/* global reset + base */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
  font-family: system-ui, sans-serif;
  background: #fafafa;
  padding: 2rem;
  color: #222;
}

/* form section */
.form-container {
  max-width: 700px;
  margin: 0 auto 2rem auto;
  padding: 1.5rem;
  border-radius: 12px;
  background: #fff;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}
form {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}
form input[type="text"],
form input[type="number"] {
  flex: 1 1 calc(33% - 1rem);
  padding: 0.8rem;
  border-radius: 6px;
  border: 1px solid #ccc;
}

/* Chrome, Safari, Edge, Opera */
input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
input[type="number"] {
  appearance: textfield; /* standard */
  -moz-appearance: textfield; /* firefox legacy */
}

form input[type="submit"] {
  padding: 0.8rem 1.2rem;
  background: #444;
  border: none;
  color: #fff;
  border-radius: 6px;
  cursor: pointer;
  flex: 1 1 100%;
  transition: background 0.2s ease;
}
form input[type="submit"]:hover {
  background: #000;
}

/* container grid */
.container {
  display: grid;
  gap: 1.5rem;
  max-width: 1200px;
  margin: 0 auto;
  grid-template-columns: repeat(4, 300px); /* default desktop columns */
}

/* tablet */
@media (max-width: 1024px) {
  .container {
    grid-template-columns: repeat(3, 300px);
  }
}

/* small tablet / large phone */
@media (max-width: 768px) {
  .container {
    grid-template-columns: repeat(2, 300px);
    justify-content: center;
    align-items: center;
  }
}

/* phone */
@media (max-width: 430px) {
  .container {
    grid-template-columns: repeat(1, 300px);
  }
}

@media (max-width: 325px) {
  .container {
    grid-template-columns: repeat(1, 250px);
  }
}

/* book card styling */
.book {
  padding: 1.5rem;
  border-radius: 10px;
  background: #fff;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.06);
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  position: relative;
  overflow: hidden;
  word-wrap: break-word;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.book:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.12);
}
.book p:first-child {
  font-weight: 600;
  font-size: 1.1rem;
}

/* buttons */
.toggle-button,
.remove-button {
  margin-top: 0.5rem;
  padding: 0.5rem 0.7rem;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  font-size: 0.9rem;
  transition: opacity 0.15s ease;
}
.toggle-button {
  background: #eee;
}
.toggle-button:hover {
  opacity: 0.8;
}
.remove-button {
  background: #ff6464;
  color: white;
}
.remove-button:hover {
  opacity: 0.8;
}