:root {
  --primary: #FF6B35;
  --primary-dark: #E55A2B;
  --primary-light: #FF8C61;
  --secondary: #004E89;
  --secondary-light: #1A6FB5;
  --accent-green: #2EC4B6;
  --accent-pink: #E71D36;
  --accent-yellow: #FFD166;
  --accent-purple: #7B2D8E;
  --bg: #FFFBF5;
  --card-bg: #ffffff;
  --text: #2D2D2D;
  --text-light: #7A7A7A;
  --border: #F0EBE3;
  --shadow: 0 2px 8px rgba(0,0,0,0.08);
  --shadow-hover: 0 8px 24px rgba(255,107,53,0.18);
  --radius: 16px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

a {
  color: var(--primary);
  text-decoration: none;
}

a:hover {
  color: var(--primary-dark);
}

button {
  cursor: pointer;
  font-family: inherit;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

header {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
  padding: 20px 0;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.logo {
  font-size: 28px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-icon {
  font-size: 32px;
}

.search-box {
  flex: 1;
  max-width: 400px;
  position: relative;
}

.search-box input {
  width: 100%;
  padding: 12px 20px 12px 45px;
  border: none;
  border-radius: 25px;
  background: rgba(255,255,255,0.2);
  color: white;
  font-size: 15px;
  transition: var(--transition);
}

.search-box input::placeholder {
  color: rgba(255,255,255,0.7);
}

.search-box input:focus {
  outline: none;
  background: rgba(255,255,255,0.3);
}

/* Banner */
.banner {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  padding: 40px 20px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.banner::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
  animation: rotate 20s linear infinite;
}

@keyframes rotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.banner-content {
  position: relative;
  z-index: 1;
}

.banner-text {
  font-size: 28px;
  font-weight: 700;
  color: white;
  text-shadow: 0 2px 10px rgba(0,0,0,0.2);
  transition: opacity 0.5s ease;
}

.banner-text.fade-out {
  opacity: 0;
}

.banner-text.fade-in {
  animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.tag-bar {
  background: white;
  padding: 15px 0;
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
  white-space: nowrap;
}

.tag-bar-content {
  display: flex;
  gap: 10px;
  padding: 0 20px;
  max-width: 1200px;
  margin: 0 auto;
}

.tag {
  padding: 6px 16px;
  border-radius: 20px;
  background: var(--bg);
  color: var(--text-light);
  font-size: 13px;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid var(--border);
}

.tag:hover {
  background: var(--accent-green);
  color: var(--text);
}

.tag.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

.main-content {
  padding: 30px 0;
  min-height: calc(100vh - 200px);
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 25px;
  padding: 0 20px;
  max-width: 1200px;
  margin: 0 auto;
}

.project-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
  cursor: pointer;
  animation: fadeInUp 0.4s ease forwards;
  opacity: 0;
}

.project-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.card-cover {
  width: 100%;
  aspect-ratio: 4/3;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

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

.card-cover-placeholder {
  font-size: 48px;
  color: rgba(255,255,255,0.6);
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.card-body {
  padding: 15px;
}

.card-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 4px;
  color: var(--text);
}

.card-author {
  font-size: 12px;
  color: var(--primary);
  font-weight: 500;
  margin-bottom: 8px;
  opacity: 0.8;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.card-pin {
  position: absolute;
  top: 10px;
  right: 10px;
  background: var(--secondary);
  padding: 4px 8px;
  border-radius: 6px;
  font-size: 12px;
}

.project-card {
  position: relative;
}

.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-light);
}

.empty-state-icon {
  font-size: 64px;
  margin-bottom: 20px;
  opacity: 0.5;
}

.empty-state h3 {
  font-size: 20px;
  margin-bottom: 10px;
}

.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: white;
  border-radius: var(--radius);
  padding: 30px;
  max-width: 500px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  transform: scale(0.9);
  transition: var(--transition);
}

.modal-overlay.active .modal {
  transform: scale(1);
}

.modal h2 {
  margin-bottom: 20px;
  color: var(--text);
}

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

.form-group label {
  display: block;
  margin-bottom: 6px;
  font-weight: 600;
  font-size: 14px;
  color: var(--text);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(102,126,234,0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 80px;
}

.upload-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 40px;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
}

.upload-zone:hover,
.upload-zone.dragover {
  border-color: var(--primary);
  background: rgba(102,126,234,0.05);
}

.upload-zone-icon {
  font-size: 48px;
  margin-bottom: 15px;
  color: var(--primary);
}

.upload-zone-text {
  color: var(--text-light);
  margin-bottom: 10px;
}

.upload-zone-hint {
  font-size: 12px;
  color: var(--text-light);
}

.progress-bar {
  width: 100%;
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
  margin-top: 15px;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--primary-dark));
  transition: width 0.3s ease;
}

.modal-actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  margin-top: 25px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 20px;
  border: none;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  line-height: 1;
}

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

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(255,107,53,0.3);
}

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

.btn-secondary:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-2px);
}

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

.btn-danger:hover {
  background: #C41A2E;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(231,29,54,0.3);
}

.btn-small {
  padding: 6px 14px;
  font-size: 12px;
}

.btn-ghost {
  background: transparent;
  color: var(--text-light);
  border: 2px solid transparent;
}

.btn-ghost:hover {
  background: var(--bg);
  color: var(--text);
}

/* Tag Colors */
.tag-color-1 { background: #FF6B6B; color: white; }
.tag-color-2 { background: #4ECDC4; color: white; }
.tag-color-3 { background: #45B7D1; color: white; }
.tag-color-4 { background: #F7DC6F; color: #333; }
.tag-color-5 { background: #BB8FCE; color: white; }
.tag-color-6 { background: #82E0AA; color: #333; }
.tag-color-7 { background: #F0B27A; color: #333; }
.tag-color-8 { background: #85C1E9; color: white; }

/* Card Tag Colors */
.card-tag {
  padding: 4px 12px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 600;
  color: white;
}

.card-tag:nth-child(8n+1) { background: #FF6B6B; }
.card-tag:nth-child(8n+2) { background: #4ECDC4; }
.card-tag:nth-child(8n+3) { background: #45B7D1; }
.card-tag:nth-child(8n+4) { background: #F7DC6F; color: #333; }
.card-tag:nth-child(8n+5) { background: #BB8FCE; }
.card-tag:nth-child(8n+6) { background: #82E0AA; color: #333; }
.card-tag:nth-child(8n+7) { background: #F0B27A; color: #333; }
.card-tag:nth-child(8n+8) { background: #85C1E9; }

footer {
  background: white;
  border-top: 1px solid var(--border);
  padding: 20px 0;
  text-align: center;
  color: var(--text-light);
  font-size: 14px;
}

@media (max-width: 768px) {
  .header-content {
    flex-direction: column;
    align-items: stretch;
  }
  
  .search-box {
    max-width: none;
  }
  
  .project-grid {
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 15px;
  }
}

@media (max-width: 480px) {
  .project-grid {
    grid-template-columns: 1fr;
  }
}

.toast {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: var(--text);
  color: white;
  padding: 12px 20px;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  z-index: 2000;
  transform: translateY(100px);
  opacity: 0;
  transition: var(--transition);
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

.toast.success {
  background: #48bb78;
}

.toast.error {
  background: #f56565;
}