:root {
  color-scheme: light dark;

  --background: #f2f2f2;
  --surface: #ffffff;
  --surface-muted: #e6e6e6;
  --text: #1a1a1a;
  --text-muted: #555555;
  --border: #c8c8c8;

  --accent: #0078d7;
  --accent-dark: #005a9e;
  --accent-text: #ffffff;

  --success: #107c10;
  --warning: #ffb900;
  --danger: #d13438;

  --font-sans:
    "Segoe UI",
    system-ui,
    -apple-system,
    blinkmacsystemfont,
    sans-serif;

  --font-mono:
    "Cascadia Mono",
    "Consolas",
    "Liberation Mono",
    monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --background: #1b1b1b;
    --surface: #242424;
    --surface-muted: #333333;
    --text: #f2f2f2;
    --text-muted: #c8c8c8;
    --border: #555555;

    --accent: #00bcf2;
    --accent-dark: #0099bc;
    --accent-text: #000000;
  }
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  background: var(--background);
  color: var(--text);
  font-family: var(--font-sans);
  line-height: 1.5;
}

body {
  margin: 0;
}

button,
textarea {
  font: inherit;
}

button {
  border-radius: 0;
}

.container {
  width: min(1180px, calc(100% - 32px));
  margin-inline: auto;
}

.site-header {
  padding: 40px 0 28px;
  background: var(--accent);
  color: var(--accent-text);
}

.header-content {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 24px;
  align-items: center;
}


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

h1 {
  margin-bottom: 10px;
  font-size: clamp(2.1rem, 5vw, 4.2rem);
  font-weight: 300;
  line-height: 1.05;
  letter-spacing: -0.04em;
}

h2 {
  margin-bottom: 16px;
  font-size: 1.35rem;
  font-weight: 300;
  letter-spacing: -0.02em;
}

.lead {
  max-width: 760px;
  margin-bottom: 0;
  font-size: 1.05rem;
  color: var(--accent-text);
  opacity: 0.9;
}

.app-icon {
  display: block;
  width: 76px;
  height: 76px;
}

main.container {
  padding-top: 24px;
}

.notice,
.details,
.editor-panel,
.stats-panel {
  border: 1px solid var(--border);
  background: var(--surface);
}

.notice {
  padding: 22px 24px;
  margin-bottom: 24px;
  border-left: 8px solid var(--accent);
}

.notice ul {
  display: grid;
  gap: 6px;
  padding-left: 1.25rem;
  margin: 0;
  color: var(--text-muted);
}

.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(320px, 0.85fr);
  gap: 24px;
  align-items: start;
}

.editor-panel,
.stats-panel,
.details {
  padding: 24px;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 14px;
}

.panel-header h2 {
  margin: 0;
}

.secondary-button {
  min-height: 40px;
  padding: 7px 18px;
  border: 2px solid var(--accent);
  background: var(--accent);
  color: var(--accent-text);
  cursor: pointer;
  font-weight: 600;
}

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

.secondary-button:focus-visible {
  outline: 3px solid var(--text);
  outline-offset: 2px;
}

.secondary-button:active {
  transform: translateY(1px);
}

.text-input {
  display: block;
  width: 100%;
  min-height: min(54vh, 580px);
  resize: vertical;
  padding: 16px;
  border: 2px solid var(--border);
  background: var(--background);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
}

.text-input::placeholder {
  color: var(--text-muted);
  opacity: 0.8;
}

.text-input:focus {
  outline: none;
  border-color: var(--accent);
  background: var(--surface);
}

.input-note {
  margin: 12px 0 0;
  color: var(--text-muted);
  font-size: 0.92rem;
}

.stats-panel h2 {
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border);
}

.stats-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin: 0;
}

.stat-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 16px;
  align-items: center;
  min-height: 64px;
  padding: 14px 16px;
  border: 1px solid var(--border);
  background: var(--surface-muted);
}

.stat-card-primary {
  min-height: 86px;
  border: none;
  background: var(--accent);
  color: var(--accent-text);
}

.stat-card dt {
  color: var(--text-muted);
  font-size: 0.92rem;
}

.stat-card-primary dt {
  color: var(--accent-text);
  opacity: 0.9;
}

.stat-card dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1.45rem;
  font-weight: 600;
  line-height: 1.1;
}

.stat-card-primary dd {
  font-size: 2.1rem;
  font-weight: 400;
}

.details {
  margin-top: 24px;
  border-top: 8px solid var(--accent);
}

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

.details p:last-child {
  margin-bottom: 0;
}

.site-footer {
  padding: 32px 0 48px;
  color: var(--text-muted);
  font-size: 0.92rem;
}

.footer-content {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  align-items: center;
  justify-content: space-between;
}

.site-footer p {
  margin-bottom: 0;
}

.repo-link {
  display: inline-flex;
  gap: 8px;
  align-items: center;
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

.repo-link:hover {
  color: var(--text);
}

.repo-link:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

.repo-link-icon {
  flex: none;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}

@media (max-width: 860px) {
  .header-content {
    grid-template-columns: 1fr;
  }

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

  .app-icon {
    display: none;
  }
}

@media (max-width: 560px) {
  .container {
    width: min(100% - 24px, 1180px);
  }

  .site-header {
    padding-top: 32px;
  }

  main.container {
    padding-top: 16px;
  }

  .notice,
  .details,
  .editor-panel,
  .stats-panel {
    padding: 18px;
  }

  .panel-header {
    align-items: stretch;
    flex-direction: column;
  }

  .secondary-button {
    width: 100%;
  }

  .footer-content {
    align-items: flex-start;
    flex-direction: column;
  }

  .stat-card {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .stat-card-primary dd {
    font-size: 1.8rem;
  }
}