/* ==========================================================================
   Qairo AI — single-page site
   Palette: near-black base, grey secondary, copper accent (from logo)
   ========================================================================== */

:root {
  --bg: #0c0c0d;
  --bg-raised: #121214;
  --line: #232326;
  --text: #ececec;
  --muted: #9b9ba1;
  --copper: #c28f6b;
  --copper-bright: #d9a97f;
  --copper-dim: rgba(194, 143, 107, 0.35);

  --font-head: "Jost", "Century Gothic", sans-serif;
  --font-body: "Inter", "Helvetica Neue", sans-serif;

  --container: 1080px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-weight: 300;
  font-size: 17px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

a { color: var(--copper); text-decoration: none; }

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

.container.narrow { max-width: 820px; }

.accent { color: var(--copper); }

/* ===== Buttons ===== */

.btn {
  display: inline-block;
  font-family: var(--font-head);
  font-weight: 400;
  font-size: 15px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 14px 32px;
  border-radius: 2px;
  transition: all 0.35s var(--ease);
}

.btn-solid {
  background: var(--copper);
  color: #111;
}
.btn-solid:hover {
  background: var(--copper-bright);
  transform: translateY(-2px);
}

.btn-outline {
  border: 1px solid var(--copper-dim);
  color: var(--copper);
}
.btn-outline:hover {
  border-color: var(--copper);
  transform: translateY(-1px);
}

.btn-ghost {
  color: var(--muted);
  border: 1px solid transparent;
}
.btn-ghost:hover { color: var(--text); }

.btn-lg {
  font-size: 16px;
  padding: 18px 40px;
  text-transform: none;
  letter-spacing: 0.04em;
}

/* ===== Navigation ===== */

.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  background: rgba(12, 12, 13, 0.72);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.4s var(--ease);
}

.nav.scrolled { border-bottom-color: var(--line); }

.nav-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  height: 72px;
  display: flex;
  align-items: center;
  gap: 40px;
}

.nav-logo { height: 30px; width: auto; }

.nav-brand { display: flex; align-items: center; }

.nav-links {
  display: flex;
  gap: 36px;
  margin-left: auto;
}

.nav-links a {
  font-family: var(--font-head);
  font-weight: 300;
  font-size: 15px;
  letter-spacing: 0.06em;
  color: var(--muted);
  transition: color 0.3s var(--ease);
}

.nav-links a:hover { color: var(--copper); }

.nav-cta { padding: 10px 24px; font-size: 13px; }

.nav-toggle {
  display: none;
  margin-left: auto;
  background: none;
  border: none;
  width: 40px;
  height: 40px;
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 7px;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 1px;
  background: var(--text);
  transition: transform 0.3s var(--ease), opacity 0.3s var(--ease);
}
.nav-toggle[aria-expanded="true"] span:first-child { transform: translateY(4px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:last-child { transform: translateY(-4px) rotate(-45deg); }

.nav-mobile {
  display: none;
  flex-direction: column;
  padding: 8px 24px 24px;
  border-bottom: 1px solid var(--line);
}
.nav-mobile a {
  font-family: var(--font-head);
  font-size: 17px;
  letter-spacing: 0.05em;
  color: var(--text);
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}
.nav-mobile a:last-child { border-bottom: none; color: var(--copper); }
.nav.open .nav-mobile { display: flex; }

/* ===== Hero ===== */

.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  position: relative;
  overflow: hidden;
  padding: 120px 24px 80px;
}

.hero-ring {
  position: absolute;
  top: 50%;
  left: 50%;
  width: min(78vh, 90vw);
  transform: translate(-50%, -50%);
  opacity: 0.14;
  pointer-events: none;
  animation: ring-drift 26s ease-in-out infinite alternate;
}

@keyframes ring-drift {
  from { transform: translate(-50%, -50%) rotate(-3deg) scale(1); }
  to   { transform: translate(-50%, -50%) rotate(3deg) scale(1.04); }
}

.hero-content {
  position: relative;
  max-width: 760px;
}

.hero-kicker {
  font-family: var(--font-head);
  font-weight: 300;
  font-size: 14px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 28px;
}

.hero-title {
  font-family: var(--font-head);
  font-weight: 200;
  font-size: clamp(44px, 7.5vw, 84px);
  line-height: 1.12;
  letter-spacing: 0.01em;
  margin-bottom: 28px;
}

.hero-sub {
  color: var(--muted);
  font-size: clamp(16px, 2vw, 19px);
  max-width: 620px;
  margin: 0 auto 44px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-scroll {
  position: absolute;
  bottom: 36px;
  left: 50%;
  transform: translateX(-50%);
}

.hero-scroll-line {
  display: block;
  width: 1px;
  height: 56px;
  background: var(--copper-dim);
  position: relative;
  overflow: hidden;
}
.hero-scroll-line::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--copper);
  transform: translateY(-100%);
  animation: scroll-hint 2.6s var(--ease) infinite;
}

@keyframes scroll-hint {
  0% { transform: translateY(-100%); }
  55% { transform: translateY(100%); }
  100% { transform: translateY(100%); }
}

/* ===== Sections ===== */

.section { padding: 130px 0; }

.section-kicker {
  font-family: var(--font-head);
  font-weight: 400;
  font-size: 13px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--copper);
  margin-bottom: 20px;
}

