/* ============================================================================
   Challenge Me SRL — landing styles.
   No build step: this file is hand-authored and shipped as written.
   ============================================================================ */

:root {
  --bg:        #07090E;
  --bg-soft:   #0C1017;
  --bg-card:   rgba(18, 24, 36, 0.62);
  --line:      rgba(150, 172, 214, 0.16);
  --line-hi:   rgba(150, 172, 214, 0.34);
  --ink:       #E9EDF5;
  --ink-mid:   #A9B5CC;
  --ink-dim:   #6E7B94;
  --cyan:      #2FE8D5;
  --magenta:   #FF3D8A;
  --amber:     #FFB020;

  --sans: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto,
          "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", "Fira Code", Menlo,
          Consolas, monospace;

  --wrap: 1180px;
  --pad:  clamp(20px, 5vw, 48px);
  --r:    14px;
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3, h4 { margin: 0; line-height: 1.1; letter-spacing: -0.022em; font-weight: 650; }
p  { margin: 0; }
dl, dd, dt, ol, ul, li { margin: 0; padding: 0; }
li { list-style: none; }
a  { color: inherit; text-decoration: none; }
img, svg, canvas { display: block; max-width: 100%; }

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

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 var(--pad); }

.skip {
  position: fixed; top: -100px; left: 12px; z-index: 100;
  background: var(--cyan); color: #04140F; padding: 10px 16px; border-radius: 8px;
  font: 600 13px/1 var(--mono);
}
.skip:focus { top: 12px; }

/* ---------- background simulation ---------- */
.bg-graph {
  position: fixed; inset: 0; width: 100%; height: 100%;
  z-index: 0; pointer-events: none;
}
.bg-scrim {
  position: fixed; inset: 0; z-index: 1; pointer-events: none;
  background:
    radial-gradient(120% 80% at 12% 0%,   rgba(7, 9, 14, 0.94) 0%, rgba(7, 9, 14, 0.55) 46%, rgba(7, 9, 14, 0.2) 74%),
    linear-gradient(180deg, rgba(7, 9, 14, 0.42) 0%, rgba(7, 9, 14, 0.78) 100%);
}
.nav, main, .foot { position: relative; z-index: 2; }

/* ---------- nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  border-bottom: 1px solid transparent;
  transition: background .25s ease, border-color .25s ease, backdrop-filter .25s ease;
}
.nav.is-stuck {
  background: rgba(7, 9, 14, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom-color: var(--line);
}
.nav-in { display: flex; align-items: center; gap: 20px; height: 68px; }

.brand { display: inline-flex; align-items: center; gap: 11px; flex: 0 0 auto; }
.brand-mark { width: 28px; height: 28px; overflow: visible; }
.brand-mark line   { stroke: var(--line-hi); stroke-width: 1.4; }
.brand-mark circle { fill: var(--bg); stroke: var(--cyan); stroke-width: 1.8; }
.brand-mark circle:nth-of-type(3) { fill: var(--magenta); stroke: var(--magenta); }
.brand-text {
  font: 700 15px/1 var(--sans); letter-spacing: -0.01em;
  display: inline-flex; align-items: baseline; gap: 7px;
}
.brand-suffix { font: 500 10px/1 var(--mono); color: var(--ink-dim); letter-spacing: .08em; }

.nav-links { display: flex; gap: 26px; margin-left: auto; }
.nav-links a {
  font: 500 13.5px/1 var(--sans); color: var(--ink-mid);
  padding: 6px 0; position: relative; transition: color .18s ease;
}
.nav-links a::after {
  content: ""; position: absolute; left: 0; right: 100%; bottom: 0; height: 1px;
  background: var(--cyan); transition: right .22s ease;
}
.nav-links a:hover { color: var(--ink); }
.nav-links a:hover::after { right: 0; }

.nav-right { display: flex; align-items: center; gap: 12px; margin-left: auto; }
.nav-links + .nav-right { margin-left: 26px; }

.lang { display: inline-flex; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; }
.lang button {
  appearance: none; background: none; border: 0; cursor: pointer;
  font: 600 11px/1 var(--mono); letter-spacing: .06em;
  color: var(--ink-dim); padding: 7px 9px; transition: color .16s, background .16s;
}
.lang button:hover { color: var(--ink); }
.lang button[aria-current="true"] { background: rgba(47, 232, 213, 0.13); color: var(--cyan); }

