:root {
  --bg: #f4f6fa;
  --panel: #ffffff;
  --panel-2: #eef1f6;
  --text: #1c2333;
  --muted: #6b7487;
  --accent: #4f8ff7;
  --accent-hover: #3d7ce4;
  --danger: #e5534b;
  --border: #dde2ec;
  --shadow: 0 4px 24px rgba(20, 30, 60, .10);
  --radius: 10px;
}
/* Auto dark: follow the OS unless the user forced light in-app. */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #12151c;
    --panel: #1a1f2a;
    --panel-2: #232a38;
    --text: #e7ebf3;
    --muted: #8b93a5;
    --accent: #5b96f5;
    --accent-hover: #78aaf8;
    --danger: #ef6a63;
    --border: #2c3444;
    --shadow: 0 4px 24px rgba(0, 0, 0, .4);
  }
}
/* Forced dark via the in-app toggle. */
:root[data-theme="dark"] {
  --bg: #12151c;
  --panel: #1a1f2a;
  --panel-2: #232a38;
  --text: #e7ebf3;
  --muted: #8b93a5;
  --accent: #5b96f5;
  --accent-hover: #78aaf8;
  --danger: #ef6a63;
  --border: #2c3444;
  --shadow: 0 4px 24px rgba(0, 0, 0, .4);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
}
.hidden { display: none !important; }
.muted { color: var(--muted); }
h1, h2, h3 { margin: 0; font-weight: 600; }
h2 { font-size: 18px; }

button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }
input, select, textarea {
  font: inherit;
  color: var(--text);
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 9px 12px;
  outline: none;
  width: 100%;
}
input:focus, textarea:focus { border-color: var(--accent); }

.btn {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 14px;
  font-weight: 500;
  white-space: nowrap;
  transition: background .12s;
}
.btn:hover { background: var(--border); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { background: var(--accent-hover); }
.btn.danger { color: var(--danger); }
.btn.danger:hover { background: color-mix(in srgb, var(--danger) 12%, transparent); }
.btn.ghost { border-color: transparent; background: transparent; }
.btn.sm { padding: 5px 10px; font-size: 13px; }
.btn.wide { width: 100%; }
.icon-btn {
  padding: 6px 9px;
  border-radius: 8px;
  font-size: 15px;
  line-height: 1;
}
.icon-btn:hover { background: var(--panel-2); }

/* ---- Auth ---- */
.auth-screen {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.auth-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
  padding: 36px 32px;
  width: 100%;
  max-width: 380px;
  text-align: center;
}
.auth-logo { font-size: 42px; margin-bottom: 8px; }
.auth-card h1 { font-size: 24px; margin-bottom: 4px; }
.auth-card form { display: flex; flex-direction: column; gap: 12px; margin-top: 22px; }
.form-error {
  color: var(--danger);
  font-size: 13px;
  background: color-mix(in srgb, var(--danger) 10%, transparent);
  border-radius: 8px;
  padding: 8px;
}

/* ---- Layout ---- */
.main-screen { display: flex; height: 100vh; }
.sidebar {
  width: 230px;
  flex-shrink: 0;
  background: var(--panel);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 16px 12px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 17px;
  font-weight: 700;
  padding: 6px 10px 18px;
}
.brand-icon { font-size: 22px; }
.sidebar nav { display: flex; flex-direction: column; gap: 2px; }
.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  text-align: left;
  padding: 9px 12px;
  border-radius: 8px;
  color: var(--muted);
  font-weight: 500;
}
.nav-item:hover { background: var(--panel-2); color: var(--text); }
.nav-item.active { background: color-mix(in srgb, var(--accent) 14%, transparent); color: var(--accent); }
.sidebar-footer { margin-top: auto; display: flex; flex-direction: column; gap: 10px; }
.usage-widget { padding: 0 6px; }
.usage-bar { height: 6px; background: var(--panel-2); border-radius: 3px; overflow: hidden; }
#usage-fill { height: 100%; background: var(--accent); width: 0; border-radius: 3px; }
.usage-text { font-size: 12px; color: var(--muted); margin-top: 5px; }
.user-row { display: flex; align-items: center; gap: 4px; padding: 4px 6px; }
.user-name { flex: 1; font-weight: 600; overflow: hidden; text-overflow: ellipsis; }

