/* Reset e variáveis */
:root {
    /* Cores principais */
    --primary-dark: #5d1f75;
    --primary: #dcf30f;
    --light: #f6f5fa;
    --accent: #FF6B6B;
    --secondary: #f3db52;
    
    /* Variáveis para tema claro */
    --bg-color: var(--light);
    --text-color: #333;
    --card-bg: #fff;
    --border-color: #e0e0e0;
    --column-bg: #f5f5f5;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --hover-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    
    /* Tamanhos e espaçamentos */
    --border-radius: 8px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    
    /* Transições */
    --transition-speed: 0.3s;
}

/* Tema escuro */
body.dark-theme {
    --bg-color: #222;
    --text-color: #f0f0f0;
    --card-bg: #333;
    --border-color: #444;
    --column-bg: #2a2a2a;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    --hover-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color var(--transition-speed), color var(--transition-speed);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Cabeçalho */
header {
    background-color: var(--primary-dark);
    color: white;
    padding: var(--spacing-md);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 10;
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.header-actions {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

/* Botões */
button {
    cursor: pointer;
    border: none;
    border-radius: var(--border-radius);
    font-weight: 500;
    transition: all var(--transition-speed);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.primary-btn {
    background-color: var(--primary);
    color: var(--primary-dark);
    padding: 8px 16px;
}

.primary-btn:hover {
    background-color: #3dbdb5;
    transform: translateY(-2px);
}

.secondary-btn {
    background-color: transparent;
    color: white;
    padding: 8px 16px;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

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

#theme-toggle {
    background-color: transparent;
    color: white;
    font-size: 1.2rem;
    width: 40px;
    height: 40px;
    border-radius: 50%;
}

#theme-toggle:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

/* Área principal */
main {
    flex: 1;
    padding: var(--spacing-md);
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

/* Quadro Kanban */
.kanban-board {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    height: calc(100vh - 180px);
}

.column {
    background-color: var(--column-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    transition: box-shadow var(--transition-speed);
    min-height: 200px;
}

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

.task-counter {
    background-color: var(--primary);
    color: white;
    border-radius: 50%;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: bold;
}

.tasks-container {
    padding: var(--spacing-md);
    flex: 1;
    overflow-y: auto;
    min-height: 100px;
}

/* Cartões de tarefas */
.task-card {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow);
    cursor: grab;
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
    position: relative;
    animation: fadeIn 0.3s ease-in-out;
}

.task-card:hover {
    box-shadow: var(--hover-shadow);
    transform: translateY(-2px);
}

.task-card.dragging {
    opacity: 0.5;
    transform: scale(0.95);
}

.task-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-sm);
}

.task-title {
    font-weight: bold;
    word-break: break-word;
    padding-right: var(--spacing-md);
}

.task-description {
    font-size: 0.9rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-color);
    opacity: 0.8;
    word-break: break-word;
}

.task-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    margin-top: var(--spacing-sm);
}

.task-due-date {
    display: flex;
    align-items: center;
    gap: 4px;
}

.task-due-date.expired {
    color: var(--accent);
    font-weight: bold;
}

.task-actions {
    display: flex;
    gap: 6px;
}

.task-action-btn {
    background: transparent;
    color: var(--text-color);
    opacity: 0.6;
    width: 30px;
    height: 30px;
    border-radius: 50%;
}

.task-action-btn:hover {
    background-color: rgba(0, 0, 0, 0.05);
    opacity: 1;
}

.task-priority {
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    border-top-left-radius: var(--border-radius);
    border-bottom-left-radius: var(--border-radius);
}

.priority-low {
    background-color: var(--primary);
}

.priority-medium {
    background-color: var(--secondary);
}

.priority-high {
    background-color: var(--accent);
}

/* Modais */
.modal {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.9);
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    width: 90%;
    max-width: 500px;
    z-index: 100;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-speed);
}

.modal.active {
    opacity: 1;
    visibility: visible;
    transform: translate(-50%, -50%) scale(1);
}

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

.close-btn {
    background: transparent;
    color: var(--text-color);
    font-size: 1.2rem;
    width: 32px;
    height: 32px;
    border-radius: 50%;
}

.close-btn:hover {
    background-color: rgba(0, 0, 0, 0.05);
}

.modal-content {
    max-height: 80vh;
    overflow-y: auto;
}

.overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 50;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-speed);
}

.overlay.active {
    opacity: 1;
    visibility: visible;
}

/* Formulários */
form {
    padding: var(--spacing-md);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
}

input, textarea, select {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: inherit;
}

textarea {
    resize: vertical;
    min-height: 100px;
}

.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.checkbox-group {
    display: flex;
    gap: var(--spacing-md);
}

.checkbox-group label {
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
}

/* Rodapé */
footer {
    background-color: var(--primary-dark);
    color: white;
    text-align: center;
    padding: var(--spacing-md);
    margin-top: auto;
}

footer a {
    color: var(--secondary);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

/* Animações */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes shake {
    0%, 100% {
        transform: translateX(0);
    }
    10%, 30%, 50%, 70%, 90% {
        transform: translateX(-5px);
    }
    20%, 40%, 60%, 80% {
        transform: translateX(5px);
    }
}

.shake {
    animation: shake 0.5s ease-in-out;
}

/* Placeholder para área de soltar */
.drop-placeholder {
    background-color: rgba(78, 205, 196, 0.2);
    border: 2px dashed var(--primary);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-md);
    height: 80px;
}

/* Responsividade */
@media (max-width: 768px) {
    .header-container {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .header-actions {
        width: 100%;
        justify-content: space-between;
    }
    
    .kanban-board {
        grid-template-columns: 1fr;
        height: auto;
    }
    
    .column {
        margin-bottom: var(--spacing-md);
        height: auto;
        min-height: 300px;
    }
    
    .tasks-container {
        max-height: none;
    }
    
    .modal {
        width: 95%;
    }
    
    #add-task-btn span {
        display: none;
    }
}

/* Estilo para notificação de tarefa vencida */
.task-notification {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background-color: var(--accent);
    color: white;
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    z-index: 20;
    max-width: 300px;
    animation: slideIn 0.3s forwards;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* Estilo para área de drop */
.drop-zone {
    border: 2px dashed var(--primary);
    background-color: rgba(78, 205, 196, 0.1);
}