/* ====== DESIGN TOKENS ====== */
:root {
  --green: #0f4c35;
  --green-light: #1a6b4a;
  --lime: #a8e06c;
  --lime-light: #c4ed9a;
  --cream: #faf8f3;
  --dark: #1a1a1a;
  --warm: #e8e2d6;
  --orange: #e8733a;
  --orange-light: #f09060;
  --red: #e74c3c;
  --gray: #666;
  --gray-light: #999;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 2px 12px rgba(0,0,0,0.06);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.1);
  --transition: 0.2s ease;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: 'DM Sans', sans-serif;
  background: var(--cream);
  color: var(--dark);
  overflow-x: hidden;
  min-height: 100vh;
}

/* ====== TYPOGRAPHY ====== */
h1, h2, h3 {
  font-family: 'Space Grotesk', sans-serif;
  letter-spacing: -0.5px;
}

a { color: var(--green); text-decoration: none; }
a:hover { color: var(--orange); }

/* ====== NAV ====== */
.app-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 32px;
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
}

.logo {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--green);
  letter-spacing: -0.5px;
  text-decoration: none;
}

.logo span { color: var(--orange); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--dark);
  padding: 8px 16px;
  border-radius: 100px;
  transition: var(--transition);
}

.nav-links a:hover {
  background: var(--warm);
  color: var(--green);
}

.nav-links a.active {
  background: var(--green);
  color: white;
}

.nav-btn {
  background: var(--green) !important;
  color: white !important;
  padding: 10px 24px !important;
  border-radius: 100px !important;
  font-weight: 600 !important;
  transition: var(--transition) !important;
}

.nav-btn:hover {
  background: var(--green-light) !important;
  transform: translateY(-1px);
}

.nav-btn-outline {
  border: 2px solid var(--warm) !important;
  color: var(--dark) !important;
  padding: 8px 20px !important;
  border-radius: 100px !important;
  font-weight: 500 !important;
  transition: var(--transition) !important;
}

.nav-btn-outline:hover {
  border-color: var(--green) !important;
  color: var(--green) !important;
  background: transparent !important;
}

.hamburger {
  display: none;
  background: none;
  border: 2px solid var(--warm);
  border-radius: 10px;
  font-size: 1.3rem;
  padding: 6px 12px;
  cursor: pointer;
  color: var(--dark);
}

.mobile-menu {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: 0 32px 16px;
  max-width: 1200px;
  margin: 0 auto;
}

.mobile-menu.open { display: flex; }

.mobile-menu a {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-weight: 500;
  color: var(--dark);
  transition: var(--transition);
}

.mobile-menu a:hover { background: var(--warm); }

@media (max-width: 768px) {
  .app-nav { padding: 14px 20px; }
  .nav-links { display: none; }
  .hamburger { display: block; }
}

/* ====== MAIN CONTENT ====== */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 32px 80px;
  min-height: calc(100vh - 160px);
}

@media (max-width: 768px) {
  main { padding: 16px 20px 60px; }
}

/* ====== FOOTER ====== */
.app-footer {
  border-top: 2px solid var(--warm);
  padding: 24px 32px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--gray-light);
}

.app-footer .f-logo {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  color: var(--green);
  font-size: 1.1rem;
  margin-bottom: 4px;
}

.app-footer .f-logo span { color: var(--orange); }

/* ====== PAGE HEADER ====== */
.page-header {
  margin-bottom: 32px;
}

.page-header h1 {
  font-size: 2rem;
  color: var(--green);
  margin-bottom: 8px;
}

.page-header p {
  color: var(--gray);
  font-size: 1.05rem;
}

.page-header-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  flex-wrap: wrap;
}

/* ====== BUTTONS ====== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 100px;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

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

.btn-primary:hover {
  background: var(--green-light);
  color: white;
  transform: translateY(-1px);
}

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

.btn-orange:hover {
  background: var(--orange-light);
  color: white;
  transform: translateY(-1px);
}

