:root {
  --gold: #b89a5e;
  --page-bg: #f5f2ee;
  --surface: #ffffff;
  --border: rgba(184, 154, 94, 0.28);
  --border-hover: rgba(184, 154, 94, 0.6);
  --input-bg: rgba(255, 255, 255, 0.8);
  --input-focus-bg: rgba(184, 154, 94, 0.06);
  --text-primary: #1a1a1a;
  --text-secondary: rgba(26, 26, 26, 0.55);
  --text-label: rgba(26, 26, 26, 0.5);
  --text-muted: rgba(26, 26, 26, 0.38);
  --placeholder: rgba(26, 26, 26, 0.35);
  --select-option-bg: #ffffff;
  --separator-color: rgba(184, 154, 94, 0.6);

  --fs-hero: clamp(2.8rem, 6vw, 5.5rem);
  --fs-label: 0.68rem;
  --fs-body: clamp(0.88rem, 1.4vw, 1rem);
  --radius: 4px;
  --transition: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

/* dark mode*/
body.dark-theme {
  --page-bg: #111010;
  --surface: #181614;
  --border: rgba(184, 154, 94, 0.18);
  --border-hover: rgba(184, 154, 94, 0.45);
  --input-bg: rgba(255, 255, 255, 0.03);
  --input-focus-bg: rgba(184, 154, 94, 0.05);
  --text-primary: #e8e2d9;
  --text-secondary: rgba(232, 226, 217, 0.45);
  --text-label: rgba(232, 226, 217, 0.6);
  --text-muted: rgba(232, 226, 217, 0.3);
  --placeholder: rgba(232, 226, 217, 0.2);
  --select-option-bg: #1f1d1a;
  --separator-color: rgba(184, 154, 94, 0.4);
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--page-bg);
  color: var(--text-primary);
  font-family: "Raleway", sans-serif;
  font-weight: 400;
  line-height: 1.7;
  transition:
    background-color 0.3s,
    color 0.3s;
}

.container {
  width: min(1060px, 92%);
  margin-inline: auto;
}
.u-label {
  font-family: "Raleway", sans-serif;
  font-size: var(--fs-label);
  font-weight: 600;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--gold);
}

/* section d hero */
.book-hero {
  position: relative;
  padding-block: clamp(8rem, 12vw, 11rem) clamp(3.5rem, 7vw, 6rem);
  overflow: hidden;
  z-index: 1;
  background-color: #0a0a0a; 
}

.book-hero-bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image: url("img/book-pattern.jpg");
  background-size: cover;
  background-position: center;
  opacity: 0.3; /
}

.book-hero::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 100px;
  background: linear-gradient(to top, var(--page-bg) 0%, transparent 100%);
  z-index: 0;
  pointer-events: none;
}

.book-hero__inner {
  position: relative;
  z-index: 1;
  max-width: 680px;
}
.book-hero__eyebrow {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  margin-bottom: 1.4rem;
  opacity: 0;
  animation: fadeUp 0.7s 0.1s ease forwards;
}
.book-hero__eyebrow::before {
  content: "";
  display: block;
  width: 28px;
  height: 1px;
  background: var(--gold);
  flex-shrink: 0;
}
.book-hero__title {
  font-family: "Cormorant Garamond", serif;
  font-size: var(--fs-hero);
  font-weight: 300;
  line-height: 1.05;
  color: #ffffff;
  opacity: 0;
  animation: fadeUp 0.7s 0.22s ease forwards;
  text-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
}
.book-hero__title em {
  font-style: italic;
  color: var(--gold);
  display: block;
  text-shadow: none;
}
.book-hero__desc {
  margin-top: 1.4rem;
  font-size: var(--fs-body);
  color: rgba(255, 255, 255, 0.8);
  max-width: 46ch;
  line-height: 1.75;
  opacity: 0;
  animation: fadeUp 0.7s 0.34s ease forwards;
}

/* section du form*/
.book-form-section {
  position: relative;
  z-index: 1;
  padding-block: clamp(2rem, 5vw, 4.5rem);
}
.book-form-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: clamp(3rem, 6vw, 6rem);
  align-items: start;
}

.form-header {
  margin-bottom: 2.5rem;
}
.form-header h2 {
  font-family: "Cormorant Garamond", serif;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 300;
  color: var(--text-primary);
  margin-top: 0.5rem;
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 1.5rem;
}

.field {
  position: relative;
  padding-bottom: 2rem;
  opacity: 0;
  transform: translateY(14px);
  transition:
    opacity 0.55s ease,
    transform 0.55s ease;
}
.field.visible {
  opacity: 1;
  transform: none;
}
.field__label {
  display: block;
  font-size: var(--fs-label);
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-label);
  margin-bottom: 0.55rem;
  transition: color var(--transition);
}
.field:focus-within .field__label {
  color: var(--gold);
}

