/* =========================================================
   AskAlejandra — Hoja de estilos
   Identidad: Manual de Identidad Corporativa v1
   Azul Petróleo #0F3D4C · Cobre #C97A40 · Blanco #FFFFFF · Gris Claro #F7F8F9
   Tipografía: Inter (sans serif moderna recomendada)
   ========================================================= */

:root {
  --petrol:        #0F3D4C;
  --petrol-deep:   #0A2C37;
  --petrol-night:  #061c24;
  --copper:        #C97A40;
  --copper-bright: #DB8E50;
  --white:         #FFFFFF;
  --gray:          #F7F8F9;
  --gray-200:      #E7EBED;
  --gray-line:     #DCE2E5;
  --ink:           #16242B;
  --ink-soft:      #4A5C64;
  --ink-faint:     #7C8B92;

  --maxw: 1180px;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow-sm: 0 1px 2px rgba(10,44,55,.06), 0 4px 14px rgba(10,44,55,.06);
  --shadow-md: 0 10px 40px rgba(10,44,55,.12);
  --shadow-lg: 0 30px 80px rgba(6,28,36,.35);
  --ease: cubic-bezier(.22,.61,.36,1);

  --font: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
}

/* ---------- Reset / base ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; overflow-x: hidden; }
body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--white);
  overflow-x: hidden;
  line-height: 1.6;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
h1, h2, h3, h4 { line-height: 1.12; letter-spacing: -0.02em; font-weight: 800; color: var(--ink); overflow-wrap: break-word; }
section { scroll-margin-top: 84px; }

/* ---------- Layout helpers ---------- */
.wrap { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: 24px; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 700; letter-spacing: .12em; text-transform: uppercase;
  color: var(--copper);
}
.eyebrow::before { content: ""; width: 22px; height: 2px; background: var(--copper); border-radius: 2px; }
.section { padding: 96px 0; }
.section--tight { padding: 72px 0; }
.section-head { max-width: 720px; margin-bottom: 52px; }
.section-head h2 { font-size: clamp(28px, 4vw, 42px); margin-top: 14px; }
.section-head p { margin-top: 16px; font-size: 18px; color: var(--ink-soft); }
.bg-gray { background: var(--gray); }
.bg-petrol { background: var(--petrol); color: #DCEAEF; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  font-weight: 700; font-size: 16px; line-height: 1;
  padding: 16px 26px; border-radius: 12px; border: 1px solid transparent;
  transition: transform .18s var(--ease), box-shadow .18s var(--ease), background .18s, color .18s, border-color .18s;
  white-space: nowrap;
}
.btn svg { width: 18px; height: 18px; }
.btn--primary {
  background: var(--copper); color: #fff;
  box-shadow: 0 10px 26px rgba(201,122,64,.32);
}
.btn--primary:hover { background: var(--copper-bright); transform: translateY(-2px); box-shadow: 0 16px 34px rgba(201,122,64,.40); }
.btn--ghost { background: transparent; color: var(--white); border-color: rgba(255,255,255,.28); }
.btn--ghost:hover { border-color: rgba(255,255,255,.7); background: rgba(255,255,255,.06); }
.btn--dark { background: var(--petrol); color: #fff; }
.btn--dark:hover { background: var(--petrol-deep); transform: translateY(-2px); }
.btn--wa { background: #25D366; color: #06351b; box-shadow: 0 10px 26px rgba(37,211,102,.28); }
.btn--wa:hover { transform: translateY(-2px); box-shadow: 0 16px 34px rgba(37,211,102,.36); }
.btn--lg { padding: 18px 32px; font-size: 17px; }

