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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #0f2027 0%, #203a43 50%, #2c5364 100%);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    color: #ffffff;
    padding: 20px;
}

.todo-header {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 30px;
    width: 100%;
    max-width: 800px;
}

.back-btn {
    background: rgba(255, 255, 255, 0.1);
    color: #00c6ff;
    padding: 10px 15px;
    border-radius: 8px;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
}

.back-btn:hover {
    background: #00c6ff;
    color: #0f2027;
    transform: translateX(-5px);
}

.todo-header h1 {
    font-size: 2rem;
    flex: 1;
}

.todo-container {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
    width: 100%;
    max-width: 800px;
}

/* Input Section */
.input-section {
    margin-bottom: 30px;
}

.input-group {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
    flex-wrap: wrap;
}

.task-input,
.priority-select,
.due-date-input {
    padding: 12px 15px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    color: #ffffff;
    font-size: 1rem;
    transition: all 0.3s ease;
    font-family: inherit;
}

.task-input {
    flex: 1;
    min-width: 200px;
}

.task-input::placeholder {
    color: rgba(255, 255, 255, 0.5);
}

.task-input:focus,
.priority-select:focus,
.due-date-input:focus {
    outline: none;
    background: rgba(255, 255, 255, 0.1);
    border-color: #00c6ff;
    box-shadow: 0 0 10px rgba(0, 198, 255, 0.3);
}

.priority-select,
.due-date-input {
    min-width: 120px;
}

.add-btn {
    padding: 12px 20px;
    background: linear-gradient(135deg, #00c6ff, #00a8cc);
    color: #0f2027;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: bold;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(0, 198, 255, 0.3);
}

.add-btn:hover {
    box-shadow: 0 8px 25px rgba(0, 198, 255, 0.5);
    transform: translateY(-2px);
}

/* Filter Section */
.filter-section {
    display: flex;
    gap: 15px;
    align-items: center;
    flex-wrap: wrap;
}

.search-input {
    flex: 1;
    min-width: 200px;
    padding: 10px 15px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    color: #ffffff;
    transition: all 0.3s ease;
}

.search-input::placeholder {
    color: rgba(255, 255, 255, 0.5);
}

.search-input:focus {
    outline: none;
    background: rgba(255, 255, 255, 0.1);
    border-color: #00c6ff;
}

.filter-buttons {
    display: flex;
    gap: 8px;
}

.filter-btn {
    padding: 8px 15px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    color: rgba(255, 255, 255, 0.7);
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.9rem;
}

.filter-btn:hover,
.filter-btn.active {
    background: rgba(0, 198, 255, 0.3);
    border-color: #00c6ff;
    color: #00c6ff;
}

/* Stats */
.stats-box {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
    margin-bottom: 25px;
    background: rgba(0, 198, 255, 0.1);
    padding: 15px;
    border-radius: 10px;
    border: 1px solid rgba(0, 198, 255, 0.2);
}

.stat {
    text-align: center;
}

.stat-label {
    display: block;
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.85rem;
    text-transform: uppercase;
}

.stat-value {
    display: block;
    font-size: 1.8rem;
    font-weight: bold;
    color: #00c6ff;
}

/* Tasks Container */
.tasks-container {
    min-height: 300px;
    margin-bottom: 15px;
    position: relative;
}

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

.task-list li {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 15px;
    margin-bottom: 10px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    gap: 15px;
    transition: all 0.3s ease;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.task-list li:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
}

.task-list li.completed {
    opacity: 0.6;
}

.task-list li.completed .task-text {
    text-decoration: line-through;
    color: rgba(255, 255, 255, 0.5);
}

.checkbox-wrapper {
    display: flex;
    align-items: center;
}

.checkbox-wrapper input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: #00c6ff;
}

.task-content {
    flex: 1;
}

.task-text {
    font-size: 1rem;
    margin-bottom: 5px;
}

.task-meta {
    display: flex;
    gap: 10px;
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.6);
    flex-wrap: wrap;
}

.priority-badge {
    padding: 2px 8px;
    border-radius: 5px;
    font-size: 0.75rem;
    font-weight: bold;
    text-transform: uppercase;
}

.priority-badge.high {
    background: rgba(255, 107, 107, 0.3);
    color: #ff9999;
}

.priority-badge.medium {
    background: rgba(255, 200, 87, 0.3);
    color: #ffc857;
}

.priority-badge.low {
    background: rgba(76, 175, 80, 0.3);
    color: #81c784;
}

.due-date {
    color: rgba(255, 255, 255, 0.6);
}

.task-actions {
    display: flex;
    gap: 10px;
}

.task-btn {
    padding: 6px 10px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 5px;
    color: rgba(255, 255, 255, 0.8);
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 5px;
    font-size: 0.85rem;
}

.task-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

.task-btn.delete-btn:hover {
    background: rgba(255, 107, 107, 0.3);
    color: #ff9999;
}

.empty-state {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: rgba(255, 255, 255, 0.5);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 10px;
    display: block;
}

.empty-state p {
    font-size: 1.1rem;
}

/* Clear Completed Button */
.clear-completed-btn {
    width: 100%;
    padding: 12px;
    background: rgba(255, 107, 107, 0.2);
    color: #ff9999;
    border: 1px solid rgba(255, 107, 107, 0.5);
    border-radius: 8px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.clear-completed-btn:hover {
    background: rgba(255, 107, 107, 0.4);
}

/* Responsive */
@media (max-width: 600px) {
    .todo-header {
        flex-direction: column;
        text-align: center;
        align-items: flex-start;
        margin-bottom: 20px;
    }

    .todo-header h1 {
        font-size: 1.5rem;
    }

    .input-group {
        flex-direction: column;
    }

    .task-input,
    .priority-select,
    .due-date-input,
    .add-btn {
        width: 100%;
    }

    .filter-section {
        flex-direction: column;
    }

    .search-input {
        width: 100%;
    }

    .filter-buttons {
        width: 100%;
        justify-content: space-around;
    }

    .stats-box {
        grid-template-columns: 1fr;
    }

    .task-list li {
        flex-direction: column;
        align-items: flex-start;
    }

    .task-actions {
        width: 100%;
    }
}