/* =========================================================
   SIDHARTH RAJ — PORTFOLIO
   Direction: a controls engineer's own HMI/console — dark
   instrumentation panel background, phosphor-green "online"
   status as the primary signal, cyan as the data accent,
   set in a monospace display face with a clean sans body.
   The hero is a live-look telemetry panel pulled from the
   actual home-lab sensor stack (temp/RH/CO2/presence) plus
   a boot-sequence type-in, because that IS this person's
   world. The lab section carries a real gallery/lightbox.
   ========================================================= */

:root{
  --bg: #10161A;
  --bg-raise: #161D22;
  --panel: #1B2429;
  --panel-2: #222C32;
  --line: rgba(154,196,192,0.14);
  --line-strong: rgba(154,196,192,0.28);
  --text: #DEE8E6;
  --text-dim: #8AA09C;
  --text-faint: #56645F;
  --green: #49E39A;
  --green-dim: #2C8F63;
  --cyan: #49C6E8;
  --amber: #E8A23D;
  --red: #E8604D;

  --display: "JetBrains Mono", "IBM Plex Mono", monospace;
  --body: "Inter", -apple-system, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", "IBM Plex Mono", monospace;

  --container: 1180px;
}

*{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:var(--body);
  -webkit-font-smoothing:antialiased;
  background-image:
    radial-gradient(circle at 1px 1px, rgba(154,196,192,0.09) 1px, transparent 0);
  background-size: 26px 26px;
}
img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
h1,h2,h3,h4{ margin:0; font-family:var(--display); color:var(--text); font-weight:700; letter-spacing:-0.01em; }
p{ line-height:1.7; margin:0 0 1em; color:var(--text-dim); }
ul{ margin:0; padding:0; }
.wrap{ max-width:var(--container); margin:0 auto; padding:0 28px; }
section{ padding:96px 0; border-bottom:1px solid var(--line); }
section:last-of-type{ border-bottom:none; }

@media (prefers-reduced-motion: reduce){
  *{ animation-duration:0.001ms !important; animation-iteration-count:1 !important; transition-duration:0.001ms !important; scroll-behavior:auto !important; }
}

a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible{
  outline:2px solid var(--green);
  outline-offset:3px;
}

/* ---------- eyebrow ---------- */
.eyebrow{
  font-family:var(--mono); font-size:12px; letter-spacing:0.12em; text-transform:uppercase;
  color:var(--green); display:flex; align-items:center; gap:10px; margin-bottom:16px;
}
.eyebrow::before{ content:"//"; color:var(--text-faint); }
.eyebrow .dot{
  width:6px; height:6px; border-radius:50%; background:var(--green); display:inline-block;
  box-shadow:0 0 8px var(--green);
}

.section-head{ max-width:640px; margin-bottom:48px; }
.section-head h2{ font-size:clamp(24px,3vw,34px); margin-bottom:12px; text-transform:none; }
.section-head p{ font-size:15.5px; }

/* ---------- top bar ---------- */
.topbar{
  position:sticky; top:0; z-index:60;
  background:rgba(16,22,26,0.88); backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.topbar .bar{
  max-width:var(--container); margin:0 auto; padding:14px 28px;
  display:flex; align-items:center; justify-content:space-between; gap:20px;
}
.brand{ display:flex; align-items:center; gap:10px; font-family:var(--mono); font-size:14px; color:var(--text); }
.brand .dot{ width:8px; height:8px; border-radius:50%; background:var(--green); box-shadow:0 0 8px var(--green); animation:blink-soft 2.6s ease-in-out infinite; }
@keyframes blink-soft{ 0%,100%{ opacity:1; } 50%{ opacity:0.45; } }
.brand .path{ color:var(--text-faint); }
nav.tabs{ display:flex; gap:2px; }
nav.tabs a{
  font-family:var(--mono); font-size:12.5px; color:var(--text-dim); padding:8px 14px;
  border:1px solid transparent; border-radius:3px; transition:color .15s, border-color .15s, background .15s;
}
nav.tabs a:hover{ color:var(--text); background:var(--panel); border-color:var(--line); }
.nav-toggle{
  display:none; background:none; border:1px solid var(--line); color:var(--text);
  width:38px; height:38px; border-radius:4px; cursor:pointer; font-family:var(--mono); font-size:16px;
}
@media (max-width:900px){
  nav.tabs{ display:none; position:absolute; top:100%; left:0; right:0; flex-direction:column; background:var(--bg-raise); border-bottom:1px solid var(--line); padding:8px; }
  nav.tabs.open{ display:flex; }
  .nav-toggle{ display:block; }
}

