/* ============================================================
   ecoAIR Cloud — light, clean identity
   Sampled from brand: white bg, near-black ink, cobalt accent,
   periwinkle circles. Distinct from 4Control's dark-green system.
   ============================================================ */

:root {
  --ink: #14161c;
  --ink-soft: #3d4350;
  --ink-faint: #6b7280;
  --paper: #ffffff;
  --paper-warm: #f6f7fb;
  --paper-warm-2: #eef1f8;
  --cobalt: #2f43e0;
  --cobalt-deep: #2233b8;
  --periwinkle: #cdd5f7;
  --periwinkle-soft: #e4e9fb;
  --line: #e6e8f0;
  --radius: 18px;
  --radius-lg: 28px;
  --maxw: 1180px;
  --shadow-sm: 0 2px 8px rgba(20, 22, 28, 0.05);
  --shadow-md: 0 18px 50px rgba(31, 43, 120, 0.10);
  --shadow-lg: 0 40px 90px rgba(31, 43, 120, 0.16);
  --font-display: 'Onest', system-ui, -apple-system, sans-serif;
  --font-body: 'Onest', system-ui, -apple-system, sans-serif;
}

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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-body);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.6;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 28px; }

h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 700; line-height: 1.08; letter-spacing: -0.02em; color: var(--ink); }

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

em { font-style: normal; color: var(--cobalt); }

.kicker {
  display: inline-flex; align-items: center; gap: 9px;
  font-size: 13px; font-weight: 600; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--cobalt);
}
.kicker::before {
  content: ""; width: 11px; height: 11px; border-radius: 50%;
  background: var(--cobalt); box-shadow: 0 0 0 5px var(--periwinkle-soft);
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 15px 28px; border-radius: 999px; font-weight: 600;
  font-size: 15px; cursor: pointer; border: 1.5px solid transparent;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
  white-space: nowrap;
}
.btn--primary { background: var(--cobalt); color: #fff; box-shadow: 0 10px 26px rgba(47, 67, 224, 0.30); }
.btn--primary:hover { background: var(--cobalt-deep); transform: translateY(-2px); box-shadow: 0 16px 34px rgba(47, 67, 224, 0.38); }
.btn--ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn--ghost:hover { border-color: var(--cobalt); color: var(--cobalt); transform: translateY(-2px); }

/* ---------- nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 28px; background: rgba(255,255,255,0.82);
  backdrop-filter: blur(14px); border-bottom: 1px solid var(--line);
}
.nav__brand img { height: 34px; display: block; }
.nav__links { display: flex; gap: 30px; }
.nav__links a { font-size: 15px; font-weight: 500; color: var(--ink-soft); transition: color .15s; }
.nav__links a:hover { color: var(--cobalt); }
.nav__cta { display: inline-flex; align-items: center; gap: 7px; font-size: 15px; font-weight: 600; color: var(--cobalt); }
.nav__toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 6px; }
.nav__toggle span { width: 24px; height: 2px; background: var(--ink); border-radius: 2px; transition: .25s; }

/* ---------- hero ---------- */
.hero { position: relative; padding: 76px 0 40px; overflow: hidden; }
.hero__bg {
  position: absolute; inset: 0; z-index: 0;
  background:
    radial-gradient(circle at 78% 18%, var(--periwinkle-soft) 0%, transparent 46%),
    radial-gradient(circle at 12% 88%, #eaf0ff 0%, transparent 40%);
}
.hero__inner { position: relative; z-index: 1; display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 40px; align-items: center; }
.hero__eyebrow { margin-bottom: 22px; }
.hero__title { font-size: clamp(2.4rem, 5vw, 4rem); margin-bottom: 22px; }
.hero__lede { font-size: 1.18rem; color: var(--ink-soft); max-width: 30em; margin-bottom: 30px; }
.hero__cta-row { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 30px; }
.hero__pills { display: flex; flex-wrap: wrap; gap: 10px; }
.hero__pills span {
  font-size: 13px; font-weight: 600; color: var(--ink-soft);
  background: #fff; border: 1px solid var(--line); border-radius: 999px;
  padding: 7px 15px; box-shadow: var(--shadow-sm);
}

