:root {
  --accent: #1E7A5F;
  --accent-dark: #145C46;
  --bg: #F4F6F5;
  --card-bg: #FFFFFF;
  --text: #1B2B26;
  --muted: #6B7A75;
  --border: #DFE6E3;
  --danger: #B3261E;
  --radius: 14px;
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  -webkit-tap-highlight-color: transparent;
}

.screen {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ---- PIN screen ---- */
#pinScreen {
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.pin-box {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 32px 24px;
  max-width: 340px;
  width: 100%;
  text-align: center;
  box-shadow: 0 4px 20px rgba(0,0,0,0.06);
}

.pin-box h1 { margin: 0 0 4px; font-size: 1.4rem; }

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

.link-btn {
  background: none;
  border: none;
  color: var(--accent-dark);
  font-size: 0.78rem;
  font-weight: 500;
  cursor: pointer;
  padding: 0;
  float: right;
}

#pinInput {
  width: 100%;
  font-size: 1.8rem;
  text-align: center;
  letter-spacing: 0.4em;
  padding: 12px;
  margin: 20px 0;
  border: 2px solid var(--border);
  border-radius: 10px;
}

/* ---- Top bar & tabs ---- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  background: var(--accent);
  color: white;
  position: sticky;
  top: 0;
  z-index: 10;
}

.topbar h1 { font-size: 1.1rem; margin: 0; }

.who-badge {
  font-size: 0.85rem;
  background: rgba(255,255,255,0.2);
  padding: 4px 10px;
  border-radius: 999px;
}

.icon-btn {
  background: none;
  border: none;
  color: white;
  font-size: 1.3rem;
  cursor: pointer;
  padding: 4px 8px;
}

.tabs {
  display: flex;
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 52px;
  z-index: 9;
}

.tab-btn {
  flex: 1;
  padding: 14px;
  background: none;
  border: none;
  font-size: 1rem;
  color: var(--muted);
  border-bottom: 3px solid transparent;
  cursor: pointer;
}

.tab-btn.active {
  color: var(--accent-dark);
  border-bottom-color: var(--accent);
  font-weight: 600;
}

main {
  flex: 1;
  padding: 16px;
  max-width: 480px;
  width: 100%;
  margin: 0 auto;
  padding-bottom: 80px;
}

.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ---- Form fields ---- */
.field-group {
  margin-bottom: 20px;
}

.field-group label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 8px;
}

.chi-buttons {
  display: flex;
  gap: 10px;
}

.chi-btn {
  flex: 1;
  padding: 14px;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  background: var(--card-bg);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
}

.chi-btn.selected {
  border-color: var(--accent);
  background: #E7F3EF;
  color: var(--accent-dark);
}

.amount-input {
  width: 100%;
  font-size: 2rem;
  font-weight: 700;
  padding: 14px;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  text-align: center;
}

#cosaSearch {
  width: 100%;
  font-size: 1rem;
  padding: 12px 14px;
  border: 2px solid var(--border);
  border-radius: var(--radius);
}

.cosa-list {
  margin-top: 8px;
  max-height: 260px;
  overflow-y: auto;
  border-radius: var(--radius);
}

.cosa-item {
  padding: 12px 14px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-top: none;
  cursor: pointer;
  font-size: 0.95rem;
}

.cosa-item:first-child { border-top: 1px solid var(--border); border-radius: var(--radius) var(--radius) 0 0; }
.cosa-item:last-child { border-radius: 0 0 var(--radius) var(--radius); }

.cosa-item .cat {
  display: block;
  font-size: 0.75rem;
  color: var(--muted);
}

.cosa-item.selected {
  background: #E7F3EF;
  border-color: var(--accent);
}

.btn {
  display: block;
  width: 100%;
  padding: 14px;
  border-radius: var(--radius);
  border: none;
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
}

.btn.primary {
  background: var(--accent);
  color: white;
}

.btn.primary:disabled {
  background: #A9C9BF;
  cursor: not-allowed;
}

.btn.big { padding: 18px; font-size: 1.15rem; }

.btn.ghost {
  background: none;
  border: 2px solid var(--border);
  color: var(--text);
  margin-top: 12px;
}

.feedback {
  margin-top: 16px;
  padding: 12px 14px;
  border-radius: var(--radius);
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.feedback.success { background: #E7F3EF; color: var(--accent-dark); }
.feedback.error { background: #FBEAEA; color: var(--danger); }

.feedback-action {
  background: none;
  border: none;
  font-weight: 700;
  font-size: 0.95rem;
  color: inherit;
  text-decoration: underline;
  cursor: pointer;
  padding: 0;
  white-space: nowrap;
}

.queue-box {
  margin-top: 12px;
  padding: 10px 14px;
  border-radius: var(--radius);
  background: #FFF0F0;
  font-size: 0.9rem;
}

/* ---- Summary ---- */

.month-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.month-nav-btn {
  width: 44px;
  height: 44px;
  border-radius: 999px;
  border: 2px solid var(--border);
  background: var(--card-bg);
  font-size: 1.1rem;
  cursor: pointer;
  color: var(--text);
}

.month-nav-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.month-nav-label {
  font-weight: 700;
  font-size: 1.05rem;
  text-transform: capitalize;
}

.summary-total {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
  margin-bottom: 16px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.04);
}

.summary-total .amount { font-size: 2rem; font-weight: 700; color: var(--accent-dark); }

.cat-row {
  display: flex;
  justify-content: space-between;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
}

.cat-row .cat-name { font-weight: 600; }
.cat-row .cat-amounts { color: var(--muted); }

.error { color: var(--danger); font-size: 0.9rem; }