/* ---------- Header ---------- */
.header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: transparent;
  transition: background .3s var(--ease), box-shadow .3s var(--ease), border-color .3s;
  border-bottom: 1px solid transparent;
}
.header.scrolled {
  background: rgba(10,44,55,.92);
  backdrop-filter: saturate(140%) blur(12px);
  border-bottom-color: rgba(255,255,255,.08);
}
.nav { display: flex; align-items: center; justify-content: space-between; gap: 24px; height: 84px; }
.brand { display: flex; align-items: center; }
.brand img { height: 56px; width: auto; }
.nav-links { display: flex; align-items: center; gap: 30px; }
.nav-links a {
  font-size: 15px; font-weight: 600; color: rgba(255,255,255,.82);
  transition: color .15s; position: relative;
}
.nav-links a:hover { color: #fff; }
.nav-right { display: flex; align-items: center; gap: 18px; }

/* language switch */
.lang {
  display: inline-flex; align-items: center; border: 1px solid rgba(255,255,255,.25);
  border-radius: 999px; overflow: hidden; font-size: 13px; font-weight: 700;
}
.lang a { padding: 6px 12px; color: rgba(255,255,255,.7); transition: background .15s, color .15s; }
.lang a.active { background: var(--copper); color: #fff; }
.lang a:not(.active):hover { color: #fff; }

.nav-cta { display: inline-flex; }
.nav-mobile { display: none; }
.burger { display: none; background: none; border: 0; padding: 8px; }
.burger span { display: block; width: 24px; height: 2px; background: #fff; border-radius: 2px; transition: .25s; }
.burger span + span { margin-top: 5px; }

/* ---------- Hero ---------- */
.hero {
  position: relative; overflow: hidden;
  background:
    radial-gradient(1100px 600px at 78% -10%, rgba(201,122,64,.20), transparent 60%),
    radial-gradient(900px 700px at 8% 110%, rgba(20,90,110,.45), transparent 55%),
    linear-gradient(160deg, var(--petrol-night) 0%, var(--petrol-deep) 45%, var(--petrol) 100%);
  color: #EAF2F4;
  padding-top: 104px;
}
.hero__inner { display: grid; grid-template-columns: 1.05fr .95fr; gap: 48px; align-items: center; padding: 70px 0 96px; }
.hero h1 {
  color: #fff; font-size: clamp(34px, 5.2vw, 60px); font-weight: 800;
  letter-spacing: -0.03em; margin-bottom: 22px;
}
.hero h1 .accent { color: var(--copper-bright); }
.hero__sub { font-size: clamp(17px, 1.6vw, 20px); color: #BCD0D6; max-width: 560px; margin-bottom: 34px; }
.hero__actions { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; }
.hero__note { margin-top: 20px; font-size: 14px; color: #8FAAB2; display: flex; align-items: center; gap: 8px; }
.hero__note svg { width: 16px; height: 16px; color: var(--copper-bright); }

.hero__tags { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 26px; }
.tag {
  font-size: 13px; font-weight: 600; color: #CFE0E5;
  background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.12);
  padding: 7px 13px; border-radius: 999px;
}

/* Hero visual: chat mockup + network */
.hero__visual { position: relative; }
.network { position: absolute; inset: -40px -30px auto auto; width: 320px; opacity: .9; pointer-events: none; }
.chat {
  position: relative; z-index: 2;
  background: rgba(255,255,255,.04);
  border: 1px solid rgba(255,255,255,.14);
  border-radius: 22px; padding: 18px; max-width: 420px; margin-left: auto;
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(6px);
}
.chat__bar { display: flex; align-items: center; gap: 10px; padding: 4px 6px 14px; border-bottom: 1px solid rgba(255,255,255,.08); }
.chat__avatar {
  width: 34px; height: 34px; border-radius: 50%;
  background: linear-gradient(135deg, var(--copper), var(--copper-bright));
  display: grid; place-items: center; font-weight: 800; color: #fff; font-size: 15px;
}
.chat__name { font-weight: 700; color: #fff; font-size: 15px; }
.chat__status { font-size: 12px; color: #7FE8A6; display: flex; align-items: center; gap: 5px; }
.chat__status::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: #7FE8A6; }
.chat__body { padding: 16px 4px 4px; display: flex; flex-direction: column; gap: 12px; }
.bubble { font-size: 14.5px; line-height: 1.5; padding: 11px 14px; border-radius: 14px; max-width: 86%; }
.bubble--user { align-self: flex-end; background: var(--copper); color: #fff; border-bottom-right-radius: 5px; }
.bubble--bot { align-self: flex-start; background: rgba(255,255,255,.10); color: #E7F0F2; border-bottom-left-radius: 5px; border: 1px solid rgba(255,255,255,.08); }
.bubble--bot b { color: #fff; }
.bubble small { display:block; opacity:.6; font-size: 11px; margin-top: 4px; }

