/* public/style.css — mobile-first, responsive */

/* ── Reset & base ────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --clr-bg:         #f5f5f5;
  --clr-surface:    #ffffff;
  --clr-primary:    #4f6ef7;
  --clr-primary-dk: #3a56d4;
  --clr-danger:     #e53935;
  --clr-success:    #2e7d32;
  --clr-text:       #1a1a1a;
  --clr-muted:      #757575;
  --clr-border:     #e0e0e0;
  --clr-positive:   #2e7d32;
  --clr-negative:   #c62828;
  --radius:         12px;
  --radius-sm:      8px;
  --shadow:         0 2px 8px rgba(0,0,0,.08);
  --shadow-lg:      0 4px 20px rgba(0,0,0,.12);
  --transition:     160ms ease;
  --font:           -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

html { font-size: 16px; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font);
  background: var(--clr-bg);
  color: var(--clr-text);
  min-height: 100dvh;
  line-height: 1.5;
}

a { color: inherit; text-decoration: none; }

/* ── Layout ──────────────────────────────────────── */
.page {
  max-width: 480px;
  margin: 0 auto;
  padding: 0 16px 96px;
}

/* ── Top bar ─────────────────────────────────────── */
.topbar {
  position: sticky;
  top: 0;
  background: var(--clr-surface);
  border-bottom: 1px solid var(--clr-border);
  padding: 14px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  z-index: 10;
  box-shadow: var(--shadow);
}
.topbar__title { font-size: 1.1rem; font-weight: 700; flex: 1; }
.topbar__back {
  background: none;
  border: none;
  font-size: 1.4rem;
  cursor: pointer;
  padding: 4px 8px 4px 0;
  color: var(--clr-primary);
  line-height: 1;
}
.topbar__action {
  background: none;
  border: none;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--clr-muted);
  padding: 4px 0;
}

/* ── Cards ───────────────────────────────────────── */
.card {
  background: var(--clr-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px;
}

/* ── Kid cards grid ──────────────────────────────── */
.kids-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  padding-top: 16px;
}

.kid-card {
  background: var(--clr-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  border: 2px solid transparent;
  transition: border-color var(--transition), box-shadow var(--transition);
  -webkit-tap-highlight-color: transparent;
}
.kid-card:active { border-color: var(--clr-primary); box-shadow: var(--shadow-lg); }

.kid-card__avatar { font-size: 2.5rem; line-height: 1; }
.kid-card__name   { font-size: 1rem; font-weight: 700; }
.kid-card__balance {
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -.02em;
}
.kid-card__balance--positive { color: var(--clr-positive); }
.kid-card__balance--negative { color: var(--clr-negative); }
.kid-card__balance--zero     { color: var(--clr-muted); }

/* ── Add Kid button ──────────────────────────────── */
.add-kid-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  margin-top: 16px;
  padding: 16px;
  background: var(--clr-surface);
  border: 2px dashed var(--clr-border);
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  color: var(--clr-primary);
  cursor: pointer;
  transition: background var(--transition);
}
.add-kid-btn:active { background: #eef0ff; }

/* ── Forms ───────────────────────────────────────── */
.form-section {
  padding-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

label {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--clr-muted);
}

input[type="text"],
input[type="number"],
input[type="password"] {
  width: 100%;
  padding: 14px 16px;
  font-size: 1rem;
  font-family: var(--font);
  border: 1.5px solid var(--clr-border);
  border-radius: var(--radius-sm);
  background: var(--clr-surface);
  color: var(--clr-text);
  transition: border-color var(--transition);
  -webkit-appearance: none;
}
input:focus {
  outline: none;
  border-color: var(--clr-primary);
}

/* ── Chip / toggle button groups ─────────────────── */
.chip-group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  padding: 10px 16px;
  border-radius: 999px;
  border: 1.5px solid var(--clr-border);
  background: var(--clr-surface);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
  -webkit-tap-highlight-color: transparent;
  white-space: nowrap;
  min-height: 44px;
  display: flex;
  align-items: center;
}
.chip:active { opacity: .8; }
.chip--selected {
  background: var(--clr-primary);
  border-color: var(--clr-primary);
  color: #fff;
}
.chip--credit { border-color: #a5d6a7; color: var(--clr-positive); }
.chip--credit.chip--selected { background: var(--clr-positive); border-color: var(--clr-positive); color: #fff; }
.chip--debit  { border-color: #ef9a9a; color: var(--clr-negative); }
.chip--debit.chip--selected  { background: var(--clr-negative); border-color: var(--clr-negative); color: #fff; }