.content { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.topbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
}
.search-wrap { flex: 1; max-width: 420px; }
.topbar-actions { display: flex; align-items: center; gap: 8px; margin-left: auto; }
.mobile-only { display: none; }

.view { flex: 1; overflow-y: auto; display: flex; flex-direction: column; }
.pathbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 20px 6px;
  flex-wrap: wrap;
  min-height: 44px;
}
.breadcrumbs { display: flex; align-items: center; flex-wrap: wrap; gap: 2px; font-size: 14px; }
.crumb { padding: 4px 8px; border-radius: 6px; color: var(--muted); }
.crumb:hover { background: var(--panel-2); color: var(--text); }
.crumb.current { color: var(--text); font-weight: 600; }
.crumb-sep { color: var(--muted); }

.selection-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 5px 10px;
  font-size: 13px;
}

/* ---- File area ---- */
.file-area { flex: 1; position: relative; padding: 8px 20px 40px; }
.drop-overlay {
  position: absolute;
  inset: 8px;
  border: 2px dashed var(--accent);
  border-radius: 14px;
  background: color-mix(in srgb, var(--accent) 8%, transparent);
  display: none;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 600;
  color: var(--accent);
  pointer-events: none;
  z-index: 5;
}
.file-area.dragover .drop-overlay { display: flex; }

.file-list.grid-mode {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 10px;
}
.file-list.list-mode { display: flex; flex-direction: column; }

.entry {
  border-radius: var(--radius);
  cursor: pointer;
  user-select: none;
  position: relative;
  border: 1px solid transparent;
}
.entry:hover { background: var(--panel-2); }
.entry.selected { background: color-mix(in srgb, var(--accent) 14%, transparent); border-color: var(--accent); }

.grid-mode .entry { padding: 14px 10px 10px; text-align: center; }
.grid-mode .entry .thumb {
  height: 84px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 44px;
  margin-bottom: 8px;
}
.grid-mode .entry .thumb img {
  max-width: 100%;
  max-height: 84px;
  border-radius: 6px;
  object-fit: cover;
}
.grid-mode .entry .ename {
  font-size: 13px;
  word-break: break-word;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}
.grid-mode .entry .emeta { display: none; }

.list-mode .entry {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 12px;
}
.list-mode .entry .thumb { font-size: 22px; width: 32px; text-align: center; flex-shrink: 0; }
.list-mode .entry .thumb img { width: 30px; height: 30px; object-fit: cover; border-radius: 4px; }
.list-mode .entry .ename { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.list-mode .entry .emeta { color: var(--muted); font-size: 13px; white-space: nowrap; }

.empty-state { text-align: center; padding: 80px 20px; color: var(--muted); }
.empty-icon { font-size: 52px; margin-bottom: 10px; }

/* ---- Cards (shares, users) ---- */
.cards { display: flex; flex-direction: column; gap: 10px; padding: 8px 20px 30px; }
.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
}
.card-row { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.card-title { font-weight: 600; overflow-wrap: anywhere; }
.card-sub { font-size: 13px; color: var(--muted); margin-top: 3px; overflow-wrap: anywhere; }
.card-actions { margin-left: auto; display: flex; gap: 6px; flex-shrink: 0; }
.badge {
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent) 15%, transparent);
  color: var(--accent);
}
.badge.warn { background: color-mix(in srgb, var(--danger) 14%, transparent); color: var(--danger); }

.settings-form { display: flex; flex-direction: column; gap: 12px; max-width: 420px; }
.settings-form label { font-size: 13px; color: var(--muted); display: flex; flex-direction: column; gap: 5px; }

