/* ============================================================
   Sergio Shmyhelskyy — Portfolio
   Theme system: [data-theme="dark"] (default) / [data-theme="light"]
   ============================================================ */

:root {
  --font-sans: "Inter", system-ui, -apple-system, sans-serif;
  --font-display: "Space Grotesk", "Inter", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "Cascadia Code", monospace;
  --radius: 10px;
  --nav-h: 72px;
  --maxw: 1280px;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --bg: #0a0f1c;
  --bg-alt: #0f172a;
  --surface: #111a2e;
  --surface-2: #16223b;
  --border: #1f2d4a;
  --text: #cbd5e1;
  --text-strong: #f1f5f9;
  --text-dim: #7c8cab;
  --accent: #22d3ee;
  --accent-2: #34d399;
  --accent-soft: rgba(34, 211, 238, 0.1);
  --shadow: 0 10px 30px -12px rgba(0, 0, 0, 0.6);
  --net-node: rgba(34, 211, 238, 0.55);
  --net-link: rgba(34, 211, 238, 0.12);
  --scrim: rgba(10, 15, 28, 0.85);
}

[data-theme="light"] {
  --bg: #f6f8fb;
  --bg-alt: #eef2f7;
  --surface: #ffffff;
  --surface-2: #f1f5f9;
  --border: #dbe3ee;
  --text: #334155;
  --text-strong: #0f172a;
  --text-dim: #64748b;
  --accent: #0891b2;
  --accent-2: #059669;
  --accent-soft: rgba(8, 145, 178, 0.08);
  --shadow: 0 10px 30px -12px rgba(15, 23, 42, 0.15);
  --net-node: rgba(8, 145, 178, 0.45);
  --net-link: rgba(8, 145, 178, 0.1);
  --scrim: rgba(246, 248, 251, 0.88);
}

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

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + 16px); }

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  transition: background var(--transition), color var(--transition);
  overflow-x: hidden;
}

.mono { font-family: var(--font-mono); }
.accent { color: var(--accent); }
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

h1, h2, h3 { font-family: var(--font-display); letter-spacing: -0.01em; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

::selection { background: var(--accent); color: var(--bg); }

/* custom scrollbar */
::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 6px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

/* ---------- intro animation ---------- */
body.intro-active { overflow: hidden; }

.intro {
  position: fixed;
  inset: 0;
  z-index: 999;
  background: var(--bg);
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: opacity 0.65s ease, visibility 0.65s ease;
}
.intro--done { opacity: 0; visibility: hidden; pointer-events: none; }

.intro__inner {
  width: min(600px, 92vw);
  text-align: center;
  position: relative;
}

.intro__boot {
  text-align: left;
  font-size: 0.72rem;
  color: var(--text-dim);
  min-height: 120px;
  margin-bottom: 30px;
}
.intro__boot p { animation: intro-line 0.25s ease; }
.intro__boot .ok { color: var(--accent-2); }
@keyframes intro-line {
  from { opacity: 0; transform: translateX(-8px); }
  to { opacity: 1; transform: none; }
}

.intro__handshake {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 40px;
  opacity: 0;
  transition: opacity 0.4s ease;
}
.intro__handshake.on { opacity: 1; }
.intro__host {
  font-size: 0.78rem;
  color: var(--text-strong);
  padding: 7px 14px;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--surface);
}
.intro__wire {
  position: relative;
  width: min(190px, 34vw);
  height: 2px;
  background: var(--border);
}
.intro__packet {
  position: absolute;
  top: 50%;
  left: 0;
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 14px var(--accent);
  transform: translate(-50%, -50%);
  transition: left 0.45s ease-in-out;
}
.intro__packet::after {
  content: attr(data-label);
  position: absolute;
  top: -24px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.64rem;
  color: var(--accent);
  white-space: nowrap;
  letter-spacing: 0.08em;
}

.intro__brand {
  display: flex;
  flex-direction: column;
  gap: 10px;
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.intro__brand.on { opacity: 1; transform: none; }
.intro__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.5rem, 5.2vw, 2.7rem);
  color: var(--text-strong);
  letter-spacing: 0.55em;
  margin-right: -0.55em; /* compensate trailing tracking */
  transition: letter-spacing 1.1s cubic-bezier(0.22, 1, 0.36, 1);
}
.intro__brand.on .intro__name { letter-spacing: 0.16em; margin-right: -0.16em; }
.intro__role { color: var(--accent); font-size: 0.9rem; }

