:root {
  --bg: #f3f6fb;
  --panel: rgba(255, 255, 255, 0.82);
  --panel-strong: #ffffff;
  --text: #102033;
  --muted: #6b7a90;
  --line: rgba(16, 32, 51, 0.08);
  --blue: #2f6bff;
  --blue-2: #67a4ff;
  --green: #2cc58a;
  --yellow: #ffbf3c;
  --shadow: 0 24px 60px rgba(15, 29, 48, 0.12);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: Inter, system-ui, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(47, 107, 255, 0.16), transparent 28%),
    radial-gradient(circle at 85% 10%, rgba(44, 197, 138, 0.14), transparent 22%),
    linear-gradient(180deg, #f7f9fc 0%, #eef3f9 100%);
}

.auth-screen {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 24px;
  background:
    radial-gradient(circle at top left, rgba(47, 107, 255, 0.22), transparent 26%),
    radial-gradient(circle at 80% 15%, rgba(44, 197, 138, 0.2), transparent 20%),
    linear-gradient(180deg, #f8fbff 0%, #eef4fb 100%);
  z-index: 20;
}

.auth-screen[hidden] {
  display: none;
}

.auth-card {
  width: min(100%, 460px);
  padding: 30px;
  border-radius: 28px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow);
}

.auth-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}

.auth-card h1 {
  margin: 0;
  font-size: clamp(2rem, 5vw, 3rem);
  letter-spacing: -0.04em;
}

.auth-card p {
  color: var(--muted);
  line-height: 1.6;
}

.auth-fields {
  display: grid;
  gap: 12px;
  margin: 22px 0;
}

.auth-status {
  min-height: 1.4em;
  margin-top: 6px;
  color: var(--muted);
  font-size: 0.95rem;
}

.auth-status#otpStatus {
  color: var(--blue);
  font-weight: 700;
}

.auth-fields input,
.share-row input,
.share-row select,
.search input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255,255,255,0.9);
  padding: 13px 14px;
  font: inherit;
  color: var(--text);
}

.auth-actions {
  display: flex;
  gap: 12px;
}

.auth-actions .primary-btn,
.auth-actions .secondary-btn {
  flex: 1;
}

.app-shell {
  display: grid;
  grid-template-columns: 280px 1fr;
  min-height: 100vh;
}

.sidebar {
  padding: 24px;
  border-right: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.45);
  backdrop-filter: blur(18px);
}

.brand { display: flex; gap: 14px; align-items: center; margin-bottom: 24px; }
.brand-mark {
  width: 46px; height: 46px; border-radius: 14px; display: grid; place-items: center;
  color: white; font-weight: 800; background: linear-gradient(135deg, var(--blue), var(--green));
  box-shadow: var(--shadow);
}
.brand-name { font-size: 1.05rem; font-weight: 800; }
.brand-subtitle { color: var(--muted); font-size: 0.9rem; }

.compose-btn, .upload-btn, .nav-item, .primary-btn, .secondary-btn {
  border: 0; border-radius: 16px; font: inherit; cursor: pointer;
}
.compose-btn, .upload-btn {
  width: 100%; padding: 14px 16px; color: white; font-weight: 700; margin-bottom: 10px;
  box-shadow: var(--shadow);
}
.compose-btn { background: linear-gradient(135deg, var(--blue), #154ae3); }
.upload-btn { background: linear-gradient(135deg, #1cce9c, #0d9f73); }

.nav { display: grid; gap: 8px; margin: 22px 0; }
.nav-item {
  text-align: left; padding: 12px 14px; background: transparent; color: var(--text);
}
.nav-item.active, .nav-item:hover { background: rgba(47, 107, 255, 0.1); color: var(--blue); }

