/* ============================================================
   SifrByte — styles.css
   Concept: void (zero) + cipher (terminal) + editorial type
   ============================================================ */

/* ---------- Tokens ---------- */
:root {
  --void:      #09090B;
  --surface:   #101013;
  --surface-2: #16161A;
  --ink:       #ECEDEF;
  --muted:     #8A8F98;
  --dim:       #5A5E66;
  --line:      rgba(255,255,255,0.08);
  --line-2:    rgba(255,255,255,0.14);
  --signal:    #C6F24E;   /* phosphor lime — the atom of code */
  --signal-d:  #9FD400;

  --maxw: 1200px;
  --gut: clamp(20px, 5vw, 64px);
  --radius: 18px;

  --f-display: "Space Grotesk", system-ui, sans-serif;
  --f-body: "Inter", system-ui, sans-serif;
  --f-mono: "JetBrains Mono", ui-monospace, monospace;

  --ease: cubic-bezier(.2,.7,.2,1);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  font-family: var(--f-body);
  background: var(--void);
  color: var(--ink);
  line-height: 1.6;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: 0; background: none; color: inherit; }
input, textarea, select { font: inherit; color: inherit; }
ul { list-style: none; padding: 0; }

/* ---------- Helpers ---------- */
.mono { font-family: var(--f-mono); }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.ar { font-family: var(--f-display); unicode-bidi: isolate; }
.accent { color: var(--signal); }
.eyebrow {
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--muted);
  display: inline-flex;
  align-items: center;
  gap: 9px;
}
.eyebrow .dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 10px var(--signal);
}
.section__title {
  font-family: var(--f-display);
  font-weight: 600;
  font-size: clamp(30px, 5vw, 52px);
  line-height: 1.05;
  letter-spacing: -.02em;
  margin-top: 18px;
}
.lede { font-size: clamp(18px, 2vw, 21px); color: var(--ink); margin: 16px 0; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 13px 22px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 15px;
  letter-spacing: -.01em;
  transition: transform .25s var(--ease), background .25s var(--ease), color .25s var(--ease), border-color .25s var(--ease);
  border: 1px solid transparent;
  white-space: nowrap;
}
.btn .arr { transition: transform .25s var(--ease); }
.btn:hover .arr { transform: translateX(3px); }
.btn--signal { background: var(--signal); color: #0B0C00; }
.btn--signal:hover { background: #d4ff5e; transform: translateY(-2px); }
.btn--ghost { border-color: var(--line-2); color: var(--ink); }
.btn--ghost:hover { border-color: var(--ink); transform: translateY(-2px); }
.btn--block { width: 100%; justify-content: center; }

/* ---------- Layout ---------- */
.section {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(70px, 12vw, 140px) var(--gut);
}
.section--alt { max-width: none; background: var(--surface); }
.section--alt > * { max-width: var(--maxw); margin-left: auto; margin-right: auto; }
.section__head { margin-bottom: clamp(40px, 6vw, 64px); }

/* ---------- Nav ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  transition: background .3s var(--ease), border-color .3s var(--ease), backdrop-filter .3s;
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: rgba(9,9,11,.72);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom-color: var(--line);
}
.nav__inner {
  max-width: var(--maxw); margin: 0 auto;
  height: 70px;
  padding: 0 var(--gut);
  display: flex; align-items: center; gap: 24px;
}
.logo { display: inline-flex; align-items: center; gap: 10px; font-family: var(--f-display); font-weight: 700; font-size: 19px; letter-spacing: -.02em; }
.logo__mark { width: 26px; height: 26px; flex: none; }
.logo__b { color: var(--muted); font-weight: 400; }
.nav__links { display: flex; gap: 28px; margin-left: auto; }
.nav__links a { font-size: 15px; color: var(--muted); transition: color .2s; position: relative; }
.nav__links a:hover { color: var(--ink); }
.nav__links a::after { content: ""; position: absolute; left: 0; bottom: -6px; width: 0; height: 1px; background: var(--signal); transition: width .25s var(--ease); }
.nav__links a:hover::after { width: 100%; }
.nav__cta { margin-left: 0; }
.nav__burger { display: none; flex-direction: column; gap: 5px; margin-left: auto; padding: 8px; }
.nav__burger span { width: 22px; height: 2px; background: var(--ink); border-radius: 2px; transition: transform .3s var(--ease), opacity .3s; }
.nav__burger.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__burger.is-open span:nth-child(2) { opacity: 0; }
.nav__burger.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-menu {
  position: fixed; inset: 70px 0 auto 0; z-index: 99;
  background: var(--void); border-bottom: 1px solid var(--line);
  padding: 24px var(--gut) 32px;
  display: flex; flex-direction: column; gap: 18px;
  transform: translateY(-12px); opacity: 0; pointer-events: none;
  transition: transform .3s var(--ease), opacity .3s var(--ease);
}
.mobile-menu.is-open { transform: translateY(0); opacity: 1; pointer-events: auto; }
.mobile-menu a:not(.btn) { font-size: 20px; font-family: var(--f-display); font-weight: 500; }
.mobile-menu .btn { justify-content: center; margin-top: 8px; }

