/* =============================================================
   Concept 03 · Restrained modern
   Source Serif 4 body / display + Geist sans micro-type.
   Cream paper, ink, single slate-blue accent.
   ============================================================= */

:root {
  --bg:        #FAF9F6;
  --bg-2:      #F4F2EC;
  --surface:   #FFFFFF;
  --ink:       #1B1C1E;
  --ink-soft:  #3F4146;
  --ink-mute:  #75787E;
  --ink-dim:   #9A9CA0;
  --line:      #E4E2DC;
  --line-soft: #ECEAE3;
  --accent:    #355176;
  --accent-hi: #4A6C95;
  --accent-bg: #EDF0F5;
  --maxw:      1080px;
  --pad:       28px;

  --serif:     'Source Serif 4', Charter, 'Source Serif Pro', Georgia, 'Times New Roman', serif;
  --sans:      'Geist', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--ink); }
body {
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: 'kern', 'liga';
}

/* ---- Skip link ---- */
.skip {
  position: absolute;
  left: -9999px;
  top: 0;
}
.skip:focus {
  left: 12px; top: 12px;
  background: var(--ink);
  color: var(--bg);
  padding: 8px 12px;
  font-family: var(--sans);
  font-size: 13px;
  text-decoration: none;
  z-index: 100;
}

/* ---- Links ---- */
a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid color-mix(in oklch, var(--accent) 35%, transparent);
  padding-bottom: 1px;
  transition: color 0.12s, border-color 0.12s;
}
a:hover { color: var(--accent-hi); border-bottom-color: var(--accent-hi); }
a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---- Kicker / micro-type ---- */
.kicker {
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-mute);
  font-weight: 500;
}
.kicker--inline {
  display: inline;
  margin-right: 6px;
  color: var(--accent);
}

/* ---- Figures (numbers) ---- */
.fig {
  font-feature-settings: 'tnum', 'lnum';
  font-variant-numeric: tabular-nums lining-nums;
  color: var(--ink);
  font-weight: 600;
}

/* ---- Nav ---- */
.nav {
  position: sticky; top: 0;
  background: rgba(250,249,246,0.92);
  backdrop-filter: saturate(140%) blur(10px);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--line);
  z-index: 20;
}
.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px var(--pad);
  gap: 24px;
}
.nav__brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  border-bottom: 0;
  font-family: var(--serif);
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.005em;
  flex-shrink: 0;
}
.nav__brand-mark {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  display: inline-block;
}
.nav__list {
  list-style: none;
  display: flex;
  gap: 24px;
  margin: 0;
  padding: 0;
  font-family: var(--sans);
  font-size: 13px;
  letter-spacing: 0;
  overflow-x: auto;
  scrollbar-width: none;
}
.nav__list::-webkit-scrollbar { display: none; }
.nav__list a {
  color: var(--ink-soft);
  border-bottom: 0;
  padding-bottom: 0;
  white-space: nowrap;
}
.nav__list a:hover { color: var(--ink); }

main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--pad);
}

/* ---- Intro ---- */
.intro {
  padding: 80px 0 72px;
  position: relative;
}
.intro .kicker {
  margin: 0 0 22px;
  display: inline-flex;
  align-items: center;
  gap: 16px;
}
.intro .kicker::before {
  content: "";
  width: 36px;
  height: 2px;
  background: var(--accent);
  flex-shrink: 0;
}
.intro h1 {
  margin: 0 0 28px;
  font-family: var(--serif);
  font-size: clamp(32px, 4.6vw, 52px);
  line-height: 1.12;
  font-weight: 500;
  letter-spacing: -0.015em;
  max-width: 22ch;
  text-wrap: balance;
  color: var(--ink);
}
.intro__sub {
  margin: 0 0 36px;
  color: var(--ink-soft);
  max-width: 60ch;
  font-size: 19px;
  line-height: 1.55;
}

/* meta row */
.intro__meta {
  list-style: none;
  margin: 0 0 36px;
  padding: 20px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.intro__meta li {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.intro__meta-k {
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-mute);
  font-weight: 500;
}
.intro__meta-v {
  font-family: var(--serif);
  font-size: 15px;
  color: var(--ink);
}

.intro__cta {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin: 0;
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 11px 18px;
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--line);
  font-family: var(--sans);
  font-size: 13.5px;
  font-weight: 500;
  letter-spacing: 0.005em;
  white-space: nowrap;
  border-bottom: 1px solid var(--line);
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.btn:hover { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.btn--primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.btn--primary:hover { background: var(--accent-hi); border-color: var(--accent-hi); color: #fff; }

