:root {
  --bg: #05070d;
  --card: #10141f;
  --border: #1e2433;
  --text: #eef1f8;
  --text-dim: #9aa3b5;
  --bubble-them: #1a2030;
  --bubble-us: linear-gradient(120deg, #6ee7ff, #7c6bff);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  flex-wrap: wrap;
  padding: 40px 20px;
}

.phone {
  width: 380px;
  height: 640px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 32px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}

.phone-header {
  padding: 20px;
  border-bottom: 1px solid var(--border);
  text-align: center;
}
.business-name { font-weight: 700; font-size: 16px; }
.subtitle { font-size: 12px; color: var(--text-dim); margin-top: 4px; }

.chat {
  flex: 1;
  padding: 16px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.system-note {
  text-align: center;
  font-size: 12px;
  color: var(--text-dim);
  margin-bottom: 8px;
}

.bubble {
  max-width: 78%;
  padding: 10px 14px;
  border-radius: 16px;
  font-size: 14.5px;
  line-height: 1.4;
}
.bubble.them {
  align-self: flex-start;
  background: var(--bubble-them);
  border-bottom-left-radius: 4px;
}
.bubble.us {
  align-self: flex-end;
  background: var(--bubble-us);
  color: #04060b;
  border-bottom-right-radius: 4px;
}
.bubble.typing {
  align-self: flex-start;
  background: var(--bubble-them);
  color: var(--text-dim);
  font-style: italic;
}

.chat-form {
  display: flex;
  gap: 8px;
  padding: 14px;
  border-top: 1px solid var(--border);
}
.chat-form input {
  flex: 1;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  outline: none;
}
.chat-form input:focus { border-color: #6ee7ff; }
.chat-form button {
  padding: 12px 18px;
  border-radius: 10px;
  border: none;
  background: var(--bubble-us);
  color: #04060b;
  font-weight: 700;
  cursor: pointer;
}
.chat-form button:disabled { opacity: 0.5; cursor: default; }

.sidebar {
  width: 300px;
}
.sidebar h2 { margin-top: 0; }
.sidebar p { color: var(--text-dim); line-height: 1.6; font-size: 14.5px; }
.sidebar button {
  margin-top: 16px;
  padding: 10px 16px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  cursor: pointer;
  font-size: 14px;
}
.sidebar button:hover { border-color: #6ee7ff; }