/* ============================================================
   ConciergeFlow AI — app.css
   The shell: header, step navigation, app-root layout, responsive.
   ============================================================ */

/* ---- Header --------------------------------------------- */

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
  padding: var(--sp-3) var(--sp-5);
  background: var(--offwhite);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 100;
}

.app-header__brand {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  color: var(--charcoal);
}
.app-header__brand:hover { color: var(--charcoal); }

.app-header__logo {
  height: 26px;
  width: auto;
  display: block;
}

.app-header__divider {
  width: 1px;
  height: 24px;
  background: var(--line);
}

.app-header__product {
  font-family: var(--athera-display);
  font-size: 23px;
  font-weight: 400;
  letter-spacing: -0.01em;
  color: var(--charcoal);
  white-space: nowrap;
}

/* ---- Step navigation ------------------------------------ */

.step-nav {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
  flex-wrap: wrap;
  justify-content: flex-end;
}

.step-nav__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 14px;
  border-radius: 999px;
  font-family: var(--athera-sans);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--grey);
  border: 1px solid transparent;
  transition: color 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}
.step-nav__link:hover { color: var(--charcoal); }

.step-nav__num {
  font-family: var(--athera-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0;
  color: var(--grey-light);
}

.step-nav__link.is-active {
  color: var(--blue-deep);
  background: rgba(95, 184, 214, 0.1);
  border-color: rgba(95, 184, 214, 0.28);
}
.step-nav__link.is-active .step-nav__num { color: var(--athera-blue); }

.step-nav__link.is-done { color: var(--charcoal-light); }
.step-nav__link.is-done .step-nav__num { color: var(--grey); }

/* ---- App root ------------------------------------------- */

#app-root {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: var(--sp-6) var(--sp-5) var(--sp-8);
}

.screen {
  animation: athera-fade-in 0.3s ease;
}
@keyframes athera-fade-in {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---- Shared section eyebrow / intro helpers ------------- */

.screen__eyebrow {
  display: block;
  margin-bottom: var(--sp-2);
}

.screen__intro {
  max-width: 560px;
  font-size: 18px;
  font-weight: 300;
  line-height: 1.7;
  color: var(--charcoal-light);
}

.blue-rule {
  width: 48px;
  height: 1px;
  background: var(--athera-blue);
  border: none;
  margin: var(--sp-3) 0;
}

/* ============================================================
   Responsive — header collapses gracefully ~860px
   ============================================================ */

@media (max-width: 860px) {
  .app-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--sp-2);
    padding: var(--sp-3) var(--sp-3);
  }

  .step-nav {
    justify-content: flex-start;
    width: 100%;
    gap: 6px;
  }

  .step-nav__link {
    padding: 6px 11px;
    font-size: 11px;
  }

  #app-root {
    padding: var(--sp-5) var(--sp-3) var(--sp-7);
  }
}

@media (max-width: 560px) {
  .app-header__product { font-size: 20px; }
  .app-header__logo { height: 22px; }

  .step-nav__link .step-nav__label { display: none; }
  .step-nav__link { padding: 7px 10px; }
  .step-nav__link.is-active .step-nav__label { display: inline; }
}