:root {
  color-scheme: light;
  --paper: #f2eadc;
  --paper-light: #fff9ed;
  --paper-ink: #17120d;
  --muted: #64584c;
  --prose-ink: #42382f;
  --red: #c64332;
  --green: #0b6b50;
  --blue: #154f83;
  --ochre: #c99022;
  --line: rgba(23, 18, 13, .2);
  --line-strong: #17120d;
  --panel: #fff7e8;
  --surface: #fff;
  --stripe: #fff;
  --ink-inverse: #fff;
  --accent-ink: #fff;
  --inverse-muted: rgba(255, 255, 255, .78);
  --grid-line: rgba(23, 18, 13, .045);
  --footer-bg: #e7dbc8;
  --notice-bg: #fff1e9;
  --notice-ink: #4a241d;
  --table-heading-bg: rgba(11, 107, 80, .12);
  --code-bg: #17120d;
  --code-ink: #f7f2e8;
  --code-keyword: #f0b24a;
  --code-function: #8dd9c7;
  --code-string: #f49a85;
  --code-number: #9bc7ff;
  --shadow: var(--paper-ink);
  --max: 1180px;
  --font: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans TC", "Helvetica Neue", Arial, sans-serif;
  --serif: "Noto Serif TC", "Songti TC", "PMingLiU", Georgia, "Times New Roman", serif;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --paper: #11100e;
  --paper-light: #1a1714;
  --paper-ink: #f6efe3;
  --muted: #beb2a4;
  --prose-ink: #e5d8ca;
  --red: #ff8f79;
  --green: #66d3ac;
  --blue: #8bbff5;
  --ochre: #f2c261;
  --line: rgba(246, 239, 227, .24);
  --line-strong: #f6efe3;
  --panel: #211d18;
  --surface: #171411;
  --stripe: #f6efe3;
  --ink-inverse: #11100e;
  --accent-ink: #11100e;
  --inverse-muted: rgba(17, 16, 14, .72);
  --grid-line: rgba(246, 239, 227, .055);
  --footer-bg: #181512;
  --notice-bg: #2a1d18;
  --notice-ink: #ffd1c4;
  --table-heading-bg: rgba(102, 211, 172, .16);
  --code-bg: #050505;
  --code-ink: #f7f2e8;
  --code-keyword: #ffd36f;
  --code-function: #9ce7d2;
  --code-string: #ffa694;
  --code-number: #a8cdfa;
  --shadow: #050505;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--paper-ink);
  font-family: var(--font);
  line-height: 1.58;
  background-color: var(--paper);
  background-image:
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px),
    linear-gradient(180deg, var(--grid-line) 1px, transparent 1px),
    linear-gradient(180deg, var(--paper-light), var(--paper));
  background-size: 28px 28px, 28px 28px, 100% 100%;
}

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

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

/* WebP <picture> wrappers stay layout-transparent so the inner <img> keeps
   its own sizing rules (.hero-logo, .brand-mark, .crest-img). */
picture {
  display: contents;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 1rem;
  z-index: 100;
  border: 2px solid var(--line-strong);
  border-radius: 4px;
  background: var(--paper-ink);
  color: var(--ink-inverse);
  padding: .7rem 1rem;
}

.skip-link:focus {
  left: 1rem;
}

.section-pad {
  width: min(var(--max), calc(100% - 2rem));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 2px solid var(--line-strong);
  background: var(--paper-light);
}

.nav-wrap {
  width: min(1280px, calc(100% - 2rem));
  min-height: 72px;
  margin: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: .65rem;
  font-family: var(--serif);
  font-size: 1.05rem;
  font-weight: 900;
}

.brand-mark {
  width: 42px;
  height: 42px;
  object-fit: cover;
  border: 2px solid var(--line-strong);
  border-radius: 4px;
  background: var(--surface);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: .25rem;
}

.site-nav a {
  border: 1px solid transparent;
  border-radius: 4px;
  color: var(--muted);
  font-size: .92rem;
  font-weight: 750;
  padding: .55rem .7rem;
}

.site-nav a:hover {
  border-color: var(--line-strong);
  background: var(--surface);
  color: var(--paper-ink);
}

.nav-cta {
  border-color: var(--line-strong) !important;
  background: var(--paper-ink) !important;
  color: var(--ink-inverse) !important;
}

.icon-discord,
.icon-hf,
.icon-github {
  width: 20px;
  height: 20px;
  flex: 0 0 auto;
}

.site-nav a.nav-social {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
}

.nav-social .label {
  display: none;
}

@media (max-width: 980px) {
  .nav-social .label {
    display: inline;
  }
}

.nav-toggle {
  display: none;
  border: 2px solid var(--line-strong);
  border-radius: 4px;
  background: var(--surface);
  color: var(--paper-ink);
  font-weight: 800;
  padding: .65rem .95rem;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(300px, .85fr);
  gap: 2rem;
  align-items: end;
  padding: 4rem 0 3.5rem;
}

