/* ============================================================
   Harrison Smith · AI Engineer & Educator — Portfolio Styles
   ============================================================ */

:root{
  --bg:            #08080f;
  --bg-alt:        #0d0d1a;
  --surface:       #12121f;
  --surface-2:     #171728;
  --border:        rgba(255,255,255,0.08);
  --border-strong: rgba(255,255,255,0.16);

  --text:          #f3f3f8;
  --text-dim:      #b6b6c9;
  --text-mute:     #83839a;

  --accent-1:      #7c5cff;   /* violet */
  --accent-2:      #4cc9f0;   /* cyan   */
  --accent-3:      #ff5cad;   /* pink   */
  --accent-warn:   #ffb454;

  --gradient-brand: linear-gradient(120deg, var(--accent-1) 0%, var(--accent-2) 55%, var(--accent-3) 100%);
  --gradient-text:  linear-gradient(100deg, #a78bfa, #67e8f9 50%, #f472b6);

  --font-display: 'Space Grotesk', 'Inter', system-ui, sans-serif;
  --font-body:    'Inter', system-ui, -apple-system, sans-serif;
  --font-mono:    'JetBrains Mono', ui-monospace, monospace;

  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;

  --wrap: 1180px;

  --shadow-glow: 0 0 0 1px rgba(255,255,255,0.06), 0 20px 60px -20px rgba(124,92,255,0.35);
  --ease: cubic-bezier(.22,1,.36,1);
}

@media (prefers-color-scheme: light){
  :root{
    --bg:            #f7f7fb;
    --bg-alt:        #ffffff;
    --surface:       #ffffff;
    --surface-2:     #f1f1f8;
    --border:        rgba(10,10,20,0.08);
    --border-strong: rgba(10,10,20,0.14);
    --text:          #14141f;
    --text-dim:      #4b4b5c;
    --text-mute:     #6f6f83;
    --shadow-glow: 0 0 0 1px rgba(10,10,20,0.05), 0 20px 60px -20px rgba(124,92,255,0.25);
  }
}

/* ---------- Reset ---------- */
*, *::before, *::after{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
body{
  margin:0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
h1,h2,h3,h4{
  font-family: var(--font-display);
  line-height: 1.15;
  margin: 0 0 .5em;
  letter-spacing: -0.01em;
}
p{ margin: 0 0 1em; color: var(--text-dim); }
a{ color: inherit; text-decoration: none; }
ul{ margin:0; padding:0; list-style:none; }
img{ max-width:100%; display:block; }
button{ font-family: inherit; }

::selection{ background: var(--accent-1); color:#fff; }

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

.text-gradient{
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.link-underline{
  text-decoration: underline;
  text-decoration-color: rgba(124,92,255,0.5);
  text-underline-offset: 6px;
}

.skip-link{
  position:absolute; left:-999px; top:0;
  background: var(--accent-1); color:#fff; padding: 10px 16px; z-index:200;
  border-radius: 0 0 8px 0;
}
.skip-link:focus{ left:0; }

/* ---------- Background flourishes ---------- */
.grain{
  position: fixed; inset:0; pointer-events:none; z-index:1; opacity:.035; mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
.bg-orbs{ position: fixed; inset:0; z-index:0; overflow:hidden; pointer-events:none; }
.orb{
  position:absolute; border-radius:50%;
  filter: blur(90px); opacity:.35;
  animation: float 22s ease-in-out infinite;
}
.orb-1{ width:520px; height:520px; top:-160px; left:-120px; background: var(--accent-1); }
.orb-2{ width:460px; height:460px; top:30%; right:-160px; background: var(--accent-2); animation-delay: -7s; }
.orb-3{ width:420px; height:420px; bottom:-180px; left:20%; background: var(--accent-3); animation-delay: -14s; }

