/* ===========================================================
   O2O Labs — site styles
   Brand: dark base #0A0B0E · white · blue #3B82F6 / #38BDF8
   =========================================================== */

:root {
  --bg:        #0A0B0E;
  --bg-soft:   #101218;
  --bg-card:   #12141B;
  --line:      #1F2430;
  --line-soft: #181C25;
  --white:     #FFFFFF;
  --text:      #C7CEDA;
  --muted:     #7F8A9C;
  --blue:      #3B82F6;
  --blue-lite: #38BDF8;
  --glow:      rgba(56,189,248,.45);
  --maxw:      1120px;
  --mono:      "SF Mono", "JetBrains Mono", "Consolas", ui-monospace, monospace;
  --sans:      "Helvetica Neue", -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* subtle ambient glow at top */
body::before {
  content: "";
  position: fixed;
  top: -300px; left: 50%;
  width: 900px; height: 600px;
  transform: translateX(-50%);
  background: radial-gradient(ellipse at center, rgba(59,130,246,.10), transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 28px; position: relative; z-index: 1; }

a { color: var(--blue-lite); text-decoration: none; transition: color .18s ease; }
a:hover { color: var(--white); }

h1, h2, h3 { color: var(--white); font-weight: 500; line-height: 1.15; letter-spacing: -.01em; margin: 0; }
h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); }
h2 { font-size: clamp(1.6rem, 3vw, 2.3rem); }
h3 { font-size: 1.2rem; }
p { margin: 0 0 1.1rem; }

.eyebrow {
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .28em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 1.1rem;
  display: block;
}

.lead { font-size: 1.15rem; color: var(--text); max-width: 64ch; }
.muted { color: var(--muted); }
.center { text-align: center; }

/* ---------- Header / nav ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(10,11,14,.78);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line-soft);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.brand { display: flex; align-items: center; gap: 14px; }
.brand .mark { width: 34px; height: 34px; flex: none; }
.brand .wordmark { font-size: 1.18rem; font-weight: 500; letter-spacing: .04em; color: var(--white); }
.brand .wordmark .two { color: var(--blue); }
.brand .wordmark .labs { font-weight: 300; letter-spacing: .12em; }

.nav-links { display: flex; align-items: center; gap: 34px; list-style: none; margin: 0; padding: 0; }
.nav-links a {
  color: var(--text); font-size: .92rem; letter-spacing: .02em;
  position: relative; padding: 4px 0;
}
.nav-links a:hover, .nav-links a.active { color: var(--white); }
.nav-links a.active::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -2px; height: 1px;
  background: linear-gradient(90deg, var(--blue), var(--blue-lite));
}
.nav-cta {
  border: 1px solid var(--line); border-radius: 6px;
  padding: 9px 18px !important; color: var(--white) !important;
  transition: all .18s ease;
}
.nav-cta:hover { border-color: var(--blue); background: rgba(59,130,246,.08); }

.nav-toggle { display: none; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--white); margin: 4px 0; transition: .2s; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 9px;
  font-size: .95rem; font-weight: 500; letter-spacing: .01em;
  padding: 13px 26px; border-radius: 7px; cursor: pointer;
  border: 1px solid transparent; transition: all .2s ease;
}
.btn-primary {
  background: linear-gradient(180deg, var(--blue) 0%, #2563EB 100%);
  color: #fff; box-shadow: 0 6px 24px rgba(59,130,246,.28);
}
.btn-primary:hover { color: #fff; transform: translateY(-1px); box-shadow: 0 10px 30px rgba(59,130,246,.38); }
.btn-ghost { border-color: var(--line); color: var(--white); }
.btn-ghost:hover { border-color: var(--blue); color: var(--white); background: rgba(59,130,246,.06); }
.btn-row { display: flex; flex-wrap: wrap; gap: 14px; }

/* ---------- Sections ---------- */
section { padding: 88px 0; position: relative; }
.section-tight { padding: 64px 0; }
.divider { height: 1px; background: linear-gradient(90deg, transparent, var(--line), transparent); }

/* ---------- Hero ---------- */
.hero { padding: 116px 0 96px; text-align: center; }
.hero .mark-lg { width: 88px; height: 88px; margin: 0 auto 30px; display: block; }
.hero h1 { max-width: 18ch; margin: 0 auto 22px; }
.hero .grad { background: linear-gradient(90deg, var(--blue-lite), var(--blue)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero .lead { margin: 0 auto 34px; }
.hero .btn-row { justify-content: center; }

/* ---------- Cards ---------- */
.grid { display: grid; gap: 22px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

.card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 30px;
  transition: border-color .2s ease, transform .2s ease, box-shadow .2s ease;
  position: relative;
  display: flex;
  flex-direction: column;
}
.card:hover { border-color: rgba(59,130,246,.5); transform: translateY(-3px); box-shadow: 0 14px 40px rgba(0,0,0,.4); }
.card .ico {
  width: 44px; height: 44px; border-radius: 9px;
  display: grid; place-items: center; margin-bottom: 18px;
  background: rgba(59,130,246,.10); border: 1px solid rgba(59,130,246,.25);
  color: var(--blue-lite);
}
.card h3 { margin-bottom: 10px; }
.card p { font-size: .98rem; margin-bottom: 0; color: var(--text); }
.card .more { align-self: flex-start; margin-top: auto; padding-top: 18px; font-family: var(--mono); font-size: .8rem; letter-spacing: .08em; }