.hero > * {
  min-width: 0;
}

.eyebrow {
  width: fit-content;
  margin: 0 0 1rem;
  border-left: 8px solid var(--green);
  color: var(--paper-ink);
  font-size: .78rem;
  font-weight: 900;
  padding-left: .65rem;
  text-transform: uppercase;
}

.hero h1,
.page-hero h1,
.post-hero h1 {
  margin: .1rem 0 1.25rem;
  font-family: var(--serif);
  font-size: 5.25rem;
  font-weight: 900;
  line-height: .92;
  max-width: 100%;
  overflow-wrap: anywhere;
  word-break: normal;
  line-break: strict;
}

.hero h1 {
  font-size: clamp(3.65rem, 5.8vw, 4.7rem);
}

.hero h1 span {
  display: block;
  max-width: 100%;
}

.lede {
  max-width: 760px;
  margin: 0;
  color: var(--muted);
  font-size: 1.28rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .65rem;
  margin-top: 2rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  border: 2px solid var(--line-strong);
  border-radius: 4px;
  background: var(--surface);
  color: var(--paper-ink);
  font-weight: 900;
  padding: .8rem 1rem;
}

.btn:hover {
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0 var(--shadow);
}

.btn.primary {
  background: var(--paper-ink);
  color: var(--ink-inverse);
}

.btn.green {
  background: var(--green);
  color: var(--accent-ink);
}

.btn.red {
  background: var(--red);
  color: var(--accent-ink);
}

.hero-card {
  position: relative;
  width: 100%;
  min-width: 0;
  border: 2px solid var(--line-strong);
  border-radius: 4px;
  background: var(--panel);
  padding: 1rem;
}

.hero-card::before {
  content: "";
  display: block;
  height: 34px;
  margin: -1rem -1rem 1rem;
  border-bottom: 2px solid var(--line-strong);
  background:
    linear-gradient(90deg, var(--red) 0 28%, var(--green) 28% 62%, var(--blue) 62% 100%);
}

.hero-logo {
  display: block;
  width: 100%;
  max-height: 390px;
  margin: auto;
  object-fit: contain;
}

.metric-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: .5rem;
  margin-top: 1rem;
}

.metric {
  min-width: 0;
  border: 2px solid var(--line-strong);
  border-radius: 4px;
  background: var(--surface);
  padding: .8rem;
}

.metric strong {
  display: block;
  font-family: var(--serif);
  font-size: 1.1rem;
  letter-spacing: -.03em;
}

.metric span {
  color: var(--muted);
  font-size: .82rem;
  overflow-wrap: anywhere;
}

.section {
  padding: 4.5rem 0;
  border-top: 2px solid var(--line-strong);
}

.section-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 420px);
  gap: 2rem;
  align-items: end;
  margin-bottom: 1rem;
}

.section-head h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: 3.6rem;
  line-height: 1;
}

.section-head p {
  margin: 0;
  color: var(--muted);
  font-size: 1rem;
}

.model-grid {
  display: grid;
  grid-template-columns: 1.45fr .85fr 1fr;
  gap: .75rem;
  align-items: stretch;
}

.model-card,
.policy-card,
.post-card,
.feature-card,
.timeline-card {
  border: 2px solid var(--line-strong);
  border-radius: 4px;
  background: var(--panel);
  box-shadow: none;
  padding: 1rem;
}

.model-card {
  min-height: 300px;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  overflow: hidden;
}

.model-card::after {
  content: "";
  position: absolute;
  right: 0;
  top: 0;
  width: 16px;
  height: 100%;
  background: var(--accent);
}

.tag {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--line-strong);
  border-radius: 3px;
  background: var(--surface);
  color: var(--paper-ink);
  font-size: .72rem;
  font-weight: 900;
  padding: .28rem .45rem;
}

.model-card h3,
.policy-card h3,
.feature-card h3 {
  margin: 1rem 0 .6rem;
  font-family: var(--serif);
  font-size: 1.85rem;
  line-height: 1.05;
}

.model-card p,
.policy-card p,
.feature-card p {
  color: var(--muted);
}

.directory-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: .75rem;
  align-items: stretch;
}

.directory-card {
  min-width: 0;
  min-height: 245px;
  display: flex;
  flex-direction: column;
  border: 2px solid var(--line-strong);
  border-radius: 4px;
  background: var(--panel);
  padding: 1rem;
}

.directory-card:nth-child(1) {
  border-top-width: 10px;
  border-top-color: var(--green);
}

.directory-card:nth-child(2) {
  border-top-width: 10px;
  border-top-color: var(--red);
}

