/* DO2 Online — shared styles */
:root {
  --bg: #0b1020;
  --bg-alt: #0f1529;
  --surface: #141b33;
  --surface-2: #1a2342;
  --border: #253055;
  --text: #e8ecf8;
  --muted: #9aa6c7;
  --primary: #5b8cff;
  --accent: #22d3a6;
  --gradient: linear-gradient(135deg, var(--primary), var(--accent));
  --radius: 16px;
  --radius-sm: 10px;
  --max: 1160px;
  --shadow: 0 20px 50px -20px rgba(0, 0, 0, .6);
  --font: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-display: "Space Grotesk", var(--font);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
img, svg { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
h1, h2, h3 { font-family: var(--font-display); line-height: 1.15; margin: 0 0 .5em; letter-spacing: -.02em; }
h1 { font-size: clamp(2.3rem, 5.5vw, 4rem); }
h2 { font-size: clamp(1.8rem, 3.5vw, 2.6rem); }
h3 { font-size: 1.2rem; }
p { margin: 0 0 1em; }

.container { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 20px; }
.gradient-text { background: var(--gradient); -webkit-background-clip: text; background-clip: text; color: transparent; }
.skip-link { position: absolute; left: -999px; top: 8px; background: var(--primary); color: #fff; padding: 8px 14px; border-radius: 8px; z-index: 100; }
.skip-link:focus { left: 8px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: .5em;
  padding: .85em 1.4em; border-radius: 999px;
  font-weight: 600; font-size: .98rem; border: 1px solid transparent;
  cursor: pointer; transition: transform .15s ease, box-shadow .2s ease, background .2s ease;
}
.btn-primary { background: var(--gradient); color: #06101f; box-shadow: 0 10px 30px -10px rgba(91, 140, 255, .7); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 34px -10px rgba(34, 211, 166, .7); }
.btn-ghost { border-color: var(--border); color: var(--text); background: transparent; }
.btn-ghost:hover { background: var(--surface); }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(11, 16, 32, .8);
  backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color .2s ease;
}
.site-header.scrolled { border-bottom-color: var(--border); }
.nav { display: flex; align-items: center; justify-content: space-between; height: 72px; gap: 24px; }
.logo { display: flex; align-items: center; gap: 10px; font-family: var(--font-display); font-weight: 700; font-size: 1.25rem; }
.logo img { width: 34px; height: 34px; }
.logo span b { background: var(--gradient); -webkit-background-clip: text; background-clip: text; color: transparent; }
.nav-links { display: flex; align-items: center; gap: 28px; list-style: none; margin: 0; padding: 0; }
.nav-links a { color: var(--muted); font-size: .95rem; font-weight: 500; transition: color .15s; }
.nav-links a:hover { color: var(--text); }
.nav-actions { display: flex; align-items: center; gap: 14px; }
.lang-switch { display: flex; border: 1px solid var(--border); border-radius: 999px; padding: 3px; font-size: .8rem; font-weight: 600; }
.lang-switch a { padding: 4px 10px; border-radius: 999px; color: var(--muted); }
.lang-switch a[aria-current="true"] { background: var(--surface-2); color: var(--text); }
.nav .btn { padding: .6em 1.1em; font-size: .9rem; }
.menu-toggle { display: none; background: none; border: 1px solid var(--border); color: var(--text); border-radius: 10px; width: 42px; height: 42px; cursor: pointer; }
.menu-toggle svg { margin: auto; }