.btn-lime {
  background: var(--lime);
  color: var(--green);
}

.btn-lime:hover {
  background: var(--lime-light);
  color: var(--green);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: var(--dark);
  border: 2px solid var(--warm);
}

.btn-outline:hover {
  border-color: var(--green);
  color: var(--green);
}

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

.btn-danger:hover { opacity: 0.9; }

.btn-sm {
  padding: 8px 18px;
  font-size: 0.85rem;
}

.btn-block {
  width: 100%;
  justify-content: center;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

/* ====== CARDS ====== */
.card {
  background: white;
  border-radius: var(--radius);
  border: 2px solid var(--warm);
  overflow: hidden;
  transition: var(--transition);
}

.card:hover {
  border-color: var(--lime);
  box-shadow: var(--shadow);
}

.card-body { padding: 20px; }

/* ====== ITEM CARDS ====== */
.items-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}

.item-card {
  cursor: pointer;
  transition: var(--transition);
}

.item-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.item-card-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  background: var(--warm);
  display: block;
}

.item-card-placeholder {
  width: 100%;
  height: 200px;
  background: linear-gradient(135deg, var(--warm) 0%, #d4cfc4 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  color: var(--gray-light);
}

.item-card-body {
  padding: 16px;
}

.item-card-title {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--dark);
  margin-bottom: 6px;
  line-height: 1.3;
}

.item-card-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.item-badge {
  font-size: 0.75rem;
  font-weight: 500;
  padding: 3px 10px;
  border-radius: 100px;
  background: rgba(15, 76, 53, 0.08);
  color: var(--green);
}

.item-badge-condition {
  background: rgba(232, 115, 58, 0.1);
  color: var(--orange);
}

.item-card-owner {
  margin-top: 10px;
  font-size: 0.85rem;
  color: var(--gray);
}

/* ====== ITEM DETAIL ====== */
.item-detail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}

@media (max-width: 768px) {
  .item-detail { grid-template-columns: 1fr; gap: 24px; }
}

.item-detail-img {
  width: 100%;
  border-radius: var(--radius);
  border: 2px solid var(--warm);
  object-fit: cover;
  max-height: 500px;
}

.item-detail-placeholder {
  width: 100%;
  height: 350px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--warm) 0%, #d4cfc4 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 5rem;
  color: var(--gray-light);
}

.item-detail-info h1 {
  font-size: 1.8rem;
  color: var(--green);
  margin-bottom: 12px;
}

.item-detail-info .description {
  font-size: 1.05rem;
  line-height: 1.7;
  color: #555;
  margin: 20px 0;
}

.owner-card {
  background: rgba(15, 76, 53, 0.04);
  border-radius: var(--radius-sm);
  padding: 16px;
  margin: 20px 0;
}

.owner-card h4 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--gray);
  margin-bottom: 8px;
}

.owner-card .owner-name {
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--dark);
}

.owner-card .owner-detail {
  font-size: 0.9rem;
  color: var(--gray);
  margin-top: 2px;
}

/* ====== TRADE PROPOSAL ====== */
.trade-proposal-section {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 2px solid var(--warm);
}

.trade-proposal-section h3 {
  font-size: 1.2rem;
  color: var(--green);
  margin-bottom: 16px;
}

.my-items-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}

.my-item-option {
  cursor: pointer;
  border: 2px solid var(--warm);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: var(--transition);
  background: white;
}

.my-item-option:hover {
  border-color: var(--lime);
}

.my-item-option.selected {
  border-color: var(--orange);
  box-shadow: 0 0 0 2px var(--orange);
}

.my-item-option img {
  width: 100%;
  height: 90px;
  object-fit: cover;
  display: block;
}

.my-item-option .placeholder {
  width: 100%;
  height: 90px;
  background: var(--warm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.my-item-option .title {
  padding: 8px;
  font-size: 0.8rem;
  font-weight: 500;
  line-height: 1.3;
  color: var(--dark);
}

/* ====== TRADES LIST ====== */
.trade-card {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 16px;
  align-items: center;
  padding: 20px;
  margin-bottom: 16px;
}