.tree-card {
  margin-top: 18px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.68);
}
.tree-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
  font-weight: 700;
}
.tree-home {
  border: 1px solid var(--line);
  background: white;
  color: var(--text);
  border-radius: 999px;
  padding: 6px 10px;
  cursor: pointer;
  font: inherit;
}
.tree-list {
  display: grid;
  gap: 8px;
}
.tree-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 14px;
  cursor: pointer;
  border: 1px solid transparent;
  background: rgba(255,255,255,0.8);
}
.tree-item.active {
  border-color: rgba(47, 107, 255, 0.25);
  background: rgba(47, 107, 255, 0.08);
}
.tree-item.drop-target {
  outline: 2px dashed rgba(47, 107, 255, 0.6);
}
.tree-name {
  display: flex;
  align-items: center;
  gap: 8px;
}
.tree-badge {
  color: var(--muted);
  font-size: 0.85rem;
}

.storage-card {
  margin-top: 24px; padding: 18px; border: 1px solid var(--line); border-radius: 22px;
  background: var(--panel); box-shadow: var(--shadow);
}
.storage-head { display: flex; justify-content: space-between; gap: 12px; font-size: 0.92rem; font-weight: 600; }
.storage-bar {
  height: 10px; background: #e8eef7; border-radius: 999px; overflow: hidden; margin: 14px 0 10px;
}
.storage-fill { height: 100%; width: 28%; background: linear-gradient(90deg, var(--blue), var(--green)); }
.storage-card p { margin: 0; color: var(--muted); font-size: 0.92rem; }

.main { padding: 28px; }
.topbar { display: flex; justify-content: space-between; gap: 18px; align-items: end; margin-bottom: 22px; }
.topbar h1, .hero h2, .panel h3 { margin: 0; }
.topbar p, .hero p { margin: 8px 0 0; color: var(--muted); }
.search {
  min-width: 280px; max-width: 360px; width: 100%; background: rgba(255,255,255,0.8);
  border: 1px solid var(--line); border-radius: 16px; padding: 12px 14px;
}
.search input { width: 100%; border: 0; outline: none; background: transparent; font: inherit; }

.hero {
  display: flex; justify-content: space-between; gap: 24px; padding: 24px;
  border: 1px solid var(--line); border-radius: 28px; background: var(--panel); box-shadow: var(--shadow);
}
.hero-label { color: var(--blue); font-size: 0.82rem; font-weight: 800; text-transform: uppercase; letter-spacing: 0.12em; }
.hero h2 { margin-top: 10px; font-size: clamp(1.5rem, 2vw, 2.4rem); max-width: 16ch; }
.hero-actions { display: flex; align-items: end; gap: 12px; flex-wrap: wrap; }
.crumb-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 16px;
}
.crumb {
  display: inline-flex;
  padding: 10px 12px;
  border-radius: 999px;
  background: rgba(47, 107, 255, 0.08);
  color: var(--blue);
  font-size: 0.88rem;
  font-weight: 700;
}
.crumb-back {
  border: 1px solid var(--line);
  background: white;
  color: var(--text);
  border-radius: 999px;
  padding: 10px 14px;
  cursor: pointer;
  font: inherit;
  font-weight: 700;
}
.crumb-back:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}
.primary-btn, .secondary-btn { padding: 13px 16px; font-weight: 700; }
.primary-btn { background: var(--text); color: white; }
.secondary-btn { background: white; color: var(--text); border: 1px solid var(--line); }

.content-grid {
  display: grid;
  grid-template-columns: 1.2fr 1.8fr 0.9fr;
  gap: 18px;
  margin-top: 18px;
}
.panel {
  min-height: 220px; padding: 18px; border-radius: 24px; border: 1px solid var(--line);
  background: var(--panel-strong); box-shadow: var(--shadow);
}
.panel-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-bottom: 16px; }
.panel-head span { color: var(--muted); font-size: 0.92rem; }
.detail-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.bulk-bar {
  display: grid;
  gap: 10px;
  margin-bottom: 14px;
  padding: 14px;
  border-radius: 18px;
  background: rgba(47, 107, 255, 0.06);
  border: 1px solid rgba(47, 107, 255, 0.12);
}
.bulk-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.danger-btn { background: #d94848; }
.folder-strip { display: grid; gap: 12px; }
.folder-card {
  padding: 14px; border-radius: 18px; background: linear-gradient(180deg, #f7faff, #edf3ff);
  border: 1px solid rgba(47, 107, 255, 0.12); cursor: pointer;
}
.folder-card.active { outline: 2px solid rgba(47, 107, 255, 0.25); }
.folder-top { display: flex; justify-content: space-between; gap: 12px; align-items: center; }
.folder-icon, .file-icon {
  width: 38px; height: 38px; border-radius: 13px; display: grid; place-items: center;
  color: white; font-weight: 800;
}
.folder-meta, .file-meta { color: var(--muted); font-size: 0.88rem; margin-top: 8px; }