.burger { display: none; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  border-radius: 10px; border: 1px solid transparent; cursor: pointer;
  font: 600 13.5px/1 var(--sans); padding: 12px 20px;
  transition: transform .16s ease, background .18s ease, border-color .18s ease, color .18s ease;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--cyan); color: #04140F; }
.btn-primary:hover { background: #55F2E1; }
.btn-ghost { border-color: var(--line-hi); color: var(--ink); background: rgba(255, 255, 255, 0.03); }
.btn-ghost:hover { border-color: var(--cyan); color: var(--cyan); }
.btn-sm { padding: 9px 14px; font-size: 12px; }

/* ---------- consent ---------- */
.consent {
  position: fixed; left: var(--pad); right: var(--pad); bottom: 16px; z-index: 90;
  background: var(--bg-soft); border: 1px solid var(--line-hi);
  border-radius: var(--r); box-shadow: 0 18px 44px rgba(0, 0, 0, 0.55);
}
.consent[hidden] { display: none; }
.consent-in {
  display: flex; align-items: center; gap: 18px; flex-wrap: wrap;
  max-width: var(--wrap); margin: 0 auto; padding: 14px 18px;
}
.consent-copy { flex: 1 1 320px; color: var(--ink-mid); font-size: 13px; line-height: 1.5; }
.consent-acts { display: flex; gap: 8px; margin-left: auto; }

@media (max-width: 560px) {
  .consent-acts { width: 100%; margin-left: 0; }
  .consent-acts .btn { flex: 1; }
}

/* ---------- section furniture ---------- */
.sec { padding: clamp(80px, 11vw, 140px) 0; }

/* The header is sticky and 68px tall; without this every nav anchor lands
   with its heading hidden behind it. */
section[id], span[id] { scroll-margin-top: 88px; }

.sec-label {
  display: flex; align-items: center; gap: 12px;
  font: 600 11px/1 var(--mono); letter-spacing: .18em; text-transform: uppercase;
  color: var(--ink-dim); margin-bottom: 20px;
}
.sec-label span:first-child { color: var(--cyan); }
.sec-label span:first-child::after {
  content: ""; display: inline-block; width: 28px; height: 1px;
  background: var(--line-hi); margin-left: 12px; vertical-align: middle;
}

.sec-h2 { font-size: clamp(28px, 4.4vw, 46px); max-width: 20ch; }
.sec-lead {
  margin-top: 18px; max-width: 62ch; color: var(--ink-mid);
  font-size: clamp(15px, 1.5vw, 17px);
}

.eyebrow {
  font: 600 11px/1.4 var(--mono); letter-spacing: .18em; text-transform: uppercase;
  color: var(--cyan);
}

/* ---------- hero ---------- */
.hero {
  min-height: min(94vh, 860px);
  display: flex; align-items: center;
  padding: 120px 0 90px;
  position: relative;
}
.hero-in { max-width: 900px; }
.hero-h1 {
  margin-top: 22px;
  font-size: clamp(38px, 7.4vw, 84px);
  line-height: 1.02; letter-spacing: -0.035em; font-weight: 700;
}
.hero-h1 em {
  font-style: normal;
  background: linear-gradient(96deg, var(--cyan) 0%, #8A6BFF 52%, var(--magenta) 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.lead {
  margin-top: 26px; max-width: 60ch; color: var(--ink-mid);
  font-size: clamp(16px, 1.8vw, 19px); line-height: 1.6;
}
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }

.hero-meta {
  display: flex; flex-wrap: wrap; gap: 14px 40px; margin-top: 56px;
  padding-top: 26px; border-top: 1px solid var(--line);
}
.hero-meta dt {
  font: 600 10px/1 var(--mono); letter-spacing: .16em; text-transform: uppercase;
  color: var(--ink-dim); margin-bottom: 7px;
}
.hero-meta dd { font: 500 14px/1 var(--mono); color: var(--ink); }

