:root {
  --blue: #2563EB;
  --gray-light: #f9fafb;
  --gray-lighter: #f3f4f6;
  --gray-medium: #6b7280;
  --gray-dark: #374151;
  --black: #000000;
}
*{
  box-sizing: border-box;
  font-family: "Noto Sans", sans-serif;
}

body {
  margin: 0;
  /*font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;*/
  background: white;
  color: var(--gray-dark);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 2rem 1rem 4rem;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

h1,
h3 {
  color: var(--blue);
  margin-bottom: 0.5rem;
}

h1 {
  font-size: 2.5rem;
  font-weight: 700;
  text-align: center;
}

p,
label {
  color: var(--gray-medium);
}

p {
  text-align: center;
  margin-top: 0;
  margin-bottom: 1.5rem;
}

button {
  background-color: var(--blue);
  color: white;
  border: none;
  padding: 0.75rem 1.75rem;
  font-weight: 600;
  font-size: 1rem;
  border-radius: 0.375rem;
  cursor: pointer;
  transition: background-color 0.2s ease;
}
button:hover,
button:focus {
  background-color: #1d4ed8;
  outline: none;
}

form {
  width: 100%;
  background: #fff;
  border: 1px solid var(--gray-lighter);
  border-radius: 0.5rem;
  padding: 2rem;
  box-shadow: 0 1px 3px rgb(0 0 0 / 0.1);
  margin-bottom: 3rem;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.mb-6 {
  margin-bottom: 1.5rem;
}

label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.3rem;
}

input[type="text"],
input[type="number"],
input[type="date"],
textarea,
select {
  width: 100%;
  border: 1px solid var(--gray-lighter);
  border-radius: 0.375rem;
  padding: 0.5rem 0.75rem;
  font-size: 1rem;
  font-family: inherit;
  color: var(--gray-dark);
  resize: vertical;
  box-sizing: border-box;
  transition: border-color 0.2s ease;
}

input[type="file"] {
  font-size: 0.9rem;
}

input[type="text"]:focus,
input[type="number"]:focus,
input[type="date"]:focus,
textarea:focus,
select:focus {
  border-color: var(--blue);
  outline: none;
  box-shadow: 0 0 0 2px rgb(37 99 235 / 0.3);
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 0.75rem;
  font-size: 0.95rem;
}

thead {
  background-color: var(--blue);
  color: white;
}

th,
td {
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--gray-lighter);
}

th {
  font-weight: 700;
  text-align: left;
}

td input[type="text"],
td input[type="number"] {
  border: none;
  padding: 0;
  width: 100%;
  font-size: 0.95rem;
  font-family: inherit;
  color: var(--gray-dark);
  background: transparent;
  text-align: left;
}

td input[type="number"] {
  text-align: right;
}

td input[type="number"]:focus,
td input[type="text"]:focus {
  outline: none;
  background-color: var(--gray-light);
  border-radius: 0.25rem;
}

td.total-cell {
  font-weight: 600;
  text-align: right;
  background: var(--gray-lighter);
  user-select: none;
}

.add-item-btn {
  margin-top: 0.75rem;
  padding: 0.5rem 1rem;
  font-size: 0.95rem;
  border-radius: 0.375rem;
  background-color: var(--blue);
  color: white;
  border: none;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

.add-item-btn:hover,
.add-item-btn:focus {
  background-color: #1d4ed8;
  outline: none;
}

.custom-fields-container > div {
  margin-bottom: 1rem;
}

.custom-fields-add {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.5rem;
  max-width: 400px;
}

.custom-fields-add input {
  flex-grow: 1;
}
.custom-fields-add button {
  flex-shrink: 0;
  padding: 0.5rem 1rem;
  font-size: 0.95rem;
  border-radius: 0.375rem;
  background-color: var(--blue);
  color: white;
  border: none;
  cursor: pointer;
  transition: background-color 0.2s ease;
}
.custom-file-upload {
  display: inline-block;
  padding: 10px 20px;
  cursor: pointer;
  background: #007bff;
  color: white;
  border-radius: 8px;
  font-family: Arial, sans-serif;
  transition: 0.3s;
  position: relative;
}

.custom-file-upload:hover {
  background: #0056b3;
}
#company-logo-preview {
  margin-top: 0.75rem;
  max-height: 60px;
  object-fit: contain;
  border: 1px solid var(--gray-lighter);
  border-radius: 0.375rem;
  padding: 4px;
  background: var(--gray-light);
}

footer {
  color: var(--gray-medium);
  font-size: 0.875rem;
  user-select: none;
  text-align: center;
  width: 100%;
  max-width: 900px;
}

.separator {
  border: none;
  border-top: 1px solid var(--gray-lighter);
  margin: 2rem 0;
}

.totals-container {
  max-width: 400px;
  margin-left: auto;
  margin-bottom: 1.5rem;
}

.totals-row {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.3rem;
  font-size: 1rem;
}

.total-bold {
  font-weight: 700;
  font-size: 1.15rem;
  margin-top: 0.5rem;
  border-top: 1px solid var(--gray-lighter);
  padding-top: 0.5rem;
}

.balance-due {
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--blue);
  margin-top: 0.3rem;
}

@media (max-width: 640px) {
  .grid-2 {
    grid-template-columns: 1fr;
  }

  .totals-container {
    max-width: 100%;
  }
}