/* ============================================================
   Xiontech — brand system (see CLAUDE.md design direction)
   Dark-first. One accent. Hairline grid. The blade at 63.4°.
   ============================================================ */

:root {
  --void:       #0A0E16;
  --void-raise: #111726;
  --line:       #232B3D;
  --signal:     #4D8DFF;
  --text:       #E8ECF4;
  --text-dim:   #8B96AC;

  --font-display: 'Space Grotesk', 'Plex Sans Fb', sans-serif;
  --font-body:    'IBM Plex Sans', 'Plex Sans Fb', sans-serif;
  --font-mono:    'IBM Plex Mono', 'Plex Mono Fb', monospace;

  /* the blade: 1:2 box ratio = 63.4° diagonal, derived from the X mark */
  --blade-w: 14px;
  --blade-h: 28px;
}

/* metric-compatible fallbacks — no layout shift while webfonts load */
@font-face { font-family: 'Plex Sans Fb'; src: local('Arial'); size-adjust: 104%; ascent-override: 100%; }
@font-face { font-family: 'Plex Mono Fb'; src: local('Courier New'); size-adjust: 106%; }

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--void);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { font-family: var(--font-display); line-height: 1.15; margin: 0 0 1rem; }
h1 { font-size: clamp(2.4rem, 5.5vw, 4rem); font-weight: 700; letter-spacing: -0.02em; max-width: 21ch; }
h2 { font-size: clamp(1.6rem, 3vw, 2.25rem); font-weight: 600; letter-spacing: -0.015em; }
h3, .h3 { font-size: 1.25rem; font-weight: 600; letter-spacing: -0.01em; font-family: var(--font-display); }

p { margin: 0 0 1rem; }
img { max-width: 100%; }
a { color: var(--signal); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

.mono { font-family: var(--font-mono); }
.dim { color: var(--text-dim); }

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

.visually-hidden {
  position: absolute; width: 1px; height: 1px; margin: -1px;
  clip-path: inset(50%); overflow: hidden; white-space: nowrap;
}

.skip-link {
  position: absolute; left: 1rem; top: -3rem; z-index: 100;
  background: var(--void-raise); border: 1px solid var(--line);
  padding: .5rem 1rem; transition: top 150ms;
}
.skip-link:focus { top: 1rem; }

.wrap { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.wrap.narrow { max-width: 780px; }

/* ---------------------------------------------------------- the blade */

.blade, .eyebrow::before {
  display: inline-block;
  width: var(--blade-w); height: var(--blade-h);
  background: linear-gradient(to top right,
    transparent calc(50% - 0.6px), var(--signal) calc(50% - 0.5px),
    var(--signal) calc(50% + 0.5px), transparent calc(50% + 0.6px));
}

.eyebrow {
  display: flex; align-items: center; gap: .75rem;
  font-family: var(--font-mono);
  font-size: .78rem; font-weight: 500;
  letter-spacing: .14em;
  color: var(--text-dim);
  text-transform: uppercase;
  margin: 0 0 1.25rem;
}
.eyebrow::before { content: ''; width: 8px; height: 16px; flex: none; }

/* ---------------------------------------------------------- header */

.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--void-raise) 92%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.header-inner { display: flex; align-items: center; justify-content: space-between; min-height: 68px; }

.brand img { display: block; width: 150px; height: auto; }

.nav-menu { display: flex; align-items: center; gap: 2rem; }
.nav-menu > a {
  color: var(--text); font-size: .95rem; font-weight: 500;
}
.nav-menu > a:hover { color: var(--signal); text-decoration: none; }
.nav-menu > a[aria-current="page"] { color: var(--signal); }

.lang-switch { display: flex; gap: .6rem; font-family: var(--font-mono); font-size: .8rem; }
.lang-switch a { color: var(--text-dim); }
.lang-switch a:hover { color: var(--signal); text-decoration: none; }
.lang-current { color: var(--text); border-bottom: 1px solid var(--signal); }

