/* ==========================================================================
   Kernel Konsulting — site stylesheet
   Single theme, no build step, no external font or JS dependencies.
   ========================================================================== */

/* --- tokens ------------------------------------------------------------- */
:root {
  --ink:        #0b0f14;
  --ink-2:      #121922;
  --ink-3:      #1c2632;
  --paper:      #ffffff;
  --paper-2:    #f6f8fa;
  --line:       #e2e8ee;
  --line-dark:  rgba(255, 255, 255, .2);
  --muted:      #5a6675;
  --muted-dark: #aab7c5;
  --cyan:       #25aae1;
  --cyan-ink:   #0f6f96;   /* accessible cyan on white for text */
  --cyan-soft:  #e8f6fd;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Inter,
               "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
               "Liberation Mono", monospace;

  --wrap: 1140px;
  --header-h: 4.25rem;
  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 1px 2px rgba(11, 15, 20, .06), 0 12px 32px -12px rgba(11, 15, 20, .18);
  --shadow-lg: 0 24px 60px -24px rgba(11, 15, 20, .35);

  --section-y: clamp(4rem, 9vw, 7.5rem);
  --ease: cubic-bezier(.22, .61, .36, 1);
}

/* --- reset -------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5.5rem;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, svg, picture { display: block; max-width: 100%; }
img { height: auto; }
button, input, textarea, select { font: inherit; color: inherit; }
a { color: var(--cyan-ink); text-decoration-thickness: 1px; text-underline-offset: 2px; }

h1, h2, h3 { line-height: 1.15; letter-spacing: -.02em; font-weight: 700; text-wrap: balance; }
p { text-wrap: pretty; }

::selection { background: var(--cyan); color: #fff; }

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

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; border: 0;
}

.skip-link {
  position: absolute;
  left: 1rem; top: -100px;
  z-index: 100;
  padding: .7rem 1.1rem;
  background: var(--ink); color: #fff;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  font-weight: 600; text-decoration: none;
  transition: top .18s var(--ease);
}
.skip-link:focus { top: 0; }

/* --- layout ------------------------------------------------------------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: clamp(1.1rem, 4vw, 2rem);
}

.section { padding-block: var(--section-y); }

.section__head { max-width: 46rem; margin-bottom: clamp(2.25rem, 5vw, 3.5rem); }
.section__head h2 { font-size: clamp(1.75rem, 4vw, 2.6rem); }
.section__head--center { margin-inline: auto; text-align: center; }
.section__sub { margin-top: 1rem; color: var(--muted); font-size: 1.0625rem; }

.eyebrow {
  display: block;
  font-family: var(--font-mono);
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: .9rem;
}
.eyebrow--dark { color: var(--cyan-ink); }

/* --- buttons ------------------------------------------------------------ */
.btn {
  --btn-bg: var(--ink);
  --btn-fg: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .82rem 1.5rem;
  border: 1px solid transparent;
  border-radius: 999px;
  background: var(--btn-bg);
  color: var(--btn-fg);
  font-weight: 600;
  font-size: .97rem;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
  transition: transform .18s var(--ease), box-shadow .18s var(--ease),
              background-color .18s var(--ease), border-color .18s var(--ease);
}
.btn:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.btn:active { transform: translateY(0); }

.btn--primary { --btn-bg: var(--cyan); --btn-fg: #041f2c; }
.btn--primary:hover { --btn-bg: #46bdec; }

.btn--ghost {
  --btn-bg: transparent;
  --btn-fg: #fff;
  border-color: rgba(255, 255, 255, .35);
}
.btn--ghost:hover { border-color: #fff; background: rgba(255, 255, 255, .08); }

.btn--sm { padding: .6rem 1.1rem; font-size: .9rem; }

/* --- header ------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background-color .25s var(--ease), border-color .25s var(--ease);
}
/* Frosted only once the page has scrolled; at rest the hero shows through. */
.site-header.is-scrolled {
  background: rgba(11, 15, 20, .85);
  backdrop-filter: saturate(150%) blur(12px);
  -webkit-backdrop-filter: saturate(150%) blur(12px);
  border-bottom-color: var(--line-dark);
}

.site-header__inner {
  display: flex;
  align-items: center;
  gap: 1rem;
  min-height: var(--header-h);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: .65rem;
  color: #fff;
  text-decoration: none;
  font-weight: 700;
  letter-spacing: -.01em;
  margin-right: auto;
}
.brand__mark { width: auto; height: 1.9rem; }
.brand__name { font-size: 1.05rem; }

.site-nav { display: flex; align-items: center; gap: 1.75rem; }
.site-nav ul {
  display: flex;
  gap: 1.6rem;
  list-style: none;
  padding: 0;
}
.site-nav a:not(.btn) {
  color: rgba(255, 255, 255, .82);
  text-decoration: none;
  font-size: .95rem;
  font-weight: 500;
  padding-block: .35rem;
  border-bottom: 2px solid transparent;
  transition: color .16s var(--ease), border-color .16s var(--ease);
}
.site-nav a:not(.btn):hover { color: #fff; border-bottom-color: var(--cyan); }

