/* === Fonts === */
@import url("https://fonts.googleapis.com/css2?family=Poppins:wght@400;500;600&display=swap");

/* === Color Vars === */
:root {
  --white: #fffbfb;
  --grey: #f0eef1;
  --black: #050505;
  --red: #ff7070;
  --light-green: #9fff9c;
  --light-red: #ff9c9c;
}

/* === Global === */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background-color: var(--grey);
  color: var(--black);
  font-family: "Poppins", system-ui, -apple-system, "Segoe UI", Roboto, Arial,
    sans-serif;
  font-size: 18px;
  font-weight: 500;
  word-wrap: break-word;
  margin-bottom: 100px;
  line-height: 1.4;
}

button,
input {
  border: none;
  color: inherit;
  font-family: inherit;
  font-size: inherit;
  font-weight: inherit;
  cursor: pointer;
  outline: none;
}

button:focus-visible,
input:focus-visible {
  outline: 2px dashed var(--black);
  outline-offset: 2px;
}

input[type="text"],
input[type="number"] {
  cursor: text;
}

/* === Header === */
header {
  padding: 16px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: var(--white);
  box-shadow: rgba(0, 0, 0, 0.16) 0px 1px 4px;
}

#new-book {
  padding: 12px 16px;
  border-radius: 8px;
  background-color: var(--black);
  color: var(--white);
  transition: filter 0.15s ease-in-out, transform 0.06s ease-in-out;
}

#new-book:hover {
  filter: brightness(92%);
}
#new-book:active {
  transform: translateY(1px);
}

/* === Main === */
main {
  flex: 1;
  margin: 24px 0;
  text-align: center;
  padding: 0 24px;
}

/* === Books Container === */
.books-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 32px;
  margin-top: 32px;
}

/* === Book Card === */
.book-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 16px;
  padding: 16px;
  border-radius: 8px;
  background-color: var(--white);
  box-shadow: rgba(0, 0, 0, 0.16) 0px 1px 4px;
  line-height: 1.25;
  text-align: center;
}

/* Button group inside card */
.button-group {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* === Buttons (generic) === */
.btn {
  padding: 12px 16px;
  border-radius: 8px;
  transition: filter 0.15s ease-in-out, transform 0.06s ease-in-out;
}

.btn:hover {
  filter: brightness(92%);
}
.btn:active {
  transform: translateY(1px);
}

.btn-light-green {
  background-color: var(--light-green);
}
.btn-light-red {
  background-color: var(--light-red);
}

/* === Footer === */
footer {
  padding: 16px 24px;
  text-align: center;
}

footer a {
  position: relative;
  display: inline-block;
  text-decoration: none;
  color: #111;
  font-weight: 500;
}

footer a::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: #0077ff;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}

footer a:hover::after {
  transform: scaleX(1);
}

/* === New Book Modal === */
.new-book-info {
  display: none;
  position: fixed;
  top: 50%;
  left: 50%;
  z-index: 1001;
  width: 320px;
  padding: 16px;
  border-radius: 8px;
  background-color: var(--grey);
  text-align: center;
  transform: translate(-50%, -50%) scale(0.9);
  opacity: 0;
  transition: 0.2s ease-in-out;
  box-shadow: rgba(0, 0, 0, 0.16) 0px 4px 16px;
}

.new-book-info.active {
  display: block;
  transform: translate(-50%, -50%) scale(1);
  opacity: 1;
}

.new-book-form {
  display: grid;
  gap: 12px;
}

.new-book-form input,
.new-book-form button {
  width: 100%;
  padding: 12px;
  border-radius: 8px;
}

.new-book-form input {
  background-color: var(--white);
  box-shadow: rgba(0, 0, 0, 0.08) 0 1px 2px inset;
}

.new-book-form .status {
  max-width: fit-content;
  margin-left: 12px;
}

.new-book-form button {
  background-color: var(--light-green);
}

/* === Overlay === */
.overlay {
  position: fixed;
  inset: 0;
  display: none;
  z-index: 1000;
  background-color: rgba(0, 0, 0, 0.5);
  transition: opacity 0.2s ease-in-out;
  opacity: 0;
}

.overlay.active {
  display: block;
  opacity: 1;
}

/* === Mobile (<= 600px) === */
@media (max-width: 600px) {
  body {
    font-size: 16px;
  }

  header {
    padding: 12px 16px;
  }
  #new-book {
    padding: 10px 14px;
    border-radius: 8px;
  }

  main {
    margin: 16px 0;
    padding: 0 16px;
  }

  .books-container {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 24px;
    margin-top: 24px;
  }

  .book-card {
    gap: 12px;
    padding: 14px;
  }

  .button-group {
    gap: 12px;
  }

  .btn {
    padding: 10px 14px;
  }

  footer {
    padding: 12px 16px;
  }

  .new-book-info {
    width: 90%;
    max-width: 360px;
    padding: 14px;
  }
}