:root {
  --header-height: 100px;
  --header-height-shrink: 64px;
  --header-padding-x: 20px;
  --transition-fast: 220ms;
  --glass-blur: 10px;
  --glass-color: rgba(255,255,255,0.45);
  --text-color: #111;
}
* { box-sizing: border-box; }
html, body {
  margin: 0;
  height: 100%;
  color: var(--text-color);
}

/* HEADER */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  padding: 0 var(--header-padding-x);
  display: flex;
  align-items: center;
  justify-content: space-between;
  z-index: 1200;
  background-color: rgba(255,255,255,0.8);
  backdrop-filter: blur(var(--glass-blur));
  border-bottom: 1px solid rgba(0,0,0,0.06);
  transition: height var(--transition-fast) ease,
              background-color var(--transition-fast) ease,
              box-shadow var(--transition-fast) ease,
              padding var(--transition-fast) ease,
              transform var(--transition-fast) ease;
}
.site-header.shrink {
  height: var(--header-height-shrink);
  background-color: rgba(255,255,255,0.5);
  box-shadow: 0 6px 18px rgba(10,10,10,0.06);
}
.site-header.hide {
  transform: translateY(-40px);
}

/* INNER HEADER */
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
  padding: 0 20px;
}

/* LOGO */
.logo {
  height: 73px;
  width: auto;
  transition: height var(--transition-fast) ease;
}
.site-header.shrink .logo {
  height: 48px;
}

/* ── DESKTOP NAV ── */
.main-nav ul {
  list-style: none;
  display: flex;
  gap: 14px;
  margin: 0;
  padding: 0;
}
.main-nav a {
  text-decoration: none;
  color: var(--text-color);
  padding: 8px 10px;
  border-radius: 8px;
  font-size: 1.15rem;
  font-family: 'Quicksand', sans-serif;
  transition: background var(--transition-fast),
              font-size var(--transition-fast) ease,
              padding var(--transition-fast) ease;
}
.site-header.shrink .main-nav a {
  font-size: 0.95rem;
  padding: 4px 8px;
}
.main-nav a:hover,
.main-nav a:focus {
  background: rgba(0,0,0,0.06);
  outline: none;
}

/* PAGE PADDING */
.page-content {
  padding-top: calc(var(--header-height) + 16px);
  max-width: 1200px;
  margin: 0 auto;
}

/* CART ICON */
.cart-icon {
  position: absolute;
  top: 26px;
  right: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  cursor: pointer;
  transition: top var(--transition-fast) ease;
}
.site-header.shrink .cart-icon {
  top: 10px;
}

/* HAMBURGER — hidden on desktop */
.hamburger { display: none; }

/* Hide mobile overlay on desktop */
.mobile-nav-overlay {
  display: none;
}

/* ============================================================
   MOBILE (max-width: 720px)
   ============================================================ */
@media (max-width: 720px) {
  :root {
    --header-height: 84px;
    --header-height-shrink: 56px;
  }

  .logo {
    height: 52px;
  }
  .site-header.shrink .logo {
    height: 36px;
  }

  .cart-icon {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    transition: none;
  }
  .site-header.shrink .cart-icon {
    top: 50%;
  }

  /* ── HAMBURGER BUTTON ── */
  .hamburger {
    display: flex;
    position: absolute;
    right: 46px;
    top: 50%;
    transform: translateY(-50%);
    cursor: pointer;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 32px;
    height: 32px;
    background: none;
    border: none;
    padding: 0;
    z-index: 1500;
  }

  .hamburger span {
    display: block;
    position: absolute;
    height: 2px;
    width: 22px;
    background: var(--text-color);
    border-radius: 2px;
    transition: transform 0.38s cubic-bezier(0.23, 1, 0.32, 1),
                opacity 0.22s ease,
                top 0.38s cubic-bezier(0.23, 1, 0.32, 1);
  }
  .hamburger span:nth-child(1) { top: 8px; }
  .hamburger span:nth-child(2) { top: 15px; }
  .hamburger span:nth-child(3) { top: 22px; }

  /* X state */
  .hamburger.open span:nth-child(1) {
    top: 15px;
    transform: rotate(45deg);
  }
  .hamburger.open span:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
  }
  .hamburger.open span:nth-child(3) {
    top: 15px;
    transform: rotate(-45deg);
  }

  /* ── FULL-SCREEN MOBILE NAV OVERLAY ── */
  .mobile-nav-overlay {
    display: flex;
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 1100;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background: rgba(250, 248, 244, 0.72);
    backdrop-filter: blur(28px) saturate(2.2) brightness(1.08);
    -webkit-backdrop-filter: blur(28px) saturate(2.2) brightness(1.08);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.35s cubic-bezier(0.23, 1, 0.32, 1);
  }
  .mobile-nav-overlay.open {
    opacity: 1;
    pointer-events: all;
  }

  /* ── NAV LINKS INSIDE OVERLAY ── */
  .mobile-nav-overlay ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0;
  }
  .mobile-nav-overlay ul li {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.4s ease, transform 0.4s ease;
  }
  .mobile-nav-overlay.open ul li:nth-child(1) { opacity: 1; transform: translateY(0); transition-delay: 0.07s; }
  .mobile-nav-overlay.open ul li:nth-child(2) { opacity: 1; transform: translateY(0); transition-delay: 0.14s; }
  .mobile-nav-overlay.open ul li:nth-child(3) { opacity: 1; transform: translateY(0); transition-delay: 0.21s; }
  .mobile-nav-overlay.open ul li:nth-child(4) { opacity: 1; transform: translateY(0); transition-delay: 0.28s; }
  .mobile-nav-overlay.open ul li:nth-child(5) { opacity: 1; transform: translateY(0); transition-delay: 0.35s; }

  .mobile-nav-overlay ul li a {
    display: block;
    padding: 16px 40px;
    font-size: 2.4rem;
    font-weight: 400;
    font-family: 'Quicksand', sans-serif;
    color: #111;
    text-decoration: none;
    text-align: center;
    letter-spacing: -0.01em;
    transition: opacity 0.2s;
  }
  .mobile-nav-overlay ul li a:hover {
    opacity: 0.4;
  }

  /* Hide desktop nav on mobile */
  .main-nav {
    display: none;
  }

  /* Lock body scroll when menu open */
  body.nav-open {
    overflow: hidden;
  }
}