:root {
    --primary: #ff58ae;
    --primary-light: #ffc2e4;
    --primary-dark: #e2007a;
    --secondary: #5858ff;
    --dark: #333;
    --light: #f9f9f9;
    --gray: #e0e0e0;
    --success: #4caf50;
    --error: #f44336;
    --warning: #ff9800;
    --info: #2196f3;
    --border-radius: 8px;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--dark);
    background-color: var(--light);
    padding-top: 70px;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header e Navegação */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: white;
    box-shadow: var(--shadow);
    z-index: 1000;
    padding: 15px 0;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--dark);
}

nav ul {
    display: flex;
    list-style: none;
}

nav ul li {
    margin-left: 20px;
}

nav ul li a {
    text-decoration: none;
    color: var(--dark);
    font-weight: 500;
    transition: var(--transition);
    padding: 5px 10px;
    border-radius: var(--border-radius);
}

nav ul li a:hover, 
nav ul li a.active {
    background-color: var(--primary-light);
    color: var(--primary-dark);
}

/* Conteúdo Principal */
main {
    min-height: calc(100vh - 180px);
}

.page {
    display: none;
    padding: 30px 0;
}

.page.active {
    display: block;
}

/* Cards */
.cards-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin: 30px 0;
}

.card {
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    padding: 20px;
    transition: var(--transition);
    cursor: pointer;
    height: 100%;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.1);
}

.card h3 {
    color: var(--primary);
    margin-bottom: 10px;
}

.card-icon {
    font-size: 2rem;
    margin-bottom: 15px;
    color: var(--primary);
}

/* Títulos e Texto */
h1, h2, h3, h4 {
    margin-bottom: 15px;
    color: var(--dark);
}

h1 {
    font-size: 2.5rem;
    color: var(--primary);
}

h2 {
    font-size: 2rem;
    border-bottom: 2px solid var(--primary-light);
    padding-bottom: 10px;
    margin: 30px 0 20px;
}

h3 {
    font-size: 1.5rem;
    margin-top: 25px;
}

p {
    margin-bottom: 15px;
}

/* Blocos de Código */
.code-block {
    position: relative;
    background-color: #2d2d2d;
    color: #f8f8f2;
    border-radius: var(--border-radius);
    padding: 15px;
    margin: 20px 0;
    overflow-x: auto;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 0.9rem;
}

.copy-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    background-color: var(--primary);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    padding: 5px 10px;
    cursor: pointer;
    font-size: 0.8rem;
    transition: var(--transition);
}

.copy-btn:hover {
    background-color: var(--primary-dark);
}

.sql-keyword {
    color: #f92672;
}

.sql-string {
    color: #a6e22e;
}

.sql-number {
    color: #ae81ff;
}

.sql-comment {
    color: #75715e;
}

/* Tabelas */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    background-color: white;
    box-shadow: var(--shadow);
    border-radius: var(--border-radius);
    overflow: hidden;
}

th, td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid var(--gray);
}

th {
    background-color: var(--primary-light);
    color: var(--primary-dark);
    font-weight: 600;
}

tr:hover {
    background-color: rgba(255, 88, 174, 0.05);
}

/* Botões */
.btn {
    display: inline-block;
    background-color: var(--primary);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    padding: 10px 20px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    transition: var(--transition);
    text-align: center;
    text-decoration: none;
}

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

.btn-secondary {
    background-color: var(--secondary);
}

.btn-secondary:hover {
    background-color: #4040d0;
}

.btn-success {
    background-color: var(--success);
}

.btn-error {
    background-color: var(--error);
}

/* Playground */
#sql-editor {
    width: 100%;
    min-height: 150px;
    padding: 15px;
    border: 1px solid var(--gray);
    border-radius: var(--border-radius);
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 1rem;
    resize: vertical;
    margin-bottom: 15px;
}

.playground-controls {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.result-container {
    margin-top: 20px;
    overflow-x: auto;
}

/* Animações de JOIN */
.join-demo {
    margin: 30px 0;
    border: 1px solid var(--gray);
    border-radius: var(--border-radius);
    padding: 20px;
    background-color: white;
}

.tables-container {
    display: flex;
    justify-content: space-around;
    margin: 20px 0;
    flex-wrap: wrap;
    gap: 20px;
}

.table-vis {
    border: 2px solid var(--primary);
    border-radius: var(--border-radius);
    padding: 15px;
    min-width: 200px;
    background-color: white;
}

