:root {
  --color-brand: #c86b36;
  --color-brand-hover: #b55b2b;
  --color-brand-soft: rgba(200, 107, 54, 0.12);
  --color-accent-cool: rgba(96, 138, 176, 0.18);
  --color-bg-page: #f6f3ef;
  --color-bg-panel: rgba(255, 255, 255, 0.82);
  --color-bg-panel-solid: #ffffff;
  --color-text-primary: #2d2a26;
  --color-text-secondary: #6a645d;
  --color-text-muted: #7a7168;
  --color-border: rgba(199, 181, 163, 0.46);
  --color-border-weak: rgba(199, 181, 163, 0.26);
  --color-border-strong: rgba(199, 181, 163, 0.72);
  --color-border-focus: rgba(200, 107, 54, 0.6);
  --color-success: #2f7d68;
  --color-warning: #c58a1f;
  --color-danger: #b5523c;
  --shadow-card: 0 8px 24px rgba(53, 41, 27, 0.08);
  --shadow-elevated: 0 16px 40px rgba(53, 41, 27, 0.12);
  --focus-ring: 0 0 0 3px rgba(200, 107, 54, 0.2);
}

html {
  font-size: 13px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Noto Sans SC", sans-serif;
  color: var(--color-text-primary);
  overflow-x: hidden;
  background:
    radial-gradient(circle at 8% 2%, rgba(200, 107, 54, 0.14), transparent 26%),
    radial-gradient(circle at 100% -10%, var(--color-accent-cool), transparent 32%),
    linear-gradient(180deg, #f9f5ef 0%, var(--color-bg-page) 100%);
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
select {
  font: inherit;
}

input,
select {
  width: 100%;
  padding: 0.5rem 0.65rem;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.88);
  color: var(--color-text-primary);
  font-size: 0.92rem;
}

input:hover,
select:hover {
  border-color: var(--color-border-strong);
}

input:focus,
select:focus {
  outline: none;
  border-color: var(--color-border-focus);
  box-shadow: var(--focus-ring);
}

button {
  border: 0;
  border-radius: 10px;
  padding: 0.5rem 0.8rem;
  background: linear-gradient(135deg, var(--color-brand), #9a5b34);
  color: #fff;
  cursor: pointer;
  font-size: 0.92rem;
  transition: opacity 150ms, box-shadow 150ms;
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

button:not(:disabled):hover {
  box-shadow: 0 2px 8px rgba(200, 107, 54, 0.25);
}

button.ghost:not(:disabled):hover {
  box-shadow: none;
  background: rgba(245, 240, 234, 0.96);
}

button.ghost {
  background: rgba(255, 255, 255, 0.88);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
}

button.danger-ghost {
  color: var(--color-danger);
  border-color: rgba(171, 48, 48, 0.28);
  background: rgba(255, 245, 245, 0.96);
}

button.danger-ghost:not(:disabled):hover {
  background: rgba(255, 235, 235, 0.98);
}

#login-submit-btn.locked {
  background: #6b1010;
  color: #fff5f5;
  cursor: not-allowed;
}

.shell {
  min-height: 100vh;
  max-width: 100vw;
  overflow-x: hidden;
}

.card {
  background: rgba(255, 255, 255, 0.88);
  border: 1px solid var(--color-border);
  border-radius: 14px;
  padding: 0.9rem;
  box-shadow: var(--shadow-card);
}

.login-card {
  max-width: 380px;
  margin: 4rem auto 0;
}

.form {
  display: grid;
  gap: 1rem;
}

.verify-panel {
  display: grid;
  gap: 0.5rem;
  padding: 0.7rem;
  border-radius: 12px;
  background: rgba(200, 107, 54, 0.08);
  border: 1px solid rgba(200, 107, 54, 0.18);
}

.verify-row {
  display: grid;
  gap: 0.65rem;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
}

label span {
  display: block;
  font-size: 0.88rem;
  margin-bottom: 0.25rem;
}

.dashboard-shell {
  display: grid;
  grid-template-columns: 156px minmax(0, 1fr);
  min-height: 100vh;
  max-width: 100vw;
  overflow: hidden;
}

.dashboard-main {
  min-width: 0;
  max-width: 100%;
  overflow-x: hidden;
  transition: grid-template-columns 180ms ease;
}

