body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  background:
    radial-gradient(circle at top left, rgba(37, 99, 235, 0.16), transparent 35%),
    radial-gradient(circle at top right, rgba(16, 185, 129, 0.14), transparent 30%),
    linear-gradient(180deg, #0b1220 0%, #060b16 100%);
  color: #e5eefb;
}

.shell {
  max-width: 960px;
  margin: 0 auto;
  padding: 32px 20px 48px;
}

.header {
  margin-bottom: 20px;
}

.eyebrow {
  display: inline-block;
  padding: 6px 10px;
  border: 1px solid rgba(148, 163, 184, 0.25);
  border-radius: 999px;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #93c5fd;
  background: rgba(15, 23, 42, 0.6);
}

h1 {
  margin: 14px 0 8px;
  font-size: clamp(2rem, 5vw, 3.2rem);
  line-height: 1;
}

.subhead {
  margin: 0;
  color: #cbd5e1;
}

.card {
  border: 1px solid rgba(148, 163, 184, 0.18);
  border-radius: 20px;
  background: rgba(15, 23, 42, 0.78);
  box-shadow: 0 18px 60px rgba(2, 6, 23, 0.45);
  backdrop-filter: blur(18px);
}

.card-inner {
  padding: 24px;
}

.stack {
  display: grid;
  gap: 14px;
}

label {
  display: grid;
  gap: 8px;
  font-size: 14px;
  color: #bfdbfe;
}

input,
button {
  font: inherit;
}

input {
  width: 100%;
  box-sizing: border-box;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid rgba(148, 163, 184, 0.25);
  background: rgba(2, 6, 23, 0.72);
  color: #e5eefb;
}

input:focus {
  outline: 2px solid rgba(59, 130, 246, 0.55);
  border-color: rgba(59, 130, 246, 0.65);
}

.actions {
  display: flex;
  gap: 12px;
  align-items: center;
}

button {
  border: 0;
  border-radius: 12px;
  padding: 12px 18px;
  cursor: pointer;
  color: #06101c;
  background: linear-gradient(135deg, #38bdf8, #22c55e);
  font-weight: 700;
}

button.secondary {
  color: #e5eefb;
  background: rgba(30, 41, 59, 0.95);
  border: 1px solid rgba(148, 163, 184, 0.2);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.65;
}

.status {
  min-height: 22px;
  font-size: 14px;
  color: #cbd5e1;
}

.status.error {
  color: #fca5a5;
}

.chat-panel {
  display: none;
}

.messages {
  height: 420px;
  overflow-y: auto;
  padding: 18px;
  border-radius: 18px;
  background: rgba(2, 6, 23, 0.58);
  border: 1px solid rgba(148, 163, 184, 0.15);
}

.message {
  max-width: 82%;
  margin-bottom: 12px;
  padding: 12px 14px;
  border-radius: 16px;
  line-height: 1.45;
  white-space: pre-wrap;
  word-break: break-word;
}

.message.user {
  margin-left: auto;
  background: rgba(59, 130, 246, 0.2);
  border: 1px solid rgba(96, 165, 250, 0.3);
}

.message.ai {
  background: rgba(15, 118, 110, 0.18);
  border: 1px solid rgba(45, 212, 191, 0.26);
}

.composer {
  display: flex;
  gap: 12px;
  margin-top: 14px;
}

.composer input {
  flex: 1;
}

@media (max-width: 640px) {
  .shell {
    padding: 20px 14px 32px;
  }

  .card-inner {
    padding: 18px;
  }

  .composer,
  .actions {
    flex-direction: column;
    align-items: stretch;
  }

  .message {
    max-width: 100%;
  }
}