.intro__skip {
  position: absolute;
  bottom: -80px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.66rem;
  color: var(--text-dim);
  letter-spacing: 0.24em;
  text-transform: uppercase;
  animation: pulse 2.4s infinite;
}

/* ---------- show more / show less ---------- */
.card__bullets.collapsible.collapsed li:nth-child(n + 4) { display: none; }
.bullets-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 10px;
  padding: 4px 0;
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent);
  transition: color var(--transition);
}
.bullets-toggle:hover { color: var(--accent-2); }

/* ---------- animated background ---------- */
#net-canvas {
  position: fixed;
  inset: 0;
  z-index: -1;
  opacity: 0.7;
}

/* subtle engineering grid overlay */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: 0.14;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, black 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, black 30%, transparent 80%);
}

/* ---------- nav ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  backdrop-filter: blur(12px);
  background: var(--scrim);
  border-bottom: 1px solid var(--border);
  z-index: 100;
  transition: background var(--transition);
}

.nav__inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  column-gap: clamp(24px, 3.5vw, 48px);
  height: 100%;
  max-width: min(1440px, 97vw);
  margin: 0 auto;
  padding: 0 clamp(20px, 4vw, 48px);
}

.nav__logo {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text-strong);
  display: flex;
  flex-direction: column;
  line-height: 1.25;
  flex-shrink: 0;
  min-width: 0;
}
.nav__logo-name {
  white-space: nowrap;
  font-size: clamp(0.82rem, 1vw, 0.95rem);
  letter-spacing: -0.02em;
}
.nav__logo:hover { text-decoration: none; }
.nav__logo-role {
  font-size: 0.62rem;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  white-space: nowrap;
}
.nav__prompt { color: var(--accent); }

.cursor-blink { animation: blink 1.1s step-end infinite; color: var(--accent); }
@keyframes blink { 50% { opacity: 0; } }

.nav__links {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: clamp(18px, 2vw, 32px);
  list-style: none;
  flex-wrap: nowrap;
  min-width: 0;
  padding: 0 clamp(8px, 1vw, 16px);
}
.nav__links li { flex-shrink: 0; }
.nav__links a {
  color: var(--text);
  font-size: clamp(0.8rem, 0.85vw, 0.9rem);
  font-weight: 500;
  position: relative;
  padding-bottom: 4px;
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  gap: 3px;
}
.nav__links a::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width var(--transition);
}
.nav__links a:hover { color: var(--accent); text-decoration: none; }
.nav__links a.active { color: var(--accent); }
.nav__links a.active::after,
.nav__links a:hover::after { width: 100%; }
.nav__idx {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 0.68rem;
  flex-shrink: 0;
  opacity: 0.85;
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  padding-left: clamp(12px, 2vw, 24px);
}

.theme-toggle {
  display: grid;
  place-items: center;
  width: 38px; height: 38px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--accent);
  cursor: pointer;
  transition: transform var(--transition), background var(--transition);
}

.lang-toggle {
  display: grid;
  place-items: center;
  min-width: 38px; height: 38px;
  padding: 0 10px;
  border-radius: 19px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: border-color var(--transition), transform var(--transition);
}
.lang-toggle:hover { border-color: var(--accent); transform: translateY(-1px); }
.theme-toggle:hover { transform: rotate(20deg) scale(1.06); }
[data-theme="dark"] .icon-sun { display: none; }
[data-theme="light"] .icon-moon { display: none; }

.cmd-trigger {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 38px;
  padding: 0 12px;
  border-radius: 19px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-dim);
  font-size: 0.72rem;
  cursor: pointer;
  transition: border-color var(--transition), color var(--transition);
}
.cmd-trigger:hover { border-color: var(--accent); color: var(--accent); }
.cmd-trigger kbd {
  font-size: 0.65rem;
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: var(--bg-alt);
  color: var(--text-dim);
}
@media (max-width: 1240px) {
  .cmd-trigger kbd { display: none; }
  .cmd-trigger { padding: 0 10px; }
}

