/* ============================================================
   AEREL — SEO landing pages design system
   Standalone, self-contained (no Tailwind / no build step).
   Matches the live aerel.ru aesthetic: light #f0f0f0 canvas,
   deep-navy ink, Helvetica, glassmorphism, soft mesh, big radii.
   Used by: /dlya-stomatologii, /dlya-kosmetologii,
            /dlya-vetkliniki, /ii-administrator
   ============================================================ */

@font-face {
  font-family: "Helvetica Regular";
  src: url("https://db.onlinewebfonts.com/t/a64ff11d2c24584c767f6257e880dc65.woff2") format("woff2"),
       url("https://db.onlinewebfonts.com/t/a64ff11d2c24584c767f6257e880dc65.woff") format("woff");
  font-display: swap;
}

:root {
  --bg: #f0f0f0;
  --ink: rgba(30, 50, 90, 0.92);
  --ink-strong: rgba(30, 50, 90, 1);
  --ink-9: rgba(30, 50, 90, 0.9);
  --ink-7: rgba(30, 50, 90, 0.7);
  --ink-6: rgba(30, 50, 90, 0.6);
  --ink-5: rgba(30, 50, 90, 0.5);
  --ink-line: rgba(30, 50, 90, 0.1);
  --ink-line-soft: rgba(30, 50, 90, 0.08);
  --ink-fade: rgba(30, 50, 90, 0.05);
  --glass: rgba(255, 255, 255, 0.55);
  --glass-strong: rgba(255, 255, 255, 0.72);
  --glass-soft: rgba(255, 255, 255, 0.35);
  --shadow-card: 0 8px 30px rgba(30, 50, 90, 0.06);
  --shadow-lift: 0 18px 50px -18px rgba(30, 50, 90, 0.28);
  --radius-lg: 2rem;
  --radius-md: 1.5rem;
  --radius-sm: 1.1rem;
  --font: "Helvetica Regular", -apple-system, BlinkMacSystemFont, "Segoe UI",
    Roboto, "Helvetica Neue", Arial, sans-serif;
  --wrap: 1200px;
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.55;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img, video, svg { max-width: 100%; display: block; }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--ink-9);
  color: #fff;
  padding: 12px 18px;
  border-radius: 0 0 12px 0;
  z-index: 200;
}
.skip-link:focus { left: 0; }

/* ---------- layout ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: 24px;
}
.section { padding-block: clamp(56px, 9vw, 104px); }
.section-head { max-width: 720px; margin-bottom: clamp(32px, 5vw, 56px); }

/* ---------- typography ---------- */
.eyebrow {
  display: inline-block;
  font-size: 0.76rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--ink-5);
  margin-bottom: 16px;
}
h1, h2, h3, h4 { font-weight: 400; color: var(--ink); margin: 0; }
h1 {
  font-size: clamp(2.4rem, 6.2vw, 4.6rem);
  line-height: 1.04;
  letter-spacing: -0.025em;
}
h2 {
  font-size: clamp(1.95rem, 4vw, 3rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
}
h3 {
  font-size: clamp(1.2rem, 2vw, 1.5rem);
  line-height: 1.2;
  letter-spacing: -0.015em;
}
.lead {
  font-size: clamp(1.05rem, 1.6vw, 1.3rem);
  color: var(--ink-7);
  line-height: 1.55;
  max-width: 38ch;
}
p { color: var(--ink-7); }
.muted { color: var(--ink-6); }
.nowrap { white-space: nowrap; }