@media (max-width: 640px) {
  .trade-card {
    grid-template-columns: 1fr;
    text-align: center;
  }
}

.trade-item {
  display: flex;
  align-items: center;
  gap: 12px;
}

@media (max-width: 640px) {
  .trade-item { justify-content: center; }
}

.trade-item img {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-sm);
  object-fit: cover;
  border: 2px solid var(--warm);
}

.trade-item .placeholder {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-sm);
  background: var(--warm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.trade-item-info .title {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--dark);
}

.trade-item-info .owner {
  font-size: 0.8rem;
  color: var(--gray);
}

.trade-arrow {
  font-size: 1.5rem;
  color: var(--orange);
  text-align: center;
}

.trade-status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 14px;
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

.trade-status-pending { background: #fff3cd; color: #856404; }
.trade-status-accepted { background: #d4edda; color: #155724; }
.trade-status-declined { background: #f8d7da; color: #721c24; }
.trade-status-cancelled { background: #e2e3e5; color: #383d41; }

.trade-actions {
  display: flex;
  gap: 8px;
  margin-top: 12px;
}

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

.form-group label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--dark);
  margin-bottom: 6px;
}

.form-group .hint {
  font-size: 0.8rem;
  color: var(--gray);
  margin-top: 4px;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="search"],
select,
textarea {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid var(--warm);
  border-radius: var(--radius-sm);
  font-family: 'DM Sans', sans-serif;
  font-size: 1rem;
  color: var(--dark);
  background: white;
  transition: var(--transition);
}

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--green);
  box-shadow: 0 0 0 3px rgba(15, 76, 53, 0.1);
}

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

select { cursor: pointer; }

.form-card {
  max-width: 480px;
  margin: 40px auto;
}

.form-card .card-body {
  padding: 32px;
}

.form-card h2 {
  font-size: 1.6rem;
  color: var(--green);
  margin-bottom: 8px;
  text-align: center;
}

.form-card .subtitle {
  text-align: center;
  color: var(--gray);
  margin-bottom: 28px;
}

.form-divider {
  text-align: center;
  color: var(--gray-light);
  font-size: 0.85rem;
  margin: 20px 0;
}

/* ====== IMAGE UPLOAD ====== */
.image-upload {
  border: 2px dashed var(--warm);
  border-radius: var(--radius);
  padding: 32px;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.image-upload:hover {
  border-color: var(--lime);
  background: rgba(168, 224, 108, 0.05);
}

.image-upload.has-image {
  padding: 0;
  border-style: solid;
}

.image-upload img {
  width: 100%;
  max-height: 300px;
  object-fit: cover;
  display: block;
}

.image-upload input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.image-upload-text {
  color: var(--gray);
}

.image-upload-text .icon {
  font-size: 2rem;
  margin-bottom: 8px;
}

.image-upload-text p {
  font-size: 0.9rem;
}

/* ====== FILTERS ====== */
.filters-bar {
  display: flex;
  gap: 12px;
  margin-bottom: 24px;
  flex-wrap: wrap;
  align-items: center;
}

.search-input {
  flex: 1;
  min-width: 200px;
  position: relative;
}

.search-input input {
  padding-left: 40px;
}

.search-input::before {
  content: '🔍';
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.9rem;
  z-index: 1;
}

.category-pills {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.category-pill {
  padding: 8px 18px;
  border-radius: 100px;
  border: 2px solid var(--warm);
  background: white;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--dark);
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.category-pill:hover {
  border-color: var(--lime);
}

.category-pill.active {
  background: var(--green);
  color: white;
  border-color: var(--green);
}

/* ====== TABS ====== */
.tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 24px;
  border-bottom: 2px solid var(--warm);
  padding-bottom: 0;
}

.tab {
  padding: 10px 20px;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--gray);
  background: none;
  border: none;
  cursor: pointer;
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  transition: var(--transition);
}