/* ---- Sections ---- */
.section {
  position: relative;
  padding: 80px 0;
}
.section::before {
  /* keep visual rhythm w/o doubled borders */
  content: "";
  position: absolute;
  left: 0; right: 0;
  top: 0;
  height: 1px;
  background: var(--line);
}
.section--cream { background: var(--bg); }
.section--surface {
  background: var(--bg-2);
  margin-left: calc(50% - 50vw);
  margin-right: calc(50% - 50vw);
  padding-left: calc(50vw - 50%);
  padding-right: calc(50vw - 50%);
}
.section--surface > .section-head,
.section--surface > .work-list,
.section--surface > .cert-grid {
  max-width: var(--maxw);
  margin-left: auto;
  margin-right: auto;
}

/* Section head: serif title + sans kicker + note */
.section-head {
  display: grid;
  grid-template-columns: 64px 1fr;
  grid-template-rows: auto auto;
  column-gap: 24px;
  row-gap: 12px;
  align-items: baseline;
  margin: 0 0 48px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line);
}
.section-head__no {
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin: 0;
  grid-row: 1;
  grid-column: 1;
  font-feature-settings: 'tnum';
  font-weight: 500;
  padding-top: 8px;
}
.section-head__title {
  font-family: var(--serif);
  font-size: clamp(28px, 3.6vw, 40px);
  font-weight: 500;
  line-height: 1.05;
  letter-spacing: -0.018em;
  margin: 0;
  color: var(--ink);
  grid-row: 1;
  grid-column: 2;
}
.section-head__note {
  margin: 0;
  grid-row: 2;
  grid-column: 2;
  font-family: var(--serif);
  font-size: 15.5px;
  color: var(--ink-mute);
  max-width: 56ch;
  font-style: italic;
}

/* ---- Timeline (Experience) ---- */
.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}
.role {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 40px;
  padding: 28px 0;
  border-top: 1px solid var(--line);
  transition: background 0.15s;
}
.role:first-child { border-top: 0; padding-top: 0; }
.role:hover { background: rgba(53,81,118,0.018); }
.role__when { padding-top: 4px; }
.role__date {
  margin: 0 0 6px;
  font-family: var(--sans);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
  font-weight: 500;
}
.role__org {
  margin: 0;
  font-family: var(--sans);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-mute);
  line-height: 1.4;
  font-weight: 500;
}
.role__title {
  margin: 0 0 10px;
  font-family: var(--serif);
  font-size: 21px;
  line-height: 1.25;
  font-weight: 600;
  letter-spacing: -0.012em;
  color: var(--ink);
}
.role__lede {
  margin: 0 0 12px;
  color: var(--ink-soft);
  max-width: 64ch;
  font-size: 17px;
}
.role__body ul {
  margin: 8px 0 0;
  padding-left: 20px;
}
.role__body ul li {
  margin: 0 0 6px;
  color: var(--ink-soft);
  font-size: 16px;
  line-height: 1.55;
  max-width: 68ch;
}
.role__body ul li::marker { color: var(--ink-dim); }
.role__body strong { color: var(--ink); font-weight: 600; }

/* ---- Projects ---- */
.work-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
  counter-reset: work;
}
.work-item {
  position: relative;
  padding: 32px 32px 28px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--surface);
  counter-increment: work;
  display: flex;
  flex-direction: column;
  gap: 0;
  transition: background 0.15s;
}
.work-item:hover { background: var(--bg-2); }
.work-item::before {
  content: counter(work, decimal-leading-zero);
  display: block;
  font-family: var(--serif);
  font-size: 28px;
  line-height: 1;
  color: var(--accent);
  font-style: italic;
  font-weight: 400;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}
.work-item__tag {
  margin: 0 0 10px;
  font-family: var(--sans);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-mute);
  font-weight: 500;
}
.work-item__title {
  margin: 0 0 12px;
  font-family: var(--serif);
  font-size: 21px;
  line-height: 1.22;
  font-weight: 600;
  letter-spacing: -0.012em;
  color: var(--ink);
}
.work-item p:not(.work-item__tag):not(.work-item__link) {
  margin: 0;
  flex: 1;
  color: var(--ink-soft);
  font-size: 16px;
  line-height: 1.55;
}
.work-item__link {
  margin: 18px 0 0;
  font-family: var(--sans);
  font-size: 13px;
  letter-spacing: 0.02em;
}
.work-item__link a {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ---- Education ---- */
.edu-feature {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 24px;
  padding: 24px 28px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  margin: 0 0 32px;
  align-items: center;
}
.edu-feature__badge {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 500;
  font-size: 36px;
  color: var(--accent);
  line-height: 1;
  letter-spacing: -0.02em;
  padding: 4px 14px 6px;
  border: 1px solid var(--accent);
  background: var(--accent-bg);
}
.edu-feature__title {
  margin: 0 0 4px;
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.012em;
  color: var(--ink);
  line-height: 1.2;
}
.edu-feature__org {
  margin: 0 0 4px;
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-mute);
  font-weight: 500;
}
.edu-feature__detail {
  margin: 0;
  font-size: 14.5px;
  color: var(--ink-soft);
}
.edu-feature__detail a { font-size: 14.5px; }

