/* ============================================================
   OPTAC — one-page site
   Palette and type follow the OPTAC brochure identity.
   ============================================================ */

:root {
  --orange: #F0691E;
  --orange-soft: #F0894B;
  --black: #151515;
  --ink: #1C1C1C;
  --forest: #1E2B1A;      /* dark green headlines */
  --olive: #6B7352;       /* models table background */
  --moss: #7C8663;        /* TOC-page olive */
  --sage: #AFC4B4;        /* light green-gray */
  --mint: #CFDDD2;
  --green: #17A85B;       /* problem-page bright green */
  --cream: #F3EFE6;
  --pink: #EDDCD6;        /* OPTX page background */
  --paper: #F5F4F0;
  --line-yellow: #E5C25B;
  --line-green: #3E8E5A;
  --line-pink: #E9B8C0;

  --font-display: 'Archivo Black', 'Archivo', sans-serif;
  --font-body: 'Archivo', sans-serif;
  --font-tech: 'Chakra Petch', 'Archivo', sans-serif;

  --container: 1180px;
  --radius: 10px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 84px; }
body {
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; }

.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }

/* ---------- Typography ---------- */
.display {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.06;
  letter-spacing: -0.01em;
  font-size: clamp(1.9rem, 4.2vw, 3.4rem);
  text-wrap: balance;
  margin-bottom: 0.6em;
}
.display--dark  { color: var(--forest); }
.display--light { color: var(--cream); }
.display--cream { color: var(--cream); }

.kicker {
  font-family: var(--font-tech);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  font-size: 0.78rem;
  margin-bottom: 1rem;
  color: var(--forest);
}
.kicker--light  { color: var(--cream); opacity: 0.85; }
.kicker--orange { color: var(--orange); }

.lead { font-size: 1.25rem; font-weight: 600; margin-bottom: 0.8rem; }
.lead--orange { color: var(--orange); }
.accent { color: var(--orange); }
.fineprint { font-size: 0.8rem; opacity: 0.7; margin-top: 1rem; }

.tech-h {
  font-family: var(--font-tech);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 1.05rem;
  margin: 1.6rem 0 0.8rem;
  color: var(--forest);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  font-family: var(--font-tech);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.85rem;
  padding: 0.85em 1.7em;
  border-radius: 6px;
  text-decoration: none;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn--orange { background: var(--orange); color: #fff; }
.btn--orange:hover { background: #d95a13; }
.btn--ghost { border-color: var(--cream); color: var(--cream); background: transparent; }
.btn--ghost:hover { background: var(--cream); color: var(--black); }
.btn--dark { background: var(--forest); color: var(--cream); }
.btn--dark:hover { background: var(--black); }
.btn--lg { font-size: 0.95rem; padding: 1em 2em; }

/* ---------- Glitch line motif ---------- */
.glitch { position: absolute; inset: 0; overflow: hidden; pointer-events: none; }
.glitch i {
  position: absolute;
  height: 4px;
  border-radius: 2px;
  opacity: 0.75;
}

