/* Tanuj Mehta - Portfolio design system */
:root {
  --bg: #070a0f;
  --bg-soft: #0c1118;
  --bg-card: #0f1520;
  --border: rgba(148, 163, 184, 0.14);
  --border-hover: rgba(94, 234, 212, 0.45);
  --text: #e6edf6;
  --text-dim: #94a3b8;
  --text-faint: #64748b;
  --accent: #5eead4;
  --accent-2: #818cf8;
  --accent-3: #f472b6;
  --grad: linear-gradient(100deg, #5eead4 0%, #818cf8 55%, #c084fc 100%);
  --radius: 16px;
  --maxw: 1140px;
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --mono: "SF Mono", ui-monospace, "JetBrains Mono", Menlo, monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16.5px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
::selection { background: rgba(94, 234, 212, 0.25); }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: none; }
img, video { max-width: 100%; display: block; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ambient glow */
.glow {
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background:
    radial-gradient(600px 400px at 85% -5%, rgba(129, 140, 248, 0.13), transparent 65%),
    radial-gradient(700px 500px at -10% 25%, rgba(94, 234, 212, 0.08), transparent 65%),
    radial-gradient(500px 400px at 60% 110%, rgba(192, 132, 252, 0.07), transparent 65%);
}

/* ---------- Nav ---------- */
nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(14px);
  background: rgba(7, 10, 15, 0.72);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 16px 24px;
  display: flex; align-items: center; justify-content: space-between;
}
.logo { font-weight: 800; font-size: 18px; color: var(--text); letter-spacing: -0.3px; }
.logo em { font-style: normal; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.nav-links { display: flex; gap: 26px; align-items: center; }
.nav-links a { color: var(--text-dim); font-size: 14.5px; font-weight: 500; transition: color .2s; }
.nav-links a:hover { color: var(--text); }
.nav-cta {
  padding: 8px 18px; border-radius: 999px; font-weight: 600;
  background: var(--grad); color: #04110d !important; font-size: 14px;
}

/* ---------- Hero ---------- */
.hero { padding: 110px 0 90px; }
.hero-kicker {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13.5px; font-weight: 600; color: var(--accent);
  border: 1px solid rgba(94, 234, 212, 0.3); border-radius: 999px;
  padding: 6px 14px; margin-bottom: 26px; background: rgba(94, 234, 212, 0.06);
}
.hero-kicker .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); animation: pulse 2s infinite; }
@keyframes pulse { 0%,100% { opacity: 1 } 50% { opacity: .35 } }
.hero h1 {
  font-size: clamp(40px, 6.5vw, 68px); line-height: 1.06; font-weight: 800;
  letter-spacing: -2px; margin-bottom: 24px;
}
.hero h1 .grad { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-sub { font-size: clamp(17px, 2vw, 20px); color: var(--text-dim); max-width: 720px; margin-bottom: 38px; }
.hero-sub strong { color: var(--text); font-weight: 600; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; align-items: center; }
.btn {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 13px 26px; border-radius: 12px; font-weight: 650; font-size: 15.5px;
  transition: transform .18s, box-shadow .18s; cursor: pointer;
}
.btn-primary { background: var(--grad); color: #04110d; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 34px rgba(94, 234, 212, 0.22); }
.btn-ghost { border: 1px solid var(--border); color: var(--text); background: rgba(255,255,255,0.02); }
.btn-ghost:hover { border-color: var(--border-hover); transform: translateY(-2px); }

.hero-stats { display: flex; gap: 44px; margin-top: 66px; flex-wrap: wrap; }
.stat .num {
  font-size: 32px; font-weight: 800; letter-spacing: -1px;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.stat .lbl { font-size: 13.5px; color: var(--text-faint); margin-top: 2px; }

/* ---------- Sections ---------- */
section { padding: 84px 0; }
.sec-kicker { font-family: var(--mono); font-size: 13px; color: var(--accent); letter-spacing: 1.5px; text-transform: uppercase; margin-bottom: 12px; }
.sec-title { font-size: clamp(28px, 4vw, 40px); font-weight: 800; letter-spacing: -1.2px; margin-bottom: 14px; }
.sec-sub { color: var(--text-dim); max-width: 640px; margin-bottom: 48px; }

