/* ============================================================
   Dr Amena Khatun — Academic Personal Website
   Refined design system: Apple-inspired, editorial, soothing.
   ============================================================ */

:root {
  /* Warm neutrals (Apple Gallery / paper white family) */
  --color-bg: #faf8f4;
  --color-surface: #ffffff;
  --color-surface-alt: #f4f1ec;

  /* Ink + muted text (Apple text gray family) */
  --color-text: #1d1d1f;
  --color-text-soft: #2c2c2e;
  --color-muted: #6e6e73;
  --color-muted-2: #86868b;

  /* Lines / dividers */
  --color-line: #e8e4dc;
  --color-line-strong: #d2d2d7;

  /* Brand depth — refined slate-navy (cooler, more elegant than pure navy) */
  --color-dark: #1c2a3a;
  --color-dark-2: #2a3b50;

  /* Accent — refined warm bronze (less yellow than amber gold) */
  --color-accent: #a07d3c;
  --color-accent-2: #c4a268;
  --color-accent-soft: #f0e8d6;
  --color-accent-tint: rgba(160, 125, 60, 0.08);

  /* Type families */
  --serif: "Fraunces", "Cormorant Garamond", "Times New Roman", Georgia, serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, sans-serif;

  /* Geometry */
  --radius-sm: 6px;
  --radius: 12px;
  --radius-lg: 18px;

  /* Shadows — soft, layered */
  --shadow-xs: 0 1px 2px rgba(28, 42, 58, 0.04);
  --shadow-sm: 0 2px 8px rgba(28, 42, 58, 0.05), 0 1px 2px rgba(28, 42, 58, 0.03);
  --shadow-md: 0 8px 24px rgba(28, 42, 58, 0.06), 0 2px 6px rgba(28, 42, 58, 0.04);
  --shadow-lg: 0 24px 60px rgba(28, 42, 58, 0.10), 0 8px 16px rgba(28, 42, 58, 0.04);

  /* Layout */
  --container: 1160px;
  --container-narrow: 880px;
  --gutter: 1.75rem;
  --section-y: clamp(4rem, 8vw, 7rem);

  --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---------------- Reset & base ---------------- */
*, *::before, *::after { box-sizing: border-box; }
html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}
body {
  margin: 0;
  font-family: var(--sans);
  font-size: 16.5px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-feature-settings: "ss01", "cv11";
}
img { max-width: 100%; display: block; }

a {
  color: var(--color-dark);
  text-decoration: none;
  transition: color .2s var(--ease);
}
a:hover { color: var(--color-accent); }

h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 500;
  color: var(--color-text);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 .6em;
  font-feature-settings: "ss01";
}
h1 {
  font-size: clamp(2.8rem, 6vw, 4.4rem);
  font-weight: 400;
  letter-spacing: -0.035em;
}
h2 {
  font-size: clamp(2rem, 3.6vw, 2.8rem);
  font-weight: 400;
  letter-spacing: -0.025em;
}
h3 {
  font-size: 1.2rem;
  font-weight: 500;
  letter-spacing: -0.015em;
}
h4 {
  font-size: 0.78rem;
  font-family: var(--sans);
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-muted);
}

p { margin: 0 0 1em; }
ul { margin: 0; padding: 0; list-style: none; }
strong { font-weight: 600; color: var(--color-text); }

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

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

/* ---------------- Header / Nav ---------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 248, 244, 0.78);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s var(--ease), background .3s var(--ease);
}
.site-header.scrolled {
  border-bottom-color: var(--color-line);
}
.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: .7rem;
  color: var(--color-text);
  font-weight: 500;
}
.brand:hover { color: var(--color-text); }
.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 34px; height: 34px;
  background: var(--color-dark);
  color: #fff;
  border-radius: 50%;
  font-family: var(--serif);
  font-weight: 500;
  font-size: 0.85rem;
  letter-spacing: 0.02em;
}
.brand-text {
  font-family: var(--serif);
  font-size: 1.05rem;
  font-weight: 500;
  letter-spacing: -0.015em;
}

