/* =============================================================================
 * File: frontend/public/css/TutorialsPage.css
 * Styles for Tutorials Page — D4S Light Theme
 *
 * Follows ConfigurationGuides.css pattern. All structural colors use D4S tokens
 * for white-label readiness. Prefix: tut-
 * ============================================================================= */

/* Container */
.tut-container {
  padding: var(--space-6);
  max-width: 800px;
  margin: 0 auto;
}

/* Header */
.tut-header {
  margin-bottom: var(--space-6);
}

.tut-title {
  color: var(--brand-primary-dark);
  font-family: var(--font-heading);
  font-size: 28px;
  font-weight: 700;
  margin: 0 0 var(--space-2) 0;
}

.tut-subtitle {
  color: var(--brand-text-muted);
  font-size: 14px;
  margin: 0;
}

/* Search Bar */
.tut-search-wrapper {
  position: relative;
  margin-bottom: var(--space-5);
}

.tut-search-icon {
  position: absolute;
  left: var(--space-4);
  top: 50%;
  transform: translateY(-50%);
  color: var(--brand-text-muted);
  font-size: 16px;
  pointer-events: none;
}

.tut-search-input {
  width: 100%;
  padding: var(--space-3) var(--space-4) var(--space-3) 44px;
  border: 1px solid var(--brand-border);
  border-radius: var(--radius-md);
  font-size: 14px;
  color: var(--brand-text);
  background-color: var(--brand-surface);
  outline: none;
  transition: border-color var(--transition);
  box-sizing: border-box;
}

.tut-search-input:focus {
  border-color: var(--brand-primary);
}

.tut-search-input::placeholder {
  color: var(--brand-text-muted);
}

.tut-search-clear {
  position: absolute;
  right: var(--space-3);
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--brand-text-muted);
  font-size: 18px;
  cursor: pointer;
  padding: var(--space-1);
  line-height: 1;
}

.tut-search-clear:hover {
  color: var(--brand-text);
}

/* Category Tabs — D4S underline style */
.tut-tabs {
  display: flex;
  gap: var(--space-1);
  margin-bottom: var(--space-5);
  border-bottom: 2px solid var(--brand-border);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.tut-tabs::-webkit-scrollbar {
  display: none;
}

.tut-tab {
  padding: var(--space-2) var(--space-4);
  background-color: transparent;
  color: var(--brand-text-muted);
  border: none;
  border-bottom: 2px solid transparent;
  border-radius: 0;
  font-size: 13px;
  cursor: pointer;
  margin-bottom: -2px;
  transition: all var(--transition);
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.tut-tab:hover {
  color: var(--brand-primary);
}

.tut-tab.active {
  color: var(--brand-primary);
  border-bottom-color: var(--brand-primary);
  font-weight: 600;
}

.tut-tab-count {
  font-size: 11px;
  color: var(--brand-text-muted);
  font-weight: 400;
}

.tut-tab.active .tut-tab-count {
  color: var(--brand-primary);
}

/* Result count */
.tut-result-count {
  color: var(--brand-text-muted);
  font-size: 13px;
  margin-bottom: var(--space-4);
}

/* Accordion Sections */
.tut-section {
  background-color: var(--brand-surface);
  border-radius: 12px;
  margin-bottom: var(--space-4);
  overflow: hidden;
  border: 1px solid var(--brand-border);
}

.tut-section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-5);
  cursor: pointer;
  background-color: var(--brand-surface);
  transition: background-color 0.2s;
  user-select: none;
}

.tut-section-header:hover,
.tut-section-header.active {
  background-color: var(--brand-surface-elevated);
}

.tut-section-left {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex: 1;
  min-width: 0;
}

.tut-section-icon {
  font-size: 24px;
  flex-shrink: 0;
}

.tut-section-title {
  color: var(--brand-primary-dark);
  font-size: 16px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.tut-section-meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}

.tut-section-time {
  color: var(--brand-text-muted);
  font-size: 12px;
  white-space: nowrap;
}

.tut-section-check {
  color: var(--color-success);
  font-size: 16px;
}

.tut-section-chevron {
  color: var(--brand-text-muted);
  font-size: 20px;
  transition: transform 0.2s;
}

.tut-section-chevron.expanded {
  transform: rotate(180deg);
}

/* Accordion Content */
.tut-section-content {
  padding: 0 var(--space-5) var(--space-5) var(--space-5);
  border-top: 1px solid var(--brand-border);
}

.tut-description {
  color: var(--brand-text);
  font-size: 14px;
  line-height: 1.7;
  margin: var(--space-4) 0;
}

/* Prerequisites */
.tut-prerequisites {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
  flex-wrap: wrap;
}

.tut-prerequisites-label {
  color: var(--brand-text-muted);
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.tut-prerequisite-link {
  background-color: var(--brand-surface-elevated);
  color: var(--brand-primary);
  border: none;
  padding: var(--space-1) var(--space-3);
  border-radius: 12px;
  font-size: 12px;
  cursor: pointer;
  transition: background-color var(--transition);
}

