/* === Design tokens === */
:root {
  --c-bg: #ffffff;
  --c-bg-alt: #f6f8fb;
  --c-surface: #ffffff;
  --c-border: #e5e8ee;
  --c-text: #1f2329;
  --c-text-sub: #5a6473;
  --c-text-mute: #8b94a3;
  --c-brand: #2e6cff;
  --c-brand-dark: #1f4fd1;
  --c-accent: #0ea5e9;

  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 16px;

  --s-1: 4px;
  --s-2: 8px;
  --s-3: 12px;
  --s-4: 16px;
  --s-5: 24px;
  --s-6: 32px;
  --s-7: 48px;
  --s-8: 64px;
  --s-9: 96px;

  --container: 1200px;

  --font: PingFangSC-Regular, "Roboto", "Helvetica Neue", Helvetica, Tahoma, Arial,
          "PingFang SC", "Microsoft YaHei", sans-serif;

  --shadow-sm: 0 1px 2px rgba(15, 23, 42, .04), 0 1px 3px rgba(15, 23, 42, .06);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, .06), 0 2px 6px rgba(15, 23, 42, .04);
}

/* === Reset === */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  color: var(--c-text);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; margin: 0; padding: 0; }
a { color: var(--c-brand); text-decoration: none; }
a:hover { color: var(--c-brand-dark); }
a:focus-visible { outline: 2px solid var(--c-brand); outline-offset: 2px; border-radius: 2px; }
h1, h2, h3, h4 { margin: 0 0 var(--s-3); line-height: 1.3; color: var(--c-text); }
h1 { font-size: clamp(1.7rem, 6vw, 2.6rem); font-weight: 700; }
h2 { font-size: clamp(1.4rem, 4.5vw, 2rem); font-weight: 700; }
h3 { font-size: clamp(1.1rem, 3.5vw, 1.25rem); font-weight: 600; }
p { margin: 0 0 var(--s-3); }
blockquote { margin: 0; }

/* === Accessibility helper === */
.skip-link {
  position: absolute;
  top: -100px;
  left: 0;
  background: var(--c-brand);
  color: #fff;
  padding: var(--s-2) var(--s-4);
  z-index: 100;
}
.skip-link:focus { top: 0; }

/* === Layout helpers === */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--s-4);
}

.section-head {
  text-align: center;
  margin-bottom: var(--s-6);
}
.section-head p {
  color: var(--c-text-sub);
  max-width: 720px;
  margin-inline: auto;
}

main > section {
  padding-block: var(--s-7);
}

/* === Header === */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: saturate(180%) blur(10px);
  -webkit-backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--c-border);
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-4);
  min-height: 88px;
}
.brand { display: inline-flex; align-items: center; }
.brand__logo {
  width: auto;
  height: 60px;
  object-fit: contain;
}
.site-nav {
  display: none;
  gap: var(--s-5);
  align-items: center;
  font-size: .95rem;
}
.site-nav a {
  color: var(--c-text);
  padding: var(--s-2) 0;
  position: relative;
}
.site-nav a:hover { color: var(--c-brand); }

/* === Hero === */
.hero {
  background:
    radial-gradient(1200px 400px at 20% 0%, rgba(46, 108, 255, .08), transparent 60%),
    radial-gradient(800px 300px at 100% 100%, rgba(14, 165, 233, .08), transparent 60%),
    var(--c-bg-alt);
  padding-block: var(--s-8) var(--s-7);
  text-align: center;
}
.hero__title {
  background: linear-gradient(120deg, var(--c-brand), var(--c-accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero__lede {
  color: var(--c-text-sub);
  max-width: 760px;
  margin: 0 auto var(--s-6);
  font-size: clamp(.95rem, 2.5vw, 1.05rem);
}
.hero__entry {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s-4);
  max-width: 960px;
  margin-inline: auto;
}
.entry-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: var(--s-5);
  box-shadow: var(--shadow-sm);
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.entry-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: rgba(46, 108, 255, .35);
}
.entry-card__title {
  margin: 0 0 var(--s-1);
  font-size: 1.4rem;
  color: var(--c-brand);
}
.entry-card__sub { color: var(--c-text-sub); margin: 0; }

/* === Hero visualization === */
.hero__viz {
  position: relative;
  max-width: 960px;
  margin: var(--s-5) auto var(--s-6);
}

/* Mobile fallback: hide the orbital diagram, show a chip cloud */
.hero__viz-lines,
.hero__viz-hub,
.hero__viz-tags { display: none; }

