/* ==========================================================================
   Ayrin Lie — site stylesheet
   Design language: "flight log" — technical paper, hairline rules, mono
   data labels, amber "signal" accent, teal secondary accent.
   ========================================================================== */

:root{
  /* Color tokens */
  --paper:        #EFF1EA;
  --paper-raised: #E5E8DF;
  --card:         #FAFAF6;
  --ink:          #161B2E;
  --ink-soft:     #5A6170;
  --ink-faint:    #8A8F84;
  --line:         #D1D5C8;
  --line-strong:  #B7BCAC;
  --amber:        #D9722A;
  --amber-dark:   #B4591C;
  --amber-soft:   #F3D9BD;
  --teal:         #2E6F68;
  --teal-soft:    #D8E6E1;

  /* Type */
  --font-display: 'Space Grotesk', 'Helvetica Neue', Arial, sans-serif;
  --font-body:    'IBM Plex Sans', -apple-system, sans-serif;
  --font-mono:    'IBM Plex Mono', 'Courier New', monospace;

  --max-w: 980px;
  --pad: clamp(20px, 5vw, 48px);
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior: auto; }
}

body{
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16.5px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img{ max-width: 100%; display: block; }

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

h1, h2, h3, h4{
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0 0 0.4em;
}

p{ margin: 0 0 1em; }

.wrap{
  max-width: var(--max-w);
  margin: 0 auto;
  padding-left: var(--pad);
  padding-right: var(--pad);
}

.eyebrow{
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--amber-dark);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 0.9em;
}
.eyebrow::before{
  content: '';
  width: 7px; height: 7px;
  background: var(--amber);
  display: inline-block;
  border-radius: 1px;
  transform: rotate(45deg);
}
.eyebrow.muted{ color: var(--ink-faint); }
.eyebrow.muted::before{ background: var(--ink-faint); }

hr.rule{
  border: none;
  border-top: 1px solid var(--line);
  margin: 2.6em 0;
}

/* ---------- header / nav ---------------------------------------------- */

.site-header{
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(239, 241, 234, 0.92);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}
.site-header .wrap{
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 18px;
  padding-bottom: 18px;
  gap: 20px;
  flex-wrap: wrap;
}
.brand{
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.01em;
  white-space: nowrap;
}
.brand .brand-dot{ color: var(--amber); }

.site-nav{
  display: flex;
  gap: clamp(14px, 3vw, 28px);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  flex-wrap: wrap;
}
.site-nav a{
  position: relative;
  padding-bottom: 4px;
  color: var(--ink-soft);
  transition: color 150ms ease;
}
.site-nav a:hover{ color: var(--ink); }
.site-nav a.active{ color: var(--ink); }
.site-nav a.active::after{
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 2px;
  background: var(--amber);
}

/* ---------- footer ------------------------------------------------------ */

.site-footer{
  border-top: 1px solid var(--line);
  margin-top: 5em;
  padding: 34px 0 46px;
}
.site-footer .wrap{
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}
.footer-links{
  display: flex;
  gap: 22px;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.footer-links a{ color: var(--ink-soft); border-bottom: 1px solid transparent; }
.footer-links a:hover{ color: var(--amber-dark); border-bottom-color: var(--amber); }
.footer-note{
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--ink-faint);
  letter-spacing: 0.04em;
}

/* ---------- buttons / links --------------------------------------------- */

.btn-row{ display: flex; flex-wrap: wrap; gap: 12px; margin-top: 1.8em; }
.btn{
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border: 1px solid var(--ink);
  padding: 11px 18px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--card);
  transition: transform 150ms ease, box-shadow 150ms ease, background 150ms ease;
}
.btn:hover{
  background: var(--ink);
  color: var(--paper);
  transform: translate(-2px, -2px);
  box-shadow: 3px 3px 0 var(--amber);
}

/* ---------- page header block (used on inner pages) --------------------- */

.page-head{ padding: 64px 0 18px; }
.page-head h1{ font-size: clamp(2rem, 4vw, 2.7rem); }
.page-head .dek{
  color: var(--ink-soft);
  font-size: 1.05rem;
  max-width: 620px;
}

main{ padding-bottom: 40px; }

/* ==========================================================================
   HOME
   ========================================================================== */

.hero{ padding: 70px 0 30px; }
.hero h1{
  font-size: clamp(2.3rem, 5.5vw, 3.4rem);
  margin-bottom: 0.25em;
}
.hero .role{
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--ink-soft);
  letter-spacing: 0.04em;
  margin-bottom: 1.6em;
}
.hero .lead{
  font-size: 1.12rem;
  max-width: 620px;
}
.hero .lead.soft{ color: var(--ink-soft); max-width: 600px; }

.hero-body{
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
  margin-top: 1.8em;
  align-items: start;
}
@media (min-width: 760px){
  .hero-body{ grid-template-columns: 1fr 250px; gap: 52px; }
}
.hero-text .lead:first-child{ margin-top: 0; }

