:root {
  --bg: #080810;
  --bg2: #0c0c1a;
  --bg3: #12122a;
  --bg4: #1a1a38;
  --surface: #101020;
  --surface2: #161630;
  --surface3: #1e1e42;
  --border: #28285a;
  --border-light: #3a3a7a;
  --text: #e8e8f0;
  --text2: #b0b0cc;
  --text3: #7a7a9a;
  --accent: #6d5cfa;
  --accent-h: #8a7cff;
  --accent-glow: rgba(109,92,250,0.12);
  --accent-glow2: rgba(109,92,250,0.25);
  --green: #42c98a;
  --danger: #e05272;
  --danger-glow: rgba(224,82,114,0.12);
  --orange: #f0a050;
  --radius: 10px;
  --radius-sm: 6px;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --mono: 'JetBrains Mono', monospace;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.6);
  --transition: 0.18s ease;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}
html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
}
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: var(--bg2); }
::-webkit-scrollbar-thumb { background: var(--border-light); border-radius: 5px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

button, input, select {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  outline: none;
  touch-action: manipulation;
}
button { cursor: pointer; }
svg { flex-shrink: 0; display: block; }

.view {
  display: none;
  flex-direction: column;
  height: 100%;
  width: 100%;
  max-width: 860px;
  margin: 0 auto;
  padding: 0 14px 14px;
  animation: fadeIn 0.25s ease;
}
.view.active { display: flex; }
@keyframes fadeIn {
  0% { opacity: 0; transform: translateY(6px); }
  100% { opacity: 1; transform: translateY(0); }
}
.scroll-area {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 6px 2px 12px;
  -webkit-overflow-scrolling: touch;
}

/* ===== HOME ===== */
.home-header {
  padding: 14px 0 10px;
  flex-shrink: 0;
}
.logo-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
}
.logo-mark {
  width: 32px;
  height: 32px;
  background: var(--accent-glow);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-h);
}
.logo-name {
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.3px;
}
.logo-name span { color: var(--accent-h); }
.security-chip {
  font-size: 0.6rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  color: var(--text3);
  background: var(--bg3);
  padding: 2px 10px;
  border-radius: 20px;
  border: 1px solid var(--border);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}
.security-chip svg { opacity: 0.6; }

.home-user-wrap {
  display: flex;
  align-items: center;
  gap: 5px;
  margin-left: 8px;
  cursor: pointer;
  padding: 3px 8px 3px 3px;
  border-radius: 20px;
  border: 1px solid transparent;
  transition: var(--transition);
}
.home-user-wrap:hover {
  border-color: var(--border-light);
  background: var(--bg3);
}
.home-user-dot {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  flex-shrink: 0;
  border: 2px solid var(--border-light);
}
.home-user-name {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text2);
  max-width: 100px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.home-user-chevron {
  color: var(--text3);
  width: 14px;
  height: 14px;
}

.tunnel-input-wrap {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0 4px 0 12px;
  transition: var(--transition);
  margin-top: 6px;
}
.tunnel-input-wrap:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
.tunnel-input {
  flex: 1;
  padding: 10px 0;
  font-size: 0.95rem;
  background: transparent;
  min-width: 0;
}
.tunnel-input::placeholder { color: var(--text3); }
.tunnel-input-icon {
  color: var(--text3);
  opacity: 0.5;
}
.enter-btn {
  background: var(--accent);
  color: #fff;
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  font-weight: 600;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition);
  flex-shrink: 0;
  height: 40px;
  margin-top: 6px;
  width: 100%;
  justify-content: center;
}
.enter-btn:hover:not(:disabled) {
  background: var(--accent-h);
  transform: scale(0.97);
}
.enter-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}
.enter-btn svg { width: 18px; height: 18px; }

.section-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text3);
  padding: 10px 2px 6px;
}
.section-label svg { color: var(--accent-h); }

.fav-list {
  display: flex;
  flex-direction: column;
  gap: 3px;
}
.fav-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  border-radius: var(--radius-sm);
  background: var(--surface);
  border: 1px solid transparent;
  transition: var(--transition);
}
.fav-item:hover {
  border-color: var(--border);
  background: var(--bg3);
}
.fav-icon-wrap {
  color: var(--accent-h);
  opacity: 0.7;
  flex-shrink: 0;
}
.fav-item-name {
  flex: 1;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  padding: 2px 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.fav-item-name:hover { color: var(--accent-h); }
.fav-item-actions {
  display: flex;
  gap: 3px;
  flex-shrink: 0;
}
.icon-btn {
  padding: 4px;
  border-radius: var(--radius-sm);
  color: var(--text3);
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
}
.icon-btn:hover {
  background: var(--bg4);
  color: var(--text);
}
.icon-btn.danger:hover {
  background: var(--danger-glow);
  color: var(--danger);
}
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 28px 12px 20px;
  color: var(--text3);
  font-size: 0.85rem;
  text-align: center;
  gap: 10px;
}
.empty-icon { opacity: 0.3; }

