:root {
    --primary-color: #3B82F6;
    --primary-dark: #2563EB;
    --text-color: #111827;
    --text-secondary: #6B7280;
    --bg-color: #F9FAFB;
    --bg-card: #FFFFFF;
    --border-color: #E5E7EB;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --success-color: #10B981;
    --danger-color: #EF4444;
    --warning-color: #F59E0B;
    --transition: all 0.3s ease;
    --neon-glow: 0 0 10px rgba(59, 130, 246, 0.5), 0 0 20px rgba(59, 130, 246, 0.3);
    --input-bg: rgba(255, 255, 255, 0.05);
    --primary-color-rgb: 59, 130, 246;
    --border-color-rgb: 229, 231, 235;
}

.dark-theme {
    --primary-color: #0EA5E9;
    --primary-dark: #0891B2;
    --text-color: #F8FAFC;
    --text-secondary: #94A3B8;
    --bg-color: #0F172A;
    --bg-card: #1E293B;
    --border-color: #334155;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    --neon-glow: 0 0 10px rgba(14, 165, 233, 0.5), 0 0 20px rgba(14, 165, 233, 0.3);
    --input-bg: rgba(255, 255, 255, 0.05);
    --primary-color-rgb: 14, 165, 233;
    --border-color-rgb: 51, 65, 85;
}

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

body {
    font-family: 'Gilroy', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: var(--transition);
    line-height: 1.6;
}

.container {
    max-width: 1000px;
    margin: 2rem auto;
    padding: 0 1rem;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    position: relative;
    padding-bottom: 1rem;
}

.header-line {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(to right, transparent, var(--primary-color), transparent);
    box-shadow: var(--neon-glow);
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.logo {
    transition: var(--transition);
}

.app-title {
    font-size: 2.5rem;
    color: var(--primary-color);
    font-weight: 800;
    letter-spacing: -0.5px;
}

.theme-toggle-btn {
    background: rgba(255, 255, 255, 0.1);
    border: none;
    font-size: 1.2rem;
    color: var(--text-color);
    cursor: pointer;
    transition: var(--transition);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.1);
}

.theme-toggle-btn:hover {
    color: var(--primary-color);
    box-shadow: var(--neon-glow);
    transform: scale(1.05);
}

.new-task {
    display: flex;
    margin-bottom: 1.5rem;
    position: relative;
}

#task-input {
    flex: 1;
    padding: 1rem 1.2rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    background-color: var(--input-bg);
    color: var(--text-color);
    transition: var(--transition);
    font-family: 'Gilroy', sans-serif;
    backdrop-filter: blur(5px);
    box-shadow: inset 0 0 5px rgba(0, 0, 0, 0.1);
}

#task-input::placeholder {
    color: var(--text-secondary);
    animation: pulsePlaceholder 3s infinite ease-in-out;
}

@keyframes pulsePlaceholder {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 1; }
}

#task-input:focus {
    outline: none;
    box-shadow: 0 0 0 2px var(--primary-color);
    background-color: var(--input-bg);
}

#add-task-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    width: 45px;
    height: 45px;
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition);
    margin-left: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow);
}

#add-task-btn:hover {
    background-color: var(--primary-dark);
    transform: scale(1.05);
    box-shadow: var(--neon-glow);
    animation: pulse 1.5s infinite ease-in-out;
}

@keyframes pulse {
    0%, 100% { box-shadow: 0 0 5px var(--primary-color); }
    50% { box-shadow: 0 0 15px var(--primary-color), 0 0 20px var(--primary-color); }
}

.filter-container {
    display: flex;
    justify-content: space-between;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 10px;
    perspective: 1000px;
}

.filters {
    display: flex;
    gap: 0.8rem;
}

.filter-btn, #clear-completed {
    background-color: transparent;
    border: 1px solid var(--border-color);
    padding: 0.5rem 1.2rem;
    border-radius: 20px;
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-color);
    font-family: 'Gilroy', sans-serif;
    font-weight: 500;
    box-shadow: 0 0 5px rgba(var(--primary-color-rgb), 0.1);
    position: relative;
    overflow: hidden;
}