.hero-photo{ margin: 0; max-width: 250px; }
@media (max-width: 759px){
  .hero-photo{ order: -1; }
}
.hero-photo .frame {
  display: block;
  width: 200px;        
  aspect-ratio: 1 / 1; 
  border-radius: 50%;  
  overflow: hidden;    
}

.hero-photo .frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;   

}
.hero-photo figcaption{
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-top: 8px;
}

/* mini static route strip */
.mini-route{
  margin: 2.6em 0 1.8em;
  display: flex;
  align-items: center;
  gap: 14px;
  max-width: 640px;
}
.mini-route .stop{ flex-shrink: 0; text-align: center; }
.mini-route .stop .dot{
  width: 9px; height: 9px;
  border: 2px solid var(--ink);
  border-radius: 50%;
  background: var(--card);
  margin: 0 auto 6px;
}
.mini-route .stop.end .dot{ background: var(--amber); border-color: var(--amber-dark); }
.mini-route .stop .label{
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-soft);
  white-space: nowrap;
}
.mini-route .track{
  flex: 1;
  position: relative;
  height: 1px;
  background-image: repeating-linear-gradient(to right, var(--line-strong) 0 6px, transparent 6px 12px);
}
.mini-route .track::after{
  content: '';
  position: absolute;
  right: -1px; top: 50%;
  width: 0; height: 0;
  transform: translateY(-50%);
  border-style: solid;
  border-width: 5px 0 5px 7px;
  border-color: transparent transparent transparent var(--amber);
}

/* ==========================================================================
   WORK
   ========================================================================== */

.work-entry{
  border: 1px solid var(--line);
  background: var(--card);
  padding: 30px clamp(20px, 4vw, 38px);
  margin-bottom: 28px;
}
.work-entry .meta{
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 0.6em;
}
.work-entry h2{ font-size: 1.45rem; margin-bottom: 0.15em; }
.work-entry .org{
  color: var(--teal);
  font-weight: 500;
  margin-bottom: 0.9em;
  font-size: 0.95rem;
}
.tag-row{ display: flex; flex-wrap: wrap; gap: 8px; margin-top: 1.2em; }
.tag{
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border: 1px solid var(--line-strong);
  color: var(--ink-soft);
  padding: 5px 10px;
  background: var(--paper);
}
.more-soon{
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--ink-faint);
  letter-spacing: 0.03em;
  padding-left: 2px;
}

/* ==========================================================================
   PROJECTS
   ========================================================================== */

.project-card{
  border: 1px solid var(--line);
  background: var(--card);
  margin-bottom: 30px;
  transition: box-shadow 200ms ease, transform 200ms ease;
}
.project-card:hover{ box-shadow: 4px 4px 0 var(--line-strong); }

.project-head{
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}
@media (min-width: 760px){
  .project-head{ grid-template-columns: 1.3fr 1fr; }
}
.project-head-text{
  padding: 30px clamp(20px, 4vw, 38px);
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.project-meta{
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 0.7em;
}
.project-head-text h2{ font-size: 1.5rem; margin-bottom: 0.3em; }
.project-supervisor{
  color: var(--teal);
  font-size: 0.92rem;
  font-weight: 500;
  margin-bottom: 0.8em;
}
.project-teaser{ color: var(--ink-soft); margin-bottom: 0; }

.project-thumb{
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--paper-raised);
}
.project-thumb img{
  width: 100%; height: 100%;
  object-fit: cover;
  display: block;
}
.project-thumb .thumb-cap{
  position: absolute;
  left: 0; bottom: 0; right: 0;
  background: rgba(22,27,46,0.78);
  color: #EFF1EA;
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.04em;
  padding: 6px 10px;
}

.project-toggle-row{
  border-top: 1px solid var(--line);
  display: flex;
}
.project-toggle{
  width: 100%;
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink);
  padding: 14px clamp(20px, 4vw, 38px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  transition: background 150ms ease;
}
.project-toggle:hover{ background: var(--paper-raised); }
.project-toggle .plus{
  width: 16px; height: 16px;
  position: relative;
  flex-shrink: 0;
}
.project-toggle .plus::before,
.project-toggle .plus::after{
  content: '';
  position: absolute;
  background: var(--amber-dark);
  transition: transform 250ms ease;
}
.project-toggle .plus::before{ left: 0; top: 7px; width: 16px; height: 2px; }
.project-toggle .plus::after{ left: 7px; top: 0; width: 2px; height: 16px; }
.project-card.open .project-toggle .plus::after{ transform: rotate(90deg); }

.details-wrap{
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 420ms cubic-bezier(.4,0,.2,1);
}
.project-card.open .details-wrap{ grid-template-rows: 1fr; }
.details-inner{ overflow: hidden; }
.details-content{
  padding: 8px clamp(20px, 4vw, 38px) 36px;
  border-top: 1px solid var(--line);
}

.detail-block{ margin-bottom: 1.8em; }
.detail-block h3{
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
  font-weight: 600;
  margin-bottom: 0.7em;
}
.detail-block ul{ margin: 0; padding-left: 1.2em; }
.detail-block li{ margin-bottom: 0.5em; }