/* Compact desktop: hide hex indices so ES/CA labels stay on one line */
@media (max-width: 1380px) and (min-width: 1101px) {
  .nav__idx { display: none; }
  .nav__links { gap: clamp(14px, 1.6vw, 24px); }
}

@media (max-width: 1180px) and (min-width: 1101px) {
  .cmd-trigger { display: none; }
}

.nav__burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.nav__burger span {
  width: 22px; height: 2px;
  background: var(--text-strong);
  transition: var(--transition);
}

/* ---------- hero ---------- */
.hero {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 48px;
  padding-top: var(--nav-h);
  position: relative;
}

.hero__kicker {
  color: var(--accent);
  margin-bottom: 14px;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 12px;
}
.hero__kicker-line {
  display: inline-block;
  width: 42px;
  height: 1px;
  background: var(--accent);
}

.hero__name {
  font-size: clamp(2.4rem, 6vw, 4rem);
  color: var(--text-strong);
  font-weight: 700;
  line-height: 1.08;
}

.hero__tagline {
  font-size: clamp(1.5rem, 3.8vw, 2.4rem);
  font-weight: 700;
  margin: 8px 0 18px;
  line-height: 1.2;
  background: linear-gradient(100deg, var(--text-dim) 0%, var(--accent) 45%, var(--accent-2) 70%, var(--accent) 100%);
  background-size: 200% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  width: fit-content;
  animation: gradient-shift 7s ease-in-out infinite;
}
@keyframes gradient-shift {
  0%, 100% { background-position: 0% 0; }
  50% { background-position: 100% 0; }
}

/* hero status chips */
.hero__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 22px;
}
.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.74rem;
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--text-dim);
}
.chip__dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent-2);
  box-shadow: 0 0 8px var(--accent-2);
  animation: pulse 2s infinite;
}

.hero__desc { max-width: 560px; margin-bottom: 30px; }

/* scroll indicator */
.hero__scroll {
  position: absolute;
  bottom: 26px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-size: 0.7rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--text-dim);
}
.hero__scroll:hover { color: var(--accent); text-decoration: none; }
.hero__scroll-line {
  width: 1px;
  height: 44px;
  background: linear-gradient(var(--accent), transparent);
  animation: scroll-pulse 2s ease-in-out infinite;
}
@keyframes scroll-pulse {
  0%, 100% { transform: scaleY(0.4); transform-origin: top; opacity: 0.4; }
  50% { transform: scaleY(1); opacity: 1; }
}

.hero__cta { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }

.hero__social { display: flex; gap: 14px; margin-left: 8px; }
.hero__social a {
  color: var(--text-dim);
  transition: color var(--transition), transform var(--transition);
  display: grid; place-items: center;
}
.hero__social a:hover { color: var(--accent); transform: translateY(-3px); }

/* buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid var(--accent);
  cursor: pointer;
  font-family: var(--font-sans);
  transition: var(--transition);
}
.btn:hover { text-decoration: none; transform: translateY(-2px); }
.btn--primary { background: var(--accent); color: var(--bg); }
.btn--primary:hover { box-shadow: 0 8px 24px -8px var(--accent); }
.btn--ghost { background: transparent; color: var(--accent); }
.btn--ghost:hover { background: var(--accent-soft); }
.btn--lg { padding: 15px 34px; font-size: 1.05rem; }

/* terminal card */
.terminal {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.terminal__bar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 10px 14px;
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
}
.dot { width: 11px; height: 11px; border-radius: 50%; }
.dot--r { background: #f87171; }
.dot--y { background: #fbbf24; }
.dot--g { background: #34d399; }
.terminal__title { margin-left: 8px; font-size: 0.78rem; color: var(--text-dim); }
.terminal__body { padding: 18px 20px; font-size: 0.86rem; }
.terminal__body p { margin-bottom: 6px; white-space: nowrap; overflow: hidden; }
.t-prompt { color: var(--accent-2); font-weight: 700; }
.t-out { color: var(--text-dim); padding-left: 16px; }

.terminal__status {
  display: flex;
  gap: 18px;
  padding: 8px 16px;
  border-top: 1px solid var(--border);
  background: var(--surface-2);
  font-size: 0.68rem;
  color: var(--text-dim);
}
.terminal__status span { display: inline-flex; align-items: center; gap: 6px; }
.terminal__status-right { margin-left: auto; }
.status-led {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--accent-2);
  box-shadow: 0 0 6px var(--accent-2);
  animation: pulse 1.6s infinite;
}