.tab:hover { color: var(--dark); }

.tab.active {
  color: var(--green);
  border-bottom-color: var(--green);
}

.tab .badge {
  background: var(--orange);
  color: white;
  font-size: 0.7rem;
  padding: 1px 7px;
  border-radius: 100px;
  margin-left: 6px;
}

/* ====== EMPTY STATE ====== */
.empty-state {
  text-align: center;
  padding: 60px 20px;
}

.empty-state .icon {
  font-size: 3rem;
  margin-bottom: 16px;
}

.empty-state h3 {
  font-size: 1.3rem;
  color: var(--green);
  margin-bottom: 8px;
}

.empty-state p {
  color: var(--gray);
  font-size: 1rem;
  max-width: 400px;
  margin: 0 auto 20px;
}

/* ====== JOIN PAGE ====== */
.join-hero {
  text-align: center;
  padding: 60px 20px;
}

.join-hero h1 {
  font-size: 2.5rem;
  color: var(--green);
  margin-bottom: 16px;
}

.join-hero h1 span { color: var(--orange); }

.join-hero p {
  font-size: 1.1rem;
  color: var(--gray);
  max-width: 500px;
  margin: 0 auto 32px;
  line-height: 1.6;
}

.join-price {
  display: inline-flex;
  align-items: center;
  gap: 16px;
  background: var(--green);
  color: white;
  padding: 20px 36px;
  border-radius: var(--radius);
  margin-bottom: 32px;
}

.join-price .amount {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--lime);
}

.join-price .label {
  font-size: 0.95rem;
  line-height: 1.4;
  opacity: 0.9;
  text-align: left;
}

.join-features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  max-width: 600px;
  margin: 32px auto;
}

.join-feature {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.95rem;
  color: var(--dark);
}

.join-feature .check {
  width: 24px;
  height: 24px;
  background: var(--lime);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  color: var(--green);
  font-weight: 700;
  flex-shrink: 0;
}

/* ====== ALERTS ====== */
.alert {
  padding: 14px 20px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  margin-bottom: 20px;
}

.alert-error {
  background: #fde8e8;
  color: #c0392b;
  border: 1px solid #f5c6cb;
}

.alert-success {
  background: #d4edda;
  color: #155724;
  border: 1px solid #c3e6cb;
}

.alert-info {
  background: rgba(15, 76, 53, 0.06);
  color: var(--green);
  border: 1px solid rgba(15, 76, 53, 0.15);
}

/* ====== LOADING ====== */
.loading {
  text-align: center;
  padding: 40px;
  color: var(--gray);
}

.spinner {
  display: inline-block;
  width: 32px;
  height: 32px;
  border: 3px solid var(--warm);
  border-top-color: var(--green);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ====== RESPONSIVE GRID ====== */
@media (max-width: 640px) {
  .items-grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 12px; }
  .item-card-img, .item-card-placeholder { height: 150px; }
  .page-header h1 { font-size: 1.6rem; }
  .join-hero h1 { font-size: 1.8rem; }
  .join-price { flex-direction: column; text-align: center; }
  .join-price .label { text-align: center; }
  .filters-bar { flex-direction: column; }
  .form-card .card-body { padding: 24px 20px; }
}

/* ====== OTHER ITEMS ROW ====== */
.other-items-section {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 2px solid var(--warm);
}

.other-items-section h3 {
  font-size: 1.1rem;
  color: var(--green);
  margin-bottom: 16px;
}

.other-items-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 12px;
}

.other-item-card {
  cursor: pointer;
  border: 2px solid var(--warm);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: var(--transition);
}

.other-item-card:hover {
  border-color: var(--lime);
}

.other-item-card img {
  width: 100%;
  height: 90px;
  object-fit: cover;
}

.other-item-card .placeholder {
  width: 100%;
  height: 90px;
  background: var(--warm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.other-item-card .title {
  padding: 8px;
  font-size: 0.8rem;
  font-weight: 500;
}

/* ====== TRADE PROPOSAL MESSAGE ====== */
.trade-message {
  margin-top: 12px;
}

.trade-message textarea {
  min-height: 80px;
}