/* Kopnex — house styles. Angular, dark, technical. No external fonts, no CDN. */

:root {
  --bg: #0a0b0d;
  --bg-alt: #101216;
  --surface: #15171c;
  --surface-2: #1b1e24;
  --border: #262931;
  --text: #edeff2;
  --text-dim: #9aa0ac;
  --text-faint: #676d78;
  --accent: #2f81ff;
  --accent-dim: #1f5fb8;
  --accent-ink: #0d1b2e;
  --focus: var(--accent);
  --danger: #ff3b4e;

  --font-sans: "Neue Haas Grotesk", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;

  --container: 1140px;
  --cut: 24px;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }
h1, h2, h3, h4 { margin: 0; font-weight: 700; letter-spacing: -0.01em; line-height: 1.15; }
p { margin: 0 0 1em; color: var(--text-dim); }
p:last-child { margin-bottom: 0; }
::selection { background: var(--accent); color: #fff; }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }

[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
[data-reveal].is-visible { opacity: 1; transform: translateY(0); }
@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1; transform: none; transition: none; }
}

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(10, 11, 13, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  height: 68px;
  gap: 24px;
}
.nav__right {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 20px;
}
.lang-switch--mobile { display: none; }
.nav__brand {
  display: flex;
  align-items: center;
  gap: 10px;
}
.nav__logo-chip {
  display: inline-flex;
  width: 44px;
  height: 44px;
  background: #fff;
  align-items: center;
  justify-content: center;
  padding: 3px;
  overflow: hidden;
}
.nav__logo-chip img { width: 100%; height: 100%; object-fit: contain; }
.nav__brand-text {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.06em;
}
.nav__menu {
  display: contents;
}
.nav__links {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 32px;
}
.nav__actions {
  display: flex;
  align-items: center;
  gap: 16px;
}
.nav__link {
  font-size: 14.5px;
  color: var(--text-dim);
  position: relative;
  padding: 4px 0;
}
.nav__link:hover { color: var(--text); }
.nav__link--active { color: var(--text); }
.nav__link--active::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -4px;
  height: 2px;
  background: var(--accent);
}
.lang-switch {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--text-dim);
  border: 1px solid var(--border);
  padding: 5px 9px;
}
.lang-switch:hover { color: var(--text); border-color: var(--text-dim); }
.nav__cta { padding: 9px 16px; font-size: 14px; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 0;
  padding: 8px;
  cursor: pointer;
}
.nav-toggle span { width: 22px; height: 2px; background: var(--text); display: block; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 22px;
  font-size: 15px;
  font-weight: 600;
  border: 1px solid transparent;
  clip-path: polygon(0 0, 100% 0, 100% 70%, calc(100% - 14px) 100%, 0 100%);
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
  cursor: pointer;
}
.btn--primary { background: var(--accent); color: #fff; }
.btn--primary:hover { background: #4d99ff; }
.btn--ghost { background: transparent; color: var(--text); border-color: var(--border); }
.btn--ghost:hover { border-color: var(--text-dim); }
.btn:active { transform: translateY(1px); }

/* ---------- Eyebrow / labels ---------- */
.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: 18px;
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: 96px 0 80px;
  background:
    linear-gradient(180deg, rgba(47,129,255,0.06), transparent 60%),
    repeating-linear-gradient(90deg, rgba(255,255,255,0.02) 0 1px, transparent 1px 80px);
  overflow: hidden;
}
.hero--page { padding: 72px 0 56px; }
.hero__inner { position: relative; z-index: 1; max-width: 760px; }
.hero__title { font-size: clamp(32px, 5vw, 52px); margin-bottom: 20px; }
.hero__subtitle { font-size: 18px; color: var(--text-dim); max-width: 640px; margin-bottom: 0; }
.hero--home .hero__subtitle { margin-bottom: 32px; }
.hero__actions { display: flex; gap: 14px; flex-wrap: wrap; }
.hero__cut {
  position: absolute;
  right: -10%;
  top: -20%;
  width: 60%;
  height: 140%;
  background: linear-gradient(135deg, rgba(47,129,255,0.10), transparent 55%);
  clip-path: polygon(30% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

/* ---------- Stats strip ---------- */
.stats-strip { border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); background: var(--bg-alt); }
.stats-strip__inner {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
}
.stat {
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  border-left: 1px solid var(--border);
}
.stat:first-child { border-left: 0; }
.stat__value { font-family: var(--font-mono); font-size: 26px; font-weight: 700; color: var(--text); }
.stat__label { font-size: 13.5px; color: var(--text-dim); }