.nav-toggle { display: none; }

/* ---------------------------------------------------------- buttons */

.btn {
  display: inline-block;
  font-family: var(--font-body); font-weight: 600; font-size: .95rem;
  padding: .8rem 1.6rem;
  border-radius: 4px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 150ms, border-color 150ms, color 150ms;
}
.btn:hover { text-decoration: none; }

.btn-primary { background: var(--signal); color: var(--void); }
.btn-primary:hover { background: #6BA0FF; }

.btn-ghost { border-color: var(--line); color: var(--text); background: transparent; }
.btn-ghost:hover { border-color: var(--signal); color: var(--signal); }

.nav-cta { padding: .55rem 1.1rem; font-size: .875rem; }

/* ---------------------------------------------------------- sections */

.section { padding: 88px 0; border-top: 1px solid var(--line); }

.hero { padding: 96px 0 72px; }
.hero .lede { margin-top: .25rem; }

.page-head { padding: 88px 0 24px; }
.section-tall { padding: 120px 0; }

.lede { font-size: 1.2rem; color: var(--text-dim); max-width: 62ch; }

.cta-row { display: flex; flex-wrap: wrap; gap: 1rem; margin: 2rem 0 0; }

/* ---------------------------------------------------------- hero diagram */

.flow-diagram { margin: 4.5rem 0 0; }
.flow-diagram svg { width: 100%; height: auto; display: block; }
.flow-diagram figcaption { font-size: .8rem; letter-spacing: .06em; margin-top: 1rem; }

.node-box { fill: var(--void-raise); stroke: var(--line); stroke-width: 1; }
.node-box-signal { stroke: var(--signal); }

.node-label {
  font-family: var(--font-mono); font-size: 10.5px; font-weight: 500;
  letter-spacing: .05em; fill: var(--text);
}
.node-label-signal { fill: var(--signal); }

.node-sub { font-family: var(--font-mono); font-size: 9.5px; fill: var(--text-dim); letter-spacing: .04em; }
.node-sub-signal { fill: var(--signal); }

.link-line { stroke: var(--line); stroke-width: 1; }
.link-dot { fill: var(--signal); }

@media (prefers-reduced-motion: no-preference) {
  .flow-node { opacity: 0; animation: node-in 400ms ease-out forwards; animation-delay: var(--d, 0ms); }
  .flow-link .link-line {
    stroke-dasharray: 60; stroke-dashoffset: 60;
    animation: line-draw 350ms ease-out forwards; animation-delay: var(--d, 0ms);
  }
  .flow-link .link-dot { opacity: 0; animation: node-in 250ms ease-out forwards; animation-delay: calc(var(--d, 0ms) + 200ms); }
}

@keyframes node-in { to { opacity: 1; } }
@keyframes line-draw { to { stroke-dashoffset: 0; } }

/* mobile vertical variant of the flow */
.flow-mobile { display: none; }

/* ---------------------------------------------------------- cards */

.card-grid {
  display: grid; gap: 1px;
  grid-template-columns: repeat(2, 1fr);
  background: var(--line);            /* hairline grid between cards */
  border: 1px solid var(--line);
  margin-top: 2.5rem;
}

.card {
  position: relative;
  display: flex; flex-direction: column; gap: .25rem;
  background: var(--void-raise);
  color: var(--text);
  padding: 2rem 1.75rem 1.75rem;
  transition: background-color 150ms;
}
.card:hover { text-decoration: none; background: #141B2D; }

.card::after {
  /* hover blade in the corner — same 63.4° angle */
  content: ''; position: absolute; top: 14px; right: 16px;
  width: 9px; height: 18px; opacity: 0;
  background: linear-gradient(to top right,
    transparent calc(50% - 0.6px), var(--signal) calc(50% - 0.5px),
    var(--signal) calc(50% + 0.5px), transparent calc(50% + 0.6px));
  transition: opacity 150ms;
}
.card:hover::after { opacity: 1; }

