:root {
  --primary-color: #2E7D32;
  --secondary-color: #4CAF50;
  --accent-color: #8BC34A;
  --light-color: #F1F8E9;
  --dark-color: #1B5E20;
  --text-color: #333;
  --white: #FFFFFF;
  --error-color: #D32F2F;
  --success-color: #388E3C;
  --warning-color: #FFA000;
  --info-color: #1976D2;
}

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

body {
  font-family: 'Kanit', sans-serif;
  background-color: #f5f5f5;
  color: var(--text-color);
  line-height: 1.6;
}

.app-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
}

.app-header {
  background-color: var(--primary-color);
  color: var(--white);
  padding: 20px;
  border-radius: 8px;
  margin-bottom: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.logo-container {
  display: flex;
  align-items: center;
  gap: 15px;
}

.logo {
  height: 50px;
  width: auto;
}

.app-header h1 {
  font-size: 1.8rem;
  font-weight: 500;
  margin: 0;
}

.header-controls {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 10px;
}

.current-date {
  background-color: var(--dark-color);
  padding: 8px 15px;
  border-radius: 20px;
  font-size: 0.9rem;
}

.nav-menu {
  display: flex;
  gap: 10px;
}

.nav-link {
  color: var(--white);
  text-decoration: none;
  padding: 8px 15px;
  border-radius: 4px;
  transition: background-color 0.3s;
  font-size: 0.9rem;
}

.nav-link:hover {
  background-color: var(--dark-color);
}

.nav-link.active {
  background-color: var(--dark-color);
  font-weight: bold;
}

.content-wrapper {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.form-section {
  flex: 1;
  min-width: 300px;
}

.sales-history {
  flex: 2;
  min-width: 300px;
}

.form-card, .calculator-card {
  background-color: var(--white);
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 20px;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.card-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
  color: var(--primary-color);
  position: relative;
}

.card-header h2 {
  font-size: 1.3rem;
  font-weight: 500;
  margin: 0;
}

.export-btn {
  position: absolute;
  right: 0;
  background-color: var(--accent-color);
  color: var(--white);
  border: none;
  border-radius: 4px;
  padding: 8px 12px;
  font-family: 'Kanit', sans-serif;
  cursor: pointer;
  transition: background-color 0.3s;
  display: flex;
  align-items: center;
  gap: 5px;
}

.export-btn:hover {
  background-color: var(--secondary-color);
}

.form-row {
  display: flex;
  gap: 15px;
  margin-bottom: 15px;
  flex-wrap: wrap;
}

.form-group {
  flex: 1;
  min-width: 200px;
}

label {
  display: block;
  margin-bottom: 8px;
  font-weight: 400;
  color: var(--dark-color);
}

input, select {
  width: 100%;
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-family: 'Kanit', sans-serif;
  font-size: 1rem;
}

input:focus, select:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 2px rgba(139, 195, 74, 0.2);
}

.output-box {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px;
  background-color: var(--light-color);
  border-radius: 4px;
  margin-top: 15px;
  font-size: 1.1rem;
}

.output-box span {
  color: var(--dark-color);
}

.output-box strong {
  color: var(--primary-color);
  font-size: 1.2rem;
}

.revenue {
  border-left: 4px solid var(--success-color);
}

.expense {
  border-left: 4px solid var(--error-color);
}

.balance {
  border-left: 4px solid var(--info-color);
}

.submit-btn {
  width: 100%;
  padding: 12px;
  background-color: var(--primary-color);
  color: var(--white);
  border: none;
  border-radius: 4px;
  font-family: 'Kanit', sans-serif;
  font-size: 1rem;
  cursor: pointer;
  margin-top: 20px;
  transition: background-color 0.3s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.submit-btn:hover {
  background-color: var(--dark-color);
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 20px;
}

th, td {
  padding: 12px 15px;
  text-align: left;
  border-bottom: 1px solid #ddd;
}

th {
  background-color: var(--light-color);
  color: var(--dark-color);
  font-weight: 500;
}

tr:hover {
  background-color: #f9f9f9;
}

.no-data {
  text-align: center;
  color: #777;
  padding: 20px;
}

.delete-btn {
  background: none;
  border: none;
  color: var(--error-color);
  cursor: pointer;
  font-size: 1rem;
  padding: 5px;
}

.delete-btn:hover {
  color: #B71C1C;
}

.msg-box {
  padding: 15px;
  margin-top: 20px;
  border-radius: 4px;
  text-align: center;
  display: none;
}

/* สไตล์สำหรับหน้า calculator */
.calculator-section {
  width: 100%;
}

.input-group {
  margin-bottom: 20px;
}

.input-group label {
  display: flex;
  align-items: center;
  gap: 8px;
}

.button-group {
  display: flex;
  gap: 15px;
  margin: 25px 0;
}

.btn-calculate, .btn-reset {
  flex: 1;
  padding: 12px;
  border: none;
  border-radius: 4px;
  font-family: 'Kanit', sans-serif;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.3s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.btn-calculate {
  background-color: var(--primary-color);
  color: var(--white);
}

.btn-calculate:hover {
  background-color: var(--dark-color);
}

.btn-reset {
  background-color: #f5f5f5;
  color: var(--text-color);
  border: 1px solid #ddd;
}

.btn-reset:hover {
  background-color: #e0e0e0;
}

.result-container {
  background-color: var(--white);
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
  margin-top: 20px;
  display: none;
}

.result-container h3 {
  color: var(--primary-color);
  margin-bottom: 15px;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.result-section {
  background-color: var(--light-color);
  padding: 15px;
  border-radius: 4px;
  margin-bottom: 15px;
}

.result-section h4 {
  color: var(--dark-color);
  margin-bottom: 10px;
  font-size: 1rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.result-item {
  display: flex;
  justify-content: space-between;
  margin-bottom: 8px;
}

.result-item span {
  color: var(--text-color);
}

.result-item strong {
  color: var(--primary-color);
}

.note {
  margin-top: 20px;
  padding: 10px;
  background-color: #FFF9C4;
  border-left: 4px solid #FFD600;
  font-size: 0.9rem;
  color: #5D4037;
}

.note i {
  color: #FFA000;
}

/* Responsive Design */
@media (max-width: 768px) {
  .app-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 15px;
  }
  
  .header-controls {
    align-items: flex-start;
    width: 100%;
  }
  
  .nav-menu {
    width: 100%;
    flex-wrap: wrap;
  }
  
  .form-row {
    flex-direction: column;
    gap: 15px;
  }
  
  .form-group {
    width: 100%;
  }
  
  table {
    display: block;
    overflow-x: auto;
  }
  
  .content-wrapper {
    flex-direction: column;
  }
}