:root {
  color-scheme: dark;
  --snap-yellow: #fffc00;
  --snap-yellow-soft: #fff45c;
  --snap-yellow-dim: rgba(255, 252, 0, 0.22);
  --snap-black: #000000;
  --snap-text: #ffffff;
  --snap-muted: #d4d4d4;
  --snap-danger: #ff6b6b;
  --snap-ok: #7dffb3;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.45);
  font-family: "Avenir Next", "Helvetica Neue", "SF Pro Text", "Segoe UI", system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 15% 0%, rgba(255, 252, 0, 0.35), transparent 40%),
    radial-gradient(circle at 85% 10%, rgba(255, 252, 0, 0.18), transparent 35%),
    linear-gradient(180deg, #000000, #000000);
  color: var(--snap-text);
}

.pair-shell {
  min-height: 100vh;
}

.pair-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  max-width: 100%;
  margin: 0;
  padding: 18px 24px;
  background: var(--snap-yellow);
  border-bottom: 4px solid var(--snap-black);
}

.pair-brand {
  color: var(--snap-black);
  text-decoration: none;
  font-weight: 900;
  letter-spacing: 0.08em;
  font-size: 1.1rem;
}

.pair-topbar-tag {
  color: var(--snap-black);
  font-size: 0.82rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 800;
  opacity: 0.75;
}

.pair-page {
  max-width: 760px;
  margin: 0 auto;
  padding: 28px 20px 72px;
}

.pair-hero h1,
.pair-card h2 {
  margin: 0;
}

.pair-hero h1 {
  margin-top: 8px;
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  line-height: 1.05;
  letter-spacing: -0.04em;
  font-weight: 900;
  color: var(--snap-yellow);
}

.pair-lead {
  margin: 14px 0 0;
  color: var(--snap-muted);
  line-height: 1.6;
  max-width: 52ch;
  font-size: 1.05rem;
}

.pair-card {
  margin-top: 28px;
  padding: 24px;
  border: 2px solid var(--snap-yellow);
  border-radius: 22px;
  background: linear-gradient(180deg, rgba(18, 18, 18, 0.98), rgba(0, 0, 0, 0.98));
  box-shadow: 0 0 0 1px rgba(255, 252, 0, 0.12), var(--shadow);
  backdrop-filter: blur(12px);
}

.pair-card h2 {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--snap-yellow);
}

.pair-auth {
  margin-top: 18px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.pair-btn {
  appearance: none;
  border: 0;
  border-radius: 999px;
  padding: 15px 22px;
  font-size: 1rem;
  font-weight: 800;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  text-decoration: none;
  transition: transform 0.12s ease, box-shadow 0.12s ease, opacity 0.12s ease;
}

.pair-btn:hover {
  transform: translateY(-1px);
}

.pair-btn:active {
  transform: translateY(0);
}

.pair-btn-google {
  background: #ffffff;
  color: #000000;
  border: 2px solid rgba(255, 255, 255, 0.12);
}

.pair-btn-primary {
  background: var(--snap-yellow);
  color: var(--snap-black);
  box-shadow: 0 10px 30px rgba(255, 252, 0, 0.35);
}

.pair-btn-primary:hover {
  box-shadow: 0 14px 34px rgba(255, 252, 0, 0.45);
}

.pair-btn-ghost {
  background: transparent;
  color: var(--snap-muted);
  border: 1px solid rgba(255, 252, 0, 0.35);
}

.pair-btn-ghost:hover {
  color: var(--snap-yellow);
  border-color: var(--snap-yellow);
}

.pair-google-mark {
  display: inline-flex;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: #4285f4;
  background: #fff;
  font-size: 0.92rem;
}

.pair-muted {
  margin: 10px 0 0;
  color: var(--snap-muted);
  font-size: 0.95rem;
  line-height: 1.5;
}

.pair-result {
  min-height: 1.4em;
  margin: 18px 0 0;
  font-size: 0.98rem;
  line-height: 1.5;
  font-weight: 600;
}

.pair-result.ok {
  color: var(--snap-yellow);
}

.pair-result.err {
  color: var(--snap-danger);
}

.pair-status-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.pair-status-list li {
  display: grid;
  grid-template-columns: 14px 1fr auto;
  gap: 12px;
  align-items: center;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid rgba(255, 252, 0, 0.28);
  background: rgba(0, 0, 0, 0.45);
}

.pair-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.35);
}

.pair-status-list li.is-ok .pair-dot {
  background: var(--snap-ok);
  box-shadow: 0 0 10px rgba(125, 255, 179, 0.55);
}

.pair-status-list li.is-bad .pair-dot {
  background: var(--snap-danger);
  box-shadow: 0 0 10px rgba(255, 107, 107, 0.45);
}

.pair-status-label {
  font-weight: 700;
  color: var(--snap-text);
}

.pair-status-value {
  color: var(--snap-muted);
  font-size: 0.92rem;
  text-align: right;
}

.pair-steps ol {
  margin: 14px 0 0;
  padding-left: 1.2rem;
  color: var(--snap-muted);
  line-height: 1.8;
}

.pair-steps strong {
  color: var(--snap-yellow);
}

@media (min-width: 640px) {
  .pair-auth {
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
  }

  .pair-auth .pair-muted {
    flex: 1 1 100%;
  }

  .pair-btn {
    width: auto;
    min-width: 220px;
  }
}

.pair-field-label {
  display: block;
  margin: 16px 0 8px;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--snap-muted);
}

.pair-select {
  width: 100%;
  appearance: none;
  -webkit-appearance: none;
  border-radius: 14px;
  border: 1px solid rgba(255, 252, 0, 0.35);
  background: rgba(0, 0, 0, 0.55)
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%23fffc00' d='M1 1l5 5 5-5'/%3E%3C/svg%3E")
    no-repeat right 14px center;
  color: var(--snap-text);
  font: inherit;
  font-size: 1rem;
  font-weight: 600;
  padding: 14px 40px 14px 14px;
  outline: none;
}

.pair-select:focus {
  border-color: var(--snap-yellow);
  box-shadow: 0 0 0 2px rgba(255, 252, 0, 0.2);
}

.pair-select:disabled {
  opacity: 0.55;
}