:root {
  color-scheme: light dark;

  --color-page: #f7f7f8;
  --color-surface: #ffffff;
  --color-surface-elevated: #ffffff;
  --color-surface-muted: #f3f4f6;

  --color-text-primary: #030712;
  --color-text-secondary: #4b5563;
  --color-text-muted: #6b7280;
  --color-text-inverse: #ffffff;

  --color-border: #e5e7eb;
  --color-border-subtle: #eef2f7;

  --color-action: #e5e7eb;
  --color-action-hover: #d1d5db;
  --color-action-disabled-bg: #f3f4f6;
  --color-action-disabled-text: #9ca3af;
  --color-disabled-bg: var(--color-action-disabled-bg);
  --color-disabled-text: var(--color-action-disabled-text);

  --color-success: #059669;
  --color-success-bg: #ecfdf5;
  --color-warning: #d97706;
  --color-warning-bg: #fffbeb;
  --color-danger: #dc2626;
  --color-danger-bg: #fef2f2;
  --color-neutral: #6b7280;
  --color-neutral-bg: #f3f4f6;
  --color-info: #4f46e5;
  --color-info-bg: #eef2ff;

  --color-status-ready: var(--color-info);
  --color-status-checking: var(--color-info);
  --color-status-online: var(--color-success);
  --color-status-limited: var(--color-warning);
  --color-status-offline: var(--color-neutral);
  --color-status-failed: var(--color-danger);

  --color-badge-idle-bg: var(--color-info-bg);
  --color-badge-idle-text: var(--color-info);
  --color-badge-working-bg: var(--color-success-bg);
  --color-badge-working-text: var(--color-success);
  --color-badge-unreachable-bg: var(--color-neutral-bg);
  --color-badge-unreachable-text: var(--color-text-secondary);
  --color-badge-failed-bg: var(--color-danger-bg);
  --color-badge-failed-text: var(--color-danger);

  --font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-title-size: 24px;
  --font-title-line-height: 32px;
  --font-body-size: 16px;
  --font-body-line-height: 24px;
  --font-label-size: 14px;
  --font-label-line-height: 20px;
  --font-caption-size: 12px;
  --font-caption-line-height: 16px;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-7: 32px;

  --radius-card: 24px;
  --radius-badge: 999px;
  --radius-button: 16px;
  --shadow-card: none;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-page: #030712;
    --color-surface: #111827;
    --color-surface-elevated: #111827;
    --color-surface-muted: #1f2937;

    --color-text-primary: #f7f7f8;
    --color-text-secondary: #d1d5db;
    --color-text-muted: #4b5563;
    --color-text-inverse: #030712;

    --color-border: #d1d5db;
    --color-border-subtle: #374151;

    --color-action: #1f2937;
    --color-action-hover: #374151;
    --color-action-disabled-bg: #1f2937;
    --color-action-disabled-text: #4b5563;
    --color-disabled-bg: var(--color-action-disabled-bg);
    --color-disabled-text: var(--color-action-disabled-text);

    --color-success: #ffffff;
    --color-success-bg: #059669;
    --color-warning: #fffbeb;
    --color-warning-bg: #d97706;
    --color-danger: #ffffff;
    --color-danger-bg: #dc2626;
    --color-neutral: #d1d5db;
    --color-neutral-bg: #1f2937;
    --color-info: #ffffff;
    --color-info-bg: #4f46e5;

    --color-status-ready: var(--color-text-primary);
    --color-status-checking: var(--color-text-primary);
    --color-status-online: var(--color-text-primary);
    --color-status-limited: var(--color-text-primary);
    --color-status-offline: var(--color-text-primary);
    --color-status-failed: var(--color-text-primary);

    --color-badge-idle-bg: #4f46e5;
    --color-badge-idle-text: #ffffff;
    --color-badge-working-bg: #059669;
    --color-badge-working-text: #ffffff;
    --color-badge-unreachable-bg: #1f2937;
    --color-badge-unreachable-text: #d1d5db;
    --color-badge-failed-bg: #dc2626;
    --color-badge-failed-text: #ffffff;
  }
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--color-page);
  color: var(--color-text-primary);
  font-family: var(--font-family);
}

body {
  min-width: 360px;
  min-height: 100vh;
  min-height: 100svh;
  margin: 0;
  overflow-x: hidden;
  background: var(--color-page);
  color: var(--color-text-primary);
  font-family: var(--font-family);
  font-size: var(--font-body-size);
  line-height: var(--font-body-line-height);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

button {
  font: inherit;
}

.app {
  width: 100%;
  max-width: 440px;
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  margin-inline: auto;
  padding-top: max(var(--space-4), env(safe-area-inset-top));
  padding-right: max(var(--space-4), env(safe-area-inset-right));
  padding-bottom: max(var(--space-4), env(safe-area-inset-bottom));
  padding-left: max(var(--space-4), env(safe-area-inset-left));
}

