/* =========================================================
   TOKENS
========================================================= */
:root{
  --bg: #0F1115;
  --bg-alt: #14171D;
  --surface: #1B1F27;
  --surface-hover: #232833;
  --border: #2A2F3A;

  --text: #EDEEF2;
  --text-muted: #9AA1AC;
  --text-faint: #656C78;

  --amber: #E8A33D;
  --amber-dim: #B87F2A;
  --teal: #5EC8C0;

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

  --radius: 10px;
  --radius-sm: 6px;
  --ease: cubic-bezier(.22,.61,.36,1);
  --nav-h: 68px;
}

[data-theme="light"]{
  --bg: #F6F5F1;
  --bg-alt: #EFEDE7;
  --surface: #FFFFFF;
  --surface-hover: #F3F1EC;
  --border: #DEDAD1;

  --text: #171A1F;
  --text-muted: #565D6B;
  --text-faint: #8A8F98;

  --amber: #B9711A;
  --amber-dim: #935911;
  --teal: #147A73;
}

*,*::before,*::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
  *{ animation-duration:.001ms !important; animation-iteration-count:1 !important; transition-duration:.001ms !important; }
}

body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:var(--font-body);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  transition:background .3s var(--ease), color .3s var(--ease);
  overflow-x:hidden;
}

h1,h2,h3{ font-family:var(--font-display); font-weight:600; margin:0; letter-spacing:-0.01em; }
p{ margin:0; }
a{ color:inherit; text-decoration:none; }
ul,ol{ margin:0; padding:0; list-style:none; }
button{ font-family:inherit; cursor:pointer; }

.skip-link{
  position:absolute; left:-999px; top:0; background:var(--amber); color:#14171D;
  padding:10px 16px; z-index:200; border-radius:0 0 8px 0;
}
.skip-link:focus{ left:0; }

:focus-visible{ outline:2px solid var(--amber); outline-offset:3px; }

.grid-overlay{
  position:fixed; inset:0; pointer-events:none; z-index:0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size:64px 64px;
  opacity:.15;
}

.section-inner{ max-width:1180px; margin:0 auto; padding:0 32px; position:relative; z-index:1; }

/* =========================================================
   NAV
========================================================= */
.nav{
  position:fixed; top:0; left:0; right:0; height:var(--nav-h);
  z-index:100; backdrop-filter:blur(10px);
  background:color-mix(in srgb, var(--bg) 78%, transparent);
  border-bottom:1px solid var(--border);
}
.nav-inner{
  max-width:1180px; margin:0 auto; padding:0 32px; height:100%;
  display:flex; align-items:center; justify-content:space-between;
}
.nav-brand{ font-family:var(--font-mono); font-weight:600; font-size:1.05rem; letter-spacing:.02em; }
.brand-dot{ color:var(--amber); }
.nav-links{ display:flex; gap:28px; }
.nav-links a{
  font-size:.88rem; color:var(--text-muted); font-family:var(--font-mono);
  position:relative; padding:4px 0; transition:color .2s var(--ease);
}
.nav-links a::after{
  content:''; position:absolute; left:0; bottom:-2px; width:0; height:1px;
  background:var(--amber); transition:width .25s var(--ease);
}
.nav-links a:hover{ color:var(--text); }
.nav-links a:hover::after{ width:100%; }

.nav-actions{ display:flex; align-items:center; gap:10px; }
.icon-btn{
  width:38px; height:38px; border-radius:50%; border:1px solid var(--border);
  background:var(--surface); color:var(--text); display:flex; align-items:center; justify-content:center;
  transition:background .2s var(--ease), transform .2s var(--ease);
}
.icon-btn:hover{ background:var(--surface-hover); transform:translateY(-1px); }
.icon-moon{ display:none; }
[data-theme="light"] .icon-sun{ display:none; }
[data-theme="light"] .icon-moon{ display:block; }

.menu-btn{ display:none; flex-direction:column; gap:5px; background:none; border:none; padding:8px; }
.menu-btn span{ width:20px; height:2px; background:var(--text); display:block; transition:transform .25s var(--ease), opacity .25s var(--ease); }

