/* H3cApp site - plain CSS, no build step. Paths in the HTML are relative so
   the site works under the /H3cApp/ project path and from a local folder. */

:root {
  --bg: #f6f6f7;
  --surface: #ffffff;
  --text: #1d1d1f;
  --text-muted: #55565b;
  --border: #dcdce0;
  --accent: #1557c8;
  --accent-hover: #0f469f;
  --accent-soft: #e8effc;
  --stage: #121214;
  --stage-text: #e9e9ec;
  --warn-bg: #fff6e5;
  --warn-border: #e5b65c;
  --radius: 12px;
  --max: 1080px;
  --prose: 40em;
  --font: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN",
    "Noto Sans JP", "Yu Gothic", "Segoe UI", sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 76px;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.85;
  overflow-wrap: anywhere;
}

img,
video {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--accent);
  text-underline-offset: 0.2em;
}

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

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--surface);
  padding: 8px 12px;
  z-index: 100;
}

.skip-link:focus {
  left: 8px;
  top: 8px;
}

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(246, 246, 247, 0.94);
  border-bottom: 1px solid var(--border);
  backdrop-filter: saturate(160%) blur(10px);
  -webkit-backdrop-filter: saturate(160%) blur(10px);
}

.header-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 10px 20px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  color: var(--text);
  text-decoration: none;
  margin-right: auto;
}

.brand img {
  width: 32px;
  height: 32px;
}

.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 2px 16px;
  font-size: 15px;
}

.site-nav li {
  margin: 0;
}

.site-nav a {
  color: var(--text);
  text-decoration: none;
  padding: 4px 0;
  display: inline-block;
}

.site-nav .lang-switch a {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 1px 12px;
  background: var(--surface);
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--accent);
}

.site-nav a[aria-current="page"] {
  font-weight: 700;
}

@media (min-width: 1100px) {
  .site-nav ul {
    flex-wrap: nowrap;
    align-items: center;
    white-space: nowrap;
  }
}

/* ---------- Layout ---------- */

main {
  display: block;
}

.section {
  max-width: var(--max);
  margin: 0 auto;
  padding: 56px 20px;
}

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

.section-narrow {
  max-width: calc(var(--prose) + 40px);
}

h1,
h2,
h3,
h4 {
  line-height: 1.35;
  letter-spacing: 0.01em;
  margin: 0 0 0.6em;
}

h1 {
  font-size: clamp(30px, 5vw, 48px);
}

h2 {
  font-size: clamp(24px, 3.4vw, 32px);
}

h3 {
  font-size: 21px;
  margin-top: 1.6em;
}

h4 {
  font-size: 18px;
  margin-top: 1.4em;
}

p,
ul,
ol,
dl {
  margin: 0 0 1em;
  max-width: var(--prose);
}

li + li {
  margin-top: 0.3em;
}

.lead {
  font-size: 19px;
  color: var(--text-muted);
}

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

.small {
  font-size: 15px;
}

/* UI labels as shown in the app: distinct from headings and prose. */
.ui {
  font-weight: 700;
  background: var(--accent-soft);
  border-radius: 4px;
  padding: 0 0.3em;
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
}

kbd {
  font-family: var(--font);
  font-size: 0.9em;
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 5px;
  padding: 0 0.35em;
  background: var(--surface);
}

code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: #ececef;
  border-radius: 4px;
  padding: 0.05em 0.3em;
}

/* ---------- Buttons ---------- */

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 24px 0 12px;
}

.button {
  display: inline-block;
  padding: 12px 22px;
  border-radius: 999px;
  font-weight: 700;
  text-decoration: none;
  border: 2px solid var(--accent);
  line-height: 1.4;
}

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

.button-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  color: #fff;
}

.button-secondary {
  background: transparent;
  color: var(--accent);
}

.button-secondary:hover {
  background: var(--accent-soft);
}

/* ---------- Hero ---------- */

.hero {
  max-width: var(--max);
  margin: 0 auto;
  padding: 56px 20px 40px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.hero-copy .eyebrow {
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 8px;
}

.cta-note {
  font-size: 15px;
  color: var(--text-muted);
  margin: 0;
}

.hero-shot {
  margin: 0;
}

.hero-shot img {
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.12);
  width: 100%;
}

.hero-shot figcaption {
  font-size: 14px;
  color: var(--text-muted);
  margin-top: 8px;
}

@media (min-width: 960px) {
  .hero {
    grid-template-columns: 5fr 7fr;
    align-items: center;
    padding-top: 72px;
  }
}

/* ---------- Examples (dark stage only around media) ---------- */

.examples {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 24px;
}

@media (min-width: 760px) {
  .examples {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* One line per release, between the hero and the examples. */
.updates {
  padding-top: 8px;
  padding-bottom: 36px;
}

.updates h2 {
  font-size: 19px;
}

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

.update-list a {
  color: var(--text);
  text-decoration: none;
}

.update-list a:hover strong,
.update-list a:focus-visible strong {
  text-decoration: underline;
}

.update-list strong {
  color: var(--accent);
}

.update-date {
  color: var(--text-muted);
}

.example {
  margin: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.example .media {
  background: var(--stage);
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 1 / 1;
}

@media (max-width: 759px) {
  .example .media {
    aspect-ratio: auto;
  }
}

.example video {
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: var(--stage);
}

.example figcaption {
  padding: 14px 16px 16px;
  font-size: 15px;
  line-height: 1.7;
}

.example .spec {
  font-weight: 700;
  margin: 0 0 6px;
}

.example .prompt {
  color: var(--text-muted);
  margin: 6px 0 0;
  font-size: 14px;
}

