:root {
  --page-bg: #f5f6f8;
  --card-bg: #ffffff;
  --accent: #4f46e5;
  --accent-hover: #4338ca;
  --text: #1f2937;
  --text-muted: #6b7280;
  --border: #e5e7eb;
  --danger: #dc2626;
  --shadow: 0 1px 3px rgba(16, 24, 40, 0.06), 0 1px 2px rgba(16, 24, 40, 0.05);
  --shadow-hover: 0 6px 16px rgba(16, 24, 40, 0.08), 0 2px 6px rgba(16, 24, 40, 0.06);
  --radius-card: 18px;
  --radius-nav: 30px;
  --container-width: 1100px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--page-bg);
  color: var(--text);
  line-height: 1.6;
  padding-top: 104px;
}

img {
  max-width: 100%;
}

a {
  color: inherit;
}

.container {
  max-width: var(--container-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

.card {
  background-color: var(--card-bg);
  border-radius: var(--radius-card);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  border-radius: 10px;
  border: 1px solid transparent;
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.4;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.btn:hover {
  transform: translateY(-2px);
}

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

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

.btn-primary:hover {
  background-color: var(--accent-hover);
  border-color: var(--accent-hover);
}

.btn-secondary {
  background-color: var(--card-bg);
  border-color: var(--border);
  color: var(--accent);
}

.btn-secondary:hover {
  border-color: var(--accent);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.85rem;
}

.fade-in {
  animation: fadeIn 0.3s ease both;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 8px;
  margin-bottom: 16px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s ease;
}

.back-link:hover {
  color: var(--accent);
}

.back-link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 6px;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 768px) {
  body {
    padding-top: 78px;
  }

  .container {
    padding-left: 16px;
    padding-right: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}