.filter-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: 20px;
    border: 1px solid transparent;
    background: linear-gradient(to right, var(--primary-color), transparent) border-box;
    -webkit-mask: linear-gradient(#fff 0 0) padding-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.filter-btn:hover::before, .filter-btn.active::before {
    opacity: 1;
}

.filter-btn:hover, #clear-completed:hover {
    background-color: rgba(var(--primary-color-rgb), 0.1);
    color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(var(--primary-color-rgb), 0.2);
}

.filter-btn.active {
    background-color: rgba(var(--primary-color-rgb), 0.15);
    color: var(--primary-color);
    box-shadow: 0 0 10px rgba(var(--primary-color-rgb), 0.3);
    font-weight: 600;
}

#clear-completed {
    color: var(--text-secondary);
    opacity: 0.8;
    font-size: 0.9rem;
    padding: 0.5rem 1rem;
    border-color: transparent;
}

#clear-completed:hover {
    opacity: 1;
    color: var(--danger-color);
    background-color: rgba(239, 68, 68, 0.1);
    box-shadow: 0 5px 15px rgba(239, 68, 68, 0.15);
}

.lists-container {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2rem;
    align-items: flex-start;
    min-height: 300px;
}

.list-column {
    background-color: var(--bg-card);
    border-radius: 12px;
    box-shadow: var(--shadow), 0 0 20px rgba(var(--primary-color-rgb), 0.05);
    padding: 1.5rem;
    min-height: 300px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    transform: translateZ(0);
    flex: 1;
    width: 100%;
}

.list-column::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: 12px;
    border: 1px solid transparent;
    background: linear-gradient(135deg, rgba(var(--primary-color-rgb), 0.3), transparent 50%) border-box;
    -webkit-mask: linear-gradient(#fff 0 0) padding-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
}

.list-column h2 {
    font-size: 1rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-color);
    text-transform: uppercase;
    letter-spacing: 2px;
    font-weight: 700;
}

.tasks-list {
    min-height: 150px;
    padding: 1rem;
    background-color: rgba(var(--border-color-rgb), 0.2);
    border-radius: 8px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    will-change: transform, background-color;
    transform: translateZ(0);
    backface-visibility: hidden;
}

.tasks-list.empty-list {
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(var(--primary-color-rgb), 0.03);
}

.tasks-list.empty-list::after {
    content: 'Arraste as tarefas aqui';
    color: var(--text-secondary);
    font-size: 0.9rem;
    opacity: 0.5;
}

/* Estilos para quando o drag está ativo */
body.dragging-active .tasks-list {
    border: 2px dashed rgba(var(--primary-color-rgb), 0.2);
}

body.dragging-active .tasks-list.potential-target {
    background-color: rgba(var(--primary-color-rgb), 0.05);
}

.tasks-list.filtering {
    opacity: 0;
    transform: translateX(-10px);
}

.tasks-list.filtered {
    opacity: 1;
    transform: translateX(0);
    transition-delay: 0.1s;
}

.tasks-list.drag-over {
    z-index: 10;
}

.task-item {
    background-color: var(--bg-card);
    border-radius: 8px;
    box-shadow: var(--shadow);
    padding: 1rem 1.2rem;
    margin-bottom: 1rem;
    transition: all 0.3s ease, transform 0.2s ease;
    position: relative;
    overflow: hidden;
    border: 1px solid transparent;
    opacity: 1;
    will-change: transform, opacity;
    transform: translateZ(0);
    animation: slideInUp 0.3s ease-out;
    backface-visibility: hidden;
    -webkit-font-smoothing: subpixel-antialiased;
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.task-item:hover {
    transform: translateY(-2px) translateZ(0);
}

.task-item.dragging {
    opacity: 0.6 !important;
    transform: scale(1.02) translateZ(0);
    z-index: 9999;
    position: relative;
    pointer-events: none;
    cursor: grabbing;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.15);
}

