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

html, body {
    width: 100%;
    height: 100%;
    justify-content: center;
    align-items: center;
    margin: 0;
}

body {
    background-color: rgb(222, 217, 217);
}

.grid-container {
    display: grid;
    grid-template-columns: 10% 1fr 10% 1fr;
    gap: 2rem;
    align-items: start;
    width: 100%;
    height: 100%;
}

.header {
    grid-column: 1 / 2;
    grid-row: 1 / span 2;
    font-size: 50px;
    color: rgb(23, 4, 76);
    transform: rotate(-90deg);
    transform-origin: left top;
    align-self: center;
    font-weight: lighter;
    margin: 20px;
}

.main-list {
    grid-column: 2 / 3;
}


.main-list, .book-list {
    list-style: none;
}

h2 {
    font-family: Arial, Helvetica, sans-serif;
    font-size: 25px;
    color: rgb(28, 139, 28);
    margin: 10PX;
}

.first-book {
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid #222;
    padding: 10px 0;
    font-size: small;
}

.first-img {
    width: 100px;
    margin-right: 20px;
}

.first-details {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.book-title {
    color: navy;
    font-weight: bold;
    font-size: 1rem;
    margin: 0;
}

.author-name {
    font-style: italic;
    font-size: .9rem;
    color: #444;
    margin: 0;
}

.book-price {
    font-weight: bold;
    color: rgb(0, 19, 128);
    font-size: .95rem;
    margin: 0;
}


.stock {
    padding: 2px 8px;
    border-radius: 20px;
    font-size: 0.8rem;
    width: fit-content;
}

.stock.in {
    background-color: #218a21;
}

.stock.out {
    background-color: #ffe6e6;
}


.delete-wrap {
  display: flex;
  align-items: flex-start;
  padding-left: 10px;
}

.delete-btn {
  background: none;
  border: none;
  font-size: 1rem;
  cursor: pointer;
  color: #4a4848;
  margin-left: 30px;
  align-self: flex-start;
  transition: color 0.3s ease;
}

.delete-btn:hover {
  background-color: red;
}


.vertical-bar {
    display: flex;   
    background-color: navy;
    width: 1px;
    height: 50%;
    margin: 20px;
    margin-left: 100px;
    margin-top: 250px;
}

.container {
    display: flex;
  justify-content: center; /* Horizontal center */
  align-items: center;     /* Vertical center */
  width: 90%;
  height: 90vh;
    grid-column:  4 / 5;
    margin: 20px;
}

input {
    width: 90%;
  padding: 10px;
  font-size: 16px;
  border: none;
  border-bottom: 2px solid navy;
  background-color: transparent;
  color: navy;
  margin: 15px 0;
  box-sizing: border-box;
}

.select-stock {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 90%;
  margin: 15px 0;
  border-bottom: 2px solid navy;
  padding-bottom: 5px;
  box-sizing: border-box;
}

.select-stock label {
  font-size: 1rem;
  color: #000;
  white-space: nowrap;
}

.select-stock select {
  flex: 1;
  margin-left: 10px;
  border: none;
  background: transparent;
  font-size: 1rem;
  color: navy;
  padding: 4px 0;
}

.select-stock select:focus {
  outline: none;
}


select {
    height: 42px;
    line-height: 1.5;
}

label[for="instock"] {
    margin: 0;
    font-size: 1rem;
    gap: 5px;
    color: #000;
    margin: 0;
    white-space: nowrap;
}

button {
    width: 90%;
    height: 40px;
    margin-top: 20px;
    background-color: rgb(12, 12, 94);
    color: white;
    border-radius: 20px;
    font-size: normal;
}


@media (max-width: 768px) {
  .grid-container {
    display: flex;
    flex-direction: column;   /* Stack vertically */
    align-items: center;      /* Horizontally center everything */
    margin: 10px;                /* Optional spacing between items */
    width: 100%;
    padding: 0;
    box-sizing: border-box;
  }

  .header {
    transform: none;
    text-align: center;       /* Optional: center text inside header */
  }

  h2 {
    text-align: center;
  }

  .main-list,
  .container {
    width: 100%;              /* Make them responsive */
    max-width: 500px;         /* Optional max width */
  }

  .main-list {
    margin-bottom: 0;
  }

  .container {
    margin: 0;
    margin-top: 0;
    margin-bottom: 20px;
  }

  button {
    margin-bottom: 30px;
  }
}