/**
 * MathPulse K-12 - Component Styles (2026 Edition)
 */

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.4rem;
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
  white-space: nowrap;
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #ffffff;
  box-shadow: 0 4px 14px var(--color-primary-glow);
}

.btn-primary:hover {
  filter: brightness(1.1);
  box-shadow: 0 6px 20px var(--color-primary-glow);
  transform: translateY(-2px);
}

.btn-secondary {
  background: var(--color-surface-hover);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  border-color: var(--color-primary);
  background: var(--color-bg-secondary);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 1rem 2rem;
  font-size: 1.1rem;
  border-radius: var(--radius-lg);
}

.w-100 {
  width: 100%;
}

/* G4MEZ Heartbeat Pulse Button */
@keyframes g4mez-heartbeat {
  0% {
    transform: scale(1);
    box-shadow: 0 0 0 0 rgba(244, 63, 94, 0.7);
  }
  14% {
    transform: scale(1.1);
    box-shadow: 0 0 14px 4px rgba(244, 63, 94, 0.9);
  }
  28% {
    transform: scale(1);
    box-shadow: 0 0 0 0 rgba(244, 63, 94, 0.7);
  }
  42% {
    transform: scale(1.12);
    box-shadow: 0 0 18px 6px rgba(236, 72, 153, 0.9);
  }
  70% {
    transform: scale(1);
    box-shadow: 0 0 0 0 rgba(244, 63, 94, 0);
  }
  100% {
    transform: scale(1);
    box-shadow: 0 0 0 0 rgba(244, 63, 94, 0);
  }
}

.btn-g4mez {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  padding: 0.4rem 0.95rem;
  font-size: 0.85rem;
  font-weight: 900;
  letter-spacing: 0.05em;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, #f43f5e 0%, #ec4899 50%, #8b5cf6 100%);
  color: #ffffff !important;
  border: 1px solid rgba(255, 255, 255, 0.35);
  box-shadow: 0 3px 12px rgba(244, 63, 94, 0.45);
  animation: g4mez-heartbeat 1.8s infinite ease-in-out;
  cursor: pointer;
  text-decoration: none;
  text-transform: uppercase;
  user-select: none;
  white-space: nowrap !important;
  flex-shrink: 0;
  line-height: 1;
  transition: filter 0.2s ease, transform 0.2s ease;
  margin-left: 0.25rem;
}

.btn-g4mez:hover {
  filter: brightness(1.2) contrast(1.1);
  animation-play-state: paused;
  transform: scale(1.12);
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.75rem;
  font-size: 0.78rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.badge-primary {
  background: rgba(56, 189, 248, 0.15);
  color: var(--color-primary);
  border: 1px solid rgba(56, 189, 248, 0.3);
}

.badge-accent {
  background: rgba(168, 85, 247, 0.15);
  color: var(--color-accent);
  border: 1px solid rgba(168, 85, 247, 0.3);
}

.badge-category {
  background: var(--color-bg-secondary);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}

.badge-success {
  background: rgba(16, 185, 129, 0.15);
  color: var(--color-success);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

/* Hero Section */
.hero-section {
  padding: clamp(3rem, 7vw, 5.5rem) 0 3rem;
  text-align: center;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.hero-title {
  font-size: clamp(2.2rem, 5.5vw, 4.2rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

.hero-gradient-text {
  background: linear-gradient(135deg, #38bdf8 0%, #a855f7 50%, #ec4899 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--color-text-muted);
  max-width: 680px;
  margin: 0 auto 2.25rem;
  line-height: 1.6;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 3.5rem;
}

/* Quick Metrics Row */
.metrics-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
  margin-top: 1rem;
}

.metric-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-normal);
}

.metric-card:hover {
  transform: translateY(-3px);
  border-color: var(--color-border-hover);
}

.metric-icon-box {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
}

.metric-content h4 {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--color-text);
  line-height: 1.1;
}

.metric-content p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-top: 0.2rem;
}

/* Search & Filter Toolbar */
.filter-toolbar {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: 2.5rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.search-input-wrapper {
  position: relative;
  width: 100%;
}

.search-input-icon {
  position: absolute;
  left: 1.2rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.2rem;
  color: var(--color-text-dim);
  pointer-events: none;
}

.search-input {
  width: 100%;
  padding: 0.95rem 1rem 0.95rem 3.2rem;
  font-size: 1.05rem;
  background: var(--color-bg-secondary);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  outline: none;
  transition: all var(--transition-fast);
}

.search-input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-glow);
}

.grade-pills-scroll {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
  scrollbar-width: thin;
}

.grade-pill-btn {
  padding: 0.55rem 1.1rem;
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-text-muted);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.grade-pill-btn:hover {
  color: var(--color-text);
  border-color: var(--color-primary);
}

.grade-pill-btn.active {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
  box-shadow: 0 4px 12px var(--color-primary-glow);
}

.filter-sub-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.category-select-wrapper {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.category-select {
  padding: 0.5rem 1rem;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: 0.9rem;
  outline: none;
  cursor: pointer;
}

.status-filter-pills {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.status-pill-btn {
  padding: 0.4rem 0.9rem;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-text-muted);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
}

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

/* Topics Cards Grid */
.topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}

