/* ============================================================
   BRAND PALETTE
   Bitcoin Orange  #F7931A  — Primary accent. CTAs, icons, highlights.
   Obsidian        #1A1A1A  — Headings, body text, authority elements.
   Deep Navy       #1D3557  — Secondary accent, trust signals, canvas.
   Slate           #4A4A4A  — Body copy, secondary text, descriptions.
   Cloud           #F5F5F5  — Page backgrounds, card fills, quiet surfaces.
   White           #FFFFFF  — Primary page background.
   ============================================================ */

/* ============================================================
   BASE RESET
   ============================================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: Arial, Helvetica, sans-serif;
  background: #1D3557;
  color: #1A1A1A;
}

/* ============================================================
   LANDING PAGE
   Deep Navy canvas with a centred white card.
   ============================================================ */
#landing {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
}

.landing-card {
  max-width: 680px;
  width: 100%;
  background: #FFFFFF;
  border-radius: 8px;
  padding: 2.5rem 2.5rem 2rem;
  box-shadow: 0 4px 32px rgba(0, 0, 0, 0.4);
}

.landing-header {
  text-align: center;
  margin-bottom: 1.5rem;
  border-bottom: 2px solid #F7931A;
  padding-bottom: 1.25rem;
}

.landing-header .bitcoin-symbol {
  font-size: 2.5rem;
  color: #F7931A;
  line-height: 1;
  display: block;
  margin-bottom: 0.5rem;
}

.landing-header h1 {
  font-size: 1.6rem;
  font-weight: 700;
  color: #1A1A1A;
  margin-bottom: 0.3rem;
}

.landing-header .tagline {
  font-size: 0.95rem;
  font-weight: 700;
  color: #1D3557;
  margin-bottom: 0.35rem;
  letter-spacing: 0.01em;
}

.landing-header p {
  font-size: 0.9rem;
  color: #4A4A4A;
}

.section-title {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #F7931A;
  margin-bottom: 0.6rem;
  margin-top: 1.25rem;
}

.explainer p {
  font-size: 0.92rem;
  line-height: 1.6;
  color: #4A4A4A;
}

/* Step-by-step how-to list */
.steps {
  list-style: none;
  margin-top: 0.25rem;
}

.steps li {
  display: flex;
  gap: 0.75rem;
  font-size: 0.88rem;
  color: #4A4A4A;
  line-height: 1.6;
  margin-bottom: 0.6rem;
}

.steps li .step-num {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  background: #F7931A;
  color: #FFFFFF;
  font-weight: 700;
  font-size: 0.75rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 1px;
}

/* Security warnings box */
.warnings {
  background: #F5F5F5;
  border: 1px solid #F7931A;
  border-radius: 6px;
  padding: 0.9rem 1rem;
  margin-top: 0.25rem;
}

.warnings ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.warnings ul li {
  font-size: 0.85rem;
  color: #1D3557;
  line-height: 1.45;
  padding-left: 1.3em;
  position: relative;
}

.warnings ul li::before {
  content: "⚠";
  position: absolute;
  left: 0;
  font-size: 0.75rem;
  color: #F7931A;
}

/* Generate button */
.generate-section {
  margin-top: 1.5rem;
}

#btn-generate {
  width: 100%;
  padding: 0.9rem 2rem;
  font-size: 1.05rem;
  font-weight: 700;
  font-family: Arial, Helvetica, sans-serif;
  background: #F7931A;
  color: #FFFFFF;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  letter-spacing: 0.02em;
  transition: background 0.15s;
}

#btn-generate:hover {
  background: #d4780a;
}

.generate-note {
  margin-top: 0.6rem;
  text-align: center;
  font-size: 0.78rem;
  color: #4A4A4A;
  font-family: "Courier New", Courier, monospace;
}

/* ============================================================
   TIP SECTION
   ============================================================ */
.tip-section {
  margin-top: 1.5rem;
  border-top: 1px solid #F5F5F5;
  padding-top: 1.25rem;
  text-align: center;
}

.tip-text {
  font-size: 0.85rem;
  color: #4A4A4A;
  margin-top: 0.25rem;
}

.tip-qr-wrap {
  display: inline-block;
  margin: 0.75rem auto 0.4rem;
  border: 3px solid #F7931A;
  border-radius: 6px;
  overflow: hidden;
  line-height: 0;
}

