/* Debt Snowball Calculator — clean, mobile-first */

* { box-sizing: border-box; }

:root {
  --bg: #ffffff;
  --fg: #111418;
  --muted: #5b6470;
  --line: #e3e6ea;
  --line-strong: #cdd2d8;
  --accent: #0b6cf7;
  --accent-press: #0850c0;
  --danger: #b42318;
  --good: #067647;
  --soft: #f6f8fb;
  --radius: 8px;
  --tap: 44px;
}

html, body { background: var(--bg); color: var(--fg); }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
}

h1, h2, h3 { color: var(--fg); margin: 0 0 .5rem; line-height: 1.25; }
h1 { font-size: 1.75rem; font-weight: 700; }
h2 { font-size: 1.25rem; font-weight: 600; margin-top: 2rem; }
h3 { font-size: 1rem; font-weight: 600; margin-top: 1.25rem; }

p { margin: 0 0 1rem; }

.page-head {
  max-width: 880px;
  margin: 0 auto;
  padding: 1.5rem 1rem 1rem;
}
.page-head .subhead {
  color: var(--muted);
  font-size: 1rem;
  margin: .5rem 0 0;
}

main {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 1rem 3rem;
}

/* TOOL */

.tool {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg);
  padding: 1rem;
  margin-top: 1rem;
}

.tool-bar, .row-main {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr .8fr 36px 36px;
  gap: .5rem;
  align-items: center;
}
.tool-bar {
  font-size: .8rem;
  font-weight: 600;
  color: var(--muted);
  padding: 0 .25rem .5rem;
  border-bottom: 1px solid var(--line);
  margin-bottom: .5rem;
}
.bar-cell.bar-num { text-align: right; }
.bar-cell.bar-more, .bar-cell.bar-del { width: 36px; }

.rows {
  display: flex;
  flex-direction: column;
  gap: .5rem;
}

.row {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--soft);
  padding: .5rem;
}
.row-main {
  background: transparent;
  border: 0;
  padding: 0;
  margin: 0;
}

.row .more-btn, .row .del-btn {
  width: 36px;
  height: var(--tap);
  border: 1px solid var(--line-strong);
  background: var(--bg);
  color: var(--muted);
  border-radius: var(--radius);
  font-size: 1.1rem;
  cursor: pointer;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
.row .more-btn:hover { color: var(--accent); border-color: var(--accent); }
.row .del-btn:hover { color: var(--danger); border-color: var(--danger); }
.row .more-btn[aria-expanded="true"] { background: var(--accent); color: #fff; border-color: var(--accent); }

.row-advanced {
  margin-top: .5rem;
  padding-top: .5rem;
  border-top: 1px dashed var(--line-strong);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: .5rem .75rem;
}
.row-advanced[hidden] { display: none; }
.row-advanced label {
  display: flex;
  flex-direction: column;
  gap: .25rem;
  font-size: .75rem;
  font-weight: 600;
  color: var(--muted);
}
.row-advanced label.exclude-label {
  flex-direction: row;
  align-items: center;
  gap: .35rem;
  height: var(--tap);
}
.row-advanced label.exclude-label input { width: 18px; height: 18px; }
.row-advanced .field-wrap {
  display: flex;
  align-items: center;
  gap: .25rem;
}
.row-advanced .field-wrap .prefix { color: var(--muted); font-size: .8rem; }
.row-advanced select, .row-advanced input {
  flex: 1;
  height: 36px;
  padding: 0 .5rem;
  font-size: .9rem;
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  background: var(--bg);
  color: var(--fg);
  min-width: 0;
}
.row-advanced input[type="checkbox"] { flex: 0 0 18px; }

input[type="text"], input[type="number"] {
  width: 100%;
  height: var(--tap);
  padding: 0 .75rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  font: inherit;
  background: var(--bg);
  color: var(--fg);
}
.row-main input { background: var(--bg); }
.row-main input[type="number"] { text-align: right; }
input:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: var(--accent); }

.tool-actions {
  margin-top: .75rem;
  display: flex;
  gap: .5rem;
}

.extra-row {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}
.extra-row label {
  display: block;
  font-weight: 600;
  font-size: .9rem;
  margin-bottom: .5rem;
}
.extra-input-wrap {
  position: relative;
  max-width: 240px;
}
.extra-input-wrap .prefix {
  position: absolute;
  left: .75rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--muted);
  pointer-events: none;
  font-size: .9rem;
}
.extra-input-wrap input { padding-left: 1.5rem; }

.adv-toggle {
  margin-top: .75rem;
  font-size: .9rem;
}

.advanced {
  margin-top: .75rem;
  padding-top: .75rem;
  border-top: 1px dashed var(--line-strong);
}
.advanced[hidden] { display: none; }
.adv-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}
.adv-field label {
  display: block;
  font-weight: 600;
  font-size: .85rem;
  margin-bottom: .35rem;
  color: var(--fg);
}
.adv-input-wrap {
  position: relative;
}
.adv-input-wrap .prefix {
  position: absolute;
  left: .6rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--muted);
  pointer-events: none;
  font-size: .8rem;
}
.adv-input-wrap input, .adv-input-wrap select {
  width: 100%;
  height: 40px;
  padding: 0 .6rem 0 3.2rem;
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  font: inherit;
  font-size: .95rem;
  background: var(--bg);
  color: var(--fg);
}
.adv-input-wrap select { padding-left: .6rem; }
.adv-pair {
  display: flex;
  gap: .5rem;
}
.adv-pair .adv-input-wrap { flex: 1; }
.adv-trio { flex-wrap: wrap; }

