.qd-hero {
      padding: 160px 0 80px;
      position: relative;
      overflow: hidden;
      background: var(--bg2);
  }

  .qd-hero-grid {
      position: absolute;
      inset: 0;
      pointer-events: none;
      background-image: linear-gradient(var(--border) 1px, transparent 1px),
          linear-gradient(90deg, var(--border) 1px, transparent 1px);
      background-size: 60px 60px;
      opacity: 0.4;
  }

  .qd-hero-orb-1 {
      position: absolute;
      top: -120px;
      right: -80px;
      width: 600px;
      height: 600px;
      border-radius: 50%;
      background: radial-gradient(circle, rgba(249, 115, 22, 0.15) 0%, transparent 70%);
      pointer-events: none;
  }

  .qd-hero-orb-2 {
      position: absolute;
      bottom: -100px;
      left: -100px;
      width: 500px;
      height: 500px;
      border-radius: 50%;
      background: radial-gradient(circle, rgba(168, 85, 247, 0.12) 0%, transparent 70%);
      pointer-events: none;
  }

  .qd-breadcrumb {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 13px;
      color: var(--text3);
      margin-bottom: 28px;
  }

  .qd-breadcrumb a {
      color: var(--text2);
      transition: color 0.2s;
  }

  .qd-breadcrumb a:hover {
      color: var(--accent);
  }

  .qd-breadcrumb-sep {
      color: var(--text3);
  }

  .qd-hero-inner {
      display: grid;
      grid-template-columns: 1fr 380px;
      gap: 60px;
      align-items: start;
      position: relative;
      z-index: 1;
  }

  .qd-badge-row {
      display: flex;
      align-items: center;
      gap: 10px;
      margin-bottom: 20px;
      flex-wrap: wrap;
  }

  .qd-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 5px 14px;
      border-radius: 999px;
      font-size: 12px;
      font-weight: 600;
      letter-spacing: 0.05em;
  }

  .qd-badge-interview {
      background: rgba(6, 182, 212, 0.12);
      color: #06b6d4;
      border: 1px solid rgba(6, 182, 212, 0.25);
  }

  .qd-badge-js {
      background: rgba(249, 200, 22, 0.1);
      color: #f5c518;
      border: 1px solid rgba(245, 197, 24, 0.25);
  }

  .qd-badge-free {
      background: rgba(34, 197, 94, 0.1);
      color: #22c55e;
      border: 1px solid rgba(34, 197, 94, 0.25);
  }

  .qd-badge-hot {
      background: rgba(249, 115, 22, 0.12);
      color: var(--accent);
      border: 1px solid rgba(249, 115, 22, 0.3);
  }

  .qd-hero-title {
      font-size: clamp(2.2rem, 5vw, 3.6rem);
      font-weight: 700;
      line-height: 1.1;
      margin-bottom: 20px;
  }

  .qd-hero-desc {
      font-size: 1.05rem;
      color: var(--text2);
      line-height: 1.75;
      margin-bottom: 32px;
      max-width: 600px;
  }

  .qd-meta-row {
      display: flex;
      align-items: center;
      gap: 24px;
      flex-wrap: wrap;
      margin-bottom: 36px;
  }

  .qd-meta-item {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 14px;
      color: var(--text2);
  }

  .qd-meta-item iconify-icon {
      color: var(--accent);
  }

  .qd-meta-item strong {
      color: var(--text);
      font-weight: 600;
  }

  .qd-progress-bar-wrap {
      margin-bottom: 32px;
  }

  .qd-progress-label {
      display: flex;
      justify-content: space-between;
      font-size: 13px;
      color: var(--text2);
      margin-bottom: 8px;
  }

  .qd-progress-track {
      height: 6px;
      background: var(--border);
      border-radius: 999px;
      overflow: hidden;
  }

  .qd-progress-fill {
      height: 100%;
      background: var(--grad);
      border-radius: 999px;
      width: 0%;
      transition: width 1s var(--ease-out);
  }

  .qd-action-row {
      display: flex;
      gap: 12px;
      flex-wrap: wrap;
  }

  /* Sidebar Card */
  .qd-sidebar-card {
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: var(--radius-xl);
      overflow: hidden;
      position: sticky;
      top: 100px;
      backdrop-filter: blur(10px);
  }

  .qd-sidebar-thumb {
      height: 180px;
      background: linear-gradient(160deg, #06b6d4 0%, #667eea 40%, #f97316 100%);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 5rem;
      position: relative;
  }