/* ---------- Logos strip / trust mini ---------- */
.hero__strip { border-top: 1px solid rgba(255,255,255,.10); }
.strip-inner { display: flex; flex-wrap: wrap; align-items: center; gap: 14px 34px; padding: 20px 0; font-size: 14px; color: #9FB8BF; }
.strip-inner strong { color: #fff; }
.strip-divider { width: 1px; height: 16px; background: rgba(255,255,255,.18); }

/* ---------- Problem ---------- */
.problem-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.pcard {
  background: var(--white); border: 1px solid var(--gray-line); border-radius: var(--radius);
  padding: 28px; box-shadow: var(--shadow-sm); transition: transform .2s var(--ease), box-shadow .2s;
}
.pcard:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.pcard .ic { width: 46px; height: 46px; border-radius: 12px; display: grid; place-items: center; background: #FBEFE6; color: var(--copper); margin-bottom: 16px; }
.pcard .ic svg { width: 24px; height: 24px; }
.pcard h3 { font-size: 19px; margin-bottom: 8px; }
.pcard p { color: var(--ink-soft); font-size: 15.5px; }

/* ---------- Solution (split) ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.split h2 { font-size: clamp(26px, 3.6vw, 38px); margin: 14px 0 18px; }
.split p { color: var(--ink-soft); font-size: 17px; }
.checklist { list-style: none; padding: 0; margin: 26px 0 0; display: grid; gap: 14px; }
.checklist li { display: flex; gap: 12px; align-items: flex-start; font-size: 16px; color: var(--ink); }
.checklist .tick { flex: none; width: 24px; height: 24px; border-radius: 50%; background: var(--petrol); color: #fff; display: grid; place-items: center; margin-top: 1px; }
.checklist .tick svg { width: 13px; height: 13px; }
.checklist b { font-weight: 700; }

.solution-panel {
  background: linear-gradient(165deg, var(--petrol) 0%, var(--petrol-deep) 100%);
  border-radius: 22px; padding: 34px; color: #DCEAEF; box-shadow: var(--shadow-md); position: relative; overflow: hidden;
}
.solution-panel::after { content:""; position:absolute; right:-60px; top:-60px; width:180px; height:180px; border-radius:50%; background: radial-gradient(circle, rgba(201,122,64,.30), transparent 70%); }
.spanel-row { display: flex; gap: 14px; padding: 14px 0; border-bottom: 1px solid rgba(255,255,255,.10); position: relative; z-index:1; }
.spanel-row:last-child { border-bottom: 0; }
.spanel-row .num { flex: none; width: 30px; height: 30px; border-radius: 9px; background: var(--copper); color:#fff; font-weight: 800; display: grid; place-items: center; font-size: 14px; }
.spanel-row h4 { color: #fff; font-size: 16px; margin-bottom: 3px; }
.spanel-row p { font-size: 14.5px; color: #AFC6CD; }

/* ---------- How it works ---------- */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; counter-reset: step; }
.step {
  position: relative; background: var(--white); border: 1px solid var(--gray-line);
  border-radius: var(--radius); padding: 28px 24px; box-shadow: var(--shadow-sm);
}
.step__n {
  font-size: 14px; font-weight: 800; color: var(--copper);
  width: 40px; height: 40px; border-radius: 11px; background: #FBEFE6;
  display: grid; place-items: center; margin-bottom: 16px;
}
.step h3 { font-size: 18px; margin-bottom: 8px; }
.step p { font-size: 15px; color: var(--ink-soft); }
.step:not(:last-child)::after {
  content: ""; position: absolute; right: -13px; top: 50%; width: 26px; height: 2px;
  background: var(--gray-line); z-index: 1;
}

