:root {
  color-scheme: light;
  --bg: #f5f7fa;
  --panel: #ffffff;
  --text: #121826;
  --muted: #667085;
  --line: #d9e0e8;
  --blue: #2563eb;
  --blue-dark: #1d4ed8;
  --green: #11855a;
  --red: #d92d20;
  --amber: #b54708;
  --shadow: 0 12px 30px rgba(20, 30, 55, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: Arial, "Microsoft YaHei", sans-serif;
  letter-spacing: 0;
}

button,
input {
  font: inherit;
}

button {
  min-height: 40px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  color: var(--text);
  padding: 0 14px;
  cursor: pointer;
}

button:hover {
  border-color: #9aa8ba;
}

button.primary {
  border-color: var(--blue);
  background: var(--blue);
  color: #fff;
}

button.primary:hover {
  background: var(--blue-dark);
}

.button-link {
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  color: var(--text);
  padding: 0 14px;
  text-decoration: none;
}

.button-link:hover {
  border-color: #9aa8ba;
}

button.danger {
  border-color: #f6c1bd;
  color: var(--red);
  background: #fff8f7;
}

input {
  width: 100%;
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 12px;
  background: #fff;
  color: var(--text);
}

.hidden {
  display: none !important;
}

.login-view {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.login-panel {
  width: min(420px, 100%);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
  padding: 28px;
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--blue);
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 22px;
  font-size: 28px;
}

h2 {
  font-size: 20px;
}

.stack {
  display: grid;
  gap: 14px;
}

label {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-size: 14px;
}

.form-error {
  min-height: 20px;
  color: var(--red);
}

.dashboard {
  width: min(1180px, 100%);
  margin: 0 auto;
  padding: 18px;
}

.topbar,
.toolbar,
.register-form,
.tabs {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.topbar {
  justify-content: space-between;
  margin-bottom: 14px;
}

.topbar h1 {
  margin-bottom: 0;
}

.top-actions {
  display: flex;
  gap: 8px;
}

.icon-btn {
  width: 42px;
  padding: 0;
  font-size: 22px;
}

.text-btn {
  background: transparent;
}

.tabs {
  border-bottom: 1px solid var(--line);
  margin-bottom: 14px;
}

.tab {
  border: 0;
  border-bottom: 3px solid transparent;
  border-radius: 0;
  background: transparent;
}

.tab.active {
  border-bottom-color: var(--blue);
  color: var(--blue);
  font-weight: 700;
}

.toolbar,
.register-form,
.token-box {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
  margin-bottom: 12px;
}

.register-form {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
}

.token-box {
  color: var(--amber);
  overflow-wrap: anywhere;
}

.device-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 12px;
}

.device-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  box-shadow: 0 6px 16px rgba(20, 30, 55, 0.04);
}

.device-card header {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.device-title {
  min-width: 0;
}

.device-title h2 {
  margin-bottom: 4px;
  overflow-wrap: anywhere;
}

.device-id {
  color: var(--muted);
  font-size: 13px;
}

.status {
  align-self: start;
  border-radius: 999px;
  padding: 4px 9px;
  font-size: 13px;
  font-weight: 700;
  color: #344054;
  background: #eef2f6;
}

.status.online {
  color: var(--green);
  background: #e9f8f2;
}

.meta {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 12px;
}

.meta span {
  color: var(--text);
}

.card-actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.notes-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px;
  margin: 12px 0;
}

.delete-btn {
  margin-top: 8px;
  width: 100%;
}

.log-list {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
}

.log-row {
  display: grid;
  grid-template-columns: 160px 130px 1fr;
  gap: 12px;
  padding: 12px;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
}

.log-row:last-child {
  border-bottom: 0;
}

.log-action {
  font-weight: 700;
}

.log-detail {
  color: var(--muted);
  overflow-wrap: anywhere;
}

.action-notice {
  margin: 10px 0;
  border: 1px solid #9ad9c2;
  border-radius: 6px;
  padding: 10px 12px;
  color: #087451;
  background: #edfbf5;
}

.action-notice.error {
  border-color: #f3a7a7;
  color: #c62828;
  background: #fff5f5;
}

dialog {
  width: min(420px, calc(100% - 28px));
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.dialog-body {
  display: grid;
  gap: 12px;
}

.dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

.confirm-error {
  min-height: 20px;
  margin: 0;
}

@media (max-width: 720px) {
  .dashboard {
    padding: 12px;
  }

  .register-form {
    grid-template-columns: 1fr;
  }

  .toolbar button {
    flex: 1 1 calc(50% - 8px);
  }

  .log-row {
    grid-template-columns: 1fr;
    gap: 4px;
  }
}