/* =========================================================
   HERO
========================================================= */
.hero{
  min-height:100vh; display:flex; flex-direction:column; justify-content:center;
  padding:calc(var(--nav-h) + 40px) 32px 60px; position:relative;
}
.hero-inner{
  max-width:1180px; margin:0 auto; width:100%;
  display:grid; grid-template-columns:1.05fr .95fr; gap:64px; align-items:center;
}
.eyebrow{
  display:inline-flex; align-items:center; gap:8px; font-family:var(--font-mono);
  font-size:.8rem; color:var(--teal); margin-bottom:22px; letter-spacing:.02em;
}
.eyebrow-dot{ width:7px; height:7px; border-radius:50%; background:var(--teal); box-shadow:0 0 0 4px color-mix(in srgb, var(--teal) 25%, transparent); animation:pulse 2.2s infinite; }
@keyframes pulse{ 0%,100%{ opacity:1; } 50%{ opacity:.4; } }

.hero-title{
  font-size:clamp(2.6rem, 5.2vw, 4.4rem); line-height:1.02; margin-bottom:14px;
  animation:riseIn .7s var(--ease) both;
}
.hero-title .accent{ color:var(--amber); }
.hero-role{
  font-family:var(--font-mono); font-size:clamp(1.05rem,1.6vw,1.3rem); color:var(--text-muted);
  margin-bottom:20px; animation:riseIn .7s var(--ease) .08s both;
}
.hero-tagline{
  font-size:1.05rem; color:var(--text-muted); max-width:52ch; margin-bottom:34px;
  animation:riseIn .7s var(--ease) .16s both;
}
@keyframes riseIn{ from{ opacity:0; transform:translateY(16px); } to{ opacity:1; transform:translateY(0); } }

.hero-cta{ display:flex; flex-wrap:wrap; gap:14px; margin-bottom:30px; animation:riseIn .7s var(--ease) .24s both; }
.hero-meta{
  font-family:var(--font-mono); font-size:.82rem; color:var(--text-faint);
  display:flex; flex-wrap:wrap; gap:8px; animation:riseIn .7s var(--ease) .32s both;
}
.dot-sep{ color:var(--border); }

.btn{
  display:inline-flex; align-items:center; gap:8px; padding:13px 22px; border-radius:var(--radius-sm);
  font-size:.92rem; font-weight:600; font-family:var(--font-body); border:1px solid transparent;
  transition:transform .2s var(--ease), background .2s var(--ease), border-color .2s var(--ease), box-shadow .2s var(--ease);
}
.btn-primary{ background:var(--amber); color:#141517; }
.btn-primary:hover{ background:var(--amber-dim); transform:translateY(-2px); box-shadow:0 8px 24px -8px color-mix(in srgb, var(--amber) 60%, transparent); }
.btn-outline{ border-color:var(--border); color:var(--text); background:transparent; }
.btn-outline:hover{ border-color:var(--amber); color:var(--amber); transform:translateY(-2px); }
.btn-ghost{ color:var(--text-muted); padding:13px 6px; }
.btn-ghost:hover{ color:var(--amber); }
.btn-sm{ padding:9px 16px; font-size:.85rem; }
.btn-full{ width:100%; justify-content:center; }

/* --- signature stack element --- */
.hero-stack{ display:flex; flex-direction:column; gap:10px; animation:riseIn .8s var(--ease) .2s both; }
.stack-layer{
  background:var(--surface); border:1px solid var(--border); border-left:3px solid var(--border);
  border-radius:var(--radius-sm); padding:16px 18px; cursor:default;
  transition:border-color .25s var(--ease), background .25s var(--ease), transform .25s var(--ease);
}
.stack-layer:hover, .stack-layer:focus-visible{
  border-left-color:var(--amber); background:var(--surface-hover); transform:translateX(6px);
}
.stack-layer:nth-child(2):hover, .stack-layer:nth-child(2):focus-visible{ border-left-color:var(--teal); }
.stack-layer:nth-child(4):hover, .stack-layer:nth-child(4):focus-visible{ border-left-color:var(--teal); }
.layer-head{ display:flex; align-items:center; gap:10px; margin-bottom:6px; }
.layer-index{ font-family:var(--font-mono); font-size:.72rem; color:var(--amber); border:1px solid var(--border); padding:2px 6px; border-radius:4px; }
.layer-name{ font-family:var(--font-display); font-weight:600; font-size:1rem; }
.layer-detail{ font-size:.85rem; color:var(--text-muted); font-family:var(--font-mono); }