.directory-card:nth-child(3) {
  border-top-width: 10px;
  border-top-color: var(--blue);
}

.directory-card:nth-child(4) {
  border-top-width: 10px;
  border-top-color: var(--ochre);
}

.directory-card h3 {
  margin: 1.1rem 0 .65rem;
  font-family: var(--serif);
  font-size: 1.65rem;
  line-height: 1.08;
}

.directory-card p {
  margin: 0;
  color: var(--muted);
}

.directory-card:hover {
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0 var(--shadow);
}

.woven-band {
  height: 18px;
  margin-top: 1rem;
  border: 1px solid var(--line-strong);
  background:
    linear-gradient(90deg, var(--red) 0 18%, var(--stripe) 18% 22%, var(--green) 22% 58%, var(--stripe) 58% 62%, var(--blue) 62% 100%);
}

.split {
  display: grid;
  grid-template-columns: .95fr 1.05fr;
  gap: .75rem;
  align-items: stretch;
}

.callout {
  position: relative;
  overflow: hidden;
  border: 2px solid var(--line-strong);
  border-radius: 4px;
  background: var(--paper-ink);
  color: var(--ink-inverse);
  padding: 1.5rem;
}

.callout::before {
  content: "";
  display: block;
  width: 84px;
  height: 84px;
  margin-bottom: 1rem;
  background:
    linear-gradient(90deg, var(--red) 0 33%, var(--green) 33% 66%, var(--blue) 66% 100%);
  border: 2px solid var(--ink-inverse);
}

.callout h2 {
  margin: 0 0 1rem;
  font-family: var(--serif);
  font-size: 4rem;
  line-height: 1;
  overflow-wrap: anywhere;
}

.callout p {
  max-width: 650px;
  color: var(--inverse-muted);
}

.callout .eyebrow {
  border-color: var(--red);
  color: var(--ink-inverse);
}

.check-list {
  display: grid;
  gap: .55rem;
  margin: 0;
  padding: 0;
}

.check-list li {
  position: relative;
  list-style: none;
  border: 2px solid var(--line-strong);
  border-radius: 4px;
  background: var(--surface);
  padding: 1rem 1rem 1rem 3.35rem;
}

.check-list li::before {
  content: "✓";
  position: absolute;
  left: .8rem;
  top: .85rem;
  display: grid;
  place-items: center;
  width: 1.6rem;
  height: 1.6rem;
  border: 2px solid var(--line-strong);
  background: var(--green);
  color: var(--accent-ink);
  font-weight: 900;
}

.release-panel {
  display: grid;
  grid-template-columns: minmax(0, .9fr) minmax(320px, 1.1fr);
  gap: .75rem;
  align-items: stretch;
}

.release-panel > div:first-child {
  border: 2px solid var(--line-strong);
  border-radius: 4px;
  background: var(--paper-ink);
  color: var(--ink-inverse);
  padding: 1.5rem;
}

.release-panel h2 {
  margin: 0 0 1rem;
  font-family: var(--serif);
  font-size: 3.5rem;
  line-height: 1;
}

.release-panel p {
  color: var(--inverse-muted);
}

.release-list {
  display: grid;
  gap: .75rem;
}

.release-list a {
  display: grid;
  gap: .35rem;
  min-width: 0;
  border: 2px solid var(--line-strong);
  border-radius: 4px;
  background: var(--surface);
  padding: 1rem;
}

.release-list a:hover {
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0 var(--shadow);
}

.release-list strong {
  font-family: var(--serif);
  font-size: 1.35rem;
  line-height: 1.08;
}

.release-list span {
  color: var(--muted);
}

.article-strip {
  display: grid;
  grid-template-columns: 1.35fr .8fr 1fr;
  gap: .75rem;
  align-items: stretch;
}

.post-card {
  display: flex;
  flex-direction: column;
  min-height: 220px;
  height: 100%;
}

.post-card:hover,
.policy-card:hover {
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0 var(--shadow);
}

.post-card .meta {
  color: var(--muted);
  font-size: .84rem;
  margin-bottom: .8rem;
}

.post-card h3 {
  margin: 0 0 .8rem;
  font-family: var(--serif);
  font-size: 1.55rem;
  line-height: 1.08;
}

.post-card p {
  margin: 0 0 auto;
  color: var(--muted);
}

.page-hero,
.post-hero {
  padding: 4rem 0 2rem;
}

.page-hero h1 {
  font-size: 4.8rem;
}

.post-hero h1 {
  font-size: 4.6rem;
}

.soft-panel {
  border: 2px solid var(--line-strong);
  border-radius: 4px;
  background: var(--panel);
  box-shadow: none;
  padding: 1.4rem;
}

