/*
|--------------------------------------------------------------------------
| SISTEMA DE DESIGN (CUSTOM PROPERTIES / VARIÁVEIS CSS)
|--------------------------------------------------------------------------
*/

:root {
    /* Cores (Paleta de 8 Cores) - Tema: Azul e Laranja */
    --color-primary-dark: #004d99; /* Azul Escuro */
    --color-primary: #007bff; /* Azul Principal */
    --color-primary-light: #66b0ff; /* Azul Claro */
    --color-secondary: #ff9900; /* Laranja/Âmbar (Acento) */
    --color-neutral-dark: #333; /* Texto Escuro */
    --color-neutral: #666; /* Texto Secundário */
    --color-neutral-light: #f4f4f4; /* Fundo Claro */
    --color-white: #fff; /* Branco */

    /* Tipografia (5 Tamanhos) */
    --font-size-xs: 0.75rem; /* 12px - Small/Help */
    --font-size-sm: 0.875rem; /* 14px - Body */
    --font-size-md: 1rem; /* 16px - Padrão */
    --font-size-lg: 1.5rem; /* 24px - Títulos */
    --font-size-xl: 2.5rem; /* 40px - Título Principal */

    /* Espaçamento Modular (8px, 16px, 24px, 32px, 48px, 64px) */
    --space-xs: 8px;
    --space-sm: 16px;
    --space-md: 24px;
    --space-lg: 32px;
    --space-xl: 48px;
    --space-xxl: 64px;

    /* Raio de Borda e Sombras */
    --border-radius: 4px;
    --box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);

    /* Max Width da Página */
    --max-width: 1200px;
}

/*
|--------------------------------------------------------------------------
| CONFIGURAÇÕES GLOBAIS / RESET
|--------------------------------------------------------------------------
*/

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    color: var(--color-neutral-dark);
    background-color: var(--color-white);
}

main {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--space-lg) var(--space-sm);
    min-height: 80vh; /* Para garantir o footer embaixo */
}

/*
|--------------------------------------------------------------------------
| TIPOGRAFIA E TÍTULOS
|--------------------------------------------------------------------------
*/

h1, h2, h3 {
    margin-bottom: var(--space-sm);
    line-height: 1.2;
    color: var(--color-primary-dark);
}

h1 {
    font-size: var(--font-size-xl);
    margin-top: var(--space-sm);
}

h2 {
    font-size: var(--font-size-lg);
}

h3 {
    font-size: var(--font-size-md);
}

p {
    margin-bottom: var(--space-sm);
    font-size: var(--font-size-sm);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover, a:focus {
    color: var(--color-secondary);
    text-decoration: underline;
}

.sr-only { /* Acessibilidade: esconder visualmente, mas manter para leitores de tela */
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/*
|--------------------------------------------------------------------------
| LAYOUT PRINCIPAL (HEADER/FOOTER)
|--------------------------------------------------------------------------
*/

header {
    background-color: var(--color-primary-dark);
    color: var(--color-white);
    padding: var(--space-sm) var(--space-md);
    display: flex; /* Flexbox para alinhar Brand e Nav */
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 1000;
}

header .brand img {
    max-height: 40px;
    width: auto;
}

/* Navegação Principal - Menu Desktop (Flexbox) */
nav ul {
    list-style: none;
    display: flex;
    gap: var(--space-md);
}

nav a {
    color: var(--color-white);
    text-transform: uppercase;
    font-size: var(--font-size-sm);
    padding: var(--space-xs);
    border-radius: var(--border-radius);
}

nav a:hover, nav a:focus {
    color: var(--color-secondary);
    background-color: rgba(255, 255, 255, 0.1);
    text-decoration: none;
}

/* Footer (Flexbox) */
footer {
    background-color: var(--color-neutral-dark);
    color: var(--color-white);
    text-align: center;
    padding: var(--space-sm) var(--space-md);
    margin-top: var(--space-lg);
}

footer a {
    color: var(--color-secondary);
}

/*
|--------------------------------------------------------------------------
| BOTÕES (COMPONENTES)
|--------------------------------------------------------------------------
*/

.button {
    display: inline-block;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
    cursor: pointer;
    text-align: center;
    border: 2px solid transparent;
    transition: all 0.3s ease;
    text-decoration: none;
}

