:root {
  --sdn-bg: #f5f7fb;
  --sdn-panel: #ffffff;
  --sdn-text: #101828;
  --sdn-muted: #667085;
  --sdn-line: #d9e2ec;
  --sdn-primary: #1aa4b8;
  --sdn-primary-dark: #13879a;
  --sdn-accent: #ff6700;
  --sdn-shadow: 0 24px 70px rgba(15, 23, 42, 0.12);
}

* {
  box-sizing: border-box;
}

body.sdn-body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--sdn-text);
  background:
    radial-gradient(circle at 18% 18%, rgba(26, 164, 184, 0.18), transparent 28%),
    radial-gradient(circle at 86% 12%, rgba(255, 103, 0, 0.12), transparent 24%),
    var(--sdn-bg);
}

.sdn-field {
  display: grid;
  gap: 8px;
  margin: 0 0 18px;
}

.sdn-field label {
  color: #344054;
  font-size: 13px;
  font-weight: 700;
}

.sdn-field input {
  width: 100%;
  min-height: 52px;
  border: 1px solid var(--sdn-line);
  border-radius: 12px;
  padding: 0 15px;
  color: var(--sdn-text);
  font-size: 16px;
  outline: none;
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.sdn-field input:focus {
  border-color: var(--sdn-primary);
  box-shadow: 0 0 0 4px rgba(26, 164, 184, 0.12);
}

.sdn-btn {
  min-height: 54px;
  border: 0;
  border-radius: 12px;
  background: var(--sdn-primary);
  box-shadow: 0 16px 34px rgba(26, 164, 184, 0.22);
  color: #fff;
  cursor: pointer;
  font-size: 15px;
  font-weight: 800;
  transition: transform 0.18s ease, background 0.18s ease, box-shadow 0.18s ease;
}

.sdn-btn:hover {
  background: var(--sdn-primary-dark);
  transform: translateY(-1px);
}

.sdn-alert {
  margin: 0 0 18px;
  padding: 13px 14px;
  border: 1px solid rgba(255, 103, 0, 0.22);
  border-radius: 12px;
  background: rgba(255, 103, 0, 0.08);
  color: #9a3d00;
  font-size: 14px;
  line-height: 1.4;
}

.sdn-alert.is-success {
  border-color: rgba(18, 183, 106, 0.24);
  background: rgba(18, 183, 106, 0.08);
  color: #067647;
}