/* ==========================================================================
   Kubernetes po polsku — one-page
   Custom, framework-free stylesheet
   ========================================================================== */

:root {
  /* Palette */
  --color-bg: #0b1220;
  --color-bg-soft: #121b30;
  --color-bg-alt: #ffffff;
  --color-surface: #f5f7fb;
  --color-surface-dark: #111a2e;
  --color-border: #e2e8f0;
  --color-border-dark: #24304a;
  --color-text: #131b2e;
  --color-text-muted: #5b6478;
  --color-text-inverse: #f5f7fb;
  --color-text-inverse-muted: #aab4cc;
  --color-accent: #2f7de1;
  --color-accent-dark: #1e5fc2;
  --color-accent-soft: #e8f0fe;
  --color-success: #1fa97f;
  --color-success-soft: #e4f8f1;
  --color-urgent: #ff5a4d;
  --color-urgent-dark: #c81e3a;
  --color-urgent-soft: #ffe9e6;

  /* Type */
  --font-heading: "Space Grotesk", "Segoe UI", sans-serif;
  --font-body: "Inter", "Segoe UI", sans-serif;

  /* Layout */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --container-max: 1200px;
  --header-h: 72px;
  --shadow-card: 0 1px 2px rgba(19, 27, 46, 0.06), 0 8px 24px rgba(19, 27, 46, 0.06);
  --shadow-card-hover: 0 4px 10px rgba(19, 27, 46, 0.08), 0 16px 32px rgba(19, 27, 46, 0.1);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg-alt);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul { margin: 0; padding: 0; list-style: none; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }
h1, h2, h3, h4 { font-family: var(--font-heading); line-height: 1.15; margin: 0; font-weight: 600; }
p { margin: 0; }

.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 32px);
}

.visually-hidden {
  position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

section { padding-block: clamp(48px, 8vw, 96px); }
section.section-dark { background: var(--color-bg); color: var(--color-text-inverse); }
section.section-alt { background: var(--color-surface); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 12px;
}
section.section-dark .eyebrow { color: #7fb0ff; }

.section-head {
  max-width: 700px;
  margin-bottom: clamp(28px, 5vw, 48px);
}
.section-head.center { margin-inline: auto; text-align: center; }
.section-head h2 { font-size: clamp(1.6rem, 3.2vw, 2.4rem); margin-bottom: 14px; }
.section-head p { color: var(--color-text-muted); font-size: 1.05rem; }
section.section-dark .section-head p { color: var(--color-text-inverse-muted); }
.urgency-inline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 14px;
  padding: 8px 16px;
  border-radius: 999px;
  background: var(--color-urgent-soft);
  color: var(--color-urgent-dark);
  font-size: 0.85rem;
  font-weight: 600;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 24px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  min-height: 44px;
  transition: transform .15s ease, box-shadow .15s ease, background-color .15s ease, border-color .15s ease;
  white-space: nowrap;
}
.btn-primary {
  background: var(--color-accent);
  color: #fff;
  box-shadow: 0 8px 20px rgba(47, 125, 225, 0.35);
}
.btn-primary:hover { background: var(--color-accent-dark); transform: translateY(-1px); }
.btn-secondary {
  background: transparent;
  color: var(--color-text-inverse);
  border: 1.5px solid rgba(245, 247, 251, 0.35);
}
.btn-secondary:hover { border-color: rgba(245, 247, 251, 0.7); }
.btn-ghost {
  background: var(--color-accent-soft);
  color: var(--color-accent-dark);
}
.btn-ghost:hover { background: #d9e8fd; }
.btn-block { width: 100%; }
.btn-sm { padding: 9px 16px; min-height: 36px; font-size: 0.875rem; }

/* ==========================================================================
   Urgency bar + Header
   ========================================================================== */
.top-stack {
  position: sticky;
  top: 0;
  z-index: 100;
  transition: box-shadow .2s ease;
}
.top-stack.is-scrolled {
  box-shadow: 0 4px 20px rgba(0,0,0,0.25);
}

.urgency-bar {
  background: linear-gradient(90deg, var(--color-urgent-dark), var(--color-urgent));
  color: #fff;
}
.urgency-bar-inner {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px 20px;
  padding-block: 9px;
  text-align: center;
}
.urgency-bar-text { font-size: 0.85rem; }
.urgency-bar-text strong { font-weight: 700; }
.urgency-bar-cta {
  flex: none;
  font-size: 0.8rem;
  font-weight: 700;
  background: rgba(255,255,255,0.18);
  padding: 5px 14px;
  border-radius: 999px;
  white-space: nowrap;
  transition: background-color .15s ease;
}
.urgency-bar-cta:hover { background: rgba(255,255,255,0.3); }