/* ---------- Steps / process ---------- */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; counter-reset: step; }
.step { padding: 24px; border: 1px solid var(--line-soft); border-radius: 10px; background: var(--bg-soft); }
.step .n { font-family: var(--mono); color: var(--blue); font-size: .85rem; letter-spacing: .1em; }
.step h3 { font-size: 1.02rem; margin: 8px 0 6px; }
.step p { font-size: .9rem; margin: 0; color: var(--muted); }

/* ---------- Research list ---------- */
.post {
  display: block; border: 1px solid var(--line); border-radius: 10px;
  padding: 26px 28px; margin-bottom: 16px; background: var(--bg-card);
  transition: border-color .2s ease, transform .2s ease;
}
.post:hover { border-color: rgba(59,130,246,.5); transform: translateX(3px); }
.post .meta { font-family: var(--mono); font-size: .74rem; letter-spacing: .12em; color: var(--muted); text-transform: uppercase; margin-bottom: 9px; }
.post h3 { color: var(--white); margin-bottom: 8px; }
.post p { color: var(--text); font-size: .96rem; margin: 0; }
.tag { display: inline-block; font-family: var(--mono); font-size: .68rem; letter-spacing: .1em; text-transform: uppercase;
       color: var(--blue-lite); border: 1px solid rgba(56,189,248,.3); border-radius: 4px; padding: 3px 9px; margin-left: 10px; }

/* ---------- Callout / external ---------- */
.callout {
  border: 1px solid var(--line); border-radius: 14px; padding: 40px;
  background: linear-gradient(135deg, rgba(59,130,246,.07), rgba(56,189,248,.02));
  display: flex; align-items: center; justify-content: space-between; gap: 30px; flex-wrap: wrap;
}
.callout h2 { margin-bottom: 8px; }
.callout p { margin: 0; max-width: 52ch; }

/* ---------- Service rows ---------- */
.svc { border-top: 1px solid var(--line); padding: 36px 0; display: grid; grid-template-columns: 240px 1fr; gap: 32px; }
.svc:last-child { border-bottom: 1px solid var(--line); }
.svc .svc-h { font-family: var(--mono); font-size: .76rem; letter-spacing: .16em; color: var(--blue); text-transform: uppercase; }
.svc h3 { margin: 6px 0 0; }
.svc ul { margin: 0; padding-left: 18px; color: var(--text); }
.svc ul li { margin-bottom: 8px; font-size: .98rem; }

/* ---------- Form ---------- */
.form { max-width: 640px; }
.field { margin-bottom: 20px; }
.field label { display: block; font-size: .82rem; letter-spacing: .06em; color: var(--muted); margin-bottom: 8px; font-family: var(--mono); text-transform: uppercase; }
.field input, .field textarea, .field select {
  width: 100%; background: var(--bg-soft); border: 1px solid var(--line); border-radius: 8px;
  color: var(--white); padding: 13px 15px; font-family: var(--sans); font-size: 1rem; transition: border-color .18s ease;
}
.field input:focus, .field textarea:focus, .field select:focus { outline: none; border-color: var(--blue); }
.field textarea { resize: vertical; min-height: 130px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.contact-aside { border-left: 1px solid var(--line); padding-left: 34px; }
.contact-aside .label { font-family: var(--mono); font-size: .74rem; letter-spacing: .14em; color: var(--muted); text-transform: uppercase; margin-bottom: 6px; }
.contact-aside .val { color: var(--white); margin-bottom: 26px; display: block; }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--line-soft); padding: 54px 0 40px; margin-top: 40px; }
.footer-grid { display: flex; justify-content: space-between; align-items: flex-start; gap: 40px; flex-wrap: wrap; }
.footer-grid .brand .mark { width: 30px; height: 30px; }
.footer-links { display: flex; gap: 30px; flex-wrap: wrap; }
.footer-links a { color: var(--text); font-size: .9rem; }
.footer-bottom { margin-top: 36px; padding-top: 24px; border-top: 1px solid var(--line-soft);
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; font-size: .82rem; color: var(--muted); }
.footer-bottom .mono { font-family: var(--mono); letter-spacing: .04em; }

/* ---------- Reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .grid-3 { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr 1fr; }
  .svc { grid-template-columns: 1fr; gap: 12px; }
  .contact-aside { border-left: 0; padding-left: 0; border-top: 1px solid var(--line); padding-top: 30px; margin-top: 10px; }
}
@media (max-width: 680px) {
  body { font-size: 16px; }
  .nav-links {
    position: absolute; top: 72px; left: 0; right: 0;
    flex-direction: column; gap: 0; align-items: stretch;
    background: var(--bg-soft); border-bottom: 1px solid var(--line);
    max-height: 0; overflow: hidden; transition: max-height .3s ease;
  }
  .nav-links.open { max-height: 420px; }
  .nav-links li { border-top: 1px solid var(--line-soft); }
  .nav-links a { display: block; padding: 16px 28px; }
  .nav-links a.active::after { display: none; }
  .nav-toggle { display: block; }
  .steps { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  section { padding: 60px 0; }
  .callout { padding: 28px; }
}