.side-nav {
  padding: 16px 10px;
  border-right: 1px solid var(--color-border);
  background: linear-gradient(180deg, rgba(255, 253, 249, 0.88), rgba(246, 240, 232, 0.84));
  backdrop-filter: blur(14px);
  flex-shrink: 0;
  overflow-y: auto;
  overflow-x: hidden;
}

.side-nav.is-collapsed {
  padding: 16px 6px;
}

.dashboard-shell.is-nav-collapsed {
  grid-template-columns: 48px minmax(0, 1fr);
}

.side-nav__brand {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-bottom: 6px;
  min-height: 36px;
}

.side-nav__brand-left {
  display: flex;
  gap: 8px;
  align-items: center;
  justify-content: center;
}

.side-nav__brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--color-brand), #8f573b);
  color: white;
  font-weight: 700;
  font-size: 0.88rem;
}

.side-nav__item {
  margin: 0;
}

.side-nav.is-collapsed .side-nav__brand-copy,
.side-nav.is-collapsed .side-nav__label {
  display: none;
}

.side-nav.is-collapsed .side-nav__brand {
  justify-content: center;
  margin-bottom: 4px;
}

.side-nav__menu {
  display: grid;
  gap: 4px;
}

.side-nav__toggle {
  border: 1px solid rgba(199, 181, 163, 0.65);
  border-radius: 8px;
  background: rgba(255, 252, 247, 0.72);
  color: var(--color-text-secondary);
}

.side-nav__toggle--inline {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 26px;
  padding: 0;
  font-size: 0.8rem;
  box-shadow: 0 1px 4px rgba(53, 41, 27, 0.1);
  margin: 0 auto 12px auto;
  border-radius: 6px;
}

.side-nav__item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 8px;
  border-radius: 8px;
  color: var(--color-text-secondary);
  border: 1px solid transparent;
  position: relative;
  background: transparent;
  text-align: left;
  cursor: pointer;
  font-size: 0.92rem;
}

.side-nav.is-collapsed .side-nav__item {
  justify-content: center;
  padding: 7px 4px;
}

.side-nav__item.is-active,
.side-nav__item:hover {
  background: rgba(200, 107, 54, 0.12);
  border-color: rgba(200, 107, 54, 0.28);
  color: var(--color-text-primary);
}

.side-nav__item.is-active::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 10px;
  width: 4px;
  border-radius: 999px;
  background: linear-gradient(180deg, var(--color-brand), #a75d33);
}

.side-nav__icon {
  width: 18px;
  text-align: center;
  font-size: 14px;
  line-height: 1;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 12px;
  padding: 10px 16px 8px;
  border-bottom: 1px solid var(--color-border-weak);
  background: rgba(250, 246, 240, 0.72);
  backdrop-filter: blur(12px);
}

.topbar h1 {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  font-weight: 700;
  font-size: 1.15rem;
  white-space: nowrap;
}

.topbar__actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.topbar__link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 32px;
  padding: 0.4rem 0.7rem;
  font-size: 0.85rem;
}

.dashboard-content {
  padding: 14px 16px;
  overflow-x: hidden;
  max-width: 100%;
}

.dashboard-page {
  display: grid;
  gap: 0.75rem;
}

.section-header,
.filters,
.pager {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.section-header h2 {
  font-size: 1rem;
  margin: 0;
}

.filters--ota-devices {
  flex-wrap: wrap;
  width: auto;
  margin-left: auto;
}

.filters--trend,
.filters--users,
.filters--devices,
.filters--analytics {
  flex-wrap: nowrap;
  width: auto;
  margin-left: auto;
}

.filters--trend select {
  flex: 0 0 120px;
  width: auto;
}

.filters--trend button {
  flex: 0 0 auto;
  white-space: nowrap;
}

.filters--users input {
  flex: 1 1 160px;
  min-width: 0;
  width: auto;
}

.filters--users select {
  flex: 0 0 110px;
  width: auto;
}

.filters--users button {
  flex: 0 0 auto;
  white-space: nowrap;
  margin-left: auto;
}

