* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        :root {
            --primary: #1a1a2e;
            --secondary: #16213e;
            --accent: #0f3460;
            --highlight: #e94560;
            --success: #00d9ff;
            --warning: #ffd32d;
            --bg-dark: #0f0f1e;
            --card-bg: #1a1a2e;
            --text: #ffffff;
            --text-light: #a0a0a0;
            --gradient-1: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            --gradient-2: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
            --gradient-3: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: var(--bg-dark);
            color: var(--text);
            line-height: 1.6;
            min-height: 100vh;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 20px;
        }

        /* Header */
        header {
            background: var(--card-bg);
            padding: 30px 0;
            text-align: center;
            border-radius: 20px;
            margin-bottom: 30px;
            box-shadow: 0 10px 40px rgba(233, 69, 96, 0.2);
            border: 1px solid rgba(233, 69, 96, 0.1);
        }

        header h1 {
            font-size: 2.5em;
            background: var(--gradient-2);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-bottom: 10px;
        }

        header .subtitle {
            font-size: 1.2em;
            color: var(--text-light);
        }

        header .emoji {
            font-size: 3em;
            margin-bottom: 10px;
        }

        /* Navigation */
        nav {
            background: var(--card-bg);
            padding: 15px;
            border-radius: 15px;
            margin-bottom: 30px;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
            position: sticky;
            /* Fica fixo logo abaixo da barra de "Parte 1 / Parte 2" */
            top: calc(var(--part-switch-h, 0px) + 12px);
            z-index: 900;
            border: 1px solid rgba(0, 217, 255, 0.2);
        }

        .nav-toggle {
            display: none;
            background: var(--highlight);
            color: white;
            border: none;
            padding: 10px 20px;
            border-radius: 8px;
            cursor: pointer;
            font-size: 1em;
            font-weight: 600;
            width: 100%;
            text-align: center;
        }

        nav ul {
            display: flex;
            justify-content: center;
            gap: 15px;
            flex-wrap: wrap;
            list-style: none;
        }

        nav a {
            color: var(--text);
            text-decoration: none;
            padding: 10px 20px;
            border-radius: 8px;
            transition: all 0.3s ease;
            font-weight: 500;
            border: 1px solid transparent;
        }

        nav a:hover {
            background: var(--highlight);
            color: white;
            transform: translateY(-2px);
            border-color: var(--highlight);
        }

        /* Cards */
        .card {
            background: var(--card-bg);
            border-radius: 15px;
            padding: 30px;
            margin-bottom: 30px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            border: 1px solid rgba(0, 217, 255, 0.1);
        }

        .card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 30px rgba(233, 69, 96, 0.3);
        }

        .card h2 {
            background: var(--gradient-3);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            font-size: 2em;
            margin-bottom: 20px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .card h3 {
            color: var(--success);
            margin: 20px 0 10px;
            font-size: 1.4em;
        }

        /* Stats Grid */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
            margin: 20px 0;
        }

        .stat-card {
            background: linear-gradient(135deg, var(--accent), var(--secondary));
            color: white;
            padding: 25px;
            border-radius: 12px;
            text-align: center;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
            transition: transform 0.3s ease;
            border: 1px solid rgba(0, 217, 255, 0.2);
        }

        .stat-card:hover {
            transform: scale(1.05);
            box-shadow: 0 6px 25px rgba(233, 69, 96, 0.4);
        }

        .stat-card .emoji {
            font-size: 2.5em;
            margin-bottom: 10px;
        }

        .stat-card .label {
            font-size: 0.9em;
            opacity: 0.9;
            margin-bottom: 5px;
        }

        .stat-card .value {
            font-size: 2em;
            font-weight: bold;
        }

        /* Model Comparison Table */
        .model-table {
            width: 100%;
            border-collapse: collapse;
            margin: 20px 0;
            overflow: hidden;
            border-radius: 12px;
            box-shadow: 0 2px 15px rgba(0, 0, 0, 0.3);
        }

