/* =========================================================
   TRYSAIL — Physics Research Group
   Design tokens — quiet, academic, no theatrics
   ========================================================= */
:root{
  --paper:      #FAF8F3;
  --paper-2:    #F1EEE5;
  --paper-3:    #E9E4D8;
  --ink:        #1E2126;
  --ink-soft:   #52565F;
  --muted:      #83868F;
  --rule:       #DDD7C8;
  --rule-strong:#C7BFA9;

  --accent:      #2F4A5E;  /* primary — deep slate blue */
  --accent-dark: #223644;
  --bronze:      #92703F;  /* used sparingly, e.g. small labels */

  --quantum:    #2E8B84;   /* Parsa — quantum info / gravity */
  --cosmology:  #46538F;   /* Artin — cosmology / math physics */
  --bio:        #5C7A46;   /* Mozhgan — biophysics / complex systems */

  --display: "Newsreader", Georgia, "Times New Roman", serif;
  --body:    "IBM Plex Sans", "Segoe UI", sans-serif;
  --mono:    "IBM Plex Mono", "SFMono-Regular", monospace;

  --maxw: 1080px;
  --edge: clamp(20px, 5vw, 60px);
}

*, *::before, *::after{ box-sizing: border-box; }

html{ background: var(--paper); scroll-behavior: smooth; }

body{
  margin:0;
  background-color: var(--paper);
  background-image: radial-gradient(rgba(30,33,38,0.06) 1px, transparent 1px);
  background-size: 24px 24px;
  color: var(--ink);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a{ color: inherit; text-decoration: none; }
img{ max-width: 100%; display:block; }

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

:focus-visible{
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

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

.eyebrow{
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--bronze);
}

h1,h2,h3{
  font-family: var(--display);
  font-weight: 500;
  color: var(--ink);
  margin: 0;
  letter-spacing: -0.005em;
}

h1{ font-size: clamp(2.3rem, 4.6vw, 3.6rem); font-weight: 500; line-height: 1.08; }
h2{ font-size: clamp(1.5rem, 2.6vw, 2rem); font-weight: 500; line-height: 1.2; }
h3{ font-size: 1.2rem; font-weight: 600; font-family: var(--body); }

p{ color: var(--ink-soft); margin: 0; }
.muted{ color: var(--muted); }

/* =========================================================
   Header / navigation
   ========================================================= */
.site-header{
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(250,248,243,0.92);
  border-bottom: 1px solid var(--rule);
}

.site-header .wrap{
  display:flex;
  align-items:center;
  justify-content: space-between;
  padding-top: 20px;
  padding-bottom: 20px;
}

.brand{
  display:flex;
  flex-direction: column;
  gap: 2px;
  line-height: 1;
}

.brand-mark{
  font-family: var(--display);
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--ink);
}

.brand-sub{
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.nav-links{
  display:flex;
  gap: clamp(16px, 3vw, 32px);
  align-items:center;
  font-family: var(--mono);
  font-size: 0.8rem;
  letter-spacing: 0.03em;
}

.nav-links a{
  position: relative;
  padding: 6px 2px;
  color: var(--ink-soft);
  transition: color 0.2s ease;
}
.nav-links a::after{
  content:"";
  position:absolute;
  left:0; right:100%;
  bottom: 0;
  height: 1px;
  background: var(--accent);
  transition: right 0.25s ease;
}
.nav-links a:hover{ color: var(--ink); }
.nav-links a:hover::after{ right: 0; }
.nav-links a.active{ color: var(--accent); }
.nav-links a.active::after{ right: 0; }

.nav-toggle{
  display:none;
  background:none;
  border: 1px solid var(--rule-strong);
  border-radius: 6px;
  color: var(--ink);
  width: 40px; height: 36px;
  cursor:pointer;
}

@media (max-width: 720px){
  .nav-toggle{ display:block; }
  .nav-links{
    position:absolute;
    top: 100%; left:0; right:0;
    flex-direction: column;
    align-items: flex-start;
    background: var(--paper);
    border-bottom: 1px solid var(--rule);
    padding: 8px var(--edge) 22px;
    gap: 14px;
    display:none;
  }
  .nav-links.open{ display:flex; }
}

.divider{
  border: none;
  border-top: 1px solid var(--rule);
  margin: 0;
}

/* =========================================================
   Hero
   ========================================================= */
.hero{ padding: clamp(48px, 8vw, 92px) 0 clamp(32px, 5vw, 52px); }
.hero .eyebrow{ display:block; margin-bottom: 16px; }
.hero h1{ max-width: 16ch; }
.hero-lede{
  margin-top: 20px;
  max-width: 58ch;
  font-size: 1.08rem;
}

/* =========================================================
   Sections
   ========================================================= */
section{ padding: clamp(40px, 6vw, 72px) 0; }

.section-head{ margin-bottom: 28px; }
.section-head .eyebrow{ margin-bottom: 8px; display:block; }
.section-head p{ margin-top: 8px; max-width: 56ch; }

