/* Platform surfaces — builds on the SDK tokens (sdk.css loads first). */

.pf-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 0;
}

.pf-logo {
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
  color: var(--iq-ink);
  text-decoration: none;
}
.pf-logo span { color: var(--iq-accent); }

.pf-nav-links { display: flex; gap: 1rem; align-items: center; }
.pf-nav-links a { color: var(--iq-ink-soft); text-decoration: none; font-weight: 650; }
.pf-nav-links a:hover { color: var(--iq-accent); }

.pf-hero { padding: 2.5rem 0 1rem; display: flex; flex-direction: column; gap: 0.7rem; }
.pf-hero h1 {
  margin: 0;
  font-size: clamp(1.9rem, 5vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  text-wrap: balance;
}
.pf-hero p { margin: 0; color: var(--iq-ink-soft); font-size: 1.1rem; max-width: 46ch; }

.pf-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 0.9rem;
}

.pf-app-card {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  background: var(--iq-surface);
  border: 1px solid var(--iq-line);
  border-radius: var(--iq-radius);
  box-shadow: var(--iq-shadow);
  padding: 1.1rem;
  text-decoration: none;
  color: var(--iq-ink);
  transition: transform 0.08s ease, border-color 0.15s ease;
}
.pf-app-card:hover { transform: translateY(-2px); border-color: var(--iq-accent); }
.pf-app-icon { font-size: 1.9rem; line-height: 1; }
.pf-app-name { font-weight: 750; }
.pf-app-sub { color: var(--iq-ink-faint); font-size: 0.85rem; }

.pf-wide { max-width: 1100px; }

/* Builder layout */
.pf-builder {
  display: grid;
  grid-template-columns: minmax(320px, 420px) 1fr;
  gap: 1rem;
  align-items: start;
  min-height: 70vh;
}
@media (max-width: 900px) { .pf-builder { grid-template-columns: 1fr; } }

.pf-chat {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  background: var(--iq-surface);
  border: 1px solid var(--iq-line);
  border-radius: var(--iq-radius);
  padding: 1rem;
  max-height: 78vh;
}
.pf-chat-log { overflow-y: auto; display: flex; flex-direction: column; gap: 0.6rem; flex: 1; min-height: 200px; }
.pf-msg { padding: 0.55rem 0.8rem; border-radius: var(--iq-radius-sm); max-width: 92%; }
.pf-msg-user { background: var(--iq-accent-soft); align-self: flex-end; }
.pf-msg-ai { background: var(--iq-bg); border: 1px solid var(--iq-line); align-self: flex-start; }
.pf-msg-err { border: 1px solid var(--iq-danger); color: var(--iq-danger); align-self: flex-start; }

.pf-chat-input { display: flex; gap: 0.5rem; }
.pf-chat-input textarea {
  flex: 1; font: inherit; resize: vertical; min-height: 3.2rem;
  background: var(--iq-bg); color: var(--iq-ink);
  border: 1px solid var(--iq-line); border-radius: var(--iq-radius-sm); padding: 0.55rem 0.8rem;
}

.pf-preview {
  border: 1px solid var(--iq-line);
  border-radius: var(--iq-radius);
  overflow: hidden;
  background: var(--iq-surface);
  box-shadow: var(--iq-shadow);
  display: flex;
  flex-direction: column;
  min-height: 70vh;
}
.pf-preview-bar {
  display: flex; align-items: center; justify-content: space-between; gap: 0.6rem;
  padding: 0.45rem 0.8rem; border-bottom: 1px solid var(--iq-line);
  font-size: 0.85rem; color: var(--iq-ink-faint);
}
.pf-preview iframe { border: 0; width: 100%; flex: 1; background: #fff; }

.pf-versions { display: flex; flex-direction: column; gap: 0.4rem; }
.pf-version { display: flex; align-items: center; gap: 0.6rem; font-size: 0.9rem; }
.pf-version .n { font-variant-numeric: tabular-nums; color: var(--iq-ink-faint); width: 2.2rem; }

.pf-center { max-width: 420px; margin: 8vh auto 0; display: flex; flex-direction: column; gap: 1rem; }
.pf-code-input { letter-spacing: 0.5em; font-size: 1.4rem; text-align: center; font-variant-numeric: tabular-nums; }
.pf-footer { margin-top: 3rem; color: var(--iq-ink-faint); font-size: 0.85rem; text-align: center; }