/* ============================================================
   StealthTrack — design tokens
   ============================================================ */
:root {
  --color-white: #ffffff;
  --color-bg-soft: #f4f4f5;
  --color-bg-soft-2: #eceeef;
  --color-border: #e2e3e6;
  --color-border-strong: #d4d6da;

  --color-ink: #0c0d0f;
  --color-graphite-900: #16171a;
  --color-graphite-800: #212327;
  --color-graphite-700: #34363b;

  --color-text: #1a1b1e;
  --color-text-muted: #55585e;
  --color-text-invert: #f4f4f5;
  --color-text-invert-muted: #b7b9bd;

  --color-accent: #FE6507;
  --color-accent-dark: #d6560a;
  --color-accent-text: #c04d06; /* AA-safe (4.5:1 on white) variant of --color-accent for small on-light text */
  --color-on-accent: #14110d;

  --color-success-text: #1f7a45;
  --color-error-text: #c0392b;

  --container-w: 1200px;
  --header-h: 76px;
  --radius-sm: 4px;
  --radius-md: 10px;

  --shadow-sm: 0 1px 2px rgba(12, 13, 15, 0.06), 0 1px 1px rgba(12, 13, 15, 0.04);
  --shadow-md: 0 16px 40px -22px rgba(12, 13, 15, 0.45);

  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-heading: "Space Grotesk", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

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

/* ============================================================
   Reset
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

@media (max-width: 640px) {
  html { font-size: 14px; }
}
body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-white);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, video { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; padding: 0; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }
h1, h2, h3, h4 { font-family: var(--font-heading); font-weight: 600; line-height: 1.15; letter-spacing: -0.01em; }

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

.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;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 1000;
  background: var(--color-ink);
  color: var(--color-white);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-sm);
  transition: top 0.15s var(--ease);
}
.skip-link:focus { top: 1rem; }

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

/* ============================================================
   Layout helpers
   ============================================================ */
.container {
  width: 100%;
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: 24px;
}

.section {
  padding-block: clamp(64px, 9vw, 112px);
  scroll-margin-top: var(--header-h);
}
.section--soft { background: var(--color-bg-soft); }
.section--dark {
  background: var(--color-ink);
  color: var(--color-text-invert);
}
#hero { scroll-margin-top: 0; }
#kontakt { scroll-margin-top: var(--header-h); }
#zastosowania { border-top: 1px solid var(--color-border); }

.section__head { max-width: 640px; margin-bottom: clamp(36px, 5vw, 56px); }
.section__head--invert h2 { color: var(--color-text-invert); }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent-text);
  margin-bottom: 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
}
.eyebrow::before {
  content: "";
  width: 18px;
  height: 1.5px;
  background: var(--color-accent);
  display: inline-block;
}
.eyebrow--invert { color: var(--color-accent); }

h2 { font-size: clamp(1.7rem, 2.6vw, 2.35rem); color: var(--color-text); }
h3 { font-size: 1.08rem; color: var(--color-text); }

.icon {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  color: var(--color-accent);
}

/* ============================================================
   Buttons
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55em;
  min-height: 44px;
  padding: 0.85em 1.5em;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  transition: background-color 0.18s var(--ease), border-color 0.18s var(--ease), color 0.18s var(--ease), transform 0.18s var(--ease);
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }
.btn .icon { width: 18px; height: 18px; color: currentColor; }

.btn--accent {
  background: var(--color-accent);
  color: var(--color-on-accent);
}
.btn--accent:hover { background: var(--color-accent-dark); }

.btn--outline-invert {
  background: transparent;
  color: var(--color-white);
  border-color: rgba(255, 255, 255, 0.5);
}
.btn--outline-invert:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn--sm { padding: 0.6em 1.15em; font-size: 0.875rem; }
.btn--lg { padding: 1em 2em; font-size: 1rem; }

/* ============================================================
   Header
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  background: var(--color-ink);
  border-bottom: 1px solid var(--color-graphite-700);
  transition: box-shadow 0.2s var(--ease);
}
.site-header.is-scrolled {
  box-shadow: var(--shadow-sm);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
  color: var(--color-text-invert);
}
.logo__mark {
  width: 11px;
  height: 11px;
  background: var(--color-accent);
  transform: rotate(45deg);
  flex-shrink: 0;
}
.tm { font-size: 0.55em; font-weight: 600; vertical-align: super; margin-left: 1px; }

