/* ============================================================
   AION Nexus — внутренние страницы сайта
   ============================================================ */

.subhero {
  position: relative; padding-top: 140px; padding-bottom: clamp(40px, 6vw, 72px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 90% at 85% -10%, oklch(0.598 0.171 24 / 0.10), transparent 55%),
    var(--bg-1);
}
.subhero .kicker { margin-bottom: 18px; }
.subhero h1 { font-size: clamp(40px, 7vw, 88px); line-height: 0.98; letter-spacing: 0.01em; }
.subhero h1 .accent { color: var(--accent); }
.subhero p.lede { margin-top: 22px; max-width: 640px; color: var(--muted); font-size: clamp(16px, 1.8vw, 20px); }

.content { padding-block: clamp(56px, 8vw, 100px); }
.content .wrap { display: grid; gap: clamp(28px, 4vw, 56px); }

/* generic card grid */
.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 20px; }
.card {
  border: 1px solid var(--line-2); border-radius: 6px; padding: 26px;
  background: var(--bg-2); display: flex; flex-direction: column; gap: 14px;
  transition: border-color .25s ease, transform .25s ease, background .25s ease;
}
.card:hover { border-color: var(--accent-line); transform: translateY(-4px); background: rgba(236,228,236,0.03); }
.card .sig { width: 44px; height: 44px; display: grid; place-items: center; border: 1px solid var(--accent-line); border-radius: 4px; color: var(--accent); }
.card .sig svg { width: 22px; height: 22px; }
.card h3 { font-family: var(--display); font-size: 24px; }
.card p { color: var(--muted); font-size: 15px; line-height: 1.62; }
.card .meta { font-family: var(--mono); font-size: 12px; color: var(--faint); letter-spacing: 0.04em; }

/* steps */
.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 18px; counter-reset: step; }
.step { border: 1px solid var(--line); border-radius: 6px; padding: 24px; background: var(--bg-1); position: relative; }
.step::before {
  counter-increment: step; content: counter(step);
  font-family: var(--display); font-size: 30px; color: var(--accent);
  display: block; margin-bottom: 12px;
}
.step h4 { font-family: var(--body); font-weight: 700; font-size: 17px; margin-bottom: 8px; }
.step p { color: var(--muted); font-size: 14.5px; line-height: 1.6; }

/* download buttons */
.dl-row { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 8px; }
.dl-note { font-family: var(--mono); font-size: 12.5px; color: var(--faint); margin-top: 14px; letter-spacing: 0.03em; }
.btn[disabled] { opacity: .5; cursor: not-allowed; pointer-events: none; }

/* FAQ */
.faq { display: flex; flex-direction: column; gap: 0; border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); padding: 22px 4px; }
.faq summary {
  cursor: pointer; list-style: none; display: flex; align-items: center; justify-content: space-between; gap: 18px;
  font-family: var(--display); font-size: clamp(20px, 2.2vw, 26px); color: var(--text);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary .chev { width: 20px; height: 20px; color: var(--accent); transition: transform .25s ease; flex-shrink: 0; }
.faq details[open] summary .chev { transform: rotate(45deg); }
.faq p { color: var(--muted); font-size: 15.5px; line-height: 1.65; margin-top: 14px; max-width: 70ch; }

/* contact form */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; max-width: 720px; }
.form-grid .full { grid-column: 1 / -1; }
.field label { display: block; font-family: var(--mono); font-size: 12px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); margin-bottom: 8px; }
.field input, .field textarea, .field select {
  width: 100%; padding: 13px 15px; border-radius: 4px;
  background: var(--bg-1); border: 1px solid var(--line-2); color: var(--text);
  font-family: var(--body); font-size: 15px; transition: border-color .2s ease;
}
.field input:focus, .field textarea:focus, .field select:focus { outline: none; border-color: var(--accent); }
.field textarea { min-height: 140px; resize: vertical; }
.contact-aside { display: flex; flex-direction: column; gap: 18px; }
.contact-aside .row { display: flex; gap: 14px; align-items: baseline; border-bottom: 1px solid var(--line); padding-bottom: 16px; }
.contact-aside .row .k { font-family: var(--mono); font-size: 12px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--faint); min-width: 120px; }
.contact-aside .row .v { color: var(--text); font-size: 15px; }

/* split layout for support page */
.split { display: grid; grid-template-columns: 1.4fr 1fr; gap: clamp(28px, 4vw, 56px); align-items: start; }
@media (max-width: 860px) { .split { grid-template-columns: 1fr; } .form-grid { grid-template-columns: 1fr; } }

.alert { padding: 12px 16px; border-radius: 4px; font-size: 14px; margin-bottom: 16px; }
.alert-ok { background: var(--accent-dim); border: 1px solid var(--accent-line); color: var(--text); }