/* =========================================================
   TT CORPORATION — Design System v2
   Enterprise / aerospace aesthetic: black canvas, light
   oversized display type, monospace technical labels,
   hairline borders, sharp corners, single amber accent.
   ========================================================= */

:root {
  /* Palette */
  --black:    #000000;
  --ink:      #0b0b0c;
  --ink-2:    #101012;
  --line:     rgba(255,255,255,0.14);
  --line-2:   rgba(255,255,255,0.28);
  --white:    #ffffff;
  --gray:     #9a9a9e;
  --gray-dim: #6a6a6e;
  --amber:    #f4b92e;
  --amber-dk: #d99f17;

  /* Type */
  --font-display: "Space Grotesk", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;

  /* Layout */
  --maxw: 1280px;
  --gutter: 40px;
  --transition: 0.32s cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; background: var(--black); }
body {
  font-family: var(--font-body);
  background: var(--black);
  color: var(--white);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
::selection { background: var(--amber); color: #000; }

/* ---------- Typography ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.04;
  letter-spacing: -0.02em;
}
.display { font-size: clamp(2.8rem, 8vw, 6.5rem); font-weight: 300; letter-spacing: -0.03em; }
h1 { font-size: clamp(2.4rem, 5.5vw, 4.2rem); font-weight: 300; }
h2 { font-size: clamp(1.9rem, 3.8vw, 3rem); font-weight: 300; }
h3 { font-size: 1.5rem; font-weight: 400; }
p  { color: var(--gray); }
strong { color: var(--white); font-weight: 600; }

/* Monospace technical label */
.mono {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gray-dim);
}
.mono--amber { color: var(--amber); }
.mono--white { color: var(--white); }

/* ---------- Layout helpers ---------- */
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gutter); }
.section { padding: 120px 0; border-top: 1px solid var(--line); }
.section--plain { border-top: 0; }
.center { text-align: center; }
.lead { font-size: 1.15rem; line-height: 1.7; color: var(--gray); max-width: 600px; }
.center .lead { margin-inline: auto; }

.section-head { margin-bottom: 64px; max-width: 760px; }
.center.section-head { margin-inline: auto; }
.section-head .mono { display: block; margin-bottom: 22px; }
.section-head h2 { margin-bottom: 0; }
.section-head .lead { margin-top: 24px; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 12px;
  font-family: var(--font-mono);
  font-size: 0.78rem; letter-spacing: 0.18em; text-transform: uppercase;
  padding: 18px 34px;
  border: 1px solid var(--line-2);
  background: transparent; color: var(--white);
  cursor: pointer; border-radius: 0;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}
.btn .arrow { font-size: 0.9rem; transition: transform var(--transition); }
.btn:hover { background: var(--white); color: #000; border-color: var(--white); }
.btn:hover .arrow { transform: translate(3px, -3px); }
.btn--amber { background: var(--amber); color: #000; border-color: var(--amber); }
.btn--amber:hover { background: var(--amber-dk); border-color: var(--amber-dk); color: #000; }
.btn--block { width: 100%; }

/* Split bordered button row */
.btn-split { display: grid; grid-template-columns: 1fr 1fr; border: 1px solid var(--line); }
.btn-split .btn { border: 0; border-right: 1px solid var(--line); }
.btn-split .btn:last-child { border-right: 0; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(0,0,0,0.78);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; height: 78px; }
.nav__links { display: flex; align-items: center; gap: 38px; }
.nav__links a {
  font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--gray); transition: color var(--transition);
}
.nav__links a:hover, .nav__links a.is-active { color: var(--white); }
.brand {
  font-family: var(--font-display); font-weight: 500; font-size: 1.15rem;
  letter-spacing: 0.34em; color: var(--white); text-align: center; white-space: nowrap;
  padding-left: 0.34em;
}
.brand sup { color: var(--amber); font-size: 0.55em; letter-spacing: 0; top: -0.7em; }
.nav__right { display: flex; align-items: center; justify-content: flex-end; }
.nav__right .btn { padding: 14px 26px; }
.nav__toggle { display: none; background: none; border: 0; cursor: pointer; padding: 10px; justify-self: end; }
.nav__toggle span { display: block; width: 26px; height: 1.5px; background: var(--white); margin: 6px 0; transition: var(--transition); }

