:root {
  --font-sf: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", system-ui, "Segoe UI", sans-serif;
  --bg: #000000;
  --bg-elevated: #111114;
  --surface: #1c1c1e;
  --surface-strong: #232326;
  --text: #ffffff;
  --text-muted: rgba(235, 235, 245, 0.66);
  --text-subtle: rgba(235, 235, 245, 0.48);
  --border: rgba(255, 255, 255, 0.12);
  --accent: #ff453a;
  --accent-strong: #ff3b30;
  --accent-soft: rgba(255, 69, 58, 0.18);
  --link: #ff6961;
  --link-hover: #ff7b74;
  --focus: #0a84ff;
  --ok: #32d74b;
  --warn: #ffd60a;
  --danger: #ff453a;
  --radius-card: 18px;
  --radius-control: 12px;
}

.light-mode {
  --bg: #f2f2f7;
  --bg-elevated: #f7f7fa;
  --surface: #ffffff;
  --surface-strong: #f7f7fb;
  --text: #111114;
  --text-muted: rgba(48, 48, 55, 0.88);
  --text-subtle: rgba(48, 48, 55, 0.74);
  --border: rgba(36, 36, 44, 0.2);
  --accent-soft: rgba(255, 59, 48, 0.1);
  --link: #d63a2f;
  --link-hover: #bf3127;
  --ok: #2e7d32;
  --warn: #9a6700;
  --danger: #c62828;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-family: var(--font-sf);
  text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background: var(--bg);
  transition: background-color 0.22s ease, color 0.22s ease;
}

button:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.topnav {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.9rem;
  padding: calc(0.8rem + env(safe-area-inset-top, 0px)) 1rem 0.8rem 1rem;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
}

.topnav-brand {
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 0.72rem;
}

.brand-icon {
  width: 2.0rem;
  height: 2.0rem;
  display: block;
  object-fit: contain;
  border: 0;
  background: transparent;
  padding: 0;
}

.brand-copy {
  min-width: 0;
}

.brand-kicker {
  margin: 0 0 0.08rem 0;
  color: var(--text-subtle);
  font-size: 0.7rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.topnav h1 {
  margin: 0;
  font-size: clamp(1.04rem, 0.8rem + 1.04vw, 1.3rem);
  letter-spacing: -0.02em;
  line-height: 1.14;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.topnav-actions {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.topnav-meta {
  display: flex;
  gap: 0.38rem;
}

.meta-chip {
  min-width: 0;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.34rem 0.52rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
}

.meta-label {
  display: inline-flex;
  align-items: center;
  font-size: 0.62rem;
  font-weight: 700;
  line-height: 1.2;
  transform: translateY(0.04rem);
  color: var(--text-subtle);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.meta-dot {
  width: 0.42rem;
  height: 0.42rem;
  align-self: center;
  border-radius: 50%;
  background: var(--text-subtle);
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.18) inset;
}

.meta-value {
  display: inline-flex;
  align-items: center;
  font-size: 0.62rem;
  font-weight: 700;
  line-height: 1.2;
  transform: translateY(0.04rem);
  letter-spacing: 0.02em;
}

.meta-value.is-ready {
  color: var(--ok);
}

.meta-value.is-syncing {
  color: var(--warn);
}

.meta-value.is-offline {
  color: var(--danger);
}

.meta-chip.is-ready .meta-dot {
  background: var(--ok);
}

.meta-chip.is-syncing .meta-dot {
  background: var(--warn);
  animation: status-dot-pulse 1.15s ease-in-out infinite;
}

.meta-chip.is-offline .meta-dot {
  background: var(--danger);
}

@keyframes status-dot-pulse {
  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.45;
    transform: scale(0.86);
  }
}

@media (prefers-reduced-motion: reduce) {
  .meta-chip.is-syncing .meta-dot {
    animation: none;
  }
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.34rem 0.66rem;
  min-width: 4.6rem;
  background: var(--surface-strong);
  color: var(--text-muted);
  font-size: 0.72rem;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition: background-color 0.16s ease, color 0.16s ease, border-color 0.16s ease;
}

.theme-toggle:hover {
  color: var(--text);
}

.page-shell {
  width: min(1180px, 100%);
  margin: 0 auto;
}

.content {
  padding: 1rem;
}

.card {
  margin-bottom: 0.9rem;
  width: min(860px, 100%);
  margin-left: auto;
  margin-right: auto;
  padding: 1rem 1.1rem;
  border-radius: var(--radius-card);
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: 0 10px 22px rgba(0, 0, 0, 0.3);
  transition: transform 0.2s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.2s ease;
}

.light-mode .card {
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

@media (hover: hover) and (pointer: fine) {
  .card:hover {
    transform: translateY(-3px);
    box-shadow: 0 16px 28px rgba(0, 0, 0, 0.34);
  }

  .light-mode .card:hover {
    box-shadow: 0 10px 22px rgba(0, 0, 0, 0.12);
  }
}

.card--hero {
  border-top: 3px solid var(--accent);
}

.card-title {
  margin: 0 0 0.8rem 0;
  color: var(--text-subtle);
  font-size: 0.94rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.card-title--flash {
  display: inline-flex;
  align-items: center;
  gap: 0.42rem;
}

