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

/* ── Design tokens ────────────────────────────────────────── */
:root{
  --bg:        #050e0a;
  --bg2:       #0a1612;
  --bg3:       #0f1e18;
  --border:    #1a3028;
  --border-hi: #2a4a3a;
  --text:      #d4ede3;
  --text-muted:#6b9e84;
  --accent:    #34d399;
  --accent2:   #22d3ee;
  --accent3:   #a3e635;
  --tag-bg:    #0d2018;
  --tag-text:  #6ee7b7;
  --tag-border:rgba(110,231,183,.15);
  --font-mono: ui-monospace,'Cascadia Code','Fira Code','Consolas',monospace;
  --font-sans: ui-sans-serif,system-ui,-apple-system,'Segoe UI',sans-serif;
  --radius:    8px;
}

/* ── Light mode ────────────────────────────────────────────── */
body.light-mode{
  --bg:        #f8fafc;
  --bg2:       #f1f5f9;
  --bg3:       #e2e8f0;
  --border:    #cbd5e1;
  --border-hi: #94a3b8;
  --text:      #0f172a;
  --text-muted:#475569;
  --accent:    #059669;
  --accent2:   #0891b2;
  --accent3:   #65a30d;
  --tag-bg:    #dbeafe;
  --tag-text:  #0369a1;
  --tag-border:rgba(3,105,161,.15);
}

html{scroll-behavior:smooth;font-size:16px;-webkit-text-size-adjust:100%}
body{
  background:var(--bg);color:var(--text);
  font-family:var(--font-sans);line-height:1.7;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeSpeed;
}
a{color:var(--accent);text-decoration:none;transition:opacity .18s}
a:hover{opacity:.72}
a:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:3px}
ul{list-style:none}

.skip-link{
  position:absolute;top:-100%;left:1rem;
  background:var(--accent);color:#050e0a;
  padding:.5rem 1rem;border-radius:0 0 var(--radius) var(--radius);
  font-weight:700;z-index:9999;transition:top .15s;
}
.skip-link:focus{top:0}

.container{max-width:900px;margin:0 auto;padding:0 1.5rem}

nav{
  position:fixed;top:0;left:0;right:0;z-index:100;
  background:rgba(5,14,10,.9);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  border-bottom:1px solid var(--border);
  will-change:transform;
  contain:layout style;
  transition:background-color .25s,border-color .25s;
}
body.light-mode nav{
  background:rgba(248,250,252,.95);
  border-bottom-color:var(--border);
}
.nav-inner{
  max-width:900px;margin:0 auto;padding:.85rem 1.5rem;
  display:flex;align-items:center;justify-content:space-between;gap:1rem;
}
.nav-logo{
  font-family:var(--font-mono);font-size:.95rem;
  color:var(--accent);font-weight:700;letter-spacing:.02em;
}
.nav-logo span{color:var(--text-muted)}
.nav-links{display:flex;gap:1.5rem;align-items:center;flex-wrap:wrap}
.nav-links a{
  font-size:.82rem;color:var(--text-muted);
  font-family:var(--font-mono);letter-spacing:.04em;
  transition:color .18s;
}
.nav-links a:hover,.nav-links a[aria-current]{color:var(--accent)}
.nav-toggle{
  display:none;background:none;border:none;cursor:pointer;
  color:var(--text);padding:.25rem;flex-direction:column;gap:5px;
}
.nav-toggle span{
  display:block;width:22px;height:2px;
  background:currentColor;border-radius:2px;
  transition:transform .25s,opacity .25s;
}
.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;transform:scaleX(0)}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
#theme-toggle{
  background:transparent !important;
  border:none !important;
  cursor:pointer;
  color:var(--text) !important;
  padding:.25rem;
  display:flex;
  align-items:center;
  justify-content:center;
  transition:transform .25s,color .18s;
}
#theme-toggle:hover{
  transform:scale(1.1);
  color:var(--accent) !important;
}
#theme-toggle svg,
#theme-toggle .theme-icon{
  fill:currentColor !important;
  color:inherit !important;
  width:20px;
  height:20px;
}
.theme-icon line,
.theme-icon circle{
  stroke:currentColor;
  fill:none;
  stroke-width:2;
  stroke-linecap:round;
}
.light-mode .theme-icon .sun{
  display:none;
}
.light-mode .theme-icon .moon{
  display:block;
}
@media(max-width:620px){
  .nav-toggle{display:flex}
  .nav-links{
    display:none;position:absolute;top:100%;left:0;right:0;
    background:var(--bg2);border-bottom:1px solid var(--border);
    flex-direction:column;align-items:flex-start;
    padding:1rem 1.5rem;gap:1rem;
  }
  .nav-links.open{display:flex}
}