/* ---------- hero ---------- */
.hero{ padding:64px 0 80px; border-bottom:1px solid var(--line); }
.hero-grid{ display:grid; grid-template-columns:1.05fr 0.95fr; gap:56px; align-items:center; }
@media (max-width:960px){ .hero-grid{ grid-template-columns:1fr; } }

.hero h1{ font-size:clamp(36px,5vw,58px); line-height:1.05; margin-bottom:14px; }
.hero h1 .accent{ color:var(--green); }
.hero .role{
  font-family:var(--mono); font-size:14px; color:var(--cyan); letter-spacing:0.04em; margin-bottom:22px;
}
.hero .lede{ font-size:16.5px; max-width:52ch; margin-bottom:30px; }
.hero .cta-row{ display:flex; gap:14px; flex-wrap:wrap; }

.btn{
  font-family:var(--mono); font-size:12.5px; letter-spacing:0.05em;
  padding:13px 22px; border-radius:4px; display:inline-flex; align-items:center; gap:9px;
  border:1px solid var(--line-strong); cursor:pointer; transition:transform .15s ease, background .15s ease, border-color .15s ease, color .15s ease;
}
.btn-primary{ background:var(--green); border-color:var(--green); color:#08130E; font-weight:700; }
.btn-primary:hover{ background:#6CF0B3; }
.btn-ghost{ color:var(--text); background:transparent; }
.btn-ghost:hover{ border-color:var(--cyan); color:var(--cyan); }
.btn:hover{ transform:translateY(-1px); }

/* ---------- telemetry panel (signature element) ---------- */
.telemetry{
  background:var(--panel); border:1px solid var(--line); border-radius:8px; overflow:hidden;
  box-shadow:0 30px 60px -30px rgba(0,0,0,0.6);
}
.telemetry .tbar{
  display:flex; align-items:center; justify-content:space-between;
  padding:10px 16px; background:var(--panel-2); border-bottom:1px solid var(--line);
  font-family:var(--mono); font-size:11px; color:var(--text-faint); letter-spacing:0.06em;
}
.telemetry .tbar .status{ display:flex; align-items:center; gap:7px; color:var(--green); }
.telemetry .tbar .status .dot{ width:6px; height:6px; border-radius:50%; background:var(--green); box-shadow:0 0 6px var(--green); }
.telemetry-body{ padding:18px 16px 20px; }
.boot-line{
  font-family:var(--mono); font-size:12.5px; color:var(--text-dim); margin-bottom:3px; min-height:17px;
}
.boot-line .prompt{ color:var(--green); }
.boot-line.cursor::after{ content:"▌"; color:var(--green); animation:blink-soft 1s step-end infinite; margin-left:2px; }

.readout-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:1px; background:var(--line); margin-top:16px; border-radius:6px; overflow:hidden; }
.readout{ background:var(--panel); padding:14px 12px; }
.readout .l{ font-family:var(--mono); font-size:10px; color:var(--text-faint); letter-spacing:0.08em; text-transform:uppercase; margin-bottom:6px; display:block; }
.readout .v{ font-family:var(--mono); font-size:19px; color:var(--text); }
.readout .v .u{ font-size:12px; color:var(--text-faint); margin-left:2px; }
.readout.ok .v{ color:var(--green); }
.readout.warn .v{ color:var(--amber); }

.scope{ margin-top:16px; background:var(--panel-2); border:1px solid var(--line); border-radius:6px; padding:10px 12px 6px; }
.scope .l{ font-family:var(--mono); font-size:10px; color:var(--text-faint); letter-spacing:0.08em; text-transform:uppercase; margin-bottom:6px; }
.scope svg{ width:100%; height:56px; display:block; }
.scope-line{ fill:none; stroke:var(--cyan); stroke-width:1.6; }

/* ---------- pillars (about) ---------- */
.pillar-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:1px; background:var(--line); border:1px solid var(--line); border-radius:8px; overflow:hidden; }
.pillar{ background:var(--panel); padding:30px 26px; }
.pillar .tag{ font-family:var(--mono); font-size:11px; color:var(--green); letter-spacing:0.08em; margin-bottom:14px; display:block; }
.pillar h3{ font-size:18px; margin-bottom:10px; text-transform:none; }
.pillar p{ font-size:14px; margin:0; }
@media (max-width:820px){ .pillar-grid{ grid-template-columns:1fr; } }

