/* ==================================================
   MENU.CSS – Vienna Salsa Studio (Clean Version)
   - Fixed Header
   - Hero Theme Support (dark / light)
   - Scroll → Glass
   - Mobile Fullscreen Nav
   - Burger always black when nav-open
================================================== */

html { scroll-behavior: smooth; }

:root{
  --text: #0b1020;
  --line: rgba(11,16,32,.10);
  --bgGlass: rgba(251,251,253,.72);

  --salsa: #ff3b30;
  --mango: #ffb000;
}

/* ==================================================
   HEADER BASE
================================================== */

.site-header{
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;

  /* State variables */
  --header-bg: transparent;
  --header-border: transparent;
  --nav-fg: rgba(11,16,32,.78);
  --nav-fg-hover: rgba(11,16,32,.95);
  --burger: rgba(11,16,32,.78);

  background: var(--header-bg);
  border-bottom: 1px solid var(--header-border);

  transition:
    background .25s ease,
    border-color .25s ease,
    backdrop-filter .25s ease;
}

/* ==================================================
   GLASS STATE (scroll or no hero)
================================================== */

.site-header.is-glass{
  --header-bg: var(--bgGlass);
  --header-border: var(--line);

  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

/* ==================================================
   HERO THEMES
================================================== */

/* Hero Dark (default) → white nav */
.site-header.is-on-hero.hero-dark{
  --nav-fg: rgba(255,255,255,.92);
  --nav-fg-hover: #ffffff;
  --burger: rgba(255,255,255,.95);

  --header-bg: transparent;
  --header-border: transparent;
}

/* Hero Light → dark nav */
.site-header.is-on-hero.hero-light{
  --nav-fg: rgba(11,16,32,.78);
  --nav-fg-hover: rgba(11,16,32,.95);
  --burger: rgba(11,16,32,.78);

  --header-bg: transparent;
  --header-border: transparent;
}

/* ==================================================
   LAYOUT
================================================== */

.nav-wrap{
  max-width: 1120px;
  margin: 0 auto;
  padding: 8px 20px;

  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 14px;
}

/* ==================================================
   LOGO SWITCH
================================================== */

.brand{
  position: relative;
  display: flex;
  align-items: center;
}

.brand-logo{
  height: 42px;
  width: auto;
  display: block;
  transition: opacity .25s ease;
}

.brand-logo--light{
  position: absolute;
  top: 0;
  left: 0;
  opacity: 0;
}

/* White logo only on hero-dark */
.site-header.is-on-hero.hero-dark .brand-logo--dark{ opacity: 0; }
.site-header.is-on-hero.hero-dark .brand-logo--light{ opacity: 1; }

/* ==================================================
   NAVIGATION
================================================== */

.site-nav{
  display:flex;
  align-items:center;
  justify-content:center;
  gap: 18px;
}

.nav-list{
  list-style:none;
  display:flex;
  gap: 18px;
  padding:0;
  margin:0;
  align-items:center;
}

.nav-list a{
  position: relative;
  display:inline-flex;
  align-items:center;

  padding: 10px 6px;
  text-decoration:none;

  color: var(--nav-fg);
  font-weight: 850;
  font-size: 14px;

  transition: color .18s ease;
}

.nav-list a:hover{
  color: var(--nav-fg-hover);
}

/* underline */
.nav-list a::after{
  content:"";
  position:absolute;
  left:0;
  bottom:4px;
  width:100%;
  height:2px;
  border-radius:999px;
  background: linear-gradient(135deg, var(--salsa), var(--mango));
  transform: scaleX(0);
  transform-origin:center;
  transition: transform .25s ease;
}

.nav-list a:hover::after,
.nav-list a.is-active::after,
.nav-list .current-menu-item > a::after{
  transform: scaleX(1);
}

/* ==================================================
   CTA
================================================== */

.nav-cta{
  display:flex;
  justify-content:flex-end;
  align-items:center;
}

.nav-cta--desktop{ display:flex; }
.nav-cta--mobile{ display:none; }

.btn{
  appearance:none;
  border:1px solid rgba(11,16,32,.14);
  background:rgba(255,255,255,.78);
  color:rgba(11,16,32,.92);

  padding:10px 14px;
  border-radius:14px;

  font-weight:850;
  font-size:14px;
  text-decoration:none;

  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;

  cursor:pointer;

  transition: transform .15s ease,
              background .15s ease,
              border-color .15s ease,
              box-shadow .15s ease,
              filter .15s ease;
}

.btn:not(.btn-primary):hover{
  transform:translateY(-1px);
  background:rgba(255,255,255,.92);
  border-color:rgba(11,16,32,.22);
  box-shadow:0 8px 22px rgba(13,18,40,.10);
}

.btn-primary{
  border:0;
  color:#1b0b0d;
  background:linear-gradient(135deg, var(--salsa), var(--mango));
  box-shadow:0 12px 28px rgba(255,59,48,.18);
}

.btn-primary:hover{
  transform:translateY(-1px);
  filter:brightness(1.04);
  box-shadow:0 18px 44px rgba(255,59,48,.28);
}

