:root {
  --green-50: #f0fdf4;
  --green-100: #dcfce7;
  --green-500: #22c55e;
  --green-600: #16a34a;
  --green-700: #15803d;
  --green-800: #166534;
  --red-500: #ef4444;
  --red-600: #dc2626;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  --amber-500: #f59e0b;
  --white: #ffffff;
  --radius: 0.5rem;
  font-family: "Nunito", system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body { background: var(--gray-50); color: var(--gray-900); }
#app { height: 100%; display: flex; flex-direction: column; }

.topbar { display: flex; justify-content: space-between; align-items: center; padding: 0.75rem 1rem; background: var(--green-600); color: var(--white); }
.topbar-inner { display: flex; justify-content: space-between; align-items: center; width: 100%; max-width: 720px; margin: 0 auto; }
.topbar-left { display: flex; align-items: center; gap: 0.5rem; }
.topbar h1 { margin: 0; font-size: 1.2rem; font-weight: 700; }
.icon-btn { background: none; border: none; color: inherit; font-size: 1.3rem; cursor: pointer; padding: 0.25rem; line-height: 1; }
.hidden { display: none !important; }

#main-content { flex: 1; overflow-y: auto; padding: 1rem; max-width: 720px; width: 100%; margin: 0 auto; }

.card { background: var(--white); border-radius: var(--radius); box-shadow: 0 1px 3px rgba(0,0,0,0.08); padding: 1rem; margin-bottom: 0.75rem; }
.card-kid { display: flex; justify-content: space-between; align-items: center; cursor: pointer; transition: box-shadow 0.15s; }
.card-kid:hover { box-shadow: 0 2px 8px rgba(0,0,0,0.12); }
.card-kid .kid-name { font-size: 1.1rem; font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; min-width: 0; }
.card-kid .kid-balance { font-size: 1.25rem; font-weight: 700; color: var(--green-700); flex-shrink: 0; margin-left: 0.75rem; }

.balance-hero { text-align: center; padding: 1.5rem 0 1rem; }
.balance-hero .label { font-size: 0.85rem; color: var(--gray-500); text-transform: uppercase; letter-spacing: 0.05em; }
.balance-hero .amount { font-size: 2.5rem; font-weight: 800; color: var(--green-700); margin: 0.25rem 0; }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 0.4rem; border: none; border-radius: var(--radius); padding: 0.6rem 1.2rem; font-size: 1rem; font-weight: 600; cursor: pointer; transition: background 0.15s; }
.btn-primary { background: var(--green-600); color: var(--white); }
.btn-primary:hover { background: var(--green-700); }
.btn-danger { background: var(--red-500); color: var(--white); }
.btn-danger:hover { background: var(--red-600); }
.btn-outline { background: var(--white); color: var(--gray-700); border: 1px solid var(--gray-300); }
.btn-outline:hover { background: var(--gray-100); }
.btn-block { width: 100%; }
.btn-group { display: flex; gap: 0.5rem; margin-bottom: 1rem; }
.btn-group .btn { flex: 1; }

.form-group { margin-bottom: 1rem; }
.form-group label { display: block; font-size: 0.85rem; font-weight: 600; color: var(--gray-700); margin-bottom: 0.3rem; }
.form-group input, .form-group select { width: 100%; padding: 0.6rem 0.75rem; border: 1px solid var(--gray-300); border-radius: var(--radius); font-size: 1rem; color: var(--gray-900); background: var(--white); }
.form-group input:focus, .form-group select:focus { outline: none; border-color: var(--green-500); box-shadow: 0 0 0 2px rgba(34, 197, 94, 0.2); }
.form-group input[type="number"] { font-variant-numeric: tabular-nums; }

.tx-list { list-style: none; margin: 0; padding: 0; }
.tx-item { display: flex; justify-content: space-between; align-items: center; padding: 0.6rem 0; border-bottom: 1px solid var(--gray-100); }
.tx-item:last-child { border-bottom: none; }
.tx-item .tx-info .tx-type { font-weight: 600; font-size: 0.9rem; text-transform: capitalize; }
.tx-item .tx-info .tx-desc { font-size: 0.8rem; color: var(--gray-500); }
.tx-item .tx-info .tx-date { font-size: 0.75rem; color: var(--gray-400); }
.tx-item .tx-amount { font-weight: 700; font-size: 1rem; white-space: nowrap; }
.tx-amount.positive { color: var(--green-600); }
.tx-amount.negative { color: var(--red-500); }