.calc-row {
  margin-top: 1rem;
  display: flex;
  gap: .5rem;
  flex-wrap: wrap;
}

.btn {
  height: var(--tap);
  padding: 0 1.25rem;
  border-radius: var(--radius);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.btn-primary:hover { background: var(--accent-press); border-color: var(--accent-press); }
.btn-secondary {
  background: var(--soft);
  color: var(--fg);
  border-color: var(--line-strong);
}
.btn-secondary:hover { background: #eef1f5; }
.btn-ghost {
  background: transparent;
  color: var(--accent);
  border-color: transparent;
}
.btn-ghost:hover { background: var(--soft); }

.error {
  margin-top: 1rem;
  padding: .75rem;
  background: #fff4f4;
  border: 1px solid #fbd1d1;
  color: var(--danger);
  border-radius: var(--radius);
}

/* RESULTS */

.results {
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid var(--line);
}

.summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: .75rem;
}
.card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem;
  background: var(--soft);
}
.card-target {
  border-color: var(--accent);
  background: #eff6ff;
}
.card-label {
  font-size: .8rem;
  color: var(--muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .03em;
}
.card-value {
  font-size: 1.6rem;
  font-weight: 700;
  margin: .25rem 0;
}
.card-sub {
  font-size: .85rem;
  color: var(--muted);
}

.results-actions {
  margin-top: 1rem;
  display: flex;
  align-items: center;
  gap: .75rem;
  flex-wrap: wrap;
}
.copy-status {
  color: var(--good);
  font-size: .9rem;
  font-weight: 600;
}

.section-h {
  margin-top: 2rem;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .95rem;
  min-width: 480px;
}
.data-table th, .data-table td {
  padding: .65rem .75rem;
  text-align: left;
  border-bottom: 1px solid var(--line);
}
.data-table th {
  background: var(--soft);
  font-weight: 600;
  color: var(--muted);
  font-size: .85rem;
}
.data-table td.num, .data-table th.num { text-align: right; font-variant-numeric: tabular-nums; }
.data-table tr:last-child td { border-bottom: 0; }

/* EXPLAINER */

.explainer {
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid var(--line);
  color: var(--fg);
}
.explainer p, .explainer ul { color: var(--fg); }
.explainer ul { padding-left: 1.25rem; }
.explainer li { margin-bottom: .5rem; }

/* FOOTER */

.page-foot {
  max-width: 880px;
  margin: 0 auto;
  padding: 1rem;
  border-top: 1px solid var(--line);
  text-align: center;
  color: var(--muted);
  font-size: .85rem;
}
.foot-nav {
  margin: .5rem 0;
  display: flex;
  gap: 1rem;
  justify-content: center;
}
.foot-nav a {
  color: var(--accent);
  text-decoration: none;
}
.foot-nav a:hover { text-decoration: underline; }
.foot-copy { margin: .25rem 0 0; font-size: .8rem; }

/* MOBILE — single column for inputs */

@media (max-width: 640px) {
  .page-head { padding: 1rem .75rem .5rem; }
  main { padding: 0 .75rem 2rem; }
  h1 { font-size: 1.5rem; }
  .tool { padding: .75rem; }

  .tool-bar { display: none; }

  .row-main {
    display: grid;
    grid-template-columns: 1fr 1fr 36px 36px;
    grid-template-areas:
      "name  name  more del"
      "bal   rate  more del"
      "min   min   more del";
    gap: .4rem;
  }
  .row-main .name { grid-area: name; }
  .row-main .bal  { grid-area: bal; }
  .row-main .min  { grid-area: min; }
  .row-main .rate { grid-area: rate; }
  .row-main .more-btn { grid-area: more; align-self: center; }
  .row-main .del-btn  { grid-area: del; align-self: start; }

  .row-main .name::before { content: "Debt name"; display: block; font-size: .75rem; color: var(--muted); font-weight: 600; margin-bottom: .25rem; }
  .row-main .bal::before  { content: "Balance ($)"; display: block; font-size: .75rem; color: var(--muted); font-weight: 600; margin-bottom: .25rem; }
  .row-main .min::before  { content: "Min payment ($)"; display: block; font-size: .75rem; color: var(--muted); font-weight: 600; margin-bottom: .25rem; }
  .row-main .rate::before { content: "APR (%)"; display: block; font-size: .75rem; color: var(--muted); font-weight: 600; margin-bottom: .25rem; }

  .row-advanced { grid-template-columns: 1fr 1fr; }
  .row-advanced label { font-size: .7rem; }

  .summary { grid-template-columns: 1fr 1fr; }
  .card-value { font-size: 1.25rem; }

  .calc-row .btn-primary { width: 100%; }
  .results-actions .btn { width: 100%; }
}