.prose {
  max-width: 860px;
}

.prose > :first-child {
  margin-top: 0;
}

.prose h2 {
  margin-top: 2.2rem;
  font-family: var(--serif);
  font-size: 2rem;
  line-height: 1.08;
}

.prose h3 {
  margin-top: 1.8rem;
  font-size: 1.35rem;
}

.prose p,
.prose li {
  color: var(--prose-ink);
}

.prose a {
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.prose code {
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--surface);
  padding: .1em .35em;
}

.prose pre {
  overflow: auto;
  border: 2px solid var(--line-strong);
  border-radius: 4px;
  background: var(--code-bg);
  color: var(--code-ink);
  padding: 1rem;
}

.prose pre code {
  display: block;
  min-width: max-content;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: inherit;
  padding: 0;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: .95rem;
  line-height: 1.65;
  white-space: pre;
}

.prose .highlight {
  margin: 1.5rem 0;
}

.prose .highlight pre {
  margin: 0;
}

.prose .highlight span {
  background: transparent;
}

.prose .highlight .k,
.prose .highlight .ow {
  color: var(--code-keyword);
}

.prose .highlight .nf {
  color: var(--code-function);
}

.prose .highlight .n,
.prose .highlight .p,
.prose .highlight .o {
  color: var(--code-ink);
}

.prose .highlight .s,
.prose .highlight .s1,
.prose .highlight .s2 {
  color: var(--code-string);
}

.prose .highlight .mi,
.prose .highlight .mf {
  color: var(--code-number);
}

/* ===== Research-article prose ===== */
.post-meta {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  align-items: baseline;
  margin-top: 1.1rem;
  color: var(--muted);
  font-size: .9rem;
  letter-spacing: .01em;
}

.post-meta time {
  font-weight: 700;
  color: var(--paper-ink);
}

.prose p,
.prose li {
  color: var(--prose-ink);
  line-height: 1.9;
}

.prose p {
  margin: 1.15rem 0;
}

.prose li {
  margin: .35rem 0;
}

.prose li::marker {
  color: var(--muted);
}

.prose strong {
  color: var(--paper-ink);
  font-weight: 700;
}

.prose h2 {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 2px solid var(--line-strong);
}

.prose > h2:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.post-abstract {
  margin: 1.8rem 0 .5rem;
  border: 2px solid var(--line-strong);
  border-left-width: 10px;
  border-radius: 4px;
  background: var(--panel);
  padding: 1.4rem 1.6rem;
}

.post-abstract > :first-child {
  margin-top: 0;
}

.post-abstract > :last-child {
  margin-bottom: 0;
}

.post-abstract p {
  font-size: 1.05rem;
  line-height: 1.85;
}

.post-abstract strong:first-child {
  font-family: var(--serif);
  letter-spacing: .04em;
}

/* ===== Inline chart figures ===== */
.post-figure {
  margin: 2rem 0;
  padding: 1.4rem 1.4rem 1.1rem;
  border: 2px solid var(--line-strong);
  border-radius: 4px;
  background: var(--panel);
}

.post-figure svg {
  display: block;
  width: 100%;
  height: auto;
  font-family: inherit;
}

.post-figure figcaption {
  margin-top: 1rem;
  padding-top: .85rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: .85rem;
  line-height: 1.65;
}

.post-figure figcaption b {
  color: var(--paper-ink);
  font-weight: 700;
}

.prose table {
  width: 100%;
  margin: 1.7rem 0;
  border: 2px solid var(--line-strong);
  border-collapse: collapse;
  border-radius: 4px;
  overflow: hidden;
  font-size: .9rem;
  line-height: 1.5;
}

.prose thead th {
  background: var(--table-heading-bg);
  font-family: var(--serif);
  font-weight: 700;
  white-space: nowrap;
}

.prose th,
.prose td {
  border-bottom: 1px solid var(--line);
  padding: .55rem .8rem;
  text-align: left;
  vertical-align: top;
}

.prose tbody tr:last-child td {
  border-bottom: 0;
}

.prose td code,
.prose th code {
  white-space: nowrap;
}

/* Per-post bilingual body: show only the active language. */
.post-lang-en {
  display: none;
}

html[data-lang="en"] .post-lang-zh {
  display: none;
}

html[data-lang="en"] .post-lang-en {
  display: block;
}

.post-lang-zh > :first-child,
.post-lang-en > :first-child {
  margin-top: 0;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: .75rem;
}

.field-card {
  border: 2px solid var(--line-strong);
  border-radius: 4px;
  background: var(--surface);
  padding: 1rem;
}

.field-card strong {
  display: block;
  margin-bottom: .35rem;
}

.blog-tools {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
  margin: 1.5rem 0;
}