#hero{
  min-height:100vh;display:flex;align-items:center;
  padding:7rem 0 4rem;position:relative;overflow:hidden;
}
.hero-grid{
  position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(var(--border) 1px,transparent 1px),
    linear-gradient(90deg,var(--border) 1px,transparent 1px);
  background-size:44px 44px;
  -webkit-mask-image:radial-gradient(ellipse 80% 80% at 50% 50%,#000 40%,transparent 100%);
  mask-image:radial-gradient(ellipse 80% 80% at 50% 50%,#000 40%,transparent 100%);
  opacity:.22;
  isolation:isolate;
  contain:strict;
}
.hero-glow{
  position:absolute;top:-180px;right:-180px;
  width:520px;height:520px;border-radius:50%;
  background:radial-gradient(circle,rgba(52,211,153,.1) 0%,transparent 70%);
  pointer-events:none;contain:strict;
}
.hero-glow2{
  position:absolute;bottom:-120px;left:-120px;
  width:400px;height:400px;border-radius:50%;
  background:radial-gradient(circle,rgba(34,211,238,.07) 0%,transparent 70%);
  pointer-events:none;contain:strict;
}
.hero-content{position:relative;z-index:1}
.hero-inner{
  display:grid;grid-template-columns:minmax(0,1fr) auto;gap:2rem;align-items:center;
}
.hero-text{max-width:640px}
.hero-media{display:flex;justify-content:center}
.hero-media img{
  width:320px;max-width:100%;aspect-ratio:1/1;object-fit:cover;
  border-radius:50%;border:1px solid var(--border);
  box-shadow:0 28px 80px rgba(0,0,0,.22);
}
.hero-tag{
  display:inline-flex;align-items:center;gap:.5rem;
  font-family:var(--font-mono);font-size:.75rem;
  color:var(--accent);border:1px solid rgba(52,211,153,.3);
  padding:.3rem .75rem;border-radius:20px;margin-bottom:1.5rem;
  background:rgba(52,211,153,.07);
}
.hero-tag::before{content:"●";font-size:.48rem;animation:blink 2s infinite}
@keyframes blink{0%,100%{opacity:1}50%{opacity:.15}}
h1{
  font-size:clamp(2.4rem,6.5vw,4rem);font-weight:800;
  line-height:1.05;letter-spacing:-.03em;margin-bottom:.5rem;
}
h1 .name-accent{
  color:transparent;
  background:linear-gradient(135deg,var(--accent),var(--accent2));
  -webkit-background-clip:text;background-clip:text;
}
.hero-role{
  font-family:var(--font-mono);font-size:clamp(.85rem,2.2vw,1rem);
  color:var(--text-muted);margin-bottom:1.5rem;
}
.hero-role .dot{color:var(--accent2);margin:0 .4rem}
.hero-summary{
  max-width:560px;font-size:.97rem;color:var(--text-muted);
  line-height:1.8;margin-bottom:2rem;
}
.hero-cta{display:flex;gap:.85rem;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;gap:.45rem;
  padding:.6rem 1.35rem;border-radius:var(--radius);
  font-family:var(--font-mono);font-size:.78rem;font-weight:700;
  letter-spacing:.04em;cursor:pointer;border:1px solid transparent;
  transition:transform .18s,opacity .18s,background .18s,border-color .18s;
  will-change:transform;
}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:var(--accent);color:#050e0a;border-color:var(--accent)}
.btn-primary:hover{background:#5fe8b0;opacity:1}
.btn-outline{background:transparent;color:var(--accent);border-color:var(--accent)}
.btn-outline:hover{background:rgba(52,211,153,.1);opacity:1}
.hero-contacts{
  margin-top:2.5rem;display:flex;gap:1.25rem;flex-wrap:wrap;align-items:center;
}
.contact-chip{
  font-family:var(--font-mono);font-size:.72rem;
  color:var(--text-muted);display:flex;align-items:center;gap:.4rem;
  transition:color .18s;
}
.contact-chip:hover{color:var(--accent)}
.contact-chip svg{width:13px;height:13px;flex-shrink:0}

section{padding:5rem 0;contain:layout}
.section-label{
  font-family:var(--font-mono);font-size:.72rem;
  color:var(--accent);letter-spacing:.12em;text-transform:uppercase;
  margin-bottom:.5rem;display:flex;align-items:center;gap:.6rem;
}
.section-label::after{
  content:"";flex:1;height:1px;
  background:linear-gradient(90deg,var(--border-hi),transparent);
}
h2{
  font-size:clamp(1.6rem,4vw,2.1rem);font-weight:800;
  margin-bottom:2.5rem;letter-spacing:-.025em;
}