.task-item.dragging * {
    pointer-events: none;
}

.task-content {
    flex: 1;
    transition: var(--transition);
    overflow-wrap: break-word;
    word-break: break-word;
}

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

.task-actions {
    display: flex;
    gap: 0.5rem;
}

.task-check, .task-edit, .task-delete {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 0.9rem;
    transition: var(--transition);
    color: var(--text-secondary);
}

.task-check:hover {
    color: var(--success-color);
}

.task-edit:hover {
    color: var(--primary-color);
}

.task-delete:hover {
    color: var(--danger-color);
}

.edit-input {
    width: 100%;
    padding: 0.4rem;
    font-size: 1rem;
    border: 1px solid var(--primary-color);
    border-radius: 4px;
    background-color: var(--bg-card);
    color: var(--text-color);
    font-family: 'Gilroy', sans-serif;
}

.tasks-count {
    color: var(--text-secondary);
    font-size: 0.9rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.3rem;
    padding: 1rem 0;
    border-top: 1px solid rgba(var(--border-color-rgb), 0.3);
    margin-top: 1rem;
    letter-spacing: 0.5px;
}

#tasks-left {
    font-weight: 500;
    position: relative;
    transition: all 0.3s ease;
    opacity: 0.7;
}

#tasks-left::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    width: 100%;
    height: 1px;
    background: linear-gradient(to right, transparent, var(--primary-color), transparent);
    opacity: 0.5;
}

.task-date {
    font-size: 0.7rem;
    color: var(--text-secondary);
    position: absolute;
    top: 5px;
    right: 8px;
}

/* Status-specific styles */
.task-item[data-status="todo"] {
    border-left-color: var(--primary-color);
}

.task-item[data-status="progress"] {
    border-left-color: var(--warning-color);
}

.task-item[data-status="done"] {
    border-left-color: var(--success-color);
}

footer {
    text-align: center;
    padding: 2rem 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.highlight {
    color: var(--primary-color);
    font-weight: 600;
}

.signature {
    margin-top: 0.5rem;
    font-size: 0.8rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.2rem;
}

.footer-logo {
    display: inline-block;
    vertical-align: middle;
    color: var(--text-secondary);
    margin-right: 0.1rem;
}

/* Drag and drop indicators */
.drop-indicator {
    display: none;
}

@keyframes pulseDrop {
    0%, 100% { opacity: 0; }
    50% { opacity: 0; }
}

/* Animation for new tasks */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

.task-item {
    animation: fadeIn 0.3s ease forwards;
}

/* Utility class for filter animation */
.transition-filter {
    transition: opacity 0.3s ease, transform 0.3s ease;
}

/* Responsive design */
@media (max-width: 768px) {
    .lists-container {
        flex-direction: column;
        gap: 2rem;
    }
    
    .list-column {
        width: 100%;
        min-height: 250px;
    }
    
    .filter-container {
        flex-direction: column;
        align-items: center;
    }
    
    .filters {
        margin-bottom: 1rem;
    }
    
    .app-title {
        font-size: 2rem;
    }
    
    .container {
        margin: 1rem auto;
    }
}

/* Aparência de elemento ao ser arrastado */
body.drag-drop-ready .task-item:active {
    cursor: grabbing;
}

/* Adicionar estas regras para melhorar a performance visual */
@media (pointer: fine) {
    .task-item {
        transform: translateZ(0);
        transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    }
    
    .task-item:hover {
        transform: translateY(-2px) translateZ(0);
    }
}

/* Garantir visibilidade durante o arrasto */
body.dragging-active {
    cursor: grabbing;
}

/* Corrigir problemas de sobreposição */
.tasks-list.drag-over {
    z-index: 10;
}

/* Corrigir problemas com altura do container durante arrastos */
.lists-container {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2rem;
    align-items: flex-start;
    min-height: 300px;
}

/* Garantir transições consistentes */
.task-item[data-status="todo"],
.task-item[data-status="progress"],
.task-item[data-status="done"] {
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1), 
                transform 0.2s cubic-bezier(0.25, 0.8, 0.25, 1),
                opacity 0.3s ease;
}