/* Airi Lab — landing page styles. Plain CSS, mobile-first, no build step. */

:root {
  --bg: #060b10;
  --bg-2: #0b141c;
  --bg-3: #0e1a24;
  --cyan: #39e6ff;
  --cyan-2: #8af2ff;
  --cyan-dim: #2bb6d6;
  --text: #e8f6fc;
  --muted: #9db4c2;
  --border: rgba(57, 230, 255, 0.16);
  --border-soft: rgba(57, 230, 255, 0.10);
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.45);
  --radius: 14px;
  --maxw: 1120px;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 22px; }
.narrow { max-width: 760px; }
.center { text-align: center; margin-left: auto; margin-right: auto; }

.skip {
  position: absolute; left: -9999px; top: 0; background: var(--cyan); color: #001018;
  padding: 10px 16px; border-radius: 0 0 8px 0; z-index: 100;
}
.skip:focus { left: 0; }

:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; border-radius: 4px; }

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(6, 11, 16, 0.96);
  backdrop-filter: blur(14px) saturate(120%);
  -webkit-backdrop-filter: blur(14px) saturate(120%);
  border-bottom: 1px solid var(--border-soft);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
}
.header-inner { display: flex; align-items: center; gap: 18px; height: 64px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--cyan); }
.brand-mark { height: 20px; width: auto; display: block; }
.brand-name { color: var(--text); font-weight: 700; letter-spacing: 0.22em; font-size: 15px; white-space: nowrap; }
.brand-word { height: 15px; width: auto; display: block; }
/* logo lockups (hero + footer) */
.hero-logo { margin-bottom: 26px; }
.hero-mark { width: min(360px, 80vw); height: auto; display: block; }
.hero-wordmark { display: inline-block; margin-top: 8px; padding-left: 4px; color: var(--text); font-weight: 600; letter-spacing: 0.4em; font-size: clamp(16px, 2.6vw, 24px); }
.footer-logo { display: flex; align-items: center; gap: 11px; margin-bottom: 8px; }
.footer-mark { height: 20px; width: auto; }
.footer-logo .brand-word { height: 16px; }
/* on phones, the header shows just the waveform mark (the hero carries the full lockup) */
@media (max-width: 479px) { .site-header .brand-name, .site-header .brand-word { display: none; } }
.nav { display: none; margin-left: auto; gap: 26px; }
.nav a { color: var(--muted); font-size: 14px; transition: color .2s; }
.nav a:hover { color: var(--text); }
.header-inner .btn-sm { margin-left: auto; }
.nav + .btn-sm { margin-left: 26px; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  font-weight: 600; font-size: 16px; line-height: 1;
  padding: 14px 22px; border-radius: 11px; border: 1px solid transparent;
  cursor: pointer; transition: transform .15s ease, box-shadow .2s ease, background .2s ease, border-color .2s;
  white-space: nowrap;
}
.btn-sm { padding: 9px 16px; font-size: 14px; }
.btn-primary {
  background: linear-gradient(180deg, var(--cyan-2), var(--cyan));
  color: #00131b; box-shadow: 0 8px 24px rgba(57, 230, 255, 0.28);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 30px rgba(57, 230, 255, 0.42); }
.btn-ghost { background: rgba(57, 230, 255, 0.06); color: var(--text); border-color: var(--border); }
.btn-ghost:hover { border-color: var(--cyan); background: rgba(57, 230, 255, 0.12); }

/* ---------- hero ---------- */
.hero { position: relative; padding: 64px 0 56px; overflow: hidden; }
.hero-inner { position: relative; z-index: 2; max-width: 820px; }
.eyebrow {
  color: var(--cyan); font-size: 13px; letter-spacing: 0.22em; text-transform: uppercase;
  font-weight: 600; margin-bottom: 18px;
}
.hero h1 {
  font-size: clamp(32px, 7vw, 56px); line-height: 1.08; letter-spacing: -0.02em;
  font-weight: 800; margin-bottom: 20px;
}
.lede { font-size: clamp(16px, 2.4vw, 20px); color: var(--muted); max-width: 640px; margin-bottom: 30px; }
.lede strong { color: var(--text); }
.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; }
.center-cta { justify-content: center; }
.hero-note { margin-top: 26px; color: var(--cyan-dim); font-size: 14px; letter-spacing: 0.01em; }
.hero-glow {
  position: absolute; z-index: 1; top: -160px; right: -160px; width: 620px; height: 620px;
  background: radial-gradient(circle, rgba(57, 230, 255, 0.20), rgba(57, 230, 255, 0) 62%);
  pointer-events: none;
}

/* ---------- sections ---------- */
.section { padding: 64px 0; }
.section-alt { background: linear-gradient(180deg, var(--bg-2), var(--bg)); border-top: 1px solid var(--border-soft); border-bottom: 1px solid var(--border-soft); }
.section-title { font-size: clamp(26px, 4.5vw, 38px); line-height: 1.15; letter-spacing: -0.02em; font-weight: 800; margin-bottom: 12px; }
.section-sub { color: var(--muted); font-size: clamp(15px, 2vw, 18px); max-width: 680px; margin-bottom: 36px; }
.center .section-sub { margin-left: auto; margin-right: auto; }