/* ---------- Project cards ---------- */
.proj-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 26px; }
.proj-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; transition: transform .25s, border-color .25s, box-shadow .25s;
  display: flex; flex-direction: column;
}
.proj-card:hover { transform: translateY(-5px); border-color: var(--border-hover); box-shadow: 0 24px 60px rgba(0,0,0,0.45); }
.proj-media { position: relative; aspect-ratio: 16/9; background: #000; overflow: hidden; }
.proj-media video, .proj-media img { width: 100%; height: 100%; object-fit: cover; }
.proj-body { padding: 26px 28px 30px; display: flex; flex-direction: column; gap: 12px; flex: 1; }
.proj-top { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.proj-name { font-size: 21px; font-weight: 750; letter-spacing: -0.4px; color: var(--text); }
.proj-live {
  font-size: 12px; font-weight: 700; color: #34d399; display: inline-flex; align-items: center; gap: 6px;
  border: 1px solid rgba(52, 211, 153, 0.35); padding: 3px 10px; border-radius: 999px; white-space: nowrap;
}
.proj-live::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: #34d399; }
.proj-desc { color: var(--text-dim); font-size: 15px; }
.proj-tags { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 4px; }
.tag {
  font-family: var(--mono); font-size: 12px; color: var(--text-dim);
  background: rgba(148, 163, 184, 0.08); border: 1px solid var(--border);
  padding: 3.5px 10px; border-radius: 7px;
}
.proj-links { margin-top: auto; padding-top: 14px; display: flex; gap: 18px; font-size: 14.5px; font-weight: 600; }
.proj-links a:hover { text-decoration: underline; }

/* ---------- AI toolbox ---------- */
.ai-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.ai-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 26px; transition: border-color .25s, transform .25s;
}
.ai-card:hover { border-color: var(--border-hover); transform: translateY(-3px); }
.ai-card .icon { font-size: 26px; margin-bottom: 14px; }
.ai-card h3 { font-size: 17px; font-weight: 700; margin-bottom: 8px; letter-spacing: -0.3px; }
.ai-card p { font-size: 14.5px; color: var(--text-dim); }

/* ---------- Experience ---------- */
.timeline { border-left: 2px solid rgba(148, 163, 184, 0.18); margin-left: 8px; padding-left: 34px; display: flex; flex-direction: column; gap: 44px; }
.tl-item { position: relative; }
.tl-item::before {
  content: ""; position: absolute; left: -41px; top: 7px; width: 12px; height: 12px; border-radius: 50%;
  background: var(--accent); box-shadow: 0 0 0 5px rgba(94, 234, 212, 0.12);
}
.tl-role { font-size: 19px; font-weight: 750; letter-spacing: -0.3px; }
.tl-org { color: var(--accent); font-weight: 600; font-size: 15px; }
.tl-date { font-family: var(--mono); font-size: 12.5px; color: var(--text-faint); margin: 3px 0 12px; }
.tl-item ul { list-style: none; display: flex; flex-direction: column; gap: 9px; }
.tl-item li { color: var(--text-dim); font-size: 15px; padding-left: 20px; position: relative; }
.tl-item li::before { content: "▹"; position: absolute; left: 0; color: var(--accent); }
.tl-item li strong { color: var(--text); font-weight: 600; }

/* ---------- Skills ---------- */
.skill-groups { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.skill-group { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px 26px; }
.skill-group h3 { font-size: 15px; font-weight: 700; margin-bottom: 14px; color: var(--accent); letter-spacing: 0.2px; }
.skill-group .tags { display: flex; flex-wrap: wrap; gap: 8px; }

/* ---------- Contact ---------- */
.contact-box {
  background: linear-gradient(140deg, rgba(94,234,212,0.07), rgba(129,140,248,0.07));
  border: 1px solid var(--border); border-radius: 22px; padding: 60px 48px; text-align: center;
}
.contact-box h2 { font-size: clamp(26px, 4vw, 38px); font-weight: 800; letter-spacing: -1px; margin-bottom: 14px; }
.contact-box p { color: var(--text-dim); max-width: 520px; margin: 0 auto 32px; }
.contact-links { display: flex; gap: 22px; justify-content: center; flex-wrap: wrap; margin-top: 28px; font-size: 14.5px; font-weight: 600; }

footer { border-top: 1px solid var(--border); padding: 30px 0 40px; color: var(--text-faint); font-size: 13.5px; }
.foot-inner { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }

/* ---------- Case study pages ---------- */
.case-hero { padding: 80px 0 40px; }
.case-hero .back { font-size: 14px; color: var(--text-faint); display: inline-block; margin-bottom: 28px; }
.case-hero .back:hover { color: var(--accent); }
.case-hero h1 { font-size: clamp(34px, 5vw, 54px); font-weight: 800; letter-spacing: -1.6px; margin-bottom: 16px; }
.case-hero .tagline { font-size: 19px; color: var(--text-dim); max-width: 760px; }
.case-meta { display: flex; gap: 30px; flex-wrap: wrap; margin-top: 30px; font-size: 14px; }
.case-meta .m .k { color: var(--text-faint); font-family: var(--mono); font-size: 12px; text-transform: uppercase; letter-spacing: 1px; }
.case-meta .m .v { color: var(--text); font-weight: 600; margin-top: 2px; }
.case-video { border-radius: var(--radius); overflow: hidden; border: 1px solid var(--border); margin: 30px 0 10px; background: #000; }
.case-section { padding: 46px 0; }
.case-section h2 { font-size: 26px; font-weight: 750; letter-spacing: -0.6px; margin-bottom: 20px; }
.case-section h2::before { content: "// "; color: var(--accent); font-family: var(--mono); font-size: 20px; }
.case-section p { color: var(--text-dim); margin-bottom: 16px; max-width: 820px; }
.case-section p strong { color: var(--text); }
.feature-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin-top: 8px; }
.feature {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 12px; padding: 18px 20px;
}
.feature h4 { font-size: 15.5px; font-weight: 700; margin-bottom: 6px; }
.feature p { font-size: 14px; color: var(--text-dim); margin: 0; }
.arch-figure {
  background: var(--bg-soft); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 30px; margin: 10px 0 16px; overflow-x: auto;
}
.arch-figure svg { width: 100%; height: auto; min-width: 620px; }
.challenge { border-left: 3px solid var(--accent-2); padding: 4px 0 4px 22px; margin-bottom: 26px; }
.challenge h4 { font-size: 16.5px; font-weight: 700; margin-bottom: 6px; }
.challenge .sol { color: var(--text-dim); font-size: 15px; }
.challenge .sol strong { color: var(--text); }
.metric-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 10px; }
.metric { background: var(--bg-card); border: 1px solid var(--border); border-radius: 12px; padding: 20px; text-align: center; }
.metric .num { font-size: 26px; font-weight: 800; letter-spacing: -1px; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.metric .lbl { font-size: 12.5px; color: var(--text-faint); margin-top: 4px; }
.case-nav { display: flex; justify-content: space-between; gap: 16px; padding: 40px 0 80px; flex-wrap: wrap; }

/* SVG diagram shared styles */
.arch-figure text { font-family: var(--mono); fill: var(--text); }
.arch-figure .box { fill: #131b29; stroke: rgba(148,163,184,0.35); rx: 10; }
.arch-figure .box-accent { fill: rgba(94,234,212,0.09); stroke: rgba(94,234,212,0.55); rx: 10; }
.arch-figure .box-purple { fill: rgba(129,140,248,0.10); stroke: rgba(129,140,248,0.55); rx: 10; }
.arch-figure .lbl { font-size: 13px; font-weight: 600; }
.arch-figure .sub { font-size: 10.5px; fill: var(--text-faint); }
.arch-figure .flow { stroke: rgba(148,163,184,0.5); stroke-width: 1.6; fill: none; marker-end: url(#arr); }
.arch-figure .grp { fill: none; stroke: rgba(148,163,184,0.16); stroke-dasharray: 5 5; rx: 14; }
.arch-figure .grp-lbl { font-size: 11px; fill: var(--text-faint); letter-spacing: 1px; }

/* ---------- Reveal animations (only when JS is running) ---------- */
html.js .reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
html.js .reveal.on { opacity: 1; transform: none; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .proj-grid, .skill-groups { grid-template-columns: 1fr; }
  .ai-grid { grid-template-columns: 1fr 1fr; }
  .feature-grid { grid-template-columns: 1fr; }
  .metric-row { grid-template-columns: 1fr 1fr; }
  .nav-links a:not(.nav-cta) { display: none; }
  .hero { padding: 70px 0 60px; }
  .hero-stats { gap: 28px; }
  .contact-box { padding: 44px 26px; }
}