/* ============================================================
   SITE HEADER — kotler.pl
   Turbo Pro: scroll progress · mega dropdown · magnetic hover
   · full-screen mobile overlay · stagger reveal
   ============================================================ */

/* ---- Scroll progress bar ---- */

.kotler-header__progress {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  z-index: 1;
  overflow: hidden;
  pointer-events: none;
}

.kotler-header__progress-bar {
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, var(--kotler-blue) 0%, rgba(0, 128, 246, 0.35) 100%);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 80ms linear;
}

/* ---- Theme variables (light = default, dark = body.has-dark-hero) ---- */

.kotler-header {
  --header-text:           var(--kotler-ink);
  --header-text-mute:      var(--kotler-text-mute, #707070);
  --header-cta-bg:         var(--kotler-ink);
  --header-cta-text:       #ffffff;
  --header-cta-hover-bg:   var(--kotler-blue);
  --header-cta-hover-text: #ffffff;
  --header-border:         var(--kotler-border, rgba(10, 22, 40, 0.08));
  --header-scrolled-bg:    rgba(250, 250, 247, 0.85);
  --header-hamburger:      var(--kotler-ink);
}

body.has-dark-hero .kotler-header {
  --header-text:           var(--kotler-bg, #fafaf7);
  --header-text-mute:      rgba(250, 250, 247, 0.6);
  --header-cta-bg:         var(--kotler-bg, #fafaf7);
  --header-cta-text:       var(--kotler-ink);
  --header-cta-hover-bg:   var(--kotler-blue);
  --header-cta-hover-text: #ffffff;
  --header-border:         rgba(250, 250, 247, 0.12);
  --header-scrolled-bg:    rgba(10, 22, 40, 0.85);
  --header-hamburger:      var(--kotler-bg, #fafaf7);
}

/* ---- Base header ---- */

.kotler-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition:
    background 320ms ease,
    border-color 320ms ease,
    box-shadow 320ms ease;
}

.kotler-header.is-scrolled {
  background: var(--header-scrolled-bg);
  backdrop-filter: blur(12px) saturate(140%);
  -webkit-backdrop-filter: blur(12px) saturate(140%);
  border-bottom-color: var(--header-border);
}

/* ---- Inner container ---- */

.kotler-header__inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 2vw, 2.5rem);
  height: 64px;
  display: flex;
  align-items: center;
  position: relative;
  transition: height 320ms cubic-bezier(0.16, 1, 0.3, 1);
}

@media (min-width: 980px) {
  .kotler-header__inner {
    height: 88px;
  }

  .kotler-header.is-scrolled .kotler-header__inner {
    height: 64px;
  }
}

/* ---- Logo ---- */

.kotler-header__logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.4rem;
  letter-spacing: -0.04em;
  color: var(--header-text) !important;
  text-decoration: none !important;
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: transform 240ms ease, color 320ms ease;
  position: relative;
  z-index: 1;
}

.kotler-header__logo:link,
.kotler-header__logo:visited,
.kotler-header__logo:hover,
.kotler-header__logo:focus {
  color: var(--header-text) !important;
  text-decoration: none !important;
}

.kotler-header__logo:hover {
  transform: scale(1.03);
}

.kotler-header__logo-img {
  display: block;
  width: 160px;
  height: 44px;
  object-fit: contain;
}

.kotler-header.is-scrolled .kotler-header__logo-img {
  width: 130px;
  height: 36px;
  transition: width 240ms ease, height 240ms ease;
}

/* ---- Desktop nav (centered) ---- */

.kotler-header__nav {
  display: none;
  flex: 1;
  justify-content: center;
}

@media (min-width: 980px) {
  .kotler-header__nav {
    display: flex;
  }
}

.kotler-header__nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  gap: 2.25rem;
}

.kotler-header__nav-item {
  margin: 0;
  padding: 0;
  position: relative;
}

/* Nav links and button triggers share these styles */

.kotler-header__nav-link {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 0.94rem;
  letter-spacing: -0.01em;
  color: var(--header-text);
  text-decoration: none;
  padding: 0.5rem 0;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  position: relative;
  background: none;
  border: none;
  cursor: pointer;
  white-space: nowrap;
  transition: color 320ms ease;
}

.kotler-header__nav-link:link,
.kotler-header__nav-link:visited {
  color: var(--header-text);
  text-decoration: none;
}

.kotler-header__nav-link:hover,
.kotler-header__nav-trigger[aria-expanded="true"] {
  color: var(--kotler-blue);
}

/* Animated underline scaleX left→right */

.kotler-header__nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--kotler-blue);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 320ms cubic-bezier(0.65, 0, 0.35, 1);
}

.kotler-header__nav-link:hover::after,
.kotler-header__nav-trigger[aria-expanded="true"]::after {
  transform: scaleX(1);
}