.settings-section { margin-bottom: 1.5rem; }
.settings-section h2 { font-size: 1rem; margin: 0 0 0.75rem; color: var(--gray-700); }
.radio-group { display: flex; flex-direction: column; gap: 0.4rem; }
.radio-group label { display: flex; align-items: center; gap: 0.5rem; font-size: 0.95rem; cursor: pointer; }

.empty { text-align: center; padding: 2rem 1rem; color: var(--gray-400); }
.empty p { margin: 0.5rem 0; }

.section-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 0.75rem; }
.section-header h2 { font-size: 1rem; margin: 0; color: var(--gray-700); }

.error { margin: 1rem; border: 1px solid var(--red-500); background: #fef2f2; color: var(--red-600); border-radius: var(--radius); padding: 0.8rem; }
.text-center { text-align: center; }
.mt-1 { margin-top: 1rem; }

.interest-callout { background: var(--green-50); border-radius: var(--radius); padding: 0.75rem 1rem; margin-bottom: 1rem; font-size: 0.9rem; color: var(--green-800); line-height: 1.5; }
.interest-callout p { margin: 0.25rem 0; }

.chart-container { background: var(--white); border-radius: var(--radius); box-shadow: 0 1px 3px rgba(0,0,0,0.08); padding: 0.75rem; margin-bottom: 1rem; }
.chart-container svg { width: 100%; height: auto; display: block; }
.chart-container .chart-label { font-size: 0.8rem; color: var(--gray-400); margin-bottom: 0.25rem; }
.chart-legend { display: flex; align-items: center; gap: 0.5rem; font-size: 0.75rem; color: var(--gray-500); margin-top: 0.4rem; }
.legend-line { display: inline-block; width: 1.25rem; height: 2px; vertical-align: middle; }
.legend-line.legend-solid { background: #16a34a; }
.legend-line.legend-dashed { background-image: repeating-linear-gradient(90deg, #16a34a 0, #16a34a 4px, transparent 4px, transparent 7px); background-color: transparent; }
.legend-line.legend-savings { background-image: repeating-linear-gradient(90deg, #94a3b8 0, #94a3b8 4px, transparent 4px, transparent 7px); background-color: transparent; }

.growth-details { margin-top: 0.5rem; border-top: 1px solid var(--gray-200); padding-top: 0.5rem; }
.growth-details summary { cursor: pointer; font-size: 0.85rem; font-weight: 600; color: var(--green-600); user-select: none; padding: 0.25rem 0; list-style: none; }
.growth-details summary::-webkit-details-marker { display: none; }
.growth-details summary::before { content: "\25B6\FE0E"; display: inline-block; margin-right: 0.4rem; font-size: 0.7rem; transition: transform 0.15s; }
.growth-details[open] summary::before { transform: rotate(90deg); }
.growth-details summary:hover { color: var(--green-700); }
.growth-breakdown { margin-top: 0.5rem; overflow-x: auto; }
.growth-table { width: 100%; border-collapse: collapse; font-size: 0.8rem; font-variant-numeric: tabular-nums; }
.growth-table td { padding: 0.3rem 0.5rem; border-bottom: 1px solid var(--gray-100); white-space: nowrap; }
.growth-table .right { text-align: right; }
.growth-table .positive { color: var(--green-600); }
.growth-start-row { font-weight: 600; color: var(--gray-500); }
.growth-interest-row td { border-bottom-width: 2px; border-bottom-color: var(--gray-200); }
.growth-total-row td { border-top: 2px solid var(--gray-300); border-bottom: none; padding-top: 0.5rem; font-weight: 600; }
.growth-subtotal-row td { border-bottom: none; padding-top: 0.25rem; font-size: 0.78rem; color: var(--gray-500); }

.action-btn-pair { display: flex; flex-direction: column; gap: 0.5rem; }
.action-btn-pair .btn { width: 100%; }

.contribution-bar { display: flex; justify-content: space-between; align-items: center; background: var(--white); border-radius: var(--radius); box-shadow: 0 1px 3px rgba(0,0,0,0.08); padding: 0.75rem 1rem; font-size: 0.85rem; color: var(--gray-700); }
.contribution-bar .contribution-clear { background: none; border: none; color: var(--green-600); cursor: pointer; font-size: 1.1rem; padding: 0 0.25rem; line-height: 1; }
.contribution-bar .contribution-clear:hover { color: var(--green-800); }
.contribution-form { background: var(--white); border-radius: var(--radius); box-shadow: 0 1px 3px rgba(0,0,0,0.08); padding: 1rem; margin-bottom: 1rem; min-width: 0; }
.contribution-form label { display: block; font-size: 0.85rem; font-weight: 600; color: var(--gray-700); margin-bottom: 0.4rem; }
.contribution-input-row { display: flex; gap: 0.5rem; }
.contribution-input-row input { flex: 1; min-width: 0; padding: 0.5rem 0.75rem; border: 1px solid var(--gray-300); border-radius: var(--radius); font-size: 1rem; }
.contribution-input-row input:focus { outline: none; border-color: var(--green-500); box-shadow: 0 0 0 2px rgba(34, 197, 94, 0.2); }

