/* ==========================================================================
   header.css — floating pill header, language switch, mobile menu,
   scroll progress bar, project dots, back-to-top, toast
   ========================================================================== */
.progress {
  position: fixed; top: 0; left: 0; right: 0; height: 3px; z-index: 110;
  pointer-events: none;
}
.progress i {
  display: block; height: 100%; background: var(--blue);
  transform-origin: 0 50%; transform: scaleX(var(--p, 0));
}

.top {
  position: fixed; z-index: 100;
  top: calc(env(safe-area-inset-top, 0px) + 12px);
  left: var(--gut); right: var(--gutr);
  display: flex; justify-content: center;
  pointer-events: none;
  transition: translate .55s var(--ease);
}
.top.is-hidden { translate: 0 -160%; }
.top-in {
  pointer-events: auto; position: relative;
  width: min(1160px, 100%);
  display: flex; align-items: center; gap: 14px;
  padding: 8px 8px 8px 22px;
  border-radius: var(--r-btn);
  background: color-mix(in srgb, var(--paper) 80%, transparent);
  -webkit-backdrop-filter: blur(16px) saturate(1.5);
  backdrop-filter: blur(16px) saturate(1.5);
  border: 1px solid color-mix(in srgb, var(--ink) 9%, transparent);
  box-shadow: 0 18px 40px -30px rgba(0, 0, 0, .45);
}
.brand {
  display: inline-flex; align-items: center; gap: 10px;
  margin-right: auto; text-decoration: none;
  font: 700 13px/1 var(--wide); letter-spacing: -.01em; white-space: nowrap;
}
.brand-mark { width: 18px; height: 18px; color: var(--blue); display: inline-flex; }
.brand-mark svg { width: 100%; height: 100%; animation: spin 14s linear infinite; }

.nav { display: flex; gap: 2px; }
.nav a {
  text-decoration: none; padding: 9px 14px; border-radius: var(--r-btn);
  color: color-mix(in srgb, var(--ink) 65%, transparent);
  transition: background-color .3s var(--ease), color .3s var(--ease);
}
.nav a:hover { color: var(--ink); background: color-mix(in srgb, var(--ink) 7%, transparent); }
.nav a[aria-current="true"] { background: var(--ink); color: var(--paper); }

.lang { display: flex; background: color-mix(in srgb, var(--ink) 7%, transparent); border-radius: var(--r-btn); padding: 3px; }
.lang button {
  font: 700 11px/1 var(--mono); padding: 9px 12px; border: 0; border-radius: var(--r-btn);
  background: transparent; color: var(--ink); cursor: pointer;
  transition: background-color .3s var(--ease), color .3s var(--ease);
}
.lang button[aria-pressed="true"] { background: var(--ink); color: var(--paper); }

.menu-btn {
  display: none; width: 42px; height: 42px; border: 0; border-radius: 50%;
  background: color-mix(in srgb, var(--ink) 7%, transparent); cursor: pointer;
  position: relative;
}
.menu-btn span {
  position: absolute; left: 13px; right: 13px; height: 2px; border-radius: 2px; background: var(--ink);
  transition: translate .35s var(--ease), rotate .35s var(--ease);
}
.menu-btn span:nth-child(1) { top: 16px; }
.menu-btn span:nth-child(2) { top: 24px; }
.menu-btn[aria-expanded="true"] span:nth-child(1) { translate: 0 4px; rotate: 45deg; }
.menu-btn[aria-expanded="true"] span:nth-child(2) { translate: 0 -4px; rotate: -45deg; }

@media (max-width: 760px) {
  .menu-btn { display: block; }
  .nav {
    position: absolute; top: calc(100% + 10px); left: 0; right: 0;
    flex-direction: column; gap: 2px; padding: 10px;
    background: var(--paper); border-radius: var(--r-card);
    border: 1px solid color-mix(in srgb, var(--ink) 9%, transparent);
    box-shadow: 0 30px 50px -30px rgba(0, 0, 0, .5);
    opacity: 0; visibility: hidden; translate: 0 -10px;
    transition: opacity .3s var(--ease), translate .4s var(--ease), visibility 0s .4s;
  }
  .nav.is-open { opacity: 1; visibility: visible; translate: 0 0; transition-delay: 0s; }
  .nav a { padding: 14px 16px; font-size: 13px; }
}

/* project dots — inverted against whatever colour is behind them */
.dots {
  position: fixed; z-index: 60; top: 50%; translate: 0 -50%;
  right: max(18px, env(safe-area-inset-right, 0px));
  display: flex; flex-direction: column; gap: 6px;
  mix-blend-mode: difference;
  opacity: 0; pointer-events: none; transition: opacity .5s var(--ease);
}
.dots.is-visible { opacity: 1; pointer-events: auto; }
.dots a { display: grid; place-items: center; width: 22px; height: 22px; border-radius: 50%; }
.dots a::before {
  content: ""; width: 9px; height: 9px; border-radius: 50%; background: #fff; opacity: .45;
  transition: scale .4s var(--ease-spring), opacity .3s;
}
.dots a:hover::before { opacity: 1; scale: 1.25; }
.dots a[aria-current="true"]::before { opacity: 1; scale: 1.55; }
@media (max-width: 1000px) { .dots { display: none; } }

.to-top {
  position: fixed; z-index: 70; width: 50px; height: 50px; border: 0; border-radius: 50%;
  right: max(18px, env(safe-area-inset-right, 0px)); bottom: max(18px, env(safe-area-inset-bottom, 0px));
  background: var(--ink); color: var(--paper); cursor: pointer;
  display: grid; place-items: center; overflow: hidden; isolation: isolate;
  opacity: 0; translate: 0 24px; pointer-events: none;
  transition: opacity .4s var(--ease), translate .5s var(--ease), background-color .3s;
}
.to-top.is-visible { opacity: 1; translate: 0 0; pointer-events: auto; }
.to-top:hover { background: var(--blue); }
.to-top svg { width: 20px; height: 20px; transition: translate .3s var(--ease); }
.to-top:hover svg { translate: 0 -3px; }

.toast {
  position: fixed; z-index: 130; left: 50%; translate: -50% 30px;
  bottom: max(24px, calc(env(safe-area-inset-bottom, 0px) + 16px));
  padding: 12px 20px; border-radius: var(--r-btn); background: var(--ink); color: var(--paper);
  font: 700 12px/1 var(--mono); letter-spacing: .06em; text-transform: uppercase;
  opacity: 0; pointer-events: none;
  transition: opacity .35s var(--ease), translate .45s var(--ease);
}
.toast.is-on { opacity: 1; translate: -50% 0; }