/* Палитра и градиенты — как на курсах addcod.com, чтобы проекты смотрелись
   одной семьёй: синий → фиолетовый → пурпурный на глубоком тёмном фоне. */
:root {
  --bg: #0e1016;
  --bg-elev: #161922;
  --border: #262b37;
  --text: #e8ecf7;
  --muted: #8b93a3;
  --accent: #2f6bff;
  --accent-2: #7d5bff;
  --accent-3: #a13bff;
  --accent-soft: #1a2540;
  --ok: #3fb950;
  --err: #ff6b6b;
  --radius: 16px;
  --grad: linear-gradient(135deg, #2f6bff, #7d5bff 55%, #a13bff);
  --grad-soft: linear-gradient(160deg, rgba(47,107,255,.10), rgba(161,59,255,.06));
}
* { box-sizing: border-box; }
body {
  margin: 0; color: var(--text);
  background:
    radial-gradient(1100px 620px at 12% -8%, rgba(47,107,255,.16), transparent 62%),
    radial-gradient(900px 560px at 88% 4%, rgba(161,59,255,.13), transparent 60%),
    linear-gradient(180deg, #10131b 0%, #0c0e14 100%);
  background-attachment: fixed;
  font: 16px/1.65 -apple-system, "Segoe UI", Roboto, Inter, sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: #7aa2ff; text-decoration: none; }
a:hover { text-decoration: underline; }
main { max-width: 960px; margin: 0 auto; padding: 28px 20px 72px; }

.top {
  display: flex; align-items: center; justify-content: space-between;
  max-width: 960px; margin: 0 auto; padding: 20px;
}
.brand { font-size: 21px; font-weight: 800; color: var(--text); letter-spacing: -.02em; }
.brand span {
  background: var(--grad); -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.top nav { display: flex; gap: 20px; align-items: center; }
.muted { color: var(--muted); }

/* --- герой --- */
.pill {
  display: inline-block; font-size: 13px; color: #a9c0ff;
  border: 1px solid rgba(125,91,255,.30);
  background: linear-gradient(120deg, rgba(47,107,255,.14), rgba(161,59,255,.10));
  padding: 6px 14px; border-radius: 999px; margin-bottom: 20px;
}
.hero h1 {
  font-size: clamp(32px, 5.4vw, 50px); line-height: 1.12; margin: 6px 0 18px;
  letter-spacing: -.03em;
  background: linear-gradient(180deg, #ffffff 30%, #b9c3dd 100%);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.lead { color: var(--muted); font-size: 17px; max-width: 640px; }
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }
.steps { display: flex; gap: 10px; flex-wrap: wrap; margin: 30px 0 8px; }
.steps div {
  background: var(--grad-soft); border: 1px solid var(--border);
  border-radius: 999px; padding: 9px 18px; font-size: 14px;
}
.steps b {
  margin-right: 8px; background: var(--grad);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; font-weight: 800;
}

h2 { margin-top: 52px; font-size: 24px; letter-spacing: -.02em; }
.section-note { color: var(--muted); font-size: 14px; margin-top: -4px; }

/* --- карточки --- */
.grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fill, minmax(275px, 1fr)); }
.grid.three { grid-template-columns: repeat(auto-fit, minmax(245px, 1fr)); }
.grid.two { grid-template-columns: repeat(auto-fit, minmax(285px, 1fr)); }
.card, .feat, .inst, .cta-box, .pricebox, details, .stat {
  background: linear-gradient(180deg, rgba(22,25,34,.92), rgba(16,19,27,.92));
  border: 1px solid var(--border); border-radius: var(--radius);
}
.card {
  display: block; padding: 20px; color: var(--text); position: relative;
  overflow: hidden; transition: border-color .18s, transform .18s, box-shadow .18s;
}
.card::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 2px;
  background: var(--grad); opacity: 0; transition: opacity .18s;
}
.card:hover {
  border-color: rgba(125,91,255,.45); text-decoration: none;
  transform: translateY(-3px); box-shadow: 0 14px 38px rgba(47,107,255,.13);
}
.card:hover::before { opacity: 1; }
.card.soon { opacity: .62; }
.card h3 { margin: 0 0 8px; font-size: 18px; }
.card p { margin: 0 0 18px; color: var(--muted); font-size: 14px; }
.row { display: flex; align-items: center; justify-content: space-between; }