/* ---------- Nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(21, 21, 21, 0.92);
  backdrop-filter: blur(8px);
  color: var(--cream);
  border-bottom: 1px solid rgba(243, 239, 230, 0.12);
}
.nav__inner {
  max-width: var(--container); margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; gap: 28px;
  height: 68px;
}
.logo { height: 34px; width: auto; color: var(--cream); }
.logo--footer { height: 40px; }
.nav__links { display: flex; gap: 22px; margin-left: auto; }
.nav__links a {
  text-decoration: none;
  font-family: var(--font-tech);
  font-weight: 600;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  opacity: 0.85;
  transition: opacity 0.15s, color 0.15s;
}
.nav__links a:hover { opacity: 1; color: var(--orange-soft); }
.nav__links-cta { display: none; }
.nav__cta { white-space: nowrap; }
.nav__burger {
  display: none;
  background: none; border: 0; cursor: pointer;
  flex-direction: column; gap: 5px; padding: 8px;
  margin-left: auto;
}
.nav__burger span { width: 24px; height: 2.5px; background: var(--cream); border-radius: 2px; transition: 0.2s; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 92vh;
  display: flex; align-items: flex-end;
  color: var(--cream);
  background: var(--black);
  overflow: hidden;
}
.hero__bg {
  position: absolute; inset: 0;
  background: url("../images/hero.jpg") center 30% / cover no-repeat;
  filter: saturate(0.9);
}
.hero__bg::after {
  content: "";
  position: absolute; inset: 0;
  background:
    linear-gradient(180deg, rgba(21,21,21,0.55) 0%, rgba(21,21,21,0.15) 35%, rgba(21,21,21,0.82) 78%, rgba(21,21,21,0.95) 100%);
}
.hero__content { position: relative; z-index: 2; padding-top: 16vh; padding-bottom: 9vh; width: 100%; }
.hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 7vw, 5.4rem);
  line-height: 1.02;
  margin: 0.4em 0 0.35em;
}
.hero__sub { max-width: 540px; font-size: 1.1rem; margin-bottom: 1.6rem; }
.hero__actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 2.4rem; }
.hero__stats {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  max-width: 760px;
  border-top: 1px solid rgba(243,239,230,0.25);
  padding-top: 1.4rem;
}
.hero__stats li { display: flex; flex-direction: column; }
.stat-num { font-family: var(--font-display); font-size: 1.7rem; color: var(--orange-soft); }
.stat-label { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.08em; opacity: 0.8; }
.hero__scroll {
  position: absolute; bottom: 18px; left: 50%; transform: translateX(-50%);
  color: var(--cream); opacity: 0.6; text-decoration: none; font-size: 0.8rem;
  z-index: 2;
  animation: bob 2s infinite ease-in-out;
}
@keyframes bob { 50% { transform: translate(-50%, 6px); } }

/* ---------- Mission strip ---------- */
.mission { background: var(--moss); padding: 84px 0; }
.mission__grid {
  display: grid; grid-template-columns: 1.4fr 1fr; gap: 48px; align-items: center;
}
.mission .display { margin-bottom: 0; }
.mission__aside { color: var(--cream); position: relative; }
.mission__aside .lead { color: var(--forest); }
.tally {
  margin-top: 1.2rem; height: 60px;
  background: repeating-linear-gradient(90deg, var(--orange) 0 14px, transparent 14px 24px);
  width: 180px; border-radius: 2px;
}

/* ---------- About ---------- */
.about { background: var(--sage); padding: 90px 0 70px; }
.about__grid { display: grid; grid-template-columns: 1fr 1.15fr; gap: 56px; align-items: center; margin-bottom: 56px; }
.about__media img { border-radius: var(--radius); box-shadow: 0 22px 40px rgba(30,43,26,0.25); }
.about__statement { color: var(--forest); font-size: 1.2rem; margin: 1.2rem 0 0.8rem; }
.about__text p { margin-bottom: 0.9rem; }
.about__wide img { border-radius: var(--radius); width: 100%; object-fit: cover; max-height: 460px; }

/* ---------- Problem ---------- */
.problem { background: var(--green); padding: 90px 0; color: var(--forest); }
.problem__sub { font-size: 1.3rem; font-weight: 700; margin-bottom: 2.2rem; max-width: 620px; }
.problem__points { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.point {
  background: rgba(255,255,255,0.14);
  border: 1px solid rgba(255,255,255,0.25);
  border-radius: var(--radius);
  padding: 26px 24px;
  display: flex; gap: 14px; align-items: flex-start;
}
.point__icon {
  font-family: var(--font-display);
  color: #fff; background: var(--forest);
  min-width: 34px; height: 34px; border-radius: 50%;
  display: grid; place-items: center;
  font-size: 1.1rem; line-height: 1;
}
.point p { font-weight: 500; }

/* ---------- Solution ---------- */
.solution { position: relative; background: var(--black); color: var(--cream); padding: 100px 0; overflow: hidden; }
.solution__grid { display: grid; grid-template-columns: 0.85fr 1.15fr; gap: 60px; align-items: center; position: relative; z-index: 2; }
.solution__media img { border-radius: var(--radius); }
.solution__callout { font-size: 1.25rem; margin: 1rem 0 1.8rem; }
.solution__callout strong { color: var(--orange-soft); }

