@import url('https://fonts.googleapis.com/css2?family=Special+Elite&family=IBM+Plex+Sans:wght@400;500;600;700&family=IBM+Plex+Mono:wght@400;500;600&display=swap');

:root {
  --green-deep: #1F3A2E;
  --green-panel: #294535;
  --green-line: #3E6552;
  --paper: #F2EFE4;
  --paper-dim: #E4DFCD;
  --ink: #1F2A22;
  --ink-soft: #5C6B5F;
  --red: #B23A2E;
  --brass: #C9A24A;
  --brass-dim: #8E742F;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--green-deep);
  background-image: radial-gradient(circle at 50% -10%, var(--green-panel), var(--green-deep) 65%);
  color: var(--paper);
  font-family: 'IBM Plex Sans', sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 36px 16px 72px;
}

a { color: inherit; }

:focus-visible {
  outline: 2px solid var(--brass);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: no-preference) {
  .home-card, .toggle-group label, .calc-btn, .ghost-btn, .row-remove {
    transition: transform 0.15s ease, background-color 0.15s ease, border-color 0.15s ease;
  }
}

/* ---------- Brand / header ---------- */

.eyebrow {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--brass);
  margin: 0 0 14px;
  text-align: center;
}

.brand-title {
  font-family: 'Special Elite', monospace;
  font-size: clamp(34px, 7vw, 54px);
  font-weight: 400;
  letter-spacing: 0.01em;
  margin: 0;
  text-align: center;
  color: var(--paper);
}

.brand-subtitle {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 14px;
  color: var(--brass);
  margin: 6px 0 0;
  text-align: center;
}

.page-header {
  width: 100%;
  max-width: 560px;
  margin-bottom: 28px;
}

.back-link {
  display: inline-block;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12px;
  letter-spacing: 0.04em;
  text-decoration: none;
  color: var(--brass);
  margin-bottom: 18px;
}

.back-link:hover { color: var(--paper); }

.page-title {
  font-family: 'Special Elite', monospace;
  font-size: clamp(28px, 6vw, 38px);
  font-weight: 400;
  margin: 0;
  color: var(--paper);
}

.page-tagline {
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 14px;
  color: var(--paper-dim);
  margin: 8px 0 0;
  max-width: 46ch;
}

/* ---------- Home page cards ---------- */

.home {
  width: 100%;
  display: flex;
  justify-content: center;
}

.ledger-cover {
  width: 100%;
  max-width: 560px;
  padding: 44px 32px 36px;
  border: 1px solid var(--green-line);
  position: relative;
}

.ledger-cover::before {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px solid var(--green-line);
  pointer-events: none;
}

.home-cards {
  margin-top: 40px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.home-card {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "num title"
    "num desc"
    "num cta";
  column-gap: 14px;
  row-gap: 4px;
  text-decoration: none;
  background: var(--green-panel);
  border: 1px solid var(--green-line);
  border-radius: 2px;
  padding: 18px 20px;
}

.home-card:hover {
  border-color: var(--brass);
  transform: translateX(2px);
}

.home-card-num {
  grid-area: num;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 13px;
  color: var(--brass);
  align-self: start;
  padding-top: 2px;
}

.home-card-title {
  grid-area: title;
  font-family: 'Special Elite', monospace;
  font-size: 20px;
  color: var(--paper);
}

.home-card-desc {
  grid-area: desc;
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--paper-dim);
}

.home-card-cta {
  grid-area: cta;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12px;
  color: var(--brass);
  margin-top: 6px;
}

/* ---------- Ledger sheet (form panel) ---------- */

.sheet {
  width: 100%;
  max-width: 560px;
  background: var(--paper);
  color: var(--ink);
  border-radius: 3px;
  padding: 30px 26px 34px;
  box-shadow: 0 18px 40px rgba(0,0,0,0.28);
}

.field {
  margin-bottom: 26px;
  position: relative;
  padding-left: 30px;
}

.field-num {
  position: absolute;
  left: 0;
  top: 1px;
  margin: 0;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12px;
  color: var(--brass-dim);
}

.field-label {
  display: block;
  font-family: 'IBM Plex Sans', sans-serif;
  font-weight: 600;
  font-size: 14px;
  color: var(--ink);
  margin-bottom: 10px;
}

.sub-field {
  margin-top: 12px;
}

.sub-label {
  display: block;
  font-size: 12px;
  color: var(--ink-soft);
  margin-bottom: 6px;
}

