/* ==========================================================================
   Kyrylo Honchar — personal site
   Modern dark theme with amber accent (light theme via [data-theme="light"]).
   ========================================================================== */

:root {
  --bg:        #151b23;
  --bg-2:      #1b2430;
  --bg-3:      #222d3a;
  --ink:       #eef2f6;
  --text:      #c2cdd9;
  --muted:     #8494a3;
  --accent:    #e6a13a;
  --accent-2:  #f2b657;
  --accent-ink:#171d26;
  --border:    rgba(255, 255, 255, .08);
  --border-2:  rgba(255, 255, 255, .14);
  --shadow:    0 18px 40px -18px rgba(0, 0, 0, .55);
  --ring:      rgba(230, 161, 58, .22);
  --nav-bg:    rgba(21, 27, 35, .72);
  --radius:    16px;
  --radius-sm: 10px;
  --maxw:      1080px;
  --font:      "Inter", "Segoe UI", system-ui, -apple-system, Roboto, Arial, sans-serif;
}

:root[data-theme="light"] {
  --bg:        #f3f6fa;
  --bg-2:      #ffffff;
  --bg-3:      #eef2f7;
  --ink:       #1c2836;
  --text:      #41505f;
  --muted:     #6b7887;
  --accent:    #c9821f;
  --accent-2:  #b3701a;
  --accent-ink:#ffffff;
  --border:    rgba(15, 30, 50, .10);
  --border-2:  rgba(15, 30, 50, .18);
  --shadow:    0 18px 38px -20px rgba(20, 40, 70, .28);
  --ring:      rgba(201, 130, 31, .18);
  --nav-bg:    rgba(243, 246, 250, .78);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* soft radial glow behind the hero */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(60rem 40rem at 78% -10%, var(--ring), transparent 60%),
    radial-gradient(50rem 40rem at -10% 10%, rgba(120, 150, 200, .10), transparent 55%);
  pointer-events: none;
  z-index: 0;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-2); }
img { max-width: 100%; display: block; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

h1, h2, h3, h4 { color: var(--ink); line-height: 1.15; margin: 0; }

/* Progressive enhancement: only hide-for-reveal when JS is active, so
   no-JS visitors still see everything. */
.js .reveal { opacity: 0; transform: translateY(16px); transition: opacity .6s ease, transform .6s ease; }
.js .reveal.is-visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .js .reveal { opacity: 1; transform: none; transition: none; } }

/* ---------- Nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: saturate(160%) blur(12px);
  background: var(--nav-bg);
  border-bottom: 1px solid var(--border);
}
.nav-inner { display: flex; align-items: center; gap: 20px; height: 64px; }
.brand { font-weight: 800; letter-spacing: .01em; color: var(--ink); font-size: 1.05rem; }
.brand span { color: var(--accent); }
.nav-links { display: flex; gap: 22px; margin-left: auto; }
.nav-links a { color: var(--muted); font-weight: 600; font-size: .92rem; }
.nav-links a:hover { color: var(--ink); }
.nav-actions { display: flex; align-items: center; gap: 10px; margin-left: 6px; }

.icon-btn {
  display: inline-grid; place-items: center;
  width: 40px; height: 40px; border-radius: 50%;
  border: 1px solid var(--border-2); background: transparent; color: var(--text);
  cursor: pointer; transition: border-color .2s, color .2s, transform .2s;
}
.icon-btn:hover { color: var(--accent); border-color: var(--accent); transform: translateY(-1px); }
.theme-toggle .moon { display: none; }
:root[data-theme="light"] .theme-toggle .sun { display: none; }
:root[data-theme="light"] .theme-toggle .moon { display: block; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 11px 20px; border-radius: 999px; font-weight: 700; font-size: .92rem;
  border: 1px solid transparent; cursor: pointer; transition: transform .18s, box-shadow .18s, background .18s, border-color .18s;
}
.btn-primary { background: var(--accent); color: var(--accent-ink); box-shadow: 0 10px 24px -12px var(--accent); }
.btn-primary:hover { color: var(--accent-ink); transform: translateY(-2px); box-shadow: 0 16px 28px -12px var(--accent); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--border-2); }
.btn-ghost:hover { color: var(--ink); border-color: var(--accent); transform: translateY(-2px); }
.btn-sm { padding: 8px 15px; font-size: .85rem; }

/* ---------- Hero ---------- */
.hero { position: relative; z-index: 1; padding: 66px 0 40px; }
.hero-grid { display: grid; grid-template-columns: 1fr auto; gap: 48px; align-items: center; }
.kicker { color: var(--accent); font-weight: 700; letter-spacing: .18em; text-transform: uppercase; font-size: .78rem; }
.hero h1 { font-size: clamp(2.3rem, 5vw, 3.4rem); font-weight: 800; margin: 12px 0 6px; letter-spacing: -.01em; }
.hero .role { font-size: 1.15rem; color: var(--muted); font-weight: 600; }
.hero .lead { margin: 20px 0 26px; max-width: 46ch; color: var(--text); }
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.socials { display: flex; gap: 12px; margin-top: 26px; }
.socials a {
  display: inline-grid; place-items: center; width: 42px; height: 42px; border-radius: 12px;
  background: var(--bg-2); border: 1px solid var(--border); color: var(--text); font-size: 1.05rem;
  transition: transform .18s, color .18s, border-color .18s, background .18s;
}
.socials a:hover { color: var(--accent); border-color: var(--accent); transform: translateY(-3px); }