  .qd-sidebar-thumb-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(to bottom, transparent 40%, rgba(0, 0, 0, 0.5));
  }

  .qd-sidebar-emoji {
      position: relative;
      z-index: 1;
      filter: drop-shadow(0 4px 20px rgba(0, 0, 0, 0.4));
  }

  .qd-sidebar-body {
      padding: 24px;
  }

  .qd-sidebar-stat-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
      margin-bottom: 20px;
  }

  .qd-sidebar-stat {
      background: var(--bg3);
      border-radius: var(--radius-md);
      padding: 14px;
      text-align: center;
  }

  .qd-sidebar-stat-num {
      display: block;
      font-family: var(--font-display);
      font-size: 1.4rem;
      font-weight: 700;
      color: var(--text);
  }

  .qd-sidebar-stat-lbl {
      display: block;
      font-size: 11px;
      color: var(--text3);
      text-transform: uppercase;
      letter-spacing: 0.07em;
      margin-top: 2px;
  }

  .qd-dl-btn {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 10px;
      width: 100%;
      padding: 16px;
      border-radius: var(--radius-lg);
      background: linear-gradient(135deg, #f97316, #ec4899);
      color: #fff;
      font-family: var(--font-display);
      font-size: 15px;
      font-weight: 700;
      border: none;
      cursor: pointer;
      transition: var(--transition);
      box-shadow: 0 6px 24px rgba(249, 115, 22, 0.35);
      margin-bottom: 12px;
  }

  .qd-dl-btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 10px 36px rgba(249, 115, 22, 0.45);
  }

  .qd-share-btn {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 10px;
      width: 100%;
      padding: 14px;
      border-radius: var(--radius-lg);
      background: transparent;
      color: var(--text2);
      border: 1.5px solid var(--border);
      font-family: var(--font-display);
      font-size: 14px;
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition);
  }

  .qd-share-btn:hover {
      border-color: var(--border-h);
      color: var(--accent);
  }

  .qd-sidebar-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 16px;
  }

  .qd-tag {
      padding: 5px 12px;
      border-radius: 999px;
      background: var(--bg3);
      border: 1px solid var(--border);
      font-size: 12px;
      color: var(--text2);
      font-weight: 500;
  }

  .qd-sidebar-divider {
      height: 1px;
      background: var(--border);
      margin: 20px 0;
  }

  /* ── TOPIC FILTER STRIP ── */
  .qd-filter-strip {
      background: var(--bg2);
      border-bottom: 1px solid var(--border);
      padding: 0;
      position: sticky;
      top: 70px;
      z-index: 50;
  }

  .qd-filter-inner {
      display: flex;
      align-items: center;
      gap: 8px;
      padding: 14px 0;
      overflow-x: auto;
      scrollbar-width: none;
  }

  .qd-filter-inner::-webkit-scrollbar {
      display: none;
  }

  .qd-filter-btn {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 8px 18px;
      border-radius: 999px;
      font-size: 13px;
      font-weight: 600;
      white-space: nowrap;
      background: var(--bg3);
      color: var(--text2);
      border: 1px solid var(--border);
      cursor: pointer;
      transition: var(--transition);
  }

  .qd-filter-btn:hover,
  .qd-filter-btn.active {
      background: rgba(249, 115, 22, 0.1);
      color: var(--accent);
      border-color: rgba(249, 115, 22, 0.35);
  }

  .qd-filter-count {
      width: 20px;
      height: 20px;
      border-radius: 50%;
      background: var(--border);
      color: var(--text3);
      font-size: 10px;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
  }

  .qd-filter-btn.active .qd-filter-count {
      background: var(--accent);
      color: #fff;
  }

  /* ── QUESTION SECTION ── */
  .qd-section {
      padding: 60px 0;
  }

  .qd-section-inner {
      display: grid;
      grid-template-columns: 1fr;
      gap: 0;
  }

  .qd-topic-header {
      display: flex;
      align-items: center;
      gap: 16px;
      margin-bottom: 28px;
      padding: 24px 28px;
      background: var(--bg2);
      border: 1px solid var(--border);
      border-radius: var(--radius-xl);
      position: relative;
      overflow: hidden;
  }

  .qd-topic-header::before {
      content: '';
      position: absolute;
      left: 0;
      top: 0;
      bottom: 0;
      width: 4px;
      background: var(--topic-color, var(--accent));
      border-radius: 4px 0 0 4px;
  }

