/* ═══════════════════════════════════════════════════════════
   FRAMEWORKS PAGE — styles
   (design tokens inherited from style.css)
   ═══════════════════════════════════════════════════════════ */

.frameworks-main {
  position: relative;
  z-index: 1;
  padding-top: 40px;
  padding-bottom: 60px;
}

/* ── HERO ──────────────────────────────────────────────────── */
.frameworks-hero {
  max-width: 820px;
  margin-bottom: 36px;
}

.frameworks-hero h1 {
  font-family: var(--font-title);
  font-size: clamp(1.9rem, 4.5vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-bottom: 14px;
}

.frameworks-hero-sub {
  color: var(--text-dim);
  font-size: 1rem;
  line-height: 1.7;
  max-width: 700px;
}

/* ── LESSON: WHY FRAMEWORKS ────────────────────────────────── */
.lesson-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  margin-bottom: 40px;
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
}

.lesson-card h2 {
  font-family: var(--font-title);
  font-size: 1.75rem;
  margin-bottom: 16px;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 10px;
}

.lesson-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 24px;
}

@media (min-width: 768px) {
  .lesson-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.lesson-item {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  transition: var(--transition);
}

.lesson-item:hover {
  background: rgba(255, 255, 255, 0.04);
  transform: translateY(-2px);
  border-color: rgba(6, 182, 212, 0.2);
}

.lesson-item h3 {
  font-family: var(--font-title);
  font-size: 1.15rem;
  margin-bottom: 8px;
  color: var(--secondary);
}

.lesson-item p {
  color: var(--text-dim);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* ── INTERACTIVE SANDBOX ────────────────────────────────────── */
.sandbox-section {
  margin-bottom: 48px;
  scroll-margin-top: var(--anchor-offset, 130px);
}

.sandbox-header {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 24px;
}

@media (min-width: 768px) {
  .sandbox-header {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

.sandbox-title h2 {
  font-family: var(--font-title);
  font-size: 1.75rem;
  margin-bottom: 4px;
}

.sandbox-title p {
  color: var(--text-dim);
  font-size: 0.95rem;
}

.task-selector-wrapper {
  display: flex;
  align-items: center;
  gap: 12px;
}

.task-selector-wrapper label {
  color: var(--text-dim);
  font-size: 0.9rem;
  font-weight: 500;
}

.dropdown-label {
  color: var(--text-dim);
  font-size: 0.9rem;
  font-weight: 500;
}

.custom-dropdown {
  position: relative;
  width: 270px;
  display: inline-block;
  text-align: left;
}

.dropdown-toggle {
  width: 100%;
  background: #0d1326;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 16px;
  border-radius: 8px;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: var(--transition);
  outline: none;
}

.dropdown-toggle:focus, .dropdown-toggle.active {
  border-color: var(--secondary);
  box-shadow: 0 0 0 2px rgba(6, 182, 212, 0.15);
}

.dropdown-arrow {
  color: var(--text-dim);
  transition: transform 0.2s ease;
}

.dropdown-toggle.active .dropdown-arrow {
  transform: rotate(180deg);
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  margin-top: 6px;
  background: rgba(13, 19, 38, 0.96);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  border-radius: 8px;
  list-style: none;
  padding: 6px 0;
  margin-bottom: 0;
  z-index: 1000;
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.5);
  transform: translateY(-8px);
  opacity: 0;
  pointer-events: none;
  /* visibility joins the transition so a closed menu can't be
     tabbed into or announced by screen readers (opacity alone
     leaves it in the tab order) */
  visibility: hidden;
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1),
              opacity 0.2s ease,
              visibility 0.2s;
}

.dropdown-menu.show {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
  visibility: visible;
}

.dropdown-option {
  padding: 10px 16px;
  font-size: 0.88rem;
  color: var(--text-dim);
  cursor: pointer;
  transition: var(--transition);
}

