:root {
  color-scheme: light;
  --bg: #f6f3ee;
  --panel: #ffffff;
  --text: #18212f;
  --muted: #596574;
  --line: #d8d2c7;
  --accent: #1f6f78;
  --accent-dark: #154f56;
  --accent-purple: #5A2D8A;
  --accent-purple-dark: #45226a;
  --user: #e5f2f4;
  --assistant: #f2eee6;
  --error: #8a1f1f;
  --shadow: 0 16px 40px rgba(24, 33, 47, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: Arial, Helvetica, sans-serif;
}

.app-shell {
  position: relative;
  display: grid;
  grid-template-rows: 1fr auto;
  min-height: 100vh;
  overflow: hidden;
}

.main-layout {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(190px, 240px) minmax(0, 1fr);
  gap: 26px;
  align-items: start;
  width: min(100%, 1240px);
  margin: 0 auto;
  padding: 24px 18px;
}

.watermark {
  pointer-events: none;
  user-select: none;
}

.watermark--left,
.watermark--right {
  position: absolute;
  z-index: 0;
  top: 0;
  bottom: var(--footer-height, 58px);
  display: grid;
  place-items: center;
  width: min(4vw, 51px);
  min-width: 29px;
}

.watermark--left {
  left: 18px;
}

.watermark--right {
  right: 18px;
}

.watermark--mobile {
  display: none;
}

.watermark__ribbon {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: fill;
  opacity: 1;
}

.watermark__emblem {
  position: relative;
  z-index: 2;
  width: 78px;
  max-height: 128px;
  object-fit: contain;
  opacity: 0.88;
  transform: translateX(-18px);
}

.watermark__emblem--star {
  width: 82px;
  transform: translateX(-14px);
}

.watermark__emblem--arrows {
  width: 69px;
  max-height: 107px;
  filter:
    drop-shadow(0 0 1px rgba(246, 243, 238, 0.95))
    drop-shadow(0 0 3px rgba(246, 243, 238, 0.9))
    drop-shadow(0 0 7px rgba(246, 243, 238, 0.82));
}

.watermark--right .watermark__emblem--arrows {
  transform: translateX(-10px);
}

.brand-panel {
  display: grid;
  justify-items: center;
  gap: 14px;
  padding-top: 2px;
}

.brand-logo {
  display: block;
  width: min(100%, 228px);
  height: auto;
}

.chat-shell {
  display: grid;
  grid-template-rows: auto auto auto auto;
  gap: 12px;
}

.chat-log {
  height: clamp(360px, 52vh, 520px);
  overflow-y: auto;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.message {
  width: fit-content;
  max-width: min(76ch, 100%);
  margin: 0 0 12px;
  padding: 12px 14px;
  border-radius: 8px;
  line-height: 1.45;
}

.message__label {
  display: block;
  margin-bottom: 4px;
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 700;
}

.message--assistant {
  background: var(--assistant);
}

.message--user {
  margin-left: auto;
  background: var(--user);
}

.message--error {
  color: var(--error);
}

.message--pending {
  color: var(--muted);
  font-style: italic;
}

.starter-panel {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.starter-panel.starter-panel--hidden {
  display: none;
}

.starter-button {
  min-height: 38px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
  font: inherit;
  font-size: 0.92rem;
}

.starter-button:hover,
.starter-button:focus {
  border-color: var(--accent-purple);
  color: var(--accent-purple);
  outline: none;
}

.starter-button[aria-pressed="true"] {
  border-color: var(--accent);
  background: var(--user);
  color: var(--accent-dark);
  font-weight: 700;
}

.chat-form {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 8px;
  align-items: start;
}

.chat-input {
  min-width: 0;
  min-height: 96px;
  resize: vertical;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font: inherit;
  line-height: 1.4;
}

.chat-input:focus {
  border-color: var(--accent-purple);
  outline: 2px solid rgba(90, 45, 138, 0.12);
}

.button {
  min-height: 44px;
  padding: 0 16px;
  border: 1px solid var(--accent-purple);
  border-radius: 8px;
  background: var(--accent-purple);
  color: #ffffff;
  cursor: pointer;
  font: inherit;
  font-weight: 700;
}

.button:disabled {
  opacity: 0.62;
  cursor: wait;
}

.button:hover,
.button:focus {
  background: var(--accent-purple-dark);
}

.button--secondary {
  background: var(--panel);
  color: var(--accent-purple);
}

.button--secondary:hover,
.button--secondary:focus {
  background: rgba(90, 45, 138, 0.08);
  color: var(--accent-purple-dark);
}

.site-footer {
  position: relative;
  z-index: 1;
  background: var(--panel);
  border-top: 1px solid var(--line);
}

.site-footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(100%, 1240px);
  margin: 0 auto;
  padding: 10px 18px;
  gap: 18px;
  color: var(--text);
  font-size: clamp(0.9rem, 1.15vw, 1.05rem);
  line-height: 1.2;
}

.foundation-credit {
  display: flex;
  align-items: center;
  gap: 6px;
  min-width: 0;
}

.footer-brand {
  white-space: nowrap;
}

.footer-brand sup {
  font-size: 0.45em;
  line-height: 0;
}

.foundation-logo {
  display: block;
  width: 38px;
  height: 38px;
  object-fit: contain;
  flex: 0 0 auto;
}

.footer-nav {
  display: flex;
  align-items: center;
  gap: 0;
  flex: 0 0 auto;
}

.footer-nav a {
  color: var(--text);
  text-decoration: none;
  white-space: nowrap;
}

.foundation-link {
  color: var(--text);
  text-decoration: none;
}

.footer-nav a:hover,
.footer-nav a:focus,
.foundation-link:hover,
.foundation-link:focus {
  color: var(--accent-purple);
  text-decoration: underline;
}

.footer-nav a + a::before {
  content: "|";
  display: inline-block;
  margin: 0 8px;
  color: var(--text);
}

.release-footer {
  width: min(100%, 1240px);
  margin: 0 auto;
  padding: 0 18px 10px;
  color: var(--muted);
  font-size: 0.75rem;
  text-align: right;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 640px) {
  .app-shell {
    overflow: visible;
  }

  .watermark--left,
  .watermark--right {
    display: none;
  }

  .watermark--mobile {
    position: relative;
    display: grid;
    place-items: center;
    min-height: 42px;
    margin-top: 4px;
  }

  .watermark--mobile .watermark__emblem {
    width: 76px;
    max-height: 54px;
    transform: none;
  }

  .main-layout {
    grid-template-columns: 1fr;
    justify-items: center;
    gap: 14px;
    padding: 12px;
  }

  .brand-logo {
    width: min(176px, 56vw);
  }

  .chat-shell {
    width: 100%;
  }

  .chat-log {
    height: clamp(300px, 42vh, 390px);
    padding: 12px;
  }

  .chat-form {
    grid-template-columns: 1fr;
  }

  .chat-input {
    min-height: 112px;
  }

  .starter-panel {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 7px;
  }

  .starter-button {
    width: 100%;
    min-height: 40px;
    padding: 0 8px;
    font-size: 0.86rem;
  }

  .button {
    width: 100%;
  }

  .site-footer__inner {
    display: grid;
    justify-items: center;
    gap: 8px;
    padding: 10px 12px;
    font-size: 0.85rem;
    text-align: center;
  }

  .foundation-credit {
    justify-content: center;
    flex-wrap: wrap;
    gap: 4px;
  }

  .foundation-logo {
    display: none;
  }

  .release-footer {
    text-align: center;
  }

  .disclaimer {
    padding: 12px;
  }
}