:root{
  --black: #0a0a0a;
  --white: #fafaf8;
  --line-on-dark: rgba(250,250,248,0.22);
  --line-on-light: rgba(10,10,10,0.16);
  --muted-on-dark: rgba(250,250,248,0.56);
  --muted-on-light: rgba(10,10,10,0.56);
  --display: "Archivo", sans-serif;
  --text: "Inter Tight", sans-serif;
  --pad: clamp(1.25rem, 5vw, 4.5rem);
  --edge: clamp(1.25rem, 5vw, 4.5rem);
}

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

html{ scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
  *{ animation-duration:0.001ms !important; animation-iteration-count:1 !important; transition-duration:0.001ms !important; }
}

body{
  font-family: var(--text);
  background: var(--white);
  color: var(--black);
  line-height: 1.4;
  overflow-x: hidden;
}

a{ color: inherit; text-decoration:none; }

/* ---------- VECTOR / OUTLINE TYPE ---------- */
/* Big titles rendered as outlined, contour-only letterforms —
   a poster/logotype treatment rather than plain filled text. */

.vector-text{
  color: transparent;
  -webkit-text-fill-color: transparent;
  -webkit-text-stroke-width: clamp(1.1px, 0.16vw, 2.6px);
  text-stroke-width: clamp(1.1px, 0.16vw, 2.6px);
  paint-order: stroke fill;
}
.bg-black .vector-text{
  -webkit-text-stroke-color: var(--white);
  text-stroke-color: var(--white);
}
.bg-white .vector-text{
  -webkit-text-stroke-color: var(--black);
  text-stroke-color: var(--black);
}
/* Fallback for engines without text-stroke support: solid fill instead of invisible text */
@supports not (-webkit-text-stroke: 1px black){
  .vector-text{ color: inherit; -webkit-text-fill-color: inherit; }
  .bg-black .vector-text{ color: var(--white); }
  .bg-white .vector-text{ color: var(--black); }
}

:focus-visible{
  outline: 2px solid currentColor;
  outline-offset: 4px;
}

section{
  position: relative;
  width: 100%;
  padding: clamp(3.5rem, 9vw, 7rem) var(--edge);
}

.bg-black{ background: var(--black); color: var(--white); }
.bg-white{ background: var(--white); color: var(--black); }

.rule{
  border: none;
  border-top: 1px solid var(--line-on-light);
  width: 100%;
}
.bg-black .rule{ border-top-color: var(--line-on-dark); }

/* ---------- HERO ---------- */

.hero{
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-top: clamp(2rem, 6vw, 4rem);
  padding-bottom: clamp(2rem, 6vw, 4rem);
}

.hero-mark{
  font-family: var(--display);
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: -0.045em;
  line-height: 0.82;
}

.hero-mark .line-a{
  font-size: clamp(4.5rem, 17vw, 15rem);
  opacity: 0;
  transform: translateY(0.4em);
  animation: rise 0.9s cubic-bezier(.16,1,.3,1) forwards;
}

.hero-mark .line-b{
  font-size: clamp(5.5rem, 20.5vw, 18.5rem);
  margin-left: clamp(0.5rem, 6vw, 3.5rem);
  opacity: 0;
  transform: translateY(0.4em);
  animation: rise 0.9s cubic-bezier(.16,1,.3,1) 0.12s forwards;
}

@keyframes rise{
  to{ opacity: 1; transform: translateY(0); }
}

.hero-foot{
  margin-top: clamp(3rem, 8vw, 6rem);
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.hero-foot-label{
  font-size: 0.85rem;
  letter-spacing: 0.02em;
  color: var(--muted-on-dark);
}

.hero-foot-label span{
  display:block;
  color: var(--white);
  font-weight: 600;
}

/* ---------- INTRO ---------- */

.intro-head{
  font-family: var(--display);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: -0.035em;
  line-height: 0.94;
  font-size: clamp(2.4rem, 6.4vw, 5.4rem);
  max-width: 18ch;
}

.intro-sub{
  margin-top: 1.75rem;
  max-width: 46ch;
  font-size: clamp(1rem, 1.4vw, 1.15rem);
  color: var(--muted-on-light);
}