.edu-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}
.edu-grid li {
  padding: 20px 22px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}
.edu-grid h4 {
  margin: 0 0 6px;
  font-family: var(--serif);
  font-size: 16px;
  line-height: 1.3;
  font-weight: 600;
  letter-spacing: -0.005em;
}
.edu-grid p {
  margin: 0;
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-mute);
  line-height: 1.4;
}

.edu-note {
  margin: 24px 0 0;
  font-family: var(--serif);
  font-size: 15px;
  color: var(--ink-soft);
}

/* ---- Certifications ---- */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}
.cert-group {
  padding: 24px 26px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}
.cert-group__h {
  margin: 0 0 14px;
  font-family: var(--sans);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 500;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-soft);
}
.cert-group ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
.cert-group li {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 9px 0;
  border-bottom: 1px dotted var(--line-soft);
}
.cert-group li:last-child { border-bottom: 0; }
.cert-group li span {
  font-family: var(--serif);
  font-size: 15px;
  color: var(--ink);
  line-height: 1.3;
}
.cert-group li span a {
  color: var(--ink);
  border-bottom: 1px solid var(--line-soft);
  padding-bottom: 1px;
}
.cert-group li span a::after {
  content: " \2197";
  font-family: var(--sans);
  font-size: 11px;
  color: var(--ink-dim);
  margin-left: 4px;
  letter-spacing: 0;
  transition: color 0.15s, transform 0.15s;
  display: inline-block;
}
.cert-group li span a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}
.cert-group li span a:hover::after {
  color: var(--accent);
  transform: translate(2px, -2px);
}
.cert-group li em {
  font-family: var(--sans);
  font-style: normal;
  color: var(--ink-mute);
  font-size: 11.5px;
  letter-spacing: 0.04em;
}

/* ---- Contact ---- */
.contact-cta {
  margin: 0 0 28px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}
.contact-cta__note {
  font-family: var(--serif);
  font-style: italic;
  font-size: 15px;
  color: var(--ink-mute);
}
.contact-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.contact-list li {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 24px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
  align-items: baseline;
  transition: padding 0.18s;
}
.contact-list li:first-child { border-top: 1px solid var(--line); }
.contact-list li:hover { padding-left: 10px; }
.contact-list__k {
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-mute);
  font-weight: 500;
}
.contact-list li a {
  font-family: var(--serif);
  font-size: 19px;
  color: var(--ink);
  border-bottom: 0;
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
}
.contact-list li a:hover { color: var(--accent); }
.contact-list li a .arrow {
  font-family: var(--sans);
  font-size: 15px;
  color: var(--ink-dim);
  transition: color 0.15s, transform 0.15s;
}
.contact-list li a:hover .arrow { color: var(--accent); transform: translate(3px, -2px); }

/* ---- Foot ---- */
.foot {
  padding: 36px 0 64px;
  color: var(--ink-mute);
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 24px;
}
.foot__line {
  margin: 0;
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.04em;
}
.foot__line--mute { color: var(--ink-dim); }

/* ---- Responsive ---- */
@media (max-width: 880px) {
  .intro__meta { grid-template-columns: repeat(2, 1fr); gap: 18px; }
  .role { grid-template-columns: 1fr; gap: 12px; }
  .role__when { display: flex; gap: 14px; align-items: baseline; padding-top: 0; }
  .work-item { padding: 24px; }
  .work-item::before { font-size: 24px; margin-bottom: 12px; }
  .edu-grid { grid-template-columns: repeat(2, 1fr); }
  .cert-grid { grid-template-columns: 1fr; }
  .section-head { grid-template-columns: 1fr; gap: 6px; }
  .section-head__no { grid-row: 1; grid-column: 1; padding-top: 0; }
  .section-head__title { grid-row: 2; grid-column: 1; }
  .section-head__note { grid-row: 3; grid-column: 1; }
}

@media (max-width: 720px) {
  .work-list { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  .intro { padding: 56px 0 56px; }
  .intro h1 { font-size: 30px; }
  .intro__sub { font-size: 17px; }
  .intro__meta { grid-template-columns: 1fr; }
  .edu-grid { grid-template-columns: 1fr; }
  .edu-feature { grid-template-columns: 1fr; gap: 14px; padding: 20px; }
  .edu-feature__badge { justify-self: start; font-size: 28px; }
  .contact-list li { grid-template-columns: 1fr; gap: 4px; padding: 14px 0; }
  .contact-list li:hover { padding-left: 0; }
  .section { padding: 56px 0; }
  .nav { padding: 12px 18px; }
}