:root {
  --bg: #f7fcff;
  --bowl: #e5f4ff;
  --fg: #1a2b3c;
  --accent: #ff8b3d;
  --accent-dark: #e06b1d;
  --muted: #6a7b8c;
  --card: #ffffff;
  --radius: 16px;
  --shadow: 0 4px 20px rgba(30, 60, 90, 0.08);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: linear-gradient(180deg, var(--bg) 0%, var(--bowl) 100%);
  color: var(--fg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 20px;
}

header {
  text-align: center;
  margin-bottom: 30px;
}

.logo {
  width: 80px;
  height: 80px;
  display: block;
  margin: 0 auto 8px;
}

h1 {
  margin: 0;
  font-size: 2.2rem;
  letter-spacing: -0.02em;
  color: var(--accent);
}

.tagline {
  margin: 4px 0 0;
  color: var(--muted);
  font-style: italic;
  font-size: 0.95rem;
}

main {
  width: 100%;
  max-width: 640px;
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
}

#status {
  text-align: center;
  color: var(--muted);
  padding: 10px;
  margin-bottom: 16px;
  font-size: 0.9rem;
}

#status.ready {
  color: var(--accent-dark);
  font-weight: 600;
}

#output {
  min-height: 200px;
  max-height: 400px;
  overflow-y: auto;
  padding: 12px;
  background: #f0f8ff;
  border-radius: 12px;
  margin-bottom: 16px;
  font-size: 0.95rem;
  line-height: 1.5;
}

.msg {
  margin-bottom: 12px;
}

.msg.user {
  text-align: right;
  color: var(--fg);
}

.msg.glub {
  color: var(--accent-dark);
}

form {
  display: flex;
  gap: 8px;
}

#prompt {
  flex: 1;
  padding: 12px 16px;
  border: 2px solid #d4e6f4;
  border-radius: 999px;
  font-size: 1rem;
  outline: none;
  transition: border-color 0.2s;
}

#prompt:focus {
  border-color: var(--accent);
}

#prompt:disabled {
  background: #f0f0f0;
  cursor: not-allowed;
}

#send {
  padding: 12px 24px;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 999px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}

#send:hover:not(:disabled) {
  background: var(--accent-dark);
}

#send:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.about {
  margin-top: 24px;
  padding: 12px;
  background: #f8fafc;
  border-radius: 12px;
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--muted);
}

.about summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--fg);
}

.about a {
  color: var(--accent-dark);
}

footer {
  margin-top: auto;
  padding: 20px;
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
}

footer a {
  color: var(--accent-dark);
  margin: 0 6px;
}