/* ------------------------------------------------------------------
   Design tokens
------------------------------------------------------------------ */
:root {
  --bg: #fafafa;
  --bg-elev: #ffffff;
  --text: #121317;
  --text-muted: #62636c;
  --text-faint: #9a9ba5;
  --border: rgba(18, 19, 23, 0.09);
  --border-strong: rgba(18, 19, 23, 0.18);
  --accent: #4f46e5;
  --accent-soft: rgba(79, 70, 229, 0.10);
  --accent-contrast: #ffffff;
  --shadow: 0 1px 2px rgba(18, 19, 23, 0.04), 0 12px 32px -16px rgba(18, 19, 23, 0.18);
  --shadow-hover: 0 2px 4px rgba(18, 19, 23, 0.05), 0 24px 48px -20px rgba(18, 19, 23, 0.28);
  --glow: radial-gradient(60% 60% at 50% 0%, rgba(79, 70, 229, 0.16), transparent 70%);
  --nav-bg: rgba(250, 250, 250, 0.78);

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

  --container: 1080px;
  --gutter: 16px;
  --radius: 16px;
  --radius-sm: 10px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0b0c10;
    --bg-elev: #13141a;
    --text: #ececf1;
    --text-muted: #a0a1ac;
    --text-faint: #6b6c78;
    --border: rgba(236, 236, 241, 0.09);
    --border-strong: rgba(236, 236, 241, 0.18);
    --accent: #8b85f5;
    --accent-soft: rgba(139, 133, 245, 0.14);
    --accent-contrast: #0b0c10;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 12px 32px -16px rgba(0, 0, 0, 0.7);
    --shadow-hover: 0 2px 4px rgba(0, 0, 0, 0.5), 0 24px 48px -20px rgba(0, 0, 0, 0.8);
    --glow: radial-gradient(60% 60% at 50% 0%, rgba(139, 133, 245, 0.22), transparent 70%);
    --nav-bg: rgba(11, 12, 16, 0.72);
  }
}

:root[data-theme="dark"] {
  --bg: #0b0c10;
  --bg-elev: #13141a;
  --text: #ececf1;
  --text-muted: #a0a1ac;
  --text-faint: #6b6c78;
  --border: rgba(236, 236, 241, 0.09);
  --border-strong: rgba(236, 236, 241, 0.18);
  --accent: #8b85f5;
  --accent-soft: rgba(139, 133, 245, 0.14);
  --accent-contrast: #0b0c10;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 12px 32px -16px rgba(0, 0, 0, 0.7);
  --shadow-hover: 0 2px 4px rgba(0, 0, 0, 0.5), 0 24px 48px -20px rgba(0, 0, 0, 0.8);
  --glow: radial-gradient(60% 60% at 50% 0%, rgba(139, 133, 245, 0.22), transparent 70%);
  --nav-bg: rgba(11, 12, 16, 0.72);
}

/* ------------------------------------------------------------------
   Base
------------------------------------------------------------------ */
*, *::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: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  transition: background-color .3s var(--ease), color .3s var(--ease);
}

h1, h2, h3 {
  margin: 0;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
}

p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
svg.icon { width: 18px; height: 18px; flex: none; }

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 6px;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -60px;
  padding: 10px 14px;
  background: var(--accent);
  color: var(--accent-contrast);
  border-radius: 8px;
  z-index: 100;
  font-weight: 600;
}
.skip-link:focus { top: 16px; }

/* ------------------------------------------------------------------
   Nav
------------------------------------------------------------------ */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--nav-bg);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s var(--ease);
}
.nav.is-scrolled { border-bottom-color: var(--border); }

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: 64px;
}

.nav__brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.nav__mark {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 9px;
  background: var(--accent);
  color: var(--accent-contrast);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: -0.04em;
}
.nav__name { font-size: 15px; }

.nav__links {
  display: none;
  gap: 4px;
}
.nav__links a {
  padding: 8px 12px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  transition: color .2s, background-color .2s;
}
.nav__links a:hover { color: var(--text); background: var(--accent-soft); }

.nav__actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.lang {
  display: inline-flex;
  padding: 3px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg-elev);
}
.lang__btn {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--text-muted);
  font: inherit;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 5px 10px;
  border-radius: 999px;
  cursor: pointer;
  transition: background-color .2s, color .2s;
}
.lang__btn[aria-pressed="true"] {
  background: var(--text);
  color: var(--bg);
}

.theme-toggle {
  appearance: none;
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg-elev);
  color: var(--text);
  cursor: pointer;
  transition: border-color .2s, transform .2s var(--ease);
}
.theme-toggle:hover { border-color: var(--border-strong); transform: rotate(15deg); }
.theme-toggle .icon--moon { display: none; }
:root[data-theme="dark"] .theme-toggle .icon--sun { display: none; }
:root[data-theme="dark"] .theme-toggle .icon--moon { display: block; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .icon--sun { display: none; }
  :root:not([data-theme="light"]) .theme-toggle .icon--moon { display: block; }
}