.card-title--info {
  display: inline-flex;
  align-items: center;
  gap: 0.42rem;
}

.card-title__icon {
  display: inline-flex;
  color: var(--text-subtle);
}

.status-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.68rem;
  padding: 0.72rem 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.8rem;
}

.status-item:last-of-type {
  border-bottom: none;
}

.status-item--wrap {
  align-items: flex-start;
}

.status-item__label {
  display: inline-flex;
  align-items: center;
  gap: 0.34rem;
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.76rem;
}

.status-item__value {
  text-align: right;
  font-weight: 600;
}

.status-item__value--mono {
  max-width: 70%;
  word-break: break-all;
  font-size: inherit;
  font-family: inherit;
  font-weight: 600;
  letter-spacing: 0;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

.hint {
  margin: 0 0 0.72rem 0;
  color: var(--text-muted);
  line-height: 1.44;
  font-size: 0.85rem;
}

.install-wrapper {
  margin-top: 0.15rem;
  width: 100%;
}

.install-wrapper esp-web-install-button {
  display: block;
  width: 100%;
}

.flash-support-message {
  display: block;
  color: var(--text);
  font-size: 1.04rem;
  line-height: 1.28;
  font-weight: 500;
}

.hint--flash {
  margin: 0.56rem 0 0;
  font-style: italic;
}

.flash-mode-switch {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
  margin: 0 0 0.72rem;
}

.mode-btn {
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface-strong);
  color: var(--text-muted);
  min-height: 2.3rem;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease, background-color 0.15s ease;
}

.mode-btn:hover {
  color: var(--text);
}

.mode-btn.is-active {
  border-color: #d63a2f;
  background: var(--accent-soft);
  color: #ffffff;
}

.mode-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn {
  width: 100%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.42rem;
  min-height: 3rem;
  border-radius: var(--radius-control);
  padding: 0.68rem 0.9rem;
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 650;
  line-height: 1.1;
  letter-spacing: 0;
  transition: transform 0.12s ease, filter 0.12s ease, opacity 0.12s ease;
}

.btn:hover {
  filter: brightness(1.03);
}

.btn .icon-inline {
  margin-right: 0;
  vertical-align: baseline;
  transform: none;
  font-size: 1.12em;
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  border: 1px solid #d63a2f;
  color: #ffffff;
  background: var(--accent-strong);
}

.btn-secondary {
  margin-top: 0.74rem;
  border: 1px solid var(--border);
  color: var(--text);
  background: var(--surface-strong);
  font-weight: 700;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.footer {
  padding: 1.36rem 1rem calc(1.36rem + env(safe-area-inset-bottom, 0px));
  text-align: center;
  color: var(--text-subtle);
  font-size: 0.78rem;
}

.footer p {
  margin: 0.16rem 0;
}

.footer a {
  color: var(--link);
  text-decoration: none;
  font-weight: 600;
}

.footer a:hover {
  color: var(--link-hover);
  text-decoration: underline;
}

.light-mode .brand-kicker,
.light-mode .card-title,
.light-mode .hint,
.light-mode .footer {
  color: rgba(50, 50, 58, 0.78);
}

.light-mode .status-item__label {
  color: rgba(45, 45, 52, 0.9);
}

.light-mode .meta-chip {
  background: #ffffff;
}

.light-mode .meta-label {
  color: rgba(45, 45, 52, 0.78);
}

.light-mode .theme-toggle {
  background: #ffffff;
  border-color: rgba(45, 45, 52, 0.22);
  color: #1a1a1f;
}

.light-mode .mode-btn {
  background: #ffffff;
  border-color: rgba(45, 45, 52, 0.24);
  color: #1c1c22;
}

.light-mode .mode-btn.is-active {
  border-color: #c63329;
  background: #ff3b30;
  color: #ffffff;
}

.light-mode .btn-secondary {
  background: #f7f7fb;
  border-color: rgba(45, 45, 52, 0.24);
  color: #17171c;
}

.material-icons {
  font-family: "Material Icons";
  font-weight: normal;
  font-style: normal;
  font-size: 20px;
  display: inline-block;
  line-height: 1;
  text-transform: none;
  letter-spacing: normal;
  white-space: nowrap;
  word-wrap: normal;
  direction: ltr;
  -webkit-font-smoothing: antialiased;
}

.icon-inline {
  font-size: 1.02em;
  vertical-align: -0.12em;
  margin-right: 0.26em;
}

.icon-small {
  font-size: 0.78em;
  vertical-align: -0.08em;
  margin-right: 0.06em;
}

@media (max-width: 760px) {
  .topnav {
    align-items: flex-start;
    flex-direction: column;
  }

  .topnav-actions {
    width: 100%;
    justify-content: space-between;
  }

  .topnav-meta {
    max-width: calc(100% - 5.3rem);
    overflow-x: auto;
    padding-bottom: 0.1rem;
  }
}

@media (max-width: 520px) {
  .content {
    padding: 0.76rem;
  }

  .card {
    padding: 0.92rem;
    border-radius: 16px;
  }
}