/* Reset e variáveis */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Cores do tema escuro com toques quentes */
    --bg-primary: #121212; /* Fundo principal quase preto */
    --bg-secondary: #1e1e1e; /* Fundo para elementos secundários */
    --bg-card: linear-gradient(145deg, #2a2a2a, #1a1a1a); /* Gradiente sutil para cards */
    --text-primary: #f0f0f0; /* Texto principal claro */
    --text-secondary: #b0b0b0; /* Texto secundário */
    --accent-color: #ff6b6b; /* Cor de destaque quente (vermelho coral) */
    --accent-hover: #ff8e8e; /* Hover da cor de destaque */
    --border-color: #3a3a3a;
    --shadow: 0 8px 30px rgba(0, 0, 0, 0.5);
    --radius: 12px; /* Bordas mais arredondadas */
    --spacing-unit: 20px;
    --transition-speed: 0.4s cubic-bezier(0.25, 0.8, 0.25, 1); /* Transição suave e elegante */
}

/* Rolagem suave */
html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: stretch;
    overflow-x: hidden; /* Evita rolagem horizontal indesejada */
}

/* Container principal */
.app-container {
    width: 100%;
    max-width: 1400px; /* Um pouco mais largo */
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    position: relative; /* Para posicionar elementos absolutos */
}

/* Cabeçalho Fixo */
.app-header {
    background: rgba(30, 30, 30, 0.95); /* Fundo semi-transparente */
    backdrop-filter: blur(10px); /* Efeito de desfoque no fundo */
    border-bottom: 1px solid var(--border-color);
    padding: calc(var(--spacing-unit) / 2) var(--spacing-unit);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0,0,0,0.2);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-unit);
    flex-wrap: wrap; /* Quebra em telas pequenas */
}

.app-title {
    font-size: 1.8rem;
    margin: 0;
    background: linear-gradient(to right, var(--accent-color), #ffd166); /* Gradiente no título */
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 800; /* Negrito mais forte */
}

/* Barra de Busca Principal */
.main-search-container {
    display: flex;
    flex: 1;
    max-width: 600px;
    position: relative;
}

#main-search-bar {
    width: 100%;
    padding: 12px 50px 12px 15px; /* Espaço para o botão */
    border: 1px solid var(--border-color);
    border-radius: 50px; /* Formato arredondado */
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 1rem;
    transition: all var(--transition-speed);
}

#main-search-bar:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(255, 107, 107, 0.2);
    background-color: var(--bg-primary);
}

.search-btn {
    position: absolute;
    right: 5px;
    top: 50%;
    transform: translateY(-50%);
    background-color: var(--accent-color);
    color: white;
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: background-color var(--transition-speed);
}

.search-btn:hover {
    background-color: var(--accent-hover);
}

/* Botão de Filtros */
.filters-toggle {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--text-primary);
    transition: all var(--transition-speed);
    flex-shrink: 0; /* Impede que o botão encolha */
}

.filters-toggle:hover {
    background-color: var(--bg-secondary);
    border-color: var(--accent-color);
    color: var(--accent-color);
    transform: scale(1.05);
}

/* Painel de Filtros (Lateral) */
.filters-panel {
    position: fixed;
    top: 0;
    right: 0;
    width: 100%;
    max-width: 350px;
    height: 100vh;
    background-color: var(--bg-secondary);
    border-left: 1px solid var(--border-color);
    transform: translateX(100%);
    transition: transform var(--transition-speed);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow);
}

.filters-panel.active {
    transform: translateX(0);
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-unit);
    border-bottom: 1px solid var(--border-color);
}

.panel-header h2 {
    margin: 0;
    font-size: 1.5rem;
    color: var(--accent-color);
}

.close-btn {
    background: none;
    border: none;
    font-size: 2rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: color var(--transition-speed);
    width: 40px;
    height: 40px;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 50%;
}

.close-btn:hover {
    color: var(--accent-color);
    background-color: rgba(255, 255, 255, 0.1);
}

.panel-content {
    padding: var(--spacing-unit);
    overflow-y: auto;
    flex: 1;
}

.filter-group {
    margin-bottom: calc(var(--spacing-unit) * 1.5);
}

.filter-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-secondary);
}

.filter-group select, .filter-group input {
    width: 100%;
    padding: 10px 15px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-size: 1rem;
    cursor: pointer;
    transition: border-color var(--transition-speed);
}

.filter-group select:focus, .filter-group input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px rgba(255, 107, 107, 0.2);
}

.alphabet-index {
    display: grid;
    grid-template-columns: repeat(5, 1fr); /* 5 colunas */
    gap: 8px;
}

.alphabet-index button {
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 10px 0;
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.2s ease;
    font-size: 0.9rem;
    font-weight: 500;
}

.alphabet-index button:hover,
.alphabet-index button.active {
    background-color: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
    transform: translateY(-2px);
}