/* ---------- experience log ---------- */
.log{ position:relative; padding-left:28px; }
.log::before{ content:""; position:absolute; left:5px; top:6px; bottom:6px; width:1px; background:var(--line-strong); }
.log-entry{ position:relative; padding-bottom:40px; }
.log-entry:last-child{ padding-bottom:0; }
.log-entry::before{
  content:""; position:absolute; left:-28px; top:5px; width:11px; height:11px; border-radius:50%;
  background:var(--bg); border:2px solid var(--green);
}
.log-entry .meta{ font-family:var(--mono); font-size:11.5px; color:var(--text-faint); letter-spacing:0.04em; margin-bottom:6px; }
.log-entry .meta .loc{ color:var(--cyan); }
.log-entry h3{ font-size:19px; text-transform:none; margin-bottom:2px; }
.log-entry .role{ font-family:var(--mono); font-size:13px; color:var(--green); margin-bottom:14px; display:block; }
.log-entry ul{ list-style:none; display:grid; gap:9px; }
.log-entry li{ font-size:14.5px; color:var(--text-dim); padding-left:18px; position:relative; }
.log-entry li::before{ content:"›"; position:absolute; left:0; color:var(--cyan); }
.log-entry .link{ font-family:var(--mono); font-size:12px; color:var(--cyan); }

/* ---------- education ---------- */
.edu-grid{ display:grid; grid-template-columns:1fr 1fr; gap:24px; }
@media (max-width:820px){ .edu-grid{ grid-template-columns:1fr; } }
.edu-card{ background:var(--panel); border:1px solid var(--line); border-radius:8px; padding:28px 26px; }
.edu-card .meta{ font-family:var(--mono); font-size:11.5px; color:var(--text-faint); margin-bottom:10px; }
.edu-card h3{ font-size:18px; text-transform:none; margin-bottom:4px; }
.edu-card .role{ font-family:var(--mono); font-size:13px; color:var(--cyan); margin-bottom:6px; display:block; }
.edu-card .loc{ font-size:13px; color:var(--text-faint); margin-bottom:16px; }
.coursework{ display:flex; flex-wrap:wrap; gap:8px; }
.coursework span{
  font-family:var(--mono); font-size:11px; color:var(--text-dim); border:1px solid var(--line); padding:5px 10px; border-radius:3px;
}

/* ---------- projects ---------- */
.project-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:24px; }
@media (max-width:980px){ .project-grid{ grid-template-columns:1fr 1fr; } }
@media (max-width:640px){ .project-grid{ grid-template-columns:1fr; } }
.project-card{ background:var(--panel); border:1px solid var(--line); border-radius:8px; overflow:hidden; display:flex; flex-direction:column; transition:border-color .15s ease, transform .15s ease; }
.project-card:hover{ border-color:var(--line-strong); transform:translateY(-2px); }
.project-card .thumb{ aspect-ratio:16/10; overflow:hidden; background:var(--panel-2); }
.project-card .thumb img{ width:100%; height:100%; object-fit:cover; }
.project-card .body{ padding:20px 20px 22px; display:flex; flex-direction:column; flex:1; }
.project-card .year{ font-family:var(--mono); font-size:11px; color:var(--green); margin-bottom:8px; }
.project-card h3{ font-size:16.5px; text-transform:none; margin-bottom:10px; line-height:1.3; }
.project-card ul{ list-style:none; display:grid; gap:7px; margin-bottom:0; }
.project-card li{ font-size:13.5px; color:var(--text-dim); padding-left:16px; position:relative; }
.project-card li::before{ content:"›"; position:absolute; left:0; color:var(--cyan); }
.projects-more{ text-align:center; margin-top:36px; }

/* ---------- skills (loaded modules) ---------- */
.skills-grid{ display:grid; grid-template-columns:repeat(2,1fr); gap:28px 40px; }
@media (max-width:760px){ .skills-grid{ grid-template-columns:1fr; } }
.skill-group h3{
  font-family:var(--mono); font-size:12px; color:var(--cyan); letter-spacing:0.08em; text-transform:uppercase;
  margin-bottom:14px; text-transform:uppercase;
}
.chip-row{ display:flex; flex-wrap:wrap; gap:8px; }
.chip{
  font-family:var(--mono); font-size:12px; color:var(--text-dim); border:1px solid var(--line);
  padding:6px 11px; border-radius:4px; background:var(--panel);
}
.badges-row{ display:flex; gap:20px; flex-wrap:wrap; margin-top:44px; padding-top:36px; border-top:1px solid var(--line); }
.badge-item{ display:flex; align-items:flex-start; gap:12px; max-width:340px; }
.badge-item .ico{ color:var(--amber); font-family:var(--mono); font-size:18px; line-height:1; margin-top:2px; }
.badge-item h4{ font-size:14px; text-transform:none; margin-bottom:3px; }
.badge-item p{ font-size:13px; margin:0; }