.avatar { position: relative; width: 232px; height: 232px; }
.avatar img { width: 100%; height: 100%; border-radius: 50%; object-fit: cover; border: 3px solid var(--accent); box-shadow: var(--shadow); }
.avatar::after {
  content: ""; position: absolute; inset: -12px; border-radius: 50%;
  border: 1px dashed var(--border-2); animation: spin 26s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .avatar::after { animation: none; } }

/* ---------- Sections ---------- */
section { position: relative; z-index: 1; padding: 40px 0; }
.section-head { margin-bottom: 26px; }
.section-head .kicker { display: block; }
.section-head h2 { font-size: clamp(1.5rem, 3vw, 2rem); font-weight: 800; margin-top: 8px; }

/* ---------- About ---------- */
.about-card {
  background: var(--bg-2); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px 30px; box-shadow: var(--shadow); font-size: 1.05rem;
}
.about-card p { margin: 0 0 14px; }
.about-card p:last-child { margin-bottom: 0; }

/* ---------- Skills ---------- */
.skill-groups { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.skill-group {
  background: var(--bg-2); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px 22px;
}
.skill-group h3 { font-size: .82rem; text-transform: uppercase; letter-spacing: .12em; color: var(--accent); margin-bottom: 12px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  padding: 6px 13px; border-radius: 999px; font-size: .86rem; font-weight: 600;
  background: var(--bg-3); color: var(--text); border: 1px solid var(--border);
}

/* ---------- Timeline (experience) ---------- */
.timeline { position: relative; margin-left: 8px; padding-left: 30px; border-left: 2px solid var(--border-2); }
.tl-item { position: relative; padding-bottom: 30px; }
.tl-item:last-child { padding-bottom: 0; }
.tl-item::before {
  content: ""; position: absolute; left: -39px; top: 4px; width: 14px; height: 14px; border-radius: 50%;
  background: var(--accent); box-shadow: 0 0 0 4px var(--bg);
}
.tl-head { display: flex; flex-wrap: wrap; align-items: baseline; gap: 6px 12px; }
.tl-head h3 { font-size: 1.14rem; font-weight: 700; }
.tl-head .place { color: var(--accent); font-weight: 700; }
.tl-date { margin-left: auto; color: var(--muted); font-weight: 600; font-size: .9rem; white-space: nowrap; }
.tl-date .dur { font-size: .82rem; opacity: .85; }
.tl-head .place .former { color: var(--accent); font-weight: 600; font-size: .85rem; }
.tl-role { color: var(--muted); font-weight: 600; margin: 2px 0 8px; font-size: .95rem; }
.tl-role .lvl { color: var(--muted); font-weight: 700; }
.tl-item p { margin: 0; }
.tl-tags { margin-top: 10px; }

/* ---------- Projects ---------- */
.proj-group { margin-bottom: 30px; }
.proj-group > h3 {
  font-size: .82rem; text-transform: uppercase; letter-spacing: .12em; color: var(--muted);
  margin-bottom: 14px; display: flex; align-items: center; gap: 10px;
}
.proj-group > h3::after { content: ""; flex: 1; height: 1px; background: var(--border); }
.proj-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.card {
  display: flex; flex-direction: column; background: var(--bg-2); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow);
  transition: transform .2s, border-color .2s;
}
.card:hover { transform: translateY(-4px); border-color: var(--accent); }
.card-top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 10px; }
.card-icon { color: var(--accent); font-size: 1.25rem; }
.card-link { color: var(--muted); font-size: 1.05rem; }
.card-link:hover { color: var(--accent); }
.card h4 { font-size: 1.05rem; margin-bottom: 8px; }
.card h4 a { color: var(--ink); }
.card h4 a:hover { color: var(--accent); }
.card p { margin: 0 0 14px; font-size: .92rem; color: var(--text); flex: 1; }
.tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tag { font-size: .74rem; font-weight: 600; color: var(--muted); background: var(--bg-3); border: 1px solid var(--border); border-radius: 6px; padding: 3px 8px; }
.projects-more { text-align: center; margin-top: 8px; }

/* ---------- Education ---------- */
.edu-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.edu-card { background: var(--bg-2); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px 24px; box-shadow: var(--shadow); }
.edu-card .deg { display: flex; align-items: center; gap: 10px; font-weight: 700; color: var(--ink); }
.edu-card .deg i { color: var(--accent); }
.edu-card .uni { color: var(--muted); margin-top: 6px; font-weight: 600; }
.edu-card .yr { color: var(--accent); font-weight: 700; font-size: .9rem; margin-top: 4px; }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--border); margin-top: 30px; padding: 26px 0; color: var(--muted); font-size: .85rem; }
.footer-inner { display: flex; flex-wrap: wrap; gap: 10px 18px; align-items: center; justify-content: space-between; }
.footer-links { display: flex; flex-wrap: wrap; gap: 16px; }
.footer a { color: var(--muted); }
.footer a:hover { color: var(--accent); }

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .nav-links { display: none; }
  .hero-grid { grid-template-columns: 1fr; gap: 30px; text-align: left; }
  .avatar { order: -1; width: 150px; height: 150px; }
  .skill-groups, .edu-grid { grid-template-columns: 1fr; }
  .proj-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 560px) {
  .proj-grid { grid-template-columns: 1fr; }
  .tl-date { margin-left: 0; width: 100%; }
}