/* ==========================================================================
   nessvyuh - Components Stylesheet
   Question Card, Options, Solution Box, Animated Step Solver, Modals
   ========================================================================== */

/* Question Card */
.question-card {
  background: var(--surface-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.6rem;
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  position: relative;
  scroll-margin-top: 140px;
}

.question-card:hover {
  border-color: var(--border-medium);
  box-shadow: var(--shadow-md);
}

.question-card.active-target {
  border-color: var(--accent-terracotta);
  box-shadow: 0 0 0 2px var(--accent-terracotta-soft), var(--shadow-md);
}

/* Card Header */
.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 1.1rem;
  flex-wrap: wrap;
}

.card-header-left {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.q-number-pill {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: baseline;
  gap: 0.2rem;
}

.badge-tag {
  font-size: 0.7rem;
  font-weight: 500;
  font-family: var(--font-mono);
  padding: 0.15rem 0.55rem;
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}

.badge-tag.topic {
  background: var(--surface-muted);
  color: var(--text-primary);
  font-family: var(--font-sans);
  border-color: var(--border-medium);
}

.badge-tag.mcq { color: #2B7A78; background: rgba(43, 122, 120, 0.08); }
.badge-tag.msq { color: #8A5082; background: rgba(138, 80, 130, 0.08); }
.badge-tag.nat { color: #C07010; background: rgba(192, 112, 16, 0.08); }

.badge-tag.marks-positive {
  color: var(--color-success);
  background: var(--color-success-bg);
  border-color: var(--color-success-border);
}

.badge-tag.marks-negative {
  color: var(--color-danger);
  background: var(--color-danger-bg);
  border-color: var(--color-danger-border);
}

/* Card Header Action Icons */
.card-header-right {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.card-action-icon {
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  transition: all var(--transition-fast);
}

.card-action-icon:hover {
  color: var(--text-primary);
  background: var(--bg-secondary);
}

.card-action-icon.flagged {
  color: var(--accent-terracotta);
  background: var(--accent-terracotta-soft);
}

.card-action-icon.starred {
  color: var(--color-warning);
}

/* Question Body */
.question-body {
  font-size: 0.98rem;
  line-height: 1.7;
  color: var(--text-primary);
  margin-bottom: 1.4rem;
  word-break: break-word;
}

.question-body p {
  margin-bottom: 0.6rem;
}

/* Question Diagram / Image Container */
.question-diagram-wrap {
  margin: 1rem 0;
  padding: 0.75rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  text-align: center;
}

.question-diagram-img {
  max-width: 100%;
  max-height: 340px;
  object-fit: contain;
  border-radius: var(--radius-sm);
  background: #FFFFFF;
  padding: 0.4rem;
}

/* Options Container */
.options-list {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  margin-bottom: 1.4rem;
}

.option-item {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  padding: 0.8rem 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
}

.option-item:hover {
  background: var(--surface-card);
  border-color: var(--border-medium);
}

.option-item.selected {
  background: var(--accent-terracotta-soft);
  border-color: var(--accent-terracotta);
  box-shadow: 0 0 0 1px var(--accent-terracotta-border);
}

/* In Solution Mode / Instant Check */
.option-item.correct-answer {
  background: var(--color-success-bg) !important;
  border-color: var(--color-success) !important;
}

.option-item.wrong-selected {
  background: var(--color-danger-bg) !important;
  border-color: var(--color-danger) !important;
}

.option-marker {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 1.5px solid var(--border-medium);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.72rem;
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--text-secondary);
  flex-shrink: 0;
  transition: all var(--transition-fast);
  margin-top: 2px;
}

.option-item.selected .option-marker {
  background: var(--accent-terracotta);
  border-color: var(--accent-terracotta);
  color: #FFFFFF;
}

.option-item.correct-answer .option-marker {
  background: var(--color-success);
  border-color: var(--color-success);
  color: #FFFFFF;
}

.option-item.wrong-selected .option-marker {
  background: var(--color-danger);
  border-color: var(--color-danger);
  color: #FFFFFF;
}

.option-text {
  font-size: 0.92rem;
  color: var(--text-primary);
  line-height: 1.5;
  flex: 1;
}

/* NAT (Numerical Answer Type) Input Box */
.nat-input-container {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.4rem;
  flex-wrap: wrap;
}

.nat-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.nat-input {
  width: 180px;
  padding: 0.55rem 0.85rem;
  background: var(--bg-secondary);
  border: 1.5px solid var(--border-medium);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--text-primary);
  outline: none;
  transition: all var(--transition-fast);
}

.nat-input:focus {
  border-color: var(--accent-terracotta);
  background: var(--surface-card);
}

.nat-input.correct {
  border-color: var(--color-success);
  background: var(--color-success-bg);
}

.nat-input.incorrect {
  border-color: var(--color-danger);
  background: var(--color-danger-bg);
}

/* Question Action Footer */
.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-subtle);
  flex-wrap: wrap;
}

.card-footer-left {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-secondary {
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.78rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  transition: all var(--transition-fast);
}

.btn-secondary:hover {
  background: var(--surface-card);
  border-color: var(--border-medium);
  color: var(--text-primary);
}

.btn-terracotta {
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-sm);
  background: var(--accent-terracotta);
  color: #FFFFFF;
  font-size: 0.78rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  transition: all var(--transition-fast);
}