#about .about-grid{display:grid;grid-template-columns:1fr 1fr;gap:1.25rem}
@media(max-width:620px){#about .about-grid{grid-template-columns:1fr}}
.about-card{
  background:var(--bg2);border:1px solid var(--border);
  border-radius:var(--radius);padding:1.5rem;
  transition:border-color .18s;
}
.about-card:hover{border-color:var(--border-hi)}
.about-card h3{
  font-size:.82rem;font-weight:700;margin-bottom:.7rem;
  color:var(--accent2);font-family:var(--font-mono);letter-spacing:.06em;text-transform:uppercase;
}
.about-card p{font-size:.9rem;color:var(--text-muted);line-height:1.75}

.skills-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:1rem}
.skill-card{
  background:var(--bg2);border:1px solid var(--border);
  border-radius:var(--radius);padding:1.2rem 1.35rem;
  transition:border-color .18s,transform .18s;
  will-change:transform;
}
.skill-card:hover{border-color:var(--accent);transform:translateY(-2px)}
.skill-card h3{
  font-family:var(--font-mono);font-size:.72rem;
  color:var(--accent);letter-spacing:.09em;text-transform:uppercase;
  margin-bottom:.75rem;
}
.tags{display:flex;flex-wrap:wrap;gap:.35rem}
.tag{
  font-family:var(--font-mono);font-size:.7rem;
  background:var(--tag-bg);color:var(--tag-text);
  padding:.22rem .55rem;border-radius:4px;
  border:1px solid var(--tag-border);
}

.projects-list{display:flex;flex-direction:column;gap:1.25rem}
.project-card{
  background:var(--bg2);border:1px solid var(--border);
  border-radius:var(--radius);padding:1.65rem;
  position:relative;overflow:hidden;
  transition:border-color .22s,transform .22s;
  will-change:transform;
}
.project-card::before{
  content:"";position:absolute;top:0;left:0;
  width:3px;height:100%;
  background:linear-gradient(180deg,var(--accent),var(--accent2));
  transform:scaleY(0);transform-origin:top;
  transition:transform .28s;
}
.project-card:hover::before{transform:scaleY(1)}
.project-card:hover{border-color:rgba(52,211,153,.35);transform:translateX(3px)}
.project-header{display:flex;justify-content:space-between;align-items:flex-start;gap:1rem;flex-wrap:wrap;margin-bottom:.45rem}
.project-title{font-size:1.05rem;font-weight:700}
.project-badge{
  font-family:var(--font-mono);font-size:.65rem;
  color:var(--accent2);border:1px solid rgba(34,211,238,.28);
  padding:.18rem .5rem;border-radius:4px;background:rgba(34,211,238,.07);white-space:nowrap;
}
.project-desc{font-size:.88rem;color:var(--text-muted);margin-bottom:.9rem;line-height:1.7}
.project-bullets{margin-bottom:.9rem;display:flex;flex-direction:column;gap:.28rem}
.project-bullets li{
  font-size:.84rem;color:var(--text-muted);
  padding-left:1rem;position:relative;
}
.project-bullets li::before{
  content:"▸";position:absolute;left:0;color:var(--accent);font-size:.68rem;top:.06rem;
}
.project-footer{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:.75rem}
.project-actions{display:flex;flex-wrap:wrap;gap:.75rem;align-items:center}
.project-link{
  font-family:var(--font-mono);font-size:.72rem;
  color:var(--accent2);display:flex;align-items:center;gap:.32rem;
  transition:opacity .18s;
}
.project-link:hover{opacity:.72}
.project-link svg{width:13px;height:13px}

.timeline{position:relative;padding-left:1.5rem}
.timeline::before{
  content:"";position:absolute;left:0;top:.4rem;bottom:.4rem;
  width:1px;background:var(--border);
}
.timeline-item{position:relative;margin-bottom:2rem}
.timeline-item::before{
  content:"";position:absolute;left:-1.875rem;top:.45rem;
  width:9px;height:9px;border-radius:50%;
  background:var(--accent);border:2px solid var(--bg);
  box-shadow:0 0 0 3px rgba(52,211,153,.18);
}
.timeline-title{font-size:1rem;font-weight:700}
.timeline-org{font-family:var(--font-mono);font-size:.75rem;color:var(--accent2);margin:.2rem 0}
.timeline-date{font-family:var(--font-mono);font-size:.7rem;color:var(--text-muted);margin-bottom:.7rem}
.timeline-bullets{display:flex;flex-direction:column;gap:.28rem}
.timeline-bullets li{font-size:.87rem;color:var(--text-muted);padding-left:1rem;position:relative}
.timeline-bullets li::before{content:"–";position:absolute;left:0;color:var(--accent)}

