/* ============================================================
   STUDNIARSTWO od A do Z – Design System & Styles
   ============================================================ */

/* ---------- CSS Custom Properties ---------- */
:root {
  /* Blues */
  --clr-navy:        hsl(218, 58%, 14%);
  --clr-navy-mid:    hsl(218, 50%, 22%);
  --clr-blue:        hsl(215, 70%, 42%);
  --clr-blue-accent: hsl(210, 85%, 52%);
  --clr-blue-light:  hsl(212, 80%, 62%);
  --clr-sky:         hsl(210, 80%, 94%);
  --clr-ice:         hsl(210, 60%, 97%);

  /* Neutrals */
  --clr-white:       #ffffff;
  --clr-gray-100:    #f4f6fa;
  --clr-gray-200:    #e2e6ee;
  --clr-gray-500:    #7a8399;
  --clr-gray-700:    #3d4660;
  --clr-gray-900:    #1a1e2e;

  /* Typography */
  --ff-primary: 'Inter', system-ui, -apple-system, sans-serif;
  --fs-base:    1rem;     /* 16px */
  --fs-sm:      0.875rem;
  --fs-lg:      1.125rem;
  --fs-xl:      1.375rem;
  --fs-2xl:     1.75rem;
  --fs-3xl:     2.25rem;
  --fs-hero:    clamp(2rem, 5vw, 3.75rem);

  /* Spacing */
  --sp-xs:  0.5rem;
  --sp-sm:  1rem;
  --sp-md:  1.5rem;
  --sp-lg:  2rem;
  --sp-xl:  3rem;
  --sp-2xl: 4rem;
  --sp-3xl: 6rem;

  /* Misc */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --shadow-card: 0 4px 24px hsla(215, 60%, 30%, 0.08);
  --shadow-card-hover: 0 14px 44px hsla(215, 60%, 30%, 0.18);
  --shadow-cta: 0 6px 28px hsla(210, 85%, 52%, 0.35);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---------- Reset ---------- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--ff-primary);
  font-size: var(--fs-base);
  color: var(--clr-gray-700);
  background: var(--clr-ice);
  line-height: 1.6;
  overflow-x: hidden;
}

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

img { max-width: 100%; display: block; }

ul { list-style: none; }

/* ---------- Utility ---------- */
.container {
  width: 90%;
  max-width: 1140px;
  margin: 0 auto;
}

.section-title {
  text-align: center;
  font-size: var(--fs-3xl);
  font-weight: 800;
  color: var(--clr-navy);
  margin-bottom: var(--sp-xl);
  position: relative;
}

.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 4px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--clr-blue-accent), var(--clr-blue-light));
  margin: var(--sp-sm) auto 0;
}

.section-title--dark {
  color: var(--clr-white);
}

.section-title--dark::after {
  background: linear-gradient(90deg, var(--clr-blue-light), var(--clr-sky));
}

/* ============================================================
   HEADER
   ============================================================ */
.header {
  position: relative;
  background: linear-gradient(135deg, var(--clr-navy) 0%, var(--clr-blue) 60%, var(--clr-blue-light) 100%);
  color: var(--clr-white);
  text-align: center;
  padding: var(--sp-3xl) var(--sp-sm) 0;
  overflow: hidden;
}

/* Subtle animated radial glow */
.header::before {
  content: '';
  position: absolute;
  top: -40%;
  left: 50%;
  translate: -50% 0;
  width: 120%;
  height: 120%;
  background: radial-gradient(ellipse at center, hsla(210, 90%, 65%, 0.18) 0%, transparent 70%);
  pointer-events: none;
  animation: pulse 6s ease-in-out infinite alternate;
}

@keyframes pulse {
  0%   { opacity: 0.5; scale: 1; }
  100% { opacity: 1;   scale: 1.1; }
}

.header__container {
  position: relative;
  z-index: 1;
  padding-bottom: var(--sp-2xl);
}

.header__icon {
  font-size: 2.5rem;
  margin-bottom: var(--sp-sm);
  animation: dropletBounce 2s ease-in-out infinite;
}

@keyframes dropletBounce {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-8px); }
}

.header__title {
  font-size: var(--fs-hero);
  font-weight: 900;
  letter-spacing: 0.02em;
  line-height: 1.15;
  text-shadow: 0 2px 20px hsla(218, 60%, 10%, 0.35);
  margin-bottom: var(--sp-xs);
}

