:root {
  --jm-blue: #012DA4;
  --jm-blue-hover: #012486;
  --jm-blue-soft: #F2F5FF;
  --jm-blue-border: #CCD6F5;
  --jm-text: #111827;
  --jm-text-muted: #6B7280;
  --jm-surface: #FFFFFF;
  --jm-surface-soft: #F8FAFF;
  --jm-border: #E5E7EB;
  --jm-shadow: 0 12px 40px rgba(1, 45, 164, 0.08);
  color: var(--jm-text);
  background: var(--jm-surface);
  font-family: Inter, Arial, Helvetica, sans-serif;
  font-synthesis: none;
}

* { box-sizing: border-box; }
html { background: var(--jm-surface); }
body { margin: 0; min-width: 280px; overflow-x: hidden; background: var(--jm-surface); }
button, textarea { font: inherit; }
button:focus-visible, textarea:focus-visible, a:focus-visible {
  outline: 3px solid var(--jm-blue-border);
  outline-offset: 3px;
}

.shell {
  width: min(960px, 100%);
  margin: 0 auto;
  padding: clamp(44px, 7vw, 88px) clamp(20px, 5vw, 52px) clamp(34px, 6vw, 72px);
}

.hero { max-width: 800px; margin: 0 auto; text-align: center; }
h1 {
  margin: 0;
  color: var(--jm-blue);
  font-family: Inter, Arial, Helvetica, sans-serif;
  font-size: clamp(2.5rem, 6vw, 4.75rem);
  font-weight: 780;
  line-height: .98;
  letter-spacing: -.045em;
}
.hero p {
  max-width: 720px;
  margin: 22px auto 0;
  color: var(--jm-text-muted);
  font-size: clamp(1rem, 2vw, 1.18rem);
  line-height: 1.7;
}
.hero p span { color: var(--jm-blue); font-weight: 700; }

.suggestions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  max-width: 820px;
  margin: 38px auto 28px;
}
.suggestions button {
  min-height: 48px;
  border: 1px solid var(--jm-blue);
  border-radius: 999px;
  background: var(--jm-surface);
  color: var(--jm-blue);
  padding: 11px 18px;
  cursor: pointer;
  transition: background-color 160ms ease, border-color 160ms ease, transform 160ms ease;
}
.suggestions button:hover {
  border-color: var(--jm-blue-hover);
  background: var(--jm-blue-soft);
  transform: translateY(-1px);
}

.conversation {
  width: 100%;
  background: var(--jm-surface);
  border: 1px solid var(--jm-border);
  border-radius: 24px;
  box-shadow: var(--jm-shadow);
  overflow: hidden;
}
.messages:empty { display: none; }
.messages { display: grid; gap: 18px; padding: 28px 28px 0; }
.message { width: fit-content; max-width: min(82%, 680px); }
.message.user { justify-self: end; }
.message.assistant, .message.error { justify-self: start; }
.message-heading { display: flex; align-items: center; gap: 8px; margin: 0 8px 7px; }
.message-label {
  color: var(--jm-text-muted);
  font-size: .72rem;
  font-weight: 750;
  text-transform: uppercase;
  letter-spacing: .07em;
}
.message-avatar, .typing-avatar {
  display: inline-grid;
  place-items: center;
  flex: 0 0 auto;
  width: 27px;
  height: 27px;
  border-radius: 50%;
  background: var(--jm-blue);
  color: var(--jm-surface);
  font-size: .65rem;
  font-weight: 800;
  letter-spacing: .02em;
}
.message p {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  margin: 0;
  padding: 15px 18px;
  border-radius: 18px;
  line-height: 1.65;
}
.message.user p {
  color: var(--jm-surface);
  background: var(--jm-blue);
  border-bottom-right-radius: 5px;
}
.message.assistant p {
  color: var(--jm-text);
  background: var(--jm-surface-soft);
  border: 1px solid var(--jm-blue-border);
  border-bottom-left-radius: 5px;
}
.message.error p {
  color: var(--jm-text);
  background: var(--jm-blue-soft);
  border: 1px solid var(--jm-blue-border);
  border-bottom-left-radius: 5px;
}

.typing {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 22px 28px 0;
  color: var(--jm-blue);
  font-size: .9rem;
  font-weight: 650;
}
.typing[hidden] { display: none; }
.typing-dots { display: inline-flex; align-items: end; gap: 3px; min-width: 24px; }
.typing-dots i {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--jm-blue);
  animation: jm-dot 1.2s infinite ease-in-out;
}
.typing-dots i:nth-child(2) { animation-delay: 140ms; }
.typing-dots i:nth-child(3) { animation-delay: 280ms; }
@keyframes jm-dot {
  0%, 60%, 100% { opacity: .3; transform: translateY(0); }
  30% { opacity: 1; transform: translateY(-3px); }
}

form { padding: 26px 28px 22px; }
label { display: block; margin: 0 0 9px 3px; color: var(--jm-text); font-size: .82rem; font-weight: 750; }
.composer {
  display: flex;
  align-items: end;
  gap: 12px;
  border: 1px solid var(--jm-border);
  border-radius: 18px;
  padding: 10px;
  background: var(--jm-surface);
  transition: border-color 160ms ease, box-shadow 160ms ease;
}
.composer:focus-within { border-color: var(--jm-blue); box-shadow: 0 0 0 3px var(--jm-blue-soft); }
textarea {
  flex: 1;
  min-height: 82px;
  max-height: 220px;
  resize: vertical;
  border: 0;
  outline: 0;
  padding: 9px;
  color: var(--jm-text);
  background: transparent;
  line-height: 1.5;
}
textarea::placeholder { color: var(--jm-text-muted); }
.send {
  min-width: 104px;
  border: 0;
  border-radius: 13px;
  background: var(--jm-blue);
  color: var(--jm-surface);
  padding: 12px 18px;
  font-weight: 750;
  cursor: pointer;
  transition: background-color 160ms ease, opacity 160ms ease;
}
.send:hover { background: var(--jm-blue-hover); }
.send:disabled, .suggestions button:disabled { opacity: .48; cursor: wait; transform: none; }
.form-meta {
  display: flex;
  justify-content: space-between;
  align-items: start;
  gap: 16px;
  margin-top: 11px;
  color: var(--jm-text-muted);
  font-size: .76rem;
}
.text-button { border: 0; background: transparent; color: var(--jm-blue); padding: 0; cursor: pointer; }
.text-button:hover { color: var(--jm-blue-hover); }
.cta {
  display: inline-flex;
  margin-top: 20px;
  color: var(--jm-surface);
  background: var(--jm-blue);
  border-radius: 999px;
  padding: 12px 18px;
  text-decoration: none;
  font-weight: 700;
}
.cta[hidden] { display: none; }

@media (max-width: 620px) {
  .shell { padding: 36px 14px 30px; }
  h1 { font-size: clamp(2.25rem, 12vw, 3.25rem); }
  .hero p { margin-top: 18px; line-height: 1.62; }
  .suggestions { grid-template-columns: 1fr; gap: 9px; margin: 30px 0 22px; }
  .suggestions button { width: 100%; }
  .conversation { border-radius: 20px; }
  .messages { padding: 20px 16px 0; }
  .message { max-width: 94%; }
  .typing { margin: 18px 16px 0; }
  form { padding: 22px 16px 18px; }
  .composer { display: grid; }
  .send { width: 100%; }
  .form-meta > span { max-width: 68%; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
  .typing-dots i { animation: none; opacity: 1; transform: none; }
}