:root {
  --green: #10a37f;
  --rose: #e5497c;
  --ink: #1a1a1a;
  --muted: #6b7280;
  --bg: #ffffff;
  --bubble: #f4f4f5;
  --line: #e5e7eb;
  --radius: 14px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, sans-serif;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 18px;
  line-height: 1.55;
  color: var(--ink);
  background: var(--bg);
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
}

.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
.skip { position: absolute; left: -9999px; }
.skip:focus { left: 8px; top: 8px; z-index: 99; background: #fff; padding: 8px 12px; border-radius: 8px; }

/* Top bar */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 10;
}
.brand { display: flex; align-items: center; gap: 10px; }
.mark { width: 32px; height: 32px; }
.mark.big { width: 56px; height: 56px; }
.brand-name { font-weight: 700; font-size: 20px; letter-spacing: -0.01em; }

/* Visible mode cards — audience sees both modes at a glance */
.mode-cards {
  display: flex; gap: 10px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  background: var(--bg);
  position: sticky; top: 65px; z-index: 9;
}
.mode-card {
  flex: 1; display: flex; flex-direction: column; align-items: flex-start; gap: 2px;
  border: 1.5px solid var(--line); background: #fff; border-radius: 14px;
  padding: 10px 14px; cursor: pointer; font-family: inherit; color: var(--ink); text-align: left;
}
.mode-card-title { font-size: 17px; font-weight: 700; }
.mode-card-desc { font-size: 13px; color: var(--muted); }
.mode-card.active { border-color: var(--green); background: #f0fdf9; }
.mode-card.active .mode-card-title { color: var(--green); }
.mode-card.play.active { border-color: var(--rose); background: #fff0f5; }
.mode-card.play.active .mode-card-title { color: var(--rose); }

/* Play controls */
.play-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--line);
  flex-wrap: wrap;
}
.personas { display: flex; gap: 8px; flex-wrap: wrap; }
.persona {
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 15px;
  cursor: pointer;
}
.persona.active { background: #fff0f5; border-color: var(--rose); color: var(--rose); font-weight: 600; }
.ghost-btn {
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 15px;
  cursor: pointer;
}

/* Chat */
.chat { flex: 1; overflow-y: auto; padding: 20px 16px 8px; }
.messages { max-width: 720px; margin: 0 auto; display: flex; flex-direction: column; gap: 14px; }
.empty { text-align: center; margin-top: 12vh; color: var(--muted); }
.empty h1 { color: var(--ink); font-size: 30px; margin: 16px 0 6px; letter-spacing: -0.02em; }
.empty .sub { margin: 0; font-size: 16px; }

.msg { display: flex; gap: 10px; align-items: flex-start; }
.msg .avatar { flex: none; width: 30px; height: 30px; margin-top: 2px; }
.msg.user { justify-content: flex-end; }
.msg .bubble {
  max-width: 85%;
  padding: 12px 16px;
  border-radius: var(--radius);
  background: var(--bubble);
  white-space: pre-wrap;
  overflow-wrap: break-word;
}
.msg.user .bubble { background: var(--green); color: #fff; }
.msg.play .bubble { background: #fff0f5; }
.msg-actions { display: flex; gap: 6px; margin-top: 6px; }
.msg-actions button {
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 8px;
  padding: 4px 10px;
  font-size: 13px;
  cursor: pointer;
  color: var(--muted);
}
.msg-actions button:hover { color: var(--ink); border-color: var(--ink); }
.typing { color: var(--muted); font-style: italic; }

/* Composer */
.composer-wrap { border-top: 1px solid var(--line); padding: 12px 16px 8px; background: var(--bg); }
.composer { max-width: 720px; margin: 0 auto; display: flex; gap: 10px; align-items: flex-end; }
.composer textarea {
  flex: 1;
  resize: none;
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 12px 18px;
  font-size: 18px;
  font-family: inherit;
  line-height: 1.4;
  max-height: 140px;
}
.composer textarea:focus { outline: 2px solid var(--green); border-color: var(--green); }
.composer button {
  flex: none;
  width: 46px; height: 46px;
  border: none; border-radius: 50%;
  background: var(--green); color: #fff;
  cursor: pointer; display: grid; place-items: center;
}
.composer button svg { width: 22px; height: 22px; }
.fine { text-align: center; font-size: 13px; color: var(--muted); margin: 8px 0 4px; }
.fine a { color: var(--muted); }

/* Modals */
.modal {
  position: fixed; inset: 0;
  background: rgba(0,0,0,.45);
  display: grid; place-items: center;
  padding: 20px; z-index: 50;
}
.modal[hidden] { display: none; }
.modal-card {
  background: #fff; border-radius: 18px;
  padding: 26px; max-width: 420px; width: 100%;
  box-shadow: 0 20px 60px rgba(0,0,0,.2);
}
.modal-card h2 { margin: 0 0 8px; font-size: 24px; }
.modal-card .muted { color: var(--muted); font-size: 15px; margin-top: 0; }
.modal-card label { display: block; margin: 12px 0; font-size: 16px; }
.modal-card input {
  display: block; width: 100%; margin-top: 6px;
  border: 1px solid var(--line); border-radius: 10px;
  padding: 10px 12px; font-size: 16px; font-family: inherit;
}
.modal-actions { display: flex; gap: 10px; margin-top: 18px; }
.primary {
  background: var(--green); color: #fff; border: none;
  border-radius: 999px; padding: 10px 22px; font-size: 16px; cursor: pointer; font-weight: 600;
}

/* Static pages */
.page { max-width: 720px; margin: 0 auto; padding: 28px 20px 60px; }
.page h1 { font-size: 32px; letter-spacing: -0.02em; }
.page h2 { font-size: 22px; margin-top: 30px; }
.page p, .page li { font-size: 18px; }
.page .faq-item { border-bottom: 1px solid var(--line); padding: 14px 0; }
.page .faq-item h2 { font-size: 20px; margin: 0 0 8px; }
.back { display: inline-block; margin-bottom: 12px; color: var(--green); }

@media (max-width: 520px) {
  body { font-size: 17px; }
  .empty h1 { font-size: 26px; }
  .msg .bubble { max-width: 92%; }
}

/* Adsterra native banner slot */
.ad-slot { display: flex; justify-content: center; padding: 10px 12px; }
.ad-slot:empty { display: none; }
.ad-slot[hidden] { display: none; }