/* =========================================================
   Aayush Agarwal — portfolio stylesheet
   Design tokens: control-tower navy + amber beacon + teal telemetry
   ========================================================= */

:root{
  --bg:#0b1220;
  --bg-soft:#0e1626;
  --surface:#111b2e;
  --surface-2:#16223a;
  --text:#e7ecf6;
  --muted:#8697b8;
  --muted-2:#5f6f8f;
  --amber:#f2a93b;
  --amber-dim:#c9862a;
  --teal:#3fd8c2;
  --line:rgba(230,236,246,.09);
  --line-strong:rgba(230,236,246,.16);
  --radius-s:10px;
  --radius-m:16px;
  --radius-l:24px;
  --container:1180px;
  --font-display:'Space Grotesk',system-ui,sans-serif;
  --font-body:'IBM Plex Sans',system-ui,-apple-system,Segoe UI,Arial,sans-serif;
  --font-mono:'IBM Plex Mono',ui-monospace,Menlo,Consolas,monospace;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;overflow-x:hidden}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:var(--font-body);
  line-height:1.6;
  overflow-x:hidden;
  overscroll-behavior-y:none;
  -webkit-tap-highlight-color:transparent;
}
img,svg,canvas,video{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul{margin:0;padding:0;list-style:none}
button{font:inherit;color:inherit;background:none;border:none;cursor:pointer}

.container{width:100%;max-width:var(--container);margin-inline:auto;padding-inline:clamp(16px,4vw,48px)}

.skip-link{position:absolute;left:-999px;top:0;background:var(--amber);color:#141014;padding:10px 16px;border-radius:0 0 8px 0;z-index:1000}
.skip-link:focus{left:0}

/* ============ NAV ============ */
.nav{
  position:fixed;inset:0 0 auto 0;z-index:100;
  display:flex;align-items:center;justify-content:space-between;
  padding:clamp(12px,3vw,18px) clamp(16px,4vw,48px);
  background:rgba(11,18,32,.55);
  backdrop-filter:blur(14px) saturate(140%);
  -webkit-backdrop-filter:blur(14px) saturate(140%);
  border-bottom:1px solid var(--line);
}
.nav-mark{font-family:var(--font-display);font-weight:700;font-size:1.15rem;letter-spacing:.02em;display:inline-flex;align-items:center;gap:8px;min-height:48px}
.nav-mark-dot{width:7px;height:7px;border-radius:50%;background:var(--teal);box-shadow:0 0 10px var(--teal)}
.nav-menu{display:flex;align-items:center;gap:clamp(14px,2.4vw,30px);font-size:.92rem;color:var(--muted)}
.nav-menu a{padding:12px 4px;min-height:48px;display:inline-flex;align-items:center;transition:color .2s}
.nav-menu a:hover,.nav-menu a:focus-visible{color:var(--text)}
.nav-cta{color:var(--bg) !important;background:var(--amber);border-radius:999px;padding:10px 18px !important;font-weight:600}
.nav-toggle{display:none;flex-direction:column;gap:5px;width:48px;height:48px;align-items:center;justify-content:center}
.nav-toggle span{width:22px;height:2px;background:var(--text);border-radius:2px;transition:transform .25s,opacity .25s}

@media (max-width:860px){
  .nav-toggle{display:flex}
  .nav-menu{
    position:fixed;top:0;right:0;height:100svh;width:min(78vw,320px);
    flex-direction:column;align-items:flex-start;justify-content:center;gap:22px;
    background:rgba(14,22,38,.92);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);
    border-left:1px solid var(--line-strong);
    padding:32px clamp(24px,6vw,40px);
    transform:translateX(100%);transition:transform .35s ease;
  }
  .nav-menu.open{transform:translateX(0)}
  .nav-menu a{font-size:1.1rem;width:100%}
  .nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  .nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
  .nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
}

/* ============ HERO ============ */
.hero{
  min-height:100svh;
  display:flex;align-items:center;position:relative;
  padding:calc(72px + 4vh) clamp(16px,4vw,48px) 6vh;
  isolation:isolate;
}
.hero-canvas-wrap{
  position:absolute;inset:0;overflow:hidden;
  background:
    radial-gradient(60% 55% at 78% 32%, rgba(63,216,194,.10), transparent 60%),
    radial-gradient(50% 45% at 15% 80%, rgba(242,169,59,.08), transparent 60%),
    var(--bg);
  z-index:-1;
}
#bgCanvas{position:absolute;inset:0;width:100%;height:100%;opacity:.7}

