:root {
  --primary-green: #647d4f;
  --secondary-brown: #8b6c42;
  --accent-cream: #fefdf9;
  --light-green: #7a9461;
  --dark-brown: #6b5435;
  --text-dark: #2d2d2d;
  --text-light: #666;
  --border-light: #ddd;
  --shadow-light: rgba(0, 0, 0, 0.1);
  --shadow-medium: rgba(0, 0, 0, 0.15);
  --shadow-strong: rgba(0, 0, 0, 0.25);
}

* {
  box-sizing: border-box;
}

html {
  height: 100%;
  background: url("../assets/fencebackground.jpeg") center/cover no-repeat fixed;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Open Sans", sans-serif;
  line-height: 1.6;
  color: var(--text-dark);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: transparent;
  padding: 2vh 1rem;
}

.container {
  width: 100%;
  max-width: 700px;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

header {
  text-align: center;
  color: white;
  text-shadow: 2px 2px 4px var(--shadow-strong);
  margin-bottom: 1rem;
}

header h1 {
  font-family: "Merriweather", serif;
  font-size: clamp(2rem, 5vw, 3rem);
  margin: 0 0 0.5rem 0;
  color: white;
}

.subtitle {
  font-size: 1.1rem;
  margin: 0;
  opacity: 0.95;
}

.card {
  background: rgba(255, 255, 255, 0.96);
  padding: 2.5rem;
  border-radius: 1rem;
  box-shadow: 0 8px 24px var(--shadow-medium);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.calculator-selector {
  margin-bottom: 2rem;
}

.calculator-selector label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
  color: var(--secondary-brown);
}

select {
  width: 100%;
  padding: 0.75rem;
  border: 2px solid var(--secondary-brown);
  border-radius: 0.5rem;
  font-size: 1rem;
  background: white;
  color: var(--text-dark);
  cursor: pointer;
  transition: border-color 0.2s, box-shadow 0.2s;
}

select:focus {
  outline: none;
  border-color: var(--primary-green);
  box-shadow: 0 0 0 3px rgba(100, 125, 79, 0.1);
}

.calc-section {
  display: none;
  animation: fadeIn 0.3s ease-in;
}

.calc-section.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.calc-section h2 {
  font-family: "Merriweather", serif;
  color: var(--secondary-brown);
  margin: 0 0 1.5rem 0;
  font-size: 1.5rem;
  border-bottom: 2px solid var(--accent-cream);
  padding-bottom: 0.5rem;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
  color: var(--text-dark);
}

input[type="number"] {
  width: 100%;
  padding: 0.75rem;
  border: 2px solid var(--border-light);
  border-radius: 0.5rem;
  font-size: 1rem;
  background: white;
  transition: border-color 0.2s, box-shadow 0.2s;
}

input[type="number"]:focus {
  outline: none;
  border-color: var(--primary-green);
  box-shadow: 0 0 0 3px rgba(100, 125, 79, 0.1);
}

input[type="number"]:invalid {
  border-color: #e74c3c;
}

.input-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.input-group input[type="number"] {
  flex: 1;
  min-width: 100px;
}

.unit-select {
  width: auto;
  min-width: 80px;
}

.small-input {
  width: 80px !important;
  flex: none !important;
}

.per-text {
  font-weight: 600;
  color: var(--text-dark);
  white-space: nowrap;
}

.help-text {
  color: var(--text-light);
  font-size: 0.875rem;
  margin-top: 0.25rem;
  display: block;
}

.calculate-btn {
  width: 100%;
  padding: 1rem;
  background: linear-gradient(135deg, var(--primary-green), var(--light-green));
  color: white;
  border: none;
  border-radius: 0.5rem;
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-top: 1rem;
}

.calculate-btn:hover {
  background: linear-gradient(135deg, var(--secondary-brown), var(--dark-brown));
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--shadow-medium);
}

.calculate-btn:active {
  transform: translateY(0);
}

.results {
  margin-top: 1.5rem;
  padding: 1.5rem;
  background: linear-gradient(135deg, var(--accent-cream), #f8f6f0);
  border-radius: 0.5rem;
  border: 2px solid var(--primary-green);
  animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.results h3 {
  margin: 0 0 1rem 0;
  color: var(--secondary-brown);
  font-family: "Merriweather", serif;
}

.results p {
  margin: 0.5rem 0;
  font-weight: 600;
  color: var(--text-dark);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.results .result-value {
  color: var(--primary-green);
  font-size: 1.1rem;
}

footer {
  text-align: center;
  color: white;
  text-shadow: 1px 1px 2px var(--shadow-strong);
  opacity: 0.9;
  font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 768px) {
  .card {
    padding: 1.5rem;
    margin: 0 0.5rem;
  }
  
  .input-group {
    flex-direction: column;
    align-items: stretch;
  }
  
  .input-group input[type="number"],
  .unit-select,
  .small-input {
    width: 100% !important;
  }
  
  .per-text {
    text-align: center;
    padding: 0.25rem 0;
  }
}

@media (max-width: 480px) {
  body {
    padding: 1vh 0.5rem;
  }
  
  .card {
    padding: 1rem;
  }
  
  header h1 {
    font-size: 1.8rem;
  }
  
  .subtitle {
    font-size: 1rem;
  }
}

/* Print Styles */
@media print {
  html {
    background: none;
  }
  
  body {
    background: white;
    color: black;
  }
  
  .card {
    box-shadow: none;
    background: white;
  }
  
  .calculate-btn {
    display: none;
  }
}