:root {
  --bg: #f8fafc;
  --fg: #0f172a;
  --muted: #64748b;
  --border: #e2e8f0;
  --accent: #2563eb;
  --accent-fg: #ffffff;
  --danger: #dc2626;
  --warn: #b45309;
  --ok: #047857;
  --bar-bg: #ffffff;
  --shadow: 0 1px 2px rgb(0 0 0 / 6%);
  --shadow-lg: 0 10px 30px rgb(0 0 0 / 15%);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1220;
    --fg: #e2e8f0;
    --muted: #94a3b8;
    --border: #1e293b;
    --accent: #3b82f6;
    --warn: #f59e0b;
    --ok: #10b981;
    --bar-bg: #0f172a;
    --shadow: 0 1px 2px rgb(0 0 0 / 50%);
    --shadow-lg: 0 20px 40px rgb(0 0 0 / 50%);
  }
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  -webkit-text-size-adjust: 100%;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
}

/* ---------- top bar ---------- */
.bar {
  display: grid;
  grid-template-columns: auto 1fr auto auto;
  grid-template-areas:
    "brand picker logout menu"
    "status status status status";
  gap: 8px 10px;
  align-items: center;
  padding: 10px 12px 8px;
  padding-top: max(10px, env(safe-area-inset-top));
  background: var(--bar-bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 5;
  box-shadow: var(--shadow);
}

.brand {
  grid-area: brand;
  font-weight: 600;
  text-decoration: none;
  color: var(--fg);
  font-size: 0.95rem;
  padding: 4px 2px;
  border-radius: 6px;
}
.brand:hover { color: var(--accent); }
.brand:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.bar-btn {
  grid-area: logout;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--fg);
  height: 38px;
  padding: 0 12px;
  border-radius: 8px;
  font: 600 0.85rem/1 system-ui, sans-serif;
  cursor: pointer;
}
.bar-btn:hover { background: var(--border); }
.bar-btn:active { transform: scale(0.97); }

.picker {
  grid-area: picker;
  width: 100%;
  min-width: 0;
  padding: 9px 10px;
  font: inherit;
  font-size: 0.95rem;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--fg);
  border-radius: 8px;
  appearance: none;
  -webkit-appearance: none;
  background-image: linear-gradient(45deg, transparent 50%, var(--muted) 50%),
                    linear-gradient(135deg, var(--muted) 50%, transparent 50%);
  background-position: calc(100% - 16px) center, calc(100% - 11px) center;
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
  padding-right: 28px;
}

.menu-btn {
  grid-area: menu;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--fg);
  width: 38px;
  height: 38px;
  border-radius: 8px;
  font-size: 1.3rem;
  cursor: pointer;
  padding: 0;
  line-height: 1;
}
.menu-btn:hover { background: var(--border); }
.menu-btn:active { transform: scale(0.97); }

.menu {
  position: absolute;
  top: 56px;
  right: 12px;
  background: var(--bar-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  min-width: 160px;
  z-index: 10;
  overflow: hidden;
}
.menu button {
  border: 0;
  background: transparent;
  color: var(--fg);
  text-align: left;
  padding: 12px 16px;
  font: inherit;
  cursor: pointer;
}
.menu button:hover { background: var(--border); }
.menu button.danger { color: var(--danger); }

.status {
  grid-area: status;
  font-size: 0.8rem;
  color: var(--muted);
  text-align: right;
  padding: 0 4px;
  min-height: 1.1em;
}
.status.dirty  { color: var(--warn); }
.status.saving { color: var(--accent); }
.status.error  { color: var(--danger); }
.status.saved  { color: var(--ok); }

/* ---------- main ---------- */
main {
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

/* ---------- welcome ---------- */
.welcome {
  flex: 1 1 auto;
  padding: 20px 16px 24px;
  max-width: 680px;
  width: 100%;
  margin: 0 auto;
}
.welcome h1 {
  margin: 8px 0 16px;
  font-size: 1.35rem;
  font-weight: 600;
}
.welcome-list {
  list-style: none;
  padding: 0;
  margin: 0 0 20px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--bar-bg);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.welcome-list li {
  border-top: 1px solid var(--border);
}
.welcome-list li:first-child { border-top: 0; }
.welcome-list button {
  width: 100%;
  text-align: left;
  background: transparent;
  border: 0;
  color: var(--fg);
  padding: 14px 16px;
  font: inherit;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 3px;
}
.welcome-list button:hover { background: var(--border); }
.welcome-list .title { font-weight: 500; }
.welcome-list .meta  { font-size: 0.8rem; color: var(--muted); }
.welcome-list .empty {
  padding: 24px 16px;
  text-align: center;
  color: var(--muted);
  font-size: 0.95rem;
}

button.primary {
  background: var(--accent);
  color: var(--accent-fg);
  border: 0;
  padding: 13px 18px;
  font: inherit;
  font-weight: 500;
  border-radius: 10px;
  cursor: pointer;
  width: 100%;
  box-shadow: var(--shadow);
}
button.primary:hover { filter: brightness(1.06); }
button.primary:active { transform: scale(0.99); }

