/* ============================================================
   Dhruv Shah — Portfolio
   Design system: modern dark / terminal
   ============================================================ */

/* ---------- Tokens ---------- */
:root {
  /* surfaces */
  --bg:        #0a0c0f;
  --bg-soft:   #0f1318;
  --surface:   #12171d;
  --surface-2: #161c23;
  --line:      #232b34;
  --line-soft: #1a2128;

  /* text */
  --text:      #e8ebee;
  --text-mut:  #9aa4af;
  --text-dim:  #687078;

  /* accent */
  --accent:      #6ee7b7;
  --accent-dim:  #3ba776;
  --accent-glow: rgba(110, 231, 183, 0.14);

  /* type */
  --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-disp: "Space Grotesk", var(--font-sans);
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;

  /* metrics */
  --maxw: 1080px;
  --pad:  clamp(1.25rem, 5vw, 4rem);
  --radius: 14px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
  -webkit-text-size-adjust: 100%;
  overflow-x: hidden;
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  font-size: 16px;
  letter-spacing: -0.011em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* ambient background grid + glow */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(900px 500px at 80% -10%, var(--accent-glow), transparent 60%),
    radial-gradient(700px 500px at 0% 10%, rgba(96,128,255,0.06), transparent 55%);
  pointer-events: none;
}
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 48px 48px;
  -webkit-mask-image: radial-gradient(circle at 50% 0%, #000 0%, transparent 70%);
  mask-image: radial-gradient(circle at 50% 0%, #000 0%, transparent 70%);
  opacity: 0.5;
  pointer-events: none;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
::selection { background: var(--accent); color: #04130c; }

/* ---------- Layout ---------- */
.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--pad);
}

section { padding-block: clamp(4.5rem, 11vw, 8rem); }

/* ---------- Section label ---------- */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 1.6rem;
}
.eyebrow .num { color: var(--text-dim); }
.eyebrow::after {
  content: "";
  height: 1px;
  flex: 1;
  background: linear-gradient(90deg, var(--line), transparent);
  margin-left: 0.4rem;
}

.section-title {
  font-family: var(--font-disp);
  font-weight: 600;
  font-size: clamp(1.7rem, 4vw, 2.6rem);
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 1.1rem;
}
.section-intro {
  color: var(--text-mut);
  max-width: 60ch;
  font-size: 1.02rem;
}

/* ---------- Header / nav ---------- */
header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem var(--pad);
  background: rgba(10, 12, 15, 0.55);
  -webkit-backdrop-filter: blur(14px) saturate(120%);
  backdrop-filter: blur(14px) saturate(120%);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s, background 0.3s;
}
header.scrolled {
  border-bottom-color: var(--line);
  background: rgba(10, 12, 15, 0.8);
}
.brand {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.brand .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent);
  animation: pulse 2.4s var(--ease) infinite;
}
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:0.35} }
.brand .muted { color: var(--text-dim); }

nav ul { list-style: none; display: flex; align-items: center; gap: 0.35rem; }
nav a {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-mut);
  padding: 0.45rem 0.7rem;
  border-radius: 8px;
  transition: color 0.2s, background 0.2s;
}
nav a:hover { color: var(--text); background: var(--surface); }
nav a.active { color: var(--accent); }
nav a.active::before { content: "› "; color: var(--accent-dim); }

.nav-cta {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  padding: 0.5rem 0.9rem !important;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--text) !important;
  background: var(--surface);
}
.nav-cta:hover { border-color: var(--accent-dim); color: var(--accent) !important; }

#menu {
  display: none;
  background: none;
  border: 1px solid var(--line);
  color: var(--text);
  width: 40px; height: 40px;
  border-radius: 9px;
  font-size: 1.1rem;
  cursor: pointer;
}

/* ---------- Hero ---------- */
.hero {
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding-top: 6rem;
}
.hero .wrap { width: 100%; }

.hero-status {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-mut);
  border: 1px solid var(--line);
  background: var(--surface);
  padding: 0.4rem 0.85rem;
  border-radius: 999px;
  margin-bottom: 2rem;
}
.hero-status .live {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--accent); box-shadow: 0 0 8px var(--accent);
}

.hero h1 {
  font-family: var(--font-disp);
  font-weight: 600;
  font-size: clamp(2.1rem, 7.6vw, 5.5rem);
  line-height: 1.04;
  letter-spacing: -0.04em;
  margin-bottom: 1.5rem;
  overflow-wrap: break-word;
}
.hero h1 .grad {
  background: linear-gradient(120deg, var(--text) 30%, var(--accent));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-lead {
  font-size: clamp(1.05rem, 2.2vw, 1.3rem);
  color: var(--text-mut);
  max-width: 58ch;
  margin-bottom: 2.4rem;
}
.hero-lead .hl { color: var(--text); }

.hero-actions { display: flex; flex-wrap: wrap; gap: 0.9rem; align-items: center; }

/* buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  padding: 0.8rem 1.3rem;
  border-radius: 10px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.2s var(--ease), background 0.2s, border-color 0.2s, color 0.2s, box-shadow 0.2s;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: var(--accent); color: #04130c; font-weight: 600; }
.btn-primary:hover { box-shadow: 0 8px 30px var(--accent-glow); }
.btn-ghost { border-color: var(--line); color: var(--text); background: var(--surface); }
.btn-ghost:hover { border-color: var(--accent-dim); color: var(--accent); }

/* hero socials */
.hero-socials { display: flex; gap: 0.5rem; margin-left: 0.4rem; }
.hero-socials a {
  width: 42px; height: 42px;
  display: grid; place-items: center;
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--text-mut);
  background: var(--surface);
  transition: all 0.2s var(--ease);
}
.hero-socials a:hover { color: var(--accent); border-color: var(--accent-dim); transform: translateY(-2px); }

/* hero stat strip */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  margin-top: 4rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--line);
}
.hero-stats .stat { background: var(--bg-soft); padding: 1.3rem 1.4rem; }
.hero-stats .n {
  font-family: var(--font-disp);
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  font-weight: 600;
  letter-spacing: -0.03em;
}
.hero-stats .n span { color: var(--accent); }
.hero-stats .l {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--text-dim);
  margin-top: 0.2rem;
  letter-spacing: 0.02em;
}

/* ---------- About ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: start;
}
.about-body p { color: var(--text-mut); margin-bottom: 1.1rem; }
.about-body p .hl { color: var(--text); font-weight: 500; }

.about-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  overflow: hidden;
}
.about-card .photo { position: relative; aspect-ratio: 4/5; }
.about-card .photo img { width: 100%; height: 100%; object-fit: cover; filter: grayscale(0.2) contrast(1.02); }
.about-card .photo::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 55%, rgba(10,12,15,0.85));
}
.about-meta { padding: 1.2rem 1.3rem; display: grid; gap: 0.7rem; }
.about-meta .row {
  display: flex; justify-content: space-between; gap: 1rem;
  font-family: var(--font-mono); font-size: 0.82rem;
  padding-bottom: 0.7rem; border-bottom: 1px solid var(--line-soft);
}
.about-meta .row:last-child { border-bottom: none; padding-bottom: 0; }
.about-meta .k { color: var(--text-dim); }
.about-meta .v { color: var(--text); text-align: right; }
.about-meta .v .ok { color: var(--accent); }

/* ---------- Work / case studies ---------- */
.work-list { display: grid; gap: 1.1rem; }

.case {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 1.6rem;
  align-items: start;
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: var(--radius);
  padding: clamp(1.4rem, 3vw, 2.2rem);
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease), background 0.3s;
  position: relative;
  overflow: hidden;
}
.case::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 3px;
  background: var(--accent); transform: scaleY(0); transform-origin: top;
  transition: transform 0.35s var(--ease);
}
.case:hover { border-color: var(--line); background: var(--surface-2); transform: translateY(-3px); }
.case:hover::before { transform: scaleY(1); }

.case-num {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-dim);
  padding-top: 0.35rem;
}
.case-flag {
  display: inline-flex; align-items: center; gap: 0.45rem;
  font-family: var(--font-mono); font-size: 0.72rem;
  color: var(--accent); margin-bottom: 0.7rem;
  text-transform: uppercase; letter-spacing: 0.06em;
}
.case-flag .badge {
  border: 1px solid var(--accent-dim); border-radius: 999px;
  padding: 0.1rem 0.55rem; color: var(--accent);
}
.case h3 {
  font-family: var(--font-disp);
  font-size: clamp(1.25rem, 2.6vw, 1.7rem);
  font-weight: 600; letter-spacing: -0.025em;
  margin-bottom: 0.6rem;
}
.case .role { font-family: var(--font-mono); font-size: 0.8rem; color: var(--text-dim); }
.case p { color: var(--text-mut); margin: 0.8rem 0 1rem; max-width: 62ch; }

.case-metrics { display: flex; flex-wrap: wrap; gap: 1.6rem; margin: 1.1rem 0; }
.case-metrics .m .n {
  font-family: var(--font-disp); font-size: 1.3rem; font-weight: 600; color: var(--text);
}
.case-metrics .m .n span { color: var(--accent); }
.case-metrics .m .l { font-family: var(--font-mono); font-size: 0.72rem; color: var(--text-dim); }

.stack { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-top: 0.4rem; }
.stack span {
  font-family: var(--font-mono); font-size: 0.74rem;
  color: var(--text-mut); border: 1px solid var(--line);
  background: var(--bg-soft); padding: 0.25rem 0.6rem; border-radius: 7px;
}
.case-links { display: flex; flex-direction: column; gap: 0.5rem; align-items: flex-end; }
.case-link {
  font-family: var(--font-mono); font-size: 0.8rem;
  color: var(--text-mut); display: inline-flex; align-items: center; gap: 0.4rem;
  border: 1px solid var(--line); padding: 0.45rem 0.8rem; border-radius: 8px;
  transition: all 0.2s var(--ease); white-space: nowrap;
}
.case-link:hover { color: var(--accent); border-color: var(--accent-dim); }

