:root{
            --primary: #2563eb;
            --primary-soft: #eff6ff;
            --primary-hover: #1d4ed8;
            --accent-yellow: #facc15;
            --text-main: #0f172a;
            --text-muted: #1a1b1d;
            --bg-page: #f9fafb;
            --bg-hero: #f8f5ef;
            --border: #e5e7eb;
            --sidebar-width: 280px;
            --radius-lg: 20px;
            --shadow-soft: 0 14px 30px rgba(15, 23, 42, 0.12);
            --fs-md: 1.1rem;
            --fs-base: 1.5rem;
            --fs-sm: 1.2rem;
            --fs-xs: 0.82rem;
            --fs-tiny: 0.75rem;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            margin: 0;
            font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
            color: var(--text-main);
            background: #ffffff;
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: 0.2s;
        }

        img {
            max-width: 100%;
            display: block;
        }

        h1,
        h2,
        h3,
        h4 {
            margin: 0;
            font-weight: 700;
            line-height: 1.25;
        }

        p {
            margin: 0 0 22px;
            font-size: var(--fs-sm);
            color: #374151;
        }

        ul {
            margin: 0;
            padding: 0;
            list-style: none;
        }

  
        .header-inner {
            max-width: 1200px;
            margin: 0 auto;
            padding: 12px 20px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 18px;
        }

        .brand-logo {
            font-size: 20px;
            font-weight: 800;
            color: var(--primary);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .brand-logo span {
            color: var(--text-main);
        }

        .nav-menu {
            display: flex;
            gap: 22px;
            font-size: 14px;
        }

        .nav-menu a {
            color: var(--text-muted);
            font-weight: 500;
            position: relative;
        }

        .nav-menu a:hover {
            color: var(--primary);
        }

        .nav-menu a::after {
            content: "";
            position: absolute;
            left: 0;
            bottom: -4px;
            width: 0;
            height: 2px;
            background: var(--primary);
            transition: width 0.18s ease;
        }

        .nav-menu a:hover::after {
            width: 100%;
        }

        .header-cta {
            background: var(--text-main);
            color: #fff;
            padding: 7px 16px;
            border-radius: 999px;
            font-size: 13px;
            font-weight: 600;
            border: none;
            cursor: pointer;
        }

        .hero {
            background: var(--bg-hero);
            border-bottom: 1px solid #f3f4f6;
        }

        .hero-inner {
            max-width: 1200px;
            margin: 0 auto;
            padding: 40px 20px 46px;
            display: grid;
            grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
            gap: 40px;
            align-items: center;
        }

        .hero-left {
            max-width: 640px;
        }

        .hero-tags {
            display: flex;
            gap: 10px;
            margin-bottom: 18px;
        }

        .hero-pill {
            padding: 6px 14px;
            border-radius: 999px;
            font-size: 13px;
            font-weight: 700;
        }

        .hero-pill.purple {
            background: #ede9ff;
            color: #6b21a8;
        }

        .hero-pill.yellow {
            background: #fef3c7;
            color: #92400e;
        }

        .hero-title {
            font-size: 46px;
            letter-spacing: -0.03em;
            margin-bottom: 18px;
        }

        .hero-meta-row {
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 22px;
            margin-top: 20px;
            font-size: 14px;
            color: var(--text-muted);
            flex-wrap: wrap;
        }

        .hero-meta-left {
            display: flex;
            flex-direction: column;
            gap: 4px;
        }

        .hero-meta-bottom {
            display: flex;
            align-items: center;
            gap: 14px;
            flex-wrap: wrap;
        }

        .meta-authors {
            display: flex;
            gap: 18px;
        }

        .author {
            display: flex;
            align-items: center;
            gap: 9px;
        }

        .author img {
            width: 40px;
            height: 40px;
            border-radius: 999px;
        }

        .author small {
            font-size: 11px;
            color: #9ca3af;
        }

        .author strong {
            font-size: 13px;
        }

        .share-btn {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            border-radius: 999px;
            border: 1px solid var(--border);
            padding: 7px 12px;
            background: #ffffff;
            cursor: pointer;
            font-size: 13px;
            color: var(--text-muted);
        }

        .share-btn i {
            font-size: 14px;
        }

        .hero-right {
            position: relative;
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .hero-art-wrapper {
            position: relative;
            width: 100%;
            max-width: 420px;
            overflow: visible;
        }

