/* ==========================================================================
   Marta Sługocka — Portfolio prototype
   Palette: espresso #28221d · rust #952f14 · cream #fffdf6 · taupe #dbd3c9
   ========================================================================== */

:root {
  --espresso: #28221d;
  --espresso-soft: #3a322a;
  --rust: #952f14;
  --rust-dark: #741f0a;
  --rust-soft: rgba(149, 47, 20, 0.1);
  --cream: #fffdf6;
  --taupe: #dbd3c9;
  --taupe-line: rgba(40, 34, 29, 0.14);
  --taupe-line-soft: rgba(40, 34, 29, 0.08);
  --on-espresso: rgba(255, 253, 246, 0.86);
  --on-espresso-soft: rgba(255, 253, 246, 0.58);

  --font-display: 'Fraunces', Georgia, 'Times New Roman', serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --container: 1180px;
  --section-pad: clamp(4rem, 9vw, 8rem);
  --nav-h: 76px;

  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: var(--nav-h); }
body {
  margin: 0;
  background: var(--cream);
  color: var(--espresso);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol, dl, dd { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, p { margin: 0; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; padding: 0; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---------- Layout helpers ---------- */
.section-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 4vw, 3rem);
}
.eyebrow {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--rust);
  margin-bottom: 0.9rem;
}
.eyebrow--light { color: #d98a6f; }
.section-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.8rem, 3.6vw, 2.8rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
  max-width: 18ch;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--espresso);
  color: var(--cream);
  padding: 0.75rem 1.25rem;
  z-index: 200;
}
.skip-link:focus {
  left: 1rem;
  top: 1rem;
}

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

/* ---------- Scroll progress ---------- */
.scroll-progress {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 3px;
  z-index: 110;
  background: transparent;
  pointer-events: none;
}
.scroll-progress__bar {
  height: 100%;
  width: 0%;
  background: var(--rust);
  transition: width 0.08s linear;
}

/* ---------- Nav ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  background: rgba(255, 253, 246, 0.7);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: background 0.3s var(--ease), border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}
.nav.is-scrolled {
  background: rgba(255, 253, 246, 0.92);
  border-bottom-color: var(--taupe-line);
  box-shadow: 0 4px 24px rgba(40, 34, 29, 0.05);
}
.nav__inner {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 4vw, 3rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}
.nav__wordmark {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
  white-space: nowrap;
}
.nav__links {
  display: flex;
  gap: clamp(1.25rem, 2.5vw, 2.25rem);
  font-size: 0.92rem;
  font-weight: 500;
}
.nav__links a {
  position: relative;
  padding: 0.3rem 0;
}
.nav__links a::after {
  content: '';
  position: absolute;
  left: 0; bottom: -2px;
  width: 100%; height: 1.5px;
  background: var(--rust);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s var(--ease);
}
.nav__links a:hover::after,
.nav__links a:focus-visible::after { transform: scaleX(1); }

.nav__actions { display: flex; align-items: center; gap: 1rem; }

.lang-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  border: 1px solid var(--taupe-line);
  border-radius: 999px;
  padding: 0.4rem 0.75rem;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}
.lang-toggle:hover { border-color: var(--rust); background: var(--rust-soft); }
.lang-toggle__opt { opacity: 0.4; transition: opacity 0.2s var(--ease), color 0.2s var(--ease); }
.lang-toggle__sep { opacity: 0.35; }
html[data-lang="pl"] .lang-toggle__opt[data-lang-opt="pl"],
html[data-lang="en"] .lang-toggle__opt[data-lang-opt="en"] {
  opacity: 1;
  color: var(--rust);
}

