/* ts-comment-scanner — site styles
   Material: a light "diff paper" — the page borrows the visual language of a
   code review, because that is where this tool lives. Every color carries
   diff semantics: red deletes, blue is a directive/action, green is comment
   text. Dark scheme flips the paper, not the language. */

:root {
  --paper: #fafbfc;
  --panel: #ffffff;
  --ink: #1f2328;
  --slate: #59636e;
  --faint: #8b949e;
  --rule: #d8dee5;
  --scan-red: #c9333f;
  --scan-red-tint: #ffedec;
  --ts-blue: #2f6fb4;
  --ts-blue-tint: #e8f0f9;
  --comment-green: #47805a;
  --navy: #0f2237;
  --navy-edge: #1b3a5c;
  --code-base: #d7e3ee;
  --code-slate: #6d8296;
  --code-kw: #7cb2e8;
  --code-str: #e0b76c;
  --code-cmt: #6fa987;
  --code-red: #ff8189;
  --chip-red: #e5484d;
  --shadow: 0 24px 60px -24px rgba(15, 34, 55, 0.35);
  /* Latin runs in Plex Mono; kana/kanji fall through to Plex Sans JP (or a
     Japanese system font) so CJK glyphs always take their Japanese forms
     (直, 経, ...), never a generic CJK fallback's Chinese ones. */
  --mono:
    "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", "IBM Plex Sans JP",
    "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Noto Sans JP", "Noto Sans CJK JP", Meiryo, monospace;
  --sans:
    "IBM Plex Sans JP", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial,
    "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Noto Sans JP", "Noto Sans CJK JP", Meiryo, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #0d1420;
    --panel: #121c2b;
    --ink: #dee7f0;
    --slate: #97a4b1;
    --faint: #6d7a87;
    --rule: #23324a;
    --scan-red: #f0555f;
    --scan-red-tint: #3a1a20;
    --ts-blue: #6aa8e8;
    --ts-blue-tint: #16304c;
    --comment-green: #6fae85;
    --navy: #0b1b2e;
    --navy-edge: #234a75;
    --shadow: 0 24px 60px -24px rgba(0, 0, 0, 0.7);
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* Language toggle: exactly one language renders at a time. */
html[data-lang="ja"] .en {
  display: none !important;
}
html[data-lang="en"] .ja {
  display: none !important;
}

a {
  color: var(--ts-blue);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  text-decoration-thickness: 2px;
}

:focus-visible {
  outline: 2px solid var(--ts-blue);
  outline-offset: 3px;
  border-radius: 2px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 12px;
  background: var(--navy);
  color: #fff;
  padding: 8px 14px;
  border-radius: 8px;
  font-family: var(--mono);
  font-size: 13px;
  z-index: 99;
}

.skip-link:focus {
  left: 12px;
}

.wrap {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------------------------------------------------------------- header */

.site-head {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--rule);
}

.site-head .wrap {
  display: flex;
  align-items: center;
  gap: 20px;
  height: 60px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.brand img {
  width: 28px;
  height: 28px;
  display: block;
}

.brand .comment-word {
  color: var(--faint);
  position: relative;
}

.brand .comment-word::after {
  content: "";
  position: absolute;
  left: -2%;
  right: -2%;
  top: 50%;
  height: 2px;
  background: var(--chip-red);
  border-radius: 2px;
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.25s ease;
}

.brand:hover .comment-word::after {
  transform: scaleX(1);
}

.head-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 18px;
  font-family: var(--mono);
  font-size: 13px;
}

.head-nav a {
  color: var(--slate);
  text-decoration: none;
}

.head-nav a:hover {
  color: var(--ts-blue);
}

.lang-switch {
  display: inline-flex;
  border: 1px solid var(--rule);
  border-radius: 999px;
  overflow: hidden;
}

.lang-switch button {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--slate);
  font-family: var(--mono);
  font-size: 12px;
  padding: 5px 12px;
  cursor: pointer;
}