/* ---------- Hero ---------- */
.hero { position: relative; border-bottom: 1px solid var(--line); overflow: hidden; }
.hero__bg {
  position: absolute; inset: 0; z-index: 0; pointer-events: none;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 80px 80px;
  -webkit-mask-image: radial-gradient(120% 90% at 50% 35%, #000 30%, transparent 75%);
          mask-image: radial-gradient(120% 90% at 50% 35%, #000 30%, transparent 75%);
  opacity: 0.5;
}
.hero__glow {
  position: absolute; left: 50%; top: 30%; transform: translate(-50%,-50%);
  width: 900px; height: 900px; z-index: 0; pointer-events: none;
  background: radial-gradient(circle, rgba(244,185,46,0.10), transparent 60%);
}
.hero__inner {
  position: relative; z-index: 1;
  min-height: 84vh; display: flex; flex-direction: column; justify-content: center;
  padding: 120px 0;
}
.hero__ticker { position: absolute; top: 104px; left: var(--gutter); z-index: 2; line-height: 1.9; }
.hero__ticker .mono { display: block; }
.hero__center { text-align: center; max-width: 1000px; margin-inline: auto; }
.hero__center .mono { margin-bottom: 30px; }
.hero h1.display { margin-bottom: 0; }
.hero__sub { max-width: 560px; margin: 34px auto 0; color: var(--gray); font-size: 1.1rem; }
.hero__actions { margin-top: 46px; display: flex; gap: 0; justify-content: center; flex-wrap: wrap; }
.hero__foot {
  position: absolute; bottom: 104px; left: var(--gutter); right: var(--gutter); z-index: 2;
  display: flex; justify-content: space-between; align-items: end; gap: 24px;
}
.hero__foot p { max-width: 360px; font-size: 0.95rem; color: var(--gray); }

/* ---------- Stat row ---------- */
.stats { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); }
.stat { padding: 44px var(--gutter); border-right: 1px solid var(--line); }
.stat:last-child { border-right: 0; }
.stat .mono { margin-bottom: 14px; }
.stat .num { font-family: var(--font-display); font-weight: 300; font-size: 2.6rem; color: var(--white); letter-spacing: -0.02em; }
.stat p { margin-top: 8px; font-size: 0.9rem; }

/* ---------- Cards ---------- */
.grid { display: grid; gap: 0; border: 1px solid var(--line); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }

.cell {
  padding: 48px 38px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line);
  transition: background var(--transition); position: relative;
}
.cell:hover { background: var(--ink); }
.grid--3 .cell:nth-child(3n) { border-right: 0; }
.grid--4 .cell:nth-child(4n) { border-right: 0; }
.grid--2 .cell:nth-child(2n) { border-right: 0; }
.cell .idx { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.2em; color: var(--amber); }
.cell h3 { margin: 22px 0 14px; }
.cell p { font-size: 0.96rem; }
.cell .marker {
  width: 38px; height: 38px; margin-bottom: 26px; display: grid; place-items: center;
  border: 1px solid var(--line-2); color: var(--amber); font-size: 1.05rem;
}

/* Service tier */
.tier { display: flex; flex-direction: column; }
.tier .price { font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: 0.18em; color: var(--gray-dim); text-transform: uppercase; margin-top: 6px; }
.tier__list { margin: 24px 0 32px; display: grid; gap: 12px; }
.tier__list li { font-size: 0.92rem; color: var(--gray); padding-left: 22px; position: relative; }
.tier__list li::before { content: "—"; position: absolute; left: 0; color: var(--amber); }
.tier .btn { margin-top: auto; }
.cell.is-featured { background: var(--ink); }
.cell.is-featured .marker { border-color: var(--amber); }

/* ---------- Split feature ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; }
.split__text { padding: 96px var(--gutter); display: flex; flex-direction: column; justify-content: center; }
.split__text.bordered { border-left: 1px solid var(--line); }
.split__media {
  position: relative; min-height: 520px; border-left: 1px solid var(--line);
  background:
    radial-gradient(420px 280px at 60% 35%, rgba(244,185,46,0.14), transparent 65%),
    repeating-linear-gradient(0deg, transparent, transparent 39px, var(--line) 39px, var(--line) 40px),
    repeating-linear-gradient(90deg, transparent, transparent 39px, var(--line) 39px, var(--line) 40px),
    var(--ink);
}
.split__media .coord { position: absolute; bottom: 24px; left: 24px; }
.split__media .ring {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%,-50%);
  width: 240px; height: 240px; border: 1px solid var(--line-2); border-radius: 50%;
}
.split__media .ring::after {
  content: ""; position: absolute; inset: 38px; border: 1px solid var(--amber); border-radius: 50%; opacity: 0.5;
}
.split__text .mono { margin-bottom: 22px; }
.split__text h2 { margin-bottom: 24px; }
.split__text p + p { margin-top: 16px; }
.split__text .btn { margin-top: 38px; align-self: flex-start; }

/* ---------- CTA band ---------- */
.cta { text-align: center; padding: 130px 0; }
.cta .mono { display: block; margin-bottom: 26px; }
.cta h2 { margin-bottom: 22px; }
.cta .btn { margin-top: 36px; }

