* { box-sizing: border-box; }

html {
  background: radial-gradient(circle at 25% 15%, #1e1b3a 0%, #0a0a12 55%);
  min-height: 100vh;
  color-scheme: dark;
}

body {
  font-family: "Inter", system-ui, sans-serif;
  color: #e6e4f0;
  max-width: 620px;
  margin: 40px auto;
  padding: 28px;
  background: #13131f;
  border: 1px solid #262637;
  border-radius: 20px;
  box-shadow: 0 0 60px rgba(139, 92, 246, 0.18);
}

h1 {
  text-align: center;
  margin-bottom: 24px;
  font-weight: 700;
  background: linear-gradient(135deg, #a855f7, #22d3ee);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 0 14px rgba(139, 92, 246, 0.55));
}

/* ---- Ταμπλό ---- */
#summary { margin-bottom: 28px; }

#balance-card {
  background: linear-gradient(135deg, #7c3aed 0%, #6366f1 55%, #0891b2 100%);
  color: #fff;
  border-radius: 18px;
  padding: 28px 20px;
  text-align: center;
  box-shadow: 0 0 45px rgba(124, 58, 237, 0.55);
  margin-bottom: 14px;
}

#balance-card p {
  margin: 0 0 6px 0;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 1px;
  opacity: 0.9;
}

#balance-card span { font-size: 42px; font-weight: 700; }

#sub-summary { display: flex; gap: 14px; }

.sub-item {
  flex: 1;
  background: #1a1a29;
  border: 1px solid #2a2a3e;
  border-radius: 14px;
  padding: 14px;
  text-align: center;
}

.sub-item p { margin: 0 0 4px 0; font-size: 13px; color: #8b88a3; }
.sub-item span { font-size: 22px; font-weight: 600; }
.income span { color: #34d399; text-shadow: 0 0 10px rgba(52, 211, 153, 0.4); }
.expense span { color: #fb7185; text-shadow: 0 0 10px rgba(251, 113, 133, 0.4); }

.savings span {
  color: #fbbf24;
  text-shadow: 0 0 10px rgba(251, 191, 36, 0.4);
}

/* Τα τρία κουτάκια να αναπνέουν καλύτερα */
#sub-summary { flex-wrap: wrap; }
.sub-item { flex: 1 1 100px; }
.sub-item span { font-size: 20px; }

/* ---- Φόρμα ---- */
#transaction-form {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 22px;
}

#transaction-form input,
#transaction-form select {
  flex: 1 1 140px;
  padding: 12px 14px;
  background: #1a1a29;
  color: #e6e4f0;
  border: 1px solid #2f2f45;
  border-radius: 10px;
  font-size: 14px;
  font-family: inherit;
  transition: border-color 0.2s, box-shadow 0.2s;
}

#transaction-form input::placeholder { color: #6b6880; }

#transaction-form input:focus,
#transaction-form select:focus {
  outline: none;
  border-color: #8b5cf6;
  box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.25);
}

#transaction-form button {
  flex: 1 1 100%;
  padding: 14px;
  background: linear-gradient(135deg, #7c3aed, #6366f1);
  color: white;
  border: none;
  border-radius: 10px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s;
  box-shadow: 0 0 20px rgba(124, 58, 237, 0.35);
}

#transaction-form button:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 32px rgba(124, 58, 237, 0.7);
}

/* ---- Φίλτρο ---- */
#filter {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 22px;
  font-size: 14px;
  color: #9490ab;
}

#filter input {
  padding: 9px;
  background: #1a1a29;
  color: #e6e4f0;
  border: 1px solid #2f2f45;
  border-radius: 10px;
  font-family: inherit;
}

#filter button {
  padding: 9px 16px;
  background: #241f3d;
  color: #c4b5fd;
  border: 1px solid #3a3160;
  border-radius: 10px;
  cursor: pointer;
  font-family: inherit;
  transition: background 0.2s, box-shadow 0.2s;
}

#filter button:hover {
  background: #2e2650;
  box-shadow: 0 0 16px rgba(139, 92, 246, 0.4);
}

/* ---- Λίστα ---- */
#transaction-list { list-style: none; padding: 0; margin: 0 0 28px 0; }

#transaction-list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 16px;
  background: #1a1a29;
  border: 1px solid #2a2a3e;
  border-radius: 12px;
  margin-bottom: 9px;
  font-size: 14px;
  animation: slideIn 0.25s ease;
}

@keyframes slideIn {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}

#transaction-list button {
  background: #3a1f28;
  color: #fb7185;
  border: none;
  border-radius: 8px;
  width: 30px;
  height: 30px;
  cursor: pointer;
  font-size: 14px;
  flex-shrink: 0;
  margin-left: 12px;
  transition: background 0.2s, box-shadow 0.2s;
}

#transaction-list button:hover {
  background: #4d2733;
  box-shadow: 0 0 14px rgba(251, 113, 133, 0.5);
}

#transaction-form select:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

#period-label {
  text-align: center;
  margin: -14px 0 26px 0;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: #a78bfa;
  text-shadow: 0 0 12px rgba(167, 139, 250, 0.4);
}

@media (max-width: 640px) {
  body {
    margin: 12px auto;
    padding: 18px;
  }
  #balance-card span { font-size: 34px; }
}