.panel {
  width: 100%;
  min-height: calc(
    100svh
    - max(var(--space-4), env(safe-area-inset-top))
    - max(var(--space-4), env(safe-area-inset-bottom))
  );
  display: flex;
  flex-direction: column;
}

.status-card {
  width: 100%;
  padding: var(--space-6);
  border: 0;
  border-radius: var(--radius-card);
  background: var(--color-surface-elevated);
  box-shadow: var(--shadow-card);
}

.status-card + .status-card {
  margin-top: var(--space-2);
}

.card-heading {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  align-items: center;
  gap: var(--space-3);
}

.card-heading h2,
.card-heading h3 {
  margin: 0;
  color: var(--color-text-primary);
  font-size: 20px;
  font-weight: 600;
  line-height: 28px;
  letter-spacing: 0;
}

.state-mark {
  width: 56px;
  height: 56px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background-color: var(--state-icon-bg, var(--color-neutral-bg));
  color: var(--state-icon-color, var(--color-neutral));
}

.state-mark::before {
  content: "";
  width: 36px;
  height: 36px;
  display: block;
  background-color: currentColor;
  -webkit-mask: var(--state-icon) center / contain no-repeat;
  mask: var(--state-icon) center / contain no-repeat;
}

.state-mark::after {
  content: none;
}

.status-card--checking .state-mark::before {
  animation: spin 0.75s linear infinite;
}

#internet-card .card-heading,
.qa-card--internet .card-heading {
  min-height: 72px;
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-border-subtle);
}

#internet-card.status-card--idle,
.qa-card--internet.status-card--idle {
  --state-icon: url("./icons/internet/ready.svg");
  --state-icon-color: var(--color-info);
  --state-icon-bg: var(--color-info-bg);
}

#internet-card.status-card--checking,
.qa-card--internet.status-card--checking {
  --state-icon: url("./icons/internet/checking.svg");
  --state-icon-color: var(--color-info);
  --state-icon-bg: var(--color-info-bg);
}

#internet-card.status-card--online,
.qa-card--internet.status-card--online {
  --state-icon: url("./icons/internet/online.svg");
  --state-icon-color: var(--color-success);
  --state-icon-bg: var(--color-success-bg);
}

#internet-card.status-card--limited,
.qa-card--internet.status-card--limited {
  --state-icon: url("./icons/internet/limited.svg");
  --state-icon-color: var(--color-warning);
  --state-icon-bg: var(--color-warning-bg);
}

#internet-card.status-card--offline,
.qa-card--internet.status-card--offline {
  --state-icon: url("./icons/internet/offline.svg");
  --state-icon-color: var(--color-text-secondary);
  --state-icon-bg: var(--color-neutral-bg);
}

#internet-card.status-card--failed,
.qa-card--internet.status-card--failed {
  --state-icon: url("./icons/internet/failed.svg");
  --state-icon-color: var(--color-danger);
  --state-icon-bg: var(--color-danger-bg);
}

#youtube-card.status-card--idle,
.qa-card--video.status-card--idle {
  --state-icon: url("./icons/video/ready.svg");
  --state-icon-color: var(--color-info);
  --state-icon-bg: var(--color-info-bg);
}

#youtube-card.status-card--checking,
.qa-card--video.status-card--checking {
  --state-icon: url("./icons/video/checking.svg");
  --state-icon-color: var(--color-info);
  --state-icon-bg: var(--color-info-bg);
}

#youtube-card.status-card--works,
.qa-card--video.status-card--works {
  --state-icon: url("./icons/video/works.svg");
  --state-icon-color: var(--color-success);
  --state-icon-bg: var(--color-success-bg);
}

#youtube-card.status-card--offline,
.qa-card--video.status-card--offline {
  --state-icon: url("./icons/video/offline.svg");
  --state-icon-color: var(--color-text-secondary);
  --state-icon-bg: var(--color-neutral-bg);
}

#youtube-card.status-card--failed,
.qa-card--video.status-card--failed {
  --state-icon: url("./icons/video/failed.svg");
  --state-icon-color: var(--color-danger);
  --state-icon-bg: var(--color-danger-bg);
}

.detail-list {
  display: grid;
  gap: var(--space-2);
  margin: 0;
  padding-top: var(--space-4);
}

.detail-list > div {
  min-height: 36px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-3);
}