.blog-tools input,
.blog-tools select {
  min-width: 220px;
  border: 2px solid var(--line-strong);
  border-radius: 4px;
  background: var(--surface);
  color: var(--paper-ink);
  padding: .8rem 1rem;
}

.blog-empty {
  text-align: center;
  padding: 2.8rem 1.6rem;
}

.blog-empty .weave-rule {
  max-width: 220px;
  margin: 0 auto 1.8rem;
}

.blog-empty h2 {
  margin: 0 0 .8rem;
  font-family: var(--serif);
  font-size: clamp(2rem, 4vw, 2.8rem);
  line-height: 1.1;
}

.blog-empty p {
  max-width: 52ch;
  margin: 0 auto;
  color: var(--muted);
}

.timeline {
  display: grid;
  gap: .75rem;
}

.timeline-card {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 1rem;
}

.timeline-card time {
  color: var(--green);
  font-family: var(--serif);
  font-size: 1.3rem;
  font-weight: 900;
}

.site-footer {
  margin-top: 4rem;
  padding: 4rem 2rem 2.25rem;
  border-top: 2px solid var(--line-strong);
  background: var(--footer-bg);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.footer-brand-block p {
  max-width: 60ch;
}

.footer-grid h3 {
  margin: .2rem 0 1rem;
  font-family: var(--serif);
}

.footer-grid a {
  display: block;
  color: var(--muted);
  padding: .25rem 0;
}

.footer-brand {
  display: flex !important;
  align-items: center;
  gap: .55rem;
  color: var(--paper-ink) !important;
  font-family: var(--serif);
  font-weight: 900;
}

.footer-brand img {
  width: 32px;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 2.6rem;
  border-top: 2px solid var(--line-strong);
  color: var(--muted);
  font-size: .85rem;
  padding-top: 1.6rem;
}

.notice {
  border: 2px solid var(--red);
  border-radius: 4px;
  background: var(--notice-bg);
  color: var(--notice-ink);
  padding: 1rem;
}

.data-table {
  width: 100%;
  overflow: hidden;
  border: 2px solid var(--line-strong);
  border-collapse: separate;
  border-spacing: 0;
  border-radius: 4px;
}

.data-table th,
.data-table td {
  border-bottom: 1px solid var(--line);
  padding: 1rem;
  text-align: left;
  vertical-align: top;
}

.data-table tr:last-child td {
  border-bottom: 0;
}

.data-table th {
  background: var(--table-heading-bg);
}

@media (max-width: 1240px) {
  .hero {
    grid-template-columns: minmax(0, 1.3fr) minmax(280px, .75fr);
    gap: 1.35rem;
  }

  .hero h1 {
    font-size: clamp(3.45rem, 5.6vw, 4.35rem);
  }

  .site-nav a {
    padding-inline: .55rem;
  }
}

@media (min-width: 981px) {
  html[data-lang="zh-Hant"] .hero h1 {
    word-break: normal;
    line-break: loose;
  }
}

@media (max-width: 980px) {
  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    top: 72px;
    left: 1rem;
    right: 1rem;
    display: none;
    flex-direction: column;
    align-items: stretch;
    border: 2px solid var(--line-strong);
    border-radius: 4px;
    background: var(--paper-light);
    padding: 1rem;
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a {
    width: 100%;
  }

  .hero {
    grid-template-columns: 1fr;
    align-items: start;
    gap: 1.35rem;
  }

  .hero-card {
    max-width: 720px;
    margin-inline: auto;
  }
}

@media (max-width: 760px) {
  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    top: 72px;
    left: 1rem;
    right: 1rem;
    display: none;
    flex-direction: column;
    align-items: stretch;
    border: 2px solid var(--line-strong);
    border-radius: 4px;
    background: var(--paper-light);
    padding: 1rem;
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a {
    width: 100%;
  }

  .hero,
  .split,
  .release-panel,
  .footer-grid,
  .section-head {
    grid-template-columns: 1fr;
  }

  .model-grid,
  .article-strip,
  .directory-grid,
  .form-grid {
    grid-template-columns: 1fr;
  }

  .model-card:nth-child(2),
  .model-card:nth-child(3),
  .post-card:nth-child(2),
  .post-card:nth-child(3) {
    transform: none;
  }

  .metric-row {
    grid-template-columns: 1fr;
  }

  .timeline-card {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 2.5rem;
  }

  .hero-card {
    order: -1;
  }

  .hero h1 {
    font-size: 3.8rem;
  }

  .page-hero h1,
  .post-hero h1 {
    font-size: 3.1rem;
  }

  .section-head h2,
  .callout h2,
  .release-panel h2 {
    font-size: 2.8rem;
  }

  .footer-bottom {
    display: block;
  }

  .site-footer {
    padding: 2.8rem 1.1rem 1.8rem;
  }
}

@media (max-width: 640px) {
  .prose pre,
  .prose pre code {
    white-space: pre-wrap;
    overflow-wrap: anywhere;
  }