.filters--devices input {
  flex: 1 1 160px;
  min-width: 0;
  width: auto;
}

.filters--devices select {
  flex: 0 0 110px;
  width: auto;
}

.filters--devices button {
  flex: 0 0 auto;
  white-space: nowrap;
}

.filters--analytics select {
  flex: 0 0 120px;
  width: auto;
}

.filters--analytics button {
  flex: 0 0 auto;
  white-space: nowrap;
}

.filters--ota-overview {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-wrap: nowrap;
  width: auto;
  margin-left: auto;
}

.filters--ota-overview input {
  width: 180px;
  min-width: 0;
}

.filters__actions {
  display: flex;
  gap: 0.65rem;
  justify-content: flex-end;
  align-items: center;
}

.filters__actions button {
  white-space: nowrap;
}

.filters--ota-devices input {
  flex: 1 1 120px;
  min-width: 0;
  width: auto;
}

.filters--ota-devices select {
  flex: 0 0 100px;
  width: auto;
}

.filters--ota-devices button {
  flex: 0 0 auto;
  white-space: nowrap;
}

.muted {
  color: var(--color-text-muted);
}

.overview-grid {
  display: grid;
  gap: 0.6rem;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
}

.overview-grid--compact {
  gap: 0.5rem;
  grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
}

.metric {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 0.6rem 0.7rem;
}

.metric strong {
  display: block;
  font-size: 1.35rem;
  margin-top: 0.15rem;
}

#overview-cards {
  gap: 0.5rem;
  grid-template-columns: repeat(auto-fit, minmax(115px, 1fr));
}

#overview-cards .metric {
  border-radius: 10px;
  padding: 0.5rem 0.6rem;
}

#overview-cards .metric .muted {
  font-size: 0.78rem;
}

#overview-cards .metric strong {
  font-size: 1.15rem;
  margin-top: 0.12rem;
}

#device-overview-cards,
#ota-overview-cards,
#analytics-overview-cards {
  gap: 0.5rem;
  grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
}

#device-overview-cards .metric,
#ota-overview-cards .metric,
#analytics-overview-cards .metric {
  border-radius: 10px;
  padding: 0.5rem 0.55rem;
}

#device-overview-cards .metric .muted,
#ota-overview-cards .metric .muted,
#analytics-overview-cards .metric .muted {
  font-size: 0.76rem;
}

#device-overview-cards .metric strong,
#ota-overview-cards .metric strong,
#analytics-overview-cards .metric strong {
  font-size: 1.1rem;
  margin-top: 0.12rem;
}

.analytics-two-column {
  display: grid;
  gap: 0.75rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.analytics-table {
  table-layout: fixed;
  width: 100%;
  font-size: 0.82rem;
}

.analytics-table th,
.analytics-table td {
  white-space: normal;
  word-break: break-word;
}

.analytics-table th:nth-child(1),
.analytics-table td:nth-child(1) {
  width: 26%;
}

.analytics-table th:nth-child(2),
.analytics-table td:nth-child(2),
.analytics-table th:nth-child(3),
.analytics-table td:nth-child(3),
.analytics-table th:nth-child(4),
.analytics-table td:nth-child(4),
.analytics-table th:nth-child(5),
.analytics-table td:nth-child(5) {
  width: 12%;
}

.analytics-table th:nth-child(6),
.analytics-table td:nth-child(6) {
  width: 26%;
}

.bar-chart {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 0.65rem;
}

.chart-bars {
  display: flex;
  align-items: end;
  gap: 0.35rem;
  min-height: 180px;
  overflow-x: auto;
  padding-bottom: 0.25rem;
}

.chart-bar-wrap {
  min-width: 32px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.3rem;
}

.chart-bar {
  width: 100%;
  min-height: 6px;
  border-radius: 12px 12px 4px 4px;
  background: linear-gradient(180deg, #3f7e66 0%, #255f4a 100%);
  display: flex;
  align-items: start;
  justify-content: center;
  color: #fff;
  font-size: 0.75rem;
  padding-top: 0.3rem;
}

.chart-label {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  text-align: center;
}

.table-wrap {
  overflow-x: auto;
  max-width: 100%;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

.table-actions {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  flex-wrap: wrap;
}

.managed-devices-table {
  table-layout: fixed;
  width: 100%;
}

.managed-devices-table th,
.managed-devices-table td {
  white-space: normal;
  word-break: break-word;
}

