:root {
  --green-dark: #2d5016;
  --green-mid: #4a7c29;
  --green-light: #7cb342;
  --green-pale: #e8f5e9;
  --earth-brown: #5d4037;
  --earth-light: #8d6e63;
  --warm-accent: #ff8f00;
  --warm-accent-dark: #e65100;
  --cream: #faf8f5;
  --text-primary: #1b1b1b;
  --text-secondary: #4a4a4a;
  --focus-ring: #1565c0;
  --error: #c62828;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text-primary);
  background-color: var(--cream);
  margin: 0;
  padding: 0;
  line-height: 1.6;
}

/* Skip link */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  background: var(--focus-ring);
  color: #fff;
  padding: 0.5rem 1rem;
  border-radius: 0 0 4px 4px;
  z-index: 100;
  text-decoration: none;
  font-weight: 600;
}

.skip-link:focus {
  top: 0;
}

/* Focus styles */
:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 2px;
}

/* Header */
.site-header {
  background: linear-gradient(135deg, var(--green-dark), var(--green-mid));
  color: #fff;
  text-align: center;
  padding: 3rem 1rem;
}

.site-header h1 {
  font-size: 2.5rem;
  margin: 0 0 0.25rem;
  letter-spacing: 0.02em;
}

.site-header .subtitle {
  font-size: 1.15rem;
  opacity: 0.9;
  margin: 0;
}

.leaf {
  display: inline-block;
}

@media (prefers-reduced-motion: no-preference) {
  .leaf {
    animation: sway 3s ease-in-out infinite;
  }

  @keyframes sway {
    0%, 100% { transform: rotate(0deg); }
    50% { transform: rotate(8deg); }
  }
}

/* Main content */
.container {
  max-width: 40rem;
  margin: 0 auto;
  padding: 2rem 1rem;
}

/* Details section */
.party-details {
  background: #fff;
  border-radius: 8px;
  padding: 1.5rem 2rem;
  margin-bottom: 2rem;
  border-left: 4px solid var(--green-light);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.party-details h2 {
  color: var(--green-dark);
  margin-top: 0;
  font-size: 1.5rem;
}

.detail-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.detail-list li {
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--green-pale);
}

.detail-list li:last-child {
  border-bottom: none;
}

.detail-label {
  font-weight: 600;
  color: var(--earth-brown);
}

/* Form section */
.rsvp-section h2 {
  color: var(--green-dark);
  font-size: 1.5rem;
}

.rsvp-form {
  background: #fff;
  border-radius: 8px;
  padding: 1.5rem 2rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
}

.form-group input[type="text"],
.form-group input[type="tel"],
.form-group input[type="number"] {
  width: 100%;
  padding: 0.6rem 0.75rem;
  font-size: 1rem;
  border: 2px solid #ccc;
  border-radius: 6px;
  background: #fff;
  color: var(--text-primary);
  transition: border-color 0.15s;
}

.form-group input[type="text"]:focus,
.form-group input[type="tel"]:focus,
.form-group input[type="number"]:focus {
  border-color: var(--green-mid);
  outline: none;
  box-shadow: 0 0 0 3px rgba(74, 124, 41, 0.2);
}

.form-group input[type="number"] {
  max-width: 8rem;
}

/* Radio group */
.rsvp-options {
  border: none;
  padding: 0;
  margin: 0 0 1.25rem;
}

.rsvp-options legend {
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  font-size: 1rem;
}

.radio-group {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.radio-option {
  position: relative;
}

.radio-option input[type="radio"] {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.radio-option label {
  display: inline-block;
  padding: 0.5rem 1.25rem;
  border: 2px solid #ccc;
  border-radius: 2rem;
  cursor: pointer;
  font-weight: 500;
  color: var(--text-secondary);
  transition: border-color 0.15s, background-color 0.15s, color 0.15s;
  user-select: none;
}

.radio-option input[type="radio"]:focus-visible + label {
  outline: 3px solid var(--focus-ring);
  outline-offset: 2px;
}

.radio-option input[type="radio"]:checked + label {
  background-color: var(--green-mid);
  border-color: var(--green-mid);
  color: #fff;
}

.radio-option label:hover {
  border-color: var(--green-light);
}

/* Submit button */
.submit-btn {
  display: inline-block;
  background: var(--warm-accent);
  color: #fff;
  font-size: 1.1rem;
  font-weight: 700;
  padding: 0.75rem 2rem;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: background-color 0.15s;
}

.submit-btn:hover {
  background: var(--warm-accent-dark);
}

.submit-btn:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 2px;
}

/* Form status messages */
.form-status {
  margin-top: 1rem;
  font-weight: 600;
  min-height: 1.5em;
}

.form-status--success {
  color: var(--green-dark);
}

.form-status--error {
  color: var(--error);
}

.submit-btn:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

/* Footer */
.site-footer {
  text-align: center;
  padding: 2rem 1rem;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 480px) {
  .site-header h1 {
    font-size: 1.75rem;
  }

  .party-details,
  .rsvp-form {
    padding: 1.25rem;
  }

  .radio-group {
    flex-direction: column;
  }

  .radio-option label {
    display: block;
    text-align: center;
  }
}