/* ==========================================================================
   ISR Calculator — visual identity
   A "cedula de calculo" (tax worksheet) aesthetic: ruled paper, ledger
   greens, a brass accent for stamps/highlights, tabular figures for money.
   (Adaptado del proyecto Flask original — mismo diseño visual.)
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,400;9..144,500;9..144,600;9..144,700&family=IBM+Plex+Sans:wght@400;500;600;700&family=IBM+Plex+Mono:wght@400;500;600&display=swap');

:root {
  --ink: #16233D;
  --ink-soft: #4A5875;
  --paper: #E9EFE7;
  --paper-line: #C9D4C4;
  --card: #FFFFFF;
  --card-border: #DCE3D6;
  --green: #0B6E4F;
  --green-dark: #084F39;
  --green-soft: #E3EFE9;
  --brass: #B98B2E;
  --brass-soft: #F3E9D2;
  --rust: #A6402E;
  --rust-soft: #F7E5E1;

  --font-display: 'Fraunces', Georgia, serif;
  --font-body: 'IBM Plex Sans', system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', 'Courier New', monospace;

  --radius: 6px;
  --shadow: 0 1px 2px rgba(22, 35, 61, 0.06), 0 4px 12px rgba(22, 35, 61, 0.05);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background:
    repeating-linear-gradient(
      to bottom,
      transparent, transparent 27px,
      var(--paper-line) 27px, var(--paper-line) 28px
    ),
    var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.55;
  min-height: 100vh;
}

a { color: var(--green-dark); }
[hidden] { display: none !important; }

.wrap {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 24px 64px;
}

/* ---------- Header / masthead ---------- */

.masthead {
  padding: 28px 24px 22px;
  max-width: 980px;
  margin: 0 auto;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  border-bottom: 2px solid var(--ink);
}

.masthead .brand { display: flex; align-items: baseline; gap: 10px; }

.masthead .brand-mark {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--green-dark);
  border: 1px solid var(--green-dark);
  border-radius: 3px;
  padding: 2px 6px;
}

.masthead h1 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 26px;
  margin: 0;
  letter-spacing: -0.01em;
}

.masthead nav { display: flex; gap: 4px; font-family: var(--font-mono); font-size: 13px; align-items: center; flex-wrap: wrap; }

.masthead nav a, .masthead nav button.navlink {
  text-decoration: none;
  color: var(--ink-soft);
  padding: 6px 10px;
  border-radius: 4px;
  background: none;
  border: none;
  font-family: var(--font-mono);
  font-size: 13px;
  cursor: pointer;
}

.masthead nav a:hover, .masthead nav a.active,
.masthead nav button.navlink:hover, .masthead nav button.navlink.active {
  background: var(--ink);
  color: var(--paper);
}

.masthead .tagline { font-family: var(--font-mono); font-size: 12px; color: var(--ink-soft); margin-top: 4px; }

/* ---------- Cards / sections ---------- */

.card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px;
  margin-top: 28px;
}

.card h2 { font-family: var(--font-display); font-size: 19px; font-weight: 600; margin: 0 0 4px; }
.card .section-note { color: var(--ink-soft); font-size: 13px; margin: 0 0 20px; }

.field-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 14px 16px;
}

.field { display: flex; flex-direction: column; gap: 6px; }

.field label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--ink-soft);
  text-transform: uppercase;
}

.field input, .field select {
  font-family: var(--font-mono);
  font-size: 15px;
  padding: 9px 10px;
  border: 1px solid var(--card-border);
  border-radius: 4px;
  background: #FCFDFB;
  color: var(--ink);
  text-align: right;
}

.field.text input { text-align: left; font-family: var(--font-body); }

.field input:focus, .field select:focus {
  outline: 2px solid var(--green);
  outline-offset: 1px;
  border-color: var(--green);
}

.field .hint { font-size: 11px; color: var(--ink-soft); font-weight: 400; text-transform: none; }