.primary-nav { display: flex; align-items: center; }
.nav-menu {
  display: flex;
  gap: 2.2rem;
  align-items: center;
}
.nav-menu a {
  font-size: 0.9rem;
  font-weight: 450;
  color: var(--color-text-soft);
  position: relative;
  padding: .25rem 0;
  letter-spacing: -0.005em;
  transition: color .15s var(--ease);
}
.nav-menu a:hover { color: var(--color-accent); }
.nav-menu a.active { color: var(--color-text); }
.nav-menu a.active::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -8px;
  height: 2px;
  background: var(--color-accent);
  border-radius: 2px;
}

.nav-toggle {
  display: none;
  background: none;
  border: 0;
  cursor: pointer;
  padding: .5rem;
}
.nav-toggle span {
  display: block;
  width: 22px; height: 1.5px;
  background: var(--color-text);
  margin: 5px 0;
  transition: transform .2s var(--ease);
  border-radius: 2px;
}

/* ---------------- Hero ---------------- */
.hero {
  padding: clamp(4rem, 9vw, 8rem) 0 clamp(3rem, 6vw, 5rem);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 88% 12%, rgba(160, 125, 60, 0.07), transparent 60%),
    radial-gradient(ellipse 50% 60% at 8% 92%, rgba(28, 42, 58, 0.05), transparent 65%);
  pointer-events: none;
}
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(300px, 1fr);
  gap: clamp(2.5rem, 6vw, 5rem);
  align-items: center;
  position: relative;
}
.eyebrow {
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-accent);
  font-weight: 600;
  margin-bottom: 1.2rem;
}
.hero h1 {
  margin-bottom: 1.5rem;
}
.lede {
  font-family: var(--serif);
  font-size: clamp(1.15rem, 1.55vw, 1.4rem);
  font-weight: 400;
  font-style: italic;
  line-height: 1.5;
  color: var(--color-text-soft);
  max-width: 36ch;
  margin-bottom: 2.5rem;
  letter-spacing: -0.01em;
}
.lede strong {
  font-style: normal;
  font-weight: 500;
  color: var(--color-text);
  background: linear-gradient(transparent 62%, var(--color-accent-soft) 62%);
  padding: 0 0.1em;
}
.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-bottom: 3rem;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: 0.85rem 1.6rem;
  font-size: 0.92rem;
  font-weight: 500;
  font-family: var(--sans);
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all .25s var(--ease);
  letter-spacing: -0.005em;
}
.btn-primary {
  background: var(--color-dark);
  color: #fff;
}
.btn-primary:hover {
  background: var(--color-text);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}
.btn-ghost {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-line-strong);
}
.btn-ghost:hover {
  background: var(--color-text);
  color: #fff;
  border-color: var(--color-text);
}
.hero-meta {
  display: grid;
  gap: .65rem;
  font-size: 0.92rem;
  color: var(--color-muted);
  border-top: 1px solid var(--color-line);
  padding-top: 1.75rem;
  max-width: 34rem;
}
.hero-meta li {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 1rem;
  align-items: baseline;
}
.hero-meta span {
  color: var(--color-text);
  font-weight: 600;
  letter-spacing: 0.1em;
  font-size: 0.7rem;
  text-transform: uppercase;
}

/* Hero card */
.hero-card {
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: 2.25rem 2rem 1.75rem;
  box-shadow: var(--shadow-lg);
  text-align: center;
}
.portrait {
  position: relative;
  width: 200px;
  height: 200px;
  margin: 0 auto 1.75rem;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-dark) 0%, var(--color-dark-2) 100%);
  overflow: hidden;
  box-shadow:
    0 1px 2px rgba(28, 42, 58, 0.1),
    0 12px 36px rgba(28, 42, 58, 0.18);
}
.portrait::after {
  content: "";
  position: absolute;
  inset: -3px;
  border: 1.5px solid rgba(160, 125, 60, 0.5);
  border-radius: 50%;
  pointer-events: none;
}
.portrait img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  display: block;
}
.portrait-monogram {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-family: var(--serif);
  font-size: 4.5rem;
  font-weight: 500;
  color: #fff;
  letter-spacing: 0.02em;
}
.quick-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: .25rem;
  margin: 0 0 .8rem;
  padding: 1.5rem 0 .5rem;
  border-top: 1px solid var(--color-line);
}
.quick-stats div { text-align: center; }
.quick-stats dt {
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-muted);
  margin-bottom: .4rem;
  font-weight: 600;
}
.quick-stats dd {
  margin: 0;
  font-family: var(--serif);
  font-size: 1.85rem;
  font-weight: 400;
  color: var(--color-text);
  line-height: 1;
  letter-spacing: -0.02em;
}
.quick-stats dd span {
  font-size: 1rem;
  color: var(--color-accent);
  vertical-align: super;
  font-weight: 400;
}
.card-note {
  font-size: 0.7rem;
  color: var(--color-muted-2);
  margin: 0;
  letter-spacing: 0.04em;
  font-weight: 500;
}