  .prose pre code {
    min-width: 0;
  }

  .prose table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }
}

@media (max-width: 520px) {
  .hero h1 {
    font-size: 3rem;
  }

  .page-hero h1,
  .post-hero h1 {
    font-size: 2.55rem;
  }

  .lede {
    font-size: 1.08rem;
  }
}

/* ============================================================
   Model family identity + brand narrative system
   Added for the OpenFormosa philosophy / UI-UX pass.
   Species tokens derive from the four brand colors so they
   adapt to light/dark automatically.
   ============================================================ */
:root {
  --barbet: var(--green);
  --blackbear: var(--red);
  --bluemagpie: var(--blue);
  --sikadeer: var(--ochre);
  --weave: repeating-linear-gradient(90deg,
    var(--red) 0 7%, var(--paper-light) 7% 9%,
    var(--green) 9% 23%, var(--paper-light) 23% 25%,
    var(--blue) 25% 39%, var(--paper-light) 39% 41%,
    var(--ochre) 41% 48%, var(--paper-light) 48% 50%);
}

/* Smooth, restrained motion on interactive cards. */
.btn,
.directory-card,
.post-card,
.policy-card,
.release-list a,
.family-card,
.scenario-card,
.problem-card,
.promise,
.spec-row {
  transition: transform .16s ease, box-shadow .16s ease, border-color .16s ease;
}

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

/* Reveal-on-scroll: opt-in via .reveal, toggled by main.js.
   Gated on html.js so content is always visible without JavaScript. */
html.js .reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .5s ease, transform .5s ease;
}

html.js .reveal.is-in {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }

  html.js .reveal {
    opacity: 1;
    transform: none;
  }
}

/* Woven divider — refined茄芷袋 stripe. */
.weave-rule {
  height: 12px;
  border: 2px solid var(--line-strong);
  border-radius: 4px;
  background: var(--weave);
}

/* Eyebrow accent colour helpers. */
.eyebrow.red { border-color: var(--red); }
.eyebrow.blue { border-color: var(--blue); }
.eyebrow.ochre { border-color: var(--ochre); }

/* ---- Four-part promise: 聽 / 說 / 讀 / 記 ---- */
.promise-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: .75rem;
}

.promise {
  min-width: 0;
  border: 2px solid var(--line-strong);
  border-top-width: 10px;
  border-top-color: var(--accent, var(--green));
  border-radius: 4px;
  background: var(--surface);
  padding: 1.15rem;
}

.promise strong {
  display: block;
  font-family: var(--serif);
  font-size: 1.85rem;
  line-height: 1.05;
}

.promise .role {
  display: inline-block;
  margin: .55rem 0 .4rem;
  color: var(--accent, var(--green));
  font-size: .76rem;
  font-weight: 900;
  letter-spacing: .04em;
  text-transform: uppercase;
}

.promise span.gloss {
  display: block;
  color: var(--muted);
  font-size: .92rem;
}

/* ---- Mission band ---- */
.mission {
  position: relative;
  overflow: hidden;
  border: 2px solid var(--line-strong);
  border-radius: 4px;
  background: var(--paper-ink);
  color: var(--ink-inverse);
  padding: 2.6rem 2.2rem;
}

.mission::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 12px;
  background: var(--weave);
  border-bottom: 2px solid var(--ink-inverse);
}

.mission .eyebrow {
  margin-top: .6rem;
  border-color: var(--red);
  color: var(--ink-inverse);
}

.mission h2 {
  margin: 0 0 1rem;
  max-width: 22ch;
  font-family: var(--serif);
  font-size: clamp(2.2rem, 4.4vw, 3.4rem);
  line-height: 1.05;
}

.mission p {
  max-width: 70ch;
  margin: 0;
  color: var(--inverse-muted);
  font-size: 1.1rem;
}

/* ---- Problems we solve ---- */
.problem-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: .75rem;
}

.problem-card {
  position: relative;
  min-width: 0;
  border: 2px solid var(--line-strong);
  border-left-width: 8px;
  border-left-color: var(--red);
  border-radius: 4px;
  background: var(--surface);
  padding: 1.1rem 1.1rem 1.2rem;
}

.problem-card .num {
  display: block;
  margin-bottom: .35rem;
  color: var(--red);
  font-family: var(--serif);
  font-size: 1.5rem;
  font-weight: 900;
}

.problem-card h3 {
  margin: 0 0 .5rem;
  font-family: var(--serif);
  font-size: 1.3rem;
  line-height: 1.12;
}

.problem-card p {
  margin: 0;
  color: var(--muted);
  font-size: .95rem;
}

/* ---- Model family (species) ---- */
.family-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: .75rem;
}

