/* ═══════════════════════════════════════
   CHATBOX VISITEUR + RETOUR EN HAUT
═══════════════════════════════════════ */

:root {
  --float-action-size: 44px;
  --float-action-gap: var(--space-3);
  --float-action-offset: var(--space-6);
}

.back-to-top {
  position: fixed;
  right: var(--float-action-offset);
  bottom: var(--float-action-offset);
  z-index: 9997;
  width: var(--float-action-size);
  height: var(--float-action-size);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg-card);
  color: var(--color-white-muted);
  cursor: pointer;
  box-shadow: var(--shadow-card);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(8px);
  transition: opacity var(--duration-normal) var(--ease-out),
              visibility var(--duration-normal) var(--ease-out),
              transform var(--duration-normal) var(--ease-out),
              border-color var(--duration-fast),
              color var(--duration-fast);
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0);
}

.back-to-top:hover {
  border-color: var(--color-border-green);
  color: var(--color-green);
}

.chat-widget {
  position: fixed;
  right: var(--float-action-offset);
  bottom: var(--float-action-offset);
  z-index: 9998;
  font-family: var(--font-sans);
  transition: bottom var(--duration-normal) var(--ease-out);
}

body.has-back-to-top .chat-widget {
  bottom: calc(var(--float-action-offset) + var(--float-action-size) + var(--float-action-gap));
}

.chat-toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-full);
  background: var(--color-green);
  color: #080808;
  border: none;
  box-shadow: 0 8px 32px rgba(0, 180, 219, 0.35);
  cursor: pointer;
  font-size: var(--text-sm);
  font-weight: var(--weight-semi);
  transition: transform var(--duration-fast) var(--ease-out),
              box-shadow var(--duration-fast) var(--ease-out),
              background var(--duration-fast);
}

.chat-toggle:hover {
  transform: translateY(-2px);
  background: var(--color-white);
  box-shadow: 0 12px 40px rgba(255, 255, 255, 0.12);
}

.chat-toggle__icon--close {
  display: none;
}

.chat-widget.is-open .chat-toggle__icon--open {
  display: none;
}

.chat-widget.is-open .chat-toggle__icon--close {
  display: block;
}

.chat-panel {
  position: absolute;
  right: 0;
  bottom: calc(100% + var(--space-3));
  width: min(380px, calc(100vw - 2 * var(--space-6)));
  max-height: min(560px, calc(100vh - 8rem));
  overflow: auto;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card), 0 24px 64px rgba(0, 0, 0, 0.45);
  opacity: 0;
  transform: translateY(12px) scale(0.98);
  pointer-events: none;
  transition: opacity var(--duration-normal) var(--ease-out),
              transform var(--duration-normal) var(--ease-out);
}

.chat-widget.is-open .chat-panel {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

.chat-panel__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-5) var(--space-5) var(--space-4);
  border-bottom: 1px solid var(--color-border);
  background: linear-gradient(135deg, var(--color-bg-secondary) 0%, rgba(0, 180, 219, 0.05) 100%);
}

.chat-panel__eyebrow {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-green);
  margin-bottom: var(--space-1);
}

.chat-panel__title {
  font-size: var(--text-lg);
  font-weight: var(--weight-bold);
  color: var(--color-white);
  margin-bottom: var(--space-1);
}

.chat-panel__sub {
  font-size: var(--text-xs);
  color: var(--color-white-muted);
}

.chat-panel__close {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-white-muted);
  cursor: pointer;
  transition: border-color var(--duration-fast), color var(--duration-fast);
}

.chat-panel__close:hover {
  border-color: var(--color-border-green);
  color: var(--color-white);
}

.chat-form {
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.chat-form .form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.chat-form .form-label {
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-white-muted);
}

.chat-form .form-input,
.chat-form .form-textarea {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  color: var(--color-white);
  padding: var(--space-3) var(--space-4);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  border-radius: var(--radius-sm);
  transition: border-color var(--duration-fast), background var(--duration-fast);
  outline: none;
  width: 100%;
}

.chat-form .form-input::placeholder,
.chat-form .form-textarea::placeholder {
  color: var(--color-white-muted);
}

.chat-form .form-input:focus,
.chat-form .form-textarea:focus {
  border-color: var(--color-green);
  background: var(--color-bg-card);
}

.chat-form .btn-outline {
  border: 1px solid var(--color-border);
  color: var(--color-white-dim);
}

.chat-form .btn-outline:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.3);
  color: var(--color-white);
}

.chat-form__textarea {
  min-height: 96px;
}

.chat-form__error {
  margin: 0;
  padding: var(--space-3);
  font-size: var(--text-xs);
  color: #ff5733;
  background: rgba(255, 87, 51, 0.1);
  border: 1px solid rgba(255, 87, 51, 0.25);
  border-radius: var(--radius-sm);
}

.chat-form__submit {
  width: 100%;
  justify-content: center;
}

.chat-form__submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.chat-form__note {
  margin: 0;
  font-size: var(--text-xs);
  color: var(--color-white-muted);
  text-align: center;
  line-height: 1.5;
}

.chat-form__note a {
  color: var(--color-green);
  text-decoration: none;
}

.chat-form__note a:hover {
  text-decoration: underline;
}

.chat-success {
  padding: var(--space-8) var(--space-5);
  text-align: center;
}

.chat-success__icon {
  width: 56px;
  height: 56px;
  margin: 0 auto var(--space-4);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-green-subtle);
  border: 1px solid var(--color-border-green);
  color: var(--color-green);
}

.chat-success__title {
  font-size: var(--text-lg);
  font-weight: var(--weight-bold);
  color: var(--color-white);
  margin-bottom: var(--space-2);
}

.chat-success__text {
  font-size: var(--text-sm);
  color: var(--color-white-muted);
  line-height: 1.6;
  margin-bottom: var(--space-5);
}

.chat-success__btn {
  width: 100%;
  justify-content: center;
}

@media (max-width: 640px) {
  :root {
    --float-action-offset: var(--space-4);
  }

  .chat-widget {
    right: var(--float-action-offset);
  }

  .back-to-top {
    right: var(--float-action-offset);
  }

  .chat-panel {
    width: calc(100vw - 2 * var(--space-4));
    max-height: calc(100vh - 6rem);
  }

  .chat-toggle__label {
    display: none;
  }

  .chat-toggle {
    width: 52px;
    height: 52px;
    padding: 0;
    justify-content: center;
    border-radius: 50%;
  }
}