.hero__device { position: relative; display: flex; align-items: center; justify-content: center; }
.hero__device-glow {
  position: absolute; width: 86%; height: 86%; border-radius: 50%;
  background: radial-gradient(circle, var(--periwinkle) 0%, transparent 68%);
  filter: blur(10px); z-index: 0;
}
.hero__device img { position: relative; z-index: 1; width: 100%; max-width: 520px; filter: drop-shadow(0 30px 50px rgba(20,22,40,0.28)); }

/* ---------- generic section ---------- */
.section { padding: 78px 0; }
.section--tint { background: var(--paper-warm); }
.section__head { max-width: 720px; margin: 0 auto 52px; text-align: center; }
.section__head .kicker { margin-bottom: 16px; }
.section__title { font-size: clamp(1.9rem, 3.6vw, 2.9rem); margin-bottom: 16px; }
.section__sub { font-size: 1.1rem; color: var(--ink-soft); }

/* ---------- value props (3) ---------- */
.values { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.value {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg);
  padding: 34px 30px; box-shadow: var(--shadow-sm); transition: transform .2s, box-shadow .2s;
}
.value:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.value__icon {
  width: 52px; height: 52px; border-radius: 14px; margin-bottom: 20px;
  background: var(--periwinkle-soft); display: flex; align-items: center; justify-content: center;
}
.value__icon svg { width: 26px; height: 26px; stroke: var(--cobalt); }
.value h3 { font-size: 1.3rem; margin-bottom: 10px; }
.value p { color: var(--ink-soft); font-size: 1rem; }

/* ---------- feature grid (6) ---------- */
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius-lg); overflow: hidden; }
.feature { background: #fff; padding: 34px 30px; }
.feature__num { font-size: 13px; font-weight: 700; color: var(--cobalt); letter-spacing: 0.1em; margin-bottom: 14px; }
.feature h3 { font-size: 1.18rem; margin-bottom: 9px; }
.feature p { color: var(--ink-soft); font-size: 0.98rem; }

/* ---------- expandable / sensor split ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.split__media {
  background: var(--paper-warm-2); border-radius: var(--radius-lg); padding: 40px;
  display: flex; align-items: center; justify-content: center; min-height: 320px;
}
.split__media img { max-width: 100%; border-radius: var(--radius); box-shadow: var(--shadow-md); }
.split h2 { font-size: clamp(1.8rem, 3.2vw, 2.6rem); margin-bottom: 16px; }
.split p { color: var(--ink-soft); font-size: 1.08rem; margin-bottom: 14px; }
.split ul { list-style: none; display: grid; gap: 12px; margin-top: 20px; }
.split li { display: flex; gap: 12px; align-items: flex-start; color: var(--ink-soft); }
.split li::before { content: "✓"; color: var(--cobalt); font-weight: 700; flex-shrink: 0; }

/* ---------- process (4 steps) ---------- */
.process { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.step { text-align: center; }
.step__circle {
  width: 96px; height: 96px; border-radius: 50%; margin: 0 auto 20px; position: relative;
  background: var(--periwinkle-soft); display: flex; align-items: center; justify-content: center;
}
.step__circle svg { width: 40px; height: 40px; stroke: var(--cobalt); fill: none; }
.step__num {
  position: absolute; top: -4px; right: -4px; width: 30px; height: 30px; border-radius: 50%;
  background: var(--cobalt); color: #fff; font-size: 13px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
}
.step h3 { font-size: 1.18rem; margin-bottom: 10px; }
.step p { color: var(--ink-soft); font-size: 0.98rem; }

/* ---------- FAQ ---------- */
.faq { max-width: 820px; margin: 0 auto; display: grid; gap: 14px; }
.faq__item { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.faq__q { width: 100%; text-align: left; background: none; border: none; cursor: pointer;
  padding: 22px 26px; font-size: 1.12rem; font-weight: 600; font-family: var(--font-display);
  color: var(--ink); display: flex; justify-content: space-between; align-items: center; gap: 16px; }
.faq__q::after { content: "+"; color: var(--cobalt); font-size: 1.5rem; font-weight: 400; transition: transform .2s; flex-shrink: 0; }
.faq__item[open] .faq__q::after { transform: rotate(45deg); }
.faq__a { padding: 0 26px 24px; color: var(--ink-soft); }
.faq__a p { margin-bottom: 10px; }

