:root {
  --bg: #eef1f7;
  --card: rgba(255,255,255,0.65);
  --text: #1e293b;
  --muted: #64748b;
  --accent: #6366f1;
  --accent-light: #818cf8;
  --danger: #ef4444;
  --success: #22c55e;
  --border: rgba(0,0,0,0.08);
  --glass: rgba(255,255,255,0.45);
}

body.dark {
  --bg: #0f172a;
  --card: rgba(30,41,59,0.55);
  --text: #f1f5f9;
  --muted: #94a3b8;
  --accent: #818cf8;
  --accent-light: #a5b4fc;
  --danger: #f87171;
  --success: #4ade80;
  --border: rgba(255,255,255,0.1);
  --glass: rgba(30,41,59,0.45);
}

* {
  box-sizing: border-box;
  font-family: "Tajawal", sans-serif;
}

body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  display: flex;
  justify-content: center;
  min-height: 100vh;
  transition: background 0.3s ease, color 0.3s ease;
}

.app {
  width: 100%;
  max-width: 520px;
  padding: 1.5rem;
}

.card {
  background: var(--card);
  backdrop-filter: blur(18px);
  border-radius: 1.4rem;
  padding: 1.5rem;
  border: 1px solid var(--border);
  box-shadow: 0 18px 40px rgba(0,0,0,0.08);
  animation: fadeIn 0.6s ease;
  transition: background 0.3s ease, border 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.header-buttons {
  display: flex;
  gap: 0.5rem;
}

.title {
  font-size: 1.5rem;
  font-weight: 700;
}

.subtitle {
  font-size: 0.85rem;
  color: var(--muted);
}

.toggle-theme,
.toggle-lang {
  border-radius: 999px;
  border: 1px solid var(--border);
  padding: 0.45rem 0.9rem;
  background: var(--glass);
  cursor: pointer;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  gap: 0.3rem;
  transition: 0.2s;
}

.toggle-theme:hover,
.toggle-lang:hover {
  transform: translateY(-2px);
  background: rgba(255,255,255,0.2);
}

.balance-card {
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  color: #fff;
  border-radius: 1.4rem;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 12px 30px rgba(99,102,241,0.35);
}

.balance-label {
  font-size: 0.9rem;
  opacity: 0.9;
}

.balance-value {
  font-size: 2rem;
  font-weight: 700;
  margin-top: 0.3rem;
}

.summary {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
}

.summary-item {
  flex: 1;
}

.summary-label {
  font-size: 0.8rem;
  opacity: 0.9;
}

.summary-value {
  font-size: 1.1rem;
  font-weight: 600;
}

.summary-value.income { color: #bbf7d0; }
.summary-value.expense { color: #fecaca; }

.form {
  display: grid;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

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

.field input,
.field select {
  border-radius: 0.9rem;
  border: 1px solid var(--border);
  padding: 0.7rem 0.9rem;
  font-size: 0.95rem;
  background: var(--glass);
  color: var(--text);
  transition: 0.2s;
}

.field input:focus,
.field select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(99,102,241,0.25);
}

.actions {
  display: flex;
  gap: 1rem;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  border-radius: 999px;
  padding: 0.7rem;
  border: none;
  font-size: 0.95rem;
  cursor: pointer;
  transition: 0.2s;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 25px rgba(99,102,241,0.35);
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.7rem;
  cursor: pointer;
  transition: 0.2s;
}

.btn-outline:hover {
  background: rgba(148,163,184,0.1);
}

.transactions-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.transactions {
  max-height: 260px;
  overflow-y: auto;
}

.transaction {
  display: flex;
  justify-content: space-between;
  padding: 0.8rem 0.4rem;
  border-bottom: 1px dashed var(--border);
  font-size: 0.9rem;
}

.transaction-amount.income { color: var(--success); }
.transaction-amount.expense { color: var(--danger); }

.transaction-delete {
  background: rgba(239,68,68,0.1);
  color: var(--danger);
  border: none;
  border-radius: 0.6rem;
  padding: 0.3rem 0.6rem;
  cursor: pointer;
  transition: 0.2s;
}

.transaction-delete:hover {
  background: rgba(239,68,68,0.2);
  transform: translateY(-2px);
}

.empty {
  text-align: center;
  color: var(--muted);
  margin-top: 1rem;
  font-size: 0.85rem;
}