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

:root {
  --bg: #0f172a;
  --bg-light: #1e293b;
  --surface: rgba(255,255,255,0.05);
  --surface-hover: rgba(255,255,255,0.08);
  --text: #f1f5f9;
  --text-secondary: #94a3b8;
  --accent: #60a5fa;
  --accent-hover: #93bbfd;
  --accent-glow: rgba(96,165,250,0.15);
  --border: rgba(255,255,255,0.08);
  --border-hover: rgba(255,255,255,0.15);
  --danger: #ef4444;
  --danger-hover: #f87171;
  --success: #22c55e;
  --warning: #f59e0b;
  --radius: 12px;
  --radius-sm: 8px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

/* Header */
.app-header {
  background: linear-gradient(135deg, #1e3a5f 0%, #2563eb 50%, #7c3aed 100%);
  padding: 1.5rem;
  text-align: center;
  box-shadow: 0 2px 12px rgba(0,0,0,0.3);
}

.app-header h1 {
  font-size: 1.5rem;
  font-weight: 700;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.app-header h1 svg { width: 28px; height: 28px; }

.app-header p {
  color: rgba(255,255,255,0.7);
  font-size: 0.85rem;
  margin-top: 0.25rem;
}

/* Main container */
.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

/* Cards */
.card {
  background: var(--bg-light);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  margin-bottom: 1.5rem;
}

.card h2 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text);
}

.card h2 svg {
  width: 20px;
  height: 20px;
  vertical-align: -3px;
  margin-right: 0.4rem;
  color: var(--accent);
}

/* Form inputs */
.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 0.35rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.form-group input,
.form-group select {
  width: 100%;
  padding: 0.65rem 0.85rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 0.95rem;
  font-family: inherit;
  outline: none;
  transition: border-color 0.2s;
}

.form-group input:focus {
  border-color: var(--accent);
}

.form-group input::placeholder {
  color: #475569;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.6rem 1.2rem;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
}

.btn svg { width: 16px; height: 16px; }

.btn-primary {
  background: var(--accent);
  color: #0f172a;
}
.btn-primary:hover { background: var(--accent-hover); }

.btn-danger {
  background: rgba(239,68,68,0.15);
  color: var(--danger);
  border: 1px solid rgba(239,68,68,0.2);
}
.btn-danger:hover {
  background: rgba(239,68,68,0.25);
  color: var(--danger-hover);
}

.btn-ghost {
  background: var(--surface);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}
.btn-ghost:hover {
  background: var(--surface-hover);
  color: var(--text);
  border-color: var(--border-hover);
}

.btn-sm {
  padding: 0.4rem 0.8rem;
  font-size: 0.8rem;
}

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

/* Share list */
.share-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.share-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1rem 1.25rem;
  transition: border-color 0.2s;
}

.share-item:hover {
  border-color: var(--border-hover);
}

.share-item-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.share-item-header h3 {
  font-size: 0.95rem;
  font-weight: 600;
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.share-badge {
  font-size: 0.7rem;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  font-weight: 500;
  white-space: nowrap;
}

.badge-password {
  background: rgba(96,165,250,0.15);
  color: var(--accent);
}

.badge-expired {
  background: rgba(239,68,68,0.15);
  color: var(--danger);
}

.badge-expires {
  background: rgba(245,158,11,0.15);
  color: var(--warning);
}

.share-meta {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
}

.share-actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

/* File list */
.file-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: 1rem;
}

.file-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem 0.85rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  transition: border-color 0.2s;
}

.file-item:hover {
  border-color: var(--border-hover);
}

.file-icon {
  width: 32px;
  height: 32px;
  border-radius: 6px;
  background: rgba(96,165,250,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--accent);
}

.file-icon svg { width: 16px; height: 16px; }

.file-name {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.file-size {
  color: var(--text-secondary);
  font-size: 0.75rem;
  white-space: nowrap;
}

.file-actions {
  display: flex;
  gap: 0.35rem;
}

/* File list header (count + download all) */
.file-list-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-top: 1rem;
}

.file-list-header + .file-list {
  margin-top: 0.5rem;
}

.file-list-count {
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* Upload area */
.upload-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 2.5rem 1.5rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
  margin-bottom: 1rem;
}

.upload-zone:hover,
.upload-zone.dragover {
  border-color: var(--accent);
  background: var(--accent-glow);
}

.upload-zone svg {
  width: 40px;
  height: 40px;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
}

.upload-zone p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.upload-zone .browse {
  color: var(--accent);
  font-weight: 500;
}

/* Progress bar */
.progress-container {
  margin-top: 1rem;
}

.progress-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  margin-bottom: 0.5rem;
}

.progress-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
  font-size: 0.85rem;
}

.progress-filename {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
  margin-right: 0.75rem;
}

.progress-pct {
  color: var(--accent);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

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

.progress-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 3px;
  transition: width 0.15s ease;
  width: 0%;
}

.progress-fill.done {
  background: var(--success);
}

.progress-fill.error {
  background: var(--danger);
}

/* Copy link */
.link-box {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.link-input {
  flex: 1;
  padding: 0.5rem 0.75rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--accent);
  font-size: 0.8rem;
  font-family: 'SF Mono', 'Fira Code', monospace;
  outline: none;
  cursor: text;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--bg-light);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1.25rem;
  font-size: 0.85rem;
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
  opacity: 0;
  transition: all 0.3s ease;
  z-index: 1000;
  pointer-events: none;
}

.toast.visible {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

.toast.success { border-color: var(--success); color: var(--success); }
.toast.error { border-color: var(--danger); color: var(--danger); }

/* Empty state */
.empty-state {
  text-align: center;
  padding: 2rem 1rem;
  color: var(--text-secondary);
}

.empty-state svg {
  width: 48px;
  height: 48px;
  margin-bottom: 0.75rem;
  opacity: 0.4;
}

.empty-state p {
  font-size: 0.9rem;
}

/* Loading spinner */
.spinner {
  display: inline-block;
  width: 18px;
  height: 18px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

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

/* Utilities */
.hidden { display: none !important; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.text-center { text-align: center; }
.text-danger { color: var(--danger); }
.text-secondary { color: var(--text-secondary); }
.text-sm { font-size: 0.8rem; }

/* Admin header bar */
.admin-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}

.admin-bar h2 {
  margin: 0;
  font-size: 1.1rem;
}

/* Modal overlay */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 1rem;
}

.modal {
  background: var(--bg-light);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  max-width: 440px;
  width: 100%;
  box-shadow: 0 16px 48px rgba(0,0,0,0.5);
}

.modal h3 {
  font-size: 1.1rem;
  margin-bottom: 1rem;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
  margin-top: 1.5rem;
}

/* Back link */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.85rem;
  font-family: inherit;
  margin-bottom: 1rem;
  transition: color 0.2s;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.back-link:hover { color: var(--text); }
.back-link svg { width: 16px; height: 16px; }

@media (max-width: 600px) {
  .container { padding: 1.5rem 1rem 3rem; }
  .card { padding: 1.5rem; }
  .form-row { grid-template-columns: 1fr; }
  .share-actions { flex-direction: column; }
  .share-actions .btn { width: 100%; }
  .link-box { flex-direction: column; }
}