/* ---------- Use cases ---------- */
.cases { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.case {
  display: flex; gap: 14px; align-items: flex-start;
  background: var(--white); border: 1px solid var(--gray-line); border-radius: 14px;
  padding: 18px 20px; transition: border-color .2s, transform .2s var(--ease), box-shadow .2s;
}
.case:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: var(--copper); }
.case .q {
  flex: none; width: 38px; height: 38px; border-radius: 10px;
  background: var(--petrol); color: #fff; display: grid; place-items: center; font-size: 18px; font-weight: 800;
}
.case p { font-size: 15.5px; color: var(--ink); }
.case p .said { color: var(--ink-soft); font-style: italic; }
.case--wide { grid-column: 1 / -1; background: linear-gradient(120deg, #FBEFE6, #fff); border-color: #F0D8C4; }

/* ---------- Differentiators ---------- */
.diffs { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.diff { padding: 28px; border-radius: var(--radius); background: rgba(255,255,255,.04); border: 1px solid rgba(255,255,255,.12); }
.bg-petrol .diff h3 { color: #fff; }
.diff .ic { width: 48px; height: 48px; border-radius: 12px; background: rgba(201,122,64,.18); color: var(--copper-bright); display: grid; place-items: center; margin-bottom: 16px; }
.diff .ic svg { width: 25px; height: 25px; }
.diff h3 { font-size: 18px; margin-bottom: 8px; }
.diff p { font-size: 15px; color: #AEC6CD; }

/* ---------- Security highlight ---------- */
.security { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.sec-card {
  background: var(--white); border: 1px solid var(--gray-line); border-radius: 18px;
  padding: 26px; box-shadow: var(--shadow-md);
}
.sec-roles { display: grid; gap: 12px; }
.role { display: flex; align-items: center; gap: 14px; padding: 14px 16px; border-radius: 12px; background: var(--gray); border: 1px solid var(--gray-line); }
.role .av { flex:none; width: 40px; height: 40px; border-radius: 10px; display: grid; place-items: center; color:#fff; font-weight: 800; font-size: 14px; }
.role .av.r1 { background: var(--petrol); }
.role .av.r2 { background: var(--copper); }
.role .av.r3 { background: #5B7780; }
.role .rt { font-weight: 700; font-size: 15px; }
.role .rd { font-size: 13.5px; color: var(--ink-soft); }
.role .lock { margin-left: auto; color: var(--ink-faint); }
.role .lock svg { width: 18px; height: 18px; }

/* ---------- Proof / authority ---------- */
.proof-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; margin-bottom: 44px; }
.stat { text-align: center; padding: 26px; }
.stat .big { font-size: clamp(40px, 6vw, 60px); font-weight: 800; color: var(--copper); letter-spacing: -.03em; line-height: 1; }
.stat .lbl { margin-top: 10px; color: var(--ink-soft); font-size: 15px; }
.bg-petrol .stat .lbl { color: #AEC6CD; }
.industries { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; }
.chip {
  font-size: 14.5px; font-weight: 600; color: var(--petrol);
  background: var(--white); border: 1px solid var(--gray-line); border-radius: 999px; padding: 9px 18px;
}

/* ---------- Final CTA + form ---------- */
.cta {
  background:
    radial-gradient(800px 500px at 85% 0%, rgba(201,122,64,.22), transparent 60%),
    linear-gradient(160deg, var(--petrol-deep), var(--petrol-night));
  color: #EAF2F4;
}
.cta-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: start; }
.cta h2 { color: #fff; font-size: clamp(30px, 4.4vw, 46px); margin-bottom: 18px; }
.cta__lead { color: #BCD0D6; font-size: 18px; margin-bottom: 28px; }
.cta__list { list-style: none; padding: 0; display: grid; gap: 14px; }
.cta__list li { display: flex; gap: 12px; align-items: flex-start; color: #DCEAEF; font-size: 16px; }
.cta__list .tick { flex:none; width: 22px; height: 22px; border-radius: 50%; background: var(--copper); display: grid; place-items: center; }
.cta__list .tick svg { width: 12px; height: 12px; color: #fff; }
.cta__wa { margin-top: 28px; display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.cta__wa span { font-size: 14px; color: #8FAAB2; }