.header__tagline {
  font-size: var(--fs-lg);
  font-weight: 400;
  opacity: 0.8;
  max-width: 480px;
  margin: 0 auto;
}

/* Wave divider */
.header__wave {
  position: relative;
  z-index: 1;
  margin-top: -1px;
}

.header__wave svg {
  display: block;
  width: 100%;
  height: 80px;
}

/* ============================================================
   OFFER SECTION
   ============================================================ */
.offer {
  background: var(--clr-ice);
  padding: var(--sp-2xl) 0 var(--sp-3xl);
}

.offer__subtitle {
  text-align: center;
  font-size: var(--fs-2xl);
  font-weight: 700;
  color: var(--clr-navy);
  margin-bottom: var(--sp-xl);
}

/* Services grid – flexbox for natural centering of last item */
.offer__grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--sp-lg);
}

/* ---------- Service Card – BIGGER ---------- */
.card {
  background: var(--clr-white);
  border-radius: var(--radius-lg);
  padding: var(--sp-xl) var(--sp-lg);
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--sp-sm);
  transition: transform var(--transition), box-shadow var(--transition);
  will-change: transform;
  cursor: default;
  flex: 0 1 320px;
  max-width: 360px;
  border: 1px solid hsla(215, 40%, 80%, 0.25);
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-card-hover);
}

.card__icon-wrap {
  flex-shrink: 0;
  width: 68px;
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--clr-sky), var(--clr-blue-accent));
  color: var(--clr-white);
  font-size: 1.5rem;
  box-shadow: 0 6px 18px hsla(210, 85%, 52%, 0.22);
  transition: transform var(--transition);
}

.card:hover .card__icon-wrap {
  transform: scale(1.12) rotate(-6deg);
}

.card__title {
  font-size: var(--fs-lg);
  font-weight: 700;
  color: var(--clr-navy);
}

.card__text {
  font-size: var(--fs-base);
  color: var(--clr-gray-500);
  line-height: 1.6;
}

/* ============================================================
   CTA
   ============================================================ */
.cta {
  text-align: center;
  margin-top: var(--sp-2xl);
}

.cta__label {
  font-size: var(--fs-xl);
  font-weight: 600;
  color: var(--clr-navy);
  margin-bottom: var(--sp-sm);
}

.cta__button {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-sm);
  background: linear-gradient(135deg, var(--clr-blue-accent), var(--clr-blue-light));
  color: var(--clr-white);
  font-family: var(--ff-primary);
  font-size: var(--fs-2xl);
  font-weight: 800;
  letter-spacing: 0.04em;
  padding: var(--sp-md) var(--sp-2xl);
  border-radius: 60px;
  box-shadow: var(--shadow-cta);
  transition: transform var(--transition), box-shadow var(--transition), filter var(--transition);
  will-change: transform;
}

.cta__button:hover {
  transform: translateY(-3px) scale(1.03);
  box-shadow: 0 10px 36px hsla(210, 85%, 52%, 0.45);
  filter: brightness(1.08);
}

.cta__button:active {
  transform: translateY(0) scale(0.98);
}

.cta__button i {
  font-size: 1.4rem;
  animation: ring 1.4s ease-in-out infinite;
}

@keyframes ring {
  0%, 100% { transform: rotate(0deg); }
  15%      { transform: rotate(18deg); }
  30%      { transform: rotate(-14deg); }
  45%      { transform: rotate(10deg); }
  60%      { transform: rotate(-6deg); }
  75%      { transform: rotate(0deg); }
}

/* ============================================================
   ABOUT SECTION
   ============================================================ */
.about {
  position: relative;
  background: var(--clr-white);
  padding: 0 0 var(--sp-3xl);
  content-visibility: auto;
  contain-intrinsic-size: auto 600px;
}

.about__wave-top {
  position: relative;
  z-index: 1;
  background: var(--clr-ice);
}

.about__wave-top svg {
  display: block;
  width: 100%;
  height: 80px;
}

.about__content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-2xl);
  align-items: center;
}

.about__text p {
  font-size: var(--fs-base);
  color: var(--clr-gray-700);
  line-height: 1.8;
  margin-bottom: var(--sp-sm);
}

