@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=IBM+Plex+Serif:ital,wght@0,400;0,500;0,600;1,400&display=swap');

:root {
  --bg-color: #000000;
  --bg-color-secondary: #0a0a0a;
  --text-color: #ffffff;
  --text-color-low-emphasis: #888888;
  --text-code-color: #cccccc;
  --border-color: #333333;
  --cyan-accent: #00ffff;
  --cyan-dim: #00cccc;

  --accent-gradient-start-dark: #00ffff;
  --accent-gradient-end-dark: #00cccc;
  --accent-gradient-faded-dark: rgba(0, 255, 255, 0.15);

  --accent-gradient-start-light: #00cccc;
  --accent-gradient-end-light: #008888;
  --accent-gradient-faded-light: rgba(0, 204, 204, 0.2);

  --accent-gradient-current-start: var(--accent-gradient-start-dark);
  --accent-gradient-current-end: var(--accent-gradient-end-dark);
  --accent-gradient-current-faded: var(--accent-gradient-faded-dark);

  --focus-outline-color: var(--cyan-accent);
  --link-color-solid: var(--cyan-accent);
  --link-hover-color-solid: var(--cyan-dim);

  --header-bg: rgba(0, 0, 0, 0.9);
  --footer-bg: rgba(0, 0, 0, 0.95);
  --input-bg: #111111;
  --input-border: #333333;
  --table-header-bg: #0a0a0a;
  --table-row-even-bg: #050505;
  --error-color: #ff4444;
  --error-bg: rgba(255, 68, 68, 0.1);
  --error-border: rgba(255, 68, 68, 0.3);
  --success-color: var(--cyan-accent);
  --success-bg: var(--accent-gradient-current-faded);
  --success-border: rgba(0, 255, 255, 0.3);

  --transition-duration-fast: 0.16s;
  --transition-duration-medium: 0.3s;
  --transition-duration-slow: 0.5s;
  --content-max-width: 1024px;
  --focus-ring: 0 0 0 2px var(--bg-color), 0 0 0 4px var(--focus-outline-color);
  --border-radius-small: 0.25rem;
  --border-radius-medium: 0.5rem;
  --padding-small: 0.5rem;
  --padding-medium: 1rem;
  --padding-large: 1.5rem;
  --margin-small: 0.5rem;
  --margin-medium: 1rem;
  --margin-large: 1.5rem;
  --header-height: 60px;
  --header-link-font-size: 0.9rem;
}

html.light-mode,
body.light-mode {
  --bg-color: #ffffff;
  --bg-color-secondary: #fafafa;
  --text-color: #000000;
  --text-color-low-emphasis: #666666;
  --text-code-color: #333333;
  --border-color: #cccccc;
  --cyan-accent: #00aaaa;
  --cyan-dim: #008888;

  --accent-gradient-current-start: var(--accent-gradient-start-light);
  --accent-gradient-current-end: var(--accent-gradient-end-light);
  --accent-gradient-current-faded: var(--accent-gradient-faded-light);

  --link-color-solid: var(--cyan-accent);
  --link-hover-color-solid: var(--cyan-dim);

  --header-bg: rgba(255, 255, 255, 0.9);
  --footer-bg: rgba(250, 250, 250, 0.95);
  --input-bg: #ffffff;
  --input-border: #cccccc;
  --table-header-bg: #f5f5f5;
  --table-row-even-bg: #fafafa;
  --error-color: #cc0000;
  --error-bg: rgba(204, 0, 0, 0.1);
  --error-border: rgba(204, 0, 0, 0.3);
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + var(--padding-small));
}

body {
  background-color: var(--bg-color);
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
  color: var(--text-color);
  line-height: 1.7;
  transition: background-color var(--transition-duration-slow) ease,
    color var(--transition-duration-slow) ease;
  overflow-x: hidden;
}

:focus-visible,
button:focus-visible,
select:focus-visible,
input:focus-visible,
textarea:focus-visible,
a:focus-visible {
  outline: 2px solid transparent;
  outline-offset: 2px;
  box-shadow: var(--focus-ring);
  border-radius: var(--border-radius-small);
}

.text-gradient {
  color: var(--cyan-accent);
  display: inline-block;
}

*:focus:not(:focus-visible) {
  outline: none;
  box-shadow: none;
}

a,
.link-button {
  color: var(--link-color-solid);
  text-decoration: none;
  position: relative;
  transition: opacity var(--transition-duration-fast) ease,
    color var(--transition-duration-fast) ease;
  font-size: inherit;
  font-family: inherit;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  display: inline;
  line-height: inherit;
}

a:not(.text-gradient):hover,
.link-button:not(.text-gradient):hover {
  color: var(--link-hover-color-solid);
}

a.text-gradient,
.link-button.text-gradient {
  color: var(--cyan-accent) !important;
}

a::after,
.link-button::after {
  content: "";
  position: absolute;
  width: 0;
  height: 1px;
  bottom: -3px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--cyan-accent);
  transition: width 0.05s cubic-bezier(0.25, 0.1, 0.25, 1);
}

a:hover::after,
a:focus-visible::after,
.link-button:hover::after,
.link-button:focus-visible::after {
  width: 100%;
}

a.text-gradient:hover,
.link-button.text-gradient:hover {
  opacity: 0.85;
}
a.text-gradient::after,
.link-button.text-gradient::after {
  bottom: 0px;
}