.hero__viz-chips {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--s-2);
  padding: 0;
}
.hero__viz-chips li span {
  display: inline-block;
  padding: 6px 14px;
  background: var(--c-surface);
  border: 1px solid rgba(46, 108, 255, .25);
  border-radius: 999px;
  font-size: .85rem;
  color: var(--c-text-sub);
  box-shadow: 0 1px 2px rgba(15, 23, 42, .04);
}

/* Tablet+ : switch to orbital diagram */
@media (min-width: 760px) {
  .hero__viz {
    height: 360px;
  }
  .hero__viz-chips { display: none; }
  .hero__viz-lines,
  .hero__viz-hub,
  .hero__viz-tags { display: block; }

  .hero__viz-lines {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    overflow: visible;
  }

  .hero__viz-hub {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 132px;
    height: 132px;
    margin: -66px 0 0 -66px;
    border-radius: 50%;
    display: grid;
    place-items: center;
    isolation: isolate;
  }
  .hero__viz-hub-ring {
    position: absolute;
    inset: 0;
    border-radius: 50%;
    background:
      radial-gradient(closest-side, rgba(46, 108, 255, .18), transparent 70%),
      conic-gradient(from 0deg, rgba(46, 108, 255, .35), rgba(14, 165, 233, .35), rgba(46, 108, 255, .35));
    filter: blur(.5px);
    animation: hero-viz-spin 18s linear infinite;
    z-index: -1;
  }
  .hero__viz-hub-core {
    width: 96px;
    height: 96px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--c-brand) 0%, var(--c-accent) 100%);
    color: #fff;
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: .04em;
    display: grid;
    place-items: center;
    box-shadow:
      0 12px 30px rgba(46, 108, 255, .35),
      0 0 0 6px rgba(255, 255, 255, .9),
      0 0 0 7px rgba(46, 108, 255, .18);
    animation: hero-viz-breathe 3.6s ease-in-out infinite;
  }

  .hero__viz-tags {
    position: absolute;
    inset: 0;
    list-style: none;
    margin: 0;
    padding: 0;
  }
  .hero__viz-tag {
    position: absolute;
    top: var(--y);
    left: var(--x);
    transform: translate(-50%, -50%);
    animation: hero-viz-float 6s ease-in-out infinite;
  }
  .hero__viz-tag:nth-child(2n) { animation-delay: -1.5s; }
  .hero__viz-tag:nth-child(3n) { animation-delay: -3s; }
  .hero__viz-tag:nth-child(5n) { animation-delay: -4.5s; }
  .hero__viz-tag span {
    display: inline-block;
    padding: 8px 16px;
    background: var(--c-surface);
    border: 1px solid rgba(46, 108, 255, .22);
    border-radius: 999px;
    font-size: .9rem;
    color: var(--c-text);
    box-shadow:
      0 4px 14px rgba(15, 23, 42, .06),
      0 1px 2px rgba(15, 23, 42, .04);
    white-space: nowrap;
    transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
  }
  .hero__viz-tag span:hover {
    transform: translateY(-1px);
    border-color: rgba(46, 108, 255, .5);
    box-shadow:
      0 8px 22px rgba(46, 108, 255, .15),
      0 1px 2px rgba(15, 23, 42, .04);
  }

  .hero__viz-pulse {
    opacity: 0;
    animation: hero-viz-pulse 6s linear infinite;
  }
  .hero__viz-pulse--1 { animation-delay: 0s;   offset-path: path("M 400 180 L 160 60");  }
  .hero__viz-pulse--2 { animation-delay: -1.5s; offset-path: path("M 400 180 L 720 180"); }
  .hero__viz-pulse--3 { animation-delay: -3s;   offset-path: path("M 400 180 L 400 324"); }
  .hero__viz-pulse--4 { animation-delay: -4.5s; offset-path: path("M 400 180 L 80 180");  }
  .hero__viz-pulse {
    offset-rotate: 0deg;
    offset-distance: 0%;
    filter: drop-shadow(0 0 6px rgba(46, 108, 255, .8));
  }
}

@media (min-width: 960px) {
  .hero__viz { height: 380px; }
  .hero__viz-hub { width: 148px; height: 148px; margin: -74px 0 0 -74px; }
  .hero__viz-hub-core { width: 108px; height: 108px; font-size: 1.4rem; }
}

@keyframes hero-viz-breathe {
  0%, 100% { transform: scale(1); }
  50%      { transform: scale(1.04); }
}
@keyframes hero-viz-spin {
  to { transform: rotate(360deg); }
}
@keyframes hero-viz-float {
  0%, 100% { transform: translate(-50%, -50%); }
  50%      { transform: translate(-50%, calc(-50% - 6px)); }
}
@keyframes hero-viz-pulse {
  0%   { offset-distance: 0%;   opacity: 0; }
  10%  { opacity: 1; }
  90%  { opacity: 1; }
  100% { offset-distance: 100%; opacity: 0; }
}