/* ---------- Sections ---------- */
.section { padding: 80px 0; }
.section--alt { background: var(--bg-alt); }
.section__header { max-width: 640px; margin-bottom: 40px; }
.section__header--row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  max-width: none;
  flex-wrap: wrap;
  gap: 12px;
}
.section__title { font-size: clamp(24px, 3vw, 32px); }
.section__subtitle { margin-top: 10px; color: var(--text-dim); }
.subsection__title {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin: 36px 0 14px;
}
.subsection__title:first-of-type { margin-top: 8px; }
.link-more { font-size: 14.5px; color: var(--accent); font-weight: 600; }
.link-more:hover { text-decoration: underline; }
.link-more--back { display: inline-block; margin-bottom: 20px; color: var(--text-dim); }
.link-more--back:hover { color: var(--text); }

/* ---------- Service cards ---------- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}
.service-card {
  background: var(--surface);
  padding: 32px 28px;
  position: relative;
  transition: background 0.15s ease;
}
.service-card:hover { background: var(--surface-2); }
.service-card__tag {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--accent);
}
.service-card__title { font-size: 20px; margin: 14px 0 10px; }
.service-card__desc { font-size: 14.5px; margin-bottom: 0; }
.service-card__arrow {
  position: absolute;
  top: 28px; right: 24px;
  color: var(--text-faint);
  font-size: 18px;
  transition: transform 0.15s ease, color 0.15s ease;
}
.service-card:hover .service-card__arrow { transform: translateX(4px); color: var(--accent); }

/* ---------- What we are ---------- */
.what-we-are { max-width: 760px; }
.what-we-are__text p { font-size: 16.5px; color: var(--text-dim); }

/* ---------- Press ---------- */
.press-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}
.press-card {
  background: var(--surface);
  padding: 20px 22px;
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 16px;
}
.press-card:hover { background: var(--surface-2); }
.press-card__logo {
  flex-shrink: 0;
  width: 96px;
  height: 48px;
  background: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px;
}
.press-card__logo img { max-width: 100%; max-height: 100%; object-fit: contain; }
.press-card__text { display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.press-card__name { font-family: var(--font-mono); font-weight: 700; font-size: 14.5px; }
.press-card__desc { font-size: 13.5px; color: var(--text-dim); }

/* ---------- CTA banner ---------- */
.cta-banner {
  background: linear-gradient(135deg, var(--surface) 0%, var(--bg-alt) 100%);
  border-top: 2px solid var(--accent);
  color: var(--text);
  padding: 64px 0;
  clip-path: polygon(0 5%, 100% 0, 100% 100%, 0 95%);
}
.cta-banner__inner { text-align: center; max-width: 620px; margin: 0 auto; }
.cta-banner h2 { font-size: clamp(24px, 3vw, 32px); margin-bottom: 14px; color: var(--text); }
.cta-banner p { color: var(--text-dim); margin-bottom: 26px; }

/* ---------- Blog ---------- */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}
.blog-card { background: var(--surface); padding: 26px 24px; display: flex; flex-direction: column; gap: 10px; }
.blog-card:hover { background: var(--surface-2); }
.blog-card__date { font-family: var(--font-mono); font-size: 12px; color: var(--text-faint); }
.blog-card__title { font-size: 18px; }
.blog-card__excerpt { font-size: 14px; color: var(--text-dim); flex-grow: 1; }
.blog-card__more { font-size: 13.5px; color: var(--accent); font-weight: 600; }
.empty-state { color: var(--text-dim); }

/* ---------- Post ---------- */
.post__header { max-width: 720px; padding-top: 8px; }
.post__title { font-size: clamp(28px, 4vw, 40px); margin-bottom: 14px; }
.post__meta { font-family: var(--font-mono); font-size: 13px; color: var(--text-faint); display: flex; gap: 8px; margin-bottom: 16px; }
.post__tags { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 8px; }
.tag {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  color: var(--text-dim);
  border: 1px solid var(--border);
  padding: 4px 9px;
}
.post__content { max-width: 720px; padding: 32px 0 0; font-size: 17px; }
.post__content h2 { font-size: 24px; margin: 40px 0 14px; }
.post__content h3 { font-size: 19px; margin: 28px 0 12px; }
.post__content p { color: var(--text-dim); margin-bottom: 18px; }
.post__content a { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }
.post__content ul, .post__content ol { color: var(--text-dim); padding-left: 22px; margin-bottom: 18px; }
.post__content li { margin-bottom: 8px; }
.post__content blockquote {
  border-left: 3px solid var(--accent);
  margin: 24px 0;
  padding: 4px 0 4px 20px;
  color: var(--text-dim);
  font-style: italic;
}
.post__content pre {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 18px;
  overflow-x: auto;
  margin: 20px 0;
}
.post__content code { font-family: var(--font-mono); font-size: 13.5px; }
.post__content strong { color: var(--text); }
.post__content hr { border: 0; border-top: 1px solid var(--border); margin: 32px 0; }
.post__content img { border: 1px solid var(--border); margin: 20px 0; }