.button.primary {
    background-color: var(--color-secondary);
    color: var(--color-white);
}

.button.primary:hover, .button.primary:focus {
    background-color: #ffb433; /* Tom mais claro de secondary */
    box-shadow: 0 0 0 2px var(--color-white), 0 0 0 4px var(--color-secondary);
    text-decoration: none;
}

.button.large {
    padding: var(--space-sm) var(--space-lg);
    font-size: var(--font-size-md);
}

/*
|--------------------------------------------------------------------------
| LAYOUT DA PÁGINA INICIAL (GRID)
|--------------------------------------------------------------------------
*/

.index-page section, .index-page aside {
    margin-bottom: var(--space-lg);
    padding: var(--space-md);
    border-radius: var(--border-radius);
    background-color: var(--color-neutral-light);
}

.index-page img {
    width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    margin-bottom: var(--space-sm);
}

/*
|--------------------------------------------------------------------------
| LAYOUT DE PROJETOS (CARDS - GRID)
|--------------------------------------------------------------------------
*/

.project-grid {
    display: grid;
    gap: var(--space-lg);
    margin-top: var(--space-lg);
}

.project-card {
    background-color: var(--color-white);
    box-shadow: var(--box-shadow);
    padding: var(--space-md);
    border-radius: var(--border-radius);
    border-top: 5px solid var(--color-primary); /* Detalhe visual */
}

.project-card figure img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: var(--border-radius);
    margin-bottom: var(--space-xs);
}

.project-card figcaption {
    font-size: var(--font-size-xs);
    color: var(--color-neutral);
    margin-bottom: var(--space-sm);
}

/*
|--------------------------------------------------------------------------
| FORMULÁRIOS ESTILIZADOS
|--------------------------------------------------------------------------
*/

form fieldset {
    border: 1px solid var(--color-neutral);
    padding: var(--space-sm);
    margin-bottom: var(--space-lg);
    border-radius: var(--border-radius);
}

form legend {
    font-size: var(--font-size-md);
    font-weight: bold;
    color: var(--color-primary-dark);
    padding: 0 var(--space-xs);
}

form label {
    display: block;
    margin-top: var(--space-sm);
    margin-bottom: var(--space-xs);
    font-size: var(--font-size-sm);
    font-weight: bold;
}

form input[type="text"],
form input[type="email"],
form input[type="tel"],
form input[type="date"],
form select {
    width: 100%;
    padding: var(--space-xs);
    font-size: var(--font-size-md);
    border: 1px solid var(--color-neutral);
    border-radius: var(--border-radius);
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

form input:focus,
form select:focus {
    border-color: var(--color-primary);
    outline: none;
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.25);
}

/* Validação Visual nativa */
form input:invalid:not(:focus):not(:placeholder-shown) {
    border-color: #dc3545; /* Vermelho */
    box-shadow: 0 0 0 3px rgba(220, 53, 69, 0.25);
}

form input:valid:not(:focus):not(:placeholder-shown) {
    border-color: #28a745; /* Verde */
}

.help-text {
    font-size: var(--font-size-xs);
    color: var(--color-neutral);
    display: block;
    margin-bottom: var(--space-xs);
}

/* Grid do Formulário (Mobile-First 1 Coluna) */
.form-grid {
    display: grid;
    gap: var(--space-sm);
}

/*
|--------------------------------------------------------------------------
| NAVEGAÇÃO MOBILE (MENU HAMBÚRGUER)
|--------------------------------------------------------------------------
*/

.menu-toggle {
    display: block; /* Visível por padrão no mobile */
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-xs);
    z-index: 1001;
}

.menu-toggle .icon-bar {
    display: block;
    width: 25px;
    height: 3px;
    margin: 5px 0;
    background-color: var(--color-white);
    border-radius: 2px;
    transition: all 0.3s ease;
}

nav#main-navigation {
    position: fixed;
    top: 60px; /* Altura do header */
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--color-primary-dark);
    transform: translateX(100%); /* Escondido por padrão */
    transition: transform 0.3s ease-in-out;
}

nav#main-navigation.is-open {
    transform: translateX(0); /* Menu Aberto */
}

nav#main-navigation ul {
    flex-direction: column;
    padding: var(--space-md);
    gap: var(--space-sm);
}

nav#main-navigation a {
    display: block;
    font-size: var(--font-size-lg);
    text-align: center;
    padding: var(--space-sm);
}

