/* =========================================================
   DESIGN TOKENS
   ========================================================= */
:root{
  --bg:            #0B0E14;
  --bg-elevated:   #10141D;
  --bg-card:       #131826;
  --line:          #212838;

  --text-primary:  #EDEFF5;
  --text-secondary:#8891A6;
  --text-tertiary: #5A6378;

  --accent-blue:   #3B82F6;
  --accent-cyan:   #22D3EE;
  --accent-violet: #8B5CF6;
  --accent-gradient: linear-gradient(90deg, var(--accent-blue), var(--accent-cyan));

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

  --radius: 14px;
  --radius-sm: 8px;
  --container: 1120px;

  --ease: cubic-bezier(.22,.61,.36,1);
}

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

html{ scroll-behavior:smooth; }

body{
  background: var(--bg);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a{ color:inherit; text-decoration:none; }
ul{ list-style:none; }
img{ max-width:100%; display:block; }

/* =========================================================
   BACKGROUND CANVAS
   ========================================================= */
#graph-bg{
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  background: var(--bg);
}

/* soft vignette so text stays legible over the graph */
.bg-vignette{
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: radial-gradient(ellipse 90% 60% at 50% 0%, rgba(11,14,20,0) 0%, rgba(11,14,20,.55) 65%, rgba(11,14,20,.92) 100%);
}

/* =========================================================
   LAYOUT
   ========================================================= */
.wrap{
  position: relative;
  z-index: 2;
}

.container{
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 32px;
}

/* =========================================================
   NAV
   ========================================================= */
.nav{
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(16px) saturate(140%);
  background: rgba(11,14,20,.6);
  border-bottom: 1px solid var(--line);
}

.nav-inner{
  max-width: var(--container);
  margin: 0 auto;
  padding: 18px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.nav-logo{
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: -.01em;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
  white-space: nowrap;
}

.nav-logo .dot{
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent-gradient);
  box-shadow: 0 0 12px var(--accent-cyan);
  flex-shrink: 0;
}

/* right-hand cluster: links + CV + lang + hamburger, so it can wrap as one unit on mobile */
.nav-right{
  display: flex;
  align-items: center;
  gap: 20px;
  flex-shrink: 0;
}

.nav-links{
  display: flex;
  gap: 36px;
  flex-shrink: 0;
}

.nav-links a{
  font-size: .92rem;
  color: var(--text-secondary);
  transition: color .25s var(--ease);
  position: relative;
  white-space: nowrap;
}

.nav-links a:hover,
.nav-links a.active{
  color: var(--text-primary);
}

.nav-links a.active::after{
  content:"";
  position:absolute;
  left:0; right:0; bottom:-6px;
  height:2px;
  background: var(--accent-gradient);
  border-radius: 2px;
}

.nav-toggle{ display:none; background:none; border:none; color:var(--text-primary); font-size:1.5rem; cursor:pointer; flex-shrink:0; line-height:1; }

.nav-cv-mobile{ display:none; }

@media (max-width: 800px){
  .nav-inner{ padding: 14px 20px; }

  /* Only logo + hamburger stay in the top bar; everything else moves into the dropdown */
  .nav-right > .btn-primary,
  .nav-right > #lang-toggle{
    display: none;
  }

  .nav-links{
    position: fixed;
    top: var(--nav-h, 60px);
    left:0; right:0;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    align-items: flex-start;
    padding: 20px;
    gap: 18px;
    max-height: calc(100vh - var(--nav-h, 60px));
    overflow-y: auto;
    transform: translateY(-150vh);
    transition: transform .3s var(--ease);
  }
  .nav-links.open{ transform: translateY(0); }
  .nav-toggle{ display:block; }

  /* CV + language controls reappear as normal rows inside the open mobile menu */
  .nav-cv-mobile{
    display: flex;
    gap: 14px;
    align-items: center;
    padding-top: 14px;
    border-top: 1px solid var(--line);
    width: 100%;
  }
  .nav-cv-mobile .btn{ flex-shrink:0; }
}