        .hero-art-bg {
            position: absolute;
            inset: -20px -10px -16px;
            background:
                radial-gradient(circle at 10% 20%, rgba(96, 165, 250, 0.3), transparent 55%),
                radial-gradient(circle at 90% 80%, rgba(244, 114, 182, 0.32), transparent 55%),
                #fef9c3;
            border-radius: 30px;
            opacity: 0.7;
        }

        .hero-art-card {
            position: relative;
            border-radius: 26px;
            padding: 18px;
            background: #fefefe;
            box-shadow: var(--shadow-soft);
            overflow: hidden;
            z-index: 1;
        }

        .hero-art-card img {
            border-radius: 16px;
        }

        .hero-sticker-top {
            position: absolute;
            top: 10px;
            left: 16px;
            background: #fff;
            padding: 6px 12px;
            border-radius: 999px;
            font-size: 12px;
            font-weight: 600;
            box-shadow: 0 10px 24px rgba(15, 23, 42, 0.16);
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .hero-sticker-bottom {
            position: absolute;
            bottom: 12px;
            right: 20px;
            background: #111827;
            color: #fff;
            padding: 6px 12px;
            border-radius: 999px;
            font-size: 11px;
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 4px;
            box-shadow: 0 10px 24px rgba(15, 23, 42, 0.4);
        }

        .float {
            animation: float 6s ease-in-out infinite;
        }

        @keyframes float {
            0% {
                transform: translateY(0);
            }

            50% {
                transform: translateY(-8px);
            }

            100% {
                transform: translateY(0);
            }
        }

        .main-shell {
            max-width: 1200px;
            margin: 32px auto 72px;
            padding: 0 20px;
            display: grid;
            grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
            gap: 56px;
        }

        /* SIDEBAR (DESKTOP) */
        aside.sidebar {
            position: sticky;
            top: 120px;
            height: fit-content;
            max-height: calc(100vh - 140px);
            padding-right: 8px;
            overflow-y: auto;
        }

        aside.sidebar::-webkit-scrollbar {
            width: 4px;
        }

        aside.sidebar::-webkit-scrollbar-thumb {
            background: #e5e7eb;
            border-radius: 999px;
        }

        .jump-label {
            font-size: 11px;
            text-transform: uppercase;
            letter-spacing: 0.08em;
            color: #9ca3af;
            font-weight: 700;
            margin-bottom: 12px;
            display: block;
        }

        .toc-list {
            border-left: 2px solid #f3f4f6;
            padding-left: 12px;
            display: flex;
            flex-direction: column;
            gap: 0;
        }

        .toc-link {
            display: block;
            padding: 7px 0 7px 12px;
            margin-left: -12px;
            border-left: 2px solid transparent;
            font-size: 14px;
            color: var(--text-muted);
            transition: all 0.18s ease;
        }

        .toc-link:hover {
            color: var(--primary);
            transform: translateX(2px);
        }

        .toc-link.active {
            color: var(--primary);
            font-weight: 600;
            border-left-color: var(--primary);
            background: linear-gradient(90deg, #f0f9ff 0%, transparent 60%);
        }

        .sidebar-ad {
            margin-top: 34px;
            background: linear-gradient(135deg, #3b82f6, #1d4ed8);
            border-radius: 18px;
            padding: 20px 18px 18px;
            color: #fff;
            box-shadow: 0 12px 30px rgba(37, 99, 235, 0.35);
            position: relative;
            overflow: hidden;
        }

        .sidebar-ad::before {
            content: "";
            position: absolute;
            width: 140px;
            height: 140px;
            background: radial-gradient(circle, rgba(239, 246, 255, 0.4), transparent 70%);
            top: -40px;
            right: -40px;
        }

        .sidebar-ad h3 {
            font-size: 17px;
            margin-bottom: 6px;
        }

        .sidebar-ad p {
            font-size: 13px;
            margin-bottom: 14px;
            color: #e5e7eb;
        }

        .ad-btn {
            border-radius: 999px;
            background: #111827;
            color: #fff;
            border: none;
            padding: 8px 16px;
            font-size: 13px;
            font-weight: 600;
            cursor: pointer;
            box-shadow: 0 10px 20px rgba(15, 23, 42, 0.45);
        }

        .sidebar-ad img {
            width: 85%;
            margin-top: 14px;
            border-radius: 14px;
            position: relative;
            z-index: 1;
        }

        .article-content {
            min-width: 0;
            font-size: 16px;
        }

        section {
            margin-bottom: 60px;
            scroll-margin-top: 130px;
        }