.radar{
  position:absolute;
  right:clamp(-180px,-4vw,-40px);
  top:50%;transform:translateY(-50%);
  width:min(74vw,760px);height:auto;
  opacity:.9;
}
.radar-rings circle{fill:none;stroke:var(--line-strong);stroke-width:1}
.radar-sweep-wrap{transform-origin:320px 320px;animation:sweep 7s linear infinite}
.radar-sweep{fill:url(#sweepGrad);opacity:.55}
.radar-hub circle{fill:var(--surface-2);stroke:var(--amber);stroke-width:2}
.radar-hub text{fill:var(--amber);font-family:var(--font-mono);font-size:22px;font-weight:600}
.radar-node-dot{fill:var(--teal);filter:drop-shadow(0 0 6px rgba(63,216,194,.8))}
.radar-node-ping{fill:none;stroke:var(--teal);stroke-width:1.4;transform-origin:center;animation:ping 2.6s ease-out infinite}
.radar-node-label{fill:var(--muted);font-family:var(--font-mono);font-size:12px}
.radar-link{stroke:var(--line-strong);stroke-width:1;stroke-dasharray:3 5}

@keyframes sweep{from{transform:rotate(0)}to{transform:rotate(360deg)}}
@keyframes ping{0%{opacity:.9;transform:scale(.3)}100%{opacity:0;transform:scale(2.6)}}

.hero-content{position:relative;max-width:760px}
.eyebrow{
  font-family:var(--font-mono);text-transform:uppercase;letter-spacing:.12em;
  font-size:.78rem;color:var(--teal);margin:0 0 1.1em;display:flex;align-items:center;gap:8px;
}
.eyebrow::before{content:"";width:16px;height:1px;background:var(--teal)}

.hero h1{
  font-family:var(--font-display);font-weight:600;
  font-size:clamp(2.2rem,6.4vw,4.8rem);line-height:1.03;letter-spacing:-.01em;
  margin:0 0 .35em;
}
.hero-role{
  font-family:var(--font-display);font-weight:500;
  font-size:clamp(1.05rem,2.4vw,1.5rem);color:var(--amber);margin:0 0 .8em;
}
.hero-sub{max-width:56ch;color:var(--muted);font-size:clamp(.98rem,1.6vw,1.12rem);margin:0 0 2em}

.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-bottom:2.6em}
.btn{
  min-height:48px;display:inline-flex;align-items:center;justify-content:center;
  padding:12px 26px;border-radius:999px;font-weight:600;font-size:.96rem;
  transition:transform .2s,box-shadow .2s,background .2s,border-color .2s;
}
.btn-primary{background:var(--amber);color:#14100a}
.btn-primary:hover,.btn-primary:focus-visible{transform:translateY(-2px);box-shadow:0 10px 26px -8px rgba(242,169,59,.55)}
.btn-ghost{border:1px solid var(--line-strong);color:var(--text);background:rgba(255,255,255,.02)}
.btn-ghost:hover,.btn-ghost:focus-visible{border-color:var(--teal);color:var(--teal)}

.hero-stats{display:flex;flex-wrap:wrap;gap:clamp(20px,4vw,44px);margin:0}
.hero-stats div{display:flex;flex-direction:column;gap:2px}
.hero-stats dt{font-family:var(--font-mono);font-size:clamp(1.4rem,3vw,1.9rem);color:var(--teal);font-weight:500}
.hero-stats dd{margin:0;font-size:.82rem;color:var(--muted);max-width:14ch}

.scroll-cue{
  position:absolute;left:clamp(16px,4vw,48px);bottom:22px;
  display:flex;align-items:center;gap:10px;font-family:var(--font-mono);
  font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;color:var(--muted-2);
}
.scroll-cue span{width:1px;height:26px;background:linear-gradient(var(--teal),transparent);animation:cue 1.8s ease-in-out infinite}
@keyframes cue{0%,100%{transform:translateY(0);opacity:.4}50%{transform:translateY(6px);opacity:1}}