.about__lead {
  font-size: var(--fs-lg) !important;
  color: var(--clr-gray-900) !important;
}

.about__stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-md);
}

.stat {
  background: var(--clr-ice);
  border-radius: var(--radius-md);
  padding: var(--sp-lg) var(--sp-sm);
  text-align: center;
  transition: transform var(--transition), box-shadow var(--transition);
  border: 1px solid var(--clr-gray-200);
}

.stat:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}

.stat__icon {
  font-size: 1.5rem;
  color: var(--clr-blue-accent);
  margin-bottom: var(--sp-xs);
}

.stat__number {
  font-size: var(--fs-3xl);
  font-weight: 900;
  color: var(--clr-navy);
  line-height: 1.1;
}

.stat__label {
  font-size: var(--fs-sm);
  color: var(--clr-gray-500);
  margin-top: 0.25rem;
}

/* ============================================================
   GALLERY SECTION
   ============================================================ */
.gallery {
  background: linear-gradient(135deg, var(--clr-navy) 0%, var(--clr-navy-mid) 100%);
  padding: var(--sp-3xl) 0;
  content-visibility: auto;
  contain-intrinsic-size: auto 700px;
}

.gallery__intro {
  text-align: center;
  color: hsla(0, 0%, 100%, 0.65);
  font-size: var(--fs-lg);
  margin-top: calc(-1 * var(--sp-md));
  margin-bottom: var(--sp-xl);
}

.gallery__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--sp-lg);
}

.gallery__item {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  cursor: pointer;
  box-shadow: 0 8px 30px hsla(0, 0%, 0%, 0.3);
  transition: transform var(--transition), box-shadow var(--transition);
  will-change: transform;
}

.gallery__item:hover {
  transform: scale(1.03);
  box-shadow: 0 16px 50px hsla(0, 0%, 0%, 0.45);
}

.gallery__item img {
  width: 100%;
  height: 280px;
  object-fit: cover;
  display: block;
  transition: transform 0.5s ease;
}

.gallery__item:hover img {
  transform: scale(1.08);
}

.gallery__caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--sp-md) var(--sp-sm);
  background: linear-gradient(to top, hsla(0, 0%, 0%, 0.7), transparent);
  color: var(--clr-white);
  font-size: var(--fs-sm);
  font-weight: 500;
  transform: translateY(100%);
  transition: transform var(--transition);
}

.gallery__item:hover .gallery__caption {
  transform: translateY(0);
}

/* ============================================================
   LIGHTBOX
   ============================================================ */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: hsla(0, 0%, 0%, 0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.35s ease;
}

.lightbox--open {
  opacity: 1;
  pointer-events: auto;
}

.lightbox__img {
  max-width: 90%;
  max-height: 85vh;
  border-radius: var(--radius-md);
  box-shadow: 0 20px 60px hsla(0, 0%, 0%, 0.6);
  transform: scale(0.9);
  transition: transform 0.35s ease;
}

.lightbox--open .lightbox__img {
  transform: scale(1);
}

.lightbox__close {
  position: absolute;
  top: 1.5rem;
  right: 2rem;
  background: none;
  border: none;
  color: var(--clr-white);
  font-size: 2.5rem;
  cursor: pointer;
  transition: transform var(--transition);
  line-height: 1;
}

.lightbox__close:hover {
  transform: rotate(90deg) scale(1.1);
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  position: relative;
  background: linear-gradient(135deg, var(--clr-navy) 0%, var(--clr-navy-mid) 100%);
  color: var(--clr-white);
}

.footer__wave {
  position: relative;
  z-index: 1;
}

.footer__wave svg {
  display: block;
  width: 100%;
  height: 80px;
}

.footer__container {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: var(--sp-lg);
  width: 90%;
  max-width: 1140px;
  margin: 0 auto;
  padding: var(--sp-lg) 0 var(--sp-xl);
}

/* Left block */
.footer__left {
  display: flex;
  flex-direction: column;
  gap: var(--sp-xs);
}

.footer__name {
  font-size: var(--fs-2xl);
  font-weight: 800;
  letter-spacing: 0.01em;
}

.footer__phone {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: var(--fs-lg);
  font-weight: 500;
  opacity: 0.85;
  transition: opacity var(--transition), color var(--transition);
}

