/* Shared brand tokens for /chat and /book — mirrors the marketing site's look. */

:root {
  --pe-accent: #c36;
  --pe-accent-hover: #a02852;
  --pe-link: #336;
  --pe-text: #2b2b2b;
  --pe-muted: #6b7280;
  --pe-bg: #fafaf7;
  --pe-surface: #ffffff;
  --pe-surface-alt: #f3f4ed;
  --pe-border: #e5e7eb;
  --pe-success: #2f9e44;
  --pe-radius: 12px;
  --pe-radius-sm: 8px;
  --pe-shadow: 0 6px 24px rgba(0, 0, 0, 0.08);
  --pe-font: "Nunito", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --pe-max-w: 720px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: var(--pe-font);
  color: var(--pe-text);
  background: var(--pe-bg);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--pe-link); }
a:hover { color: var(--pe-accent); }

button, input, select, textarea {
  font-family: inherit;
  font-size: 1rem;
  color: inherit;
}

.pe-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 18px;
  border-radius: var(--pe-radius-sm);
  border: 1px solid var(--pe-accent);
  background: var(--pe-accent);
  color: #fff;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s, transform 0.05s;
  text-decoration: none;
}
.pe-btn:hover { background: var(--pe-accent-hover); border-color: var(--pe-accent-hover); }
.pe-btn:active { transform: translateY(1px); }
.pe-btn[disabled] { opacity: 0.5; cursor: not-allowed; }

.pe-btn--ghost {
  background: transparent;
  color: var(--pe-accent);
}
.pe-btn--ghost:hover { background: rgba(204, 51, 102, 0.08); color: var(--pe-accent); }

.pe-input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--pe-border);
  border-radius: var(--pe-radius-sm);
  background: #fff;
  outline: none;
  transition: border-color 0.15s;
}
.pe-input:focus { border-color: var(--pe-accent); }

.pe-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  background: #fff;
  border-bottom: 1px solid var(--pe-border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.pe-header__brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--pe-text);
}

.pe-header__logo {
  height: 36px;
  width: auto;
  display: block;
}

.pe-header__title {
  font-weight: 800;
  font-size: 1rem;
  letter-spacing: -0.01em;
}

.pe-lang-toggle {
  display: inline-flex;
  border: 1px solid var(--pe-border);
  border-radius: 999px;
  padding: 2px;
  background: #fff;
}
.pe-lang-toggle button {
  border: 0;
  background: transparent;
  padding: 4px 12px;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--pe-muted);
}
.pe-lang-toggle button.is-active {
  background: var(--pe-accent);
  color: #fff;
}

.pe-container {
  max-width: var(--pe-max-w);
  margin: 0 auto;
  padding: 20px;
}

@media (max-width: 600px) {
  .pe-header { padding: 12px 16px; }
  .pe-header__title { font-size: 0.9rem; }
  .pe-container { padding: 12px; }
}