/* ============================================================
   Nexus Project – app.css
   A self-contained static site stylesheet
   ============================================================ */

/* ---------- Reset & Base ---------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Space+Mono:wght@400;700&display=swap');

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

:root{
  --bg:       #0a0d14;
  --bg-card:  #0f1219;
  --fg:       #dce3ed;
  --fg-muted: #6b7a90;
  --primary:  #3fb5a5;
  --primary-fg:#0a0d14;
  --secondary:#181c25;
  --border:   #1c2130;
  --radius:   0.75rem;
  --font-sans:'Inter',system-ui,-apple-system,sans-serif;
  --font-mono:'Space Mono','Courier New',monospace;
}

html{scroll-behavior:smooth}
body{
  font-family:var(--font-sans);
  background:var(--bg);
  color:var(--fg);
  line-height:1.6;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}

a{color:inherit;text-decoration:none}
button{font:inherit;cursor:pointer;border:none;background:none;color:inherit}
img{max-width:100%;display:block}

/* ---------- Utility ---------- */
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}
.text-balance{text-wrap:balance}
.font-mono{font-family:var(--font-mono)}

/* ---------- Particle Canvas ---------- */
#particle-canvas{
  position:fixed;inset:0;z-index:0;pointer-events:none;
}

/* ---------- Navigation ---------- */
.site-nav{
  position:fixed;top:0;left:0;right:0;z-index:50;
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
  background:rgba(10,13,20,.7);
  border-bottom:1px solid var(--border);
}
.site-nav .inner{
  max-width:72rem;margin:0 auto;
  display:flex;align-items:center;justify-content:space-between;
  padding:1rem 1.5rem;
}
.site-nav .logo{font-size:1.125rem;font-weight:600;letter-spacing:-.02em;transition:color .3s}
.site-nav .logo:hover{color:var(--primary)}
.site-nav .logo .brace{color:var(--primary);font-family:var(--font-mono)}

.nav-links{display:flex;gap:2rem;align-items:center}
.nav-link{
  position:relative;font-size:.875rem;letter-spacing:.04em;
  color:var(--fg-muted);transition:color .3s;padding-bottom:2px;
}
.nav-link::after{
  content:'';position:absolute;bottom:0;left:0;width:0;height:1px;
  background:var(--primary);transition:width .3s cubic-bezier(.22,1,.36,1);
}
.nav-link:hover,.nav-link.active{color:var(--fg)}
.nav-link:hover::after,.nav-link.active::after{width:100%}

/* Mobile nav */
.mobile-toggle{display:none;color:var(--fg-muted);transition:color .3s}
.mobile-toggle:hover{color:var(--fg)}
.mobile-menu{
  display:none;flex-direction:column;gap:.25rem;
  padding:.75rem 1.5rem 1rem;
  border-bottom:1px solid var(--border);
  background:rgba(10,13,20,.95);backdrop-filter:blur(12px);
}
.mobile-menu.open{display:flex}
.mobile-menu button{
  text-align:left;padding:.5rem .75rem;border-radius:.5rem;
  font-size:.875rem;color:var(--fg-muted);transition:all .3s;
}
.mobile-menu button:hover,.mobile-menu button.active{background:var(--secondary);color:var(--fg)}

@media(max-width:768px){
  .nav-links{display:none}
  .mobile-toggle{display:block}
}

/* ---------- Page Transitions ---------- */
.page{display:none}
.page.active{display:block;animation:pageIn .5s cubic-bezier(.22,1,.36,1) forwards}
@keyframes pageIn{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}

/* ---------- Stagger children ---------- */
.stagger>*{opacity:0;animation:fadeUp .6s cubic-bezier(.22,1,.36,1) forwards}
.stagger>*:nth-child(1){animation-delay:.1s}
.stagger>*:nth-child(2){animation-delay:.2s}
.stagger>*:nth-child(3){animation-delay:.3s}
.stagger>*:nth-child(4){animation-delay:.4s}
.stagger>*:nth-child(5){animation-delay:.5s}
@keyframes fadeUp{from{opacity:0;transform:translateY(24px)}to{opacity:1;transform:translateY(0)}}

/* ---------- Scroll Reveal ---------- */
.reveal{opacity:0;transform:translateY(30px);transition:all .7s cubic-bezier(.22,1,.36,1)}
.reveal.visible{opacity:1;transform:translateY(0)}

/* ---------- Section Wrapper ---------- */
.section{position:relative;z-index:10;min-height:100vh;padding:7rem 1.5rem 5rem}
.section .wrap{max-width:60rem;margin:0 auto}