/* ===== TUNNEL TOPBAR ===== */
.tunnel-topbar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 0 6px;
  flex-shrink: 0;
  border-bottom: 1px solid var(--border);
}
.back-btn {
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  color: var(--text3);
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}
.back-btn:hover {
  background: var(--bg3);
  color: var(--text);
}
.tunnel-title-wrap {
  flex: 1;
  min-width: 0;
}
.tunnel-title {
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: -0.2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.topbar-actions {
  display: flex;
  gap: 3px;
  flex-shrink: 0;
}
.topbar-btn {
  padding: 4px 6px;
  border-radius: var(--radius-sm);
  color: var(--text3);
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
}
.topbar-btn:hover {
  background: var(--bg3);
  color: var(--text);
}
.topbar-btn.danger-btn:hover {
  background: var(--danger-glow);
  color: var(--danger);
}
.topbar-btn.fav-active {
  color: #f7c948;
}
.topbar-btn.fav-active:hover {
  color: #f7c948;
  background: rgba(247, 201, 72, 0.12);
}

/* ===== CONTRIBUTORS STRIP ===== */
.contributors-strip {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: nowrap;
  overflow-x: auto;
  padding: 4px 6px;
  border-bottom: 1px solid var(--border);
  background: var(--bg2);
  flex-shrink: 0;
  min-height: 36px;
}
.contributors-strip::-webkit-scrollbar { height: 2px; }
.contributors-strip::-webkit-scrollbar-thumb { background: var(--border-light); border-radius: 2px; }
.contributor-chip {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.75rem;
  color: var(--text2);
  background: var(--bg3);
  padding: 2px 8px 2px 4px;
  border-radius: 20px;
  border: 1px solid var(--border);
  cursor: default;
  white-space: nowrap;
}
.contributor-chip.me {
  border-color: var(--accent);
  cursor: pointer;
}
.contributor-chip.me:hover {
  background: var(--accent-glow);
}
.contributor-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  flex-shrink: 0;
  border: 1px solid rgba(255,255,255,0.1);
}
.me-label {
  font-size: 0.55rem;
  color: var(--accent-h);
  font-weight: 600;
  margin-left: 2px;
}

/* ===== GROTTES ===== */
.grottes-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 0 4px;
  flex-shrink: 0;
}
.add-grotte-btn {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--accent-h);
  padding: 4px 12px 4px 8px;
  border-radius: 20px;
  border: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  gap: 4px;
  transition: var(--transition);
}
.add-grotte-btn:hover {
  background: var(--accent-glow);
  border-color: var(--accent);
}
.add-grotte-btn svg { width: 16px; height: 16px; }

.grottes-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-bottom: 6px;
}

.grotte-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
}
.grotte-card:hover {
  border-color: var(--border-light);
}
.grotte-card-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  cursor: pointer;
  transition: var(--transition);
}
.grotte-card-header:hover {
  background: var(--bg3);
}
.grotte-info {
  flex: 1;
  min-width: 0;
}
.grotte-name {
  font-weight: 600;
  font-size: 0.9rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.grotte-meta {
  font-size: 0.65rem;
  color: var(--text3);
}
.grotte-actions {
  display: flex;
  gap: 3px;
  flex-shrink: 0;
  align-items: center;
}
.grotte-actions .icon-btn {
  width: 28px;
  height: 28px;
}
.grotte-actions .upload-icon-btn {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  color: var(--text3);
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg3);
  border: 1px solid var(--border);
  position: relative;
}
.grotte-actions .upload-icon-btn:hover {
  background: var(--accent-glow);
  color: var(--accent-h);
  border-color: var(--accent);
}
.grotte-actions .upload-icon-btn input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
  width: 100%;
  height: 100%;
}
.grotte-actions .options-btn {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  color: var(--text3);
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg3);
  border: 1px solid var(--border);
}
.grotte-actions .options-btn:hover {
  background: var(--accent-glow);
  color: var(--accent-h);
  border-color: var(--accent);
}
.grotte-chevron {
  color: var(--text3);
  transition: var(--transition);
  flex-shrink: 0;
  width: 18px;
  height: 18px;
}
.grotte-card.open .grotte-chevron {
  transform: rotate(90deg);
}

.grotte-detail {
  display: none;
  padding: 0 10px 10px;
  border-top: 1px solid var(--border);
  animation: slideDown 0.2s ease;
}
.grotte-card.open .grotte-detail {
  display: block;
}
@keyframes slideDown {
  0% { opacity: 0; transform: translateY(-4px); }
  100% { opacity: 1; transform: translateY(0); }
}

