@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&family=Space+Grotesk:wght@500;700&display=swap');

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

:root {
  --blue-900: #0a1628;
  --blue-800: #0c1e3d;
  --blue-700: #0d2b57;
  --blue-600: #1a3f7a;
  --blue-500: #2563eb;
  --blue-400: #3b82f6;
  --blue-100: #dbeafe;
  --blue-50:  #eff6ff;
  --white:    #ffffff;
  --gray-50:  #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-400: #94a3b8;
  --gray-600: #475569;
  --gray-900: #0f172a;
  --red-500:  #ef4444;
  --red-50:   #fef2f2;
  --red-100:  #fee2e2;
  --radius-sm: 6px;
  --radius:    10px;
  --radius-lg: 14px;
}

body {
  background: var(--blue-900);
  color: var(--white);
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 15px;
  line-height: 1.6;
  min-height: 100vh;
  padding: 2.5rem 1rem 4rem;
}

.app-wrapper {
  max-width: 580px;
  margin: 0 auto;
}

/* header strip */
.app-header {
  background: var(--blue-800);
  border: 1px solid var(--blue-600);
  border-radius: var(--radius-lg);
  padding: 1.5rem 1.75rem;
  margin-bottom: 1.75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

h1 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--white);
  letter-spacing: -0.02em;
}

h1 span {
  color: var(--blue-400);
}

h2 {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--gray-400);
  background: none;
  margin: 1.75rem 0 0.65rem;
}

/* add button */
#addButton {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0.5rem 1.1rem;
  background: var(--blue-500);
  color: var(--white);
  border: none;
  border-radius: var(--radius-sm);
  font-family: 'Inter', sans-serif;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
  white-space: nowrap;
}

#addButton::before {
  content: '+';
  font-size: 1.15rem;
  line-height: 1;
  font-weight: 400;
}

#addButton:hover  { background: var(--blue-400); }
#addButton:active { transform: scale(0.97); }

/* expense cards */
#displayExpense {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

#displayExpense ul {
  list-style: none;
  background: var(--white);
  border-radius: var(--radius);
  padding: 0.9rem 1.1rem;
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: center;
  column-gap: 1rem;
  row-gap: 0.4rem;
}

#displayExpense ul li {
  font-size: 0.9rem;
}

#displayExpense ul li:first-child {
  color: var(--gray-900) !important;
  font-weight: 500;
  grid-column: 1;
}

#displayExpense ul li:nth-child(2) {
  color: var(--blue-800) !important;
  background: var(--blue-100);
  font-size: 0.72rem;
  font-weight: 500;
  padding: 2px 10px;
  border-radius: 20px;
  white-space: nowrap;
  text-transform: capitalize;
}

#displayExpense ul li:nth-child(3) {
  color: var(--blue-700) !important;
  font-weight: 600;
  font-size: 0.95rem;
  white-space: nowrap;
}

#displayExpense button {
  grid-column: 1 / -1;
  margin-top: 0.3rem;
  padding: 0.3rem 0.7rem;
  background: transparent;
  border: 1px solid var(--red-500);
  color: var(--red-500);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-family: 'Inter', sans-serif;
  cursor: pointer;
  transition: background 0.15s;
  text-align: left;
}

#displayExpense button:hover {
  background: var(--red-50);
}

/* form */
#addExpenseForm {
  display: none;
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 1.5rem 1.75rem;
  margin-bottom: 1.25rem;
}

#addExpenseForm label {
  display: block;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--gray-600);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-top: 1.1rem;
  margin-bottom: 0.35rem;
}

#addExpenseForm label:first-of-type { margin-top: 0; }

#addExpenseForm input[type="text"],
#addExpenseForm input[type="number"],
#addExpenseForm select {
  width: 100%;
  padding: 0.55rem 0.85rem;
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-sm);
  color: var(--gray-900);
  font-family: 'Inter', sans-serif;
  font-size: 0.9rem;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
  appearance: auto;
}

#addExpenseForm input[type="text"]:focus,
#addExpenseForm input[type="number"]:focus,
#addExpenseForm select:focus {
  border-color: var(--blue-500);
  box-shadow: 0 0 0 3px var(--blue-50);
}

#addExpenseForm input::placeholder { color: var(--gray-400); }

#addExpenseForm select option {
  background: var(--white);
  color: var(--gray-900);
}

#addExpenseForm br { display: none; }

#addExpenseForm input[type="submit"] {
  display: block;
  width: 100%;
  margin-top: 1.35rem;
  padding: 0.65rem;
  background: var(--blue-500);
  color: var(--white);
  border: none;
  border-radius: var(--radius-sm);
  font-family: 'Inter', sans-serif;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
}

#addExpenseForm input[type="submit"]:hover  { background: var(--blue-400); }
#addExpenseForm input[type="submit"]:active { transform: scale(0.98); }

/* total */
.total-section {
  background: var(--blue-800);
  border: 1px solid var(--blue-600);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  margin-top: 0.5rem;
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
}

.total-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--gray-400);
}

#totalAmount {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.85rem;
  font-weight: 700;
  color: var(--white);
  letter-spacing: -0.02em;
}

#totalAmount::before {
  content: 'Rs ';
  font-size: 0.95rem;
  font-weight: 400;
  color: var(--blue-400);
}

/* mobile */
@media (max-width: 480px) {
  body { padding: 1.25rem 0.75rem 3rem; }
  h1   { font-size: 1.2rem; }
  .app-header { padding: 1.1rem 1.25rem; }

  #displayExpense ul {
    grid-template-columns: 1fr;
  }

  #displayExpense ul li:nth-child(2),
  #displayExpense ul li:nth-child(3) {
    justify-self: start;
  }
}