/* ---------------- Sections ---------------- */
.section {
  padding: var(--section-y) 0;
}
.section-light { background: var(--color-surface-alt); }
.section-dark {
  background: linear-gradient(180deg, var(--color-dark) 0%, #16202d 100%);
  color: rgba(255, 255, 255, 0.78);
}
.section-dark h2,
.section-dark h3 { color: #fff; }
.section-dark a { color: var(--color-accent-2); }
.section-dark a:hover { color: #fff; }

.section-eyebrow {
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-accent);
  font-weight: 600;
  margin-bottom: 0.85rem;
}
.eyebrow-light { color: var(--color-accent-2); }
.section-head {
  max-width: 680px;
  margin: 0 auto 3.5rem;
  text-align: center;
}
.section-head h2 { margin-bottom: 0.8rem; }
.section-sub {
  color: var(--color-muted);
  font-size: 1.05rem;
  line-height: 1.65;
}

.two-col {
  display: grid;
  grid-template-columns: minmax(200px, 1fr) minmax(0, 2.2fr);
  gap: clamp(2.5rem, 6vw, 5rem);
  align-items: start;
}
.col-narrow h2 { margin-top: 0; }
.col-narrow .section-eyebrow { margin-bottom: 1rem; }

.bio-text p {
  font-size: 1.1rem;
  line-height: 1.75;
  color: var(--color-text-soft);
  margin-bottom: 1.4rem;
  max-width: 64ch;
}
.bio-text p:last-child { margin-bottom: 0; }
.bio-text p:first-of-type::first-letter {
  font-family: var(--serif);
  font-size: 3.8rem;
  font-weight: 400;
  float: left;
  line-height: 0.9;
  padding: 0.4rem 0.65rem 0 0;
  color: var(--color-accent);
  font-style: normal;
}

/* Cards */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: 1rem;
}
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 1.8rem 1.75rem 1.65rem;
  transition: transform .35s var(--ease), box-shadow .35s var(--ease), border-color .25s var(--ease);
  position: relative;
}
.card::before {
  content: "";
  position: absolute;
  top: 0; left: 1.75rem;
  width: 28px; height: 2px;
  background: var(--color-accent);
  border-radius: 2px;
}
.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-line-strong);
}
.card h3 {
  margin-top: .9rem;
  margin-bottom: .6rem;
  color: var(--color-text);
  font-family: var(--serif);
  font-size: 1.2rem;
  font-weight: 500;
}
.card p {
  color: var(--color-muted);
  margin-bottom: 0;
  font-size: 0.95rem;
  line-height: 1.65;
}

/* Experience + Education */
.exp-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2.5rem, 5vw, 4.5rem);
  align-items: start;
}
.exp-col-title {
  font-size: 0.72rem;
  font-family: var(--sans);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--color-muted);
  margin: 0 0 1.5rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--color-line-strong);
}
.exp-skills-title { margin-top: 2.5rem; }
.exp-list { display: grid; gap: 1rem; }
.exp-list li {
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 1.4rem 1.6rem;
  transition: border-color .25s var(--ease), box-shadow .25s var(--ease), transform .25s var(--ease);
}
.exp-list li:hover {
  border-color: var(--color-line-strong);
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
}
.exp-meta {
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent);
  font-weight: 600;
  margin-bottom: 0.6rem;
}
.exp-list h4 {
  font-family: var(--serif);
  font-size: 1.18rem;
  text-transform: none;
  letter-spacing: -0.015em;
  font-weight: 500;
  margin: 0 0 0.25rem;
  color: var(--color-text);
}
.exp-org {
  font-size: 0.92rem;
  color: var(--color-text-soft);
  font-weight: 500;
  margin: 0 0 .7rem;
  letter-spacing: -0.005em;
}
.exp-list p:last-child {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--color-muted);
}
.skills-row { display: grid; gap: 0.6rem; }
.skills-row > div {
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  padding: 0.9rem 1.15rem;
  font-size: 0.92rem;
  color: var(--color-text-soft);
}
.skill-label {
  display: inline-block;
  font-size: 0.65rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent);
  font-weight: 600;
  margin-right: 0.65rem;
}

