/* =========================================================
   Roshan Dharan — Portfolio (Enhanced)
   No build step. Pure HTML/CSS/JS for GitHub Pages.
   ========================================================= */

:root{
  --bg: #0b1020;
  --bg2:#0a1228;
  --surface: rgba(255,255,255,.06);
  --surface2: rgba(255,255,255,.10);
  --border: rgba(255,255,255,.12);
  --text:#eef2ff;
  --muted:#cbd5e1;
  --muted2:#94a3b8;
  --accent:#7c3aed; /* violet */
  --accent2:#22c55e; /* green */
  --warn:#f59e0b;
  --shadow: 0 14px 50px rgba(0,0,0,.35);
  --radius: 18px;
  --radius2: 26px;
  --max: 1120px;
  --focus: 0 0 0 4px rgba(124,58,237,.35);
  --gridGap: 18px;
  --font: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

[data-theme="light"]{
  --bg:#f7f8ff;
  --bg2:#eef2ff;
  --surface: rgba(15,23,42,.05);
  --surface2: rgba(15,23,42,.08);
  --border: rgba(15,23,42,.14);
  --text:#0f172a;
  --muted:#334155;
  --muted2:#475569;
  --shadow: 0 16px 48px rgba(2,6,23,.10);
  --focus: 0 0 0 4px rgba(124,58,237,.22);
}

*{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  font-family: var(--font);
  color: var(--text);
  background:
    radial-gradient(900px 500px at 15% 0%, rgba(124,58,237,.28), transparent 60%),
    radial-gradient(700px 420px at 85% 10%, rgba(34,197,94,.18), transparent 55%),
    radial-gradient(700px 420px at 50% 95%, rgba(245,158,11,.10), transparent 60%),
    linear-gradient(180deg, var(--bg), var(--bg2));
  min-height:100vh;
}

a{ color:inherit; text-decoration:none; }
a:hover{ text-decoration:underline; text-underline-offset: 4px; }

img{ max-width:100%; display:block; }
ul{ margin: 10px 0 0 18px; }
li{ color: var(--muted); line-height:1.6; margin: 8px 0; }
p{ color: var(--muted); line-height:1.7; margin: 10px 0; }
h1,h2,h3{ margin:0; line-height:1.2; letter-spacing:-.02em; }
h1{ font-size: clamp(32px, 4.1vw, 52px); }
h2{ font-size: clamp(24px, 3vw, 34px); margin-bottom: 10px; }
h3{ font-size: 18px; }

.container{
  width: min(var(--max), calc(100% - 44px));
  margin: 0 auto;
}

.skip-link{
  position:absolute;
  left:-999px; top: 10px;
  padding:10px 12px;
  border-radius: 10px;
  background: var(--text);
  color: var(--bg);
  z-index: 9999;
}
.skip-link:focus{ left: 14px; outline: none; box-shadow: var(--focus); }

nav{
  position: sticky;
  top:0;
  z-index: 50;
  backdrop-filter: blur(12px);
  background: linear-gradient(180deg, rgba(10,14,30,.84), rgba(10,14,30,.60));
  border-bottom: 1px solid rgba(255,255,255,.08);
}
[data-theme="light"] nav{
  background: linear-gradient(180deg, rgba(247,248,255,.90), rgba(247,248,255,.72));
  border-bottom: 1px solid rgba(15,23,42,.12);
}

.nav-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding: 14px 0;
  gap: 14px;
}

.brand{
  display:flex;
  align-items:center;
  gap: 10px;
  white-space:nowrap;
}
.brand-dot{
  width: 11px; height: 11px; border-radius: 999px;
  background: radial-gradient(circle at 30% 30%, #fff, rgba(255,255,255,.12)), linear-gradient(135deg, var(--accent), var(--accent2));
  box-shadow: 0 0 0 3px rgba(124,58,237,.18);
}
.brand strong{ font-weight: 760; letter-spacing:-.02em; }

.nav-actions{ display:flex; align-items:center; gap: 10px; }
.nav-links{
  display:flex;
  gap: 12px;
  align-items:center;
}
.nav-links a{
  padding: 8px 10px;
  border-radius: 12px;
  color: var(--muted);
  font-weight: 560;
  text-decoration:none;
}
.nav-links a[aria-current="page"]{
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  box-shadow: 0 10px 30px rgba(0,0,0,.12);
}
.nav-links a:hover{
  text-decoration:none;
  background: var(--surface);
  color: var(--text);
}

