/* ==========================================================================
   Portfolio — modern dark tech theme
   Single stylesheet. No framework, no build step.
   ========================================================================== */

/* ---------- Design tokens ---------- */
:root {
  --bg:            #0a0c10;
  --bg-elev:       #11141b;
  --bg-elev-2:     #171b24;
  --border:        #232834;
  --border-strong: #333a4a;

  --text:          #e6e9ef;
  --text-muted:    #9aa3b2;
  --text-dim:      #6b7484;

  --accent:        #5eead4;
  --accent-2:      #818cf8;
  --accent-glow:   rgba(94, 234, 212, 0.14);

  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               Helvetica, Arial, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, "SF Mono",
               Menlo, Consolas, monospace;

  --maxw: 1080px;
  --radius: 14px;
  --radius-sm: 8px;

  --shadow: 0 1px 2px rgba(0,0,0,.4), 0 8px 24px rgba(0,0,0,.28);

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

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16.5px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; display: block; }
a { color: var(--accent); text-decoration: none; transition: color .18s var(--ease); }
a:hover { color: #fff; }
h1, h2, h3, h4 { line-height: 1.2; letter-spacing: -0.02em; margin: 0 0 .6em; font-weight: 650; }
h1 { font-size: clamp(2.1rem, 5vw, 3.2rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); }
h3 { font-size: 1.15rem; }
p  { margin: 0 0 1.1em; color: var(--text-muted); }
ul, ol { color: var(--text-muted); }
code, pre, .mono { font-family: var(--font-mono); font-size: .875em; }

/* ---------- Ambient background glow ---------- */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(700px 420px at 12% -8%,  rgba(94,234,212,.10), transparent 60%),
    radial-gradient(620px 400px at 92% 4%,   rgba(129,140,248,.10), transparent 60%);
}
body > * { position: relative; z-index: 1; }

/* ---------- Layout ---------- */
.wrap { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: 24px; }
.section { padding: 84px 0; }
.section--tight { padding: 56px 0; }
.divider { height: 1px; background: var(--border); border: 0; margin: 0; }

/* ---------- Header / nav ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: rgba(10,12,16,.72);
  border-bottom: 1px solid var(--border);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 66px; }
.brand {
  font-family: var(--font-mono);
  font-size: .95rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -.01em;
}
.brand span { color: var(--accent); }
.nav-links { display: flex; gap: 30px; align-items: center; list-style: none; margin: 0; padding: 0; }
.nav-links a {
  color: var(--text-muted);
  font-size: .92rem;
  font-weight: 500;
  position: relative;
  padding: 4px 0;
}
.nav-links a::after {
  content: ""; position: absolute; left: 0; bottom: 0;
  width: 0; height: 1.5px; background: var(--accent);
  transition: width .22s var(--ease);
}
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--text); }
.nav-links a:hover::after, .nav-links a[aria-current="page"]::after { width: 100%; }

.nav-toggle {
  display: none; background: none; border: 1px solid var(--border);
  border-radius: var(--radius-sm); color: var(--text);
  width: 40px; height: 36px; cursor: pointer; align-items: center; justify-content: center;
}
.nav-toggle span { display: block; width: 17px; height: 1.5px; background: currentColor; position: relative; }
.nav-toggle span::before, .nav-toggle span::after {
  content: ""; position: absolute; left: 0; width: 17px; height: 1.5px; background: currentColor;
}
.nav-toggle span::before { top: -5.5px; } .nav-toggle span::after { top: 5.5px; }

@media (max-width: 760px) {
  .nav-toggle { display: flex; }
  .nav-links {
    position: absolute; top: 66px; left: 0; right: 0;
    flex-direction: column; align-items: flex-start; gap: 0;
    background: var(--bg-elev); border-bottom: 1px solid var(--border);
    padding: 8px 24px 18px; display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links li { width: 100%; }
  .nav-links a { display: block; padding: 11px 0; font-size: 1rem; }
}