/* ---- Upload panel ---- */
.upload-panel {
  position: fixed;
  right: 20px;
  bottom: 20px;
  width: 320px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow);
  padding: 12px 14px;
  z-index: 60;
}
.upload-header { display: flex; align-items: center; justify-content: space-between; font-weight: 600; margin-bottom: 8px; }
.upload-bar { height: 6px; background: var(--panel-2); border-radius: 3px; overflow: hidden; }
#upload-fill { height: 100%; width: 0; background: var(--accent); transition: width .2s; }
.upload-detail { font-size: 12px; color: var(--muted); margin-top: 6px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ---- Preview ---- */
.preview {
  position: fixed;
  inset: 0;
  background: rgba(10, 12, 18, .92);
  z-index: 80;
  display: flex;
  flex-direction: column;
}
.preview-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 18px;
  color: #eee;
  gap: 10px;
}
.preview-top .icon-btn:hover { background: rgba(255,255,255,.15); }
#preview-name { font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.preview-body {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: auto;
  padding: 0 60px 20px;
  min-height: 0;
}
.preview-body img, .preview-body video { max-width: 100%; max-height: 100%; border-radius: 6px; }
.preview-body iframe { width: 100%; height: 100%; border: none; background: #fff; border-radius: 6px; }
.preview-body pre {
  background: var(--panel);
  color: var(--text);
  padding: 20px;
  border-radius: 10px;
  max-width: 900px;
  width: 100%;
  max-height: 100%;
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-word;
  font-size: 13px;
}
.preview-body textarea {
  max-width: 900px;
  width: 100%;
  height: 100%;
  background: var(--panel);
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 13px;
  resize: none;
}
.preview-body .no-preview { color: #bbb; text-align: center; }
.preview-body .no-preview .big { font-size: 60px; margin-bottom: 12px; }
.preview-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  font-size: 34px;
  color: #ddd;
  padding: 18px 12px;
  border-radius: 10px;
  z-index: 81;
}
.preview-nav:hover { background: rgba(255,255,255,.12); }
.preview-nav.prev { left: 8px; }
.preview-nav.next { right: 8px; }
.preview-editor-actions { position: absolute; bottom: 26px; right: 70px; display: flex; gap: 8px; z-index: 82; }

/* ---- Modal ---- */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(10, 12, 18, .5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 90;
  padding: 20px;
}
.modal {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow);
  width: 100%;
  max-width: 440px;
  padding: 22px;
  max-height: 85vh;
  overflow-y: auto;
}
.modal h3 { margin-bottom: 14px; }
.modal-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 18px; }
.modal .field { margin-bottom: 12px; }
.modal .field label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 5px; }
.modal .check { display: flex; align-items: center; gap: 8px; font-size: 14px; }
.modal .check input { width: auto; }
.share-link-row { display: flex; gap: 8px; margin-top: 6px; }
.share-link-row input { font-size: 13px; }
.folder-picker {
  border: 1px solid var(--border);
  border-radius: 8px;
  max-height: 260px;
  overflow-y: auto;
}
.folder-picker .fp-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  cursor: pointer;
  width: 100%;
  text-align: left;
}
.folder-picker .fp-item:hover { background: var(--panel-2); }
.folder-picker .fp-item.selected { background: color-mix(in srgb, var(--accent) 14%, transparent); }

/* ---- Context menu ---- */
.context-menu {
  position: fixed;
  z-index: 95;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: var(--shadow);
  padding: 5px;
  min-width: 180px;
}
.context-menu button {
  display: flex;
  gap: 10px;
  width: 100%;
  text-align: left;
  padding: 8px 12px;
  border-radius: 7px;
  font-size: 14px;
}
.context-menu button:hover { background: var(--panel-2); }
.context-menu button.danger { color: var(--danger); }
.context-menu hr { border: none; border-top: 1px solid var(--border); margin: 4px 0; }

/* ---- Toasts ---- */
.toasts {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 100;
  align-items: center;
}
.toast {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: var(--shadow);
  padding: 10px 18px;
  font-size: 14px;
  animation: toast-in .18s ease;
  max-width: 90vw;
}
.toast.error { border-color: var(--danger); color: var(--danger); }
@keyframes toast-in { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; } }

/* ---- Share page ---- */
.share-page { max-width: 860px; margin: 0 auto; padding: 30px 20px; }
.share-head { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; margin-bottom: 18px; }
.share-head .big-icon { font-size: 40px; }

/* ---- Mobile ---- */
@media (max-width: 760px) {
  .sidebar {
    position: fixed;
    z-index: 50;
    height: 100%;
    left: -240px;
    transition: left .18s ease;
    box-shadow: var(--shadow);
  }
  .sidebar.open { left: 0; }
  .mobile-only { display: inline-block; }
  .topbar { padding: 10px 12px; }
  .btn span.label { display: none; }
  .file-area { padding: 8px 12px 40px; }
  .pathbar { padding: 12px 12px 6px; }
  .preview-body { padding: 0 10px 16px; }
  .preview-nav { display: none; }
}