.lang-switch button[aria-pressed="true"] {
  background: var(--navy);
  color: #fff;
}

/* ------------------------------------------------------------------ hero */

.hero {
  padding: 72px 0 84px;
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
  gap: 56px;
  align-items: center;
}

.eyebrow {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--comment-green);
  margin: 0 0 18px;
  letter-spacing: 0.01em;
}

h1 {
  font-family: var(--mono);
  font-weight: 700;
  font-size: clamp(28px, 4.2vw, 44px);
  line-height: 1.28;
  letter-spacing: -0.02em;
  margin: 0 0 22px;
}

/* Japanese headlines run wider per glyph: size down and only break where
   the markup says so, not inside a quoted phrase. */
html[data-lang="ja"] h1 {
  font-size: clamp(24px, 3.2vw, 35px);
  line-height: 1.5;
  letter-spacing: 0;
  word-break: keep-all;
}

h1 .accent {
  color: var(--scan-red);
}

.lede {
  color: var(--slate);
  font-size: 16.5px;
  max-width: 34em;
  margin: 0 0 30px;
}

.lede code,
p code,
li code,
td code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--ts-blue-tint);
  color: var(--ts-blue);
  padding: 1px 6px;
  border-radius: 6px;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.cmd {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--navy);
  border: 1px solid var(--navy-edge);
  color: var(--code-base);
  border-radius: 10px;
  padding: 12px 14px;
  font-family: var(--mono);
  font-size: 13.5px;
  max-width: 100%;
  overflow-x: auto;
}

.cmd .ps1 {
  color: var(--code-slate);
}

.cmd .flag,
.recipe .flag {
  color: var(--code-kw);
  white-space: nowrap;
}

.copy-btn {
  appearance: none;
  border: 1px solid var(--navy-edge);
  background: transparent;
  color: var(--code-slate);
  font-family: var(--mono);
  font-size: 11.5px;
  border-radius: 7px;
  padding: 4px 9px;
  cursor: pointer;
  flex: none;
}

.copy-btn:hover {
  color: var(--code-base);
  border-color: var(--code-slate);
}

.copy-btn.copied {
  color: #7ee2a8;
  border-color: #7ee2a8;
}

.hero-links {
  display: flex;
  gap: 18px;
  margin-top: 22px;
  font-family: var(--mono);
  font-size: 13.5px;
}

/* --------------------------------------------------------- hero demo panel */

.demo {
  margin: 0;
  background: var(--navy);
  border: 1px solid var(--navy-edge);
  border-radius: 14px;
  box-shadow: var(--shadow);
  overflow: hidden;
  position: relative;
}

.demo-bar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 11px 16px;
  border-bottom: 1px solid var(--navy-edge);
}

.demo-bar .dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--navy-edge);
}

.demo-title {
  margin-left: 8px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--code-slate);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.demo-code {
  margin: 0;
  padding: 18px 8px 14px 0;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.85;
  color: var(--code-base);
  overflow-x: auto;
}

.demo .line {
  display: flex;
  white-space: pre;
  padding: 0 16px 0 0;
}

.demo .ln {
  flex: none;
  width: 3.2em;
  text-align: right;
  padding-right: 1.1em;
  color: var(--code-slate);
  user-select: none;
}

.demo .kw {
  color: var(--code-kw);
}

.demo .str {
  color: var(--code-str);
}

.demo .cmt {
  color: var(--code-cmt);
}

.demo .cmt-noise {
  color: var(--code-cmt);
}

.demo .keep-chip {
  margin-left: 1.2em;
  font-size: 10.5px;
  border: 1px solid var(--code-kw);
  color: var(--code-kw);
  border-radius: 999px;
  padding: 0 8px;
  align-self: center;
  line-height: 1.7;
  opacity: 0;
}