.intro-stats{
  margin-top: clamp(3rem, 7vw, 5rem);
  display: grid;
  grid-template-columns: repeat(2, auto);
  gap: clamp(2rem, 6vw, 5rem);
  justify-content: start;
}

.stat-num{
  font-family: var(--display);
  font-weight: 900;
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  line-height: 1;
  letter-spacing: -0.03em;
}

.stat-label{
  margin-top: 0.5rem;
  font-size: 0.8rem;
  letter-spacing: 0.03em;
  color: var(--muted-on-light);
}

@media (max-width: 560px){
  .intro-stats{ grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }
}

/* ---------- MODULE SECTIONS ---------- */

.module{
  display: grid;
  grid-template-columns: minmax(0,1fr);
  gap: clamp(2rem, 5vw, 3rem);
}

.module-head{
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: start;
  gap: clamp(1rem, 4vw, 3rem);
}

.module-num{
  font-family: var(--display);
  font-weight: 900;
  font-size: clamp(3.5rem, 9vw, 8rem);
  line-height: 0.8;
  opacity: 0.94;
}

.module-title{
  font-family: var(--display);
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: -0.045em;
  line-height: 0.86;
  font-size: clamp(2.6rem, 8vw, 6.5rem);
}

.module-title span{ display: block; }

.module-desc{
  margin-top: 1.5rem;
  font-size: clamp(1rem, 1.5vw, 1.2rem);
  max-width: 48ch;
}
.bg-black .module-desc{ color: var(--muted-on-dark); }
.bg-white .module-desc{ color: var(--muted-on-light); }

.topic-list{
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
  border-top: 1px solid var(--line-on-light);
}
.bg-black .topic-list{ border-top-color: var(--line-on-dark); }

.topic-row{
  border-bottom: 1px solid var(--line-on-light);
  padding: clamp(0.9rem, 2.4vw, 1.5rem) 0;
  cursor: default;
}
.bg-black .topic-row{ border-bottom-color: var(--line-on-dark); }

.topic-row-top{
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
}

.topic-name{
  font-family: var(--display);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: -0.02em;
  font-size: clamp(1.05rem, 2.6vw, 1.75rem);
  transition: transform 0.35s cubic-bezier(.16,1,.3,1);
}

.topic-arrow{
  font-family: var(--display);
  font-size: clamp(1.05rem, 2.6vw, 1.6rem);
  flex-shrink: 0;
  transition: transform 0.35s cubic-bezier(.16,1,.3,1);
}

.topic-row:hover .topic-name,
.topic-row:focus-within .topic-name{
  transform: translateX(clamp(6px, 1vw, 14px));
}
.topic-row:hover .topic-arrow,
.topic-row:focus-within .topic-arrow{
  transform: translateX(10px);
}

.topic-hint{
  max-height: 0;
  overflow: hidden;
  font-size: 0.95rem;
  transition: max-height 0.35s ease, opacity 0.35s ease, margin-top 0.35s ease;
  opacity: 0;
}
.bg-black .topic-hint{ color: var(--muted-on-dark); }
.bg-white .topic-hint{ color: var(--muted-on-light); }

.topic-row:hover .topic-hint,
.topic-row:focus-within .topic-hint{
  max-height: 3.5em;
  opacity: 1;
  margin-top: 0.6rem;
}

/* module-specific compositions */

.stack-word{
  display: block;
}

.stacked-final{
  margin-top: clamp(2rem, 5vw, 3rem);
  font-family: var(--display);
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: -0.03em;
  font-size: clamp(1.8rem, 5.5vw, 3.2rem);
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
  color: var(--muted-on-dark);
}
.stacked-final .plus{ font-weight: 400; opacity: 0.5; }

/* ---------- TOPIC INDEX / MARQUEE ---------- */

.index-section{
  padding-left: 0;
  padding-right: 0;
}

.index-head{
  padding: 0 var(--edge);
  text-align: center;
}

.index-num{
  font-family: var(--display);
  font-weight: 900;
  font-size: clamp(3.5rem, 12vw, 8rem);
  line-height: 0.85;
  letter-spacing: -0.03em;
}

.index-label{
  font-family: var(--display);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: -0.02em;
  font-size: clamp(1.5rem, 4vw, 2.6rem);
}