/* Dropdown chevron arrow */

.kotler-header__nav-arrow {
  transition: transform 280ms ease;
  flex-shrink: 0;
}

.kotler-header__nav-trigger[aria-expanded="true"] .kotler-header__nav-arrow {
  transform: rotate(180deg);
}

/* ---- Actions: CTA + hamburger ---- */

.kotler-header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
  margin-left: auto;
}

@media (min-width: 980px) {
  .kotler-header__actions {
    margin-left: 0;
  }
}

/* CTA pill button */

.kotler-header__cta {
  display: none;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--header-cta-text) !important;
  background: var(--header-cta-bg);
  text-decoration: none !important;
  border-radius: 999px;
  padding: 0.78rem 1.5rem;
  align-items: center;
  gap: 0.5rem;
  white-space: nowrap;
  transition:
    background 240ms cubic-bezier(0.16, 1, 0.3, 1),
    color      320ms ease,
    box-shadow 240ms cubic-bezier(0.16, 1, 0.3, 1),
    transform  240ms cubic-bezier(0.16, 1, 0.3, 1);
}

.kotler-header__cta:link,
.kotler-header__cta:visited {
  color: var(--header-cta-text) !important;
  text-decoration: none !important;
}

@media (min-width: 980px) {
  .kotler-header__cta {
    display: inline-flex;
  }
}

.kotler-header__cta:hover,
.kotler-header__cta:focus-visible {
  background: var(--header-cta-hover-bg);
  box-shadow: 0 12px 32px rgba(0, 128, 246, 0.32);
  transform: translateY(-2px);
  color: var(--header-cta-hover-text) !important;
}

.kotler-header__cta:hover .kotler-header__cta-arrow {
  transform: translateX(4px);
}

.kotler-header__cta-arrow {
  transition: transform 240ms cubic-bezier(0.16, 1, 0.3, 1);
  flex-shrink: 0;
}

/* ---- Hamburger (2-line) ---- */

.kotler-hamburger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 7px;
  width: 28px;
  height: 28px;
  padding: 0;
  background: none;
  border: none;
  cursor: pointer;
  flex-shrink: 0;
  -webkit-tap-highlight-color: transparent;
}

.kotler-hamburger:focus-visible {
  outline: 2px solid var(--kotler-blue);
  outline-offset: 4px;
  border-radius: 4px;
}

@media (min-width: 980px) {
  .kotler-hamburger {
    display: none;
  }
}

.kotler-hamburger__line {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--header-hamburger);
  border-radius: 1px;
  transform-origin: center;
  transition:
    transform   320ms cubic-bezier(0.65, 0, 0.35, 1),
    background  320ms ease;
}

.kotler-hamburger.is-open .kotler-hamburger__line:nth-child(1) {
  transform: translateY(4.5px) rotate(45deg);
}

.kotler-hamburger.is-open .kotler-hamburger__line:nth-child(2) {
  transform: translateY(-4.5px) rotate(-45deg);
}

/* ============================================================
   MEGA DROPDOWN
   ============================================================ */

/* Invisible hover bridge — prevents close when moving cursor
   from trigger down to dropdown (12px gap) */
.kotler-header__nav-item--has-dropdown::before {
  content: '';
  position: absolute;
  bottom: -12px;
  left: -24px;
  right: -24px;
  height: 16px;
  z-index: 199;
}

.kotler-header__dropdown {
  position: absolute;
  top: calc(100% + 12px);
  left: 50%;
  transform: translateX(-50%) translateY(-8px);
  width: 720px;
  z-index: 200;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition:
    opacity    280ms ease,
    transform  360ms cubic-bezier(0.16, 1, 0.3, 1),
    visibility 0s   linear 280ms;
}

.kotler-header__dropdown.is-open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
  transition:
    opacity    280ms ease,
    transform  360ms cubic-bezier(0.16, 1, 0.3, 1),
    visibility 0s   linear 0s;
}

.kotler-header__dropdown-inner {
  background: var(--kotler-paper);
  border: 1px solid var(--kotler-border);
  border-radius: 1.25rem;
  box-shadow:
    0 24px 60px rgba(10, 22, 40, 0.12),
    0 8px  20px rgba(10, 22, 40, 0.06);
  padding: 1.75rem;
  display: grid;
  grid-template-columns: 40% 60%;
  gap: 1.5rem;
}

/* Left intro column */

.kotler-header__dropdown-eyebrow {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--kotler-text-mute);
  text-transform: uppercase;
  margin: 0 0 0.75rem;
}

.kotler-header__dropdown-heading {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  line-height: 1.25;
  letter-spacing: -0.03em;
  color: var(--kotler-ink);
  margin: 0 0 0.75rem;
}

