/* design.css — single shared design system. all products import this unchanged. */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #0a0a0c;
  --surface: #141418;
  --border: #1e1e24;
  --text: #e8e6e3;
  --text-dim: #8a8a8e;
  --accent: #6e56cf;
  --accent-glow: #7c66dc;
  --user: #1a1a22;
  --ai: #12121a;
  --error: #e54d2e;
  --radius: 12px;
  --max-w: 680px;
}

html, body {
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

body {
  display: flex;
  flex-direction: column;
}

/* hero */
[data-region="hero"] {
  text-align: center;
  padding: 3rem 1.5rem 2rem;
}

[data-region="hero"] h1 {
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

[data-region="hero"] p {
  color: var(--text-dim);
  margin-top: 0.25rem;
  font-size: 0.95rem;
}

/* conversation */
[data-region="conversation"] {
  flex: 1;
  display: flex;
  flex-direction: column;
  max-width: var(--max-w);
  width: 100%;
  margin: 0 auto;
  padding: 0 1rem;
  min-height: 0;
}

[data-region="messages"] {
  flex: 1;
  overflow-y: auto;
  padding: 1rem 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

/* message bubbles */
[data-role="user"], [data-role="ai"] {
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  max-width: 85%;
  word-wrap: break-word;
  position: relative;
}

[data-role="user"] {
  background: var(--user);
  border: 1px solid var(--border);
  align-self: flex-end;
}

[data-role="ai"] {
  background: var(--ai);
  border: 1px solid var(--border);
  align-self: flex-start;
}

[data-role="ai"][data-error] {
  border-color: var(--error);
  color: var(--error);
}

/* speak button on ai messages */
[data-action="speak"] {
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 0.8rem;
  padding: 0.25rem 0;
  margin-top: 0.5rem;
  display: block;
}

[data-action="speak"]::before { content: "listen"; }
[data-action="speak"]:hover { color: var(--accent-glow); }

/* input form */
[data-region="input"] {
  display: flex;
  gap: 0.5rem;
  padding: 1rem 0 1.5rem;
  border-top: 1px solid var(--border);
}

[data-input="message"] {
  flex: 1;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  color: var(--text);
  font-size: 1rem;
  font-family: inherit;
  outline: none;
  transition: border-color 0.15s;
}

[data-input="message"]:focus {
  border-color: var(--accent);
}

[data-input="message"]::placeholder {
  color: var(--text-dim);
}

[data-action="send"], [data-action="mic"] {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-dim);
  cursor: pointer;
  width: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  transition: border-color 0.15s, color 0.15s;
}

[data-action="send"]::before { content: "\2191"; }
[data-action="mic"]::before { content: "\25CF"; }

[data-action="send"]:hover, [data-action="mic"]:hover {
  border-color: var(--accent);
  color: var(--accent-glow);
}

[data-action="mic"].listening {
  color: var(--error);
  border-color: var(--error);
}

/* footer */
[data-region="footer"] {
  text-align: center;
  padding: 1rem;
  color: var(--text-dim);
  font-size: 0.75rem;
}

/* scrollbar */
[data-region="messages"]::-webkit-scrollbar { width: 4px; }
[data-region="messages"]::-webkit-scrollbar-track { background: transparent; }
[data-region="messages"]::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

/* mobile */
@media (max-width: 480px) {
  [data-region="hero"] { padding: 2rem 1rem 1.5rem; }
  [data-region="hero"] h1 { font-size: 1.4rem; }
  [data-role="user"], [data-role="ai"] { max-width: 92%; }
}