/* ============================================================
   Sandhya Dhanasekar — portfolio site
   Design tokens
   ============================================================ */
:root{
  /* Palette: lime-cream → yale-blue */
  --bg:            #f0f7e8;                      /* very pale lime tint */
  --bg-alt:        #e2f0d2;                      /* light green bg */
  --bg-deep:       #d1e8be;                      /* deeper green bg */
  --card:          #FFFFFF;
  --navy:          #184e77;                      /* yale-blue — headings & dark text */
  --navy-soft:     #1e6091;                      /* baltic-blue */
  --slate:         #3a6a70;                      /* muted teal — body text */
  --slate-light:   #52b69a;                      /* ocean-mist — secondary text */
  --sky:           #168aad;                      /* bondi-blue */
  --sky-deep:      #1a759f;                      /* cerulean — primary accent */
  --sky-pale:      #b5e48c;                      /* light-green — decorative */
  --amber:         #52b69a;                      /* ocean-mist — CTA buttons */
  --amber-deep:    #34a0a490;                    /* tropical-teal w/ alpha */
  --line:          #c2ddb0;                      /* soft green border */
  --shadow:        0 12px 30px -14px rgba(24,78,119,0.18);
  --radius:        18px;
  --max:           1120px;
}


*,*::before,*::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  background:var(--bg);
  color:var(--navy);
  font-family:'Inter',system-ui,sans-serif;
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}

h1,h2,h3,h4{
  font-family:'Fraunces',Georgia,serif;
  color:var(--navy);
  margin:0 0 0.5em;
  font-weight:600;
  letter-spacing:-0.01em;
}
h1{ font-size:clamp(2.3rem,4.5vw,3.6rem); line-height:1.08; font-weight:560; }
h2{ font-size:clamp(1.7rem,3vw,2.4rem); line-height:1.16; }
h3{ font-size:1.3rem; }
p{ margin:0 0 1em; color:var(--slate); }
a{ color:var(--sky-deep); text-decoration:none; }
img{ max-width:100%; display:block; }

.eyebrow{
  font-family:'IBM Plex Mono',monospace;
  font-size:0.72rem;
  letter-spacing:0.14em;
  text-transform:uppercase;
  color:var(--sky-deep);
  font-weight:600;
  display:inline-flex;
  align-items:center;
  gap:8px;
  margin-bottom:14px;
}
.eyebrow::before{
  content:"";
  width:20px; height:1px;
  background:var(--sky-deep);
  display:inline-block;
}

.mono{ font-family:'IBM Plex Mono',monospace; }

.wrap{
  max-width:var(--max);
  margin:0 auto;
  padding:0 32px;
}

section{ padding:88px 0; }
.section-alt{ background:var(--bg-alt); }
.section-deep{ background:var(--navy); color:#fff; }
.section-deep p{ color:#b5e48c; }
.section-deep h2,.section-deep h3{ color:#fff; }

/* ---------- Nav ---------- */
header.site-nav{
  position:sticky; top:0; z-index:50;
  background:rgba(240,247,232,0.88);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.nav-inner{
  max-width:var(--max);
  margin:0 auto;
  padding:16px 32px;
  display:flex;
  align-items:center;
  justify-content:space-between;
}
.brand{
  display:flex; flex-direction:column; gap:2px;
  font-family:'Fraunces',serif; font-weight:700; font-size:1.2rem;
  color:var(--navy);
  letter-spacing:-0.01em;
  line-height:1.1;
}
.brand-tagline{
  font-family:'IBM Plex Mono',monospace;
  font-size:0.62rem;
  font-weight:500;
  letter-spacing:0.08em;
  text-transform:uppercase;
  color:#52b69a;
  display:block;
}
.brand-mark{
  width:38px; height:38px; border-radius:50%;
  background:linear-gradient(135deg,#76c893,#34a0a4);
  display:flex; align-items:center; justify-content:center;
  color:#fff; font-family:'IBM Plex Mono',monospace; font-weight:600; font-size:0.85rem;
  box-shadow:0 4px 12px -4px rgba(52,160,164,0.6);
}
nav.links{ display:flex; align-items:center; gap:34px; }
nav.links a{
  color:#76c893;
  font-size:0.94rem;
  font-weight:500;
  position:relative;
  padding:4px 0;
}
nav.links a::after{
  content:"";
  position:absolute; left:0; bottom:-2px;
  width:0; height:2px; background:#76c893;
  transition:width .25s ease;
}
nav.links a:hover::after, nav.links a.active::after{ width:100%; }
nav.links a:hover{ color:#168aad; }
nav.links a.active{ color:#168aad; }

