:root:not([data-theme]) {
  --pico-font-family:
    ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", sans-serif;
  --pico-background-color: #fbfbf8;
  --pico-color: #202421;
  --pico-primary: #376a56;
  --pico-primary-hover: #254d3d;
  --pico-primary-focus: rgba(55, 106, 86, 0.17);
  --pico-muted-color: #747a74;
  --pico-border-radius: 0.45rem;
  --pico-typography-spacing-vertical: 1rem;
}

body {
  background: #fbfbf8;
}

main.container {
  width: 80%;
  max-width: none;
  padding-top: clamp(3.5rem, 9vw, 7rem);
}

.brand {
  display: block;
  font-size: clamp(3.25rem, 9vw, 5.5rem);
  font-weight: 850;
  letter-spacing: -0.05em;
  line-height: 1.15;
  color: #242925;
  margin: 0 0 0.75rem;
}

.brand .typed-cursor {
  color: var(--pico-primary);
  font-weight: 400;
}

.brand #typed {
  text-decoration-line: line-through;
  text-decoration-color: #c0392b;
  text-decoration-thickness: 10px;
  text-decoration-skip-ink: none;
}

.subtitle {
  color: #626e65;
  font-size: clamp(1.05rem, 2.4vw, 1.35rem);
  margin-bottom: 2.65rem;
}

.intro {
  margin: 3.1rem 0 3.5rem;
  font-size: 2rem;
}

h2 {
  font-size: clamp(1.45rem, 3.8vw, 2rem);
  letter-spacing: -0.035em;
  margin-top: 0;
}

section {
  margin: 3.75rem 0;
}

.reading-width {
  max-width: 70ch;
}

.chat {
  border: 1px solid #e5e8e2;
  background: #fff;
  padding: 1.2rem 1.3rem;
  border-radius: 0.8rem;
  margin: 1.2rem 0;
}

.chat-label {
  font-size: 0.79rem;
  color: #798078;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 750;
  margin-bottom: 1rem;
}

.message {
  display: flex;
  gap: 0.85rem;
  align-items: flex-start;
  margin: 0.95rem 0;
}

.avatar {
  flex: 0 0 2.5rem;
  height: 2.5rem;
  border-radius: 0.55rem;
  background: #e6e9ef;
  display: grid;
  place-items: center;
  font-size: 1rem;
  font-weight: 750;
  color: #596477;
}

.avatar.me {
  background: #e5eee8;
  color: var(--pico-primary);
}

.message-body {
  flex: 1;
  min-width: 0;
}

.meta {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.6rem;
  font-size: 0.87rem;
}

.meta time {
  color: #8d938c;
  font-size: 0.75rem;
}

.message-body p {
  margin: 0;
  line-height: 1.5;
}

.badge-wrong,
.badge-right {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  vertical-align: -0.08em;
  margin-right: 0.15rem;
}

.badge-wrong {
  color: #b43d3d;
}

.badge-right {
  color: var(--pico-primary);
}

.badge-wrong svg,
.badge-right svg {
  display: block;
  width: 0.9em;
  height: 0.9em;
}

.aside-note {
  color: #666d66;
  font-size: 0.91rem;
}

.principles {
  padding-left: 1.25rem;
}

.principles li {
  padding-left: 0.25rem;
  margin: 0.8rem 0;
}

.interaction-timeline {
  list-style: none;
  padding: 0;
  margin: 0;
}

.interaction-timeline li {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  position: relative;
  margin: 0;
  padding: 0 0 1.75rem;
}

.interaction-timeline li:last-child {
  padding-bottom: 0;
}

/* Connecting lines */
.interaction-timeline li:not(:last-child)::before {
  content: "";
  position: absolute;
  left: calc(1.125rem - 1px);
  top: 2.5rem;
  bottom: 0.25rem;
  width: 2px;
  background: #e5e8e2;
}

.timeline-icon {
  position: relative;
  z-index: 1;
  flex: 0 0 2.25rem;
  width: 2.25rem;
  height: 2.25rem;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: #f1f3ef;
  color: #747a74;
}

.timeline-icon svg {
  display: block;
  width: 1rem;
  height: 1rem;
  fill: currentColor;
  overflow: visible;
}

.timeline-icon.success {
  background: #e5eee8;
  color: var(--pico-primary);
}

footer {
  border-top: 1px solid #e6e9e3;
  padding: 2rem 0 3.5rem;
  color: #777d76;
  font-size: 0.8rem;
  line-height: 1.65;
}

footer p {
  margin-bottom: 0.75rem;
}

footer p:last-child {
  margin-bottom: 0;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
  }
}

@media (max-width: 560px) {
  main.container {
    width: 100%;
    padding-left: 1.15rem;
    padding-right: 1.15rem;
  }

  .chat {
    padding: 1rem;
  }
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --pico-background-color: #151a17;
    --pico-color: #e5ebe6;
    --pico-primary: #93cdb0;
    --pico-primary-hover: #b1e0c8;
    --pico-primary-focus: rgba(147, 205, 176, 0.2);
    --pico-muted-color: #aeb9b1;
  }

  body {
    background: #151a17;
    color: var(--pico-color);
  }

  .brand {
    color: #f0f4f0;
  }

  .brand #typed {
    text-decoration-color: #e8756c;
  }

  .subtitle,
  .aside-note {
    color: #aeb9b1;
  }

  .chat {
    border-color: #38423b;
    background: #212923;
  }

  .chat-label,
  .meta time {
    color: #a2afa5;
  }

  .avatar {
    background: #323a44;
    color: #c7d0dc;
  }

  .avatar.me,
  .timeline-icon.success {
    background: #2b4235;
  }

  .avatar.me {
    color: #a1d6b9;
  }

  .badge-wrong {
    color: #f08f8f;
  }

  .badge-wrong svg,
  .badge-right svg {
    fill: currentColor;
  }

  .interaction-timeline li:not(:last-child)::before {
    background: #38423b;
  }

  .timeline-icon {
    background: #303933;
    color: #b8c3ba;
  }

  footer {
    border-top-color: #38423b;
    color: #a6b1a8;
  }
}