/* === Global Styles & Variables === */
:root {
  --primary-color: #C9FF00; /* สีเขียวมะนาว */
  --dark-bg: #171717;
  --light-bg: #222222;
  --text-color: #FFFFFF;
  --text-muted: #AAAAAA;
  --border-radius: 12px;
}

body {
  font-family: 'Sarabun', sans-serif;
  background-color: var(--dark-bg);
  color: var(--text-color);
  margin: 0;
  padding-bottom: 80px; /* Space for navbar */
}

.container {
  max-width: 960px;
  margin: 20px auto;
  padding: 0 15px;
}

h1, h2, h3 {
  color: var(--primary-color);
  text-align: center;
}

a {
  color: var(--primary-color);
  text-decoration: none;
}

/* === Back Button === */
.back-btn {
  position: absolute;
  top: 15px;
  left: 15px;
  background: var(--light-bg);
  color: var(--text-color);
  border: none;
  border-radius: 8px;
  padding: 8px 14px;
  cursor: pointer;
  z-index: 1000;
  font-size: 16px;
}

/* === Product Grid & Cards (track.html) === */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.product-card {
  background-color: var(--light-bg);
  border-radius: var(--border-radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.product-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 25px rgba(201, 255, 0, 0.1);
}

.product-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.product-info {
  padding: 20px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.product-info h3 {
  margin-top: 0;
  text-align: left;
  font-size: 1.2rem;
}

.product-specs {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.5;
  flex-grow: 1;
  margin-bottom: 15px;
}

.product-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: auto;
}

.product-price {
  font-size: 1.1rem;
  font-weight: bold;
  color: var(--text-color);
}

.rent-btn {
  background-color: var(--primary-color);
  color: var(--dark-bg);
  border: none;
  padding: 10px 20px;
  border-radius: 8px;
  cursor: pointer;
  font-weight: bold;
  transition: background-color 0.3s ease;
}

.rent-btn:hover {
  background-color: #b2e000;
}

/* === Payment Form (payment.html) === */
.payment-container {
  max-width: 600px;
  margin: 80px auto;
  background-color: var(--light-bg);
  border-radius: var(--border-radius);
  padding: 30px 40px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

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

.form-group label {
  display: block;
  margin-bottom: 5px;
  font-weight: bold;
  color: var(--text-muted);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px;
  border-radius: 8px;
  border: 1px solid #444;
  background-color: #333;
  color: var(--text-color);
  font-size: 16px;
  font-family: 'Sarabun', sans-serif;
}

.summary {
  text-align: right;
  font-size: 1.2rem;
  font-weight: bold;
  margin-top: 20px;
}

.confirm-btn {
  width: 100%;
  padding: 15px;
  margin-top: 20px;
  background-color: var(--primary-color);
  color: var(--dark-bg);
  border: none;
  border-radius: 8px;
  font-size: 18px;
  font-weight: bold;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

.confirm-btn:hover {
  background-color: #b2e000;
}

.confirm-btn:disabled {
  background-color: #555;
  cursor: not-allowed;
}


/* === Navbar === */
.navbar {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  height: 60px;
  display: flex;
  background: var(--light-bg);
  border-top: 1px solid #333;
  z-index: 999;
}

.navbar a {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 22px;
}

.navbar a span {
  font-size: 12px;
  margin-top: 2px;
}

.navbar a.active {
  color: var(--primary-color);
}

.success, .error {
   text-align: center;
   font-weight: bold;
  margin-top: 15px;
}
.success { 
  color: green; }

.error { 
  color: red; }

/* === Cart Page Professional Layout === */
.cart-layout {
  display: flex;
  flex-direction: column;
  gap: 30px;
}

@media (min-width: 768px) {
  .cart-layout {
    flex-direction: row;
    align-items: flex-start;
  }
}

.cart-items-list {
  flex: 3; /* ให้ส่วนรายการสินค้ากว้างกว่า */
}

.cart-summary-box {
  flex: 1;
  background-color: var(--light-bg);
  padding: 25px;
  border-radius: var(--border-radius);
  position: sticky;
  top: 20px;
}

.cart-summary-box h3 {
  text-align: left;
  margin-top: 0;
}

.summary-row {
  display: flex;
  justify-content: space-between;
  font-size: 1.1rem;
  margin-bottom: 20px;
}

.summary-row span:last-child {
  font-weight: bold;
  color: var(--primary-color);
}

.cart-item {
  display: flex;
  gap: 15px;
  background-color: var(--light-bg);
  padding: 15px;
  border-radius: var(--border-radius);
  margin-bottom: 15px;
  align-items: center;
}

.cart-item-image {
  width: 80px;
  height: 80px;
  object-fit: cover;
  border-radius: 8px;
}

.cart-item-details {
  flex-grow: 1;
}

.cart-item-details h4 {
  margin: 0 0 5px 0;
  font-size: 1.1rem;
}

.cart-item-details p {
  margin: 2px 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.remove-btn {
  background: none;
  border: none;
  color: #ff5c5c;
  font-size: 1.5rem;
  cursor: pointer;
  padding: 5px;
}

.cart-empty {
  text-align: center;
  padding: 50px;
  background-color: var(--light-bg);
  border-radius: var(--border-radius);
}

.cart-empty p {
  font-size: 1.2rem;
  margin-bottom: 20px;
}

/* === Customer Info Modal (on cart.html) === */
.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(0,0,0,0.6);
  align-items: center;
  justify-content: center;
}

.modal-content {
  background-color: var(--light-bg);
  margin: auto;
  padding: 30px;
  border-radius: var(--border-radius);
  max-width: 500px;
  width: 90%;
  position: relative;
  box-shadow: 0 5px 20px rgba(0,0,0,0.4);
}

.close-btn {
  color: #aaa;
  position: absolute;
  top: 10px;
  right: 20px;
  font-size: 28px;
  font-weight: bold;
  cursor: pointer;
}

/* === Read-only fields and Summary Box (on payment.html) === */
.readonly-input {
  background-color: var(--dark-bg) !important;
  border: 1px solid #444;
  color: var(--text-muted);
  cursor: default;
}

.summary-box {
  background: var(--dark-bg);
  border-radius: 8px;
  padding: 15px 20px;
  margin: 25px 0;
}

.summary-box h3 {
  margin-top: 0;
  text-align: left;
}

.summary-item {
  padding: 5px 0;
  color: var(--text-muted);
}

.summary-total {
  font-size: 1.5rem;
  color: var(--primary-color);
  text-align: right;
  margin-top: 10px;
  border-top: 1px solid #444;
  padding-top: 10px;
}

.confirmation-note {
  text-align: center;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.result-message {
  text-align: center;
  margin-top: 15px;
  font-weight: bold;
  color: #ff5c5c;
}