.divider { border: none; border-top: 1px dashed var(--card-border); margin: 24px 0; }

.checkbox-label {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 13.5px;
  color: var(--ink-soft);
  line-height: 1.5;
  cursor: pointer;
  margin-top: 14px;
}
.checkbox-label input[type="checkbox"] { width: 17px; height: 17px; margin-top: 2px; accent-color: var(--green); flex-shrink: 0; }

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 14px;
  padding: 11px 20px;
  border-radius: 5px;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
}
.btn-primary { background: var(--green); color: white; }
.btn-primary:hover { background: var(--green-dark); }
.btn-secondary { background: transparent; border-color: var(--ink); color: var(--ink); }
.btn-secondary:hover { background: var(--ink); color: var(--paper); }
.btn[disabled] { opacity: 0.5; cursor: not-allowed; }

/* ---------- Flash messages ---------- */

.flash { padding: 12px 16px; border-radius: 5px; margin-top: 20px; font-size: 14px; }
.flash-error { background: var(--rust-soft); color: var(--rust); border: 1px solid var(--rust); }
.flash-ok { background: var(--green-soft); color: var(--green-dark); border: 1px solid var(--green); }

/* ---------- Result / ledger table ---------- */

.stamp {
  position: relative;
  float: right;
  width: 132px;
  height: 132px;
  border: 3px solid var(--brass);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  transform: rotate(-8deg);
  color: var(--brass);
  font-family: var(--font-mono);
  margin: -8px 0 12px 20px;
}
.stamp .stamp-inner {
  border: 1px solid var(--brass);
  border-radius: 50%;
  width: 112px;
  height: 112px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  padding: 8px;
}
.stamp .stamp-label { font-size: 9px; letter-spacing: 0.08em; text-transform: uppercase; }
.stamp .stamp-value { font-size: 15px; font-weight: 600; line-height: 1.15; }

.table-scroll { overflow-x: auto; }

.ledger-table { width: 100%; border-collapse: collapse; font-family: var(--font-mono); font-size: 13.5px; }
.ledger-table th {
  text-align: left;
  font-family: var(--font-body);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  border-bottom: 2px solid var(--ink);
  padding: 8px 10px;
  white-space: nowrap;
}
.ledger-table td { padding: 8px 10px; border-bottom: 1px solid var(--card-border); }
.ledger-table td.num, .ledger-table th.num { text-align: right; }
.ledger-table tr.total td { font-weight: 600; border-top: 2px solid var(--ink); border-bottom: none; }

.summary-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 16px; margin: 20px 0; }
.summary-item { background: var(--green-soft); border-radius: var(--radius); padding: 14px 16px; }
.summary-item.summary-highlight { background: var(--brass-soft); border: 1px solid var(--brass); }
.summary-item.summary-highlight .label { color: var(--brass); }
.summary-item .label { font-size: 11px; text-transform: uppercase; letter-spacing: 0.04em; color: var(--green-dark); font-weight: 600; }
.summary-item .value { font-family: var(--font-mono); font-size: 22px; font-weight: 600; color: var(--ink); margin-top: 4px; }

.tag { display: inline-block; font-family: var(--font-mono); font-size: 11px; padding: 2px 8px; border-radius: 3px; background: var(--brass-soft); color: var(--brass); font-weight: 600; }
.tag.warn { background: var(--rust-soft); color: var(--rust); }
.tag.ok { background: var(--green-soft); color: var(--green-dark); }

footer.meta { margin-top: 40px; padding-top: 16px; border-top: 1px solid var(--card-border); font-family: var(--font-mono); font-size: 11px; color: var(--ink-soft); }

@media (max-width: 640px) {
  .masthead { padding: 20px 16px; }
  .wrap { padding: 0 16px 48px; }
  .card { padding: 20px; }
  .stamp { float: none; margin: 0 auto 16px; }
}