.upload-progress {
  display: none;
  flex-direction: column;
  gap: 2px;
  padding: 4px 0;
}
.upload-progress.active {
  display: flex;
}
.upload-progress-text {
  font-size: 0.7rem;
  color: var(--text3);
}
.upload-progress-inner {
  height: 4px;
  background: var(--accent);
  border-radius: 4px;
  width: 0%;
  transition: width 0.3s ease;
}

/* ===== FILES ===== */
.files-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 2px 0;
}
.files-list.active {
  display: flex;
}
.files-grid {
  display: none;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 6px;
  padding: 4px 0;
}
.files-grid.active {
  display: grid;
}

.file-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  background: var(--bg2);
  transition: var(--transition);
  border: 1px solid transparent;
}
.file-row:hover {
  background: var(--bg3);
  border-color: var(--border);
}
.file-row .file-thumb-icon {
  flex-shrink: 0;
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text3);
  border-radius: 4px;
  background: var(--bg4);
}
.file-row .file-thumb-icon img {
  width: 26px;
  height: 26px;
  object-fit: cover;
  border-radius: 4px;
}
.file-row .file-row-info {
  flex: 1;
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.file-row .file-row-name {
  font-size: 0.85rem;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 200px;
}
.file-row .file-row-meta {
  font-size: 0.7rem;
  color: var(--text3);
  display: flex;
  align-items: center;
  gap: 5px;
  flex-wrap: wrap;
}
.file-row .file-row-meta .user-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  flex-shrink: 0;
  border: 1px solid rgba(255,255,255,0.08);
}
.file-row .file-row-actions {
  display: flex;
  gap: 3px;
  flex-shrink: 0;
}
.file-row .file-row-actions .icon-btn {
  width: 26px;
  height: 26px;
  padding: 3px;
}

.file-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
  position: relative;
  display: flex;
  flex-direction: column;
}
.file-card:hover {
  border-color: var(--border-light);
  transform: translateY(-1px);
}
.file-card.dragging {
  opacity: 0.3;
  transform: scale(0.95);
}
.file-card.drag-over-card {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-glow2);
}
.file-thumb {
  width: 100%;
  aspect-ratio: 1/1;
  background: var(--bg3);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text3);
  overflow: hidden;
}
.file-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.file-thumb svg {
  width: 32px;
  height: 32px;
  opacity: 0.4;
}
.file-info {
  padding: 4px 6px 6px;
  flex: 1;
  min-width: 0;
}
.file-name {
  font-size: 0.75rem;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.file-added-by {
  font-size: 0.65rem;
  color: var(--text3);
  display: flex;
  align-items: center;
  gap: 3px;
}
.file-card-actions {
  position: absolute;
  top: 4px;
  right: 4px;
  display: flex;
  gap: 2px;
  opacity: 0;
  transition: var(--transition);
}
.file-card:hover .file-card-actions {
  opacity: 1;
}
.file-action-btn {
  padding: 3px;
  border-radius: var(--radius-sm);
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(4px);
  color: var(--text3);
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
}
.file-action-btn:hover {
  background: var(--danger-glow);
  color: var(--danger);
}

.file-deleting {
  position: relative;
  opacity: 0.6;
  pointer-events: none;
}
.file-deleting .spinner-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 11;
  background: rgba(0,0,0,0.3);
  border-radius: inherit;
}
.spinner-overlay .spinner {
  width: 20px;
  height: 20px;
  border-width: 2.5px;
}

/* ===== MODALS ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(6px);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 16px;
  animation: fadeIn 0.2s ease;
}
.modal-overlay.active {
  display: flex;
}
.modal-overlay.modal-centered .modal {
  max-width: 400px;
}
.modal {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px 18px;
  max-width: 460px;
  width: 100%;
  box-shadow: var(--shadow);
  animation: slideUp 0.25s ease;
}
@keyframes slideUp {
  0% { opacity: 0; transform: translateY(12px) scale(0.97); }
  100% { opacity: 1; transform: translateY(0) scale(1); }
}
.modal-title {
  font-weight: 700;
  font-size: 1rem;
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}
.modal-title svg { color: var(--accent-h); }
.modal-text {
  font-size: 0.85rem;
  color: var(--text2);
  margin-bottom: 12px;
  line-height: 1.5;
}
.modal-input {
  width: 100%;
  padding: 8px 12px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  transition: var(--transition);
  margin-bottom: 12px;
}
.modal-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
.modal-input::placeholder { color: var(--text3); }
.modal-actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
  margin-top: 4px;
}
.modal-btn {
  padding: 6px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text2);
  border: 1px solid transparent;
  transition: var(--transition);
}
.modal-btn:hover {
  background: var(--bg3);
  color: var(--text);
}
.modal-btn.primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.modal-btn.primary:hover {
  background: var(--accent-h);
}
.modal-btn.danger {
  color: var(--danger);
  border-color: var(--danger-glow);
}
.modal-btn.danger:hover {
  background: var(--danger-glow);
}
.color-options {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin: 6px 0 12px;
}
.color-opt {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  cursor: pointer;
  border: 2px solid transparent;
  transition: var(--transition);
}
.color-opt:hover { transform: scale(1.08); }
.color-opt.selected {
  border-color: #fff;
  box-shadow: 0 0 0 2px var(--accent);
}

