*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --primary: #1a4d7c;
  --primary-dark: #123a5e;
  --accent: #2d8a6e;
  --bg: #f4f7fa;
  --surface: #ffffff;
  --border: #d8e0ea;
  --text: #1e293b;
  --muted: #64748b;
  --error: #dc2626;
  --radius: 8px;
  --shadow: 0 2px 12px rgba(26, 77, 124, 0.08);
}

body {
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* Header */
.site-header {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: #fff;
  padding: 1.5rem 0;
}

.header-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  align-items: flex-end;
}

.brand h1 {
  font-size: 1.35rem;
  font-weight: 700;
}

.tagline {
  font-size: 0.9rem;
  opacity: 0.9;
  margin-top: 0.25rem;
}

.contact {
  font-size: 0.8rem;
  opacity: 0.85;
  text-align: right;
}

/* Main */
main {
  padding: 2rem 1.25rem 3rem;
}

.form-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow);
  max-width: 560px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.notice {
  background: #fff8e6;
  border-left: 4px solid #f59e0b;
  padding: 0.75rem 1rem;
  margin-bottom: 1.5rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 0.95rem;
}

.req {
  color: var(--error);
}

.hint {
  font-weight: 400;
  color: var(--muted);
  font-size: 0.85rem;
}

/* Sections */
.form-section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.25rem;
  box-shadow: var(--shadow);
}

.form-section h2 {
  font-size: 1.1rem;
  color: var(--primary);
  border-bottom: 2px solid var(--accent);
  padding-bottom: 0.5rem;
  margin-bottom: 1.25rem;
}

.form-section h3 {
  font-size: 1rem;
  color: var(--primary);
  margin-bottom: 1rem;
}

.info-text {
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 1rem;
  line-height: 1.6;
}

/* Grid */
.grid {
  display: grid;
  gap: 1rem;
  margin-bottom: 1rem;
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 768px) {
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .contact {
    text-align: left;
  }
}

/* Fields */
.field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.field label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text);
}

.field input[type="text"],
.field input[type="email"],
.field input[type="tel"],
.field input[type="date"],
.field input[type="number"],
.field select,
.field textarea {
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-family: inherit;
  transition: border-color 0.15s, box-shadow 0.15s;
  background: #fff;
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(26, 77, 124, 0.15);
}

.field input.invalid,
.field select.invalid {
  border-color: var(--error);
}

.field small {
  font-size: 0.78rem;
  color: var(--muted);
}

.field small a {
  color: var(--primary);
}

.mt-sm {
  margin-top: 0.5rem;
}

/* Radio & Checkbox */
.radio-group,
.checkbox-grid {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.radio-group.inline,
.checkbox-grid {
  flex-direction: row;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
}

.checkbox-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 0.5rem;
}

.radio-group label,
.checkbox-grid label,
.checkbox-field label {
  font-weight: 400;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  cursor: pointer;
  font-size: 0.9rem;
}

.checkbox-field {
  margin-bottom: 0.5rem;
}

.checkbox-field label {
  font-weight: 400;
}

/* Under 18 */
.under-18 {
  margin-top: 1.25rem;
  padding-top: 1.25rem;
  border-top: 1px dashed var(--border);
}

/* Buttons */
.form-actions {
  display: flex;
  gap: 1rem;
  justify-content: flex-end;
  flex-wrap: wrap;
  margin-top: 1.5rem;
}

.btn {
  padding: 0.7rem 1.5rem;
  border: none;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: #247a61;
}

.btn-secondary {
  background: #e2e8f0;
  color: var(--text);
}

.btn-secondary:hover {
  background: #cbd5e1;
}

/* Popup */
.popup-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  z-index: 1000;
  animation: fadeIn 0.2s ease;
}

.popup-overlay[hidden] {
  display: none;
}

.popup-box {
  background: var(--surface);
  border-radius: 12px;
  padding: 2rem 1.75rem;
  max-width: 380px;
  width: 100%;
  text-align: center;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.2);
  animation: slideUp 0.25s ease;
}

.popup-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 1rem;
  background: #dcfce7;
  color: var(--accent);
  font-size: 1.75rem;
  font-weight: 700;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.popup-box h2 {
  color: var(--accent);
  font-size: 1.35rem;
  margin-bottom: 0.5rem;
}

.popup-box p {
  color: var(--muted);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
}

.popup-box .btn {
  width: 100%;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(16px) scale(0.97);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* Footer */
.site-footer {
  background: var(--primary-dark);
  color: rgba(255, 255, 255, 0.8);
  padding: 1.25rem 0;
  font-size: 0.8rem;
  text-align: center;
}

.site-footer p + p {
  margin-top: 0.25rem;
}