/* ---------- editor ---------- */
.editor {
  flex: 1 1 auto;
  display: flex;
  min-height: 0;
  position: relative;
}
.editor textarea {
  flex: 1 1 auto;
  width: 100%;
  min-width: 0;
  border: 0;
  padding: 18px 16px max(18px, env(safe-area-inset-bottom));
  font: 16px/1.6 ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  background: var(--bg);
  color: var(--fg);
  resize: none;
  outline: none;
  -webkit-tap-highlight-color: transparent;
}

/* ---------- markdown preview ---------- */
.preview {
  flex: 1 1 100%;
  min-width: 0;
  overflow: auto;
  padding: 18px 16px max(18px, env(safe-area-inset-bottom));
  background: var(--bg);
  color: var(--fg);
  border-left: 1px solid var(--border);
  outline: none;
}
.preview:focus-visible { box-shadow: inset 0 0 0 2px var(--accent); }
.preview-body { max-width: 72ch; word-wrap: break-word; }
.preview-body > :first-child { margin-top: 0; }
.preview-body h1,
.preview-body h2,
.preview-body h3,
.preview-body h4 { margin: 1.2em 0 0.5em; line-height: 1.3; font-weight: 600; }
.preview-body h1 { font-size: 1.5rem; }
.preview-body h2 { font-size: 1.25rem; }
.preview-body h3 { font-size: 1.05rem; }
.preview-body h4 { font-size: 0.95rem; color: var(--muted); }
.preview-body p,
.preview-body ul,
.preview-body ol,
.preview-body blockquote,
.preview-body pre,
.preview-body table { margin: 0.6em 0; }
.preview-body ul,
.preview-body ol { padding-left: 1.5em; }
.preview-body li + li { margin-top: 0.2em; }
.preview-body code {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.92em;
  background: color-mix(in srgb, var(--border) 60%, transparent);
  padding: 1px 5px;
  border-radius: 4px;
}
.preview-body pre {
  background: color-mix(in srgb, var(--border) 60%, transparent);
  padding: 12px 14px;
  border-radius: 8px;
  overflow-x: auto;
  font-size: 0.92em;
  line-height: 1.5;
}
.preview-body pre code { background: transparent; padding: 0; font-size: inherit; }
.preview-body blockquote {
  border-left: 3px solid var(--border);
  padding-left: 12px;
  color: var(--muted);
}
.preview-body a { color: var(--accent); word-break: break-word; }
.preview-body hr { border: 0; border-top: 1px solid var(--border); margin: 1.5em 0; }
.preview-body table { border-collapse: collapse; width: 100%; }
.preview-body th,
.preview-body td { border: 1px solid var(--border); padding: 6px 10px; text-align: left; }
.preview-body th { background: color-mix(in srgb, var(--border) 40%, transparent); font-weight: 600; }
.preview-body .preview-empty { color: var(--muted); font-style: italic; }
.preview-body .preview-image-stub {
  display: inline-block;
  padding: 2px 8px;
  border: 1px dashed var(--border);
  border-radius: 6px;
  color: var(--muted);
  font-size: 0.85em;
  font-style: italic;
}

.preview-toggle {
  position: absolute;
  top: 10px;
  right: 12px;
  z-index: 2;
  border: 1px solid var(--border);
  background: var(--bar-bg);
  color: var(--fg);
  padding: 6px 14px;
  border-radius: 999px;
  font: 600 0.82rem/1 system-ui, sans-serif;
  cursor: pointer;
  box-shadow: var(--shadow);
}
.preview-toggle:hover { background: var(--border); }
.preview-toggle:active { transform: scale(0.97); }
.preview-toggle[aria-pressed="true"] {
  background: var(--accent);
  color: var(--accent-fg);
  border-color: transparent;
}