.edu-grid{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
@media(max-width:600px){.edu-grid{grid-template-columns:1fr}}
.edu-card,.cert-card{
  background:var(--bg2);border:1px solid var(--border);
  border-radius:var(--radius);padding:1.5rem;
  transition:border-color .18s;
}
.edu-card:hover,.cert-card:hover{border-color:var(--border-hi)}
.edu-icon{font-size:1.3rem;margin-bottom:.7rem}
.edu-degree,.cert-name{font-size:.95rem;font-weight:700;margin-bottom:.25rem}
.edu-school{font-family:var(--font-mono);font-size:.75rem;color:var(--accent);margin-bottom:.2rem;line-height:1.5}
.edu-date{font-family:var(--font-mono);font-size:.7rem;color:var(--text-muted)}
.cert-desc{font-size:.84rem;color:var(--text-muted);line-height:1.65}
.cert-list{display:grid;gap:.85rem;margin-top:1rem}
.cert-link{
  display:inline-flex;align-items:center;gap:.4rem;
  color:var(--accent2);font-family:var(--font-mono);font-size:.82rem;
}
.cert-link:hover{opacity:.82}

.lang-grid{display:flex;gap:1rem;flex-wrap:wrap}
.lang-card{
  background:var(--bg2);border:1px solid var(--border);
  border-radius:var(--radius);padding:1rem 1.5rem;
  display:flex;align-items:center;gap:.85rem;
  transition:border-color .18s;
}
.lang-card:hover{border-color:var(--border-hi)}
.lang-name{font-weight:700;font-size:.92rem}
.lang-level{font-family:var(--font-mono);font-size:.7rem;color:var(--text-muted);margin-top:.08rem}
.lang-badge{font-family:var(--font-mono);font-size:.66rem;padding:.18rem .48rem;border-radius:4px}
.lang-badge.native{background:rgba(52,211,153,.1);color:var(--accent);border:1px solid rgba(52,211,153,.25)}
.lang-badge.intermediate{background:rgba(34,211,238,.08);color:var(--accent2);border:1px solid rgba(34,211,238,.22)}

#contact{text-align:center}
#contact .container{max-width:700px}
#contact p{color:var(--text-muted);margin-bottom:2rem;font-size:.93rem}
.contact-links{display:flex;justify-content:center;gap:.85rem;flex-wrap:wrap}
.contact-btn{
  display:inline-flex;align-items:center;gap:.45rem;
  background:var(--bg2);border:1px solid var(--border);
  color:var(--text);padding:.65rem 1.2rem;border-radius:var(--radius);
  font-family:var(--font-mono);font-size:.75rem;
  transition:border-color .18s,color .18s,transform .18s;
  will-change:transform;
}
.contact-btn:hover{border-color:var(--accent);color:var(--accent);transform:translateY(-1px);opacity:1}
.contact-btn svg{width:14px;height:14px;flex-shrink:0}

.contact-form{
  display:grid;gap:1rem;text-align:left;margin:0 auto;
}
.form-field{display:flex;flex-direction:column;gap:.45rem}
.form-field label{font-size:.82rem;color:var(--text-muted);font-family:var(--font-mono)}
.form-field input,
.form-field textarea{
  background:var(--bg2);border:1px solid var(--border);
  color:var(--text);padding:.95rem 1rem;border-radius:12px;
  font:inherit;resize:vertical;
}
.form-field input:focus,
.form-field textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 4px rgba(52,211,153,.08)}
.form-field.error input,
.form-field.error textarea{border-color:#ef4444;box-shadow:0 0 0 4px rgba(239,68,68,.08)}
.form-note{font-size:.83rem;color:var(--text-muted);line-height:1.6;margin-top:.5rem}

footer{
  border-top:1px solid var(--border);padding:1.5rem 0;
  text-align:center;font-family:var(--font-mono);font-size:.7rem;color:var(--text-muted);
}

.reveal{
  opacity:0;
  transform:translate3d(0,20px,0);
  transition:opacity .5s ease,transform .5s ease;
}
.reveal.visible{opacity:1;transform:translate3d(0,0,0)}
.reveal:nth-child(2){transition-delay:.07s}
.reveal:nth-child(3){transition-delay:.14s}
.reveal:nth-child(4){transition-delay:.21s}

@media(prefers-reduced-motion:reduce){
  *{animation:none!important;transition-duration:0.01ms!important}
  .reveal{opacity:1;transform:none}
}

@media(max-width:900px){
  .hero-inner{grid-template-columns:1fr}
}

/* Contact Form Validation Styles */
.input-group input.error,
.input-group textarea.error {
    border-color: #ff4d4d !important;
    outline: none;
    animation: shake 0.4s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    50% { transform: translateX(5px); }
    75% { transform: translateX(-5px); }
}