/* ------------------------------------------------------------------
   Buttons, badges, tags
------------------------------------------------------------------ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 18px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1;
  border: 1px solid transparent;
  transition: transform .2s var(--ease), box-shadow .2s var(--ease), background-color .2s, border-color .2s;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn--primary {
  background: var(--accent);
  color: var(--accent-contrast);
  box-shadow: 0 8px 24px -12px var(--accent);
}
.btn--primary:hover { box-shadow: 0 12px 28px -12px var(--accent); }
.btn--ghost {
  background: var(--bg-elev);
  border-color: var(--border);
  color: var(--text);
}
.btn--ghost:hover { border-color: var(--border-strong); }
.btn--lg { padding: 16px 24px; font-size: 16px; }

.badge {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.02em;
  color: var(--text-muted);
  padding: 4px 8px;
  border-radius: 999px;
  border: 1px solid var(--border);
  white-space: nowrap;
}
.badge--accent { color: var(--accent); border-color: transparent; background: var(--accent-soft); }

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.tags li {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  padding: 5px 10px;
  border-radius: 8px;
  background: var(--accent-soft);
  color: var(--text);
}
.tags--mono li {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 3px 8px;
  border-radius: 6px;
}

.card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s;
}

/* ------------------------------------------------------------------
   Hero
------------------------------------------------------------------ */
.hero {
  position: relative;
  padding: 88px 0 72px;
  overflow: hidden;
}
.hero__glow {
  position: absolute;
  inset: -64px 0 0 0;
  background: var(--glow);
  pointer-events: none;
}
.hero__glow::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--border) 1px, transparent 1px),
    linear-gradient(to bottom, var(--border) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(60% 60% at 50% 0%, #000, transparent 80%);
  -webkit-mask-image: radial-gradient(60% 60% at 50% 0%, #000, transparent 80%);
  opacity: .5;
}
.hero .container { position: relative; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 24px;
}
.eyebrow__dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
}

.hero__title {
  font-size: clamp(44px, 9vw, 96px);
  font-weight: 800;
  letter-spacing: -0.045em;
  line-height: 0.98;
  margin-bottom: 28px;
}

.hero__lead {
  max-width: 620px;
  font-size: clamp(17px, 2.2vw, 20px);
  line-height: 1.55;
  color: var(--text-muted);
  margin-bottom: 36px;
}

.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 56px;
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, auto);
  gap: 32px;
  margin: 0;
  justify-content: start;
}
.stat dt {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--text-faint);
  text-transform: uppercase;
  margin-bottom: 6px;
}
.stat dd {
  margin: 0;
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1;
}

/* ------------------------------------------------------------------
   Sections
------------------------------------------------------------------ */
.section { padding: 72px 0; }

.section__head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 36px;
}
.section__index {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--accent);
}
.section__head h2 {
  font-size: clamp(28px, 4vw, 40px);
  letter-spacing: -0.03em;
}

/* About */
.about {
  display: grid;
  gap: 20px;
  max-width: 760px;
}
.about__lead {
  font-size: clamp(19px, 2.4vw, 24px);
  line-height: 1.45;
  letter-spacing: -0.015em;
}
.about p:not(.about__lead) { color: var(--text-muted); font-size: 17px; }

/* Skills */
.skills {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}
.skill { padding: 22px; }
.skill:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); border-color: var(--border-strong); }
.skill__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}
.skill__head h3 { font-size: 17px; }

/* Portfolio */
.projects {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}
.project {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;  /* długi adres w nagłówku nie może rozpychać kolumny siatki */
}
.project:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); border-color: var(--border-strong); }
.project__visual {
  position: relative;
  aspect-ratio: 16 / 9;
  display: grid;
  place-items: center;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
}
.project__visual::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(255,255,255,.12) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,.12) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: radial-gradient(70% 90% at 50% 50%, #000, transparent);
  -webkit-mask-image: radial-gradient(70% 90% at 50% 50%, #000, transparent);
}
.project__visual--malmistrz { background: linear-gradient(135deg, #f59e0b 0%, #ef4444 55%, #7c3aed 100%); }
.project__visual--inwentarz { background: linear-gradient(135deg, #0ea5e9 0%, #4f46e5 55%, #0f172a 100%); }
.project__brand {
  position: relative;
  font-family: var(--font-mono);
  font-size: clamp(22px, 4vw, 34px);
  font-weight: 500;
  color: #fff;
  letter-spacing: -0.02em;
  text-shadow: 0 2px 20px rgba(0,0,0,.25);
  transition: transform .4s var(--ease);
}
.project:hover .project__brand { transform: scale(1.04); }
.project__body {
  display: grid;
  gap: 14px;
  padding: 22px;
}
.project__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 8px 12px;
}
.project__head h3 { font-size: 22px; }
.project__title { display: flex; align-items: center; flex-wrap: wrap; gap: 6px 10px; }
.project__link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding-top: 6px;  /* linia tekstu na wysokości tytułu (h3 22px) */
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-muted);
  transition: color .2s;
}
.project:hover .project__link { color: var(--accent); }
.project__link span { overflow-wrap: anywhere; }
.project__link .icon { width: 16px; height: 16px; transition: transform .2s var(--ease); }
.project:hover .project__link .icon { transform: translate(2px, -2px); }
.project__body p { color: var(--text-muted); font-size: 15px; }

