:root {
  color-scheme: light;
  --bg: #f3efe7;
  --card: #fffdf8;
  --ink: #1d262b;
  --muted: #69767f;
  --line: #d8d0c3;
  --brand: #0d7a64;
  --brand-strong: #075a4a;
  --accent: #ffe3a0;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top left, #fff4cf, transparent 32%),
    linear-gradient(180deg, #f6f2ea 0%, #ebe4d7 100%);
  color: var(--ink);
}

.app-shell {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px;
  display: grid;
  gap: 24px;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 20px;
  box-shadow: 0 18px 40px rgba(29, 38, 43, 0.08);
}

.auth-card {
  display: grid;
  gap: 12px;
}

.chat-card {
  display: grid;
  gap: 16px;
}

h1 {
  margin: 0;
  font-size: 30px;
}

.muted {
  margin: 0;
  color: var(--muted);
}

label {
  display: grid;
  gap: 6px;
  font-size: 14px;
  color: var(--muted);
}

input,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 12px 14px;
  font: inherit;
  background: #fff;
}

button {
  border: 0;
  border-radius: 14px;
  padding: 12px 16px;
  background: var(--brand);
  color: #fff;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

button:hover {
  background: var(--brand-strong);
}

.debug-box,
.status-box {
  padding: 12px 14px;
  border-radius: 14px;
  background: #f8f4ec;
  border: 1px solid var(--line);
}

.status-box {
  white-space: pre-wrap;
  min-height: 80px;
}

.chat-controls {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  align-items: end;
}

.layout {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 16px;
}

.chat-list-panel,
.messages-panel {
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 14px;
  background: #fffdf9;
  min-height: 420px;
}

.panel-title {
  font-weight: 700;
  margin-bottom: 12px;
}

.chat-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.chat-item {
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 14px;
  cursor: pointer;
  background: #fff;
}

.chat-item.active {
  border-color: var(--brand);
  background: #effaf7;
}

.message-list {
  min-height: 280px;
  display: grid;
  gap: 10px;
  align-content: start;
}

.message {
  max-width: 75%;
  padding: 10px 12px;
  border-radius: 16px;
  background: #f2f0ea;
}

.message.own {
  justify-self: end;
  background: var(--accent);
}

.composer {
  margin-top: 16px;
  display: grid;
  gap: 10px;
}

@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
  }

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