.scroll-cue{ position:absolute; bottom:26px; left:50%; transform:translateX(-50%); }
.scroll-cue span{ display:block; width:1px; height:34px; background:linear-gradient(var(--amber), transparent); position:relative; overflow:hidden; }
.scroll-cue span::after{ content:''; position:absolute; top:-34px; left:0; width:100%; height:34px; background:var(--text); animation:scrollDown 1.8s infinite; }
@keyframes scrollDown{ to{ top:34px; } }

/* =========================================================
   SECTIONS (shared)
========================================================= */
.section{ padding:110px 0; position:relative; }
.section-alt{ background:var(--bg-alt); }
.section-head{ margin-bottom:52px; max-width:640px; }
.section-label{ font-family:var(--font-mono); font-size:.8rem; color:var(--amber); margin-bottom:12px; letter-spacing:.03em; }
.section-label.light{ color:var(--bg); opacity:.75; }
.section-head h2{ font-size:clamp(1.8rem,3vw,2.5rem); }

/* fade-up on scroll */
.reveal{ opacity:0; transform:translateY(24px); transition:opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.is-visible{ opacity:1; transform:translateY(0); }

/* =========================================================
   ABOUT
========================================================= */
.about-grid{ display:grid; grid-template-columns:.7fr 1.3fr; gap:56px; }
.about-body p{ color:var(--text-muted); margin-bottom:18px; max-width:65ch; }
.about-strengths{ display:grid; grid-template-columns:repeat(3,1fr); gap:20px; margin-top:34px; }
.strength{ border-top:1px solid var(--border); padding-top:14px; }
.strength-num{ display:block; font-family:var(--font-display); font-size:1.8rem; color:var(--amber); margin-bottom:6px; }
.strength-label{ font-size:.85rem; color:var(--text-muted); }

/* =========================================================
   SKILLS
========================================================= */
.skills-grid{ display:grid; grid-template-columns:repeat(2,1fr); gap:26px; }
.skill-card{ background:var(--surface); border:1px solid var(--border); border-radius:var(--radius); padding:28px; }
.skill-card h3{ font-size:1.05rem; margin-bottom:20px; }
.skill-bars li{ display:grid; grid-template-columns:1fr 40%; align-items:center; gap:16px; margin-bottom:16px; }
.skill-bars li:last-child{ margin-bottom:0; }
.skill-name{ font-size:.9rem; }
.skill-tag{ font-family:var(--font-mono); font-size:.72rem; color:var(--text-faint); margin-left:6px; }
.bar{ height:6px; border-radius:4px; background:var(--border); overflow:hidden; display:block; }
.bar i{ display:block; height:100%; width:0; border-radius:4px; background:linear-gradient(90deg, var(--amber-dim), var(--amber)); transition:width 1.1s var(--ease); }
.bar.filled i{ width:var(--w); }

.chip-row{ display:flex; flex-wrap:wrap; gap:9px; }
.chip{
  font-family:var(--font-mono); font-size:.78rem; padding:7px 12px; border-radius:20px;
  border:1px solid var(--border); color:var(--text-muted); background:var(--bg);
  transition:border-color .2s var(--ease), color .2s var(--ease);
}
.chip:hover{ border-color:var(--teal); color:var(--teal); }
.chip-sm{ padding:5px 10px; font-size:.72rem; }

/* =========================================================
   STACK STRIP
========================================================= */
.stack-strip{ background:var(--amber); color:#14171D; padding:44px 0; overflow:hidden; }
.strip-track{ display:flex; align-items:stretch; gap:18px; flex-wrap:wrap; margin-top:18px; }
.strip-item{
  font-family:var(--font-mono); font-size:.85rem; background:rgba(20,21,23,.08);
  border:1px solid rgba(20,21,23,.22); border-radius:8px; padding:12px 16px; min-width:170px;
}
.strip-item span{ display:block; font-weight:700; margin-bottom:4px; }
.strip-arrow{ display:flex; align-items:center; font-size:1.2rem; opacity:.6; }