.scroll-hint {
  position: absolute; bottom: 34px; left: 50%; transform: translateX(-50%);
  width: 1px; height: 46px; background: var(--line-hi); overflow: hidden;
}
.scroll-hint span {
  display: block; width: 100%; height: 16px; background: var(--cyan);
  animation: drip 2.4s ease-in-out infinite;
}
@keyframes drip { 0% { transform: translateY(-20px); } 100% { transform: translateY(50px); } }

/* ---------- service cards ---------- */
.cards {
  display: grid; gap: 1px; margin-top: 54px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  background: var(--line); border: 1px solid var(--line); border-radius: var(--r);
  overflow: hidden;
}
@media (max-width: 1080px) { .cards { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 560px)  { .cards { grid-template-columns: minmax(0, 1fr); } }
.card {
  background: rgba(9, 12, 19, 0.86); padding: 28px 22px 30px;
  transition: background .22s ease;
}
.card:hover { background: rgba(20, 27, 41, 0.92); }
.card-n {
  font: 600 11px/1 var(--mono); letter-spacing: .16em; color: var(--cyan);
  margin-bottom: 16px;
}
.card h3 { font-size: 19px; margin-bottom: 11px; }
.card p { color: var(--ink-mid); font-size: 14.5px; line-height: 1.66; }

/* ---------- process ---------- */
.steps { margin-top: 50px; border-top: 1px solid var(--line); }
.step {
  display: grid; grid-template-columns: 56px minmax(0, 1fr) minmax(0, 0.95fr);
  gap: 24px; align-items: start;
  padding: 26px 0; border-bottom: 1px solid var(--line);
  transition: background .2s ease;
}
.step:hover { background: rgba(255, 255, 255, 0.018); }
.step-n { font: 600 12px/1.4 var(--mono); color: var(--cyan); letter-spacing: .1em; }
.step-body h3 { font-size: 20px; margin-bottom: 8px; }
.step-body p { color: var(--ink-mid); font-size: 14.5px; }
.step-meta {
  display: flex; flex-direction: column; gap: 10px; align-items: flex-start;
  color: var(--ink-dim); font-size: 13.5px;
}
.pill {
  font: 600 10.5px/1 var(--mono); letter-spacing: .1em; text-transform: uppercase;
  color: var(--magenta); border: 1px solid rgba(255, 61, 138, 0.35);
  border-radius: 999px; padding: 6px 11px; white-space: nowrap;
}

/* ---------- stack matrix ---------- */
.matrix { margin-top: 48px; border-top: 1px solid var(--line); }
.mrow {
  display: grid; grid-template-columns: 190px minmax(0, 1fr); gap: 24px;
  padding: 20px 0; border-bottom: 1px solid var(--line); align-items: baseline;
}
.mrow dt {
  font: 600 11px/1.4 var(--mono); letter-spacing: .16em; text-transform: uppercase;
  color: var(--ink-dim);
}
.mrow dd { display: flex; flex-wrap: wrap; gap: 8px; }
.mrow dd span {
  font: 500 12.5px/1 var(--mono); color: var(--ink);
  border: 1px solid var(--line); border-radius: 7px; padding: 8px 11px;
  background: rgba(255, 255, 255, 0.02);
  transition: border-color .18s ease, color .18s ease;
}
.mrow dd span:hover { border-color: var(--cyan); color: var(--cyan); }

/* ---------- case study ---------- */
.case {
  margin-top: 48px; border: 1px solid var(--line-hi); border-radius: var(--r);
  background: rgba(9, 12, 19, 0.78); padding: clamp(26px, 4vw, 44px);
}
.case-head { padding-bottom: 4px; }
.case-kicker {
  font: 600 10.5px/1 var(--mono); letter-spacing: .18em; text-transform: uppercase;
  color: var(--magenta); margin-bottom: 14px;
}
.case-title { font-size: clamp(30px, 4.6vw, 44px); letter-spacing: -0.03em; }
.case-one { margin-top: 12px; max-width: 56ch; color: var(--ink-mid); font-size: 16px; }
.link-out {
  display: inline-flex; align-items: center; gap: 8px; margin-top: 18px;
  font: 600 13px/1 var(--mono); color: var(--cyan);
  border-bottom: 1px solid rgba(47, 232, 213, 0.35); padding-bottom: 4px;
  transition: gap .18s ease;
}
.link-out:hover { gap: 13px; }