/* ---------- Page Title ---------- */
.page-label{
  margin-bottom:.5rem;font-size:.75rem;font-weight:500;
  letter-spacing:.12em;text-transform:uppercase;
  color:var(--primary);font-family:var(--font-mono);
}
.page-title{
  font-size:clamp(1.75rem,5vw,3rem);font-weight:700;
  letter-spacing:-.02em;color:var(--fg);margin-bottom:3rem;
}

/* ---------- Card ---------- */
.card{
  border-radius:var(--radius);border:1px solid var(--border);
  background:var(--bg-card);padding:2rem 2.5rem;
  transition:border-color .5s,box-shadow .5s;
}
.card:hover{border-color:rgba(63,181,165,.2);box-shadow:0 8px 30px rgba(63,181,165,.05)}
.card-icon{
  width:2.5rem;height:2.5rem;border-radius:.5rem;
  display:flex;align-items:center;justify-content:center;
  background:rgba(63,181,165,.1);color:var(--primary);
  transition:background .3s;
}
.card:hover .card-icon{background:rgba(63,181,165,.2)}
.card-header{display:flex;align-items:center;gap:.75rem;margin-bottom:1rem}
.card-heading{font-size:1.25rem;font-weight:600;color:var(--fg)}
.card p{color:var(--fg-muted);line-height:1.7}

/* ---------- Home Hero ---------- */
.hero{
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  min-height:100vh;padding:2rem 1.5rem;text-align:center;position:relative;z-index:10;
}
.badge{
  display:inline-flex;align-items:center;gap:.5rem;
  border-radius:9999px;border:1px solid var(--border);
  background:rgba(24,28,37,.5);padding:.375rem 1rem;
  font-size:.75rem;letter-spacing:.1em;text-transform:uppercase;
  color:var(--fg-muted);margin-bottom:2rem;
}
.badge svg{color:var(--primary)}
.hero h1{
  font-size:clamp(2rem,6vw,4.25rem);font-weight:700;
  line-height:1.1;letter-spacing:-.03em;
  color:var(--fg);margin-bottom:1.5rem;
}
.hero h1 .accent{color:var(--primary);position:relative;display:inline-block;margin:0 .2em}
.hero h1 .accent::after{
  content:'';position:absolute;bottom:-.125rem;left:0;width:100%;
  height:1px;background:rgba(63,181,165,.4);
}
.hero .subtitle{
  max-width:36rem;margin:0 auto 3rem;font-size:clamp(.9375rem,2vw,1.125rem);
  color:var(--fg-muted);line-height:1.7;
}
.hero .cta-row{display:flex;gap:1rem;flex-wrap:wrap;justify-content:center}
.btn{
  display:inline-flex;align-items:center;gap:.5rem;
  padding:.75rem 1.5rem;border-radius:.5rem;
  font-size:.875rem;font-weight:500;
  transition:all .3s;
}
.btn-primary{
  background:var(--primary);color:var(--primary-fg);
}
.btn-primary:hover{
  box-shadow:0 8px 24px rgba(63,181,165,.2);transform:translateY(-2px);
}
.btn-outline{
  border:1px solid var(--border);background:rgba(24,28,37,.5);color:var(--fg);
}
.btn-outline:hover{
  border-color:rgba(63,181,165,.3);background:var(--secondary);transform:translateY(-2px);
}
.btn .arrow{transition:transform .3s}
.btn:hover .arrow{transform:translateX(4px)}
.scroll-hint{
  position:absolute;bottom:2rem;left:50%;transform:translateX(-50%);
  display:flex;flex-direction:column;align-items:center;gap:.5rem;
}
.scroll-hint span{font-size:.6875rem;letter-spacing:.12em;text-transform:uppercase;color:rgba(107,122,144,.6)}
.scroll-hint .bar{width:1px;height:2rem;background:rgba(63,181,165,.3);animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:.3}50%{opacity:1}}

