:root {
  color-scheme: light dark;
  --fg: #1a1a1a;
  --bg: #f6f6f6;
  --card-bg: #fff;
  --accent: #2563eb;
  --danger: #b91c1c;
  --muted: #6b7280;
}
@media (prefers-color-scheme: dark) {
  :root {
    --fg: #f4f4f5;
    --bg: #0b0d12;
    --card-bg: #14161c;
    --accent: #60a5fa;
    --danger: #f87171;
    --muted: #9ca3af;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font: 16px/1.45 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--fg);
  background: var(--bg);
  min-height: 100vh;
  display: grid;
  place-items: center;
}
.card {
  background: var(--card-bg);
  max-width: 36rem;
  width: 100%;
  margin: 2rem 1rem;
  padding: 2rem;
  border-radius: 0.75rem;
  box-shadow: 0 4px 24px rgba(0,0,0,0.08);
}
h1 { margin-top: 0; }
h2 { font-size: 1rem; margin: 1.25rem 0 0.5rem; color: var(--muted); }
label {
  display: block;
  margin: 0.75rem 0;
}
input[type=text], input[type=email], input {
  display: block;
  width: 100%;
  padding: 0.5rem 0.75rem;
  margin-top: 0.25rem;
  font: inherit;
  color: inherit;
  background: var(--bg);
  border: 1px solid var(--muted);
  border-radius: 0.375rem;
}
textarea {
  width: 100%;
  font: 13px/1.4 ui-monospace, SFMono-Regular, monospace;
  padding: 0.5rem;
  background: var(--bg);
  color: inherit;
  border: 1px solid var(--muted);
  border-radius: 0.375rem;
}
button {
  font: inherit;
  padding: 0.5rem 1rem;
  background: var(--accent);
  color: white;
  border: 0;
  border-radius: 0.375rem;
  cursor: pointer;
}
button[disabled] { opacity: 0.5; cursor: not-allowed; }
button + button { margin-left: 0.5rem; }
.status { color: var(--muted); margin-top: 1rem; min-height: 1.25em; }
.status.error { color: var(--danger); }
.status.ok    { color: var(--accent); }

/* ===================================================================
 * Dashboard / app shell (Phase 3)
 *
 * `body.app-page` opts out of the centred-card layout used by the
 * login + register pages.
 * ================================================================ */

body.app-page {
  display: block;
  place-items: initial;
}

.app {
  display: grid;
  grid-template-columns: 16rem 1fr;
  grid-template-rows: 3rem 1fr;
  grid-template-areas:
    "bar     bar"
    "sidebar main";
  min-height: 100vh;
}

.app-bar {
  grid-area: bar;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0 1rem;
  background: var(--card-bg);
  border-bottom: 1px solid color-mix(in srgb, var(--muted) 25%, transparent);
  height: 3rem;
}
.app-bar .brand {
  color: inherit;
  font-weight: 600;
  text-decoration: none;
}
.app-bar .spacer { flex: 1; }
.app-bar .hamburger {
  display: none;
  font-size: 1.25rem;
  padding: 0.25rem 0.5rem;
  background: transparent;
  color: inherit;
  border: 1px solid color-mix(in srgb, var(--muted) 30%, transparent);
}
.app-bar .user-menu {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.app-bar button.ghost {
  background: transparent;
  color: inherit;
  border: 1px solid color-mix(in srgb, var(--muted) 35%, transparent);
}
.app-bar button.ghost:hover {
  background: color-mix(in srgb, var(--muted) 12%, transparent);
}
.app-bar .username {
  color: var(--muted);
}
.app-bar .badges {
  display: inline-flex;
  gap: 0.25rem;
}
.app-bar .badge {
  font-size: 0.75rem;
  padding: 0.125rem 0.5rem;
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--muted) 35%, transparent);
}
.app-bar .badge-on  { color: var(--accent); border-color: color-mix(in srgb, var(--accent) 40%, transparent); }
.app-bar .badge-off { color: var(--muted); }

.sidebar {
  grid-area: sidebar;
  background: var(--card-bg);
  border-right: 1px solid color-mix(in srgb, var(--muted) 25%, transparent);
  padding: 1rem 0.5rem;
  overflow-y: auto;
}
.sb-section + .sb-section { margin-top: 1.25rem; }
.sb-heading {
  margin: 0 0 0.5rem 0.5rem;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}
.machines {
  list-style: none;
  margin: 0;
  padding: 0;
}
.machines .muted { padding: 0.25rem 0.5rem; color: var(--muted); font-size: 0.9rem; }
.small { font-size: 0.85rem; }
.machine + .machine { margin-top: 0.25rem; }