/* ---------- dialogs ---------- */
dialog {
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--bar-bg);
  color: var(--fg);
  padding: 0;
  max-width: min(420px, 92vw);
  width: 100%;
  box-shadow: 0 20px 60px rgb(0 0 0 / 35%);
}
dialog::backdrop { background: rgb(0 0 0 / 45%); }
dialog form {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
dialog h2 { margin: 0; font-size: 1.1rem; font-weight: 600; }
dialog p { margin: 0; color: var(--muted); font-size: 0.95rem; }
dialog label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--muted);
}
dialog input {
  font: inherit;
  font-size: 1rem;
  padding: 11px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--fg);
}
dialog input:focus { outline: 2px solid var(--accent); outline-offset: -1px; }

dialog menu {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
  margin: 0;
  padding: 0;
  list-style: none;
}
dialog menu button {
  font: inherit;
  padding: 10px 16px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--fg);
  cursor: pointer;
}
dialog menu button:hover { background: var(--border); }
dialog menu button.primary {
  border-color: transparent;
  width: auto;
  box-shadow: none;
}
dialog menu button.danger {
  border-color: transparent;
  background: var(--danger);
  color: #ffffff;
}

/* ---------- auth (login + create) ---------- */
.auth {
  flex: 1 1 auto;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 24px 16px max(24px, env(safe-area-inset-bottom));
}
.auth-inner {
  width: 100%;
  max-width: 440px;
}
.auth-brand {
  text-align: center;
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--muted);
  margin: 16px 0 28px;
  letter-spacing: 0.02em;
}
.auth-form {
  display: flex;
  flex-direction: column;
  gap: 14px;
  background: var(--bar-bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 22px 22px 24px;
  box-shadow: var(--shadow);
}
.auth-form h2 { margin: 0; font-size: 1.15rem; font-weight: 600; }
.auth-form h3 { margin: 8px 0 0; font-size: 0.95rem; font-weight: 600; }
.auth-form label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--muted);
}
.auth-form input {
  font: inherit;
  font-size: 1rem;
  padding: 11px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--fg);
}

/* Off-screen but rendered: lets password managers see the username field
   on password-only forms (login step 2, add-AP) without showing it to the
   user. display:none would make most password managers skip it. */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}
.auth-form input:focus { outline: 2px solid var(--accent); outline-offset: -1px; }

.auth-sub {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.45;
}
.auth-error {
  margin: 0;
  padding: 10px 12px;
  background: color-mix(in srgb, var(--danger) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--danger) 35%, transparent);
  color: var(--danger);
  border-radius: 8px;
  font-size: 0.88rem;
}
.auth-foot {
  text-align: center;
  margin-top: 16px;
}

/* Inline checkbox row inside .auth-form (label content needs to lay out
   horizontally, overriding the column flex on .auth-form label). */
.auth-form label.auth-check {
  flex-direction: row;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--fg);
}
.auth-form label.auth-check input { width: auto; padding: 0; }

button.ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--fg);
  padding: 11px 16px;
  font: inherit;
  border-radius: 8px;
  cursor: pointer;
}
button.ghost:hover { background: var(--border); }

button.link {
  background: transparent;
  border: 0;
  color: var(--accent);
  font: inherit;
  padding: 6px 4px;
  cursor: pointer;
}
button.link:hover { text-decoration: underline; }

/* notebook name as a phrase */
.phrase {
  font: 600 1.05rem/1.4 ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  text-align: center;
  padding: 14px 12px;
  background: var(--bg);
  border: 1px dashed var(--border);
  border-radius: 8px;
  word-break: break-all;
  user-select: all;
}
.phrase-row {
  display: flex;
  align-items: stretch;
  gap: 8px;
}
.phrase-row > .phrase,
.phrase-row > .secret-text { flex: 1; min-width: 0; }
.copy-btn {
  flex: 0 0 auto;
  font: 600 0.85rem/1 system-ui, sans-serif;
  padding: 0 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--fg);
  cursor: pointer;
}
.copy-btn:hover:not(:disabled) { border-color: var(--accent); }
.copy-btn:disabled { opacity: 0.5; cursor: not-allowed; }
.copy-btn.copied { color: var(--ok); border-color: var(--ok); }

/* QR canvas wrapper. Force white bg so it scans in dark mode. */
.qr {
  display: flex;
  justify-content: center;
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
}
.qr svg { display: block; max-width: 220px; height: auto; }

.secret-text {
  display: block;
  text-align: center;
  font: 0.85rem/1.4 ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px;
  word-break: break-all;
  letter-spacing: 0.05em;
  color: var(--fg);
  user-select: all;
}

