:root {
  color-scheme: dark;
  --bg: #07111f;
  --bg-soft: #0c1829;
  --card: #101d31;
  --card-border: #263954;
  --text: #e6edf7;
  --muted: #a9b7ca;
  --accent: #39d98a;
  --accent-strong: #1fcf78;
  --danger: #ff7b72;
  --shadow: 0 24px 80px rgb(0 0 0 / 0.35);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top left, rgb(57 217 138 / 0.18), transparent 34rem),
    radial-gradient(circle at top right, rgb(63 131 248 / 0.16), transparent 28rem),
    var(--bg);
  color: var(--text);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  line-height: 1.5;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

.site-header {
  padding: 1rem;
}

.nav {
  align-items: center;
  display: flex;
  gap: 1rem;
  justify-content: space-between;
  margin: 0 auto;
  max-width: 1120px;
  padding: 0.75rem 0;
}

.brand,
.nav-links {
  align-items: center;
  display: flex;
  gap: 0.75rem;
}

.brand {
  font-weight: 800;
  letter-spacing: -0.02em;
}

.brand-mark {
  align-items: center;
  background: var(--accent);
  border-radius: 0.75rem;
  color: #04101d;
  display: inline-flex;
  font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
  height: 2.25rem;
  justify-content: center;
  width: 2.25rem;
}

.nav-links {
  color: var(--muted);
  flex-wrap: wrap;
  font-size: 0.95rem;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--accent);
}

.hero {
  align-items: center;
  display: grid;
  gap: 2rem;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.9fr);
  margin: 3rem auto 3rem;
  max-width: 1120px;
  text-align: left;
}

.eyebrow,
.tool-kicker {
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  margin: 0 0 0.65rem;
  text-transform: uppercase;
}

h1,
h2 {
  letter-spacing: -0.04em;
  line-height: 1.05;
  margin: 0;
}

h1 {
  font-size: clamp(2.5rem, 7vw, 5.5rem);
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
}

.hero-copy {
  color: var(--muted);
  font-size: 1.15rem;
  margin: 1.25rem 0 0;
  max-width: 720px;
}

.tool-index {
  display: grid;
  gap: 0.6rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 0;
  text-align: left;
}

.tool-index-card {
  background: rgb(255 255 255 / 0.06);
  border: 1px solid var(--card-border);
  border-radius: 1rem;
  color: var(--text);
  display: grid;
  gap: 0.25rem;
  padding: 0.75rem;
}

.tool-index-card span {
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.tool-index-card:hover,
.tool-index-card:focus-visible {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgb(57 217 138 / 0.12);
}

.workspace {
  align-items: start;
  display: grid;
  gap: 1.25rem;
  grid-template-columns: 240px minmax(0, 1fr);
  margin: 0 auto;
  max-width: 1360px;
  padding: 1rem 1rem 4rem;
}

.sidebar {
  background: rgb(255 255 255 / 0.04);
  border: 1px solid var(--card-border);
  border-radius: 1.25rem;
  display: grid;
  gap: 1rem;
  padding: 1rem;
  position: sticky;
  top: 1rem;
}

.sidebar-title,
.sidebar-group p {
  margin: 0;
}

.sidebar-title {
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.sidebar-group {
  display: grid;
  gap: 0.4rem;
}

.sidebar-group p {
  color: var(--text);
  font-weight: 800;
}

.sidebar-group a {
  color: var(--muted);
  font-size: 0.92rem;
}

.sidebar-group a:hover,
.sidebar-group a:focus-visible {
  color: var(--accent);
}

.container {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  min-width: 0;
}

.tool-card {
  background: linear-gradient(180deg, rgb(255 255 255 / 0.04), transparent), var(--card);
  border: 1px solid var(--card-border);
  border-radius: 1.25rem;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  min-width: 0;
  padding: 1.25rem;
}

.tool-card:nth-child(2),
.tool-card:nth-child(5),
.tool-card:nth-child(6) {
  grid-row: span 2;
}

.tool-heading {
  align-items: flex-start;
  display: flex;
  gap: 1rem;
  justify-content: space-between;
}

label {
  color: var(--muted);
  display: grid;
  gap: 0.45rem;
  font-size: 0.95rem;
}

.helper-text {
  color: var(--muted);
  margin: 0;
}

input,
textarea {
  background: var(--bg-soft);
  border: 1px solid var(--card-border);
  border-radius: 0.8rem;
  color: var(--text);
  outline: none;
  padding: 0.8rem 0.9rem;
  width: 100%;
}

textarea {
  min-height: 8rem;
  resize: vertical;
}

input:focus,
textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgb(57 217 138 / 0.12);
}

.form-grid {
  display: grid;
  gap: 0.85rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.wide-form-grid {
  align-items: start;
}

.checkbox-label {
  align-items: center;
  display: flex;
  gap: 0.5rem;
}

.checkbox-label input {
  accent-color: var(--accent);
  height: 1rem;
  padding: 0;
  width: 1rem;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.preset-grid {
  display: grid;
  gap: 0.65rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

#diff {
  grid-column: 1 / -1;
}

.primary-button,
.secondary-button {
  border: 0;
  border-radius: 999px;
  font-weight: 800;
  padding: 0.75rem 1rem;
}

.primary-button {
  background: var(--accent);
  color: #04101d;
}

.primary-button:hover,
.primary-button:focus-visible {
  background: var(--accent-strong);
}

.secondary-button {
  background: rgb(255 255 255 / 0.08);
  color: var(--text);
}

.secondary-button:hover,
.secondary-button:focus-visible {
  background: rgb(255 255 255 / 0.14);
}

.output {
  background: #050b14;
  border: 1px solid var(--card-border);
  border-radius: 0.9rem;
  color: var(--text);
  display: block;
  min-height: 3.5rem;
  overflow-wrap: anywhere;
  padding: 0.95rem;
  white-space: pre-wrap;
}

.output.error {
  border-color: rgb(255 123 114 / 0.65);
  color: var(--danger);
}

.monospace {
  font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
  font-size: 0.92rem;
}

.footer {
  color: var(--muted);
  padding: 0 1rem 2rem;
  text-align: center;
}

@media (max-width: 1280px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero {
    display: block;
    margin-top: 2.5rem;
  }

  .tool-index {
    margin-top: 2rem;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .workspace {
    display: block;
    padding-top: 0;
  }

  .sidebar {
    margin-bottom: 1.25rem;
    position: static;
  }

  .sidebar-group {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .sidebar-group p {
    grid-column: 1 / -1;
  }

  .container,
  .form-grid,
  .preset-grid,
  .wide-form-grid {
    grid-template-columns: 1fr;
  }

  .tool-card:nth-child(2),
  .tool-card:nth-child(5),
  .tool-card:nth-child(6) {
    grid-row: span 1;
  }
}

@media (max-width: 520px) {
  .tool-index {
    grid-template-columns: 1fr;
  }

  .sidebar-group {
    grid-template-columns: 1fr;
  }
}