/* ---------- Toggle groups (radio-as-button) ---------- */

.toggle-group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.toggle-group input[type="radio"] {
  position: absolute;
  opacity: 0;
  width: 1px;
  height: 1px;
}

.toggle-group label {
  cursor: pointer;
  font-size: 13.5px;
  font-weight: 500;
  padding: 9px 16px;
  border: 1px solid var(--ink-soft);
  border-radius: 2px;
  color: var(--ink-soft);
  background: transparent;
  user-select: none;
}

.toggle-group input[type="radio"]:checked + label {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}

.toggle-group input[type="radio"]:focus-visible + label {
  outline: 2px solid var(--red);
  outline-offset: 2px;
}

.toggle-group.quad label {
  flex: 1 1 calc(50% - 8px);
  text-align: center;
}

/* ---------- Inputs ---------- */

.num-input, input[type="date"], select {
  width: 100%;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 15px;
  padding: 10px 12px;
  border: 1px solid #C7C1AC;
  border-radius: 2px;
  background: #FBFAF5;
  color: var(--ink);
}

.num-input:disabled {
  background: #E9E5D6;
  color: var(--ink-soft);
  font-style: italic;
}

/* ---------- Cash flow rows ---------- */

.cf-row {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-bottom: 10px;
}

.cf-row .num-input, .cf-row input[type="date"] {
  flex: 1 1 auto;
}

.cf-row-period {
  flex: 0 0 auto;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12px;
  color: var(--ink-soft);
  width: 96px;
}

.row-remove {
  flex: 0 0 auto;
  width: 30px;
  height: 30px;
  border: 1px solid #C7C1AC;
  background: transparent;
  color: var(--ink-soft);
  border-radius: 2px;
  cursor: pointer;
  font-size: 16px;
  line-height: 1;
}

.row-remove:hover { border-color: var(--red); color: var(--red); }

.ghost-btn {
  margin-top: 4px;
  background: none;
  border: 1px dashed var(--ink-soft);
  color: var(--ink-soft);
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 13px;
  padding: 8px 14px;
  border-radius: 2px;
  cursor: pointer;
}

.ghost-btn:hover { border-color: var(--ink); color: var(--ink); }

.ghost-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* ---------- Calculate button ---------- */

.calc-btn {
  width: 100%;
  background: var(--red);
  color: var(--paper);
  border: none;
  font-family: 'IBM Plex Sans', sans-serif;
  font-weight: 600;
  font-size: 15px;
  letter-spacing: 0.02em;
  padding: 14px 18px;
  border-radius: 2px;
  cursor: pointer;
  margin-top: 6px;
}

.calc-btn:hover { background: #9A2F25; }

/* ---------- Answer tape (signature element) ---------- */

.tape {
  max-width: 320px;
  margin: 34px auto 0;
}

.tape.hidden { display: none; }

.tape-body {
  background: var(--paper);
  border: 1px solid #D8D2BC;
  border-bottom: none;
  padding: 22px 20px 26px;
  text-align: center;
}

.tape-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--ink-soft);
  margin: 0 0 10px;
}

.tape-amount {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 30px;
  font-weight: 600;
  color: var(--red);
  margin: 0;
  letter-spacing: 0.01em;
}

.tape-note {
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 12px;
  color: var(--ink-soft);
  margin: 12px 0 0;
  line-height: 1.5;
}

.tape-note.error { color: var(--red); font-weight: 600; }

.tape-edge {
  height: 12px;
  background-image:
    linear-gradient(-45deg, var(--paper) 6px, transparent 6px),
    linear-gradient(45deg, var(--paper) 6px, transparent 6px);
  background-position: bottom left;
  background-repeat: repeat-x;
  background-size: 12px 12px;
}

/* ---------- Responsive ---------- */

@media (max-width: 420px) {
  .sheet { padding: 24px 18px 28px; }
  .ledger-cover { padding: 32px 20px 28px; }
  .toggle-group.quad label { flex: 1 1 100%; }
}

@media (min-width: 760px) {
  .ledger-cover { max-width: 820px; padding: 56px 56px 48px; }

  .home-cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px 22px;
  }

  .home-card { padding: 22px 24px; }
  .home-card-title { font-size: 22px; }
  .home-card-desc { font-size: 14px; }
}