        .section-lead {
            font-size: var(--fs-base);
            font-weight: 500;
            margin-bottom: 14px;
            color: var(--text-main);
        }

        h2.section-title {
            font-size: 28px;
            color: #111827;
            margin-bottom: 12px;
        }

        h3 {
            font-size: 20px;
            margin: 20px 0 8px;
            color: #111827;
        }

        .key-takeaways {
            margin: 30px 0 10px;
            border-left: 4px solid var(--primary);
            padding-left: 20px;
        }

        .key-takeaways h4 {
            font-size: 16px;
            color: var(--primary);
            margin-bottom: 8px;
        }

        .info-box {
            margin: 22px 0;
            padding: 18px 18px 16px;
            border-radius: 12px;
            background: #eff6ff;
            border: 1px solid #dbeafe;
            display: flex;
            gap: 12px;
        }

        .info-box i {
            font-size: 18px;
            color: var(--primary);
            margin-top: 2px;
        }

        .info-box strong {
            display: block;
            font-size: 14px;
            margin-bottom: 4px;
        }

        .info-box p {
            margin-bottom: 0;
            font-size: 14px;
        }

        .info-box a {
            color: var(--primary);
            text-decoration: underline;
            font-weight: 500;
        }

        .arrow-list {
            list-style: none;
            padding: 0;
            margin: 0 0 12px;
        }

        .arrow-list li {
            position: relative;
            padding-left: 22px;
            margin-bottom: 10px;
            font-size: 16px;
        }

        .arrow-list li::before {
            content: "➜";
            position: absolute;
            left: 0;
            top: 1px;
            color: var(--primary);
            font-size: 13px;
            font-weight: 700;
        }

        .number-block {
            display: flex;
            gap: 16px;
            margin-bottom: 22px;
        }

        .num {
            font-size: 26px;
            font-weight: 800;
            color: #234fa6;
            min-width: 28px;
        }

        .num-content h3 {
            margin-top: 0;
        }

        figure {
            margin: 30px 0 6px;
        }

        figure img {
            width: 100%;
            border-radius: 16px;
            box-shadow: 0 10px 26px rgba(15, 23, 42, 0.12);
        }

        figcaption {
            text-align: left;
            font-size: 12px;
            color: #6b7280;
            margin-top: 8px;
        }

        .mobile-toc {
            display: none;
            margin-bottom: 22px;
        }

        .mobile-toc-toggle {
            width: 100%;
            border-radius: 999px;
            border: 1px solid var(--border);
            background: #ffffff;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 9px 14px;
            font-size: 14px;
            cursor: pointer;
            font-weight: 500;
            color: var(--text-muted);
        }

        .mobile-toc-panel {
            margin-top: 10px;
            border-radius: 16px;
            border: 1px solid #e5e7eb;
            background: #ffffff;
            box-shadow: 0 16px 30px rgba(15, 23, 42, 0.12);
            padding: 10px 0;
            display: none;
            overflow: hidden;
        }

        .mobile-toc-panel.open {
            display: block;
        }

        .mobile-toc-panel a {
            display: block;
            padding: 8px 16px;
            font-size: 14px;
            color: var(--text-muted);
        }

        .mobile-toc-panel a:hover {
            background: #f9fafb;
            color: var(--primary);
        }

        .related-section {
            margin-top: 10px;
        }

        .related-heading-row {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 14px;
            gap: 12px;
        }

        .related-heading-row h2 {
            font-size: 22px;
        }

        .related-heading-row a {
            font-size: 13px;
            color: var(--primary);
            font-weight: 600;
        }

        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, minmax(0, 1fr));
            gap: 18px;
        }




.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: 0.6s ease;
}

.reveal.active {
  opacity: 1;
  transform: none;
}
        .reveal.visible {
            opacity: 1;
            transform: none;
        }


/* =========================================
   HERO SECTION
   ========================================= */

.dp-hero {
  background: radial-gradient(circle at top left, #2563eb 0, #0b1f3b 55%, #020617 100%);
  color: var(--clr-white);
  padding: var(--sp-7) 0 var(--sp-8);
}

.dp-hero-inner {
  width: var(--container);
  max-width: 980px;
  margin: 0 auto;
}

.dp-eyebrow {
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  opacity: 0.9;
}

.dp-hero h1 {
  font-size: var(--fs-hero);
  font-weight: var(--fw-bold);
  line-height: 1.18;
  margin-top: var(--sp-2);
}

.dp-hero-sub {
  margin-top: var(--sp-3);
  font-size: var(--fs-md);
  max-width: 46rem;
  color: #e5edff;
}