/* Non-primary CTA readable on hero-dark */
.site-header.is-on-hero.hero-dark .btn:not(.btn-primary){
  color:#fff;
  border-color:rgba(255,255,255,.35);
  background:rgba(255,255,255,.12);
}

/* ==================================================
   BURGER
================================================== */

.nav-toggle{
  display:none;
  width:44px;
  height:44px;
  border-radius:12px;
  border:none;
  background:none;
  cursor:pointer;
  position:relative;
  z-index:1201;
}

.nav-toggle-bar{
  position:absolute;
  left:50%;
  width:18px;
  height:2px;
  background:var(--burger);
  border-radius:999px;

  transform:translateX(-50%);
  transition:transform .4s ease, opacity .18s ease;
  will-change:transform, opacity;
}

.nav-toggle-bar:nth-child(1){ top:14px; }
.nav-toggle-bar:nth-child(2){ top:21px; }
.nav-toggle-bar:nth-child(3){ top:28px; }

.nav-toggle.is-open .nav-toggle-bar:nth-child(1){
  transform:translateX(-50%) translateY(7px) rotate(45deg);
}

.nav-toggle.is-open .nav-toggle-bar:nth-child(2){
  opacity:0;
  transform:translateX(-50%) scaleX(.6);
}

.nav-toggle.is-open .nav-toggle-bar:nth-child(3){
  transform:translateX(-50%) translateY(-7px) rotate(-45deg);
}

/* ==================================================
   MOBILE
================================================== */

@media (max-width:920px){

  .nav-wrap{
    display:flex;
    justify-content:space-between;
    align-items:center;
    padding:8px 14px;
  }

  .nav-toggle{ display:flex; }

  .nav-cta--desktop{ display:none; }
  .nav-cta--mobile{ display:flex; }

  .site-nav{
    position:fixed;
    inset:0;
    height:100dvh;

    background:rgb(251,251,253);
    backdrop-filter:blur(14px);
    -webkit-backdrop-filter:blur(14px);

    padding:78px 18px 18px;

    flex-direction:column;
    align-items:stretch;
    justify-content:flex-start;
    gap:16px;

    transform:translateX(105%);
    transition:transform .35s ease;
    z-index:1100;
  }

  .site-nav.is-open{ transform:translateX(0); }

  .nav-list{
    flex-direction:column;
    align-items:stretch;
    gap:10px;
    margin-top:6px;
  }

  .nav-list a{
    padding:14px 12px;
    font-size:16px;
  }

  .nav-cta--mobile{
    margin-top:8px;
    justify-content:flex-start;
  }

  .nav-cta--mobile .btn{
    width:clamp(160px,50%,260px);
    padding:12px 14px;
    border-radius:16px;
  }

  html.nav-open .nav-toggle{
    position:fixed;
    top:calc(14px + env(safe-area-inset-top));
    right:calc(14px + env(safe-area-inset-right));
    z-index:2000;
    transform:translateZ(0);
  }
}

/* ==================================================
   MOBILE MENU OPEN → ALWAYS DARK BURGER
================================================== */

html.nav-open .site-header,
html.nav-open .site-header.is-on-hero,
html.nav-open .site-header.is-on-hero.hero-dark,
html.nav-open .site-header.is-on-hero.hero-light{
  --burger: rgba(11,16,32,.9);
  --nav-fg: rgba(11,16,32,.9);
  --nav-fg-hover: rgba(11,16,32,1);
}

html.nav-open .site-header .brand-logo--dark{ opacity:1; }
html.nav-open .site-header .brand-logo--light{ opacity:0; }

html.nav-open,
html.nav-open body{
  overflow:hidden;
}

/* ==================================================
   REDUCED MOTION
================================================== */

@media (prefers-reduced-motion: reduce){
  .nav-list a,
  .nav-list a::after,
  .btn,
  .site-nav,
  .nav-toggle-bar{
    transition:none !important;
  }
}

/* Dynamic gradient base value */
.site-header{ --hero-grad-opacity: 0; }

.site-header.is-on-hero.hero-dark::before{
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: -1;

  background: linear-gradient(
    to bottom,
    rgba(0,0,0,calc(0.75 * var(--hero-grad-opacity))),
    rgba(0,0,0,calc(0.42 * var(--hero-grad-opacity))) 45%,
    rgba(0,0,0,0)
  );

  transition: opacity .2s linear;
}

.site-header.is-on-hero.hero-light{
  text-shadow: 0 0.5px 0 rgba(255,255,255,.3);
}

.site-header.is-on-hero.hero-light::before{
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: -1;

  background: linear-gradient(
    to bottom,
    rgba(255,255,255,calc(0.78 * var(--hero-grad-opacity))),
    rgba(255,255,255,calc(0.45 * var(--hero-grad-opacity))) 45%,
    rgba(255,255,255,0)
  );

  transition: opacity .2s linear;
}

html.nav-open .site-header::before{
  opacity: 0;
}