.machine-row {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 0.5rem;
  background: transparent;
  color: inherit;
  border: 0;
  border-radius: 0.375rem;
  text-align: left;
  cursor: pointer;
}
.machine-row:hover { background: color-mix(in srgb, var(--muted) 12%, transparent); }
.machine-row[data-selected] {
  background: color-mix(in srgb, var(--accent) 14%, transparent);
}
.machine-name { flex: 1; }
.machine-kind { color: var(--muted); font-size: 0.75rem; }
.dot {
  width: 0.5rem; height: 0.5rem; border-radius: 50%;
  background: var(--muted);
}
.dot-on  { background: #16a34a; }
.dot-off { background: var(--danger); }

.actions {
  padding: 0.25rem 0.5rem 0.25rem 1.5rem;
}
.leaf-action {
  width: 100%;
  text-align: left;
  background: transparent;
  color: var(--accent);
  border: 1px dashed color-mix(in srgb, var(--accent) 40%, transparent);
  padding: 0.35rem 0.5rem;
  border-radius: 0.375rem;
  font-size: 0.85rem;
}
.leaf-action:hover {
  background: color-mix(in srgb, var(--accent) 12%, transparent);
}

/* Phase 11 — admin shell visually distinct so the operator never
   confuses it with a plain user shell. Warmer hue + thicker border. */
.admin-shell-action {
  color: #d97706;
  border-style: solid;
  border-color: color-mix(in srgb, #d97706 50%, transparent);
}
.admin-shell-action:hover {
  background: color-mix(in srgb, #d97706 14%, transparent);
}

/* Phase 10 — tmux session list under each machine. */
.tmux-list-label {
  margin-top: 0.4rem;
  padding-left: 0.1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.7rem;
}
.tmux-list {
  list-style: none;
  margin: 0.1rem 0 0 0;
  padding: 0;
}
.tmux-row {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.1rem 0;
}
.tmux-attach {
  flex: 1;
  text-align: left;
  background: transparent;
  color: var(--fg);
  border: 1px solid color-mix(in srgb, var(--muted) 30%, transparent);
  border-radius: 0.3rem;
  padding: 0.2rem 0.4rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.78rem;
  cursor: pointer;
}
.tmux-attach:hover {
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  border-color: var(--accent);
  color: var(--accent);
}
.tmux-attached {
  color: var(--accent);
}

.main {
  grid-area: main;
  display: flex;
  flex-direction: column;
  min-width: 0;
}
.tab-strip {
  display: flex;
  gap: 1px;
  background: color-mix(in srgb, var(--muted) 20%, transparent);
  border-bottom: 1px solid color-mix(in srgb, var(--muted) 25%, transparent);
  min-height: 2.25rem;
  overflow-x: auto;
}
.tab {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.75rem;
  background: var(--bg);
  color: var(--muted);
  border: 0;
  border-radius: 0;
  font-size: 0.9rem;
  cursor: pointer;
  white-space: nowrap;
  user-select: none;
}
.tab[aria-selected="true"] {
  background: var(--card-bg);
  color: var(--fg);
  box-shadow: inset 0 -2px 0 var(--accent);
}
.tab-close {
  font-size: 1rem;
  line-height: 1;
  padding: 0 0.25rem;
  border-radius: 0.25rem;
  cursor: pointer;
  color: var(--muted);
}
.tab-close:hover { background: color-mix(in srgb, var(--muted) 20%, transparent); }

/* Phase 9 — writer-lease badge in the tab header. */
.tab-writer-badge {
  font-size: 0.85rem;
  line-height: 1;
  padding: 0 0.2rem;
  border-radius: 0.25rem;
  color: var(--muted);
  user-select: none;
}
.tab-writer-badge.clickable {
  cursor: pointer;
}
.tab-writer-badge.clickable:hover {
  background: color-mix(in srgb, var(--accent) 20%, transparent);
  color: var(--fg);
}

/* Phase 8b — file browser pane + transfer overlay. */
.ghost.small {
  background: transparent;
  color: inherit;
  border: 1px solid color-mix(in srgb, var(--muted) 35%, transparent);
  border-radius: 0.25rem;
  padding: 0.15rem 0.5rem;
  font-size: 0.78rem;
  cursor: pointer;
}
.ghost.small:hover {
  background: color-mix(in srgb, var(--muted) 12%, transparent);
}

.files-pane {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  font-size: 0.85rem;
  min-height: 0;
}
.files-header {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex-wrap: wrap;
}
.files-root-picker {
  background: var(--card-bg);
  color: var(--fg);
  border: 1px solid var(--border, #444);
  border-radius: 0.3rem;
  padding: 0.1rem 0.3rem;
}
.files-breadcrumb {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.78rem;
  color: var(--muted);
  word-break: break-all;
  line-height: 1.3;
}
.files-breadcrumb .crumb {
  color: var(--accent);
  text-decoration: none;
}
.files-breadcrumb .crumb:hover { text-decoration: underline; }
.files-breadcrumb .crumb-cur   { color: var(--fg); }
.files-actions {
  display: flex;
  gap: 0.3rem;
}
.files-warn {
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  border-left: 3px solid var(--accent);
  padding: 0.35rem 0.5rem;
  font-size: 0.78rem;
  border-radius: 0.2rem;
}
.files-list {
  list-style: none;
  margin: 0;
  padding: 0;
  overflow: auto;
  max-height: 60vh;
}
.files-row {
  display: grid;
  grid-template-columns: 1.2rem 1fr auto;
  align-items: center;
  gap: 0.4rem;
  padding: 0.15rem 0.3rem;
  border-radius: 0.2rem;
  cursor: pointer;
  user-select: none;
}
.files-row:hover { background: color-mix(in srgb, var(--accent) 15%, transparent); }
.files-row:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}
.files-row.muted { color: var(--muted); cursor: default; }
.files-row.muted:hover { background: transparent; }
.files-icon { text-align: center; }
.files-name {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.files-size {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.75rem;
  color: var(--muted);
}