/* ---------- Page hero (interior) ---------- */
.page-hero { border-bottom: 1px solid var(--line); padding: 120px 0 90px; position: relative; }
.page-hero .mono { display: block; margin-bottom: 24px; }
.page-hero h1 { max-width: 960px; }
.page-hero .lead { margin-top: 28px; }

/* ---------- Process steps ---------- */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); border: 1px solid var(--line); }
.step { padding: 44px 34px; border-right: 1px solid var(--line); }
.step:last-child { border-right: 0; }
.step .idx { font-family: var(--font-mono); color: var(--amber); font-size: 0.8rem; letter-spacing: 0.2em; }
.step h3 { margin: 28px 0 12px; font-size: 1.25rem; }
.step p { font-size: 0.92rem; }

/* ---------- Form ---------- */
.contact-grid { display: grid; grid-template-columns: 0.85fr 1.15fr; border: 1px solid var(--line); }
.contact-aside { padding: 56px 44px; border-right: 1px solid var(--line); }
.contact-aside h2 { font-size: 1.6rem; margin-bottom: 18px; }
.info-item { padding: 24px 0; border-bottom: 1px solid var(--line); }
.info-item:last-child { border-bottom: 0; }
.info-item .mono { margin-bottom: 8px; }
.info-item a, .info-item p { color: var(--white); font-size: 1rem; }
.info-item a:hover { color: var(--amber); }

.form { padding: 56px 44px; display: grid; gap: 26px; }
.form__row { display: grid; grid-template-columns: 1fr 1fr; gap: 26px; }
.field { display: flex; flex-direction: column; gap: 10px; }
.field label { font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.18em; text-transform: uppercase; color: var(--gray-dim); }
.field input, .field select, .field textarea {
  font-family: var(--font-body); font-size: 1rem; color: var(--white);
  padding: 14px 0; border: 0; border-bottom: 1px solid var(--line-2);
  background: transparent; transition: border-color var(--transition);
}
.field input::placeholder, .field textarea::placeholder { color: var(--gray-dim); }
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--amber); }
.field select { color: var(--white); }
.field select option { background: var(--ink); color: var(--white); }
.field textarea { resize: vertical; min-height: 120px; }
.form__note { font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.1em; color: var(--gray-dim); text-transform: uppercase; }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--line); padding: 80px 0 36px; }
.footer__top { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 48px; padding-bottom: 56px; border-bottom: 1px solid var(--line); }
.footer__brand .brand { text-align: left; padding: 0; display: inline-block; margin-bottom: 22px; }
.footer__brand p { max-width: 340px; font-size: 0.95rem; }
.footer__col h5 { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.18em; text-transform: uppercase; color: var(--gray-dim); margin-bottom: 20px; }
.footer__col a { display: block; padding: 8px 0; color: var(--gray); font-size: 0.95rem; transition: color var(--transition); }
.footer__col a:hover { color: var(--white); }
.footer__bottom { padding-top: 28px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
.footer__bottom .mono { font-size: 0.68rem; }

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  :root { --gutter: 24px; }
  .nav { grid-template-columns: auto auto; }
  .nav__links, .nav__right { display: none; }
  .nav__toggle { display: block; }
  .brand { text-align: left; }
  .nav.is-open .nav__links {
    display: flex; flex-direction: column; gap: 0; align-items: flex-start;
    position: absolute; top: 78px; left: 0; right: 0; background: var(--black);
    border-bottom: 1px solid var(--line); padding: 8px var(--gutter) 24px;
  }
  .nav.is-open .nav__links a { padding: 16px 0; width: 100%; border-top: 1px solid var(--line); }
  .split, .contact-grid { grid-template-columns: 1fr; }
  .split__media, .split__text.bordered { border-left: 0; border-top: 1px solid var(--line); }
  .contact-aside { border-right: 0; border-bottom: 1px solid var(--line); }
  .grid--4, .steps { grid-template-columns: repeat(2, 1fr); }
  .grid--4 .cell:nth-child(4n), .steps .step:nth-child(4n) { border-right: 1px solid var(--line); }
  .grid--4 .cell:nth-child(2n), .steps .step:nth-child(2n) { border-right: 0; }
  .section { padding: 80px 0; }
  .hero__ticker, .hero__foot { display: none; }
  .hero__inner { min-height: 70vh; }
  .footer__top { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
  .grid--3, .grid--4, .grid--2, .steps, .stats, .form__row { grid-template-columns: 1fr; }
  .cell, .step, .stat { border-right: 0 !important; }
  .btn-split { grid-template-columns: 1fr; }
  .btn-split .btn { border-right: 0; border-bottom: 1px solid var(--line); }
  .btn-split .btn:last-child { border-bottom: 0; }
  .hero__actions { flex-direction: column; width: 100%; }
  .hero__actions .btn { width: 100%; }
  .footer__top { grid-template-columns: 1fr; }
}