/* =========================================================
   PROJECTS
========================================================= */
.project-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:24px; }
.project-card{
  background:var(--surface); border:1px solid var(--border); border-radius:var(--radius);
  padding:26px; display:flex; flex-direction:column; gap:12px;
  transition:transform .3s var(--ease), border-color .3s var(--ease), box-shadow .3s var(--ease);
}
.project-card:hover{ transform:translateY(-6px); border-color:var(--amber); box-shadow:0 18px 40px -20px rgba(0,0,0,.5); }
.project-top{ display:flex; align-items:center; justify-content:space-between; }
.project-layer{ font-family:var(--font-mono); font-size:.72rem; color:var(--teal); border:1px solid var(--border); padding:3px 8px; border-radius:12px; }
.project-link{ color:var(--text-muted); transition:color .2s var(--ease); }
.project-link:hover{ color:var(--amber); }
.project-card h3{ font-size:1.08rem; }
.project-problem, .project-detail{ font-size:.88rem; color:var(--text-muted); }
.project-problem strong{ color:var(--text); }
.project-achievement{ font-family:var(--font-mono); font-size:.78rem; color:var(--amber); }
.project-tech{ display:flex; flex-wrap:wrap; gap:6px; margin-top:auto; padding-top:6px; }
.project-card-cta{ align-items:flex-start; justify-content:center; background:transparent; border-style:dashed; }

/* =========================================================
   EXPERIENCE
========================================================= */
.timeline{ position:relative; padding-left:28px; border-left:1px solid var(--border); }
.timeline-item{ position:relative; padding-bottom:38px; padding-left:26px; }
.timeline-item:last-child{ padding-bottom:0; }
.timeline-dot{ position:absolute; left:-33px; top:4px; width:9px; height:9px; border-radius:50%; background:var(--amber); box-shadow:0 0 0 4px var(--bg-alt); }
.timeline-date{ font-family:var(--font-mono); font-size:.78rem; color:var(--text-faint); margin-bottom:6px; }
.timeline-body h3{ font-size:1rem; margin-bottom:8px; font-weight:600; }
.timeline-org{ font-weight:400; color:var(--text-muted); font-family:var(--font-body); }
.timeline-body p{ font-size:.9rem; color:var(--text-muted); max-width:70ch; }

.leadership-block{ margin-top:56px; padding-top:40px; border-top:1px solid var(--border); }
.leadership-block h3{ font-size:1.05rem; margin-bottom:16px; }
.leadership-list li{ font-size:.9rem; color:var(--text-muted); padding-left:18px; position:relative; margin-bottom:10px; }
.leadership-list li::before{ content:'—'; position:absolute; left:0; color:var(--amber); }

/* =========================================================
   EDUCATION
========================================================= */
.edu-card{
  background:var(--surface); border:1px solid var(--border); border-radius:var(--radius);
  padding:32px; display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:20px;
}
.edu-main h3{ font-size:1.2rem; margin-bottom:8px; }
.edu-school{ color:var(--text-muted); font-size:.92rem; }
.edu-side{ display:flex; gap:12px; flex-wrap:wrap; }
.edu-stat{ font-family:var(--font-mono); font-size:.82rem; border:1px solid var(--border); border-radius:20px; padding:8px 14px; color:var(--amber); }

/* =========================================================
   CERTIFICATIONS
========================================================= */
.cert-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:20px; }
.cert-card{ background:var(--surface); border:1px solid var(--border); border-radius:var(--radius); padding:22px; transition:border-color .2s var(--ease); }
.cert-card:hover{ border-color:var(--teal); }
.cert-card h3{ font-size:.95rem; margin-bottom:8px; line-height:1.4; }
.cert-card p{ font-size:.82rem; color:var(--text-muted); font-family:var(--font-mono); }