@keyframes float{
  0%,100%{ transform: translate(0,0) scale(1); }
  33%{ transform: translate(30px,-40px) scale(1.08); }
  66%{ transform: translate(-25px,25px) scale(0.95); }
}
@media (prefers-reduced-motion: reduce){
  .orb{ animation: none; }
  html{ scroll-behavior:auto; }
}

/* ---------- Header ---------- */
.site-header{
  position: fixed; top:0; left:0; right:0; z-index: 100;
  backdrop-filter: blur(14px) saturate(140%);
  background: color-mix(in srgb, var(--bg) 65%, transparent);
  border-bottom: 1px solid transparent;
  transition: border-color .3s var(--ease), background .3s var(--ease);
}
.site-header.scrolled{
  border-bottom-color: var(--border);
}
.header-inner{
  display:flex; align-items:center; justify-content:space-between;
  height: 72px;
}
.brand-mark{
  font-family: var(--font-display); font-weight:700; font-size: 1.15rem;
  letter-spacing:-0.02em;
}
.brand-mark .dot{ color: var(--accent-2); }

.nav{
  display:flex; align-items:center; gap: 30px;
  font-size: .95rem; font-weight:500;
}
.nav a{ color: var(--text-dim); position:relative; padding: 4px 0; transition: color .2s; }
.nav a:hover{ color: var(--text); }
.nav a:not(.nav-cta)::after{
  content:''; position:absolute; left:0; right:100%; bottom:-2px; height:2px;
  background: var(--gradient-brand); transition: right .25s var(--ease);
}
.nav a:not(.nav-cta):hover::after{ right:0; }
.nav a.active:not(.nav-cta){ color: var(--text); }
.nav a.active:not(.nav-cta)::after{ right:0; }

.nav-cta{
  background: var(--gradient-brand);
  color:#08080f !important;
  padding: 9px 18px !important;
  border-radius: 999px;
  font-weight:600 !important;
}

.nav-toggle{
  display:none; flex-direction:column; justify-content:center; gap:5px;
  width:38px; height:38px; background:none; border:none; cursor:pointer;
}
.nav-toggle span{ width:22px; height:2px; background: var(--text); transition: all .25s var(--ease); }

/* ---------- Hero ---------- */
.hero{
  position:relative; z-index:2;
  min-height: 100svh;
  display:flex; flex-direction:column; align-items:center; justify-content:center;
  padding-top: 90px;
  text-align:center;
}
.hero-inner{ max-width: 880px; }
.eyebrow{
  display:inline-block; font-family: var(--font-mono); font-size:.8rem; letter-spacing:.06em;
  color: var(--accent-2); text-transform: uppercase; margin-bottom: 22px;
  padding: 6px 14px; border:1px solid var(--border-strong); border-radius:999px;
}
.hero-title{
  font-size: clamp(2.4rem, 6vw, 4.4rem);
  font-weight: 700;
  margin-bottom: .45em;
}
.hero-sub{
  font-size: clamp(1.02rem, 1.6vw, 1.2rem);
  color: var(--text-dim);
  max-width: 680px; margin: 0 auto 2.2em;
}
.hero-sub a{ color: var(--accent-2); font-weight:600; }
.hero-sub a:hover{ text-decoration: underline; }

.hero-actions{
  display:flex; flex-wrap:wrap; gap:14px; justify-content:center; margin-bottom: 3.2em;
}

.btn{
  display:inline-flex; align-items:center; gap:8px;
  padding: 13px 26px;
  border-radius: 999px;
  font-weight:600; font-size:.98rem;
  border: 1px solid transparent;
  transition: transform .2s var(--ease), box-shadow .2s var(--ease), background .2s, border-color .2s;
  cursor:pointer;
}
.btn-primary{
  background: var(--gradient-brand);
  color:#08080f;
  box-shadow: var(--shadow-glow);
}
.btn-primary:hover{ transform: translateY(-2px); box-shadow: 0 0 0 1px rgba(255,255,255,0.1), 0 24px 70px -18px rgba(124,92,255,0.55); }
.btn-ghost{
  background: transparent;
  border-color: var(--border-strong);
  color: var(--text);
}
.btn-ghost:hover{ background: var(--surface-2); transform: translateY(-2px); }
.btn-lg{ padding: 15px 32px; font-size: 1.05rem; }

