:root {
  color-scheme: light dark;
  --bg: #f3f4f6;
  --bg-accent: radial-gradient(circle at top, rgba(148, 163, 184, 0.16), transparent 36%);
  --surface: rgba(255, 255, 255, 0.88);
  --surface-strong: #ffffff;
  --surface-muted: #f8fafc;
  --text: #0f172a;
  --text-muted: #475569;
  --text-soft: #64748b;
  --border: rgba(148, 163, 184, 0.35);
  --accent: #0f172a;
  --accent-strong: #020617;
  --accent-contrast: #ffffff;
  --ring: rgba(59, 130, 246, 0.28);
  --shadow-sm: 0 8px 20px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 18px 45px rgba(15, 23, 42, 0.1);
  --radius-sm: 12px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --container: 75rem;
  --reading: 42rem;
  --font-stack: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: clamp(1rem, 0.95rem + 0.3vw, 1.125rem);
  --text-xl: clamp(1.125rem, 1rem + 0.7vw, 1.5rem);
  --text-2xl: clamp(1.5rem, 1.2rem + 1vw, 2rem);
  --text-3xl: clamp(2rem, 1.6rem + 2vw, 3.5rem);
  --line-tight: 1.1;
  --line-copy: 1.65;
}

html[data-theme="dark"] {
  --bg: #020617;
  --bg-accent: radial-gradient(circle at top, rgba(59, 130, 246, 0.16), transparent 38%);
  --surface: rgba(15, 23, 42, 0.86);
  --surface-strong: #0f172a;
  --surface-muted: #111827;
  --text: #e2e8f0;
  --text-muted: #cbd5e1;
  --text-soft: #94a3b8;
  --border: rgba(148, 163, 184, 0.2);
  --accent: #e2e8f0;
  --accent-strong: #ffffff;
  --accent-contrast: #020617;
  --ring: rgba(125, 211, 252, 0.25);
  --shadow-sm: 0 8px 20px rgba(2, 6, 23, 0.25);
  --shadow-md: 0 20px 50px rgba(2, 6, 23, 0.45);
}

* {
  box-sizing: border-box;
}

html {
  font-family: var(--font-stack);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg-accent), var(--bg);
  color: var(--text);
  font-size: var(--text-base);
  line-height: var(--line-copy);
}

a {
  color: inherit;
}

img {
  max-width: 100%;
  height: auto;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
}

.skip-link:focus {
  left: var(--space-4);
  top: var(--space-4);
  z-index: 1000;
  padding: var(--space-3) var(--space-4);
  background: var(--surface-strong);
  border: 1px solid var(--border);
  border-radius: 999px;
}

.site-header,
.site-footer,
.site-main {
  width: min(calc(100% - 2rem), var(--container));
  margin: 0 auto;
}

.site-header {
  padding: var(--space-8) 0 var(--space-6);
}

.site-header__inner,
.site-footer__inner,
.hero__layout,
.section-heading,
.actions--inline {
  display: flex;
  gap: var(--space-6);
  align-items: flex-start;
  justify-content: space-between;
}

.site-header__inner,
.site-footer__inner {
  align-items: center;
  flex-wrap: wrap;
}

.site-branding {
  display: grid;
  gap: var(--space-2);
}

.site-kicker,
.section-kicker,
.hero__eyebrow,
.tool-panel__eyebrow {
  margin: 0;
  color: var(--text-soft);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.site-title {
  font-size: var(--text-xl);
  font-weight: 700;
  line-height: var(--line-tight);
  text-decoration: none;
}

.site-nav {
  margin-left: auto;
}

.site-nav__list {
  display: flex;
  gap: var(--space-3);
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav a,
.theme-toggle,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: 0.75rem 1rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  text-decoration: none;
  transition: transform 160ms ease, border-color 160ms ease, background-color 160ms ease, box-shadow 160ms ease;
}

.site-nav a,
.theme-toggle,
.button--ghost {
  background: var(--surface);
  backdrop-filter: blur(10px);
}

.site-nav a[aria-current="page"],
.button--primary {
  background: linear-gradient(180deg, var(--accent), var(--accent-strong));
  color: var(--accent-contrast);
  border-color: transparent;
  box-shadow: var(--shadow-sm);
}

.site-main {
  padding: 0 0 var(--space-20);
}

.page-shell {
  display: grid;
  gap: var(--space-16);
}

.section {
  display: grid;
  gap: var(--space-8);
}

.section--tight {
  gap: var(--space-6);
}

.section-heading {
  flex-wrap: wrap;
  gap: var(--space-4);
}

.section-heading h2,
.hero__title,
.tool-panel__title,
.feature-card__title,
.page-header h1 {
  margin: 0;
  line-height: var(--line-tight);
}