.field__input,
.field__textarea,
.field__select {
  width: 100%;
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-family: "Raleway", sans-serif;
  font-size: var(--fs-body);
  font-weight: 600;
  padding: 0.85rem 1rem;
  outline: none;
  transition: 0.3s;
  -webkit-appearance: none;
}
.field__input::placeholder,
.field__textarea::placeholder {
  color: var(--placeholder);
  font-weight: 400;
}
.field__input:hover,
.field__textarea:hover,
.field__select:hover {
  border-color: var(--border-hover);
}
.field__input:focus,
.field__textarea:focus,
.field__select:focus {
  border-color: var(--gold);
  background: var(--input-focus-bg);
  box-shadow: 0 0 0 3px rgba(184, 154, 94, 0.08);
}
.field__textarea {
  resize: vertical;
  min-height: 148px;
  line-height: 1.65;
}
.field--select::after {
  content: "";
  position: absolute;
  right: 1rem;
  bottom: calc(2rem + 1.05rem);
  width: 7px;
  height: 7px;
  border-right: 1px solid var(--gold);
  border-bottom: 1px solid var(--gold);
  transform: rotate(45deg);
  pointer-events: none;
}
.field__select option {
  background: var(--select-option-bg);
  color: var(--text-primary);
}

.field__error {
  position: absolute;
  bottom: 0.55rem;
  left: 0;
  font-size: 0.65rem;
  color: var(--red);
  opacity: 0;
}
.field.has-error .field__input {
  border-color: var(--red);
}
.field.has-error .field__error {
  opacity: 1;
}

.form-separator {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-block: 0.5rem 2rem;
}
.form-separator span {
  font-size: var(--fs-label);
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--separator-color);
}
.form-separator::before,
.form-separator::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* button submit */
.form-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-top: 0.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
  opacity: 0;
  transform: translateY(14px);
  transition: 0.55s;
}
.form-footer.visible {
  opacity: 1;
  transform: none;
}
.form-footer__note {
  font-size: 0.75rem;
  color: var(--text-muted);
  max-width: 28ch;
}

/* light mode */
.btn-submit {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  background: var(--text-primary);
  color: var(--page-bg);
  font-family: "Raleway", sans-serif;
  font-size: var(--fs-label);
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  padding: 1rem 2.2rem;
  cursor: pointer;
  border-radius: var(--radius);
  border: 1px solid var(--text-primary);
  transition: 0.3s;
  overflow: hidden;
}
.btn-submit::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: left;
  transition: 0.3s;
  z-index: 0;
}
.btn-submit:hover::before {
  transform: scaleX(1);
}
.btn-submit:hover {
  border-color: var(--gold);
  color: #1a1a1a;
}
.btn-submit span,
.btn-submit svg {
  position: relative;
  z-index: 1;
}
.btn-submit svg {
  width: 14px;
  height: 14px;
  stroke: currentColor;
  fill: none;
  transition: transform 0.3s;
}
.btn-submit:hover svg {
  transform: translateX(4px);
}

body.dark-theme .btn-submit {
  background: transparent;
  border-color: var(--gold);
  color: var(--gold);
}
body.dark-theme .btn-submit:hover {
  color: #1a1a1a;
}

/* Box */
.form-success {
  display: none;
  flex-direction: column;
  align-items: flex-start;
  gap: 1rem;
  padding: 2.5rem;
  background: rgba(0, 98, 51, 0.07);
  border: 1px solid rgba(0, 98, 51, 0.25);
  border-radius: var(--radius);
}
.form-success.visible {
  display: flex;
}
.form-success__icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(0, 98, 51, 0.15);
  display: grid;
  place-items: center;
  color: var(--green);
  font-size: 1.1rem;
}
.form-success h3 {
  font-family: "Cormorant Garamond", serif;
  font-size: 1.5rem;
  font-weight: 300;
}

/* sidebar */
.book-sidebar {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
  position: sticky;
  top: 100px;
}
.sidebar-promise {
  border-left: 1px solid var(--border);
  padding-left: 1.5rem;
}
.sidebar-promise h3 {
  font-family: "Cormorant Garamond", serif;
  font-size: 1.35rem;
  color: var(--text-primary);
  margin-bottom: 0.6rem;
}
.sidebar-promise p {
  font-size: 0.82rem;
  color: var(--text-secondary);
}
.sidebar-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.sidebar-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.82rem;
  color: var(--text-secondary);
}
.sidebar-list li::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--gold);
  flex-shrink: 0;
  margin-top: 0.55em;
}
.sidebar-contact span {
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-muted);
  font-weight: 700;
}
.sidebar-contact a {
  color: var(--gold);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 600;
  display: block;
  margin-top: 5px;
}

@media (max-width: 860px) {
  .book-form-layout {
    grid-template-columns: 1fr;
  }
  .book-sidebar {
    position: static;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 1.5rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border);
  }
  .sidebar-promise,
  .sidebar-contact {
    flex: 1 1 200px;
  }
  .sidebar-list {
    display: none;
  }
}
@media (max-width: 580px) {
  .form-row {
    grid-template-columns: 1fr;
  }
}
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}