:root {
  --bg-primary: #0a0a0a;
  --bg-secondary: #141414;
  --bg-tertiary: #1f1f1f;
  --text-primary: #f5f5f5;
  --text-secondary: #a0a0a0;
  --text-muted: #666666;
  --accent: #e0e0e0;
  --accent-hover: #ffffff;
  --border: #2a2a2a;
  --shadow: rgba(0, 0, 0, 0.4);
  --overlay: rgba(0, 0, 0, 0.92);
  --radius: 8px;
  --radius-lg: 12px;
  --transition: 0.2s ease;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.5;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input, select {
  font-family: inherit;
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 56px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  z-index: 100;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.back-link {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-secondary);
  font-size: 14px;
  transition: color var(--transition);
}

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

.logo {
  font-size: 18px;
  font-weight: 500;
  letter-spacing: -0.02em;
}

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

.nav-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  color: var(--text-secondary);
  border-radius: var(--radius);
  transition: all var(--transition);
}

.nav-btn:hover {
  color: var(--text-primary);
  background: var(--bg-tertiary);
}

/* Filter Bar */
.filter-bar {
  position: fixed;
  top: 56px;
  left: 0;
  right: 0;
  height: 48px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 20px;
  gap: 8px;
  overflow-x: auto;
  z-index: 99;
}

.filter-btn {
  padding: 6px 14px;
  font-size: 13px;
  color: var(--text-secondary);
  background: var(--bg-tertiary);
  border-radius: 20px;
  white-space: nowrap;
  transition: all var(--transition);
}

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

.filter-btn.active {
  color: var(--bg-primary);
  background: var(--accent);
}

/* Gallery */
.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 12px;
  padding: 124px 20px 40px;
  max-width: 1600px;
  margin: 0 auto;
}

.gallery-item {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: var(--bg-tertiary);
  cursor: pointer;
  transition: transform var(--transition);
}

.gallery-item:hover {
  transform: scale(1.01);
}

.gallery-item img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

.gallery-item::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.3) 0%, transparent 40%);
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--transition);
}

.gallery-item:hover::after {
  opacity: 1;
}

/* Loading */
.loading {
  display: flex;
  justify-content: center;
  padding: 40px;
}

.spinner {
  width: 32px;
  height: 32px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* Modal */
.modal {
  position: fixed;
  inset: 0;
  background: var(--overlay);
  z-index: 200;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal.active {
  display: flex;
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  color: var(--text-secondary);
  background: var(--bg-tertiary);
  border-radius: 50%;
  transition: all var(--transition);
  z-index: 10;
}

.modal-close:hover {
  color: var(--text-primary);
  background: var(--border);
}

.modal-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  background: var(--bg-tertiary);
  border-radius: 50%;
  transition: all var(--transition);
}

.modal-prev { left: 16px; }
.modal-next { right: 16px; }

.modal-nav:hover {
  color: var(--text-primary);
  background: var(--border);
}

.modal-content {
  display: flex;
  flex-direction: column;
  max-width: 90vw;
  max-height: 90vh;
  overflow: hidden;
}

.modal-content img {
  max-width: 100%;
  max-height: 70vh;
  object-fit: contain;
  border-radius: var(--radius);
}

.modal-info {
  padding: 20px 0;
  max-width: 800px;
}

.modal-meta {
  display: flex;
  gap: 12px;
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.modal-meta span:first-child {
  padding: 2px 8px;
  background: var(--bg-tertiary);
  border-radius: 4px;
}

/* Comments */
.comments-section {
  border-top: 1px solid var(--border);
  padding-top: 16px;
}

.comments-section h3 {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.comments-list {
  max-height: 150px;
  overflow-y: auto;
  margin-bottom: 12px;
}

.comment {
  padding: 10px 12px;
  background: var(--bg-tertiary);
  border-radius: var(--radius);
  margin-bottom: 8px;
}

