* {
  box-sizing: border-box;
}

body {
  font-family: Arial, sans-serif;
  background-color: #f4f6f9;
  margin: 0;
  padding: 20px;
  color: #333;
}

h2 {
  color: #2c3e50;
  border-bottom: 2px solid #3498db;
  padding-bottom: 6px;
  margin-top: 30px;
}

.container {
  max-width: 600px;
  margin: 0 auto;
  background: white;
  padding: 30px;
  border-radius: 10px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

label {
  font-weight: bold;
  font-size: 14px;
}

input {
  width: 100%;
  padding: 10px;
  margin-top: 5px;
  border: 1px solid #ccc;
  border-radius: 5px;
  font-size: 16px;
}

input:focus {
  outline: none;
  border-color: #3498db;
}

button {
  width: 100%;
  padding: 14px;
  background-color: #3498db;
  color: white;
  border: none;
  border-radius: 5px;
  font-size: 18px;
  cursor: pointer;
  margin-top: 10px;
}

button:hover {
  background-color: #2980b9;
}
.invoice {
  margin-top: 30px;
  padding: 20px;
  border: 2px dashed #3498db;
  border-radius: 8px;
  background: #fafcff;
}

.invoice table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 10px;
}

.invoice th,
.invoice td {
  border: 1px solid #ddd;
  padding: 8px;
  text-align: left;
}

.invoice th {
  background-color: #3498db;
  color: white;
}

.invoice h3 {
  text-align: right;
  color: #2c3e50;
}
.site-header {
  background: linear-gradient(135deg, #2c3e50, #3498db);
  color: white;
  text-align: center;
  padding: 50px 20px;
  margin: -20px -20px 30px -20px;
}

.site-header .logo {
  font-size: 22px;
  font-weight: bold;
  margin-bottom: 20px;
  letter-spacing: 1px;
}

.site-header h1 {
  color: white;
  font-size: 34px;
  margin: 0 0 10px 0;
}

.site-header p {
  font-size: 17px;
  margin: 0;
  opacity: 0.9;
}
.row {
  display: flex;
  gap: 15px;
  margin-top: 15px;
}

.field {
  flex: 1;
}

@media (max-width: 500px) {
  .row {
    flex-direction: column;
    gap: 0;
  }
  .field {
    margin-bottom: 15px;
  }
}
.item-row {
  display: flex;
  gap: 10px;
  align-items: flex-end;
  margin-top: 15px;
  padding: 12px;
  background: #f8fafc;
  border-radius: 8px;
}

.item-row .item-desc {
  flex: 3;
}

.item-row .item-qty,
.item-row .item-price {
  flex: 1;
}

.remove-btn {
  width: auto;
  margin: 0;
  padding: 10px 14px;
  background-color: #e74c3c;
  font-size: 16px;
}

.remove-btn:hover {
  background-color: #c0392b;
}

.add-btn {
  background-color: #27ae60;
  margin-top: 15px;
}

.add-btn:hover {
  background-color: #1e8449;
}

@media (max-width: 500px) {
  .item-row {
    flex-direction: column;
    align-items: stretch;
  }
}
select {
  width: 100%;
  padding: 10px;
  margin-top: 5px;
  border: 1px solid #ccc;
  border-radius: 5px;
  font-size: 16px;
  background: white;
}

select:focus {
  outline: none;
  border-color: #3498db;
}
textarea {
  width: 100%;
  padding: 10px;
  margin-top: 5px;
  border: 1px solid #ccc;
  border-radius: 5px;
  font-size: 16px;
  font-family: Arial, sans-serif;
  resize: vertical;
}

textarea:focus {
  outline: none;
  border-color: #3498db;
}

.invoice .inv-top {
  background: #2c3e50;
  color: white;
  padding: 15px 20px;
  margin: -20px -20px 20px -20px;
  border-radius: 6px 6px 0 0;
}