.nav-toggle {
  display: none;
  width: 2.6rem; height: 2.6rem;
  align-items: center; justify-content: center;
  background: transparent;
  border: 1px solid var(--line-dark);
  border-radius: var(--radius-sm);
  cursor: pointer;
}
.nav-toggle__bars,
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  display: block;
  width: 1.15rem; height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: transform .2s var(--ease), opacity .2s var(--ease);
}
.nav-toggle__bars::before,
.nav-toggle__bars::after { content: ""; position: absolute; }
.nav-toggle__bars::before { transform: translateY(-6px); }
.nav-toggle__bars::after  { transform: translateY(6px); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after  { transform: rotate(-45deg); }

/* --- hero --------------------------------------------------------------- */
.hero {
  position: relative;
  isolation: isolate;
  color: #fff;
  background: var(--ink);
  overflow: hidden;
  /* sit underneath the sticky header so the transparent bar reads as part of the hero */
  margin-top: calc(var(--header-h) * -1);
}
.hero__media { position: absolute; inset: 0; z-index: -1; }
.hero__media img {
  width: 100%; height: 100%;
  object-fit: cover;
  opacity: .55;
}
.hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, .04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .04) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 70% 60% at 18% 32%, #000 0%, transparent 68%);
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 18% 32%, #000 0%, transparent 68%);
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(60% 60% at 12% 8%, rgba(37, 170, 225, .22), transparent 70%),
    linear-gradient(180deg, rgba(11, 15, 20, .55) 0%, rgba(11, 15, 20, .82) 55%, var(--ink) 100%);
}

.hero__inner {
  position: relative;
  padding-block: calc(var(--header-h) + clamp(3.75rem, 10vw, 7.5rem)) clamp(4.5rem, 11vw, 7.5rem);
}
.hero h1 {
  font-size: clamp(2rem, 5.4vw, 3.6rem);
  letter-spacing: -.03em;
  max-width: 20ch;
}
.hero__lead {
  margin-top: 1.5rem;
  max-width: 44rem;
  font-size: clamp(1.05rem, 1.6vw, 1.2rem);
  color: #cdd7e1;
}
.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .9rem;
  margin-top: 2.25rem;
}

/* --- pillars ------------------------------------------------------------ */
.pillars {
  list-style: none;
  padding: 0;
  display: grid;
  gap: clamp(2.5rem, 6vw, 4.5rem);
}

.pillar {
  display: grid;
  gap: clamp(1.5rem, 4vw, 3.25rem);
  align-items: center;
}
@media (min-width: 900px) {
  .pillar { grid-template-columns: 1fr 1fr; }
  .pillar--flip .pillar__media { order: 2; }
}

.pillar__media {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  background: var(--paper-2);
}
.pillar__media img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  transition: transform .5s var(--ease);
}
.pillar:hover .pillar__media img { transform: scale(1.03); }

.pillar__num {
  display: block;
  font-family: var(--font-mono);
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .12em;
  color: var(--cyan-ink);
  margin-bottom: .6rem;
}
.pillar__body h3 {
  font-size: clamp(1.4rem, 2.6vw, 1.9rem);
  margin-bottom: .7rem;
}
.pillar__body p { color: var(--muted); }

/* --- experience --------------------------------------------------------- */
.section--ink {
  background: var(--ink);
  color: #fff;
  position: relative;
  overflow: hidden;
}
.section--ink::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(50% 60% at 85% 15%, rgba(37, 170, 225, .18), transparent 70%);
  pointer-events: none;
}
.experience {
  position: relative;
  display: grid;
  gap: clamp(1.75rem, 5vw, 4rem);
}
@media (min-width: 900px) { .experience { grid-template-columns: 1fr 1fr; } }
.experience h2 { font-size: clamp(1.75rem, 4vw, 2.6rem); max-width: 16ch; }
.experience__lead { font-size: clamp(1.05rem, 1.6vw, 1.2rem); color: #cdd7e1; }

.stats {
  list-style: none;
  padding: 0;
  margin-top: 2.25rem;
  display: grid;
  gap: 1.25rem;
}
@media (min-width: 560px) { .stats { grid-template-columns: repeat(3, 1fr); } }
.stats li {
  padding-top: 1rem;
  border-top: 2px solid var(--cyan);
}
.stats strong {
  display: block;
  font-size: 1.6rem;
  letter-spacing: -.02em;
}
.stats span {
  font-size: .87rem;
  color: var(--muted-dark);
}

/* --- contact form ------------------------------------------------------- */
.contact { max-width: 46rem; margin-inline: auto; }

.form {
  display: grid;
  gap: 1.1rem;
  margin-top: 2.5rem;
  padding: clamp(1.4rem, 4vw, 2.5rem);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.form__row { display: grid; gap: 1.1rem; }
@media (min-width: 620px) { .form__row { grid-template-columns: 1fr 1fr; } }

