/* ============================================================
   Dmytro Dmytrush — Portfolio
   Dark technical aesthetic. Hand-built, no template.
   ============================================================ */

:root {
  --bg:        #0d1117;
  --bg-soft:   #161b22;
  --bg-card:   #12171f;
  --border:    #232b36;
  --border-hi: #30363d;
  --fg:        #e6edf3;
  --fg-dim:    #9aa7b4;
  --fg-mute:   #6e7b8a;
  --accent:    #4dd0a7;   /* teal-green (terraform/k8s vibe) */
  --accent-2:  #58a6ff;   /* blue */
  --accent-3:  #f0a868;   /* amber */
  --danger:    #ff6b6b;
  --mono: "SF Mono", "JetBrains Mono", "Fira Code", ui-monospace, Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --maxw: 960px;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  background-image:
    radial-gradient(circle at 15% -10%, rgba(77,208,167,0.08), transparent 40%),
    radial-gradient(circle at 90% 0%, rgba(88,166,255,0.07), transparent 35%);
  background-attachment: fixed;
}

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

a { color: var(--accent-2); text-decoration: none; transition: color .15s ease; }
a:hover { color: var(--accent); }

/* ---------- Top nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(13,17,23,0.82);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav .wrap { display: flex; align-items: center; justify-content: space-between; height: 58px; }
.nav .brand { font-family: var(--mono); font-weight: 600; color: var(--fg); font-size: 15px; }
.nav .brand .dot { color: var(--accent); }
.nav .links { display: flex; gap: 22px; }
.nav .links a { font-family: var(--mono); font-size: 13.5px; color: var(--fg-dim); }
.nav .links a:hover { color: var(--accent); }
@media (max-width: 560px){ .nav .links { gap: 14px; } .nav .links a span { display:none; } }

/* ---------- Hero ---------- */
.hero { padding: 84px 0 56px; border-bottom: 1px solid var(--border); }
.hero .kicker {
  font-family: var(--mono); font-size: 13px; color: var(--accent);
  letter-spacing: .05em; margin-bottom: 16px;
}
.hero h1 { font-size: clamp(36px, 7vw, 62px); line-height: 1.05; letter-spacing: -0.02em; margin-bottom: 14px; }
.hero .role { font-size: clamp(18px, 3vw, 24px); color: var(--fg-dim); font-weight: 500; margin-bottom: 26px; }
.hero .role b { color: var(--accent); font-weight: 600; }
.hero .lead { font-size: 17px; color: var(--fg-dim); max-width: 660px; }

.badges { display: flex; flex-wrap: wrap; gap: 8px; margin: 26px 0 8px; }
.badge {
  font-family: var(--mono); font-size: 12px; color: var(--accent);
  background: rgba(77,208,167,0.08); border: 1px solid rgba(77,208,167,0.25);
  padding: 5px 11px; border-radius: 999px;
}

.cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.btn {
  font-family: var(--mono); font-size: 13.5px; padding: 10px 18px; border-radius: 8px;
  border: 1px solid var(--border-hi); color: var(--fg); background: var(--bg-soft);
  display: inline-flex; align-items: center; gap: 8px; transition: all .15s ease;
}
.btn:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-1px); }
.btn.primary { background: var(--accent); color: #06231a; border-color: var(--accent); font-weight: 600; }
.btn.primary:hover { background: #5fe0b8; color: #06231a; }

/* ---------- Sections ---------- */
section { padding: 60px 0; border-bottom: 1px solid var(--border); }
.sec-label {
  font-family: var(--mono); font-size: 13px; color: var(--fg-mute);
  letter-spacing: .08em; text-transform: uppercase; margin-bottom: 8px;
}
.sec-label::before { content: "// "; color: var(--accent); }
h2.sec-title { font-size: 28px; letter-spacing: -0.01em; margin-bottom: 28px; }

/* ---------- Skills ---------- */
.skills-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; }
.skill-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 12px; padding: 20px;
  transition: border-color .15s ease, transform .15s ease;
}
.skill-card:hover { border-color: var(--border-hi); transform: translateY(-2px); }
.skill-card h3 { font-family: var(--mono); font-size: 13px; color: var(--accent); margin-bottom: 12px; letter-spacing: .03em; }
.skill-card .tags { display: flex; flex-wrap: wrap; gap: 7px; }
.skill-card .tag { font-size: 13px; color: var(--fg-dim); background: var(--bg-soft); border: 1px solid var(--border); padding: 3px 9px; border-radius: 6px; }

/* ---------- Timeline ---------- */
.timeline { position: relative; padding-left: 28px; }
.timeline::before { content: ""; position: absolute; left: 6px; top: 6px; bottom: 6px; width: 2px; background: var(--border-hi); }
.tl-item { position: relative; margin-bottom: 34px; }
.tl-item::before {
  content: ""; position: absolute; left: -28px; top: 6px; width: 12px; height: 12px;
  border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 4px rgba(77,208,167,0.15);
}
.tl-item .tl-head { display: flex; flex-wrap: wrap; align-items: baseline; gap: 10px; margin-bottom: 4px; }
.tl-item .tl-title { font-size: 18px; font-weight: 600; }
.tl-item .tl-co { color: var(--accent); font-family: var(--mono); font-size: 14px; }
.tl-item .tl-date { font-family: var(--mono); font-size: 12.5px; color: var(--fg-mute); margin-left: auto; }
.tl-item .tl-loc { font-size: 13px; color: var(--fg-mute); margin-bottom: 10px; }
.tl-item ul { list-style: none; }
.tl-item li { position: relative; padding-left: 18px; color: var(--fg-dim); font-size: 15px; margin-bottom: 7px; }
.tl-item li::before { content: "▸"; position: absolute; left: 0; color: var(--accent); }

