/* StorageStack Kiosk — minimal, mobile-first, restraint-as-design.
   CSS variables make brand swaps a one-line change. */

:root {
  --bg: #ffffff;
  --fg: #0f172a;
  --fg-muted: #475569;
  --fg-subtle: #94a3b8;
  --line: #e2e8f0;
  --primary: #0f172a;
  --primary-fg: #ffffff;
  --secondary: #ffffff;
  --secondary-fg: #0f172a;
  --secondary-border: #0f172a;
  --accent: #2563eb;
  --radius: 14px;
  --gap: 16px;
  --pad: 24px;
  --safe-bottom: env(safe-area-inset-bottom, 16px);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", system-ui, sans-serif;
  font-size: 17px;
  line-height: 1.45;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
}

#app {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  padding: var(--pad);
  padding-bottom: calc(var(--pad) + var(--safe-bottom));
  max-width: 480px;
  margin: 0 auto;
}

/* ---------- Header ---------- */
.header { margin-bottom: 32px; }
.brand {
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg-muted);
  margin-bottom: 8px;
}
.facility-line {
  font-size: 22px;
  font-weight: 600;
  color: var(--fg);
}
.facility-loc {
  display: block;
  font-size: 14px;
  font-weight: 400;
  color: var(--fg-muted);
  margin-top: 4px;
}

/* ---------- Stepper ---------- */
.stepper {
  display: flex;
  gap: 8px;
  margin-bottom: 24px;
}
.stepper-dot {
  flex: 1;
  height: 4px;
  border-radius: 2px;
  background: var(--line);
}
.stepper-dot.is-active { background: var(--primary); }
.stepper-dot.is-done   { background: var(--primary); opacity: 0.6; }

/* ---------- Sections / Steps ---------- */
.step { display: flex; flex-direction: column; gap: var(--gap); }
.step[hidden] { display: none; }

.welcome {
  font-size: 36px;
  font-weight: 700;
  margin: 0;
  letter-spacing: -0.02em;
}
.welcome-sub {
  margin: 0 0 16px;
  font-size: 18px;
  color: var(--fg-muted);
}
.step-title {
  font-size: 26px;
  font-weight: 700;
  margin: 0 0 4px;
  letter-spacing: -0.01em;
}
.step-lead {
  margin: 0 0 8px;
  color: var(--fg-muted);
}
.footnote {
  margin: 8px 0 0;
  font-size: 13px;
  color: var(--fg-subtle);
}

/* ---------- Buttons ---------- */
.btn {
  appearance: none;
  border: 1px solid transparent;
  border-radius: var(--radius);
  padding: 18px 20px;
  font-size: 17px;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 2px;
  transition: transform 80ms ease;
  font-family: inherit;
  line-height: 1.3;
}
.btn:active { transform: scale(0.99); }
.btn-title { font-size: 18px; font-weight: 600; }
.btn-sub   { font-size: 13px; font-weight: 400; opacity: 0.8; }

.btn-primary {
  background: var(--primary);
  color: var(--primary-fg);
}
.btn-secondary {
  background: var(--secondary);
  color: var(--secondary-fg);
  border-color: var(--secondary-border);
}
.btn-link {
  background: none;
  color: var(--fg-muted);
  border: none;
  text-align: center;
  font-weight: 500;
  font-size: 15px;
  padding: 12px;
  cursor: pointer;
}

/* ---------- Lists ---------- */
.checklist {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.checklist li {
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 16px;
}
.howitworks {
  padding: 0 0 0 24px;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.howitworks li { line-height: 1.5; }

/* ---------- Size guide cards ---------- */
.size-guide {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.size-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
  text-align: left;
  cursor: pointer;
  font-family: inherit;
  background: var(--bg);
}
.size-card:active { transform: scale(0.99); }
.size-card .size {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.size-card .size-types {
  font-size: 13px;
  color: var(--fg-muted);
  margin-top: 6px;
}
.size-card[data-out-of-stock] { opacity: 0.4; cursor: default; }

/* ---------- Availability cards (step 3) ---------- */
.availability-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.avail-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  background: var(--bg);
  font-family: inherit;
  text-align: left;
}
.avail-card:active { transform: scale(0.99); }
.avail-card .avail-label { font-size: 17px; font-weight: 600; }
.avail-card .avail-cta { color: var(--accent); font-size: 14px; }

.empty-state {
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  color: var(--fg-muted);
}

/* ---------- Footer ---------- */
.footer {
  margin-top: auto;
  padding-top: 32px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  align-items: center;
}
.call-link {
  font-weight: 600;
  color: var(--fg);
  text-decoration: none;
  font-size: 16px;
}
.address-line {
  color: var(--fg-subtle);
  text-decoration: none;
  font-size: 13px;
}

/* ---------- Overlays ---------- */
.overlay {
  position: fixed;
  inset: 0;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  color: var(--fg-muted);
  z-index: 100;
}
.overlay[hidden] { display: none; }
.overlay-error { padding: var(--pad); }
.error-card {
  max-width: 360px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.error-card h2 { margin: 0; font-size: 22px; }
.error-card p  { margin: 0; color: var(--fg-muted); }