/* ---------- contact ---------- */
.contact { background: var(--ink); color: #fff; border-radius: var(--radius-lg); padding: 56px; position: relative; overflow: hidden; }
.contact__bg { position: absolute; inset: 0; background: radial-gradient(circle at 85% 15%, rgba(47,67,224,0.4) 0%, transparent 50%); }
.contact__grid { position: relative; z-index: 1; display: grid; grid-template-columns: 0.85fr 1.15fr; gap: 48px; }
.contact h2 { color: #fff; font-size: clamp(1.8rem, 3.2vw, 2.6rem); margin-bottom: 16px; }
.contact__intro p { color: rgba(255,255,255,0.7); margin-bottom: 26px; }
.contact__detail { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; color: rgba(255,255,255,0.85); font-size: 0.98rem; }
.contact__detail svg { width: 20px; height: 20px; stroke: var(--periwinkle); flex-shrink: 0; }

.form { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form__field { display: flex; flex-direction: column; gap: 6px; }
.form__field--full { grid-column: 1 / -1; }
.form__field label { font-size: 13px; font-weight: 600; color: rgba(255,255,255,0.85); }
.form__field label .req { color: var(--periwinkle); }
.form input, .form select, .form textarea {
  background: rgba(255,255,255,0.07); border: 1px solid rgba(255,255,255,0.16); border-radius: 11px;
  padding: 13px 15px; color: #fff; font-family: var(--font-body); font-size: 15px; width: 100%;
  transition: border-color .15s, background .15s;
}
.form input::placeholder, .form textarea::placeholder { color: rgba(255,255,255,0.4); }
.form input:focus, .form select:focus, .form textarea:focus { outline: none; border-color: var(--cobalt); background: rgba(255,255,255,0.12); }
.form select option { background: var(--ink); color: #fff; }
.form textarea { resize: vertical; min-height: 90px; }
.form__submit { grid-column: 1 / -1; }
.form__submit button { width: 100%; justify-content: center; }
.form__status { grid-column: 1 / -1; font-size: 0.95rem; padding: 12px; border-radius: 10px; display: none; }
.form__recaptcha { grid-column: 1 / -1; margin-top: 2px; }
.form__status--ok { display: block; background: rgba(70,200,130,0.15); color: #7ff0b0; border: 1px solid rgba(70,200,130,0.35); }
.form__status--err { display: block; background: rgba(240,90,90,0.15); color: #ff9b9b; border: 1px solid rgba(240,90,90,0.35); }

/* ---------- footer ---------- */
.footer { background: var(--paper-warm); border-top: 1px solid var(--line); padding: 54px 0 30px; }
.footer__inner { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 36px; margin-bottom: 36px; }
.footer__brand img { height: 36px; margin-bottom: 16px; }
.footer__brand p { color: var(--ink-faint); font-size: 0.95rem; max-width: 26em; }
.footer__cols h4 { font-size: 14px; margin-bottom: 14px; }
.footer__cols a, .footer__cols span.muted { display: block; color: var(--ink-faint); font-size: 0.95rem; margin-bottom: 9px; transition: color .15s; }
.footer__cols a:hover { color: var(--cobalt); }
.footer__base { border-top: 1px solid var(--line); padding-top: 22px; display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; color: var(--ink-faint); font-size: 0.88rem; }

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  .nav__links, .nav__cta { display: none; }
  .nav__toggle { display: flex; }
  .nav__links.open { display: flex; position: absolute; top: 100%; left: 0; right: 0; flex-direction: column; background: #fff; padding: 20px 28px; gap: 18px; border-bottom: 1px solid var(--line); }
  .hero__inner { grid-template-columns: 1fr; }
  .hero__device { order: -1; }
  .hero__device img { max-width: 360px; }
  .values, .features, .process { grid-template-columns: 1fr; }
  .features { border-radius: var(--radius-lg); }
  .split { grid-template-columns: 1fr; gap: 28px; }
  .contact { padding: 36px 24px; }
  .contact__grid { grid-template-columns: 1fr; gap: 32px; }
  .form { grid-template-columns: 1fr; }
  .footer__inner { grid-template-columns: 1fr 1fr; gap: 28px; }
}
@media (max-width: 540px) {
  .footer__inner { grid-template-columns: 1fr; }
  .container { padding: 0 20px; }
}