.card-eyebrow { font-size: .72rem; letter-spacing: .12em; color: var(--text-dim); margin: 0 0 .75rem; }
.card h3, .card .h3 { margin-bottom: .5rem; }
.card p.dim { font-size: .95rem; flex: 1; }
.card-more { font-size: .8rem; color: var(--signal); margin-top: 1rem; }

/* ---------------------------------------------------------- credibility strip */

.cred-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px;
  background: var(--line); border: 1px solid var(--line);
  margin-top: 2rem;
}
.cred-item { background: var(--void); padding: 2rem 1.75rem; display: flex; flex-direction: column; gap: .5rem; }
.cred-value { font-size: 2rem; font-weight: 500; color: var(--signal); letter-spacing: .02em; }
.cred-label { font-size: .92rem; line-height: 1.5; }

/* ---------------------------------------------------------- steps */

.steps {
  list-style: none; counter-reset: none;
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 2.5rem;
  padding: 0; margin: 2.5rem 0 0;
}
.step { border-top: 1px solid var(--line); padding-top: 1.5rem; }
.step-num { display: block; color: var(--signal); font-size: .85rem; margin-bottom: 1rem; }
.step h3 { margin-bottom: .5rem; }
.step p { font-size: .95rem; margin: 0; }

/* ---------------------------------------------------------- before / after */

.ba-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: var(--line); border: 1px solid var(--line); }
.ba-panel { background: var(--void-raise); padding: 2rem 1.75rem; }
.ba-panel p:last-child { margin: 0; font-size: 1rem; color: var(--text-dim); }
.ba-after { background: var(--void); }
.ba-after p:last-child { color: var(--text); }
.ba-label { font-size: .75rem; letter-spacing: .14em; margin-bottom: 1rem; }
.ba-after .ba-label { color: var(--signal); }

/* ---------------------------------------------------------- feature lists */

.feature-list {
  list-style: none; padding: 0;
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 2rem 3rem;
  margin: 2.5rem 0 0;
}
.feature { border-top: 1px solid var(--line); padding-top: 1.25rem; }
.feature h3 { font-size: 1.05rem; margin-bottom: .35rem; }
.feature p { font-size: .95rem; margin: 0; }

/* ---------------------------------------------------------- why page */

.story { font-size: 1.15rem; line-height: 1.8; margin-bottom: 1.5rem; }

/* ---------------------------------------------------------- CTA band */

.cta-band { text-align: left; }
.cta-band h2 { max-width: 24ch; }
.cta-band .dim { max-width: 60ch; margin-bottom: 2rem; }

/* ---------------------------------------------------------- contact */

.contact-grid { display: grid; grid-template-columns: 1.6fr 1fr; gap: 4rem; align-items: start; }

.field { margin-bottom: 1.25rem; display: flex; flex-direction: column; gap: .4rem; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; }

.field label { font-family: var(--font-mono); font-size: .78rem; letter-spacing: .08em; color: var(--text-dim); text-transform: uppercase; }

.field input, .field textarea {
  width: 100%;
  min-width: 0;
  background: var(--void-raise);
  border: 1px solid var(--line);
  border-radius: 4px;
  color: var(--text);
  font-family: var(--font-body); font-size: 1rem;
  padding: .75rem .9rem;
}
.field input:focus, .field textarea:focus { outline: none; border-color: var(--signal); }
.field ::placeholder { color: #5B6478; }

.hp-field { position: absolute; left: -9999px; top: auto; }

.form-note { padding: 1rem 1.25rem; border: 1px solid var(--line); border-radius: 4px; font-size: .9rem; }
.form-ok { border-color: var(--signal); color: var(--signal); }
.form-err { border-color: #C4584D; color: #E08A81; }

