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

:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --bg: #f8fafc;
  --surface: #ffffff;
  --text: #1e293b;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --success: #16a34a;
  --error: #dc2626;
  --badge-bg: #dbeafe;
  --badge-text: #1e40af;
  --radius: 12px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  padding-bottom: 80px;
}

/* Header */
.header {
  background: linear-gradient(135deg, #1e3a8a, #2563eb);
  color: #fff;
  padding: 60px 20px;
  text-align: center;
}

.header__logo {
  font-size: 1.2rem;
  font-weight: 700;
  opacity: 0.8;
  margin-bottom: 16px;
}

.header__title {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.header__subtitle {
  font-size: 1.1rem;
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto;
}

/* Main */
.main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 20px;
}

/* Catalog sections */
.catalog {
  margin-bottom: 48px;
}

.catalog__title {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.catalog__subtitle {
  color: var(--text-muted);
  margin-bottom: 24px;
}

/* Category groups */
.category-group {
  margin-bottom: 32px;
}

.category-group__title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--border);
}

/* Card grid */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

/* Card */
.card {
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  cursor: pointer;
  transition: border-color 0.2s, box-shadow 0.2s;
  position: relative;
}

.card:hover {
  border-color: var(--primary);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.1);
}

.card--selected {
  border-color: var(--primary);
  background: #f0f7ff;
}

.card__header {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 8px;
}

.card__checkbox {
  width: 20px;
  height: 20px;
  accent-color: var(--primary);
  flex-shrink: 0;
  margin-top: 2px;
}

.card__name {
  font-size: 1rem;
  font-weight: 600;
  flex: 1;
}

.card__badge {
  background: var(--badge-bg);
  color: var(--badge-text);
  font-size: 0.7rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 99px;
  white-space: nowrap;
}

.card__description {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-left: 32px;
}

.card__details {
  margin-left: 32px;
  margin-top: 8px;
}

.card__toggle {
  font-size: 0.85rem;
  color: var(--primary);
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.card__full-description {
  margin-top: 8px;
  font-size: 0.85rem;
  color: var(--text);
}

.card__examples {
  margin-top: 8px;
  font-size: 0.8rem;
  color: var(--text-muted);
  font-style: italic;
}

.card__hint {
  margin-left: 32px;
  margin-top: 8px;
  font-size: 0.8rem;
  color: var(--primary);
}

/* Bottom bar */
.bottom-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 16px 20px;
  box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.05);
  z-index: 100;
}

.bottom-bar__inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.bottom-bar__count {
  font-size: 1rem;
  font-weight: 500;
}

/* Buttons */
.btn {
  padding: 12px 24px;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, opacity 0.2s;
}

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

.btn--primary:hover:not(:disabled) {
  background: var(--primary-hover);
}

.btn--primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn--full {
  width: 100%;
}

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  padding: 20px;
}

.modal {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 32px;
  width: 100%;
  max-width: 500px;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
}

.modal__close {
  position: absolute;
  top: 16px;
  right: 16px;
  font-size: 1.5rem;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
}

.modal__title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 24px;
}

.modal__success {
  text-align: center;
  padding: 40px 0;
  font-size: 1.1rem;
  color: var(--success);
  font-weight: 500;
}

/* Form */
.form__group {
  margin-bottom: 16px;
}

.form__label {
  display: block;
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 4px;
}

.form__input {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  transition: border-color 0.2s;
}

.form__input:focus {
  outline: none;
  border-color: var(--primary);
}

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

.form__textarea {
  resize: vertical;
  min-height: 80px;
}

.form__error {
  display: block;
  font-size: 0.8rem;
  color: var(--error);
  margin-top: 4px;
  min-height: 1em;
}

/* Responsive */
@media (max-width: 1199px) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .header__title {
    font-size: 2rem;
  }
}

@media (max-width: 767px) {
  .card-grid {
    grid-template-columns: 1fr;
  }
  .header {
    padding: 40px 16px;
  }
  .header__title {
    font-size: 1.6rem;
  }
  .bottom-bar__inner {
    flex-direction: column;
    gap: 12px;
  }
  .modal {
    padding: 24px;
  }
}