/* Timeline */
.timeline {
  max-width: 760px;
  margin: 0 auto;
  position: relative;
  padding-left: 2rem;
  border-left: 1px solid var(--color-line-strong);
}
.timeline li {
  position: relative;
  padding: 0 0 2rem 1.5rem;
  display: grid;
  grid-template-columns: 70px 1fr;
  gap: 1.5rem;
  align-items: start;
}
.timeline li:last-child { padding-bottom: 0; }
.timeline li::before {
  content: "";
  position: absolute;
  left: -2.4rem;
  top: 0.5rem;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--color-bg);
  border: 2px solid var(--color-accent);
  box-sizing: border-box;
}
.timeline .year {
  font-family: var(--serif);
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--color-accent);
  letter-spacing: -0.02em;
}
.timeline h3 {
  margin-bottom: 0.25rem;
  font-size: 1.1rem;
  font-weight: 500;
}
.timeline p {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Publications list (home + page) */
.pub-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.pub-list-featured {
  max-width: 820px;
  margin: 0 auto;
}
.pub-list-featured li {
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--color-line);
}
.pub-list-featured li:last-child { border-bottom: 0; }
.pub-title {
  font-family: var(--serif);
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--color-text);
  margin: 0 0 0.35rem;
  line-height: 1.35;
  letter-spacing: -0.015em;
}
.pub-title a {
  color: inherit;
  background-image: linear-gradient(var(--color-accent), var(--color-accent));
  background-size: 0% 1px;
  background-repeat: no-repeat;
  background-position: 0 100%;
  transition: background-size .3s var(--ease), color .2s var(--ease);
}
.pub-title a:hover {
  color: var(--color-accent);
  background-size: 100% 1px;
}
.pub-authors {
  color: var(--color-text-soft);
  font-size: 0.92rem;
  margin: 0 0 0.2rem;
}
.pub-venue {
  color: var(--color-muted);
  font-size: 0.9rem;
  margin: 0;
}
.pub-venue em {
  color: var(--color-text-soft);
  font-weight: 500;
  font-style: italic;
}
.pub-cites {
  display: inline-block;
  margin: .55rem 0 0;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  font-weight: 600;
  padding: 0.2rem 0.6rem;
  border: 1px solid var(--color-accent-soft);
  border-radius: 999px;
  background: var(--color-accent-tint);
}
.cta-line { text-align: center; margin-top: 3rem; }

/* Contact */
.contact-lede {
  font-family: var(--serif);
  font-size: 1.2rem;
  line-height: 1.55;
  color: rgba(255,255,255,0.88);
  max-width: 38ch;
  margin-bottom: 2.5rem;
  font-style: italic;
  letter-spacing: -0.01em;
}
.contact-list {
  display: grid;
  gap: 1.1rem;
}
.contact-list li {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 1.5rem;
  align-items: baseline;
  padding-bottom: 1.1rem;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.contact-list li:last-child { border-bottom: 0; padding-bottom: 0; }
.contact-label {
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent-2);
  font-weight: 600;
}

/* ---------------- Page hero (sub pages) ---------------- */
.page-hero {
  padding: clamp(3.5rem, 7vw, 6rem) 0 3rem;
  border-bottom: 1px solid var(--color-line);
  position: relative;
  overflow: hidden;
}
.page-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 70% 60% at 90% 20%, rgba(160, 125, 60, 0.06), transparent 60%);
  pointer-events: none;
}
.page-hero h1 { margin-bottom: 1.2rem; }
.page-lede {
  max-width: 60ch;
  font-size: 1.15rem;
  color: var(--color-muted);
  line-height: 1.65;
}