/* ---------- Hero ---------- */
.hero { padding: 108px 0 76px; }
.eyebrow {
  font-family: var(--font-mono); font-size: .76rem; letter-spacing: .16em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 20px;
  display: flex; align-items: center; gap: 10px;
}
.eyebrow::before {
  content: ""; width: 7px; height: 7px; border-radius: 50%;
  background: var(--accent); box-shadow: 0 0 0 4px var(--accent-glow);
}
.hero h1 { max-width: 16ch; margin-bottom: .35em; }
.hero .lede { font-size: 1.1rem; max-width: 60ch; color: var(--text-muted); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 20px; border-radius: 999px;
  font-size: .92rem; font-weight: 550; line-height: 1;
  border: 1px solid var(--border-strong);
  color: var(--text); background: var(--bg-elev);
  transition: all .2s var(--ease); cursor: pointer;
}
.btn:hover { color: var(--text); border-color: var(--accent); transform: translateY(-1px); }
.btn--primary {
  background: var(--accent); color: #06251f; border-color: var(--accent);
  box-shadow: 0 0 0 0 var(--accent-glow);
}
.btn--primary:hover { color: #06251f; box-shadow: 0 0 0 6px var(--accent-glow); }
.btn--ghost { background: transparent; }

/* ---------- Section headings ---------- */
.section-head { display: flex; align-items: baseline; justify-content: space-between; gap: 20px; margin-bottom: 34px; }
.section-head h2 { margin: 0; }
.section-head a { font-size: .9rem; font-family: var(--font-mono); white-space: nowrap; }

/* ---------- Cards / grid ---------- */
.grid { display: grid; gap: 18px; }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 860px) { .grid--3 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 620px) { .grid--2, .grid--3 { grid-template-columns: 1fr; } }

.card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: border-color .22s var(--ease), transform .22s var(--ease), background .22s var(--ease);
  display: flex; flex-direction: column;
}
.card:hover { border-color: var(--border-strong); background: var(--bg-elev-2); transform: translateY(-3px); }
.card h3 { margin-bottom: .45em; color: var(--text); }
.card h3 a { color: inherit; }
.card p { font-size: .95rem; margin-bottom: 1em; }
.card-foot { margin-top: auto; padding-top: 6px; }

/* ---------- Meta / tags ---------- */
.meta {
  font-family: var(--font-mono); font-size: .74rem; letter-spacing: .06em;
  text-transform: uppercase; color: var(--text-dim);
  display: flex; align-items: center; gap: 10px; margin-bottom: 14px; flex-wrap: wrap;
}
.tag {
  display: inline-block; padding: 3px 10px; border-radius: 999px;
  border: 1px solid var(--border-strong); background: rgba(255,255,255,.02);
  font-family: var(--font-mono); font-size: .72rem; letter-spacing: .05em;
  color: var(--text-muted); text-transform: none;
}
.tag--tech   { color: var(--accent);   border-color: rgba(94,234,212,.35); }
.tag--travel { color: var(--accent-2); border-color: rgba(129,140,248,.35); }
.tags { display: flex; flex-wrap: wrap; gap: 7px; }

/* ---------- Post list (blog index) ---------- */
.post-list { list-style: none; margin: 0; padding: 0; }
.post-item { border-bottom: 1px solid var(--border); }
.post-item a.post-link {
  display: grid; grid-template-columns: 130px 1fr; gap: 26px;
  padding: 26px 8px; color: inherit; border-radius: var(--radius-sm);
  transition: background .2s var(--ease), padding-left .2s var(--ease);
}
.post-item a.post-link:hover { background: var(--bg-elev); padding-left: 16px; }
.post-item .date { font-family: var(--font-mono); font-size: .8rem; color: var(--text-dim); padding-top: 4px; }
.post-item h3 { margin-bottom: .3em; font-size: 1.18rem; }
.post-item p { margin: 0 0 .7em; font-size: .95rem; }
@media (max-width: 620px) {
  .post-item a.post-link { grid-template-columns: 1fr; gap: 8px; }
}

/* ---------- Filter bar ---------- */
.filters { display: flex; gap: 9px; flex-wrap: wrap; margin-bottom: 8px; }
.filter {
  padding: 7px 15px; border-radius: 999px; cursor: pointer;
  border: 1px solid var(--border); background: transparent;
  color: var(--text-muted); font-family: var(--font-mono); font-size: .78rem;
  transition: all .18s var(--ease);
}
.filter:hover { color: var(--text); border-color: var(--border-strong); }
.filter.is-active { background: var(--accent); border-color: var(--accent); color: #06251f; }