.family-card {
  display: flex;
  flex-direction: column;
  gap: .65rem;
  min-width: 0;
  border: 2px solid var(--line-strong);
  border-top-width: 10px;
  border-top-color: var(--accent, var(--green));
  border-radius: 4px;
  background: var(--panel);
  padding: 1.15rem;
}

.family-card .crest,
.family-card .crest-img {
  width: 96px;
  height: 96px;
  flex: 0 0 auto;
  color: var(--accent, var(--green));
}

/* Illustrated jia-zhi-bag model icons. */
.crest-img {
  display: block;
  border: 2px solid var(--line-strong);
  border-radius: 8px;
  background: #faf5ea;
  object-fit: cover;
}

/* Crest internals — accent tile, ink border, themed motif. */
.crest {
  display: block;
  color: var(--accent, var(--green));
}

.crest .tile {
  fill: currentColor;
  stroke: var(--line-strong);
  stroke-width: 2.5;
}

.crest .mark {
  fill: none;
  stroke: var(--accent-ink);
}

.crest .mark-fill {
  fill: var(--accent-ink);
  stroke: none;
}

.family-card .role {
  width: fit-content;
  border: 1px solid var(--line-strong);
  border-radius: 3px;
  background: var(--surface);
  color: var(--paper-ink);
  font-size: .72rem;
  font-weight: 900;
  padding: .26rem .45rem;
}

.family-card h3 {
  margin: .1rem 0 0;
  font-family: var(--serif);
  font-size: 1.5rem;
  line-height: 1.05;
}

.family-card .latin {
  margin: -.2rem 0 .1rem;
  color: var(--accent, var(--green));
  font-size: .82rem;
  font-weight: 800;
}

.family-card p {
  margin: 0;
  color: var(--muted);
  font-size: .94rem;
}

/* ---- Application scenarios ---- */
.scenario-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: .7rem;
}

.scenario-card {
  min-width: 0;
  border: 2px solid var(--line-strong);
  border-radius: 4px;
  background: var(--surface);
  padding: 1.05rem;
}

.scenario-card .ico {
  width: 34px;
  height: 34px;
  margin-bottom: .7rem;
  color: var(--green);
}

.scenario-card h3 {
  margin: 0 0 .55rem;
  font-family: var(--serif);
  font-size: 1.18rem;
  line-height: 1.1;
}

.scenario-card ul {
  margin: 0;
  padding-left: 1.05rem;
  color: var(--muted);
  font-size: .9rem;
}

.scenario-card li {
  margin-bottom: .2rem;
}

/* ---- Technical route / spec rows ---- */
.spec-list {
  display: grid;
  gap: .65rem;
}

.spec-row {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 1.2rem;
  align-items: start;
  border: 2px solid var(--line-strong);
  border-radius: 4px;
  background: var(--surface);
  padding: 1.15rem 1.2rem;
}

.spec-row .spec-key {
  font-family: var(--serif);
  font-size: 1.3rem;
  line-height: 1.1;
}

.spec-key .crest-img {
  width: 84px;
  height: 84px;
  margin-bottom: .75rem;
}

.spec-row .spec-key .spec-name {
  display: block;
}

.spec-row .spec-key .spec-tag {
  display: block;
  margin-top: .25rem;
  color: var(--green);
  font-family: var(--font);
  font-size: .78rem;
  font-weight: 900;
  letter-spacing: .03em;
  text-transform: uppercase;
}

.spec-row p {
  margin: 0;
  color: var(--muted);
}

/* ---- Why the jia-zhi bag: symbol grid ---- */
.symbol-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: .7rem;
}

.symbol-card {
  min-width: 0;
  border: 2px solid var(--line-strong);
  border-radius: 4px;
  background: var(--surface);
  padding: 1.1rem;
}

.symbol-card .key {
  display: block;
  margin-bottom: .35rem;
  font-family: var(--serif);
  font-size: 1.25rem;
}

.symbol-card p {
  margin: 0;
  color: var(--muted);
  font-size: .94rem;
}

/* ---- Manifesto ---- */
.manifesto {
  position: relative;
  overflow: hidden;
  border: 2px solid var(--line-strong);
  border-radius: 4px;
  background: var(--panel);
  padding: 2.4rem 2.2rem;
}

.manifesto .weave-rule {
  margin-bottom: 1.6rem;
}

.manifesto .quote {
  margin: 0 0 1.1rem;
  max-width: 62ch;
  font-family: var(--serif);
  font-size: clamp(1.5rem, 2.6vw, 2.05rem);
  line-height: 1.32;
}

.manifesto .quote.en {
  color: var(--muted);
  font-size: clamp(1.05rem, 1.8vw, 1.25rem);
  line-height: 1.5;
}

