html, body {
  margin: 0;
  height: 100%;
}
body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: #000;
}

/* Mobile / default: #app fills the viewport, frame chrome is invisible. */
.phone-frame {
  width: 0;
  height: 0;
}
.phone-notch,
.phone-button {
  display: none;
}
.phone-screen {
  display: contents;
}
#app {
  position: fixed;
  inset: 0;
  background: #fff;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

/* --- Screens (state machine) --- */
.screen {
  display: none;
  flex: 1;
  flex-direction: column;
  padding: 64px 34px 24px;
  box-sizing: border-box;
  background: #fff;
  color: #111;
  min-height: 0;
}
.screen[data-active] {
  display: flex;
}
.screen:has(.screen__video) {
  padding-bottom: 0;
}

.screen__text {
  font-size: 22px;
  line-height: 1.35;
}
.screen__text--small {
  font-size: 16px;
  opacity: 0.7;
}
.screen__hint {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  font-style: italic;
  font-size: 18px;
  opacity: 0.75;
  padding: 0 8px;
}

.screen__btn {
  display: block;
  width: 100%;
  max-width: 320px;
  margin: 16px auto;
  padding: 18px 20px;
  border: none;
  border-radius: 12px;
  font-size: 22px;
  font-weight: 600;
  font-family: inherit;
  color: #374151;
  cursor: pointer;
}
.screen__btn--cyan {
  background: #dbeafe;
}
.screen__btn--yellow {
  background: #fef3c7;
}
.screen__buttons {
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: center;
  padding-top: 32px;
}

.screen__video {
  margin-top: auto;
  margin-left: -60px;
  margin-right: -60px;
  width: calc(100% + 120px);
  height: auto;
  display: block;
  background: transparent;
}

/* Results overlay */
.results-overlay {
  padding-top: 32px;
  transition: opacity 600ms ease;
}
.results-overlay--hidden {
  opacity: 0;
  pointer-events: none;
}
.results-overlay h2 {
  font-size: 24px;
  margin: 0 0 24px;
}
.results-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 22px;
  font-weight: 700;
  margin: 12px 0;
  background: linear-gradient(to right, var(--bar-color, transparent) var(--bar-pct, 0%), transparent var(--bar-pct, 0%));
}
.results-row:has(.hl--cyan) { --bar-color: #dbeafe; }
.results-row:has(.hl--yellow) { --bar-color: #fef3c7; }
.hl {
  padding: 7px 8px;
  color: #374151;
}

/* Credits — black bg overrides default */
.screen--credits {
  background: #000;
  color: #fff;
  align-items: center;
  text-align: center;
  justify-content: space-between;
  padding: 88px 34px 48px;
}
.screen--credits h1 {
  font-size: 28px;
  letter-spacing: 0.02em;
  margin: 0;
}
.screen--credits hr {
  width: 60%;
  border: 0;
  border-top: 1px solid #fff;
  margin: 24px auto;
}
.credits__authors {
  font-size: 16px;
}
.credits__dates {
  font-size: 14px;
  line-height: 1.4;
}
.credits__dates p {
  margin: 10px 0;
}
.credits__dates strong {
  font-weight: 700;
}
.credits__contact {
  margin-top: 18px !important;
  opacity: 0.85;
}
.credits__footnote {
  font-size: 14px;
  opacity: 0.85;
}

/* Desktop: only when there's room AND a fine pointer (mouse). */
@media (min-width: 768px) and (pointer: fine) {
  body {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: rgb(51, 65, 85);
  }

  .phone-frame {
    position: relative;
    box-sizing: border-box;
    height: min(85vh, 780px);
    aspect-ratio: 9 / 19.5;
    width: auto;
    background: #000;
    border-radius: 44px;
    padding: 12px;
    box-shadow:
      0 30px 80px rgba(0, 0, 0, 0.5),
      inset 0 0 0 2px #2a2a2a;
  }

  .phone-screen {
    display: block;
    position: relative;
    width: 100%;
    height: 100%;
    border-radius: 32px;
    overflow: hidden;
    background: #fff;
  }

  #app {
    position: absolute;
    inset: 0;
    background: #fff;
  }

  .phone-notch {
    display: block;
    position: absolute;
    top: 18px;
    left: 50%;
    transform: translateX(-50%);
    width: 32%;
    height: 22px;
    background: #000;
    border-radius: 999px;
    z-index: 2;
  }

  .phone-button {
    display: block;
    position: absolute;
    background: #2a2a2a;
  }
  .phone-button--power {
    right: -2px;
    top: 24%;
    width: 3px;
    height: 11%;
    border-radius: 0 2px 2px 0;
  }
  .phone-button--volume-up {
    left: -2px;
    top: 19%;
    width: 3px;
    height: 7%;
    border-radius: 2px 0 0 2px;
  }
  .phone-button--volume-down {
    left: -2px;
    top: 28%;
    width: 3px;
    height: 7%;
    border-radius: 2px 0 0 2px;
  }
}