.tip-address {
  font-size: 0.8rem;
  font-family: "Courier New", Courier, monospace;
  color: #4A4A4A;
  margin-top: 0.3rem;
}

.github-link {
  margin-top: 1rem;
  text-align: center;
  font-size: 0.8rem;
}

.github-link a {
  color: #1D3557;
  text-decoration: none;
}

.github-link a:hover {
  text-decoration: underline;
}

/* ============================================================
   APP VIEW (shown after generation)
   Deep Navy canvas with A4 pages floating on it.
   ============================================================ */
#app {
  display: none;
  background: #1D3557;
  min-height: 100vh;
  overflow-x: auto;
}

/* Fixed top controls bar — hidden when printing */
#screen-controls {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background: #1A1A1A;
  color: #FFFFFF;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.65rem 1.5rem;
  gap: 1rem;
  border-bottom: 2px solid #F7931A;
}

#screen-controls .brand {
  font-weight: 700;
  color: #F7931A;
  font-size: 0.95rem;
  white-space: nowrap;
}

#screen-controls .controls-right {
  display: flex;
  gap: 0.6rem;
}

.ctrl-btn {
  padding: 0.45rem 1rem;
  font-size: 0.85rem;
  font-weight: 700;
  font-family: Arial, Helvetica, sans-serif;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  transition: background 0.15s;
}

#btn-print {
  background: #F7931A;
  color: #FFFFFF;
}
#btn-print:hover { background: #d4780a; }

#btn-regenerate {
  background: #1A1A1A;
  color: #F5F5F5;
  border: 1px solid #4A4A4A;
}
#btn-regenerate:hover { background: #4A4A4A; color: #FFFFFF; }

/* Pages scrolling area */
#pages-area {
  padding: 4.5rem 1rem 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

/* ============================================================
   PRINT PAGES
   On screen: white A4 "paper" floating on the Deep Navy canvas.
   On print:  each .print-page is one page, decorations stripped.
   ============================================================ */
.print-page {
  width: 210mm;
  background: #FFFFFF;
  box-shadow: 0 2px 16px rgba(0, 0, 0, 0.4);
}

.page-inner {
  padding: 8mm 10mm;
  font-family: Arial, Helvetica, sans-serif;
}

/* Page header (logo line + title) */
.page-header {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  border-bottom: 1.5px solid #F7931A;
  padding-bottom: 2mm;
  margin-bottom: 3mm;
}

.page-header .page-logo {
  font-size: 10pt;
  font-weight: 700;
  color: #F7931A;
}

.page-header .page-title {
  font-size: 8pt;
  font-weight: 700;
  color: #1A1A1A;
  flex: 1;
}

.page-header .page-subtitle {
  font-size: 6.5pt;
  color: #4A4A4A;
  white-space: nowrap;
}

/* ============================================================
   INSTRUCTIONS PAGE (Page 1)
   ============================================================ */
.instr-body {
  font-family: Arial, Helvetica, sans-serif;
  font-size: 8pt;
  color: #1A1A1A;
  line-height: 1.6;
}

.instr-section {
  margin-bottom: 5mm;
}

.instr-heading {
  font-size: 7.5pt;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #F7931A;
  border-bottom: 1px solid #F7931A;
  padding-bottom: 1mm;
  margin-bottom: 2mm;
}

.instr-section p {
  font-size: 7.5pt;
  line-height: 1.6;
}

.instr-steps {
  width: 100%;
  border-collapse: collapse;
}

.instr-steps td {
  font-size: 7.5pt;
  vertical-align: top;
  padding: 1.5mm 0;
  border-bottom: 1px dotted #F5F5F5;
  line-height: 1.45;
}

.instr-num {
  width: 6mm;
  font-weight: 700;
  color: #F7931A;
  padding-right: 2mm !important;
  white-space: nowrap;
}

.instr-pages {
  width: 100%;
  border-collapse: collapse;
}

.instr-pages td {
  font-size: 7.5pt;
  padding: 1mm 0;
  border-bottom: 1px dotted #F5F5F5;
  vertical-align: top;
  line-height: 1.4;
}

.instr-pg {
  width: 18mm;
  font-weight: 700;
  color: #4A4A4A;
  white-space: nowrap;
}

