:root {
  --bg: #0f172a;
  --panel: #111827;
  --muted: #6b7280;
  --text: #e5e7eb;
  --accent: #22d3ee;
  --ring: rgba(34, 211, 238, 0.35);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

/* Header/Footer */
.app-header, .app-footer {
  padding: 12px 16px;
  background: linear-gradient(180deg, #0b1220, #0b1220d0);
  border-bottom: 1px solid #1f2937;
}
.app-footer { border-top: 1px solid #1f2937; }
.app-header h1 { margin: 0; font-size: 22px; letter-spacing: 0.5px; }
.tagline { margin: 4px 0 0; color: var(--muted); font-size: 12px; }
#status-text { color: var(--muted); font-size: 12px; }

/* Main column centered */
main.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 24px 16px;
  box-sizing: border-box;
}

/* Steps */
.step {
  display: none;
  width: 100%;
  max-width: 720px;
  margin: 24px auto;
}
.step.active { display: block; }

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0);
  border: 0;
}

/* Controls */
.control { display: grid; gap: 6px; margin: 12px 0; }
.control label { font-size: 12px; color: var(--muted); }
select, input, button {
  background: #0b1220;
  color: var(--text);
  border: 1px solid #253041;
  border-radius: 12px;
  padding: 12px 14px;
  font-size: 16px;
  outline: none;
}
select:focus, input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--ring);
}

/* Step nav */
.step-nav {
  display: flex;
  gap: 12px;
  justify-content: flex-end;
  align-items: center;
  margin-top: 24px;
}
.step-nav .back-btn,
.step-nav .next-btn {
  padding: 12px 16px;
  min-height: 44px;
  border-radius: 12px;
  border: 1px solid #253041;
  background: #0b1220;
  color: #e5e7eb;
  font-size: 16px;
  font-weight: 600;
}
.step-nav .back-btn:hover,
.step-nav .next-btn:hover { border-color: var(--accent); }
button[disabled]{ opacity:.55; cursor:not-allowed; }

/* Viewer */
.viewer {
  background: #0b1220;
  border: 1px solid #1f2937;
  border-radius: 14px;
  padding: 10px;
  display: grid;
  grid-template-rows: 1fr auto;
  min-height: 0;
}
#image-wrapper {
  overflow: auto;
  width: 100%;
  height: 70vh;      /* big, centered viewport */
  display: grid;
  align-items: start;
  justify-items: center;
}
#image {
  width: 100%;
  height: auto;
  max-width: none;
  max-height: none;
  border-radius: 8px;
  image-rendering: auto;
  touch-action: none; user-select: none; -webkit-user-drag: none;
}

/* Buttons row under viewer */
.control.buttons { display: flex; gap: 8px; justify-content: flex-end; }

/* Mobile */
@media (max-width: 900px) {
  .step { margin: 12px auto; }
}
/* === HARD CENTER (grid) — last lines win === */

/* Neutralize older container rules that might fight centering */
main.container {
  max-width: none !important;
  width: auto !important;
  margin: 0 !important;
}

/* Put the whole page in a 3-column grid:
   [ gutter | centered column | gutter ]  */
body {
  margin: 0 !important;
  display: grid !important;
  grid-template-columns: 1fr min(1100px, 100%) 1fr !important;
}

/* Force header, main, footer into the centered column */
body > header.app-header,
body > main.container,
body > footer.app-footer {
  grid-column: 2 !important;
  width: 100% !important;
  box-sizing: border-box !important;
  padding-left: 24px !important;
  padding-right: 24px !important;
}

/* Keep each step panel centered within that column */
.step {
  max-width: 720px !important;
  width: 100% !important;
  margin: 24px auto !important;
}
.page {
  max-width: 1100px;
  width: 100%;
  margin: 0 auto;
  padding: 0 24px;
  box-sizing: border-box;
}

.step {
  max-width: 720px;
  width: 100%;
  margin: 24px auto;
}

/* Optional visual guide to confirm centering */
.page {
  outline: 2px dashed rgba(34,211,238,.35);
  outline-offset: 0;
}
/* === SINGLE CENTER COLUMN (final) === */
:root { --page-pad: 24px; --page-max: 1100px; }

body > .page {
  width: min(var(--page-max), 100% - (2 * var(--page-pad)));
  margin-inline: auto;          /* centers header+main+footer as a unit */
  padding-inline: var(--page-pad);
  box-sizing: border-box;
}

.step { max-width: 720px; width: 100%; margin: 24px auto; }
#image-wrapper {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 8px;
}

#image {
  max-width: 90vw;
  max-height: 75vh;
  width: auto;
  height: auto;
  object-fit: contain;
  display: block;
}
/* kill accidental page grid so content centers inside .container */
body { 
  display: block !important; 
  margin: 0;
}