        .model-table thead {
            background: linear-gradient(135deg, var(--accent), var(--secondary));
            color: white;
        }

        .model-table th,
        .model-table td {
            padding: 15px;
            text-align: left;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }

        .model-table tbody tr {
            background: var(--card-bg);
            transition: background 0.2s ease;
        }

        .model-table tbody tr:hover {
            background: var(--secondary);
        }

        .model-table .winner {
            background: linear-gradient(135deg, var(--highlight), #c23854);
            color: white;
            font-weight: bold;
        }

        .model-table .medal {
            font-size: 1.5em;
        }

        /* Progress Bar */
        .progress-bar {
            background: var(--secondary);
            height: 30px;
            border-radius: 15px;
            overflow: hidden;
            margin: 10px 0;
            position: relative;
            border: 1px solid rgba(0, 217, 255, 0.2);
        }

        .progress-fill {
            height: 100%;
            background: linear-gradient(90deg, var(--success), var(--highlight));
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-weight: bold;
            transition: width 1s ease;
        }

        /* Timeline */
        .timeline {
            position: relative;
            padding: 20px 0;
        }

        .timeline-item {
            position: relative;
            padding-left: 40px;
            margin-bottom: 30px;
        }

        .timeline-item::before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            width: 20px;
            height: 20px;
            background: var(--highlight);
            border-radius: 50%;
            border: 4px solid var(--card-bg);
            box-shadow: 0 0 0 4px var(--highlight);
        }

        .timeline-item::after {
            content: '';
            position: absolute;
            left: 9px;
            top: 20px;
            width: 2px;
            height: calc(100% + 10px);
            background: var(--success);
        }

        .timeline-item:last-child::after {
            display: none;
        }

        .timeline-content {
            background: var(--secondary);
            padding: 15px;
            border-radius: 8px;
            border: 1px solid rgba(0, 217, 255, 0.2);
        }

        /* Feature List */
        .feature-list {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 10px;
            margin: 20px 0;
        }

        .feature-item {
            background: var(--secondary);
            padding: 12px;
            border-radius: 8px;
            border-left: 4px solid var(--success);
            transition: all 0.3s ease;
        }

        .feature-item:hover {
            background: var(--accent);
            transform: translateX(5px);
            border-left-color: var(--highlight);
        }

        /* Insights Box */
        .insight-box {
            background: linear-gradient(135deg, var(--accent), var(--secondary));
            padding: 20px;
            border-radius: 12px;
            margin: 20px 0;
            border-left: 5px solid var(--warning);
            border: 1px solid rgba(255, 211, 45, 0.3);
        }

        .insight-box h4 {
            margin-bottom: 10px;
            color: var(--warning);
        }

        /* Alert Box */
        .alert {
            padding: 15px 20px;
            border-radius: 8px;
            margin: 15px 0;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .alert-success {
            background: linear-gradient(135deg, rgba(0, 217, 255, 0.2), rgba(0, 217, 255, 0.1));
            border-left: 4px solid var(--success);
            color: var(--text);
        }

        .alert-info {
            background: linear-gradient(135deg, rgba(233, 69, 96, 0.2), rgba(233, 69, 96, 0.1));
            border-left: 4px solid var(--highlight);
            color: var(--text);
        }

        /* Footer */
        footer {
            background: var(--card-bg);
            padding: 30px;
            border-radius: 15px;
            text-align: center;
            margin-top: 30px;
            box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.3);
            border: 1px solid rgba(0, 217, 255, 0.1);
        }

        footer p {
            color: var(--text-light);
            margin: 5px 0;
        }

        footer h3 {
            background: var(--gradient-2);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        /* Animations */
        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .card {
            animation: fadeIn 0.6s ease;
        }

        /* Button */
        .btn {
            display: inline-block;
            padding: 12px 30px;
            background: var(--highlight);
            color: white;
            text-decoration: none;
            border-radius: 8px;
            transition: all 0.3s ease;
            font-weight: 600;
            border: none;
            cursor: pointer;
        }