.dp-hero-meta {
  margin-top: var(--sp-3);
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3);
  font-size: var(--fs-sm);
  opacity: 0.95;
}

.dp-hero-meta span::before {
  content: "• ";
  opacity: 0.7;
}
.dp-hero-meta span:first-child::before {
  content: "";
}



/* =========================================
   MAIN LAYOUT
   ========================================= */

.dp-layout {
  width: var(--container);
  max-width: var(--max-width);
  margin: var(--sp-7) auto var(--sp-8);
  display: flex;
  align-items: flex-start;
  gap: var(--sp-5);
}

/* ---------- SIDEBAR ---------- */

.dp-sidebar {
  width: 260px;
  background: var(--clr-white);
  border-radius: var(--radius-lg);
  border: 1px solid var(--clr-border);
  padding: var(--sp-4);
  position: sticky;
  top: var(--sp-7);
  align-self: flex-start;
  box-shadow: var(--shadow-soft);
}

.dp-sidebar h3 {
  font-size: var(--fs-md);
  font-weight: var(--fw-semibold);
  color: var(--clr-heading);
  margin-bottom: var(--sp-2);
}

.dp-sidebar ul {
  list-style: none;
}

.dp-sidebar li + li {
  margin-top: 4px;
}

.dp-sidebar a {
  display: block;
  padding: 8px 10px;
  border-radius: var(--radius-md);
  font-size: var(--fs-sm);
  text-decoration: none;
  color: var(--clr-text-muted);
  transition: background 0.18s ease, color 0.18s ease, transform 0.12s ease;
}

.dp-sidebar a:hover {
  background: var(--clr-primary-soft);
  color: var(--clr-heading);
  transform: translateX(2px);
}

.dp-sidebar a.active {
  background: var(--clr-primary-soft);
  color: var(--clr-primary);
  font-weight: var(--fw-semibold);
}

/* ---------- CONTENT ---------- */

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

/* =========================================
   CONTENT SECTIONS
   ========================================= */

.dp-section {
  background: var(--clr-card-bg);
  border-radius: var(--radius-xl);
  border: 1px solid var(--clr-border);
  padding: var(--sp-6) var(--sp-6);
  margin-bottom: var(--sp-5);
  box-shadow: var(--shadow-soft);
}

.dp-section h2 {
  font-size: var(--fs-2xl);
  color: var(--clr-heading);
  font-weight: var(--fw-bold);
  margin-bottom: var(--sp-2);
}

.dp-section p {
  font-size: var(--fs-base);
  color: var(--clr-text-muted);
  margin-bottom: var(--sp-2);
}

.dp-section p:last-child {
  margin-bottom: 0;
}

.dp-section ul,
.dp-section ol {
  margin-top: var(--sp-2);
  margin-left: 1.2rem;
  color: var(--clr-text-muted);
  font-size: var(--fs-base);
}

.dp-section li + li {
  margin-top: 4px;
}

/* Feature / content images */

.dp-img {
  width: 100%;
  border-radius: var(--radius-lg);
  margin: var(--sp-4) 0 var(--sp-3);
  display: block;
}

/* =========================================
   SUMMARY CARDS
   ========================================= */

.dp-summary-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--sp-4);
  margin-top: var(--sp-3);
}

.dp-summary-card {
  border-radius: var(--radius-lg);
  padding: var(--sp-4);
  background: var(--clr-card-bg-soft);
  border: 1px solid #d6e2ff;
}

.dp-summary-card h3 {
  font-size: var(--fs-lg);
  font-weight: var(--fw-semibold);
  color: var(--clr-heading);
  margin-bottom: var(--sp-2);
}

.dp-summary-card ul {
  margin-left: 1.1rem;
  margin-top: 0;
}

/* =========================================
   GRID LAYOUTS (2 & 3 column)
   ========================================= */

.dp-two-col {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--sp-4);
  margin-top: var(--sp-3);
}

.dp-three-col {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--sp-4);
  margin-top: var(--sp-3);
}

.dp-two-col h3,
.dp-three-col h3 {
  font-size: var(--fs-md);
  font-weight: var(--fw-semibold);
  color: var(--clr-heading);
  margin-bottom: var(--sp-1);
}

/* =========================================
   TABLE
   ========================================= */

.dp-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: var(--sp-3);
  font-size: var(--fs-sm);
}

.dp-table th,
.dp-table td {
  padding: 12px 14px;
  border: 1px solid var(--clr-border);
  vertical-align: top;
}

.dp-table th {
  background: #edf2ff;
  font-weight: var(--fw-semibold);
  text-align: left;
  color: var(--clr-heading);
}

