/* ============================================================
   Newsletter signup styles
   FR-6: responsive on mobile, tablet, and desktop viewports.
   FR-7: no navigation links or extra content in the layout.
   ============================================================ */

:root {
  --color-bg-top: #eef2ff;
  --color-bg-bottom: #f4f6fb;
  --color-card: #ffffff;
  --color-text: #1f2937;
  --color-muted: #6b7280;
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-border: #cbd5e1;
  --color-error: #b91c1c;
  --color-success: #15803d;
  --color-duplicate: #b45309;
  --color-error-bg: #fee2e2;
  --color-error-border: #fecaca;
  --color-success-bg: #dcfce7;
  --color-success-border: #bbf7d0;
  --color-duplicate-bg: #fef3c7;
  --color-duplicate-border: #fde68a;
  --shadow: 0 10px 30px rgba(31, 41, 55, 0.1);
  --radius: 12px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Helvetica, Arial, sans-serif;
  color: var(--color-text);
  background: linear-gradient(
    135deg,
    var(--color-bg-top) 0%,
    var(--color-bg-bottom) 100%
  );
  -webkit-font-smoothing: antialiased;
}

/* Center the card and constrain its width (FR-6) */
.signup {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.signup__card {
  width: 100%;
  max-width: 520px;
  background: var(--color-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 40px 32px;
  text-align: center;
}

/* FR-1: headline */
.signup__headline {
  margin: 0 0 12px;
  font-size: 2rem;
  line-height: 1.2;
  font-weight: 700;
}

/* FR-1: short descriptive paragraph */
.signup__lede {
  margin: 0 0 28px;
  color: var(--color-muted);
  font-size: 1.05rem;
  line-height: 1.6;
}

/* Shared status message styles */
.signup__message {
  display: none;
  margin: 0 0 16px;
  padding: 12px 16px;
  border-radius: 8px;
  font-size: 0.95rem;
  line-height: 1.4;
  text-align: left;
}

.signup__message[hidden] {
  display: none;
}

.signup__message:not([hidden]) {
  display: block;
}

/* FR-4: inline error message */
.signup__message--error {
  background: var(--color-error-bg);
  color: var(--color-error);
  border: 1px solid var(--color-error-border);
}

/* FR-3: confirmation message */
.signup__message--success {
  background: var(--color-success-bg);
  color: var(--color-success);
  border: 1px solid var(--color-success-border);
}

/* FR-5: duplicate subscription message */
.signup__message--duplicate {
  background: var(--color-duplicate-bg);
  color: var(--color-duplicate);
  border: 1px solid var(--color-duplicate-border);
}

/* FR-1: the form */
.signup__form {
  display: block;
  margin: 0 0 18px;
  text-align: left;
}

.signup__label {
  display: block;
  margin-bottom: 8px;
  font-size: 0.9rem;
  font-weight: 600;
}

.signup__row {
  display: flex;
  gap: 10px;
}

.signup__input {
  flex: 1;
  min-width: 0;
  padding: 13px 14px;
  font-size: 1rem;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  color: var(--color-text);
  background: #ffffff;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.signup__input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.signup__input--invalid {
  border-color: var(--color-error);
}

.signup__button {
  flex-shrink: 0;
  padding: 13px 20px;
  font-size: 1rem;
  font-weight: 600;
  color: #ffffff;
  background: var(--color-primary);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.15s;
}

.signup__button:hover {
  background: var(--color-primary-dark);
}

.signup__button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* FR-7: minimal footer note inside the signup area only */
.signup__note {
  margin: 0;
  font-size: 0.85rem;
  color: var(--color-muted);
}

/* ============================================================
   FR-6: responsive behavior
   ============================================================ */
@media (max-width: 600px) {
  .signup__card {
    padding: 28px 20px;
  }

  .signup__headline {
    font-size: 1.6rem;
  }

  /* Stack the email field and button on narrow screens */
  .signup__row {
    flex-direction: column;
  }

  .signup__button {
    width: 100%;
  }
}