/* ---------- Video Card ---------- */
.video-card{
  border-radius:var(--radius);border:1px solid var(--border);
  background:var(--bg-card);overflow:hidden;
  transition:border-color .5s,box-shadow .5s;
}
.video-card:hover{border-color:rgba(63,181,165,.2);box-shadow:0 8px 30px rgba(63,181,165,.05)}
.video-area{
  position:relative;padding-top:56.25%;background:var(--secondary);
}
.video-area::before{
  content:'';position:absolute;inset:0;
  background:radial-gradient(circle at center,rgba(63,181,165,.05) 0%,transparent 70%);
}
.video-area .play-wrap{
  position:absolute;inset:0;display:flex;flex-direction:column;
  align-items:center;justify-content:center;gap:1rem;
}
.play-btn{
  width:4rem;height:4rem;border-radius:50%;
  border:1px solid rgba(63,181,165,.3);
  background:rgba(63,181,165,.1);color:var(--primary);
  display:flex;align-items:center;justify-content:center;
  transition:all .3s;
}
.play-btn:hover{background:rgba(63,181,165,.2);transform:scale(1.1);box-shadow:0 8px 24px rgba(63,181,165,.2)}
.play-btn svg{margin-left:3px}
.video-label{font-size:.875rem;color:var(--fg-muted)}
.video-header{
  border-bottom:1px solid var(--border);background:rgba(24,28,37,.3);
  padding:1rem 1.5rem;text-align:center;
}
.video-header h3{font-size:1.125rem;font-weight:600;color:var(--fg)}
.video-header p{font-size:.875rem;color:var(--fg-muted);margin-top:.25rem}

/* ---------- Stats ---------- */
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem;margin-top:1.5rem}
.stat-box{
  border-radius:.5rem;border:1px solid var(--border);
  background:rgba(24,28,37,.5);padding:1rem;text-align:center;
  transition:all .3s;
}
.stat-box:hover{border-color:rgba(63,181,165,.2);background:var(--secondary)}
.stat-val{font-size:1.5rem;font-weight:700;color:var(--primary);font-family:var(--font-mono)}
.stat-label{font-size:.6875rem;color:var(--fg-muted);margin-top:.25rem}

@media(max-width:640px){
  .stats{grid-template-columns:1fr}
}

/* ---------- Team Scroll ---------- */
.team-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:1.5rem}
.team-header .left{display:flex;align-items:center;gap:.75rem}
.team-header h3{font-size:1.25rem;font-weight:600;color:var(--fg)}
.team-arrows{display:flex;gap:.5rem}
.team-arrows button{
  width:2rem;height:2rem;border-radius:.375rem;
  border:1px solid var(--border);background:rgba(24,28,37,.5);
  color:var(--fg-muted);display:flex;align-items:center;justify-content:center;
  transition:all .3s;
}
.team-arrows button:hover{border-color:rgba(63,181,165,.3);color:var(--fg)}

.team-scroll{
  display:flex;gap:1.5rem;overflow-x:auto;
  scroll-snap-type:x mandatory;-webkit-overflow-scrolling:touch;
  scrollbar-width:thin;scrollbar-color:rgba(63,181,165,.3) transparent;
  padding-bottom:1rem;
}
.team-scroll::-webkit-scrollbar{height:4px}
.team-scroll::-webkit-scrollbar-track{background:transparent}
.team-scroll::-webkit-scrollbar-thumb{background:rgba(63,181,165,.3);border-radius:4px}
.team-scroll::-webkit-scrollbar-thumb:hover{background:rgba(63,181,165,.5)}

.member-card{
  min-width:16.25rem;max-width:16.25rem;scroll-snap-align:start;
  border-radius:var(--radius);border:1px solid var(--border);
  background:var(--bg-card);padding:1.5rem;
  transition:all .5s;flex-shrink:0;
}
.member-card:hover{
  border-color:rgba(63,181,165,.2);
  box-shadow:0 8px 30px rgba(63,181,165,.05);
  transform:translateY(-4px);
}
.member-avatar{
  width:5rem;height:5rem;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  margin-bottom:1rem;border:1px solid var(--border);
  transition:border-color .3s;
}
.member-card:hover .member-avatar{border-color:rgba(63,181,165,.3)}
.member-avatar span{font-size:1.125rem;font-weight:600;color:var(--primary)}
.member-card h4{font-size:1rem;font-weight:600;color:var(--fg)}
.member-card .role{
  font-size:.75rem;font-weight:500;color:var(--primary);
  font-family:var(--font-mono);margin-bottom:.75rem;
}
.member-card .desc{font-size:.875rem;color:var(--fg-muted);line-height:1.6}

/* avatar color variants */
.avatar-a{background:linear-gradient(135deg,rgba(63,181,165,.2),rgba(63,181,165,.05))}
.avatar-b{background:linear-gradient(135deg,rgba(45,170,140,.2),rgba(45,170,140,.05))}

