/* CSS Variables (Design Tokens) */
:root {
  --bg-primary: #FFF8F0;
  --bg-secondary: #FFFFFF;
  --color-primary: #FF8A65;
  --color-primary-hover: #FF7043;
  --color-secondary: #81C784;
  --color-secondary-hover: #66BB6A;
  --color-text: #5D4037;
  --color-text-light: #8D6E63;
  --color-error: #E57373;
  --color-error-bg: #FFEBEE;
  --color-success: #81C784;
  --color-border: #E0E0E0;
  --radius: 16px;
  --radius-sm: 8px;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.15);
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --transition: 0.2s ease;
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  padding-bottom: 80px;
}

body.lightbox-open {
  overflow: hidden;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 16px;
}

.container--centered {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: calc(100vh - 200px);
}

/* Header */
.header {
  background-color: var(--bg-secondary);
  box-shadow: var(--shadow);
  padding: 16px 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
  transition: var(--transition);
  display: flex;
  align-items: center;
}

.logo:hover {
  color: var(--color-primary-hover);
}

.logo-icon {
  width: 24px;
  height: 24px;
  vertical-align: middle;
  margin-right: 8px;
}

.nav {
  display: flex;
  gap: 16px;
}

.nav-link {
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.nav-link:hover {
  background-color: var(--bg-primary);
  color: var(--color-primary);
}

/* Page Title */
.page-title {
  font-size: 2rem;
  margin: 24px 0;
  text-align: center;
}

/* Items Grid */
.items-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
  padding: 24px 0;
}

/* Item Card */
.item-card {
  background: var(--bg-secondary);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: var(--transition);
  height: 100%;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: start;
}

.item-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.item-card-link {
  text-decoration: none;
  color: inherit;
  display: block;
}

.item-image {
  width: 100%;
  aspect-ratio: 1;
  overflow: hidden;
  background-color: #f5f5f5;
}

.item-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.item-image--placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-light);
}

.item-content {
  padding: 16px;
  display: flex;
  flex-direction: column;
  justify-content: stretch;
  flex: 1;
}

.item-title {
  font-size: 1.25rem;
  margin-bottom: 8px;
  color: var(--color-text);
}

.item-description {
  color: var(--color-text-light);
  font-size: 0.9rem;
  margin-bottom: 12px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
}

.item-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 12px;
  border-top: 1px solid var(--color-border);
}

.item-price {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
}

.item-price--negotiable {
  color: var(--color-secondary);
  font-weight: 500;
  font-size: 1rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: var(--transition);
}

.btn--primary {
  background-color: var(--color-primary);
  color: white;
}

.btn--primary:hover {
  background-color: var(--color-primary-hover);
}

.btn--secondary {
  background-color: var(--bg-primary);
  color: var(--color-text);
  border: 2px solid var(--color-border);
}

.btn--secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn--telegram {
  background-color: #0088CC;
  color: white;
}

.btn--telegram:hover {
  background-color: #0077AA;
}

.btn--danger {
  background-color: var(--color-error);
  color: white;
}

.btn--danger:hover {
  background-color: #d32f2f;
}

.btn--full {
  width: 100%;
}

.btn--telegram-fixed {
  width: calc(100% - 32px);
  padding: 16px;
  font-size: 1.1rem;
  background-color: #0088CC;
}

.btn--telegram-fixed:hover {
  background-color: #0077AA;
}

/* Fixed Telegram Bar (Mobile) */
.fixed-telegram-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--bg-secondary);
  padding: 16px;
  box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.1);
  display: none;
  z-index: 1000;
}

@media (max-width: 768px) {
  .fixed-telegram-bar {
    display: block;
  }

  body {
    padding-bottom: 100px;
  }

}

/* Detail Page */
.item-detail-page {
  padding: 24px 0;
}

.back-link {
  display: inline-block;
  margin-bottom: 24px;
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
}

.back-link:hover {
  color: var(--color-primary);
}

.detail-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 24px;
}

.detail-title {
  font-size: 2rem;
  color: var(--color-text);
}

.detail-price {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-primary);
}

.detail-price--negotiable {
  color: var(--color-secondary);
  font-size: 1.25rem;
}

/* Gallery */
.gallery {
  margin-bottom: 32px;
}

.gallery-main {
  width: 100%;
  max-height: 500px;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--bg-secondary);
  margin-bottom: 16px;
  cursor: zoom-in;
}

.gallery-main img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.gallery-thumbnails {
  display: flex;
  gap: 12px;
  overflow-x: auto;
  padding: 4px;
}

.gallery-thumbnail {
  flex-shrink: 0;
  width: 80px;
  height: 80px;
  padding: 0;
  border: 3px solid transparent;
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  cursor: pointer;
  overflow: hidden;
  transition: var(--transition);
}

.gallery-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.gallery-thumbnail:hover,
.gallery-thumbnail--active {
  border-color: var(--color-primary);
}

/* Detail Placeholder */
.detail-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 300px;
  background: var(--bg-secondary);
  border-radius: var(--radius);
  color: var(--color-text-light);
  margin-bottom: 32px;
}

