/* ==========================================================================
   Tabela de Conteúdos
   ==========================================================================
   1. Definições de Tema (Variáveis CSS)
   2. Estilos Globais e Reset
   3. Estrutura e Layout Principal
   4. Componentes (Formulários, Botões, Cards, etc.)
   5. Classes Utilitárias
   6. Media Queries (Responsividade)
   ========================================================================== */

/* ==========================================================================
   1. Definições de Tema (Variáveis CSS)
   ========================================================================== */
   :root {
    /* Cores de Ação */
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --danger-color: #dc2626;
    --danger-hover: #b91c1c;
    --warning-color: #f59e0b;
    --warning-hover: #d97706;
    --success-color: #16a34a;
    --success-hover: #15803d;
    /* Cores de Fundo */
    --background-primary: #e5e7eb;
    --background-secondary: #ffffff;
    --background-item: #f9fafb;
    --border-color: #d1d5db;
    /* Cores de Texto */
    --text-primary: #1f2937;
    --text-secondary: #4b5563;
    --white: #ffffff;
    /* Cores de Prioridade */
    --priority-red: #ef4444;
    --priority-yellow: #f59e0b;
    --priority-green: #22c55e;
    --priority-red-bg: #fecaca;
    --priority-yellow-bg: #fde68a;
    --priority-green-bg: #bbf7d0;
    /* Outros */
    --font-family: 'Poppins', sans-serif;
    --shadow-color: rgba(0, 0, 0, 0.1);
}

body.dark-mode {
    --primary-color: #6d28d9;
    --primary-hover: #5b21b6;
    --danger-color: #be123c;
    --danger-hover: #9f1239;
    --background-primary: #111827;
    --background-secondary: #1f2937;
    --background-item: #374151;
    --border-color: #4b5563;
    --text-primary: #f9fafb;
    --text-secondary: #9ca3af;
    --priority-red: #f87171;
    --priority-yellow: #fbbf24;
    --priority-green: #4ade80;
    --priority-red-bg: rgba(248, 113, 113, 0.1);
    --priority-yellow-bg: rgba(251, 191, 36, 0.1);
    --priority-green-bg: rgba(74, 222, 128, 0.1);
    --shadow-color: rgba(0, 0, 0, 0.2);
}

/* ==========================================================================
   2. Estilos Globais e Reset
   ========================================================================== */
* {
    box-sizing: border-box;
    margin: 0;
}

body {
    font-family: var(--font-family);
    background-color: var(--background-primary);
    color: var(--text-primary);
    padding: 20px;
    min-height: 100vh;
    transition: background-color 0.3s ease, color 0.3s ease;
}

body:not(.dark-mode) {
    background-image: linear-gradient(to top, #79a0eb 0%, #ffffff 100%);
    background-attachment: fixed;
}

h1, h2 {
    color: var(--text-primary);
}

a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease;
}
a:hover {
    color: var(--primary-hover);
}

/* ==========================================================================
   3. Estrutura e Layout Principal
   ========================================================================== */
/* Restaura o Flexbox no body para centralizar o container inicial */
body {
    display: flex;
    justify-content: center;
    align-items: center;
}

#auth-container {
    width: 100%;
    max-width: 450px;
    background: var(--background-secondary);
    padding: 2.5em;
    border-radius: 16px;
    box-shadow: 0 10px 15px -3px var(--shadow-color);
    border: 1px solid var(--border-color);
}

#tasks-page-container {
    display: flex;
    align-items: flex-start;
    gap: 2em;
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
}

#form-card {
    flex: 0 0 500px;
    background: var(--background-secondary);
    padding: 2.5em;
    border-radius: 16px;
    box-shadow: 0 10px 15px -3px var(--shadow-color);
    border: 1px solid var(--border-color);
    position: sticky;
    top: 2em;
}

.task-area {
    flex-grow: 1;
}

/* ==========================================================================
   4. Componentes
   ========================================================================== */

/* --- Formulários --- */
form {
    display: flex;
    flex-direction: column;
    gap: 1.2em;
}

.form-header {
    text-align: center;
    margin-bottom: 1em;
}
.form-header i {
    font-size: 4rem;
    color: var(--primary-color);
    opacity: 0.8;
}

#form-card header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1em;
    margin-bottom: 1.5em;
}

input[type="email"],
input[type="password"],
input[type="text"],
input[type="date"],
select {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1em;
    font-family: var(--font-family);
    background-color: var(--background-item);
    color: var(--text-primary);
    transition: all 0.2s ease;
}
input::placeholder { color: var(--text-secondary); }
input:focus,
select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary-color) 30%, transparent);
}

.form-row { 
    display: flex; 
    gap: 1em;
 }

p { 
    margin-top: 1em; 
    text-align: center; 
    font-size: 0.9em; 
}

/* --- Botões --- */
button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5em;
    padding: 12px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1em;
    font-weight: 500;
    font-family: var(--font-family);
    transition: background-color 0.2s ease, transform 0.1s ease;
}
button:hover { transform: translateY(-2px); }
button:active { transform: translateY(0); }

/* Botão principal do formulário */
form button[type="submit"] {
    background-color: var(--primary-color);
    color: var(--white);
}
form button[type="submit"]:hover { background-color: var(--primary-hover); }

/* Botão de Logout */
#logout-button {
    background-color: var(--danger-color);
    color: var(--white);
    padding: 8px 16px;
    font-size: 0.9em;
}
#logout-button:hover { background-color: var(--danger-hover); }