.nav__burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
}
.nav__burger span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--espresso);
  border-radius: 2px;
  transition: transform 0.25s var(--ease), opacity 0.25s var(--ease);
}
.nav__burger[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__burger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav__burger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1.6rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.2s var(--ease), background 0.2s var(--ease), color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}
.btn--primary {
  background: var(--rust);
  color: var(--cream);
  box-shadow: 0 6px 20px rgba(149, 47, 20, 0.25);
}
.btn--primary:hover { background: var(--rust-dark); transform: translateY(-2px); }
.btn--ghost {
  border: 1.5px solid var(--taupe-line);
  color: var(--espresso);
}
.btn--ghost:hover { border-color: var(--rust); color: var(--rust); transform: translateY(-2px); }

/* ---------- Reveal-on-scroll ---------- */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; }
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-h);
  overflow: hidden;
}
.hero__grain {
  position: absolute;
  inset: 0;
  opacity: 0.5;
  pointer-events: none;
  background-image:
    radial-gradient(circle at 15% 20%, rgba(149,47,20,0.06), transparent 45%),
    radial-gradient(circle at 85% 75%, rgba(219,211,201,0.6), transparent 50%);
}
.hero__inner { position: relative; padding-top: clamp(2rem, 6vw, 3rem); padding-bottom: clamp(3rem, 6vw, 4rem); }
.hero__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(2.6rem, 7vw, 5.2rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0 0 1.5rem;
  max-width: 16ch;
}
.hero__title--accent { color: var(--rust); font-style: italic; font-weight: 500; }
.hero__tagline {
  font-size: clamp(1.05rem, 1.6vw, 1.25rem);
  max-width: 46ch;
  color: var(--espresso-soft);
  margin-bottom: 2.25rem;
}
.hero__cta { display: flex; gap: 1rem; flex-wrap: wrap; margin-bottom: 3.5rem; }

.hero__stats {
  display: flex;
  gap: clamp(1.75rem, 4vw, 3.5rem);
  flex-wrap: wrap;
  padding-top: 2rem;
  border-top: 1px solid var(--taupe-line);
}
.stat__value {
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 600;
  color: var(--rust);
}
.stat__label {
  font-size: 0.85rem;
  color: var(--espresso-soft);
  max-width: 14ch;
}

.hero__scroll-cue {
  position: absolute;
  bottom: clamp(1.25rem, 3vw, 2.25rem);
  left: 50%;
  transform: translateX(-50%);
  width: 26px; height: 42px;
  border: 1.5px solid var(--taupe-line);
  border-radius: 999px;
  display: flex;
  justify-content: center;
  padding-top: 8px;
}
.hero__scroll-cue span {
  width: 4px; height: 8px;
  border-radius: 2px;
  background: var(--rust);
  animation: cue-bounce 1.8s ease-in-out infinite;
}
@keyframes cue-bounce {
  0%, 100% { transform: translateY(0); opacity: 1; }
  50% { transform: translateY(10px); opacity: 0.4; }
}
@media (prefers-reduced-motion: reduce) {
  .hero__scroll-cue span { animation: none; }
}

/* ---------- About ---------- */
.about { padding: var(--section-pad) 0; background: var(--cream); }
.about__intro { margin-bottom: clamp(2.5rem, 5vw, 3.5rem); }
.about__body {
  display: grid;
  grid-template-columns: minmax(200px, 320px) 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
}
.portrait-placeholder {
  aspect-ratio: 3/4;
  border-radius: 18px;
  background:
    repeating-linear-gradient(135deg, var(--taupe), var(--taupe) 10px, #e6e0d7 10px, #e6e0d7 20px);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 1.5rem;
  color: var(--espresso-soft);
  font-size: 0.85rem;
  border: 1px solid var(--taupe-line);
}
.about__text p { margin-bottom: 1.25rem; color: var(--espresso-soft); font-size: 1.02rem; }
.lang-list { display: flex; flex-direction: column; gap: 0.6rem; margin-top: 1.75rem; }
.lang-list li {
  display: flex;
  justify-content: space-between;
  max-width: 320px;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--taupe-line-soft);
  font-size: 0.95rem;
}
.lang-list__name { font-weight: 600; }
.lang-list__level { color: var(--rust); font-weight: 600; }