/* ---------- settings dialog / AP list ---------- */
.ap-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
  max-height: 220px;
  overflow: auto;
}
.ap-list li {
  border-top: 1px solid var(--border);
  padding: 10px 12px;
  font-size: 0.9rem;
}
.ap-list li:first-child { border-top: 0; }
.ap-list li.empty {
  color: var(--muted);
  text-align: center;
  padding: 16px;
  font-style: italic;
}
.ap-main {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

/* Items in the trusted-devices list have a Revoke button next to the
   metadata; arrange horizontally. */
#device-list li {
  display: flex;
  align-items: center;
  gap: 12px;
}
#device-list li.empty { display: block; }
#device-list li .ap-main { flex: 1; }
#device-list li button.ghost { padding: 6px 12px; font-size: 0.85rem; }
.ap-label { font-weight: 500; }
.ap-meta { font-size: 0.78rem; color: var(--muted); }
.ap-self {
  display: inline-block;
  margin-left: 6px;
  padding: 1px 6px;
  background: var(--accent);
  color: var(--accent-fg);
  border-radius: 999px;
  font-size: 0.7rem;
  vertical-align: middle;
}

/* settings + add-ap dialogs are wider than the existing title/confirm */
#settings-dialog, #add-ap-dialog { max-width: min(480px, 94vw); }
#add-ap-dialog form { gap: 12px; }
#add-ap-dialog .qr svg { max-width: 180px; }
#add-ap-dialog menu { flex-wrap: wrap; }

/* ---------- desktop tweak ---------- */
@media (min-width: 720px) {
  .bar {
    grid-template-columns: auto minmax(220px, 360px) auto auto auto;
    grid-template-areas: "brand picker logout menu status";
    padding: 12px 18px;
  }
  .status { padding: 0; min-width: 12em; }
  .editor { flex-direction: row; }
  .editor textarea { padding: 24px 28px; }
  .preview { padding: 24px 28px; flex-basis: 50%; }
  .preview-toggle { top: 14px; right: 18px; }
  .welcome { padding: 32px 24px; }
  .auth { padding: 48px 24px; }
}

/* ---------- backup section (in settings dialog) ---------- */
#backup-config-details,
#backup-list-details {
  margin: 0.75rem 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.5rem 0.75rem;
  background: color-mix(in srgb, var(--bg) 90%, transparent);
}
#backup-config-details > summary,
#backup-list-details > summary {
  cursor: pointer;
  font-weight: 600;
  padding: 0.25rem 0;
  color: var(--fg);
}
#backup-config-details[open],
#backup-list-details[open] {
  padding-bottom: 0.75rem;
}
#backup-config-details label {
  margin-top: 0.5rem;
  display: block;
}
#backup-config-details h4 {
  margin: 1rem 0 0.5rem;
  font-size: 0.95rem;
  color: var(--muted);
}
#backup-config-details em {
  font-style: normal;
  font-size: 0.85em;
  color: var(--muted);
}

.backup-warning {
  margin: 0.75rem 0;
  padding: 0.6rem 0.8rem;
  border-radius: 8px;
  background: color-mix(in srgb, var(--warn) 12%, var(--bg));
  border-left: 3px solid var(--warn);
  color: var(--fg);
  font-size: 0.92em;
  line-height: 1.45;
}

.backup-banner {
  margin: 0.5rem 0;
  padding: 0.6rem 0.8rem;
  border-radius: 8px;
  background: color-mix(in srgb, var(--danger) 14%, var(--bg));
  border-left: 3px solid var(--danger);
  color: var(--fg);
  font-size: 0.92em;
  line-height: 1.45;
}
.backup-banner code {
  display: inline-block;
  margin-top: 0.25rem;
  font-size: 0.85em;
  word-break: break-all;
}

.backup-config-actions,
.backup-actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: 0.75rem;
  padding: 0;
}
.backup-config-actions button,
.backup-actions button {
  padding: 8px 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--fg);
  font: inherit;
  cursor: pointer;
}
.backup-config-actions button.primary,
.backup-actions button.primary {
  background: var(--accent);
  color: var(--accent-fg);
  border-color: var(--accent);
}
.backup-config-actions button.danger {
  color: var(--danger);
  border-color: color-mix(in srgb, var(--danger) 60%, var(--border));
}
.backup-config-actions button:disabled,
.backup-actions button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

#backup-status .ap-meta { color: var(--muted); }
#backup-list li a.ghost,
#backup-list li button.ghost {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 10px;
  margin-left: 6px;
  color: var(--fg);
  text-decoration: none;
  font-size: 0.88em;
  cursor: pointer;
}
#backup-list li a.ghost:hover,
#backup-list li button.ghost:hover {
  background: var(--border);
}