:root {
  --bg-0: #071018;
  --bg-1: #0c1a24;
  --ink: #e7f2f6;
  --muted: #8aa3ae;
  --accent: #2ec4b6;
  --accent-deep: #1a8f86;
  --danger: #ff6b5a;
  --line: rgba(231, 242, 246, 0.14);
  --focus: rgba(46, 196, 182, 0.45);
  --font-display: "Trebuchet MS", "Segoe UI", Candara, sans-serif;
  --font-body: "Segoe UI", Candara, Geneva, sans-serif;
  --font-mono: "Cascadia Mono", "Consolas", "Courier New", monospace;
}

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

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--bg-0);
  line-height: 1.5;
}

.atmosphere {
  position: fixed;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(1200px 700px at 12% -10%, rgba(46, 196, 182, 0.22), transparent 55%),
    radial-gradient(900px 600px at 90% 20%, rgba(42, 110, 160, 0.28), transparent 50%),
    linear-gradient(165deg, var(--bg-0), var(--bg-1) 55%, #061017);
  animation: drift 18s ease-in-out infinite alternate;
}

.atmosphere::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(231, 242, 246, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(231, 242, 246, 0.035) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
  opacity: 0.55;
}

@keyframes drift {
  from {
    transform: scale(1) translate3d(0, 0, 0);
  }
  to {
    transform: scale(1.04) translate3d(-1.2%, 1%, 0);
  }
}

.stage {
  position: relative;
  z-index: 1;
  max-width: 40rem;
  margin: 0 auto;
  padding: clamp(3.5rem, 12vh, 7rem) 1.5rem 3rem;
  animation: rise 700ms ease-out both;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.brand {
  margin: 0 0 0.85rem;
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 7vw, 3.6rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 0.95;
  color: var(--ink);
}

.headline {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 3.5vw, 1.75rem);
  font-weight: 600;
  letter-spacing: -0.02em;
}

.support {
  margin: 0 0 2rem;
  max-width: 34rem;
  color: var(--muted);
  font-size: 1.02rem;
}

.claim-form {
  display: grid;
  gap: 1.1rem;
}

.field {
  display: grid;
  gap: 0.45rem;
}

.field span {
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}

.field input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 0;
  background: rgba(7, 16, 24, 0.55);
  color: var(--ink);
  font: 1.05rem/1.3 var(--font-mono);
  padding: 0.95rem 1rem;
  outline: none;
  transition: border-color 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.field input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--focus);
  background: rgba(7, 16, 24, 0.8);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  appearance: none;
  border: 1px solid transparent;
  border-radius: 0;
  font: 600 0.95rem/1 var(--font-body);
  letter-spacing: 0.02em;
  padding: 0.95rem 1.25rem;
  cursor: pointer;
  transition: transform 140ms ease, background 140ms ease, border-color 140ms ease, opacity 140ms ease;
}

.btn:hover:not(:disabled) {
  transform: translateY(-1px);
}

.btn:disabled {
  opacity: 0.55;
  cursor: wait;
}

.btn.primary {
  background: var(--accent);
  color: #04201d;
}

.btn.primary:hover:not(:disabled) {
  background: #45d6c8;
}

.btn.ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}

.btn.ghost:hover:not(:disabled) {
  border-color: rgba(46, 196, 182, 0.55);
}

.btn.compact {
  padding: 0.65rem 0.9rem;
  margin-top: 0.75rem;
}

.result {
  margin-top: 1.75rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
  animation: rise 400ms ease-out both;
}

.result-label {
  margin: 0 0 0.4rem;
  color: var(--muted);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.license-key {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(1rem, 2.8vw, 1.2rem);
  letter-spacing: 0.04em;
  word-break: break-all;
  color: var(--accent);
}

.result-note {
  margin: 0.85rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.error {
  margin-top: 1.25rem;
  color: var(--danger);
  font-size: 0.98rem;
}

@media (max-width: 520px) {
  .actions {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }
}