/* ---------- Tech Tags ---------- */
.tech-tags{display:flex;flex-wrap:wrap;gap:.75rem}
.tech-tag{
  display:inline-flex;align-items:center;gap:.5rem;
  border-radius:.5rem;border:1px solid var(--border);
  background:rgba(24,28,37,.5);padding:.625rem 1rem;
  transition:all .3s;cursor:default;
}
.tech-tag:hover{
  border-color:rgba(63,181,165,.3);background:var(--secondary);
  transform:translateY(-2px);
}
.tech-tag .name{font-size:.875rem;font-weight:500;color:var(--fg)}
.tech-tag .cat{
  font-size:.625rem;font-weight:500;color:var(--fg-muted);
  background:var(--bg);padding:.125rem .5rem;border-radius:.375rem;
  font-family:var(--font-mono);transition:color .3s;
}
.tech-tag:hover .cat{color:var(--primary)}

/* ---------- Timeline ---------- */
.timeline-section{text-align:center;margin-bottom:3rem}
.timeline-wrap{position:relative;padding-bottom:3rem}

.tl-line{
  position:absolute;left:50%;top:0;bottom:0;width:2px;
  background:linear-gradient(to bottom,transparent,rgba(63,181,165,.3) 10%,rgba(63,181,165,.3) 90%,transparent);
  transform:translateX(-50%);
}
.tl-progress{
  position:absolute;left:50%;top:0;width:2px;height:0;
  background:var(--primary);transform:translateX(-50%);
  transition:height .1s linear;
  box-shadow:0 0 8px rgba(63,181,165,.4);
}

.tl-item{margin-bottom:3rem;opacity:0;transform:translateY(30px);transition:all .6s cubic-bezier(.22,1,.36,1)}
.tl-item.visible{opacity:1;transform:translateY(0)}
.tl-item:last-child{margin-bottom:0}

/* Desktop: alternating */
.tl-desktop{display:none}
@media(min-width:769px){
  .tl-desktop{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:2rem}
  .tl-mobile{display:none !important}
}
.tl-dot{
  width:14px;height:14px;border-radius:50%;
  border:2px solid rgba(63,181,165,.3);background:var(--bg);
  transition:all .4s cubic-bezier(.22,1,.36,1);
  position:relative;z-index:2;
}
.tl-dot.active{
  border-color:var(--primary);background:var(--primary);
  box-shadow:0 0 12px rgba(63,181,165,.5);
}

.tl-card{
  border-radius:var(--radius);border:1px solid var(--border);
  background:var(--bg-card);padding:1.25rem;text-align:left;
  transition:all .5s;
}
.tl-card:hover{
  border-color:rgba(63,181,165,.2);box-shadow:0 8px 30px rgba(63,181,165,.05);
  transform:translateY(-2px);
}
.tl-card-header{display:flex;align-items:center;gap:.5rem;margin-bottom:.5rem}
.tl-card h4{font-size:1rem;font-weight:600;color:var(--fg)}
.tl-card .ext-icon{opacity:0;transition:opacity .3s;color:var(--fg-muted)}
.tl-card:hover .ext-icon{opacity:1}
.tl-card p{font-size:.875rem;color:var(--fg-muted);line-height:1.6}
.tl-date{font-size:.875rem;font-weight:500;color:var(--primary);font-family:var(--font-mono)}

/* Mobile timeline */
@media(max-width:768px){
  .tl-line,.tl-progress{left:20px}
  .tl-mobile{display:grid;grid-template-columns:auto 1fr;gap:1rem;align-items:start}
  .tl-mobile .dot-col{display:flex;flex-direction:column;align-items:center;padding-top:4px}
}

/* ---------- Footer ---------- */
.site-footer{
  position:relative;z-index:10;
  border-top:1px solid var(--border);
  background:rgba(15,18,25,.5);backdrop-filter:blur(8px);
}
.site-footer .inner{
  max-width:72rem;margin:0 auto;padding:1.5rem;
  display:flex;align-items:center;justify-content:space-between;
  flex-wrap:wrap;gap:1rem;
}
.site-footer .copy{font-size:.75rem;color:var(--fg-muted)}
.site-footer .links{display:flex;gap:1.5rem}
.site-footer .links button{
  font-size:.75rem;text-transform:capitalize;color:var(--fg-muted);transition:color .3s;
}
.site-footer .links button:hover{color:var(--fg)}

/* ---------- Spacing helpers ---------- */
.mb-2{margin-bottom:.5rem}
.mb-3{margin-bottom:.75rem}
.mb-4{margin-bottom:1rem}
.mb-6{margin-bottom:1.5rem}
.mb-8{margin-bottom:2rem}
.mb-12{margin-bottom:3rem}
.mb-16{margin-bottom:4rem}
.mt-6{margin-top:1.5rem}