.hero-stats{
  display:flex; gap: clamp(20px,5vw,56px); justify-content:center; flex-wrap:wrap;
  margin:0; padding-top: 2.4em; border-top:1px solid var(--border);
}
.hero-stats dt{
  font-family: var(--font-display); font-size: 1.7rem; font-weight:700;
  background: var(--gradient-text); -webkit-background-clip:text; background-clip:text; color:transparent;
}
.hero-stats dd{ margin:2px 0 0; font-size:.85rem; color: var(--text-mute); }

.scroll-cue{
  position:absolute; bottom: 34px; left:50%; transform: translateX(-50%);
  width:26px; height:42px; border:2px solid var(--border-strong); border-radius:20px;
}
.scroll-cue span{
  display:block; width:4px; height:8px; border-radius:2px; background: var(--accent-2);
  margin: 7px auto 0; animation: scrollcue 1.8s ease-in-out infinite;
}
@keyframes scrollcue{
  0%{ transform: translateY(0); opacity:1; }
  70%{ transform: translateY(14px); opacity:0; }
  100%{ opacity:0; }
}

/* ---------- Sections (generic) ---------- */
.section{ position:relative; z-index:2; padding: 120px 0; }
.section-alt{ background: var(--bg-alt); border-top:1px solid var(--border); border-bottom:1px solid var(--border); }

.section-kicker{
  font-family: var(--font-mono); text-transform:uppercase; letter-spacing:.08em;
  font-size:.8rem; color: var(--accent-1); margin-bottom: .8em; font-weight:600;
}
.section-title{ font-size: clamp(1.9rem, 3.6vw, 2.7rem); max-width: 780px; }
.section-lede{ font-size: 1.08rem; max-width: 680px; }

/* ---------- About ---------- */
.about-grid{
  display:grid; grid-template-columns: 1.15fr .85fr; gap: 60px; margin-top: 50px; align-items:start;
}
.about-text p{ font-size: 1.02rem; }
.about-text strong{ color: var(--text); }

.about-card{
  background: var(--surface); border:1px solid var(--border); border-radius: var(--radius-lg);
  padding: 32px; display:flex; flex-direction:column; gap: 26px;
}
.edu-item{ display:flex; gap:18px; }
.edu-badge{
  flex:none; font-family: var(--font-mono); font-size:.8rem; font-weight:700;
  color: var(--accent-2); border: 1px solid var(--border-strong); border-radius: 8px;
  padding: 4px 9px; height: fit-content;
}
.edu-item h3{ font-size: 1.05rem; margin-bottom:.25em; }
.edu-item p{ margin: 0 0 .35em; font-size:.94rem; }
.muted{ color: var(--text-mute) !important; font-size:.87rem !important; }

/* ---------- Capstone ---------- */
.capstone-cta{
  display:flex; align-items:center; gap:18px; flex-wrap:wrap; margin: 30px 0 60px;
}
.status-pill{
  display:inline-flex; align-items:center; gap:8px; font-size:.85rem; color: var(--text-dim);
  border:1px solid var(--border-strong); padding: 8px 14px; border-radius: 999px;
}
.status-dot{
  width:8px; height:8px; border-radius:50%; background: #4ade80;
  box-shadow: 0 0 0 0 rgba(74,222,128,0.6);
  animation: pulse 2s infinite;
}
@keyframes pulse{
  0%{ box-shadow: 0 0 0 0 rgba(74,222,128,0.55); }
  70%{ box-shadow: 0 0 0 8px rgba(74,222,128,0); }
  100%{ box-shadow: 0 0 0 0 rgba(74,222,128,0); }
}