.dropdown-option:hover {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
}

.dropdown-option.active {
  color: var(--secondary);
  background: rgba(6, 182, 212, 0.08);
  font-weight: 600;
  border-left: 3px solid var(--secondary);
  padding-left: 13px; /* Offset padding for border */
}

.task-select:focus {
  outline: none;
  border-color: var(--secondary);
  box-shadow: 0 0 0 2px rgba(6, 182, 212, 0.15);
}

.sandbox-tabs-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

@media (min-width: 1024px) {
  .sandbox-tabs-container {
    grid-template-columns: 1fr 1fr;
  }
}

.sandbox-panel {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
  display: flex;
  flex-direction: column;
}

.panel-top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  background: rgba(0, 0, 0, 0.2);
  border-bottom: 1px solid var(--border);
}

.panel-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-title);
  font-weight: 600;
  font-size: 1rem;
}

.panel-brand.react { color: #58c4dc; }
.panel-brand.angular { color: #dd0031; }

.panel-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.file-name {
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

.btn-copy-code {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 5px 12px;
  border-radius: 6px;
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}

.btn-copy-code:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
}

.code-pre-wrap {
  margin: 0;
  padding: 20px;
  background: #04060b;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.6;
  color: #dbe4f0;
  tab-size: 2;
  flex-grow: 1;
}

.code-pre-wrap code {
  font-family: inherit;
}

.panel-desc-bar {
  padding: 16px 20px;
  border-top: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.1);
  font-size: 0.88rem;
  line-height: 1.5;
  color: var(--text-dim);
}

.panel-desc-bar strong {
  color: var(--text);
}

/* ── DEEP DIVE: ANGULAR VS REACT POPULARITY ────────────────── */
.popularity-section {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px;
  margin-bottom: 48px;
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
}

.popularity-section h2 {
  font-family: var(--font-title);
  font-size: 1.8rem;
  margin-bottom: 20px;
}

.pop-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

@media (min-width: 768px) {
  .pop-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.pop-card {
  padding: 20px;
  background: rgba(255, 255, 255, 0.01);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.pop-card h3 {
  font-family: var(--font-title);
  font-size: 1.2rem;
  margin-bottom: 10px;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.pop-card p {
  color: var(--text-dim);
  font-size: 0.92rem;
  line-height: 1.6;
}

/* ── CODE SYNTAX HIGHLIGHTING TOKENS ──────────────────────── */
.tok-keyword { color: #c792ea; font-weight: 600; }
.tok-string  { color: #a5e08c; }
.tok-comment { color: #5c6a82; font-style: italic; }
.tok-number  { color: #f7a35c; }
.tok-literal { color: #64c9e8; }
.tok-tag     { color: #ff5370; }
.tok-attr    { color: #ffcb6b; }
.tok-type    { color: #82aaff; }
.tok-func    { color: #82b1ff; }
.tok-entity  { color: #decb6b; }

/* ── INTERACTIVE PREVIEW CONTAINER ─────────────────────────── */
.sandbox-preview-container {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-top: 24px;
  overflow: hidden;
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.35);
}

.preview-header {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 12px 18px;
  background: rgba(0, 0, 0, 0.25);
  border-bottom: 1px solid var(--border);
}

.preview-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  opacity: 0.7;
}
.preview-dot.red { background: #ef4444; }
.preview-dot.yellow { background: #f59e0b; }
.preview-dot.green { background: #10b981; }

.preview-title {
  color: var(--text-dim);
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 600;
  margin-left: 6px;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.preview-viewport-content {
  padding: 24px;
  background: #030509;
  min-height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ── PREVIEW COMPONENT WIDGETS ──────────────────────────────── */
.widget-box {
  background: rgba(15, 22, 42, 0.9);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 10px;
  padding: 24px;
  width: 100%;
  max-width: 440px;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
  text-align: center;
  transition: var(--transition);
}

.widget-box h4 {
  font-family: var(--font-title);
  margin-bottom: 14px;
  font-size: 1.1rem;
  color: var(--text);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  padding-bottom: 8px;
}