/* =========================================================
   CONTACT
========================================================= */
.contact-sub{ color:var(--text-muted); margin-top:12px; }
.contact-grid{ display:grid; grid-template-columns:.9fr 1.1fr; gap:50px; }
.contact-links{ display:flex; flex-direction:column; gap:14px; }
.contact-row{
  display:flex; align-items:center; gap:14px; padding:16px 18px; border:1px solid var(--border);
  border-radius:var(--radius-sm); background:var(--surface); font-size:.92rem;
  transition:border-color .2s var(--ease), transform .2s var(--ease);
}
.contact-row:hover{ border-color:var(--amber); transform:translateX(4px); }
.contact-icon{
  width:30px; height:30px; border-radius:50%; background:var(--bg); display:flex; align-items:center;
  justify-content:center; font-family:var(--font-mono); font-size:.85rem; color:var(--amber); flex-shrink:0;
}

.contact-form{ display:flex; flex-direction:column; gap:6px; background:var(--surface); border:1px solid var(--border); border-radius:var(--radius); padding:28px; }
.contact-form label{ font-family:var(--font-mono); font-size:.78rem; color:var(--text-muted); margin-top:12px; }
.contact-form input, .contact-form textarea{
  background:var(--bg); border:1px solid var(--border); border-radius:var(--radius-sm); color:var(--text);
  padding:12px 14px; font-family:var(--font-body); font-size:.92rem; resize:vertical;
  transition:border-color .2s var(--ease);
}
.contact-form input:focus, .contact-form textarea:focus{ border-color:var(--amber); outline:none; }
.contact-form button{ margin-top:20px; }
.form-note{ font-size:.82rem; color:var(--teal); min-height:1.2em; margin-top:10px; }

/* =========================================================
   FOOTER
========================================================= */
.footer{ border-top:1px solid var(--border); padding:32px 0; }
.footer-inner{ display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:14px; }
.footer p{ font-size:.82rem; color:var(--text-faint); font-family:var(--font-mono); }
.footer-links{ display:flex; gap:20px; }
.footer-links a{ font-size:.82rem; color:var(--text-muted); transition:color .2s var(--ease); }
.footer-links a:hover{ color:var(--amber); }

.scroll-top{
  position:fixed; bottom:26px; right:26px; width:44px; height:44px; border-radius:50%;
  background:var(--amber); color:#14171D; border:none; font-size:1.1rem; display:flex;
  align-items:center; justify-content:center; opacity:0; pointer-events:none; transform:translateY(10px);
  transition:opacity .3s var(--ease), transform .3s var(--ease); z-index:90;
}
.scroll-top.visible{ opacity:1; pointer-events:auto; transform:translateY(0); }

/* =========================================================
   RESPONSIVE
========================================================= */
@media (max-width: 980px){
  .hero-inner{ grid-template-columns:1fr; gap:48px; }
  .about-grid{ grid-template-columns:1fr; }
  .skills-grid{ grid-template-columns:1fr; }
  .project-grid{ grid-template-columns:repeat(2,1fr); }
  .cert-grid{ grid-template-columns:repeat(2,1fr); }
  .contact-grid{ grid-template-columns:1fr; }
}

@media (max-width: 760px){
  .nav-links{
    position:fixed; top:var(--nav-h); left:0; right:0; background:var(--bg);
    border-bottom:1px solid var(--border); flex-direction:column; padding:20px 32px; gap:16px;
    transform:translateY(-120%); opacity:0; transition:transform .3s var(--ease), opacity .3s var(--ease);
  }
  .nav-links.open{ transform:translateY(0); opacity:1; }
  .menu-btn{ display:flex; }
  .menu-btn.open span:nth-child(1){ transform:translateY(7px) rotate(45deg); }
  .menu-btn.open span:nth-child(2){ opacity:0; }
  .menu-btn.open span:nth-child(3){ transform:translateY(-7px) rotate(-45deg); }

  .project-grid{ grid-template-columns:1fr; }
  .cert-grid{ grid-template-columns:1fr; }
  .about-strengths{ grid-template-columns:1fr; }
  .edu-card{ flex-direction:column; align-items:flex-start; }
  .section{ padding:80px 0; }
  .hero{ padding-top:calc(var(--nav-h) + 20px); }
}