/* ============ SECTIONS ============ */
.section{padding:clamp(64px,10vw,120px) 0}
.section-dark{background:var(--bg-soft);border-block:1px solid var(--line)}
.section-title{
  font-family:var(--font-display);font-weight:600;
  font-size:clamp(1.6rem,3.6vw,2.6rem);line-height:1.14;letter-spacing:-.01em;
  max-width:24ch;margin:0 0 .6em;
}
.section-lead{color:var(--muted);max-width:60ch;font-size:clamp(.98rem,1.5vw,1.08rem);margin:0 0 2.2em}

/* ---- about ---- */
.about-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:clamp(28px,5vw,60px);align-items:start;margin-top:1.4em}
.about-lead{font-size:clamp(1.02rem,1.7vw,1.2rem);color:var(--text);max-width:60ch}
.about-facts{display:flex;flex-direction:column;gap:18px}
.fact{
  display:flex;flex-direction:column;gap:4px;
  padding:16px 18px;border:1px solid var(--line);border-radius:var(--radius-m);
  background:rgba(255,255,255,.02);
}
.fact-label{font-family:var(--font-mono);font-size:.72rem;text-transform:uppercase;letter-spacing:.08em;color:var(--amber)}
@media (max-width:860px){.about-grid{grid-template-columns:1fr}}

/* ---- impact stats ---- */
.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--radius-l);overflow:hidden;margin-top:1.4em}
.stat-card{background:var(--bg-soft);padding:clamp(20px,3vw,30px) clamp(18px,2.4vw,26px);display:flex;flex-direction:column;gap:.4em;min-height:172px}
.stat-num{font-family:var(--font-mono);font-size:clamp(2.1rem,4.2vw,2.8rem);color:var(--teal);font-weight:500;display:inline}
.stat-suffix{font-family:var(--font-mono);font-size:clamp(1.2rem,2vw,1.6rem);color:var(--teal);margin-left:2px}
.stat-card p{margin:auto 0 0;color:var(--muted);font-size:.92rem;max-width:26ch}
@media (max-width:980px){.stat-grid{grid-template-columns:repeat(2,1fr)}}
@media (max-width:520px){.stat-grid{grid-template-columns:1fr}}

/* ---- flight path roadmap ---- */
.flightpath{position:relative;margin-top:2em;padding-left:clamp(28px,5vw,52px)}
.flightpath::before{
  content:"";position:absolute;left:9px;top:6px;bottom:6px;width:1px;
  background:linear-gradient(var(--teal),var(--line-strong) 85%);
}
.waypoint{position:relative;padding-bottom:clamp(30px,5vw,52px)}
.waypoint:last-child{padding-bottom:0}
.waypoint-marker{position:absolute;left:calc(-1 * clamp(28px,5vw,52px));top:4px;width:20px;height:20px;display:flex;align-items:center;justify-content:center}
.waypoint-dot{width:11px;height:11px;border-radius:50%;background:var(--bg-soft);border:2px solid var(--teal);box-shadow:0 0 0 4px var(--bg)}
.waypoint-card{
  background:rgba(255,255,255,.025);border:1px solid var(--line);border-radius:var(--radius-l);
  padding:clamp(20px,3vw,30px) clamp(20px,3.4vw,34px);
}
.waypoint-head{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-bottom:.6em}
.waypoint-tag{font-family:var(--font-mono);font-size:.7rem;text-transform:uppercase;letter-spacing:.08em;padding:4px 10px;border-radius:999px;border:1px solid var(--line-strong);color:var(--muted)}
.waypoint-tag-current{color:var(--bg);background:var(--teal);border-color:var(--teal)}
.waypoint-date{font-family:var(--font-mono);font-size:.82rem;color:var(--muted)}
.waypoint-card h3{font-family:var(--font-display);font-size:clamp(1.15rem,2.2vw,1.5rem);margin:0 0 .2em;font-weight:600}
.waypoint-card h3 span{color:var(--muted);font-weight:400;font-size:.75em}
.waypoint-role{color:var(--amber);font-weight:500;margin:0 0 .2em}
.waypoint-growth{color:var(--muted-2);font-size:.86rem;margin:0 0 .9em;font-style:italic}
.waypoint-card ul{margin-top:.8em;display:flex;flex-direction:column;gap:.55em}
.waypoint-card li{position:relative;padding-left:1.3em;color:var(--muted);font-size:.96rem}
.waypoint-card li::before{content:"";position:absolute;left:0;top:.55em;width:6px;height:1px;background:var(--teal)}