*:not(a):not(.link-button).text-gradient::after {
  display: none;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: var(--border-radius-medium);
  margin: var(--margin-large) auto;
}

h1,
h2,
h3 {
  margin-bottom: 0.8em;
  line-height: 1.3;
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-weight: 600;
}

h1.text-gradient,
h2.text-gradient,
h3.text-gradient,
span.tagline.text-gradient {
  display: block;
}

h1 {
  font-size: clamp(1.8rem, 5vw, 2.8rem);
}
h2 {
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  margin-top: var(--margin-large);
}
h3 {
  font-size: clamp(1.2rem, 3vw, 1.6rem);
}

p {
  margin-bottom: var(--margin-medium);
}

hr {
  border: 0;
  height: 1px;
  background: repeating-linear-gradient(
    90deg,
    var(--border-color),
    var(--border-color) 4px,
    transparent 4px,
    transparent 8px
  );
  margin: var(--margin-large) 0;
}

code {
  font-family: monospace, "Courier New", Courier;
  background-color: color-mix(in srgb, var(--text-code-color) 15%, transparent);
  color: var(--text-code-color);
  padding: 0.2em 0.4em;
  border-radius: var(--border-radius-small);
  font-size: 0.9em;
  word-break: break-word;
}

pre {
  background-color: color-mix(in srgb, var(--text-code-color) 10%, transparent);
  padding: var(--padding-medium);
  border-radius: var(--border-radius-medium);
  overflow-x: auto;
  margin-bottom: var(--margin-large);
}

pre code {
  background-color: transparent;
  padding: 0;
  font-size: 0.85em;
  line-height: 1.4;
}

blockquote {
  border-left: 2px dashed var(--cyan-accent);
  padding-left: var(--padding-medium);
  margin: var(--margin-large) 0;
  font-style: italic;
  color: var(--text-color-low-emphasis);
}

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

[hidden] {
  display: none !important;
}

.main-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background-color: var(--header-bg);
  backdrop-filter: blur(5px);
  padding: var(--padding-small) var(--padding-medium);
  height: var(--header-height);
  z-index: 256;
  border-bottom: 2px dotted var(--border-color);
  display: flex;
  align-items: center;
  gap: var(--margin-medium);
  transition: background-color var(--transition-duration-slow) ease,
    border-color var(--transition-duration-slow) ease;
}

.main-header .header-title-area {
  display: flex;
  align-items: baseline;
  gap: 0.5em;
  flex-grow: 1;
  min-width: 0;
}

.main-header a.main-title-link {
  display: inline-block;
  color: transparent !important;
  text-decoration: none;
}
.main-header a.main-title-link:hover,
.main-header a.main-title-link:focus-visible {
  opacity: 0.85;
}

.main-header .main-title {
  margin: 0;
  font-size: 1.2rem;
  line-height: 1;
  white-space: nowrap;
}

span.tagline {
  display: inline-block;
  font-size: 0.8rem;
  font-style: oblique 8deg;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  line-height: 1.2;
  opacity: 0.8;
  align-self: baseline;
  padding-top: 0.1em;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: var(--margin-medium);
  margin-left: auto;
  flex-shrink: 0;
}

.header-controls .link-button,
.header-controls a.header-nav-link {
  font-size: var(--header-link-font-size);
  padding: 0.25rem 0;
  text-decoration: underline;
}

theme-toggle-button {
  display: inline-flex;
}

.main-content-area {
  max-width: var(--content-max-width);
  margin: calc(var(--header-height) + var(--margin-medium)) auto
    var(--margin-large) auto;
  padding: 0 var(--padding-medium);
  min-height: calc(100vh - var(--header-height) - 150px);
  transition: opacity var(--transition-duration-fast) ease-out;
}

.main-footer {
  margin-top: calc(2 * var(--margin-large));
  padding: var(--padding-large);
  text-align: center;
  background-color: var(--footer-bg);
  border-top: 2px dashed var(--border-color);
  color: var(--text-color-low-emphasis);
  font-size: 0.9rem;
  transition: background-color var(--transition-duration-slow) ease,
    border-color var(--transition-duration-slow) ease;
}

@media (max-width: 768px) {
  .main-header .header-title-area {
    flex-grow: 1;
    min-width: 0;
    margin-right: var(--margin-small);
    align-items: flex-start;
  }
  .main-header a.main-title-link .main-title {
    font-size: 1.1rem;
  }
  span.tagline {
    font-size: 0.7rem;
  }
  .header-controls {
    gap: var(--margin-small);
  }
  .header-controls .link-button,
  .header-controls a.header-nav-link {
    font-size: 0.85rem;
  }
  theme-toggle-button {
    transform: scale(0.9);
  }
}

@media (min-width: 768px) {
  :root {
    --header-height: 70px;
    --header-link-font-size: 1rem;
  }

  .main-header {
    padding: var(--padding-medium) var(--padding-large);
  }
  .main-header .header-title-area {
    gap: 0.75em;
  }
  .header-controls {
    gap: var(--margin-large);
  }

  .main-header a.main-title-link .main-title {
    font-size: 1.5rem;
  }

  span.tagline {
    font-size: 0.9rem;
    opacity: 1;
    padding-top: 0.2em;
  }

  .main-content-area {
    padding: 0 var(--padding-large);
    margin-top: calc(var(--header-height) + var(--margin-large));
  }
}