/* ---------- grids / cards ---------- */
.grid { display: grid; gap: 16px; grid-template-columns: 1fr; }
.card {
  background: var(--bg-3); border: 1px solid var(--border-soft); border-radius: var(--radius);
  padding: 24px; transition: transform .18s ease, border-color .2s ease, box-shadow .2s ease;
}
.card:hover { transform: translateY(-3px); border-color: var(--border); box-shadow: var(--shadow); }
.card h3 { font-size: 19px; margin-bottom: 8px; letter-spacing: -0.01em; }
.card p { color: var(--muted); font-size: 15px; }
.icon {
  display: inline-flex; width: 46px; height: 46px; border-radius: 12px; margin-bottom: 16px;
  align-items: center; justify-content: center;
  background: rgba(57, 230, 255, 0.10); border: 1px solid var(--border);
}
.icon svg { width: 24px; height: 24px; fill: none; stroke: var(--cyan); stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

/* ---------- steps ---------- */
.steps { list-style: none; display: grid; gap: 16px; grid-template-columns: 1fr; counter-reset: step; }
.step { background: var(--bg-3); border: 1px solid var(--border-soft); border-radius: var(--radius); padding: 26px 24px; position: relative; }
.step-num {
  display: inline-flex; width: 38px; height: 38px; border-radius: 50%; align-items: center; justify-content: center;
  background: rgba(57, 230, 255, 0.12); border: 1px solid var(--cyan); color: var(--cyan);
  font-weight: 700; font-size: 17px; margin-bottom: 14px;
}
.step h3 { font-size: 20px; margin-bottom: 8px; }
.step p { color: var(--muted); }

/* ---------- cta ---------- */
.cta { background: radial-gradient(circle at 50% 0%, rgba(57, 230, 255, 0.10), rgba(6, 11, 16, 0) 60%); }

/* ---------- footer ---------- */
.site-footer { border-top: 1px solid var(--border-soft); padding: 44px 0 30px; background: var(--bg-2); }
.footer-inner { display: grid; gap: 22px; grid-template-columns: 1fr; }
.footer-brand .brand-name { font-size: 16px; }
.footer-brand p { color: var(--muted); margin-top: 8px; font-size: 14px; }
.footer-meta p { color: var(--muted); font-size: 14px; margin: 4px 0; }
.footer-meta a:hover { color: var(--cyan); }
.footer-base { margin-top: 30px; padding-top: 18px; border-top: 1px solid var(--border-soft); }
.footer-base p { color: #5f7585; font-size: 13px; }

/* ---------- responsive ---------- */
@media (min-width: 640px) {
  .container { padding: 0 28px; }
  .grid-2 { grid-template-columns: 1fr 1fr; }
  .steps { grid-template-columns: repeat(3, 1fr); }
  .footer-inner { grid-template-columns: 1fr auto; align-items: end; }
  .footer-meta { text-align: right; }
}
@media (min-width: 900px) {
  .nav { display: flex; }
  .header-inner .btn-sm { margin-left: 26px; }
  .nav + .btn-sm { margin-left: 26px; }
  .hero { padding: 96px 0 80px; }
  .section { padding: 88px 0; }
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
}

/* ---------- hard-sell outcomes band ---------- */
.outcomes { list-style: none; display: grid; gap: 12px; grid-template-columns: 1fr; margin-top: 44px; }
.outcomes li { position: relative; padding-left: 30px; color: var(--text); font-size: 16px; line-height: 1.5; }
.outcomes li::before {
  content: ""; position: absolute; left: 0; top: 3px; width: 18px; height: 18px; border-radius: 50%;
  background: rgba(57, 230, 255, 0.14); border: 1px solid var(--cyan);
}
.outcomes li::after {
  content: ""; position: absolute; left: 6px; top: 6px; width: 5px; height: 9px;
  border-right: 2px solid var(--cyan); border-bottom: 2px solid var(--cyan); transform: rotate(40deg);
}
@media (min-width: 640px) { .outcomes { grid-template-columns: 1fr 1fr; } }

/* ---------- lead-capture form ---------- */
.lead-form { max-width: 660px; margin: 26px auto 0; text-align: left; }
.form-grid { display: grid; gap: 22px 18px; grid-template-columns: 1fr; }
.field { display: flex; flex-direction: column; gap: 7px; }
.field label { font-size: 13px; color: var(--muted); letter-spacing: 0.04em; font-weight: 600; }
.field .req { color: var(--cyan); }
.field input, .field select, .field textarea {
  width: 100%; background: var(--bg-3); color: var(--text);
  border: 1px solid var(--border); border-radius: 11px; padding: 13px 14px;
  font: inherit; font-size: 15px; transition: border-color .2s, box-shadow .2s;
}
.field input::placeholder, .field textarea::placeholder { color: #5f7585; }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--cyan); box-shadow: 0 0 0 3px rgba(57, 230, 255, 0.14);
}
.field textarea { resize: vertical; min-height: 96px; }
.field select { appearance: none; -webkit-appearance: none; cursor: pointer; }
.form-actions { margin-top: 22px; display: flex; flex-direction: column; align-items: center; gap: 14px; }
.form-actions .btn { width: 100%; max-width: 340px; }
.form-note { color: #7c93a3; font-size: 13px; text-align: center; margin-top: 2px; }
.form-alt { color: var(--muted); font-size: 14px; text-align: center; }
.form-alt a { color: var(--cyan); }
.form-alt a:hover { text-decoration: underline; }
@media (min-width: 640px) {
  .form-grid { grid-template-columns: 1fr 1fr; }
  .field.full { grid-column: 1 / -1; }
}
.closing-line { margin: 30px 0 24px; color: var(--text); font-weight: 600; font-size: clamp(16px, 2.1vw, 19px); max-width: 760px; }