/* ---- competencies ---- */
.comp-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:1.4em}
.comp-card{
  padding:clamp(20px,2.6vw,26px);border-radius:var(--radius-m);
  border:1px solid var(--line);background:rgba(255,255,255,.02);
  transition:border-color .25s,transform .25s;
}
.comp-card:hover{border-color:var(--teal)}
.comp-card h3{font-family:var(--font-display);font-size:1.05rem;margin:0 0 .6em;color:var(--text)}
.comp-tags{color:var(--muted);font-size:.9rem;line-height:1.7;margin:0}
@media (max-width:980px){.comp-grid{grid-template-columns:repeat(2,1fr)}}
@media (max-width:600px){.comp-grid{grid-template-columns:1fr}}

/* ---- credentials ---- */
.cred-columns{display:grid;grid-template-columns:1fr 1.3fr;gap:clamp(28px,5vw,60px);margin-top:1.4em}
.cred-heading{font-family:var(--font-display);font-size:1.05rem;color:var(--amber);margin:0 0 .8em;font-weight:600}
.cred-list{display:flex;flex-direction:column;gap:.7em}
.cred-list li{padding-left:1.2em;position:relative;color:var(--muted);font-size:.96rem}
.cred-list li::before{content:"";position:absolute;left:0;top:.55em;width:6px;height:1px;background:var(--amber)}
.cred-list-grid{display:grid;grid-template-columns:1fr 1fr;gap:.7em 1.4em}
@media (max-width:860px){.cred-columns{grid-template-columns:1fr}.cred-list-grid{grid-template-columns:1fr}}

.domain-tags{margin-top:clamp(36px,5vw,56px)}
.tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
.tag-cloud span{
  font-size:.84rem;color:var(--muted);padding:8px 14px;border-radius:999px;
  border:1px solid var(--line);background:rgba(255,255,255,.02);
}

/* ---- contact ---- */
.section-contact{background:linear-gradient(180deg,var(--bg),var(--bg-soft))}
.contact-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:1.6em}
.contact-card{
  min-height:96px;display:flex;flex-direction:column;justify-content:center;gap:6px;
  padding:18px 20px;border-radius:var(--radius-m);border:1px solid var(--line);
  background:rgba(255,255,255,.02);backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);
  transition:border-color .25s,transform .25s;
}
.contact-card:not(.contact-card-static):hover{border-color:var(--amber);transform:translateY(-3px)}
.contact-label{font-family:var(--font-mono);font-size:.7rem;text-transform:uppercase;letter-spacing:.08em;color:var(--muted-2)}
.contact-value{font-size:.98rem;word-break:break-word}
@media (max-width:900px){.contact-grid{grid-template-columns:repeat(2,1fr)}}
@media (max-width:520px){.contact-grid{grid-template-columns:1fr}}

/* ---- footer ---- */
.footer{border-top:1px solid var(--line);padding:26px 0}
.footer-inner{display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px;font-size:.84rem;color:var(--muted-2)}

/* ---- reveal-on-scroll base state (JS adds .is-visible) ---- */
[data-reveal]{opacity:1;transform:none}
.js-anim [data-reveal]{opacity:0;transform:translateY(22px);transition:opacity .7s ease,transform .7s ease}
.js-anim [data-reveal].is-visible{opacity:1;transform:none}

/* ---- error fallback ---- */
.error-fallback{position:fixed;inset:0;z-index:9999;align-items:center;justify-content:center;background:var(--bg);padding:24px;text-align:center}
.error-fallback[hidden]{display:none}
.error-fallback:not([hidden]){display:flex}
.error-fallback-inner{max-width:520px}
.error-fallback h2{font-family:var(--font-display);font-size:1.4rem;margin:.4em 0}

/* ---- reduced motion & low-tier device ---- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .radar-sweep-wrap,.radar-node-ping,.scroll-cue span{animation:none !important}
  .js-anim [data-reveal]{opacity:1;transform:none;transition:none}
}
body.low-tier .radar-sweep-wrap{animation-duration:0s}
body.low-tier #bgCanvas{display:none}

/* ---- focus visibility ---- */
a:focus-visible,button:focus-visible{outline:2px solid var(--teal);outline-offset:3px;border-radius:4px}