.btn{
  display:inline-flex; align-items:center; gap:8px;
  padding:13px 28px;
  border-radius:999px;
  font-weight:600;
  font-size:0.92rem;
  border:1px solid transparent;
  cursor:pointer;
  white-space:nowrap;
  transition:transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.btn-primary{
  background:var(--navy);
  color:#fff !important;
}
.btn-primary:hover{ transform:translateY(-2px); box-shadow:var(--shadow); }
.btn-amber{
  background:var(--amber);
  color:#fff !important;
  font-size:1rem;
  padding:15px 34px;
}
.btn-amber:hover{ transform:translateY(-2px); box-shadow:0 14px 26px -12px rgba(82,182,154,0.55); }
nav.links .btn-amber{
  font-size:1.05rem;
  padding:14px 32px;
}
.btn-ghost{
  background:transparent;
  border-color:var(--line);
  color:var(--navy) !important;
}
.btn-ghost:hover{ border-color:var(--sky-deep); color:var(--sky-deep) !important; }

.nav-toggle{ display:none; }

/* ---------- Hero ---------- */
.hero{
  padding:96px 0 60px;
  position:relative;
  overflow:hidden;
}
.hero-grid{
  display:grid;
  grid-template-columns:1.15fr 0.85fr;
  gap:64px;
  align-items:center;
}
.hero h1 span{ color:var(--sky-deep); }
.hero-cta{ display:flex; gap:16px; margin-top:32px; flex-wrap:wrap; }

/* nudge-line signature */
.nudge-line{ position:absolute; inset:0; width:100%; height:100%; z-index:-1; pointer-events:none; }
.nudge-path{
  fill:none; stroke:var(--sky-pale); stroke-width:2;
  stroke-dasharray:6 10; stroke-linecap:round;
}

/* profile placeholder */
.photo-slot{
  position:relative;
  width:min(340px,80vw);
  aspect-ratio:1/1;
  margin:0 auto;
}
.photo-orbit{
  position:absolute; inset:-18px;
  border-radius:50%;
  border:1.5px dashed var(--sky-pale);
  animation:spin 40s linear infinite;
}
.photo-orbit::before{
  content:"";
  position:absolute; top:-4px; left:50%;
  width:8px; height:8px; border-radius:50%;
  background:var(--amber);
  transform:translateX(-50%);
}
@keyframes spin{ to{ transform:rotate(360deg); } }
.photo-frame{
  position:absolute; inset:0;
  border-radius:50%;
  background:linear-gradient(160deg,var(--sky-pale),var(--bg-alt));
  display:flex; align-items:center; justify-content:center;
  flex-direction:column;
  border:1px solid var(--line);
  overflow:hidden;
}
.photo-frame img{ width:100%; height:100%; object-fit:cover; border-radius:50%; }
.photo-placeholder-content{ text-align:center; color:var(--sky-deep); }
.photo-placeholder-content .initials{
  font-family:'Fraunces',serif; font-size:3.4rem; font-weight:600; color:var(--navy-soft);
  line-height:1;
}
.photo-placeholder-content svg{ margin-top:10px; opacity:0.55; }
.photo-placeholder-content .cap{
  font-family:'IBM Plex Mono',monospace; font-size:0.68rem; letter-spacing:0.08em;
  text-transform:uppercase; color:var(--sky-deep); margin-top:8px; opacity:0.75;
}