.file-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 12px; }
.file-card {
  position: relative;
  padding: 14px; border-radius: 18px; border: 1px solid var(--line); background: #fbfcfe; cursor: pointer;
}
.file-card.selected { border-color: rgba(47, 107, 255, 0.45); background: rgba(47, 107, 255, 0.05); }
.file-card[draggable="true"] { cursor: grab; }
.file-card.dragging { opacity: 0.55; }
.file-card.active { border-color: rgba(47, 107, 255, 0.35); box-shadow: 0 12px 28px rgba(47, 107, 255, 0.12); }
.file-check {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 18px;
  height: 18px;
}
.file-title { margin: 12px 0 4px; font-weight: 700; }
.file-row { display: flex; justify-content: space-between; gap: 12px; color: var(--muted); font-size: 0.86rem; }
.dropzone { position: relative; border-style: dashed; border-color: rgba(47, 107, 255, 0.18); }
.dropzone.dragover { background: rgba(103, 164, 255, 0.06); }
.dropzone.file-drop-target { outline: 2px dashed rgba(47, 107, 255, 0.5); }
.drop-hint {
  margin-top: 14px; padding: 14px; border-radius: 16px; background: rgba(47, 107, 255, 0.06);
  color: var(--muted); font-size: 0.92rem;
}

.details-view { display: grid; gap: 14px; }
.detail-item { padding: 14px; border-radius: 18px; background: #f8fbff; border: 1px solid var(--line); }
.detail-label { color: var(--muted); font-size: 0.84rem; margin-bottom: 6px; }
.detail-value { font-weight: 700; word-break: break-word; }

.preview-pane,
.share-box {
  margin-bottom: 14px;
  padding: 14px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: #f8fbff;
}
.share-box + .share-box { margin-top: 14px; }
.preview-pane {
  min-height: 140px;
  white-space: pre-wrap;
}
.preview-editor {
  width: 100%;
  min-height: 120px;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 12px;
  font: inherit;
  resize: vertical;
  background: white;
}
.preview-save { margin-top: 10px; }
.preview-empty { color: var(--muted); }
.preview-title { font-weight: 800; margin-bottom: 8px; }
.preview-meta { color: var(--muted); font-size: 0.88rem; margin-bottom: 10px; }
.share-head, .share-row {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  align-items: center;
}
.share-row { margin: 10px 0; }
.share-row select, #shareLink {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px 12px;
  font: inherit;
  background: white;
}
#shareLink { margin-top: 10px; }
#roleSelect, #userInput, #authUser, #authPass {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px 12px;
  font: inherit;
  background: white;
}
#inviteUser, #inviteRole {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px 12px;
  font: inherit;
  background: white;
}

.context-menu {
  position: fixed;
  z-index: 50;
  min-width: 180px;
  padding: 8px;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.98);
  box-shadow: var(--shadow);
}
.context-menu button {
  display: block;
  width: 100%;
  padding: 10px 12px;
  border: 0;
  background: transparent;
  text-align: left;
  cursor: pointer;
  border-radius: 12px;
  font: inherit;
}
.context-menu button:hover {
  background: rgba(47, 107, 255, 0.08);
}

@media (max-width: 1100px) {
  .app-shell, .content-grid { grid-template-columns: 1fr; }
  .sidebar { border-right: 0; border-bottom: 1px solid var(--line); }
  .topbar, .hero { flex-direction: column; align-items: stretch; }
  .search { max-width: none; min-width: 0; }
}