.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  margin-right: -10px;
  position: relative;
}
.nav-toggle__icon { position: absolute; }
.nav-toggle__icon--close { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__icon--open { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__icon--close { opacity: 1; }
.nav-toggle .icon { color: var(--color-text-invert); }

.site-nav__cta { display: none; }
.site-nav__cta.btn--accent { color: var(--color-white); }

@media (max-width: 959px) {
  .site-nav {
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: var(--color-ink);
    border-bottom: 1px solid var(--color-graphite-700);
    box-shadow: var(--shadow-md);
    padding: 20px 24px 24px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.18s var(--ease), transform 0.18s var(--ease), visibility 0.18s;
  }
  .site-nav.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }
  .site-nav ul { display: flex; flex-direction: column; gap: 4px; }
  .site-nav a {
    display: block;
    padding: 0.7rem 0;
    font-size: 1.02rem;
    font-weight: 500;
    color: var(--color-text-invert);
    border-bottom: 1px solid var(--color-graphite-700);
  }
  .site-nav a:hover { color: var(--color-accent); }
  .site-nav__cta {
    display: flex;
    width: 100%;
    justify-content: center;
    align-self: stretch;
    margin-top: 8px;
    padding: 0.9em 1.5em;
    font-size: 1rem;
  }
}

@media (min-width: 960px) {
  .nav-toggle { display: none; }
  .site-nav {
    display: flex;
    align-items: center;
    gap: 40px;
  }
  .site-nav ul { display: flex; align-items: center; gap: 32px; }
  .site-nav a {
    font-size: 0.92rem;
    font-weight: 500;
    color: var(--color-text-invert-muted);
    position: relative;
    padding-block: 4px;
    transition: color 0.15s var(--ease);
  }
  .site-nav a::after {
    content: "";
    position: absolute;
    left: 0; right: 100%;
    bottom: -2px;
    height: 1.5px;
    background: var(--color-accent);
    transition: right 0.2s var(--ease);
  }
  .site-nav a:hover { color: var(--color-text-invert); }
  .site-nav a:hover::after { right: 0; }
  .site-nav__cta { display: inline-flex; }
}

/* ============================================================
   Hero
   ============================================================ */
.hero {
  position: relative;
  width: 100%;
  background: var(--color-ink);
  overflow: hidden;
}

.hero__frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: linear-gradient(180deg, #17181b 0%, #0b0c0e 100%);
}

.hero__video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.hero__fallback {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s var(--ease);
}
.hero__fallback.is-visible { opacity: 1; }

.hero__scrim {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(9, 10, 11, 0) 52%, rgba(9, 10, 11, 0.92) 100%);
  pointer-events: none;
}

.hero__content { position: relative; }
.hero__inner { max-width: 560px; padding-block: 40px 48px; }

.hero__title {
  color: var(--color-white);
  font-size: clamp(2rem, 5.2vw, 3.1rem);
  margin-bottom: 1.1rem;
}

.hero__lead {
  color: var(--color-text-invert-muted);
  font-size: 1.05rem;
  max-width: 46ch;
  margin-bottom: 2rem;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 2.5rem;
}

.hero__facts {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.hero__facts li {
  display: flex;
  align-items: center;
  gap: 0.65em;
  font-size: 0.9rem;
  color: var(--color-text-invert-muted);
}
.hero__facts .icon { width: 18px; height: 18px; }

@media (min-width: 901px) {
  .hero__frame {
    aspect-ratio: auto;
    height: min(84vh, 780px);
    min-height: 580px;
  }
  .hero__scrim {
    background: linear-gradient(90deg, rgba(9, 10, 11, 0.94) 0%, rgba(9, 10, 11, 0.68) 30%, rgba(9, 10, 11, 0.1) 58%, rgba(9, 10, 11, 0) 74%);
  }
  .hero__content {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
  }
  .hero__content .container { width: 100%; }
  .hero__inner { padding-block: 0; }
}

/* ============================================================
   Intro / Install section
   ============================================================ */
.install__grid {
  display: grid;
  gap: 48px;
}
.install__media img {
  width: 100%;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg-soft);
}
.install__lead {
  color: var(--color-text-muted);
  font-size: 1.02rem;
  margin: 1.1rem 0 2rem;
  max-width: 52ch;
}