/* ---------- Stat strip ---------- */
.stats{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:24px;
  margin-top:64px;
  border-top:1px solid var(--line);
  padding-top:40px;
}
.stat .num{
  font-family:'IBM Plex Mono',monospace;
  font-size:2.1rem; font-weight:600; color:var(--sky-deep);
}
.stat .label{ font-size:0.86rem; color:var(--slate); margin-top:4px; }

/* ---------- Cards ---------- */
.card-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:22px;
  margin-top:48px;
}
.card{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:30px 26px;
  transition:transform .25s ease, box-shadow .25s ease;
}
.card:hover{ transform:translateY(-5px); box-shadow:var(--shadow); }
.card .icon{
  width:44px; height:44px; border-radius:12px;
  background:var(--bg-alt);
  display:flex; align-items:center; justify-content:center;
  margin-bottom:18px;
  color:var(--sky-deep);
}
.card h3{ font-size:1.08rem; margin-bottom:8px; }
.card p{ font-size:0.92rem; margin:0; }

/* ---------- Section headers ---------- */
.section-head{ max-width:640px; margin-bottom:20px; }
.section-head p{ font-size:1.05rem; }

/* ---------- Timeline (experience) ---------- */
.timeline{ position:relative; margin-top:56px; }
.timeline::before{
  content:"";
  position:absolute; left:12px; top:6px; bottom:6px;
  width:2px;
  background:repeating-linear-gradient(to bottom,var(--sky-pale) 0 8px,transparent 8px 16px);
}
.tl-item{ position:relative; padding-left:52px; margin-bottom:52px; }
.tl-item:last-child{ margin-bottom:0; }
.tl-dot{
  position:absolute; left:0; top:2px;
  width:26px; height:26px; border-radius:50%;
  background:var(--card);
  border:2px solid var(--sky-deep);
  display:flex; align-items:center; justify-content:center;
}
.tl-dot::after{ content:""; width:9px; height:9px; border-radius:50%; background:var(--sky-deep); }
.tl-date{ font-family:'IBM Plex Mono',monospace; font-size:0.78rem; color:var(--sky-deep); font-weight:600; margin-bottom:6px; display:block; }
.tl-role{ margin-bottom:2px; }
.tl-org{ color:var(--slate); font-size:0.94rem; margin-bottom:14px; font-weight:500; }
.tl-item ul{ margin:0; padding-left:20px; color:var(--slate); }
.tl-item li{ margin-bottom:8px; font-size:0.96rem; }

.side-list{ margin-top:70px; }
.side-list h3{ margin-bottom:26px; }
.leader-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:22px; }
.leader-card{
  background:var(--card); border:1px solid var(--line); border-radius:16px; padding:24px;
}
.leader-card .tl-date{ margin-bottom:10px; }
.leader-card p{ font-size:0.9rem; margin:0; }

/* ---------- Projects ---------- */
.project-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:24px;
  margin-top:50px;
}
.project-card{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:28px;
  display:flex; flex-direction:column;
  transition:transform .25s ease, box-shadow .25s ease;
}
.project-card:hover{ transform:translateY(-5px); box-shadow:var(--shadow); }
.tag{
  align-self:flex-start;
  font-family:'IBM Plex Mono',monospace;
  font-size:0.68rem; letter-spacing:0.06em; text-transform:uppercase;
  background:var(--bg-alt); color:var(--sky-deep);
  padding:5px 11px; border-radius:999px; margin-bottom:16px;
}
.project-card h3{ margin-bottom:10px; }
.project-card p{ font-size:0.92rem; flex-grow:1; }
.method-tags{ display:flex; flex-wrap:wrap; gap:6px; margin-top:16px; }
.method-tags span{
  font-size:0.72rem; color:var(--slate); background:var(--bg);
  border:1px solid var(--line); padding:3px 9px; border-radius:999px;
}