/* ---------- lab gallery ---------- */
.lab-intro{ display:flex; justify-content:space-between; align-items:flex-end; gap:24px; flex-wrap:wrap; margin-bottom:32px; }
.gallery-grid{
  display:grid; grid-template-columns:repeat(4,1fr); grid-auto-rows:150px; gap:10px;
}
.gallery-grid .g-item{
  position:relative; overflow:hidden; border-radius:6px; cursor:pointer;
  border:1px solid var(--line); background:var(--panel);
}
.gallery-grid .g-item img{ width:100%; height:100%; object-fit:cover; transition:transform .35s ease, filter .35s ease; filter:saturate(0.9) brightness(0.92); }
.gallery-grid .g-item:hover img{ transform:scale(1.06); filter:saturate(1) brightness(1); }
.gallery-grid .g-item .cap{
  position:absolute; left:0; right:0; bottom:0; padding:8px 10px 7px;
  font-family:var(--mono); font-size:11px; color:#fff; letter-spacing:0.02em;
  background:linear-gradient(transparent, rgba(0,0,0,0.75));
  opacity:0; transform:translateY(4px); transition:opacity .2s ease, transform .2s ease;
}
.gallery-grid .g-item:hover .cap{ opacity:1; transform:translateY(0); }
.gallery-grid .g-item.big{ grid-column:span 2; grid-row:span 2; }
@media (max-width:900px){
  .gallery-grid{ grid-template-columns:repeat(2,1fr); grid-auto-rows:170px; }
  .gallery-grid .g-item.big{ grid-column:span 2; grid-row:span 1; }
}
@media (max-width:520px){
  .gallery-grid{ grid-template-columns:1fr 1fr; grid-auto-rows:140px; }
}

/* lightbox */
.lightbox{
  position:fixed; inset:0; background:rgba(8,12,14,0.94); z-index:200;
  display:none; align-items:center; justify-content:center; padding:24px;
  backdrop-filter:blur(4px);
}
.lightbox.open{ display:flex; }
.lightbox-inner{ max-width:min(1100px,92vw); max-height:88vh; width:100%; display:flex; flex-direction:column; align-items:center; gap:14px; }
.lightbox img{ max-width:100%; max-height:70vh; border-radius:6px; border:1px solid var(--line-strong); object-fit:contain; background:var(--panel); }
.lightbox .lb-meta{ display:flex; justify-content:space-between; align-items:center; width:100%; font-family:var(--mono); color:var(--text-dim); font-size:12.5px; }
.lightbox .lb-caption{ color:var(--text); }
.lb-close, .lb-prev, .lb-next{
  position:absolute; background:var(--panel); border:1px solid var(--line-strong); color:var(--text);
  width:44px; height:44px; border-radius:50%; display:flex; align-items:center; justify-content:center;
  cursor:pointer; font-family:var(--mono); font-size:18px; transition:border-color .15s, color .15s;
}
.lb-close:hover, .lb-prev:hover, .lb-next:hover{ border-color:var(--green); color:var(--green); }
.lb-close{ top:22px; right:22px; }
.lb-prev{ left:22px; top:50%; transform:translateY(-50%); }
.lb-next{ right:22px; top:50%; transform:translateY(-50%); }
@media (max-width:640px){
  .lb-prev{ left:8px; } .lb-next{ right:8px; } .lb-close{ top:10px; right:10px; }
}

/* ---------- contact ---------- */
.contact-grid{ display:grid; grid-template-columns:1fr 1fr; gap:56px; align-items:start; }
@media (max-width:860px){ .contact-grid{ grid-template-columns:1fr; } }
form.contact-form{ display:grid; gap:16px; }
.field{ display:flex; flex-direction:column; gap:6px; }
.field label{ font-family:var(--mono); font-size:11px; letter-spacing:0.06em; text-transform:uppercase; color:var(--text-faint); }
.field input, .field textarea{
  background:var(--panel); border:1px solid var(--line); color:var(--text);
  padding:12px 14px; font-family:var(--body); font-size:14px; border-radius:4px;
}
.field input:focus, .field textarea:focus{ border-color:var(--green); outline:none; }
.field textarea{ resize:vertical; min-height:120px; }
.social-list{ display:grid; gap:14px; }
.social-list a{
  display:flex; align-items:center; gap:10px; font-family:var(--mono); font-size:14px; color:var(--text-dim);
  border:1px solid var(--line); padding:14px 16px; border-radius:6px; transition:border-color .15s, color .15s;
}
.social-list a:hover{ border-color:var(--cyan); color:var(--cyan); }

/* ---------- footer ---------- */
footer{ padding:30px 0; }
.footer-row{
  display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:10px;
  font-family:var(--mono); font-size:12px; color:var(--text-faint);
}