:root {
  color-scheme: light;
  --background: #ffffff;
  --text: #000000;
  --muted: #555555;
  --subtle: #777777;
  --disabled: #999999;
  --line: #eeeeee;
  --key-line: #222222;
  --key-muted-line: #dddddd;
  --pressed: #d8d8d8;
  --keyboard-width: 638px;
  font-family: Pretendard, SUIT, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--background);
}

body {
  min-height: 100vh;
  margin: 0;
  background: var(--background);
  color: var(--text);
  letter-spacing: 0;
}

button,
a {
  font: inherit;
}

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.page {
  width: min(100%, 1400px);
  margin: 0 auto;
  padding: 48px 24px 24px;
}

.page-nav {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 32px;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 600;
}

.page-nav a {
  color: var(--text);
}

.page-header {
  width: min(100%, 560px);
}

.brand-label {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 600;
}

.page-header h1 {
  margin: 0;
  font-size: clamp(1.92rem, 4vw, 2.7rem);
  font-weight: 650;
  line-height: 1.15;
}

.keymap-comparison {
  margin-top: 32px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 32px;
}

.layer-panel {
  min-width: 0;
  padding-top: 18px;
  border-top: 1px solid var(--text);
}

.layer-header {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 18px;
}

.layer-index {
  margin: 2px 0 0;
  color: var(--disabled);
  font-size: 0.8rem;
  font-weight: 600;
  line-height: 1.4;
}

.layer-header h2 {
  margin: 0;
  font-size: 1.06rem;
  font-weight: 650;
  line-height: 1.4;
}

.layer-header p:not(.layer-index) {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 0.8rem;
  line-height: 1.5;
}

.keyboard-viewport {
  position: relative;
  width: 100%;
  height: 324px;
  overflow: hidden;
  overflow: clip;
  padding: 2px 0 0;
}

.keyboard {
  position: relative;
  width: var(--keyboard-width);
  min-width: var(--keyboard-width);
  height: 322px;
  transform-origin: left top;
}

.hand-label {
  position: absolute;
  top: 0;
  margin: 0;
  color: var(--subtle);
  font-size: 0.72rem;
  font-weight: 600;
  line-height: 1;
}

.hand-label.left {
  left: 139px;
}

.hand-label.right {
  left: 489px;
}

.key {
  position: absolute;
  width: 44px;
  height: 42px;
  padding: 2px;
  border: 1px solid var(--key-line);
  border-radius: 3px;
  background: #ffffff;
  color: var(--text);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  font-size: 0.74rem;
  font-weight: 650;
  line-height: 1.05;
  letter-spacing: 0;
  user-select: none;
  touch-action: manipulation;
  transition: background-color 70ms linear, border-color 70ms linear, transform 70ms linear;
}

.key:hover {
  background: #f5f5f5;
}

.key:focus-visible {
  outline: 2px solid var(--text);
  outline-offset: 2px;
  z-index: 3;
}

.key.is-inherited {
  border-color: var(--key-muted-line);
  color: var(--disabled);
  background: #fafafa;
}

.key.is-optional {
  border-color: var(--subtle);
  border-style: dashed;
  color: var(--subtle);
  background: #f7f7f7;
}

.key.is-pressed,
.key[aria-pressed="true"] {
  border-color: var(--text);
  background: var(--pressed);
  color: var(--text);
  transform: translateY(1px);
}

.notes {
  width: min(100%, 560px);
  margin-top: 20px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.65;
}

.notes p {
  margin: 0;
  display: flex;
  align-items: center;
  gap: 10px;
}

.notes p + p {
  margin-top: 8px;
}

.sample-key {
  flex: 0 0 auto;
  width: 22px;
  height: 22px;
  border: 1px solid var(--key-muted-line);
  background: #fafafa;
}

.sample-key.optional {
  border-color: var(--subtle);
  border-style: dashed;
  background: #f7f7f7;
}

@media (max-width: 900px) {
  .page {
    width: min(100%, 720px);
    padding: 24px 24px 8px;
  }

  .page-nav {
    margin-bottom: 24px;
  }

  .keymap-comparison {
    grid-template-columns: minmax(0, 1fr);
    margin-top: 24px;
    gap: 24px;
  }

  .keyboard-viewport {
    width: min(100%, 440px);
  }

  .notes {
    display: none;
  }
}

@media (max-width: 640px) {
  .page {
    padding: 20px 20px 4px;
  }

  .page-nav {
    margin-bottom: 20px;
  }

  .page-header h1 {
    font-size: clamp(1.52rem, 6.2vw, 1.95rem);
  }

  .keymap-comparison {
    margin-top: 20px;
    gap: 24px;
  }

}

@media (prefers-reduced-motion: reduce) {
  .key {
    transition: none;
  }
}