/* === Section: Products === */
.products { background: var(--c-bg); }
.products__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s-4);
}
.product-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: var(--s-5);
  box-shadow: var(--shadow-sm);
}
.product-card h3 {
  color: var(--c-brand);
  font-size: 1.5rem;
  margin: 0 0 var(--s-2);
}
.product-card__sub {
  color: var(--c-text);
  font-weight: 600;
  margin-bottom: var(--s-3);
}
.product-card__desc {
  color: var(--c-text-sub);
  margin-bottom: var(--s-3);
}
.product-card__tag {
  display: inline-block;
  background: var(--c-bg-alt);
  color: var(--c-text-sub);
  padding: var(--s-1) var(--s-3);
  border-radius: 999px;
  font-size: .85rem;
  margin: 0;
}

/* === Section: API Market === */
.market { background: var(--c-bg-alt); }
.market__cats,
.oneapi__cats {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-2);
  justify-content: center;
  margin-bottom: var(--s-6);
}
.market__cats a,
.oneapi__cats a {
  display: inline-block;
  padding: var(--s-2) var(--s-4);
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: 999px;
  font-size: .9rem;
  color: var(--c-text);
}
.market__cats a:hover,
.oneapi__cats a:hover {
  background: var(--c-brand);
  border-color: var(--c-brand);
  color: #fff;
}
.market__list,
.oneapi__list {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s-4);
}

.api-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  padding: var(--s-4);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: var(--s-2);
  transition: transform .2s ease, box-shadow .2s ease;
}
.api-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.api-card h3 {
  font-size: 1.05rem;
  margin: 0;
}
.api-card p {
  margin: 0;
  color: var(--c-text-sub);
  font-size: .9rem;
  line-height: 1.55;
}
.api-card img {
  width: 40px;
  height: 40px;
  object-fit: contain;
}
.api-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-2);
}
.api-card__tags span {
  display: inline-block;
  padding: 2px 10px;
  background: var(--c-bg-alt);
  border-radius: 999px;
  font-size: .75rem;
  color: var(--c-text-sub);
}
.api-card__price {
  margin-top: auto;
  color: var(--c-text-mute);
  font-size: .85rem;
}
.api-card__price .price {
  color: #e0392f;
  font-weight: 700;
}

/* === Section: OneAPI === */
.oneapi { background: var(--c-bg); }
.oneapi__list .api-card {
  flex-direction: row;
  align-items: flex-start;
  gap: var(--s-3);
}
.oneapi__list .api-card img { flex-shrink: 0; }

/* === Section: Cases === */
.cases { background: var(--c-bg-alt); }
.cases__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s-4);
  margin-bottom: var(--s-6);
}
.case {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  padding: var(--s-5);
  box-shadow: var(--shadow-sm);
  position: relative;
}
.case::before {
  content: '"';
  position: absolute;
  top: -8px;
  left: var(--s-4);
  font-size: 4rem;
  line-height: 1;
  color: var(--c-brand);
  opacity: .3;
  font-family: Georgia, serif;
}
.case p {
  color: var(--c-text-sub);
  font-size: .95rem;
  margin: 0;
  padding-top: var(--s-3);
}
.case__brand {
  color: var(--c-brand);
  margin-top: var(--s-2);
  margin-bottom: var(--s-2);
}
.case--dataarts { margin-top: var(--s-5); }

.cases__partners-title {
  text-align: center;
  margin-top: var(--s-6);
  margin-bottom: var(--s-4);
  color: var(--c-text-sub);
  font-size: 1rem;
  font-weight: 500;
}
.cases__partners {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--s-3);
  align-items: center;
  justify-items: center;
  margin-bottom: var(--s-6);
}
.cases__partners img {
  max-height: 48px;
  width: auto;
  filter: grayscale(40%);
  opacity: .85;
  transition: filter .2s ease, opacity .2s ease;
}
.cases__partners img:hover {
  filter: none;
  opacity: 1;
}

