:root {
  --bg: #0f172a;
  --panel: #1e293b;
  --panel2: #334155;
  --text: #f1f5f9;
  --muted: #94a3b8;
  --accent: #22c55e;
  --accent-dim: #16a34a;
  --danger: #ef4444;
  --border: #334155;
  --radius: 12px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  font-size: 15px;
  line-height: 1.5;
}

.hidden { display: none !important; }

/* Login */
#login-screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}
.login-box {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2rem;
  width: 100%;
  max-width: 340px;
  text-align: center;
}
.login-box h1 { font-size: 1.4rem; margin-bottom: 0.5rem; }
.login-box input {
  width: 100%;
  margin: 1rem 0;
  padding: 0.7rem 0.85rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 1rem;
}
.login-box .error { color: var(--danger); font-size: 0.9rem; margin-top: 0.75rem; }

#app {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 220px;
  background: var(--panel);
  border-right: 1px solid var(--border);
  padding: 1.25rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  flex-shrink: 0;
}

.brand {
  font-weight: 700;
  font-size: 1.05rem;
  margin-bottom: 1.5rem;
  padding: 0 0.5rem;
}

.nav-btn {
  background: transparent;
  border: none;
  color: var(--muted);
  text-align: left;
  padding: 0.65rem 0.75rem;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.95rem;
  transition: all 0.15s;
}

.nav-btn:hover { background: var(--panel2); color: var(--text); }
.nav-btn.active { background: var(--accent-dim); color: white; font-weight: 600; }

.content {
  flex: 1;
  padding: 1.75rem 2rem;
  overflow-y: auto;
  max-width: 960px;
}

.page { display: none; }
.page.active { display: block; }

.page-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1.5rem;
  gap: 1rem;
  flex-wrap: wrap;
}

h1 { font-size: 1.5rem; font-weight: 700; letter-spacing: -0.02em; }
h2 { font-size: 1.1rem; margin-bottom: 0.75rem; }
h3 { font-size: 1rem; margin-bottom: 0.5rem; }

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

.leftover-card {
  background: linear-gradient(135deg, #1e293b, #0f172a);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem 1.75rem;
  margin-bottom: 1.5rem;
}

.leftover-card .label { color: var(--muted); font-size: 0.85rem; margin-bottom: 0.25rem; }
.leftover-card .amount { font-size: 2.4rem; font-weight: 700; }
.leftover-card .amount.positive { color: var(--accent); }
.leftover-card .amount.negative { color: var(--danger); }
.leftover-card .sub { color: var(--muted); font-size: 0.85rem; margin-top: 0.4rem; }

.metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 0.75rem;
  margin-bottom: 1.75rem;
}

.metric {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.85rem 1rem;
}
.metric .label { color: var(--muted); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.04em; }
.metric .value { font-size: 1.15rem; font-weight: 600; margin-top: 0.2rem; }

.section { margin-bottom: 2rem; }

.list, #pending-list, #paid-list, #auto-items, #past-txns, #search-results {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.75rem 1rem;
}

.item .date { color: var(--muted); width: 70px; flex-shrink: 0; font-size: 0.9rem; }
.item .name { flex: 1; font-weight: 500; }
.item .cat { color: var(--muted); font-size: 0.8rem; }
.item .amount { font-weight: 600; width: 90px; text-align: right; }
.item .actions { display: flex; gap: 0.4rem; }

.btn {
  border: none;
  border-radius: 8px;
  padding: 0.5rem 0.9rem;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: filter 0.15s;
}
.btn:hover { filter: brightness(1.08); }
.btn.primary { background: var(--accent); color: #052e16; }
.btn.secondary { background: var(--panel2); color: var(--text); }
.btn.danger { background: var(--danger); color: white; }
.btn.full { width: 100%; padding: 0.75rem; margin-top: 0.75rem; }
.btn.small { padding: 0.35rem 0.65rem; font-size: 0.8rem; }

.form-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  max-width: 520px;
}

label {
  display: block;
  font-size: 0.8rem;
  color: var(--muted);
  margin-bottom: 0.85rem;
}

input, select {
  display: block;
  width: 100%;
  margin-top: 0.3rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.55rem 0.7rem;
  color: var(--text);
  font-size: 0.95rem;
}

input:focus, select:focus {
  outline: none;
  border-color: var(--accent);
}

.row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.search-input {
  width: 100%;
  max-width: 400px;
  margin-bottom: 1rem;
  padding: 0.65rem 0.85rem;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 1rem;
}

.modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
}
.modal.hidden { display: none; }
.modal-content {
  background: var(--panel);
  border-radius: var(--radius);
  padding: 1.75rem;
  width: 90%;
  max-width: 420px;
  border: 1px solid var(--border);
}
.modal-actions {
  display: flex;
  gap: 0.5rem;
  margin-top: 1.25rem;
}

@media (max-width: 700px) {
  #app { flex-direction: column; }
  .sidebar { width: 100%; flex-direction: row; overflow-x: auto; padding: 0.75rem; flex-wrap: wrap; }
  .brand { display: none; }
  .nav-btn { white-space: nowrap; }
  .content { padding: 1.25rem 1rem; }
  .row { grid-template-columns: 1fr; }
}