/* ---------- sections ---------- */
.section { padding: 96px 24px; }

.section__title {
  font-size: clamp(1.5rem, 3.4vw, 2rem);
  color: var(--text-strong);
  font-weight: 700;
  margin-bottom: 36px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.section__title::after {
  content: "";
  flex: 1;
  max-width: 320px;
  height: 1px;
  background: var(--border);
}
.section__title--center { justify-content: center; }
.section__title--center::after { display: none; }
.section__idx { color: var(--accent); font-size: 0.85em; }
.section__sub { margin: -22px 0 34px; color: var(--text-dim); }

/* ---------- about ---------- */
.about__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 44px;
  align-items: start;
}
.about__text p { margin-bottom: 16px; }
.about__facts { list-style: none; margin-top: 22px; font-size: 0.88rem; }
.about__facts li { margin-bottom: 8px; }
.about__facts .t-prompt { margin-right: 8px; }

.about__stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 18px;
  text-align: center;
  transition: transform var(--transition), border-color var(--transition);
}
.stat-card:hover { transform: translateY(-4px); border-color: var(--accent); }
.stat-card__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
}
.stat-card__label { font-size: 0.8rem; color: var(--text-dim); }

/* ---------- timeline (experience / education) ---------- */
.timeline {
  position: relative;
  padding-left: 28px;
}
.timeline::before {
  content: "";
  position: absolute;
  left: 6px; top: 6px; bottom: 6px;
  width: 2px;
  background: linear-gradient(var(--accent), var(--border));
}
.timeline__item { position: relative; margin-bottom: 34px; }
.timeline__marker {
  position: absolute;
  left: -28px; top: 26px;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--bg);
  border: 3px solid var(--accent);
  z-index: 1;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 28px;
  box-shadow: var(--shadow);
  transition: border-color var(--transition);
  position: relative;
}
.card:hover { border-color: var(--accent); }

/* corner brackets on hover — "network node selected" effect */
.card::before, .card::after,
.project::before, .project::after {
  content: "";
  position: absolute;
  width: 18px; height: 18px;
  border: 2px solid var(--accent);
  opacity: 0;
  transition: opacity var(--transition), transform var(--transition);
  pointer-events: none;
}
.card::before, .project::before {
  top: -2px; left: -2px;
  border-right: none; border-bottom: none;
  border-radius: var(--radius) 0 0 0;
  transform: translate(6px, 6px);
}
.card::after, .project::after {
  bottom: -2px; right: -2px;
  border-left: none; border-top: none;
  border-radius: 0 0 var(--radius) 0;
  transform: translate(-6px, -6px);
}
.card:hover::before, .card:hover::after,
.project:hover::before, .project:hover::after {
  opacity: 1;
  transform: translate(0, 0);
}
.card__head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}
.card h3 { color: var(--text-strong); font-size: 1.15rem; }
.card__org { color: var(--accent); font-size: 0.92rem; font-weight: 500; }
.card__date { color: var(--text-dim); font-size: 0.82rem; white-space: nowrap; }

.card__bullets { margin: 12px 0 4px 18px; }
.card__bullets li { margin-bottom: 8px; font-size: 0.95rem; }

/* tags */
.tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}
.tags li {
  font-size: 0.74rem;
  padding: 4px 11px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid transparent;
}
.tags--lg li { font-size: 0.82rem; padding: 6px 14px; }
.tags--lg li:hover { border-color: var(--accent); }

/* ---------- projects ---------- */
.projects__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}
.project {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition), border-color var(--transition);
  position: relative;
}
.project:hover { transform: translateY(-5px); border-color: var(--accent); }
.project h3 { color: var(--text-strong); margin-bottom: 10px; font-size: 1.08rem; }
.project p { font-size: 0.93rem; flex: 1; }
.project--featured {
  grid-column: 1 / -1;
  background: linear-gradient(135deg, var(--surface), var(--surface-2));
}
.project__badge {
  color: var(--accent-2);
  font-size: 0.78rem;
  margin-bottom: 12px;
  letter-spacing: 0.04em;
}
.project__links { margin-top: 16px; display: flex; gap: 16px; align-items: center; }
.project__links a { font-size: 0.85rem; font-weight: 600; }
.project__meta {
  display: flex;
  gap: 14px;
  margin-top: 14px;
  font-size: 0.78rem;
  color: var(--text-dim);
  font-family: var(--font-mono);
}
.project__meta .lang-dot {
  display: inline-block;
  width: 10px; height: 10px;
  border-radius: 50%;
  margin-right: 5px;
  vertical-align: -1px;
  background: var(--accent);
}