.detail-list dt {
  color: var(--color-text-secondary);
  font-size: var(--font-body-size);
  font-weight: 400;
  line-height: var(--font-body-line-height);
}

.detail-list dd {
  margin: 0;
}

.detail-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 32px;
  max-width: 100%;
  padding: 6px var(--space-3);
  border-radius: var(--radius-badge);
  background: var(--color-badge-idle-bg);
  color: var(--color-badge-idle-text);
  font-size: var(--font-caption-size);
  font-weight: 600;
  line-height: var(--font-caption-line-height);
  text-align: center;
  white-space: nowrap;
}

.detail-badge--idle {
  background: var(--color-badge-idle-bg);
  color: var(--color-badge-idle-text);
}

.detail-badge--checking {
  background: var(--color-badge-idle-bg);
  color: var(--color-badge-idle-text);
}

.detail-badge--working {
  background: var(--color-badge-working-bg);
  color: var(--color-badge-working-text);
}

.detail-badge--unreachable {
  background: var(--color-badge-unreachable-bg);
  color: var(--color-badge-unreachable-text);
}

.detail-badge--failed {
  background: var(--color-badge-failed-bg);
  color: var(--color-badge-failed-text);
}

.actions {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: var(--space-2);
  margin-top: auto;
  padding-top: var(--space-6);
  padding-bottom: var(--space-7);
}

.actions button {
  min-width: 0;
  min-height: 56px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 var(--space-4);
  border: 0;
  border-radius: var(--radius-button);
  background: var(--color-action);
  color: var(--color-text-primary);
  cursor: pointer;
  font-size: 18px;
  font-weight: 600;
  line-height: 24px;
  letter-spacing: 0;
  text-align: center;
  transition:
    background-color 120ms ease,
    color 120ms ease,
    transform 80ms ease;
}

@media (hover: hover) {
  .actions button:not(:disabled):hover {
    background: var(--color-action-hover);
  }
}

@media (min-width: 441px) {
  .panel {
    min-height: auto;
  }

  .actions {
    margin-top: var(--space-6);
    padding-top: 0;
    padding-bottom: var(--space-7);
  }
}

.actions button:disabled {
  background: var(--color-disabled-bg);
  color: var(--color-disabled-text);
  cursor: not-allowed;
  transform: none;
}

.actions button:not(:disabled):active {
  background: color-mix(in srgb, var(--color-action) 88%, var(--color-text-primary));
  transform: translateY(1px);
}

.actions button:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--color-info) 32%, transparent);
  outline-offset: 2px;
}

.youtube-player-host {
  position: fixed;
  left: -10000px;
  top: 0;
  width: 160px;
  height: 90px;
  overflow: hidden;
  pointer-events: none;
  opacity: 0;
}

.youtube-player-host iframe {
  width: 160px !important;
  height: 90px !important;
  display: block;
  border: 0;
}

.qa-app {
  width: 100%;
  max-width: 1040px;
  min-height: 100vh;
  min-height: 100svh;
  margin-inline: auto;
  padding:
    max(var(--space-4), env(safe-area-inset-top))
    max(var(--space-4), env(safe-area-inset-right))
    max(var(--space-7), env(safe-area-inset-bottom))
    max(var(--space-4), env(safe-area-inset-left));
}

.qa-header {
  margin-bottom: var(--space-7);
}

.qa-header h1 {
  margin: 0;
  font-size: var(--font-title-size);
  font-weight: 650;
  line-height: var(--font-title-line-height);
}

.qa-header p {
  margin: var(--space-1) 0 0;
  color: var(--color-text-secondary);
  font-size: var(--font-body-size);
  line-height: var(--font-body-line-height);
}

.qa-section + .qa-section {
  margin-top: var(--space-7);
}

.qa-section > h2 {
  margin: 0 0 var(--space-4);
  font-size: 18px;
  font-weight: 600;
  line-height: 24px;
}

.qa-grid {
  display: grid;
  gap: var(--space-3);
}

.qa-grid .status-card + .status-card {
  margin-top: 0;
}

.qa-card--internet .state-mark::before,
.qa-card--video .state-mark::before {
  display: none;
}

.qa-state-icon {
  width: 36px;
  height: 36px;
  display: block;
  overflow: visible;
  stroke: currentColor;
  stroke-width: 2.25;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.status-card--checking .qa-state-icon {
  animation: spin 0.75s linear infinite;
}

.qa-badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  padding: var(--space-4);
  border-radius: var(--radius-card);
  background: var(--color-surface-elevated);
}

@media (min-width: 720px) {
  .qa-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1040px) {
  .qa-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}