/* =========================================================
   TYPOGRAPHY
   ========================================================= */
.eyebrow{
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--accent-cyan);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
}
.eyebrow::before{
  content:"";
  width: 14px; height: 1px;
  background: var(--accent-cyan);
}

h1, h2, h3{
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -.02em;
  line-height: 1.1;
}

h1{ font-size: clamp(2.6rem, 5.5vw, 4.6rem); }
h2{ font-size: clamp(1.9rem, 3.4vw, 2.7rem); margin-bottom: 16px; }
h3{ font-size: 1.25rem; }

p{ color: var(--text-secondary); }

.lead{
  font-size: clamp(1.05rem, 1.4vw, 1.25rem);
  color: var(--text-secondary);
  max-width: 620px;
}

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

/* =========================================================
   BUTTONS
   ========================================================= */
.btn{
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 26px;
  border-radius: 100px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: .92rem;
  cursor: pointer;
  transition: transform .25s var(--ease), box-shadow .25s var(--ease), background .25s var(--ease), border-color .25s var(--ease);
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary{
  background: var(--accent-gradient);
  color: #06090F;
}
.btn-primary:hover{
  transform: translateY(-2px);
  box-shadow: 0 10px 30px -8px rgba(59,130,246,.55);
}

.btn-ghost{
  background: rgba(255,255,255,.03);
  border-color: var(--line);
  color: var(--text-primary);
}
.btn-ghost:hover{
  background: rgba(255,255,255,.06);
  border-color: var(--accent-blue);
  transform: translateY(-2px);
}

.btn-sm{ padding: 9px 18px; font-size: .82rem; }

/* =========================================================
   HERO
   ========================================================= */
.hero{
  min-height: 92vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 140px 0 80px;
}

.hero-actions{
  display: flex;
  gap: 14px;
  margin-top: 36px;
  flex-wrap: wrap;
}

.hero-meta{
  display: flex;
  gap: 40px;
  margin-top: 72px;
  flex-wrap: wrap;
}

.hero-meta div{ border-left: 1px solid var(--line); padding-left: 16px; }
.hero-meta .num{
  font-family: var(--font-mono);
  font-size: 1.6rem;
  color: var(--text-primary);
  display:block;
}
.hero-meta .label{
  font-size: .78rem;
  color: var(--text-tertiary);
}

/* =========================================================
   SECTION
   ========================================================= */
.section{
  padding: 100px 0;
  border-top: 1px solid var(--line);
}

.section-head{
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 24px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

/* =========================================================
   CARDS - generic grid
   ========================================================= */
.grid{
  display: grid;
  gap: 20px;
}
.grid-3{ grid-template-columns: repeat(3, 1fr); }
.grid-2{ grid-template-columns: repeat(2, 1fr); }

@media (max-width: 900px){
  .grid-3{ grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px){
  .grid-3, .grid-2{ grid-template-columns: 1fr; }
}

.card{
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
  transition: border-color .25s var(--ease), transform .25s var(--ease), background .25s var(--ease);
}

.card:hover{
  border-color: var(--accent-blue);
  transform: translateY(-4px);
  background: var(--bg-elevated);
}

.tag{
  font-family: var(--font-mono);
  font-size: .72rem;
  padding: 4px 10px;
  border-radius: 100px;
  border: 1px solid var(--line);
  color: var(--text-secondary);
  display: inline-block;
}

.tag-row{
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin: 14px 0;
}

/* =========================================================
   TIMELINE (about page)
   ========================================================= */
.timeline{
  position: relative;
  padding-left: 32px;
  border-left: 1px solid var(--line);
}
.timeline-item{
  position: relative;
  padding-bottom: 44px;
}
.timeline-item:last-child{ padding-bottom: 0; }
.timeline-item::before{
  content:"";
  position:absolute;
  left:-37px; top: 4px;
  width: 12px; height:12px;
  border-radius:50%;
  background: var(--bg);
  border: 2px solid var(--accent-cyan);
  box-shadow: 0 0 12px rgba(34,211,238,.5);
}
.timeline-item .period{
  font-family: var(--font-mono);
  font-size: .78rem;
  color: var(--accent-cyan);
  margin-bottom: 6px;
  display: block;
}