.feature-list {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--color-border);
}
.feature-list li {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  padding: 0.95rem 0;
  border-bottom: 1px solid var(--color-border);
  font-weight: 500;
  font-size: 0.98rem;
}

@media (min-width: 860px) {
  .install__grid {
    grid-template-columns: 0.9fr 1.1fr;
    align-items: center;
    gap: 64px;
  }
}

/* ============================================================
   How it works
   ============================================================ */
.how {
  display: grid;
  gap: 48px;
}
.how__media img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.how__steps {
  display: grid;
  gap: 0;
}
.how__step {
  display: flex;
  gap: 1.5rem;
  padding-block: 1.75rem;
  border-top: 1px solid var(--color-border-strong);
}
.how__step:last-child { border-bottom: 1px solid var(--color-border-strong); }
.how__num {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-accent-text);
  padding-top: 0.15em;
  flex-shrink: 0;
}
.how__step-body h3 { margin-bottom: 0.4rem; }
.how__step-body p { color: var(--color-text-muted); max-width: 48ch; }

@media (min-width: 860px) {
  .how {
    grid-template-columns: 0.85fr 1.15fr;
    gap: 64px;
    align-items: start;
  }
}

/* ============================================================
   Features (Możliwości)
   ============================================================ */
.features {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}
.features__item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.85rem;
  padding: 26px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-white);
}
.features__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  flex-shrink: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg-soft);
}
.features__icon .icon { width: 22px; height: 22px; }
.features__item h3 { font-size: 1.02rem; }
.features__item p { color: var(--color-text-muted); font-size: 0.94rem; }

@media (min-width: 640px) {
  .features { grid-template-columns: 1fr 1fr; }
}

@media (min-width: 980px) {
  .features { grid-template-columns: 1fr 1fr 1fr; }
}

/* ============================================================
   Zastosowania
   ============================================================ */
.uses__grid { display: grid; gap: 32px; }
.uses__media img {
  width: 100%;
  border-radius: var(--radius-md);
}
.uses__text > p { color: var(--color-text-muted); max-width: 54ch; margin: 1rem 0 1.75rem; }

.uses__list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px 20px;
}
.uses__list li {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  font-weight: 500;
  font-size: 0.96rem;
  color: var(--color-text);
}
.uses__list .icon { width: 20px; height: 20px; color: var(--color-accent-text); flex-shrink: 0; }

@media (min-width: 480px) {
  .uses__list { grid-template-columns: 1fr 1fr; }
}

@media (min-width: 860px) {
  .uses__grid { grid-template-columns: 1.15fr 0.85fr; gap: 56px; align-items: center; }
}

/* ============================================================
   Platform flow
   ============================================================ */
.platform__lead {
  color: var(--color-text-invert-muted);
  font-size: 1.02rem;
  max-width: 56ch;
  margin-top: 0.75rem;
}

.platform-flow {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  margin-top: 12px;
}
.platform-flow__stage {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  text-align: center;
  max-width: 340px;
  padding: 8px 4px;
}
.platform-flow__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 68px;
  height: 68px;
  flex-shrink: 0;
  border: 1px solid var(--color-graphite-700);
  border-radius: var(--radius-md);
  background: var(--color-graphite-900);
}
.platform-flow__icon .icon { color: var(--color-accent); }
.platform-flow__stage h3 { color: var(--color-white); font-size: 1.05rem; }
.platform-flow__stage p {
  color: var(--color-text-invert-muted);
  font-size: 0.9rem;
  max-width: 30ch;
}

.platform-flow__connector {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 6px 0;
}
.platform-flow__line {
  width: 1px;
  height: 26px;
  background: var(--color-graphite-700);
}
.platform-flow__connector .icon {
  width: 18px;
  height: 18px;
  color: var(--color-accent);
  transform: rotate(90deg);
}

@media (min-width: 760px) {
  .platform-flow { flex-direction: row; align-items: flex-start; justify-content: center; gap: 8px; }
  .platform-flow__stage { flex: 1 1 260px; }
  .platform-flow__connector {
    flex-direction: row;
    align-self: flex-start;
    margin-top: 34px;
    padding: 0 6px;
  }
  .platform-flow__line { width: 48px; height: 1px; }
  .platform-flow__connector .icon { transform: none; }
}