/* live GitHub repos header */
.projects__live-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
  margin: 42px 0 20px;
}
.projects__live-title {
  color: var(--text-strong);
  font-size: 1rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 10px;
}
.projects__live-note { color: var(--text-dim); font-size: 0.78rem; font-weight: 400; }
.projects__live-link { font-size: 0.82rem; }
.live-dot {
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--text-dim);
  flex-shrink: 0;
}
.live-dot.ok { background: var(--accent-2); box-shadow: 0 0 8px var(--accent-2); animation: pulse 2s infinite; }
.live-dot.err { background: #f87171; }
@keyframes pulse { 50% { opacity: 0.5; } }

/* ---------- skills ---------- */
.skills__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}
.skill-group {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: border-color var(--transition);
}
.skill-group:hover { border-color: var(--accent); }
.skill-group h3 {
  color: var(--accent-2);
  font-size: 0.95rem;
  margin-bottom: 14px;
  font-weight: 600;
}

/* ---------- CV ---------- */
.cv__card {
  display: flex;
  align-items: center;
  gap: 22px;
  flex-wrap: wrap;
}
.cv__icon { color: var(--accent); flex-shrink: 0; }
.cv__card h3 { color: var(--text-strong); }
.cv__meta { color: var(--text-dim); font-size: 0.8rem; margin-top: 2px; }
.cv__actions { margin-left: auto; display: flex; gap: 12px; flex-wrap: wrap; }

.cv__subtitle { color: var(--text); font-size: 0.92rem; margin-top: 2px; }

/* CV language pills */
.cv__langs {
  display: inline-flex;
  gap: 4px;
  margin-top: 10px;
  padding: 3px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg-alt);
}
.cv__lang {
  border: none;
  background: transparent;
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 999px;
  cursor: pointer;
  transition: var(--transition);
}
.cv__lang:hover { color: var(--accent); }
.cv__lang.active { background: var(--accent); color: var(--bg); }

.cv__preview-block {
  margin-top: 26px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--surface);
  box-shadow: var(--shadow);
}
.cv__preview-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
  padding: 12px 18px;
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
}
.cv__preview-label {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--text-strong);
  display: inline-flex;
  align-items: center;
  gap: 9px;
}
.cv__preview-label::before {
  content: "";
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent);
}
.cv__preview-hint { font-size: 0.74rem; color: var(--text-dim); }

.cv__preview {
  padding: 10px;
  background: var(--bg-alt);
  position: relative;
}
.cv__preview iframe {
  display: block;
  width: 100%;
  /* intentionally short: the document must be scrolled inside the frame */
  height: min(52vh, 520px);
  min-height: 360px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #fff;
}
.cv__preview::after {
  content: "";
  position: absolute;
  left: 10px; right: 10px; bottom: 10px;
  height: 48px;
  border-radius: 0 0 6px 6px;
  background: linear-gradient(transparent, var(--scrim));
  pointer-events: none;
}

/* ---------- contact ---------- */
.section--contact { text-align: center; padding-bottom: 130px; }
.contact__lead { max-width: 620px; margin: 0 auto 34px; }
.contact__buttons { margin-bottom: 26px; }

/* contact form */
.contact__form {
  max-width: 640px;
  margin: 0 auto 40px;
  text-align: left;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
}
.contact__form label { display: block; margin-bottom: 18px; }
.contact__form label span {
  display: block;
  font-size: 0.78rem;
  color: var(--accent-2);
  margin-bottom: 6px;
}
.contact__form input,
.contact__form textarea {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-alt);
  color: var(--text-strong);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  transition: border-color var(--transition);
  resize: vertical;
}
.contact__form input:focus,
.contact__form textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.contact__form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.contact__form-foot {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.contact__form-status { font-size: 0.8rem; color: var(--accent-2); margin: 0; }

