:root {
  --green: #1f9d55;
  --green-dark: #157a40;
  --ink: #16241c;
  --muted: #6b7c72;
  --bg: #f3f6f4;
  --card: #ffffff;
  --line: #e3eae5;
  --danger: #c0392b;
  --radius: 14px;
  --shadow: 0 6px 22px rgba(20, 60, 35, 0.08);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  color: var(--ink);
  background:
    radial-gradient(1100px 380px at 80% -8%, #d9f2e3 0%, transparent 60%),
    var(--bg);
  min-height: 100vh;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  background: linear-gradient(120deg, var(--green-dark), var(--green));
  color: #fff;
}
.brand { font-weight: 700; letter-spacing: .2px; }
.bolt { filter: drop-shadow(0 1px 1px rgba(0,0,0,.2)); }

.wrap {
  max-width: 460px;
  margin: 0 auto;
  padding: 20px 16px 60px;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  margin-bottom: 16px;
}

h1 { font-size: 22px; margin: 0 0 4px; }
h2 { font-size: 16px; margin: 0 0 12px; }

label {
  display: block;
  font-size: 13px;
  color: var(--muted);
  margin: 12px 0 6px;
}

input {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  font-size: 16px;
  outline: none;
  background: #fbfdfc;
}
input:focus { border-color: var(--green); box-shadow: 0 0 0 3px rgba(31,157,85,.15); }

button {
  cursor: pointer;
  border: none;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  padding: 12px 16px;
}
.primary { background: var(--green); color: #fff; width: 100%; margin-top: 16px; }
.primary:hover { background: var(--green-dark); }
.ghost { background: #eef4f0; color: var(--green-dark); }
.ghost:hover { background: #e1ece6; }

.link { color: var(--green-dark); font-size: 13px; cursor: pointer; text-decoration: none; }
.link:hover { text-decoration: underline; }

.row-between { display: flex; justify-content: space-between; align-items: center; margin-top: 12px; }

.muted { color: var(--muted); font-size: 13px; }
.strong, .info .strong { font-weight: 600; }

.msg { font-size: 13px; margin-top: 12px; min-height: 18px; }
.msg.error { color: var(--danger); }
.msg.ok { color: var(--green-dark); }

.info {
  background: #eef7f1;
  border: 1px solid #d4eadd;
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 13px;
  margin-top: 8px;
}

.hidden { display: none !important; }

/* Balance card */
.balance-card { text-align: center; background: linear-gradient(135deg, #ffffff, #eef9f1); }
.balance-label { color: var(--muted); font-size: 13px; }
.balance-value { font-size: 42px; font-weight: 800; color: var(--green-dark); margin: 6px 0; }
.balance-value .unit { font-size: 18px; font-weight: 600; color: var(--muted); }
.meter-meta { color: var(--muted); font-size: 13px; }
.pill {
  display: inline-block;
  margin-top: 10px;
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
}
.pill.on { background: #def3e4; color: var(--green-dark); }
.pill.off { background: #fbe3e0; color: var(--danger); }

/* Transactions */
.txn-list { display: flex; flex-direction: column; gap: 8px; }
.txn {
  display: flex; justify-content: space-between; align-items: center;
  padding: 10px 12px; border: 1px solid var(--line); border-radius: 10px;
}
.txn .date { color: var(--muted); font-size: 12px; }
.txn .amt { font-weight: 700; }
.txn .amt.pos { color: var(--green-dark); }
.txn .amt.neg { color: var(--danger); }