/* ============================================================
   Specyfikacja
   ============================================================ */
.spec {
  border-top: 1px solid var(--color-border);
}
.spec__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 1rem 14px;
  border-bottom: 1px solid var(--color-border);
}
.spec__row dt {
  font-size: 0.82rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
}
.spec__row dd {
  font-size: 1rem;
  font-weight: 500;
  overflow-wrap: break-word;
  word-break: break-word;
}
.spec__row:nth-child(even) { background: var(--color-bg-soft); }

@media (min-width: 640px) {
  .spec__row {
    grid-template-columns: minmax(150px, 240px) 1fr;
    align-items: baseline;
    column-gap: 32px;
    padding: 1.1rem 1.25rem;
  }
  .spec__row dt { text-align: left; }
  .spec__row dd { text-align: right; }
}

/* ============================================================
   Contact
   ============================================================ */
.section--contact { background: var(--color-white); border-top: 1px solid var(--color-border); }

.contact__grid {
  display: grid;
  gap: 40px;
}
.contact__intro { max-width: 480px; }
.contact__lead {
  color: var(--color-text-muted);
  font-size: 1.02rem;
  margin: 1rem 0 1.75rem;
}
.contact__mail {
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
  font-weight: 600;
  color: var(--color-text);
  border-bottom: 1px solid var(--color-border-strong);
  padding-bottom: 2px;
  transition: color 0.15s var(--ease), border-color 0.15s var(--ease);
}
.contact__mail .icon { width: 18px; height: 18px; color: var(--color-accent-text); }
.contact__mail:hover { color: var(--color-accent-text); border-color: var(--color-accent-text); }

.contact-form {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding: clamp(24px, 3vw, 32px);
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}
.contact-form__row { display: flex; flex-direction: column; gap: 8px; }
.contact-form__row label {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-text);
}
.contact-form__optional { font-weight: 400; color: var(--color-text-muted); }

.contact-form__row input,
.contact-form__row textarea {
  width: 100%;
  font: inherit;
  font-size: 0.96rem;
  color: var(--color-text);
  background: var(--color-white);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  padding: 0.75em 0.9em;
  transition: border-color 0.15s var(--ease), box-shadow 0.15s var(--ease);
}
.contact-form__row textarea { resize: vertical; min-height: 120px; }
.contact-form__row input:focus-visible,
.contact-form__row textarea:focus-visible {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(254, 101, 7, 0.15);
}
.contact-form__row input:invalid[data-touched="true"],
.contact-form__row textarea:invalid[data-touched="true"] {
  border-color: var(--color-error-text);
}

.contact-form__hp {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}

.contact-form__consent {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  font-size: 0.88rem;
  color: var(--color-text-muted);
  cursor: pointer;
}
.contact-form__consent input {
  margin-top: 0.2em;
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  accent-color: var(--color-accent);
}

.contact-form__submit {
  width: 100%;
  min-height: 48px;
}
.contact-form__submit[disabled] {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.contact-form__status {
  min-height: 1.4em;
  font-size: 0.9rem;
  font-weight: 500;
}
.contact-form__status[data-state="sending"] { color: var(--color-text-muted); }
.contact-form__status[data-state="success"] { color: var(--color-success-text); }
.contact-form__status[data-state="error"] { color: var(--color-error-text); }

@media (min-width: 860px) {
  .contact__grid { grid-template-columns: 0.9fr 1.1fr; gap: 64px; align-items: start; }
}

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
  background: var(--color-bg-soft);
  border-top: 1px solid var(--color-border);
  padding-block: 40px 28px;
}
.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 20px;
}
.logo--footer { color: var(--color-text); }
.site-footer__nav { display: flex; flex-wrap: wrap; gap: 20px; }
.site-footer__nav a, .site-footer__mail {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  transition: color 0.15s var(--ease);
  overflow-wrap: anywhere;
}
.site-footer__nav a:hover, .site-footer__mail:hover { color: var(--color-accent-text); }
.site-footer__copy { font-size: 0.82rem; color: var(--color-text-muted); }

/* ============================================================
   Reveal-on-scroll
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}