:root {
  --bg: #f2f3f5;
  --surface: #ffffff;
  --surface-2: #f7f8f9;
  --text: #16181d;
  --text-soft: #5b616e;
  --line: #dfe2e7;
  --line-strong: #c7ccd4;
  --accent: #b4552b;
  --accent-soft: #f6ece6;
  --accent-text: #8f4322;
  --bad: #9c2f2f;
  --radius: 4px;
  --shadow: 0 1px 2px rgba(22, 24, 29, 0.05);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --surface: #1b1e23;
    --surface-2: #212429;
    --text: #e8eaee;
    --text-soft: #9aa1ad;
    --line: #2b2f36;
    --line-strong: #3a3f48;
    --accent: #d97a4e;
    --accent-soft: #2a2019;
    --accent-text: #e79468;
    --bad: #e07a72;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: 'Geist', system-ui, sans-serif;
  font-size: 15px;
  line-height: 1.55;
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Topbar */

.topbar {
  height: 64px;
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 0 24px;
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}

.topbar-title {
  font-weight: 600;
  font-size: 14px;
  color: var(--text-soft);
}

/* Layout: asymmetric two-column, table left, results right */

.layout {
  max-width: 1080px;
  margin: 0 auto;
  padding: 40px 24px 96px;
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  gap: 40px 32px;
  align-items: start;
}

.col-full { grid-column: 1 / -1; }

.section-head { margin-bottom: 20px; }

h1, h2, h3 {
  margin: 0;
  font-weight: 600;
  letter-spacing: -0.015em;
}
h1 { font-size: 26px; }
h2 { font-size: 22px; }
h3 { font-size: 15px; }

.lede {
  margin: 6px 0 0;
  color: var(--text-soft);
  font-size: 14px;
  max-width: 58ch;
}

/* Table */

.table-wrap {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

table {
  width: 100%;
  border-collapse: collapse;
}

thead th {
  text-align: left;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-soft);
  padding: 12px 10px;
  background: var(--surface-2);
  border-bottom: 1px solid var(--line);
}

.c-num, .c-flag, .c-del { text-align: center; width: 1%; white-space: nowrap; }

tbody td {
  padding: 8px 10px;
  border-bottom: 1px solid var(--line);
  vertical-align: middle;
}
tbody tr:last-child td { border-bottom: 0; }

.empty {
  margin: 0;
  padding: 32px 20px;
  text-align: center;
  color: var(--text-soft);
  font-size: 14px;
  line-height: 1.7;
}

/* Fields */

input[type="text"],
input[type="number"] {
  font-family: inherit;
  font-size: 14px;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: 7px 9px;
  outline: none;
  width: 100%;
}
input[type="number"] {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  text-align: center;
  width: 74px;
}
input::placeholder { color: var(--text-soft); opacity: 0.7; }
input:focus-visible {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
input:disabled {
  background: var(--surface-2);
  color: var(--text-soft);
  cursor: not-allowed;
}

input[type="checkbox"] {
  width: 17px;
  height: 17px;
  accent-color: var(--accent);
  cursor: pointer;
}

.del-btn {
  width: 28px;
  height: 28px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  background: none;
  color: var(--text-soft);
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
}
.del-btn:hover { color: var(--bad); border-color: var(--line-strong); }
.del-btn:active { transform: scale(0.94); }

/* Buttons */

.btn {
  font-family: inherit;
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: 9px 16px;
  cursor: pointer;
}
.btn:hover { border-color: var(--text-soft); }
.btn:active { transform: translateY(1px); }
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
}
.btn-primary:hover { background: var(--accent-text); border-color: var(--accent-text); }

.btn-quiet {
  background: none;
  border-color: transparent;
  color: var(--text-soft);
}
.btn-quiet:hover { color: var(--bad); border-color: var(--line-strong); }

.row-actions {
  display: flex;
  gap: 8px;
  margin-top: 14px;
}

/* Side column */

.col-side {
  position: sticky;
  top: 24px;
  display: grid;
  gap: 16px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
}

.card-label {
  margin: 0;
  font-size: 13px;
  color: var(--text-soft);
}

.readout-value {
  margin: 4px 0 0;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 46px;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.readout-value.is-empty { color: var(--line-strong); }

.readout-meta {
  margin: 2px 0 0;
  font-size: 13px;
  color: var(--text-soft);
}

.mention {
  margin: 12px 0 0;
  padding: 7px 10px;
  background: var(--accent-soft);
  color: var(--accent-text);
  border-radius: var(--radius);
  font-size: 13px;
  font-weight: 500;
}

.field-label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 6px;
}

.field-row {
  display: flex;
  gap: 8px;
}
.field-row input { width: 92px; flex: 0 0 auto; }
.field-row .btn { flex: 1; }

.field-help {
  margin: 8px 0 0;
  font-size: 12.5px;
  color: var(--text-soft);
}

.field-result {
  margin: 10px 0 0;
  font-size: 14px;
  min-height: 1px;
}
.field-result strong { font-family: 'JetBrains Mono', ui-monospace, monospace; }
.field-result.is-bad { color: var(--bad); }
.field-result.is-ok { color: var(--accent-text); }

/* Coefficients reference */

.coef-groups {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.coef-group {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
}

.coef-group-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.coef-total {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 24px;
  font-weight: 800;
  color: var(--accent-text);
  font-variant-numeric: tabular-nums;
}

.coef-list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 7px;
}
.coef-list li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  font-size: 14px;
}
.coef-list .coef-val {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: var(--text-soft);
}
.coef-list .coef-note {
  display: block;
  font-size: 12.5px;
  color: var(--text-soft);
}

.coef-actions { margin-top: 16px; }
.coef-actions .field-help { max-width: 60ch; }

/* Responsive */

@media (max-width: 860px) {
  .layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
    padding: 28px 16px 72px;
  }
  .col-side { position: static; }
  .coef-groups { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 560px) {
  thead { display: none; }
  tbody tr {
    display: grid;
    grid-template-columns: 1fr auto auto auto;
    grid-template-areas:
      "name name name del"
      "coef note flag flag";
    gap: 8px;
    padding: 12px 10px;
    border-bottom: 1px solid var(--line);
  }
  tbody td { padding: 0; border: 0; }
  tbody td.c-name { grid-area: name; }
  tbody td.c-coef { grid-area: coef; }
  tbody td.c-note { grid-area: note; }
  tbody td.c-flag { grid-area: flag; display: flex; align-items: center; gap: 6px; }
  tbody td.c-del { grid-area: del; text-align: right; }
  .cell-label {
    font-size: 12px;
    color: var(--text-soft);
    display: block;
    margin-bottom: 2px;
  }
  .readout-value { font-size: 40px; }
}

@media (min-width: 561px) {
  .cell-label { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
  .btn:active, .del-btn:active { transform: none; }
}

/* Focus clavier : un contour visible sur tout ce qu'on atteint avec Tab.
   :focus-visible ne s'affiche pas au clic souris, seulement au clavier. */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}