.demo-status {
  font-family: var(--mono);
  font-size: 12.5px;
  color: #7ee2a8;
  padding: 12px 16px 14px;
  border-top: 1px solid var(--navy-edge);
  white-space: nowrap;
  overflow: hidden;
}

.demo-status .muted {
  color: var(--code-slate);
}

.scanline {
  position: absolute;
  left: 0;
  right: 0;
  top: 52px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--code-kw) 30%, var(--code-kw) 70%, transparent);
  opacity: 0;
  pointer-events: none;
}

/* Choreography: one 10s loop shared by every actor.
   ~12%   scanline enters and sweeps down
   16-22% narration lines flag red, directive flags blue
   36-44% red lines collapse
   48%    status line types in
   92%    everything resets for the next pass            */

@keyframes sweep {
  0%,
  8% {
    top: 52px;
    opacity: 0;
  }
  10% {
    opacity: 1;
    top: 52px;
  }
  26% {
    top: calc(100% - 46px);
    opacity: 1;
  }
  30%,
  100% {
    top: calc(100% - 46px);
    opacity: 0;
  }
}

.demo .scanline {
  animation: sweep 10s linear infinite;
}

@keyframes flag-del {
  0%,
  13% {
    background: transparent;
    line-height: 1.85;
    opacity: 1;
  }
  16%,
  36% {
    background: rgba(229, 72, 77, 0.18);
    box-shadow: inset 3px 0 0 var(--chip-red);
    line-height: 1.85;
    opacity: 1;
  }
  44%,
  88% {
    background: rgba(229, 72, 77, 0);
    line-height: 0;
    opacity: 0;
  }
  96%,
  100% {
    line-height: 1.85;
    opacity: 1;
  }
}

.demo .line.del {
  animation: flag-del 10s ease infinite;
  overflow: hidden;
}

.demo .line.del:nth-of-type(3) {
  animation-delay: 0.25s;
}

.demo .line.del:nth-of-type(4) {
  animation-delay: 0.5s;
}

@keyframes flag-keep {
  0%,
  19% {
    background: transparent;
  }
  22%,
  40% {
    background: rgba(106, 168, 232, 0.16);
    box-shadow: inset 3px 0 0 var(--code-kw);
  }
  48%,
  88% {
    background: rgba(106, 168, 232, 0.07);
    box-shadow: inset 3px 0 0 var(--code-kw);
  }
  96%,
  100% {
    background: transparent;
  }
}

.demo .line.keep {
  animation: flag-keep 10s ease infinite;
}

@keyframes chip-in {
  0%,
  21% {
    opacity: 0;
  }
  24%,
  90% {
    opacity: 1;
  }
  96%,
  100% {
    opacity: 0;
  }
}

.demo .keep-chip {
  animation: chip-in 10s ease infinite;
}

@keyframes status-type {
  0%,
  47% {
    width: 0;
    opacity: 0;
  }
  48% {
    opacity: 1;
    width: 0;
  }
  62%,
  91% {
    width: 39ch;
    opacity: 1;
  }
  96%,
  100% {
    width: 39ch;
    opacity: 0;
  }
}

.demo-status .typed {
  display: inline-block;
  overflow: hidden;
  vertical-align: bottom;
  animation: status-type 10s steps(39, end) infinite;
}

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

  .demo .scanline,
  .demo .line.del,
  .demo .line.keep,
  .demo .keep-chip,
  .demo-status .typed {
    animation: none;
  }

  /* Static tableau: flagged lines struck through, verdict visible. */
  .demo .line.del {
    background: rgba(229, 72, 77, 0.16);
    box-shadow: inset 3px 0 0 var(--chip-red);
  }

  .demo .line.del .code-text {
    text-decoration: line-through;
    text-decoration-color: var(--code-red);
    text-decoration-thickness: 1.5px;
  }

  .demo .line.keep {
    background: rgba(106, 168, 232, 0.12);
    box-shadow: inset 3px 0 0 var(--code-kw);
  }