.footer__phone:hover {
  opacity: 1;
  color: var(--clr-sky);
}

/* Right block */
.footer__right {
  display: flex;
  flex-direction: column;
  gap: var(--sp-xs);
}

.footer__location {
  font-size: var(--fs-base);
  opacity: 0.8;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.footer__location i {
  font-size: var(--fs-sm);
  color: var(--clr-blue-light);
}

/* Bottom bar */
.footer__bottom {
  border-top: 1px solid hsla(0, 0%, 100%, 0.1);
  text-align: center;
  padding: var(--sp-sm) var(--sp-sm);
  font-size: var(--fs-sm);
  opacity: 0.5;
}

/* ============================================================
   ANIMATIONS – Staggered fade‑up
   ============================================================ */
.card {
  opacity: 0;
  transform: translateY(32px);
  animation: fadeUp 0.6s ease forwards;
}

.card:nth-child(1) { animation-delay: 0.05s; }
.card:nth-child(2) { animation-delay: 0.12s; }
.card:nth-child(3) { animation-delay: 0.19s; }
.card:nth-child(4) { animation-delay: 0.26s; }
.card:nth-child(5) { animation-delay: 0.33s; }
.card:nth-child(6) { animation-delay: 0.40s; }
.card:nth-child(7) { animation-delay: 0.47s; }

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

.stat {
  opacity: 0;
  transform: translateY(24px);
  animation: fadeUp 0.5s ease forwards;
}

.stat:nth-child(1) { animation-delay: 0.1s; }
.stat:nth-child(2) { animation-delay: 0.2s; }
.stat:nth-child(3) { animation-delay: 0.3s; }
.stat:nth-child(4) { animation-delay: 0.4s; }

.gallery__item {
  opacity: 0;
  transform: translateY(24px);
  animation: fadeUp 0.5s ease forwards;
}

.gallery__item:nth-child(1) { animation-delay: 0.1s; }
.gallery__item:nth-child(2) { animation-delay: 0.2s; }
.gallery__item:nth-child(3) { animation-delay: 0.3s; }
.gallery__item:nth-child(4) { animation-delay: 0.4s; }

/* ============================================================
   RESPONSIVE
   ============================================================ */

/* Tablet */
@media (max-width: 768px) {
  .header {
    padding-top: var(--sp-lg);
    padding-bottom: 0;
  }

  .header__container {
    padding-bottom: var(--sp-sm);
  }

  .header__icon {
    font-size: 1.6rem;
    margin-bottom: var(--sp-xs);
  }

  .header__title {
    font-size: clamp(1.4rem, 5.5vw, 2rem);
  }

  .header__tagline {
    font-size: var(--fs-sm);
  }

  .header__wave svg {
    height: 40px;
  }

  .offer {
    padding: var(--sp-lg) 0 var(--sp-xl);
  }

  .offer__subtitle {
    font-size: var(--fs-lg);
    margin-bottom: var(--sp-md);
  }

  .offer__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
  }

  .offer__grid .card:last-child {
    grid-column: 1 / -1;
    max-width: 50%;
    justify-self: center;
  }

  .card {
    flex: none;
    max-width: 100%;
    padding: var(--sp-sm) var(--sp-xs);
    gap: var(--sp-xs);
    border-radius: var(--radius-sm);
  }

  .card__icon-wrap {
    width: 42px;
    height: 42px;
    font-size: 1rem;
  }

  .card__title {
    font-size: 0.8rem;
  }

  .card__text {
    font-size: 0.75rem;
    line-height: 1.4;
  }

  .cta {
    margin-top: var(--sp-lg);
  }

  .cta__label {
    font-size: var(--fs-base);
  }

  .cta__button {
    font-size: var(--fs-2xl);
    padding: var(--sp-md) var(--sp-xl);
  }

  .about__content {
    grid-template-columns: 1fr;
    gap: var(--sp-lg);
  }

  .gallery__grid {
    grid-template-columns: 1fr;
    gap: var(--sp-md);
  }

  .gallery__item img {
    height: 220px;
  }

  .footer__container {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .footer__right {
    align-items: center;
  }
}

/* Small phones */
@media (max-width: 420px) {
  .header__title {
    font-size: 1.3rem;
  }

  .cta__button {
    font-size: var(--fs-xl);
    padding: var(--sp-sm) var(--sp-lg);
  }

  .about__stats {
    grid-template-columns: 1fr;
  }
}