.case-next { text-align: center; }
.case-next h3 { font-size: 24px; }
.case-next p { margin: 12px auto 22px; max-width: 52ch; color: var(--ink-mid); font-size: 15px; }

/* ---------- contact ---------- */
.sec-contact { padding-bottom: clamp(90px, 12vw, 150px); }
.mail { display: flex; flex-wrap: wrap; align-items: center; gap: 16px; margin-top: 38px; }
.mail-link {
  font: 600 clamp(19px, 3.4vw, 34px)/1.15 var(--mono);
  letter-spacing: -0.02em; color: var(--ink);
  border-bottom: 2px solid rgba(47, 232, 213, 0.4); padding-bottom: 8px;
  word-break: break-word; transition: color .2s ease, border-color .2s ease;
}
.mail-link:hover { color: var(--cyan); border-bottom-color: var(--cyan); }
.mail-noscript a { color: var(--cyan); font-family: var(--mono); }
.cnt-meta { margin-top: 30px; color: var(--ink-dim); font: 500 13px/1.6 var(--mono); }
#copyMail.is-done { border-color: var(--cyan); color: var(--cyan); }

/* ---------- footer ---------- */
.foot { border-top: 1px solid var(--line); padding: 44px 0 56px; background: var(--bg-soft); }
.foot-in { display: flex; flex-wrap: wrap; gap: 30px 48px; align-items: flex-start; }
.foot-brand { display: flex; align-items: center; gap: 11px; font: 600 14px/1 var(--sans); }
.foot-legal { display: flex; flex-wrap: wrap; gap: 18px 34px; margin-left: auto; }
.foot-legal dt {
  font: 600 9.5px/1 var(--mono); letter-spacing: .16em; text-transform: uppercase;
  color: var(--ink-dim); margin-bottom: 6px;
}
.foot-legal dd { font: 500 12.5px/1.4 var(--mono); color: var(--ink-mid); }
.foot-copy { width: 100%; color: var(--ink-dim); font: 500 12px/1 var(--mono); }
.foot-copy #year::before { content: "© "; }

/* ---------- reveal ---------- */
.rv { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.rv.is-in { opacity: 1; transform: none; }

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  .nav-in { gap: 12px; }
  /* .nav-links is display:none here but still matches the adjacent-sibling rule
     above, which would replace the auto margin with a fixed 26px and push the
     controls past the viewport edge. */
  .nav-links + .nav-right { margin-left: auto; }
  .nav-links { display: none; }
  .nav-links.is-open {
    display: flex; flex-direction: column; gap: 0;
    position: absolute; top: 68px; left: 0; right: 0;
    background: rgba(7, 9, 14, 0.97); backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--line); padding: 8px var(--pad) 18px;
  }
  .nav-links.is-open a { padding: 13px 0; border-bottom: 1px solid var(--line); font-size: 15px; }
  .nav-cta { display: none; }
  .burger {
    display: inline-flex; flex-direction: column; justify-content: center; gap: 5px;
    width: 38px; height: 34px; padding: 0 8px; cursor: pointer;
    background: none; border: 1px solid var(--line); border-radius: 8px;
  }
  .burger span { display: block; height: 1.5px; background: var(--ink); transition: transform .2s ease, opacity .2s ease; }
  .burger[aria-expanded="true"] span:first-child { transform: translateY(3.2px) rotate(45deg); }
  .burger[aria-expanded="true"] span:last-child  { transform: translateY(-3.2px) rotate(-45deg); }

  .step { grid-template-columns: 40px minmax(0, 1fr); }
  .step-meta { grid-column: 2; flex-direction: row; flex-wrap: wrap; align-items: center; gap: 12px; }
  .mrow { grid-template-columns: minmax(0, 1fr); gap: 12px; }
  .foot-legal { margin-left: 0; }
}

@media (max-width: 480px) {
  .brand-suffix { display: none; }
  .brand-text { font-size: 14px; }
  .lang button { padding: 7px 7px; }
  .hero { min-height: auto; padding: 96px 0 72px; }
  .hero-meta { gap: 16px 26px; }
  .readouts { grid-template-columns: 1fr 1fr; }
  .case { padding: 22px 18px 26px; }
  .mail-link { border-bottom-width: 1px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important; animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  .rv { opacity: 1; transform: none; }
  .scroll-hint { display: none; }
}