.marquee-wrap{
  margin-top: clamp(2rem, 6vw, 4rem);
  overflow: hidden;
  border-top: 1px solid var(--line-on-light);
  border-bottom: 1px solid var(--line-on-light);
  padding: clamp(1rem, 2.5vw, 1.5rem) 0;
}

.hero-ticker{
  padding: 0 var(--edge);
}
.hero-ticker .marquee-wrap{ margin-top: 0; }

.marquee-track{
  display: flex;
  width: max-content;
  animation: scroll-left 42s linear infinite;
}

.marquee-track--modules{
  animation-duration: 16s;
}

.marquee-wrap:hover .marquee-track,
.marquee-wrap:focus-within .marquee-track{
  animation-play-state: paused;
}

@media (prefers-reduced-motion: reduce){
  .marquee-track{ animation: none; }
  .marquee-wrap{ overflow-x: auto; }
}

@keyframes scroll-left{
  from{ transform: translateX(0); }
  to{ transform: translateX(-50%); }
}

.marquee-track a,
.marquee-track span{
  font-family: var(--display);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: -0.01em;
  font-size: clamp(1.1rem, 3vw, 2rem);
  padding: 0 clamp(1rem, 2.5vw, 2rem);
  white-space: nowrap;
  color: var(--muted-on-light);
}
.marquee-track a{
  cursor: pointer;
  transition: color 0.2s ease;
}
.marquee-track a:hover,
.marquee-track a:focus-visible{
  color: var(--black);
}
.marquee-track span.sep{
  color: var(--line-on-light);
  padding: 0 clamp(0.5rem, 1.5vw, 1rem);
}

/* ---------- OPERATOR ---------- */

.operator-section{
  text-align: center;
}

.operator-sub{
  margin: 1.5rem auto 0;
  max-width: 34ch;
  font-size: clamp(1rem, 1.6vw, 1.2rem);
  color: var(--muted-on-dark);
}

.operator-flow{
  margin: clamp(2.5rem, 6vw, 4rem) auto 0;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--display);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.01em;
  font-size: clamp(0.85rem, 1.8vw, 1.1rem);
  color: var(--muted-on-dark);
}

/* ---------- CTA ---------- */

.cta-section{
  min-height: 70svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.cta-title{
  font-family: var(--display);
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: -0.04em;
  line-height: 0.9;
  font-size: clamp(2.6rem, 9vw, 6.5rem);
}

.cta-row{
  margin-top: clamp(2rem, 6vw, 3.5rem);
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 1.5rem;
  flex-wrap: wrap;
  border-top: 1px solid var(--line-on-light);
  padding-top: clamp(1.5rem, 4vw, 2rem);
}

.cta-link{
  font-family: var(--display);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: -0.01em;
  font-size: clamp(1.3rem, 3.5vw, 2rem);
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  border-bottom: 2px solid var(--black);
  padding-bottom: 0.15em;
  transition: gap 0.3s cubic-bezier(.16,1,.3,1);
}
.cta-link:hover, .cta-link:focus-visible{ gap: 1.1rem; }

.cta-meta{
  font-size: 0.85rem;
  color: var(--muted-on-light);
  line-height: 1.6;
  text-align: right;
}

/* ---------- LANDING (pojedynczy kurs) ---------- */

.landing-hero{
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: clamp(1.5rem, 4vw, 2.5rem);
}

.landing-back{
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  align-self: flex-start;
  font-family: var(--text);
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--muted-on-dark);
  text-decoration: none;
  transition: color 0.2s ease;
}
.landing-back::before{
  content: "←";
  font-family: var(--display);
}
.landing-back:hover,
.landing-back:focus-visible{
  color: var(--white);
}

.landing-title{
  font-family: var(--display);
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: -0.04em;
  line-height: 0.94;
  font-size: clamp(2.4rem, 7vw, 5.8rem);
  max-width: 20ch;
}

.landing-desc-section{
  padding-top: clamp(3rem, 8vw, 6rem);
  padding-bottom: clamp(3rem, 8vw, 6rem);
}

.landing-desc{
  font-family: var(--text);
  font-weight: 400;
  font-size: clamp(1.05rem, 1.7vw, 1.35rem);
  line-height: 1.75;
  max-width: 68ch;
  color: var(--black);
}