.section-heading h2,
.tool-panel__title {
  font-size: var(--text-2xl);
}

.section-copy,
.hero__copy,
.feature-card__text,
.tool-panel__hint,
.site-footer__meta,
.status-message {
  color: var(--text-muted);
}

.hero {
  position: relative;
  padding-top: var(--space-4);
}

.hero__layout {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(18rem, 0.8fr);
  gap: var(--space-8);
  align-items: stretch;
}

.hero__content,
.hero__panel,
.tool-panel,
.feature-card,
.site-footer {
  border: 1px solid var(--border);
  background: var(--surface);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-md);
}

.hero__content,
.hero__panel,
.tool-panel,
.site-footer {
  border-radius: var(--radius-lg);
}

.hero__content {
  padding: var(--space-12);
  display: grid;
  gap: var(--space-6);
}

.hero__title {
  max-width: 12ch;
  font-size: var(--text-3xl);
}

.hero__copy {
  max-width: var(--reading);
  margin: 0;
  font-size: var(--text-lg);
}

.hero__actions {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.hero__panel {
  padding: var(--space-8);
}

.hero__metrics {
  display: grid;
  gap: var(--space-4);
}

.hero__metric {
  padding: var(--space-5);
  background: var(--surface-muted);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}

.hero__metric-label {
  display: block;
  margin-bottom: var(--space-2);
  font-size: var(--text-xs);
  color: var(--text-soft);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.hero__metric-value {
  font-size: var(--text-lg);
}

.tool-panel {
  padding: var(--space-8);
}

.tool-panel__header {
  display: flex;
  gap: var(--space-4);
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  margin-bottom: var(--space-6);
}

.tool-grid,
.feature-grid {
  display: grid;
  gap: var(--space-6);
}

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

.feature-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.feature-card {
  padding: var(--space-6);
  border-radius: var(--radius-md);
}

.feature-card__title {
  margin-bottom: var(--space-3);
  font-size: var(--text-lg);
}

.field-group {
  display: grid;
  gap: var(--space-3);
}

.field-group--compact {
  margin: 0;
}

label {
  display: inline-block;
  font-size: var(--text-sm);
  font-weight: 700;
}

textarea,
button {
  width: 100%;
  font: inherit;
}

textarea {
  min-height: 20rem;
  padding: var(--space-5);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  resize: vertical;
  background: var(--surface-muted);
  color: var(--text);
  box-shadow: inset 0 1px 2px rgba(15, 23, 42, 0.04);
}

.output {
  background: var(--surface-strong);
}

button {
  cursor: pointer;
}

.actions {
  margin-top: var(--space-6);
}

.actions--inline {
  gap: var(--space-4);
  align-items: center;
}

.actions--inline .button {
  width: auto;
  min-width: 12rem;
}

.status-message {
  min-height: 1.5rem;
  margin: 0;
  flex: 1;
  font-size: var(--text-sm);
}

.site-footer {
  width: min(calc(100% - 2rem), var(--container));
  margin: var(--space-16) auto 0;
  padding: var(--space-6);
}

.site-footer__title,
.site-footer__meta {
  margin: 0;
}

.site-footer__meta {
  margin-top: var(--space-2);
}

.site-nav a:hover,
.site-nav a:focus-visible,
.theme-toggle:hover,
.theme-toggle:focus-visible,
.button:hover,
.button:focus-visible,
textarea:focus-visible {
  outline: 2px solid transparent;
  box-shadow: 0 0 0 4px var(--ring);
}

.site-nav a:hover,
.theme-toggle:hover,
.button:hover {
  transform: translateY(-1px);
}

@media (max-width: 960px) {
  .hero__layout,
  .tool-grid,
  .feature-grid {
    grid-template-columns: 1fr;
  }

  .hero__title {
    max-width: none;
  }
}

@media (max-width: 720px) {
  .site-header,
  .site-footer,
  .site-main {
    width: min(calc(100% - 1.25rem), var(--container));
  }

  .site-header {
    padding-top: var(--space-6);
  }

  .site-header__inner,
  .site-footer__inner,
  .site-nav__list,
  .actions--inline {
    align-items: stretch;
  }

  .site-nav,
  .site-nav__list,
  .actions--inline .button {
    width: 100%;
  }

  .site-nav__list,
  .actions--inline {
    flex-direction: column;
  }

  .hero__content,
  .hero__panel,
  .tool-panel,
  .site-footer {
    padding: var(--space-6);
  }

  textarea {
    min-height: 16rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition: none !important;
  }
}