/**
 * Cross-browser layout & rendering fallbacks — load before page styles.
 */

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Sticky headers (legacy WebKit) */
.proto-nav,
.guide-header,
.legal-header,
.prototype-v10 .v10-top-bar {
  position: -webkit-sticky;
  position: sticky;
}

/* Dynamic viewport units */
.interview-panel__sheet {
  max-height: 100vh;
  max-height: 100dvh;
}

@media (max-width: 480px) {
  .modal {
    max-height: 90vh;
    max-height: 90dvh;
  }
}

/* aspect-ratio fallbacks */
@supports not (aspect-ratio: 16 / 9) {
  .prototype-v10 #agents .agent-card__banner {
    position: relative;
    height: 0;
    padding-bottom: 56.25%;
    max-height: none;
  }

  .prototype-v10 #agents .agent-card__banner .agent-portrait {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
  }
}

/* Flex gap fallback (Safari < 14.1) */
@supports not (gap: 1rem) {
  .proto-nav__inner {
    flex-wrap: wrap;
  }

  .proto-nav__links a + a {
    margin-left: 0.85rem;
  }

  .proto-nav__actions > * + * {
    margin-left: 0.45rem;
  }

  .d3-hub__top {
    display: block;
  }

  .d3-hub__nl-strip {
    margin-top: 1rem;
  }

  .email-row > * + * {
    margin-left: 0.5rem;
  }
}

/* Grid gap fallback */
@supports not (gap: 1rem) {
  .d3-hub__nl-controls {
    display: flex;
    flex-wrap: wrap;
  }

  .d3-hub__nl-controls > * + * {
    margin-left: 0.6rem;
  }
}

/* Backdrop-filter solid fallback */
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .guide-header,
  .legal-header {
    background: rgba(253, 248, 244, 0.98);
  }

  .d3-enquiry-form--band {
    background: rgba(255, 255, 255, 0.92);
  }

  .o2c-flow {
    background: rgba(255, 253, 248, 0.95);
  }
}

/* iOS form control quirks */
input,
textarea,
select,
button {
  font: inherit;
}

input[type="email"],
input[type="text"],
input[type="search"],
textarea,
select {
  -webkit-appearance: none;
  appearance: none;
}

/* Touch tap highlight */
a,
button {
  -webkit-tap-highlight-color: rgba(201, 74, 66, 0.15);
}

/* Smooth scroll only when supported */
@supports not (scroll-behavior: smooth) {
  html {
    scroll-behavior: auto;
  }
}