        .btn:hover {
            background: #c23854;
            transform: translateY(-2px);
            box-shadow: 0 4px 15px rgba(233, 69, 96, 0.4);
        }

        /* Code Block */
        .code-block {
            background: var(--secondary);
            color: var(--success);
            padding: 20px;
            border-radius: 8px;
            overflow-x: auto;
            margin: 15px 0;
            font-family: 'Courier New', monospace;
            border: 1px solid rgba(0, 217, 255, 0.2);
        }

        /* Responsive */
        @media (max-width: 768px) {
            header h1 {
                font-size: 1.8em;
            }

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

            .nav-toggle {
                display: block;
            }

            nav ul {
                display: none;
                flex-direction: column;
                margin-top: 15px;
            }

            nav ul.active {
                display: flex;
            }

            nav a {
                width: 100%;
                text-align: center;
            }

            .model-table {
                font-size: 0.9em;
            }

            .container {
                padding: 10px;
            }

            .card {
                padding: 20px;
            }

            nav {
                top: 10px;
            }
        }
    

/* --- Parte 1 extra styles --- */

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        :root {
            --primary: #1a1a2e;
            --secondary: #16213e;
            --accent: #0f3460;
            --highlight: #e94560;
            --success: #00d9ff;
            --warning: #ffd32d;
            --bg-dark: #0f0f1e;
            --card-bg: #1a1a2e;
            --text: #ffffff;
            --text-light: #a0a0a0;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: var(--bg-dark);
            color: var(--text);
            line-height: 1.6;
            min-height: 100vh;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 20px;
        }

        header {
            background: var(--card-bg);
            padding: 30px 0;
            text-align: center;
            border-radius: 20px;
            margin-bottom: 30px;
            box-shadow: 0 10px 40px rgba(233, 69, 96, 0.2);
            border: 1px solid rgba(233, 69, 96, 0.1);
        }

        header h1 {
            font-size: 2.5em;
            background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-bottom: 10px;
        }

        header .subtitle {
            font-size: 1.2em;
            color: var(--text-light);
        }

        header .part-badge {
            display: inline-block;
            background: var(--highlight);
            color: white;
            padding: 8px 20px;
            border-radius: 20px;
            font-weight: bold;
            margin-top: 15px;
            font-size: 0.9em;
        }

        nav {
            background: var(--card-bg);
            padding: 15px;
            border-radius: 15px;
            margin-bottom: 30px;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
            position: sticky;
            top: 20px;
            z-index: 100;
            border: 1px solid rgba(0, 217, 255, 0.2);
        }

        .nav-toggle {
            display: none;
            background: var(--highlight);
            color: white;
            border: none;
            padding: 10px 20px;
            border-radius: 8px;
            cursor: pointer;
            font-size: 1em;
            font-weight: 600;
            width: 100%;
        }

        nav ul {
            display: flex;
            justify-content: center;
            gap: 15px;
            flex-wrap: wrap;
            list-style: none;
        }

        nav a {
            color: var(--text);
            text-decoration: none;
            padding: 10px 20px;
            border-radius: 8px;
            transition: all 0.3s ease;
            font-weight: 500;
            border: 1px solid transparent;
        }

        nav a:hover {
            background: var(--highlight);
            color: white;
            border-color: var(--highlight);
        }

        .card {
            background: var(--card-bg);
            border-radius: 15px;
            padding: 30px;
            margin-bottom: 30px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
            border: 1px solid rgba(0, 217, 255, 0.1);
            animation: fadeIn 0.6s ease;
        }

        .card h2 {
            font-size: 2em;
            margin-bottom: 20px;
            display: flex;
            align-items: center;
            gap: 12px;
        }

            /* 🎨 gradiente APENAS no texto */
            .card h2 .title-text {
            background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

            /* 🎯 emoji com cor original */
            .card h2 .emoji {
            -webkit-text-fill-color: initial;
            color: initial;
        }

