:root {
  --usa-blue: #0a3161;
  --usa-blue-dark: #061f40;
  --usa-red: #b31942;
  --usa-red-bright: #d81e3c;
  --white: #ffffff;
  --off-white: #f5f7fa;
  --text-muted: #c7d2e0;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: 'Poppins', sans-serif;
  background: var(--usa-blue);
  color: var(--white);
  line-height: 1.6;
}

.container {
  max-width: 600px;
  margin: 0 auto;
  padding: 0 24px;
}

h1 {
  font-weight: 800;
  margin: 0 0 16px;
}

a {
  color: inherit;
}

/* Buttons */
.btn {
  display: inline-block;
  font-family: 'Poppins', sans-serif;
  font-weight: 600;
  font-size: 15px;
  text-decoration: none;
  padding: 12px 28px;
  border-radius: 999px;
  border: none;
  cursor: pointer;
  transition: transform 0.15s ease, background-color 0.15s ease;
}

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

.btn-primary {
  background: var(--usa-red-bright);
  color: var(--white);
}

.btn-primary:hover {
  background: var(--usa-red);
}

.btn-full {
  width: 100%;
  text-align: center;
}

/* Hero */
.hero {
  flex: 1;
  display: flex;
  align-items: center;
  padding: 60px 0;
  background: radial-gradient(circle at top right, rgba(211, 30, 60, 0.18), transparent 55%),
              var(--usa-blue);
  text-align: center;
}

.hero-inner {
  width: 100%;
}

.hero h1 {
  font-size: clamp(38px, 8vw, 60px);
  line-height: 1.1;
  color: var(--white);
}

.hero-sub {
  margin: 0 0 32px;
  font-size: 18px;
  color: var(--text-muted);
}

/* Sign-up form */
.signup-form {
  max-width: 400px;
  margin: 0 auto;
  background: var(--white);
  color: var(--usa-blue-dark);
  border-radius: 16px;
  padding: 32px;
  text-align: left;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.25);
  border-top: 6px solid var(--usa-red-bright);
}

.hidden-field {
  position: absolute;
  left: -9999px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
}

.form-row {
  margin-bottom: 14px;
}

.form-row input {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid #d5dae2;
  border-radius: 8px;
  font-family: 'Poppins', sans-serif;
  font-size: 15px;
  background: var(--off-white);
  color: var(--usa-blue-dark);
}

.form-row input:focus {
  outline: none;
  border-color: var(--usa-red-bright);
  background: var(--white);
}

.form-consent {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin-bottom: 18px;
}

.form-consent input {
  width: auto;
  margin-top: 3px;
  accent-color: var(--usa-red-bright);
}

.form-consent label {
  font-size: 12px;
  color: #5a6678;
  line-height: 1.4;
}

.form-error {
  margin: 12px 0 0;
  font-size: 13px;
  color: var(--usa-red);
  text-align: center;
}

/* Footer */
.site-footer {
  padding: 20px 0;
  text-align: center;
  font-size: 13px;
  color: var(--text-muted);
}

/* Responsive */
@media (max-width: 480px) {
  .signup-form {
    padding: 24px 20px;
  }
}