/* Context menu (right-click). */
.files-menu {
  position: fixed;
  background: var(--card-bg);
  border: 1px solid var(--border, #444);
  border-radius: 0.3rem;
  box-shadow: 0 4px 18px rgba(0,0,0,0.4);
  z-index: 1000;
  padding: 0.25rem;
  min-width: 8rem;
  display: flex;
  flex-direction: column;
}
.files-menu-item {
  background: transparent;
  border: 0;
  text-align: left;
  padding: 0.3rem 0.6rem;
  color: var(--fg);
  cursor: pointer;
  border-radius: 0.2rem;
}
.files-menu-item:hover {
  background: color-mix(in srgb, var(--accent) 20%, transparent);
}

/* Transfer overlay (bottom-right). */
.transfer-overlay {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  width: min(22rem, 90vw);
  background: var(--card-bg);
  border: 1px solid var(--border, #444);
  border-radius: 0.4rem;
  box-shadow: 0 8px 24px rgba(0,0,0,0.45);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  max-height: 50vh;
}
.transfer-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.4rem 0.6rem;
  font-weight: 600;
  border-bottom: 1px solid var(--border, #444);
}
.transfer-close {
  background: transparent; border: 0; color: var(--muted);
  font-size: 1rem; cursor: pointer; padding: 0 0.3rem;
}
.transfer-close:hover { color: var(--fg); }
.transfer-list {
  list-style: none;
  margin: 0;
  padding: 0.3rem 0;
  overflow: auto;
}
.transfer-row {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 0.5rem;
  align-items: center;
  padding: 0.25rem 0.6rem;
  font-size: 0.85rem;
}
.transfer-row.success  .transfer-status { color: #6c6; }
.transfer-row.failed   .transfer-status { color: #c66; }
.transfer-row.cancelled .transfer-status { color: var(--muted); }
.transfer-name {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
.transfer-status {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color: var(--muted);
  font-size: 0.8rem;
}
.transfer-cancel {
  background: transparent;
  border: 1px solid var(--border, #444);
  color: var(--muted);
  border-radius: 0.2rem;
  padding: 0.05rem 0.4rem;
  font-size: 0.75rem;
  cursor: pointer;
}
.transfer-cancel:hover { color: var(--fg); border-color: var(--fg); }

/* Drop target hint when dragging a File over the terminal area. */
.tab-bodies.drop-target::after {
  content: "Drop files to upload to the active shell's cwd";
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: var(--fg);
  background: color-mix(in srgb, var(--accent) 25%, transparent);
  border: 2px dashed var(--accent);
  pointer-events: none;
  z-index: 5;
}

.tab-bodies {
  flex: 1;
  position: relative;
  overflow: hidden;
  min-height: 0;
}
.tab-body {
  padding: 0;
  position: absolute;
  inset: 0;
}
.tab-body[hidden] { display: none; }
.xterm-host {
  width: 100%;
  height: 100%;
  background: #000;
}
.xterm-host .xterm {
  width: 100%;
  height: 100%;
  padding: 0.5rem;
  box-sizing: border-box;
}
.placeholder { color: var(--muted); padding: 1.5rem; }
.placeholder h2 { margin: 0 0 0.5rem; color: var(--fg); }

.empty-state {
  display: grid;
  place-items: center;
  height: 100%;
  color: var(--muted);
  text-align: center;
  padding: 2rem;
}

.sidebar-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  z-index: 5;
}

/* Narrow widths: sidebar becomes off-canvas drawer. */
@media (max-width: 720px) {
  .app {
    grid-template-columns: 1fr;
    grid-template-areas:
      "bar"
      "main";
  }
  .app-bar .hamburger { display: inline-flex; }
  .sidebar {
    position: fixed;
    top: 3rem;
    left: 0;
    bottom: 0;
    width: min(18rem, 80vw);
    z-index: 10;
    transform: translateX(-100%);
    transition: transform 0.15s ease-out;
    border-right: 1px solid color-mix(in srgb, var(--muted) 30%, transparent);
  }
  body.sb-open .sidebar { transform: translateX(0); }
  body:not(.sb-open) .sidebar-backdrop { display: none; }
}
@media (min-width: 721px) {
  .sidebar-backdrop { display: none; }
}