/* === Section: Contact === */
.contact {
  background: linear-gradient(135deg, var(--c-brand) 0%, var(--c-accent) 100%);
  color: #fff;
  text-align: center;
}
.contact h2,
.contact .section-head p { color: #fff; }
.contact__cta { margin-block: var(--s-5); }
.contact .btn {
  display: inline-block;
  padding: var(--s-3) var(--s-7);
  background: #fff;
  color: var(--c-brand);
  border-radius: 999px;
  font-weight: 600;
  font-size: 1rem;
  box-shadow: 0 8px 20px rgba(0, 0, 0, .15);
  transition: transform .2s ease, box-shadow .2s ease;
}
.contact .btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(0, 0, 0, .2);
}
.contact__line {
  font-size: 1rem;
  color: rgba(255, 255, 255, .92);
}
.contact__line a {
  color: #fff;
  border-bottom: 1px dashed rgba(255, 255, 255, .6);
}
.contact__line a:hover { color: #fff; border-bottom-color: #fff; }

/* === Section: Catalog === */
.catalog { background: var(--c-bg); }
.catalog__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s-4);
}
.cat-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  padding: var(--s-4);
  display: flex;
  flex-direction: column;
  gap: var(--s-2);
  box-shadow: var(--shadow-sm);
}
.cat-card img {
  width: 40px;
  height: 40px;
  object-fit: contain;
}
.cat-card h3 {
  margin: 0;
  font-size: 1.1rem;
  color: var(--c-text);
}
.cat-card ul {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-2);
}
.cat-card li {
  padding: 4px 10px;
  background: var(--c-bg-alt);
  border-radius: var(--r-sm);
  font-size: .85rem;
  color: var(--c-text-sub);
}

/* === Footer === */
.site-footer {
  background: #15181f;
  color: #b8bcc4;
  padding-block: var(--s-7) var(--s-4);
  font-size: .9rem;
}
.site-footer a { color: #b8bcc4; }
.site-footer a:hover { color: #fff; }
.site-footer h2 {
  color: #fff;
  font-size: 1rem;
  margin-bottom: var(--s-3);
}
.site-footer__cols {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--s-5);
  margin-bottom: var(--s-5);
}
.site-footer__cols nav ul li {
  margin-bottom: var(--s-2);
}
.site-footer__qr {
  grid-column: 1 / -1;
  text-align: center;
  margin-top: var(--s-3);
}
.site-footer__qr img {
  width: 110px;
  height: 110px;
  margin: 0 auto var(--s-2);
  border-radius: var(--r-sm);
  background: #fff;
  padding: var(--s-2);
}
.site-footer__qr p {
  margin: 0;
  font-size: .85rem;
}
.site-footer__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-4);
  justify-content: center;
  border-top: 1px solid rgba(255, 255, 255, .08);
  padding-top: var(--s-4);
  margin-top: var(--s-3);
}
.site-footer__copy {
  text-align: center;
  margin: var(--s-3) 0 0;
  font-size: .8rem;
  color: #6c7280;
}
.site-footer__copy a { color: #6c7280; }
.site-footer__copy a:hover { color: #fff; }

/* === Breakpoint: tablet (≥ 600px) === */
@media (min-width: 600px) {
  .hero__entry { grid-template-columns: repeat(3, 1fr); }
  .market__list { grid-template-columns: repeat(2, 1fr); }
  .oneapi__list { grid-template-columns: repeat(2, 1fr); }
  .cases__grid { grid-template-columns: repeat(2, 1fr); }
  .cases__partners { grid-template-columns: repeat(3, 1fr); }
  .catalog__grid { grid-template-columns: repeat(2, 1fr); }
  .site-footer__cols { grid-template-columns: repeat(4, 1fr); }
  .site-footer__qr {
    grid-column: auto;
    text-align: left;
    margin-top: 0;
  }
  .site-footer__qr img { margin-inline: 0; }
}

/* === Breakpoint: desktop (≥ 960px) === */
@media (min-width: 960px) {
  .site-nav { display: flex; }
  .products__grid { grid-template-columns: repeat(3, 1fr); }
  .market__list { grid-template-columns: repeat(3, 1fr); }
  .oneapi__list { grid-template-columns: repeat(2, 1fr); }
  .cases__partners { grid-template-columns: repeat(5, 1fr); }
  .catalog__grid { grid-template-columns: repeat(4, 1fr); }
  .site-footer__cols { grid-template-columns: repeat(4, 1fr) auto; }
  main > section { padding-block: var(--s-9); }
}

/* === Breakpoint: wide (≥ 1200px) === */
@media (min-width: 1200px) {
  .cases__partners { grid-template-columns: repeat(6, 1fr); }
}

/* === Motion preferences === */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
    scroll-behavior: auto !important;
  }
}

/* === Print === */
@media print {
  .site-header, .site-footer, .skip-link, .contact__cta { display: none; }
  main > section { padding-block: var(--s-4); }
  a { color: #000; text-decoration: underline; }
}