.form-card { background: var(--white); border-radius: 20px; padding: 30px; box-shadow: var(--shadow-lg); color: var(--ink); }
.form-card h3 { font-size: 21px; margin-bottom: 6px; }
.form-card .fc-sub { color: var(--ink-soft); font-size: 15px; margin-bottom: 22px; }
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 13.5px; font-weight: 700; color: var(--ink); margin-bottom: 7px; }
.field input, .field textarea, .field select {
  width: 100%; font-family: inherit; font-size: 15.5px; color: var(--ink);
  padding: 13px 14px; border: 1px solid var(--gray-line); border-radius: 11px; background: var(--gray);
  transition: border-color .15s, box-shadow .15s, background .15s;
}
.field input:focus, .field textarea:focus, .field select:focus {
  outline: 0; border-color: var(--copper); background: #fff; box-shadow: 0 0 0 3px rgba(201,122,64,.16);
}
.field textarea { resize: vertical; min-height: 96px; }
.form-card .btn { width: 100%; }
.form-note { margin-top: 14px; font-size: 12.5px; color: var(--ink-faint); text-align: center; }

/* ---------- Footer ---------- */
.footer { background: var(--petrol-night); color: #9FB8BF; padding: 60px 0 32px; }
.footer-top { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 40px; padding-bottom: 36px; border-bottom: 1px solid rgba(255,255,255,.08); }
.footer img.flogo { height: 54px; margin-bottom: 16px; }
.footer p { font-size: 14.5px; color: #8FAAB2; max-width: 320px; }
.footer h4 { color: #fff; font-size: 14px; text-transform: uppercase; letter-spacing: .08em; margin-bottom: 16px; }
.footer ul { list-style: none; padding: 0; display: grid; gap: 10px; }
.footer ul a { font-size: 14.5px; color: #9FB8BF; transition: color .15s; }
.footer ul a:hover { color: var(--copper-bright); }
.footer-bottom { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 14px; padding-top: 24px; font-size: 13px; color: #6E868E; }
.footer-bottom .legal { display: flex; gap: 22px; flex-wrap: wrap; }

/* ---------- Use-case selector (interactivo por industria) ---------- */
.uc-chips { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin-bottom: 28px; }
.uc-chip {
  font-family: inherit; font-size: 15px; font-weight: 600; color: var(--petrol);
  background: #fff; border: 1px solid var(--gray-line); border-radius: 999px; padding: 10px 18px;
  cursor: pointer; transition: background .18s, color .18s, border-color .18s, transform .18s;
}
.uc-chip:hover { border-color: var(--copper); transform: translateY(-1px); }
.uc-chip.active { background: var(--petrol); color: #fff; border-color: var(--petrol); }
.uc-stage { max-width: 480px; margin: 0 auto; }
.uc-phone {
  background: linear-gradient(165deg, var(--petrol) 0%, var(--petrol-deep) 100%);
  border-radius: 22px; padding: 18px; box-shadow: var(--shadow-md);
}
.uc-panel { display: none; flex-direction: column; gap: 12px; }
.uc-panel.active { display: flex; }
/* indicador "escribiendo…" */
.uc-typing {
  align-self: flex-start; background: rgba(255,255,255,.10); border: 1px solid rgba(255,255,255,.08);
  border-radius: 14px; border-bottom-left-radius: 5px; padding: 13px 16px; display: flex; gap: 5px;
}
.uc-typing span { width: 7px; height: 7px; border-radius: 50%; background: #BCD0D6; animation: ucdot 1s infinite; }
.uc-typing span:nth-child(2) { animation-delay: .15s; }
.uc-typing span:nth-child(3) { animation-delay: .3s; }
@keyframes ucdot { 0%,60%,100% { opacity: .3; transform: translateY(0); } 30% { opacity: 1; transform: translateY(-3px); } }
/* entrada de cada burbuja */
.bubble.uc-in { animation: ucbub .26s var(--ease); }
@keyframes ucbub { from { opacity: 0; transform: translateY(8px) scale(.98); } to { opacity: 1; transform: none; } }
.uc-legend { text-align: center; color: var(--ink-soft); font-size: 13.5px; margin: -16px 0 26px; }

