:root {
  color-scheme: light dark;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --bg: #f5f7fb;
  --surface: #ffffff;
  --surface-muted: #f8fafc;
  --text: #172033;
  --muted: #667085;
  --border: #d9e0ea;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --danger: #b42318;
  --success: #087443;
  --focus: #93c5fd;
  --shadow: 0 12px 30px rgb(15 23 42 / 0.08);
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--bg);
}

body {
  min-height: 100vh;
  max-width: none;
  margin: 0;
  padding: 0;
  color: var(--text);
  background:
    radial-gradient(circle at top right, rgb(37 99 235 / 0.08), transparent 28rem),
    var(--bg);
  line-height: 1.55;
}

body > main,
main {
  width: min(1180px, calc(100% - 32px));
  margin: 32px auto;
  padding: 28px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--shadow);
}

h1,
h2,
h3 {
  color: var(--text);
  line-height: 1.2;
}

h1 {
  margin-top: 0;
  margin-bottom: 20px;
  font-size: clamp(1.8rem, 4vw, 2.5rem);
}

h2 {
  margin-top: 32px;
  font-size: 1.35rem;
}

p {
  margin: 0 0 16px;
}

a {
  color: var(--accent);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--accent-hover);
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

nav a,
a.button {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface-muted);
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
}

nav a:hover,
a.button:hover {
  border-color: #aab6c8;
  background: #eef3f9;
  color: var(--text);
}

form {
  margin: 0 0 18px;
}

label {
  display: block;
  margin-bottom: 12px;
  color: var(--text);
  font-weight: 600;
}

input,
select,
textarea,
button {
  font: inherit;
}

input,
select,
textarea {
  width: 100%;
  max-width: 100%;
  margin-top: 6px;
  padding: 10px 12px;
  border: 1px solid #b8c2d0;
  border-radius: 10px;
  background: var(--surface);
  color: var(--text);
}

input:focus,
select:focus,
textarea:focus,
button:focus-visible,
a:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

button,
a.button {
  cursor: pointer;
}

button {
  min-height: 40px;
  padding: 9px 14px;
  border: 1px solid var(--accent);
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
}

button:hover {
  border-color: var(--accent-hover);
  background: var(--accent-hover);
}

.actions,
.create {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.actions form,
.create form {
  margin: 0;
}

.notice,
.error {
  padding: 12px 14px;
  border-radius: 10px;
  background: var(--surface-muted);
}

.notice {
  border: 1px solid #8bd3ad;
  color: var(--success);
}

.error {
  border: 1px solid #f0a39c;
  color: var(--danger);
}

.card,
section.card {
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface-muted);
}

table {
  width: 100%;
  margin: 18px 0 28px;
  border-collapse: collapse;
  border-spacing: 0;
}

thead {
  background: var(--surface-muted);
}

th,
td {
  padding: 12px 10px;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

th {
  color: #344054;
  font-size: 0.9rem;
  font-weight: 700;
}

tbody tr:hover {
  background: rgb(37 99 235 / 0.035);
}

code {
  padding: 0.1em 0.35em;
  border-radius: 6px;
  background: #eef2f7;
  color: #24324a;
}

small,
.muted {
  color: var(--muted);
}

body > main > p > a:not(.button) {
  font-weight: 600;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1120;
    --surface: #111827;
    --surface-muted: #172033;
    --text: #e5e7eb;
    --muted: #aab4c4;
    --border: #334155;
    --accent: #60a5fa;
    --accent-hover: #93c5fd;
    --focus: #2563eb;
    --shadow: 0 12px 30px rgb(0 0 0 / 0.24);
  }

  nav a,
  a.button {
    background: #182235;
    color: var(--text);
  }

  nav a:hover,
  a.button:hover {
    background: #22304a;
    color: var(--text);
  }

  input,
  select,
  textarea {
    border-color: #475569;
    background: #0f172a;
  }

  button {
    color: #08111f;
  }

  thead {
    background: #182235;
  }

  th {
    color: #cbd5e1;
  }

  code {
    background: #182235;
    color: #dbeafe;
  }
}

@media (max-width: 760px) {
  body > main,
  main {
    width: min(100% - 20px, 1180px);
    margin: 10px auto;
    padding: 18px;
    border-radius: 14px;
  }

  table,
  thead,
  tbody,
  tr,
  th,
  td {
    display: block;
  }

  thead {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip-path: inset(50%);
  }

  tr {
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
  }

  td {
    padding: 6px 0;
    border: 0;
  }

  .actions,
  .create {
    align-items: stretch;
    flex-direction: column;
  }

  .actions form,
  .actions button,
  .actions a.button,
  .create input,
  .create button {
    width: 100%;
  }
}


