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

:root {
  --bg: #0f0f0f;
  --surface: #1a1a1a;
  --surface2: #242424;
  --border: #333;
  --text: #e8e8e8;
  --text-dim: #888;
  --accent: #4f8cff;
  --accent-hover: #3a73e0;
  --danger: #e05555;
  --danger-hover: #c04040;
  --radius: 10px;
  --radius-sm: 6px;
}

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

.hidden { display: none !important; }

/* Screens */
.screen { min-height: 100vh; }

/* Login */
#login-screen {
  display: flex;
  align-items: center;
  justify-content: center;
}

.login-box {
  background: var(--surface);
  padding: 3rem 2.5rem;
  border-radius: var(--radius);
  width: 100%;
  max-width: 380px;
  text-align: center;
}

.login-box h1 {
  font-size: 1.8rem;
  margin-bottom: 0.3rem;
}

.subtitle {
  color: var(--text-dim);
  margin-bottom: 2rem;
}

#login-form input {
  width: 100%;
  padding: 0.75rem 1rem;
  margin-bottom: 1rem;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 1rem;
  outline: none;
  transition: border 0.2s;
}

#login-form input:focus {
  border-color: var(--accent);
}

.error {
  color: var(--danger);
  font-size: 0.85rem;
  margin-top: 0.5rem;
}

/* Buttons */
button {
  cursor: pointer;
  border: none;
  font-size: 0.95rem;
  font-family: inherit;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  padding: 0.7rem 1.4rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  transition: background 0.2s;
}
.btn-primary:hover { background: var(--accent-hover); }

.btn-danger {
  background: var(--danger);
  color: #fff;
  padding: 0.7rem 1.4rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  transition: background 0.2s;
}
.btn-danger:hover { background: var(--danger-hover); }

.btn-text {
  background: none;
  color: var(--text-dim);
  padding: 0.5rem 0.75rem;
  transition: color 0.2s;
}
.btn-text:hover { color: var(--text); }

#login-form button[type="submit"] {
  width: 100%;
  padding: 0.75rem;
  background: var(--accent);
  color: #fff;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  transition: background 0.2s;
}
#login-form button[type="submit"]:hover { background: var(--accent-hover); }

/* Top Bar */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 2rem;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 50;
}

.logo { font-size: 1.2rem; }

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

#user-label {
  color: var(--text-dim);
  font-size: 0.9rem;
}

/* View */
.view { padding: 2rem; }

.view-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.view-header h2 { flex: 1; font-size: 1.5rem; }

.view-header-actions {
  display: flex;
  gap: 0.75rem;
}

/* Folders Grid */
.folders-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1rem;
}

.folder-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  cursor: pointer;
  transition: border-color 0.2s, transform 0.15s;
  position: relative;
}

.folder-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.folder-card .folder-icon {
  font-size: 2rem;
  margin-bottom: 0.75rem;
}

.folder-card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.4rem;
  word-break: break-word;
}

.folder-card .folder-meta {
  color: var(--text-dim);
  font-size: 0.85rem;
}

.folder-card .folder-actions {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  display: flex;
  gap: 0.25rem;
  opacity: 0;
  transition: opacity 0.2s;
}

.folder-card:hover .folder-actions { opacity: 1; }

.folder-actions button {
  background: var(--surface2);
  color: var(--text-dim);
  border: 1px solid var(--border);
  width: 28px;
  height: 28px;
  border-radius: 4px;
  font-size: 0.8rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.folder-actions button:hover {
  color: var(--text);
  border-color: var(--text-dim);
}

/* Photos Grid */
.photos-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 0.75rem;
}

.photo-card {
  position: relative;
  aspect-ratio: 1;
  border-radius: var(--radius-sm);
  overflow: hidden;
  cursor: pointer;
  background: var(--surface2);
}

.photo-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.2s;
}

.photo-card:hover img { transform: scale(1.05); }

.photo-card .photo-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 0.5rem;
  background: linear-gradient(transparent, rgba(0,0,0,0.8));
  font-size: 0.75rem;
  color: #ccc;
  opacity: 0;
  transition: opacity 0.2s;
}

.photo-card:hover .photo-overlay { opacity: 1; }

/* Upload */
.upload-label {
  cursor: pointer;
  display: inline-flex;
  align-items: center;
}

.upload-progress {
  margin-bottom: 1.5rem;
  padding: 1rem;
  background: var(--surface);
  border-radius: var(--radius-sm);
}

.progress-bar {
  height: 6px;
  background: var(--surface2);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 0.5rem;
}

.progress-fill {
  height: 100%;
  background: var(--accent);
  width: 0%;
  transition: width 0.3s;
}

#upload-status {
  font-size: 0.85rem;
  color: var(--text-dim);
}

/* Empty State */
.empty-msg {
  text-align: center;
  color: var(--text-dim);
  padding: 4rem 1rem;
  font-size: 1.1rem;
}

/* Modal */
.modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.85);
}

.modal-content {
  position: relative;
  max-width: 90vw;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.modal-close {
  position: absolute;
  top: -2.5rem;
  right: 0;
  background: none;
  color: #fff;
  font-size: 2rem;
  z-index: 2;
}

#modal-img {
  max-width: 90vw;
  max-height: 70vh;
  object-fit: contain;
  border-radius: var(--radius-sm);
}

.modal-info {
  margin-top: 1rem;
  text-align: center;
}

#modal-name {
  font-weight: 600;
  margin-bottom: 0.25rem;
}

#modal-size {
  color: var(--text-dim);
  font-size: 0.85rem;
  margin-bottom: 0.75rem;
}

.modal-actions {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
}

/* Responsive */
@media (max-width: 600px) {
  .view { padding: 1rem; }
  .topbar { padding: 0.75rem 1rem; }
  .folders-grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); }
  .photos-grid { grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); }
  .login-box { margin: 1rem; padding: 2rem 1.5rem; }
}