.widget-display {
  font-size: 2.2rem;
  font-weight: 700;
  font-family: var(--font-title);
  color: var(--secondary);
  margin: 14px 0;
}

.widget-btn {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border: none;
  color: var(--text);
  padding: 10px 22px;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: 6px;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 4px 14px rgba(6, 182, 212, 0.2);
}

.widget-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(6, 182, 212, 0.35);
}

/* Todo list preview item */
.todo-preview-input-group {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
}

.preview-input {
  flex-grow: 1;
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 8px 12px;
  border-radius: 6px;
  font-family: var(--font-sans);
  font-size: 0.9rem;
}

.preview-input:focus {
  outline: none;
  border-color: var(--secondary);
}

.todo-preview-list {
  list-style: none;
  padding: 0;
  text-align: left;
  max-height: 150px;
  overflow-y: auto;
}

.todo-preview-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border);
  border-radius: 6px;
  margin-bottom: 6px;
  font-size: 0.88rem;
}

.btn-delete-todo {
  background: none;
  border: none;
  color: var(--danger);
  font-size: 1.1rem;
  cursor: pointer;
  line-height: 1;
  padding: 2px 6px;
  opacity: 0.6;
  transition: var(--transition);
}

.btn-delete-todo:hover {
  opacity: 1;
  transform: scale(1.1);
}

/* Two-way binding preview badge */
.avatar-preview-badge {
  display: inline-block;
  background: linear-gradient(135deg, rgba(6, 182, 212, 0.15), rgba(139, 92, 246, 0.15));
  border: 1px solid var(--border);
  padding: 12px 24px;
  border-radius: 30px;
  margin-top: 14px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text);
}

/* Skeleton Loading styles */
.skeleton-loader {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 8px 0;
}

.skeleton-line {
  height: 12px;
  background: linear-gradient(90deg, rgba(255, 255, 255, 0.03) 25%, rgba(255, 255, 255, 0.08) 50%, rgba(255, 255, 255, 0.03) 75%);
  background-size: 200% 100%;
  animation: loadingPulse 1.5s infinite;
  border-radius: 4px;
}
.skeleton-line.w-80 { width: 80%; }
.skeleton-line.w-60 { width: 60%; }
.skeleton-line.w-90 { width: 90%; }

@keyframes loadingPulse {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.user-item-preview {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  text-align: left;
  font-size: 0.85rem;
}

.user-avatar-circle {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--secondary);
}

.btn-danger-preview {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.2);
  color: var(--danger);
}

.btn-danger-preview:hover {
  background: rgba(239, 68, 68, 0.2);
  border-color: rgba(239, 68, 68, 0.4);
}

.btn-row {
  display: flex;
  gap: 10px;
  justify-content: center;
  margin-top: 14px;
}

/* Component Communication layout */
.comm-layout {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.comm-node {
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--border);
  padding: 14px;
  border-radius: 8px;
}
.comm-node.child {
  border-color: rgba(139, 92, 246, 0.3);
  background: rgba(139, 92, 246, 0.02);
}

/* Shared state dashboard mockup */
.dashboard-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 14px;
}
.dashboard-widget {
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--border);
  padding: 12px;
  border-radius: 8px;
  font-size: 0.85rem;
}

/* Validation form layout */
.validation-form {
  display: flex;
  flex-direction: column;
  gap: 10px;
  text-align: left;
}
.validation-form .preview-input {
  width: 100%;
}
.validation-form label {
  font-size: 0.8rem;
  color: var(--text-dim);
}
.validation-error-text {
  font-size: 0.75rem;
  color: var(--danger);
  margin-top: 2px;
}
.validation-success-text {
  font-size: 0.75rem;
  color: var(--accent);
  margin-top: 2px;
}

/* Dynamic routing mock window */
.routing-address-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  background: #020305;
  border: 1px solid var(--border);
  padding: 8px 12px;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-bottom: 14px;
  text-align: left;
}
.address-input-value {
  color: var(--text);
  font-weight: 500;
}

/* ── FRAMEWORK DIAGNOSTIC QUIZ ────────────────────────────── */
.quiz-section {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px;
  margin-bottom: 48px;
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
}