.pipeline{
  display:grid; grid-template-columns: repeat(6, 1fr); gap:16px; margin-bottom: 60px;
}
.pipeline-step{
  position:relative;
  background: var(--surface); border:1px solid var(--border); border-radius: var(--radius-md);
  padding: 24px 20px 20px;
  transition: transform .25s var(--ease), border-color .25s;
}
.pipeline-step:hover{ transform: translateY(-4px); border-color: var(--border-strong); }
.pipeline-step:not(:last-child)::after{
  content:'→'; position:absolute; right:-15px; top:50%; transform: translateY(-50%);
  color: var(--text-mute); font-size:1.1rem; z-index:1; display:none;
}
.pipeline-num{
  display:block; font-family: var(--font-mono); font-size:.8rem; font-weight:700;
  color: var(--accent-2); margin-bottom: 10px;
}
.pipeline-step h3{ font-size: 1rem; margin-bottom:.4em; }
.pipeline-step p{ font-size:.86rem; margin:0; }

.capstone-lessons{
  background: linear-gradient(135deg, rgba(124,92,255,0.08), rgba(76,201,240,0.06));
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 40px;
}
.capstone-lessons h3{ font-size: 1.3rem; margin-bottom:.6em; }
.capstone-lessons p{ font-size: 1.02rem; margin:0; }
.capstone-lessons strong{ color: var(--text); }

/* ---------- Cards / Work ---------- */
.card-grid{
  display:grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 50px;
}
.card{
  background: var(--surface); border:1px solid var(--border); border-radius: var(--radius-lg);
  padding: 32px; transition: transform .3s var(--ease), border-color .3s, box-shadow .3s;
}
.card:hover{
  transform: translateY(-6px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-glow);
}
.card-icon{
  width:48px; height:48px; display:flex; align-items:center; justify-content:center;
  border-radius: 12px; font-size:1.3rem; margin-bottom: 20px;
  background: var(--gradient-brand); color:#08080f;
}
.card h3{ font-size: 1.15rem; margin-bottom:.5em; }
.card p{ font-size:.94rem; }
.tag-list{ display:flex; flex-wrap:wrap; gap:8px; margin-top: 16px; }
.tag-list li{
  font-family: var(--font-mono); font-size:.75rem; color: var(--text-dim);
  border:1px solid var(--border); border-radius: 6px; padding: 4px 9px;
}

/* ---------- Timeline ---------- */
.timeline{
  position:relative; margin-top: 50px;
  padding-left: 32px;
  border-left: 2px solid var(--border);
}
.timeline-item{ position:relative; padding-bottom: 46px; }
.timeline-item:last-child{ padding-bottom:0; }
.timeline-marker{
  position:absolute; left:-38px; top:4px;
  width:12px; height:12px; border-radius:50%;
  background: var(--gradient-brand);
  box-shadow: 0 0 0 4px var(--bg-alt), 0 0 0 5px var(--border-strong);
}
.timeline-head{
  display:flex; flex-wrap:wrap; align-items:baseline; gap: 10px 16px; margin-bottom:.2em;
}
.timeline-head h3{ font-size: 1.15rem; margin:0; }
.timeline-date{
  font-family: var(--font-mono); font-size:.78rem; color: var(--accent-2);
}
.timeline-org{ font-weight:600; color: var(--text-dim); margin-bottom: .7em; }
.timeline-content ul{ display:flex; flex-direction:column; gap:8px; }
.timeline-content li{
  position:relative; padding-left: 18px; font-size:.94rem; color: var(--text-dim);
}
.timeline-content li::before{
  content:''; position:absolute; left:0; top:9px; width:6px; height:6px; border-radius:50%;
  background: var(--accent-1);
}
.linkedin-cta{ margin-top: 40px; font-size:.94rem; }
.linkedin-cta a{ color: var(--accent-2); font-weight:600; }