.dp-table tbody tr:nth-child(even) {
  background: #f8f9ff;
}

/* =========================================
   FAQ ACCORDION
   ========================================= */

.dp-faq {
  margin-top: var(--sp-3);
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}

.dp-faq-item {
  background: var(--clr-white);
  border-radius: var(--radius-lg);
  border: 1px solid var(--clr-border);
  overflow: hidden;
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.dp-faq-item.open {
  box-shadow: var(--shadow-medium);
  border-color: #c3d5ff;
}

.dp-faq-question {
  width: 100%;
  background: none;
  border: none;
  outline: none;
  padding: var(--sp-3) var(--sp-4);
  font-size: var(--fs-md);
  font-weight: var(--fw-semibold);
  color: var(--clr-heading);
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  text-align: left;
}

.dp-faq-arrow {
  display: inline-block;
  transition: transform 0.25s ease;
  font-size: var(--fs-md);
  color: var(--clr-primary);
}

.dp-faq-item.open .dp-faq-arrow {
  transform: rotate(90deg);
}

.dp-faq-answer {
  max-height: 0;
  overflow: hidden;
  background: var(--clr-card-bg-soft);
  padding: 0 var(--sp-4);
  transition: max-height 0.28s ease-out, padding 0.2s ease;
}

.dp-faq-item.open .dp-faq-answer {
  padding: var(--sp-2) var(--sp-4) var(--sp-3);
  max-height: 300px; /* enough for content */
}

.dp-faq-answer p {
  font-size: var(--fs-sm);
  color: var(--clr-text-muted);
}

/* =========================================
   VERDICT / CTA
   ========================================= */

.dp-verdict {
  border: 1px solid var(--clr-verdict-border);
  background: var(--clr-verdict-bg);
}

.dp-cta-btn {
  margin-top: var(--sp-3);
  display: inline-block;
  padding: 11px 22px;
  border-radius: 999px;
  background: var(--clr-primary);
  color: var(--clr-white);
  font-size: var(--fs-sm);
  text-decoration: none;
  font-weight: var(--fw-semibold);
  box-shadow: 0 10px 20px rgba(37, 99, 235, 0.3);
  transition: transform 0.12s ease, box-shadow 0.12s ease, background 0.12s ease;
}

.dp-cta-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 14px 26px rgba(37, 99, 235, 0.35);
  background: var(--clr-primary-hover);
}

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

@media (max-width: 1100px) {
  .dp-layout {
    flex-direction: column;
  }

  .dp-sidebar {
    position: static;
    width: 100%;
    order: -1;
  }
}


        @media (max-width: 960px) {
            .nav-menu {
                display: none;
            }

            .hero-inner {
                grid-template-columns: 1fr;
                padding: 30px 18px 32px;
            }

            .hero-right {
                order: -1;
            }

            .hero-title {
                font-size: 34px;
            }

            .hero-meta-row {
                flex-direction: column;
                align-items: flex-start;
            }

            .main-shell {
                grid-template-columns: 1fr;
                gap: 32px;
                margin-top: 26px;
            }

            aside.sidebar {
                display: none;
            }

            .mobile-toc {
                display: block;
          }

            .related-grid {
                grid-template-columns: minmax(0, 1fr);
            }
        }

        @media (min-width: 961px) and (max-width: 1120px) {
            .hero-title {
                font-size: 40px;
            }

            .related-grid {
                grid-template-columns: repeat(2, minmax(0, 1fr));
            }
        }

@media (max-width: 900px) {
  .dp-hero {
    padding: var(--sp-6) 0 var(--sp-7);
  }

  .dp-hero-inner {
    width: var(--container);
  }

  .dp-hero h1 {
    font-size: 2.1rem;
  }

  .dp-layout {
    width: var(--container);
    margin-top: var(--sp-6);
  }

  .dp-section {
    padding: var(--sp-5) var(--sp-4);
  }

  .dp-two-col {
    grid-template-columns: 1fr;
  }

  .dp-three-col {
    grid-template-columns: 1fr;
  }

  .dp-summary-grid {
    grid-template-columns: 1fr;
  }
}


@media (max-width: 600px) {
  .dp-hero-inner {
    width: 94%;
  }

  .dp-layout {
    width: 94%;
  }

  .dp-hero-meta {
    flex-direction: column;
    gap: 4px;
  }

  .dp-section {
    padding: var(--sp-4) var(--sp-3);
  }

  .dp-sidebar {
    padding: var(--sp-3);
  }
}