/* =========================================================
   NOTES / FILTER PILLS
   ========================================================= */
.filters{
  display: flex;
  gap: 10px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}
.filter-pill{
  font-family: var(--font-mono);
  font-size: .82rem;
  padding: 8px 18px;
  border-radius: 100px;
  border: 1px solid var(--line);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all .2s var(--ease);
  background: transparent;
}
.filter-pill.active{
  color: var(--bg);
  background: var(--accent-gradient);
  border-color: transparent;
}
.filter-pill:hover:not(.active){ border-color: var(--accent-blue); color: var(--text-primary); }

.note-card{
  display:flex;
  flex-direction: column;
  gap: 12px;
}
.note-code{
  font-family: var(--font-mono);
  color: var(--accent-cyan);
  font-size: .82rem;
}
.note-card .btn{ margin-top: auto; align-self: flex-start; }

/* =========================================================
   SKILL TAGS (about)
   ========================================================= */
.skill-cloud{
  display:flex; flex-wrap:wrap; gap:10px; margin-top: 24px;
}

/* =========================================================
   CONTACT FORM
   ========================================================= */
.form-grid{
  display: grid;
  gap: 18px;
  max-width: 560px;
}
label{
  display:block;
  font-size: .82rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
  font-family: var(--font-mono);
}
input, textarea{
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 13px 16px;
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: .95rem;
  transition: border-color .2s var(--ease);
}
input:focus, textarea:focus{
  outline: none;
  border-color: var(--accent-blue);
}
textarea{ resize: vertical; min-height: 140px; }

.contact-links{
  display:flex; flex-direction:column; gap: 18px;
}
.contact-link{
  display:flex; align-items:center; gap:14px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color .2s var(--ease), background .2s var(--ease);
}
.contact-link:hover{ border-color: var(--accent-blue); background: var(--bg-card); }

.form-status{
  font-family: var(--font-mono);
  font-size: .85rem;
  min-height: 20px;
}
.form-status.ok{ color: var(--accent-cyan); }
.form-status.err{ color: #F87171; }

/* =========================================================
   FOOTER
   ========================================================= */
.footer{
  border-top: 1px solid var(--line);
  padding: 48px 0;
}
.footer-inner{
  display:flex;
  justify-content: space-between;
  align-items:center;
  flex-wrap: wrap;
  gap: 16px;
}
.footer-links{ display:flex; gap: 24px; }
.footer-links a{ color: var(--text-secondary); font-size: .88rem; transition: color .2s; }
.footer-links a:hover{ color: var(--text-primary); }
.footer small{ color: var(--text-tertiary); font-size: .82rem; }

/* =========================================================
   REVEAL ON SCROLL
   ========================================================= */
.reveal{
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
}
.reveal.in{ opacity: 1; transform: translateY(0); }

/* =========================================================
   SMALL SCREEN FIXES (phones)
   ========================================================= */
@media (max-width: 640px){
  .container{ padding: 0 20px; }

  .hero{
    min-height: auto;
    padding: 40px 0 60px;
  }
  .hero[style*="padding-top"]{ padding-top: 110px !important; }

  h1{ font-size: clamp(2rem, 9vw, 2.8rem); }
  h2{ font-size: clamp(1.5rem, 6vw, 2rem); }

  .hero-actions{ flex-direction: column; align-items: stretch; }
  .hero-actions .btn{ justify-content: center; }

  .hero-meta{ gap: 24px 28px; margin-top: 44px; }

  .section{ padding: 60px 0; }

  .card{ padding: 22px; }

  .grid-3, .grid-2{ gap: 16px; }

  .about-header-flex{ flex-direction: column; align-items: flex-start !important; gap: 20px !important; }
  .about-header-flex img{ width: 96px !important; height: 96px !important; }

  .timeline{ padding-left: 24px; }
  .timeline-item::before{ left: -29px; }

  .footer-inner{ flex-direction: column; align-items: flex-start; }

  .contact-links{ margin-top: 8px; }
}

@media (prefers-reduced-motion: reduce){
  .reveal{ opacity:1; transform:none; transition:none; }
  html{ scroll-behavior:auto; }
}

/* focus visibility */
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible{
  outline: 2px solid var(--accent-cyan);
  outline-offset: 2px;
}