/* ---------- Skills ---------- */
.skills-grid{
  display:grid; grid-template-columns: repeat(2, 1fr); gap: 20px; margin-top: 50px;
}
.skill-group{
  background: var(--surface); border:1px solid var(--border); border-radius: var(--radius-lg);
  padding: 28px 30px; transition: border-color .25s;
}
.skill-group:hover{ border-color: var(--border-strong); }
.skill-group h3{
  font-size: 1rem; text-transform:uppercase; letter-spacing:.04em;
  color: var(--accent-1); margin-bottom:.6em;
}
.skill-group p{ font-size:.95rem; margin:0; }

/* ---------- Teaching ---------- */
.teaching-wrap{ text-align:center; }
.teaching-wrap .section-title{ margin-left:auto; margin-right:auto; }
.teaching-grid{
  display:grid; grid-template-columns: repeat(2,1fr); gap: 24px; margin: 50px 0 40px; text-align:left;
}
.teaching-card{
  background: var(--surface); border:1px solid var(--border); border-radius: var(--radius-lg); padding: 34px;
}
.teaching-card h3{ font-size:1.2rem; }
.teaching-card p{ font-size:.96rem; margin:0; }
.teaching-cta{ margin-top: 10px; }

/* ---------- Contact ---------- */
.contact-section{ padding-bottom: 100px; }
.contact-grid{
  display:grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-top: 46px;
}
.contact-item{
  display:flex; flex-direction:column; gap:6px;
  background: var(--surface); border:1px solid var(--border); border-radius: var(--radius-md);
  padding: 22px; transition: transform .25s var(--ease), border-color .25s;
}
.contact-item:hover{ transform: translateY(-4px); border-color: var(--accent-1); }
.contact-label{ font-family: var(--font-mono); font-size:.75rem; text-transform:uppercase; letter-spacing:.06em; color: var(--text-mute); }
.contact-value{ font-weight:600; font-size:.98rem; word-break: break-word; }

/* ---------- Footer ---------- */
.site-footer{
  position:relative; z-index:2;
  border-top: 1px solid var(--border);
  padding: 30px 0;
}
.footer-inner{
  display:flex; justify-content:space-between; flex-wrap:wrap; gap:10px;
  font-size:.85rem; color: var(--text-mute);
}

/* ---------- Reveal animation ---------- */
.reveal{
  opacity:0; transform: translateY(24px);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
}
.reveal.in-view{ opacity:1; transform: translateY(0); }
@media (prefers-reduced-motion: reduce){
  .reveal{ opacity:1; transform:none; transition:none; }
}

/* ---------- Responsive ---------- */
@media (max-width: 980px){
  .about-grid{ grid-template-columns:1fr; }
  .card-grid{ grid-template-columns: 1fr 1fr; }
  .pipeline{ grid-template-columns: repeat(3,1fr); }
  .skills-grid{ grid-template-columns:1fr; }
  .contact-grid{ grid-template-columns: 1fr 1fr; }
}

@media (max-width: 760px){
  .nav{
    position:fixed; top:72px; left:0; right:0;
    flex-direction:column; align-items:stretch; gap:0;
    background: var(--bg); border-bottom:1px solid var(--border);
    max-height:0; overflow:hidden; transition: max-height .3s var(--ease);
  }
  .nav.open{ max-height: 420px; }
  .nav a{ padding: 16px 24px; border-bottom:1px solid var(--border); }
  .nav a::after{ display:none; }
  .nav-cta{ margin: 14px 24px; text-align:center; }
  .nav-toggle{ display:flex; }

  .card-grid{ grid-template-columns:1fr; }
  .pipeline{ grid-template-columns: repeat(2,1fr); }
  .teaching-grid{ grid-template-columns:1fr; }
  .contact-grid{ grid-template-columns:1fr; }
  .section{ padding: 84px 0; }
  .hero-stats{ gap: 30px; }
}