.site-header {
  background: var(--color-bg);
  border-bottom: 1px solid transparent;
  transition: border-color .2s ease;
}
.top-stack.is-scrolled .site-header {
  border-bottom-color: var(--color-border-dark);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
  gap: 16px;
}
.brand { display: flex; align-items: center; }
.brand img { height: 32px; width: auto; }

.main-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}
.main-nav a {
  color: var(--color-text-inverse-muted);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color .15s ease;
}
.main-nav a:hover { color: var(--color-text-inverse); }
.main-nav .btn { display: none; }

.header-actions { display: flex; align-items: center; gap: 16px; }

.hamburger {
  display: none;
  width: 44px; height: 44px;
  align-items: center; justify-content: center;
  flex-direction: column;
  gap: 5px;
}
.hamburger span {
  display: block; width: 22px; height: 2px;
  background: var(--color-text-inverse);
  border-radius: 2px;
  transition: transform .2s ease, opacity .2s ease;
}
.hamburger[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.hamburger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 959px) {
  .main-nav {
    position: fixed;
    inset: var(--stack-h, var(--header-h)) 0 0 0;
    background: var(--color-bg);
    flex-direction: column;
    align-items: stretch;
    padding: 24px clamp(16px, 4vw, 32px) 32px;
    gap: 4px;
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity .2s ease, transform .2s ease, visibility .2s;
    overflow-y: auto;
  }
  .main-nav.is-open {
    opacity: 1; transform: translateY(0); visibility: visible; pointer-events: auto;
  }
  .main-nav a {
    padding: 14px 4px;
    border-bottom: 1px solid var(--color-border-dark);
    font-size: 1.05rem;
  }
  .main-nav .btn { display: inline-flex; margin-top: 16px; }
  .header-actions .btn-primary.desktop-only { display: none; }
  .hamburger { display: inline-flex; }
}

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
  background:
    radial-gradient(circle at 85% 0%, rgba(47,125,225,0.35), transparent 55%),
    radial-gradient(circle at 0% 100%, rgba(31,169,127,0.18), transparent 45%),
    var(--color-bg);
  color: var(--color-text-inverse);
  padding-block: clamp(56px, 10vw, 120px);
}
.hero-banner {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(47, 125, 225, 0.15);
  border: 1px solid rgba(47, 125, 225, 0.4);
  color: #bcd6ff;
  padding: 8px 16px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 24px;
}
.hero-banner-urgent {
  background: rgba(255, 90, 77, 0.15);
  border-color: rgba(255, 90, 77, 0.45);
  color: #ffc4bd;
  font-weight: 600;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: clamp(32px, 6vw, 64px);
  align-items: center;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-success);
  background: rgba(31, 169, 127, 0.12);
  border-radius: 999px;
  padding: 6px 14px;
  margin-bottom: 20px;
}
.hero h1 {
  font-size: clamp(2.1rem, 5vw, 3.4rem);
  margin-bottom: 20px;
}
.hero-lead {
  font-size: 1.15rem;
  color: var(--color-text-inverse-muted);
  max-width: 560px;
  margin-bottom: 32px;
}
.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 36px; }
.hero-stats { display: flex; flex-wrap: wrap; gap: clamp(20px, 4vw, 40px); }
.hero-stats div strong {
  display: block;
  font-family: var(--font-heading);
  font-size: 1.6rem;
  color: #fff;
}
.hero-stats div span { font-size: 0.85rem; color: var(--color-text-inverse-muted); }

.hero-visual {
  position: relative;
  max-width: 380px;
  margin-inline: auto;
  filter: drop-shadow(0 30px 60px rgba(0,0,0,0.45));
}
.hero-visual img {
  animation: float 6s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-14px); }
}
@media (prefers-reduced-motion: reduce) { .hero-visual img { animation: none; } }

@media (max-width: 959px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-visual { order: -1; max-width: 240px; }
}

/* ==========================================================================
   Generic content sections
   ========================================================================== */
.why-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.why-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 28px;
}
.why-card .icon-badge { margin-bottom: 16px; }
.why-card h3 { font-size: 1.2rem; margin-bottom: 10px; }
.why-card p { color: var(--color-text-muted); }
@media (max-width: 719px) { .why-grid { grid-template-columns: 1fr; } }