  .demo .keep-chip {
    opacity: 1;
  }

  .demo-status .typed {
    width: auto;
    opacity: 1;
  }

  .scanline {
    display: none;
  }

  html.js .ticker-track {
    animation: none;
    flex-wrap: wrap;
    width: auto;
  }
}

/* -------------------------------------------------------------- sections */

section {
  padding: 40px 0;
}

section + section {
  border-top: 1px solid var(--rule);
}

.sec-eyebrow {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--comment-green);
  margin: 18px 0 10px;
}

h2 {
  font-family: var(--mono);
  font-weight: 600;
  font-size: clamp(21px, 2.6vw, 28px);
  letter-spacing: -0.015em;
  line-height: 1.4;
  margin: 0 0 14px;
}

.sec-intro {
  color: var(--slate);
  max-width: 46em;
  margin: 0 0 30px;
}

/* problem: the two comment species, side by side */

.species {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
  margin-top: 26px;
}

.specimen {
  border: 1px solid var(--rule);
  border-radius: 12px;
  background: var(--panel);
  overflow: hidden;
}

.specimen-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 16px;
  font-family: var(--mono);
  font-size: 12.5px;
  border-bottom: 1px solid var(--rule);
}

.specimen-head .verdict {
  flex: none;
  font-size: 10.5px;
  border-radius: 999px;
  padding: 1px 9px;
  border: 1px solid;
}

.specimen.good .verdict {
  color: var(--ts-blue);
  border-color: var(--ts-blue);
}

.specimen.bad .verdict {
  color: var(--scan-red);
  border-color: var(--scan-red);
}

.specimen-head .why {
  color: var(--slate);
}

.specimen pre {
  margin: 0;
  padding: 14px 16px;
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.8;
  overflow-x: auto;
}

.specimen .cmt {
  color: var(--comment-green);
}

.specimen.bad .cmt {
  color: var(--scan-red);
  background: var(--scan-red-tint);
}

.specimen .kw {
  color: var(--ts-blue);
}

.specimen .str {
  color: #9a6700;
}

@media (prefers-color-scheme: dark) {
  .specimen .str {
    color: #d8b263;
  }
}

.specimen-foot {
  padding: 10px 16px 12px;
  font-size: 13.5px;
  color: var(--slate);
  border-top: 1px dashed var(--rule);
}

/* features: entries named by their real flags */

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
  margin-top: 28px;
}

.feature {
  border: 1px solid var(--rule);
  border-radius: 12px;
  background: var(--panel);
  padding: 18px 18px 16px;
}

.feature .flag-chip {
  display: inline-block;
  font-family: var(--mono);
  font-size: 12.5px;
  font-weight: 600;
  color: var(--ts-blue);
  background: var(--ts-blue-tint);
  border-radius: 7px;
  padding: 3px 9px;
  margin-bottom: 10px;
}

.feature h3 {
  font-size: 15.5px;
  margin: 0 0 6px;
  font-weight: 650;
}

.feature p {
  margin: 0;
  font-size: 13.8px;
  color: var(--slate);
  line-height: 1.7;
}

/* safety: danger → guard ledger */

.guards {
  margin: 28px 0 0;
  border: 1px solid var(--rule);
  border-radius: 12px;
  background: var(--panel);
  overflow: hidden;
}

.guard {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 18px;
  padding: 14px 18px;
}

.guard + .guard {
  border-top: 1px solid var(--rule);
}

.guard .danger {
  color: var(--slate);
  font-size: 13.8px;
}

.guard .danger::before {
  content: "▲ ";
  color: var(--scan-red);
  font-size: 10px;
  vertical-align: 1px;
}

.guard .fix {
  font-size: 13.8px;
}

.guard .fix::before {
  content: "→ ";
  color: var(--ts-blue);
  font-family: var(--mono);
}

.proof-line {
  margin-top: 18px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--slate);
}