.quiz-section h2 {
  font-family: var(--font-title);
  font-size: 1.8rem;
  margin-bottom: 8px;
}

.quiz-form-grid {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-top: 28px;
}

.quiz-q-card {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px 24px;
  background: rgba(255, 255, 255, 0.015);
}

.quiz-q-card legend {
  font-family: var(--font-title);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--secondary);
  padding: 0 8px;
}

.quiz-q-text {
  font-size: 1.05rem;
  font-weight: 500;
  margin-bottom: 14px;
  color: var(--text);
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.option-label {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 16px;
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  transition: var(--transition);
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--text-dim);
}

.option-label:hover {
  background: rgba(255, 255, 255, 0.03);
  border-color: rgba(255, 255, 255, 0.15);
  color: var(--text);
}

.option-label input[type="radio"] {
  margin-top: 4px;
  accent-color: var(--secondary);
  cursor: pointer;
}

.quiz-submit-row {
  display: flex;
  justify-content: flex-end;
  margin-top: 10px;
}

.btn-submit-quiz {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border: none;
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  padding: 12px 32px;
  border-radius: 8px;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 4px 16px rgba(139, 92, 246, 0.25);
}

.btn-submit-quiz:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(139, 92, 246, 0.4);
}

.quiz-results-panel {
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid rgba(6, 182, 212, 0.25);
  border-radius: 8px;
  padding: 28px;
  margin-top: 32px;
  box-shadow: inset 0 0 20px rgba(6, 182, 212, 0.05);
  animation: fadeIn 0.4s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.quiz-results-panel h3 {
  font-family: var(--font-title);
  font-size: 1.4rem;
  color: var(--secondary);
  margin-bottom: 20px;
  text-align: center;
}

.results-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-bottom: 20px;
}

@media (min-width: 768px) {
  .results-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.result-score-bar-wrapper {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.score-bar-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.88rem;
  color: var(--text-dim);
  font-weight: 500;
}

.score-bar-bg {
  height: 12px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 6px;
  overflow: hidden;
}

.score-bar-fill {
  height: 100%;
  border-radius: 6px;
  transition: width 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.score-bar-fill.react-fill {
  background: #58c4dc;
  box-shadow: 0 0 8px rgba(88, 196, 220, 0.4);
}

.score-bar-fill.angular-fill {
  background: #dd0031;
  box-shadow: 0 0 8px rgba(221, 0, 49, 0.4);
}

.quiz-verdict-summary {
  font-size: 1rem;
  line-height: 1.65;
  color: var(--text-dim);
  margin-bottom: 24px;
}

.btn-reset-quiz {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-dim);
  padding: 8px 16px;
  border-radius: 6px;
  cursor: pointer;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 500;
  transition: var(--transition);
}

.btn-reset-quiz:hover {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
  border-color: rgba(255, 255, 255, 0.2);
}

/* ── FRONTEND ONLY DEV CONSIDERATIONS ─────────────────────── */
.frontend-dev-section {
  margin-bottom: 48px;
}

.frontend-dev-section h2 {
  font-family: var(--font-title);
  font-size: 1.75rem;
  margin-bottom: 8px;
}

.frontend-dev-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 24px;
}

@media (min-width: 768px) {
  .frontend-dev-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.frontend-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.2);
  transition: var(--transition);
}

.frontend-card:hover {
  background: rgba(255, 255, 255, 0.03);
  border-color: rgba(6, 182, 212, 0.25);
  transform: translateY(-2px);
}

.frontend-card-icon {
  width: 48px;
  height: 48px;
  border-radius: 8px;
  background: rgba(6, 182, 212, 0.1);
  color: var(--secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.frontend-card h3 {
  font-family: var(--font-title);
  font-size: 1.2rem;
  margin-bottom: 10px;
  color: var(--text);
}

.frontend-card p {
  color: var(--text-dim);
  font-size: 0.9rem;
  line-height: 1.6;
}