.icon-btn{
  appearance:none;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  padding: 10px 11px;
  border-radius: 14px;
  cursor:pointer;
  box-shadow: 0 10px 24px rgba(0,0,0,.12);
}
.icon-btn:hover{ transform: translateY(-1px); background: var(--surface2); }
.icon-btn:active{ transform: translateY(0px); }
.icon-btn:focus{ outline:none; box-shadow: var(--focus); }

.hamburger{ display:none; }
@media (max-width: 860px){
  .nav-links{
    position: fixed;
    left: 14px;
    right: 14px;
    top: 70px;
    padding: 12px;
    border-radius: 18px;
    border: 1px solid var(--border);
    background: color-mix(in oklab, var(--bg2) 70%, transparent);
    box-shadow: var(--shadow);
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity .18s ease, transform .18s ease;
  }
  .nav-links.open{
    opacity: 1;
    transform: translateY(0px);
    pointer-events: auto;
  }
  .nav-links a{ width: 100%; }
  .hamburger{ display:inline-flex; }
}

.hero{
  padding: 56px 0 26px;
}
.hero-grid{
  display:grid;
  grid-template-columns: 1.25fr .75fr;
  gap: 26px;
  align-items: center;
}
@media (max-width: 920px){
  .hero-grid{ grid-template-columns: 1fr; }
}

.kicker{
  display:inline-flex;
  gap:10px;
  align-items:center;
  padding: 8px 12px;
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 999px;
  color: var(--muted);
  font-weight: 600;
  width: fit-content;
}
.kicker .dot{
  width: 8px; height: 8px; border-radius: 999px;
  background: var(--accent2);
  box-shadow: 0 0 0 3px rgba(34,197,94,.18);
}

.lead{
  font-size: 16px;
  color: var(--muted);
}
.accent{
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.badges{
  display:flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 16px 0 14px;
}
.badge{
  font-size: 13px;
  padding: 8px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--muted);
}

.cta-row{ display:flex; flex-wrap:wrap; gap: 10px; margin-top: 14px; }

.btn{
  display:inline-flex;
  align-items:center;
  gap: 10px;
  padding: 11px 14px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  text-decoration:none;
  font-weight: 650;
  box-shadow: 0 10px 26px rgba(0,0,0,.12);
}
.btn:hover{ text-decoration:none; transform: translateY(-1px); background: var(--surface2); }
.btn:active{ transform: translateY(0); }
.btn.primary{
  background: linear-gradient(135deg, rgba(124,58,237,.92), rgba(34,197,94,.75));
  border-color: rgba(255,255,255,.18);
}
.btn:focus{ outline:none; box-shadow: var(--focus); }

.hero-card{
  border-radius: var(--radius2);
  border: 1px solid var(--border);
  background:
    radial-gradient(500px 260px at 20% 0%, rgba(124,58,237,.25), transparent 60%),
    radial-gradient(500px 260px at 80% 0%, rgba(34,197,94,.18), transparent 55%),
    linear-gradient(180deg, var(--surface), transparent);
  box-shadow: var(--shadow);
  padding: 18px;
  position: relative;
  overflow: hidden;
}
.hero-card::after{
  content:"";
  position:absolute;
  inset:-2px;
  background: radial-gradient(520px 230px at 60% 0%, rgba(255,255,255,.08), transparent 55%);
  pointer-events:none;
}
.profile{
  display:grid;
  gap: 12px;
}
.profile-img{
  width: 100%;
  aspect-ratio: 1 / 1;
  border-radius: 22px;
  border: 1px solid var(--border);
  overflow:hidden;
  background: linear-gradient(135deg, rgba(124,58,237,.22), rgba(34,197,94,.16));
}
.profile-img img{ width:100%; height:100%; object-fit: cover; }
.profile-stats{
  display:grid;
  grid-template-columns: repeat(2,1fr);
  gap: 10px;
}
.stat{
  padding: 12px;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: var(--surface);
}
.stat .num{
  font-weight: 820;
  letter-spacing:-.02em;
  font-size: 20px;
}
.stat .label{ color: var(--muted2); font-size: 13px; margin-top: 4px; }

.section{
  padding: 34px 0;
}
.section-head{
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  gap: 18px;
  margin-bottom: 18px;
}
.section-head p{ margin: 0; max-width: 62ch; }

