:root {
  --bg: #0f1115;
  --surface: #1a1d24;
  --border: #2a2f3a;
  --text: #e6e8ec;
  --muted: #9aa2b1;
  --accent: #4f9dff;
  --danger: #ff6b6b;
  --positive: #4fd18b;
  --radius: 10px;
}

* {
  box-sizing: border-box;
}

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

body {
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

.app {
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 1rem 4rem;
}

.app__header {
  text-align: center;
  margin-bottom: 2rem;
}

.app__header h1 {
  margin: 0;
  font-size: 2rem;
  letter-spacing: -0.02em;
}

.app__tagline {
  margin: 0.25rem 0 0;
  color: var(--muted);
}

.status {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  text-align: center;
  color: var(--muted);
}

/* --- Phase 2: form layout -------------------------------------------------- */

.klus-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.card__title {
  margin: 0 0 1rem;
  font-size: 1.1rem;
  letter-spacing: -0.01em;
}

.field {
  margin-bottom: 1rem;
}

.field:last-child {
  margin-bottom: 0;
}

.field__label {
  display: block;
  margin-bottom: 0.35rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.field__control {
  display: flex;
  align-items: stretch;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  overflow: hidden;
}

.field__control:focus-within {
  border-color: var(--accent);
}

.field__prefix,
.field__suffix {
  display: flex;
  align-items: center;
  padding: 0 0.65rem;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.03);
  user-select: none;
}

.field__input {
  flex: 1;
  min-width: 0;
  width: 100%;
  padding: 0.6rem 0.7rem;
  border: none;
  outline: none;
  background: var(--bg);
  color: var(--text);
  font-size: 1rem;
  font-family: inherit;
}

.field__input::placeholder {
  color: var(--muted);
}

/* Bare inputs (not wrapped in a .field__control) need their own border. */
.roster__name,
.roster__add .field__input,
.category-row__name {
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.roster__name:focus,
.roster__add .field__input:focus,
.category-row__name:focus {
  border-color: var(--accent);
}

.field__error {
  min-height: 1.1rem;
  margin: 0.3rem 0 0;
  color: var(--danger);
  font-size: 0.82rem;
}

.field--invalid .field__control,
.field--invalid .field__input {
  border-color: var(--danger);
}

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

.btn {
  padding: 0.55rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--accent);
  color: #06121f;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
}

.btn:hover {
  filter: brightness(1.05);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn--danger {
  background: transparent;
  border-color: var(--danger);
  color: var(--danger);
  font-weight: 500;
}

.btn--ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--text);
  font-weight: 500;
}

/* --- Phase 4: actions bar (currency + reset) ------------------------------- */

.app__actions {
  display: flex;
  gap: 0.75rem;
  align-items: flex-end;
  justify-content: flex-end;
  flex-wrap: wrap;
  margin-bottom: 1.25rem;
}

.app__actions-item {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.app__actions-label {
  color: var(--muted);
  font-size: 0.9rem;
}

.app__currency {
  padding: 0.55rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--text);
  font-family: inherit;
  font-size: 0.9rem;
}

/* --- Custom categories ----------------------------------------------------- */

.category-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.category-row {
  display: grid;
  grid-template-columns: 1fr 9rem 8rem auto;
  gap: 0.6rem;
  align-items: center;
  padding: 0.6rem;
  border: 1px solid var(--border);
  border-left-width: 4px;
  border-radius: var(--radius);
}

.category-row__amount-control {
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.category-row--cost {
  border-left-color: var(--danger);
}

.category-row--addition {
  border-left-color: var(--positive);
}

.category-row__type {
  padding: 0.55rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--text);
  font-family: inherit;
  font-size: 0.9rem;
}

/* --- Roster ---------------------------------------------------------------- */

.roster__list {
  list-style: none;
  margin: 0 0 1rem;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.roster__item {
  display: flex;
  gap: 0.6rem;
  align-items: center;
}

.roster__item .roster__name {
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.roster__add {
  display: flex;
  gap: 0.6rem;
  align-items: center;
}

.roster__add .field__input {
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

/* --- Presence -------------------------------------------------------------- */

.presence__list {
  list-style: none;
  margin: 0 0 1rem;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.presence__row {
  display: grid;
  grid-template-columns: 1fr auto 8rem;
  gap: 0.75rem;
  align-items: center;
  padding: 0.5rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.presence__name {
  font-weight: 600;
}

.presence__toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--muted);
  cursor: pointer;
}

.presence__percent-control {
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.presence__percent:disabled {
  opacity: 0.5;
}

.allocation-counter {
  margin: 0;
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--muted);
  font-weight: 600;
}

.allocation-counter--over {
  border-color: var(--danger);
  color: var(--danger);
}

/* Subtle side accent while required fields are missing or allocation is over.
   Uses an inset shadow so it never shifts the layout. */
.klus-form--not-ready {
  box-shadow: inset 3px 0 0 var(--danger);
}

/* --- Phase 3: results ------------------------------------------------------ */

.results {
  margin-top: 1.25rem;
}

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

.results-table + .net-amount {
  margin-top: 0.85rem;
}

.net-amount + .results-table {
  margin-top: 0.85rem;
}

.results-table__caption {
  text-align: left;
  padding-bottom: 0.4rem;
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 600;
}

.breakdown__row {
  border-bottom: 1px solid var(--border);
}

.breakdown__row:last-child {
  border-bottom: none;
}

.breakdown__label {
  padding: 0.4rem 0;
  color: var(--text);
}

.breakdown__amount {
  padding: 0.4rem 0;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.breakdown__amount--negative {
  color: var(--danger);
}

.net-amount {
  margin: 0.85rem 0;
  font-size: 1.35rem;
  font-weight: 700;
}

.net-amount--positive {
  color: var(--positive);
}

.net-amount--negative {
  color: var(--danger);
}

.loss-warning {
  margin: 0 0 1rem;
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--danger);
  border-radius: var(--radius);
  background: rgba(255, 107, 107, 0.12);
  color: var(--danger);
  font-weight: 600;
}

.payout__row {
  border-bottom: 1px solid var(--border);
}

.payout__name {
  padding: 0.4rem 0;
  font-weight: 600;
}

.payout__percent {
  padding: 0.4rem 0.6rem;
  color: var(--muted);
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.payout__amount {
  padding: 0.4rem 0;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.payout__row--company,
.payout__row--unallocated {
  color: var(--muted);
  border-top: 1px solid var(--border);
}

.payout__row--company .payout__name,
.payout__row--unallocated .payout__name {
  color: var(--muted);
}

@media (max-width: 480px) {
  .app {
    padding: 1.5rem 0.75rem 3rem;
  }
  .app__header h1 {
    font-size: 1.6rem;
  }
  .category-row {
    grid-template-columns: 1fr;
  }
  .category-row__amount-control,
  .category-row__type,
  .category-row__remove {
    width: 100%;
  }
  .presence__row {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }
  .presence__percent-control {
    width: 100%;
  }
  .roster__add {
    flex-wrap: wrap;
  }
  .roster__add .field__input {
    flex: 1 1 100%;
  }
  .app__actions {
    justify-content: stretch;
  }
  .app__actions-item {
    flex: 1 1 auto;
  }
  .app__currency {
    width: 100%;
  }
  .app__actions .btn--ghost {
    flex: 1 1 auto;
  }
}