.price { font-size: 21px; font-weight: 800; letter-spacing: -.02em; }
.price small { color: var(--muted); font-weight: 400; font-size: 13px; }
.tag {
  font-size: 12px; padding: 5px 11px; border-radius: 999px;
  background: rgba(139,147,163,.10); color: var(--muted); border: 1px solid var(--border);
}
.tag.ok {
  color: #9fd6a8; border-color: rgba(63,185,80,.32);
  background: rgba(63,185,80,.10);
}

/* --- кнопки --- */
.btn {
  display: inline-block; background: var(--grad); color: #fff;
  font-weight: 650; padding: 12px 22px; border-radius: 12px; border: 0;
  cursor: pointer; font-size: 15px; box-shadow: 0 8px 22px rgba(75,86,255,.22);
  transition: transform .15s, box-shadow .15s, filter .15s;
}
.btn:hover {
  text-decoration: none; filter: brightness(1.07);
  transform: translateY(-1px); box-shadow: 0 12px 28px rgba(75,86,255,.30);
}
.btn.big { width: 100%; text-align: center; padding: 15px; font-size: 16px; }
.big-inline { padding: 14px 28px; font-size: 16px; }
.btn.small { padding: 8px 15px; font-size: 13px; box-shadow: none; }
.btn.ghost {
  background: rgba(255,255,255,.03); color: var(--text);
  border: 1px solid var(--border); box-shadow: none;
}
.btn.ghost:hover { border-color: rgba(125,91,255,.45); }

.back { color: var(--muted); font-size: 14px; }
.detail .desc { white-space: pre-line; color: var(--muted); margin: 20px 0 28px; }
.pricebox {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 22px; flex-wrap: wrap;
}
.pricebox > div { display: flex; align-items: center; gap: 14px; }

.howto { color: var(--muted); padding-left: 20px; }
.howto.tight li { margin: 5px 0; }
.note { color: var(--muted); font-size: 13px; }
code {
  background: rgba(47,107,255,.10); border: 1px solid rgba(47,107,255,.18);
  padding: 2px 7px; border-radius: 7px; font-size: 13px;
}

.narrow { max-width: 540px; margin: 0 auto; }
.narrow-wide { max-width: 780px; margin: 0 auto; }
.center { text-align: center; }
.narrow h1 { font-size: 30px; letter-spacing: -.02em; }
.waiting { color: var(--muted); font-size: 14px; text-align: center; margin-top: 20px; }

/* --- формы --- */
.form { display: flex; flex-direction: column; gap: 18px; margin-top: 24px; }
.form label { display: flex; flex-direction: column; gap: 7px; font-size: 14px; color: var(--muted); }
.form input {
  background: rgba(11,13,19,.85); border: 1px solid var(--border); color: var(--text);
  border-radius: 12px; padding: 13px 15px; font-size: 15px; font-family: inherit;
  transition: border-color .15s, box-shadow .15s;
}
.form input:focus {
  outline: none; border-color: rgba(125,91,255,.55);
  box-shadow: 0 0 0 3px rgba(125,91,255,.13);
}
.form small { color: #6b7280; font-size: 12px; }

.err { color: #ffb4b4; background: rgba(255,107,107,.10); border: 1px solid rgba(255,107,107,.30);
       padding: 12px 15px; border-radius: 12px; font-size: 14px; }
.err-inline { color: var(--err); font-size: 13px; }
.ok-box { color: #9fd6a8; background: rgba(63,185,80,.10); border: 1px solid rgba(63,185,80,.30);
          padding: 12px 15px; border-radius: 12px; font-size: 14px; }

/* --- содержательные блоки --- */
.feat { padding: 20px; }
.feat h3 { margin: 0 0 9px; font-size: 16px; }
.feat p { margin: 0; color: var(--muted); font-size: 14px; }

details { padding: 15px 19px; margin-bottom: 11px; }
details summary { cursor: pointer; font-weight: 650; }
details[open] summary { color: #a9c0ff; }
details p { color: var(--muted); font-size: 14px; margin: 11px 0 0; }

.bigsteps { list-style: none; counter-reset: s; padding: 0; margin: 30px 0; }
.bigsteps li { counter-increment: s; position: relative; padding-left: 56px; margin-bottom: 28px; }
.bigsteps li::before {
  content: counter(s); position: absolute; left: 0; top: 0;
  width: 36px; height: 36px; border-radius: 50%; background: var(--grad);
  color: #fff; display: flex; align-items: center; justify-content: center;
  font-weight: 800; box-shadow: 0 6px 18px rgba(75,86,255,.28);
}
.bigsteps h3 { margin: 5px 0 6px; font-size: 17px; }
.bigsteps p { margin: 0; color: var(--muted); font-size: 15px; }

