/* --- 1. VARIÁVEIS DE COR E TEMA --- */

/* Modo Claro (Padrão) */
:root {
    --bg-color: #d3d3d3; /* Fundo da página mais escuro */
    --container-color: #FFFFFF; /* Container branco, mais claro */
    --text-color: #1C1B0D;
    --primary-color: #36724A;
    --primary-hover-color: #285d3a;
    --success-color: #26B11D;
    --border-color: #E0E0E0;
    --button-text-color: #FFFFFF;
    --secondary-text-color: #555;
    --edit-color: #ffc107;
    --delete-color: #dc3545;
    --shadow-color: rgba(0, 0, 0, 0.1);
}

/* Modo Escuro */
[data-theme='dark'] {
    --bg-color: #000000c8;
    --container-color: #19290f;
    --text-color: #FFFFFF;
    --primary-color: #36724A;
    --primary-hover-color: #72b187;
    --success-color: #26B11D;
    --border-color: #283628;
    --button-text-color: #FFFFFF;
    --secondary-text-color: #D1D5DB;
    --edit-color: #ffc107;
    --delete-color: #dc3545;
    --shadow-color: rgba(255, 255, 255, 0.05);
}

/* --- 2. ESTILOS GERAIS --- */

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
    transition: background-color 0.3s, color 0.3s;
}

.container {
    background-color: var(--container-color);
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 6px 15px var(--shadow-color);
    width: 100%;
    max-width: 500px;
    transition: background-color 0.3s, box-shadow 0.3s;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
}

h1 {
    color: var(--text-color);
    font-size: 1.8em;
}

/* --- 3. BOTÃO DE TEMA --- */

#theme-toggle-btn {
    background: none;
    border: 2px solid var(--border-color);
    color: var(--text-color);
    padding: 8px 12px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.2em;
    transition: background-color 0.3s, color 0.3s, border-color 0.3s;
}

#theme-toggle-btn:hover {
    background-color: var(--primary-color);
    color: var(--button-text-color);
}

/* --- 4. ÁREA DE ADIÇÃO DE TAREFAS --- */

.add-task-container {
    display: flex;
    gap: 10px;
    margin-bottom: 25px;
}

#task-input {
    flex-grow: 1;
    padding: 12px;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    font-size: 1em;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: border-color 0.3s;
}

#task-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

#add-task-btn {
    padding: 12px 20px;
    background-color: var(--primary-color);
    color: var(--button-text-color);
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.3s;
}

#add-task-btn:hover {
    background-color: var(--primary-hover-color);
}

/* --- 5. FILTROS --- */

.filters-container {
    display: flex;
    justify-content: space-around;
    margin-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
}

.filters-container button {
    background: none;
    border: none;
    color: var(--secondary-text-color);
    padding: 8px 15px;
    cursor: pointer;
    font-size: 1em;
    border-radius: 4px;
    transition: color 0.3s, border-bottom 0.3s;
    border-bottom: 2px solid transparent;
}

.filters-container button:hover {
    color: var(--primary-color);
}

.filters-container button.active {
    color: var(--primary-color);
    font-weight: bold;
    border-bottom: 2px solid var(--primary-color);
}

/* --- 6. LISTA DE TAREFAS --- */

#task-list {
    list-style: none;
}

#task-list li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
    border-bottom: 1px solid var(--border-color);
    font-size: 1.1em;
}

#task-list li:last-child {
    border-bottom: none;
}

.task-text {
    flex-grow: 1;
    margin-right: 15px;
    word-wrap: break-word;
}

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

/* --- 7. BOTÕES DE AÇÃO --- */

.actions-container button {
    background: none;
    border: none;
    cursor: pointer;
    margin-left: 10px;
    font-size: 1.2em;
    opacity: 0.8;
    transition: opacity 0.2s, color 0.2s;
}

.actions-container button:hover {
    opacity: 1;
}

.edit-btn {
    color: var(--edit-color);
}

.delete-btn {
    color: var(--delete-color);
}

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

/* --- 8. EDIÇÃO DE TAREFA --- */

.edit-input {
    flex-grow: 1;
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1em;
    margin-right: 10px;
    background-color: var(--bg-color);
    color: var(--text-color);
}

.save-edit-btn {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.2em;
    color: var(--success-color);
}

footer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 10px;
    text-align: center;
    font-size: 0.9em;
    color: var(--secondary-text-color);
}

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

footer a:hover {
    color: var(--primary-hover-color);
    text-decoration: underline;
}