact-btn:hover {
  text-decoration: none;
  background: #111;
  color: #fff;
}

.menu-toggle {
  display: none;
  width: 40px;
  height: 36px;
  border: 1px solid #111;
  border-radius: 0;
  background: transparent;
  padding: 6px;
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  margin: 4px 0;
  background: #111;
}

.mobile-nav {
  display: none;
  width: min(var(--max-width), 94%);
  margin: 0 auto;
  border-bottom: 1px solid #111;
  padding-bottom: 8px;
}

.mobile-nav a {
  display: block;
  padding: 9px 0;
  border-top: 1px solid var(--rule);
}

.mobile-nav.is-open {
  display: block;
}

.page-wrap {
  width: min(var(--max-width), 94%);
  margin: 18px auto 52px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 0;
  box-shadow: none;
  overflow: hidden;
}

.profile-hero {
  margin-bottom: 22px;
  border-top: 3px double #111;
}

.cover-gradient {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 3;
  object-fit: contain;
  object-position: center center;
}

.profile-main {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 22px;
  padding: 18px 26px 24px;
  border-top: 1px solid var(--rule);
}

.avatar {
  width: 120px;
  height: 120px;
  border-radius: 0;
  object-fit: cover;
  object-position: center;
  border: 1px solid #111;
  background: #ece7e0;
}

.identity {
  max-width: 95ch;
}

.headline {
  max-width: var(--reading-width);
  font-size: clamp(1.03rem, 1.45vw, 1.22rem);
  line-height: 1.45;
  margin: 10px 0 14px;
}

.meta,
.subtle {
  color: var(--muted);
  font-family: "Libre Franklin", Arial, sans-serif;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.entity-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.entity-links span {
  font-family: "Libre Franklin", Arial, sans-serif;
  font-size: 0.73rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #383838;
  border-top: 1px solid var(--rule-strong);
  padding-top: 6px;
}

.content-grid {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(270px, 1fr);
  gap: 24px;
  align-items: start;
}

.section {
  padding: 18px 22px;
  margin-bottom: 18px;
}

.main-column .section p,
.main-column .section li {
  max-width: var(--reading-width);
}

.section ul {
  margin: 12px 0 0;
  padding-left: 22px;
}

.timeline-item,
.publication,
.edu-item {
  padding: 14px 0;
  border-top: 1px solid var(--rule);
}

.timeline-item:first-of-type,
.publication:first-of-type,
.edu-item:first-of-type {
  border-top: none;
  padding-top: 4px;
}

.post p,
.publication p,
.timeline-item p,
.edu-item p {
  margin: 6px 0 0;
  color: #232323;
}

.publication p:last-child {
  margin-top: 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.publication a {
  font-family: "Libre Franklin", Arial, sans-serif;
  font-size: 0.77rem;
  letter-spacing: 0.045em;
  text-transform: uppercase;
}

.qr-section {
  margin-top: 2px;
  text-align: center;
  border-top: 2px solid #111;
}

.qr-section p {
  margin: 0 auto;
}

.qr-link {
  display: inline-block;
  margin-top: 12px;
  padding: 10px;
  border: 1px solid #111;
  background: #fff;
}

.qr-link img {
  display: block;
  width: 220px;
  height: 220px;
  max-width: 100%;
}

.card:focus-within,
.card:hover {
  border-color: var(--rule-strong);
}

.book-page .topbar-inner {
  display: flex;
  justify-content: center;
  grid-template-columns: none;
}

.book-hero {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 22px;
  align-items: start;
  padding: 22px;
}

.book-cover {
  width: 220px;
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: 0;
  border: 1px solid var(--rule-strong);
  box-shadow: none;
  background: #fff;
}

.book-meta {
  margin-top: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.book-meta span {
  display: inline-block;
  font-family: "Libre Franklin", Arial, sans-serif;
  font-size: 0.73rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #383838;
  border-top: 1px solid var(--rule-strong);
  padding-top: 6px;
}

.book-sections {
  display: grid;
  grid-template-columns: 1.45fr 1fr;
  gap: 18px;
  align-items: start;
}

.spec-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.spec-list li {
  padding: 10px 0;
  border-top: 1px solid var(--rule);
  color: #232323;
}

.spec-list li:first-child {
  border-top: none;
  padding-top: 4px;
}

.cta-row {
  margin-top: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.cta-row a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: "Libre Franklin", Arial, sans-serif;
  font-size: 0.77rem;
  letter-spacing: 0.045em;
  text-transform: uppercase;
  text-decoration: none;
  color: #111;
  border: 1px solid #111;
  padding: 8px 12px;
  background: #fff;
}

.cta-row a:hover {
  color: #fff;
  background: #111;
}

.cta-row a.primary {
  background: #111;
  color: #fff;
}

.cta-row a.primary:hover {
  filter: brightness(1.12);
}

@media (max-width: 1080px) {
  .topbar-inner {
    grid-template-columns: 66px 1fr auto auto;
    column-gap: 14px;
  }

  .top-nav {
    gap: 16px;
  }

  .content-grid {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .side-column {
    display: grid;
    grid-template-columns: 1fr;
  }

  .book-sections {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 860px) {
  .top-nav,
  .contact-btn {
    display: none;
  }

  .topbar-inner {
    grid-template-columns: 1fr auto;
  }

  .menu-toggle {
    display: inline-block;
  }

  .profile-main {
    grid-template-columns: 92px 1fr;
    padding: 16px 18px 20px;
    gap: 15px;
  }

  .avatar {
    width: 88px;
    height: 88px;
  }

  .section {
    padding: 16px;
    margin-bottom: 14px;
  }

  .qr-link img {
    width: 190px;
    height: 190px;
  }

  .book-hero {
    grid-template-columns: 1fr;
    padding: 16px;
    gap: 14px;
  }

  .book-cover {
    width: min(240px, 100%);
  }
}

@media (max-width: 560px) {
  .topbar {
    position: static;
  }

  .page-wrap {
    width: 95%;
    margin-top: 12px;
    margin-bottom: 34px;
  }

  h1 {
    font-size: clamp(1.6rem, 8.2vw, 2.15rem);
  }

  .cover-gradient {
    aspect-ratio: 16 / 5;
  }

  .profile-main {
    grid-template-columns: 1fr;
  }

  .headline,
  p,
  li {
    font-size: 1rem;
  }

  .entity-links {
    gap: 10px;
  }

  .entity-links span {
    font-size: 0.71rem;
  }

  .qr-link img {
    width: 168px;
    height: 168px;
  }
}