.wordmark {
  font-weight: 500;
  letter-spacing: 0.18em;
  font-size: 1.05rem;
  color: var(--ink-9);
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  border: none;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.98rem;
  border-radius: 999px;
  padding: 13px 26px;
  transition: transform 0.18s ease, box-shadow 0.25s ease, background 0.25s ease;
  white-space: nowrap;
}
.btn:active { transform: scale(0.97); }
.btn-primary {
  background: var(--ink-9);
  color: #fff;
  box-shadow: 0 10px 28px -10px rgba(30, 50, 90, 0.55);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 16px 36px -12px rgba(30, 50, 90, 0.6); }
.btn-ghost {
  background: var(--glass);
  color: var(--ink-9);
  border: 1px solid var(--ink-line);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
}
.btn-ghost:hover { transform: translateY(-2px); background: var(--glass-strong); }
.btn .arrow {
  display: inline-flex;
  width: 26px; height: 26px;
  border-radius: 999px;
  align-items: center; justify-content: center;
  background: rgba(255, 255, 255, 0.18);
  font-size: 0.9rem;
}
.btn-primary .arrow { background: rgba(255, 255, 255, 0.16); }
.btn-ghost .arrow { background: var(--ink-fade); }

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(240, 240, 240, 0.7);
  backdrop-filter: blur(18px) saturate(150%);
  -webkit-backdrop-filter: blur(18px) saturate(150%);
  border-bottom: 1px solid var(--ink-line-soft);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  height: 68px;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
  margin: 0; padding: 0;
}
.nav-links a { color: var(--ink-7); font-size: 0.95rem; transition: color 0.2s; }
.nav-links a:hover { color: var(--ink-9); }
.nav-cta { display: flex; align-items: center; gap: 14px; }
.nav-login { color: var(--ink-6); font-size: 0.95rem; }
.nav-login:hover { color: var(--ink-9); }

/* ---------- hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  padding: clamp(36px, 6vw, 64px) 0 clamp(48px, 7vw, 88px);
}
.hero-mesh {
  position: absolute;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(ellipse 70% 60% at 16% 24%, rgba(190, 210, 235, 0.85) 0%, transparent 60%),
    radial-gradient(ellipse 60% 70% at 84% 72%, rgba(255, 235, 220, 0.55) 0%, transparent 65%),
    radial-gradient(ellipse 80% 50% at 50% 102%, rgba(170, 195, 225, 0.7) 0%, transparent 70%),
    linear-gradient(135deg, #e9eef5 0%, #f5f0eb 50%, #e3eaf3 100%);
  animation: meshDrift 24s ease-in-out infinite alternate;
}
@keyframes meshDrift {
  0%   { background-position: 0% 0%, 100% 100%, 50% 50%, 0% 0%; filter: hue-rotate(0deg); }
  50%  { background-position: 10% 20%, 85% 80%, 55% 60%, 0% 0%; filter: hue-rotate(-4deg); }
  100% { background-position: 5% 10%, 90% 90%, 45% 55%, 0% 0%; filter: hue-rotate(2deg); }
}
.hero-inner { position: relative; z-index: 1; max-width: 880px; }
.hero h1 { margin-bottom: 22px; }
.hero .lead { max-width: 50ch; margin-bottom: 32px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; }
.hero-trust {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  font-size: 0.9rem;
  color: var(--ink-6);
}
.hero-trust span { display: inline-flex; align-items: center; gap: 8px; }
.hero-trust .dot { width: 6px; height: 6px; border-radius: 999px; background: var(--ink-5); }

/* ---------- breadcrumb ---------- */
.breadcrumb {
  position: relative;
  z-index: 1;
  font-size: 0.85rem;
  color: var(--ink-5);
  margin-bottom: 26px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.breadcrumb a:hover { color: var(--ink-9); }
.breadcrumb .sep { opacity: 0.5; }

/* ---------- cards / glass ---------- */
.glass {
  background: var(--glass);
  border: 1px solid var(--ink-line-soft);
  border-radius: var(--radius-md);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
}
.grid { display: grid; gap: 16px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.feature {
  padding: 28px;
  border-radius: var(--radius-md);
  background: var(--glass);
  border: 1px solid var(--ink-line-soft);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.feature:hover { transform: translateY(-4px); box-shadow: var(--shadow-card); }
.feature .ic {
  width: 46px; height: 46px;
  border-radius: 999px;
  display: flex; align-items: center; justify-content: center;
  background: var(--ink-fade);
  border: 1px solid var(--ink-line);
  margin-bottom: 18px;
}
.feature .ic svg { width: 21px; height: 21px; stroke: var(--ink-9); }
.feature h3 { margin-bottom: 10px; }
.feature p { font-size: 0.95rem; color: var(--ink-6); margin: 0; }

