@import url('https://fonts.googleapis.com/css2?family=Source+Serif+4:ital,opsz,wght@0,8..60,400;0,8..60,600;1,8..60,400&family=Spline+Sans+Mono:wght@400;600&family=Syne:wght@600;700&display=swap');

:root {
  --sheet: #dce6ef;
  --fill: #f4f7fa;
  --ink: #122033;
  --mute: #3d5270;
  --rule: #7a93a8;
  --stamp: #c2301c;
  --stamp-hover: #9e2616;
  --grid: rgba(18, 48, 88, 0.14);
}

* { box-sizing: border-box; }

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

html, body {
  margin: 0;
  padding: 0;
  background-color: var(--sheet);
  background-image: 
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 20px 20px;
  color: var(--ink);
  font-family: "Source Serif 4", serif;
  line-height: 1.6;
  scroll-behavior: smooth;
}

:focus-visible {
  outline: 2px solid var(--stamp);
  outline-offset: 2px;
}

h1, h2, h3, h4 {
  font-family: "Syne", sans-serif;
  color: var(--ink);
  margin-top: 0;
}

h1 {
  font-size: clamp(32px, 7vw, 64px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
  overflow-wrap: anywhere;
}

h2 {
  font-size: 28px;
  margin-top: 56px;
  margin-bottom: 20px;
  border-bottom: 2px solid var(--rule);
  padding-bottom: 8px;
}

p, li {
  font-size: 19px;
  margin-bottom: 16px;
}

a {
  color: var(--stamp);
  font-weight: 600;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 48px 24px 96px;
}

/* Drawing Title Block */
.title-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  background: var(--fill);
  border-top: 2px solid var(--ink);
  border-left: 2px solid var(--ink);
  font-family: "Spline Sans Mono", monospace;
  font-size: 13px;
  text-transform: uppercase;
  margin-bottom: 56px;
  box-shadow: 4px 4px 0 var(--grid);
}
.title-block .cell {
  padding: 12px 16px;
  border-right: 2px solid var(--ink);
  border-bottom: 2px solid var(--ink);
  display: flex;
  align-items: baseline;
}
.title-block .cell.full {
  grid-column: 1 / -1;
}
.title-block .label {
  color: var(--mute);
  margin-right: 12px;
  font-weight: 600;
}

/* Ledger Line (Math Equation) */
.ledger-line {
  font-family: "Spline Sans Mono", monospace;
  font-size: clamp(20px, 4vw, 26px);
  font-weight: 600;
  color: var(--stamp);
  border-top: 2px dashed var(--rule);
  border-bottom: 2px dashed var(--rule);
  padding: 20px 0;
  margin: 40px 0;
  text-transform: uppercase;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
}
.ledger-line::before {
  content: "REF:";
  color: var(--mute);
  font-size: 14px;
  margin-right: 24px;
}

/* Forms */
form {
  background: var(--fill);
  border: 2px solid var(--ink);
  padding: 32px;
  margin: 48px 0;
  box-shadow: 4px 4px 0 var(--grid);
}
label {
  display: block;
  font-family: "Spline Sans Mono", monospace;
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  margin-bottom: 8px;
  color: var(--ink);
}
input {
  width: 100%;
  padding: 16px;
  border: 2px solid var(--rule);
  background: #fff;
  color: var(--ink);
  font-family: "Source Serif 4", serif;
  font-size: 18px;
  margin-bottom: 24px;
  transition: border-color 0.15s ease;
}
input:focus {
  outline: none;
  border-color: var(--stamp);
}

/* Buttons */
.btn, button[type="submit"] {
  display: inline-block;
  width: 100%;
  background: var(--stamp);
  color: #fff;
  border: 2px solid var(--stamp);
  padding: 18px 24px;
  font-family: "Spline Sans Mono", monospace;
  font-size: 16px;
  font-weight: 600;
  text-transform: uppercase;
  text-align: center;
  cursor: pointer;
  transition: all 0.15s ease;
  text-decoration: none;
}
.btn:hover, button[type="submit"]:hover {
  background: var(--stamp-hover);
  border-color: var(--stamp-hover);
  text-decoration: none;
}
.btn.outline {
  background: transparent;
  color: var(--stamp);
  border: 2px solid var(--stamp);
}
.btn.outline:hover {
  background: var(--fill);
  color: var(--stamp-hover);
}

.actions {
  display: grid;
  gap: 12px;
}

.actions .btn {
  width: 100%;
}

/* Notice */
.notice {
  font-family: "Spline Sans Mono", monospace;
  font-size: 12px;
  color: var(--mute);
  margin-top: 16px;
  text-align: center;
}
.error-msg {
  color: var(--stamp);
  background: var(--fill);
  border: 2px solid var(--stamp);
  padding: 16px;
  margin-bottom: 24px;
  font-family: "Spline Sans Mono", monospace;
  font-size: 14px;
  font-weight: 600;
  display: none;
}

@media (max-width: 600px) {
  .title-block { grid-template-columns: 1fr; }
  .ledger-line {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    font-size: 15px;
    overflow-wrap: anywhere;
  }
  .ledger-line::before { margin-right: 0; }
}