/* Hero */
.hero { position: relative; padding: 96px 0 80px; overflow: hidden; }
.hero::before {
  content: ""; position: absolute; inset: -20% -10% auto auto; width: 720px; height: 720px;
  background: radial-gradient(closest-side, rgba(91, 140, 255, .28), transparent 70%);
  pointer-events: none;
}
.hero::after {
  content: ""; position: absolute; left: -200px; bottom: -300px; width: 600px; height: 600px;
  background: radial-gradient(closest-side, rgba(34, 211, 166, .18), transparent 70%);
  pointer-events: none;
}
.hero-grid { position: relative; z-index: 1; display: grid; grid-template-columns: 1.1fr .9fr; gap: 56px; align-items: center; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: .82rem; font-weight: 600; letter-spacing: .08em; text-transform: uppercase;
  color: var(--accent); background: rgba(34, 211, 166, .08); border: 1px solid rgba(34, 211, 166, .25);
  padding: 6px 12px; border-radius: 999px; margin-bottom: 22px;
}
.eyebrow::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 12px var(--accent); }
.hero p.lead { font-size: 1.2rem; color: var(--muted); max-width: 560px; margin-bottom: 32px; }
.hero-ctas { display: flex; flex-wrap: wrap; gap: 14px; }
.hero-points { display: flex; flex-wrap: wrap; gap: 10px 22px; margin: 32px 0 0; padding: 0; list-style: none; color: var(--muted); font-size: .92rem; }
.hero-points li::before { content: "✓"; color: var(--accent); font-weight: 700; margin-right: 8px; }

/* Hero visual */
.hero-card {
  background: linear-gradient(180deg, var(--surface-2), var(--surface));
  border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow);
  overflow: hidden;
}
.hero-card-bar { display: flex; align-items: center; gap: 7px; padding: 12px 16px; border-bottom: 1px solid var(--border); font-size: .78rem; color: var(--muted); }
.hero-card-bar i { width: 10px; height: 10px; border-radius: 50%; background: #2e3a63; }
.hero-card-bar i:nth-child(1) { background: #ff6b6b; }
.hero-card-bar i:nth-child(2) { background: #ffd166; }
.hero-card-bar i:nth-child(3) { background: #22d3a6; }
.chat { padding: 20px; display: flex; flex-direction: column; gap: 12px; font-size: .9rem; }
.msg { max-width: 88%; padding: 10px 14px; border-radius: 14px; line-height: 1.5; }
.msg.user { align-self: flex-end; background: var(--primary); color: #fff; border-bottom-right-radius: 4px; }
.msg.ai { align-self: flex-start; background: var(--bg-alt); border: 1px solid var(--border); border-bottom-left-radius: 4px; }
.msg.ai small { display: block; margin-top: 8px; color: var(--muted); font-size: .75rem; }
.msg.ai code { font-size: .8rem; color: var(--accent); }
.typing { display: inline-flex; gap: 4px; }
.typing i { width: 6px; height: 6px; border-radius: 50%; background: var(--muted); animation: blink 1.2s infinite both; }
.typing i:nth-child(2) { animation-delay: .2s; }
.typing i:nth-child(3) { animation-delay: .4s; }
@keyframes blink { 0%, 80%, 100% { opacity: .25; } 40% { opacity: 1; } }

/* Sections */
section { padding: 96px 0; }
.section-alt { background: var(--bg-alt); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section-head { max-width: 680px; margin-bottom: 52px; }
.section-head.center { text-align: center; margin-left: auto; margin-right: auto; }
.kicker { color: var(--accent); font-weight: 600; font-size: .85rem; letter-spacing: .1em; text-transform: uppercase; margin-bottom: 10px; }
.section-head p { color: var(--muted); font-size: 1.1rem; }

/* Cards */
.grid { display: grid; gap: 22px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px; transition: transform .2s ease, border-color .2s ease;
}
.card:hover { transform: translateY(-4px); border-color: #34437a; }
.card p { color: var(--muted); margin: 0; font-size: .97rem; }
.icon {
  width: 48px; height: 48px; border-radius: 12px; display: grid; place-items: center; margin-bottom: 18px;
  background: linear-gradient(135deg, rgba(91, 140, 255, .18), rgba(34, 211, 166, .18));
  border: 1px solid rgba(91, 140, 255, .3); color: var(--accent);
}
.icon svg { width: 24px; height: 24px; }
.card ul { margin: 14px 0 0; padding: 0; list-style: none; color: var(--muted); font-size: .9rem; }
.card ul li { padding: 3px 0 3px 20px; position: relative; }
.card ul li::before { content: ""; position: absolute; left: 0; top: .75em; width: 8px; height: 2px; background: var(--accent); }