.cta-box {
  display: flex; align-items: center; justify-content: space-between; gap: 18px;
  flex-wrap: wrap; margin-top: 40px; padding: 24px;
  background: var(--grad-soft), linear-gradient(180deg, rgba(22,25,34,.92), rgba(16,19,27,.92));
  border-color: rgba(125,91,255,.28);
}
.cta-box h3 { margin: 0 0 5px; font-size: 17px; }
.cta-box p { margin: 0; font-size: 14px; }

.pricetable { width: 100%; border-collapse: collapse; margin: 26px 0; }
.pricetable th {
  text-align: left; font-size: 13px; color: var(--muted); font-weight: 500;
  border-bottom: 1px solid var(--border); padding: 9px 10px;
}
.pricetable td { padding: 15px 10px; border-bottom: 1px solid var(--border); vertical-align: top; }
.nowrap { white-space: nowrap; }
.small { font-size: 13px; }

.checks { list-style: none; padding: 0; color: var(--muted); }
.checks li { padding-left: 28px; position: relative; margin-bottom: 9px; }
.checks li::before { content: "✓"; position: absolute; left: 0; color: #7aa2ff; font-weight: 700; }
.checks.minus li::before { content: "—"; color: var(--muted); }

.doc h2 { font-size: 19px; margin-top: 32px; }
.doc p, .doc li { color: var(--muted); font-size: 15px; }

/* --- кабинет и админка --- */
.inst { padding: 20px; margin-bottom: 15px; }
.inst-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; }
.inst-head h3 { margin: 0 0 3px; font-size: 17px; }
.state { font-size: 12px; padding: 5px 11px; border-radius: 999px; border: 1px solid var(--border); }
.state.on { color: #9fd6a8; border-color: rgba(63,185,80,.32); background: rgba(63,185,80,.10); }
.state.off { color: var(--muted); }
.inst-meta { display: flex; gap: 16px; flex-wrap: wrap; color: var(--muted);
             font-size: 13px; margin: 12px 0 15px; }
.inst-actions { display: flex; gap: 9px; flex-wrap: wrap; align-items: center; }
.inst-actions button, .btn-link {
  background: rgba(255,255,255,.03); border: 1px solid var(--border); color: var(--text);
  border-radius: 10px; padding: 9px 15px; font-size: 13px; cursor: pointer;
  font-family: inherit; transition: border-color .15s;
}
.inst-actions button:hover, .btn-link:hover {
  border-color: rgba(125,91,255,.45); text-decoration: none;
}
.inst-actions button:disabled { opacity: .5; cursor: default; }
.inst-actions .danger:hover { border-color: rgba(255,107,107,.5); color: var(--err); }
.logs {
  margin-top: 15px; background: rgba(11,13,19,.9); border: 1px solid var(--border);
  border-radius: 12px; padding: 13px; max-height: 340px; overflow: auto;
  font-size: 12px; color: var(--muted); white-space: pre-wrap;
}

.stats { display: flex; gap: 13px; flex-wrap: wrap; margin: 22px 0 30px; }
.stat { padding: 16px 22px; min-width: 128px; }
.stat b {
  display: block; font-size: 26px; letter-spacing: -.02em;
  background: var(--grad); -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.stat span { color: var(--muted); font-size: 13px; }

footer {
  max-width: 960px; margin: 0 auto; padding: 26px 20px 44px;
  border-top: 1px solid var(--border); color: var(--muted); font-size: 13px;
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
}

.burger { display: none; background: none; border: 0; color: var(--text);
          font-size: 22px; cursor: pointer; }
@media (max-width: 700px) {
  .burger { display: block; }
  .top { flex-wrap: wrap; }
  .top nav { display: none; width: 100%; flex-direction: column; align-items: flex-start;
             gap: 13px; padding-top: 16px; }
  .top nav.open { display: flex; }
  .cta-box, .pricebox { flex-direction: column; align-items: flex-start; }
  .hero h1 { font-size: 32px; }
}

.inst-actions .pay {
  border-color: rgba(63,185,80,.4); color: #9fd6a8;
}
.inst-actions .pay:hover { border-color: var(--ok); background: rgba(63,185,80,.10); }