/* ---------- Hero ---------- */
.hero { padding-top: calc(70px + clamp(50px, 9vw, 120px)); position: relative; }
.hero__grid {
  max-width: var(--maxw); margin: 0 auto;
  padding: 0 var(--gut) clamp(40px, 7vw, 80px);
  display: grid; grid-template-columns: 1.15fr .85fr; gap: clamp(30px, 5vw, 72px); align-items: center;
}
.hero__title {
  font-family: var(--f-display); font-weight: 700;
  font-size: clamp(40px, 7.2vw, 84px);
  line-height: .98; letter-spacing: -.035em;
  margin: 22px 0 24px;
}
.hero__title .accent { display: block; }
.hero__sub { font-size: clamp(17px, 1.6vw, 20px); color: var(--muted); max-width: 46ch; }
.hero__cta { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 34px; }
.hero__stats { display: flex; gap: clamp(24px, 4vw, 52px); margin-top: clamp(40px, 6vw, 64px); padding-top: 28px; border-top: 1px solid var(--line); }
.hero__stats li { display: flex; flex-direction: column; }
.hero__stats strong { font-family: var(--f-display); font-size: clamp(24px, 3vw, 32px); font-weight: 600; letter-spacing: -.02em; }
.hero__stats span { font-family: var(--f-mono); font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: .08em; }

/* hero visual — the zero */
.hero__visual { display: grid; place-items: center; min-height: 360px; }
.zero { position: relative; width: min(100%, 420px); aspect-ratio: 1; }
.zero__ring {
  position: absolute; inset: 0; border-radius: 50%;
  border: 1px solid var(--line-2);
  background:
    radial-gradient(circle at 50% 50%, rgba(198,242,78,.06), transparent 62%),
    conic-gradient(from 220deg, transparent 0 60%, rgba(198,242,78,.22) 78%, transparent 92%);
  animation: spin 26s linear infinite;
}
.zero__core {
  position: absolute; inset: 18%; border-radius: 50%;
  border: 1px solid var(--line);
  background: radial-gradient(circle at 50% 40%, var(--surface-2), var(--void) 75%);
  display: grid; place-items: center; gap: 2px;
  box-shadow: inset 0 0 60px rgba(0,0,0,.6);
}
.zero__ar { font-family: var(--f-display); font-size: clamp(46px, 9vw, 86px); font-weight: 600; color: var(--ink); line-height: 1; }
.zero__num { font-family: var(--f-mono); font-size: 18px; color: var(--signal); }
.zero__tag {
  position: absolute; font-family: var(--f-mono); font-size: 11px;
  color: var(--muted); background: var(--void); padding: 4px 8px; border: 1px solid var(--line); border-radius: 999px;
  white-space: nowrap;
}
.zero__tag--t { top: -8px; left: 50%; transform: translateX(-50%); }
.zero__tag--r { top: 50%; right: -10px; transform: translateY(-50%); }
.zero__tag--b { bottom: -8px; left: 50%; transform: translateX(-50%); }
.zero__tag--l { top: 50%; left: -10px; transform: translateY(-50%); }
@keyframes spin { to { transform: rotate(360deg); } }

/* marquee */
.marquee { overflow: hidden; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 16px 0; -webkit-mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent); }
.marquee__track { display: flex; gap: 44px; width: max-content; animation: scroll 30s linear infinite; }
.marquee__track span { font-family: var(--f-display); font-size: 24px; font-weight: 600; color: #6E7177; white-space: nowrap; }
.marquee__track i { color: var(--signal); font-style: normal; }
@keyframes scroll { to { transform: translateX(-50%); } }

/* ---------- Cards / services ---------- */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.card {
  background: var(--surface-2); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px; transition: border-color .3s var(--ease), transform .3s var(--ease);
  display: flex; flex-direction: column;
}
.card:hover { border-color: var(--line-2); transform: translateY(-4px); }
.card--feature { grid-column: span 1; }
.card__top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 22px; }
.card__icon { font-size: 26px; line-height: 1; }
.card__tag { font-family: var(--f-mono); font-size: 11px; text-transform: uppercase; letter-spacing: .1em; color: var(--signal); padding: 4px 10px; border: 1px solid var(--line); border-radius: 999px; }
.card h3 { font-family: var(--f-display); font-weight: 600; font-size: 21px; letter-spacing: -.01em; margin-bottom: 10px; }
.card p { color: var(--muted); font-size: 15.5px; }
.chips { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 20px; }
.chips li { font-family: var(--f-mono); font-size: 12px; color: var(--muted); padding: 5px 11px; background: var(--void); border: 1px solid var(--line); border-radius: 999px; }
.card--cta { grid-column: 1 / -1; background: var(--void); flex-direction: row; align-items: center; justify-content: space-between; gap: 24px; }
.card--cta h3 { color: var(--ink); }
.link-arrow { color: var(--signal); font-weight: 600; margin-top: 14px; display: inline-flex; gap: 6px; }
.link-arrow:hover { filter: brightness(1.15); }