.btn-terracotta:hover {
  background: var(--accent-terracotta-hover);
}

.btn-ghost {
  padding: 0.35rem 0.65rem;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 0.76rem;
  transition: all var(--transition-fast);
}

.btn-ghost:hover {
  color: var(--text-primary);
  background: var(--bg-secondary);
}

/* ==========================================================================
   SOLUTION MODE DRAWER & ACCORDION
   ========================================================================== */

.solution-container {
  margin-top: 1.35rem;
  padding-top: 1.35rem;
  border-top: 1.5px dashed var(--border-medium);
  animation: fadeIn 0.25s ease-out;
}

/* Official Answer Banner */
.official-answer-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  background: var(--surface-muted);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  margin-bottom: 1.1rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.official-answer-left {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.official-key-pill {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--accent-terracotta);
  background: var(--accent-terracotta-soft);
  padding: 0.15rem 0.6rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--accent-terracotta-border);
}

/* Triple Insight Callout Grid (Core Concept, Trap Alert, Shortcut Trick) */
.insights-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 0.85rem;
  margin-bottom: 1.4rem;
}

.insight-card {
  padding: 0.85rem 1rem;
  border-radius: var(--radius-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.insight-card.concept {
  border-left: 3px solid var(--accent-terracotta);
}

.insight-card.trap {
  border-left: 3px solid var(--color-warning);
}

.insight-card.shortcut {
  border-left: 3px solid var(--color-info);
}

.insight-header {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.76rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.insight-card.concept .insight-header { color: var(--accent-terracotta); }
.insight-card.trap .insight-header { color: var(--color-warning); }
.insight-card.shortcut .insight-header { color: var(--color-info); }

.insight-body {
  font-size: 0.84rem;
  color: var(--text-primary);
  line-height: 1.5;
}

/* Continuous Step-by-Step Solver Stream */
.step-solver-wrapper {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.2rem;
  margin-bottom: 1.35rem;
}

.step-solver-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--border-subtle);
}

.step-solver-title {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.steps-timeline {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
}

.step-timeline-row {
  display: flex;
  gap: 1rem;
  position: relative;
}

.step-timeline-indicator {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 28px;
  flex-shrink: 0;
}

.step-number-circle {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--accent-terracotta);
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 700;
  box-shadow: 0 0 0 3px var(--accent-terracotta-soft);
  z-index: 2;
}

.step-connecting-line {
  width: 2px;
  flex: 1;
  background: var(--border-medium);
  margin: 4px 0;
  min-height: 24px;
}

.step-timeline-content {
  flex: 1;
  background: var(--surface-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.85rem 1.1rem;
  margin-bottom: 0.9rem;
  transition: all var(--transition-fast);
}

.step-timeline-content:hover {
  border-color: var(--border-medium);
}

.step-title-text {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
}

.step-detail-text {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
}
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Bespoke Visual SVG Container */
.visual-svg-container {
  background: var(--surface-card);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  padding: 1.1rem;
  text-align: center;
  margin-top: 1rem;
  overflow-x: auto;
}

.visual-svg-header {
  font-size: 0.76rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
}

.visual-svg-element {
  max-width: 100%;
  height: auto;
  display: inline-block;
}

/* ==========================================================================
   MODALS: Analytics & Calculator & Formula Drawer
   ========================================================================== */

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(18, 17, 16, 0.65);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.modal-backdrop.open {
  opacity: 1;
  pointer-events: auto;
}

.modal-card {
  background: var(--surface-card);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-floating);
  width: 100%;
  max-width: 720px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transform: scale(0.96);
  transition: transform var(--transition-normal);
}

.modal-backdrop.open .modal-card {
  transform: scale(1);
}

.modal-header {
  padding: 1.1rem 1.4rem;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
}

.modal-body {
  padding: 1.4rem;
  overflow-y: auto;
}

/* Analytics Stats Grid */
.analytics-summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 0.9rem;
  margin-bottom: 1.5rem;
}

.analytics-stat-card {
  padding: 0.85rem;
  border-radius: var(--radius-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  text-align: center;
}

.analytics-stat-val {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--accent-terracotta);
  line-height: 1.1;
}

.analytics-stat-label {
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: 0.35rem;
}

/* Side Drawers (Formula Drawer) */
.drawer-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(18, 17, 16, 0.5);
  backdrop-filter: blur(3px);
  -webkit-backdrop-filter: blur(3px);
  z-index: 180;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.drawer-backdrop.open {
  opacity: 1;
  pointer-events: auto;
}

.slide-drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  max-width: 500px;
  background: var(--surface-elevated);
  border-left: 1px solid var(--border-medium);
  box-shadow: var(--shadow-floating);
  z-index: 190;
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform var(--transition-smooth);
}

.slide-drawer.open {
  transform: translateX(0);
}

.drawer-header {
  padding: 1.2rem 1.4rem;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.drawer-title {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
}

.drawer-content {
  padding: 1.4rem;
  overflow-y: auto;
  flex: 1;
}

/* Toast Notifications */
.toast-notice {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--surface-elevated);
  border: 1px solid var(--border-medium);
  box-shadow: var(--shadow-lg);
  padding: 0.65rem 1.2rem;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  z-index: 300;
  opacity: 0;
  pointer-events: none;
  transition: all var(--transition-normal);
}

.toast-notice.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
  pointer-events: auto;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
}