:root {
  --chat-ink: #17211b;
  --chat-muted: #68756d;
  --chat-line: #dce5dd;
  --chat-wash: #f4f8f4;
  --chat-accent: #217a52;
  --chat-accent-soft: #e2f1e8;
}

.chat-page {
  min-height: 100vh;
  background: #f7faf7;
}

.chat-content {
  display: grid;
  grid-template-columns: minmax(230px, 0.8fr) minmax(0, 2fr);
  gap: 22px;
  max-width: 1180px;
  min-height: calc(100vh - 80px);
  margin: 0 auto;
  padding: 30px 34px 54px;
}

.conversation-panel,
.message-panel {
  min-width: 0;
  border: 1px solid var(--chat-line);
  border-radius: 8px;
  background: #fff;
}

.conversation-panel {
  overflow: hidden;
}

.conversation-heading,
.message-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 22px;
  border-bottom: 1px solid var(--chat-line);
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--chat-accent);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h2 {
  margin: 0;
  color: var(--chat-ink);
  font-family: Georgia, serif;
  font-size: 1.65rem;
  font-weight: 500;
}

.conversation-count,
.thread-status {
  color: var(--chat-accent);
  font-size: 0.82rem;
  font-weight: 700;
}

.conversation-list {
  display: grid;
}

.conversation-button {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 8px;
  width: 100%;
  padding: 17px 20px;
  border: 0;
  border-bottom: 1px solid var(--chat-line);
  color: var(--chat-ink);
  background: #fff;
  cursor: pointer;
  font: inherit;
  text-align: left;
}

.conversation-button:hover,
.conversation-button.is-active {
  background: var(--chat-wash);
}

.conversation-name {
  display: block;
  overflow: hidden;
  font-weight: 700;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.conversation-unread {
  align-self: center;
  min-width: 22px;
  padding: 3px 7px;
  border-radius: 999px;
  color: #fff;
  background: var(--chat-accent);
  font-size: 0.72rem;
  text-align: center;
}

.message-panel {
  display: grid;
  grid-template-rows: auto minmax(300px, 1fr) auto;
  min-height: 600px;
}

.message-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  overflow-y: auto;
  padding: 24px;
  background: #fbfdfb;
}

.message-bubble {
  max-width: min(75%, 560px);
  padding: 12px 15px;
  border-radius: 8px;
  color: var(--chat-ink);
  background: #e8eee9;
  line-height: 1.45;
}

.message-bubble.is-mine {
  align-self: flex-end;
  color: #fff;
  background: var(--chat-accent);
}

.message-meta {
  display: block;
  margin-top: 6px;
  color: var(--chat-muted);
  font-size: 0.72rem;
}

.is-mine .message-meta {
  color: #d6f0df;
}

.message-form {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  padding: 18px;
  border-top: 1px solid var(--chat-line);
}

.message-form textarea {
  resize: vertical;
  min-height: 52px;
  padding: 12px;
  border: 1px solid var(--chat-line);
  border-radius: 6px;
  color: var(--chat-ink);
  font: inherit;
}

.message-form button {
  align-self: end;
  min-height: 44px;
  padding: 0 22px;
  border: 0;
  border-radius: 6px;
  color: #fff;
  background: var(--chat-accent);
  cursor: pointer;
  font-weight: 700;
}

.message-form button:disabled,
.message-form textarea:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

.chat-state {
  padding: 28px 20px;
  color: var(--chat-muted);
  text-align: center;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 800px) {
  .chat-content {
    grid-template-columns: 1fr;
    padding: 20px 16px 40px;
  }

  .message-panel {
    min-height: 520px;
  }

  .message-bubble {
    max-width: 88%;
  }
}