:root {
  --bg: #0b1c18;
  --bg2: #12352c;
  --ink: #e7f3ee;
  --muted: #9bb5ab;
  --accent: #3ecf8e;
  --accent-ink: #062218;
  --danger: #ff8f8f;
  --card: rgba(255, 255, 255, 0.06);
  --line: rgba(255, 255, 255, 0.12);
  --font: "Segoe UI", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(ellipse 70% 45% at 0% 0%, #1a5c45, transparent 55%),
    radial-gradient(ellipse 50% 35% at 100% 0%, #0e3a55, transparent 50%),
    linear-gradient(165deg, var(--bg), var(--bg2));
}

.hidden { display: none !important; }
.auth-body {
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: 1.25rem;
}
.auth-card, .topbar, main, .tabs { width: min(460px, 100%); }
.auth-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 1.5rem;
  backdrop-filter: blur(10px);
}
.brand {
  margin: 0;
  color: var(--accent);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-weight: 700;
}
h1, h2, h3 { margin: 0.35rem 0 0.75rem; }
.lede, .muted { color: var(--muted); }
.small { font-size: 0.85rem; }
.stack { display: grid; gap: 0.75rem; }
.row { display: grid; grid-template-columns: 1fr auto; gap: 0.5rem; }
label { display: grid; gap: 0.35rem; color: var(--muted); font-size: 0.9rem; }
input, textarea, select, button {
  font: inherit;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.28);
  color: var(--ink);
  padding: 0.75rem 0.9rem;
}
button {
  background: var(--accent);
  color: var(--accent-ink);
  border: none;
  font-weight: 650;
  cursor: pointer;
}
button.ghost, button.linkish {
  background: transparent;
  color: var(--muted);
}
button.ghost { border: 1px solid var(--line); }
button.linkish { border: none; text-decoration: underline; padding-left: 0; }
.error { color: var(--danger); }

body:not(.auth-body) {
  padding: 0.75rem 0.75rem 5.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}
.list { display: grid; gap: 0.55rem; }
.list article {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0.85rem 1rem;
}
.list article strong { display: block; }
.list article span { color: var(--muted); font-size: 0.85rem; }

.tabs {
  position: fixed;
  left: 50%;
  bottom: 0.75rem;
  transform: translateX(-50%);
  display: grid;
  grid-auto-flow: column;
  gap: 0.35rem;
  padding: 0.4rem;
  background: rgba(8, 20, 16, 0.92);
  border: 1px solid var(--line);
  border-radius: 16px;
}
.tabs button {
  background: transparent;
  color: var(--muted);
  padding: 0.65rem 0.45rem;
  font-size: 0.78rem;
}
.tabs button.active {
  background: var(--accent);
  color: var(--accent-ink);
}

.chat {
  min-height: 220px;
  max-height: 45dvh;
  overflow: auto;
  display: grid;
  gap: 0.5rem;
  margin: 0.75rem 0;
}
.bubble {
  padding: 0.7rem 0.85rem;
  border-radius: 14px;
  background: var(--card);
  border: 1px solid var(--line);
  white-space: pre-wrap;
}
.bubble.me {
  background: rgba(62, 207, 142, 0.15);
  border-color: rgba(62, 207, 142, 0.35);
}
.code {
  background: rgba(0,0,0,0.35);
  border-radius: 12px;
  padding: 0.75rem;
  overflow: auto;
  font-size: 0.8rem;
}