.audience-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
@media (max-width: 959px) { .audience-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 639px) { .audience-grid { grid-template-columns: 1fr; } }

.icon-badge {
  width: 48px; height: 48px;
  border-radius: 12px;
  background: var(--color-accent-soft);
  display: flex; align-items: center; justify-content: center;
  color: var(--color-accent-dark);
}
.icon-badge svg { width: 24px; height: 24px; }
section.section-dark .icon-badge { background: rgba(47,125,225,0.18); color: #7fb0ff; }

/* ---------- Pricing ---------- */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
  align-items: start;
}
.price-card {
  position: relative;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  box-shadow: var(--shadow-card);
  transition: box-shadow .2s ease, transform .2s ease;
}
.price-card:hover { box-shadow: var(--shadow-card-hover); transform: translateY(-2px); }
.price-box { width: 100%; height: auto; border-radius: var(--radius-sm); }
.price-card.is-featured {
  border-color: var(--color-accent);
  background: linear-gradient(180deg, var(--color-accent-soft), #fff 30%);
  position: relative;
}
.price-badge {
  position: absolute;
  top: -13px; left: 24px;
  background: var(--color-accent);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 5px 12px;
  border-radius: 999px;
}
.price-badge-urgent {
  background: var(--color-urgent-dark);
}
.price-badge-muted {
  background: var(--color-surface);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}
.price-card h3 { font-size: 1.25rem; }
.price-card .price-desc { color: var(--color-text-muted); font-size: 0.92rem; min-height: 66px; }
.price-note-inline { font-size: 0.8rem; color: var(--color-text-muted); font-style: italic; margin-top: -8px; }
.price-facts { display: flex; flex-direction: column; gap: 8px; font-size: 0.9rem; }
.price-facts li { display: flex; gap: 8px; align-items: flex-start; }
.price-facts svg { flex: none; width: 16px; height: 16px; margin-top: 3px; color: var(--color-success); }

/* ---------- What's new ---------- */
.whatsnew-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-bottom: 32px;
}
.whatsnew-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 26px;
}
.whatsnew-card h3 { font-size: 1.15rem; margin: 14px 0 10px; }
.whatsnew-card p { color: var(--color-text-muted); font-size: 0.94rem; }
.cert-logos { display: flex; gap: 16px; margin-top: 18px; flex-wrap: wrap; }
.cert-logos img { width: 64px; height: 64px; }
.highlight-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.highlight-row p { color: var(--color-text-muted); }
.highlight-row strong { color: var(--color-text); }
@media (max-width: 719px) {
  .whatsnew-grid, .highlight-row { grid-template-columns: 1fr; }
}

/* ---------- Curriculum ---------- */
.curriculum-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}
.curriculum-col h3 {
  font-size: 1.2rem;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.curriculum-col h3 .tag {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--color-accent-soft);
  color: var(--color-accent-dark);
}
.curriculum-col.pro h3 .tag { background: var(--color-success-soft); color: #157a5c; }
@media (max-width: 819px) { .curriculum-grid { grid-template-columns: 1fr; } }

/* ---------- Accordion (shared: curriculum modules, pricing details, FAQ) ---------- */
.accordion-item {
  border-bottom: 1px solid var(--color-border);
}
.accordion-item:first-child { border-top: 1px solid var(--color-border); }
.accordion-trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 4px;
  text-align: left;
  font-weight: 600;
  font-size: 0.98rem;
}
.accordion-trigger .num {
  color: var(--color-accent);
  font-family: var(--font-heading);
  margin-right: 10px;
}
.accordion-trigger .chevron {
  flex: none;
  width: 20px; height: 20px;
  transition: transform .2s ease;
  color: var(--color-text-muted);
}
.accordion-trigger[aria-expanded="true"] .chevron { transform: rotate(180deg); }
.accordion-panel {
  padding: 0 4px 18px;
  color: var(--color-text-muted);
  font-size: 0.92rem;
}
.accordion-panel[hidden] { display: none; }

/* Small "details" variant used inside pricing cards */
.price-card .accordion-trigger { padding: 4px; font-size: 0.85rem; color: var(--color-accent-dark); font-weight: 600; }
.price-card .accordion-item { border: none; }
.price-card .accordion-item:first-child { border-top: none; }
.price-card .accordion-panel { padding: 4px 0 0; }