/* ---------- Work / Case studies ---------- */
.work { padding: var(--section-pad) 0; background: var(--taupe); }
.work__intro { max-width: 640px; margin-bottom: clamp(3rem, 6vw, 4.5rem); }
.work__lede { margin-top: 1.25rem; font-size: 1.05rem; color: var(--espresso-soft); }

.case-list { display: flex; flex-direction: column; gap: clamp(3rem, 6vw, 5rem); }

.case-card {
  position: relative;
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: clamp(1.75rem, 4vw, 3.5rem);
  align-items: center;
  background: var(--cream);
  border-radius: 22px;
  padding: clamp(1.5rem, 3vw, 2.75rem);
  border: 1px solid var(--taupe-line);
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease);
  overflow: hidden;
}
.case-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 22px 50px rgba(40, 34, 29, 0.12);
}
.case-card:nth-child(even) { grid-template-columns: 1fr 1.05fr; }
.case-card:nth-child(even) .case-card__visual { order: 2; }
.case-card:nth-child(even) .case-card__body { order: 1; }

.case-card__ghost {
  position: absolute;
  top: -0.5rem;
  right: 1rem;
  font-family: var(--font-display);
  font-size: clamp(6rem, 12vw, 10rem);
  font-weight: 600;
  color: var(--espresso);
  opacity: 0.04;
  line-height: 1;
  pointer-events: none;
  z-index: 0;
}

.case-card__visual { position: relative; z-index: 1; }
.case-visual-placeholder {
  aspect-ratio: 16/9;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--taupe) 0%, #eee8de 55%, var(--taupe) 100%);
  border: 1px solid var(--taupe-line);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 1.5rem;
  color: var(--espresso-soft);
  font-size: 0.85rem;
  overflow: hidden;
  transition: transform 0.4s var(--ease);
}
.case-card:hover .case-visual-placeholder { transform: scale(1.03); }

.case-card__body { position: relative; z-index: 1; }
.case-card__num {
  display: inline-block;
  font-family: var(--font-display);
  color: var(--rust);
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 0.6rem;
}
.case-card__client {
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 2.2vw, 1.7rem);
  font-weight: 600;
  margin-bottom: 0.3rem;
}
.case-card__role {
  font-size: 0.88rem;
  color: var(--espresso-soft);
  margin-bottom: 1rem;
}
.case-card__challenge {
  font-size: 1rem;
  color: var(--espresso-soft);
  margin-bottom: 1.5rem;
  max-width: 46ch;
}

.result-chips {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  margin-bottom: 1.4rem;
}
.result-chips li {
  display: flex;
  gap: 0.6rem;
  align-items: baseline;
  font-size: 0.92rem;
}
.result-chips strong {
  color: var(--rust);
  font-weight: 700;
  white-space: nowrap;
}
.result-chips span { color: var(--espresso-soft); }

.tag-list { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1.4rem; }
.tag-list li {
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  background: var(--taupe);
  color: var(--espresso-soft);
}
.tag-list--skill li { background: var(--rust-soft); color: var(--rust-dark); }

.learning {
  background: var(--rust-soft);
  border-left: 3px solid var(--rust);
  padding: 0.9rem 1.1rem;
  border-radius: 0 10px 10px 0;
  font-size: 0.9rem;
  margin-bottom: 1.4rem;
  color: var(--espresso-soft);
}
.learning__label {
  display: block;
  font-weight: 700;
  color: var(--rust);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.3rem;
}

.case-card__link {
  display: inline-flex;
  align-items: center;
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--espresso);
  position: relative;
  padding-bottom: 2px;
}
.case-card__link::after {
  content: '';
  position: absolute;
  left: 0; bottom: 0;
  width: 100%; height: 1.5px;
  background: var(--rust);
  transform: scaleX(0.35);
  transform-origin: left;
  transition: transform 0.25s var(--ease), background 0.25s var(--ease);
}
.case-card__link:hover { color: var(--rust); }
.case-card__link:hover::after { transform: scaleX(1); }