/* ---------- problem band ---------- */
.band {
  border-radius: var(--radius-lg);
  padding: clamp(28px, 4vw, 56px);
  background: var(--ink-9);
  color: #fff;
  position: relative;
  overflow: hidden;
}
.band h2 { color: #fff; }
.band .lead { color: rgba(255, 255, 255, 0.78); }
.band .problem-grid { margin-top: 36px; }
.problem {
  padding: 22px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
}
.problem h3 { color: #fff; font-size: 1.05rem; margin-bottom: 8px; }
.problem p { color: rgba(255, 255, 255, 0.7); font-size: 0.92rem; margin: 0; }

/* ---------- steps ---------- */
.steps { counter-reset: step; }
.step { padding: 26px; border-radius: var(--radius-md); background: var(--glass); border: 1px solid var(--ink-line-soft); position: relative; }
.step .num {
  font-size: 0.8rem; letter-spacing: 0.2em; color: var(--ink-5);
  margin-bottom: 14px; display: block;
}
.step h3 { margin-bottom: 8px; }
.step p { font-size: 0.93rem; color: var(--ink-6); margin: 0; }

/* ---------- integration chips ---------- */
.chips { display: flex; flex-wrap: wrap; gap: 12px; }
.chip {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 13px 20px;
  border-radius: 999px;
  background: var(--glass-strong);
  border: 1px solid var(--ink-line);
  font-size: 0.95rem; color: var(--ink-9);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  transition: transform 0.2s ease;
}
.chip:hover { transform: translateY(-2px); }
.chip .dotc { width: 8px; height: 8px; border-radius: 999px; background: var(--ink-6); }
.chip.accent { background: var(--ink-9); color: #fff; }
.chip.accent .dotc { background: rgba(255, 255, 255, 0.8); }

/* ---------- trust / security ---------- */
.trust-list { list-style: none; margin: 0; padding: 0; }
.trust-list li {
  display: flex; gap: 16px; padding: 20px 0;
  border-top: 1px solid var(--ink-line-soft);
}
.trust-list li:first-child { border-top: none; }
.trust-list .ic {
  width: 42px; height: 42px; border-radius: 999px; flex: none;
  display: flex; align-items: center; justify-content: center;
  background: var(--ink-fade); border: 1px solid var(--ink-line);
}
.trust-list .ic svg { width: 19px; height: 19px; stroke: var(--ink-9); }
.trust-list h4 { font-size: 1.05rem; margin-bottom: 5px; }
.trust-list p { font-size: 0.9rem; color: var(--ink-6); margin: 0; }

/* ---------- FAQ (native <details>) ---------- */
.faq { display: grid; gap: 12px; }
.faq details {
  border-radius: var(--radius-sm);
  background: var(--glass);
  border: 1px solid var(--ink-line-soft);
  padding: 0 22px;
  transition: background 0.2s ease;
}
.faq details[open] { background: var(--glass-strong); }
.faq summary {
  list-style: none;
  cursor: pointer;
  padding: 20px 0;
  font-size: 1.05rem;
  color: var(--ink-9);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary .plus {
  flex: none;
  width: 30px; height: 30px;
  border-radius: 999px;
  background: var(--ink-fade);
  border: 1px solid var(--ink-line);
  display: flex; align-items: center; justify-content: center;
  transition: transform 0.25s ease;
  font-size: 1.1rem; color: var(--ink-9); line-height: 1;
}
.faq details[open] summary .plus { transform: rotate(45deg); }
.faq .answer { padding: 0 0 22px; color: var(--ink-7); font-size: 0.97rem; max-width: 70ch; }

