:root {
  --bg: #0b0d12;
  --header: rgba(17, 19, 24, 0.92);
  --panel: #141820;
  --field: #0f1218;
  --border: rgba(255, 255, 255, 0.08);
  --text: #eef1f6;
  --muted: #8b93a7;
  --gold: #e8c547;
  --gold-dim: rgba(232, 197, 71, 0.14);
  --danger: #f87171;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { min-height: 100%; }
body {
  font-family: Inter, system-ui, sans-serif;
  background:
    radial-gradient(900px 480px at 12% 20%, rgba(232, 197, 71, 0.07), transparent 55%),
    radial-gradient(700px 400px at 90% 80%, rgba(59, 130, 246, 0.06), transparent 50%),
    var(--bg);
  color: var(--text);
  display: flex;
  flex-direction: column;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 36px;
  background: var(--header);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 20;
}
.logo { display: flex; align-items: center; text-decoration: none; }
.logo img {
  display: block;
  height: 46px;
  width: auto;
  max-width: min(420px, 58vw);
  object-fit: contain;
  border-radius: 8px;
}
nav ul { list-style: none; display: flex; gap: 8px; }
nav a {
  color: var(--muted); text-decoration: none; font-size: 0.86rem; font-weight: 500;
  padding: 8px 12px; border-radius: 8px;
}
nav a:hover { color: var(--text); background: rgba(255,255,255,0.04); }

.auth-container {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 36px 24px 48px;
}
.auth-layout {
  width: 100%;
  max-width: 980px;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(320px, 380px);
  gap: 48px;
  align-items: center;
}
.multi-api-panel { min-width: 0; }
.multi-api-panel img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 18px;
  background: transparent;
  mix-blend-mode: screen;
}
.multi-api-caption {
  margin-top: 12px;
  color: var(--muted);
  font-size: 0.82rem;
  letter-spacing: 0.2px;
}
.auth-box {
  background: var(--panel);
  border: 1px solid var(--border);
  padding: 32px 28px;
  border-radius: 16px;
  width: 100%;
}
.auth-box h2 {
  font-size: 1.45rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}
.auth-box > p {
  font-size: 0.86rem;
  margin-bottom: 22px;
  color: var(--muted);
}

.form-group { margin-bottom: 14px; }
.form-group label {
  display: block;
  font-size: 0.75rem;
  font-weight: 550;
  margin-bottom: 6px;
  color: var(--muted);
  letter-spacing: 0.3px;
}
.form-group input,
.otp-input {
  width: 100%;
  padding: 12px 13px;
  background: var(--field);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  font-size: 0.95rem;
  font-family: inherit;
}
.form-group input:focus,
.otp-input:focus {
  outline: none;
  border-color: rgba(232, 197, 71, 0.45);
  box-shadow: 0 0 0 3px var(--gold-dim);
}

.cta-button {
  display: block;
  width: 100%;
  margin-top: 6px;
  padding: 12px;
  background: var(--gold);
  color: #16140b;
  border: none;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.92rem;
  font-family: inherit;
  cursor: pointer;
}
.cta-button:hover { filter: brightness(1.05); }

.error { color: var(--danger); font-size: 0.82rem; margin-top: 10px; min-height: 1em; }
.success { color: var(--gold); font-size: 0.82rem; margin-top: 10px; }
.toggle-link { margin-top: 14px; font-size: 0.82rem; color: var(--muted); }
.toggle-link a { color: var(--text); text-decoration: none; font-weight: 550; }
.toggle-link a:hover { color: var(--gold); }

footer {
  padding: 16px;
  text-align: center;
  color: var(--muted);
  font-size: 0.75rem;
  border-top: 1px solid var(--border);
}

@media (max-width: 860px) {
  .auth-layout { grid-template-columns: 1fr; max-width: 420px; gap: 22px; }
  .multi-api-panel { order: -1; }
  .multi-api-panel img { max-height: 220px; object-fit: contain; margin: 0 auto; }
  .multi-api-caption { text-align: center; }
}
@media (max-width: 640px) {
  header { padding: 12px 16px; }
  .logo img { height: 38px; }
  .auth-container { padding: 20px 16px 32px; }
  .auth-box { padding: 24px 18px; }
}