/* ========== Reset & zmienne (spójne z header/footer) ========== */
* { box-sizing: border-box; margin: 0; padding: 0; }

:root{
  --bg: #f7f7f8;          /* jasne tło strony */
  --bg-2: #ffffff;        /* powierzchnie, karty */
  --text: #1f2328;        /* główny tekst */
  --muted: #6b7280;       /* opis/sekundarny */
  --accent: #f58220;      /* pomarańcz z loga */
  --line: #e6e7ea;
  --shadow: 0 8px 24px rgba(16,24,40,.08);
  --radius: 10px;
  --transition: .25s ease;

  /* zdjęcie pod sekcją USP */
  --hero-img: url("img/hero.jpg");

  /* Animacje USP */
  --usp-icon-delay: 0s;
  --usp-text-delay: 0s;
}

/* ================================
   USP (Zalety)
   ================================ */
.usp {
  position: relative;
  padding: clamp(24px, 6vw, 64px) 20px;

  /* Desktop: zdjęcie w tle */
  background-image: var(--hero-img);
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
  background-attachment: fixed;
  z-index: 1;
}

/* Overlay – delikatniejszy */
.usp::before {
  content: "";
  position: absolute;
  inset: 0;
  backdrop-filter: blur(2px);
  z-index: 0;
}

/* Mobile – jasne, jednolite tło */
@media (max-width: 1024px) {
  .usp {
    background-image: none;
    background: var(--bg-2);
    background-attachment: scroll;
  }
  .usp::before { background: none; }
}

.usp .container {
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

/* Lista */
.usp__list{
  display: grid;
  grid-template-columns: 1fr;
  row-gap: clamp(48px, 6vw, 96px);
}

/* Pojedynczy punkt */
.usp__item{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(24px, 5vw, 64px);
  min-height: clamp(140px, 20vw, 260px);
}
.usp__item:nth-child(even){ flex-direction: row; }
.usp__item:nth-child(odd) { flex-direction: row-reverse; }

/* Tekst */
.usp__text{
  display: grid;
  gap: 8px;
  max-width: 720px;
}
.usp__text strong{
  font-size: clamp(28px, 5.4vw, 64px);
  line-height: 1.05;
  font-weight: 800;
  letter-spacing: 0.2px;
  color: var(--text);
}
.usp__text span{
  font-size: clamp(15px, 2.2vw, 22px);
  line-height: 1.45;
  color: var(--muted);
}

/* Ikona */
.usp__iconwrap{ flex: 0 0 auto; }
.usp__icon{
  width: clamp(44px, 6.4vw, 84px);
  height: clamp(44px, 6.4vw, 84px);
  fill: none;
  stroke: var(--accent);
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* ========== Animacje na scroll ========== */
.reveal-text,
.reveal-icon{
  opacity: 0;
  will-change: transform, opacity;
}
/* Tekst */
.reveal-text{
  transform: translateY(18px);
  transition: opacity .65s ease, transform .7s ease;
}
/* Ikona */
.reveal-icon{
  transform: translateX(var(--edge-shift, 40vw));
  transition: opacity 1s ease, transform 1.5s cubic-bezier(.22,.61,.36,1);
}
/* Kierunki */
.usp__item:nth-child(even){ --edge-shift: -30vw; }
.usp__item:nth-child(odd) { --edge-shift:  30vw; }
/* Aktywacja */
.usp__item.is-in .reveal-text{
  opacity: 1;
  transform: none;
  transition-delay: var(--usp-text-delay) !important;
}
.usp__item.is-in .reveal-icon{
  opacity: 1;
  transform: translateX(0);
  transition-delay: var(--usp-icon-delay) !important;
}

/* ========== Responsywność ========== */
@media (max-width: 640px){
  .usp__item{
    gap: clamp(14px, 6vw, 24px);
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-start;
  }

  .usp__text { max-width: 70%; }

  .usp__icon{
    width: clamp(40px, 10vw, 60px);
    height: clamp(40px, 10vw, 60px);
  }
  .usp__text strong{
    font-size: clamp(26px, 8.5vw, 42px);
  }
  .usp__text span{
    font-size: clamp(14px, 3.8vw, 18px);
  }
  :root{ --usp-icon-delay: .08s; }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce){
  .reveal-text, .reveal-icon,
  .usp__item.is-in .reveal-text,
  .usp__item.is-in .reveal-icon{
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}

/* Naprawa layoutu */
body { overflow-x: hidden; }
.usp, .usp__item { overflow: clip; }
@supports not (overflow: clip) {
  .usp, .usp__item { overflow: hidden; }
}
/* ============================= */
/* USP – frosted cards (desktop) */
/* ============================= */
@media (min-width: 1025px){
  .usp__item{
    position: relative;
    padding: clamp(18px, 2vw, 28px) clamp(18px, 3vw, 32px);
    border-radius: 16px;                /* dla lepszego klipu pseudo-elementu */
    isolation: isolate;                 /* poprawne warstwowanie */
  }

  /* półprzezroczysta karta za treścią (bez zmian w HTML) */
  .usp__item::before{
    content:"";
    position: absolute;
    inset: -6px;                        /* minimalny „oddech” wokół treści */
    border-radius: 18px;
    background: rgba(255,255,255,.62);  /* delikatna biel */
    border: 1px solid rgba(230,231,234,.95); /* widoczna ramka */
    box-shadow: 0 10px 28px rgba(16,24,40,.14);
    backdrop-filter: blur(3px);
    -webkit-backdrop-filter: blur(3px);
    z-index: 0;                         /* pod treścią */
    transition:
      transform .35s ease,
      box-shadow .35s ease,
      border-color .35s ease,
      background-color .35s ease;
  }

  /* efekt przy wejściu w viewport (masz klasę .is-in) i na hover */
  .usp__item.is-in::before,
  .usp__item:hover::before{
    transform: translateY(-2px);
    box-shadow: 0 16px 40px rgba(16,24,40,.18);
    border-color: rgba(245,130,32,.45);             /* akcent w ramce */
    background-color: rgba(255,255,255,.72);        /* odrobinę jaśniej */
  }

  /* delikatny akcentowy „ring” dla ikony */
  .usp__iconwrap{
    position: relative;
  }
  .usp__iconwrap::after{
    content:"";
    position:absolute;
    inset: -10px;
    border-radius: 50%;
    background: radial-gradient(
      circle at 50% 50%,
      rgba(245,130,32,.12) 0%,
      rgba(245,130,32,.08) 50%,
      transparent 66%
    );
    opacity: .9;
    z-index: -1;
    transition: transform .35s ease, opacity .35s ease;
  }
  .usp__item:hover .usp__iconwrap::after,
  .usp__item.is-in .usp__iconwrap::after{
    transform: scale(1.06);
    opacity: 1;
  }

  /* żeby treść zawsze była nad pseudo-elementem karty */
  .usp__text, .usp__iconwrap { position: relative; z-index: 1; }
}

/* Mobile zostaje jak jest (bez kart), ale lekko wzmacniamy kontrast ikon */
@media (max-width: 1024px){
  .usp__icon{
    filter: drop-shadow(0 2px 4px rgba(245,130,32,.15));
  }
}