:root {
  --color-paper: #f8f9fa;
  --color-ink: #212529;
  --color-body: #495057;
  --color-muted: #6c757d;
  --color-faint: #adb5bd;
  --color-rule: #dee2e6;
  --color-accent: #343a40;
  --color-accent-soft: #e9ecef;
  --font-sans: "Geist", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-mono: "Geist Mono", ui-monospace, "SF Mono", Consolas, monospace;
  --measure: 40rem;
  --gutter: clamp(1.25rem, 4vw, 2rem);
}

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

html {
  background: var(--color-paper);
  color: var(--color-ink);
}

body {
  margin: 0;
  min-height: 100dvh;
  background: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--color-accent);
}

a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

.wrap {
  width: min(100% - 2 * var(--gutter), var(--measure));
  margin-inline: auto;
  padding-block: clamp(2rem, 6vh, 3.5rem) clamp(3rem, 10vh, 5rem);
}

/* —— header —— */

.site-header {
  display: flex;
  align-items: baseline;
  gap: 0.65rem 1rem;
  flex-wrap: wrap;
  margin-bottom: clamp(2.5rem, 7vh, 3.75rem);
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--color-rule);
}

.mark {
  display: inline-flex;
  flex-shrink: 0;
  width: 1.35rem;
  height: 1.35rem;
  translate: 0 0.15rem;
  color: var(--color-accent);
}

.mark img,
.mark svg {
  display: block;
  width: 100%;
  height: 100%;
}

.brand {
  font-family: var(--font-sans);
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1;
}

.header-meta {
  color: var(--color-muted);
  font-size: 0.8125rem;
}

.header-meta a {
  color: var(--color-ink);
  text-decoration: none;
  border-bottom: 1px solid var(--color-rule);
}

.header-meta a:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.sep {
  color: var(--color-faint);
  user-select: none;
}

/* —— thesis —— */

.thesis {
  margin: 0 0 clamp(2.75rem, 8vh, 4rem);
  max-width: 34rem;
  color: var(--color-body);
  font-size: 0.9375rem;
  line-height: 1.65;
}

.thesis p {
  margin: 0 0 0.85em;
}

.thesis p:last-child {
  margin-bottom: 0;
}

.note {
  display: block;
  margin-top: 1rem;
  color: var(--color-accent);
  font-size: 0.75rem;
  line-height: 1.5;
}

.note::before {
  content: "// ";
}

/* —— tools —— */

.section-label {
  margin: 0 0 1.25rem;
  color: var(--color-accent);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.tools {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--color-rule);
}

.tool {
  margin: 0;
  padding: 1.35rem 0 1.45rem;
  border-bottom: 1px solid var(--color-rule);
}

.tool-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.35rem 0.55rem;
  margin-bottom: 0.65rem;
  font-size: 0.8125rem;
}

.tool-name {
  font-family: var(--font-sans);
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.tool-cat {
  color: var(--color-muted);
}

.tool-status {
  display: inline-block;
  padding: 0.12rem 0.4rem;
  border-radius: 2px;
  background: var(--color-accent-soft);
  color: var(--color-accent);
  font-size: 0.6875rem;
  letter-spacing: 0.02em;
}

.tool-body {
  margin: 0;
  color: var(--color-body);
  font-size: 0.875rem;
  line-height: 1.6;
}

.tool-body code {
  font-family: inherit;
  font-size: 0.92em;
  padding: 0.05em 0.28em;
  border-radius: 2px;
  background: var(--color-accent-soft);
  color: var(--color-ink);
}

.tool-why {
  color: var(--color-muted);
}

.tool-links {
  margin-top: 0.75rem;
  font-size: 0.8125rem;
}

.tool-links a {
  color: var(--color-ink);
  text-decoration: none;
}

.tool-links a:hover {
  color: var(--color-accent);
}

.tool-links a::before {
  content: "→ ";
  color: var(--color-accent);
}

.tool-links .also {
  display: block;
  margin-top: 0.25rem;
  color: var(--color-muted);
  font-size: 0.75rem;
}

.tool-links .also a {
  color: var(--color-muted);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.15em;
}

.tool-links .also a::before {
  content: none;
}

.tool-links .also a:hover {
  color: var(--color-accent);
}

/* —— footer —— */

.site-footer {
  margin-top: clamp(2.75rem, 8vh, 4rem);
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-rule);
  color: var(--color-muted);
  font-size: 0.8125rem;
  line-height: 1.65;
}

.site-footer p {
  margin: 0 0 0.85em;
  max-width: 34rem;
}

.site-footer p:last-child {
  margin-bottom: 0;
}

.site-footer a {
  color: var(--color-ink);
}

.site-footer a:hover {
  color: var(--color-accent);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  margin-top: 1.1rem;
  font-size: 0.8125rem;
}