.field { display: grid; gap: .4rem; }
.field label {
  font-size: .87rem;
  font-weight: 600;
  letter-spacing: .01em;
}
.field input,
.field textarea {
  width: 100%;
  padding: .78rem .9rem;
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  transition: border-color .16s var(--ease), background-color .16s var(--ease),
              box-shadow .16s var(--ease);
}
.field textarea { resize: vertical; min-height: 8rem; }
.field input:hover, .field textarea:hover { border-color: #c9d4de; }
.field input:focus, .field textarea:focus {
  outline: none;
  background: var(--paper);
  border-color: var(--cyan);
  box-shadow: 0 0 0 4px var(--cyan-soft);
}
.field input[aria-invalid="true"],
.field textarea[aria-invalid="true"] {
  border-color: #d64545;
  box-shadow: 0 0 0 4px #fdecec;
}

/* honeypot — off-screen, never focusable, never shown to humans */
.hp {
  position: absolute;
  left: -9999px;
  width: 1px; height: 1px;
  overflow: hidden;
}

/* Turnstile sits between the fields and the submit row. It renders inside an
   iframe of its own, so only the spacing is ours to set. */
.cf-turnstile { margin-top: .2rem; }
.cf-turnstile iframe { max-width: 100%; }

.form__foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem 1.25rem;
  margin-top: .3rem;
}
.form__note { font-size: .9rem; color: var(--muted); }
.form__note a { color: var(--cyan-ink); }

.form__privacy {
  font-size: .85rem;
  color: var(--muted);
  padding-top: .35rem;
  border-top: 1px solid var(--line);
}

.req { color: var(--cyan-ink); }

.form__status { font-size: .95rem; font-weight: 500; }
.form__status:empty { display: none; }
.form__status[data-state="ok"] { color: #146c43; }
.form__status[data-state="error"] { color: #b42318; }

/* --- footer ------------------------------------------------------------- */
.site-footer {
  background: var(--ink-2);
  color: var(--muted-dark);
  padding-block: clamp(2.5rem, 5vw, 3.5rem);
  font-size: .92rem;
}
.site-footer__inner {
  display: grid;
  gap: 1.75rem;
  justify-items: start;
}
@media (min-width: 780px) {
  .site-footer__inner {
    grid-template-columns: 1fr auto;
    align-items: center;
    justify-items: start;
  }
  .site-footer__legal { grid-column: 1 / -1; }
}
.site-footer__brand { display: flex; align-items: center; gap: .9rem; }
.site-footer__mark { width: auto; height: 2.25rem; }
.site-footer__name { color: #fff; font-weight: 600; }
.site-footer__tag { font-size: .87rem; }

.socials {
  display: flex;
  gap: .6rem;
  list-style: none;
  padding: 0;
}
.socials a {
  display: grid;
  place-items: center;
  width: 2.5rem; height: 2.5rem;
  border: 1px solid var(--line-dark);
  border-radius: 50%;
  color: #fff;
  transition: background-color .18s var(--ease), border-color .18s var(--ease),
              transform .18s var(--ease);
}
.socials svg { width: 1.05rem; height: 1.05rem; }
.socials a:hover {
  background: var(--cyan);
  border-color: var(--cyan);
  color: #041f2c;
  transform: translateY(-2px);
}

.site-footer__legal { font-size: .85rem; color: #a3b0be; padding-top: 1rem; border-top: 1px solid var(--line-dark); width: 100%; }

/* --- 404 ---------------------------------------------------------------- */
.center-page {
  min-height: 100dvh;
  display: grid;
  place-content: center;
  text-align: center;
  gap: 1rem;
  padding: 2rem;
}
.center-page h1 { font-size: clamp(2rem, 6vw, 3.25rem); }
.center-page p { color: var(--muted); }

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

  .site-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    bottom: 0;
    display: grid;
    align-content: start;
    gap: 1.25rem;
    padding: 1.5rem clamp(1.1rem, 4vw, 2rem) 2rem;
    background: var(--ink);
    overflow-y: auto;
    overscroll-behavior: contain;
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: opacity .18s var(--ease), transform .18s var(--ease), visibility .18s;
  }
  .site-nav.is-open { opacity: 1; visibility: visible; transform: translateY(0); }
  .site-nav ul { flex-direction: column; gap: .25rem; }
  .site-nav a:not(.btn) {
    display: block;
    padding: .85rem 0;
    font-size: 1.15rem;
    border-bottom: 1px solid var(--line-dark);
  }
  .site-nav .btn { justify-self: start; margin-top: .5rem; }

  /* keep the page behind the panel from scrolling */
  body.nav-open { overflow: hidden; }
}

/* --- motion / print ----------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    transition-duration: .001ms !important;
  }
}

@media print {
  .site-header, .hero__media, .site-footer, .form { display: none; }
  .hero { color: #000; background: none; }
  .hero::after { display: none; }
  .pillar { break-inside: avoid; }
}