.tut-prerequisite-link:hover {
  background-color: var(--brand-border);
}

/* Step List */
.tut-step-list {
  list-style: none;
  padding: 0;
  margin: var(--space-4) 0;
}

.tut-step {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--brand-border);
}

.tut-step:last-child {
  border-bottom: none;
}

.tut-step-number {
  background-color: var(--brand-secondary);
  color: var(--brand-primary);
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 700;
  flex-shrink: 0;
}

.tut-step-content {
  flex: 1;
  min-width: 0;
}

.tut-step-title {
  color: var(--brand-primary-dark);
  font-size: 14px;
  font-weight: 600;
  margin-bottom: var(--space-1);
}

.tut-step-description {
  color: var(--brand-text);
  font-size: 14px;
  line-height: 1.6;
}

/* Tip / Warning callout boxes */
.tut-tip-box {
  background: linear-gradient(135deg, var(--brand-primary-dark) 0%, var(--brand-primary) 100%);
  border-radius: 8px;
  padding: var(--space-3) var(--space-4);
  margin-top: var(--space-3);
  border-left: 4px solid var(--brand-secondary);
}

.tut-tip-label {
  color: var(--brand-secondary);
  font-size: 12px;
  font-weight: 600;
  margin-bottom: var(--space-1);
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.tut-tip-text {
  color: rgba(255, 255, 255, 0.9);
  font-size: 13px;
  line-height: 1.5;
  margin: 0;
}

.tut-warning-box {
  background-color: var(--color-error-light);
  border-radius: 8px;
  padding: var(--space-3) var(--space-4);
  margin-top: var(--space-3);
  border-left: 4px solid var(--color-error);
}

.tut-warning-label {
  color: var(--color-error);
  font-size: 12px;
  font-weight: 600;
  margin-bottom: var(--space-1);
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.tut-warning-text {
  color: var(--brand-text);
  font-size: 13px;
  line-height: 1.5;
  margin: 0;
}

/* Notes */
.tut-notes {
  margin-top: var(--space-4);
}

.tut-note-info {
  background: linear-gradient(135deg, var(--brand-primary-dark) 0%, var(--brand-primary) 100%);
  border-radius: 8px;
  padding: var(--space-3) var(--space-4);
  border-left: 4px solid var(--brand-secondary);
  margin-bottom: var(--space-3);
}

.tut-note-info-label {
  color: var(--brand-secondary);
  font-size: 12px;
  font-weight: 600;
  margin-bottom: var(--space-1);
}

.tut-note-info-text {
  color: rgba(255, 255, 255, 0.9);
  font-size: 13px;
  line-height: 1.5;
  margin: 0;
}

/* Related Tutorials */
.tut-related {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-4);
  flex-wrap: wrap;
}

.tut-related-label {
  color: var(--brand-text-muted);
  font-size: 12px;
  font-weight: 600;
}

.tut-related-link {
  background-color: var(--brand-surface-elevated);
  color: var(--brand-primary);
  border: none;
  padding: var(--space-1) var(--space-3);
  border-radius: 12px;
  font-size: 12px;
  cursor: pointer;
  transition: background-color var(--transition);
}

.tut-related-link:hover {
  background-color: var(--brand-border);
}

/* Complete Button */
.tut-complete-wrapper {
  display: flex;
  justify-content: center;
  margin-top: var(--space-5);
}

.tut-complete-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  background: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-primary-dark) 100%);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: opacity var(--transition);
}

.tut-complete-btn:hover {
  opacity: 0.9;
}

.tut-complete-btn.completed {
  background: linear-gradient(135deg, var(--brand-secondary) 0%, var(--brand-secondary-dark, #B89952) 100%);
  color: var(--brand-primary-dark);
}

/* Empty State */
.tut-empty {
  text-align: center;
  padding: var(--space-8) var(--space-4);
  color: var(--brand-text-muted);
}

.tut-empty-icon {
  font-size: 48px;
  margin-bottom: var(--space-4);
}

.tut-empty-text {
  font-size: 16px;
  margin: 0;
}

/* ======================== RESPONSIVE ======================== */

@media (max-width: 768px) {
  .tut-container {
    padding: var(--space-4);
  }

  .tut-title {
    font-size: 22px;
  }

  .tut-section-header {
    padding: var(--space-3) var(--space-4);
  }

  .tut-section-content {
    padding: 0 var(--space-4) var(--space-4) var(--space-4);
  }

  .tut-section-title {
    font-size: 14px;
  }

  .tut-section-time {
    font-size: 11px;
  }

  .tut-tab {
    padding: var(--space-2) var(--space-3);
    font-size: 12px;
  }
}

@media (max-width: 480px) {
  .tut-container {
    padding: var(--space-3);
  }

  .tut-section-left {
    gap: var(--space-2);
  }

  .tut-section-icon {
    font-size: 20px;
  }

  .tut-step {
    gap: var(--space-2);
  }

  .tut-step-number {
    width: 24px;
    height: 24px;
    font-size: 12px;
  }
}