* {
  box-sizing: border-box;
}

:root {
  --color-bg: #212121;
  --color-panel: #181818;
  --color-input: #303030;
  --color-text: #ddeace;
  --color-accent: #fa423e;
  --color-border: #4a4a4a;
  --color-muted-border: #333;
  --color-muted-text: #b7c4aa;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  font-size: 16px;
}

.page {
  max-width: 1020px;
  margin: 0 auto;
  padding: 42px 20px 60px;
}

h1 {
  margin: 0 0 26px;
  font-size: 2.15rem;
  line-height: 1.15;
}

.intro {
  max-width: 960px;
  margin: 0 0 20px;
  font-size: 1.05rem;
  line-height: 1.5;
}

.content-wrap {
  display: grid;
  grid-template-columns: 486px minmax(0, 1fr);
  gap: 18px;
  align-items: start;
}

#valley-of-the-kings {
  margin: 0;
  padding: 18px;
  width: 100%;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  background: var(--color-panel);
}

#errors {
  min-height: 1.2em;
  margin-bottom: 8px;
  color: var(--color-accent);
  font-weight: bold;
}

#arc {
  width: 100%;
  margin: 0;
  padding: 0;
  border-collapse: collapse;
}

#arc td {
  padding: 0.5em;
  vertical-align: middle;
}

#arc p {
  margin: 0;
}

#arc hr {
  height: 1px;
  margin: 16px 0 18px;
  border: 0;
  background: var(--color-muted-border);
}

#arc input {
  width: 100%;
  max-width: 180px;
  margin-left: 8px;
  padding: 0.5em;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  color: var(--color-text);
  background: var(--color-input);
}

#arc input:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 1px;
}

.equals-cell {
  width: 24px;
  text-align: center;
  font-weight: bold;
}

.select-label {
  display: block;
  margin: 0;
  padding: 0;
}

#ratios {
  width: 100%;
  max-width: 300px;
  height: 30px;
  margin-top: 6px;
  border: 1px solid var(--color-border);
  color: var(--color-text);
  background: var(--color-input);
}

.checkbox-row {
  display: block;
  margin: 1em 0;
  padding: 0;
}

.checkbox-row input,
.crop-options input {
  accent-color: var(--color-accent);
}

.ratio-output {
  margin-top: 0;
}

#ratio {
  font-weight: bold;
}

#visual-ratio {
  position: relative;
  width: 200px;
  height: 150px;
  line-height: 150px;
  margin: 1em 0;
  padding: 0;
  overflow: hidden;
  border: 1px solid var(--color-border);
  color: var(--color-text);
  background: var(--color-input);
  text-align: center;
}

#visual-ratio img {
  position: absolute;
  top: 0;
  left: 0;
}

#croptions {
  margin: 1em 0;
  padding: 0 1em;
  border: 1px solid var(--color-muted-border);
  background: var(--color-panel);
}

.image-source-row {
  display: block;
  margin: 1em 0;
  padding: 0;
}

.image-source-row input {
  width: 300px;
  max-width: 100%;
  margin-left: 8px;
  padding: 0.5em;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  color: var(--color-text);
  background: var(--color-input);
}

.crop-options {
  display: block;
  margin: 1em 0;
  padding: 0;
}

.croptions-example {
  position: relative;
  top: 3px;
  display: inline-block;
  width: 20px;
  height: 15px;
  margin: 0 0.5em -3px 0.1em;
  padding: 0;
  border: 2px solid var(--color-text);
  background:
    linear-gradient(
      to right,
      var(--color-text) 0 15%,
      var(--color-input) 15% 85%,
      var(--color-text) 85% 100%
    );
}

.croptions-example.crop {
  background:
    linear-gradient(
      to bottom,
      var(--color-text) 0 18%,
      var(--color-input) 18% 82%,
      var(--color-text) 82% 100%
    );
}

.tooltip {
  border-bottom: 1px dotted var(--color-muted-text);
  cursor: help;
}

.instructions {
  font-size: 1rem;
  line-height: 1.45;
}

.instructions h2 {
  margin: 8px 0 14px;
  font-size: 1.55rem;
  line-height: 1.2;
}

.instructions ol {
  margin: 0 0 28px 1.35em;
  padding: 0;
}

.instructions li {
  width: 90%;
  margin-bottom: 8px;
}

.instructions p {
  margin: 0 0 18px;
}

pre {
  max-width: 100%;
  margin: 0 0 1em;
  overflow-x: auto;
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--color-text);
}

a,
.reset {
  color: var(--color-accent);
}

button,
input,
select,
textarea {
  font-family: inherit;
}

::selection {
  color: var(--color-bg);
  background: var(--color-accent);
}

.error-message {
  color: var(--color-accent);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

@media (max-width: 900px) {
  .page {
    max-width: 720px;
  }

  .content-wrap {
    grid-template-columns: 1fr;
  }

  #valley-of-the-kings {
    max-width: 486px;
  }
}

@media (max-width: 560px) {
  .page {
    padding: 28px 14px 48px;
  }

  h1 {
    font-size: 1.85rem;
  }

  .intro {
    font-size: 1rem;
  }

  #valley-of-the-kings {
    max-width: none;
  }

  #arc,
  #arc tbody,
  #arc tr,
  #arc td {
    display: block;
    width: 100%;
  }

  .equals-cell {
    width: 100%;
    padding: 0;
  }

  #arc input {
    max-width: none;
    margin: 6px 0 0;
  }

  #ratios {
    max-width: none;
  }
}