.table-vis h4 {
    text-align: center;
    color: var(--primary);
    margin-bottom: 15px;
}

.table-row {
    display: flex;
    border-bottom: 1px solid var(--gray);
    padding: 8px 0;
}

.table-row:last-child {
    border-bottom: none;
}

.table-cell {
    flex: 1;
    padding: 0 5px;
}

.key-cell {
    font-weight: bold;
    color: var(--primary-dark);
}

.join-controls {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin: 20px 0;
}

.result-vis {
    margin-top: 20px;
    border: 2px solid var(--info);
    border-radius: var(--border-radius);
    padding: 15px;
    background-color: white;
}

.highlight {
    background-color: rgba(255, 88, 174, 0.2);
    transition: background-color 0.5s ease;
}

.join-visual {
    text-align: center;
    margin: 20px 0;
}

.join-visual img {
    max-width: 100%;
    height: auto;
    border: 1px solid var(--gray);
    border-radius: var(--border-radius);
}

.join-caption {
    font-style: italic;
    color: var(--dark);
    margin-top: 10px;
}

/* Quiz */
.quiz-question {
    margin-bottom: 30px;
    padding: 20px;
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.quiz-options {
    margin: 15px 0;
}

.quiz-option {
    display: block;
    margin: 10px 0;
    padding: 10px 15px;
    border: 1px solid var(--gray);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
}

.quiz-option:hover {
    background-color: var(--primary-light);
}

.quiz-option.selected {
    background-color: var(--primary-light);
    border-color: var(--primary);
}

.quiz-option.correct {
    background-color: rgba(76, 175, 80, 0.2);
    border-color: var(--success);
}

.quiz-option.incorrect {
    background-color: rgba(244, 67, 54, 0.2);
    border-color: var(--error);
}

.quiz-feedback {
    margin-top: 15px;
    padding: 15px;
    border-radius: var(--border-radius);
    display: none;
}

.quiz-feedback.correct {
    background-color: rgba(76, 175, 80, 0.1);
    border-left: 4px solid var(--success);
}

.quiz-feedback.incorrect {
    background-color: rgba(244, 67, 54, 0.1);
    border-left: 4px solid var(--error);
}

.quiz-results {
    padding: 20px;
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin: 30px 0;
}

.progress-bar {
    height: 10px;
    background-color: var(--gray);
    border-radius: 5px;
    margin: 10px 0;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background-color: var(--primary);
    border-radius: 5px;
    transition: width 0.5s ease;
}

.fill-in-blank {
    background-color: var(--light);
    border: 1px dashed var(--primary);
    border-radius: 4px;
    padding: 5px;
    margin: 0 5px;
    min-width: 100px;
    display: inline-block;
}

/* Footer */
footer {
    background-color: var(--dark);
    color: white;
    padding: 30px 0;
    margin-top: 50px;
    text-align: center;
}

/* Responsividade */
@media (max-width: 768px) {
    .header-container {
        flex-direction: column;
        align-items: flex-start;
    }

    .nav-toggle {
        display: block;
        position: absolute;
        right: 20px;
        top: 20px;
    }

    nav {
        width: 100%;
        display: none;
        margin-top: 15px;
    }

    nav.active {
        display: block;
    }

    nav ul {
        flex-direction: column;
    }

    nav ul li {
        margin: 5px 0;
    }

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    .cards-container {
        grid-template-columns: 1fr;
    }

    .tables-container {
        flex-direction: column;
        align-items: center;
    }

    .table-vis {
        width: 100%;
        max-width: 300px;
    }
}

/* Utilidades */
.hidden {
    display: none;
}

.text-center {
    text-align: center;
}

.mt-20 {
    margin-top: 20px;
}

.mb-20 {
    margin-bottom: 20px;
}

.alert {
    padding: 15px;
    border-radius: var(--border-radius);
    margin: 15px 0;
}

.alert-info {
    background-color: rgba(33, 150, 243, 0.1);
    border-left: 4px solid var(--info);
}

.alert-warning {
    background-color: rgba(255, 152, 0, 0.1);
    border-left: 4px solid var(--warning);
}

.alert-error {
    background-color: rgba(244, 67, 54, 0.1);
    border-left: 4px solid var(--error);
}

.tag {
    display: inline-block;
    background-color: var(--primary-light);
    color: var(--primary-dark);
    padding: 3px 8px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    margin: 0 5px 5px 0;
}