:root {
  --bg: #f8fafc;
  --surface: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --primary: #2563eb;
  --primary-contrast: #ffffff;
  --border: #e5e7eb;
  --shadow: 0 8px 24px rgba(15, 23, 42, 0.06);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
}

/* HEADER */

.site-header,
.site-footer {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 16px 24px;
}

.site-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
}

.brand {
  font-size: 1.4rem;
  font-weight: 700;
}

.main-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* BUTTONS */

.nav-button,
.primary-button,
.secondary-button {
  border: none;
  border-radius: 12px;
  padding: 10px 16px;
  cursor: pointer;
  font-weight: 600;
  transition: 0.2s ease;
}

.nav-button {
  background: transparent;
  color: var(--text);
}

.nav-button.active,
.primary-button {
  background: var(--primary);
  color: var(--primary-contrast);
}

.secondary-button {
  background: #f3f4f6;
  color: var(--text);
}

.primary-button:hover,
.secondary-button:hover,
.nav-button:hover {
  transform: translateY(-2px);
}

/* PAGE */

.page-shell {
  max-width: 1200px;
  margin: 24px auto;
  padding: 0 24px 48px;
}

.page-section {
  display: none;
}

.page-section.visible {
  display: block;
}

.section-header {
  margin-bottom: 24px;
}

.section-header h1 {
  margin: 0;
  font-size: 2rem;
}

.section-header p {
  color: var(--muted);
  margin-top: 8px;
}

/* CARDS */

.cards-grid {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  margin-top: 20px;
}

.item-card,
.favorite-item,
.list-row,
.account-box,
.chat-shell,
.article-form-section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 20px;
  box-shadow: var(--shadow);
}

.item-card {
  display: grid;
  gap: 14px;
}

.item-image {
  height: 150px;
  background: #e5e7eb;
  border-radius: 14px;
  display: grid;
  place-items: center;
  color: var(--muted);
  font-weight: 600;
}

.item-details p {
  margin: 6px 0;
  color: var(--muted);
}

.item-actions {
  display: flex;
  justify-content: space-between;
  gap: 10px;
}

/* FORMULAIRE ARTICLE */

.article-form-section {
  margin-top: 24px;
  margin-bottom: 24px;
}

.article-form-section h2 {
  margin-top: 0;
  margin-bottom: 20px;
}

#article-form {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

#article-form input,
#article-form textarea,
#article-form select,
.account-box input {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px 16px;
  font-size: 0.95rem;
  background: #fff;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

#article-form textarea {
  min-height: 140px;
  resize: vertical;
}

#article-form input:focus,
#article-form textarea:focus,
#article-form select:focus,
.account-box input:focus,
.chat-input-row input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.12);
}

/* FILE INPUT */

#article-image {
  background: #f9fafb;
  padding: 12px;
  cursor: pointer;
}

/* LIST PANEL */

.list-panel {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}

.list-row {
  display: grid;
  grid-template-columns: 2fr 1fr 2fr;
  align-items: center;
  gap: 12px;
}

.list-row strong {
  color: var(--text);
}

/* FAVORITES */

.favorites-panel,
.account-grid {
  display: grid;
  gap: 16px;
  margin-top: 18px;
}

.favorite-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

/* CHAT */

.chat-shell {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 18px;
  min-height: 420px;
  margin-top: 18px;
}

.chat-list {
  display: grid;
  gap: 10px;
}

.chat-thread {
  width: 100%;
  text-align: left;
  border: 1px solid var(--border);
  background: transparent;
  padding: 14px;
  border-radius: 12px;
  cursor: pointer;
  transition: 0.2s ease;
}

.chat-thread.active {
  background: var(--primary);
  color: var(--primary-contrast);
  border-color: transparent;
}

.chat-window {
  display: grid;
  gap: 14px;
}

.chat-header {
  font-weight: 700;
}

.chat-messages {
  background: #f9fafb;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px;
  min-height: 260px;
  display: grid;
  gap: 10px;
  overflow-y: auto;
}

.message {
  max-width: 75%;
  padding: 12px 14px;
  border-radius: 18px;
}

.message.seller {
  background: #e0f2fe;
  justify-self: start;
}

.message.user {
  background: #d1fae5;
  justify-self: end;
}

.chat-input-row {
  display: flex;
  gap: 10px;
}

.chat-input-row input {
  flex: 1;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 14px;
}

/* ACCOUNT */

.account-grid {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

/* FOOTER */

.site-footer {
  text-align: center;
  color: var(--muted);
}

/* RESPONSIVE */

@media (max-width: 840px) {

  .chat-shell {
    grid-template-columns: 1fr;
  }

  .list-row {
    grid-template-columns: 1fr;
  }

  .favorite-item {
    flex-direction: column;
    align-items: flex-start;
  }

  .site-header {
    flex-direction: column;
    align-items: stretch;
  }

  .main-nav {
    justify-content: center;
  }

  .primary-button,
  .secondary-button,
  .nav-button {
    width: 100%;
  }

  .form-row {
    grid-template-columns: 1fr;
  }
}

.load-more-container {
  display: flex;
  justify-content: center;
  margin-top: 40px;
  margin-bottom: 30px;
}

#load-more-btn {
  min-width: 180px;
}

.product-page {
  display: flex;
  gap: 40px;
  background: white;
  padding: 30px;
  border-radius: 20px;
  margin-top: 30px;
}

.product-page-image {
  width: 450px;
  height: 450px;
  object-fit: cover;
  border-radius: 20px;
}

.product-page-content {
  flex: 1;
}

.product-page-content h1 {
  margin-bottom: 20px;
}

.product-page-meta {
  display: flex;
  gap: 20px;
  margin-bottom: 25px;
  font-weight: bold;
}

.product-description {
  line-height: 1.7;
  margin-bottom: 30px;
}

.product-page-footer {
  font-weight: bold;
}

.product-description {
  line-height: 1.7;
  margin-bottom: 30px;

  word-break: break-word;
  overflow-wrap: break-word;
  white-space: pre-wrap;
}

.product-page-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;

  margin-top: 30px;
}