  .qd-topic-icon {
      width: 52px;
      height: 52px;
      border-radius: var(--radius-md);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.6rem;
      background: var(--bg3);
      flex-shrink: 0;
  }

  .qd-topic-info {}

  .qd-topic-name {
      font-family: var(--font-display);
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--text);
  }

  .qd-topic-sub {
      font-size: 13px;
      color: var(--text3);
      margin-top: 2px;
  }

  .qd-topic-pill {
      margin-left: auto;
      padding: 5px 14px;
      border-radius: 999px;
      font-size: 12px;
      font-weight: 700;
      white-space: nowrap;
      background: rgba(249, 115, 22, 0.1);
      color: var(--accent);
      border: 1px solid rgba(249, 115, 22, 0.2);
  }

  /* Q&A Card */
  .qd-qa-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
      margin-bottom: 40px;
  }

  .qd-qa-card {
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      overflow: hidden;
      transition: var(--transition);
  }

  .qd-qa-card:hover {
      border-color: var(--border-h);
      box-shadow: var(--shadow-md);
      transform: translateX(3px);
  }

  .qd-qa-question {
      display: flex;
      align-items: center;
      gap: 16px;
      padding: 20px 24px;
      cursor: pointer;
      user-select: none;
  }

  .qd-q-num {
      width: 32px;
      height: 32px;
      border-radius: 8px;
      flex-shrink: 0;
      display: flex;
      align-items: center;
      justify-content: center;
      font-family: var(--font-display);
      font-size: 13px;
      font-weight: 700;
      background: rgba(249, 115, 22, 0.1);
      color: var(--accent);
      border: 1px solid rgba(249, 115, 22, 0.2);
  }

  .qd-q-text {
      flex: 1;
      font-family: var(--font-display);
      font-size: 0.97rem;
      font-weight: 600;
      color: var(--text);
      line-height: 1.4;
  }

  .qd-q-diff {
      padding: 3px 10px;
      border-radius: 999px;
      font-size: 11px;
      font-weight: 700;
      flex-shrink: 0;
  }

  .diff-easy {
      background: rgba(34, 197, 94, 0.1);
      color: #22c55e;
      border: 1px solid rgba(34, 197, 94, 0.2);
  }

  .diff-medium {
      background: rgba(249, 200, 22, 0.1);
      color: #f5c518;
      border: 1px solid rgba(245, 197, 24, 0.2);
  }

  .diff-hard {
      background: rgba(239, 68, 68, 0.1);
      color: #ef4444;
      border: 1px solid rgba(239, 68, 68, 0.2);
  }

  .qd-toggle-icon {
      width: 28px;
      height: 28px;
      border-radius: 8px;
      flex-shrink: 0;
      display: flex;
      align-items: center;
      justify-content: center;
      background: var(--bg3);
      color: var(--text3);
      transition: var(--transition);
  }

  .qd-qa-card.open .qd-toggle-icon {
      background: rgba(249, 115, 22, 0.1);
      color: var(--accent);
      transform: rotate(180deg);
  }

  .qd-qa-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s var(--ease-out), padding 0.3s;
      border-top: 0px solid var(--border);
  }

  .qd-qa-card.open .qd-qa-answer {
      max-height: 600px;
      border-top: 1px solid var(--border);
  }

  .qd-qa-answer-inner {
      padding: 20px 24px 20px 72px;
  }

  .qd-answer-text {
      font-size: 0.95rem;
      color: var(--text2);
      line-height: 1.8;
  }

  .qd-code-block {
      background: var(--code-bg, #0d0d16);
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 16px 20px;
      margin: 12px 0;
      font-family: 'JetBrains Mono', 'Fira Code', monospace;
      font-size: 13px;
      color: #e2e8f0;
      overflow-x: auto;
      line-height: 1.7;
  }

  [data-theme="light"] .qd-code-block {
      background: #1e1e2e;
      color: #cdd6f4;
  }

  .code-keyword {
      color: #c792ea;
  }

  .code-fn {
      color: #82aaff;
  }

  .code-str {
      color: #c3e88d;
  }

  .code-comment {
      color: #546e7a;
      font-style: italic;
  }

  .code-num {
      color: #f78c6c;
  }

  .qd-answer-tip {
      display: flex;
      gap: 10px;
      align-items: flex-start;
      background: rgba(249, 115, 22, 0.06);
      border: 1px solid rgba(249, 115, 22, 0.15);
      border-radius: var(--radius-md);
      padding: 12px 16px;
      margin-top: 12px;
  }