/* ---------- Demo lessons ---------- */
.demo-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.demo-card {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
}
.demo-video {
  aspect-ratio: 16/9;
  background: #0b1220;
  position: relative;
}
.demo-video iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}
.demo-video .demo-tag {
  position: absolute; top: 12px; left: 12px;
  z-index: 1;
  pointer-events: none;
  background: rgba(11,18,32,0.7);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 999px;
}
.demo-body { padding: 18px 20px 22px; }
.demo-body .demo-module { font-size: 0.78rem; color: var(--color-accent-dark); font-weight: 600; margin-bottom: 6px; }
.demo-body h3 { font-size: 1rem; }
@media (max-width: 719px) { .demo-grid { grid-template-columns: 1fr; } }

/* ---------- Testimonials ---------- */
.testi-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.testi-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 26px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.testi-quote { color: var(--color-text-muted); font-size: 0.95rem; flex: 1; }
.testi-person { display: flex; align-items: center; gap: 12px; }
.testi-avatar {
  width: 48px; height: 48px;
  border-radius: 50%;
  object-fit: cover;
  flex: none;
}
.testi-avatar-initials {
  width: 48px; height: 48px;
  border-radius: 50%;
  background: var(--color-accent-soft);
  color: var(--color-accent-dark);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-heading);
  font-weight: 700;
  flex: none;
}
.testi-person strong { display: block; font-size: 0.92rem; }
.testi-person span { display: block; font-size: 0.8rem; color: var(--color-text-muted); }
@media (max-width: 719px) { .testi-grid { grid-template-columns: 1fr; } }

/* ---------- Author ---------- */
.author-grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: clamp(32px, 5vw, 56px);
  align-items: center;
}
.author-photo {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-surface);
  max-width: 380px;
  margin-inline: auto;
}
.author-copy p { margin-bottom: 16px; color: var(--color-text-muted); }
.author-copy p:last-child { margin-bottom: 0; }
.author-copy p a { color: var(--color-accent-dark); font-weight: 600; text-decoration: underline; text-underline-offset: 2px; }
.certified-box {
  margin-top: 28px;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 24px;
  border-left: 4px solid var(--color-success);
}
.certified-box h3 { font-size: 1.05rem; margin-bottom: 8px; }
.certified-box p { color: var(--color-text-muted); margin: 0; }
@media (max-width: 819px) { .author-grid { grid-template-columns: 1fr; } }

/* ---------- FAQ ---------- */
.faq-wrap { max-width: 780px; margin-inline: auto; }

/* ---------- Final urgency CTA ---------- */
.final-cta {
  background: linear-gradient(135deg, var(--color-urgent-dark), var(--color-urgent));
  color: #fff;
}
.final-cta-inner {
  text-align: center;
  max-width: 640px;
}
.final-cta .eyebrow { color: #ffe3df; }
.final-cta h2 { color: #fff; font-size: clamp(1.5rem, 3vw, 2.1rem); margin-bottom: 14px; }
.final-cta p { color: #ffe3df; margin-bottom: 28px; }
.final-cta .btn-primary { background: #fff; color: var(--color-urgent-dark); box-shadow: 0 10px 30px rgba(0,0,0,0.2); }
.final-cta .btn-primary:hover { background: #fff0ee; }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--color-bg);
  color: var(--color-text-inverse-muted);
  padding-block: 48px 28px;
}
.footer-top {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 32px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--color-border-dark);
  margin-bottom: 24px;
}
.footer-brand img { height: 28px; margin-bottom: 14px; }
.footer-brand p { font-size: 0.9rem; max-width: 280px; }
.footer-col h4 { font-family: var(--font-body); font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.05em; color: #fff; margin-bottom: 14px; }
.footer-col a { display: block; padding: 6px 0; font-size: 0.92rem; }
.footer-col a:hover { color: #fff; }
.social-row { display: flex; gap: 12px; margin-top: 6px; }
.social-row a {
  width: 38px; height: 38px;
  border-radius: 50%;
  background: rgba(245,247,251,0.08);
  display: flex; align-items: center; justify-content: center;
}
.social-row a:hover { background: rgba(245,247,251,0.16); }
.social-row svg { width: 18px; height: 18px; }
.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: space-between;
  font-size: 0.82rem;
}
.footer-bottom a { text-decoration: underline; text-underline-offset: 2px; }
.footer-bottom a:hover { color: #fff; }
@media (max-width: 819px) {
  .footer-top { grid-template-columns: 1fr; }
}

/* ---------- Misc ---------- */
.text-center { text-align: center; }
.mt-32 { margin-top: 32px; }