/* ---------- Skills ---------- */
.skill-cols{ display:grid; grid-template-columns:1fr 1fr; gap:40px; margin-top:40px; }
.skill-pills{ display:flex; flex-wrap:wrap; gap:10px; margin-top:16px; }
.pill{
  background:var(--card); border:1px solid var(--line);
  padding:8px 16px; border-radius:999px; font-size:0.88rem; color:var(--navy-soft);
}

/* ---------- Quote / philosophy ---------- */
.philosophy{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:24px;
  padding:48px;
  position:relative;
}
.philosophy .mark{
  font-family:'Fraunces',serif; font-size:4rem; color:var(--sky-pale);
  position:absolute; top:14px; left:28px; line-height:1;
}
.philosophy blockquote{
  margin:0; font-family:'Fraunces',serif; font-size:1.4rem; font-style:italic;
  color:var(--navy); line-height:1.5; padding-left:8px;
}
.philosophy cite{ display:block; margin-top:18px; font-style:normal; color:var(--slate); font-size:0.9rem; }

/* ---------- Contact ---------- */
.contact-grid{ display:grid; grid-template-columns:1fr 1fr; gap:56px; align-items:start; }
.contact-detail{ display:flex; align-items:center; gap:14px; margin-bottom:20px; }
.contact-detail .icon{
  width:42px; height:42px; border-radius:12px; background:var(--bg-alt);
  display:flex; align-items:center; justify-content:center; color:var(--sky-deep); flex-shrink:0;
}
.contact-detail a, .contact-detail span{ color:var(--navy); font-weight:500; }
form.contact-form{ display:flex; flex-direction:column; gap:16px; }
form.contact-form input, form.contact-form textarea{
  font-family:'Inter',sans-serif;
  padding:14px 16px; border-radius:12px; border:1px solid var(--line);
  background:var(--card); font-size:0.95rem; color:var(--navy);
}
form.contact-form label{ font-size:0.82rem; color:var(--slate); margin-bottom:-10px; font-weight:600; }
form.contact-form textarea{ resize:vertical; min-height:120px; }

/* ---------- Footer ---------- */
footer{
  border-top:1px solid var(--line);
  padding:44px 0;
  background:var(--bg-alt);
}
.footer-inner{ display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:18px; }
.footer-links{ display:flex; gap:22px; }
.footer-links a{ color:var(--slate); font-size:0.9rem; }
.footer-links a:hover{ color:var(--sky-deep); }
.copyright{ font-size:0.82rem; color:var(--slate-light); }

/* ---------- Reveal on scroll ---------- */
.reveal{ opacity:0; transform:translateY(18px); transition:opacity .7s ease, transform .7s ease; }
.reveal.in{ opacity:1; transform:none; }

/* ---------- Responsive ---------- */
@media (max-width:920px){
  .hero-grid{ grid-template-columns:1fr; }
  .hero-grid .photo-slot{ order:-1; margin-bottom:20px; width:220px; }
  .stats{ grid-template-columns:repeat(2,1fr); }
  .card-grid{ grid-template-columns:repeat(2,1fr); }
  .project-grid{ grid-template-columns:repeat(2,1fr); }
  .skill-cols{ grid-template-columns:1fr; }
  .contact-grid{ grid-template-columns:1fr; }
  .leader-grid{ grid-template-columns:1fr; }
}
@media (max-width:640px){
  section{ padding:60px 0; }
  .wrap{ padding:0 20px; }
  nav.links{ position:fixed; top:70px; left:0; right:0; background:var(--bg);
    flex-direction:column; padding:24px; border-bottom:1px solid var(--line);
    transform:translateY(-130%); transition:transform .3s ease; gap:18px; }
  nav.links.open{ transform:translateY(0); }
  .nav-toggle{ display:flex; flex-direction:column; gap:5px; background:none; border:none; cursor:pointer; padding:8px; }
  .nav-toggle span{ width:22px; height:2px; background:var(--navy); }
  .stats{ grid-template-columns:1fr 1fr; }
  .card-grid{ grid-template-columns:1fr; }
  .project-grid{ grid-template-columns:1fr; }
  .footer-inner{ flex-direction:column; align-items:flex-start; }
}