/* ---------- Feature list ---------- */

.features {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  list-style: none;
  padding: 0;
  max-width: none;
}

@media (min-width: 760px) {
  .features {
    grid-template-columns: repeat(3, 1fr);
  }
}

.features li {
  margin: 0;
}

.features h3 {
  margin-top: 0;
  font-size: 19px;
}

.features p {
  margin: 0 0 0.5em;
}

/* ---------- Tables ---------- */

.table-wrap {
  overflow-x: auto;
  margin: 0 0 1.2em;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}

table {
  border-collapse: collapse;
  width: 100%;
  font-size: 15.5px;
  line-height: 1.65;
}

th,
td {
  text-align: left;
  vertical-align: top;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
}

tr:last-child th,
tr:last-child td {
  border-bottom: 0;
}

thead th {
  background: #f0f0f3;
  font-size: 14.5px;
  white-space: nowrap;
}

tbody th {
  font-weight: 700;
  min-width: 8em;
}

caption {
  caption-side: bottom;
  text-align: left;
  font-size: 14px;
  color: var(--text-muted);
  padding: 10px 14px;
  border-top: 1px solid var(--border);
}

.num {
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

/* ---------- Steps ---------- */

.flow {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  list-style: none;
  padding: 0;
  counter-reset: flow;
  max-width: none;
}

@media (min-width: 760px) {
  .flow {
    grid-template-columns: repeat(3, 1fr);
  }
}

.flow > li {
  counter-increment: flow;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  margin: 0;
}

.flow > li::before {
  content: counter(flow);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  margin-bottom: 8px;
}

.flow h3 {
  margin-top: 0;
  font-size: 19px;
}

.flow p {
  margin-bottom: 0.4em;
}

.steps {
  padding-left: 1.4em;
}

.steps > li {
  margin-bottom: 0.9em;
  padding-left: 0.2em;
}

.steps > li::marker {
  font-weight: 700;
  color: var(--accent);
}

/* ---------- Callouts ---------- */

.note,
.warn {
  border-radius: var(--radius);
  padding: 14px 18px;
  margin: 0 0 1.2em;
  max-width: var(--prose);
}

.note {
  background: var(--accent-soft);
  border-left: 4px solid var(--accent);
}

.warn {
  background: var(--warn-bg);
  border-left: 4px solid var(--warn-border);
}

.note p:last-child,
.warn p:last-child,
.note ul:last-child,
.warn ul:last-child {
  margin-bottom: 0;
}

.checkpoint {
  background: var(--surface);
  border: 2px solid var(--accent);
  border-radius: var(--radius);
  padding: 14px 18px;
  margin: 0 0 1.4em;
  max-width: var(--prose);
}

.checkpoint p {
  margin: 0;
}

/* ---------- Prompt copy block ---------- */

.copy-block {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  margin: 0 0 1.2em;
  max-width: var(--prose);
}

.copy-block textarea {
  width: 100%;
  min-height: 9.5em;
  resize: vertical;
  font-family: var(--mono);
  font-size: 14.5px;
  line-height: 1.6;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px;
  background: #fafafb;
  color: var(--text);
}

.copy-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 10px;
  flex-wrap: wrap;
}

.copy-button {
  font: inherit;
  font-size: 15px;
  font-weight: 700;
  padding: 8px 16px;
  border-radius: 999px;
  border: 2px solid var(--accent);
  background: var(--accent);
  color: #fff;
  cursor: pointer;
}

.copy-button:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

.copy-status {
  font-size: 14.5px;
  color: var(--text-muted);
}

.copy-status.ok {
  color: #1b7a3a;
}

.copy-status.error {
  color: #b3261e;
}

/* ---------- Figures in guides ---------- */

.shot {
  margin: 0 0 1.4em;
}

.shot img {
  border-radius: 10px;
  border: 1px solid var(--border);
}

.shot figcaption {
  font-size: 14px;
  color: var(--text-muted);
  margin-top: 6px;
}

/* ---------- Details (advanced topics) ---------- */

details {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 4px 18px;
  margin: 0 0 12px;
  max-width: var(--prose);
}

details[open] {
  padding-bottom: 12px;
}

summary {
  cursor: pointer;
  font-weight: 700;
  padding: 10px 0;
}

/* ---------- Page header (guides) ---------- */

.page-head {
  max-width: var(--max);
  margin: 0 auto;
  padding: 48px 20px 8px;
}

.toc {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 18px;
  margin: 16px 0 0;
  max-width: var(--prose);
}

.toc p {
  margin: 0 0 4px;
  font-weight: 700;
}

.toc ol {
  margin: 0;
  padding-left: 1.3em;
}

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--border);
  background: #eeeef1;
  font-size: 15px;
}

.footer-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 32px 20px 40px;
}

.footer-inner p {
  max-width: none;
}

.footer-links {
  list-style: none;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 18px;
  max-width: none;
}

.footer-links li {
  margin: 0;
}

/* ---------- Motion ---------- */

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    transition: none !important;
    animation: none !important;
  }
}

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

/* ---------- Small screens ---------- */

@media (max-width: 520px) {
  body {
    font-size: 16.5px;
  }
  .site-header {
    position: static;
  }
  tbody th {
    min-width: 5.5em;
  }
  th,
  td {
    padding: 9px 10px;
  }
  html {
    scroll-padding-top: 8px;
  }
  .section {
    padding: 40px 16px;
  }
  .hero,
  .page-head,
  .header-inner,
  .footer-inner {
    padding-left: 16px;
    padding-right: 16px;
  }
  .site-nav ul {
    gap: 2px 12px;
    font-size: 14.5px;
  }
  .button {
    width: 100%;
    text-align: center;
  }
}