/* ---------- final CTA + form ---------- */
.cta-final {
  border-radius: var(--radius-lg);
  padding: clamp(32px, 5vw, 64px);
  background: var(--ink-9);
  color: #fff;
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: clamp(32px, 5vw, 64px);
  align-items: center;
}
.cta-final h2 { color: #fff; margin-bottom: 16px; }
.cta-final p { color: rgba(255, 255, 255, 0.78); }
.cta-points { list-style: none; padding: 0; margin: 24px 0 0; display: grid; gap: 12px; }
.cta-points li { display: flex; gap: 12px; align-items: center; color: rgba(255, 255, 255, 0.85); font-size: 0.97rem; }
.cta-points .check {
  width: 22px; height: 22px; border-radius: 999px; flex: none;
  background: rgba(255, 255, 255, 0.14);
  display: flex; align-items: center; justify-content: center; font-size: 0.7rem;
}

.lead-form {
  background: #fff;
  border-radius: var(--radius-md);
  padding: clamp(24px, 3vw, 34px);
  display: grid;
  gap: 12px;
}
.lead-form h3 { color: var(--ink); margin-bottom: 2px; }
.lead-form .form-sub { font-size: 0.9rem; color: var(--ink-6); margin: 0 0 8px; }
.field {
  width: 100%;
  border: 1px solid var(--ink-line);
  background: rgba(255, 255, 255, 0.9);
  color: var(--ink);
  border-radius: 14px;
  padding: 13px 16px;
  font-family: inherit;
  font-size: 0.97rem;
  outline: none;
  transition: border-color 0.2s ease;
}
.field:focus { border-color: rgba(30, 50, 90, 0.45); }
select.field { appearance: none; -webkit-appearance: none; background-image: none; }
.lead-form button { width: 100%; justify-content: center; margin-top: 4px; }
.form-consent { font-size: 0.76rem; color: var(--ink-5); margin: 4px 0 0; line-height: 1.5; }
.form-consent a { text-decoration: underline; }
.form-status { font-size: 0.95rem; text-align: center; margin: 6px 0 0; min-height: 1px; }
.form-status.ok { color: rgba(30, 120, 60, 0.95); }
.form-status.err { color: rgba(180, 40, 40, 0.95); }

/* ---------- footer ---------- */
.site-footer {
  border-top: 1px solid var(--ink-line-soft);
  padding-block: 48px;
  margin-top: 24px;
}
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 28px; }
.footer-col h4 { font-size: 0.78rem; letter-spacing: 0.18em; text-transform: uppercase; color: var(--ink-5); margin-bottom: 16px; }
.footer-col ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.footer-col a { color: var(--ink-7); font-size: 0.93rem; }
.footer-col a:hover { color: var(--ink-9); }
.footer-about p { font-size: 0.92rem; color: var(--ink-6); max-width: 32ch; margin: 12px 0 0; }
.footer-bottom {
  margin-top: 36px; padding-top: 22px;
  border-top: 1px solid var(--ink-line-soft);
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px;
  font-size: 0.85rem; color: var(--ink-5);
}

/* ---------- scroll reveal (JS-gated; visible if no JS) ---------- */
.js .reveal { opacity: 0; transform: translateY(22px); }
.js .reveal.in { opacity: 1; transform: none; transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.22, 1, 0.36, 1); }
.js .reveal.d1.in { transition-delay: 0.06s; }
.js .reveal.d2.in { transition-delay: 0.12s; }
.js .reveal.d3.in { transition-delay: 0.18s; }

/* ---------- responsive ---------- */
@media (max-width: 980px) {
  .cta-final { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 860px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .nav-links { display: none; }
}
@media (max-width: 600px) {
  .wrap { padding-inline: 18px; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero-actions .btn { flex: 1 1 auto; justify-content: center; }
}

@media (prefers-reduced-motion: reduce) {
  .hero-mesh { animation: none; }
  .js .reveal { opacity: 1; transform: none; }
  html { scroll-behavior: auto; }
}