/* ---------- Formations ---------- */
.formation-category { margin-bottom: 56px; }
.formation-category:last-child { margin-bottom: 0; }
.formation-category__title {
  font-size: 22px;
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}
.formation-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}
.course-card { background: var(--surface); padding: 26px 24px; display: flex; flex-direction: column; }
.course-card:hover { background: var(--surface-2); }
.badge {
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 3px 8px;
  margin-bottom: 14px;
  border: 1px solid;
}
.badge--all { color: var(--text-dim); border-color: var(--border); background: var(--surface-2); }
.badge--beginner { color: #35d17a; border-color: #1f7a48; background: #0d2318; }
.badge--advanced { color: #ffb020; border-color: #8a5f10; background: #2a1e08; }
.badge--expert { color: var(--accent); border-color: var(--accent-dim); background: var(--accent-ink); }
.course-card__title { font-size: 18px; margin-bottom: 6px; }
.course-card__audience { font-size: 12.5px; color: var(--text-faint); margin-bottom: 12px; }
.course-card__desc { font-size: 14px; color: var(--text-dim); flex-grow: 1; margin-bottom: 16px; }
.course-card__cta { font-size: 13.5px; font-weight: 600; color: var(--accent); }
.course-card__cta:hover { text-decoration: underline; }

/* ---------- About ---------- */
.about-bio { max-width: 720px; }
.about-bio p { font-size: 16.5px; }
.cve-list, .oss-list { display: flex; flex-direction: column; gap: 1px; background: var(--border); border: 1px solid var(--border); margin-bottom: 8px; }
.cve-item { background: var(--surface); padding: 16px 20px; display: flex; gap: 16px; align-items: baseline; flex-wrap: wrap; }
.cve-item:hover { background: var(--surface-2); }
.cve-item__id { font-family: var(--font-mono); font-weight: 700; color: var(--accent); font-size: 14px; min-width: 150px; }
.cve-item__desc { font-size: 14.5px; color: var(--text-dim); }
.oss-item { background: var(--surface); padding: 14px 20px; font-family: var(--font-mono); font-size: 13.5px; }
.oss-item:hover { background: var(--surface-2); color: var(--accent); }

/* ---------- Contact ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 48px;
  align-items: start;
}
.form { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.form-field { display: flex; flex-direction: column; gap: 8px; }
.form-field--full { grid-column: 1 / -1; }
.form-field--hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.form-label { font-size: 13.5px; color: var(--text-dim); }
.form-input {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 12px 14px;
  font: inherit;
  font-size: 15px;
}
.form-input:focus { border-color: var(--accent); }
.form-textarea { resize: vertical; }
.form-select { appearance: none; }
.form-status { font-size: 14px; margin: 12px 0 0; }
.form-status[data-state="ok"] { color: #35d17a; }
.form-status[data-state="error"] { color: var(--danger); }
.contact-aside {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 24px;
}
.contact-aside__label { font-size: 13.5px; color: var(--text-dim); margin-bottom: 8px; }
.contact-aside__email { font-family: var(--font-mono); font-size: 15px; color: var(--accent); word-break: break-all; }

/* ---------- Legal ---------- */
.legal-content { max-width: 720px; }
.legal-section { margin-bottom: 32px; }
.legal-section h2 { font-size: 18px; margin-bottom: 12px; }
.legal-section p { font-size: 14.5px; }

/* ---------- Error page ---------- */
.error-page { text-align: left; }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--border); background: var(--bg-alt); padding: 56px 0 0; }
.footer__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 32px;
  padding-bottom: 40px;
}
.footer__col { display: flex; flex-direction: column; gap: 10px; }
.footer__col h3 { font-size: 13px; color: var(--text-faint); text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 4px; }
.footer__col a { color: var(--text-dim); font-size: 14.5px; }
.footer__col a:hover { color: var(--text); }
.footer__brand p { font-size: 14px; margin-top: 6px; }
.footer__bottom {
  border-top: 1px solid var(--border);
  padding: 20px 0;
  font-size: 13px;
  color: var(--text-faint);
}

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .services-grid, .press-grid, .blog-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-strip__inner { grid-template-columns: 1fr; }
  .stat { border-left: 0; border-top: 1px solid var(--border); }
  .stat:first-child { border-top: 0; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer__grid { grid-template-columns: 1fr; }
}

@media (max-width: 700px) {
  .nav-toggle { display: flex; }
  .lang-switch--mobile { display: inline-flex; align-items: center; }
  .lang-switch--desktop { display: none; }
  .nav__menu {
    display: none;
    position: absolute;
    top: 68px; left: 0; right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    align-items: stretch;
    padding: 20px 24px 28px;
    gap: 18px;
  }
  .nav__menu.is-open { display: flex; }
  .nav__links, .nav__actions {
    flex-direction: column;
    align-items: flex-start;
    gap: 18px;
  }
  .nav__actions { justify-self: stretch; }
  .nav__cta { width: 100%; justify-content: center; }
  .services-grid, .press-grid, .blog-grid { grid-template-columns: 1fr; }
  .form { grid-template-columns: 1fr; }
  .hero { padding: 64px 0 48px; }
  .section { padding: 56px 0; }
}