/* Metric row */
.metric-row {
  display: flex;
  flex-wrap: wrap;
  gap: 3rem;
  margin-top: 2.75rem;
  align-items: baseline;
}
.metric { display: flex; flex-direction: column; }
.metric-num {
  font-family: var(--serif);
  font-size: 2.6rem;
  font-weight: 400;
  color: var(--color-text);
  line-height: 1;
  letter-spacing: -0.03em;
}
.metric-label {
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-muted);
  margin-top: 0.45rem;
  font-weight: 600;
}
.metric-link {
  font-size: 0.92rem;
  font-weight: 500;
  align-self: end;
  color: var(--color-accent);
}
.metric-link:hover { color: var(--color-dark); }

/* Filter chips */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 3rem;
  padding-bottom: 1.75rem;
  border-bottom: 1px solid var(--color-line);
}
.chip {
  padding: 0.5rem 1.1rem;
  font-size: 0.82rem;
  font-weight: 500;
  font-family: var(--sans);
  border: 1px solid var(--color-line-strong);
  background: var(--color-surface);
  color: var(--color-text);
  border-radius: 999px;
  cursor: pointer;
  transition: all .2s var(--ease);
  letter-spacing: -0.005em;
}
.chip:hover {
  border-color: var(--color-dark);
  color: var(--color-dark);
}
.chip.active {
  background: var(--color-dark);
  color: #fff;
  border-color: var(--color-dark);
}

/* Full pub list */
.pub-item {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 1.4rem;
  padding: 1.75rem 0;
  border-bottom: 1px solid var(--color-line);
  align-items: start;
  transition: opacity .3s var(--ease);
}
.pub-item:last-child { border-bottom: 0; }
.pub-item.hidden { display: none; }
.pub-num {
  font-family: var(--serif);
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--color-accent);
  line-height: 1.15;
  letter-spacing: -0.02em;
}
.footnote {
  margin-top: 2.5rem;
  font-size: 0.85rem;
  color: var(--color-muted);
  font-style: italic;
}

/* ---------------- Footer ---------------- */
.site-footer {
  background: var(--color-dark);
  color: rgba(255,255,255,0.62);
  padding: 2.25rem 0;
  font-size: 0.85rem;
}
.footer-grid {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}
.site-footer p { margin: 0; }
.footer-meta { color: rgba(255,255,255,0.48); }

/* ---------------- Responsive ---------------- */
@media (max-width: 960px) {
  .exp-grid { grid-template-columns: 1fr; }
}
@media (max-width: 880px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: left;
  }
  .hero-card {
    max-width: 360px;
    margin: 0 auto;
  }
  .two-col {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  .contact-list li { grid-template-columns: 1fr; gap: 0.25rem; }
  .hero-meta li { grid-template-columns: 100px 1fr; }
}

@media (max-width: 720px) {
  body { font-size: 16px; }
  .nav-toggle { display: block; }
  .nav-menu {
    position: absolute;
    top: 68px;
    left: 0; right: 0;
    background: var(--color-bg);
    flex-direction: column;
    align-items: flex-start;
    padding: 1.75rem var(--gutter);
    gap: 1.1rem;
    border-bottom: 1px solid var(--color-line);
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    transition: all .25s var(--ease);
  }
  .nav-menu.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  .timeline li { grid-template-columns: 56px 1fr; gap: 1rem; }
  .timeline .year { font-size: 1.25rem; }
  .metric-row { gap: 1.75rem; }
  .metric-num { font-size: 2rem; }
  .hero h1 { font-size: 2.6rem; }
  .pub-list-featured li { padding: 1.25rem 0; }
}

@media (max-width: 480px) {
  :root { --gutter: 1.25rem; }
  .brand-text { display: none; }
  .hero { padding-top: 2.5rem; }
  .portrait { width: 160px; height: 160px; }
  .portrait-monogram { font-size: 3.6rem; }
  .pub-item {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }
  .pub-num { font-size: 1rem; color: var(--color-muted); }
  .hero-card { padding: 1.75rem 1.5rem; }
  .quick-stats dd { font-size: 1.5rem; }
}