/* invite.dopamineapp.ru — standalone invite landing.
   Self-contained: no external fonts, scripts, images or CDN requests.
   Palette mirrors activity_tracker/landing (lime / ink / paper). */

:root {
  --lime: #d8ff3e;
  --ink: #11110f;
  --paper: #f4f0e7;
  --orange: #ff5c35;
  --blue: #583bff;
  --muted: #6d6b64;
  --line: rgba(17, 17, 15, 0.16);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--paper);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, Helvetica, sans-serif;
  display: flex;
  flex-direction: column;
}

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

.topbar {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 1.2rem clamp(1.2rem, 5vw, 3rem);
  border-bottom: 1px solid var(--line);
  font-size: 0.8rem;
  font-weight: 900;
  letter-spacing: 0.12em;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  background: var(--ink);
  color: var(--lime);
  border-radius: 50%;
  font-size: 1.2rem;
  font-style: italic;
}

main {
  flex: 1;
  width: 100%;
  max-width: 620px;
  margin: 0 auto;
  padding: clamp(2rem, 7vw, 3.5rem) clamp(1.2rem, 5vw, 2rem) 3rem;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-size: 0.68rem;
  font-weight: 900;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin: 0 0 1.4rem;
}

.eyebrow i {
  width: 34px;
  height: 4px;
  background: var(--orange);
  display: inline-block;
}

h1 {
  font-size: clamp(2.6rem, 11vw, 4rem);
  line-height: 0.86;
  letter-spacing: -0.05em;
  font-weight: 900;
  margin: 0 0 1.3rem;
  text-transform: uppercase;
}

h1 em { font-style: normal; color: var(--blue); }

.deck {
  font-size: 1.05rem;
  line-height: 1.5;
  margin: 0 0 2rem;
  max-width: 30rem;
}

/* ── steps ─────────────────────────────────────────────────────────────── */

.steps {
  list-style: none;
  counter-reset: step;
  padding: 0;
  margin: 0 0 2rem;
  border-top: 1px solid var(--line);
}

.steps li {
  counter-increment: step;
  border-bottom: 1px solid var(--line);
  padding: 0.95rem 0 0.95rem 2.6rem;
  position: relative;
  line-height: 1.45;
  font-size: 0.95rem;
}

.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0.85rem;
  display: grid;
  place-items: center;
  width: 1.85rem;
  height: 1.85rem;
  border: 1px solid var(--ink);
  border-radius: 50%;
  font-size: 0.7rem;
  font-weight: 900;
}

/* ── buttons ───────────────────────────────────────────────────────────── */

.actions { display: flex; flex-direction: column; gap: 0.85rem; margin-bottom: 1.6rem; }

.button {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: 100%;
  border: 2px solid var(--ink);
  background: var(--paper);
  color: var(--ink);
  padding: 1.1rem 1.25rem;
  font: inherit;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-size: 0.86rem;
  cursor: pointer;
  text-align: left;
  transition: transform 0.15s, box-shadow 0.15s;
}

.button b { display: block; }
.button small {
  display: block;
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  opacity: 0.7;
  margin-top: 0.25rem;
  text-transform: none;
}

.button:hover:not([aria-disabled="true"]) {
  transform: translate(-3px, -3px);
  box-shadow: 5px 5px 0 var(--ink);
}

.button:focus-visible { outline: 3px solid var(--blue); outline-offset: 3px; }

.button-primary { background: var(--lime); }
.button-secondary { background: transparent; }

.button[aria-disabled="true"] {
  cursor: default;
  border-style: dashed;
  color: var(--muted);
  background: transparent;
}

.arrow { font-size: 1.1rem; }

.note {
  font-size: 0.75rem;
  line-height: 1.5;
  color: var(--muted);
  margin: 0 0 1.6rem;
}

.hint {
  border: 1px solid var(--line);
  background: #fff;
  padding: 0.9rem 1rem;
  font-size: 0.82rem;
  line-height: 1.45;
  margin: 0 0 1.6rem;
}

/* ── code block ────────────────────────────────────────────────────────── */

.code-block {
  border: 2px solid var(--ink);
  background: var(--ink);
  color: #fff;
  padding: 1.1rem 1.2rem;
  margin-bottom: 1.4rem;
}

.code-label {
  font-size: 0.62rem;
  font-weight: 900;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--lime);
  margin: 0 0 0.6rem;
}

.code-row { display: flex; align-items: center; gap: 0.8rem; flex-wrap: wrap; }

#inviteCode {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: clamp(1.25rem, 6vw, 1.7rem);
  font-weight: 700;
  letter-spacing: 0.06em;
  word-break: break-all;
  flex: 1 1 auto;
  min-width: 0;
}

#copyBtn {
  flex: 0 0 auto;
  border: 2px solid var(--lime);
  background: transparent;
  color: var(--lime);
  font: inherit;
  font-weight: 900;
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.65rem 0.9rem;
  cursor: pointer;
}

#copyBtn:hover { background: var(--lime); color: var(--ink); }
#copyBtn:focus-visible { outline: 3px solid var(--lime); outline-offset: 3px; }

.code-help {
  margin: 0.9rem 0 0;
  font-size: 0.78rem;
  line-height: 1.5;
  color: #b9bab4;
}

/* ── invalid state ─────────────────────────────────────────────────────── */

.invalid-card {
  border: 2px solid var(--ink);
  background: var(--orange);
  color: #fff;
  padding: 1.4rem;
}

.invalid-card h2 {
  margin: 0 0 0.7rem;
  font-size: 1.35rem;
  line-height: 1.1;
  letter-spacing: -0.02em;
  text-transform: uppercase;
}

.invalid-card p { margin: 0; line-height: 1.5; font-size: 0.92rem; }

footer {
  border-top: 1px solid var(--line);
  padding: 1.3rem clamp(1.2rem, 5vw, 3rem);
  font-size: 0.7rem;
  color: var(--muted);
}

[hidden] { display: none !important; }

@media (prefers-reduced-motion: reduce) {
  .button { transition: none; }
  .button:hover:not([aria-disabled="true"]) { transform: none; }
}