* {
  box-sizing: border-box;
}

:root {
  --bg: #ffffff;
  --text: #111;
  --card: #f9fafb;
  --border: #ddd;
  --accent: #1f2933;
}

body.dark {
  --bg: #0f1115;
  --text: #e4e6eb;
  --card: #1b202b;
  --border: #2a2f3a;
}

body {
  margin: 0;
  font-family: Calibri, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
}

.skip-link {
  position: absolute;
  top: -40px;
  background: #000;
  color: #fff;
  padding: 0.5rem;
}

.skip-link:focus {
  top: 0;
}

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

.site-header {
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: 1200px;
  margin: auto;
  padding: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-list {
  list-style: none;
  display: flex;
  gap: 1rem;
  padding: 0;
  margin: 0;
}

.nav-list a {
  text-decoration: none;
  font-weight: bold;
  color: var(--text);
}

.grid-container {
  max-width: 1200px;
  margin: auto;
  padding: 2rem 1rem;
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 2rem;
}

.hero {
  grid-column: 1 / -1;
  text-align: center;
}

.content {
  grid-column: span 6;
}

.card {
  background: var(--card);
  padding: 2rem;
  border-radius: 14px;
}

.media-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
}

.switch-thumb img {
  width: 12px;
  height: 12px;
}

.interface-slider {
  width: 100%;
  max-width: 100%;
}

.interface-slider .labels {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.75rem;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.03em;
}

.interface-slider input[type="range"] {
  width: 100%;
  height: 6px;
  cursor: pointer;
}

.output {
  margin-top: 1rem;
  padding: 1rem;
  background: #ffffff;
  color: #111;
  border-left: 4px solid var(--accent);
  border-radius: 6px;
}

.toggle {
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
}

.switch {
  width: 50px;
  height: 26px;
  border-radius: 999px;
  display: flex;
  align-items: center;
  padding: 3px;
  box-sizing: border-box;
  background: #e0e0e0;
  transition: background 0.25s ease;
}

.switch-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #fff;

  display: flex;
  align-items: center;
  justify-content: center;

  transition: transform 0.25s ease;
}

.switch-thumb img {
  width: 12px;
  height: 12px;
}

body.dark .switch {
  background: #444;
}

body.dark .switch-thumb {
  transform: translateX(22px);
}

body.dark .output {
  background: #232838;
  color: #f1f5f9;
  border-left-color: #8ab4f8;
}


.site-footer {
  text-align: center;
  border-top: 1px solid var(--border);
  padding: 1rem;
}

@media (max-width: 768px) {
  .grid-container {
    grid-template-columns: 1fr;
  }
}