.section-title {
  font-family: var(--font-head);
  font-weight: 200;
  font-size: clamp(30px, 4.4vw, 46px);
  line-height: 1.22;
  margin-bottom: 40px;
  max-width: 720px;
}

.divider {
  height: 1px;
  max-width: var(--container);
  margin: 0 auto;
  background: var(--line);
}

/* ===== About ===== */

.about-copy p { margin-bottom: 22px; }
.about-copy p:last-child { margin-bottom: 0; }
.about-copy strong { font-weight: 500; color: var(--text); }

.about-points {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  margin-top: 72px;
}

.about-point {
  border-top: 1px solid var(--line);
  padding-top: 24px;
  transition: border-color 0.4s var(--ease);
}
.about-point:hover { border-top-color: var(--copper-dim); }

.about-point h3 {
  font-family: var(--font-head);
  font-weight: 400;
  font-size: 19px;
  letter-spacing: 0.03em;
  color: var(--copper);
  margin-bottom: 12px;
}

.about-point p { color: var(--muted); font-size: 15.5px; }

/* ===== How It Works ===== */

.steps {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 36px;
  margin-top: 24px;
  counter-reset: step;
}

.step {
  border-top: 1px solid var(--line);
  padding-top: 28px;
  transition: border-color 0.4s var(--ease);
}
.step:hover { border-top-color: var(--copper); }

.step-num {
  font-family: var(--font-head);
  font-weight: 200;
  font-size: 40px;
  color: var(--copper-dim);
  display: block;
  margin-bottom: 16px;
  line-height: 1;
}

.step h3 {
  font-family: var(--font-head);
  font-weight: 400;
  font-size: 20px;
  letter-spacing: 0.03em;
  margin-bottom: 12px;
}

.step p { color: var(--muted); font-size: 15.5px; }

/* ===== Services ===== */

.cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  margin-top: 24px;
}

.card {
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 44px 40px;
  transition: border-color 0.4s var(--ease), transform 0.4s var(--ease);
}

.card:hover {
  border-color: var(--copper-dim);
  transform: translateY(-4px);
}

.card h3 {
  font-family: var(--font-head);
  font-weight: 400;
  font-size: 22px;
  letter-spacing: 0.03em;
  color: var(--copper);
  margin-bottom: 14px;
}

.card p { color: var(--muted); font-size: 16px; }

/* ===== FAQ ===== */

.faq-list { margin-top: 8px; }

.faq-item {
  border-bottom: 1px solid var(--line);
}

.faq-item summary {
  font-family: var(--font-head);
  font-weight: 400;
  font-size: 19px;
  letter-spacing: 0.02em;
  padding: 26px 44px 26px 0;
  cursor: pointer;
  list-style: none;
  position: relative;
  transition: color 0.3s var(--ease);
}
.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-head);
  font-weight: 200;
  font-size: 28px;
  color: var(--copper);
  transition: transform 0.35s var(--ease);
}

.faq-item[open] summary { color: var(--copper); }
.faq-item[open] summary::after { transform: translateY(-50%) rotate(45deg); }

.faq-item summary:hover { color: var(--copper); }

.faq-body { padding: 0 44px 28px 0; }
.faq-body p { color: var(--muted); }

/* ===== CTA ===== */

.cta {
  padding: 150px 0 160px;
  text-align: center;
  border-top: 1px solid var(--line);
}

.cta-mark {
  width: 76px;
  margin: 0 auto 36px;
  opacity: 0.9;
}

.cta-title {
  font-family: var(--font-head);
  font-weight: 200;
  font-size: clamp(30px, 4.4vw, 44px);
  line-height: 1.25;
  margin-bottom: 20px;
}

.cta-sub {
  color: var(--muted);
  max-width: 560px;
  margin: 0 auto 44px;
}

.cta-contact {
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: center;
  margin-bottom: 28px;
}

.cta-divider {
  font-family: var(--font-head);
  font-weight: 300;
  font-size: 14px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.cta-note {
  font-size: 14px;
  color: var(--muted);
  font-style: italic;
}

/* ===== Footer ===== */

.footer {
  border-top: 1px solid var(--line);
  padding: 56px 0;
  text-align: center;
}

.footer-logo {
  height: 26px;
  width: auto;
  margin: 0 auto 16px;
  opacity: 0.85;
}

.footer-tag {
  font-family: var(--font-head);
  font-weight: 300;
  letter-spacing: 0.12em;
  font-size: 13px;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 12px;
}

.footer-meta { font-size: 13.5px; color: #6d6d73; }
.footer-meta a { color: #6d6d73; }
.footer-meta a:hover { color: var(--copper); }

/* ===== Reveal on scroll ===== */

.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.9s var(--ease), transform 0.9s var(--ease);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .hero-ring { animation: none; }
  .hero-scroll-line::after { animation: none; }
  .btn, .card, .step, .about-point { transition: none; }
}

/* ===== Responsive ===== */

@media (max-width: 960px) {
  .steps { grid-template-columns: repeat(2, 1fr); }
  .about-points { grid-template-columns: 1fr; gap: 28px; }
}

@media (max-width: 760px) {
  .nav-links, .nav-cta { display: none; }
  .nav-toggle { display: flex; }

  .section { padding: 90px 0; }
  .cards { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }

  .hero { min-height: 92vh; }
  .hero-actions .btn { width: 100%; text-align: center; }

  .faq-item summary { font-size: 17px; }

  .cta-contact { width: 100%; }
  .cta-contact .btn { width: 100%; }
}