  .qd-answer-tip-icon {
      font-size: 1rem;
      flex-shrink: 0;
      margin-top: 2px;
  }

  .qd-answer-tip-text {
      font-size: 13px;
      color: var(--text2);
      line-height: 1.6;
  }

  .qd-answer-tip-text strong {
      color: var(--accent);
  }

  /* ── PROGRESS TRACKER ── */
  .qd-progress-tracker {
      position: fixed;
      right: 24px;
      top: 50%;
      transform: translateY(-50%);
      display: flex;
      flex-direction: column;
      gap: 4px;
      z-index: 40;
  }

  .qd-tracker-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--border);
      transition: var(--transition);
      cursor: pointer;
  }

  .qd-tracker-dot.done {
      background: var(--accent);
  }

  .qd-tracker-dot.active {
      background: var(--accent);
      transform: scale(1.5);
  }

  /* ── STATS BAR ── */
  .qd-stats-bar {
      display: flex;
      align-items: center;
      gap: 0;
      background: var(--bg2);
      border: 1px solid var(--border);
      border-radius: var(--radius-xl);
      overflow: hidden;
      margin-bottom: 48px;
  }

  .qd-stat-item {
      flex: 1;
      padding: 24px;
      text-align: center;
      position: relative;
  }

  .qd-stat-item:not(:last-child)::after {
      content: '';
      position: absolute;
      right: 0;
      top: 20%;
      bottom: 20%;
      width: 1px;
      background: var(--border);
  }

  .qd-stat-num {
      font-family: var(--font-display);
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--text);
      display: block;
  }

  .qd-stat-lbl {
      font-size: 12px;
      color: var(--text3);
      text-transform: uppercase;
      letter-spacing: 0.08em;
      margin-top: 2px;
  }

  /* ── CTA BANNER ── */
  .cta-banner {
      border-radius: var(--radius-xl);
      overflow: hidden;
      position: relative;
      background: linear-gradient(135deg, #f97316 0%, #ec4899 50%, #a855f7 100%);
      padding: 70px 60px;
      text-align: center;
  }

  .cta-banner::before {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(ellipse at 30% 50%, rgba(255, 255, 255, .15), transparent 60%);
      pointer-events: none;
  }

  .cta-content {
      position: relative;
      z-index: 1;
  }

  .cta-title {
      font-family: var(--font-display);
      font-size: clamp(1.8rem, 4vw, 2.8rem);
      font-weight: 700;
      color: #fff;
      margin-bottom: 14px;
  }

  .cta-sub {
      font-size: 1.05rem;
      color: rgba(255, 255, 255, .85);
      margin-bottom: 32px;
      line-height: 1.7;
  }

  .cta-form {
      display: flex;
      gap: 12px;
      max-width: 480px;
      margin: 0 auto;
  }

  .cta-input {
      flex: 1;
      padding: 14px 20px;
      border-radius: var(--radius-lg);
      background: rgba(255, 255, 255, .15);
      border: 1px solid rgba(255, 255, 255, .3);
      color: #fff;
      font-family: var(--font-body);
      font-size: 15px;
      backdrop-filter: blur(10px);
  }

  .cta-input::placeholder {
      color: rgba(255, 255, 255, .6);
  }

  .cta-input:focus {
      outline: none;
      border-color: rgba(255, 255, 255, .6);
  }

  .cta-btn {
      padding: 14px 28px;
      border-radius: var(--radius-lg);
      background: #fff;
      color: #f97316;
      font-family: var(--font-display);
      font-size: 15px;
      font-weight: 700;
      border: none;
      cursor: pointer;
      transition: var(--transition);
      white-space: nowrap;
  }

  .cta-btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 24px rgba(0, 0, 0, .2);
  }

  /* ── FOOTER ── */
  footer {
      border-top: 1px solid var(--border);
  }

  .footer-top {
      padding: 70px 0 50px;
  }

  .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr 1.5fr;
      gap: 40px;
  }

  .footer-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      margin-bottom: 16px;
  }

  .footer-desc {
      font-size: 14px;
      color: var(--text3);
      line-height: 1.7;
      margin-bottom: 20px;
  }