.contact-direct { border-top: 1px solid var(--line); padding-top: 1.5rem; }
.contact-email { display: inline-block; font-size: 1.05rem; margin: .25rem 0 1.5rem; }
.booking-label { margin-top: 1rem; }

/* ---------------------------------------------------------- footer */

.site-footer { border-top: 1px solid var(--line); margin-top: 88px; padding: 56px 0 40px; }

.footer-inner {
  display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 3rem; align-items: start;
}
.footer-brand img { width: 130px; height: auto; margin-bottom: 1rem; }
.footer-brand p { font-size: .8rem; letter-spacing: .05em; }

.footer-nav { display: flex; flex-direction: column; gap: .6rem; }
.footer-nav a { color: var(--text-dim); font-size: .95rem; }
.footer-nav a:hover { color: var(--signal); text-decoration: none; }

.footer-contact { display: flex; flex-direction: column; gap: .5rem; font-size: .9rem; }
.footer-contact .dim { font-size: .75rem; letter-spacing: .1em; text-transform: uppercase; }

.footer-legal { margin-top: 3rem; }
.footer-legal .blade { width: 8px; height: 16px; margin-bottom: .75rem; }
.footer-legal p { font-size: .85rem; margin: 0; }

/* ---------------------------------------------------------- reveal on scroll */

@media (prefers-reduced-motion: no-preference) {
  .reveal { opacity: 0; transform: translateY(14px); transition: opacity 200ms ease-out, transform 200ms ease-out; }
  .reveal.in { opacity: 1; transform: none; }
}

/* ---------------------------------------------------------- responsive */

@media (max-width: 960px) {
  .card-grid { grid-template-columns: 1fr; }
  .cred-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; gap: 1.75rem; }
  .ba-grid { grid-template-columns: 1fr; }
  .feature-list { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; gap: 3rem; }
  .footer-inner { grid-template-columns: 1fr; gap: 2rem; }
}

@media (max-width: 760px) {
  .section, .hero, .page-head { padding-top: 56px; padding-bottom: 56px; }
  .page-head { padding-bottom: 8px; }

  /* hero diagram: switch to the vertical variant */
  .flow-diagram svg { display: none; }
  .flow-mobile {
    display: block; list-style: none; margin: 0; padding: 0;
  }
  .flow-mobile li {
    position: relative;
    border: 1px solid var(--line); border-radius: 4px;
    background: var(--void-raise);
    padding: .8rem 1rem;
    margin-bottom: 1.5rem;
    font-size: .8rem; letter-spacing: .05em;
  }
  .flow-mobile li::after {
    content: ''; position: absolute; left: 24px; bottom: -1.5rem;
    width: 1px; height: 1.5rem; background: var(--line);
  }
  .flow-mobile li:last-child::after { display: none; }
  .flow-mobile .fm-sub { display: block; color: var(--text-dim); font-size: .72rem; margin-top: .15rem; }
  .flow-mobile .fm-signal, .flow-mobile .fm-signal .fm-sub { color: var(--signal); }

  /* mobile nav */
  .nav-toggle {
    display: flex; flex-direction: column; gap: 5px;
    background: none; border: 1px solid var(--line); border-radius: 4px;
    padding: 10px 9px; cursor: pointer;
  }
  .nav-toggle-bar { display: block; width: 18px; height: 1.5px; background: var(--text); }

  .nav-menu {
    display: none;
    position: absolute; left: 0; right: 0; top: 68px;
    flex-direction: column; align-items: flex-start; gap: 1.25rem;
    background: var(--void-raise);
    border-bottom: 1px solid var(--line);
    padding: 1.5rem 24px 2rem;
  }
  .nav-menu.open { display: flex; }
}

@media (max-width: 560px) {
  .field-row { grid-template-columns: 1fr; gap: 0; }
}

@media (max-width: 400px) {
  .brand img { width: 124px; }
  .wrap { padding: 0 18px; }
}