/* ---------- Features ---------- */
.features { background: var(--paper); padding: 96px 0; }
.features__head { max-width: 720px; margin-bottom: 2.6rem; }
.features__sub { font-size: 1.15rem; font-weight: 600; color: var(--forest); text-transform: uppercase; letter-spacing: 0.03em; }
.features__grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; margin-bottom: 3rem; }
.feature {
  background: #fff; border: 1px solid #E4E1D8; border-radius: var(--radius);
  padding: 26px 22px;
}
.feature__check {
  display: inline-grid; place-items: center;
  width: 38px; height: 38px; border-radius: 50%;
  border: 2.5px solid var(--green); color: var(--green);
  font-weight: 700; font-size: 1.15rem;
  margin-bottom: 14px;
}
.feature h3 { font-size: 1.02rem; color: var(--forest); margin-bottom: 6px; }
.feature p { font-size: 0.92rem; }
.features__media img { border-radius: var(--radius); width: 100%; object-fit: cover; max-height: 440px; }
.features__media figcaption { font-size: 0.82rem; opacity: 0.7; margin-top: 8px; }

/* ---------- Models ---------- */
.models { background: var(--olive); padding: 96px 0; color: var(--cream); }
.models__layout { display: grid; grid-template-columns: 1.5fr 0.9fr; gap: 48px; align-items: start; margin-top: 1.4rem; }
.models__tablewrap { overflow-x: auto; }
.models__table {
  width: 100%; border-collapse: collapse; font-size: 0.98rem;
  margin-bottom: 1.4rem;
}
.models__table th {
  font-family: var(--font-tech); text-transform: uppercase; letter-spacing: 0.08em;
  font-size: 0.78rem; text-align: left; padding: 12px 14px;
  border-bottom: 2px solid rgba(243,239,230,0.5);
}
.models__table td { padding: 13px 14px; border-bottom: 1px dashed rgba(243,239,230,0.35); }
.models__table tr:hover td { background: rgba(243,239,230,0.07); }
.models__table strong { font-family: var(--font-display); font-weight: 400; font-size: 1.05em; }
.models__note { font-size: 0.88rem; opacity: 0.85; margin-bottom: 0.6rem; max-width: 560px; }
.models .btn { margin-top: 0.8rem; }
.models__media img { border-radius: var(--radius); }
.models__media figcaption { font-size: 0.82rem; opacity: 0.8; margin-top: 8px; }

/* ---------- Why unique ---------- */
.why { background: var(--black); color: var(--cream); padding: 96px 0; }
.why__grid { display: grid; grid-template-columns: 1.25fr 0.75fr; gap: 56px; align-items: start; }
.why .display { font-size: clamp(1.5rem, 2.8vw, 2.2rem); }
.metrics { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 2rem; }
.metric {
  border: 1px solid rgba(243,239,230,0.18);
  border-left: 4px solid var(--orange);
  border-radius: 8px;
  padding: 16px 18px;
  background: rgba(243,239,230,0.04);
}
.metric dt { font-family: var(--font-display); font-size: 1.9rem; color: var(--line-yellow); }
.metric dd { font-size: 0.9rem; opacity: 0.9; }
.why__media { display: grid; gap: 18px; }
.why__media img { border-radius: var(--radius); }

/* ---------- OPTX ---------- */
.optx { background: var(--pink); padding: 96px 0; }
.optx__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.optx__text p { margin-bottom: 1rem; }
.optx__media { display: grid; grid-template-columns: 1.4fr 0.6fr; gap: 16px; align-items: start; }
.optx__media img { border-radius: var(--radius); }
.optx .btn { margin-top: 0.6rem; }