.grid{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gridGap);
}
@media (max-width: 980px){ .grid{ grid-template-columns: repeat(2, 1fr);} }
@media (max-width: 640px){ .grid{ grid-template-columns: 1fr;} }

.card{
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: linear-gradient(180deg, var(--surface), transparent);
  box-shadow: 0 10px 30px rgba(0,0,0,.10);
  padding: 16px;
  position: relative;
  overflow:hidden;
}
.card:hover{ transform: translateY(-2px); background: linear-gradient(180deg, var(--surface2), transparent); }
.card h3{ margin-top: 10px; }
.meta{
  color: var(--muted2);
  font-size: 13px;
  margin-top: 6px;
}

.media{
  border-radius: 16px;
  border: 1px solid var(--border);
  background: color-mix(in oklab, var(--surface) 70%, transparent);
  overflow:hidden;
}
.media.project, .media.award { aspect-ratio: 16 / 10; }
.media.logo{
  width: 64px;
  height: 64px;
  border-radius: 16px;
  display: grid;
  place-items: center;
  background: linear-gradient(
    180deg,
    color-mix(in oklab, var(--surface2) 80%, transparent),
    color-mix(in oklab, var(--surface) 60%, transparent)
  );
  border: 1px solid var(--border);
  flex-shrink: 0;
}
.media img{ width:100%; height:100%; object-fit: cover; }
.media.logo img{
  max-width: 80%;
  max-height: 80%;
  width: auto;
  height: auto;
  object-fit: contain;
  filter: saturate(1.05) contrast(1.05);
}

.pills{
  display:flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}
.pill{
  font-size: 12px;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--muted);
  cursor:pointer;
  user-select:none;
}
.pill[aria-pressed="true"]{
  background: color-mix(in oklab, var(--accent) 28%, var(--surface));
  color: var(--text);
}

.toolbar{
  display:flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items:center;
  margin: 12px 0 18px;
}
.input{
  flex: 1;
  min-width: 220px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  padding: 12px 12px;
  font-size: 14px;
}
.input::placeholder{ color: color-mix(in oklab, var(--muted2) 70%, transparent); }
.input:focus{ outline:none; box-shadow: var(--focus); }

.select{
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  padding: 11px 12px;
  font-size: 14px;
}
.select:focus{ outline:none; box-shadow: var(--focus); }

.timeline{
  display:grid;
  gap: var(--gridGap);
}
.timeline .card{
  padding: 18px;
}
.timeline-head{
  display:flex;
  gap: 14px;
  align-items:center;
}
.timeline-head .media.logo{
  width: 64px;
  height: 64px;
  flex: 0 0 64px;
}


hr.sep{
  border:none;
  height: 1px;
  background: color-mix(in oklab, var(--border) 75%, transparent);
  margin: 18px 0;
}

footer{
  padding: 26px 0 38px;
  color: var(--muted2);
  border-top: 1px solid rgba(255,255,255,.08);
  margin-top: 18px;
}
[data-theme="light"] footer{
  border-top: 1px solid rgba(15,23,42,.10);
}

.toast{
  position: fixed;
  left: 50%;
  transform: translateX(-50%);
  bottom: 18px;
  z-index: 70;
  padding: 10px 12px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: color-mix(in oklab, var(--bg2) 74%, transparent);
  color: var(--text);
  box-shadow: var(--shadow);
  display:none;
}
.toast.show{ display:block; }

.modal-backdrop{
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.55);
  z-index: 80;
  display:none;
  align-items:center;
  justify-content:center;
  padding: 20px;
}
.modal-backdrop.open{ display:flex; }
.modal{
  width: min(980px, 100%);
  border-radius: 20px;
  border: 1px solid var(--border);
  background: color-mix(in oklab, var(--bg2) 84%, transparent);
  box-shadow: var(--shadow);
  overflow:hidden;
}
.modal header{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap: 12px;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
}
.modal header strong{ font-weight: 760; }
.modal .body{ padding: 14px; }
.modal .body img{
  width: 100%;
  height: auto;
  border-radius: 16px;
  border: 1px solid var(--border);
}
kbd{
  font-family: var(--mono);
  font-size: 12px;
  padding: 2px 6px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
}

.reveal{ opacity: 0; transform: translateY(10px); transition: opacity .5s ease, transform .5s ease; }
.reveal.in{ opacity: 1; transform: translateY(0px); }

button.media{ padding:0; cursor:pointer; color:inherit; }
button.media:focus{ outline:none; box-shadow: var(--focus); }