/* Botão de Tema */
#theme-toggle-button {
    position: fixed; top: 20px; right: 20px;
    background-color: var(--background-item);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    width: 45px; height: 45px;
    border-radius: 50%;
    z-index: 1000;
}

/* --- Barra de Ferramentas de Tarefas --- */
.task-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5em;
    padding-bottom: 1.5em;
    border-bottom: 1px solid var(--border-color);
}
.filter-buttons { display: flex; gap: 0.5em; }
.filter-btn {
    background-color: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    padding: 8px 16px;
}
.filter-btn:hover { background-color: var(--background-item); }
.filter-btn.active {
    background-color: var(--primary-color);
    color: var(--white);
    border-color: var(--primary-color);
}
.sort-options { display: flex; align-items: center; gap: 0.8em; }
.sort-options label { font-size: 0.9em; color: var(--text-secondary); }

/* --- Itens de Tarefa --- */
#task-list { list-style: none; padding: 0; }
.task-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.2em;
    border-radius: 12px;
    margin-bottom: 1em;
    border: 1px solid var(--border-color);
    border-left-width: 5px;
    transition: all 0.2s ease;
}
.task-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 6px -1px var(--shadow-color);
}

.task-details {
    word-break: break-word;
    margin-right: 1em;
}

.task-info {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    gap: 0.5em;
    min-width: 0; 
}

.task-item .edit-title,
.task-item .edit-desc {
    width: 100%;
    padding: 8px 10px;
    margin-bottom: 8px;
    border-radius: 6px;
    border: 2px solid var(--primary-color); /* Borda azul para indicar modo de edição */
    background-color: var(--background-secondary);
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: 1em;
}

.task-item .edit-title {
    font-weight: 500;
}

.task-item .edit-desc {
    font-size: 0.9em;
    min-height: 50px;
    resize: vertical; /* Permite que o utilizador aumente a altura */
}

/* Modificadores de Prioridade (corretos) */
.task-item.priority-verde { border-left-color: var(--priority-green); background-color: var(--priority-green-bg); }
.task-item.priority-amarela { border-left-color: var(--priority-yellow); background-color: var(--priority-yellow-bg); }
.task-item.priority-vermelha { border-left-color: var(--priority-red); background-color: var(--priority-red-bg); }

.task-info { flex-grow: 1;
    display: flex; 
    flex-direction: 
    column; gap: 0.5em;
}
.task-details 
strong { font-size: 1.1em; 
    font-weight: 500; 
}
.task-details p { margin: 0.2em 0 0; 
    color: var(--text-secondary); 
    font-size: 0.9em; 
    text-align: left; 
    overflow-wrap: break-word;
}
.due-date { font-size: 0.85em; 
    color: var(--text-secondary);
    display: flex; 
    align-items: center; 
    gap: 0.4em; 
}

.task-item.completed .task-details { 
    text-decoration: line-through;
    color: var(--text-secondary); 
}

.task-actions {
    display: flex;
    align-items: center;
    gap: 0.7em;
    flex-shrink: 0; 
}

.task-action-btn {
    padding: 8px 12px;
    font-size: 0.9em;
    color: var(--white);
    border: none;
}

/* Estilização baseada nos atributos data-action */
.task-action-btn[data-action="complete"] { background-color: var(--success-color); }
.task-action-btn[data-action="complete"]:hover { background-color: var(--success-hover); }

.task-action-btn[data-action="uncomplete"] { background-color: var(--text-secondary); }
.task-action-btn[data-action="uncomplete"]:hover { background-color: var(--text-primary); }

.task-action-btn[data-action="edit"] { background-color: var(--warning-color); }
.task-action-btn[data-action="edit"]:hover { background-color: var(--warning-hover); }

.task-action-btn[data-action="delete"] { background-color: var(--danger-color); }
.task-action-btn[data-action="delete"]:hover { background-color: var(--danger-hover); }

.task-action-btn[data-action="edit"] { background-color: var(--warning-color); }
.task-action-btn[data-action="edit"]:hover { background-color: var(--warning-hover); }

.task-action-btn[data-action="save"] { background-color: var(--primary-color); }
.task-action-btn[data-action="save"]:hover { background-color: var(--primary-hover); }

/* ==========================================================================
   5. Classes Utilitárias
   ========================================================================== */
.hidden { display: none !important; }
.message { margin-top: 1em; text-align: center; font-weight: 500; }

/* ==========================================================================
   6. Media Queries (Responsividade)
   ========================================================================== */
@media (max-width: 992px) {
    #tasks-page-container {
        flex-direction: column;
        align-items: stretch;
        padding: 1em;
    }
    #form-card {
        width: 100%;
        position: static;
    }
    .form-row {
        flex-direction: column;
        gap: 1.2em; /* Mantém um espaçamento vertical consistente */
    }

    .sidebar h2 {
        cursor: pointer;
        display: flex;
        justify-content: space-between;
        align-items: center;
    }
    .sidebar h2::after {
        content: '\f078';
        font-family: 'Font Awesome 5 Free';
        font-weight: 900;
        transition: transform 0.3s ease;
    }
    .sidebar.collapsed > form > *:not(h2) {
        display: none;
    }
    .sidebar:not(.collapsed) h2::after {
        transform: rotate(180deg);
    }
    .task-toolbar {
        flex-direction: column;
        align-items: stretch;
        gap: 1em;
    }
}