/* ===== TOAST ===== */
.toast-container {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 100000;
  display: flex;
  flex-direction: column;
  gap: 4px;
  align-items: center;
  pointer-events: none;
  max-width: 90%;
}
.toast {
  padding: 6px 18px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 0.8rem;
  color: var(--text2);
  box-shadow: var(--shadow);
  animation: toastIn 0.3s ease;
  pointer-events: auto;
  backdrop-filter: blur(8px);
  text-align: center;
}
.toast.success {
  border-color: var(--green);
  color: var(--green);
}
.toast.error {
  border-color: var(--danger);
  color: var(--danger);
}
.toast.out {
  animation: toastOut 0.25s ease forwards;
}
@keyframes toastIn {
  0% { opacity: 0; transform: translateY(12px) scale(0.95); }
  100% { opacity: 1; transform: translateY(0) scale(1); }
}
@keyframes toastOut {
  0% { opacity: 1; transform: scale(1); }
  100% { opacity: 0; transform: scale(0.92); }
}

.spinner {
  width: 18px;
  height: 18px;
  border: 2.5px solid var(--border);
  border-top-color: var(--accent-h);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  flex-shrink: 0;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ===== FILE VIEWER (fix styles) ===== */
.file-viewer-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: rgba(0,0,0,0.88);
  backdrop-filter: blur(12px);
  display: none;
  flex-direction: column;
  padding: 16px;
  animation: fadeIn 0.2s ease;
}
.file-viewer-overlay.active {
  display: flex;
}
.file-viewer-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 0 10px;
  flex-shrink: 0;
}
.viewer-close {
  padding: 4px;
  border-radius: var(--radius-sm);
  color: var(--text3);
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
}
.viewer-close:hover {
  background: var(--bg3);
  color: var(--text);
}
.file-viewer-name {
  flex: 1;
  font-weight: 600;
  font-size: 0.95rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.file-viewer-content {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  min-height: 0;
}
.file-viewer-content img,
.file-viewer-content video {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  border-radius: var(--radius-sm);
}
.file-viewer-content iframe {
  width: 100%;
  height: 100%;
  border: none;
  border-radius: var(--radius-sm);
  background: var(--bg2);
}
.file-viewer-footer {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 0 4px;
  flex-shrink: 0;
  justify-content: center;
}
.viewer-action-btn {
  font-size: 0.8rem;
  font-weight: 500;
  padding: 5px 14px 5px 8px;
  border-radius: 20px;
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 5px;
  color: var(--text2);
  transition: var(--transition);
  background: var(--surface);
  cursor: pointer;
}
.viewer-action-btn:hover {
  background: var(--bg3);
  border-color: var(--border-light);
  color: var(--text);
}
.viewer-action-btn.danger-btn {
  border-color: var(--danger-glow);
  color: var(--danger);
}
.viewer-action-btn.danger-btn:hover {
  border-color: var(--danger);
  background: var(--danger-glow);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 480px) {
  .view { padding: 0 8px 8px; }
  .home-header { padding: 8px 0 6px; }
  .tunnel-input { font-size: 0.85rem; padding: 8px 0; }
  .enter-btn { font-size: 0.75rem; padding: 6px 10px; height: 36px; }
  .grotte-card-header { padding: 6px 8px; }
  .grotte-detail { padding: 0 8px 8px; }
  .file-row .file-row-name { max-width: 120px; }
  .files-grid { grid-template-columns: repeat(auto-fill, minmax(90px, 1fr)); }
  .modal { padding: 16px; margin: 8px; }
  .home-user-name { max-width: 70px; font-size: 0.7rem; }
  .topbar-btn { width: 28px; height: 28px; }
  .tunnel-title { font-size: 0.9rem; }
}
@media (max-width: 380px) {
  .file-row .file-row-meta .user-name { display: none; }
  .file-row .file-row-name { max-width: 80px; }
  .files-grid { grid-template-columns: repeat(auto-fill, minmax(75px, 1fr)); }
  .file-thumb svg { width: 28px; height: 28px; }
  .file-info { padding: 2px 4px 4px; }
  .file-name { font-size: 0.6rem; }
}