/* Efeito X no Hambúrguer */
.menu-toggle[aria-expanded="true"] .icon-bar:nth-child(2) {
    opacity: 0;
}
.menu-toggle[aria-expanded="true"] .icon-bar:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}
.menu-toggle[aria-expanded="true"] .icon-bar:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}


/*
|--------------------------------------------------------------------------
| COMPONENTES DE FEEDBACK (Alerts) - ATIVIDADE 3
|--------------------------------------------------------------------------
*/

.alert-message {
    padding: var(--space-sm);
    margin-bottom: var(--space-sm);
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
    list-style: none;
}

.alert-message p {
    margin-bottom: var(--space-xs);
    font-weight: bold;
}

.alert-message ul {
    list-style: disc;
    margin-left: var(--space-lg);
    font-size: var(--font-size-sm);
}

.alert-message.error {
    background-color: #f8d7da; /* Fundo Vermelho Claro */
    color: #721c24; /* Texto Vermelho Escuro */
    border: 1px solid #f5c6cb;
}

.alert-message.success {
    background-color: #d4edda; /* Fundo Verde Claro */
    color: #155724; /* Texto Verde Escuro */
    border: 1px solid #c3e6cb;
}


/*
|--------------------------------------------------------------------------
| BREAKPOINTS RESPONSIVOS
|--------------------------------------------------------------------------
| Mobile-First - Breakpoints: 576px, 768px, 992px, 1200px (Cinco com 0)
*/

/* Small Devices (Mínimo 576px) */
@media (min-width: 576px) {
    .form-grid {
        grid-template-columns: 1fr 1fr; /* Duas colunas para formulário */
    }
    /* Adaptação de campos para 2 colunas */
    .form-grid #nome, .form-grid label[for="nome"],
    .form-grid #end, .form-grid label[for="end"] {
        grid-column: span 2;
    }
}

/* Medium Devices (Mínimo 768px) */
@media (min-width: 768px) {
    h1 {
        font-size: 3rem;
    }
    .project-grid {
        grid-template-columns: 1fr 1fr; /* Grid de 2 colunas para projetos */
    }
    .index-page {
        display: grid; /* Grid para a página inicial */
        grid-template-columns: 2fr 1fr;
        gap: var(--space-lg);
    }
    /* Ajusta a Missão para a linha de cima e Impacto/Contato para a linha de baixo */
    .index-page section[aria-labelledby="sobre"] {
        grid-column: 1 / 3; 
    }
    .index-page section[aria-labelledby="impacto"] {
        grid-column: 1 / 2;
    }
    .index-page aside[aria-labelledby="contato"] {
        grid-column: 2 / 3;
    }
}

/* Large Devices (Mínimo 992px) */
@media (min-width: 992px) {
    /* Esconde o botão do menu no desktop */
    .menu-toggle {
        display: none;
    }
    /* Menu Desktop */
    nav#main-navigation {
        position: static;
        transform: translateX(0);
        height: auto;
        width: auto;
        background: none;
    }
    nav#main-navigation ul {
        flex-direction: row;
        padding: 0;
    }
    nav#main-navigation a {
        font-size: var(--font-size-sm);
        padding: var(--space-xs);
    }
    .project-grid {
        grid-template-columns: repeat(3, 1fr); /* Grid de 3 colunas para projetos */
    }
    .form-grid {
        grid-template-columns: 1fr 1fr 1fr; /* Grid de 3 colunas para formulário */
    }
    /* Adaptação de campos para 3 colunas */
    .form-grid #nome, .form-grid label[for="nome"],
    .form-grid #end, .form-grid label[for="end"] {
        grid-column: span 3; 
    }
}

/* Extra Large Devices (Mínimo 1200px) */
@media (min-width: 1200px) {
    .project-grid {
        grid-template-columns: repeat(4, 1fr); /* Grid de 4 colunas para projetos */
    }
    main {
        padding: var(--space-lg) 0; /* Remove padding lateral em telas muito grandes */
    }
}