        .card h3 {
            color: var(--success);
            margin: 20px 0 10px;
            font-size: 1.4em;
        }

        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
            margin: 20px 0;
        }

        .stat-card {
            background: linear-gradient(135deg, var(--accent), var(--secondary));
            padding: 25px;
            border-radius: 12px;
            text-align: center;
            border: 1px solid rgba(0, 217, 255, 0.2);
            transition: transform 0.3s ease;
        }

        .stat-card:hover {
            transform: scale(1.05);
            box-shadow: 0 6px 25px rgba(233, 69, 96, 0.4);
        }

        .stat-card .emoji {
            font-size: 2.5em;
            margin-bottom: 10px;
        }

        .stat-card .label {
            font-size: 0.9em;
            opacity: 0.9;
            margin-bottom: 5px;
        }

        .stat-card .value {
            font-size: 2em;
            font-weight: bold;
        }

        .process-step {
            background: var(--secondary);
            padding: 20px;
            border-radius: 12px;
            margin: 15px 0;
            border-left: 4px solid var(--success);
            transition: all 0.3s ease;
        }

        .process-step:hover {
            transform: translateX(5px);
            border-left-color: var(--highlight);
        }

        .process-step h4 {
            color: var(--warning);
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .process-step ul {
            margin-left: 20px;
            margin-top: 10px;
        }

        .process-step li {
            margin: 5px 0;
            color: var(--text-light);
        }

        .code-block {
            background: var(--secondary);
            color: var(--success);
            padding: 20px;
            border-radius: 8px;
            overflow-x: auto;
            margin: 15px 0;
            font-family: 'Courier New', monospace;
            border: 1px solid rgba(0, 217, 255, 0.2);
            font-size: 0.9em;
        }

        .insight-box {
            background: linear-gradient(135deg, var(--accent), var(--secondary));
            padding: 20px;
            border-radius: 12px;
            margin: 20px 0;
            border-left: 5px solid var(--warning);
            border: 1px solid rgba(255, 211, 45, 0.3);
        }

        .insight-box h4 {
            color: var(--warning);
            margin-bottom: 10px;
        }

        .alert {
            padding: 15px 20px;
            border-radius: 8px;
            margin: 15px 0;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .alert-info {
            background: linear-gradient(135deg, rgba(233, 69, 96, 0.2), rgba(233, 69, 96, 0.1));
            border-left: 4px solid var(--highlight);
        }

        .alert-success {
            background: linear-gradient(135deg, rgba(0, 217, 255, 0.2), rgba(0, 217, 255, 0.1));
            border-left: 4px solid var(--success);
        }

        .data-table {
            width: 100%;
            border-collapse: collapse;
            margin: 20px 0;
            font-size: 0.9em;
        }

        .data-table thead {
            background: linear-gradient(135deg, var(--accent), var(--secondary));
        }

        .data-table th,
        .data-table td {
            padding: 12px;
            text-align: left;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }

        .data-table tbody tr {
            background: var(--card-bg);
            transition: background 0.2s ease;
        }

        .data-table tbody tr:hover {
            background: var(--secondary);
        }

        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 10px;
            margin: 20px 0;
        }

        .feature-item {
            background: var(--secondary);
            padding: 12px;
            border-radius: 8px;
            border-left: 4px solid var(--success);
            transition: all 0.3s ease;
        }

        .feature-item:hover {
            background: var(--accent);
            transform: translateX(5px);
            border-left-color: var(--highlight);
        }

        .timeline {
            position: relative;
            padding: 20px 0;
        }

        .timeline-item {
            position: relative;
            padding-left: 40px;
            margin-bottom: 30px;
        }

        .timeline-item::before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            width: 20px;
            height: 20px;
            background: var(--highlight);
            border-radius: 50%;
            border: 4px solid var(--card-bg);
            box-shadow: 0 0 0 4px var(--highlight);
        }