/* ---------- Project cards ---------- */
.proj-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; }
.proj-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 14px; padding: 26px;
  display: flex; flex-direction: column; transition: all .18s ease; position: relative; overflow: hidden;
}
.proj-card::after {
  content: ""; position: absolute; inset: 0; border-radius: 14px; pointer-events: none;
  box-shadow: inset 0 0 0 1px transparent; transition: box-shadow .18s ease;
}
.proj-card:hover { transform: translateY(-3px); border-color: var(--border-hi); }
.proj-card:hover::after { box-shadow: inset 0 0 40px rgba(77,208,167,0.06); }
.proj-card .p-tag { font-family: var(--mono); font-size: 11.5px; color: var(--accent-3); letter-spacing: .05em; margin-bottom: 10px; }
.proj-card h3 { font-size: 20px; margin-bottom: 8px; }
.proj-card p { color: var(--fg-dim); font-size: 14.5px; flex: 1; margin-bottom: 16px; }
.proj-card .p-stack { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 16px; }
.proj-card .p-stack span { font-family: var(--mono); font-size: 11.5px; color: var(--fg-mute); border: 1px solid var(--border); padding: 2px 8px; border-radius: 5px; }
.proj-card .p-link { font-family: var(--mono); font-size: 13px; color: var(--accent); align-self: flex-start; }
.proj-card .p-link:hover { text-decoration: underline; }

/* ---------- Metrics strip ---------- */
.metrics { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 18px; }
.metric { text-align: center; padding: 22px 12px; background: var(--bg-card); border: 1px solid var(--border); border-radius: 12px; }
.metric .num { font-family: var(--mono); font-size: 30px; font-weight: 700; color: var(--accent); line-height: 1; }
.metric .lbl { font-size: 13px; color: var(--fg-dim); margin-top: 8px; }

/* ---------- Footer ---------- */
footer { padding: 50px 0 70px; text-align: center; }
footer .f-links { display: flex; justify-content: center; gap: 20px; flex-wrap: wrap; margin-bottom: 18px; }
footer .f-links a { font-family: var(--mono); font-size: 14px; color: var(--fg-dim); }
footer .f-links a:hover { color: var(--accent); }
footer .f-note { font-family: var(--mono); font-size: 12px; color: var(--fg-mute); }

/* ---------- Project page specifics ---------- */
.page-hero { padding: 70px 0 40px; border-bottom: 1px solid var(--border); }
.page-hero .back { font-family: var(--mono); font-size: 13px; color: var(--fg-dim); }
.page-hero .back:hover { color: var(--accent); }
.page-hero h1 { font-size: clamp(30px, 5vw, 46px); margin: 20px 0 12px; letter-spacing: -0.02em; }
.page-hero .sub { color: var(--fg-dim); font-size: 17px; max-width: 680px; }
.page-hero .stack { display:flex; flex-wrap:wrap; gap:8px; margin-top:22px; }
.page-hero .stack span { font-family: var(--mono); font-size:12px; color:var(--accent); background:rgba(77,208,167,0.08); border:1px solid rgba(77,208,167,0.22); padding:4px 10px; border-radius:6px; }

.prose { padding: 50px 0; border-bottom: 1px solid var(--border); }
.prose h2 { font-size: 24px; margin-bottom: 16px; letter-spacing: -0.01em; }
.prose h3 { font-family: var(--mono); font-size: 15px; color: var(--accent); margin: 28px 0 10px; }
.prose p { color: var(--fg-dim); font-size: 16px; margin-bottom: 16px; }
.prose ul { margin: 0 0 18px 0; list-style: none; }
.prose li { position: relative; padding-left: 22px; color: var(--fg-dim); font-size: 15.5px; margin-bottom: 9px; }
.prose li::before { content: "▸"; position: absolute; left: 0; color: var(--accent); }
.prose code { font-family: var(--mono); font-size: 13.5px; color: var(--accent-3); background: var(--bg-soft); border: 1px solid var(--border); padding: 1px 6px; border-radius: 5px; }
.prose strong { color: var(--fg); }

.callout {
  background: var(--bg-card); border: 1px solid var(--border); border-left: 3px solid var(--accent);
  border-radius: 8px; padding: 18px 20px; margin: 22px 0;
}
.callout .c-label { font-family: var(--mono); font-size: 12px; color: var(--accent); letter-spacing: .05em; margin-bottom: 6px; }
.callout p { margin: 0; color: var(--fg-dim); font-size: 15px; }

/* Architecture diagram box */
.diagram { background: var(--bg-card); border: 1px solid var(--border); border-radius: 12px; padding: 26px; margin: 26px 0; overflow-x: auto; }
.diagram svg { display: block; margin: 0 auto; max-width: 100%; height: auto; }

.fade-up { opacity: 0; transform: translateY(16px); transition: opacity .5s ease, transform .5s ease; }
.fade-up.in { opacity: 1; transform: none; }