.managed-devices-table th:nth-child(1),
.managed-devices-table td:nth-child(1) {
  width: 10%;
  word-break: break-all;
}

.managed-devices-table th:nth-child(2),
.managed-devices-table td:nth-child(2) {
  width: 10%;
}

.managed-devices-table th:nth-child(3),
.managed-devices-table td:nth-child(3) {
  width: 18%;
}

.managed-devices-table th:nth-child(4),
.managed-devices-table td:nth-child(4) {
  width: 12%;
}

.managed-devices-table th:nth-child(5),
.managed-devices-table td:nth-child(5) {
  width: 18%;
}

.managed-devices-table th:nth-child(6),
.managed-devices-table td:nth-child(6) {
  width: 20%;
}

.managed-devices-table th:nth-child(7),
.managed-devices-table td:nth-child(7) {
  width: 12%;
}

.ota-devices-table {
  table-layout: fixed;
  width: 100%;
  font-size: 0.82rem;
}

.ota-devices-table th,
.ota-devices-table td {
  white-space: normal;
  word-break: break-word;
  padding: 0.45rem 0.35rem;
  line-height: 1.35;
}

.ota-devices-table th:nth-child(1),
.ota-devices-table td:nth-child(1) {
  width: 14%;
}

.ota-devices-table th:nth-child(2),
.ota-devices-table td:nth-child(2) {
  width: 10%;
}

.ota-devices-table th:nth-child(3),
.ota-devices-table td:nth-child(3),
.ota-devices-table th:nth-child(4),
.ota-devices-table td:nth-child(4) {
  width: 19%;
}

.ota-devices-table th:nth-child(5),
.ota-devices-table td:nth-child(5),
.ota-devices-table th:nth-child(6),
.ota-devices-table td:nth-child(6),
.ota-devices-table th:nth-child(8),
.ota-devices-table td:nth-child(8) {
  width: 8%;
}

.ota-devices-table th:nth-child(7),
.ota-devices-table td:nth-child(7) {
  width: 13%;
}

.ota-devices-table button {
  min-height: 26px;
  padding: 0.25rem 0.4rem;
  font-size: 0.74rem;
}

/* OTA页面布局优化（仅防止溢出，不缩小字体） */
[data-page="ota-management"] .card {
  max-width: 100%;
  overflow: hidden;
}

[data-page="ota-management"] .section-header {
  flex-wrap: wrap;
}

[data-page="ota-management"] .filters--ota-devices {
  flex-wrap: wrap;
  margin-left: 0;
  width: 100%;
}

[data-page="ota-management"] .table-wrap {
  overflow-x: auto;
  max-width: 100%;
}

.ota-firmware-cell {
  display: grid;
  gap: 0.12rem;
  line-height: 1.3;
}

.ota-status-cell {
  font-size: 0.74rem;
}

.ota-status-cell .status-pill.ota-status {
  font-size: 0.72rem;
  padding: 0.12rem 0.35rem;
}

th,
td {
  border-bottom: 1px solid var(--color-border);
  padding: 0.5rem 0.4rem;
  text-align: left;
  vertical-align: top;
}

tbody tr:hover {
  background: rgba(37, 95, 74, 0.04);
}

.status-pill {
  display: inline-block;
  padding: 0.15rem 0.4rem;
  border-radius: 999px;
  font-size: 0.78rem;
  background: rgba(200, 107, 54, 0.12);
  color: var(--color-brand-hover);
}

.status-pill.frozen {
  background: #f8e8c7;
  color: var(--color-warning);
}

.status-pill.deleted {
  background: #f4d9d9;
  color: var(--color-danger);
}

.status-pill.online {
  background: #d7e7df;
  color: var(--color-success);
}

.status-pill.offline {
  background: rgba(199, 181, 163, 0.28);
  color: var(--color-text-secondary);
}

.status-pill.ota-status {
  background: #eef2ef;
  color: #2c3d33;
}

.status-pill.ota-status.initiated,
.status-pill.ota-status.downloading,
.status-pill.ota-status.downloaded,
.status-pill.ota-status.verified,
.status-pill.ota-status.updating {
  background: #e6efe9;
  color: var(--color-success);
}