.callout{
  border-left: 3px solid var(--amber);
  background: var(--amber-soft);
  padding: 14px 18px;
  font-style: italic;
  color: var(--ink);
  margin-bottom: 1.8em;
}

.status-note{
  border: 1px dashed var(--line-strong);
  color: var(--ink-soft);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 12px 16px;
  margin-bottom: 1.8em;
}

.data-table{
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  margin-bottom: 0.6em;
}
.data-table caption{
  text-align: left;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--ink-faint);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 0.6em;
}
.data-table th, .data-table td{
  border: 1px solid var(--line);
  padding: 8px 10px;
  text-align: left;
}
.data-table th{
  background: var(--paper-raised);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.data-table tr.highlight td{ background: var(--teal-soft); }

.compare-grid{
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-bottom: 0.4em;
}
@media (min-width: 600px){
  .compare-grid{ grid-template-columns: 1fr 1fr; }
}
.compare-item figure{ margin: 0; }
.compare-item img{ width: 100%; aspect-ratio: 4/3; object-fit: cover; border: 1px solid var(--line); }
.compare-item figcaption{
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  margin-top: 6px;
}
.compare-item figcaption strong{ color: var(--ink); }
.compare-grid.single{ grid-template-columns: 1fr; max-width: 360px; }

.gallery-grid{
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}
@media (min-width: 600px){
  .gallery-grid{ grid-template-columns: repeat(3, 1fr); }
}
.gallery-grid figure{ margin: 0; }
.gallery-grid img{ width: 100%; aspect-ratio: 1/1; object-fit: cover; border: 1px solid var(--line); }
.gallery-grid figcaption{
  font-family: var(--font-mono);
  font-size: 0.64rem;
  color: var(--ink-soft);
  margin-top: 5px;
  line-height: 1.3;
}

/* ==========================================================================
   BIOGRAPHY — scroll-linked flight map
   ========================================================================== */

.bio-intro{ padding: 64px 0 10px; }
.bio-hint{
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--ink-faint);
  letter-spacing: 0.04em;
}

.bio-flightmap{
  position: relative;
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 6px;
  align-items: start;
}
@media (min-width: 700px){
  .bio-flightmap{ grid-template-columns: 84px 1fr; gap: 18px; }
}

.flightpath-rail{
  position: relative;
  height: 100%;
  min-height: 100%;
}
.flightpath-svg{
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  overflow: visible;
}
.flightpath-bg{
  fill: none;
  stroke: var(--line-strong);
  stroke-width: 2;
  stroke-dasharray: 1 7;
  stroke-linecap: round;
}
.flightpath-flown{
  fill: none;
  stroke: var(--amber);
  stroke-width: 2;
  stroke-linecap: round;
}

.flightplane{
  position: absolute;
  top: 0; left: 0;
  width: 30px;
  transform-origin: 15px 9px;
  filter: drop-shadow(1px 2px 1px rgba(22,27,46,0.25));
  z-index: 5;
  transition: transform 100ms linear;
}
.plane-glyph{
  fill: var(--amber);
  stroke: var(--ink);
  stroke-width: 1;
}
@media (prefers-reduced-motion: reduce){
  .flightplane{ transition: none; }
}

.waypoint-marker{
  position: absolute;
  top: 0; left: 0;
  transform: translate(-50%, -50%);
  z-index: 4;
}
.waypoint-marker .wp-dot{
  display: block;
  width: 11px; height: 11px;
  background: var(--card);
  border: 2px solid var(--ink);
  border-radius: 50%;
}
.waypoint-marker.is-passed .wp-dot{
  background: var(--amber);
  border-color: var(--amber-dark);
}

.bio-content{ min-width: 0; }

.bio-endpoint{
  padding: 6px 0 30px;
}
.bio-endpoint .eyebrow{ margin-bottom: 0.4em; }
.bio-endpoint p{ color: var(--ink-soft); max-width: 560px; }
.bio-endpoint h2{ font-size: 1.1rem; font-family: var(--font-mono); letter-spacing: 0.02em; text-transform: none; }

.bio-chapter{
  padding: 10px 0 46px;
  max-width: 640px;
}
.bio-chapter .eyebrow{ margin-bottom: 0.5em; }
.bio-chapter h2{
  font-size: clamp(1.5rem, 3vw, 1.9rem);
  margin-bottom: 0.65em;
}
.bio-chapter p{ color: var(--ink); }
.bio-chapter p + p{ margin-top: 1em; }

/* ==========================================================================
   misc
   ========================================================================== */

.skip-link{
  position: absolute;
  left: -9999px;
}
.skip-link:focus{
  left: 8px; top: 8px;
  background: var(--ink);
  color: var(--paper);
  padding: 8px 14px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  z-index: 100;
}

a:focus-visible, button:focus-visible{
  outline: 2px solid var(--amber-dark);
  outline-offset: 2px;
}