.proof-line strong {
  color: var(--comment-green);
  font-weight: 600;
}

/* directives ticker */

.ticker {
  margin-top: 26px;
  display: grid;
  gap: 10px;
  overflow: hidden;
}

html.js .ticker {
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 6%, #000 94%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 6%, #000 94%, transparent);
}

/* Without JS the chips simply wrap; with it they become a marquee. */
.ticker-track {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

html.js .ticker-track {
  flex-wrap: nowrap;
  width: max-content;
  animation: ticker-left 80s linear infinite;
}

html.js .ticker-track.reverse {
  animation-name: ticker-right;
}

.ticker:hover .ticker-track {
  animation-play-state: paused;
}

@keyframes ticker-left {
  from {
    transform: translateX(0);
  }
  to {
    transform: translateX(-50%);
  }
}

@keyframes ticker-right {
  from {
    transform: translateX(-50%);
  }
  to {
    transform: translateX(0);
  }
}

.ticker .chip {
  flex: none;
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--slate);
  border: 1px solid var(--rule);
  background: var(--panel);
  border-radius: 999px;
  padding: 4px 13px;
  white-space: nowrap;
}

.parser-notes {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.parser-notes li {
  border-left: 3px solid var(--ts-blue);
  padding-left: 14px;
  font-size: 13.8px;
  color: var(--slate);
}

.parser-notes .rule-name {
  display: block;
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--ink);
  margin-bottom: 4px;
}

/* usage */

.recipes {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 26px;
}

.recipe {
  background: var(--navy);
  border: 1px solid var(--navy-edge);
  border-radius: 12px;
  padding: 14px 16px;
  overflow-x: auto;
}

.recipe .recipe-note {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--code-cmt);
  margin: 0 0 6px;
}

.recipe .recipe-cmd {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--mono);
  font-size: 13.5px;
  color: var(--code-base);
  white-space: nowrap;
}

.recipe .recipe-cmd .grow {
  flex: 1 1 auto;
}

.steps {
  counter-reset: step;
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}

.steps li {
  counter-increment: step;
  border-top: 3px solid var(--navy);
  padding-top: 12px;
  font-size: 13.8px;
  color: var(--slate);
}

.steps li::before {
  content: counter(step, decimal-leading-zero);
  display: block;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ts-blue);
  margin-bottom: 6px;
}

.steps li strong {
  display: block;
  color: var(--ink);
  font-size: 14.5px;
  margin-bottom: 4px;
}

.exit-codes {
  margin-top: 26px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--slate);
}

.exit-codes b {
  color: var(--ink);
  font-weight: 600;
}

/* footer */

.site-foot {
  border-top: 1px solid var(--rule);
  margin-top: 40px;
  padding: 44px 0 56px;
}

.site-foot .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 28px;
  align-items: center;
}

.site-foot img {
  height: 40px;
  display: block;
}

.foot-thesis {
  font-family: var(--mono);
  font-size: 13.5px;
  color: var(--comment-green);
  margin: 0;
}

.foot-links {
  margin-left: auto;
  display: flex;
  gap: 18px;
  font-family: var(--mono);
  font-size: 13px;
}

.foot-meta {
  width: 100%;
  color: var(--faint);
  font-size: 12.5px;
  font-family: var(--mono);
}

/* ------------------------------------------------------------ responsive */

@media (max-width: 960px) {
  .hero {
    grid-template-columns: minmax(0, 1fr);
    gap: 40px;
    padding: 48px 0 56px;
  }

  .feature-grid,
  .parser-notes,
  .steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .head-nav .gh-only {
    display: none;
  }
}

@media (max-width: 620px) {
  .feature-grid,
  .parser-notes,
  .steps {
    grid-template-columns: minmax(0, 1fr);
  }

  .guard {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
  }

  .demo-code {
    font-size: 11.5px;
  }

  .site-foot .foot-links {
    margin-left: 0;
  }
}