/* ---------- Experience ---------- */
.timeline { position: relative; display: grid; gap: 0; }
.exp {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 2.5rem;
  padding: 2rem 0;
  border-top: 1px solid var(--line);
}
.exp:last-child { border-bottom: 1px solid var(--line); }
.exp-when { font-family: var(--font-mono); font-size: 0.8rem; color: var(--text-dim); padding-top: 0.25rem; }
.exp-when .now { color: var(--accent); }
.exp-head { display: flex; flex-wrap: wrap; align-items: baseline; gap: 0.6rem 0.9rem; margin-bottom: 0.3rem; }
.exp-head h3 { font-family: var(--font-disp); font-size: 1.3rem; font-weight: 600; letter-spacing: -0.02em; }
.exp-head .at { color: var(--accent); }
.exp-role { font-family: var(--font-mono); font-size: 0.82rem; color: var(--text-mut); margin-bottom: 1rem; }
.exp ul { list-style: none; display: grid; gap: 0.55rem; }
.exp li { color: var(--text-mut); padding-left: 1.3rem; position: relative; font-size: 0.96rem; }
.exp li::before { content: "▸"; position: absolute; left: 0; color: var(--accent-dim); }
.exp .stack { margin-top: 1rem; }

/* ---------- Skills ---------- */
.skill-groups { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1.1rem; }
.skill-card {
  border: 1px solid var(--line); background: var(--surface);
  border-radius: var(--radius); padding: 1.5rem;
  transition: border-color 0.3s, transform 0.3s var(--ease);
}
.skill-card:hover { border-color: var(--accent-dim); transform: translateY(-3px); }
.skill-card h4 {
  font-family: var(--font-mono); font-size: 0.8rem; color: var(--accent);
  text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 1rem;
  display: flex; align-items: center; gap: 0.5rem;
}
.skill-card h4 .i { color: var(--text-dim); }
.skill-card ul { list-style: none; display: flex; flex-wrap: wrap; gap: 0.4rem; }
.skill-card li {
  font-family: var(--font-mono); font-size: 0.8rem; color: var(--text-mut);
  border: 1px solid var(--line-soft); background: var(--bg-soft);
  padding: 0.3rem 0.65rem; border-radius: 7px;
}

/* ---------- Contact ---------- */
.contact-inner {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    radial-gradient(600px 300px at 100% 0%, var(--accent-glow), transparent 60%),
    var(--surface);
  padding: clamp(2rem, 6vw, 4rem);
  text-align: center;
}
.contact-inner .section-title { margin-inline: auto; }
.contact-inner .section-intro { margin: 0 auto 2rem; }
.contact-actions { display: flex; flex-wrap: wrap; gap: 0.9rem; justify-content: center; }

/* ---------- Footer ---------- */
footer {
  border-top: 1px solid var(--line);
  padding: 2.5rem var(--pad);
}
.footer-inner {
  max-width: var(--maxw); margin-inline: auto;
  display: flex; flex-wrap: wrap; gap: 1rem; justify-content: space-between; align-items: center;
}
.footer-inner p { font-family: var(--font-mono); font-size: 0.8rem; color: var(--text-dim); }
.footer-inner .accent { color: var(--accent); }
.footer-social { display: flex; gap: 0.4rem; }
.footer-social a {
  width: 38px; height: 38px; display: grid; place-items: center;
  border: 1px solid var(--line); border-radius: 9px; color: var(--text-mut);
  transition: all 0.2s var(--ease);
}
.footer-social a:hover { color: var(--accent); border-color: var(--accent-dim); }

/* ---------- Scroll-reveal ---------- */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  nav { position: fixed; inset: 64px 1rem auto 1rem; background: var(--surface);
        border: 1px solid var(--line); border-radius: 14px; padding: 0.6rem;
        transform: translateY(-12px); opacity: 0; pointer-events: none; transition: all 0.25s var(--ease); }
  nav.open { transform: none; opacity: 1; pointer-events: auto; }
  nav ul { flex-direction: column; align-items: stretch; gap: 0.15rem; }
  nav a { padding: 0.7rem 0.9rem; }
  .nav-cta { text-align: center; }
  #menu { display: grid; place-items: center; }
  .about-grid { grid-template-columns: 1fr; }
  .about-card { max-width: 360px; }
  .exp { grid-template-columns: 1fr; gap: 0.6rem; }
  .case { grid-template-columns: auto 1fr; }
  .case-links { grid-column: 1 / -1; flex-direction: row; align-items: stretch; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px) {
  .hero { padding-top: 5rem; }
  .hero h1 { font-size: clamp(1.95rem, 8.8vw, 2.6rem); }
  .hero-lead { max-width: 100%; }
  .hero-socials { margin-left: 0; }
  .hero-actions .btn { flex: 1 1 100%; justify-content: center; }
  .hero-actions .hero-socials { flex: 1 1 100%; }
  .case-metrics { gap: 1.1rem 1.6rem; }
  .case-links { flex-wrap: wrap; }
  .skill-groups { grid-template-columns: 1fr; }
}

/* reduced motion */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
}