/* Overlay */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-speed), visibility 0s var(--transition-speed);
}

.overlay.active {
    opacity: 1;
    visibility: visible;
    transition: opacity var(--transition-speed);
}

/* Main Content */
.main-content {
    flex: 1;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); /* Grid responsivo */
    gap: calc(var(--spacing-unit) * 1.5);
    padding: calc(var(--spacing-unit) * 1.5);
    padding-top: calc(var(--spacing-unit) * 2); /* Espaço para o header fixo */
}

/* Card de Receita - Estilo aprimorado */
.recipe-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: calc(var(--spacing-unit) * 1.2);
    box-shadow: var(--shadow);
    transition: all var(--transition-speed);
    display: flex;
    flex-direction: column;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.recipe-card::before { /* Efeito de brilho ao passar o mouse */
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.5s;
}

.recipe-card:hover::before {
    left: 100%;
}

.recipe-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.6);
    border-color: var(--accent-color);
}

.recipe-card h2 {
    color: var(--accent-color);
    margin-bottom: 12px;
    font-size: 1.4rem;
    font-weight: 700;
}

.recipe-card .recipe-meta {
    display: flex;
    justify-content: space-between;
    margin-bottom: 15px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.recipe-card .recipe-preview {
    margin-bottom: 15px;
    color: var(--text-primary);
    flex-grow: 1; /* Faz o preview crescer para preencher espaço */
}

/* Botão de Detalhes */
.btn-details {
    align-self: flex-start; /* Alinha à esquerda */
    padding: 8px 16px;
    background-color: transparent;
    color: var(--accent-color);
    border: 1px solid var(--accent-color);
    text-decoration: none;
    border-radius: 50px; /* Botão arredondado */
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-speed);
    font-size: 0.9rem;
}

.btn-details:hover {
    background-color: var(--accent-color);
    color: white;
    transform: scale(1.05);
}

/* Detalhes da Receita */
.recipe-detail {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: calc(var(--spacing-unit) * 2);
    box-shadow: var(--shadow);
    grid-column: 1 / -1; /* Ocupa toda a largura do grid */
    margin-top: calc(var(--spacing-unit) * 1.5);
}

.recipe-detail h1 {
    color: var(--accent-color);
    margin-bottom: 20px;
    font-size: 2rem;
    text-align: center;
}

.recipe-detail .recipe-meta-detail {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: calc(var(--spacing-unit) / 2);
    margin-bottom: 30px;
    font-size: 1rem;
    color: var(--text-secondary);
}

.recipe-detail .recipe-meta-detail span {
    background-color: var(--bg-secondary);
    padding: 5px 12px;
    border-radius: 20px;
    border: 1px solid var(--border-color);
}

.recipe-detail h2 {
    color: var(--accent-color);
    margin-top: 30px;
    margin-bottom: 15px;
    font-size: 1.5rem;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
}

.recipe-detail ul, .recipe-detail ol {
    padding-left: 20px;
    margin-bottom: 20px;
}

.recipe-detail li {
    margin-bottom: 10px;
    line-height: 1.7;
}

.recipe-detail .btn-back {
    display: inline-block;
    padding: 12px 25px;
    background-color: var(--accent-color);
    color: white;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    margin-top: 20px;
    transition: background-color var(--transition-speed), transform 0.2s ease;
    font-size: 1rem;
    text-align: center;
}

.recipe-detail .btn-back:hover {
    background-color: var(--accent-hover);
    transform: scale(1.03);
}

/* Loading & No Results */
.loading, .no-results {
    text-align: center;
    padding: 60px 20px;
    font-size: 1.2rem;
    color: var(--text-secondary);
    grid-column: 1 / -1;
}

/* Footer */
.app-footer {
    text-align: center;
    padding: calc(var(--spacing-unit) * 1.5);
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.9rem;
    background-color: var(--bg-secondary);
}

/* Responsividade */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        align-items: stretch;
    }
    .main-search-container {
        max-width: none;
        order: 3; /* Move a busca para baixo */
    }
    .app-title {
        text-align: center;
        order: 1;
    }
    .filters-toggle {
        align-self: center;
        order: 2;
        margin: 10px 0;
    }
    .main-content {
        grid-template-columns: 1fr; /* Uma coluna em móveis */
        padding: var(--spacing-unit);
        padding-top: calc(var(--spacing-unit) * 2);
    }
    .recipe-detail {
        padding: var(--spacing-unit);
    }
    .recipe-detail h1 {
        font-size: 1.7rem;
    }
    .filters-panel {
        max-width: 100%;
    }
}

@media (max-width: 480px) {
    .alphabet-index {
        grid-template-columns: repeat(4, 1fr); /* 4 colunas em telas muito pequenas */
    }
    .app-title {
        font-size: 1.5rem;
    }
}