.topic-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.topic-card:hover {
  transform: translateY(-5px);
  border-color: var(--color-border-hover);
  box-shadow: var(--shadow-md);
}

.topic-card-top {
  margin-bottom: 1.25rem;
}

.topic-badges-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.topic-title-box {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.topic-icon-large {
  font-size: 2rem;
  line-height: 1;
}

.topic-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.35;
}

.topic-card-summary {
  font-size: 0.92rem;
  color: var(--color-text-muted);
  line-height: 1.55;
}

.topic-card-formula-preview {
  margin-top: 1rem;
  padding: 0.6rem 0.85rem;
  background: var(--color-bg-secondary);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-primary);
  border-left: 3px solid var(--color-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.topic-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 1.5rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--color-border);
}

.topic-card-btn {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--color-primary);
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.topic-card:hover .topic-card-btn {
  color: var(--color-accent);
}

/* Modal Lesson Overlay */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-dialog {
  background: var(--color-surface-solid);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 720px;
  max-height: 88vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  padding: clamp(1.5rem, 4vw, 2.5rem);
  position: relative;
  transform: translateY(20px);
  transition: transform var(--transition-normal);
}

.modal-overlay.active .modal-dialog {
  transform: translateY(0);
}

.modal-close-btn {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
}

.modal-close-btn:hover {
  background: var(--color-surface-hover);
  color: var(--color-text);
}

/* Modal Content Details */
.modal-lesson-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.modal-lesson-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.modal-bookmark-btn {
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.4rem 0.85rem;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  transition: all var(--transition-fast);
}

.modal-bookmark-btn.active {
  color: #f59e0b;
  border-color: #f59e0b;
  background: rgba(245, 158, 11, 0.1);
}

.modal-lesson-title {
  font-size: clamp(1.5rem, 3.5vw, 2rem);
  font-weight: 800;
  margin-bottom: 0.75rem;
  color: var(--color-text);
  line-height: 1.25;
}

.modal-lesson-summary {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 1.75rem;
}

.modal-card {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin-bottom: 1.25rem;
}

.modal-card h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--color-text);
}

.modal-card p {
  color: var(--color-text-muted);
  line-height: 1.6;
  font-size: 0.95rem;
}

.modal-formula-box {
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.1), rgba(168, 85, 247, 0.1));
  border: 1px solid var(--color-border-hover);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin-bottom: 1.25rem;
  text-align: center;
}

.formula-label {
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--color-primary);
  display: block;
  margin-bottom: 0.4rem;
}

.formula-math {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
}

.example-problem {
  font-size: 0.95rem;
  margin-bottom: 0.75rem;
  color: var(--color-text);
}

.example-details summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--color-primary);
  user-select: none;
  margin-bottom: 0.5rem;
}

.example-steps-list {
  margin-left: 1.25rem;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 0.75rem;
}

.example-final-answer {
  background: var(--color-surface);
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  color: var(--color-success);
}

.modal-card-realworld {
  border-left: 3px solid var(--color-accent);
}

.modal-quiz-trigger-zone {
  margin-top: 2rem;
}

/* Quiz Engine Card UI */
.quiz-card {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  margin-top: 1rem;
}

.quiz-header {
  margin-bottom: 1.25rem;
}

.quiz-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.quiz-counter {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-text-muted);
}

.quiz-progress-bar {
  height: 6px;
  background: var(--color-border);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.quiz-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  transition: width var(--transition-normal);
}

.quiz-question-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  color: var(--color-text);
  line-height: 1.4;
}

.quiz-options-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.quiz-option-btn {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.9rem 1.25rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  text-align: left;
  font-size: 0.95rem;
  color: var(--color-text);
  transition: all var(--transition-fast);
}

.quiz-option-btn:hover:not(:disabled) {
  border-color: var(--color-primary);
  background: var(--color-surface-hover);
  transform: translateX(4px);
}

.option-letter {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.85rem;
}

.quiz-option-btn.option-correct {
  background: rgba(16, 185, 129, 0.15) !important;
  border-color: var(--color-success) !important;
  color: var(--color-success);
}

.quiz-option-btn.option-incorrect {
  background: rgba(239, 68, 68, 0.15) !important;
  border-color: var(--color-danger) !important;
  color: var(--color-danger);
}

.quiz-feedback-box {
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  display: flex;
  gap: 1rem;
  margin-bottom: 1.25rem;
  font-size: 0.95rem;
}

.feedback-correct {
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: var(--color-success);
}

.feedback-incorrect {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: var(--color-danger);
}

.feedback-explanation {
  font-size: 0.9rem;
  margin-top: 0.3rem;
  color: var(--color-text);
}

.quiz-summary-card {
  text-align: center;
  padding: 2rem 1.5rem;
}

.summary-icon {
  font-size: 3.5rem;
  margin-bottom: 1rem;
}

.summary-title {
  font-size: 1.75rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
}

.summary-subtitle {
  color: var(--color-text-muted);
  font-size: 1.05rem;
  margin-bottom: 2rem;
}

.summary-stats-row {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.summary-stat-chip {
  padding: 1rem 1.5rem;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
}

.stat-num {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-primary);
}

.stat-lbl {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-top: 0.2rem;
}

.summary-actions {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}