/* === Root Variables === */
:root {
  /* Colors */
  --White: #ffffff;
  --Slate-100: #efefef;
  --Slate-200: #d8d1d8;
  --Slate-500: #1c232b;
  --Purple: #b555e2;

  /*Typography */
  --font-body: "Montserrat", sans-serif;
  --font-headlines: "Fraunces", serif;

  /* Font Weights */
  --weight-300: 300;
  --weight-500: 500;
  --weight-700: 700;
}

/* === Base  === */
html {
  font-family: var(--font-body);
  font-size: 62.5%; /* 16px * 0.625 = 10px */
}

body {
  font-size: 1.4rem;
  line-height: 1.4;
  background-color: var(--Slate-100);
  color: var(--Slate-500);
}

/* === Typography === */
.logo {
  font-size: clamp(5rem, 4.5vw, 7rem);
  line-height: 0.9;
  font-family: var(--font-headlines);
  color: var(--Slate-500);
  text-transform: uppercase;
  font-weight: var(--weight-700);
}

.logo .book {
  font-style: italic;
  color: var(--Purple);
}

.book-card__likes-count {
  font-family: var(--font-body);
  font-size: clamp(1.4rem, 1vw, 1.6rem);
  font-weight: var(--weight-500);
  color: var(--White);
}

.book-card__genre {
  font-size: 1.4rem;
  text-transform: uppercase;
  letter-spacing: 0.3rem;
}

.book-card__title {
  font-size: clamp(2.4rem, 5vw, 2.6rem);
  line-height: 1.2;
  font-family: var(--font-headlines);
  color: var(--Slate-500);
  font-weight: var(--weight-700);
  height: 5rem;
}

.book-card__comments-title {
  font-size: clamp(1.8rem, 2vw, 2rem);
  line-height: 1.2;
  font-family: var(--font-headlines);
  color: var(--Slate-500);
  font-weight: var(--weight-500);
}

.book-card__comments-comment {
  font-style: italic;
}

@media (max-width: 43.125rem) {
  .book-card__title {
    height: auto;
  }
}

/* === Layout  === */
/* --- Header --- */
header {
  text-align: center;
}

.cta-banner {
  background: var(--Purple);
  padding: 1rem;
  display: flex;
  justify-content: center;
  gap: 4rem;
}

.cta-text {
  font-weight: var(--weight-500);
  display: inline-block;
  text-align: center;
  animation: pulse 5s forwards;
}

@keyframes pulse {
  0% {
    transform: scale(1);
  }
  12.5% {
    transform: scale(1.05);
  }
  25% {
    transform: scale(1);
  }
  37.5% {
    transform: scale(1.05);
  }
  50% {
    transform: scale(1);
  }
  62.5% {
    transform: scale(1.05);
  }
  75% {
    transform: scale(1);
  }
  87.5% {
    transform: scale(1.05);
  }
  100% {
    transform: scale(1);
  }
}

.cta-banner a {
  color: var(--White);
  font-weight: var(--weight-700);
}

.cta-banner a:hover {
  text-decoration: underline;
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4rem 3rem;
  position: relative;
  margin: 0 auto;
}

.nav-left a,
.nav-right a {
  font-size: clamp(1.4rem, 1vw, 1.6rem);
  text-decoration: none;
  margin: 0 2.5rem;
  font-weight: var(--weight-500);
  text-transform: uppercase;
  letter-spacing: 0.5rem;
  transition: text-decoration-color 0.3s ease, text-underline-offset 0.3s ease;
  text-decoration: underline;
  text-decoration-color: transparent;
  text-decoration-thickness: 0.1rem;
  text-underline-offset: 0.3rem;
}

.nav-left a:hover,
.nav-right a:hover {
  color: var(--Purple);
  text-decoration-color: var(--Purple);
  text-underline-offset: 0.5rem;
}

@media (max-width: 66rem) {
  .nav-left a,
  .nav-right {
    display: flex;
    flex-direction: column;
  }
}

@media (max-width: 48rem) {
  .navbar {
    flex-direction: column;
    align-items: center;
    margin-bottom: 3rem;
  }

  .logo {
    order: -1;
  }
  .nav-left {
    order: 1;
  }
  .nav-right {
    order: 1;
  }

  .nav-left,
  .nav-right {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 1rem;
  }

  .cta-banner {
    flex-direction: column;
    gap: 1rem;
    padding: 1.5rem 3rem;
  }
}

/* --- Book Grid --- */
.book-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 30rem), 1fr));
  gap: clamp(1.5rem, 2.5vw, 3rem);
  margin: 0 auto;
  padding: clamp(1rem, 3vw, 3rem);
}

/* --- Footer --- */
footer {
  height: 20rem;
}

/* === 4. Components  === */
/* --- Book Card --- */
.book-card {
  background: var(--White);
  display: flex;
  flex-direction: column;
  border-radius: 1.4rem;
  height: 100%;
  position: relative;
}

.book-card__cover {
  border-radius: 1.4rem 1.4rem 0 0;
}

.book-card__likes {
  position: absolute;
  top: 1.4rem;
  right: 1.4rem;
  display: flex;
  align-items: center;
  flex-direction: row-reverse;
  gap: 0.5rem;
}

.heart-icon .fill-color-shape {
  fill: transparent;
  stroke: var(--White);
  stroke-width: 4;
}
.heart-icon.isLiked .fill-color-shape {
  fill: var(--White);
}

.book-card__info {
  padding: 1.4rem;
}

.book-card__price {
  font-family: var(--font-headlines);
  color: var(--Purple);
  font-size: 2rem;
  font-weight: var(--weight-700);
}

.book-card__comments {
  background-color: var(--Slate-200);
  margin: 0;
  padding: 1.4rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between; /* wichtig */
  flex-grow: 1;
  border-radius: 0 0 1.4rem 1.4rem;
}

.book-card__comments-list {
  max-height: 10rem;
  overflow: auto;
  border-radius: 0.8rem;
  scrollbar-width: thin;
  scrollbar-color: var(--Purple) var(--Slate-200);
}

.book-card__comments-name {
  font-weight: var(--weight-500);
}

.book-card__comment-form {
  display: flex;
  justify-content: space-between;
  margin: 1rem 0 1rem 0;
}

.book-card__comment-input {
  flex-grow: 1;
  padding: 0.8rem;
  border: 1px solid var(--Grey-500);
  border-radius: 0.8rem 0 0 0.8rem;
  font-size: 1.4rem;
  font-style: italic;
}

.book-card__send-btn {
  font-weight: var(--weight-700);
  color: var(--Grey-500);
  opacity: 0.6;
  padding: 0.8rem;
  transition: background-color 0.3s ease;
  cursor: pointer;
}

.book-card__send-btn:hover {
  background-color: var(--white);
  color: var(--Purple);
  animation: pulse 0.4s ease;
  opacity: 1;
}

.book-card__comment-input::placeholder {
  color: var(--Grey-500v);
  opacity: 0.7;
  font-style: italic;
}

@keyframes pulse {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.08);
  }
  100% {
    transform: scale(1);
  }
}

@media (max-width: 17.5rem) {
  .book-card__comment-form {
    flex-direction: column;
    align-items: flex-start;
    gap: 2rem;
  }
}

/* === 5. Utilities === */
.hidden {
  display: none;
}

.mb-2 {
  margin-bottom: 2rem;
}

.mb-1 {
  margin-bottom: 1rem;
}

.max-width {
  max-width: 140rem;
}

.italic {
  font-style: italic;
}