.invoice .inv-top h2 {
  color: white;
  border: none;
  margin: 0;
  padding: 0;
  letter-spacing: 3px;
}

.invoice .totals {
  margin-top: 15px;
  text-align: right;
}

.invoice .totals p {
  margin: 4px 0;
}

.invoice .totals h3 {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 2px solid #3498db;
}

.invoice .notes {
  margin-top: 20px;
  padding: 12px;
  background: #f1f5f9;
  border-radius: 6px;
  font-size: 14px;
}
.features {
  max-width: 900px;
  margin: 50px auto 30px auto;
  text-align: center;
  padding: 0 10px;
}

.features > h2 {
  border: none;
  font-size: 28px;
}

.feature-grid {
  display: flex;
  gap: 20px;
  margin-top: 25px;
}

.feature-box {
  flex: 1;
  background: white;
  padding: 25px 20px;
  border-radius: 10px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
}

.feature-icon {
  font-size: 36px;
  margin-bottom: 10px;
}

.feature-box h3 {
  margin: 0 0 8px 0;
  color: #2c3e50;
}

.feature-box p {
  margin: 0;
  font-size: 15px;
  color: #666;
}

.site-footer {
  background: #2c3e50;
  color: white;
  text-align: center;
  padding: 25px 20px;
  margin: 40px -20px -20px -20px;
  font-size: 14px;
}

.site-footer p {
  margin: 0;
}

@media (max-width: 600px) {
  .feature-grid {
    flex-direction: column;
  }
}
@media (max-width: 500px) {
  body {
    padding: 10px;
  }

  .container {
    padding: 20px 15px;
  }

  .site-header {
    margin: -10px -10px 20px -10px;
    padding: 35px 15px;
  }

  .site-header h1 {
    font-size: 26px;
  }

  .invoice {
    padding: 15px;
    overflow-x: auto;
  }

  .invoice table {
    font-size: 13px;
  }

  .invoice th,
  .invoice td {
    padding: 6px 4px;
  }

  .site-footer {
    margin: 30px -10px -10px -10px;
  }
}
body {
  background: linear-gradient(180deg, #eaf3fc 0%, #f4f6f9 40%, #e8f0fa 100%);
}

.container {
  border-top: 5px solid #3498db;
  box-shadow: 0 6px 24px rgba(52, 152, 219, 0.18);
}

h2 {
  color: #1f6fb2;
}

.row {
  background: #f7fbff;
  padding: 12px;
  border-radius: 8px;
}

.item-row {
  background: #eef6fd;
  border: 1px solid #d6e8f7;
}

.feature-box {
  border-top: 4px solid #3498db;
}

.feature-box:nth-child(2) {
  border-top-color: #27ae60;
}

.feature-box:nth-child(3) {
  border-top-color: #e67e22;
}

.invoice {
  background: white;
  border: 2px solid #3498db;
}
.content {
  max-width: 600px;
  margin: 40px auto 0 auto;
  background: white;
  padding: 30px;
  border-radius: 10px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
  line-height: 1.7;
}

.content h2:first-child {
  margin-top: 0;
}

.content h3 {
  color: #2c3e50;
  font-size: 17px;
  margin: 20px 0 5px 0;
}

.content p {
  margin: 8px 0;
  color: #444;
}

.content ol {
  padding-left: 22px;
  color: #444;
}

.content li {
  margin-bottom: 10px;
}
details {
  border: 1px solid #d6e8f7;
  border-radius: 8px;
  margin-top: 10px;
  background: #f7fbff;
}

summary {
  padding: 14px 16px;
  font-weight: bold;
  color: #2c3e50;
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 40px;
}

summary::-webkit-details-marker {
  display: none;
}

summary::after {
  content: "+";
  position: absolute;
  right: 16px;
  font-size: 22px;
  color: #3498db;
}

details[open] summary::after {
  content: "−";
}

details[open] summary {
  border-bottom: 1px solid #d6e8f7;
}

details p {
  padding: 0 16px;
  margin: 12px 0;
}