/* ---------- CV / timeline ---------- */
.cv-block { margin-bottom: 52px; }
.cv-block > h2 {
  font-size: .82rem; font-family: var(--font-mono); text-transform: uppercase;
  letter-spacing: .16em; color: var(--accent); padding-bottom: 12px;
  border-bottom: 1px solid var(--border); margin-bottom: 26px;
}
.entry { display: grid; grid-template-columns: 190px 1fr; gap: 26px; padding: 20px 0; }
.entry + .entry { border-top: 1px solid var(--border); }
.entry .when { font-family: var(--font-mono); font-size: .82rem; color: var(--text-dim); padding-top: 3px; }
.entry h3 { margin-bottom: .15em; }
.entry .where { color: var(--accent); font-size: .93rem; margin-bottom: .7em; }
.entry ul { margin: 0; padding-left: 18px; font-size: .95rem; }
.entry li { margin-bottom: .35em; }
@media (max-width: 700px) { .entry { grid-template-columns: 1fr; gap: 6px; } }

.skill-group { margin-bottom: 20px; }
.skill-group h4 { margin: 0 0 10px; font-size: .88rem; color: var(--text); font-weight: 600; }

/* ---------- Article (blog post) ---------- */
.article { max-width: 720px; margin-inline: auto; }
.article h1 { font-size: clamp(1.9rem, 4vw, 2.7rem); }
.article > p { font-size: 1.05rem; }
.article h2 { margin-top: 2em; }
.article img { border-radius: var(--radius); border: 1px solid var(--border); margin: 2em 0; }
.article blockquote {
  margin: 1.8em 0; padding: 2px 0 2px 22px;
  border-left: 2px solid var(--accent); color: var(--text);
  font-size: 1.05rem;
}
.article pre {
  background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 18px 20px; overflow-x: auto;
  color: var(--text); line-height: 1.6;
}
.article :not(pre) > code {
  background: var(--bg-elev-2); border: 1px solid var(--border);
  padding: 2px 6px; border-radius: 5px; color: var(--accent);
}
.article hr { border: 0; border-top: 1px solid var(--border); margin: 2.6em 0; }

.back-link { font-family: var(--font-mono); font-size: .85rem; display: inline-block; margin-bottom: 28px; }

/* ---------- Contact ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 44px; }
@media (max-width: 780px) { .contact-grid { grid-template-columns: 1fr; gap: 30px; } }
.field { margin-bottom: 16px; }
.field label { display: block; font-size: .82rem; font-family: var(--font-mono);
  text-transform: uppercase; letter-spacing: .1em; color: var(--text-dim); margin-bottom: 7px; }
.field input, .field textarea {
  width: 100%; padding: 11px 14px; font: inherit; font-size: .95rem;
  color: var(--text); background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: var(--radius-sm); transition: border-color .18s var(--ease);
}
.field input:focus, .field textarea:focus { outline: none; border-color: var(--accent); }
.field textarea { min-height: 140px; resize: vertical; }

.link-list { list-style: none; margin: 0; padding: 0; }
.link-list li { border-bottom: 1px solid var(--border); }
.link-list a {
  display: flex; justify-content: space-between; align-items: center; gap: 14px;
  padding: 15px 4px; color: var(--text); font-size: .97rem;
}
.link-list a:hover { color: var(--accent); }
.link-list .label { font-family: var(--font-mono); font-size: .78rem;
  color: var(--text-dim); text-transform: uppercase; letter-spacing: .1em; }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--border); padding: 34px 0; margin-top: 40px; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; gap: 18px; flex-wrap: wrap; }
.site-footer p { margin: 0; font-size: .87rem; color: var(--text-dim); }
.footer-links { display: flex; gap: 20px; }
.footer-links a { font-size: .87rem; color: var(--text-muted); }

/* ---------- Utilities ---------- */
.muted { color: var(--text-muted); }
.center { text-align: center; }
.narrow { max-width: 680px; }
.stack-sm > * + * { margin-top: 10px; }

/* ---------- Scroll reveal ---------- */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity .6s var(--ease), transform .6s var(--ease); }
.reveal.is-visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------- Focus ---------- */
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

/* ---------- Selection & scrollbar ---------- */
::selection { background: rgba(94,234,212,.28); color: #fff; }
::-webkit-scrollbar { width: 11px; height: 11px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: #262c38; border-radius: 6px; border: 3px solid var(--bg); }
::-webkit-scrollbar-thumb:hover { background: #333a4a; }