@media (max-width: 560px) {
  .contact__form-row { grid-template-columns: 1fr; }
}

/* certifications */
.certs__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 14px;
  margin-top: 6px;
}
.cert {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-alt);
  transition: border-color var(--transition);
}
.cert:hover { border-color: var(--accent); }
.cert h4 { font-size: 0.88rem; color: var(--text-strong); font-weight: 600; }
.cert__issuer { font-size: 0.7rem; color: var(--text-dim); }
.cert__badge {
  flex-shrink: 0;
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 6px;
  padding: 6px 8px;
  letter-spacing: 0.04em;
}
.cert__status {
  margin-left: auto;
  font-size: 0.64rem;
  padding: 3px 9px;
  border-radius: 999px;
  white-space: nowrap;
}
.cert__status--progress { background: rgba(251, 191, 36, 0.14); color: #fbbf24; }
.cert__status--roadmap { background: var(--accent-soft); color: var(--accent); }
.cert__status--active { background: rgba(52, 211, 153, 0.14); color: #34d399; }
.contact__alt {
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
  font-size: 0.85rem;
  color: var(--text-dim);
}

/* ---------- mascot: 8-bit router bot ---------- */
.mascot {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 90;
  background: none;
  border: none;
  padding: 6px;
  cursor: pointer;
  animation: mascot-bob 3.2s ease-in-out infinite;
  filter: drop-shadow(0 6px 14px rgba(0, 0, 0, 0.35));
  transition: transform var(--transition);
}
.mascot:hover { transform: scale(1.08); }
.mascot.jump { animation: mascot-jump 0.5s ease; }

@keyframes mascot-bob {
  0%, 100% { translate: 0 0; }
  50% { translate: 0 -6px; }
}
@keyframes mascot-jump {
  0%, 100% { translate: 0 0; }
  40% { translate: 0 -16px; }
}

/* pixel colors (theme-aware) */
.m-body { fill: var(--surface-2); stroke: var(--border); stroke-width: 0.5; }
.m-screen { fill: var(--bg); }
.m-metal { fill: var(--text-dim); }
.m-eye { fill: var(--accent); }
.m-mouth { fill: var(--accent-2); }
.m-led-tip { fill: var(--accent); animation: led-pulse 1.6s infinite; }
.m-led-tip--2 { animation-delay: 0.8s; }
.m-led { animation: led-pulse 1.2s infinite; }
.m-led--1 { fill: #34d399; }
.m-led--2 { fill: #fbbf24; animation-delay: 0.4s; }
.m-led--3 { fill: var(--accent); animation-delay: 0.8s; }
@keyframes led-pulse { 50% { opacity: 0.25; } }

.m-eyes {
  animation: eyes-blink 4.5s infinite;
  transform-origin: 32px 26px;
}
@keyframes eyes-blink {
  0%, 92%, 100% { transform: scaleY(1); }
  95% { transform: scaleY(0.12); }
}

/* speech bubble */
.mascot__bubble {
  position: absolute;
  bottom: calc(100% + 12px);
  right: 0;
  background: var(--surface);
  border: 1px solid var(--accent);
  border-radius: 8px 8px 2px 8px;
  padding: 8px 12px;
  font-size: 0.7rem;
  color: var(--text-strong);
  white-space: nowrap;
  opacity: 0;
  transform: translateY(6px) scale(0.9);
  transform-origin: bottom right;
  transition: opacity var(--transition), transform var(--transition);
  pointer-events: none;
}
.mascot__bubble.show { opacity: 1; transform: none; }
.mascot__bubble.actionable { pointer-events: auto; cursor: pointer; }
.mascot__bubble a {
  color: var(--accent);
  font-weight: 700;
  text-decoration: none;
}
.mascot__bubble.actionable:hover {
  border-color: var(--accent-2);
  box-shadow: 0 4px 16px -6px var(--accent);
}
.mascot__bubble.actionable:hover a { color: var(--accent-2); }