.kotler-header__dropdown-desc {
  font-size: 0.88rem;
  line-height: 1.55;
  color: var(--kotler-text-mute);
  margin: 0 0 1.25rem;
}

.kotler-header__dropdown-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.88rem;
  color: var(--kotler-blue) !important;
  text-decoration: none !important;
  transition: gap 200ms ease;
}

.kotler-header__dropdown-link:hover {
  gap: 0.65rem;
}

/* Right list column */

.kotler-header__dropdown-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.kotler-header__dropdown-list li {
  margin: 0;
  padding: 0;
}

.kotler-header__dropdown-item {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.75rem;
  border-radius: 0.75rem;
  text-decoration: none !important;
  color: inherit;
  transition:
    background 240ms ease,
    transform  240ms ease;
}

.kotler-header__dropdown-item:link,
.kotler-header__dropdown-item:visited {
  color: inherit;
  text-decoration: none !important;
}

.kotler-header__dropdown-item:hover {
  background: var(--kotler-blue-50);
  transform: translateX(4px);
}

/* Icon box */

.kotler-header__item-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  flex-shrink: 0;
  background: var(--kotler-blue-50);
  border-radius: 0.5rem;
  color: var(--kotler-blue);
  transition:
    background 240ms ease,
    color      240ms ease;
}

.kotler-header__dropdown-item:hover .kotler-header__item-icon {
  background: var(--kotler-blue);
  color: #ffffff;
}

/* SlotWise / rezerwacje - zielony akcent (hardcoded, zmienne --slotwise-green* są scoped na landingu) */
.kotler-header__item-icon--slotwise {
  background: #e8f2ef;
  color: #1d5f4e;
}

.kotler-header__dropdown-item:hover .kotler-header__item-icon--slotwise {
  background: #1d5f4e;
  color: #ffffff;
}

.kotler-header__item-text {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.kotler-header__item-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  line-height: 1.3;
  color: var(--kotler-ink);
}

.kotler-header__item-desc {
  font-size: 0.8rem;
  line-height: 1.4;
  color: var(--kotler-text-mute);
}

/* ============================================================
   MOBILE FULL-SCREEN OVERLAY
   ============================================================ */

.kotler-mobile-overlay {
  position: fixed;
  inset: 0;
  z-index: 99;
  background: var(--kotler-bg);
  display: flex;
  flex-direction: column;
  padding: 80px clamp(1.5rem, 6vw, 3rem) 2rem;
  transform: translateX(100%);
  transition: transform 480ms cubic-bezier(0.16, 1, 0.3, 1);
  overflow-y: auto;
  pointer-events: none;
}

/* Decor: blue radial glow */
.kotler-mobile-overlay::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 80% 20%, rgba(0, 128, 246, 0.08) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
}

/* Decor: subtle grid */
.kotler-mobile-overlay::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(10, 22, 40, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(10, 22, 40, 0.025) 1px, transparent 1px);
  background-size: 32px 32px;
  opacity: 0.6;
  pointer-events: none;
  z-index: 0;
}

.kotler-mobile-overlay.is-open {
  transform: translateX(0);
  pointer-events: auto;
}

/* Nav and bottom sit above pseudo-element decorations */
.kotler-mobile-overlay__nav,
.kotler-mobile-overlay__bottom {
  position: relative;
  z-index: 1;
}

/* Nav list */

.kotler-mobile-overlay__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}

.kotler-mobile-overlay__item {
  margin: 0;
  padding: 0;
  border-bottom: 1px solid var(--kotler-border);
  /* Hidden by default; JS sets transition props inline for stagger */
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 200ms ease, transform 200ms ease;
}

/* Revealed state — JS stagger delays applied via inline style */
.kotler-mobile-overlay.is-open .kotler-mobile-overlay__item {
  opacity: 1;
  transform: none;
}

/* Big nav links */

.kotler-mobile-overlay__link {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 8vw, 3.25rem);
  letter-spacing: -0.04em;
  color: var(--kotler-ink);
  text-decoration: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 0;
  width: 100%;
  background: none;
  border: none;
  cursor: pointer;
  transition: color 320ms ease;
}

.kotler-mobile-overlay__link:link,
.kotler-mobile-overlay__link:visited {
  color: var(--kotler-ink);
  text-decoration: none;
}

.kotler-mobile-overlay__link:hover {
  color: var(--kotler-blue);
}

/* Accordion icon (+) */

.kotler-mobile-overlay__accordion-icon {
  font-size: 1.75rem;
  font-weight: 300;
  line-height: 1;
  color: var(--kotler-text-mute);
  flex-shrink: 0;
  transition: transform 320ms cubic-bezier(0.65, 0, 0.35, 1);
}

.kotler-mobile-overlay__accordion-trigger[aria-expanded="true"] .kotler-mobile-overlay__accordion-icon {
  transform: rotate(45deg);
  color: var(--kotler-blue);
}