/* ── Primary button ──────────────────────────────── */
.btn-primary {
  width: 100%;
  padding: 16px;
  background: var(--clr-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1.05rem;
  font-weight: 700;
  font-family: var(--font);
  cursor: pointer;
  transition: background var(--transition), opacity var(--transition);
  min-height: 52px;
}
.btn-primary:active { background: var(--clr-primary-dk); }
.btn-primary:disabled {
  opacity: .4;
  cursor: not-allowed;
}

.btn-secondary {
  width: 100%;
  padding: 14px;
  background: transparent;
  color: var(--clr-primary);
  border: 1.5px solid var(--clr-primary);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 700;
  font-family: var(--font);
  cursor: pointer;
  min-height: 52px;
}

/* ── Transaction list ────────────────────────────── */
.tx-list {
  padding-top: 8px;
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: var(--clr-border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.tx-list__empty {
  background: var(--clr-surface);
  padding: 32px 16px;
  text-align: center;
  color: var(--clr-muted);
  font-size: 0.95rem;
}
.tx-item {
  background: var(--clr-surface);
  padding: 12px 16px;
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-rows: auto auto;
  gap: 2px 8px;
}
.tx-item__reason { font-weight: 600; font-size: 0.95rem; grid-column: 1; }
.tx-item__meta   { font-size: 0.78rem; color: var(--clr-muted); grid-column: 1; }
.tx-item__amount {
  font-size: 1.05rem;
  font-weight: 800;
  grid-column: 2;
  grid-row: 1 / 3;
  align-self: center;
  text-align: right;
  letter-spacing: -.02em;
}
.tx-item__amount--positive { color: var(--clr-positive); }
.tx-item__amount--negative { color: var(--clr-negative); }

.load-more-btn {
  display: block;
  width: 100%;
  padding: 14px;
  margin-top: 8px;
  background: var(--clr-surface);
  border: 1.5px solid var(--clr-border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--clr-primary);
  cursor: pointer;
  text-align: center;
}

/* ── Kid detail header ───────────────────────────── */
.kid-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 24px 16px 16px;
}
.kid-header__avatar  { font-size: 3.5rem; line-height: 1; }
.kid-header__name    { font-size: 1.3rem; font-weight: 700; }
.kid-header__balance {
  font-size: 2.2rem;
  font-weight: 900;
  letter-spacing: -.03em;
}

/* ── Login page ──────────────────────────────────── */
.login-page {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100dvh;
  padding: 32px 24px;
  gap: 24px;
}
.login-page__logo   { font-size: 4rem; line-height: 1; }
.login-page__title  { font-size: 1.6rem; font-weight: 800; text-align: center; }
.login-page__card   { width: 100%; max-width: 360px; background: var(--clr-surface); border-radius: var(--radius); box-shadow: var(--shadow-lg); padding: 28px 24px; display: flex; flex-direction: column; gap: 16px; }
.login-page__error  { color: var(--clr-negative); font-size: 0.9rem; text-align: center; min-height: 1.2em; }

/* ── Modal / overlay ─────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.45);
  z-index: 100;
  display: flex;
  align-items: flex-end;
  justify-content: center;
}
.modal-overlay.hidden { display: none; }
.modal {
  background: var(--clr-surface);
  border-radius: var(--radius) var(--radius) 0 0;
  padding: 24px 20px 40px;
  width: 100%;
  max-width: 480px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  box-shadow: var(--shadow-lg);
  animation: slideUp 220ms ease;
}
@keyframes slideUp { from { transform: translateY(100%); } to { transform: translateY(0); } }
.modal__title { font-size: 1.1rem; font-weight: 700; }
.modal__close {
  position: absolute;
  top: 14px;
  right: 16px;
  background: none;
  border: none;
  font-size: 1.4rem;
  cursor: pointer;
  color: var(--clr-muted);
}

/* ── Toast ───────────────────────────────────────── */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(0);
  background: #1a1a1a;
  color: #fff;
  padding: 12px 20px;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 600;
  z-index: 200;
  pointer-events: none;
  opacity: 1;
  transition: opacity 400ms ease, transform 400ms ease;
  white-space: nowrap;
}
.toast.hidden {
  opacity: 0;
  transform: translateX(-50%) translateY(12px);
}

/* ── Section headers ─────────────────────────────── */
.section-title {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .07em;
  color: var(--clr-muted);
  padding-top: 20px;
  padding-bottom: 4px;
}

/* ── Spinner ─────────────────────────────────────── */
.spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid var(--clr-border);
  border-top-color: var(--clr-primary);
  border-radius: 50%;
  animation: spin 700ms linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.loading-center {
  display: flex;
  justify-content: center;
  padding: 40px;
}

/* ── Responsive: larger screens ───────────────────── */
@media (min-width: 520px) {
  .page { padding-bottom: 48px; }
  .kids-grid { grid-template-columns: repeat(3, 1fr); }
}