/*
 * E-AI Frontend Design System
 * Arquivo: layout.css
 *
 * Objetivo:
 * Definir estruturas reutilizáveis de página, containers, seções,
 * grids e utilitários simples de layout.
 *
 * Dependência:
 * Deve ser carregado após tokens.css e components.css.
 */

/* Base de página */

.eai-page {
    min-height: 100vh;
    background-color: var(--eai-color-background);
    color: var(--eai-color-text);
    font-family: var(--eai-font-family-base);
    line-height: var(--eai-line-height-base);
}

.eai-page-header {
    padding: var(--eai-space-8) 0 var(--eai-space-6);
}

.eai-page-title {
    margin: 0 0 var(--eai-space-2);
    color: var(--eai-color-text);
    font-family: var(--eai-font-family-heading);
    font-size: var(--eai-font-size-2xl);
    font-weight: var(--eai-font-weight-bold);
    line-height: var(--eai-line-height-heading);
}

.eai-page-subtitle {
    max-width: 760px;
    margin: 0;
    color: var(--eai-color-text-muted);
    font-size: var(--eai-font-size-md);
}

/* Containers */

.eai-container {
    width: min(100% - 2rem, var(--eai-container-lg));
    margin-right: auto;
    margin-left: auto;
}

.eai-container-sm {
    width: min(100% - 2rem, var(--eai-container-sm));
    margin-right: auto;
    margin-left: auto;
}

.eai-container-md {
    width: min(100% - 2rem, var(--eai-container-md));
    margin-right: auto;
    margin-left: auto;
}

.eai-container-xl {
    width: min(100% - 2rem, var(--eai-container-xl));
    margin-right: auto;
    margin-left: auto;
}

/* Seções */

.eai-section {
    padding: var(--eai-space-8) 0;
}

.eai-section-sm {
    padding: var(--eai-space-5) 0;
}

.eai-section-title {
    margin: 0 0 var(--eai-space-3);
    color: var(--eai-color-text);
    font-family: var(--eai-font-family-heading);
    font-size: var(--eai-font-size-xl);
    font-weight: var(--eai-font-weight-bold);
    line-height: var(--eai-line-height-heading);
}

.eai-section-description {
    margin: 0 0 var(--eai-space-5);
    color: var(--eai-color-text-muted);
    font-size: var(--eai-font-size-md);
}

/* Grids */

.eai-grid {
    display: grid;
    gap: var(--eai-space-5);
}

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

.eai-grid-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.eai-grid-4 {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.eai-grid-auto {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

/* Stacks */

.eai-stack {
    display: flex;
    flex-direction: column;
    gap: var(--eai-space-4);
}

.eai-stack-sm {
    display: flex;
    flex-direction: column;
    gap: var(--eai-space-2);
}

.eai-stack-lg {
    display: flex;
    flex-direction: column;
    gap: var(--eai-space-6);
}

.eai-inline {
    display: flex;
    align-items: center;
    gap: var(--eai-space-3);
    flex-wrap: wrap;
}

.eai-inline-between {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--eai-space-4);
    flex-wrap: wrap;
}

/* Header reutilizável */

.eai-app-header {
    position: sticky;
    top: 0;
    z-index: var(--eai-z-sticky);
    border-bottom: 1px solid var(--eai-color-border);
    background-color: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(10px);
}

.eai-app-header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--eai-space-4);
    min-height: 64px;
}

.eai-app-brand {
    display: inline-flex;
    align-items: center;
    gap: var(--eai-space-3);
    color: var(--eai-color-text);
    font-family: var(--eai-font-family-heading);
    font-size: var(--eai-font-size-lg);
    font-weight: var(--eai-font-weight-bold);
    text-decoration: none;
}

.eai-app-brand:hover {
    color: var(--eai-color-primary);
    text-decoration: none;
}

.eai-app-nav {
    display: flex;
    align-items: center;
    gap: var(--eai-space-3);
    flex-wrap: wrap;
}

/* Áreas de conteúdo */

.eai-content {
    padding: var(--eai-space-6) 0;
}

.eai-panel {
    padding: var(--eai-space-5);
    border: 1px solid var(--eai-color-border);
    border-radius: var(--eai-radius-lg);
    background-color: var(--eai-color-surface);
    box-shadow: var(--eai-shadow-sm);
}

.eai-sidebar-layout {
    display: grid;
    grid-template-columns: 280px minmax(0, 1fr);
    gap: var(--eai-space-6);
    align-items: start;
}

.eai-sidebar {
    position: sticky;
    top: calc(64px + var(--eai-space-4));
}

.eai-main {
    min-width: 0;
}

/* Utilitários */

.eai-text-muted {
    color: var(--eai-color-text-muted);
}

.eai-text-primary {
    color: var(--eai-color-primary);
}

.eai-bg-surface {
    background-color: var(--eai-color-surface);
}

.eai-bg-muted {
    background-color: var(--eai-color-surface-muted);
}

.eai-divider {
    width: 100%;
    height: 1px;
    margin: var(--eai-space-5) 0;
    background-color: var(--eai-color-border);
}

.eai-sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    white-space: nowrap;
    border: 0;
    clip: rect(0, 0, 0, 0);
}

/* Responsividade */

@media (max-width: 992px) {
    .eai-grid-4 {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .eai-grid-3 {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .eai-sidebar-layout {
        grid-template-columns: 1fr;
    }

    .eai-sidebar {
        position: static;
    }
}

@media (max-width: 768px) {
    .eai-page-header {
        padding: var(--eai-space-6) 0 var(--eai-space-4);
    }

    .eai-page-title {
        font-size: var(--eai-font-size-xl);
    }

    .eai-grid-2,
    .eai-grid-3,
    .eai-grid-4 {
        grid-template-columns: 1fr;
    }

    .eai-app-header-inner {
        align-items: flex-start;
        flex-direction: column;
        padding: var(--eai-space-3) 0;
    }

    .eai-inline-between {
        align-items: flex-start;
        flex-direction: column;
    }
}