.manifesto .sig {
  margin: 1.4rem 0 0;
  color: var(--green);
  font-weight: 900;
  letter-spacing: .02em;
}

/* ---- Responsive for new components ---- */
@media (max-width: 980px) {
  .promise-grid,
  .family-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .mission {
    padding: 2rem 1.4rem;
  }
}

@media (max-width: 620px) {
  .promise-grid,
  .family-grid {
    grid-template-columns: 1fr;
  }

  .spec-row {
    grid-template-columns: 1fr;
    gap: .5rem;
  }

  .manifesto,
  .mission {
    padding: 1.6rem 1.2rem;
  }
}

/* ===== Inline TTS listening demo (blog posts) ===== */
.tts-demo {
  margin: 2rem 0;
  border: 2px solid var(--line-strong);
  border-radius: 4px;
  background: var(--panel);
  overflow: hidden;
}

.tts-demo__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .35rem .8rem;
  padding: 1rem 1.3rem;
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}

.tts-demo__title {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--paper-ink);
}

.tts-demo__hint {
  color: var(--muted);
  font-size: .82rem;
  line-height: 1.5;
}

.tts-demo__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.tts-card {
  display: flex;
  gap: .9rem;
  padding: 1.05rem 1.3rem;
  border-top: 1px solid var(--line);
}

.tts-demo__list > .tts-card:first-child {
  border-top: 0;
}

.tts-card__play {
  flex: none;
  width: 44px;
  height: 44px;
  margin-top: .15rem;
  border: 2px solid var(--line-strong);
  border-radius: 50%;
  background: var(--blue);
  color: var(--ink-inverse);
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: transform .08s ease;
}

.tts-card__play:hover {
  transform: translateY(-1px);
}

.tts-card__play:active {
  transform: translateY(0);
}

.tts-card__icon {
  display: block;
  width: 0;
  height: 0;
  margin-left: 3px;
  border-style: solid;
  border-width: 7px 0 7px 12px;
  border-color: transparent transparent transparent currentColor;
}

.tts-card.is-playing .tts-card__icon {
  width: 12px;
  height: 13px;
  margin-left: 0;
  border: 0;
  border-left: 4px solid currentColor;
  border-right: 4px solid currentColor;
}

.tts-card__main {
  flex: 1 1 auto;
  min-width: 0;
}

.tts-card__text {
  margin: .15rem 0 .55rem !important;
  color: var(--paper-ink) !important;
  font-size: 1.02rem;
  line-height: 1.7 !important;
}

.tts-card__text b {
  font-weight: 700;
  color: var(--blue);
  border-bottom: 2px solid color-mix(in srgb, var(--blue) 35%, transparent);
}

.tts-card__track {
  height: 5px;
  border-radius: 3px;
  background: color-mix(in srgb, var(--line-strong) 16%, transparent);
  overflow: hidden;
}

.tts-card__fill {
  display: block;
  width: 0;
  height: 100%;
  background: var(--blue);
  transition: width .12s linear;
}

.tts-card__foot {
  display: flex;
  align-items: center;
  gap: .8rem;
  margin-top: .55rem;
}

.tts-card__time {
  font-variant-numeric: tabular-nums;
  font-size: .8rem;
  color: var(--muted);
}

.tts-card__reveal {
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--surface);
  color: var(--prose-ink);
  font: inherit;
  font-size: .8rem;
  padding: .2rem .6rem;
  cursor: pointer;
}

.tts-card__reveal::after {
  content: "\25BE";
  margin-left: .35rem;
  display: inline-block;
  transition: transform .15s ease;
}

.tts-card__reveal[aria-expanded="true"]::after {
  transform: rotate(180deg);
}

.tts-card__asr {
  margin-top: .65rem;
  padding: .6rem .75rem;
  border: 1px dashed var(--line);
  border-radius: 4px;
  background: var(--surface);
  font-size: .9rem;
  line-height: 1.6;
}

.tts-card__asr-k {
  display: block;
  font-size: .72rem;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: .15rem;
}

.tts-card__asr-v {
  color: var(--prose-ink);
}

.tts-card__badge {
  display: inline-block;
  margin-left: .4rem;
  padding: .05rem .5rem;
  border-radius: 999px;
  font-size: .72rem;
  font-weight: 700;
  white-space: nowrap;
}

.tts-card__badge.is-ok {
  color: var(--green);
  border: 1px solid color-mix(in srgb, var(--green) 45%, transparent);
}

.tts-card__badge.is-warn {
  color: var(--code-keyword);
  border: 1px solid color-mix(in srgb, var(--code-keyword) 55%, transparent);
}

@media (max-width: 640px) {
  .tts-card {
    padding: .9rem 1rem;
    gap: .7rem;
  }

  .tts-card__text {
    font-size: .98rem;
  }
}