.table-scroll {
  overflow-x: auto;
}

form.share,
form.create,
form.identity {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr)) auto;
  gap: 10px;
  align-items: end;
}

form.share {
  grid-template-columns: 2fr 1fr auto;
}

form.create {
  margin-bottom: 28px;
}

form.identity {
  margin: 16px 0;
}

.phone {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 8px;
  margin-bottom: 8px;
}

fieldset {
  margin: 0 0 18px;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 12px;
}

legend {
  padding: 0 6px;
  font-weight: 700;
}

.device,
.secret {
  margin: 18px 0;
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface-muted);
}

.secret pre {
  overflow: auto;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
}

dl {
  display: grid;
  grid-template-columns: minmax(140px, 180px) 1fr;
  gap: 8px 14px;
}

dt {
  font-weight: 700;
}

dd {
  margin: 0;
}

.books {
  margin-top: 16px;
}

.book {
  display: flex;
  gap: 8px;
  align-items: center;
  margin: 8px 0;
  font-weight: 500;
}

.book input[type="checkbox"] {
  width: auto;
  margin: 0;
}

.login-shell {
  max-width: 460px;
  margin-top: 10vh;
}

@media (max-width: 760px) {
  form.share,
  form.create,
  form.identity,
  .phone,
  dl {
    grid-template-columns: 1fr;
  }

  .login-shell {
    margin-top: 10px;
  }
}


.dashboard-shell {
  max-width: 980px;
}

.dashboard-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 28px;
}

.dashboard-header h1 {
  margin-bottom: 10px;
}

.dashboard-header p {
  margin-bottom: 0;
  color: var(--muted);
}

.dashboard-logout {
  flex: 0 0 auto;
  margin: 0;
}

.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 0;
  padding: 0;
  border: 0;
}

.dashboard-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 86px;
  padding: 18px 20px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface-muted);
  color: var(--text);
  text-decoration: none;
  font-size: 1.05rem;
  font-weight: 700;
}

.dashboard-card:hover {
  border-color: #aab6c8;
  background: #eef3f9;
  color: var(--text);
  transform: translateY(-1px);
}

@media (prefers-color-scheme: dark) {
  .dashboard-card:hover {
    background: #22304a;
  }
}

@media (max-width: 760px) {
  .dashboard-header {
    flex-direction: column;
  }

  .dashboard-logout,
  .dashboard-logout button {
    width: 100%;
  }

  .dashboard-grid {
    grid-template-columns: 1fr;
  }
}


.app-header {
  border-bottom: 1px solid var(--border);
  background: rgb(17 24 39 / 0.88);
  backdrop-filter: blur(12px);
}

.app-header-inner,
.app-footer-inner {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
}

.app-header-inner {
  display: flex;
  align-items: center;
  min-height: 58px;
}

.app-brand {
  color: var(--text);
  text-decoration: none;
  font-weight: 800;
  letter-spacing: 0.01em;
}

.app-brand:hover {
  color: var(--accent);
}

.app-footer {
  margin-top: 28px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
}

.app-footer-inner {
  display: flex;
  gap: 8px;
  justify-content: center;
  padding: 20px 0 28px;
}

.actions button {
  border-color: var(--border);
  background: var(--surface);
  color: var(--text);
}

.actions button:hover {
  border-color: #aab6c8;
  background: var(--surface-muted);
  color: var(--text);
}

.device .actions {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  align-items: stretch;
  gap: 10px;
}

.device .actions form,
.device .actions button {
  width: 100%;
  min-width: 0;
}

.device .actions button {
  min-height: 44px;
  white-space: normal;
  line-height: 1.25;
}

@media (prefers-color-scheme: dark) {
  .app-header {
    background: rgb(11 17 32 / 0.9);
  }

  .actions button {
    border-color: var(--border);
    background: #182235;
    color: var(--text);
  }

  .actions button:hover {
    background: #22304a;
    color: var(--text);
  }
}

@media (max-width: 760px) {
  .app-header-inner,
  .app-footer-inner {
    width: min(100% - 20px, 1180px);
  }

  .app-footer-inner {
    flex-wrap: wrap;
  }

  .device .actions {
    grid-template-columns: 1fr;
  }
}