/* ---------- Principles ---------- */
.principles { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px 48px; }
.principle { padding: 26px 0 8px; border-top: 1px solid var(--line); transition: border-color .3s var(--ease); }
.principle:hover { border-top-color: var(--line-2); }
.principle__tag { font-family: var(--f-mono); font-size: 12px; color: var(--signal); letter-spacing: .06em; display: block; margin-bottom: 16px; }
.principle h3 { font-family: var(--f-display); font-weight: 600; font-size: 19px; letter-spacing: -.01em; margin-bottom: 8px; }
.principle p { color: var(--muted); font-size: 15px; }

/* ---------- Process ---------- */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; counter-reset: step; }
.step { padding: 28px 0 0; border-top: 1px solid var(--line); position: relative; }
.step__num { font-family: var(--f-mono); font-size: 13px; color: var(--signal); display: block; margin-bottom: 18px; }
.step h3 { font-family: var(--f-display); font-weight: 600; font-size: 20px; letter-spacing: -.01em; margin-bottom: 10px; }
.step p { color: var(--muted); font-size: 15px; }

/* ---------- About ---------- */
.about { display: grid; grid-template-columns: 1.3fr .7fr; gap: clamp(30px, 5vw, 72px); align-items: start; }
.about__copy p { color: var(--muted); margin-bottom: 16px; font-size: 17px; }
.about__panel { background: var(--surface-2); border: 1px solid var(--line); border-radius: var(--radius); padding: 30px; position: sticky; top: 100px; }
.panel__title { font-family: var(--f-mono); font-size: 12px; text-transform: uppercase; letter-spacing: .12em; color: var(--muted); margin-bottom: 18px; }
.beliefs { display: flex; flex-direction: column; gap: 16px; }
.beliefs li { font-size: 15.5px; color: var(--muted); padding-left: 18px; position: relative; }
.beliefs li::before { content: ""; position: absolute; left: 0; top: 10px; width: 8px; height: 1px; background: var(--signal); }
.beliefs b { color: var(--ink); font-weight: 600; }

/* ---------- Contact ---------- */
.contact { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(30px, 5vw, 72px); align-items: start; }
.contact__list { margin-top: 28px; display: flex; flex-direction: column; gap: 12px; }
.contact__list li { font-size: 16px; }
.contact__form { background: var(--surface-2); border: 1px solid var(--line); border-radius: var(--radius); padding: clamp(24px, 3vw, 34px); display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.field { display: flex; flex-direction: column; gap: 7px; }
.field--full { grid-column: span 2; }
.field label { font-family: var(--f-mono); font-size: 12px; text-transform: uppercase; letter-spacing: .1em; color: var(--muted); }
.field input, .field select, .field textarea {
  background: var(--void); border: 1px solid var(--line); border-radius: 12px;
  padding: 13px 15px; color: var(--ink); font-size: 15px; transition: border-color .2s;
  width: 100%;
}
.field textarea { resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--signal); }
.field input::placeholder, .field textarea::placeholder { color: var(--dim); }
.contact__form .btn { grid-column: span 2; }
.form__note { grid-column: span 2; font-family: var(--f-mono); font-size: 13px; color: var(--signal); min-height: 1em; }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--line); background: var(--void); }
.footer__inner { max-width: var(--maxw); margin: 0 auto; padding: clamp(40px, 6vw, 64px) var(--gut); display: flex; flex-wrap: wrap; gap: 18px 32px; align-items: center; justify-content: space-between; }
.footer__links { display: flex; gap: 22px; flex-wrap: wrap; }
.footer__links a { font-size: 14px; color: var(--muted); transition: color .2s; }
.footer__links a:hover { color: var(--ink); }
.footer__copy { width: 100%; text-align: center; color: var(--muted); padding-top: 12px; border-top: 1px solid var(--line); margin-top: 8px; }

/* ---------- Reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .zero__ring, .marquee__track { animation: none; }
  html { scroll-behavior: auto; }
}

/* ---------- Responsive ---------- */
@media (max-width: 980px) {
  .hero__grid { grid-template-columns: 1fr; }
  .hero__visual { order: -1; min-height: 280px; }
  .cards, .principles { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .about, .contact { grid-template-columns: 1fr; }
  .about__panel { position: static; }
}
@media (max-width: 760px) {
  .nav__links, .nav__cta { display: none; }
  .nav__burger { display: flex; }
  .cards, .principles, .steps { grid-template-columns: 1fr; }
  .contact__form { grid-template-columns: 1fr; }
  .field--full, .contact__form .btn, .form__note { grid-column: span 1; }
  .hero__stats { flex-wrap: wrap; }
  .card--cta { flex-direction: column; align-items: flex-start; }
}