:root {
  --retro-bg: #1e1e1e;
  --retro-fg: #fafafa;
  --retro-accent: #ffcb6b;
  --retro-alt: #f78c6c;
  --retro-blue: #82aaff;
  --retro-green: #c3e88d;
  --retro-red: #ff5370;
}

[data-theme="light"] {
  --retro-bg: #ffffff;
  --retro-fg: #222222;
}

body {
  margin: 0;
  font-family: 'Roboto Mono', monospace;
  background: var(--retro-bg);
  color: var(--retro-fg);
  line-height: 1.6;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem;
  background: var(--retro-alt);
  color: var(--retro-bg);
  position: sticky;
  top: 0;
  z-index: 1000;
}

nav a {
  color: var(--retro-bg);
  text-decoration: none;
  margin: 0 0.75rem;
  font-weight: bold;
}

nav a:hover {
  color: var(--retro-fg);
}

main {
  max-width: 960px;
  margin: 2rem auto;
  padding: 0 1rem;
}

main section {
  margin-bottom: 3rem;
}

main section:not(.active) {
  display: none;
}

button.dark-toggle {
  background: var(--retro-blue);
  color: var(--retro-bg);
  border: none;
  padding: 0.5rem 0.75rem;
  font-size: 1rem;
  cursor: pointer;
  border-radius: 0.3rem;
}

select.lang-switch {
  background: var(--retro-bg);
  color: var(--retro-fg);
  border: 1px solid var(--retro-alt);
  padding: 0.3rem;
  border-radius: 0.3rem;
  margin-left: 0.5rem;
}

select,
button {
  font-family: inherit;
  font-size: 1rem;
  padding: 0.5rem 1rem;
  background: var(--retro-alt);
  border: 1px solid var(--retro-alt);
  border-radius: 0.5rem;
  color: var(--retro-bg);
  cursor: pointer;
  transition: all 0.2s ease-in-out;
}

select:hover,
button:hover {
  background: var(--retro-accent)
}

select:focus,
button:focus {
  outline: 2px solid var(--retro-blue);
}

select {
  appearance: none;
  background-image:
    linear-gradient(45deg, transparent 50%, var(--retro-bg) 50%),
    linear-gradient(135deg, var(--retro-bg) 50%, transparent 50%);
  background-position:
    calc(100% - 1.2rem) center,
    calc(100% - 0.8rem) center;
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
  padding-right: 2rem;
}

.tool-section {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--retro-alt);
  padding: 1rem;
  border-radius: 0.5rem;
  margin-top: 1.5rem;
}

input[type="range"] {
  width: 100%;
}

input[type="number"],
input[type="text"] {
  padding: 0.5rem;
  font-size: 1rem;
  border: 1px solid var(--retro-alt);
  border-radius: 0.4rem;
  background-color: rgba(255, 255, 255, 0.05);
  color: var(--retro-fg);
  box-sizing: border-box;
  margin-bottom: 0.5rem;
}

input[type="date"] {
  background-color: rgba(255, 255, 255, 0.05);
  color: var(--retro-fg);
  border: 1px solid var(--retro-alt);
  border-radius: 0.4rem;
  padding: 0.5rem;
  font-size: 1rem;
  font-family: 'Roboto Mono', monospace;
  box-sizing: border-box;
  margin-bottom: 0.5rem;
  transition: border-color 0.2s ease-in-out, background-color 0.2s ease-in-out;
}

input[type="date"]:focus {
  outline: none;
  border-color: var(--retro-blue);
  background-color: rgba(255, 255, 255, 0.08);
}

.output {
  font-size: 1.2rem;
  background: var(--retro-blue);
  color: var(--retro-bg);
  padding: 0.5rem;
  border-radius: 0.3rem;
  word-break: break-all;
  margin-top: 0.5rem;
}