  .footer-socials {
      display: flex;
      gap: 10px;
  }

  .footer-social {
      width: 36px;
      height: 36px;
      border-radius: 10px;
      border: 1px solid var(--border);
      background: var(--bg-glass);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--text3);
      transition: var(--transition);
  }

  .footer-social:hover {
      border-color: var(--border-h);
      color: var(--accent);
  }

  .footer-col-title {
      font-family: var(--font-display);
      font-size: 14px;
      font-weight: 700;
      color: var(--text);
      margin-bottom: 16px;
  }

  .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
  }

  .footer-links a {
      font-size: 14px;
      color: var(--text3);
      transition: color 0.2s;
  }

  .footer-links a:hover {
      color: var(--text);
  }

  .footer-nl-sub {
      font-size: 13px;
      color: var(--text3);
      margin-bottom: 14px;
      line-height: 1.6;
  }

  .footer-nl-form {
      display: flex;
      gap: 8px;
      margin-bottom: 16px;
  }

  .footer-nl-input {
      flex: 1;
      padding: 10px 14px;
      border-radius: var(--radius-md);
      background: var(--bg3);
      border: 1px solid var(--border);
      color: var(--text);
      font-family: var(--font-body);
      font-size: 13px;
  }

  .footer-nl-input:focus {
      outline: none;
      border-color: var(--border-h);
  }

  .footer-nl-btn {
      padding: 10px 14px;
      border-radius: var(--radius-md);
      background: var(--accent);
      color: #fff;
      border: none;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: var(--transition);
  }

  .footer-nl-btn:hover {
      opacity: 0.85;
      transform: translateY(-1px);
  }

  .footer-bottom {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 24px 0;
      border-top: 1px solid var(--border);
      font-size: 13px;
      flex-wrap: wrap;
      gap: 10px;
  }

  /* Badge pills */
  .badge-pill {
      display: inline-flex;
      align-items: center;
      gap: 5px;
      padding: 4px 12px;
      border-radius: 999px;
      font-size: 12px;
      font-weight: 600;
  }

  .tag-orange {
      background: rgba(249, 115, 22, 0.1);
      color: var(--accent);
      border: 1px solid rgba(249, 115, 22, 0.2);
  }

  .tag-yellow {
      background: rgba(245, 197, 24, 0.1);
      color: #f5c518;
      border: 1px solid rgba(245, 197, 24, 0.2);
  }

  /* Related Resources */
  .qd-related-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
  }

  .qd-related-card {
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      overflow: hidden;
      transition: var(--transition);
      text-decoration: none;
      color: inherit;
  }

  .qd-related-card:hover {
      border-color: var(--border-h);
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
  }

  .qd-related-thumb {
      height: 100px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 3rem;
  }

  .qd-related-body {
      padding: 16px;
  }

  .qd-related-cat {
      font-size: 10px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.1em;
      color: var(--accent);
      margin-bottom: 6px;
  }

  .qd-related-title {
      font-family: var(--font-display);
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--text);
      margin-bottom: 8px;
      line-height: 1.35;
  }

  .qd-related-meta {
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-size: 11px;
      color: var(--text3);
  }

  .qd-dl-link {
      font-size: 12px;
      color: var(--accent);
      font-weight: 600;
  }

  /* Responsive */
  @media (max-width:1024px) {
      .qd-hero-inner {
          grid-template-columns: 1fr;
      }

      .qd-sidebar-card {
          position: static;
      }

      .footer-grid {
          grid-template-columns: 1fr 1fr;
      }

      .qd-related-grid {
          grid-template-columns: 1fr 1fr;
      }

      .qd-progress-tracker {
          display: none;
      }
  }

  @media (max-width:768px) {
      .nav-links {
          display: none;
      }

      .hamburger {
          display: flex;
      }

      .mobile-menu.open {
          display: flex;
      }

      .qd-hero {
          padding: 120px 0 60px;
      }

      .qd-stats-bar {
          flex-direction: column;
          gap: 0;
      }

      .qd-stat-item:not(:last-child)::after {
          width: 80%;
          height: 1px;
          top: auto;
          bottom: 0;
          right: 10%;
          left: 10%;
      }

      .cta-form {
          flex-direction: column;
      }

      .footer-grid {
          grid-template-columns: 1fr;
      }

      .qd-related-grid {
          grid-template-columns: 1fr;
      }

      .qd-qa-answer-inner {
          padding: 20px 24px;
      }
  }