/* ============================================================
   pages/brief.css — Multi-Step Brief Form
   tgport.ru Design System
   ============================================================ */

/* --- Progress Bar --- */

.brief-progress {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

.brief-progress__bar {
  flex: 1;
  height: 4px;
  background: var(--color-bg-sunken);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.brief-progress__fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-accent), var(--color-secondary));
  border-radius: var(--radius-full);
  transition: width var(--transition-slow);
}

.brief-progress__text {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-muted);
  white-space: nowrap;
}

/* --- Step Dots Indicator --- */

.brief-steps-indicator {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  margin-bottom: var(--space-2xl);
}

.brief-steps-indicator__dot {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-xs);
  font-weight: 600;
  border-radius: 50%;
  border: 2px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text-muted);
  cursor: default;
  transition:
    background var(--transition-base),
    border-color var(--transition-base),
    color var(--transition-base),
    transform var(--transition-fast);
}

.brief-steps-indicator__dot--active {
  border-color: var(--color-accent);
  background: var(--color-accent);
  color: #fff;
  transform: scale(1.1);
}

.brief-steps-indicator__dot--completed {
  border-color: var(--color-success);
  background: var(--color-success);
  color: #fff;
}

/* --- Brief Form Container --- */

.brief-form {
  position: relative;
}

/* --- Steps --- */

.brief-step {
  display: none;
  animation: brief-fade-in 350ms ease;
}

.brief-step--active {
  display: block;
}

@keyframes brief-fade-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.brief-step__title {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-heading);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-sm);
  border-bottom: var(--border-w) solid var(--color-border);
}

/* --- Form Options (checkbox / radio groups) --- */

.form-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.form-options--radio {
  gap: var(--space-sm);
}

.form-option {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md);
  border: var(--border-w) solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition:
    border-color var(--transition-fast),
    background var(--transition-fast);
}

.form-option:hover {
  border-color: var(--color-border-hover);
  background: var(--color-surface-hover);
}

.form-option:has(input:checked) {
  border-color: var(--color-accent);
  background: var(--color-accent-subtle);
}

.form-option input[type="checkbox"],
.form-option input[type="radio"] {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  accent-color: var(--color-accent);
  cursor: pointer;
}

.form-option span {
  font-size: var(--text-sm);
  font-weight: 500;
  cursor: pointer;
  user-select: none;
}

/* --- Navigation Buttons --- */

.brief-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-md);
  margin-top: var(--space-2xl);
  padding-top: var(--space-xl);
  border-top: var(--border-w) solid var(--color-border);
}

.brief-nav__submit {
  min-width: 200px;
}

/* --- Responsive --- */

@media (min-width: 768px) {
  .form-options:not(.form-options--radio) {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 767px) {
  .brief-steps-indicator__dot {
    width: 28px;
    height: 28px;
    font-size: 0.65rem;
  }

  .brief-steps-indicator {
    gap: var(--space-2xs);
  }

  .brief-nav {
    flex-wrap: wrap;
  }

  .brief-nav .btn {
    flex: 1;
    min-width: 120px;
    justify-content: center;
  }

  .brief-nav__submit {
    width: 100%;
    order: -1;
  }
}