/* ---------- Banda cruzada: software a la medida ---------- */
.crossband {
  display: flex; align-items: center; justify-content: space-between; gap: 28px;
  background: var(--gray); border: 1px solid var(--gray-line); border-radius: 18px; padding: 32px 36px;
}
.crossband h2 { font-size: clamp(22px, 3vw, 30px); margin: 10px 0 10px; }
.crossband p { color: var(--ink-soft); font-size: 16px; max-width: 560px; }
.crossband .btn { flex: none; }
@media (max-width: 760px) { .crossband { flex-direction: column; align-items: flex-start; padding: 26px 22px; } .crossband .btn { width: 100%; } }
.uc-proactive { margin-top: 18px; text-align: center; color: var(--ink-soft); font-size: 15px; }

/* ---------- FAQ ---------- */
.faq { max-width: 820px; margin: 0 auto; display: grid; gap: 12px; }
.faq details {
  background: var(--white); border: 1px solid var(--gray-line); border-radius: 14px;
  padding: 4px 22px; box-shadow: var(--shadow-sm); transition: border-color .2s;
}
.faq details[open] { border-color: var(--copper); }
.faq summary {
  list-style: none; cursor: pointer; font-weight: 700; font-size: 17px; color: var(--ink);
  padding: 18px 0; display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: ""; flex: none; width: 20px; height: 20px;
  background: no-repeat center/contain url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23C97A40' stroke-width='2.5'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  transition: transform .25s var(--ease);
}
.faq details[open] summary::after { transform: rotate(180deg); }
.faq .faq-a { padding: 0 0 20px; }
.faq .faq-a p { color: var(--ink-soft); font-size: 16px; margin: 0; }

/* ---------- Reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity .6s var(--ease), transform .6s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
/* Fallback: si no hay JS o se prefiere menos movimiento, mostrar todo */
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; transition: none; } }

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .hero__inner { grid-template-columns: 1fr; gap: 40px; padding-bottom: 70px; }
  .hero__visual { max-width: 460px; }
  .network { width: 240px; }
  .split, .security, .cta-grid { grid-template-columns: 1fr; gap: 36px; }
  .problem-grid, .diffs, .proof-stats { grid-template-columns: 1fr 1fr; }
  .steps { grid-template-columns: 1fr 1fr; }
  .step:not(:last-child)::after { display: none; }
  .footer-top { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .nav-links, .nav-cta { display: none; }
  .burger { display: block; }
  .nav-mobile {
    position: fixed; inset: 84px 0 auto 0; background: var(--petrol-deep);
    border-bottom: 1px solid rgba(255,255,255,.1); padding: 16px 24px 24px;
    display: none; flex-direction: column; gap: 4px; z-index: 99;
  }
  .nav-mobile.open { display: flex; }
  .nav-mobile a { padding: 12px 4px; color: #DCEAEF; font-weight: 600; border-bottom: 1px solid rgba(255,255,255,.06); }
  .nav-mobile .btn { margin-top: 14px; }
  .section { padding: 64px 0; }
  .problem-grid, .diffs, .proof-stats, .steps, .cases { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; }
  body { font-size: 16px; }
  .hero__visual { max-width: 100%; }
  .chat { max-width: 100%; margin-left: 0; }
  .network { width: 200px; inset: -24px -16px auto auto; }
  .bubble { max-width: 92%; }
}
@media (max-width: 420px) {
  .wrap { padding-inline: 18px; }
  .hero__actions .btn { width: 100%; }
  .hero h1 { font-size: 30px; }
  .brand img { height: 46px; }
}