/* ---------- Datasheet ---------- */
.datasheet { background: var(--forest); color: var(--cream); padding: 96px 0; }
.datasheet__intro { max-width: 820px; margin-bottom: 2.2rem; opacity: 0.92; }
.sheet {
  border: 1px solid rgba(243,239,230,0.2);
  border-radius: var(--radius);
  margin-bottom: 14px;
  background: rgba(0,0,0,0.16);
  overflow: hidden;
}
.sheet summary {
  cursor: pointer;
  font-family: var(--font-tech);
  font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em;
  padding: 16px 20px;
  list-style: none;
  position: relative;
}
.sheet summary::-webkit-details-marker { display: none; }
.sheet summary::after {
  content: "+"; position: absolute; right: 20px; top: 50%; transform: translateY(-50%);
  font-family: var(--font-display); color: var(--orange-soft); font-size: 1.2rem;
}
.sheet[open] summary::after { content: "–"; }
.sheet summary:hover { background: rgba(243,239,230,0.06); }
.sheet__tablewrap { overflow-x: auto; padding: 0 20px 20px; }
.sheet table, .integration table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
.sheet th, .sheet td { text-align: left; padding: 9px 12px; border-bottom: 1px solid rgba(243,239,230,0.14); vertical-align: top; }
.sheet th { font-family: var(--font-tech); text-transform: uppercase; font-size: 0.72rem; letter-spacing: 0.08em; opacity: 0.8; }

/* ---------- Integration ---------- */
.integration { background: var(--paper); padding: 96px 0; }
.integration__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; margin-top: 0.8rem; }
.integration__block { background: #fff; border: 1px solid #E4E1D8; border-radius: var(--radius); padding: 28px; }
.integration .sheet__tablewrap { padding: 0; }
.pinout th, .pinout td { border-bottom: 1px solid #E9E6DD; padding: 10px 10px; text-align: left; font-size: 0.9rem; }
.pinout th { font-family: var(--font-tech); text-transform: uppercase; font-size: 0.72rem; letter-spacing: 0.08em; color: var(--forest); }
.pin { display: inline-block; width: 11px; height: 11px; border-radius: 50%; margin-right: 5px; border: 1px solid rgba(0,0,0,0.25); vertical-align: baseline; }
.pin--black { background: #222; }
.pin--red { background: #D33; }
.pin--white { background: #fff; }
.pin--yellow { background: #E8C223; }
.specs-list { list-style: none; margin-top: 1.2rem; font-size: 0.92rem; }
.specs-list li { padding: 7px 0; border-bottom: 1px dashed #DDD9CD; }
.steps { margin: 0 0 0.6rem 1.2rem; font-size: 0.95rem; }
.steps li { margin-bottom: 7px; }
.integration__media img { border-radius: 8px; margin-top: 1rem; }
.integration__cta { margin-top: 2rem; font-size: 1.05rem; font-weight: 600; }
.integration__cta a { color: var(--orange); text-decoration: none; }
.integration__cta a:hover { text-decoration: underline; }

/* ---------- Media / press ---------- */
.media { background: var(--ink); color: var(--cream); padding: 96px 0; }
.media__row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin: 2rem 0 3rem; }
.media__item {
  display: grid; place-items: center; text-align: center;
  border: 1px dashed rgba(243,239,230,0.35);
  border-radius: var(--radius);
  min-height: 90px; padding: 18px;
  text-decoration: none; opacity: 0.7;
  font-family: var(--font-tech); text-transform: uppercase; letter-spacing: 0.06em; font-size: 0.8rem;
  transition: opacity 0.15s, border-color 0.15s;
}
.media__item:hover { opacity: 1; border-color: var(--orange); }
.media__video { max-width: 860px; }
.video-embed { position: relative; padding-top: 56.25%; border-radius: var(--radius); overflow: hidden; }
.video-embed iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.video-placeholder {
  border: 1px dashed rgba(243,239,230,0.35);
  border-radius: var(--radius);
  padding: 56px 24px; text-align: center; opacity: 0.75;
}
.video-placeholder__icon {
  display: inline-grid; place-items: center;
  width: 64px; height: 64px; border-radius: 50%;
  background: var(--orange); color: #fff; font-size: 1.4rem;
  margin-bottom: 14px;
}

/* ---------- Brochure CTA ---------- */
.brochure-cta { position: relative; background: var(--moss); padding: 84px 0; overflow: hidden; text-align: center; }
.brochure-cta__inner { position: relative; z-index: 2; max-width: 640px; }
.brochure-cta p { color: var(--cream); margin-bottom: 1.6rem; }