        .timeline-item::after {
            content: '';
            position: absolute;
            left: 9px;
            top: 20px;
            width: 2px;
            height: calc(100% + 10px);
            background: var(--success);
        }

        .timeline-item:last-child::after {
            display: none;
        }

        .timeline-content {
            background: var(--secondary);
            padding: 15px;
            border-radius: 8px;
            border: 1px solid rgba(0, 217, 255, 0.2);
        }

        .next-section {
            text-align: center;
            margin: 40px 0;
            padding: 30px;
            background: linear-gradient(135deg, var(--accent), var(--secondary));
            border-radius: 15px;
            border: 2px solid var(--highlight);
        }

        .next-section h3 {
            color: var(--warning);
            margin-bottom: 15px;
        }

        .btn {
            display: inline-block;
            padding: 12px 30px;
            background: var(--highlight);
            color: white;
            text-decoration: none;
            border-radius: 8px;
            transition: all 0.3s ease;
            font-weight: 600;
            border: none;
            cursor: pointer;
        }

        .btn:hover {
            background: #c23854;
            transform: translateY(-2px);
            box-shadow: 0 4px 15px rgba(233, 69, 96, 0.4);
        }

        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        @media (max-width: 768px) {
            header h1 {
                font-size: 1.8em;
            }

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

            .nav-toggle {
                display: block;
            }

            nav ul {
                display: none;
                flex-direction: column;
                margin-top: 15px;
            }

            nav ul.active {
                display: flex;
            }

            .container {
                padding: 10px;
            }

            .card {
                padding: 20px;
            }
        }
    

/* ===============
   Fix global text on dark theme
   =============== */
html, body {
  background: var(--bg-dark) !important;
  color: var(--text) !important;
}

/* Make sure common elements inherit white text */
body, p, span, div, li, td, th, label {
  color: inherit;
}

a { color: var(--text); }
a:visited { color: var(--text); }

/* tables */
.data-table, .model-table {
  color: var(--text);
}

/* ===============
   Part switcher
   =============== */
.part-switcher{
  position: sticky;
  top: 0;
  z-index: 1000;
  max-width: 1200px;
  margin: 0 auto;
  padding: 12px 20px 0;
}
.part-switcher-inner{
  background: var(--card-bg);
  border: 1px solid rgba(0, 217, 255, 0.2);
  border-radius: 15px;
  padding: 10px;
  display:flex;
  gap:10px;
  justify-content:center;
  box-shadow: 0 4px 15px rgba(0,0,0,0.3);
}

/* Quando navegar por âncoras, evita que os títulos fiquem escondidos sob as barras sticky */
.card[id]{
  scroll-margin-top: calc(var(--part-switch-h, 0px) + 90px);
}
.part-btn{
  flex:1;
  min-width: 180px;
  padding: 10px 14px;
  border-radius: 10px;
  border: 1px solid transparent;
  background: var(--secondary);
  color: var(--text);
  font-weight: 700;
  cursor:pointer;
  transition: all .2s ease;
}
.part-btn:hover{ transform: translateY(-1px); border-color: rgba(233, 69, 96, 0.6); }
.part-btn.active{ background: var(--highlight); border-color: var(--highlight); }

.part{ display:none; }
.part.active{ display:block; }

@media (max-width: 768px){
  .part-switcher-inner{ flex-direction: column; }
  .part-btn{ width:100%; }
}

/* ==========================================================
   Sticky NAV (ajuste final)
   O CSS original tem blocos duplicados (Parte 1 e Parte 2)
   que redefinem nav{top/z-index} e podem “quebrar” o sticky.
   Este bloco no final garante:
   - menu sempre preso abaixo do switcher Parte 1/2
   - z-index acima do conteúdo
   ========================================================== */

nav{
  position: sticky !important;
  top: calc(var(--part-switch-h, 0px) + 12px) !important;
  z-index: 980 !important;
}

@media (max-width: 768px){
  nav{
    top: calc(var(--part-switch-h, 0px) + 10px) !important;
  }
}