.status-pill.ota-status.updated {
  background: #d7e7df;
  color: var(--color-success);
}

.status-pill.ota-status.failed {
  background: #f4d9d9;
  color: var(--color-danger);
}

.detail-grid {
  display: grid;
  gap: 0.5rem;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

#session-audit .detail-grid {
  grid-template-columns: repeat(2, minmax(180px, 1fr));
}

.detail-item {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 0.55rem 0.65rem;
}

.detail-item span {
  display: block;
  color: var(--color-text-muted);
  font-size: 0.82rem;
  margin-bottom: 0.2rem;
}

.history-block {
  margin-top: 0.75rem;
}

@media (max-width: 1180px) {
  .analytics-two-column {
    grid-template-columns: 1fr;
  }
}

.history-block h3 {
  margin: 0 0 0.5rem;
  font-size: 0.92rem;
}

.detail-empty,
.error {
  color: var(--color-text-muted);
}

.error {
  color: transparent;
  min-height: 1rem;
}

.error.is-visible {
  color: var(--color-danger);
}

.error.is-visible.success {
  color: var(--color-success);
}

.hidden {
  display: none !important;
}

.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 1100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  background: rgba(25, 18, 14, 0.48);
  backdrop-filter: blur(3px);
}

.modal-card {
  width: min(100%, 460px);
  background: var(--color-bg-panel-solid);
  border: 1px solid var(--color-border);
  border-radius: 18px;
  box-shadow: var(--shadow-card);
  padding: 1rem;
}

.modal-card__header,
.modal-card__actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.modal-card__header {
  margin-bottom: 0.9rem;
}

.modal-card__header h2 {
  margin: 0 0 0.3rem;
}

.modal-card__body {
  display: grid;
  gap: 0.8rem;
}

.modal-card__body label {
  display: grid;
  gap: 0.35rem;
}

.modal-card__body input {
  width: 100%;
}

.modal-card__actions {
  justify-content: flex-end;
  margin-top: 1rem;
}

.modal-message {
  margin: 0;
  line-height: 1.5;
}

.toast-container {
  position: fixed;
  top: 12px;
  right: 12px;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 6px;
  pointer-events: none;
  max-width: 320px;
}

.toast {
  background: var(--color-bg-panel-solid);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 0.5rem 0.9rem;
  box-shadow: var(--shadow-elevated);
  font-size: 0.82rem;
  line-height: 1.45;
  opacity: 0;
  transform: translateX(20px);
  transition: opacity 300ms ease, transform 300ms ease;
  pointer-events: auto;
}

.toast.is-visible {
  opacity: 1;
  transform: translateX(0);
}

.toast--error {
  border-left: 4px solid var(--color-danger);
  color: var(--color-danger);
}

.toast--warning {
  border-left: 4px solid var(--color-warning);
  color: var(--color-warning);
}

.toast--success {
  border-left: 4px solid var(--color-success);
  color: var(--color-success);
}

@media (max-width: 960px) {
  .dashboard-shell,
  .dashboard-shell.is-nav-collapsed {
    grid-template-columns: 1fr;
  }

  .side-nav,
  .side-nav.is-collapsed {
    padding: 10px 10px;
    border-right: 0;
    border-bottom: 1px solid var(--color-border);
  }

  .side-nav__menu {
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
  }

  .side-nav.is-collapsed .side-nav__label,
  .side-nav__label {
    display: inline;
  }

  .side-nav.is-collapsed .side-nav__brand-copy {
    display: block;
  }

  .side-nav__brand-left {
    position: static;
    transform: none;
  }

  .filters--ota-devices,
  .filters--trend,
  .filters--users,
  .filters--devices {
    flex-wrap: wrap;
  }
}

@media (max-width: 700px) {
  html {
    font-size: 12px;
  }

  .topbar,
  .dashboard-content {
    padding-left: 10px;
    padding-right: 10px;
  }

  #session-audit .detail-grid {
    grid-template-columns: 1fr;
  }

  .verify-row {
    grid-template-columns: 1fr;
  }

  .modal-card__header,
  .modal-card__actions {
    align-items: stretch;
    flex-direction: column;
  }

  .modal-card__actions button,
  .modal-card__header button {
    width: 100%;
  }
}