/* ---------- Contact ---------- */
.contact { background: var(--paper); padding: 96px 0; }
.contact__grid { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 60px; align-items: start; }
.contact__info p { margin-bottom: 1rem; }
.contact__channels { list-style: none; margin: 1.6rem 0; }
.contact__channels li { display: flex; gap: 16px; padding: 11px 0; border-bottom: 1px dashed #DDD9CD; align-items: baseline; }
.channel__label {
  font-family: var(--font-tech); text-transform: uppercase; letter-spacing: 0.08em;
  font-size: 0.72rem; color: var(--olive); min-width: 90px;
}
.contact__channels a { color: var(--forest); font-weight: 600; text-decoration: none; }
.contact__channels a:hover { color: var(--orange); }

.contact__form {
  background: #fff; border: 1px solid #E4E1D8; border-radius: var(--radius);
  padding: 32px;
  box-shadow: 0 16px 40px rgba(30,43,26,0.08);
}
.contact__form h3 { font-family: var(--font-display); color: var(--forest); margin-bottom: 1.2rem; font-size: 1.3rem; }
.form__row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.contact__form label {
  display: block; margin-bottom: 14px;
  font-family: var(--font-tech); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--forest); font-weight: 600;
}
.contact__form input, .contact__form select, .contact__form textarea {
  display: block; width: 100%;
  margin-top: 6px;
  font-family: var(--font-body); font-size: 0.98rem;
  padding: 11px 12px;
  border: 1.5px solid #D8D4C8; border-radius: 6px;
  background: var(--paper);
  transition: border-color 0.15s;
}
.contact__form input:focus, .contact__form select:focus, .contact__form textarea:focus {
  outline: none; border-color: var(--orange);
}
.contact__form textarea { resize: vertical; }
.contact__form .btn { width: 100%; margin-top: 6px; }
.hp { position: absolute !important; left: -9999px !important; height: 0; width: 0; opacity: 0; }
.form__status { margin-top: 12px; font-size: 0.9rem; font-weight: 600; min-height: 1.4em; }
.form__status.ok { color: var(--green); }
.form__status.err { color: #C0392B; }

/* ---------- Footer ---------- */
.footer { background: var(--black); color: var(--cream); padding: 56px 0 40px; }
.footer__inner { display: grid; gap: 26px; }
.footer__tag { font-family: var(--font-tech); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--orange-soft); margin-top: 10px; }
.footer__nav { display: flex; flex-wrap: wrap; gap: 18px; }
.footer__nav a {
  text-decoration: none; opacity: 0.75; font-size: 0.85rem;
  font-family: var(--font-tech); text-transform: uppercase; letter-spacing: 0.06em;
}
.footer__nav a:hover { opacity: 1; color: var(--orange-soft); }
.footer__legal { font-size: 0.78rem; opacity: 0.5; }

/* ---------- Reveal on scroll ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .hero__scroll { animation: none; }
}

/* ---------- Responsive ---------- */
@media (max-width: 980px) {
  .mission__grid, .about__grid, .solution__grid, .why__grid,
  .optx__grid, .integration__grid, .contact__grid, .models__layout { grid-template-columns: 1fr; }
  .problem__points { grid-template-columns: 1fr; }
  .features__grid { grid-template-columns: 1fr 1fr; }
  .hero__stats { grid-template-columns: 1fr 1fr; row-gap: 20px; }
  .optx__media { grid-template-columns: 1fr; }
  .optx__modules { max-width: 320px; }
  .media__row { grid-template-columns: 1fr; }
  .solution__media { max-width: 420px; }
}
@media (max-width: 760px) {
  .nav__links, .nav__cta { display: none; }
  .nav__burger { display: flex; }
  .nav.open .nav__links {
    display: flex; flex-direction: column;
    position: absolute; top: 68px; left: 0; right: 0;
    background: rgba(21,21,21,0.98);
    padding: 20px 24px 26px;
    gap: 18px;
    border-bottom: 1px solid rgba(243,239,230,0.12);
  }
  .nav.open .nav__links-cta { display: block; color: var(--orange-soft); opacity: 1; }
  .features__grid { grid-template-columns: 1fr; }
  .form__row { grid-template-columns: 1fr; gap: 0; }
  .hero { min-height: 86vh; }
}