/* ping ripple */
.mascot__ripple {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 2px solid var(--accent);
  opacity: 0;
  pointer-events: none;
}
.mascot__ripple.ping { animation: ripple 0.8s ease-out; }
@keyframes ripple {
  0% { opacity: 0.8; transform: scale(0.5); }
  100% { opacity: 0; transform: scale(1.9); }
}

@media (max-width: 560px) {
  .mascot { right: 14px; bottom: 14px; transform: scale(0.82); transform-origin: bottom right; }
  .mascot:hover { transform: scale(0.82); }
}

@media (prefers-reduced-motion: reduce) {
  .mascot, .m-led, .m-led-tip, .m-eyes { animation: none; }
}

/* ---------- command palette ---------- */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.cmd-palette {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: grid;
  place-items: start center;
  padding-top: min(18vh, 140px);
  opacity: 0;
  transition: opacity 0.2s ease;
}
.cmd-palette.open { opacity: 1; }
.cmd-palette[hidden] { display: none; }

.cmd-palette__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(4px);
}

.cmd-palette__panel {
  position: relative;
  width: min(560px, 94vw);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 24px 60px -16px rgba(0, 0, 0, 0.55);
  overflow: hidden;
  transform: translateY(-8px) scale(0.98);
  transition: transform 0.2s ease;
}
.cmd-palette.open .cmd-palette__panel { transform: none; }

.cmd-palette__head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--surface-2);
}
.cmd-palette__head input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-strong);
  font-family: var(--font-mono);
  font-size: 0.92rem;
}
.cmd-palette__head input::placeholder { color: var(--text-dim); }
.cmd-palette__head kbd {
  font-size: 0.65rem;
  padding: 3px 7px;
  border-radius: 4px;
  border: 1px solid var(--border);
  color: var(--text-dim);
}

.cmd-palette__list {
  list-style: none;
  max-height: 340px;
  overflow-y: auto;
  padding: 6px;
  margin: 0;
}

.cmd-palette__group {
  padding: 10px 12px 4px;
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.cmd-palette__item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: 8px;
  cursor: pointer;
  transition: background var(--transition);
}
.cmd-palette__item:hover,
.cmd-palette__item.active {
  background: var(--accent-soft);
}
.cmd-palette__item.active .cmd-palette__label { color: var(--accent); }

.cmd-palette__icon {
  width: 28px;
  text-align: center;
  font-size: 0.72rem;
  color: var(--accent);
  flex-shrink: 0;
}
.cmd-palette__label { font-size: 0.9rem; color: var(--text); }

.cmd-palette__empty {
  padding: 24px;
  text-align: center;
  color: var(--text-dim);
  font-size: 0.82rem;
}

.cmd-palette__foot {
  padding: 10px 16px;
  border-top: 1px solid var(--border);
  font-size: 0.68rem;
  color: var(--text-dim);
  text-align: center;
}

/* ---------- footer ---------- */
.footer {
  border-top: 1px solid var(--border);
  padding: 30px 24px;
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-dim);
}
.footer__social {
  display: flex;
  justify-content: center;
  gap: 22px;
  margin-bottom: 16px;
}
.footer__social a {
  color: var(--text-dim);
  display: grid;
  place-items: center;
  transition: color var(--transition), transform var(--transition);
}
.footer__social a:hover { color: var(--accent); transform: translateY(-3px); }

/* experience footer link */
.experience__more { margin-top: 8px; text-align: center; }

/* ---------- reveal animation ---------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible { opacity: 1; transform: none; }

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

/* ---------- responsive ---------- */
@media (max-width: 1100px) {
  .nav__links {
    position: fixed;
    top: var(--nav-h);
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    background: var(--surface);
    border-left: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    padding: 24px 32px;
    gap: 18px;
    transform: translateX(100%);
    transition: transform var(--transition);
    border-radius: 0 0 0 var(--radius);
    box-shadow: var(--shadow);
  }
  .nav__links a { font-size: 0.95rem; }
  .nav__links.open { transform: none; }
  .nav__burger { display: flex; }
}

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; padding-top: calc(var(--nav-h) + 40px); min-height: auto; padding-bottom: 60px; }
  .hero__scroll { display: none; }
  .hero__terminal { max-width: 520px; }
  .about__grid { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  .section { padding: 64px 18px; }
  .cv__actions { margin-left: 0; }
  .terminal__body { font-size: 0.74rem; }
}