/* Accordion submenu — grid-template-rows smooth height trick */

.kotler-mobile-overlay__submenu {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 400ms cubic-bezier(0.16, 1, 0.3, 1);
  overflow: hidden;
}

.kotler-mobile-overlay__submenu[aria-hidden="false"] {
  grid-template-rows: 1fr;
}

.kotler-mobile-overlay__submenu-inner {
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 0;
  padding-bottom: 1rem;
  padding-left: 1.5rem;
}

.kotler-mobile-overlay__sublink {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.25rem;
  color: var(--kotler-text-mute);
  text-decoration: none;
  padding: 0.4rem 0;
  display: block;
  transition: color 200ms ease;
}

.kotler-mobile-overlay__sublink:link,
.kotler-mobile-overlay__sublink:visited {
  color: var(--kotler-text-mute);
  text-decoration: none;
}

.kotler-mobile-overlay__sublink:hover {
  color: var(--kotler-blue);
}

/* Bottom section — fades in after items have staggered */

.kotler-mobile-overlay__bottom {
  margin-top: auto;
  padding-top: var(--space-8);
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  opacity: 0;
  transition: opacity 480ms ease 600ms;
}

.kotler-mobile-overlay.is-open .kotler-mobile-overlay__bottom {
  opacity: 1;
}

/* Mobile CTA pill */

.kotler-mobile-overlay__cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
  padding: 1rem 1.5rem;
  background: var(--kotler-ink);
  color: #ffffff !important;
  text-decoration: none !important;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1rem;
  border-radius: 999px;
  transition: background 240ms ease;
}

.kotler-mobile-overlay__cta:hover {
  background: var(--kotler-blue);
  color: #ffffff !important;
}

/* Contact info */

.kotler-mobile-overlay__contact {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.kotler-mobile-overlay__contact-item {
  font-size: 0.95rem;
  color: var(--kotler-text-mute);
  text-decoration: none;
  transition: color 200ms ease;
}

.kotler-mobile-overlay__contact-item:link,
.kotler-mobile-overlay__contact-item:visited {
  color: var(--kotler-text-mute);
  text-decoration: none;
}

.kotler-mobile-overlay__contact-item:hover {
  color: var(--kotler-blue);
}

.kotler-mobile-overlay__contact-item--plain {
  display: block;
  cursor: default;
}

.kotler-mobile-overlay__contact-item--plain:hover {
  color: var(--kotler-text-mute);
}

/* Social icons row */

.kotler-mobile-overlay__socials {
  display: flex;
  gap: 1rem;
}

.kotler-mobile-overlay__social {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--kotler-ink);
  text-decoration: none;
  transition: color 200ms ease;
}

.kotler-mobile-overlay__social:link,
.kotler-mobile-overlay__social:visited {
  color: var(--kotler-ink);
  text-decoration: none;
}

.kotler-mobile-overlay__social:hover {
  color: var(--kotler-blue);
}

/* Body scroll lock */

body.is-menu-open {
  overflow: hidden;
}

/* Hide overlay and hamburger on desktop */

@media (min-width: 980px) {
  .kotler-mobile-overlay {
    display: none !important;
  }
}

/* ============================================================
   SKIP LINK
   ============================================================ */

.skip-link:focus {
  background: var(--kotler-blue) !important;
  color: #ffffff !important;
  border-radius: 4px;
  top: var(--space-3) !important;
  left: var(--space-3) !important;
  padding: var(--space-3) var(--space-6) !important;
  font-family: var(--font-body);
  z-index: 999;
}

/* ============================================================
   ACCESSIBILITY — prefers-reduced-motion
   ============================================================ */

@media (prefers-reduced-motion: reduce) {
  .kotler-header,
  .kotler-header__inner,
  .kotler-header__logo,
  .kotler-header__nav-link,
  .kotler-header__cta,
  .kotler-header__nav-link::after,
  .kotler-header__nav-arrow,
  .kotler-header__dropdown,
  .kotler-hamburger__line,
  .kotler-mobile-overlay,
  .kotler-mobile-overlay__item,
  .kotler-mobile-overlay__bottom,
  .kotler-mobile-overlay__submenu {
    transition: none !important;
    animation: none !important;
  }

  /* Disable backdrop blur on scrolled state - reduced motion = reduced GPU effects */
  .kotler-header.is-scrolled {
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
  }

  .kotler-mobile-overlay {
    transform: none !important;
    opacity: 0;
    pointer-events: none;
  }

  .kotler-mobile-overlay.is-open {
    opacity: 1;
    pointer-events: auto;
  }

  .kotler-mobile-overlay__item {
    opacity: 1 !important;
    transform: none !important;
  }

  .kotler-mobile-overlay__bottom {
    opacity: 1 !important;
  }
}