.instr-warning-box {
  background: #F5F5F5;
  border: 1px solid #F7931A;
  border-radius: 3px;
  padding: 2mm 3mm;
}

.instr-warns {
  width: 100%;
  border-collapse: collapse;
}

.instr-warns td {
  font-size: 7.5pt;
  padding: 1mm 0;
  vertical-align: top;
  line-height: 1.4;
}

.instr-warn-icon {
  width: 5mm;
  color: #F7931A;
  font-size: 8pt;
}

/* ============================================================
   RECORD SHEET (Page 2)
   8-column card grid — one card per seed word slot.
   ============================================================ */
.record-grid {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 2mm;
  margin-top: 3mm;
}

.record-card {
  border: 1px solid #F5F5F5;
  border-radius: 1.5mm;
  padding: 1.5mm 2mm 2mm;
  height: 19mm;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-sizing: border-box;
}

.record-num {
  font-family: "Courier New", Courier, monospace;
  font-size: 7pt;
  font-weight: 700;
  color: #F7931A;
  line-height: 1;
}

.record-line {
  border-bottom: 1px solid #4A4A4A;
  width: 100%;
  padding-bottom: 0.5mm;
}

/* ============================================================
   SEED SHEET TABLE (Page 3)
   79 rows × 26 columns — first 4 chars of each word.
   ============================================================ */
.seed-table {
  border-collapse: collapse;
  width: 100%;
}

.seed-table th,
.seed-table td {
  font-family: "Courier New", Courier, monospace;
  font-size: 6.5pt;
  text-align: center;
  padding: 0;
  width: 24px;
}

.seed-table th {
  font-weight: 700;
  height: 14px;
  border-bottom: 1.5px solid #4A4A4A;
  background: #F5F5F5;
}

.seed-table td {
  height: 11px;
}

.seed-table .row-label {
  font-weight: 700;
  text-align: right;
  padding-right: 3px;
  color: #4A4A4A;
  width: 18px;
  font-size: 6pt;
}

/* ============================================================
   LOOKUP TABLE (Pages 4 and 5)
   Alphabetically sorted: word abbreviation → grid coordinate.
   ============================================================ */
.lookup-table {
  border-collapse: collapse;
  width: 100%;
}

.lookup-table td {
  font-family: "Courier New", Courier, monospace;
  font-size: 6.5pt;
  text-align: left;
  padding: 0 3px;
  height: 11px;
  /* width is set per-column by JS so cells divide the page evenly */
  white-space: nowrap;
  overflow: hidden;
}


/* ============================================================
   ALTERNATING ROW COLOURS (shared by all tables)
   ============================================================ */
.row-even { background: #F5F5F5; }
.row-odd  { background: #FFFFFF; }

/* ============================================================
   PRINT MEDIA STYLES
   On print: hide UI chrome, show only pages, one page per sheet.
   ============================================================ */
@media print {
  body { background: white; }

  #landing,
  #screen-controls { display: none !important; }

  #app { display: block !important; }

  #pages-area {
    padding: 0;
    gap: 0;
    display: block;
  }

  .print-page {
    width: 100%;
    box-shadow: none;
    page-break-after: always;
    break-after: page;
  }

  /* Force browsers to print background colours (e.g. alternating row tints) */
  .row-even,
  .row-odd,
  .seed-table th,
  .instr-warning-box {
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }

  .print-page:last-child {
    page-break-after: avoid;
    break-after: avoid;
  }
}

@page {
  size: A4 portrait;
  margin: 0;
}

/* When the viewport is narrower than an A4 page:
   - left-align pages so the user can scroll right
   - wrap the header to two rows: brand on top, buttons below
   - reduce landing card padding */
@media (max-width: 900px) {
  .landing-card {
    padding: 12px;
  }

  #screen-controls {
    flex-wrap: wrap;
    padding: 0.5rem 0.75rem;
    gap: 0.4rem;
  }

  #screen-controls .brand {
    flex: 1 1 100%;
    white-space: normal;
  }

  #screen-controls .controls-right {
    flex: 1 1 100%;
  }

  #screen-controls .ctrl-btn {
    flex: 1;
  }

  #pages-area {
    align-items: flex-start;
    padding-top: 6rem; /* extra clearance for the taller two-row header */
  }
}