.detail-placeholder svg {
  margin-bottom: 16px;
}

/* Detail Description */
.detail-description {
  background: var(--bg-secondary);
  padding: 24px;
  border-radius: var(--radius);
  margin-bottom: 32px;
}

.detail-description h2 {
  font-size: 1.25rem;
  margin-bottom: 16px;
  color: var(--color-text);
}

.detail-description p {
  white-space: pre-wrap;
  line-height: 1.8;
}

/* Detail Actions */
.detail-actions {
  display: flex;
  gap: 16px;
}

@media (max-width: 600px) {
  .detail-actions .btn {
    flex: 1;
  }
}

/* Lightbox */
.lightbox {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.85);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 200ms ease, visibility 200ms ease;
}

.lightbox.lightbox-open {
  opacity: 1;
  visibility: visible;
}

.lightbox-content {
  max-width: 90vw;
  max-height: 90vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.lightbox-image {
  max-width: 90vw;
  max-height: 90vh;
  object-fit: contain;
  border-radius: var(--radius-sm);
}

.lightbox-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 48px;
  height: 48px;
  background: rgba(255, 255, 255, 0.1);
  border: none;
  border-radius: 50%;
  color: white;
  font-size: 2rem;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.lightbox-close:hover {
  background: rgba(255, 255, 255, 0.2);
}

.lightbox-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  background: rgba(255, 255, 255, 0.1);
  border: none;
  border-radius: 50%;
  color: white;
  font-size: 2rem;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.lightbox-nav:hover {
  background: rgba(255, 255, 255, 0.2);
}

.lightbox-nav--prev {
  left: 16px;
}

.lightbox-nav--next {
  right: 16px;
}

.lightbox-nav:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

/* Login Card */
.login-card,
.form-card {
  background: var(--bg-secondary);
  padding: 32px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 400px;
}

.login-title,
.form-title {
  text-align: center;
  margin-bottom: 24px;
  color: var(--color-text);
}

/* Admin List */
.admin-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 24px;
}

.admin-item {
  background: var(--bg-secondary);
  padding: 16px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  gap: 16px;
}

.admin-item__image {
  width: 80px;
  height: 80px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background-color: #f5f5f5;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  flex-shrink: 0;
}

.admin-item__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.admin-item__info {
  flex: 1;
  min-width: 0;
}

.admin-item__info h3 {
  font-size: 1.1rem;
  margin-bottom: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.admin-item__info p {
  color: var(--color-primary);
  font-weight: 600;
}

.admin-item__info small {
  color: var(--color-text-light);
}

.admin-item__actions {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
}

.inline-form {
  display: inline;
}

/* Forms */
.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
}

.form-group input[type="text"],
.form-group input[type="number"],
.form-group input[type="password"],
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-family: inherit;
  transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
}

textarea {
  resize: vertical;
  min-height: 100px;
}

.help-text {
  display: block;
  margin-top: 4px;
  font-size: 0.85rem;
  color: var(--color-text-light);
}

/* Photo Grid */
.photo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  gap: 12px;
}

.photo-item {
  position: relative;
}

.photo-item img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

.photo-delete {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-top: 4px;
  font-size: 0.8rem;
  color: var(--color-error);
  cursor: pointer;
}

.photo-delete input {
  cursor: pointer;
}

/* File Input */
.file-input {
  padding: 12px;
  background: var(--bg-primary);
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-sm);
  width: 100%;
}

/* Form Actions */
.form-actions {
  display: flex;
  gap: 12px;
  justify-content: flex-end;
  margin-top: 24px;
}

/* Admin Actions */
.admin-actions {
  display: flex;
  justify-content: center;
  margin-bottom: 24px;
}

/* Alerts */
.alert {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
}

.alert--error {
  background-color: var(--color-error-bg);
  color: var(--color-error);
  border: 1px solid var(--color-error);
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 48px 24px;
  color: var(--color-text-light);
  font-size: 1.25rem;
}

/* Error Card */
.error-card {
  background: var(--bg-secondary);
  padding: 48px 32px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  text-align: center;
  max-width: 400px;
}

.error-title {
  font-size: 2rem;
  margin-bottom: 16px;
}

.error-message {
  color: var(--color-text-light);
  margin-bottom: 24px;
}

/* Footer */
.footer {
  text-align: center;
  padding: 24px;
  color: var(--color-text-light);
}

/* Responsive */
@media (max-width: 600px) {
  .header-content {
    flex-direction: column;
    gap: 12px;
  }

  .page-title {
    font-size: 1.5rem;
  }

  .items-grid {
    grid-template-columns: 1fr;
  }

  .admin-item {
    flex-wrap: wrap;
  }

  .admin-item__actions {
    width: 100%;
    justify-content: flex-end;
    margin-top: 8px;
  }

  .login-card,
  .form-card {
    padding: 24px 16px;
  }

  .form-actions {
    flex-direction: column;
  }

  .form-actions .btn {
    width: 100%;
  }

  .detail-title {
    font-size: 1.5rem;
  }

  .detail-price {
    font-size: 1.25rem;
  }

  .gallery-main {
    max-height: 300px;
  }
}