/* AI section */
.ai-layout { display: grid; grid-template-columns: .9fr 1.1fr; gap: 56px; align-items: start; }
.ai-layout .section-head { margin-bottom: 28px; }
.principles { list-style: none; padding: 0; margin: 0; display: grid; gap: 18px; }
.principles li { display: grid; grid-template-columns: 36px 1fr; gap: 14px; }
.principles .num { width: 36px; height: 36px; border-radius: 50%; display: grid; place-items: center; background: var(--surface-2); border: 1px solid var(--border); font-weight: 700; font-size: .85rem; color: var(--accent); }
.principles strong { display: block; margin-bottom: 2px; }
.principles span { color: var(--muted); font-size: .95rem; }

/* Process */
.steps { counter-reset: step; }
.step { position: relative; padding-top: 56px; }
.step::before {
  counter-increment: step; content: "0" counter(step);
  position: absolute; top: 0; left: 28px;
  font-family: var(--font-display); font-weight: 700; font-size: 2rem;
  background: var(--gradient); -webkit-background-clip: text; background-clip: text; color: transparent;
  margin-top: 20px;
}
.step.card { padding-top: 80px; }

/* Stack */
.stack-group { margin-bottom: 26px; }
.stack-group h3 { font-size: .85rem; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); margin-bottom: 12px; font-family: var(--font); }
.chips { display: flex; flex-wrap: wrap; gap: 10px; }
.chip { padding: 8px 14px; border-radius: 999px; background: var(--surface); border: 1px solid var(--border); font-size: .9rem; }

/* Stats / why */
.why-item h3 { display: flex; align-items: center; gap: 10px; }

/* CTA + Contact */
.contact-wrap {
  display: grid; grid-template-columns: 1fr 1fr; gap: 48px;
  background: linear-gradient(135deg, rgba(91, 140, 255, .12), rgba(34, 211, 166, .08));
  border: 1px solid var(--border); border-radius: 24px; padding: 56px;
}
.contact-info p { color: var(--muted); }
.contact-list { list-style: none; padding: 0; margin: 28px 0 0; display: grid; gap: 14px; }
.contact-list li { display: flex; align-items: center; gap: 12px; }
.contact-list a:hover { color: var(--accent); }
.contact-list .icon { margin: 0; width: 40px; height: 40px; }
.contact-list .icon svg { width: 20px; height: 20px; }
form { display: grid; gap: 16px; }
.field { display: grid; gap: 6px; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
label { font-size: .88rem; font-weight: 600; color: var(--muted); }
input, select, textarea {
  font: inherit; font-size: .97rem; color: var(--text);
  background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 12px 14px; width: 100%; transition: border-color .15s, box-shadow .15s;
}
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(91, 140, 255, .25); }
textarea { min-height: 130px; resize: vertical; }
form .btn { justify-self: start; }
.form-note { font-size: .85rem; color: var(--muted); margin: 0; }
.form-status { font-size: .9rem; color: var(--accent); min-height: 1.4em; margin: 0; }

/* Footer */
.site-footer { border-top: 1px solid var(--border); padding: 40px 0; color: var(--muted); font-size: .9rem; }
.footer-grid { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 20px; }
.footer-links { display: flex; gap: 22px; flex-wrap: wrap; list-style: none; margin: 0; padding: 0; }
.footer-links a:hover { color: var(--text); }

/* Reveal on scroll */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.reveal.visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .typing i { animation: none; }
}

/* Responsive */
@media (max-width: 1000px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .hero-grid, .ai-layout, .contact-wrap { grid-template-columns: 1fr; }
  .hero-card { max-width: 560px; }
}
@media (max-width: 860px) {
  .menu-toggle { display: grid; }
  .nav-links {
    position: absolute; top: 72px; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: var(--bg); border-bottom: 1px solid var(--border);
    padding: 8px 20px 20px; display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a { display: block; padding: 12px 0; border-bottom: 1px solid var(--border); font-size: 1rem; }
  .nav-actions .btn { display: none; }
}
@media (max-width: 640px) {
  body { font-size: 16px; }
  section { padding: 72px 0; }
  .hero { padding: 64px 0 56px; }
  .grid-2, .grid-3, .grid-4, .field-row { grid-template-columns: 1fr; }
  .contact-wrap { padding: 28px 20px; border-radius: 18px; }
  .container { padding: 0 16px; }
}