.goal-section { display: flex; flex-direction: column; gap: 0.75rem; margin-bottom: 1rem; min-width: 0; }
.goal-card { background: var(--white); border-radius: var(--radius); box-shadow: 0 1px 3px rgba(0,0,0,0.08); padding: 1rem; }
.goal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 0.5rem; }
.goal-header .goal-name { font-weight: 600; font-size: 0.95rem; color: var(--gray-800); }
.goal-header .goal-clear { background: none; border: none; color: var(--gray-400); cursor: pointer; font-size: 1.1rem; padding: 0 0.25rem; line-height: 1; }
.goal-header .goal-clear:hover { color: var(--gray-600); }
.thermometer { height: 1.25rem; background: var(--gray-200); border-radius: 0.625rem; overflow: hidden; position: relative; }
.thermometer-fill { height: 100%; background: var(--green-500); border-radius: 0.625rem; transition: width 0.4s ease; min-width: 0; }
.goal-progress-text { font-size: 0.8rem; color: var(--gray-500); margin-top: 0.35rem; text-align: right; }
.goal-complete-badge { display: flex; align-items: center; gap: 0.4rem; color: var(--green-600); font-weight: 700; font-size: 1rem; margin-top: 0.5rem; }
.goal-complete-badge .check { font-size: 1.2rem; }

.confetti-overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; pointer-events: none; z-index: 9999; display: flex; justify-content: center; align-items: flex-start; padding-top: 30%; }
.confetti-particle { position: absolute; width: 10px; height: 10px; border-radius: 2px; animation: confetti-burst var(--duration, 1.8s) ease-out var(--delay, 0ms) forwards; opacity: 0; }
@keyframes confetti-burst { 0% { transform: translate(0, 0) rotate(0deg) scale(1); opacity: 1; } 100% { transform: translate(var(--x, 0), var(--y, -200px)) rotate(var(--r, 360deg)) scale(0.3); opacity: 0; } }

.kid-list-item { display: flex; align-items: center; justify-content: space-between; padding: 0.6rem 0; border-bottom: 1px solid var(--gray-100); }
.kid-list-item:last-child { border-bottom: none; }
.kid-list-item .kid-list-info { display: flex; flex-direction: column; gap: 0.25rem; flex: 1; min-width: 0; }
.kid-list-item .kid-list-name { font-size: 0.95rem; font-weight: 600; }
.kid-list-item .kid-interest-day { font-size: 0.8rem; color: var(--gray-500); display: flex; align-items: center; gap: 0.35rem; flex-wrap: wrap; }
.kid-list-item .interest-day-select { padding: 0.2rem 0.35rem; border: 1px solid var(--gray-300); border-radius: var(--radius); background: var(--white); font-size: 0.8rem; color: var(--gray-800); cursor: pointer; }
.kid-list-item .interest-day-select:focus { outline: none; border-color: var(--green-500); box-shadow: 0 0 0 2px rgba(34, 197, 94, 0.2); }
.kid-list-item .kid-edit-btn { background: none; border: none; color: var(--gray-400); cursor: pointer; font-size: 0.85rem; padding: 0.2rem 0.5rem; }
.kid-list-item .kid-edit-btn:hover { color: var(--green-600); }
.kid-edit-inline { display: flex; gap: 0.5rem; align-items: center; flex: 1; }
.kid-edit-inline input { flex: 1; padding: 0.35rem 0.5rem; border: 1px solid var(--gray-300); border-radius: var(--radius); font-size: 0.9rem; }
.kid-edit-inline button { padding: 0.35rem 0.75rem; font-size: 0.8rem; }

@media (min-width: 600px) {
  #main-content { padding: 1.5rem 2rem; }
  .topbar { padding: 0.75rem 2rem; }
  .dashboard-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 0.75rem; }
  .dashboard-grid .card-kid { margin-bottom: 0; }
  .kid-detail-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; align-items: start; }
  .kid-detail-main { min-width: 0; }
  .kid-detail-sidebar { min-width: 0; }
  .balance-hero .amount { font-size: 3rem; }
  .card-kid .kid-name { font-size: 1.15rem; }
  .card-kid .kid-balance { font-size: 1.35rem; }
}