/* =========================================================
   About / name section (home)
   ========================================================= */
.split{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(28px, 6vw, 64px);
  align-items: start;
}
@media (max-width: 800px){ .split{ grid-template-columns: 1fr; } }

.split p + p{ margin-top: 14px; }

.pull{
  font-family: var(--display);
  font-size: clamp(1.2rem, 2vw, 1.45rem);
  font-style: italic;
  font-weight: 400;
  color: var(--ink);
  line-height: 1.5;
  border-left: 2px solid var(--accent);
  padding-left: 20px;
}

/* simple text-link "explore" row, replaces card grid on the home page */
.explore-list{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
  border-radius: 8px;
  overflow: hidden;
}
@media (max-width: 760px){ .explore-list{ grid-template-columns: 1fr; } }

.explore-item{
  background: var(--paper-2);
  padding: 24px 26px;
  display:flex;
  flex-direction: column;
  gap: 8px;
  transition: background 0.2s ease;
}
.explore-item:hover{ background: var(--paper-3); }
.explore-item .eyebrow{ margin-bottom: 0; }
.explore-item h3{ font-family: var(--display); font-weight: 500; font-size: 1.15rem; }
.explore-item span.arrow{ font-family: var(--mono); font-size: 0.8rem; color: var(--accent); }

/* =========================================================
   Members
   ========================================================= */
.member-list{ display:flex; flex-direction: column; }

.member{
  display:grid;
  grid-template-columns: 128px 1fr;
  gap: clamp(20px, 4vw, 44px);
  padding: 40px 0;
  border-top: 1px solid var(--rule);
  align-items: start;
}
.member:first-child{ border-top: none; padding-top: 8px; }

@media (max-width: 640px){ .member{ grid-template-columns: 1fr; } }

.member-mark{ width: 88px; height: 88px; }

.member-name{
  font-family: var(--display);
  font-size: 1.45rem;
  font-weight: 500;
  color: var(--ink);
  margin: 0 0 6px;
}

.member-role{
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 14px;
  display:block;
}
.member[data-field="quantum"] .member-role{ color: var(--quantum); }
.member[data-field="cosmology"] .member-role{ color: var(--cosmology); }
.member[data-field="bio"] .member-role{ color: var(--bio); }

.member-bio{ max-width: 62ch; font-size: 1rem; }

.member-keywords{ margin-top: 16px; display:flex; flex-wrap: wrap; gap: 8px; }

.chip{
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--ink-soft);
  background: var(--paper-2);
  border: 1px solid var(--rule-strong);
  border-radius: 999px;
  padding: 4px 11px;
}

/* =========================================================
   Research — current projects
   ========================================================= */
.card-grid{
  display:grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
  border-radius: 10px;
  overflow: hidden;
}
@media (max-width: 760px){ .card-grid{ grid-template-columns: 1fr; } }

.card{
  background: var(--paper-2);
  padding: 28px 26px 30px;
  display:flex;
  flex-direction: column;
  gap: 12px;
  transition: background 0.2s ease;
}
.card:hover{ background: var(--paper-3); }

.card p{ font-size: 0.96rem; }

.project-status{
  display:inline-flex;
  align-items:center;
  gap: 7px;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
}
.project-status::before{
  content:"";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

.card-link{
  margin-top: auto;
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--accent);
  display:inline-flex;
  align-items:center;
  gap: 6px;
}
.card-link .arrow{ transition: transform 0.2s ease; }
.card:hover .card-link .arrow{ transform: translateX(3px); }

/* =========================================================
   Contact
   ========================================================= */
.contact-grid{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(28px, 6vw, 64px);
}
@media (max-width: 780px){ .contact-grid{ grid-template-columns: 1fr; } }

.log{
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-radius: 10px;
  padding: 28px 30px;
  font-family: var(--mono);
  font-size: 0.88rem;
}
.log-row{
  display:flex;
  justify-content: space-between;
  gap: 16px;
  padding: 13px 0;
  border-top: 1px solid var(--rule);
}
.log-row:first-child{ border-top: none; }
.log-key{ color: var(--muted); }
.log-val{ color: var(--ink); text-align: right; }
.log-val a:hover{ color: var(--accent); }

.btn{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--paper);
  background: var(--accent);
  padding: 13px 22px;
  border-radius: 6px;
  margin-top: 22px;
  transition: background 0.2s ease;
}
.btn:hover{ background: var(--accent-dark); }

/* =========================================================
   Footer
   ========================================================= */
.site-footer{ border-top: 1px solid var(--rule); padding: 32px 0 44px; margin-top: 20px; }
.site-footer .wrap{
  display:flex;
  justify-content: space-between;
  align-items:center;
  gap: 16px;
  flex-wrap: wrap;
}
.site-footer p{ font-family: var(--mono); font-size: 0.75rem; color: var(--muted); }
.site-footer a{ color: var(--muted); transition: color 0.2s ease; }
.site-footer a:hover{ color: var(--accent); }

@media (prefers-reduced-motion: reduce){
  *{ transition: none !important; }
}