.comment-text {
  font-size: 14px;
  color: var(--text-primary);
}

.comment-time {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 4px;
}

.comment-form {
  display: flex;
  gap: 8px;
}

.comment-form input {
  flex: 1;
  padding: 10px 14px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: 14px;
  outline: none;
  transition: border-color var(--transition);
}

.comment-form input:focus {
  border-color: var(--text-muted);
}

.comment-form button {
  padding: 10px 16px;
  background: var(--accent);
  color: var(--bg-primary);
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 500;
  transition: opacity var(--transition);
}

.comment-form button:hover {
  opacity: 0.9;
}

/* Login Page */
.login-page {
  display: flex;
  align-items: center;
  justify-content: center;
}

.login-container {
  width: 100%;
  max-width: 360px;
  padding: 20px;
}

.login-box {
  padding: 40px 32px;
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  text-align: center;
}

.login-box h1 {
  font-size: 24px;
  font-weight: 500;
  margin-bottom: 8px;
}

.login-subtitle {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.login-box input {
  width: 100%;
  padding: 14px 16px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: 15px;
  outline: none;
  margin-bottom: 16px;
  transition: border-color var(--transition);
}

.login-box input:focus {
  border-color: var(--text-muted);
}

.login-box button {
  width: 100%;
  padding: 14px;
  background: var(--accent);
  color: var(--bg-primary);
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 500;
  transition: opacity var(--transition);
}

.login-box button:hover {
  opacity: 0.9;
}

.login-error {
  color: #e57373;
  font-size: 13px;
  margin-top: 12px;
}

/* Upload Page */
.upload-page {
  padding-top: 56px;
}

.upload-container {
  max-width: 640px;
  margin: 0 auto;
  padding: 40px 20px;
}

.upload-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
  background: var(--bg-secondary);
  border: 2px dashed var(--border);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition);
}

.upload-area:hover,
.upload-area.dragover {
  border-color: var(--text-muted);
  background: var(--bg-tertiary);
}

.upload-area svg {
  color: var(--text-muted);
  margin-bottom: 16px;
}

.upload-area p {
  color: var(--text-secondary);
  font-size: 14px;
}

.upload-form {
  margin-top: 24px;
}

.preview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 12px;
  margin-bottom: 24px;
}

.preview-item {
  position: relative;
  aspect-ratio: 1;
  border-radius: var(--radius);
  overflow: hidden;
}

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

.preview-remove {
  position: absolute;
  top: 4px;
  right: 4px;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.6);
  color: white;
  border-radius: 50%;
  font-size: 16px;
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.form-group input,
.form-group select {
  width: 100%;
  padding: 12px 14px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: 14px;
  outline: none;
}

.form-group input:focus,
.form-group select:focus {
  border-color: var(--text-muted);
}

.upload-btn {
  width: 100%;
  padding: 14px;
  background: var(--accent);
  color: var(--bg-primary);
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 500;
  margin-top: 24px;
  transition: opacity var(--transition);
}

.upload-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.upload-btn:not(:disabled):hover {
  opacity: 0.9;
}

.upload-progress {
  margin-top: 24px;
}

.progress-bar {
  height: 4px;
  background: var(--bg-tertiary);
  border-radius: 2px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--accent);
  transition: width 0.3s ease;
}

.progress-text {
  text-align: center;
  color: var(--text-secondary);
  font-size: 14px;
  margin-top: 12px;
}

.upload-result {
  text-align: center;
  padding: 40px;
}

.success-text {
  color: var(--accent);
  font-size: 18px;
  margin-bottom: 24px;
}

.upload-more {
  padding: 12px 24px;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border-radius: var(--radius);
  font-size: 14px;
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 80px 20px;
  color: var(--text-secondary);
}

.empty-state svg {
  margin-bottom: 16px;
  opacity: 0.5;
}

/* Responsive */
@media (max-width: 768px) {
  .gallery {
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
    padding: 120px 12px 24px;
  }

  .modal-nav {
    display: none;
  }

  .filter-bar {
    padding: 0 12px;
  }
}