@media (max-width: 860px) {
  .case-card,
  .case-card:nth-child(even) {
    grid-template-columns: 1fr;
  }
  .case-card:nth-child(even) .case-card__visual,
  .case-card:nth-child(even) .case-card__body { order: initial; }
}

/* ---------- Skills ---------- */
.skills { padding: var(--section-pad) 0; background: var(--cream); }
.skills__intro { margin-bottom: clamp(2.5rem, 5vw, 3.5rem); }
.skills__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: clamp(1.75rem, 3vw, 2.5rem);
}
.skill-group h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.9rem;
}

/* ---------- Certificates ---------- */
.certs { padding: clamp(3rem, 6vw, 5rem) 0; background: var(--espresso); color: var(--on-espresso); }
.certs__intro { margin-bottom: 1.75rem; }
.certs__list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 0.75rem 2rem;
}
.certs__list li {
  display: flex;
  gap: 0.9rem;
  padding: 0.7rem 0;
  border-bottom: 1px solid rgba(255,253,246,0.1);
  font-size: 0.92rem;
}
.certs__year {
  color: #d98a6f;
  font-weight: 700;
  min-width: 4.2rem;
  flex-shrink: 0;
}
.certs__list em { color: var(--on-espresso-soft); font-style: normal; }

/* ---------- Contact ---------- */
.contact { padding: var(--section-pad) 0; background: var(--espresso); color: var(--on-espresso); }
.contact__inner { text-align: center; max-width: 620px; }
.contact__heading {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4.5vw, 3rem);
  font-weight: 600;
  margin-bottom: 1.25rem;
  line-height: 1.15;
}
.contact__lede { color: var(--on-espresso-soft); font-size: 1.05rem; margin-bottom: 2.5rem; }
.contact__links { display: flex; flex-direction: column; align-items: center; gap: 1rem; }
.contact__link {
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 2.5vw, 1.6rem);
  font-weight: 500;
  position: relative;
  padding-bottom: 3px;
}
.contact__link::after {
  content: '';
  position: absolute;
  left: 0; bottom: 0;
  width: 100%; height: 1.5px;
  background: #d98a6f;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s var(--ease);
}
.contact__link:hover::after { transform: scaleX(1); }
.contact__link--muted { font-family: var(--font-body); font-size: 0.92rem; color: var(--on-espresso-soft); font-weight: 500; }

/* ---------- Footer ---------- */
.footer { background: var(--espresso); color: var(--on-espresso-soft); padding: 1.5rem 0 2.25rem; }
.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255,253,246,0.1);
}
.footer__top { font-weight: 600; }
.footer__top:hover { color: #d98a6f; }

/* ---------- Responsive nav ---------- */
@media (max-width: 760px) {
  .nav__burger { display: flex; }
  .nav__links {
    position: fixed;
    top: var(--nav-h);
    left: 0; right: 0;
    background: var(--cream);
    border-bottom: 1px solid var(--taupe-line);
    flex-direction: column;
    gap: 0;
    padding: 0.5rem clamp(1.25rem, 4vw, 3rem) 1rem;
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.25s var(--ease), transform 0.25s var(--ease), visibility 0.25s;
  }
  .nav__links.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }
  .nav__links a { padding: 0.85rem 0; border-bottom: 1px solid var(--taupe-line-soft); }
  .nav__links a:last-child { border-bottom: none; }

  .about__body { grid-template-columns: 1fr; }
  .portrait-placeholder { max-width: 260px; aspect-ratio: 4/3; }
}

@media (max-width: 480px) {
  .hero__cta { flex-direction: column; align-items: stretch; }
  .hero__cta .btn { justify-content: center; }
  .contact__links { width: 100%; }
}