/* Experience */
.timeline {
  display: grid;
  gap: 0;
  border-left: 1px solid var(--border);
  margin-left: 6px;
}
.job {
  position: relative;
  display: grid;
  gap: 8px;
  padding: 0 0 40px 28px;
}
.job:last-child { padding-bottom: 0; }
.job::before {
  content: "";
  position: absolute;
  left: -6.5px;
  top: 7px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
}
.job:first-child::before { background: var(--accent); box-shadow: 0 0 0 4px var(--accent-soft); }
.job__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
}
.job__dates {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-faint);
}
.job__company { font-weight: 600; font-size: 15px; }
.job__body { display: grid; gap: 14px; }
.job__body h3 { font-size: 19px; letter-spacing: -0.02em; }
.job__points { display: grid; gap: 6px; color: var(--text-muted); font-size: 15px; }
.job__points li { position: relative; padding-left: 16px; }
.job__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 6px;
  height: 1.5px;
  background: var(--accent);
}

/* Education */
.edu {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}
.edu__item { padding: 22px; display: grid; gap: 8px; align-content: start; }
.edu__dates { font-family: var(--font-mono); font-size: 13px; color: var(--text-faint); }
.edu__item h3 { font-size: 18px; }
.edu__item > p { color: var(--text-muted); }
.edu__points { display: grid; gap: 4px; margin-top: 6px; color: var(--text-muted); font-size: 14px; }
.edu__points li { position: relative; padding-left: 14px; }
.edu__points li::before { content: ""; position: absolute; left: 0; top: 10px; width: 6px; height: 1.5px; background: var(--accent); }
.certs { display: grid; gap: 12px; margin-top: 6px; }
.certs li { display: grid; gap: 2px; padding: 12px 14px; border-radius: var(--radius-sm); background: var(--accent-soft); }
.certs strong { font-size: 12px; letter-spacing: .04em; text-transform: uppercase; color: var(--accent); }
.certs span { font-size: 15px; font-weight: 500; }

/* Contact */
.section--contact { padding-bottom: 96px; }
.contact {
  display: grid;
  gap: 16px;
  padding: 48px 24px;
  border-radius: 24px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  text-align: left;
  position: relative;
  overflow: hidden;
}
.contact::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--glow);
  opacity: .8;
  pointer-events: none;
}
.contact > * { position: relative; }
.contact h2 { font-size: clamp(30px, 5vw, 48px); letter-spacing: -0.035em; }
.contact p { color: var(--text-muted); font-size: 17px; max-width: 560px; }
.contact__links { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 8px; }
.contact__links .btn { white-space: normal; word-break: break-all; }

/* Footer */
.footer { border-top: 1px solid var(--border); padding: 28px 0; }
.footer__inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 16px;
  font-size: 13px;
  color: var(--text-faint);
}

/* ------------------------------------------------------------------
   Reveal on scroll
------------------------------------------------------------------ */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
}
.reveal.is-visible { opacity: 1; transform: none; }
.no-js .reveal { opacity: 1; transform: none; }

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

/* ------------------------------------------------------------------
   Responsive
------------------------------------------------------------------ */
@media (min-width: 640px) {
  :root { --gutter: 24px; }
  .skills { grid-template-columns: repeat(2, 1fr); }
  .edu { grid-template-columns: 1fr 1fr; }
  .contact { padding: 64px 48px; }
}

@media (min-width: 900px) {
  .nav__links { display: flex; }
  .hero { padding: 128px 0 96px; }
  .section { padding: 96px 0; }
  .skills { grid-template-columns: repeat(3, 1fr); }
  .skill--wide { grid-column: 1 / -1; display: flex; align-items: center; gap: 32px; }
  .skill--wide .skill__head { margin-bottom: 0; flex: 0 0 240px; }
  .projects { grid-template-columns: 1fr 1fr; }
  .job {
    grid-template-columns: 200px 1fr;
    gap: 24px;
    padding-left: 32px;
  }
  .job__meta { flex-direction: column; align-items: flex-start; gap: 4px; padding-top: 3px; }
  .stats { gap: 56px; }
}